JPH10115870A - Illumination optical system device and projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an illumination optical system device whose utilization efficiency of light emitted from a light source is high. SOLUTION: This device is constituted of the light source 20 radiating light, a parabolic reflector 40 reflecting the light emitted from the light source 20 toward the side of a surface to be irradiated 140, a first lens array board 61 arranged on an optical path between the reflector 40 and the surface 140, having plural lenses, and having at least one lens with eccentricity facing outward, a second lens array board 81 arranged on an optical path between the board 61 and the surface 140, having plural lenses corresponding to the respective lenses of the board 61, and a field lens 121 for transmitting the light. Thus, the proportion of the light made incident on the respective corresponding lenses of the array 81 among the light passing through the respective lenses of the array 61 is increased, so that the light utilization efficiency is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination optical system for efficiently irradiating light emitted from a light source without uneven brightness and color, and to a projection display device provided with the illumination optical system. .

[0002]

2. Description of the Related Art FIG.
FIG. 6 is a diagram illustrating a configuration of a conventional illumination system described in Japanese Patent Application Laid-Open No. 6-206. In the figure, 20 is a light source, 40 is a parabolic reflector, 6
0 is the first lens array plate, 80 is the second lens array plate,
100 is an imaging lens, 120 is a field lens, 14
Reference numeral 0 denotes a surface to be irradiated, 180 denotes a projection lens system, and a line indicated by an arrow denotes a light ray.

Next, the operation will be described. Light emitted from the light source 20 is reflected by the parabolic reflector 40,
The light is incident on the first lens array plate 60 as substantially parallel light. Each lens constituting the first lens array plate 60 forms a light source image near each corresponding lens of the second lens array plate 80, and the second lens array plate 80 and the imaging lens 100 form the second light source image. An image in the vicinity of each lens of the one lens array plate 60 is superimposed and formed in the vicinity of the irradiated surface 140,
The field lens 120 suppresses the divergence of light from the imaging lens 100, and transmits the light that has passed through the surface to be irradiated 140 to the projection lens system 180.

[0004]

In the conventional illumination optical system, each lens of the first lens array plate has no inward eccentricity or no eccentricity. Therefore, the size of each lens of the second lens array plate is small. If the light source has a certain size, the light from each lens of the first lens array plate cannot be sufficiently taken in by the corresponding lens of the second lens array plate. Therefore, there is a disadvantage that sufficient brightness cannot be obtained on the irradiated surface.

Further, in a projection type display device using a conventional illumination optical system device, a small amount of illumination light to a light valve by the conventional illumination optical system device directly leads to a decrease in brightness of a reproduced image. As a projection display device,
This is a factor that hinders functional improvement.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a first object of the present invention is to provide an illumination optical system having a high use efficiency of light from a light source. A second object is to obtain a small illumination optical system device. Further, a third object is to obtain a bright projection display device for a reproduced image. A fourth object is to obtain a small projection display device.

[0007]

In the illumination optical system according to the present invention, a light source for emitting light, a reflecting mirror for reflecting light from the light source to an irradiated surface side, the reflecting mirror and the light receiving member are provided. A first lens array plate having a plurality of lenses disposed in an optical path between irradiation surfaces; and a first lens array plate disposed in an optical path between the first lens array plate and the irradiated surface. A second lens array plate having a plurality of lenses corresponding to each lens, and an illumination optical system device in which at least one lens is disposed in an optical path between the second lens array plate and the surface to be irradiated. At least one of the lenses of one lens array plate has outward eccentricity.

A light source for emitting light, a reflecting mirror for reflecting light from the light source to the surface to be irradiated, and a plurality of lenses disposed in an optical path between the reflecting mirror and the surface to be irradiated are provided. A first lens array plate, and a second lens array plate having a plurality of lenses disposed in an optical path between the first lens array plate and the surface to be illuminated and corresponding to each lens of the first lens array plate And an illumination optical system in which at least one lens is disposed in an optical path between the second lens array plate and the irradiated surface, wherein a concave lens is disposed in an optical path between the reflecting mirror and the first lens array plate. It was done.

Further, in a projection type display device for modulating an image signal using a light valve such as a transmission type liquid crystal and projecting the image signal on a screen via a projection lens, the illumination optical system of the light valve is defined as claim 1 or 2. An illumination optical system according to claim 2 is used.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be specifically described with reference to the drawings showing the embodiments. Embodiment 1 FIG. FIG. 1 is a schematic diagram showing a configuration of an illumination optical system device according to Embodiment 1 of the present invention. Note that FIG.
The same reference numerals are given to the same parts as those described above, and the individual description is omitted. In FIG. 1, reference numeral 61 denotes a first lens array plate having a plurality of lenses; 81, a second lens array plate having a plurality of lenses corresponding to each lens of the first lens array plate 61; 121, a field lens;
Is a light beam emitted from the parabolic reflector 40, a is the distance between the first lens array plate 61 and the second lens array plate 81, and b is the distance between the second lens array plate 81 and the irradiated surface 140. Reference numeral 201 denotes a light beam radiated from the focal point of the parabolic reflector 40 and passes through the center of each lens of the first lens array plate 61 via the parabolic reflector 40 (hereinafter, radiated from the focal point of the parabolic reflector 40). A ray passing through the center of each lens of the first lens array plate via the parabolic reflector is referred to as a principal ray).

