JPH07131072A - Surface mounting type side light emitting device, light emitting device using the same, and liquid crystal display device using the light emitting device - Google Patents

Abstract

(57) [Summary] [Object] It is an object to provide a light-emitting device for side surface light emission, a light-emitting device using the light-emitting device, and a liquid crystal display device. A regular hexahedron-shaped main body containing an LED element, and a light emitting window portion formed on one surface of the main body, and a surface excluding the surface forming the light emitting window portion and a surface facing the surface are mounted. The basic structure is a surface-mounting side surface light-emitting device which has a pair of electrodes formed on the outer peripheral portion of the mounting surface.
When the surface-mounting side light-emitting device is used as a backlight for a light-emitting device or a liquid crystal display device, the surface-mounting side-lighting device is arranged on the end face of a translucent plate.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type side light emitter,
The present invention also relates to a light emitting device using the same and a liquid crystal display device using the light emitting device, and more particularly, to a device configured so that a side surface light emitter is suitable for being incorporated in a light emitting device such as a liquid crystal display device.

2. Description of the Related Art Conventionally, there has not been a light emitting device exclusively for side light emission.
No. 61-42868, (B) No. 61-575
It was general to improve the light emitting device disclosed in No. 48 and use it so as to emit light to the side surface side. That is,
As shown in FIGS. 11 to 14, the surface emitting device (A) has a main body 50 in which an LED element is resin-sealed, and both side surfaces 50A of the main body 50 are connected to an anode electrode lead 51 and a cathode. The lead electrode lead 51 is led out, and when both electrodes 51 are mounted on the substrate K and electricity is applied, light is emitted upward. When such a surface light-emitting device emits light from the side surface, as shown in FIGS. 12 and 13, a housing recess K1 is formed in the substrate K to be mounted, and the main body 50 is housed in this recess K1 to emit light from the side surface. Was provided. When the LED lamp 60 such as the light emitter of (B) is used for side surface light emission, a holder 61 having an L-shaped guide passage for holding a lead is used as shown in FIG. , The holder 60 of the LED lamp 60 lead 60
It was fixed in the bent state of A and used for improving side light emission.

SUMMARY OF THE INVENTION In the above conventional one,
For example, in the case of (A), not only is it necessary to form the storage recess K1 in the board K to be mounted, but also the board K is provided with both leads.
Since it is fixed with solder or the like only at two points of the leads 51, 51, the holding force in the direction of rotation about the direction in which both the leads 51, 51 are led out is low, and as shown in FIG. There is an inconvenience that it is necessary to form a projecting lens 52 and use a device such as supporting the projecting lens 52 and the leads 51, 51 at three points. When a backlight of a liquid crystal display device is to be created using such a side light emitter, the side light emitter is arranged on the side of the plate-shaped lens body 53 as shown in FIG. However, the bulging lens 52 is housed on the side portion of the lens body 53 because the light cannot be efficiently guided to the inside of the lens body 53 only by disposing the bulging lens 52 on the side portion of the lens body 53. It was necessary to purposely provide the concave portion 54 for this. Further, in the case of (B), there is a problem that not only the dedicated holder-61 is required, but also another manufacturing process is required for incorporating the holder-61. Further, since such an assembling process is complicated, it is generally performed manually. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a novel light emitting device for side surface light emission.

