JP3508190B2 - Lighting device and projection display device - Google Patents

Lighting device and projection display device

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Publication number
JP3508190B2
JP3508190B2 JP32271693A JP32271693A JP3508190B2 JP 3508190 B2 JP3508190 B2 JP 3508190B2 JP 32271693 A JP32271693 A JP 32271693A JP 32271693 A JP32271693 A JP 32271693A JP 3508190 B2 JP3508190 B2 JP 3508190B2
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Japan
Prior art keywords
lens
reflector
lighting device
uniform illumination
light beam
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JP32271693A
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Japanese (ja)
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JPH07174974A (en
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唯哲 中山
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セイコーエプソン株式会社
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Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination device for uniformly illuminating a rectangular shape, and a projection display device for enlarging and displaying an image of a liquid crystal panel or the like on a screen. 2. Description of the Related Art As a method of uniformly illuminating a target area, there is a method of using a uniform illumination optical element composed of two lens plates, which is generally called an integrator illumination system. FIG. 1A shows an example of the structure. Light emitted from the light source lamp 101 is reflected by the reflector 102,
The light beam emitted almost in parallel passes through two lens plates 103 and 104 in which a plurality of spherical lenses are arranged in a matrix, passes through an auxiliary lens 105, and passes through the illumination target 1
06 is illuminated uniformly. Here, the first lens plate 10
Reference numeral 3 denotes a plurality of rectangular lenses, each of which forms an image of the light source at the center of the corresponding rectangular lens in the second lens plate 104. Then, the first lens plate 103
The image of each rectangular lens is superimposed and formed on the illumination target 106 by the operation of the second lens plate 104 and the auxiliary lens 105. Therefore, the illumination target 106 is the first lens plate 10
It is illuminated with a rectangular shape similar to the rectangular lens 3. In addition,
Here, the first lens plate 103 and the second lens plate 104
Are the same, and the focal length of each rectangular lens is equal to the distance between them. The focal length of the auxiliary lens 105 is equal to the distance between the auxiliary lens 105 and the illumination target 106. [0003] The integrator illumination system has been conventionally used as an illumination system for an exposure machine or a projection display device, and recently used as an illumination system for a liquid crystal projector for projecting and displaying an image on a liquid crystal panel. A specific method for the liquid crystal projector is described in detail in Japanese Patent Application Laid-Open No. 3-111806. A reflector used in a conventional integrator illumination system has a spherical shape, a paraboloid of revolution, a spheroid or a hyperboloid of revolution, and a reflected light beam is transmitted directly or after passing through a spherical lens to the first light source. Was incident on the lens plate. However, in the above-described method, the angular distribution of the light beam incident on the first lens plate differs for each lens, and the angle variation generally increases toward the center of the incident light beam. Because of the large size, there is a problem that a light amount loss occurs at the center of the second lens plate. That is, FIG.
As shown in (B), the light source image formed on the second lens plate 104 becomes larger as it is formed near the center of the lens plate. As a result, the light amount was lost. Further, a light source image 10 formed on the periphery of the second lens plate
8 was so small that a considerable gap was formed between adjacent light source images, and the apparent light source on the second lens plate, that is, the entire secondary light source, was unnecessarily large. Therefore, the present invention is to solve such a problem, and an object of the present invention is to provide an illumination system using an integrator, which has a very small light quantity loss and a small secondary light source. To provide.
