JP2005017379A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the light use efficiency by recycling light. <P>SOLUTION: Object-side focuses of first, second, and third illumination lenses 51, 52, and 53 are placed in the vicinity of a second lens array 4 and are made to coincide with an image-side focus of a first lens array or are arranged in the vicinity of the image-side focus. Light reflected by a stripe-shaped mirror 7 constituted integrally with the second lens array 4 light is made incident again on an illumination lens group (the first, second, and third illumination lenses 51, 52, and 53) and imaged on their image-side focuses, so that light can be recycled by this constitution. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an illuminating device, and more particularly to an illuminating device suitable for a light source of a projection type display device.
[0002]
[Prior art]
Conventionally, various illumination devices have been proposed as illumination systems (light sources) for projection display devices, for example, as shown in FIG.
FIG. 7 is a configuration diagram showing a configuration of an optical system of a conventional general liquid crystal projector type illumination device.
[0003]
The optical system of the conventional general liquid crystal projector type illumination device shown in FIG. 1 includes a light source 81, a parabolic reflector 82 that constitutes a light source unit that generates substantially parallel light, and a first lens that constitutes an integrator unit. The array 83 and the second lens array 84, the illumination lenses 851 to 856 constituting the optical element system, and the PS converter unit for aligning the vibration direction of the light vibrating in all directions of the light source in one direction are configured. A polarization beam splitter 87, color separation mirror 1 (861) to color separation mirror 5 (865) constituting a color separation unit for separating white light into monochromatic RED, GREEN, and BLUE, and an incident side polarizing plate. An image display unit 1 (881), an image display unit 2 (882) composed of a liquid crystal panel, an image display unit 3 (883) composed of an output-side polarizing plate, RED, REEN, includes a color mixing unit 89 for re-combining the BLUE light, and a projection lens unit 810 for enlarging an image displayed on the image display unit on the projection surface.
[0004]
FIG. 8 is a block diagram showing one configuration example of an optical system of an SCR (Sequential Color Recipe and A Method of Scrolling Color) system single plate DLP projector.
[0005]
The conventional general SCR type single-plate DLP projector illumination device shown in FIG. 1 is focused on the light source 91, the elliptical reflector 92 having the light source 91 disposed at the first focal point, and the second focal point of the elliptical reflector 92. Performs color scrolling with a rod integrator 93 that plays a role in reducing in-plane luminance unevenness of the secondary light source, an illumination lens 95 that forms a relay lens portion for imaging the emission-side end surface of the rod integrator 93 on the panel surface, and the like. Therefore, gradation is expressed by changing the angle of the SCR color wheel 96 in which the dichroic mirror is formed in a spiral, the mirror 97 that tilts the direction of the light beam, and the minute micromirror corresponding to the pixel to binary. The image display 98 (DMD portion) for forming the image and the value of one of the two angles of the micromirrors of the DMD portion are projected. Allowed enters the lens, in other 1 value comprises a TIR prism 99 for preventing allowed entrance, and a projection lens 910 for projecting, an enlarged image on a projection surface.
[0006]
Hereinafter, the function of the illumination device of the conventional general SCR single plate DLP projector shown in FIG. 8 will be described.
In the illuminating device shown in the figure, the other end of the rod integrator 93 is mirror-deposited on the incident side end surface except the hole where the secondary light source image can enter, and the complementary color light reflected by the dichroic surface of the SCR color wheel 96 is used. Is configured to be able to reuse the light reflected by the mirror 97, and has the advantage that the light use efficiency can be increased.
[0007]
The conventional projector illumination device as seen from the patent application is the same type of illumination device as the conventional liquid crystal projector shown in FIG. 7, using a lens plate for the integrator optical system, and randomly polarized light as P-polarized light. A technique is disclosed in which a polarization separation prism array is used in a PS converter section that separates into S-polarized light to improve light utilization efficiency (see, for example, Patent Document 1).