Next, the first lens array plate 61 will be described. FIG. 2 is a schematic diagram of a first lens array plate of the illumination optical system device according to the first embodiment of the present invention. The same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted. In the figure, reference numeral 75 denotes a first lens array plate. The first lens array plate has a light beam 200 emitted from the parabolic reflector 40 as shown in FIG.
And almost all of a / a
It has a plurality of lenses of similar shape at magnification b, at least one of which has an outward eccentricity. The first
The lens array plate 61 may have a shape like the first lens array plate 75 shown in FIG.

In FIG. 1, a parabolic reflector is used as a reflector for reflecting the light emitted from the light source 20 to the irradiated surface 140 side. A mirror may be used.

Next, the operation and effect will be described. FIG. 3 is a diagram for explaining the effect of the illumination optical system according to the first embodiment of the present invention. FIG. 3 (1) is a conventional example and is the same as FIG. 16, and FIG. 3 (2) is the present invention. It is the same as FIG. The same parts as those in FIGS. 1 and 16 are denoted by the same reference numerals, and their description is omitted. In the figure, 41 is a parabolic reflector, 62 is a first lens array plate, 82 and 83 are second lens array plates, 123 is a field lens, 203 is a light beam emitted from the parabolic reflector 41, 202, 204 is a principal ray, c is the distance between the first lens array plate 60 and the second lens array plate 82, d is the distance between the second lens array plate 82 and the irradiated surface 140, and e is the first lens array plate 62 and the second lens array plate. Distance of lens array plate 83 and f
Is the distance between the second lens array plate 83 and the irradiated surface 140.

First, the conventional case shown in FIG. 3A will be described. Light emitted from the light source 20 is reflected by the parabolic reflector 40 and is incident on the first lens array plate 60. Since the first lens array plate 60 has no eccentricity, the direction of the principal ray 202 is
Does not change when passing through. The light that has passed through the first lens array plate 60 converges from each lens of the first lens array plate 60 toward each corresponding lens of the second lens array plate 82, and is located near each lens of the second lens array plate 82. A light source image is formed. Each lens of the second lens array plate 82 superimposes and forms an image near each lens of the corresponding first lens array plate 60 near the irradiated surface 140, and
0 suppresses the divergence of light from the second lens array plate 82,
The light from the second lens array plate 82 is transmitted to the irradiated surface 140. It should be noted that the second lens array plate 82 combines the functions of the second lens array plate 80 and the imaging lens 100 in FIG.

At this time, if the light source 20 is a point light source having no size, the light from the light source becomes perfect parallel light by the parabolic reflector 40, and the light passing through the first lens array plate 60 is , A point near the center of each corresponding lens of the second lens array plate 82, but actually, the light source 2
Since 0 has a finite size, even if the parabolic reflector 40 is used, the light incident on the first lens array plate 60 is not necessarily a parallel light beam, It has a finite angular dispersion determined by the focal length of the object reflecting mirror 40, and the light source image formed near each lens of the second lens array plate 82 has a finite size. Therefore, FIG.
In (1), the ratio of light that can be effectively used by the second lens array plate 82, that is, of the light that has passed through each lens of the first lens array plate 60, can be incident on the corresponding lens of the second lens array plate 82. The ratio of light is limited by the relationship between the distance c between the first lens array plate 60 and the second lens array plate 82 and the size of each lens of the second lens array plate 82, and light may not be used effectively.

In the case of the present invention, as shown in FIG. 3B, the light source 20, the parabolic reflector 40, the outer shape of the first lens array plate 61 having outward decentered lenses, Each lens constituting the lens array plate 61 and the irradiated surface 1
The dimension 40 and the distance a between the first lens array plate 61 and the second lens array plate 81 and the distance b between the second lens array plate 81 and the irradiated surface 140 are determined by the light source 20 and the parabolic reflection shown in FIG. Mirror 40, outer shape of first lens array plate 60, dimensions of each lens and irradiated surface 140, distance c between first lens array plate 60 and second lens array plate 82, and second lens array plate 82 and irradiated surface 140 If the distance d is the same as
By giving the lens of the lens array plate 61 outward decentering, the principal ray 201 is bent outward by the lens of the first lens array plate 61, and accordingly, the lens of the second lens array plate 81 is moved in FIG. Since the size of the lens of the second lens array plate 82 of (1) can be made larger, the ratio of light that can be effectively used by the second lens array plate 81 increases, and light can be efficiently radiated to the irradiation surface 140.

In the case of the present invention, FIG.
As shown in (3), the first lens array plate 62 having the lens decentered outward has the same number of lenses as the lens array plate 60 of FIG. 3A, and the light source 20 and the second lens array. The outer shape of the plate 83, the size of each lens and the irradiated surface 140, and the distance f between the second lens array plate 83 and the irradiated surface 140 are determined by the outer shape of the light source 20 and the second lens array plate 82 in FIG. Assuming that the dimensions of the lens and the irradiated surface 140 and the distance d between the second lens array plate 82 and the irradiated surface 140 are the same,
When the lens of the first lens array plate 62 is decentered outward, the principal ray 204 is bent outward, so that the parabolic reflector 41 and the first lens array plate 62
Can be made smaller than the parabolic reflector 40 and the first lens array plate 60 of FIG. At this time, the distance e between the first lens array plate 62 and the second lens array plate 83 is (dimension of each lens of the first lens array plate 62) / (the irradiated surface 140
The dimension of each lens of the first lens array plate 62 is smaller than the dimension of each lens of the first array plate 60 in FIG. 1
Distance e between lens array plate 62 and second lens array plate 83
Is shorter than the distance c between the first lens array plate 60 and the second lens array plate 82 in FIG. Here, since the parabolic reflector 41 is smaller than the parabolic reflector 40 in FIG. 1A, the angular dispersion of the emitted light increases. The ratio of the light that can be used effectively is reduced, and the size of each lens of the second lens array plate 83 is the same as the size of each lens of the second lens array plate 82 in FIG. When the distance e between the first lens array plate 62 and the second lens array plate 83 is shorter than the distance c between the first lens array plate 60 and the second lens array plate 82 in FIG. Since the increase in the ratio of available light can be made substantially equal, the size of the illumination optical system device can be reduced without reducing the light use efficiency.

