JP2000330195A - Illuminator and liquid crystal projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make reducible the aperture of a projection lens in a state small in the spatial distance from a light source while increasing the availability of light and to miniaturize a projector by setting a spheroidal mirror as a reflection mirror, disposing a light emitting source in the vicinity of the 1st focal point of the mirror, setting a 2nd focal point in the vicinity of a body to be projected and disposing a lens array in luminous flux converged to be condensed onto the 2nd focal point. SOLUTION: The spheroidal mirror 4 has the 1st focal point F1 and the 2nd focal point F2, is formed to be open in a length a little shorter than the half of the 1st focal point F1 side on the mirror 4, and condenses light from the light emitting source 3 disposed in the vicinity of the 1st focal point F1 onto the 2nd focal point F2 side. The 2nd focal point F2 is set to the vicinity of a liquid crystal panel 1. An integrator optical system 5 is formed of the lens array 7 whose shape is nearly similar to the shape of the liquid crystal panel 1, which is formed in rectangular shape whose ratio is 4:3 and where plural lens elements 6 are two-dimensionally arrayed. The lens array 7 is disposed between a middle point between the 1st and the 2nd focal points F1 and F2 and the 2nd focal point F2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination device suitable for illuminating a rectangular projection object such as a liquid crystal panel, and a liquid crystal projector using the illumination device.

[0002]

2. Description of the Related Art As an illumination optical system for uniformly illuminating a rectangular projection object such as a liquid crystal panel, a conventional illumination optical system has been proposed.
An integrator optical system combining two lens arrays is known, for example, from Japanese Patent Application Laid-Open No. 3-111806.

The integrator optical system disclosed in the publication and the like constitutes a first lens array by using a light beam from a light source having a reflector such as a parabolic reflector, an elliptical reflector, or a hyperboloid reflector. The secondary light source images are formed by being divided by a plurality of rectangular condensing lenses, and a plurality of condensing lenses corresponding to the plurality of rectangular condensing lenses of the first lens array are formed. An image is superimposed and formed on the same projection object via a second lens array having an optical lens.
According to such an integrator optical system, it is described that the utilization efficiency of the light from the light source is improved and the light intensity distribution on the surface of the projection target can be made substantially uniform. In particular,
The light utilization efficiency and intensity are formed by forming the shape of each condenser lens in the first and second lens arrays into a rectangular shape having a ratio of 4: 3, for example, in accordance with the aspect ratio of the rectangular projection object. The distribution can be made uniform.

[0004]

However, in the case of the conventional example using such an integrator optical system, it is effective in making the intensity distribution uniform on the object to be projected. Efficiency and miniaturization of the projection lens diameter are not yet sufficient, and there is room for improvement. That is, if the spatial distance from the light source to the projection target is sufficiently long, it is possible to reduce the diameter of the projection lens.
It is not possible to reduce the size of the entire lighting device or the liquid crystal projector.

Accordingly, the present invention makes it possible to reduce the aperture of the projection lens in a state in which the spatial distance from the light source to the projection target is short while improving the efficiency of light utilization, thereby achieving further miniaturization. It is an object to provide a lighting device and a liquid crystal projector.

[0006]

According to a first aspect of the present invention, there is provided a lighting apparatus, wherein a light emitting source is provided near a first focal point, and a second focal point is set near a rectangular projection object. And a plurality of spheroidal mirrors disposed between the intermediate point between the first and second focal points and the second focal point, and formed in a rectangular shape substantially similar to the shape of the projection target. A lens array in which lens elements are two-dimensionally arranged, a plurality of secondary light source images are divided from light emitted from the light emitting source, and each of the secondary light source images is superimposed and projected on the projection target.

[0007] Accordingly, by using the spheroidal mirror as the reflecting mirror in the light source device, disposing the light emitting source near the first focal point and setting the second focal point near the projection target, the light emitted from the light emitting source can be used. In addition to improving the efficiency, by disposing a lens array of a so-called integrator optical system in the light beam converged by being converged toward the second focal point, it is possible to cover the light beam without using a separate condensing lens or the like. To minimize the spread of the secondary light source image, which forms a virtual light source for illuminating the projection object, and to reduce the diameter of the projection lens in a state where the spatial distance from the light emitting source to the projection target is short. It is an effective configuration. In the present invention, in particular, when the light source in the light source device can be regarded as a point light source, the secondary light source image itself can be regarded as a point light source, so that the integrator optical system does not require the second lens array. , Can be realized.

