WO2018198709A1

WO2018198709A1 - Light mixing color illumination device

Info

Publication number: WO2018198709A1
Application number: PCT/JP2018/014574
Authority: WO
Inventors: 川村　友人; 拓馬久野; 駿檜山; 寿行高岩; 大地酒井; 黒田　敏裕; 山口　正利; 裕川上
Original assignee: 日立化成株式会社
Priority date: 2017-04-27
Filing date: 2018-04-05
Publication date: 2018-11-01
Also published as: TW201842393A; JP2018186024A

Abstract

An object of the present invention is to provide a light mixing color illumination device capable of efficiently mixing, with a compact configuration, colors of light beams emitted from a multiple-wavelength light source having a plurality of light sources emitting different wavelengths. In order to achieve the above object, there is provided a light mixing color illumination device which mixes colors of light beams of a plurality of wavelengths, the device including: a multiple-wavelength light source having a plurality of light emitting surfaces; a light color mixing unit having a function of mixing colors of a plurality of light beams emitted from the multiple-wavelength light source; and a polarizing film which transmits light with polarization of a predetermined orientation emitted from the light color mixing unit and reflects light with other polarization, wherein the light color mixing unit is a rectangular columnar body formed of a transparent material and is configured to have a function of mixing colors of light beams emitted from the multiple-wavelength light source by internal reflection and a function of converting the orientation of polarization.

Description

Light color lighting device

The present invention relates to a light color mixing illumination device that uniformly mixes light.

Generally, projectors use light sources of three colors, red, green, and blue. For this reason, in the display device, light beams emitted from light sources of three different colors are converted into light beams that are uniformly mixed and used. Further, in a liquid crystal television, since a transmissive liquid crystal display is provided with a color filter, the display is illuminated with a white light source with uniform illuminance.

In order to mix light sources of three colors, red, green, and blue, a microlens array is generally used in combination with a dichroic filter that aligns the optical axis and makes the emitted illuminance uniform. However, with the color mixing technology that combines the dichroic filter and the microlens array, red, green, and blue light can be mixed efficiently. For example, the size is small enough to be mounted on a device that requires downsizing, such as a head-mounted display. There is a problem of growing.

There is Patent Document 1 as background art in this technical field related to this. Patent Document 1 discloses an LED planar light source device capable of reducing the size by efficiently mixing monochromatic light emitted from an LED light source within a light guide plate.

JP 2006-294343 A

Patent Document 1 is suitable for thinning, but does not consider the point of uniformly mixing red, green, and blue light having different light source positions.

An object of the present invention is to provide a light-mixing illumination device that efficiently and uniformly mixes light beams emitted from a plurality of light sources in a small size.

In view of the above-described background art and problems, the present invention is a light-mixing lighting device that mixes light of a plurality of wavelengths, and includes a multi-wavelength light source having a plurality of light emitting surfaces, and a multi-wavelength light source. A light color mixer having a function of mixing a plurality of lights emitted from the light, and a polarizing film that transmits polarized light of a predetermined direction emitted from the light color mixer and reflects light of other polarized light. The color mixer is a rectangular column made of a transparent material, and has a function of mixing light emitted from a plurality of wavelength light sources by internal reflection and a function of converting the direction of polarization.

According to the present invention, it is possible to provide a light color illuminating device that can efficiently mix light beams emitted from a plurality of wavelength light sources in a small size.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a light mixed illumination device in Embodiment 1. 2 is a cross-sectional view of a multiple wavelength light source in Example 1. FIG. It is a figure explaining the color mixture of the light color illumination apparatus in Example 1. FIG. It is a figure explaining the light color mixer in Example 1. FIG. FIG. 3 is a functional block diagram of the light color mixing lighting apparatus according to the first embodiment. It is the schematic of the light color illumination apparatus in Example 2. FIG. It is a figure explaining the color mixture of the light color illumination apparatus in Example 2. FIG. It is a figure explaining the light color mixer in Example 2. FIG. FIG. 6 is a functional block diagram of a light color lighting apparatus according to a second embodiment. FIG. 10 is a schematic diagram of a video projection apparatus in Embodiment 3. FIG. 10 is a functional block diagram of a video projection device in Embodiment 3. It is the schematic of the 1st modification of the light color mixing illuminating device in Example 4. FIG. It is the schematic of the 2nd modification of the light color mixing illuminating device in Example 4. FIG. It is the schematic of the 3rd modification of the light color mixing illuminating device in Example 4. FIG. It is the schematic of the 4th modification of the light color mixing illuminating device in Example 4. FIG. FIG. 10 is a schematic view of a light color mixing lighting apparatus according to a fifth embodiment. FIG. 10 is a schematic diagram of a light color mixing unit in Example 5. 10 is a schematic diagram of a multiple wavelength light source in Example 5. FIG. FIG. 11 is a functional block diagram of a light color mixing lighting apparatus according to a fifth embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic diagram of a light color mixing lighting apparatus in the present embodiment. 1, FIG. 1 (B) is a cross-sectional view seen from the top surface of the light-mixed lighting device 1, and FIG. 1 (A) is a side cross-sectional view seen from AA in FIG. 1 (B). Moreover, FIG.1 (C) is the perspective view seen from the polarizing film 4 side of FIG. 1 (A), (B). As shown in FIG. 1, the light-mixing lighting device 1 is mainly composed of a multi-wavelength light source 2, a light-coloring device 3, a polarizing film 4, and a housing 5.