FIG. 4 is a schematic diagram showing another configuration of the illumination optical system device according to the first embodiment of the present invention. FIG.
The same reference numerals are given to the same parts as those described above, and the individual description is omitted. In the figure, 63 is a first lens array plate, 84 is a second lens array plate, 101 is an imaging lens, 124 is a field lens, and 205 is a principal ray. The first lens array plate 63 takes in almost all of the light beam 200 emitted from the parabolic reflector 40, has a plurality of lenses having a shape substantially similar to the surface to be irradiated 140, and at least one lens is directed outward. Have eccentricity. The second lens array plate 84 has a plurality of lenses corresponding to each lens of the first lens array plate 63.

The light emitted from the light source 20 is converted by the parabolic reflector 40 into substantially parallel light by the first lens array plate 63.
Is incident on. Each lens of the first lens array plate 63 forms a light source image near each lens of the corresponding second lens array plate 84, and the second lens array plate 84 transmits the passing light to the imaging lens 101, The image near each lens of the lens array plate 63 is illuminated by the corresponding lens of the second lens array plate 84 and the imaging lens 101 onto the illuminated surface 140.
The image is superimposed and formed in the vicinity, and the field lens 124 suppresses the divergence of the light from the imaging lens 101 and transmits the light to the irradiation surface 140. Here, since at least one of the lenses of the first lens array plate 63 has an outward eccentricity, the principal ray 205 is bent outward, and accordingly, the principal ray 205 of the second lens array plate 84 The lens can be enlarged,
By increasing the proportion of the light that has passed through the first lens array plate 63 and can be incident on each lens of the corresponding second lens array plate 84, the irradiation surface 140 can be efficiently illuminated.

As shown in FIG. 1, the second lens array plate 8
In contrast to the configuration in which the image in the vicinity of each lens of the first lens array plate 61 corresponding to each lens of the second lens array plate 81 is superimposed and formed near the surface to be illuminated, 1 The first lens array plate 6 corresponding to each lens of the second lens array plate 84 by the image lens 101
3 is formed so as to form an image near each lens in the vicinity of the irradiated surface 140 so that the second lens array plate 8
The degree of freedom increases in the arrangement position of the imaging lens 4 and the imaging lens 101, and the optical path can be designed in accordance with the arrangement positions of mirrors, filters, and the like included in the optical path.

In FIG. 4, a parabolic reflector is used as a reflector for reflecting light emitted from the light source 20 to the irradiated surface 140 side. A mirror may be used. Further, in FIG. 4, the number of imaging lenses is one, but a plurality of imaging lenses may be used.

Embodiment 2 FIG. FIG. 5 is a schematic diagram showing a configuration of an illumination optical device according to Embodiment 2 of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the figure, 6
4 is a first lens array plate, 85 is a second lens array plate,
125 is a field lens, 160 is a concave lens, 206
Is a principal ray, 207 is a light beam from the concave lens 160, g is a distance between the first lens array plate 64 and the second lens array plate 85, and h is a distance between the second lens array plate 85 and the irradiated surface 140. The first lens array plate 64 takes in almost all of the light flux 207 from the concave lens 160, and
And a plurality of lenses having a similar shape at a magnification of approximately g / h. The second lens array plate 85 has a plurality of lenses corresponding to each lens of the first lens array plate 64.

In FIG. 5, a parabolic reflector is used as a reflector for reflecting the light emitted from the light source 20 to the surface to be irradiated 140, but the reflection of a spheroidal reflector, a spherical reflector, or the like. A mirror may be used.

Next, the operation and effect will be described. FIG. 6 is a diagram for explaining the effect of the illumination optical system device according to the second embodiment of the present invention. FIG. 6 (1) is a conventional example and is the same as FIG. 16, and FIG. 6 (2) is the present invention. It is the same as FIG. The same parts as those in Embodiment 1 and FIG. 5 are denoted by the same reference numerals, and the description thereof is omitted.
In the figure, reference numeral 65 denotes a first lens array plate, 86 denotes a second lens array plate, 126 denotes a field lens, 161 denotes a concave lens, 209 denotes a principal ray, 210 denotes a light beam from the concave lens 161, and i denotes the first lens array plate 65. The distance between the second lens array plate 86 and j is the distance between the second lens array plate 86 and the surface 140 to be irradiated.

First, the conventional case shown in FIG. 6A is the same as that shown in FIG.

