CN207337053U - Projector - Google Patents

Abstract

The present invention discloses a projector, which is a projector with a dual light valve structure in the embodiment. The light source in the projector outputs illumination light, part of the main illumination light is excited by one area of the fluorescent wheel to output secondary illumination light with different wavelengths, and part of the main illumination light continues to the optical path through the other area of the fluorescent wheel. The main illumination light and the secondary illumination light pass through the fly-eye lens, are split by the light splitting element, and are split into two lights with different colors, one light enters one light valve, the other light enters the other light valve together with the part of the main illumination light, and the two light valves respectively convert the illumination lights with different colors into image lights. Then, the image light of each light valve is output to the projection lens through a light combining optical element, and the image is projected onto a surface.

Description

Projector

technical field

The utility model relates to a projector, in particular to a projector with a double light valve structure.

Background technique

The development of science and technology promotes the progress of the times, and because the needs of consumers change greatly, the projectors on the market are constantly being introduced. In digital projectors, light valves are often used to convert illumination light into image light, and digital projector products generally use different light valve structures as a way to distinguish projectors. According to the type of light valve, the main technologies can be divided into three types: Liquid-Crystal Display (LCD), Digital Light Processing (DLP) and Liquid Crystal On Silicon (LCOS). In response to consumers' increasing demand for brightness, some operators have begun to use a multi-light valve structure to simultaneously provide images of multiple wavelengths so as to increase the overall brightness of the projector.

Among them, the use of double light valve design can achieve better brightness without the difficulty of using three light valve design and production. This is a direction worth striving for.

Utility model content

An embodiment of the utility model provides a projector, including a light source, a lens group, a light splitting element, a lens group, a fluorescent wheel, a lens group, a reflector group, a fly-eye lens, and a lens group. The light source can output a first color light beam; the fluorescent wheel has a first area and a second area, the first area can receive the first color light beam and excite and output a second color light beam, and the first color light beam can pass through the second area , continue the optical path; the fly-eye lens is set on the traveling path of the first color light beam and the second color light beam; The beam conversion output is a third-color beam and a fourth-color beam with different optical paths; converted into the first image beam; and the second light valve is set on the traveling path of the fourth color beam, which can convert the fourth color beam into the second image beam; and the light-combining optical element can combine the first image beam and the second image beam Two image light beams; wherein, the color of the first color light beam, the color of the second color light beam, the color of the third color light beam and the color of the fourth color light beam are different.

According to another aspect of the utility model, a projector is provided, which includes a first spatial light modulator, including a light source, a fluorescent wheel, a first light splitting element, a second light splitting element, a fly-eye lens, a first A spatial light modulator, a second spatial light modulator, and a third light splitting element are combined.

The light source can output a first color light beam; in addition, there is a phosphor layer area and an optical action area in the fluorescent wheel, the phosphor layer area can receive the first color light beam and output a second color light beam, and the optical action area The first color light beam can be transmitted or reflected to leave the fluorescent wheel. The first light splitting element is arranged on the traveling path of the first color light beam and the second color light beam, the first light splitting element can reflect part of the second color light beam to form a third color light beam, and can make the second color light beam The other part passes through to form a fourth color light beam. The second light splitting element is arranged on the traveling path of the first color light beam and the second color light beam, and the second light splitting element can reflect any one of the first color light beam and the second color light beam and allow the other to pass through. The fly-eye lens is arranged on the traveling path of the first color light beam and the second color light beam, and is arranged between the light paths of the first light splitting element and the second light splitting element. The first spatial light modulator can receive the first color light beam and the third color light beam and convert them into the first image light beam. The second spatial light modulator can receive the light beam passing through the fourth color and convert it into the second image light beam. The third light splitting element is arranged on the optical path of the first image beam and the second image beam, and can reflect any one of the first image beam and the second image beam and allow the other to pass through.