[0008]
In addition, a technology is disclosed that includes a dynamic filter that generates light beams of the three primary colors and increases the light utilization efficiency by reusing light rejected by the dynamic filter via an optical recirculator ( For example, see Patent Document 2.)
[0009]
[Patent Document 1]
JP-A-8-304739
[Patent Document 2]
JP 2001-242416 A
[0010]
[Problems to be solved by the invention]
By the way, the above-mentioned conventional illumination device includes the illumination device disclosed in Patent Document 1, as described above, the PS converter (polarization beam splitter 87) for performing polarization conversion by the liquid crystal projector includes a lens array optical system. Since it is used in combination with the first lens array 83 and the second lens array 84 constituting the integrator section, it is necessary to arrange a plurality of PS converters according to the division of the lens array, and the manufacturing process is complicated. In addition, there is a problem that the cost becomes expensive.
[0011]
Further, in the illumination device of the type that uses up to the above-mentioned complementary color light to increase the light utilization efficiency, the rod integrator 93 used in the SCR type single plate DLP projector (as described above, the secondary light source image on the incident side end face). In the case of a device that recycles light in a portion other than the hole where the light can enter, the light is returned by the amount of light that returns to the hole in the mirror. There has been a problem that the use efficiency of the system is lowered. Furthermore, the illumination device disclosed in Patent Document 2 uses a motor to rotate the spiral color wheel, and the device configuration is complicated.
[0012]
The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide an illumination device having a simple configuration that can improve the light utilization efficiency by recycling light.
[0013]
[Means for Solving the Problems]
In order to solve the above-described problems, an illuminating device according to the present invention is a illuminating device that performs illumination with a light beam from a light source. An element, a second optical element positioned downstream of the first optical element, and a plurality of lenses regularly arranged in a plane; and a plurality of strip-shaped mirrors positioned immediately after the second optical element. An arrayed third optical element, a fourth optical element positioned at a subsequent stage of the third optical element, one or more lenses arranged at a predetermined position in an optical path, and a subsequent stage of the fourth optical element; And a fifth optical element having selective reflectivity and capable of being inclined at a predetermined angle with respect to the optical axis.
[0014]
With this configuration, the light reflected by the third optical element, which is configured integrally with the second optical element and in which a plurality of strip-shaped mirrors are arranged, is arranged again at a predetermined position in the optical path. Since the light enters the fourth optical element and forms an image on the image side focal point, it is possible to realize an illuminating device that can recycle the light and increase the light use efficiency.
[0015]
In the illumination device, the object-side focal positions of the second optical element and the fourth optical element may be positioned at the image-side focal position of the first optical element or in the vicinity of the focal position. Is possible.
[0016]
With this configuration, the first optical element can function as an integrator, and a secondary light source image of the first optical element can be arranged on the second optical element. The light emitted from each of the plurality of lenses can be substantially parallel light whose principal ray is the light emitted from the fourth optical element and directed toward the image side focal point.
[0017]
In the illumination device, the mirror array of the third optical element can be deposited on the surface of the second optical element, and the second optical element and the third optical element can be configured as an integral structure. It is.
[0018]
With this configuration, it is possible to realize a lighting device with low manufacturing cost.
[0019]
In the illumination device, the second optical element can be removed from the optical path.
[0020]
With this configuration, it is possible to realize a lighting device that is small and inexpensive to manufacture.
[0021]
In the illumination device, the object-side focal position of the fourth optical element may be positioned at the image-side focal position of the first optical element or in the vicinity of the focal position.
[0022]
With this configuration, the secondary light source image arranged on the first optical element can be superimposed on the image-side focal point of the fourth optical element, and light emitted from each of the plurality of lenses of the first optical element. Can be made to be substantially parallel light with the light toward the image-side focal point after emission of the fourth optical element as the main light source.
[0023]
In the illumination device, a light source image generated by the reflected light from the fifth optical element having the selective reflectivity is a plurality of light generated by the first optical element in the vicinity of the image-side focal point of the first optical element. The fifth optical element can be tilted with respect to the optical axis so as to form a gap between the light source images.