In the case of the present invention, as shown in FIG. 6 (2), the outer shape of the light source 20, the parabolic reflector 40, the first lens array plate 64, the dimensions of each lens and the illuminated surface 140, and the first The distance g between the lens array plate 64 and the second lens array plate 85 and the distance h between the second lens array plate 85 and the illuminated surface 140 are determined by the light source 20, the parabolic reflector 40 in FIG.
External shape of first lens array plate 60, each lens and irradiated surface 1
Assuming that the dimensions of the parabolic reflector 40 are the same as the distance c between the first lens array plate 60 and the second lens array plate 82 and the distance d between the second lens array plate 82 and the irradiated surface 140,
In the optical path between the first lens array plate 64 and the concave lens 16
By arranging 0, the light beam 207 spreads more than the light beam 200, so that the ratio of light that can be captured by the first lens array plate 64 is slightly smaller than the ratio of light that can be captured by the first lens plate 60 in FIG. However, the chief ray 206
Is bent outward by the concave lens 160, whereby the lens of the second lens array plate 85 can be made larger than the lens of the second lens array plate 82 in FIG. Thus, the effect of increasing the ratio of light that can be effectively used can be greater, and thus the light can be radiated to the irradiation surface 140 efficiently.

In the case of the present invention, FIG.
As shown in (3), the first lens array plate 65 is
It has the same number of lenses as the lens array plate 60 of (1), the light source 20, the outer shape of the second lens array plate 86, the dimensions of each lens and the irradiated surface 140, and the dimensions of the second lens array plate 86 and the irradiated surface 140. Assuming that the distance j is the same as the outer shape of the light source 20, the second lens array plate 82, the dimensions of each lens and the irradiated surface 140, and the distance d between the second lens array plate 82 and the irradiated surface 140 in FIG. Since the chief ray 209 is bent outward by the concave lens 161 arranged in the optical path between the parabolic reflector 42 and the first lens array plate 65, the parabolic reflector 42 and the first lens array plate 65 In FIG. 6 (1)
Can be made smaller than the parabolic reflector 40 and the first lens array plate 60. At this time, the first lens array plate 65 and the second
The distance i of the lens array plate 86 is (first lens array plate 6
5) / (dimension of irradiated surface 140) ≒ i
/ J, since the size of each lens of the first array plate 65 is smaller than the size of each lens of the first lens array plate 60 in FIG. The distance i between the lens and the second lens array plate 86 is as shown in FIG.
The distance c between the first lens array plate 60 and the second lens array plate 82 in (1) is shorter. Here, the parabolic reflector 4
6 is smaller than the parabolic reflector 40 of FIG. 6A, the angular dispersion of the emitted light is increased, and the ratio of the light that can be effectively used by the second lens array plate 86 is reduced. The reduction and the size of each lens of the second lens array plate 86 are the same as the size of each lens of the second lens array plate 82 in FIG. 6A, and the first lens array plate 65 and the second lens array plate 86 Is shorter than the distance c between the first lens array plate 60 and the second lens array plate 82 in FIG. 6A, the ratio of light that can be effectively used by the second lens array plate 86 increases. , The illumination optical system can be downsized without reducing the light use efficiency.

FIG. 7 is a schematic diagram showing another configuration of the illumination optical system device according to the second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the figure, 66 is a first lens array plate, 87 is a second lens array plate, 127
Denotes a field lens, 162 denotes a concave lens, 102 denotes an imaging lens, 211 denotes a principal ray, and 212 denotes a light beam from the concave lens 162. The first lens array plate 66 is a concave lens 1
Almost all of the light flux 212 from 62 is taken in, and a plurality of lenses having a shape substantially similar to the irradiated surface 140 are provided. The second lens array plate 87 has a plurality of lenses corresponding to each lens of the first lens array plate 66.

The light radiated from the light source 20 is incident on the concave lens 162 as substantially parallel light by the parabolic reflector 40, and the principal ray is bent outward by the concave lens 162, so that the first light is bent.
The light is incident on the lens array plate 66. Each lens of the first lens array plate 66 forms a light source image near each corresponding lens of the second lens array plate 87, and the second lens array plate 8
Reference numeral 7 transmits the passing light to the imaging lens 102, and an image near each lens of the first lens array plate 66 is formed near each of the irradiation surface 140 by each lens of the second lens array plate 87 and the imaging lens 102. Image is superimposed on the field lens 1
27 suppresses the divergence of the light from the imaging lens 102 and transmits the light from the imaging lens 102 to the irradiated surface 140. Here, since the principal ray is bent outward by the concave lens 162, the lens of the second lens array plate 87 can be enlarged,
By increasing the proportion of the light that has passed through the first lens array plate 66 and can be incident on each lens of the corresponding second lens array plate 87, the irradiation surface 140 can be efficiently illuminated.

As shown in FIG. 5, an image in the vicinity of each lens of the first lens array plate 64 corresponding to each lens of the second lens array plate 85 is formed by the second lens array plate 85 in the vicinity of the irradiated surface 140. In contrast to the configuration in which
The second lens array plate 87 and the imaging lens 102
By forming an image near each lens of the first lens array plate 66 corresponding to each lens of the lens array plate 87 so as to be superimposed and formed near the irradiated surface 140, the second lens array plate 87 and the imaging lens are formed. The degree of freedom increases in the arrangement position of the optical path 102, and it becomes possible to design an optical path in accordance with the arrangement position of mirrors, filters, and the like included in the optical path.

In FIG. 7, a parabolic reflecting mirror is used as a reflecting mirror for reflecting light emitted from the light source 20 to the irradiated surface 140 side. A mirror may be used. In FIG. 7, the number of imaging lenses is one, but the number of imaging lenses may be plural.