According to another aspect of the utility model, a projector is provided, which includes a first spatial light modulator, including a light source, a fluorescent wheel, a first light splitting element, a second light splitting element, a fly-eye lens, a first A spatial light modulator, a second spatial light modulator, and a third light splitting element are combined. The light source can output light beams of one color. The fluorescent wheel can be provided with a first area and a second area, the first area can receive the first color light beam and excite and output the two color light beams, and the first color light beam can pass through the second area to continue the light path. The first light splitting element can be arranged on the traveling path of the first color light beam and the second color light beam, and the first light splitting element can convert the second color light beam into a third color light beam and a fourth color light beam with different optical paths. A fly-eye lens can be arranged on the traveling paths of the first color light beam and the third color light beam. The two fly-eye lenses can be arranged on the traveling path of the fourth color light beam. The light valve can be arranged on the traveling path of the first color light beam and the third color light beam, and can convert the first color light beam and the third color light beam into the first image light beam. The second light valve can be arranged on the traveling path of the fourth color light beam, and can convert the fourth color light beam into the second image light beam. And a light-combining optical element can combine the first image light beam and the second image light beam. The color of the first color light beam, the color of the second color light beam, the color of the third color light beam and the color of the fourth color light beam are different.

Compared with the single light valve structure of the present invention, the double light valve design of the present invention can effectively improve the overall brightness. With the use of the fly-eye lens, the overall space requirement of the system can be reduced and the number of required lenses can be reduced, making the system volume smaller. Compared with the three-light-valve structure, the design and production of the present invention are less difficult, and the brightness can achieve an effect close to that of the three-light-valve structure.

The above description is only an overview of the technical solutions of the present utility model. In order to better understand the technical means of the present utility model, it can be implemented according to the contents of the description, and in order to make the above-mentioned and other purposes, features and advantages of the present utility model better It is obvious and easy to understand. The preferred embodiments are specifically cited below, together with the accompanying drawings, and detailed descriptions are as follows.

Description of drawings

FIG. 1 is a schematic diagram of a projector according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a projector according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram of a projector according to a third embodiment of the present invention.

FIG. 4 is a schematic diagram of a projector according to a fourth embodiment of the present invention.

Detailed ways

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed descriptions of multiple embodiments with reference to the drawings. In addition, the terms "first" and "second" used in the following embodiments are used to identify the same or similar elements, and are not used to limit the elements. In addition, the following embodiments only further illustrate the projector, and those skilled in the art can apply the connection system to any desired situation according to actual needs.

The so-called optical element in the present invention means that the element is made of partially or completely reflective or penetrating materials, usually consisting of glass or plastic. The so-called combination of light in the utility model means that more than one light beam can be synthesized into one light beam for output. The so-called lens in the utility model refers to at least allowing part of the light to penetrate, and the radius of curvature of at least one of its entrance and exit surfaces is not infinite; in other words, at least one of the entrance and exit surfaces of the lens needs to be non-planar. For example, flat glass is not the lens referred to in the present utility model.

FIG. 1 depicts a schematic diagram of a projector according to a first embodiment of the present invention. Please refer to FIG. 1 , it can be seen from the figure that the projector mainly includes an illumination device, an imaging device and a projection lens.

The design of the lighting device will be described first below. In this embodiment, the lighting device 10 includes a light source 110, a lens group 120, a light splitting element 130, a lens group 140, a fluorescent wheel 150, a lens group 160, a mirror group 170, a compound eye Lens 180, lens group 190. The imaging device 20 includes a total internal reflection element 210 , a light splitting element 220 and two spatial light modulators 230 , 240 . The lens 30 includes several lenses and an aperture.

The light source 110 of the present invention may be a light emitting diode chip, a laser diode chip, a package of the above two chips, or other light sources that can provide illumination light. In this embodiment, the light source 110 is a laser diode matrix, and the laser diode matrix includes a plurality of laser diode packages 111 capable of emitting blue light. Each laser diode package includes a laser diode chip, optical colloid, and a microlens 111A above the chip. The microlens 111A is used to adjust the light pattern of the light emitted by each corresponding laser package 111 . In addition, the blue light referred to above refers to a light beam, the light beam has a spectrum, and the peak wavelength (WP) in the spectrum is between 400nm and 470nm, and the light beam is substantially blue. In this embodiment, the aforementioned blue light is the first color light beam L1.