According to a second aspect of the present invention, there is provided a lighting device, comprising: a light-emitting source; and a spheroidal mirror having the light-emitting source disposed near a first focal point and having a second focal point set near a rectangular projection object. A plurality of first lens elements disposed between the intermediate point between the first and second focal points and the second focal point and formed in a rectangular shape substantially similar to the shape of the projection target; A first lens array arranged two-dimensionally and a plurality of second lens elements respectively arranged at a focal position of the first lens element and corresponding to the first lens element are two-dimensionally arranged. And a second lens array for projecting light beams transmitted through the respective second lens elements so as to be superimposed on the projection target.

[0009] Therefore, by using a spheroidal mirror as the reflecting mirror in the light source device, disposing the light emitting source near the first focal point and setting the second focal point near the projection target, the light emitted from the light emitting source can be used. In addition to improving the efficiency, by disposing a lens array of a so-called integrator optical system in the light beam converged by being converged toward the second focal point, it is possible to cover the light beam without using a separate condensing lens or the like. To minimize the spread of the secondary light source image, which forms a virtual light source for illuminating the projection object, and to reduce the diameter of the projection lens in a state where the spatial distance from the light emitting source to the projection target is short. It is an effective configuration.

[0010] According to a third aspect of the present invention, there is provided a lighting device, comprising: a light-emitting source; a spheroidal mirror having the light-emitting source disposed near a first focal point and having a second focal point set near a rectangular projection object. A plurality of first lens elements disposed between the intermediate point between the first and second focal points and the second focal point and formed in a rectangular shape substantially similar to the shape of the projection target; A first lens array arranged two-dimensionally and a plurality of second lens elements respectively arranged at a focal position of the first lens element and corresponding to the first lens element are two-dimensionally arranged. And a divergent effect on the light transmitted through the second lens array, and the luminous flux transmitted through the first and second lens elements is superimposed on the projection target. And a second lens that projects light.

[0011] Therefore, by using a spheroidal mirror as the reflecting mirror in the light source device, disposing the light emitting source near the first focal point and setting the second focal point near the projection target, the light emitted from the light emitting source can be used. In addition to increasing the efficiency, by disposing the first lens array of a so-called integrator optical system in the light beam focused by being focused toward the second focal point, a separate focusing lens or the like is particularly used. The spread of the secondary light source image, which forms a virtual light source for illuminating the projection object without irradiating, can be reduced as much as possible, and in a state where the spatial distance from the light emitting source to the projection object is short, the projection lens diameter is reduced This is an effective configuration for performing In particular, since the second lens having a diverging effect, such as a concave lens, is used, the spread of the secondary light source image forming a virtual light source for irradiating the projection target can be further reduced, and the projection lens This is a more effective configuration for reducing the diameter.

According to a fourth aspect of the present invention, in the illuminating device according to the third aspect, the second lens has a function of converting the main light beam focused by the spheroidal mirror toward the second focal point into a substantially parallel light beam. Is provided on the emission side of the second lens, for each light flux having a random polarization direction to be aligned with only one of the P-polarized component and the S-polarized component and emitted.

Therefore, when only one type of polarized light having only a P-polarized light component or an S-polarized light component can be used, such as a liquid crystal panel of a type that modulates polarized light as a projection target, light emission that emits a light beam having a random polarization direction is obtained. In the source, about half of the light source light will not be used, and the utilization efficiency of the light source light will be poor.However, since the light source is provided with a polarization conversion element and emitted with only one of the polarization components, it is emitted. The use efficiency of the light source light can be improved. At this time, since the light flux substantially parallelized by the second lens is made incident on the polarization conversion element to align the polarization directions, the efficiency of the polarization conversion is high.

Here, the polarization conversion element may be a combination configuration of a polarization beam splitter, a reflection prism and a half-wave plate, and may be, for example, a plurality of array combination configurations with a pitch corresponding to the second lens element. Is used.