In order to solve the above problems, the present invention takes the following technical means. That is, the surface-mounting side light-emitting device according to claim 1 of the present application has a regular hexahedron-shaped main body containing an LED element, and a light-emitting window portion formed on one surface of the main body, while the light-emitting window portion is provided. A structure is adopted in which the surface other than the surface to be formed and the surface opposite to this surface is used as a mounting surface, and a pair of electrodes is formed on the outer peripheral portion of the mounting surface. In the surface mount type side light emitter according to claim 2, the both electrodes according to claim 1 are provided along an outer peripheral portion of the mounting surface facing from the corner portion of the facing surface of the light emitting window portion to the light emitting window portion. Is characterized in that a chamfered portion is continuously formed and both electrodes are provided at this chamfered portion. The chamfered portion (so-called cutout portion) may be provided in the entire outer peripheral portion of the mounting surface, but it is not necessarily provided in the entire area and may be configured to extend from the corner portion by an appropriate length. . Further, in the present invention, the electrodes are anode electrodes and cathode electrodes having different polarities, and both corners of the side in contact with the mounting surface in the outer peripheral portion of the surface facing the light emitting window portion. A pair of electrodes is provided at both corners of the other side opposite to the side where the electrodes are provided, and the electrodes provided at the two corners of the other side have adjacent electrodes with different polarities. The structure is adopted so that it becomes an anode or cathode electrode. In addition, in Claim 3, although the structure which provides all the electrodes in the corner | angular part of a main body is employ | adopted, this is not limited to this, An electrode is one side surface which formed the light emission window part of the main body. Needless to say, it may be provided at any place as long as it is provided including the outer peripheral portion in contact with the mounting surface. The mounting surface of the main body according to claim 4 is characterized in that a mounting projection is formed. The mounting projection is fitted into a recess formed in the mounting substrate and is positioned and fixed. The mounting projection may be provided at any position on the mounting surface. When forming on the corner of the side surface facing the one side surface,
It is advisable to provide them at equal distances from the two electrodes and away from them. A fifth aspect of the present invention relates to a light emitting device (backlight) of a liquid crystal display device or a light emitting device as a mere flat plate-like light emitting device. The surface mount type side light emitting device according to any one of the first to fourth aspects is provided. It is characterized in that the light emitting window portion is provided on the end surface of the transparent plate-like body provided on the surface of the circuit board. A sixth aspect relates to a liquid crystal display device, wherein a semiconductor element for driving a liquid crystal is provided on the same circuit board provided with the light emitting device of the fourth aspect, and an LCD glass is disposed on the light emitting side of the translucent plate. It is characterized by that.