The lens group 120 of the present invention is composed of one or more lenses. Besides the lens, the lens group 120 also includes other non-lens elements. In this embodiment, the lens group 120 includes two lenses, and the diopter of each lens is positive and negative according to the order of light travel. The first lens 121 has a positive diopter and is mainly used for light collection. The sum of the diopters of the second lens 122 is negative, and it is mainly used for collimating light, so it can be regarded as a collimating lens.

The spectroscopic element 130 of the present invention refers to bandpass filters, bandstop filters, dichroic filters, dichroic mirrors, and dichroic prisms. (Dichroic prism), X-type light-combining filter group (X Plate), X-type light-combining prism (X Prism) and other elements, or at least one of the foregoing and a combination thereof. In this embodiment, the filter is a Dichroic filter, which can reflect light of a specified wavelength and allow light of another wavelength range to pass through. In this embodiment, the light splitting element 130 reflects blue light and allows yellow light to pass through. In another embodiment, the light splitting element 130 can also reflect yellow light and allow blue light to pass through. In this embodiment, the aforementioned yellow light is the second color light beam L2.

The lens group 140 of the present invention is composed of one or more lenses. Besides the lens, the lens group 120 also includes other non-lens elements. In this embodiment, the sum of the diopters of the lens group 140 is positive, and includes two lenses for converging light to the surface of the fluorescent wheel.

The fluorescent wheel 150 of the present invention refers to a rotatable wheel-shaped optical element with a fluorescent powder layer on its surface. The fluorescent wheel 150 can be transmissive, reflective or a mixture of both. The transmissive fluorescent wheel 150 means that after the phosphor powder on its surface is excited to output the excited light, at least part of the excited light will pass through the fluorescent wheel 150 and output through the opposite surface of the light incident surface, that is, the incident light The direction and the light output direction are consistent. In the reflective fluorescent wheel 150, the excited light will be reflected by the reflective layer of the fluorescent wheel 150, so that the light is output along the direction opposite to the light incident direction. In this embodiment, the fluorescent wheel 150 is a partially transparent fluorescent wheel 150 and partially reflective. In an embodiment, the fluorescent wheel 150 may further include a motor 151 and a base plate connected to the motor 151. The axis of the motor 151 is engaged with the center of the circular base plate and is in interlocking motion. The motor 151 will rotate the axis and drive the base plate. rotate. A phosphor layer region 150A and an optically active region 150B are arranged on the substrate, and the phosphor layer region 150A and the optically active region 150B are combined into a roughly ring shape. The surface of the phosphor layer area 150A on the substrate is provided with a phosphor layer and a reflective layer, the substrate is connected to the phosphor layer through the reflective layer, and the phosphor layer includes at least partially transparent phosphor A mixture of light powder and colloid, which can be excited after accepting a short-wavelength light and output a long-wavelength light. The reflective layer includes a reflective film, such as a silver film or an aluminum film, to reflect light. In addition, in this embodiment, the substrate of the optical active region 150B is at least partially transparent, allowing light of a specific wavelength or characteristic to pass through. In this embodiment, the phosphor layer on the surface of the phosphor layer region 150A can receive blue light and be excited to emit yellow light, and the reflective layer is a silver film. On the other hand, the substrate of the optical active region 150B is transparent, allowing light of any wavelength to pass through. It should be noted that, in the optically active area 150B, in addition to using transparent materials as the transparent area for the substrate, the substrate can also omit the transparent material, and let the light pass directly through the air in the form of openings or gaps in the original position of the transparent material. also can. Incidentally, in the transmissive phosphor wheel 150 , the phosphor layer region 150A does not include a reflective layer, and the substrate is at least partially transparent to allow the excited light to pass through. In addition, in the reflective fluorescent wheel 150 , besides the above-mentioned transparent design, the above-mentioned optical active area 150B can also adopt the above-mentioned design of the reflective layer. That is, in other words, depending on the structure of the fluorescent wheel, the first color beam of blue light will pass through the optical active area 150B or be reflected by the optical active area 150B and leave the fluorescent wheel 150 .

