WO2009119476A1 - Conducteur de lumière, système optique d'éclairage et dispositif de projection d'image - Google Patents

Conducteur de lumière, système optique d'éclairage et dispositif de projection d'image Download PDF

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Publication number
WO2009119476A1
WO2009119476A1 PCT/JP2009/055588 JP2009055588W WO2009119476A1 WO 2009119476 A1 WO2009119476 A1 WO 2009119476A1 JP 2009055588 W JP2009055588 W JP 2009055588W WO 2009119476 A1 WO2009119476 A1 WO 2009119476A1
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WIPO (PCT)
Prior art keywords
light
incident
illumination optical
optical system
divided
Prior art date
Application number
PCT/JP2009/055588
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English (en)
Japanese (ja)
Inventor
池田優二
早川和弘
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ブラザー工業株式会社
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Publication of WO2009119476A1 publication Critical patent/WO2009119476A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0096—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the lights guides being of the hollow type
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/0994—Fibers, light pipes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light

Definitions

  • the present invention relates to a light pipe that introduces light from one end and emits the light from the other end, and an illumination optical system and an image projection apparatus using the light pipe.
  • Image projection apparatuses that irradiate light modulation elements such as liquid crystal display elements and DMD (digital micromirror device) elements with light from a light source and project an image on a screen have become widespread.
  • a halogen lamp, a high pressure mercury lamp, or the like has been used as a light source for irradiating the light modulation element.
  • these light sources require a large amount of electric power, and since a temperature rises and requires a cooling device, the weight and volume increase, which hinders the compact construction of the entire device.
  • the brightness and light emission efficiency of light emitting diodes (LEDs) have been improved. Since the LED has a low driving voltage and is small and lightweight, if the LED can be used as a light source of an image projection apparatus, the entire apparatus can be reduced in size and weight.
  • Patent Document 1 is intended to improve such a problem by using a rod integrator (hereinafter referred to as a light pipe).
  • FIG. 7 shows a cross-sectional structure of the illumination light source device 50 described in Patent Document 1.
  • the illumination light source device 50 includes a light pipe 51 and a white LED 52 provided in a light incident opening 54 of the light pipe 51.
  • the white LED 52 can set the light emitting point 53 inside the light guide path 56 from the end of the light pipe 51, and can efficiently guide the light emitted from the light emitting point 53 to the light exit opening 55.
  • the light pipe 51 has a hollow cylindrical shape, the number of times of internal reflection of light is increased as compared with the case where a solid columnar light pipe is used. Therefore, when light is emitted from the light emission opening 55, illumination light with a more uniform intensity can be obtained.
  • FIG. 8 shows a cross-sectional structure of the illumination device 60 described in Patent Document 2.
  • a rod 64 that gathers the exit side openings of the plurality of taper rods 63
  • LEDs 68R, 68G, 68B and LEDs installed at the bottom of each mortar-shaped taper rod 63
  • the LED array 62 is composed of the substrate 67.
  • the light emitted from each LED 68R, 68G, 68B is reflected by the wall surface of the taper rod 63, the emission angle becomes narrow, and is emitted from the exit end of the rod 64.
  • the light of each color emitted from the plurality of light sources of the LEDs 68R, 68G, and 68B is combined, and white light with higher directivity can be emitted.
  • the emission angle of light emitted from the light emitting point 53 of the white LED 52 is ⁇ .
  • the light emitted from the light emitting point 53 is repeatedly reflected by the inner surface 57 of the light pipe 51 and proceeds to the light exit opening 55.
  • the incident angle and the reflection angle are equal. That is, when the light emitted from the white LED 52 is emitted from the light emission opening 55, the emission angle is maintained. Therefore, if the emission angle of light emitted from the light emission opening 55 is ⁇ , the emission angle ⁇ is almost the same as the emission angle ⁇ . Therefore, in the illumination light source device 50 shown in FIG.
  • the directivity of the light emitted from the light pipe 51 is not so different from the directivity of the light emitted from the LED 52 as the light source. Therefore, additional devices are required to prevent the light utilization efficiency from being lowered.
  • the allowable incident angle of the projection lens is smaller than the light emission angle of the LED, light emitted from the light pipe at an emission angle larger than the allowable incident angle is not projected from the projection lens and is lost. .