According to a fifth aspect of the present invention, in the liquid crystal projector, at least one liquid crystal panel on which an image to be projected is formed by the information display system, and the liquid crystal panel is illuminated as an object to be projected. And a projection lens system for projecting an image of the liquid crystal panel on a screen.

Therefore, the liquid crystal panel is illuminated by using the illuminating device according to any one of claims 1 to 4, so that the liquid crystal panel is illuminated under illumination with high light use efficiency as a whole. The projection can be made on the screen by a projection lens system having a small diameter, and the size of the entire liquid crystal projector can be reduced.

Here, the liquid crystal panel may be a reflection type liquid crystal panel or a transmission type liquid crystal panel. In the case of color display, usually, three primary colors, RGB
(Red, green, blue) three liquid crystal panels,
For example, it is used with a spectroscopic element such as a dichroic prism or a mirror.

[0018]

FIG. 1 shows a first embodiment of the present invention.
It will be described based on. This embodiment corresponds to the first aspect of the present invention, and FIG. 1 shows an outline of the illumination device A1.

This illumination device A1 has a rectangular liquid crystal panel 1 having a vertical and horizontal aspect ratio of 4: 3 as an object to be projected, and has a front surface for condensing light to each liquid crystal element. A condenser lens 2 is provided. For such a liquid crystal panel 1, the lighting device A of the present embodiment is used.
Reference numeral 1 denotes a light source 3 in the form of a point light source, a spheroid mirror 4 for a reflecting mirror in which the light source 3 is provided, and an integrator optical system 5.

The spheroid mirror 4 has a first focal point F1 and a second focal point F2, and is formed with an opening slightly shorter than half of the first focal point F1 side. The light condensing function of condensing the light from the disposed light emitting source 3 toward the second focal point F2 is shown. Here, the second focal point F2 is set near the liquid crystal panel 1. Further, in the present embodiment, the integrator optical system 5 has a plurality of rectangular shapes having a ratio of 4: 3 substantially similar to the shape of the liquid crystal panel 1 (a rectangular shape having an aspect ratio of 4: 3). The lens elements 6 are formed by a lens array 7 arranged two-dimensionally. That is, the first of the so-called integrator optical system
, And the lens array 7 includes the light emitting source 3.
A secondary light source image 8 is divided and formed for each lens element 6 from the light emitted from the light source and reflected by the spheroidal mirror 4.
Therefore, 9 is the virtual light source surface. Here, the lens array 7 is located between the intermediate point between the first and second focal points F1 and F2 and the second focal point F2 (in the present embodiment, the second focal point F2 near the intermediate point between the first and second focal points F1 and F2). (Closer position).

With such a configuration, the light emitted from the light emitting source 3 and efficiently reflected by the spheroidal mirror 4 enters the lens array 7, and the secondary light source image 8 is divided and formed by each lens element 6. You. Here, by turning the optical axis of the secondary light source image 8 formed by each lens element 6 toward the center of the liquid crystal panel 1 by the spheroid mirror 4, individual lens elements forming a rectangular shape at a ratio of 4: 3 Illumination is performed in such a manner that the light beams passing through 6 are superimposed on the liquid crystal panel 1 respectively. In this case, the lens array 7 is disposed at a position where the light beam is narrowed down by the spheroidal mirror 4, and the spread of the secondary light source image 8, which forms a virtual light source for irradiating the liquid crystal panel 1, is separated by a separate condenser lens. It is possible to reduce the size of the projection lens without using any other means, which is effective for reducing the diameter of the projection lens (not shown).

A second embodiment of the present invention will be described with reference to FIG. The same portions as those described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted (the same applies to each of the following embodiments). This embodiment corresponds to the second aspect of the present invention.

In the illuminating device A2 of the present embodiment, the integrator optical system 10 includes the second lens array 7 and the second lens arranged near each focal position (virtual light source surface 9) of the first lens element 6 thereof. And a lens array 11. Although the second lens array 11 is smaller in size than the first lens array 7, the second lens array 11 has the same number and similar shape corresponding to each first lens element 6 (hence, a rectangular shape having a ratio of 4: 3). Are arranged two-dimensionally.