According to the present invention having the above-described structure, when mounting a surface-mounting side light-emitting device, the mounting surface of a regular tetrahedron-shaped main body containing the LED element is arranged on the surface of a circuit board to be mounted, for example. At the same time, the wiring pattern of this circuit board can be connected to the electrodes provided on the outer peripheral portion of the mounting surface for surface mounting. If chamfered portions are continuously formed along the outer peripheral portion of the mounting surface facing the light emitting window portion from the corners of the facing surface of the light emitting window portion, and if both electrodes are provided at this chamfered portion,
It works so as to increase the adhesion area where it is adhered to the circuit board when it is surface-mounted. Further, if the cathode electrodes or the anode electrodes are provided so as not to be adjacent to each other at the four corners of the side surface facing the one side surface on which the light emitting window portion is formed, the side surface and the one side portion on which the light emitting window portion is formed are provided. Any of the other surfaces of the continuous body acts as a mounting surface. Further, if a mounting convex portion is formed on the mounting surface of the main body, for example, a mounting concave portion is formed on the circuit board to be mounted, and the convex portion is fitted into the concave portion to form the surface mounting side light emitting device on the circuit board. It can also be positioned. Then, by arranging the light-transmitting plate-shaped body provided on the surface of the circuit board so that one side portion having the light-emitting window of the above-mentioned surface-mounted light-emitting device is in contact with the end face of the light-transmitting plate, the light-transmitting plate is formed. The light efficiently guides the light to the light-transmitting plate-like body itself to emit light, thereby functioning as a light-emitting device. Further, such a light emitting device can be used as a light emitting body (backlight) for a liquid crystal display device.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings. 1 is a perspective view showing a surface-mounted side light emitting device of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a side view of FIG. 1, FIG. 4 is a plan view of FIG. 1, and FIG. It is a rear view. Reference numeral 1 denotes a surface-mounting side surface light-emitting device having a substantially regular hexahedron shape. The light-emitting device 1 is a glass epoxy substrate 5 having a thickness of about 0.8 mm and a thickness of 0.8 mm bonded to the glass epoxy substrate 5 with an adhesive material. The main structure is a reflective case 10 of a certain degree. The glass epoxy substrate 5 has a substantially rectangular shape (2.0 mm × 3.0 mm) in which arc-shaped cutouts penetrating in the thickness direction are formed at its four corners, and the surface thereof is LE.
The island portion 6 for die-bonding the anode side of the D element 2 and the bonding pad portion 7 connected to the surface (cathode side) of the die-bonded LED element 2 by the wire 3 are independently printed and fired. On the other hand, an anode electrode 8 and a cathode electrode 9 are provided in the cutout portion of the glass epoxy substrate 5. The island portion 6 and the anode electrode 8, and the bonding pad portion 7 and the cathode electrode 9 are electrically connected by a wiring pattern 5A formed by printing on the glass epoxy substrate 5, respectively. In this embodiment, 8 is an anode electrode and 9 is a cathode electrode. However, not limited to this, 8 can be a cathode electrode and 9 can be an anode electrode. In this embodiment, the glass epoxy substrate 5 made of the glass / epoxy material is adopted, but the present invention is not limited to this, and a substrate made of a ceramic material or the like can also be used. The shape is not limited to the chamfered one, and an appropriate shape such as a chamfered chamfer may be adopted. However, cutouts are provided at the four corners, and the anode electrode 8 and the cathode electrode 9 are formed along the shape of the cutouts.
9 is adhered to the pad P of the circuit board K with a conductive adhesive material such as solder (see FIG. 6), so that the surface-mounted side light-emitting device 1 can be obtained.
Can be firmly surface-mounted. That is, since the notch portion is provided, a thick solder layer H can be formed between the electrodes 8 and 9 of the surface light emitter 1 and the pad P, and a sufficient solder fillet can be secured. The effect that the mounting side light emitter 1 can be fixed is obtained. Such a notch is not limited to the arc shape as described above, but may be chamfered obliquely. In this embodiment, a pair of the anode electrode 8 and the cathode electrode 9 is provided, but this has two mountable surfaces when the surface mounting side light emitting device 1 is surface mounted. This is because it is a surface, and if the mountable surface is only one surface, at least the anode electrode 8 and the cathode electrode 9 may be provided one by one on the outer peripheral portion of the mounting surface. 9 and 10 show modified examples of the glass epoxy substrate 5. Figure 9 is LE
FIG. 10 is a front view showing a state of the glass epoxy substrate 10 on which the D element 2 is mounted, viewed from the front surface side, and FIG. 10 is a rear view seen from the back surface side of FIG. 9. In the glass epoxy substrate 5, the anode electrode 8 and the cathode electrode 9 are the same on both mounting surfaces.
Since the cathode electrodes 9 and the cathode electrodes 9 are arranged so as to face each other, only two mounting surfaces can be used. However, as in this modification, the electrode 8 or 9 is provided at one corner and the adjacent electrode. Among the two pairs of diagonals of the glass epoxy substrate 5, the wiring pattern 5A has an intersecting structure (X) on the front and back sides (see FIG. 9) so that four electrodes become mounting surfaces. be able to. That is, it can be mounted on the four sides of the glass epoxy substrate 5 shown in FIGS. The reflection case 10 has substantially the same outer shape as the glass epoxy substrate, and is a frame body 1 made of a light-shielding material in which a light emitting window frame 11A is formed.
1 and a light emitting window portion 12 sealed with a translucent resin so as to close the light emitting window portion frame 11A. Specifically, on the mounting surface of the LED element 2 of the glass epoxy substrate 5, the frame element 11 is bonded to the mounting surface of the LED element 2 with a light-shielding adhesive so that the LED element is located inside the light emitting window frame 11A of the frame body 11, After that, a translucent resin is dropped from the light emitting window frame 11A by a technique such as potting, and the LED element is included and resin-sealed. By sealing the LED element 2 with the resin in this manner, it is possible to avoid the risk of water entering the LED element 2 and destroying the element 2. Then, the reflection case
A reflective surface 11B that gradually expands toward the outside is formed on the light emission window frame 11A of the space 10 so that the light emitted by the LED element 2 can be efficiently led to the outside. Note that FIG.
If a convex portion 11C integrally molded with the frame body 11 is formed so as to be indicated by an imaginary line, the circuit board K is fitted into a concave portion K3 provided in the circuit board K as a mounting board.
It can be easily positioned and firmly fixed. FIG. 7 shows a light emitting device made by using a plurality of the surface mount side light emitting devices 1 described above. In the light emitting device, the back surface 21 of the light-projecting plate-like body 20 having substantially the same thickness as that of the surface-mounted side light-emitting device 1 is adhered to the surface of the circuit board K with an adhesive or the like, and the circuit board K is also used. The surface of the plate-like body 20
A plurality of surface-mounted side light-emitting devices 1 are provided so that the light-emitting window portions 12 are in contact with the end face 22 of the. Although not shown, a reflection film is provided by sticking or printing so as to prevent light from leaking, except for the end face 22 in contact with the light emitting window portion 12. If the reflective film is provided in this way, the reflection efficiency is improved, but even if it is not provided, most of the light is totally reflected at the interface of the plate-like body 20, that is, the interface between the inside and outside of the plate-like body 20. Therefore, it is not necessary to provide a reflective film unless high efficiency is pursued. On the back surface 21 of the plate-shaped body 20, a corrugated plate is provided for guiding the light of the surface-mounted side surface light-emitting device 1 introduced from the end surface 22 while reflecting the light inward and efficiently and uniformly reflecting the light from the surface 23 to the outside. The shape has been processed. FIG. 8 shows an embodiment in which the light emitting device is used as a backlight of a liquid crystal display device. This is an LCD for arranging the LCD glass 30 on the surface 21 side of the plate-like body 20 of FIG. 7 described above and further enclosing the LCD glass 30 and the plate-like body 20 from the outside so as not to leak light.
A cover 31 is provided. 32 is a liquid crystal screen, 33 is a drive I for driving the liquid crystal in the LCD glass 30.
It is C. In this way, the circuit board K for providing the surface-mounted side light-emitting device 1 as a light-emitting device and the circuit board K for providing electronic components such as the driving IC 33 of the liquid crystal display device are the same substrate to reduce the number of components. A transparent plate-like body (light guide plate) having a size suitable for the liquid crystal screen 32
If 20 is prepared in advance and the plate-like body 20, the surface-mounting side light-emitting device 1, the LCD glass 30, and the LCD cover 31 are sequentially provided at the same time as the driving IC 33 (in the same step), a liquid crystal display device can be efficiently used. Can be manufactured.