The lens group 160 of the present invention includes one or more lenses. Besides the lens, the lens group 160 also includes other non-lens elements. In this embodiment, the sum of diopters of the lens group 160 is positive, and includes two lenses 161 and 162 for collimating light.

The reflector group 170 of the present invention includes more than two reflectors. In this embodiment, the reflector group 170 sequentially includes a first reflector 171 , a second reflector 172 , a lens 174 and a third reflector 173 according to the traveling path of the light. The first reflector 171 , the second reflector 172 and the third reflector 173 are each a reflector without a wavelength selection function. The included angle between the first reflecting mirror 171 and the second reflecting mirror 172 is about 90 degrees, and the included angle between the second reflecting mirror 172 and the third reflecting mirror 173 is also 90 degrees. In actual application, a lens must be provided between the optical paths of each reflecting mirror, and in this embodiment, a lens 174 is arranged between the optical paths of the second reflecting mirror 172 and the third reflecting mirror 174 to maintain The collimated state of the light.

The surface of the fly-eye lens (FLY-EYE) 180 of the present invention is provided with several optical structures arranged in a matrix. Since the fly-eye lens is already a widely used element, its structure will only be briefly described. According to the material, the material of the fly-eye lens can be made of plastic or glass. According to the process design, the fly-eye lens can be in the form of a single component (ONE PIECE FORMED) or a combination of multiple optical components. In this embodiment, the fly-eye lens is formed by glass molding (MOLDING) and is in the form of a single element for uniformizing light.

The lens group 190 of the present invention includes one or more lenses. Besides the lens, the lens group 190 also includes other non-lens elements. In this embodiment, the lens group 190 includes a lens 191 with a positive diopter.

The so-called total reflection optical element 210 of the utility model refers to an optical element that utilizes total reflection to adjust the optical path. ) group or the combination and modification of the aforementioned two elements. In this embodiment, the total reflection optical element 210 is a total reflection prism group. It should be noted that a single prism group may be composed of several independently arranged and unconnected prisms. In the embodiment, in order to create a total reflection surface, an air gap can be optionally provided between each prism.

The so-called spectroscopic element 220 of the utility model refers to bandpass filters (bandpass filters), bandstop filters (bandstop filters), color filters (Dichroic filter), dichroic mirror (dichroic mirror), dichroic prism (Dichroic prism), X-type light-combining filter group (X Plate), X-type light-combining prism (X Prism) and other optical elements that allow light with specific optical characteristics to pass through or reflect it, or include the aforementioned at least one and combinations thereof. In this embodiment, the filter is a dichroic prism. The wavelength selection interface 221 of the dichroic prism can reflect light of a specified wavelength and allow light of another wavelength range to pass through. In this embodiment, the wavelength selection interface 221 allows the wavelengths of blue light and red light to be reflected, and allows the wavelength of green light to pass. In another embodiment, the filter can also allow the wavelengths corresponding to red light to be reflected and allow light with blue and green wavelengths to pass through. In another example, the transmittance characteristics of the filter for red light and green light can be opposite to those of the previous example, and the present invention does not impose any limitations on this.

The so-called spatial light modulators 230 and 240 (Spatial Light Modulator, SLM) of the present invention include many independent units, which are spatially arranged in a one-dimensional or two-dimensional array. Each unit can be independently controlled by optical or electrical signals, using various physical effects (Pockels effect, Kerr effect, acousto-optic effect, magneto-optic effect, self-electro-optic effect of semiconductors, photorefractive effect) etc.) change its own optical characteristics, thereby modulating the illumination light illuminating the several independent units, and outputting image light. In an embodiment, the so-called spatial light modulator of the present invention is any one of a digital microlens array chip (DMD), a liquid crystal panel (LCD), and a liquid crystal on silicon panel (LCOS). Any one of a digital microlens array (DMD), a liquid crystal panel (LCD), and a liquid crystal on silicon panel (LCOS) can be used as a light valve to convert illumination light into image light. In this embodiment, the spatial light modulator 230 is a digital micromirror device (DMD) and is used as a light valve to convert illumination light into image light. That is, in this embodiment, the so-called independent unit in the spatial light modulator 230 refers to each micro-mirror on its surface, and the micro-mirrors can rotate independently and reflect incident light along a specific angle to form image light.