In FIG. 1, a multiple wavelength light source 2 is a light source that emits light having at least two wavelengths. Here, a light emitting surface 6 that emits light having a red wavelength and light emission that emits light having a green wavelength. Assume an LED (Light Emitting Diode) in which three light emitting surfaces, a surface 7 and a light emitting surface 8 that emits light of blue wavelength, are arranged in a housing. The

light emitting surfaces

6, 7, and 8 are arranged in a line, and the direction of the arrangement is arranged in a direction perpendicular to the longitudinal direction of the light color mixer 3 (the horizontal direction of the cross section in FIG. 1A). . In addition, it is desirable to select the area | region which contacts the light color mixer 3 other than the light emission surface of LED with the structure covered with a highly reflective material. For example, NSSM124, which is an LED manufactured by Nichia Corporation, is applicable.

The light color mixer 3 is formed of a transparent material, is a rectangular column having short sides in the parallel direction of the

emission surfaces

6, 7, 8 of the multiple wavelength light source 2, and has a plurality of wavelengths emitted from the multiple wavelength light source 2. It has a function to mix the colors of light. All surfaces of the rectangular column are preferably mirror surfaces having a surface roughness Ra of 0.5 μm or less. The light color mixer 3 has a function of changing the direction of polarization of the traveling light. The function of changing the direction of polarization can be realized by using anisotropic materials having different refractive indexes for vertically polarized light and horizontally polarized light. For example, it is possible to give anisotropy to the internal refractive index by applying a predetermined pressure or temperature from one or more points to a transparent rectangular column. Further, each surface may be distorted so as to have a function of rotating polarized light when light is reflected by each surface.

The polarizing film 4 is assumed to be a general polarizing film that transmits light having a predetermined polarization and reflects light having a polarization orthogonal to the polarization. Here, for the sake of convenience, if the polarized light of the transmitted light is denoted as P-polarized light and the polarized light of the reflected light is denoted as S-polarized light, the polarizing film 4 transmits the P-polarized light out of the light emitted from the optical color mixer 3. , S-polarized light is reflected and returned to the light color mixer 3. In addition, it is good to select the polarizing film 4 with little absorption. For example, a wire grid film is desirable. Further, the polarizing film 24 may be DBEF (Dual Brightness Enhancement Flim) having the function of adjusting the emission angle distribution of the emitted light and the function of the polarizing film.

The housing 5 is a housing formed of a highly reflective material. For example, when a white polycarbonate, a resin such as white silicone, or a metal such as aluminum is used as a material, a high reflectance can be obtained. In order to increase the reflectance on the inner side of the housing 5, it is desirable that each inner surface constitutes a reflecting surface having a mirror surface with a surface roughness Ra of 0.5 μm or less. The housing 5 has a function of returning light leaking from the light color mixer 3 back to the light color mixer 3 by reflection.

The light-mixing illumination device 1 uniformly mixes light emitted from the multiple-wavelength light source 2 with the light-coloring device 3 to eliminate color unevenness, and the P-polarized light with the polarizing film 4 is outlined in FIG. It has a function of emitting light in the direction of the arrow. Further, the light color illuminating device 1 has a recycling function in which light that does not travel in the direction of the arrow by the light color mixer 3 and leaks to the housing 5 side is reflected inside the housing 5 and returned to the light color mixer 3. ing. Further, the light-mixed illumination device 1 emits the S-polarized light reflected by the polarizing film 4 from the polarizing film 4 by converting the S-polarized light into P-polarized light through the light color mixer 3, the housing 5, and the multiple wavelength light source 2. It also has a polarization recycling function.

The light color mixer 3 is inserted from the polarizing film 4 side, and the polarizing film 4 and the housing 5 are fixed with an adhesive or the like, so that the light color mixer 3 can be fixed without using an adhesive or the like. can get. This is because if an adhesive is used to fix the light color mixer 3, light is absorbed by the adhesive and becomes a loss.

The configuration of the multiple wavelength light source 2 will be described with reference to FIG. FIG. 2 is a view of the multi-wavelength light source 2 as viewed from the light color mixer 3 side. As shown in FIG. 2, the multi-wavelength light source 2 is an LED in which the

light emitting surfaces

6, 7, and 8 are arranged in a housing as described above. Regions other than the

light emitting surfaces

6, 7 and 8 (shaded portions in the figure) are covered with a material having a high light reflectance. Further, the

light emitting surfaces

6, 7, and 8 are arranged in a vertical line on the paper surface, and the arrangement direction is arranged in a direction orthogonal to the longitudinal direction of the light color mixer 3. Further, the overall outer shape of the plurality of light emitting

surfaces

6, 7, 8 has different aspect ratios. The incident surface of the light color mixer 3 is indicated by a broken line. Usually, the light emitting surface of the LED has an effect of reflecting light, and this effect also contributes to the recycling function described above.