According to the present invention, for example, only by mounting the surface mount type side light emitting device of the present invention on the surface of a circuit board, side light emission can be achieved without using a dedicated holder as in the conventional case. You can Further, if the cathode electrodes or the anode electrodes are provided so as not to be adjacent to each other at the four corners of the side surface facing the one side surface on which the light emitting window portion is formed, except for the light emitting window portion and the side surface opposed thereto. Since it is possible to mount on all surfaces, there is less risk of mounting error. Further, if a mounting convex portion is formed on the mounting surface of the main body, for example, a mounting concave portion is formed on the circuit board to be mounted, and the convex portion is fitted into the concave portion to form the surface mounting side light emitting device on the circuit board. Can be positioned. Further, when an electrode is formed on a corner of a side surface opposite to the one side surface on which the light emitting window is formed and is mounted (fixed) on the circuit board K with solder or the like, the side where the electrode is formed is sufficiently fixed with the solder. However, since the light emitting window portion side is not directly fixed, there is a risk of insufficient fixing force. However, if the convex portion is provided on the mounting surface on the light emitting window portion side, a stronger fixing force can be obtained by inserting the convex portion into the concave portion of the circuit board. Then, the flat plate-shaped light emitting device is simply arranged by arranging so that one side portion having the light emitting window portion of the above-mentioned surface mount light emitting device is in contact with the end surface of the translucent plate-shaped body provided on the surface of the circuit board. Or as a backlight of a liquid crystal display device.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a surface-mounted side light emitting device of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a right side view in which a part of FIG. 1 is cut away.

FIG. 4 is a side view of FIG.

FIG. 5 is a rear view of FIG.

6 is a state diagram showing a state in which the surface-mounted side light-emitting device of FIG. 1 is mounted on a circuit board.

FIG. 7 is a perspective view showing a light emitting device of the present invention.

FIG. 8 is an exploded perspective view showing a liquid crystal display device of the present invention.

9 is a front view showing a modified example of the surface-mount side light-emitting device shown in FIG.

FIG. 10 is a rear view of FIG.

FIG. 11 is a perspective view showing a conventional light emitting device.

FIG. 12 is a perspective view when FIG. 11 is used for side light emission. FIG. 12 is a perspective view showing a light emitting device of the present invention.

FIG. 13 is a side sectional view of FIG.

FIG. 14 is an exploded perspective view showing a light emitting device using the light emitting device of FIG.