  • the angle dependency of the emission light emitted from the rod 64 is maintained as it is and appears as uneven color in the projected image.
  • the emission colors are different between the LEDs 68R, 68G, 68B, there is a possibility that a color distribution is generated in the light emitted from the rod 64.
  • the quality of the projected image is deteriorated. Therefore, it is necessary to take measures such as further providing a light mixing means between the rod 64 and the light modulation element.
  • a side wall surface is formed of a cylindrical light guide having a reflecting surface, and light is introduced from an incident end and repeatedly reflected on the side wall surface to be emitted.
  • the light guide is configured with a light-transmitting partition that partitions at least the internal space on the incident end side of the light guide in the longitudinal direction of the light guide.
  • a diffractive part is formed on the surface of the entrance end side region of the partition, and an exit angle of light emitted from the exit end is smaller than an incident angle of light introduced from the entrance end; did.
  • the partition section has a cross shape so that two light-transmitting plates are orthogonal to each other, and the internal space is divided into four parts. You may make it the structure currently formed in the surface of a translucent board.
  • the diffractive portion may have a plurality of grooves, and the interval between the plurality of grooves may be narrowed toward the incident end.
  • the light incident on the incident end region of the light pipe enters the diffraction section near the incident end as the emission angle from the light emitting element increases.
  • the diffractive portion near the incident end is diffracted by receiving a stronger diffractive action because the groove interval is narrower than that of the diffractive portion on the exit end side. That is, as the light beam has a larger emission angle, it can be subjected to a large declination action that approximates to parallel light, and as a result, the directivity of the emitted light can be further increased.
  • the diffractive portion may have a plurality of grooves, and the intervals between the plurality of grooves may be different from each other in the two translucent plates orthogonal to each other.
  • An illumination optical system including the light pipe and a light emitting element installed at the incident end of the light pipe may be used.
  • Such a configuration makes it possible to irradiate light that is small and light, has high directivity, and has little luminance unevenness.
  • the incident end may be divided by the partition, and a plurality of the light emitting elements may be installed corresponding to the divided incident ends.
  • the shape of the light emitting surface of the light emitting element may be substantially the same as the shape surrounded by the side wall surface and the partition at the incident end.
  • the area of the light pipe exit surface can be minimized, and the utilization efficiency of light emitted from the light emitting element can be improved.
  • the incident end is divided into four by the partition, and light emitting elements of emission colors of red, green, blue, and white are installed at the four divided incident ends. It may be configured.
  • the incident end is divided into four by the partition, and light emitting elements of emission colors of red, green, green, and blue are installed at the four divided incident ends. It may be configured.
  • the image projection apparatus may include the illumination optical system, a light modulation unit that converts illumination light emitted from the illumination optical system into image light, and a projection unit that projects the image light.
  • a light-weight and small-sized image projection device can be configured.
  • the illumination optical system corresponds to each of the three primary colors, and a light combining unit that combines light emitted from each of the illumination optical systems, and the light combined by the light combining unit is modulated.
  • the light modulation unit may be configured to include the projection unit that projects the light modulated by the light modulation unit.
  • the present invention it is possible to emit light with higher directivity than incident light and improved luminance uniformity at the exit end, and as a result, improve light utilization efficiency. Can do.
  • FIG. 1 is a schematic longitudinal sectional view showing a configuration of a light pipe 1 according to an embodiment of the present invention.
  • the light pipe 1 is composed of a light guide 2 having a cylindrical shape.
  • a translucent partition 12 is formed in the inner space of the light guide 2.
  • the side wall surface 3 of the light guide 2 is constituted by a reflection surface that reflects light.
  • the light guide 2 receives light from the incident end 5 and emits the incident light from the exit end 6.
  • a diffractive portion 4 is formed on the upper surface of the partition portion 12 on the incident end 5 side. Light incident at an incident angle ⁇ is transmitted to the exit end 6 side in the diffraction section 4.
  • the diffractive portion 4 according to the transmission conditions of the diffractive portion 4, light of several orders among the light incident at the incident angle ⁇ 1 can be transmitted at the transmission angle ⁇ 2 having an angle larger than the incident angle ⁇ 1. .