[0024]
With this configuration, the reflected light from the fifth optical element (that is, the light that has not passed through the fifth optical element) is reflected by the mirror of the third optical element, and further incident on the fourth optical element. Thus, it is possible to form an image on the image-side focal point, so that it is possible to construct a part of the light recycling process with a simple configuration.
[0025]
In the illumination device, the third optical element in which the plurality of strip-shaped mirrors are arranged is installed at a light source image position generated by reflected light from the fifth optical element, or in the vicinity of the light source image position, The light reflected by the third optical element can be configured to return to the fifth optical element or the vicinity of the fifth optical element.
[0026]
With this configuration, the reflected light from the fifth optical element (that is, the light that has not passed through the fifth optical element) is reflected by the mirror of the third optical element, and further incident on the fourth optical element. Thus, it is possible to form an image at the focal point on the image side and return it to the vicinity of the fifth optical element, so that it is possible to construct a light recycling process with a simple configuration.
[0027]
In the illumination device, the fifth optical element can be configured by an optical element having a plurality of different dichroic coats in the plane.
[0028]
With this configuration, each reflected light from the fifth optical element for each of the three primary colors of light is returned to the fifth optical element again, and this returned light is then transmitted through the fifth optical element. Since the material to be caulked is irradiated, it is possible to realize an illuminating device that can effectively recycle light and increase the utilization efficiency of light source light.
[0029]
In the illumination device, the fifth optical element can be formed of a reflective circularly polarizing element.
[0030]
With this configuration, each of the reflected light from the fifth optical element for each of the clockwise circularly polarized light and the counterclockwise circularly polarized light can be returned again to the fifth optical element. Since the light is reflected by the third optical element and converted into circularly polarized light opposite to each other, it is possible to transmit the fifth optical element and complete the light recycling process. Thus, it is possible to realize an illuminating device that can increase the use efficiency of light.
[0031]
Further, in the illuminating device, the fifth optical element is formed of a reflective linearly polarizing element, and an optical path is reflected from the fifth optical element to the third optical element in which the plurality of strip-shaped mirrors are arranged. It is possible to arrange a quarter retardation plate inside.
[0032]
According to this configuration, the linearly polarized light in a certain direction included in the natural light from the light source can be used for the illumination light, and the linearly polarized light orthogonal to the linearly polarized light can also be used as the illumination light. It is possible to realize a lighting device that can increase the use efficiency of the projector.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of a lighting device of the present invention will be described in detail with reference to the drawings.
[0034]
FIG. 1 is a configuration diagram showing a configuration of an optical system of an illumination apparatus according to an embodiment of the present invention.
In the drawing, the optical system of the illumination device of the present embodiment includes a light source 1, a reflector 2 having a paraboloid, and a first lens array 3 (first lens array) regularly arranged in a plane. 1 optical element), a second lens array 4 (second optical element) for capturing a secondary light source image, and a first illumination lens 51 and a second illumination constituting a fourth optical element for forming an image at the focal point. The lens 52, the third illumination lens 53, the selective reflection element 6 (fifth optical element) having selective reflectivity on the image side focal plane of the second illumination lens 52 constituting the fourth optical element, and a plurality of strip shapes And a strip-shaped mirror 7 (third optical element) integrally formed with the second lens array 4 (second optical element). The light source 1 can be composed of an ultrahigh pressure mercury lamp or the like.
[0035]
Hereinafter, functions of the lighting apparatus according to the present embodiment will be described.
Light emitted from the light source 1 is reflected by the reflector 2 having a paraboloid, becomes substantially parallel light, and enters the first lens array 3 (first optical element).
The first lens array 3 is an optical element in which a plurality of positive lenses are regularly arranged in a plane, and the image-side focal point of each lens of the first lens array 3 is the second lens array 4 (second optical element). Therefore, secondary light source images corresponding to the plurality of positive lenses of the first lens array 3 are arranged in the second lens array 4.
