WO2012014539A1 - Solar cell module and solar power generation device - Google Patents

Abstract

A solar cell module is equipped with a light guide body which has a first main surface, a second main surface, and a first end surface that is in contact with the first and second main surfaces and in which light from the outside is allowed to enter through at least the first main surface to propagate the light through the inside of the light guide body and is ejected from a part of the first end surface. The solar cell module is additionally equipped with a solar cell element which can receive light ejected from the part of the first end surface of the light guide body. On at least the side of the second main surface of the light guide body, a reflective surface on which light entered through the first main surface is reflected to alter the direction of the travelling of the light and a permeable surface through which the light entered through the first main surface is permeated and is ejected toward the outside are provided.

Description

Solar cell module and solar power generation device

The present invention relates to a solar cell module and a solar power generation device.
This application claims priority based on Japanese Patent Application No. 2010-167208 filed in Japan on July 26, 2010, the contents of which are incorporated herein by reference.

Conventional solar power generation apparatuses generally have a form in which a plurality of solar cell panels are spread over the entire surface facing the sun. As an example, a solar power generation apparatus in which a gantry is installed on the roof of a building and a plurality of solar battery panels are spread on the gantry is known. In general, a solar cell panel is made of an opaque semiconductor and cannot be stacked. Therefore, in a solar power generation device, a large-area solar cell panel is required to ensure the amount of power.
However, there is a restriction that the photovoltaic power generation apparatus must be installed in a limited place such as a roof, and there is a limit to the amount of power that can be obtained.

Therefore, a “window surface solar cell power generation system” in which a solar cell is installed in a window portion that occupies a large area in a building has been proposed (see Patent Document 1 below). This window surface solar cell power generation system includes an absorption-light-emitting plate and a solar cell in which phosphors are dispersed, and the window frame is formed by attaching the solar cell to a side surface perpendicular to the light-receiving surface of the absorption-light-emitting plate. It is configured. In this window solar cell power generation system, the internal phosphor is excited by sunlight incident on the light absorption-light emitting plate, and the solar cell is irradiated with radiation light from the phosphor to generate power.

In addition, a solar cell provided with a condensing member for guiding incident sunlight to the solar cell has been proposed (see Patent Documents 2 to 4 below).
The solar cell described in Patent Document 2 includes a wedge-shaped condensing member having an incident surface and a scattering surface inclined with respect to the incident surface, and the solar cell is attached to an end surface of the condensing member.
The solar cell described in Patent Document 3 is also substantially the same as that described in Patent Document 2, and includes a translucent member having a substantially right-sided side shape, and the solar cell is attached to the end surface of the translucent member.
The solar cell described in Patent Document 4 includes a light guide plate having a curved surface shape with continuous front and back surfaces and a mirror provided on the back surface of the light guide plate, and the solar cells are installed on two end surfaces of the light guide plate. ing. Patent Document 4 also describes that a Fresnel prism is provided in front of the light guide plate.

Japanese Utility Model Publication No. 61-136559 JP 7-122771 A JP 2004-47752 A Japanese Patent Laid-Open No. 11-46008

However, in the case of the window solar cell power generation system described in Patent Document 1, since an absorption-light-emitting plate in which a phosphor is dispersed is used, in addition to an increase in manufacturing cost, the absorption-light-emitting plate is colored, There exists a problem that the function as a transparent window falls. In addition, when light repeatedly undergoes total reflection inside the light-absorbing plate, there is a problem in that power generation efficiency decreases because light is irradiated to the phosphor many times.

Further, in the solar cells described in Patent Documents 2 to 4, the light collecting member has a wedge shape or a curved surface shape, so that it is not convenient to use as a window by attaching it to an existing window frame, for example. Further, the solar cells described in Patent Documents 2 and 4 cannot be used as a transparent window because one surface of the light collecting member is a scattering surface or a mirror. Further, in the solar cells described in Patent Documents 2 and 3, since light is guided to the solar cell on the end face using a wedge-shaped light collecting member, the light collecting efficiency is extremely reduced when the light collecting member is enlarged in area. It is difficult to cope with large area.

The present invention has been made in order to solve the above-described problems, and can achieve both transparency and power generation efficiency, a solar cell module having an inexpensive and simple configuration, and a solar cell using the solar cell module. The purpose is to provide a photovoltaic device.

(1) In order to achieve the above object, a solar cell module according to an aspect of the present invention includes a first main surface, a second main surface, the first main surface, and a first end surface in contact with the second main surface. A light guide that causes light from the outside to enter from at least the first main surface, propagate inside, and exit from a part of the first end surface, and a part of the first end surface of the light guide A solar cell element that receives light emitted from the light guide body, reflects light incident from the first main surface to at least the second main surface side of the light guide, and changes a traveling direction of the light. A reflection surface to be changed and a transmission surface that transmits light incident from the first main surface and emits the light to the outside are provided.

(2) In the solar cell module according to one aspect of the present invention, the light traveling direction is changed by reflecting light incident from the first main surface on a part of the light guide on the second main surface side. A light traveling direction changing portion is provided, and the light traveling direction changing portion is inclined so as to form a predetermined inclination angle with respect to the second main surface of the light guide, and is incident from the first main surface. A first inclined surface that constitutes the reflecting surface that reflects light, and the second main surface of the light guide so as to form an inclination angle smaller than an inclination angle of the first inclined surface; And a second inclined surface that constitutes the transmission surface that transmits light incident from one main surface.

(3) In the solar cell module according to one aspect of the present invention, the light travel direction changing unit is convex toward the far side from the solar cell element when viewed from the normal direction of the second main surface of the light guide. You may have the curved planar shape curved so that it may become.

(4) In the solar cell module according to one aspect of the present invention, the light travel direction changing unit includes a plurality of structures including a plurality of structures having the first inclined surface and the second inclined surface. The other structure group may not be located between one structure group and the solar cell element.

(5) In the solar cell module according to one aspect of the present invention, the light travel direction changing unit is provided in a light travel direction changing member separate from the light guide, and the light travel direction changing member is the light guide. It may be arranged on the second main surface side of the body.

(6) In the solar cell module according to an aspect of the present invention, the light that reflects the light incident from the second main surface on the first main surface side of the light guide and changes the traveling direction of the light. There may be provided a surface and a transmission surface that transmits light incident from the second main surface and emits the light to the outside.

(7) In the solar cell module according to one aspect of the present invention, the reflection surface on the first main surface side of the light guide and the reflection surface on the second main surface side of the light guide You may arrange | position in a different position seeing from the normal line direction of 1 main surface and the said 2nd main surface.

(8) In the solar cell module according to one aspect of the present invention, a protection member that protects the reflective surface via an air layer is provided on at least the second main surface side of the light guide provided with the reflective surface. May be.

(9) In the solar cell module according to one aspect of the present invention, a plurality of the light guides may be stacked in a posture in which the first main surface and the second main surface of the light guide are substantially parallel. good.

(10) In the solar cell module according to one aspect of the present invention, the two light guides provided with the reflection surface on the second main surface side are stacked in a direction in which the second main surfaces face each other. May be.

(11) In the solar cell module according to one aspect of the present invention, the plurality of reflection surfaces of the plurality of light guides are viewed from a normal direction of the first main surface and the second main surface of the light guide. May be arranged at different positions.

(12) In the solar cell module according to one embodiment of the present invention, the light guide may have a function of absorbing or reflecting infrared light.

(13) A solar power generation device according to another aspect of the present invention includes a first main surface, a second main surface, a first end surface in contact with the first main surface, and the second main surface. A light guide that makes light enter at least from the first main surface, propagates inside, and exits from a part of the first end surface, and receives light emitted from a part of the first end surface of the light guide A reflective surface that reflects light incident from the first main surface to at least the second main surface side of the light guide, and changes a traveling direction of the light, and A solar cell module provided with a transmission surface that transmits light incident from the first main surface and emits the light to the outside.

According to the present invention, it is possible to provide a solar cell module that can achieve both transparency and power generation efficiency at a low cost and has a simple configuration, and a solar power generation apparatus using the solar cell module.