FIG. 3 is a diagram for explaining the color mixture of light of the light-mixed lighting device 1. 3, FIG. 3 (B) is a cross-sectional view seen from the top surface of the light-mixed lighting device 1, and FIG. 3 (A) is a side cross-sectional view seen from AA in FIG. 3 (B). Further, the traveling direction of light is shown by arrows.

As shown in FIG. 3, the light emitted from the multiple wavelength light source 2 enters the light color mixer 3. The light incident on the light color mixer 3 is repeatedly reflected on the inner surface of the light color mixer 3 and emitted from the polarizing film 4 (arrow indicated by a solid line). At this time, the short side direction of the rectangular shape of the light color mixer 3 shown in FIG. On the other hand, the longitudinal direction of the rectangular shape of the light color mixer 3 shown in FIG.

Incidentally, the internal reflection by the light color mixer 3 is based on the total reflection condition according to Snell's law. Light rays that do not satisfy the total reflection condition once exit the light color mixer 3, but are reflected by the housing 5, returned to the light color mixer 3, and recycled.

General light pipe is an element that mixes and equalizes light using the reflection of the internal reflection. The light color mixer of this embodiment also uses internal reflection to mix and equalize light.

In the light color mixer 3 of the present embodiment, the arrangement of the light emitting surfaces of the multiple wavelength light sources 2 is arranged in parallel in the short side direction where the number of reflections is large.

The P-polarized light is emitted from the polarizing film 4 as described above, while the S-polarized light is reflected by the polarizing film 4. The reflected light beam is indicated by a broken line. After the S-polarized light is reflected by the polarizing film 4, it proceeds while being reflected inside the light color mixer 3, and is emitted from the light color mixer 3. The emitted light is reflected by the housing 5, then enters the light color mixer 3 again, travels while being reflected, and reaches the polarizing film 4 again. As described above, since the light color mixer 3 has a function of changing the direction of polarization of the traveling light, a part of the S-polarized light is converted to P-polarized light by traveling the light color mixer 3. Converted. The light converted to P-polarized light exits the polarizing film 4. The S-polarized light is reflected from the polarizing film 4 and travels inside until converted to P-polarized light and emitted as described above.

As described above, the light-mixing lighting device 1 has a polarization recycling function, and an effect of efficiently emitting light emitted from the multiple wavelength light source 2 from the polarizing film 4 is obtained.

In order to maximize the recycling function as described above, it is desirable that the gap between the multi-wavelength light source 2 and the housing 5 surrounded by a broken-line circle in the figure be as small as possible. The gap is filled with an adhesive or the like, and the multiple wavelength light source 2 is fixed to the housing 5. If the adhesive has a high reflectance, the effect of the recycling function is enhanced. In order to maximize the recycling function, a white paint having a high reflectance may be applied to the optical color mixer 3 side of the adhesive.

FIG. 4 illustrates a modification of the light color mixer 3. In FIG. 4, the optical color mixer 3 shown in FIG. 4A is a rectangular column made of a transparent material as described above, and has a refractive index different from that of P-polarized light and S-polarized light. Isotropic material. For example, transparent polycarbonate may be used as an anisotropic material.

The light color mixer 9 shown in FIG. 4B has a rectangular column shape. The light color mixer 9 is made of a transparent material having a refractive index N1, and particles 10 that scatter light are arranged inside. The surfaces are all preferably mirror surfaces having a surface roughness Ra of 0.5 μm or less.

The particle 10 is formed of a transparent material having N2 different from the refractive index N1. Since the particles 10 are filled, the light color mixer 9 has a scattering function due to the difference in refractive index between the refractive indexes N1 and N2. When the incident light is visible light (400 to 700 nm), the particle 10 is desirably about 1 to 5 μm in diameter. This is because if the diameter is too small with respect to the wavelength of light, the light scattering angle becomes large, and conversely if too large, the scattering angle is too small.

As the base transparent material, for example, Hitachi Chemical 9501 may be used. This is a urethane acrylate-based photocurable resin, and its refractive index is 1.49 at a wavelength of 550 nm. Further, as the material of the particles 10, Sekisui Plastics Co., Ltd. Techpolymer SSX-302ABE may be used. This is a particle made of a cross-linked polystyrene resin. When the wavelength is 550 nm, the refractive index is 1.59, the shape is spherical, the average diameter is 2 μm, and approximately 95% of the particles are within the average diameter and 0.5 μm. Monodisperse particles that are the difference.

It can be produced by mixing Sekisui Chemicals Co., Ltd. Techpolymer SSX-302ABE, stirring, and then curing in a mold before curing Hitachiitai 9501 manufactured by Hitachi Chemical Co., Ltd.

The light mixer 9 can change the direction of polarized light by changing the traveling direction of light. Further, since the effect of being mixed not only by the internal color reflection but also by the scattering while the light is kept inside the light color mixer 9 is obtained, the light color mixer 9 is more suitable than the light color mixer 3 in order to obtain a sufficient color mixing effect. Can be reduced in size.

The light color mixer 11 shown in FIG. 4C is composed of a rectangular columnar particle portion 12 and a transparent portion 13. The particle portion 12 of the light color mixer 11 is formed of a transparent material having a refractive index N1, and the particles 10 that scatter light are disposed therein. The transparent portion 13 is formed of a transparent material having a refractive index N1. The surfaces of the particle part 12 and the transparent part 13 are all preferably mirror surfaces having a surface roughness Ra of 0.5 μm or less.