  • the incident angle ⁇ 3 and the transmission angle ⁇ 4 are equal.
  • the incident angle and the reflection angle of the light incident on the side wall surface 3 of the light guide 2 are equal.
  • the emission angle ⁇ becomes smaller than the incident angle ⁇ .
  • the maximum angle of the light flux that enters with a spread is referred to as an incident angle ⁇
  • the maximum angle of the light flux that exits with a spread is referred to as an emission angle ⁇ .
  • an inorganic material such as glass, a resin material such as plastic, a metal material, ceramics, or the like is used.
  • a metal film such as Ag or Al or a reflective film of a dielectric film is provided.
  • the reflective film may be provided on the outer surface of the light guide 2, and part of the incident light incident on the light guide 2 is reflected by the inner surface, and the light transmitted through the inner surface is reflected by the reflective film on the outer surface. Reflected.
  • the partition portion 12 provided inside the light guide 2 can use an inorganic material such as translucent glass or a resin material such as translucent plastic.
  • the light guide 2 may have a cylindrical shape or a polygonal cylindrical shape.
  • the partition part 12 may be one sheet or a large number of sheets.
  • the cross section may be a cross shape so that the two translucent plates are orthogonal to each other, or the cross section may be a * shape.
  • the partition portion 12 may not be extended from the entrance end 5 to the exit end 6 but may be formed halfway.
  • the shape is set according to an apparatus that requires a uniform surface light source. For example, when irradiating light to a light modulation element whose display effective surface is a quadrangle, the cross section in the short direction of the light guide 2 is made a quadrangle. Thereby, the emitted light with high directivity and high uniformity of in-plane luminance distribution can be obtained.
  • the diffraction part 4 is formed in a region on the incident end 5 side of the partition part 12.
  • the diffractive portion 4 is formed on either one or both of the upper surface and the lower surface of the partition portion 12, and is constituted by a concave or V-shaped groove, or a convex or cross-shaped protrusion having a triangular or sawtooth shape.
  • the shape of the diffractive portion 4 is preferably determined so as to maximize the efficiency of one or more orders to be used.
  • These grooves and protrusions can be a diffraction grating or a hologram pattern.
  • a thin metal film or the like is provided on the surface of the partition portion 12 where the diffractive portion 4 is formed so as to be semi-transmissive so that a part of the light is transmitted and diffracted by the diffractive portion 4 and the remaining light is reflected and diffracted. May be.
  • FIG. 2A and FIG. 2B are explanatory diagrams showing the diffraction section 4 of the light pipe 1 according to the embodiment of the present invention.
  • FIG. 2A is a schematic partial cross-sectional view of a region on the incident end 5 side of the light pipe 1
  • FIG. 2B is a schematic perspective view of a region on the incident end 5 side of the light pipe 1.
  • the light pipe 1 is composed of a light guide 2 having a rectangular cylindrical shape. Inside the light guide 2, a partition portion 12 having a cross-shaped cross section is installed so that the two substrates of the lateral translucent plate 13 a and the longitudinal translucent plate 13 b are orthogonal to each other.
  • the side wall surface 3 of the light guide 2 is constituted by a reflecting surface.
  • a diffractive portion 4 is formed on the upper surface and the side surface (hereinafter collectively referred to as one surface) of the region on the incident end 5 side of the lateral light transmitting plate 13a and the vertical light transmitting plate 13b.
  • the diffractive portion 4 is composed of a large number of grooves 15.
  • the groove 15 is formed in a direction orthogonal to the longitudinal direction of the light guide 2.
  • the interval between the grooves 15 is smaller in the interval P1 on the incident end 5 side than on the interval P2 on the exit end 6 side. That is, the interval between the grooves 15 becomes narrower as the incident end 5 is approached.
  • a large incident angle ⁇ also referred to as a light emission angle from the light emitting element
  • the transmission angle transmitted through the lateral translucent plate 13a and the longitudinal translucent plate 13b increases. Then, it is converted into transmitted light that is nearly parallel to the longitudinal direction of the light guide 2. That is, the light is emitted from the emission end 6 at an emission angle ⁇ smaller than the incident angle ⁇ .