It is a perspective view which shows the solar power generation device and solar cell module of the 1st Embodiment of this invention. It is a top view of the solar cell module of the 1st Embodiment of this invention. It is sectional drawing of the solar cell module of the 1st Embodiment of this invention. It is a figure for demonstrating the effect | action of the reflective surface in the solar cell module of the 1st Embodiment of this invention. It is sectional drawing which shows the 1st modification of the solar cell module of the 1st Embodiment of this invention. It is sectional drawing which shows the 2nd modification of the solar cell module of the 1st Embodiment of this invention. It is sectional drawing which shows the 3rd modification of the solar cell module of the 1st Embodiment of this invention. It is sectional drawing which shows the 4th modification of the solar cell module of the 1st Embodiment of this invention. It is a top view which shows the solar cell module of the 2nd Embodiment of this invention. It is a top view of the solar cell module of the 3rd Embodiment of this invention. It is sectional drawing of the solar cell module of the 4th Embodiment of this invention. It is sectional drawing of the solar cell module of the 5th Embodiment of this invention. It is sectional drawing which shows the 1st modification of the solar cell module of the 5th Embodiment of this invention. It is sectional drawing of the solar cell module of the 6th Embodiment of this invention. It is sectional drawing of the solar cell module of the 7th Embodiment of this invention. It is sectional drawing which shows the 1st modification of the solar cell module of the 7th Embodiment of this invention. It is sectional drawing which shows the 2nd modification of the solar cell module of the 7th Embodiment of this invention. It is sectional drawing which shows the 3rd modification of the solar cell module of the 7th Embodiment of this invention.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, an example of a solar power generation apparatus in which a solar cell module is incorporated in a window frame will be given.
FIG. 1 is a perspective view illustrating a schematic configuration of the solar power generation device and the solar cell module of the present embodiment. FIG. 2 is a plan view showing a portion of the solar cell module taken out. FIG. 3 is a cross-sectional view of the solar cell module taken along line AA ′ of FIG. FIG. 4 is a diagram for explaining the action of the reflecting surface in the solar cell module.
It should be noted that in all of the following drawings, in order to make each component easy to see, the scale of dimensions may be different depending on the component.

The solar power generation device 1 of the present embodiment includes a solar cell module 2 and a window frame 3 as shown in FIG. A window frame 3 is attached so as to surround the four sides of the solar cell module 2 having a substantially rectangular planar shape. A solar power generation device installed on the roof of a building is conventionally known. In the case of this embodiment, for example, by incorporating this solar power generation device 1 into a window of a building, sunlight from the sun S is incorporated into the window. Photovoltaic power generation is performed when L is irradiated. In addition to the solar cell module 2 and the window frame 3, the solar power generation device 1 may include, for example, a storage battery that stores electric power obtained from the solar cell module 2. Moreover, the solar power generation device 1 is good also as a form which can be incorporated not only in the window of a building but in the window of a motor vehicle, for example.

The solar cell module 2 includes a light guide plate 4 (light guide) and a solar cell element 6 as shown in FIG. In this solar cell module 2, light taken from the light guide plate 4 is guided to the solar cell element 6, photoelectrically converted in the solar cell element 6, and taken out as electric energy. As will be described later, the light guide plate 4 is formed of a transparent plate having a rectangular shape in which the light traveling direction changing portion 7 is formed on one surface. As shown in FIG. 1, the light traveling direction is changed. The surface opposite to the surface on which the portion 7 is formed is a surface on which the light L is incident. Therefore, when installing the solar power generation device 1 in, for example, a window of a building, the surface of the light guide plate 4 on which the light traveling direction changing unit 7 is formed is the indoor side, and the side opposite to the surface on which the light traveling direction changing unit 7 is formed. Install with the side facing the outdoor side.

As a constituent material of the light guide plate 4, for example, highly transparent organic materials or inorganic materials such as acrylic resin, polycarbonate resin, and glass can be used, but are not limited thereto. The light guide plate 4 has a function as a window in addition to a function of propagating incident light therein and guiding it to the solar cell element 6. Therefore, in order to reduce the loss of light propagating through the inside as much as possible and to ensure translucency as a window, the light guide plate 4 does not include a phosphor or the like and is made of a highly transparent material. desirable. However, if the phosphor is not intentionally dispersed for the purpose of wavelength conversion inside the light guide plate 4, it may be a light guide plate made of a material that contains some phosphor and is not completely transparent. It can be used in this embodiment.

Hereinafter, for convenience of explanation, among the six surfaces of the light guide plate 4, a surface on which light is incident (a surface parallel to the xy plane in FIG. 1) is referred to as a first main surface 4 a. The surface facing the first main surface 4a and provided with the light traveling direction changing portion 7 is referred to as a second main surface 4b. A surface intersecting the first main surface 4a and the second main surface 4b and emitting light (a surface parallel to the xz plane in FIG. 1) is referred to as a first end surface 4c.

As shown in FIG. 2, the light guide plate 4 and the solar cell element 6 are disposed adjacent to each other so that a part of the first end surface 4 c of the light guide plate 4 and the light receiving surface 6 a of the solar cell element 6 face each other. Yes. The light guide plate 4 and the solar cell element 6 may be directly fixed by an optical adhesive or the like, or are not directly fixed, and the position is fixed by being accommodated in the window frame 3. Also good. In the example of FIG. 2, the solar cell element 6 is installed at the approximate center of the first end surface 4 c of the light guide plate 4, that is, the approximate center of one side extending in the short direction of the light guide plate 4 (x-axis direction in FIG. 2). Yes. The installation position of the solar cell element 6 is not limited to this position, and may be the end of the first end face 4c of the light guide plate 4, for example. Alternatively, the solar cell element 6 may be installed on one side extending in the longitudinal direction of the light guide plate 4 (y-axis direction in FIG. 2). However, when the installation position of the solar cell element 6 is changed, the planar shape of the ridge constituting the light traveling direction changing unit 7 described later is also changed accordingly.

In the case of this embodiment, the light guide plate 4 is formed of acrylic resin as an example. Furthermore, it is desirable to disperse infrared absorbers such as aluminum nitride fine particles in the acrylic resin. Thereby, an infrared absorber can remove infrared light by absorbing the infrared light component of the sunlight taken in by the light-guide plate 4, and can suppress an indoor temperature rise. The dimensions of the light guide plate 4 are, for example, the dimension of one side of the rectangular short direction (the x-axis direction in FIG. 2) serving as the first main surface 4a and the second main surface 4b is 1 m, and the longitudinal direction ( The dimension of one side of the y-axis direction in FIG. 2 is 2 m, and the thickness (dimension in the z-axis direction in FIG. 2) is 10 mm.

As shown in FIGS. 2 and 3, the second main surface 4 b of the light guide plate 4 reflects the light L 1, L 2, L 3, L 4 incident from the first main surface 4 a to change the traveling direction of the light to the first main surface 4 b. A light traveling direction changing unit 7 that changes in a direction toward the center of the end face 4c (lights L11, L12, and L13) is provided. The light traveling direction changing portion 7 is composed of a plurality of triangular prism-shaped ridges 10 formed on the second main surface 4 b of the light guide plate 4. Each ridge 10 has a curved planar shape that is curved so as to be convex from the first end surface 4c side to the second end surface 4d side when viewed from the normal direction of the second main surface 4b. ing. The planar shape of each ridge 10 is, for example, a part of a circumference having a certain curvature, and the center of curvature of each circumference is preferably located on the light receiving surface 6 a of the solar cell element 6. Since each protrusion 10 has such a planar shape, as shown in FIG. 2, the solar cell element 6 near the center of the first end face 4c is arranged for light incident from various places on the first main surface 4a. The light propagates through the light guide plate 4 so as to be focused on the spot.

In the case of the present embodiment, the light traveling direction changing unit 7 is formed integrally with the light guide plate 4 by processing the light guide plate 4 itself. The light traveling direction changing portion 7 can be formed, for example, by cutting the second main surface 4b of the originally flat light guide plate 4. Or you may form the light advancing direction change part 7 by methods, such as performing injection molding of resin using the metal mold | die which has the concave shape which reversed the shape of the protruding item | line 10. FIG.