FIG. 15 is a side sectional view of a conventional LED lamp for side surface emission.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface-mount side light emitter 2 LED element 8 Anode electrode 9 Cascade electrode 11C Mounting convex portion 20 Translucent plate-like body 30 LCD glass 5, 25 Light emitting window portion 4 LED lamp

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[Procedure amendment]

[Submission date] November 11, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Detailed explanation of the invention

[Correction method] Change

[Correction content]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type side light emitter,
The present invention also relates to a light emitting device using the same and a liquid crystal display device using the light emitting device, and more particularly, to a device configured so that a side surface light emitter is suitable for being incorporated in a light emitting device such as a liquid crystal display device.

[0002]

2. Description of the Related Art Conventionally, there has not been a light emitting device exclusively for side light emission.
No. 61-42868, (B) No. 61-575
It was general to improve the light emitting device disclosed in No. 48 and use it so as to emit light to the side surface side.

That is, the surface emitting device of the above (A) is shown in FIG.
As shown in FIGS. 1 to 14, a main body 50 in which an LED element is resin-sealed, and both side surfaces 50A of the main body 50 are anodized.
The lead electrode lead 51 and the cathode electrode lead 51 are led out, and when both electrodes 51 are mounted on the substrate K and energized, light is emitted upward. When such a surface light-emitting device emits light from the side surface, as shown in FIGS. 12 and 13, a housing recess K1 is formed in the substrate K to be mounted, and the main body 50 is housed in this recess K1 to emit light from the side surface. Was provided.

Further, an LED such as the light emitter of the above (B)
When the lamp 60 is used for side surface light emission, FIG.
As shown in FIG. 3, a holder 61 having an L-shaped guide passage for holding the lead is used, and the LED is used by the holder 61.
The lead 60A of the lamp 60 was fixed in a bent state and modified for side light emission.

[0005]

SUMMARY OF THE INVENTION In the above conventional one,
For example, in the case of (A), not only is it necessary to form the storage recess K1 in the board K to be mounted, but also the board K is provided with both leads.
Since it is fixed with solder or the like only at two points of the leads 51, 51, the holding force in the direction of rotation about the direction in which both the leads 51, 51 are led out is low, and as shown in FIG. There is an inconvenience that it is necessary to form a projecting lens 52 and use a device such as supporting the projecting lens 52 and the leads 51, 51 at three points. When a backlight of a liquid crystal display device is to be created using such a side light emitter, the side light emitter is arranged on the side of the plate-shaped lens body 53 as shown in FIG. However, the bulging lens 52 is housed on the side portion of the lens body 53 because the light cannot be efficiently guided to the inside of the lens body 53 only by disposing the bulging lens 52 on the side portion of the lens body 53. It was necessary to purposely provide the concave portion 54 for this.

In the case of (B), a dedicated holder-
There is a problem that not only 61 is required, but also another manufacturing process is required for assembling into the holder 61. Also,
Since such an assembling process is complicated, it is generally performed manually. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a novel light emitting device for side surface light emission.

[0007]

In order to solve the above problems, the present invention takes the following technical means. That is, the surface-mounting side light-emitting device according to claim 1 of the present application has a regular hexahedron-shaped main body containing an LED element, and a light-emitting window portion formed on one surface of the main body, while the light-emitting window portion is provided. A structure is adopted in which the surface other than the surface to be formed and the surface opposite to this surface is used as a mounting surface, and a pair of electrodes is formed on the outer peripheral portion of the mounting surface.

In a surface mount type side surface light emitter according to a second aspect of the present invention, both electrodes according to the first aspect of the present invention are configured such that the outer periphery of the mounting surface facing the light emitting window portion from the corners of the facing surface of the light emitting window portion. A feature is that chamfered portions are continuously formed along the portion, and both electrodes are provided at the chamfered portions. The chamfered portion (so-called cutout portion) may be provided in the entire outer peripheral portion of the mounting surface, but it is not necessarily provided in the entire area and may be configured to extend from the corner portion by an appropriate length. .

According to a third aspect of the present invention, the both electrodes are anode electrodes and cathode electrodes having different polarities, and a side of the outer peripheral portion of the surface facing the light emitting window portion, which is in contact with the mounting surface. In addition to providing a pair of electrodes at the both corners of the other side opposite to the side provided with both electrodes,
The electrodes provided at both corners of the other side have a structure in which adjacent electrodes are anode or cathode electrodes having different polarities.