FIG. 8 is a schematic diagram showing still another configuration of the illumination optical system device according to the second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In the figure,
50 is a spheroidal reflecting mirror, 67 is a first lens array plate,
88 is a second lens array plate, 103 is an imaging lens, 12
8 is a field lens, 163 is a concave lens, 213 is a light beam emitted from the spheroidal reflecting mirror 50, 214 is radiated from the focal point of the spheroidal mirror 50, and passes through the spheroidal mirror 50 of the first lens array plate 67. A ray passing through the center of each lens, 215 is a light flux from the concave lens 163, k is a distance between the first lens array plate 67 and the second lens array plate 88 and l
Is the distance between the imaging lens 103 and the irradiated surface 140. The first lens array plate 67 takes in almost all of the light flux 215, and the focal length is approximately the distance k between the first lens array plate 67 and the second lens array plate 88, and is similar to the irradiated surface 140 at a magnification of approximately k / l. It has a plurality of lenses that do not have eccentricity in a simple manner. The second lens array plate 88 has the same specifications as the first lens array plate 67.

The light emitted from the light source 20 is incident on the concave lens 163 as a convergent light by the spheroidal reflecting mirror 50, and the concave lens 163 makes the light ray 214 incident on each lens of the first lens array plate 67 almost in parallel. Bend outwards. Since the focal length of each lens of the first lens array plate 67 is the distance k between the first lens array plate 67 and the second lens array plate 88, the light passing through each lens of the first lens array plate 67 corresponds to the first lens array plate 67. An image of a light source is formed near each lens of the two-lens plate 88, and the second lens array plate 88 has a focal length of each lens equal to the distance k between the first lens array plate 67 and the second lens array plate 88. The divergent light from the center of each lens of the first lens array plate 67 is transmitted to the imaging lens 103 as parallel light. First lens array plate 67
Are superimposed and imaged in the vicinity of the irradiated surface 140 by the corresponding lenses of the second lens array plate 88 and the imaging lens 103, and the field lens 128 is formed of the light from the imaging lens 103. Suppress divergence, irradiated surface 1
By transmitting the light to the surface 40, the irradiation surface 140 is efficiently irradiated. Therefore, the first lens array plate 67 and the second lens array plate 88 can be a lens array plate having the same specifications, and an illumination optical system with good light use efficiency can be obtained at low cost.

Embodiment 3 FIG. 9 is a schematic diagram showing a configuration of a projection display apparatus according to Embodiment 3 of the present invention.
The same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted. In the figure, reference numeral 141 denotes a light valve such as a transmission type liquid crystal which modulates light according to a video signal.
Corresponds to the surface to be irradiated. 68 is a first lens array plate, 89 is a second lens array plate, 129 is a field lens, 181 is a projection lens system, 216 is a principal ray, 217
Is a region that can be captured by the projection lens system 181, m is the distance between the first lens array plate 68 and the second lens array plate 89, and n is
Is the distance between the second lens array plate 89 and the light valve 141. The first lens array plate 68 takes in almost all of the light beam 200 emitted from the parabolic reflector 40, has a plurality of lenses similar in shape to the light valve 141 at a magnification of approximately m / n, and has at least one lens. Has outward eccentricity. The second lens array plate 89 has a plurality of lenses corresponding to each lens of the first lens array plate 68.

In FIG. 9, a parabolic reflector is used as a reflector for reflecting light emitted from the light source 20 to the light valve 141. However, a reflector such as a spheroidal reflector and a spherical reflector is used. May be used.

Next, the operation and effects of the conventional example and the case of the present invention will be described with reference to the drawings.

FIG. 15 is a schematic view showing a configuration example of a conventional projection display device. The same parts as those in FIGS. 3, 9, and 16 are denoted by the same reference numerals, and the description thereof will not be repeated.

In FIG. 15A, the light emitted from the light source 20 is reflected by the parabolic reflector 40 and is incident on the first lens array plate 60 as substantially parallel light. Since the first lens array plate 60 has no eccentricity, the direction of the principal ray 202 does not change even when passing through the first lens array plate. The light that has passed through the first lens array plate 60
The light is focused from each lens of the lens array plate 60 toward the corresponding lens of the second lens array plate 82 to form a light source image near each lens of the second lens array plate 82. Second
Each lens of the lens array plate 82 superimposes and forms an image near each lens of the corresponding first lens array plate 60 near the light valve 141, and the field lens 120 suppresses divergence of light from the second lens array plate 82. , Light valve 1
The light passing through 41 is transmitted to the projection lens system 181.

At this time, since the size of the second lens array plate 82 is limited by the direction of the principal ray 202 and the first lens array plate 60, the size can be captured by the projection lens system 181 as shown in FIG. It may be smaller than the area 217, and the performance of the projection lens system 181 may not be sufficiently exhibited.

FIG. 10 is a diagram for explaining the effects of the projection display apparatus according to the third embodiment of the present invention. In addition,
The same parts as those in FIG. 9 are denoted by the same reference numerals, and the description thereof is omitted. In the figure, 93, 94, 9
Reference numeral 5 denotes a second lens array plate.

In FIG. 10A, the light emitted from the light source 20 is reflected by the parabolic reflector 40 and is incident on the first lens array plate 68 as substantially parallel rays. Bent outward by the array plate 68,
The light that has passed through the first lens array plate 68 converges from each lens of the first lens array plate 68 toward each corresponding lens of the second lens array plate 89, and is located near each lens of the second lens array plate 89. A light source image is formed. Each lens of the second lens array plate 89 corresponds to the corresponding first lens array plate 6.
8 is superimposed and formed in the vicinity of the light valve 141, the field lens 129 suppresses the divergence of light from the second lens array plate 89, and transmits the light passing through the light valve 141 to the projection lens system 181. Has communicated.