The plurality of ridges 10 are formed apart from each other. Moreover, as shown in FIG. 3, among the 2nd main surface 4b of the light-guide plate 4, the area | region between two adjacent protruding strips becomes a flat surface F, ie, a surface parallel to the 1st main surface 4a. . In other words, the portion of the flat surface F between the two adjacent ridges is a region other than the light traveling direction changing portion 7, and a transmission surface that transmits the light incident from the first main surface 4a and emits it to the outside. Function as. 1 to 3, the shape and size of each ridge 10 and the interval (pitch) between adjacent ridges 10 are all drawn the same. Thus, the shape and size of each ridge 10 and the interval (pitch) between adjacent ridges 10 may all be the same or different.

Each ridge 10 has been described as having a triangular prism shape, but as shown in FIG. 3, the cross-sectional shape of each ridge 10 when the light guide plate 4 is cut along a plane along the yz plane, which is the longitudinal direction thereof, It is not an equilateral triangle or an isosceles triangle, but an unequal triangle. That is, each protrusion 10 constituting the light traveling direction changing unit 7 has a first inclined surface T1 and a second inclined surface T2. The first inclined surface T1 forms a predetermined inclination angle θA (see FIG. 4) with respect to the second main surface 4b. The second inclined surface T2 forms an inclination angle θB (see FIG. 4) smaller than the inclination angle θA of the first inclined surface T1 with respect to the second main surface 4b. Of these two inclined surfaces T1, T2, the first inclined surface T1 functions as a reflecting surface that reflects (totally reflects) light incident from the first main surface 4a. The second inclined surface T2 functions as a transmission surface that transmits light incident from the first main surface 4a.

As shown in FIG. 4, if sunlight L is incident on the first main surface 4a of the light guide plate 4 at an incident angle θ0, the sunlight L is refracted at the refraction angle θ1 on the first main surface 4a. The light enters the light guide plate 4. Thereafter, the light incident on the first inclined surface T1 at the incident angle θ2 is totally reflected at the reflection angle θ2, and propagates through the light guide plate 4 at an angle θ4 with respect to the virtual plane X parallel to the first main surface 4a. Injected toward the element 6. On the other hand, the light incident on the second inclined surface T2 at the incident angle θ3 is refracted at the second inclined surface T2 and emitted to the outside of the light guide plate 4. Here, the incident angle θ2 of the light on the first inclined surface T1 changes according to the inclination angle θA of the first inclined surface T1. Therefore, the inclination angle θA of the first inclined surface T1 is such that the incident angle θ2 of the light incident on the first inclined surface T1 is equal to or greater than the critical angle at the interface between the first inclined surface T1 and air and the light is totally reflected. Is set in advance. Further, the incident angle θ3 of the light to the second inclined surface T2 changes according to the inclined angle θB of the second inclined surface T2. Therefore, the inclination angle θB of the second inclined surface T2 is set so that the incident angle θ3 of the light incident on the second inclined surface T2 is less than the critical angle at the interface between the second inclined surface T2 and air and the light is transmitted. Set in advance.

Specifically, as an example, the inclination angle θA of the first inclined surface T1 is 24 degrees, the inclination angle θB of the second inclined surface T2 is 5 degrees, the refractive index of the light guide plate 4 is 1.5, The refractive index is 1.0. In this case, according to Snell's law, the critical angle at the interface between the first inclined surface T1 or the second inclined surface T2 and the air is 41 degrees. Here, if the incident angle θ0 of the sunlight L to the first main surface 4a of the light guide plate 4 is 27 degrees or more, the refraction angle θ1 when the sunlight L enters the light guide plate 4 is 18 degrees or more. It becomes. Then, the incident angle θ2 of the light on the first inclined surface T1 is 41 degrees or more, and the incident angle θ2 is not less than the critical angle, so that the light L is totally reflected by the first inclined surface T1. On the other hand, the incident angle θ3 of the light on the second inclined surface T2 is 13 degrees or more, and the incident angle θ3 is less than the critical angle, so that the light passes through the second inclined surface T2. Therefore, within the incident angle range of sunlight L that enters the light guide plate 4 when the solar power generation device 1 is installed on the window, the light is totally reflected by the first inclined surface T1, and the second inclined surface T2 is reflected. The inclination angle θA of the first inclined surface T1 and the inclination angle θB of the second inclined surface T2 may be set so as to satisfy the angle condition for transmission.

In summary, as shown in FIG. 3, the light L1 incident on the first inclined surface T1 of the ridge 10 out of the light L1, L2, L3, and L4 incident on each part of the light guide plate 4 is the first inclined surface. As described above, the light L3 that is totally reflected at T1 and enters the second inclined surface T2 of the ridge 10 passes through the second inclined surface T2. Further, light L2 and L4 incident on the flat surface F between two adjacent ridges 10 are transmitted through the flat surface F. That is, in this embodiment, the 1st inclined surface T1 of the protruding item | line 10 which comprises the light advancing direction change part 7 turns into a reflective surface which changes the advancing direction of light to the direction which goes to the 1st end surface 4c. Further, the flat surface F other than the second inclined surface T2 of the ridge 10 and the light traveling direction changing portion 7 is a transmission surface that transmits light to the outside. Therefore, a part of the light incident on the light guide plate 4 from the first main surface 4 a is guided to the solar cell element 6 and contributes to power generation, while the rest is emitted from the light guide plate 4. Thereby, for example, when the user views the light guide plate 4 from the second main surface 4b side (for example, indoor side), the light guide plate 4 appears to be substantially transparent and is on the first main surface 4a side (for example, outdoor side). Can be seen through. In the present specification, the term “transparent” is not limited to a state in which what is on the back side from the near side across the light guide plate 4 is completely seen through, but also includes a state in which what is on the back side can be recognized. It is a concept.

As the solar cell element 6, a known one can be used, and for example, an amorphous silicon solar cell, a polycrystalline silicon solar cell, a single crystal silicon solar cell, or the like can be used. The shape and size of the solar cell element 6 are not particularly limited as long as the shape and size are within the first end face 4 c of the light guide plate 4.

In the solar power generation device 1 of the present embodiment, a transparent plate that does not include a phosphor is used as the light guide plate 4 that receives sunlight L, and the light guide plate 4 reflects light to travel the light. A reflecting surface that changes the light intensity and a transmitting surface that transmits light. Therefore, the transparency of the light guide plate 4 can be ensured, and it can be used as a transparent window by being incorporated in a window of a building or an automobile. In addition, since the light collected from various parts of the light guide plate 4 is converged and guided to the solar cell element 6, the light can be sufficiently collected and the power generation efficiency can be improved. Moreover, since a parallel plate body can be used as the light guide plate 4 and a wedge-shaped plate body is not used as in the prior art, it is easy to use as a window. Moreover, the solar cell element 6 having a size corresponding to a part of the first end face 4c of the light guide plate 4 may be used, and it is not necessary to prepare a large-sized solar cell element. Therefore, the manufacturing cost can be reduced and it is easy to cope with an increase in the size of the solar cell module.

Here, in order to verify the effect of the photovoltaic power generation apparatus 1 of the present embodiment, the present inventor performed a simulation of the power generation amount. As described above, the dimensions of the first main surface 4a and the second main surface 4b of the light guide plate 4 are 1 m × 2 m, the thickness of the light guide plate 4 is 10 mm, and the inclination angle θA of the first inclined surface T1 of the light guide plate 4 is set. Was set to 24 degrees. Further, the inclination angle θB of the second inclined surface T2 was set to 5 degrees, and the projected area ratio of the first inclined surface T1 and the second inclined surface T2 of the light guide plate 4 to the first main surface 4a was set to 1/20 or less. Moreover, the dimension of the solar cell element 6 was 10 mm × 10 mm, the refractive index of the light guide plate 4 was 1.5, and the refractive index of air was 1.0. The amount of power generated when the solar cell module 2 was irradiated with sunlight from the first main surface 4a side of the light guide plate 4 was approximately 20W.