Another object of the present invention is to provide a projection display device which is small in size and has high light use efficiency by applying this illumination device to an illumination optical system of a liquid crystal projector. A lighting device according to the present invention comprises a light source lamp, a reflector for reflecting a light beam emitted from the light source lamp in one direction, and a plurality of spherical lenses arranged in a plane. In a lighting device including a uniform illumination optical element formed by a single lens plate and an auxiliary lens that superimposes each light beam split by the uniform illumination element, a non-uniform illumination optical element is disposed between the reflector and the uniform illumination optical element. A spherical lens is arranged, and the reflector is formed such that the angle ranges of the respective light beams incident on the respective portions on the aspherical lens are substantially equal. Is deflected so as to be substantially parallel to an optical axis passing through the center of the light source lamp and the reflector. Further, the uniform illumination optical element comprises a first lens plate having a plurality of rectangular lenses arranged in a plane without any gap, and a rectangular lens having the same number as the number of rectangular lenses included in the first lens plate. And a second lens plate arranged in a plane. The uniform illumination optical element includes a first lens plate having a plurality of rectangular lenses arranged in a plane without any gap, and a hexagonal lens having the same number as that of the rectangular lenses included in the first lens plate. And a second lens plate disposed two-dimensionally without any gap. The uniform illumination optical element includes a first lens plate having a plurality of rectangular lenses arranged in a plane without any gap, and a diamond-shaped lens having the same number as the number of rectangular lenses included in the first lens plate. And a second lens plate arranged in a plane. A uniform illumination optical element including a light source lamp, a reflector for reflecting a light beam emitted from the light source lamp in one direction, four lens plates having a plurality of cylindrical lenses arranged in a plane, and the uniform illumination element. In an illumination device configured to include an auxiliary lens that superimposes each of the divided light beams, an aspheric lens is arranged between the reflector and the uniform illumination optical element, and the reflector is provided on the aspheric lens. The aspherical lens is formed so that the angle ranges of the respective light beams incident on the respective portions are substantially equal, and the aspherical lens changes the angle of the principal ray of each light beam having the substantially equal angle range, thereby forming the light source lamp and the reflector. It is formed so as to be substantially parallel to the optical axis passing through the center. Further, 4 which constitutes the uniform illumination optical element.
It is characterized in that two of the two lens plates are integrated to form two lens plates. Further, each of the lens plates included in the uniform illumination optical element is constituted by a refractive index distribution type cylindrical lens. According to a second aspect of the present invention, there is provided a projection display apparatus, comprising: the illumination device described above; a modulating means for modulating a light beam from the illumination device to include image information; and projecting the modulated light beam on a screen. A projection optical system including a projection optical system for displaying, wherein a lens is arranged in the vicinity of the modulating means, and an image of a light emitting surface of the illumination device is formed on an entrance pupil of the projection optical system. It is characterized by making it. Hereinafter, an illumination device and a projection display device according to the present invention will be described in detail with reference to the drawings. FIG. 2 shows a basic configuration of the lighting device of the present invention. The light source lamp 101 is a light source close to a point, such as a halogen lamp, a metal halide lamp, or a xenon lamp. The emitted light flux is reflected in one direction by a reflector 102. The shape of the reflector 102 cannot be expressed by a simple mathematical expression like a parabola or an ellipse because the inclination of each part in the cross section is determined continuously by calculation. Can be expressed. The reflected light beam then enters the aspheric lens 201, and the principal ray of the light beam incident on each part of the aspheric lens 201 is deflected in a direction parallel to the optical axis 203. The configuration after the aspherical lens 201 is almost the same as that of a normal integrator illumination system, but will be briefly described below. First lens plate 103
Is formed by closely arranging a plurality of rectangular lenses, and the shape of each rectangular lens is similar to the rectangular shape of the illumination target 106. The light beam incident on the first lens plate 103 is divided for each rectangular lens, and each rectangular lens condenses each incident light beam on one point on the second lens plate 104, and as a result, the second lens plate A plurality of light source images are formed on 104. The second lens plate 104 has a structure in which a plurality of lenses are densely arranged, and the center of each lens coincides with the center of a light source image formed on the second lens plate 104. Each lens included in the second lens plate 104 has a power to form an image of the rectangular lens included in the corresponding first lens plate 103 at infinity. The auxiliary lens 105 has a focal length equal to the distance to the illumination target 106, and forms a rectangular image that can be formed at infinity so as to exactly overlap the illumination target 106 arranged at a finite distance. Therefore, each light beam divided into a plurality of rectangular shapes by the first lens plate 103 is
Since the image is superimposed on the image, the original non-uniform light beam is efficiently converted into a rectangular uniform light beam. The field lens 202 is for adjusting the angle of the principal ray of the light beam incident on the illumination target 106. If the focal length is equal to the distance to the auxiliary lens 105, the main lens of the light beam incident on the illumination target 106 is provided. Is substantially parallel to the optical axis 203. FIG. 3A shows the most important shapes of the reflector 102 and the aspherical lens 201 in the present invention.