Here, the light source 20, the parabolic reflector 40, the outer shape and the size of each lens of the first lens array plate 68, the light valve 141, the projection lens system 181 and the first lens array plate 68 and the second lens array The distance m between the plate 89 and the distance n between the second lens array plate 89 and the light valve 141 are shown in FIG.
5, light source 20, parabolic reflector 40, outer dimensions of first lens array plate 60 and dimensions of each lens, light valve 141, projection lens system 181, and distance between first lens array plate 60 and second lens array plate 82 c and the second lens array plate 82
When the distance d is equal to the distance d between the first lens array plate 68 and the light valve 141, the principal ray 216 is bent outward by the lens of the first lens array plate 68 because the lens of the first lens array plate 68 has an outward eccentricity. Accordingly, as shown in FIG. 10 (2), the lens of the second lens array plate 89 is slightly larger than the area 217 in which the projection lens system 181 can be taken in, and as shown in FIG. 10 (3). The size can be made equal to the area 217 that can be captured by the projection lens system 181 or the size of the lens of the second lens array plate can be changed as shown in FIG. It becomes possible to make the shape suitable for the region 217, and of the light that has passed through each lens of the first lens array plate 68, it enters the corresponding lens of the second lens array plate 89. By optimizing the relationship between the ratio of the light that can be generated and the ratio of the light that can be captured by the projection lens system 181 of the light that has passed through the second lens array plate 89, the light from the light source is efficiently used and the reproduced image is bright. A projection display device can be obtained.

FIG. 11 is a schematic diagram showing another configuration of the illumination optical system device according to the third embodiment of the present invention. In the figure, 301 is a light source, 302 is a spheroidal reflecting mirror, 303
Are filters that absorb or reflect ultraviolet and infrared light;
04 is a first lens array plate, 305 is a second lens array plate, 306, 307, 308 and 309 are mirrors, 31
Numerals 0, 311 and 312 are imaging lenses, 313 and 314 are dichroic mirrors that reflect or transmit light in a predetermined range of wavelengths, 315, 316 and 317 are field lenses, 318, 319 and 320 are light valves, 32
Reference numeral 1 denotes a dichroic prism that synthesizes light that has passed through each of the light valves 318, 319, and 320. Reference numeral 322 denotes a projection lens system. The first lens array plate 304 captures almost all the light flux from the spheroidal reflecting mirror 302, has a plurality of lenses having shapes substantially similar to the light valves 318, 319, and 320, and at least one lens has an outward eccentricity. have. Further, the second lens array plate 305 is
It has a plurality of lenses corresponding to each lens of the lens array plate 304.

The light emitted from the light source 301 becomes a focused light beam by the spheroidal reflecting mirror 302, and the ultraviolet rays and the infrared rays are removed by the filter 303, and the first lens array plate 30 is removed.
4 is incident. Each lens of the first lens array plate 304 forms a light source image near each lens of the corresponding second lens array plate 305, and an image near each lens of the first lens array plate 304 forms a corresponding second lens array. The respective lenses of the plate 305 and the imaging lenses 310, 311 and 312 form superimposed images near the respective light valves 318, 319 and 320, and the field lenses 315, 316 and 317 emit light from the imaging lenses 310 and 312. And transmits the light passing through the light valves 318, 319, and 320 to the projection lens system 322. Here, since the first lens array plate 304 is provided with outward eccentricity, the second lens array plate 305 can have an appropriate size and shape based on the concept described with reference to FIG. , A bright projection display device can be obtained.

Embodiment 4 FIG. 12 is a schematic diagram showing a configuration of a projection display apparatus according to Embodiment 4 of the present invention. The same parts as those in FIG. 9 are denoted by the same reference numerals, and the description thereof will not be repeated. In the figure, 69
Is a first lens array plate, 90 is a second lens array plate, 1
30 is a field lens, 164 is a concave lens, 218 is a principal ray, 219 is a light beam from the concave lens, o is the distance between the first lens array plate and the second lens array plate, and p is the distance between the second lens array plate and the light valve 141. It is. The first lens array plate 69 takes in almost all the light flux 219 emitted from the concave lens 164, and has a plurality of lenses similar in shape to the light valve 141 at a magnification of approximately o / p. The second lens array plate 90 has a plurality of lenses corresponding to each lens of the first lens array plate 69.

In FIG. 12, a parabolic reflector is used as a reflector for reflecting the light emitted from the light source 20 to the light valve 141, but a reflector such as a spheroidal reflector and a spherical reflector is used. May be used.

Next, the operation and effect of the conventional example and the case of the present invention will be described with reference to the drawings.

FIG. 15 is a schematic diagram showing the configuration of a conventional projection display device. It should be noted that the conventional case shown in FIG.

FIG. 13 shows the case of the present invention. FIG. 13 is a diagram for explaining an effect of the projection display apparatus according to the fourth embodiment of the present invention. The same parts as those in FIG. 12 are denoted by the same reference numerals, and the description thereof will not be repeated. In the figure, reference numerals 96, 97 and 98 are second lens array plates.