In such a configuration, the light beams that have passed through the first lens element 6 and the corresponding second lens element 12 are respectively radiated so as to be superimposed on the liquid crystal panel 1. Here, in principle, only the configuration as shown in FIG. 1 (only the first lens array 7) may be used, but in reality, the light emitting source 3 is not a point light source but has a certain volume. Therefore, each secondary light source image 8 also has a volume instead of a point light source. However, by providing the second lens array 11 having the second lens element 12 individually at this position, the convergence is improved. And projecting it toward the liquid crystal panel 1, it is possible to obtain a good illumination state.

Also in the case of the present embodiment, the liquid crystal panel 1
Of the secondary light source image 8, which forms a virtual light source for irradiating light, is effective in reducing the aperture of a projection lens (not shown).

FIGS. 3 and 4 show a third embodiment of the present invention.
It will be described based on. This embodiment is described in claims 3 and 4.
This corresponds to the described invention. In the illumination device A3 of the present embodiment, the integrator optical system 13 has the first lens array 7 and the second lens array 11 arranged near the focal position (virtual light source surface 9) of the first lens array 7 and the second lens array 11 having a diverging effect. Lens 14, polarization conversion element 15, and condenser lens 1 as a lens
6. Here, the second embodiment of the present invention
The lens array 11 is formed stepwise so as to correct peripheral lens aberration.

The concave lens 14 also has the function of converting the main light beam focused by the spheroid mirror 4 toward the second focal point F2 into a substantially parallel light beam. The polarization conversion element 15 disposed immediately after the concave lens 14 is a polarization conversion element 15 that, for each light beam (P + S) whose polarization direction is randomized by the concave lens 14, only one of the P polarization component and the S polarization component. This is for emitting the light in accordance with the components. The condenser lens 16 has a function of condensing light beams corresponding to the respective secondary light source images 8 whose polarization components have been aligned to S-polarized light components by the polarization conversion element 15, and each optical axis of these light beams is The focal length is set so as to head toward the center of No. 1. Here, as shown in FIG. 4, the polarization conversion element 15 includes a polarization beam splitter 17, a reflection prism 18, and a half-wave plate 1
9 are provided in the form of an array by providing each lens element 6 and 12 as a unit, and the P-polarized light component is
7 and transmitted through a half-wave plate 20 and rotated by 90 degrees.
The light is converted into a polarized light component, and the S-polarized light component is reflected by the polarizing beam splitter 17 and the reflecting prism 18 as it is and emitted, so that all the light is adjusted to the S-polarized light component.

The light beam emitted from the light emitting source 3 is emitted with the light beam having a random polarization direction aligned with only the S-polarized light component by the polarization conversion element 15. In this polarization conversion processing, the light incident on the polarization beam splitter 17 is parallel. The light beam has higher conversion efficiency. In this regard,
In the present embodiment, the polarization conversion processing is performed by the polarization conversion element 15 after the parallel light flux is formed by the concave lens 14, so that the conversion efficiency is high and the light flux from the first lens array 7 is narrowed. Therefore, the size of the polarization conversion element 15 can be reduced.

Also in the case of the present embodiment, the liquid crystal panel 1
Of the secondary light source image 8, which forms a virtual light source for irradiating light, is effective in reducing the aperture of a projection lens (not shown). In particular, the concave lens 14 exhibiting a diverging effect immediately after the second lens array 11
Is used, the spread of the secondary light source image 8 formed by the first lens array 7 can be made smaller (it can be narrowed down), and the diameter of the projection lens (not shown) is made smaller. Therefore, the configuration becomes more effective.

By the way, when the present embodiment is implemented,
As shown in FIG. 5, the condenser lens 16 is connected to the polarization conversion element 15.
And so on. In the example shown in FIG. 5, a polarization beam splitter 23 and a spectral condensing element 24 shown in a liquid crystal projector described later are also shown.