The so-called lens 30 of the utility model includes a plurality of lenses, and in the present embodiment, the lenses in the lens 30 are composed of ten lenses, that is, the total number of lenses is less than or equal to 10. In another example, the lenses in the lens 30 in this embodiment are composed of 20 lenses, that is, the number of lenses may be less than or equal to 20.

The relative relationship of the aforementioned components will be described below. In this embodiment, the blue laser beam emitted by the light source 110 will first be collimated through the lens group 120 and then reach the light splitting element 130. The optical axes of the light splitting element 130 and the lens group 120 form an angle of about 45 degrees, that is, Its incident angle is about 45 degrees. The light splitting element 130 reflects the blue light and focuses the blue light on the surface of the fluorescent wheel 150 through the lens group 140 .

During this period, the fluorescent wheel 150 continues to rotate, and the blue light will sequentially irradiate different areas on the fluorescent wheel 150 . In this embodiment, the phosphor wheel includes a phosphor layer area 150A and an optical active area 150B. When blue light irradiates the phosphor layer area 150A on the phosphor wheel 150 , the phosphor powder in the phosphor layer area 150A can receive the blue light beam and generate and output a yellow light beam. Part of the yellow light beam will irradiate towards the light splitting element 130, while another part will irradiate toward the reflective layer of the fluorescent wheel 150, but the reflective layer will re-reflect the part of the light to the light splitting element 130 . And when the blue light irradiates the optical active area 150B on the fluorescent wheel 150, since the optical active area is substantially transparent, the blue light will pass through the color wheel 150 and be reflected by the first reflecting mirror of the reflecting mirror group 170 behind it. 171 and the second mirror 172 are sequentially reflected, collimated by the lens 174 , and then reflected by the third mirror 173 to reach the other surface of the light splitting element 130 opposite to the fluorescent wheel 150 and the light source 110 .

The light splitting element 130 reflects the blue light and enters the fly-eye lens 180 . On the other hand, the excited yellow light beam is reflected toward the light splitting element 130 and penetrates into the fly-eye lens 180 . After the blue light and yellow light output from the fly-eye lens 180 , the blue light and yellow light will pass through the lens group 190 for collection and straightening. Then, the blue light beam and the yellow light beam pass through a total reflection prism 210 respectively, and are reflected by the transparent optical interface of the total reflection prism 210 due to the total reflection phenomenon.

Then, the blue light beam and the yellow light beam leave the total reflection prism 210 and enter the light splitting element 220 . There is a wavelength selection interface 221 in the light splitting element 220 . The wavelength selection interface 221 allows the blue light to pass through and partially reflects the red light in the yellow light to form a red and blue light beam; in this embodiment, the aforementioned red light is the third color light beam. At the same time, the wavelength selection interface 221 selects to pass through the green part of the yellow light to form a green light beam. In this embodiment, the aforementioned green light is the fourth color light beam. The red light beam and the blue light beam passing through the wavelength selection interface 221 will enter the spatial light modulator 240 at different timings, and the spatial light modulator 240 will respectively reflect and convert the blue light beam and the red light beam into a blue, Red image beam. Then, the blue and red image beams will pass through the wavelength selection interface 221 of the light splitting element 220 , enter and pass through the total reflection prism 210 . Similarly, when the green light beam passes through the wavelength selection interface 221 of the light splitting element 220, it will enter the spatial light modulator 230, and the spatial light modulator 230 will also convert the green light beam into a green image beam and reflect it, and the green image beam will be It penetrates the wavelength selection interface 221 of the light splitting element 220 and enters and penetrates the total reflection prism 210 . After the blue, red, and green image light passes through the total reflection prism 210, the three-color image light enters the projection lens 30 and is projected as an image. It should be noted that the design of the dual spatial light modulators 230 and 240 in this architecture enables the dual spatial light modulators 230 and 240 to simultaneously and continuously output red light and green image light respectively. In this way, there is no need to waste light of a specific wavelength, so that the overall light efficiency of the system is greatly improved.