In FIG. 13A, the light emitted from the light source 20 is reflected by the parabolic reflecting mirror 40 and is incident on the concave lens 164 as substantially parallel rays, and the principal ray 218 is bent outward by the concave lens 164. The light that has passed through the first lens array plate 69 converges from each lens of the first lens array plate 69 toward each corresponding lens of the second lens array plate 90, and is located near each lens of the second lens array plate 90. A light source image is formed. Each lens of the second lens array plate 90 superimposes and forms an image near each lens of the corresponding first lens array plate 69 near the light valve 141, and the field lens 130 diverges light from the second lens array plate 90. , And the light passing through the light valve 141 is transmitted to the projection lens system 181.

Here, the light source 20, the parabolic reflector 40, the outer shape and the size of each lens of the first lens array plate 69, the light valve 141, the projection lens system 181 and the first lens array plate 69 and the second lens array The distance o between the plate 90 and the distance p between the second lens array plate 90 and the light valve 141 are shown in FIG.
5, light source 20, parabolic reflector 40, outer dimensions of first lens array plate 60 and dimensions of each lens, light valve 141, projection lens system 181, and distance between first lens array plate 60 and second lens array plate 82 c and the second lens array plate 82
If the distance d is equal to the distance d between the light valve 141 and the light valve 141, since the concave lens 164 is arranged in the optical path between the parabolic reflector 40 and the first lens array plate 69, the chief ray 218 is directed outward by the concave lens 164. The lens of the second lens array plate 90 is bent as shown in FIG.
The area 217 that can be captured by the projection lens system 181 has a slightly larger size, or the area 217 that can be captured by the projection lens system 181 has the same size as shown in FIG. As shown in (4), the size of each lens of the second lens array plate can be changed to a shape suitable for the area 217 that can be captured by the projection lens system 181, and each lens of the first lens array plate 69 can be formed. The relationship between the ratio of the light that can enter the corresponding lens of the second lens array plate 90 and the ratio of the light that can be captured by the projection lens system 181 among the light that has passed through the second lens array plate 90 in the light that has passed through By optimizing, a projection display device with a bright reproduced image can be obtained by efficiently using the light of the light source.

FIG. 14 is a schematic diagram showing another configuration of the illumination optical system device according to the fourth embodiment of the present invention. The same parts as those in FIG. 12 are denoted by the same reference numerals, and the description thereof will not be repeated. In the figure, 323 is a concave lens, and 324 is a first lens array plate. The first lens array plate 324 takes in almost all the light beams from the spheroidal reflecting mirror 302, and the light valves 318, 319, 32
It has a plurality of lenses having shapes substantially similar to 0. Also,
The second lens array plate 305 is the first lens array plate 324
Have a plurality of lenses corresponding to the respective lenses.

The light emitted from the light source 301 is turned into a convergent light beam by the spheroidal reflecting mirror 302, the ultraviolet light and the infrared light are removed by the filter 303, the light is incident on the concave lens 323, and the concave lens 323 bends the incident light beam outward. The light is transmitted to the first lens array plate 324. Each lens of the first lens array plate 324 has a corresponding second lens array plate 3
A light source image is formed in the vicinity of each lens of the first lens array 05, and an image in the vicinity of each lens of the first lens array plate 324 is formed by the second lens array plate 305 and the imaging lenses 310, 311, 312 by each light valve 318, 319, The field lenses 315, 316, and 317 suppress the divergence of light from the imaging lenses 310 and 312, and transmit the light passing through the light valves 318, 319, and 320 to the projection lens system 322. Here, since the direction of the light beam incident on the first lens array plate 324 is bent outward by the concave lens 323, the second lens array plate 305 is
Based on the concept described in the above, suitable dimensions and shapes can be obtained, and a projection display device with a bright reproduced image can be obtained.

[0054]

Since the present invention is configured as described above, it has the following effects.

In the illumination optical system according to the first aspect, when the light source, the reflecting mirror, the first lens plate, and the surface to be illuminated have predetermined sizes, at least one of the lenses of the first lens array plate is provided. The outward eccentricity makes it possible to increase the size of the lens of the second lens array plate, and the light that has passed through the lens of the first lens array plate is incident on the corresponding lens of the second lens array plate. It is possible to increase the ratio of the light to be emitted, and it is possible to efficiently irradiate the light from the light source to the irradiated surface.

When the light source, the second lens plate, and the surface to be illuminated have predetermined sizes, at least one of the lenses of the first lens array plate has an outward eccentricity. The reflector, the first lens array plate, and the distance between the first lens array plate and the second lens array plate can be reduced or shortened without reducing the efficiency, and the light from the light source can be efficiently irradiated with a small illumination optical system device. It is possible to irradiate the surface.

When the light source, the reflecting mirror, the first lens plate and the surface to be illuminated have predetermined sizes, the light from the light source is reflected in the optical path between the reflecting mirror for reflecting the surface to be illuminated and the first lens array plate. Since the concave lens is arranged, it is possible to enlarge the lens of the second lens array plate, and the ratio of the light incident on the corresponding lens of the second lens array plate to the light passing through the lens of the first lens array plate Can be increased, and the light from the light source can be efficiently radiated to the irradiated surface.

When the light source, the second lens plate, and the surface to be illuminated have predetermined sizes, a concave lens is provided in the optical path between the reflecting mirror for reflecting the light from the light source toward the surface to be illuminated and the first lens array plate. The arrangement allows the reflector, the first lens array plate, and the distance between the first lens array plate and the second lens array plate to be small or short without lowering the light use efficiency,
Light from a light source can be efficiently radiated to a surface to be irradiated with a small illumination optical system device.