In the third aspect, all the electrodes are provided at the corners of the main body. However, the first aspect is not limited to this, and the electrodes form the light emitting window of the main body. It goes without saying that it may be provided at any place as long as it is provided including the outer peripheral portion in contact with the mounting surface except one side surface. The mounting surface of the main body according to claim 4 is characterized in that a mounting projection is formed. The mounting projection is to be fitted into a recess formed in the mounting board and positioned and fixed, and may be provided at any place on the mounting surface.
When the electrodes are formed at the corners of the side surface facing the one side surface forming the light emitting window as in the second aspect, it is preferable to provide the electrodes at equal intervals and away from the both electrodes.

A fifth aspect of the present invention relates to a light emitting device (backlight) of a liquid crystal display device or a light emitting device as a simple plate-shaped light emitting device, and the surface mount type side surface according to any one of the first to fourth aspects. The light emitting device is characterized in that the light emitting device is provided so that the light emitting window portion thereof is located on the end face of the translucent plate member provided on the surface of the circuit board. A sixth aspect relates to a liquid crystal display device, wherein a semiconductor element for driving a liquid crystal is provided on the same circuit board provided with the light emitting device of the fourth aspect, and an LCD glass is disposed on the light emitting side of the translucent plate. It is characterized by that.

[0012]

According to the present invention having the above-described structure, when mounting a surface-mounting side light-emitting device, the mounting surface of a regular tetrahedron-shaped main body containing the LED element is arranged on the surface of a circuit board to be mounted, for example. At the same time, the wiring pattern of this circuit board can be connected to the electrodes provided on the outer peripheral portion of the mounting surface for surface mounting. If chamfered portions are continuously formed along the outer peripheral portion of the mounting surface facing the light emitting window portion from the corners of the facing surface of the light emitting window portion, and if both electrodes are provided at this chamfered portion,
It works so as to increase the adhesion area where it is adhered to the circuit board when it is surface-mounted.

Further, if the cathode electrodes or the anode electrodes are provided so as not to be adjacent to each other at the four corners of the side surface facing the one side surface on which the light emitting window portion is formed, the light emitting window portion is formed. Any of the other surfaces of the body that are continuous with the sides act as mounting surfaces. Further, if a mounting convex portion is formed on the mounting surface of the main body, for example, a mounting concave portion is formed on the circuit board to be mounted, and the convex portion is fitted into the concave portion to form the surface mounting side light emitting device on the circuit board. It can also be positioned.

Then, by arranging the light-transmitting plate-shaped body provided on the surface of the circuit board so that one side portion having the light-emitting window portion of the above-mentioned surface-mounted light-emitting device is in contact with the end surface of the light-transmitting plate-like body, Light is efficiently guided to the light-transmissive plate-like body, and the light-transmissive plate-like body itself emits light to function as a light emitting device. Further, such a light emitting device can be used as a light emitting body (backlight) for a liquid crystal display device.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings. 1 is a perspective view showing a surface-mounted side light emitting device of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a side view of FIG. 1, FIG. 4 is a plan view of FIG. 1, and FIG. It is a rear view. Reference numeral 1 denotes a surface-mounting side surface light-emitting device having a substantially regular hexahedron shape. The light-emitting device 1 is a glass epoxy substrate 5 having a thickness of about 0.8 mm and a thickness of 0.8 mm bonded to the glass epoxy substrate 5 with an adhesive material. The main structure is a reflective case 10 of a certain degree.

The glass-epoxy substrate 5 has a substantially rectangular shape (2.0 mm × 3.0 mm) in which four corners are formed with arcuate cutouts penetrating in the thickness direction, and the surface thereof is LE.
The island portion 6 for die-bonding the anode side of the D element 2 and the bonding pad portion 7 connected to the surface (cathode side) of the die-bonded LED element 2 by the wire 3 are independently printed and fired. On the other hand, an anode electrode 8 and a cathode electrode 9 are provided in the cutout portion of the glass epoxy substrate 5.

Then, the island portion 6 and the anode electrode 8 are provided.
And the bonding pad 7 and the cathode electrode 9 are
Wiring patterns printed and formed on the glass epoxy substrate 5, respectively.
5A electrically connected. In this embodiment, 8 is an anode electrode and 9 is a cathode electrode. However, not limited to this, 8 can be a cathode electrode and 9 can be an anode electrode.