The design of the second embodiment of the present invention will be described below. In the following example, only the differences from the first embodiment will be described. In this embodiment, the light output lens group 190 is the same as the previous example. The difference is as follows.

In this embodiment, the projector is provided with a light splitting element 410 , a lens group 470 , a lens group 480 , a prism 420 , a light valve 430 , a prism 440 , a light valve 450 and a light combining optical element 460 behind the optical path of the lens group 190 .

The so-called spectroscopic element 410 of the utility model refers to bandpass filters (bandpass filters), bandstop filters (bandstop filters), color filters (Dichroic filter), dichroic mirror (dichroic mirror), dichroic prism (Dichroic prism), X-type light-combining filter group (X Plate), X-type light-combining prism (X Prism) and other optical elements that can transmit or reflect light with specific optical characteristics, or at least one of the foregoing One and combinations thereof. In this embodiment, the light splitting element 410 is a Dichroic filter. In this embodiment, the light splitting element 410 allows blue and red wavelengths to pass through, and allows green wavelengths to be reflected. In another embodiment, the filter can also allow the wavelengths corresponding to red light to pass through and reflect the light of blue and green wavelengths. In another example, the transmittance characteristics of the light splitting element for red light and green light may be opposite to those of the previous example, and the present invention does not impose any limitations on this.

The so-called lens groups 470 and 480 of the present invention include one or more lenses. In addition to lenses, the lens groups 470, 480 must also include other non-lens elements. In this embodiment, the lens groups 470 and 480 include a positive diopter lens for collimating effect. In another example, the lens groups 470 and 480 are respectively composed of two mutually inclined lenses with positive diopters; and at least one of the two lenses can be an aspheric lens.

The so-called prism 420 and prism 440 in the present invention refer to a group including a total reflection prism (TIR PRISM) group or a reverse total reflection prism (RTIR PRISM) group or a combination and modification of the aforementioned two elements. In this embodiment, the prisms 420 and 440 are a total reflection prism group, that is, they are respectively a type of total reflection optical elements. It should be noted that a single prism group may be composed of several independently arranged and unconnected prisms. In the embodiment, in order to create a total reflection surface, an air gap can be optionally provided between each prism.

The so-called light valves 430 and 450 in the present invention respectively refer to an optical element that can convert illumination light into image light, that is, any one of elements such as a digital micro-reflection chip, a liquid crystal panel, and a silicon-based liquid crystal panel. The light valves 430 and 450 are a digital microreflective chip (DMD) in this embodiment.

The so-called light-combining optical element 460 of the utility model refers to lenses, reflectors, bandpass filters (bandpass filters), bandstop filters (bandstop filters), color filters (Dichroic filter), dichroic mirrors (dichroic mirror), dichroic prism (Dichroic prism), X-type light-combining filter group (X Plate), X-type light-combining prism (X Prism) and other optical elements that allow light with specific optical characteristics to pass through or reflect it, Or comprising at least one of the foregoing and combinations thereof. In this embodiment, the light-combining optical element 460 is a dichroic prism. In this embodiment, the light-combining optical element 460 can reflect the wavelengths of blue light and red light, and allow the wavelength of green light to pass through. In another embodiment, depending on the position of the light valve and the color of the incident light beam, the wavelength corresponding to the red light can also be allowed to pass and the light of the blue and green wavelengths can be reflected. In another example, the transmittance characteristics of the light-combining optical element 460 for red light and green light may be opposite to those of the previous example, which is not limited by the present invention.