The light color mixer 11 can also change the direction of polarization by changing the traveling direction of light.

内面 Inside reflection, a reflectivity of 100% is obtained, but the reflectivity of the housing 5 cannot be 100%, and a slight absorption occurs. When the particles 10 are filled entirely like the light color mixer 9, light is emitted from the side surface, and the number of paths that are recycled in the housing increases, so that light loss increases. For this reason, if the number of particle portions is reduced as in the light color mixer 11, the efficiency can be improved as compared with the light color mixer 9. Further, like the light color mixer 9, there is an effect of downsizing.

Further, by disposing the particle part 12 far from the light source, useless scattering by the particles 10 can be eliminated. That is, after the color is mixed by the transparent part 13, the influence of the light emitted from the side surface of the housing by the particles 10 of the particle part 12 can be reduced by mixing the colors by the particle part 12.

FIG. 5 is a functional block diagram of the light-mixed lighting device 1. In FIG. 5, when power is supplied to the multiple wavelength light source 2 from the power supply 15 disposed outside, red, green, and blue light are emitted from the

light emitting surfaces

6, 7, and 8. The emitted light is incident on the light color mixer 3. Light incident on the light color mixer 3 is mixed. A part of the P-polarized light mixed by the light color mixer 3 passes through the polarizing film 4 and is emitted and output to the outside. A part of the S-polarized light is reflected by the polarizing film 4 and returned to the light color mixer 3 for recycling.

A part of the P-polarized light or S-polarized light that has entered the light color mixer 3 and mixed is returned to the multi-wavelength light source 2. The light that has returned to the multi-wavelength light source 2 is reflected by the emission surface of the multi-wavelength light source 2 or other regions, and then enters the light color mixer 3 again and is recycled.

In addition, a part of the P-polarized light and S-polarized light that has entered and mixed into the light color mixer 3 travels to the housing 5. The light that has traveled to the housing 5 is reflected by the inner surface of the housing 5, enters the light color mixer 3 again, and is recycled.

As described above, the light emitted from the multi-wavelength light source 2 is converted into P-polarized light through various optical paths via the light color mixer 3 and emitted from the polarizing film 4.

Thereby, it is possible to provide a light color mixing illumination device that can efficiently mix light beams emitted from a plurality of wavelength light sources in a small size.

In this embodiment, a modified example of the light color mixing lighting device will be described.

FIG. 6 is a schematic view of the light color mixing lighting apparatus in the present embodiment. 6B, FIG. 6B is a front view of the light-mixing lighting device 21, and FIG. 6A is a side cross-sectional view as seen from AA in FIG. 6B. FIG. 6C is a perspective view seen from the front.

The light-mixing illumination device 21 is mainly composed of a multi-wavelength light source 2, a light-coloring device 23, a polarizing film 24, and a housing 25.

The light color mixer 23 has a function of mixing light and a function of rotating polarized light in the same manner as the light color mixer 3 of the first embodiment. Similarly to the light color mixer 3, the light color mixer 23 has a rectangular column shape with a short side parallel to the arrangement of the

light emitting surfaces

6, 7, 8 of the multiple wavelength light source 2.

The polarizing film 24 has a function of transmitting P-polarized light and reflecting S-polarized light, like the polarizing film 4 of Example 1.

The housing 25 is a housing formed of a highly reflective material, like the housing 5 of the first embodiment. Moreover, in order to increase the reflectance on the inner side of the casing 25 as in the case of the casing 5, it is desirable that each inner surface be a mirror surface having a surface roughness Ra of 0.5 μm or less. Similarly to the housing 5, the housing 25 also has a function of returning light leaking from the light color mixer 23 back to the light color mixer 3 by reflection.

Unlike the housing 5, the housing 25 includes a reflector surface 29. The reflector surface 29 has a function of bending the light emitted from the light color mixer 23 in the direction of the polarizing film 24. The casing 25 includes tunnel-type reflection surfaces 86 and 87 up to the emission surface, and the reflection surfaces 86 and 87 have a function of reflecting light.

Further, a part of the reflector surface 29 (a region surrounded by a broken line in FIG. 6A) is brought into contact with the light color mixer 23 by slightly changing the angle. Thus, the light color mixer 23 is inserted from the lower side of the paper, and the multiple wavelength light source 2 is fixed to the casing, so that the light color mixer 23 can be fixed without using an adhesive.

The light-mixing illumination device 21 uniformly mixes the light emitted from the multiple-wavelength light source 2 with the light-coloring device 23 to eliminate color unevenness, changes the direction of the light with the reflector surface 29 of the housing 25, and the polarizing film 24. And has the function of emitting P-polarized light in the direction of the arrow. Further, the light color mixing lighting device 21 has a recycling function in which light leaking from the light color mixer 23 toward the housing 25 is reflected inside the housing 25 and returned to the light color mixer 23. In addition, the light-mixing illumination device 21 reflects the S-polarized light reflected by the polarizing film 24 on the inner surface of the housing 25 such as the reflector surface 29, so that the P-polarized light passes through the light color mixer 23 and the multiple wavelength light source 2. It also has a polarization recycling function of emitting light from the polarizing film 24 by converting it into light.