[0036]
Each lens of the second lens array 4 is arranged so as to capture the secondary light source image, and at the same time, the object side focal point of the second lens array 4 is configured to be in the vicinity of the first lens array 3. . The light emitted from the second lens array 4 is composed of one or a plurality of lenses, and is focused on the image-side focal point by the fourth optical element having a positive power. Since it also has the effect of superimposing the lens portion in one place, it functions as an integrator.
[0037]
At this time, the object-side focal point of the fourth optical element (more specifically, the first illumination lens 51, the second illumination lens 52, and the third illumination lens 53) is placed in the vicinity of the second lens array 4, By aligning with the image side focal point of one lens array 3 or arranging it in the vicinity of the image side focal point, the light emitted from each lens of the second lens array 4 It becomes substantially parallel light with the light traveling toward the image side focal point as the principal ray.
[0038]
Further, since the fifth optical element 6 having selective reflectivity is arranged on the image side focal plane of the fourth optical element, the reflected light from the fifth optical element 6 is reflected from the back side to the fourth optical element. The light is incident again, and a light source image is generated at an axially symmetric position with respect to the object-side focal plane (that is, the original secondary light source) of the fourth optical element and the optical axis.
[0039]
Here, it is possible to shift the light source image between the secondary light source images by the first lens array 3 by tilting the fifth optical element 6 by a predetermined angle. A strip-shaped mirror 7 (third optical element) in which a plurality of strip-shaped mirrors are disposed in a plane is disposed at this position. The light reflected by the strip-shaped mirror 7 (third optical element) is incident on the lens group (first illumination lens 51, second illumination lens 52, and third illumination lens 53) constituting the fourth optical element again. Since the image is focused on the image side focal point, the light is recycled.
[0040]
FIG. 2 is a configuration diagram showing an example of an integrated configuration of the second lens array (second optical element) and the strip-shaped mirror (third optical element) of the illumination apparatus according to the embodiment of the present invention.
As shown in the figure, the second lens array 4 (second optical element) and the strip-shaped mirror 7 (third optical element) are configured as a single unit, thereby reducing the cost of the apparatus.
[0041]
FIG. 3 is a configuration diagram showing another configuration of the optical system of the illumination device according to the embodiment of the present invention.
In the optical system of the illuminating device shown in the figure, the light emitted from the light source 1 is reflected by the paraboloid reflector 2 to become substantially parallel light, and enters the first lens array 3 (first optical element).
[0042]
The illuminating device shown in the figure includes the first lens array 3 similar to the illuminating device shown in FIG. 1, and the second lens array 4 (which is integrally formed with the strip mirror 7 (third optical element)). The second optical element) is omitted.
[0043]
The first lens array 3 is an optical element in which a plurality of positive lenses are regularly arranged in a plane, like the illumination device shown in FIG. A secondary light source image corresponding to each lens array of the first lens array 3 is arranged on the image side focal plane of each lens of the first lens array 3.
[0044]
A fourth optical element having one or a plurality of lenses (here, the first illumination lens 51, the second illumination lens 52, and the third illumination lens 53) having positive power so as to capture the secondary light source image. Elements are arranged, and the object-side focal point is designed to coincide with or be close to the image-side focal plane of the first lens array 3. Therefore, it has the effect of superimposing the secondary light source image on the image-side focal point of the fourth optical element, and the light emitted from each lens of the first lens array 3 is image-side after being emitted from the fourth optical element. It becomes substantially parallel light with the light toward the focal point as the principal ray.
[0045]
Since the selective reflection element 6 (fifth optical element) having selective reflectivity is disposed on the image side focal plane of the fourth optical element, the reflected light from the selective reflection element 6 (fifth optical element) is Then, the light enters the fourth optical element again from the back side, and a light source image is generated at a position axially symmetric with respect to the object-side focal plane of the fourth optical element (that is, the original secondary light source) and the optical axis.