The output condition of the solar cell element 6 is based on the air mass AM1.5 defined by JIS. At this time, the incident angle of sunlight on the first main surface 4a of the light guide plate 4 is approximately 42 degrees. Become. On the other hand, the power generation amount obtained when the solar cell element 6 was directly irradiated with sunlight without using the light guide plate 4 was about 2 W. Thus, according to the solar power generation device 1 of the present embodiment, even if a small solar cell element 6 is used, the power generation amount is sufficiently large, for example, about 10 times that when the light guide plate 4 is not used. It was found that

Further, it was found that about 80% of infrared light having a wavelength of 800 nm can be removed by dispersing 1% by weight of aluminum nitride fine particles as an infrared absorber in the acrylic plate constituting the light guide plate 4.

In place of dispersing the infrared light absorbent in the constituent material of the light guide plate 4, for example, an infrared light reflection layer is provided on at least one of the first main surface 4a and the second main surface 4b of the light guide plate 4. It is good also as a structure provided. As the infrared light reflection layer, for example, a cholesteric liquid crystal layer or a dielectric multilayer film can be applied. By adopting this configuration, it is possible to suppress infrared light from passing through the light guide plate 4 and to suppress an increase in indoor temperature.

[First Modification of First Embodiment]
Hereinafter, a first modification of the present embodiment will be described with reference to FIG.
FIG. 5 is a cross-sectional view showing a solar cell module according to this modification.
In FIG. 5, the same components as those in FIG. 3 used in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the solar cell module 2 of the present embodiment described above, as shown in FIG. 3, a plurality of ridges 10 are formed on the second main surface 4 b of the light guide plate 4 so as to be separated from each other, and two adjacent ridges are formed. The area between 10 was a flat surface F. On the other hand, in the solar cell module 13 of this modification, as shown in FIG. 5, a plurality of ridges 10 are continuously formed on the second main surface 14 b of the light guide plate 14, and two adjacent There is no flat surface between the ridges 10. The inclination angles of the first inclined surface T1 and the second inclined surface T2 constituting each ridge 10 are the same as those in the above embodiment.

In the case of this modification, among the light incident on each part of the light guide plate 14, the light L1 incident on the first inclined surface T1 of the ridge 10 is totally reflected by the first inclined surface T1, and the second inclined of the ridge 10 Lights L2 and L3 incident on the surface T2 are transmitted through the second inclined surface T2. That is, the first inclined surface T1 of the ridge 10 constituting the light traveling direction changing unit 15 changes the traveling direction of the light L1 to the direction toward the first end surface 14c (lights L21, L22, L23) and Become. Moreover, the 2nd inclined surface T2 of the protruding item | line 10 becomes a permeation | transmission surface which permeate | transmits light L2, L3 outside.

[Second Modification of First Embodiment]
Hereinafter, a second modification of the present embodiment will be described with reference to FIG.
FIG. 6 is a cross-sectional view showing a solar cell module according to this modification.
In FIG. 6, the same components as those in FIG. 3 used in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the solar cell module 2 of the present embodiment described above, as shown in FIG. 3, a plurality of ridges 10 are formed on the second main surface 4 b of the light guide plate 4 so as to be separated from each other, and two adjacent ridges are formed. The area between 10 was a flat surface F. On the other hand, in the solar cell module 17 of this modification, as shown in FIG. 6, the plurality of grooves 19 are formed on the second main surface 18 b of the light guide plate 18 at a predetermined interval. The region between two adjacent grooves 19 is a flat surface F. The cross-sectional shape of each groove 19 cut along the yz plane of FIG. 6 is an unequal triangle. The inclination angles of the first inclined surface T1 and the second inclined surface T2 constituting each groove 19 are the same as those in the above embodiment.

In the case of this modification, among the light L1, L2, L3, and L4 incident on each part of the light guide plate 18, the light L1 incident on the first inclined surface T1 of the groove 19 is totally reflected by the first inclined surface T1. Lights L2 and L4 incident on the second inclined surface T2 of the groove 19 are transmitted through the second inclined surface T2, and light L3 incident on the flat surface F is transmitted through the flat surface F. That is, the 1st inclined surface T1 of the groove | channel 19 which comprises the light advancing direction change part 20 turns into a reflective surface which changes the advancing direction of the light L1 to the direction (light L31, L32) which goes to the 1st end surface 18c. Further, the second inclined surface T2 and the flat surface F of the groove 19 serve as a transmission surface that transmits the light L2, L3, and L4 to the outside.

[Third Modification of First Embodiment]
Hereinafter, a third modification of the present embodiment will be described with reference to FIG.
FIG. 7 is a cross-sectional view showing a solar cell module according to this modification.
In FIG. 7, the same components as those in FIG. 3 used in the above embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the solar cell module 22 of this modification, as shown in FIG. 7, a plurality of grooves 19 are continuously formed on the second main surface 23 b of the light guide plate 23, and the flatness between two adjacent grooves 19 is flat. There are no faces. The cross-sectional shape of each groove 19 cut along the yz plane of FIG. 7 is an unequal triangle. The inclination angles of the first inclined surface T1 and the second inclined surface T2 constituting each groove 19 are the same as those in the above embodiment.

In the case of this modification, among the light L1, L2, and L3 incident on each part of the light guide plate 23, the light L1 incident on the first inclined surface T1 of the groove 19 is totally reflected by the first inclined surface T1. Further, the light beams L2 and L3 incident on the second inclined surface T2 of the groove 19 are transmitted through the second inclined surface T2. That is, the first inclined surface T1 of the groove 19 constituting the light traveling direction changing unit 24 becomes a reflecting surface that changes the traveling direction of the light L1 to the direction toward the first end surface 23c (lights L41 and L42). The second inclined surface T2 of the groove 19 serves as a transmission surface that transmits the light L2 and L3 to the outside.

[Fourth Modification of First Embodiment]
Hereinafter, a fourth modification of the present embodiment will be described with reference to FIG.
FIG. 8 is a cross-sectional view showing a solar cell module according to this modification.
In FIG. 8, the same components as those in FIG. 3 used in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the above-described ridge 10, the cross-sectional shape along the light traveling direction is all triangular, but the cross-sectional shape is not necessarily triangular. For example, as in the solar cell module 36 shown in FIG. 8, the ridge 37 having a rounded shape at each corner of the triangle may be formed on the second main surface 38 b of the light guide plate 38. In this case, the first inclined surface T3 having a relatively large inclination angle with respect to the second main surface 38b and the second inclined surface T4 having a small inclination angle are both curved surfaces, but there is no particular functional problem even if they are curved surfaces. Moreover, also about the groove | channel 19 mentioned above, a 1st inclined surface and a 2nd inclined surface may be a curved surface.

In FIG. 8, the first inclined surface T3 of the ridge 37 constituting the light traveling direction changing portion is a reflecting surface that changes the traveling direction of the light L1 to the direction toward the first end surface 38c (lights L51 and L52). . Moreover, the 2nd inclined surface T4 of the protruding item | line 37 becomes a permeation | transmission surface which permeate | transmits light outside. In addition, the light L2 and L3 incident on the first main surface 38a facing the region where the protrusions 37 of the second main surface 38b of the light guide plate 38 are not formed are transmitted through the light guide plate 38 and the second main surface. The light is emitted from 38b.

[Fifth Modification of First Embodiment]
Hereinafter, a fifth modification of the present embodiment will be described with reference to FIG.
FIG. 9 is a plan view showing a solar cell module according to this modification.
In FIG. 9, the same components as those in FIG. 2 used in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

The ridges 10 shown in FIG. 2 were continuously formed from one end to the other end of the light guide plate 4 in the short direction. On the other hand, in the solar cell module 26 of this modification, as shown in FIG. 9, each protrusion 28 constituting the light traveling direction changing portion 27 of the light guide plate 29 is divided at a plurality of locations. A portion where each projection 28 is divided is a flat surface F.