FIG. 7 is a diagram for explaining light color mixing of the light color mixing illumination device 21 in the present embodiment. FIG. 7 is a cross-sectional view corresponding to FIG. 6A, in which the traveling direction of light is indicated by arrows.

7, the light emitted from the multi-wavelength light source 2 is reflected from the inner surface of the light color mixer 23 and emitted from the light color mixer 23 as indicated by the solid line arrows. The light emitted from the light color mixer 23 is reflected by a surface such as the reflector surface 29 of the housing 25 and enters the polarizing film 24. The P-polarized light incident on the polarizing film 24 exits the polarizing film 24. The S-polarized light incident on the polarizing film 24 is reflected by the polarizing film 24 and reflected by the reflector surface 29 as indicated by the dashed arrow, and enters the light color mixer 23. The light incident on the light color mixer 23 is once reflected by the multiple wavelength light source 2 and then emitted from the light color mixer 23 again. In this optical path, part of the S-polarized light is converted to P-polarized light. The light emitted from the light color mixer 23 is reflected by the reflector surface 29, and then the P-polarized light is emitted from the polarizing film 24. The S-polarized light is reflected again and repeatedly travels through the casing 25 and the light color mixer 23 and the multiple wavelength light source 2, and then converted into P-polarized light and emitted from the polarizing film 24 to the outside. As described above, the light-mixed illumination device 21 also has a polarization recycling function.

Further, the light color mixer 23 has a rectangular column shape with a short side parallel to the arrangement of the

light emitting surfaces

6, 7, and 8 of the multi-wavelength light source 2, so that it is easy to mix colors with much reflection. It has become.

FIG. 8 is a diagram for explaining an optical color mixer in the present embodiment. In FIG. 8, the

light color mixers

23, 31, and 37 shown in FIGS. 8A, 8B, and 8C are the light color mixers described in FIGS. 4A, 4B, and 4C. The material is the same as 3, 9, and 11, and the particle part 38 and the transparent part 39 are also the same as the particle part 12 and the transparent part 13, and the description thereof is omitted.

FIG. 9 is a functional block diagram of the light-mixing lighting device 21 in the present embodiment. In FIG. 9, when power is supplied to the multiple wavelength light source 2 from the power supply 15 disposed outside, red, green, and blue light are emitted from the

light emitting surfaces

6, 7, and 8. The emitted light is incident on the light color mixer 23. Light incident on the light color mixer 23 is mixed. The light mixed by the light color mixer 23 is branched into light that returns to the multi-wavelength light source 2 and is recycled and light that travels to the housing 25. The light that has traveled to the housing 25 is reflected by the inner surface thereof, so that it is split into light that travels to the color mixer 23 and is recycled and light that travels to the polarizing film 24. The P-polarized light that has traveled to the polarizing film 24 is emitted and output to the outside. The S-polarized light that has traveled to the polarizing film 24 travels to the housing 25 and is recycled.

As described above, the light emitted from the multi-wavelength light source 2 is converted into P-polarized light through various optical paths via the light color mixer 23 and the housing 25 and is emitted from the polarizing film 24.

In addition, a diffusion film that diffuses light for adjusting the emission angle distribution may be provided at the tip of the polarizing film 24 that is the emission surface of the housing so as to obtain an emission angle distribution suitable for the illuminated optical system. Good.

In this embodiment, a video projection apparatus will be described.
FIG. 10 is a schematic diagram of a video projection apparatus in the present embodiment. FIG. 10 is a cross-sectional view showing the video projection device 30, and the video projection device 30 mainly includes a light color illuminating device 21, a display device 32, a polarizing film 33, and a projection lens 34.

In FIG. 10, the display device 32 is assumed to be a transmissive liquid crystal. The transmissive liquid crystal is a general device that generates an image using polarized light. Note that a polarizing film 33 is attached to the display device 32 so that video light is transmitted but light that is not video is not transmitted.

The projection lens 34 is a general optical element having a lens function for projecting an image generated by the display device 32 to the outside.

The P-polarized light emitted from the light-mixing illumination device 21 is incident on the display device 32, the image light is converted to S-polarized light, and the non-image light is reflected by the polarizing film 33 while remaining as P-polarized light. The image light is projected as an image to the outside by the projection lens 34.

As described above, the video projection device 30 can generate a bright video in a small size, and can be used for a pico projector, a head mounted display, or the like.

Note that here, transmissive liquid crystal is applied as the display device 32, but reflective liquid crystal may be used.

FIG. 11 is a functional block diagram of the video projection device 30 in the present embodiment. In FIG. 11, the functional blocks of the video projection device 30 are composed of a power supply 15, a controller 35, a video processing circuit 36, a light color mixing illumination device 21, a display device 32, a polarizing film 33 (not shown), and a projection lens 34. .

The controller 35 is a circuit that controls the video projection device 30, and the video processing circuit 36 is a circuit that drives the display device 32.

When information is input from the outside, the controller 35 drives the power supply 15 and the video processing circuit 36. The controller 35 transmits necessary video information to the video processing circuit 36 and simultaneously transmits drive information for driving the multiple wavelength light sources 2 to the power supply 15.