The difference from the previous example is that the light passes through a light splitting element 410 after passing through the lens group 190 . In this embodiment, the light splitting element 410 allows the blue light beam and the red light beam to pass through, and reflects the green light beam. After being reflected, the green light beam is collimated by the lens group 480 and then enters the prism 420, and is reflected to the surface of the light valve 430 through the total reflection interface of the prism 420. The light valve 430 converts the green light beam into a green image light beam, passes through and passes through the light-combining optical element 460 and outputs it to the projection lens 30 for projection. On the other hand, the blue light beam and the red light beam passing through the light splitting element 410 will be collimated by the lens group 470 respectively at different times, and then reflected to the surface of the light valve 450 through the total reflection interface of the prism 440, and the light valve 450 Will convert the blue beam and the red beam into a blue and red image beam. The blue and red image beams are reflected to the projection lens 30 through the light-combining optical element 460 for projection.

The design of the third embodiment of the present utility model will be described below. In the following example, only the differences from the second embodiment will be described. In this embodiment, the light splitting element 410 is a dichroic prism. In the second embodiment, when the dichroic mirror is used for light splitting, the larger the angle at which the incident light enters the dichroic mirror, the larger the color shift (ColorShift) will be, resulting in the color control of the entire picture being also reduced. It is difficult. However, in this embodiment, after the dichroic prism is used, when the light hits the incident surface of the prism, the angle at which the light is incident on the central coating layer can be reduced due to the influence of Snell's Law. In addition, in this embodiment, each light exit interface of the dichroic prism is respectively provided with a filter coating corresponding to the color of the passing light beam, so as to further purify the color of the passing light beam.

The design of the fourth embodiment of the present utility model will be described below. In the following example, only the differences from the third embodiment will be described. Compared with the design of the third embodiment in which a single fly-eye lens 180 is placed between the optical path of the spectroscopic element 410 and the optical filter 130, in this embodiment, the aforementioned fly-eye lens 180 is removed and placed on the spectroscopic element 410 , a fly-eye lens 491 is arranged between the optical paths of the lens group 480 and the prism 420; and another fly-eye lens 492 is arranged between the optical paths of the spectroscopic element 410, the lens group 470 and the prism 440 to further improve the uniformity of the light beam .

Compared with the single light valve structure of the present invention, the double light valve design of the present invention can effectively improve the overall brightness. With the use of the fly-eye lens, the overall space requirement of the system can be reduced and the number of required lenses can be reduced, so that the system volume can be smaller. Compared with the three-light-valve structure, the design and production of the present invention are less difficult, and the brightness can achieve an effect close to that of the three-light-valve structure. Although the utility model has been disclosed as above with the embodiments, it is not intended to limit the utility model. Any skilled person in this field can make some changes and modifications without departing from the spirit and scope of the utility model. For example, a lens or other optical elements for adjusting the light type is provided between each optical element, or, for example, in the first embodiment, the fluorescent wheel used can reflect blue light and yellow light in different timings, omitting the subsequent Mirror groups and the like are all available. Therefore, the protection scope of the present utility model should be as defined by the claims.

Claims (10)

1. A kind of 1. projector, it is characterised in that including：

   One light source, exportable one first color beam；

   One fluorescent wheel, equipped with a first area and a second area, the first area can receive first color beam and swash Hair one second color beam of output, first color beam then can continue light path via the second area；

   One fly's-eye lens, on the travel path of first color beam and second color beam；

   One first beam splitter, it is first point described on the travel path of first color beam and second color beam Second color beam can be changed output as light path different a tri-color beam and one the 4th color beam by optical element；

   One first light valve, can be by first color on the travel path of first color beam and the tri-color beam Light beam and the tri-color beam are converted to the first image strip；And

   One second light valve, on the travel path of the 4th color beam, can be converted to the second shadow by the 4th color beam As light beam；And

   One closing light optical element, can be with reference to first image strip and second image strip；

   Wherein, the color of first color beam, the color of second color beam, the color of the tri-color beam and described The color of 4th color beam, is different.
2. 2. projector as claimed in claim 1, it is characterised in that the projector further comprises having：

   One first lens group, has positive diopter, is arranged at first color beam between the fluorescent wheel and the light source Travel path on；

   One second lens group, has positive diopter, is arranged on the travel path of first color beam, second lens group The other end on optical path of the fluorescent wheel relative to first lens group；