This will be described in detail using FIG. The angle range of the light beam used in the integrator illumination system described above is determined by the configuration of the illumination system, and the utilization rate within a certain angle is 100%. Therefore, the angle is defined as θ degrees, and the aspherical lens 201
The reflector 102 and the aspherical lens 201 are designed so that all the light beams passing through the optical axis 203 have an angle within θ degrees with respect to the optical axis 203. First, the reflector 102 is designed so that the light beam incident on each point on the aspherical lens 201 falls within ± θ degrees around the principal ray. Since the central part of the aspherical lens 201 is a plane perpendicular to the optical axis 203, the light beam incident on the central part is in a range of ± θ degrees with respect to the optical axis 203. Accordingly, first, a straight line drawn at an angle of θ degrees from the center of the aspherical lens and a curve inside a point c1 which is an intersection with the reflector 102 are a point b which is one end of the light source 301 and a center point of the aspherical lens 201. And an elliptic curve having the two points as focal points. Next, a light beam starting from a point a which is one end of the light source 301 on the reflector 102 side is c
A point reflected at one point and hitting the aspherical lens 201 is referred to as a point d. From this point d, the light source 301 can be seen as a reflection image outward from the point c1 of the reflector 102. Therefore, the curve of the reflector 102 may be determined so that this reflection image can be seen within a range of 2θ degrees from the point d. In other words, a straight line having an angle of 2θ degrees with the line segment c1d is drawn from the point d, and the inclination of the reflector 102 at the intersection c2 of the straight line and the curve continuously extended from the point c1 indicates that the ray starting from the point b is c
What is necessary is just to design so that it is reflected at two points and goes to point d.
Actually, the curve from c1 to c2 is designed by a part of the circle, and c
A circle having a curvature that is smooth at one point and has the above-mentioned inclination at the point c2 may be determined by trial and error. The shape outside the point c2 is determined by repeating the same method as described above, and as a result, a reflector having a shape obtained by combining a part of a plurality of circles is obtained. Finally, the shape of the reflector 102 is approximated by a continuous higher-order function, and the effect may be confirmed by simulation. The reflector 10 thus determined
On the aspherical lens 201, the reflected light fluxes from 2 have the same angle range of the light fluxes incident on each point, which is 2θ degrees. However, since the direction of the principal ray of each light beam is not constant, the optical axis 203 is changed by the curved surface of the aspherical lens 201.
Bend so that it is parallel to. The curved surface shape of the aspherical lens 201 generally has a shape in which the central portion has positive power and the peripheral portion has negative power, as shown in FIG. Further, the aspheric lens 201 may have a shape in which the principal ray of the light flux of each part is deflected in such a direction as to intersect at one point on the optical axis 203. Since the light beam passing through the system having such a configuration of the reflector and the aspherical lens has a uniform angular distribution, a light source image formed on the second lens plate of the integrator illumination system is shown in FIG. As shown in B), the size of the light source image 302 at the center and the size of the light source image 303 at the periphery are
They are almost the same, and have an optimal size that fits exactly in the inscribed circle of the rectangular lens. Therefore, there is no loss of light quantity at the center part as in the related art, and the size of the light source at the peripheral part is larger than that of the related art, so that the use efficiency of the light beam is dramatically increased. The second lens plate 104 in FIG.
As shown in FIG. 4A and FIG. 4B, it may be constituted by a hexagonal or rhombic lens. In these cases, it is necessary to arrange each rectangular lens of the first lens plate in accordance with the arrangement of the second lens plate 104, and each rectangular lens is shifted halfway left and right with respect to the position of the upper and lower rectangular lenses. It is arranged in the configuration. When each lens of the second lens plate 104 has a hexagonal shape as shown in FIG. 4A, the size of the inscribed circle increases as the shape becomes closer to a circle than a rectangle, and the light source image formed on each lens increases. There is a merit that can be. When the aspect ratio of the rectangular lens of the first lens plate is 1: 3.5, the shape of each lens of the second lens plate 104 is a regular hexagon, which is most suitable. Also, when a rhombus-shaped lens as shown in FIG. 4B is used, the size of the inscribed circle becomes larger than in the case of a rectangular shape, and the efficiency increases. When the aspect ratio of the rectangular lens of the first lens plate is 1: 2, the rhombus of the second lens plate 104 is optimally square. FIG. 5A shows an example of the structure of a lighting device according to the present invention. The basic configuration is the same as that of FIG. 2, but here, the integrator composed of the first lens plate 103 and the second lens plate 104 in FIG. Lens plate. Four lens plates 501, 502, 503, 50
No. 4 can be divided into two sets in which the directions of the cylindrical lenses are the same, and the directions of the cylindrical lenses in each set are in a relationship orthogonal to each other. In this example, the lens plates 501, 503 and the lens plates 502, 50
4 in two sets. Therefore, the luminous flux passing through the four lens plates is orthogonal to the plane perpendicular to the optical axis.