  • the light incident on the incident end 5 of the light guide 2 is incident on the diffraction section 4 near the incident end 5 as the incident angle ⁇ increases.
  • the diffractive portion 4 near the incident end 5 is diffracted by a stronger diffracting action because the diffraction groove 15 has a narrower interval than the diffractive portion 4 on the exit end 6 side, and is bent more greatly on the exit end 6 side. That is, as the light beam has a larger emission angle, it can be subjected to a larger declination effect that approaches the substantially parallel light.
  • LG W / (tan ( ⁇ / 2)) where LG is the length of the diffractive portion 4 in the longitudinal direction of the light guide 2 and W is the width of one incident end among the incident ends 5. In this case, light incident at an angle larger than the emission angle ⁇ is always incident on the diffraction section 4, and can be emitted from the emission end 6 at a small emission angle ⁇ .
  • the cross-sectional area in the direction orthogonal to the longitudinal direction of the light guide 2 need not be increased on the incident end 5 side and increased on the exit end 6 side, and the exit area of the exit end 6 can be reduced. It is possible to emit light with high directivity that is close to a point light source and has a uniform luminance distribution on the exit surface, and as a result, the light use efficiency can be improved.
  • the partition part 12 is formed so as to have a cross shape from the lateral translucent plate 13a and the longitudinal translucent plate 13b, and the diffraction part 4 is formed on the surfaces of the both translucent plates 13a and 13b, 4 Even when light of different colors is incident on the divided internal space, the light of each color can be transmitted to and mixed with other regions, and light with high directivity can be emitted.
  • the grooves 15 are formed at the same pitch in the horizontal translucent plate 13a and the vertical translucent plate 13b.
  • the present invention is not limited to this.
  • the pitch of the grooves 15 formed in the lateral translucent plate 13a and the pitch of the grooves 15 formed in the vertical translucent plate 13b can be different.
  • the groove 15 can be a hologram diffraction pattern instead of a parallel groove.
  • FIG. 3 is a schematic longitudinal sectional view showing the configuration of a light pipe 1 according to another embodiment of the present invention.
  • a partition 12 ′ is formed from the entrance end 5 toward the exit end 6 to the middle of the light guide 2.
  • Other configurations are the same as those of the light pipe 1 shown in FIG.
  • the same reference numerals are assigned to the same parts or parts having the same function.
  • the light pipe 1 is composed of a light guide 2 having a cylindrical shape.
  • a translucent partition portion 12 ′ is formed in the internal space of the light guide 2.
  • the partition portion 12 ′ is formed partway from the incident end 5 side of the light guide 2 toward the exit end 6. That is, the inner space on the incident end 5 side of the light guide 2 is formed so as to be partitioned in the longitudinal direction of the light guide 2.
  • the side wall surface 3 of the light guide 2 is constituted by a reflection surface that reflects light.
  • the light guide 2 receives light from the incident end 5 and emits the incident light from the exit end 6.
  • a diffractive portion 4 is formed on the upper surface of the partition portion 12 on the incident end 5 side. Light incident at an incident angle ⁇ is transmitted to the exit end 6 side in the diffraction section 4.
  • the diffractive part 4 In the diffractive part 4, according to the transmission conditions of the diffractive part 4, light of a specific order among the light incident at the incident angle ⁇ 1 is transmitted at a transmission angle ⁇ 2 having an angle larger than the incident angle ⁇ 1.
  • the incident angle ⁇ 3 and the reflection angle ⁇ 4 In the partition part 12 ′ other than the diffraction part 4 and the side wall surface 3 of the light guide 2, the incident angle ⁇ 3 and the reflection angle ⁇ 4 (when light passes through the region where the diffraction part 4 of the partition part 12 ′ is not formed). Is equal to the transmission angle ⁇ 4).
  • FIG. 4 is an explanatory diagram of the illumination optical system 10 according to the embodiment of the present invention.
  • 4A is a schematic longitudinal sectional view showing the illumination optical system 10
  • FIGS. 4B to 4D are plan views showing layouts of the light emitting elements 11.
  • FIG. The same portions or portions having the same function are denoted by the same reference numerals.
  • a light emitting element 11 is installed at an incident end 5 of a light pipe 1 made of a light guide 2.