   One speculum group, on the travel path of first color beam, the speculum group is arranged on second lens group Relative to the other end on the optical path of the fluorescent wheel；

   One dichronic mirror, on the travel path of first color beam and second color beam, the dichronic mirror can reflect Any one of first color beam and second color beam, and another one can be allowed to penetrate, the dichronic mirror is arranged on the firefly On the optical path of halo and the fly's-eye lens；

   One the 3rd lens group, diopter are the just optical path between the fly's-eye lens and first beam splitter On；

   One the 4th lens group, diopter are just, arranged on first light valve, first beam splitter and the closing light optics On optical path between element；

   One first prism, on the optical path between the 4th lens group and first light valve；

   One the 5th lens group, diopter are just, arranged on second light valve, first beam splitter and the closing light optics On optical path between element；And

   One second prism, on the optical path between the 5th lens group and second light valve.
3. A kind of 3. projector, it is characterised in that including：

   One light source, exportable one first color beam；

   One fluorescent wheel, equipped with a first area and a second area, the first area can receive first color beam and swash Hair one second color beam of output, first color beam then can continue light path via the second area；

   One first beam splitter, it is first point described on the travel path of first color beam and second color beam Second color beam can be changed output as light path different a tri-color beam and one the 4th color beam by optical element；

   One first fly's-eye lens, on the travel path of first color beam and the tri-color beam；

   One second fly's-eye lens, on the travel path of the 4th color beam；

   One first light valve, can be by first color on the travel path of first color beam and the tri-color beam Light beam and the tri-color beam are converted to the first image strip；And

   One second light valve, on the travel path of the 4th color beam, can be converted to the second shadow by the 4th color beam As light beam；And

   One closing light optical element, can be with reference to first image strip and second image strip；

   Wherein, the color of first color beam, the color of second color beam, the color of the tri-color beam and described The color of 4th color beam, is different.
4. 4. projector as claimed in claim 3, it is characterised in that the first fly's-eye lens and the second compound eye through hole with It is positive lens not include diopter between the light path of first beam splitter.
5. 5. such as claim 1-2 any one of them projector, it is characterised in that the closing light optical element is a colour splitting prism An or dichronic mirror.
6. 6. such as claim 1-2 any one of them projector, it is characterised in that first beam splitter is a color separation rib Mirror.
7. 7. such as claim 1-3 any one of them projector, it is characterised in that first light valve and second light valve point Wei not a digital microlens array chip.
8. 8. such as claim 1-3 any one of them projector, it is characterised in that the projector further comprises thering is one second Beam splitter, on the travel path of first color beam and second color beam, second beam splitter can be anti- Any one of first color beam and second color beam are penetrated, and another one can be allowed to penetrate.
9. A kind of 9. projector, it is characterised in that including：

   One light source, exportable one first color beam；

   One fluorescent wheel, has a fluorescent bisque area and an optical effect area, the fluorescent bisque area can receive first coloured light Beam simultaneously exports one second color beam, and the optical effect area can make the first color beam penetrate or be left after reflecting the fluorescent wheel；

   One first beam splitter, it is first point described on the travel path of first color beam and second color beam The part of second color beam can be reflected to form a tri-color beam by optical element, and can allow the another of second color beam Part is penetratingly formed one the 4th color beam；

   One second beam splitter, it is second point described on the travel path of first color beam and second color beam Optical element can reflect any one of first color beam and second color beam, and another one can be allowed to penetrate；

   One fly's-eye lens, on the travel path of first color beam and second color beam, and is arranged at described Between the light path of one beam splitter and second beam splitter is advanced；

   One first spatial light modulator, can receive first color beam and the tri-color beam and be converted to the first image light Beam；

   One second space light modulator, can receive and penetrate the 4th color beam, and be converted to the second image strip；And

   One the 3rd beam splitter, in the light path of first image strip and second image strip, can reflect described Any one of first image strip and second image strip, and another one can be allowed to penetrate.
10. 10. projector as claimed in claim 9, it is characterised in that first spatial light modulator and the second space Light modulator is respectively a digital microlens array chip.