Further, the light from the spheroidal reflector is radiated from the focal point of the spheroidal reflector into the optical path between the spheroidal reflector for reflecting the light from the light source toward the irradiated surface and the first lens array plate. Since the concave lenses are arranged so that the light incident on the center of each lens is parallel, the first lens array plate and the second lens array plate can be the lens array plates having the same specifications, and an inexpensive illumination optical system can be used. The device allows the light from the light source to be efficiently radiated to the irradiation surface.

In the projection type display device according to the third aspect, the illumination optical system device according to the first or second aspect is used as the illumination optical system device of the light valve, so that the projection type display device having a bright reproduced image. A display device can be obtained.

Further, since the illumination optical system described in claim 1 or 2 is used as an illumination optical system for a light valve, a small projection display device can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of an illumination optical system device according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of a first lens array plate of the illumination optical system device according to the first embodiment of the present invention;

FIG. 3 is a diagram for explaining an effect of the illumination optical system device according to the first embodiment of the present invention;

FIG. 4 is a schematic diagram showing another configuration of the illumination optical system device according to the first embodiment of the present invention;

FIG. 5 is a schematic diagram illustrating a configuration of an illumination optical system device according to Embodiment 2 of the present invention;

FIG. 6 is a diagram for describing an effect of the illumination optical system device according to the second embodiment of the present invention;

FIG. 7 is a schematic diagram showing another configuration of the illumination optical system device according to the second embodiment of the present invention;

FIG. 8 is a schematic diagram showing still another configuration of the illumination optical system device according to Embodiment 2 of the present invention;

FIG. 9 is a schematic diagram showing a configuration of a projection display apparatus according to a third embodiment of the present invention.

FIG. 10 is a diagram for explaining an effect of the projection display device according to the third embodiment of the present invention;

FIG. 11 is a schematic diagram showing another configuration of the projection display device according to the third embodiment of the present invention;

FIG. 12 is a schematic diagram illustrating a configuration of a projection display apparatus according to a fourth embodiment of the present invention.

FIG. 13 is a diagram for explaining effects of the projection display apparatus according to the fourth embodiment of the present invention;

FIG. 14 is a schematic diagram showing another configuration of the projection display apparatus according to the fourth embodiment of the present invention.

FIG. 15 is a schematic diagram showing a configuration of a conventional projection display device.

FIG. 16 is a diagram showing a configuration of a conventional illumination system.

[Explanation of symbols]

20, 301 light source, 40, 41, 42 parabolic reflector, 60 to 69, 75, 304, 324 first lens array plate, 80 to 90, 93 to 98, 305, second lens array plate, 140 irradiated Surface, 50, 302 spheroidal mirror, 120, 121, 123 to 130, 31
5,316,317 Field lens, 100-10
3,310,311,312 imaging lens, 180,1
81,322 projection lens system, 160-164,323
Concave lens, 141, 318, 319, 320 light valve, 217, 220 area that can be captured by the projection lens system, 303 ultraviolet or infrared light absorption or reflection filter, 306 to 309 mirror, 313, 314 dichroic mirror, 321 dichroic prism, 2
00, 203, 208 luminous flux emitted from the parabolic mirror,
213 Beam emitted from spheroidal reflector, 20
7, 210, 212, 215, 219 Light flux emitted from concave lens, 201, 202, 204, 205, 20
6, 209, 211, 216, 218 chief ray, 214
Light rays emitted from the focal point of the spheroidal reflecting mirror and passing through the center of each lens of the first lens array plate, areas that can be captured by the 217 projection lens system, a, c, e, g, i, k, m, o
The distance between the first lens array plate and the second lens array plate,
b, d, f, h, j, p Distance between the second lens array plate and the irradiated surface, n Distance between the second lens array plate and the light valve, l Distance between the imaging lens and the irradiated surface.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Eiichi Tsude 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Mitsui Electric Co., Ltd. (72) Inventor Akira Ouedo 2-2-2 Marunouchi, Chiyoda-ku, Tokyo No. 3 Mitsubishi Electric Corporation

Claims (3)

[Claims] 1. A light source that emits light, a reflecting mirror that reflects light from the light source to an irradiated surface side, and a plurality of lenses disposed in an optical path between the reflecting mirror and the irradiated surface. A first lens array plate, and a second lens array plate having a plurality of lenses disposed in an optical path between the first lens array plate and the surface to be illuminated and corresponding to each lens of the first lens array plate And an illumination optical system in which at least one lens is disposed in an optical path between the second lens array plate and the irradiation surface, at least one of the lenses of the first lens array plate is An illumination optical system having outward eccentricity. 2. A light source that emits light, a reflecting mirror that reflects light from the light source toward an irradiated surface, and a plurality of lenses disposed in an optical path between the reflecting mirror and the irradiated surface. A first lens array plate, and a second lens array plate having a plurality of lenses disposed in an optical path between the first lens array plate and the surface to be illuminated and corresponding to each lens of the first lens array plate And an illumination optical system in which at least one lens is disposed in an optical path between the second lens array plate and the irradiated surface, wherein a concave lens is disposed in an optical path between the reflecting mirror and the first lens array plate. An illumination optical system device characterized in that: 3. An illumination optical system device for a light valve in a projection display device, wherein a video signal is light-modulated using a light valve such as a transmission type liquid crystal and projected onto a screen via a projection lens. A projection display device using the illumination optical system device according to claim 2.