Also in the first to fifth modifications, it is possible to provide a solar cell module having a simple structure at low cost and a solar power generation apparatus using the solar cell module that can ensure both transparency and power generation efficiency. The same effect as the above embodiment can be obtained.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIG.
The basic configuration of the solar cell module of this embodiment is the same as that of the first embodiment, and only the form of the light traveling direction changing unit is different from that of the first embodiment.
FIG. 10 is a plan view showing the solar cell module of the present embodiment.
In FIG. 10, the same components as those in FIG. 2 used in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

In the solar cell module 31 of the present embodiment, as shown in FIG. 10, the light traveling direction changing unit 32 formed on the light guide plate 34 includes a ridge group 35 including a plurality of ridges 33 (structures). Have more than one. Further, no other ridge group 35 is located between one ridge group 35 and the solar cell element 6. Specifically, there is no other ridge group 35 in a region surrounded by a line segment connecting both ends in the longitudinal direction of each ridge 33 included in one ridge group 35 and the center of the solar cell element 6. .
In addition, the cross-sectional shape and size of each ridge 33, the pitch between the ridges 33, the inclination angles of the first inclined surface T1 and the second inclined surface T2, and the like are the same as in the first embodiment. Compared to the first embodiment, the amount of the reflected light is reduced by the amount of the ridge 33 on the second main surface 34b of the light guide plate 34, that is, the area occupied by the first inclined surface T1, and the proportion of the flat surface F increases. And the amount of transmitted light increases.

Also in the solar cell module 31 of the present embodiment, the above-described solar cell module that can ensure both transparency and power generation efficiency, has a low-cost and simple configuration, and a solar power generation device using the solar cell module can be provided. The same effect as the embodiment can be obtained.

In FIG. 10, for example, the light taken into the light guide plate 34 on the side close to the second end surface 34d is reflected by the first inclined surface T1 of the ridge 33 to change the traveling direction, and then the center of the first end surface 34c. Propagates a long distance toward the solar cell element 6. At this time, if there is another ridge 33 on the optical path of the reflected light, the light enters the other ridge 33 and changes the traveling direction again, and the propagation angle in the light guide plate 34 changes. Then, before the light reaches the first end surface 34c side, the light leaks to the outside from the first main surface 34a or the second main surface 34b, and power generation efficiency may be reduced. On the other hand, in the solar cell module 31 of the present embodiment, since the other ridge group 35 does not exist between one ridge group 35 and the solar cell element 6, the amount of the above-described leakage light is reduced. Power generation efficiency can be improved.

Here, the present inventor performed a simulation of the power generation amount in order to verify the effect of the solar cell module 31 of the present embodiment. The dimensions of the first main surface 34a and the second main surface 34b of the light guide plate 34 were 1 m × 2 m, and the thickness of the light guide plate 34 was 3 mm. Further, the inclination angle θA of the first inclined surface T1 of the light guide plate 34 is set to 24 degrees, the inclination angle θB of the second inclined surface T2 is set to 5 degrees, and the first inclined surface T1 and the second inclined surface T2 of the light guide plate 34 are changed. The projected area ratio with respect to the first major surface 34a was set to 1/20 or less. Moreover, the dimension of the solar cell element 6 was 10 mm × 10 mm, the refractive index of the light guide plate 34 was 1.5, and the refractive index of air was 1.0. The amount of power generated when the solar cell module 31 was irradiated with sunlight from the first main surface 34a side of the light guide plate 34 was approximately 14W.

Note that the output condition of the solar cell element 6 is based on the air mass AM1.5 defined by JIS. At this time, the incident angle of sunlight on the first main surface 34a of the light guide plate 34 is approximately 42 degrees. Become. On the other hand, the power generation amount obtained when the solar cell element 6 was directly irradiated with sunlight without using the light guide plate 34 was approximately 2 W. Thus, according to the solar cell module 31 of the present embodiment, even if the small solar cell element 6 is used, a sufficiently large power generation amount is obtained, for example, about 7 times that when the light guide plate 34 is not used. It turns out that it is obtained.

[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.
The basic configuration of the solar cell module of this embodiment is the same as that of the first embodiment, and only the configuration of the light traveling direction changing unit is different from that of the first embodiment.
FIG. 11 is a cross-sectional view showing the solar cell module of the present embodiment.
In FIG. 11, the same components as those used in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the solar cell module 2 of the first embodiment, the light traveling direction changing unit 7 is formed integrally with the light guide plate 4, whereas in the solar cell module of the present embodiment, the light traveling direction changing unit is provided. It is a member different from the light guide plate. That is, as shown in FIG. 11, in the solar cell module 40 of the present embodiment, the light guide plate 41 includes a parallel plate-like transparent plate 42 and a film 44 (light travel direction changing member) including a light travel direction changing unit 43. ) And.
On one surface of the film 44, a light traveling direction changing portion 43 composed of a plurality of ridges 45 similar to that of the first embodiment is formed. The shape and dimensions of the ridges 45 are as described in the first embodiment. The film 44 is bonded to one surface of the transparent plate 42 via an optical adhesive 46.

The film 44 is made of a light-transmitting material, and for example, acrylic resin, polypropylene resin, cycloolefin resin, polycarbonate resin, triacetyl cellulose resin, polyethylene terephthalate resin, or the like is used. The refractive index of the transparent plate 42, the refractive index of the film 44, and the refractive index of the optical adhesive 46 are desirably matched as much as possible, but may not necessarily match.

In FIG. 11, the first inclined surface T <b> 1 of the ridge 45 constituting the light traveling direction changing unit 43 is a reflecting surface that changes the traveling direction of the light L <b> 63 to the direction toward the first end surface (lights L <b> 61 and L <b> 62). . Moreover, the 2nd inclined surface T2 of the protruding item | line 45 becomes a permeation | transmission surface which permeate | transmits light outside. Further, the light L64 incident on the first main surface facing the region where the first inclined surface T1 of the light guide plate 41 is not formed is transmitted through the light guide plate 41 and emitted from the second main surface.

Also in the solar cell module 40 of the present embodiment, the above-described solar cell module that can ensure both transparency and power generation efficiency, has a low-cost and simple configuration, and a solar power generation device using the solar cell module can be provided. The same effect as the embodiment can be obtained.

In the case of the present embodiment, when the light guide plate 41 is manufactured, it is not necessary to cut the transparent plate 42 or perform injection molding using a mold, and the flat transparent plate 42 is prepared. What is necessary is just to bond the film 44 to the transparent plate 42. Alternatively, the film 44 may be attached to the window glass later. Further, the film 44 may be bonded to only a part of the window glass. Thus, according to this embodiment, a solar cell module with a high degree of freedom can be realized according to the usage pattern.

[Fourth Embodiment]
Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG.
The basic configuration of the solar cell module of the present embodiment is the same as that of the first embodiment, and is different from the first embodiment only in that the light traveling direction changing portions are provided on both surfaces of the light guide plate.
FIG. 12 is a cross-sectional view showing the solar cell module of the present embodiment.
In FIG. 12, the same components as those used in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the solar cell module 48 of the present embodiment, as shown in FIG. 12, the light traveling direction changing portions 7 are formed on both the first main surface 49a and the second main surface 49b of the light guide plate 49, respectively. That is, on the second main surface 49 b of the light guide plate 49, the light traveling direction changing portion 7 composed of a plurality of triangular prismatic ridges 10 is formed. The ridges 10 extend from one end of the light guide plate 49 to the other end while curving in a direction orthogonal to the light traveling direction of the light guide plate 49 (x-axis direction in FIG. 12). The ridge 10 has a first inclined surface T1 having a relatively large inclination angle with respect to the second main surface 49b and a second inclined surface T2 having a relatively small inclination angle with respect to the second main surface 49b. The light L71 incident on the first inclined surface T1 from the first main surface 49a side of the light guide plate 49 is totally reflected by the first inclined surface T1 and changes its traveling direction to the first end surface 49c side (lights L72 and L73). . Further, the light L75 incident on the first inclined surface T1 from the second main surface 49b side of the light guide plate 49 is totally reflected by the first inclined surface T1 and changes its traveling direction to the first end surface 49c side (light L76, L77). Further, the light L74 incident on the second inclined surface T2 from the first main surface 49a side of the light guide plate 49 is transmitted through the second inclined surface T2. The light L78 incident on the second inclined surface T2 from the second main surface 49b side of the light guide plate 49 is transmitted through the second inclined surface T2. The plurality of ridges 10 are formed so as to be separated so that the ridge lines of the triangular prisms of the ridges 10 extend in parallel to each other. A region between two adjacent ridges 10 in the second main surface 49b is a flat surface F, which functions as a transmission surface that transmits light incident from the first main surface 49a and emits the light to the outside. .