The power supply 15 is turned on so that a predetermined amount of light is emitted alternately from the

light emitting surfaces

6, 7, and 8 in the multiple wavelength light source 2.

The video processing circuit 36 drives the display device 32 in synchronism with the lighting of the

light emitting surfaces

6, 7, 8.

The light emitted from the

light emitting surfaces

6, 7, and 8 in the multiple wavelength light source 2 is mixed with the light color lighting device 21 and illuminated on the display device 32. The image generated by the display device 32 is projected to the outside by the projection lens 34.

In this embodiment, a modified example of the light-mixed lighting device will be described.

FIG. 12 is a schematic view of a first modification of the light color mixing lighting apparatus in the present embodiment. FIG. 12 is a cross-sectional view of the light color illuminating device 41, which differs from the case 25 of the light color mixed illuminating device 21 of FIG. 6A of Example 2 in that the reflector surface 49 of the case 44 is a parabola. Yes.

The reflector surface 49 is a paraboloid focusing on the center of the exit surface of the light color mixer 23. Since the reflector surface 49 is a parabolic surface, it has a function of improving directivity and improving efficiency, compared to a simple reflecting surface. The efficiency is improved by making the exit surface size of the housing 44 that emits the light reflected by the reflector surface through the polarizing film 24 larger than the exit surface of the light color mixer 3.

FIG. 13 is a schematic diagram of a second modification of the light-mixed lighting device in the present embodiment. In FIG. 13, FIG. 13B is a front view of the light-mixed lighting device 51, and FIG. 13A is a side cross-sectional view as seen from AA in FIG. 13B. The light mixed illumination device 51 is different from the case 25 of the light mixed illumination device 21 of FIG. 6 of the second embodiment in that a cylindrical reflector surface 60 is added to a part of the reflector surface 59.

The reflector surface 60 has a function of reflecting the light in the central region emitted from the light color mixer 23 to the outside as indicated by the arrows. The effect of improving the uniformity of the polarizing film 24 is obtained. In addition, since it has the function to reflect light in the direction of the arrow, it may have a triangular shape instead of a cylindrical shape.

FIG. 14 is a schematic diagram of a third modification of the light color mixing lighting apparatus in the present embodiment. In FIG. 14, FIG. 14B is a front view of the light-mixed illumination device 71, and FIG. 14A is a side sectional view as seen from AA in FIG. 14B. The light color mixing lighting device 71 is different from the light color mixing device 23 of the light color mixing lighting device 21 in FIG. 6 in that the light color mixing device 73 has a trapezoidal shape. In addition, since the shape of the light color mixer 73 is a trapezoidal shape, the shape of the housing 72 is also changed accordingly.

By adopting a trapezoidal shape, it is easy to spread light in a direction orthogonal to the arrangement of the multiple wavelength light sources 2 and it is possible to secure a capture range of light emitted from the multiple wavelength light sources 2. Further, compared with the light color mixer 23 shown in FIG. 6 of the second embodiment, the direction orthogonal to the arrangement of the multiple wavelength light sources 2 is narrow, so that the number of reflections due to internal reflection increases and the color mixing is easy. .

FIG. 15 is a schematic view of a fourth modification of the light color mixing lighting apparatus in the present embodiment. In FIG. 15, FIG. 15B is a front view of the light-mixed lighting device 81, and FIG. 15A is a side cross-sectional view as seen from AA in FIG. 15B. The light-mixing lighting device 81 is implemented by separating the light-coloring device 83 into a particle portion 84 and a transparent portion 85, and making the particle portion 84 larger than the transparent portion 85 in a direction orthogonal to the arrangement of the multiple wavelength light sources 2. This is different from the light color mixer 23 of the light color lighting apparatus 21 shown in FIG.

As in the light color mixer 83, by making the transparent portion 85 smaller than the particle portion 84, the number of times the light emitted from the multi-wavelength light source 2 is reflected by the transparent portion 85 increases. is doing.

In the present embodiment, the reflector surfaces 29 and 59 are a reflection surface that is 45 degrees perpendicular to the paper surface in the figure, but may be changed to 50 degrees.

The polarizing film 24 is arranged in parallel with the direction perpendicular to the paper surface, but an angle may be given.

Further, although the reflection surfaces 86 and 87 of the casing 82 are arranged in parallel with the horizontal direction on the paper surface, an angle may be given. Needless to say, the angle may be set not only to be parallel but also to spread toward the polarizing film 24.

FIG. 16 is a schematic diagram of the light color mixing lighting apparatus in the present embodiment. FIG. 16 shows a cross section of the light-mixing lighting device 101, and the light-mixing lighting device 101 includes a light-mixing unit 91 and an illumination lens 102.

In FIG. 16, the light color mixing portion 91 has a function of uniformly emitting light having a plurality of wavelengths. The illumination lens 102 has a lens function of illuminating a predetermined region with uniform light of a plurality of wavelengths emitted from the light color mixing unit 91 with increased directivity.

FIG. 17 is a schematic diagram of the light color mixing portion 91 in the present embodiment. 17A is a sectional view of the light color mixing portion 91, and FIG. 17B is a perspective view. The light color mixing unit 91 mainly includes a multiple wavelength light source 92, a light color mixer 93, a polarizing film 94, and a housing 95.