  • the space surrounded by the side wall surface 3 of the light guide 2 has substantially the same cross-sectional shape in the direction orthogonal to the longitudinal direction of the light guide 2.
  • At least the internal space on the incident end 5 side of the light guide 2 is divided into two by a translucent partitioning portion 12.
  • the light pipe 1 is the same as that described in FIG. 1 or FIG.
  • the partition portion 12 may be formed partway along the light guide 2, and an interval may be provided between the end portion of the partition portion 12 and the exit end 6.
  • the light emitting element 11 is composed of a base 8 and LEDs 7a and 7b installed on the base 8.
  • the light exit surface 9 a of the LED 7 a has substantially the same shape as the shape of the lower incident end 5 a divided by the partition portion 12, and the light exit surface 9 b of the LED 7 b is the upper portion divided by the partition portion 12.
  • the incident end 5b has substantially the same shape.
  • the exit surfaces 9a and 9b of the LEDs 7a and 7b are installed in close contact with the upper and lower incident ends 5a and 5b, respectively. Therefore, the light emitted from each of the emission surfaces 9a and 9b is introduced into the light guide 2 without leaking outside.
  • the light introduced into the light guide 2 is transmitted to the exit end 6 side by the diffractive portion 4 and is converted into exit light having high directivity and a uniform luminance distribution at the exit end 6.
  • the exit light since light having a wide directivity from the exit surfaces 9a and 9b can also be used as the exit light, the light use efficiency can be improved.
  • FIG. 4A is a case where the internal space of the light guide 2 is divided into two by the partitioning section 12, but instead of this, it is divided into four or even more divided as shown in FIG. It may be a thing. Further, the LED 7a and the LED 7b may have the same or different emission colors. Moreover, the partition part 12 installed inside the light guide 2 is divided into four when the cross section as shown in FIG. 2 has a cross shape and the inner space of the light guide 2 is divided into four. Four LEDs emitting the same color may be installed at the incident end, or LEDs emitting different colors may be installed. With this configuration, light with high directivity and high luminance can be obtained by arranging light emitting elements of the same color, and light with high directivity and low luminance unevenness can be obtained by installing light emitting elements of different colors. Can be irradiated.
  • FIG. 4B is a plan view of the light emitting element 11 viewed from the light guide 2 side when the internal space of the light guide 2 is divided into two by a partition portion 12 made of a single translucent plate.
  • the light emitting element 11 includes an LED 7 a and an LED 7 b installed on the base 8.
  • the light emission surfaces of the LEDs 7 a and 7 b have substantially the same shape as the divided incident ends 5 a and 5 b of the light guide 2. If the LEDs 7a and 7b have a complementary color relationship such as blue and yellow, white light can be emitted from the emission end 6.
  • FIGS. 4C and 4D are viewed from the light guide 2 side when the internal space on the incident end 5 side of the light guide 2 is divided into four by a partition portion 12 made of a translucent plate having a cross-shaped cross section.
  • 3 is a plan view of the light emitting element 11.
  • the light emitting element 11 is provided with a red light emitting LED 7R, a green light emitting LED 7G, and a blue light emitting LED 7B installed on the base 8.
  • the light emission surfaces of the LEDs 7R, 7G, and 7B have substantially the same shape as the four divided incident ends of the light guide 2. All the colors can be emitted by the light emission of the three primary colors of the LEDs 7R, 7G, and 7B. Further, by using the two green LEDs 7G, it is possible to emit light that matches the visibility characteristic.
  • a red light emitting LED 7R, a green light emitting LED 7G, a blue light emitting LED 7B, and a white light emitting LED 7W can be installed on the base 8. While white light is obtained by additive color mixture of red, green, and blue, and a white light emitting LED 7W is provided, all colors can be emitted, and bright white light can be obtained.
  • FIG. 5 is a schematic cross-sectional view showing the image projector 20 according to the embodiment of the present invention.
  • the image projection device 20 includes a light combining unit 22, three light modulation units 21 R, 21 G, and 21 B provided on three sides of the light combination unit 22, and three light modulation units 21 R, 21 G, and 21 B.
  • the light combining unit 22 is configured by a dichroic prism.