As described above, the configuration on the second main surface 49b side is the same as that of the first embodiment. In the case of the present embodiment, in addition to this, the first main surface 49a of the light guide plate 49 is also a light traveling direction changing portion 7 composed of a plurality of triangular prism-shaped ridges 10, and the second main surface 49b side and The same light traveling direction changing unit 7 is formed. In the case of this embodiment, each ridge 10 on the first main surface 49a side and each ridge 10 on the second main surface 49b side of the light guide plate 49 are the ridgeline of the ridge 10, the first inclined surface T1, and the second. The positions of the inclined surface T2 in the light traveling direction (y-axis direction in FIG. 12) of the light guide plate 49 are aligned. That is, the light travel direction changing unit 7 on the first main surface 49 a side and the light travel direction changing unit 7 on the second main surface 49 b side of the light guide plate 49 are virtual planes X passing through the center of the light guide plate 49 in the thickness direction. It has a symmetric shape around the center.

In the case of the present embodiment as well, as in the first embodiment, the light traveling direction changing unit 7 is formed integrally with the light guide plate 49 by processing the light guide plate 49 itself. The light traveling direction changing portion 7 is formed by cutting the first main surface 49a and the second main surface 49b of the light guide plate 49 that was originally flat, or a concave shape in which the shape of the ridge 10 is reversed. A resin injection molding may be performed using a mold having In addition, you may comprise a light-guide plate by the method of bonding the film 44 in which the light advancing direction change part 43 was formed on both surfaces of the transparent plate 42 like 3rd Embodiment. In FIG. 12, the shape and dimensions of the plurality of ridges 10 and the interval (pitch) between the adjacent ridges 10 are all drawn to be the same. The interval (pitch) between 10 may be different.

Also in the solar cell module 48 of the present embodiment, the above-described solar cell module that can ensure both transparency and power generation efficiency, has a low-cost and simple configuration, and a solar power generation device using the solar cell module can be provided. The same effect as the embodiment can be obtained.

Further, in the case of the first embodiment, since the light traveling direction changing portion 7 is formed only on the second main surface 4b of the light guide plate 4, only light incident from the first main surface 4a can be used for power generation. On the other hand, in the case of the present embodiment, since the light traveling direction changing portion 7 is formed on both the first main surface 49a and the second main surface 49b of the light guide plate 49, any main surface of the light guide plate 49 is formed. The light incident from can also be used for power generation. Therefore, the solar cell module 48 of the present embodiment is effective not only for use in a window frame or the like but also in a place where light enters from both sides, for example, outdoors. In addition, since the positions of the ridges 10 on the first main surface 49a side of the light guide plate 49 and the ridges 10 on the second main surface 49b side are aligned, the amount of light to be transmitted can be ensured and the transparency can be increased. Can have enough.

[Modification of Fourth Embodiment]
Hereinafter, a modification of the present embodiment will be described with reference to FIG.
FIG. 13 is a cross-sectional view showing a solar cell module according to this modification.
In FIG. 13, the same components as those in FIG. 12 used in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the solar cell module 51 of this modification, as shown in FIG. 13, the light traveling direction changing portions 7 are formed on both the first main surface 52 a and the second main surface 52 b of the light guide plate 52. This is common with the fourth embodiment. However, each ridge 10 on the first main surface 52a side of the light guide plate 52 and each ridge 10 on the second main surface 52b side are the ridgeline of the ridge 10, the first inclined surface T1, and the second inclined surface T2. Are not aligned. That is, of the first main surface 52 a and the second main surface 52 b of the light guide plate 52, each protrusion 10 on one main surface side proceeds with the light of the light guide plate 52 with respect to each protrusion 10 on the other main surface side. It is formed at a position shifted in the direction. In other words, the first inclined surface T1 on the first main surface 52a side of the light guide plate 52 and the first inclined surface T1 on the second main surface 52b side are normal lines of the first main surface 52a and the second main surface 52b. They are arranged at different positions as seen from the direction. Other configurations are the same as those of the fourth embodiment.

In FIG. 13, light L81 incident on the first inclined surface T1 from the first main surface 52a side of the light guide plate 52 is totally reflected by the first inclined surface T1 and changes its traveling direction to the first end surface 52c side (light L82, L83). The light L85 incident on the first inclined surface T1 from the second main surface 52b side of the light guide plate 52 is totally reflected by the first inclined surface T1 and changes its traveling direction to the first end surface 52c side (light L86, L87). Further, the light L84 incident on the second inclined surface T2 from the first main surface 52a side of the light guide plate 52 is transmitted through the second inclined surface T2. In addition, the light L88 incident on the second inclined surface T2 from the second main surface 52b side of the light guide plate 52 is transmitted through the second inclined surface T2.

Also in the solar cell module 51 of the present modification, it is possible to provide both a solar cell module having a low-cost and simple configuration, and a solar power generation device using the solar cell module, which can ensure both transparency and power generation efficiency. The same effect as the embodiment can be obtained. The point which can utilize the light which injected from both surfaces of the light-guide plate 52 for electric power generation is the same as that of the said embodiment.

In the case of the present embodiment, the light traveling direction changing portions 7 of the first main surface 52a and the second main surface 52b of the light guide plate 52 are formed at positions shifted from each other, for example, the first inclined surface on one main surface side. There is a position where T1 and the flat surface F on the other main surface side face each other. Therefore, compared with the said embodiment, the ratio which can take in light into the inside of the light-guide plate 52 increases, and electric power generation efficiency can be improved.

[Fifth Embodiment]
Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG.
The basic configuration of the solar cell module of the present embodiment is the same as that of the first embodiment, and only the point that a protective plate is added is different from the first embodiment.
FIG. 14 is a cross-sectional view showing the solar cell module of the present embodiment.
In FIG. 14, the same components as those used in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

The solar cell module 66 of this embodiment includes a light guide plate 4, a solar cell element 6, and a protective plate 67 (protective member) as shown in FIG. The protection plate 67 is installed so as to face the second main surface 4b of the light guide plate 4 on which the light traveling direction changing unit 7 is formed, with an air layer 68 interposed therebetween. The protection plate 67 can be formed of a transparent plate such as an acrylic resin having flat surfaces that are parallel to each other. However, the material is not particularly limited to the acrylic resin, and various materials can be used. The protection plate 67 and the light guide plate 4 can be fixed by a window frame (not shown), for example.

In FIG. 14, light L91 incident on the first inclined surface T1 from the first main surface 4a side of the light guide plate 4 is totally reflected by the first inclined surface T1 and changes its traveling direction to the first end surface 4c side (light L92, L93). Further, the light L94 incident on the second inclined surface T2 from the first main surface 4a side of the light guide plate 4 is transmitted through the second inclined surface T2. Further, the light L95 incident on the second inclined surface T2 from the second main surface 4b side of the light guide plate 4 is transmitted through the second inclined surface T2.

Also in the solar cell module 66 of the present embodiment, the above-described solar cell module that can ensure both transparency and power generation efficiency, has a low-cost and simple configuration, and a solar power generation device using the solar cell module can be provided. The same effect as the embodiment can be obtained.

Further, in the case of this embodiment, the protective plate 67 is installed so as to cover the light traveling direction changing portion 7 of the second main surface 4b of the light guide plate 4, and the light traveling direction changing portion 7 is not exposed to the outside. It can prevent that the protruding item | line 10 which comprises the light advancing direction change part 7 is damaged or missing. Furthermore, when the solar cell module 66 of this embodiment is used for a window, it is possible to realize a multi-layered window capable of photovoltaic power generation and having excellent heat insulation and the like.