The two components are independently collected. This configuration has the advantage that the size of each lens can be made smaller than when a normal spherical lens is used, and therefore the length of the integrator in the optical axis direction can be reduced. Also,
There is an advantage that the aspect ratio of a rectangularly illuminated portion can be easily changed by replacing one of the lens plate sets with another lens plate set. FIG.
(B) shows a configuration in which four lens plates are integrated two by two. The lens plate 505 and the lens plate 506 each function as an integrator for orthogonal light flux components. Also, the lens plate 505 or the lens plate 506
If the directions of the cylindrical lenses formed on both sides of the lens plate are made orthogonal to each other, the lens plate 50
5 and the lens plate 506 can be formed in the same shape. The lens plate having the same function as the lens plate in FIG. 5B can be constituted by a refractive index distribution type lens. FIG. 6A is a diagram illustrating a method for manufacturing by an ion exchange method as an example. On the glass substrate 601 containing low refractive index ions, a mask 6 made of metal coating
02 is immersed in a solution salt containing ions that provide a high refractive index. A region 6 having a refractive index distribution in the glass substrate 601 by performing ion exchange from the opening of the mask 602
03 is formed. If the opening of the mask 602 is formed in a rectangular shape, a rectangular lens having the same function as a spherical lens is formed. Further, if the openings of the mask 602 are formed in a stripe shape, a lens plate having the same function as a cylindrical lens is formed. FIG. 6B shows an example in which an integrator illumination system is constructed using a gradient index lens plate formed by an ion exchange method. The light beam emitted from the light source lamp 101 is reflected by the optimally designed reflector 102 and enters the aspheric lens 604 as in the case of FIG. This aspheric lens 604 can be formed of a Fresnel lens. An integrator composed of two lens plates 605 and 606 having stripe-shaped gradient index lenses formed on both sides has the same configuration of the two lens plates, and both are laminated. The auxiliary lens 607 on the emission side is constituted by a Fresnel lens here. If the integrator is made of a lens plate formed by the ion exchange method in this way, not only can the integrator be made thin, but also the surface of the lens plate becomes flat, so that each optical element can be bonded. Therefore, alignment is easy,
Light loss due to surface reflection can be minimized. Next, a projection type display device according to the present invention will be described in detail with reference to the drawings. FIG. 7A illustrates a configuration example of a projection display device of the present invention. The light beam emitted from the light source device composed of the light source lamp 101 and the reflector 102 passes through the uniform illumination optical element 701 composed of the aspheric lens 201 and the integrator of the two lens plates 103 and 104 described above. Then, the light enters a color separation optical system 702 composed of a blue-green reflecting dichroic mirror, a blue reflecting dichroic mirror, and a reflecting mirror. White light (W) of the light source passes through the color separation optical system 702 and is separated into three primary colors of RGB. The optical path distances between the uniform illumination optical element 701 and the position where each color light exits the color separation optical system 702 are all equal. Next, the respective color lights enter the parallelizing lenses 703a, 703b, and 703c, respectively, and the divergent light beams from the uniform illumination optical element 701 are parallelized.
Red light (R) and blue light (B) of the collimated light flux
Are incident on liquid crystal panels 705a and 705b placed immediately after the parallelizing lenses 703a and 703b, respectively, and are modulated, and video information corresponding to each color light is added. On the other hand, the green light (G) passes through the light transmitting means 704 including three lenses and two reflecting mirrors, and then enters the liquid crystal panel 705c and is modulated. Liquid crystal panels 705a, 705b, 7
Each color light modulated at 05c then enters a cross dichroic mirror 706, which is a color combining means. Since the cross dichroic mirror 706 includes a green reflective dielectric multilayer and a red reflective dielectric multilayer in an X-shape,
Blue light (B) is transmitted, and red light (R) and green light (G) are reflected. Therefore, all the color lights are combined into one, and the combined optical image is projected onto the screen 7 by the projection lens 707.