[0046]
Here, by tilting the fifth optical element 6 by a predetermined angle, the light source image can be shifted between the secondary light source images by the first lens array 3, and a plurality of strip-shaped mirrors are provided at this position. A strip-shaped mirror 7 (third optical element) disposed in the plane is disposed.
[0047]
The light reflected by the third optical element again enters the fourth optical element and forms an image at the image-side focal point, so that the light is recycled. However, when the light reflected by the strip-shaped mirror 7 (third optical element) is incident on the fourth optical element again and forms an image at the image side focal point, the selective reflection element 6 (fifth optical element) again. If the light is reflected, the light utilization efficiency cannot be improved. Therefore, it is necessary to configure the above-described light so as to be transmitted through the selective reflection element 6.
[0048]
FIG. 4 is a configuration diagram showing one example of the selective reflection element (fifth optical element) of the illumination apparatus according to the embodiment of the present invention.
The selective reflection element 6 (fifth optical element) shown in the figure is provided with a plurality of different dichroic coats in the image plane. Also, here, a color wheel that is dichroic coated for the color scroll method is used.
[0049]
The surface of this color wheel is coated with a dichroic filter in the Archimedean spiral shape disclosed in the above-mentioned Patent Document 2, thereby generating a color scroll on the display element. For example, if the color band of the dichroic filter is arranged in the order of the RED dichroic filter 61, the GREEN dichroic filter 62, and the BLUE dichroic filter 63 from the upper part of the color wheel surface at a certain moment, the RED dichroic filter 61 is hit. The transmitted light transmits only RED light (red light) and reflects GREEN light (green light) and BLUE light (blue light).
[0050]
Similarly, the light hitting the GREEN dichroic filter 62 transmits only the GREEN light, reflects the RED light and BLUE light, the light hitting the BLUE dichroic filter 63 transmits only the BLUE light, and RED. Light and green light are reflected.
[0051]
As described above, each of the lights reflected by the dichroic filters is re-reflected by the strip-shaped mirror 7 (third optical element) and returns to the selective reflection element 6 (fifth optical element) again.
[0052]
When the BLUE light reflected by the RED dichroic filter 61 returns to the selective reflection element 6 (fifth optical element) again, an image is formed in the vicinity of the BLUE dichroic filter 63, and the BLUE dichroic filter 63. Therefore, the amount of light (illumination light) transmitted through the selective reflection element 6 (fifth optical element) increases, and the light use efficiency can be increased here.
[0053]
Similarly, when the GREEN light reflected by the RED dichroic filter 61 returns to the selective reflection element 6 (fifth optical element) again, an image is formed in the vicinity of the GREEN dichroic filter 62, and this GREEN Since it is configured to transmit the dichroic filter 62, the amount of light (illumination light) transmitted through the selective reflection element 6 (fifth optical element) is increased, and the use efficiency of light can be increased here.
[0054]
Similarly, when RED light reflected by the GREEN dichroic filter 62 returns to the selective reflection element 6 (fifth optical element) again, an image is formed in the vicinity of the RED dichroic filter 61, and this RED Since it is configured to transmit the dichroic filter 61, the amount of light (illumination light) transmitted through the selective reflection element 6 (fifth optical element) is increased, and the use efficiency of light can be increased here.
[0055]
Similarly, when the BLUE light reflected by the GREEN dichroic filter 62 returns to the selective reflection element 6 (fifth optical element) again, an image is formed in the vicinity of the BLUE dichroic filter 63, and this BLUE Since it is configured to transmit the dichroic filter 63, the amount of light (illumination light) transmitted through the selective reflection element 6 (fifth optical element) increases, and the use efficiency of light can be increased here.
[0056]
Similarly, when the RED light reflected by the BLUE dichroic filter 63 returns to the selective reflection element 6 (fifth optical element) again, an image is formed in the vicinity of the RED dichroic filter 61, and this RED dichroic is formed. Since the filter 61 is configured to transmit, the amount of light (illumination light) transmitted through the selective reflection element 6 (fifth optical element) increases, and the use efficiency of light can be increased here.