[Sixth Embodiment]
Hereinafter, a sixth embodiment of the present invention will be described with reference to FIG.
The basic configuration of the solar cell module of this embodiment is the same as that of the first embodiment, and is different from the first embodiment in that two sets of solar cell modules of the first embodiment are used.
FIG. 15 is a cross-sectional view showing the solar cell module of the present embodiment.
In FIG. 15, the same components as those used in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 15, the solar cell module 70 of the present embodiment uses two sets of the solar cell modules 2 (FIGS. 2 and 3) of the first embodiment, and the two light guide plates 4 are the first ones. The main surface 4a and the second main surface 4b are stacked so as to be substantially parallel. In addition, the two light guide plates 4 are arranged via the air layer 68 so that the second main surfaces 4b on which the light traveling direction changing portions 7 including the plurality of ridges 10 are formed face each other. In the case of this embodiment, each convex strip 10 of one light guide plate 4 and each convex strip 10 of the other light guide plate 4 are guided by the ridgeline of the convex strip 10, the first inclined surface T1, and the second inclined surface T2. The positions of the light plates 4 in the light traveling direction (the y-axis direction in FIG. 15) are aligned.

In FIG. 15, light L101 incident on the first inclined surface T1 from the first main surface 4a side of the lower light guide plate 4 is totally reflected by the first inclined surface T1, and its traveling direction is directed to the first end surface 4c side. Change (light L102, L103). Further, the light L105 incident on the first inclined surface T1 from the first main surface 4a side of the upper light guide plate 4 is totally reflected by the first inclined surface T1 and changes its traveling direction to the first end surface 4c side (light). L106, L107). Further, the light L104 incident on the second inclined surface T2 from the first main surface 4a side of the lower light guide plate 4 is transmitted through the second inclined surface T2. Further, the light L108 incident on the second inclined surface T2 from the first main surface 4a side of the upper light guide plate 4 is transmitted through the second inclined surface T2.

Also in the solar cell module 70 of the present embodiment, it is possible to provide a solar cell module having a simple and inexpensive structure, and a solar power generation device using the solar cell module, which can ensure both transparency and power generation efficiency. The same effect as the embodiment can be obtained.

In the case of the present embodiment, the two light guide plates 4 are arranged so that the first main surface 4a of each light guide plate 4 faces the outside, so that light incident from both sides of the solar cell module 70 is used for power generation. be able to. Further, the two light guide plates 4 are arranged so that the plurality of ridges 10 constituting the light traveling direction changing portion 7 are opposed to each other, and the ridges 10 are not exposed to the outside. , Can prevent the chipping. Furthermore, when this solar cell module 70 is used for a window, it is possible to realize a multi-layered window capable of photovoltaic power generation and having excellent heat insulation and the like. Furthermore, since the positions of the ridges 10 of each light guide plate 4 are aligned, the amount of light to be transmitted can be secured and the transparency can be sufficiently maintained.

[First Modification of Sixth Embodiment]
Hereinafter, a first modification of the present embodiment will be described with reference to FIG.
FIG. 16 is a cross-sectional view showing a solar cell module according to this modification.
In FIG. 16, the same components as those in FIG. 15 used in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the solar cell module 72 of this modification, as shown in FIG. 16, two sets of the solar cell modules 2 (FIGS. 2 and 3) of the first embodiment are used. The two light guide plates 4 are arranged such that the first end surface 4c and the second end surface 4d on which the solar cell elements 6 are installed are opposite to each other. By adopting the arrangement, each ridge 10 of one light guide plate 4 and each ridge 10 of the other light guide plate 4 are the ridgeline of the ridge 10, the first inclined surface T1, and the second inclined surface T2. The positions of the light guide plates 4 in the light traveling direction (y-axis direction in FIG. 16) are not aligned. In other words, the first inclined surface T1 of one light guide plate 4 and the first inclined surface T1 of the other light guide plate 4 are in the normal direction of the first main surface 4a and the second main surface 4b of each light guide plate 4. They are arranged at different positions as seen from the top. Other configurations are the same as those in the above embodiment.

In FIG. 16, the light L111 incident on the first inclined surface T1 from the first main surface 4a side of the lower light guide plate 4 is totally reflected by the first inclined surface T1, and its traveling direction is directed to the first end surface 4c side. Change (light L112, L113). Further, the light L115 incident on the first inclined surface T1 from the first main surface 4a side of the upper light guide plate 4 is totally reflected by the first inclined surface T1 and changes its traveling direction to the first end surface 4c side (light L116, L117). Further, the light L114 incident on the second inclined surface T2 from the first main surface 4a side of the lower light guide plate 4 is transmitted through the second inclined surface T2. Further, the light L118 incident on the second inclined surface T2 from the first main surface 4a side of the upper light guide plate 4 is transmitted through the second inclined surface T2.

Also in the solar cell module 72 of the present embodiment, it is possible to provide both a solar cell module having a low-cost and simple configuration, and a solar power generation device using the solar cell module that can ensure both transparency and power generation efficiency. The same effect as the embodiment can be obtained. The point which can utilize the light which injected from both surfaces of the light-guide plate 4 for an electric power generation, the point which can prevent the damage | wound and chip | tip of the protruding item | line 10, and the point which can implement | achieve the window of a multilayer structure are the same as that of the said embodiment.

On the other hand, in the case of this modified example, the projections 10 of the two light guide plates 4 are formed at positions shifted from each other. For example, the first inclined surface T1 of one light guide plate 4 and the other light guide plate 4 The flat surface F is opposed to the flat surface F. Therefore, the proportion of light that can be captured is increased compared to the above embodiment, and the power generation efficiency can be improved.

[Second Modification of Sixth Embodiment]
Hereinafter, a second modification of the present embodiment will be described with reference to FIG.
FIG. 17 is a cross-sectional view showing a solar cell module according to this modification.
In FIG. 17, the same components as those in FIG. 15 used in the above embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

In the solar cell module 74 of this modification, as shown in FIG. 17, four sets of the solar cell modules 2 (FIGS. 2 and 3) of the first embodiment are used. The four light guide plates 4 are laminated such that the first main surface 4a and the second main surface 4b are substantially parallel to each other. Further, the four light guide plates 4 are laminated via the air layer 68 so that the second main surface 4b on which the light traveling direction changing portion 7 composed of the plurality of ridges 10 is formed faces the same side. . In the case of this embodiment, each ridge 10 of all the light guide plates 4 has the light traveling direction of the light guide plate 4 on the ridge line of the ridge 10, the first inclined surface T1 and the second inclined surface T2 (the y-axis direction in FIG. 17). ) Are aligned.

In FIG. 17, the light L121 incident on the first inclined surface T1 from the first main surface 4a side of the first light guide plate 4 from the bottom is totally reflected by the first inclined surface T1, and its traveling direction is changed to the solar cell. It changes to the 1st end surface side in which the element 6 is provided (light L122, L123).
Further, the light L124 incident on the first inclined surface T1 from the first main surface 4a side of the second light guide plate 4 from the bottom is totally reflected by the first inclined surface T1, and the traveling direction thereof is changed to the solar cell element 6. (The light L125, L126).
In addition, the light L127 incident on the first inclined surface T1 from the first main surface 4a side of the third light guide plate 4 from the bottom is totally reflected by the first inclined surface T1, and the traveling direction thereof is changed to the solar cell element 6. Is changed to the first end face side where light is provided (lights L128 and L129).
Further, the light L130 incident on the first inclined surface T1 from the first main surface 4a side of the fourth light guide plate 4 from the bottom is totally reflected by the first inclined surface T1, and the traveling direction thereof is changed to the solar cell element 6. Is changed to the first end face side where light is provided (lights L131 and L132).
The light L133 incident on the second inclined surface T2 from the first main surface 4a side of the first light guide plate 4 from the bottom passes through the second inclined surface T2.

Also in the solar cell module 74 of the present modification, it is possible to provide both a solar cell module having a low-cost and simple configuration, and a solar power generation device using the solar cell module that can ensure both transparency and power generation efficiency. The same effect as the embodiment can be obtained.