08 is projected and displayed. As the projection lens 707,
Those close to telecentric are used. FIG. 7B is a diagram showing another example of the configuration of the projection display device of the present invention. The light beam emitted from the light source lamp 101 is reflected by the reflector 102, enters the aspheric lens 201, and further enters the integrator composed of the first lens plate 103 and the two second lens plates 104. . Inside the integrator, a blue-green reflecting dichroic mirror 709 is arranged at an angle of 45 degrees and separates incident white light into red light (R) that transmits, blue light (B) and green light (G) that reflect. I do. The transmitted red light (R) is sequentially reflected by the reflecting mirrors 713, 714, and 715, passes through the parallelizing lens 703c, and passes through the liquid crystal panel 705.
modulated by c. On the other hand, the reflected green light (G) is reflected by a reflecting mirror 710, then reflected by a green reflecting dichroic mirror 711, further reflected by a reflecting mirror 713 and incident on a parallelizing lens 703b, and is reflected by a liquid crystal panel 705b. Modulated. The blue light (B) is reflected by the reflecting mirror 710, passes through the green reflecting dichroic mirror 711, is further reflected by the reflecting mirror 712, and is reflected by the parallelizing lens 70.
3a and is modulated by the liquid crystal panel 705a. The modulated light beams enter the cross dichroic mirror 706 and are combined on the same optical axis. The combined luminous flux passes through the projection lens 707 and forms an image on the screen 708. FIG. 8 is a diagram showing another configuration example of the projection display device of the present invention. As in the case described above, the illumination system is an integrator illumination system including the optimally designed reflector 102 and the aspheric lens 201. White light (W) emitted from this illumination system is reflected by a red-green reflecting dichroic mirror 80.
1, the light is divided into a reflected yellow light (G, R) and a transmitted blue light (B). After being reflected by the reflecting mirror 802, the blue light is incident on the collimating lens 703a, becomes a substantially parallel light flux, and is modulated by the liquid crystal panel 705a. On the other hand, the yellow light is a red reflecting dichroic mirror 80.
At 8, the light is separated into reflected red light and transmitted green light, and the respective color lights are incident on the collimating lenses 703 b and 703 c and further modulated by the liquid crystal panels 705 b and 705 c. The modulated blue light and red light are combined by a red-reflecting dichroic mirror 804 and are incident on a projection lens 807. The modulated green light is reflected by the reflecting mirror 803 and enters the projection lens 807. Projection lens 807
There are two light beam incident portions, and lenses 805a and 805b are arranged at each of the light incident portions. The light beams that have passed through the two incident portions are combined into one by the dichroic mirror 806, and further pass through the lens group of the emission portion. As the dichroic mirror 806, one that transmits green light is used, and there are two types of configurations, one using a plate-like mirror and the other using a prism-like mirror. The light beam that has passed through the projection lens 807 forms an image on a screen 708. As described above, according to the present invention, in a lighting device using an integrator, a curved surface shape of a reflector for reflecting radiation light from a light source is optimally designed, and further, a light beam incidence of the integrator is performed. By arranging the aspherical lens on the side, the light flux passing through the integrator and entering the illuminated portion can be increased as compared with the related art.
In addition, since each light source image formed on the emission section of the integrator can be made uniform and optimal in size, the apparent light source size seen from the illuminated section can be reduced. Further, the projection type display device of the present invention using this illumination system can realize bright and high-quality image quality because the efficiency of the illumination system is high. Also, since the apparent light source size is smaller than before, the aperture of the projection lens can be made smaller, and the design becomes easier.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a diagram showing a configuration of a conventional lighting device.