  • the light modulator 21R is a liquid crystal display element that displays a red image
  • the light modulator 21G is a liquid crystal display element that displays a green image
  • the light modulator 21B is a liquid crystal display element that displays a blue image.
  • Each of the three illumination optical systems 10R, 10G, and 10B has a red light emitting element 11R composed of LEDs 7a and 7b emitting red light and a green light emitting element composed of LEDs emitting green light at the incident end 5 of the light pipe 1 composed of the light guide 2.
  • An element 11G and a blue light emitting element 11B including a blue light emitting LED are provided.
  • the projection unit 23 includes a projection lens system for projecting an image.
  • each illumination optical system 10R, 10G, 10B has a surface shape similar to the shape of the display effective area of each light modulator 21R, 21G, 21B.
  • the display effective area of each of the light modulation units 21R, 21G, and 21B has a quadrangle, and the ratio of the length and width of the quadrangle is, for example, 3 to 4
  • each of the illumination optical systems 10R, 10G, and 10B also has a quadrangle.
  • the aspect ratio of the rectangular injection end 6 is also set to 3 to 4.
  • a partition portion 12 having a cross-shaped cross section is installed inside the light guide 2, and a diffraction portion 4 including a plurality of grooves is formed on the surface of the incident end 5 of the partition portion 12.
  • the pitch of many grooves becomes narrower as it approaches the incident end 5 side.
  • a large number of grooves formed on the surface of the translucent plate 13a constituting the cross shape of each illumination optical system 10R, 10G, and 10B, and a large number of grooves formed on the surface of the vertical translucent plate 13b Are different in the interval between adjacent grooves.
  • the groove intervals are formed in accordance with the emission colors of the light emitting elements 11R, 11G, and 11B.
  • each of the illumination optical systems 10R, 10G, and 10B is substantially parallel or matched with the numerical aperture of the projection lens via the relay lenses 24R, 24G, and 24B, and the light modulators 21R and 21G. , 21B.
  • Each of the light modulation units 21R, 21G, and 21B converts incident illumination light into image light corresponding to each color.
  • Image light emitted from each of the light modulation units 21R, 21G, and 21B is additively mixed by the light combining unit 22 and projected onto a screen or the like via the projection unit 23.
  • the relay lenses 24R, 24G, and 24B are provided between the illumination optical systems 10R, 10G, and 10B and the light modulators 21R, 21G, and 21B.
  • the relay lenses 24R, 24G, and 24B can be removed, and the light modulation units 21R, 21G, and 21B corresponding to the illumination optical systems 10R, 10G, and 10B can be disposed close to each other.
  • the shape of the exit end 6 of each of the illumination optical systems 10R, 10G, and 10B and the shape of the effective display area of each of the light modulators 21R, 21G, and 21B can be made substantially the same surface shape.
  • FIG. 6 is a schematic cross-sectional view showing an image projection apparatus 20 according to another embodiment of the present invention.
  • the image projection apparatus 20 includes an illumination optical system 10, a relay lens 24, a reflective light modulation unit 21, and a projection unit 23 that projects image light reflected from the light modulation unit 21.
  • the illumination optical system 10 includes a light guide 2, a partition 12 provided in the light guide 2, and a light emitting element 11 provided at the incident end 5 of the light guide 2.
  • the light emitting element 11 includes a base body 8, a red light emitting LED 7R provided on the base body 8, a green light emitting LED 7G (not shown), and a blue light emitting LED 7B.
  • the LEDs 7R, 7G, and 7B are integrated and installed on the base 8, and the entire light emitting surface of the LEDs 7R, 7G, and 7B has substantially the same shape as the incident surface of the incident end 5, and the end of the light guide 2 It is installed in close contact with. Therefore, the light of each LED 7R, 7G, 7B does not leak outside.
  • the light of the colors of the LEDs 7R, 7G, and 7B is repeatedly reflected on the diffraction portion 4 and the side wall surface 3 of the partitioning portion 12, and is converted into emitted light having a uniform luminance distribution and high directivity on the exit surface of the exit end 6.
  • the light modulator 21 is composed of a DMD element.
  • the DMD element is configured such that a large number of micromirrors can rotate according to an image signal.