[0057]
Similarly, when the green light reflected by the blue dichroic filter 63 returns to the selective reflection element 6 (fifth optical element) again, an image is formed in the vicinity of the green dichroic filter 62 and this green Since it is configured to transmit the dichroic filter 62, the amount of light (illumination light) transmitted through the selective reflection element 6 (fifth optical element) is increased, and the use efficiency of light can be increased here.
[0058]
FIG. 5 is a configuration diagram showing another example of the selective reflection element (fifth optical element) of the illumination apparatus according to the embodiment of the present invention.
The selective reflection element 6 (fifth optical element) shown in the figure is a reflective circularly polarizing element. One example of the reflective circularly polarizing element is cholesteric liquid crystal. Since the light from the light source is natural light (indefinite polarization), the clockwise circularly polarized light and the counterclockwise circularly polarized light exist at a ratio of almost half, but the cholesteric liquid crystal transmits one circularly polarized light and the other is It has the property of reflecting.
[0059]
Therefore, if a cholesteric liquid crystal that transmits clockwise circularly polarized light and reflects counterclockwise circularly polarized light is disposed as the selective reflection element 6 (fifth optical element), the clockwise circularly polarized light of the incident light is transmitted. , Counterclockwise circularly polarized light is reflected. The reflected left-handed circularly polarized light is re-reflected by the strip-shaped mirror 7 (third optical element) and returns to the selective reflection element 6 (fifth optical element) again. However, when circularly polarized light is reflected, the rotation direction is reversed. Therefore, the light that has returned to the selective reflection element 6 (fifth optical element) again becomes clockwise circularly polarized light, and is transmitted through the selective reflection element 6 (fifth optical element). To do. Thereby, since the light quantity of the light (illumination light) which permeate | transmits the selective reflection element 6 (5th optical element) can be increased, the illuminating device with high utilization efficiency of light can be comprised.
[0060]
FIG. 6 is a configuration diagram showing another example of the selective reflection element (fifth optical element) of the illumination apparatus according to the embodiment of the present invention.
The selective reflection element 6 (fifth optical element) shown in the figure is a reflective linearly polarizing element. Examples of the reflective linearly polarizing element include a wire grid polarizing plate and DBEF from 3M. Since the light from the light source is natural light (indefinite polarization), linearly polarized light in a certain direction and linearly polarized light in a direction perpendicular to it exist at a ratio of almost half, but a reflective linear polarizer is It has the property of transmitting linearly polarized light in a certain direction and reflecting linearly polarized light in a direction perpendicular to this direction.
[0061]
Therefore, if a reflective linear polarization element that transmits P-polarized light and reflects S-polarized light with respect to the fifth optical element is arranged as the selective reflection element 6 (fifth optical element), P-polarized light in the incident light is The light passes through the selective reflection element 6 (fifth optical element), and the S-polarized light is reflected. The reflected S-polarized light is re-reflected by the strip mirror 71 (third optical element) and returns to the selective reflection element 6 (fifth optical element) again, but the quarter-wave plate 72 ( (1/4 phase difference plate) is arranged so that its optical axis is 45 ° with respect to the polarization axis of linearly polarized light. As a result, the linearly polarized light becomes circularly polarized light. The light passes through the selective reflection element 6 (fifth optical element). As a result, the amount of light transmitted through the selective reflection element 6 (fifth optical element) can be increased, so that an illumination device with high light utilization efficiency can be configured.
[0062]
【The invention's effect】
As described above, according to the illumination device of the present invention, the light that has not been used as illumination light is recycled by the optical system to be used as illumination light again, thereby increasing the amount of illumination light and improving the light use efficiency. It is possible to realize a lighting device with a simple configuration that can increase the brightness.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing a configuration of an optical system of an illumination apparatus according to an embodiment of the present invention.