In this embodiment, the glass epoxy substrate 5 made of the glass / epoxy material is adopted, but the present invention is not limited to this, and a substrate made of a ceramic material or the like may be adopted. In addition to the chamfered chamfer, a chamfered chamfer may be used. However, notches are provided at the four corners, the anode electrode 8 and the cathode electrode 9 are formed along the shape of the notches, and both electrodes 8 and 9 are used as a conductive adhesive material such as solder. The surface mounting side light emitting device 1 can be firmly surface mounted by adhering it to the pad P of the circuit board K (see FIG. 6). That is, since the notch portion is provided, a thick solder layer H can be formed between the electrodes 8 and 9 of the surface light emitter 1 and the pad P, and a sufficient solder fillet can be secured. The effect that the mounting side light emitter 1 can be fixed is obtained. Such a notch is not limited to the arc shape as described above, but may be chamfered obliquely.

In this embodiment, the anode electrode 8 and the cathode electrode 9 are provided in pairs, but this can be mounted when the surface mounting type side light emitting device 1 is surface mounted. This is because the number of surfaces is two, and if the number of mountable surfaces is only one, then at least the anode electrode 8 and the cathode electrode 9 can be provided one by one on the outer peripheral portion of the mounting surface. good.

9 and 10 show modified examples of the glass epoxy substrate 5. FIG. 9 is a front view showing a state of the glass epoxy substrate 10 on which the LED element 2 is mounted as seen from the front side, and FIG. 10 is a rear view as seen from the back side of FIG. In the glass epoxy substrate 5, the anode electrode 8 and the cathode electrode 9 are arranged so that the same anode electrodes 8 and the cathode electrodes 9 are opposed to each other on the two mounting surfaces. Although only two surfaces can be used, two pairs of diagonals of the glass-epoxy substrate 5 are arranged so that one corner electrode provided with the electrodes 8 or 9 and the adjacent electrode are different electrodes as in this modification. Of these, the four sides can be used as mounting surfaces by forming a cross structure (X) of the wiring patterns 5A on the front and back (see FIG. 9). That is, it can be mounted on the four sides of the glass epoxy substrate 5 shown in FIGS.

The reflection case 10 has substantially the same outer shape as the glass epoxy substrate, and closes the light emitting window frame 11A and a frame body 11 made of a light-shielding material in which a light emitting window frame 11A is formed. The light emitting window portion 12 is sealed with a light-transmitting resin. Specifically, the LED element is mounted on the mounting surface of the glass epoxy substrate 5 on which the LED element 2 is mounted.
It is adhered to the frame 11 with a light-shielding adhesive so as to be located inside, and then a light-transmissive resin is dropped from the light emitting window frame 11A by a technique such as potting to form the LED.
It is made of resin including elements. LED element 2
By sealing the LED element with a resin, it is possible to avoid the risk of water entering the LED element 2 and destroying the element 2.

The light emitting window frame 11A of the reflection case 10 is provided with a reflecting surface 11B which gradually expands toward the outside so that the light emitted from the LED element 2 can be efficiently led to the outside. . If a convex portion 11C integrally molded with the frame body 11 is formed as indicated by a phantom line in FIG. 6, a concave portion K provided on the circuit board K as a mounting substrate is formed.
By fitting into 3, the circuit board K can be easily positioned and firmly fixed.

FIG. 7 shows a light emitting device made by using a plurality of the surface mount type side light emitters 1 described above. In the light emitting device, the back surface 21 of the light-projecting plate-like body 20 having substantially the same thickness as that of the surface-mounted side light-emitting device 1 is adhered to the surface of the circuit board K with an adhesive or the like, and the circuit board K is also used. The light emitting window portion 1 is provided on the end face 22 of the plate-like body 20 on the surface.
A plurality of surface mount type side surface light emitters 1 are provided so that the two are in contact with each other. Although not shown, the end face 22 in contact with the light emitting window portion 12
Besides, a reflection film is attached or printed to prevent light from leaking. If the reflection film is provided in this way, the reflection efficiency is improved, but even if it is not provided, the plate-like body 2
Since most of the light is totally reflected at the interface of 0, that is, the interface between the inside and the outside of the plate-shaped body 20, it is not necessary to provide a reflective film unless high efficiency is pursued.

In order to guide the light of the surface-mounted side surface light-emitting device 1 introduced from the end face 22 to the back surface 21 of the plate-like body 20 while reflecting the light inward, and efficiently and uniformly reflecting the light from the surface 23 to the outside. Is processed into a corrugated plate shape. FIG. 8 shows an embodiment in which the light emitting device is used as a backlight of a liquid crystal display device.