  • the light emitted from the illumination optical system 10 is irradiated onto the DMD element via the relay lens 24, reflected according to the display image by a large number of micromirrors of the DMD element, and via the projection unit 23 configured by the lens system. Projected onto a screen or the like.
  • the DMD element operates as follows.
  • a light source driving circuit that drives the light emitting element 11 drives each of the LEDs 7R, 7G, and 7B in a time-sharing manner to sequentially emit red, green, and blue light.
  • a display driving circuit that drives the DMD element sequentially displays a red image, a green image, and a blue image on the DMD element in synchronization with the time-division driving.
  • red, green, and blue images are sequentially projected from the projection unit 23, and the observer views these colors as time-averaged images.
  • As a light color mixing method as shown in FIG.
  • the illumination optical system 10 of different colors for example, each of the illumination optical systems 10 of red, green, and blue, is combined and mixed by the light combining unit 22,
  • the combined light may be applied to the reflective light modulation unit 21 via the relay lens 24, and image light may be projected by the projection unit 23 that projects the light modulated by the light modulation unit 21.
  • the relay lens 24 is provided in the gap between the illumination optical system 10 and the light modulation unit 21, but the relay lens 24 can be omitted.
  • a reflective liquid crystal display element can be used instead of the DMD element.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Microscoopes, Condenser (AREA)

Abstract

Dans un conducteur de lumière (1), une lumière émise à partir d'une source de lumière est mise en entrée à partir d'une extrémité d'entrée (5), réfléchie de façon répétée par une surface de paroi latérale (3) et émise à partir d'une extrémité de sortie (6). Le conducteur de lumière émet une lumière d'éclairage ayant une directivité de lumière élevée et une distribution de luminance uniforme avec un rendement d'utilisation de lumière amélioré. Dans un corps de guide de lumière (2), une section de séparation de transmission de lumière (12) est configurée pour séparer un espace interne du corps de guide de lumière (2) dans la direction longitudinale du corps de guide de lumière (2), une section de diffraction (4) est formée sur une surface dans une région de la section de séparation (12), sur le côté de l'extrémité d'entrée (5), et l'angle de sortie (β) de lumière émise à partir de l'extrémité de sortie (6) est défini inférieur à l'angle d'entrée (α) de la lumière introduite à partir de l'extrémité d'entrée (5).
PCT/JP2009/055588 2008-03-28 2009-03-23 Conducteur de lumière, système optique d'éclairage et dispositif de projection d'image WO2009119476A1 (fr)

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JP2008-088193 2008-03-28
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JP2009-029974 2009-02-12
JP2009029974A JP2009258656A (ja) 2008-03-28 2009-02-12 ライトパイプ、照明光学系及び画像投影装置

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WO2013035016A1 (fr) * 2011-09-06 2013-03-14 Koninklijke Philips Electronics N.V. Panneau électroluminescent doté d'un panneau de support alvéolaire transparent
JP2015055772A (ja) * 2013-09-12 2015-03-23 ウシオ電機株式会社 複合導光体および光源装置
CN106444245A (zh) * 2016-08-26 2017-02-22 湖北久之洋红外系统股份有限公司 一种无散斑三基色激光光源

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JP2015090423A (ja) 2013-11-06 2015-05-11 セイコーエプソン株式会社 光分岐装置および磁気測定装置
JP6413291B2 (ja) 2014-03-27 2018-10-31 セイコーエプソン株式会社 虚像表示装置、およびヘッドマウントディスプレイ
JP2019174503A (ja) * 2018-03-27 2019-10-10 京セラ株式会社 集光機能を有する表示装置およびその製造方法、発電装置、並びに電子機器

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JP2004020724A (ja) * 2002-06-13 2004-01-22 Seiko Epson Corp 導光装置、照明装置、光学装置、投射型表示装置
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WO2013035016A1 (fr) * 2011-09-06 2013-03-14 Koninklijke Philips Electronics N.V. Panneau électroluminescent doté d'un panneau de support alvéolaire transparent
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JP2015055772A (ja) * 2013-09-12 2015-03-23 ウシオ電機株式会社 複合導光体および光源装置
CN106444245A (zh) * 2016-08-26 2017-02-22 湖北久之洋红外系统股份有限公司 一种无散斑三基色激光光源

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