FIG. 2 is a configuration diagram showing an example of an integrated configuration of a second lens array (second optical element) and a strip-shaped mirror (third optical element) of the illumination apparatus according to the embodiment of the present invention.
FIG. 3 is a configuration diagram showing another configuration of the optical system of the illumination device according to the embodiment of the present invention.
FIG. 4 is a configuration diagram showing one example of a selective reflection element (fifth optical element) of the illumination apparatus according to the embodiment of the present invention.
FIG. 5 is a configuration diagram showing another example of the selective reflection element (fifth optical element) of the illumination apparatus according to the embodiment of the present invention.
FIG. 6 is a configuration diagram showing another example of the selective reflection element (fifth optical element) of the illumination apparatus according to the embodiment of the present invention.
FIG. 7 is a configuration diagram showing a configuration of an optical system of a conventional general liquid crystal projector type illumination device.
FIG. 8 is a configuration diagram showing one configuration example of an optical system of an SCR (Sequential Color Recipeture and A Method of Scrolling Color) system single plate DLP projector.
[Explanation of symbols]
1 Light source
2 reflector
3 First lens array (first optical element)
4 Second lens array (second optical element)
6 Selective reflection element (5th optical element)
7,71 Strip mirror (third optical element)
51 1st illumination lens (4th optical element)
52 Second illumination lens (fourth optical element)
53 Third illumination lens (fourth optical element)
61 RED dichroic filter (5th optical element)
62 GREEN dichroic filter (5th optical element)
63 BLUE dichroic filter (5th optical element)
72 1/4 wavelength plate (1/4 retardation plate)

Claims (10)

In an illumination device that illuminates with a light beam from a light source,
A first optical element in which a plurality of lenses that receive light from the light source are regularly arranged in a plane;
A second optical element positioned downstream of the first optical element and having a plurality of lenses regularly arranged in a plane;
A third optical element located immediately after the second optical element and arranged with a plurality of strip-shaped mirrors;
A fourth optical element that is located at a subsequent stage of the third optical element, and in which one or more lenses are arranged at predetermined positions in the optical path;
A fifth optical element that is located downstream of the fourth optical element and has selective reflectivity and can be inclined at a predetermined angle with respect to the optical axis;
An illumination device comprising: The object-side focal position of the second optical element and the fourth optical element is located at the image-side focal position of the first optical element or in the vicinity of the focal position. Lighting device. 2. The mirror arrangement of the third optical element is vapor-deposited on the surface of the second optical element, and the second optical element and the third optical element are configured as an integral structure. Item 3. The lighting device according to Item 2. 4. The illumination device according to claim 1, wherein the second optical element is removed from the optical path. 5. 5. The illumination device according to claim 4, wherein an object-side focal position of the fourth optical element is located at an image-side focal position of the first optical element or in the vicinity of the focal position. A light source image generated by reflected light from the fifth optical element having the selective reflectivity can be formed in a gap between a plurality of light source images generated by the first optical element in the vicinity of the image-side focal point of the first optical element. The illuminating device according to claim 1, wherein the fifth optical element can be tilted with respect to the optical axis. The third optical element in which the plurality of strip-shaped mirrors are arranged is installed at a light source image position generated by reflected light from the fifth optical element or in the vicinity of the light source image position, and reflected by the third optical element. The illumination device according to any one of claims 1 to 6, wherein light is configured to return to the fifth optical element or a vicinity of the fifth optical element. The lighting device according to any one of claims 1 to 7, wherein the fifth optical element includes an optical element having a plurality of different dichroic coats in the surface. The illumination device according to any one of claims 1 to 7, wherein the fifth optical element is formed of a reflective circularly polarizing element. The fifth optical element is composed of a reflective linearly polarizing element, and a ¼ phase difference is reflected in the optical path that reflects from the fifth optical element to the third optical element in which the plurality of strip-shaped mirrors are arranged. 8. A lighting device according to claim 1, further comprising a plate.

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