The multi-wavelength light source 92 is a light source that emits light having at least two wavelengths. Here, the light emitting surface 6 that emits light having a red wavelength and the light emitting surface 7 that emits light having a green wavelength are divided into two. It is assumed that the LED has four light emitting surfaces, i.e., a light emitting surface 8 that emits light having a blue wavelength, arranged in a housing. Further, the light emitting surface is arranged to form a quadrangle as shown in FIG. In addition, it is possible to select an area (shaded area in FIG. 19) that is in contact with the light color mixer 93 (illustrated by a broken line in FIG. 19) other than the light emitting surface of the LED so as to cover with a highly reflective material. desirable.

In FIG. 17, the light color mixer 93 includes a particle portion 96 and a transparent portion 97. Since the particle part 96 and the transparent part 97 have the same configuration as that of FIG. 4C of the first embodiment, description thereof is omitted. Moreover, since the polarizing film 94 is also the same as the polarizing film 4 of Example 1, the description is abbreviate | omitted. The casing 95 has a tunnel-like shape, and the material thereof is the same as that of the casing 5 of the first embodiment, so that the description thereof is omitted.

The light-mixing illumination device 101 has a function of uniformly mixing the light emitted from the multiple wavelength light source 92 with the light color mixer 93 to eliminate color unevenness, and emitting P-polarized light in the direction of the arrow with the polarizing film 94. is doing. The light color mixing lighting device 101 has a recycling function in which light that does not travel in the direction of the arrow in the light color mixer 3 and leaks to the housing 95 side is reflected inside the housing 95 and returned to the light color mixer 93. ing. Further, the light-mixing illumination device 101 converts the S-polarized light reflected by the polarizing film 94 into P-polarized light through the light-coloring device 93, the housing 95, and the multi-wavelength light source 92 to be emitted from the polarizing film 4. It also has a polarization recycling function. In addition, the light-mixing lighting device 101 has a function of illuminating light with a directivity in a predetermined region with the illumination lens 102. That is, it has a function of increasing efficiency by illuminating the display device with light that increases directivity.

FIG. 19 is a functional block diagram of the light color mixing lighting apparatus 101 in the present embodiment. In FIG. 19, when power is supplied from the power supply 15 disposed outside to the multiple wavelength light source 92, red, green, and blue light is emitted from the

light emitting surfaces

6, 7, and 8. The emitted light enters the light color mixer 93. Light incident on the light color mixer 93 is mixed. A part of the P-polarized light mixed by the light color mixer 93 is transmitted through the polarizing film 94, the directivity is enhanced by the illumination lens 102, and is emitted and output to the outside. A part of the S-polarized light is reflected by the polarizing film 94 and returned to the light color mixer 93 for recycling.

A part of the P-polarized light or S-polarized light that has entered the light color mixer 93 and mixed is returned to the multi-wavelength light source 92. The light that has returned to the multi-wavelength light source 92 is reflected by the emission surface of the multi-wavelength light source 92 or other region, and then enters the light color mixer 93 again and is recycled.

In addition, a part of the P-polarized light and S-polarized light that has entered and mixed into the light color mixer 93 travels to the housing 95. The light that has traveled to the housing 95 is reflected by the inner surface of the housing 95, enters the light color mixer 93 again, and is recycled.

As described above, the light emitted from the multi-wavelength light source 92 is converted into P-polarized light through various optical paths via the light color mixer 93 and is emitted from the polarizing film 94. The light mixed illumination device 101 has a function of enhancing the directivity of light emitted from the polarizing film 94 with the illumination lens 102 and efficiently illuminating a predetermined region.

In the present embodiment, the multi-wavelength light source 92 having two light emitting surfaces 7 for emitting green light has been described. Of course, it may emit light of four different wavelengths. The

light emitting surfaces

6, 7, and 8 have the same size, but may have different sizes. When the outermost shape of the light emitting surface differs vertically and horizontally, the longitudinal direction of the light emitting surface and the longitudinal direction of the incident surface of the light color mixer are orthogonal to each other, so that light can be easily mixed.

As described above, the light-mixed illumination device of the present invention has a plurality of light sources having at least two light emitting surfaces (for example, a plurality of wavelength light sources 2 and 92) and a plurality of lights emitted from the plurality of wavelength light sources. A light color mixer having a function of mixing colors (for example,

light color mixers

3, 9, 11, 23, 31, 37, 73, 83, 93) and a light beam polarized in a predetermined direction emitted from the light color mixer. And a polarizing film (for example, polarizing

films

4, 24, 33, 94) that reflects other polarized light, and the light color mixer is a rectangular column made of a transparent material, and is a multiple wavelength light source It has a function of mixing the light emitted from the light by internal reflection and a function of changing the direction of polarization.

Further, in the light mixed illumination device (1, 21, 41, 51), the outermost shapes of the plurality of light emitting

surfaces

6, 7, 8 of the multiple wavelength light source 2 have different aspect ratios, and a plurality of lights emitted from the multiple wavelength light source 2 are used. The longitudinal direction of the incident surface of the light color mixer (for example, the

light color mixer

3, 9, 11, 23, 31, 37, 73, 83) on which the light enters is substantially orthogonal to the longitudinal direction of the light emitting surface of the multiple wavelength light source 2 Are arranged.