(B) is a diagram showing an apparent light source shape in a conventional lighting device. FIG. 2 is a diagram showing a basic configuration of a lighting device of the present invention. FIG. 3A is a diagram showing a design method of a reflector and an aspheric lens used in the illumination device of the present invention. (B) is a diagram showing an apparent light source shape in the lighting device of the present invention. FIG. 4A is a diagram illustrating a configuration example of a lens plate used in the lighting device of the present invention. FIG. 3B is a diagram illustrating another configuration example of the lens plate used in the lighting device of the present invention. FIG. 5A illustrates a configuration example of a lighting device of the present invention. FIG. 2B is a diagram illustrating a configuration example of an integrator used in the lighting device of the present invention. FIG. 6A is a diagram illustrating a method for manufacturing a lens plate used in the lighting device of the present invention. FIG. 2B is a diagram illustrating a configuration example of a lighting device of the present invention. FIG. 7A is a diagram illustrating another configuration example of the projection display device of the present invention. FIG. 3B is a diagram illustrating another configuration example of the projection display device of the present invention. FIG. 8 is a diagram showing another configuration example of the projection display device of the present invention. DESCRIPTION OF SYMBOLS 101 Light source lamp 102 Reflector 103, 104 Lens plate 106 Illumination object 201 Aspherical lens 202 Field lens 601 Glass substrate 602 Mask 603 Refractive index distribution area 705 Liquid crystal panel 706 Cross dichroic mirror 707 Projection lens 708 Screen

Claims (1)

  1. (57) [Claim 1] A light source lamp, a reflector for reflecting a luminous flux from the light source lamp in one direction, and two lens plates in which a plurality of spherical lenses are arranged in a plane. In a lighting device including a uniform illumination optical element and an auxiliary lens that superimposes each light beam divided by the uniform illumination element, an aspheric lens is disposed between the reflector and the uniform illumination optical element. The reflector is formed so that the angle range of each light beam incident on each part on the aspheric lens is substantially equal, and the aspheric lens changes the principal ray of each light beam having substantially the same angle range. A lighting device characterized in that it is formed so as to be substantially parallel to an optical axis passing through the center of the light source lamp and the reflector. 2. The uniform illumination optical element comprises: a first lens plate in which a plurality of rectangular lenses are arranged in a plane without a gap; and a rectangular lens of the same number as the rectangular lenses included in the first lens plate without a gap. The lighting device according to claim 1, comprising a second lens plate arranged in a plane. 3. The uniform illumination optical element includes: a first lens plate in which a plurality of rectangular lenses are arranged in a plane without any gap; and a hexagonal lens having the same number as that of the rectangular lenses included in the first lens plate. 2. The lighting device according to claim 1, wherein the lighting device is constituted by a second lens plate arranged in a plane without any gap. 4. The uniform illumination optical element includes a first lens plate in which a plurality of rectangular lenses are arranged in a plane without a gap, and a rhombic lens having the same number as that of the rectangular lenses included in the first lens plate. 2. The lighting device according to claim 1, wherein the lighting device is constituted by a second lens plate arranged in a plane. 5. A uniform illumination optical element including a light source lamp, a reflector that reflects a light beam emitted from the light source lamp in one direction, four lens plates in which a plurality of cylindrical lenses are arranged in a plane, and the uniform illumination element. In an illumination device including an auxiliary lens that superimposes each divided light beam, an aspheric lens is disposed between the reflector and the uniform illumination optical element, and the reflector is provided on the aspheric lens. The aspherical lens is formed such that the angle ranges of the respective light beams incident on the respective portions are substantially equal, and the aspherical lens changes the angle of the principal ray of the respective light beams having the substantially equal angle ranges, so that the light source lamp and the reflector have different angles. A lighting device, which is formed so as to be substantially parallel to an optical axis passing through the center. 6. The illumination device according to claim 5, wherein two of the four lens plates constituting the uniform illumination optical element are integrated into two lens plates. 7. The illuminating device according to claim 5, wherein each lens plate included in said uniform illumination optical element is constituted by a refractive index distribution type cylindrical lens. 8. The lighting device according to claim 1, a modulating means for modulating a light beam from the lighting device to include image information, and projecting and displaying the modulated light beam on a screen. In a projection display apparatus including a projection optical system, a lens is disposed near the modulation unit,
    A projection display device, wherein an image of a light beam exit surface of the illumination device is formed on an entrance pupil of the projection optical system.
JP32271693A 1993-12-21 1993-12-21 Lighting device and projection display device Expired - Fee Related JP3508190B2 (en)

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