In this device, the LCD glass 30 is arranged on the surface 21 side of the plate-like body 20 shown in FIG. 7, and the LCD glass 30 and the plate-like body 20 are wrapped from the outside so as not to leak light. LCD cover 31 is provided. 32 is a liquid crystal screen, 33 is a drive IC for driving the liquid crystal in the LCD glass 30.

In this way, the circuit board K for providing the surface-mounting side light-emitting device 1 as a light emitting device and the circuit board K for providing electronic parts such as the driving IC 33 of the liquid crystal display device are the same board, and the number of parts is reduced. Can be reduced,
A translucent plate-like body (light guide plate) 20 having a size suitable for the liquid crystal screen 32 is prepared in advance, and is simultaneously with the drive IC 33 (the same process).
The plate-shaped body 20, the surface-mounted side light-emitting device 1, the LCD
A liquid crystal display device can be efficiently manufactured by adopting a method of sequentially providing the glass 30 and the LCD cover 31.

[0027]

According to the present invention, for example, only by mounting the surface mount type side light emitting device of the present invention on the surface of a circuit board, side light emission can be achieved without using a dedicated holder as in the conventional case. You can Further, if the cathode electrodes or the anode electrodes are provided so as not to be adjacent to each other at the four corners of the side surface facing the one side surface on which the light emitting window portion is formed, except for the light emitting window portion and the side surface opposed thereto. Since it is possible to mount on all surfaces, there is less risk of mounting error.

Further, when the mounting convex portion is formed on the mounting surface of the main body, for example, the mounting concave portion is formed on the circuit board to be mounted, and the convex portion is fitted into the concave portion to form the surface mounting type side light emitting device. It can be positioned on the circuit board. Further, electrodes are formed on the corners of the side surface opposite to the one side surface on which the light emitting window is formed, and are mounted (fixed) on the circuit board K by soldering or the like.
In this case, the side on which the electrodes are formed can be sufficiently fixed with the solder, but the light emitting window side is not directly fixed, and thus the fixing force may be insufficient. However, if the convex portion is provided on the mounting surface on the light emitting window portion side, a stronger fixing force can be obtained by inserting the convex portion into the concave portion of the circuit board.

A flat plate-like structure can be obtained by simply arranging the light-transmitting plate-like member provided on the surface of the circuit board so that one end of the surface-mounted light-emitting device having the light-emitting window is in contact with the end face of the plate-like member. It can be used as a backlight of a light emitting device or a liquid crystal display device.

Claims (6)

[Claims] 1. A hexahedron-shaped main body containing an LED element, a light emitting window portion formed on one surface of the main body, and a surface excluding a surface forming the light emitting window portion and a surface facing the surface. A surface-mounting side light-emitting device, which is a mounting surface and has a pair of electrodes formed on the outer peripheral portion of the mounting surface. 2. A chamfered portion is continuously formed along an outer peripheral portion of the mounting surface facing the light emitting window portion from a corner portion of the surface facing the light emitting window portion, and the chamfered portion is formed at the chamfered portion. The surface-mounted surface-emitting device according to claim 1, further comprising electrodes. 3. The both electrodes are an anode electrode and a cathode electrode having different polarities, and are provided at both corners of a side in contact with the mounting surface in an outer peripheral portion of a surface facing the light emitting window portion. Further, a pair of electrodes is further provided at both corners of the other side opposite to the side where the electrodes are provided, and the electrodes provided at the two corners of the other side have adjacent electrodes with different polarities.
2. The surface-mounted side light-emitting device according to claim 1, wherein the anode electrode and the cathode electrode are arranged so as to form a cathode or cathode electrode. 4. The surface-mounted side light-emitting device according to claim 1, wherein a mounting projection is formed on the mounting surface of the main body. 5. The surface-mounting side light-emitting device according to any one of claims 1 to 4, wherein the light-emitting window portion is located at an end face of a light-transmissive plate member provided on the surface of the circuit board. Light emitting device. 6. The liquid crystal display according to claim 5, wherein the circuit board of the light emitting device is provided with a semiconductor element for driving a liquid crystal, and an LCD glass is arranged on the light emitting side of the translucent plate. apparatus.