A particle 10 made of a transparent material having a refractive index different from that of the transparent material is provided inside the light color mixer (for example, the

light color mixer

9, 11, 31, 37, 83, 93).

The density of the particles provided inside the light color mixer (for example, the

light color mixer

11, 37, 83, 93) is varied.

The density of the particles provided in the light color mixer (for example, the

light color mixers

11, 37, 83, 93) is higher on the side farther from the multiple wavelength light source.

The light color mixer (for example, the

light color mixer

11, 37, 83, 93) is a transparent portion (for example, the

transparent portions

13, 39, 85, 97) made of a transparent material and a transparent material having a refractive index different from the material of the transparent portion. Particle portions (for example,

particle portions

12, 38, 84, and 96) provided with particles formed of a material, and light emitted from a plurality of wavelength light sources is in the order of the transparent portion and the particle portion of the light color mixer. proceed.

The light color mixer includes an emission surface that emits light, and a reflection surface that reflects light is provided outside the incident surface and the side surface other than the emission surface of the light color mixer. For example, it is the inner surface of the

casing

5, 25, 44, 55, 72, 82, 95.

Further, a reflector surface (for example, reflector surfaces 29, 49, 59, 60) for bending the light emitted from the emission surface of the light color mixer in a substantially orthogonal direction is disposed.

The housing has an exit surface that emits light bent by the reflector surface, and the exit surface of the housing is made larger than the exit surface of the optical color mixer.

The housing has a tunnel-type side surface from the reflector surface to the exit surface of the housing, and the side surface has a function of reflecting light. For example, the inner surfaces of the

casings

25, 44, 55, 72, and 82.

A diffusion film that diffuses light may be provided on the exit surface of the housing. For example, it is arranged before and after the polarizing film 24. In this case, the directivity of the light to be illuminated and the emission angle distribution can be converted.

A polarizing film (for example, a polarizing film 24) that transmits light of a predetermined polarization and reflects other polarized light is disposed on the exit surface of the reflector surface (for example, the reflector surfaces 29, 49, 59, and 60). Yes.

Although the embodiments have been described above, the present invention is not limited to the above-described embodiments, and includes various modifications. For example, it is possible to add, delete, or replace other configurations for a part of the configuration of the embodiment.

1, 21, 41, 51, 101: Light color mixing illumination device, 2, 92: Multiple wavelength light source, 3, 9, 11, 23, 31, 37, 73, 83, 93: Light color mixer, 4, 24, 33 94: Polarizing

film

5, 25, 44, 55, 72, 82, 95: Housing, 10: Particle, 12, 38, 84, 96: Particle part, 13, 39, 85, 97: Transparent part, 30 : Video projection device, 32: Display device, 34: Projection lens, 91: Light color mixing part, 102: Illumination lens

Claims

A light-mixing lighting device that mixes light of a plurality of wavelengths,
A multi-wavelength light source having a plurality of light emitting surfaces;
A light color mixer having a function of mixing a plurality of lights emitted from the plurality of wavelength light sources;
Having a polarizing film that transmits polarized light of a predetermined orientation emitted from the light color mixer and reflects light of other polarized light,
The light color mixer is a rectangular column made of a transparent material, and has a function of mixing light emitted from the multiple wavelength light sources by internal reflection and a function of converting the direction of polarization. A light-mixed lighting device.
The light color mixing lighting device according to claim 1,
The overall outer shape of the plurality of light emitting surfaces of the multiple wavelength light source has a different aspect ratio,
Light that is arranged such that the longitudinal direction of the incident surface of the light color mixer on which a plurality of light emitted from the multiple wavelength light source is incident is substantially orthogonal to the longitudinal direction of the light emitting surface of the multiple wavelength light source Mixed color lighting device.
The light color mixing lighting device according to claim 1,
A light color illuminating apparatus comprising particles formed of a transparent material having a refractive index different from that of the transparent material inside the light color mixer.
The light-mixed lighting device according to claim 1,
The light color mixer includes a transparent portion made of a transparent material, and a particle portion including particles formed of a transparent material having a refractive index different from the material of the transparent portion,
The light emitted from the multi-wavelength light source travels in the order from the transparent portion to the particle portion of the light color mixer.
The light color mixing lighting device according to claim 1,
The light color mixer includes an emission surface for emitting light,
A light color illuminating apparatus comprising: a housing outside the side surface other than the incident surface and the light exit surface of the light color mixer; and a reflective surface for reflecting light provided on the housing.
The light color mixing lighting device according to claim 5,
A light color illuminating apparatus comprising a reflector surface that bends light emitted from an emission surface of the light color mixer in a substantially orthogonal direction.
The light color mixing lighting device according to claim 6,
An emission surface of a housing that emits light bent by the reflector surface;
The light mixing lighting device characterized in that the size of the light emitting surface of the casing is made larger than the light emitting surface of the light color mixer.
The light color mixing lighting device according to claim 6,
The light-mixed lighting device, wherein the housing includes a tunnel-type side surface from the reflector surface to the exit surface of the housing, and the side surface has a function of reflecting light.
The light color mixing lighting device according to claim 8,
A light color illuminating apparatus comprising a diffusion film for diffusing light on an emission surface of the housing.