In the case of this modification, the power generation efficiency can be improved without increasing the installation area by stacking the four light guide plates 4. The inventor performed a simulation of the power generation amount in this configuration. The dimensions of the first main surface 4a and the second main surface 4b of the light guide plate 4 are 1 m × 2 m, the thickness of the light guide plate 4 is 10 mm, and the inclination angle of the first inclined surface T1 of the light guide plate 4 is 24 degrees. . Further, the inclination angle of the second inclined surface T2 is set to 5 degrees, and the projected area ratio of the first inclined surface T1 and the second inclined surface T2 of the light guide plate 4 to the first main surface 4a is set to 1/20 or less. One side of the solar cell element 6 was 10 mm, the refractive index of the light guide plate 4 was 1.5, and the refractive index of air was 1.0. The amount of power generated when the solar cell module 74 was irradiated with sunlight from the first main surface 4a side of the light guide plate 4 was approximately 65W. Thus, according to the solar cell module 74 of this modification, it turned out that a sufficiently big electric power generation amount can be obtained.

[Third Modification of Sixth Embodiment]
Hereinafter, a third modification of the present embodiment will be described with reference to FIG.
FIG. 18 is a cross-sectional view showing a solar cell module according to this modification.
In FIG. 18, the same components as those in FIG. 17 used in the description of the second modification are denoted by the same reference numerals, and detailed description thereof is omitted.

In the solar cell module 76 of this modified example, as shown in FIG. 18, each ridge 10 of each light guide plate 4 has a ridgeline of the ridge 10, the light guide plate of the first inclined surface T1, and the second inclined surface T2. 4 are not aligned in the light traveling direction (y-axis direction in FIG. 18). That is, each protrusion 10 of one light guide plate 4 is formed at a position shifted in the light traveling direction of the light guide plate 4 with respect to each protrusion 10 of the remaining light guide plate 4. In other words, the first inclined surface T1 of one light guide plate 4 and the first inclined surfaces T1 of the remaining light guide plates 4 are normal to the first main surface 4a and the second main surface 4b of each light guide plate 4. They are arranged at different positions as seen from the direction. Other configurations are the same as those in the above embodiment.

In FIG. 18, the light L141 incident on the first inclined surface T1 from the first main surface 4a side of the first light guide plate 4 from the bottom is totally reflected by the first inclined surface T1, and the traveling direction thereof is changed to the solar cell. It changes to the 1st end surface side in which the element 6 is provided (light L142, L143).
Further, the light L144 incident on the first inclined surface T1 from the first main surface 4a side of the second light guide plate 4 from the bottom is totally reflected by the first inclined surface T1, and the traveling direction thereof is changed to the solar cell element 6. Is changed to the first end face side where light is provided (lights L145 and L146).
Moreover, the light L147 incident on the first inclined surface T1 from the first main surface 4a side of the third light guide plate 4 from the bottom is totally reflected by the first inclined surface T1, and the traveling direction thereof is changed to the solar cell element 6. Is changed to the first end face side where light is provided (lights L148 and L149).
In addition, the light L150 incident on the first inclined surface T1 from the first main surface 4a side of the fourth light guide plate 4 from the bottom is totally reflected by the first inclined surface T1, and the traveling direction thereof is changed to the solar cell element 6. Is changed to the first end face side where light is provided (lights L151 and L152).
Note that the light L153 incident on the second inclined surface T2 from the first main surface 4a side of the first light guide plate 4 from the bottom passes through the second inclined surface T2.

Also in the solar cell module 76 of this modification example, it is possible to provide a solar cell module having a simple structure at low cost and a solar power generation device using the solar cell module that can ensure both transparency and power generation efficiency. The same effect as the embodiment can be obtained.

The configuration of the second modified example described above is preferable in terms of ensuring the transparency of the light guide plate 4. However, in the case of this modification, since the convex strips 10 of the four light guide plates 4 are formed at positions shifted, the proportion of light that can be taken into the light guide plate 4 is increased compared to the second modification, Power generation efficiency can be improved.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the said embodiment, although the plate-shaped body was used as a light guide, the shape of a light guide is not limited to a plate-shaped body, For example, a rod-shaped body may be sufficient and can be changed suitably. In addition, the shape, size, number, arrangement, constituent material, manufacturing method, and the like of various components in the above embodiment are not limited to those illustrated in the above embodiment, and can be changed as appropriate.

The present invention can be used for a solar cell module, a solar power generation device, or the like.

DESCRIPTION OF SYMBOLS 1 Solar power generation device 2,13,17,22,26,31,36,40,48,51,66,70,72,74,76 Solar cell module 4,14,18,23,29,34,38 , 41, 49, 52 Light guide plate (light guide)
6 Solar cell element 7, 15, 20, 24, 27, 32, 43 Light traveling direction changing portion 44 Film (light traveling direction changing member)
67 Protection plate (protection member)
68 Air layer T1, T3 First inclined surface (reflection surface)
T2, T4 Second inclined surface (transmission surface)
F Flat surface (transmission surface)

Claims (13)

A first main surface, a second main surface, and a first end surface in contact with the first main surface and the second main surface, wherein light from the outside is incident from at least the first main surface and propagated inside the first main surface; A light guide that is emitted from a part of the first end surface;
A solar cell element that receives light emitted from a part of the first end face of the light guide, and
Reflecting the light incident from the first main surface to at least the second main surface side of the light guide, and changing the traveling direction of the light, and the light incident from the first main surface A solar cell module provided with a transmission surface that transmits the light to the outside. A light traveling direction changing unit that changes the traveling direction of the light by reflecting the light incident from the first major surface is provided on a part of the second light guide side of the light guide,
The light traveling direction changing unit is
A first inclined surface that constitutes the reflecting surface that is inclined so as to form a predetermined inclination angle with respect to the second main surface of the light guide and reflects light incident from the first main surface;
The transmission surface is inclined so as to form an inclination angle smaller than the inclination angle of the first inclined surface with respect to the second main surface of the light guide, and transmits the light incident from the first main surface. A second inclined surface;
The solar cell module according to claim 1. The light traveling direction changing portion has a curved planar shape that is curved so as to be convex toward the side far from the solar cell element when viewed from the normal direction of the second main surface of the light guide. Item 3. The solar cell module according to Item 2. The light traveling direction changing unit includes a plurality of structural body groups including a plurality of structural bodies having the first inclined surface and the second inclined surface, and between the one structural body group and the solar cell element. The solar cell module according to claim 2, wherein no other structure group is located. The light traveling direction changing portion is provided on a light traveling direction changing member separate from the light guide, and the light traveling direction changing member is disposed on the second main surface side of the light guide. 2. The solar cell module according to 2. Reflecting the light incident from the second main surface to the first main surface side of the light guide and changing the traveling direction of the light, and transmitting the light incident from the second main surface The solar cell module according to claim 1, further comprising a transmission surface that is allowed to be emitted to the outside. The reflective surface on the first main surface side of the light guide and the reflective surface on the second main surface side are from normal directions of the first main surface and the second main surface of the light guide. The solar cell module according to claim 6, wherein the solar cell module is arranged at different positions as viewed. The solar cell module according to claim 1, further comprising a protective member that protects the reflective surface via an air layer on at least the second main surface side of the light guide provided with the reflective surface. 2. The solar cell module according to claim 1, wherein a plurality of the light guides are stacked in a posture in which the first main surface and the second main surface of the light guide are substantially parallel. The solar cell module according to claim 9, wherein the two light guides having the reflection surface provided on the second main surface side are stacked in a direction in which the second main surfaces face each other. 10. The sun according to claim 9, wherein the plurality of reflecting surfaces of the plurality of light guides are arranged at different positions when viewed from the normal direction of the first main surface and the second main surface of the light guide. Battery module. The solar cell module according to claim 1, wherein the light guide has a function of absorbing or reflecting infrared light. A first main surface, a second main surface, and a first end surface in contact with the first main surface and the second main surface, wherein light from the outside is incident from at least the first main surface and propagated inside the first main surface; A light guide that is emitted from a part of the first end surface;
A solar cell element that receives light emitted from a part of the first end face of the light guide, and
Reflecting the light incident from the first main surface to at least the second main surface side of the light guide, and changing the traveling direction of the light, and the light incident from the first main surface A solar power generation apparatus provided with the solar cell module provided with the permeation | transmission surface which permeate | transmits and inject | emits outside.

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