FIGS. 6 and 7 show a fourth embodiment of the present invention.
It will be described based on. This embodiment corresponds to the invention described in claim 5, and FIG. 6 shows a configuration example of the liquid crystal projector.
FIG. 7 is a schematic diagram of a light condensing system / projection system in which the optical axis is extended linearly. This liquid crystal projector is an example using an illuminating device A3 as shown in FIG.
2, a total reflection mirror 20 is interposed between the lens arrays 7 and 11), a total reflection prism 21, and a connecting prism 2
2, polarization beam splitter 23, spectral condensing element 24, 3,
It comprises a plurality of reflective liquid crystal panels 1R, 1G, 1B, and a condenser lens 25 for each reflective liquid crystal panel 1R, 1G, 1B. In the lighting device A3, 26 is a lamp house, and 27 is a cooling fan.

The polarizing beam splitter 23 is connected to the illumination device A
The S-polarized light emitted from 3 is reflected 90 degrees toward the spectral light condensing element 24 side. Spectral focusing element 2
4 is a dichroic prism 28 in the present embodiment.
Is used. This dichroic prism 28
Is a pair of prisms 29 provided with a red layer 29r having a property of reflecting only long-wavelength light of red R or more and a blue layer 29b having a property of reflecting only short-wavelength light of blue B or less. This is a cubic optical element that is configured by joining these four prisms 29 and 30 in a state in which a pair of normal prisms 30 are arranged in a left-right symmetric position. Therefore, one spectral condensing element 2
When viewed as 4, the dichroic prism 28 has
Red layer 2 parallel to the reflection surface of polarization beam splitter 23
9r and a blue layer 29b orthogonal to the red layer 29r are formed. The red layer 29r and the blue layer 29b are formed as non-metal multilayer films.

Three reflective liquid crystal panels 1R, 1G, 1B
Are arranged corresponding to the red layer 29r and the blue layer 29b of the dichroic prism 28. That is, the reflection type liquid crystal panel 1R is disposed in the reflection direction of the longer wavelength than the red R reflected by the red layer 29r, and the blue layer 29r is disposed.
The reflection type liquid crystal panel 1B is disposed in the direction of reflection of blue light of B or shorter, which is reflected by b, and the reflection type liquid crystal panel 1G is disposed in the transmission direction of the red layer 29r and the blue layer 29b. These reflective liquid crystal panels 1R, 1G, 1
B is an image (not shown) in which an image for each color to be projected by the information display system is formed by on / off control of each liquid crystal element.

Further, a projection lens system 33 having a projection lens 32 is provided on the optical axis between the polarization beam splitter 23 and the screen 31. Here, as shown in FIG. 7, the virtual light source surface 11 (the position of the polarization conversion element 15)
And the optical path length from each of the reflective liquid crystal panels 1R, 1G, 1B and the optical path length from each of the reflective liquid crystal panels 1R, 1G, 1B to the projection lens 32 are all set to be equal.

In such a configuration, the light beam from the illuminating device A3 that has been adjusted to only the S-polarized light component is reflected by the total reflection prism 21 and the polarization beam splitter 23 and enters the spectral light condensing element 24. Here, the light is split into red R, green G, and blue B according to the wavelength, and enters the corresponding reflective liquid crystal panels 1R, 1G, and 1B. Here, each of the reflective liquid crystal panels 1R, 1G, and 1B is turned on / off in accordance with an image signal input to the liquid crystal projector by the information display system. When the liquid crystal panel is off, the S-polarized component is reflected as the S-polarized component. The s-polarized light component is converted into a p-polarized light component and reflected. Then, the reflected light from each of the reflective liquid crystal panels 1R, 1G, and 1B composed of the S-polarized light component or the P-polarized light component is collected and combined in the dichroic prism 28, and returns to the polarization beam splitter 23. At this time, only the P-polarized light component reflected from the liquid crystal element corresponding portions turned on in each of the reflective liquid crystal panels 1R, 1G, and 1B passes through the polarizing beam splitter 23. 31 is enlarged and projected. As a result, an image corresponding to the image signal input to the liquid crystal projector is projected on the screen 31 as a color image.

Here, in the present embodiment, since the illumination device A3 as described above is used, the utilization efficiency of the luminous flux is high, so that a good projected image can be obtained. Further, the spread of the secondary light source image 8, which forms a virtual light source for irradiating the liquid crystal panels 1R, 1G, 1B, can be reduced, and this is an effective configuration for reducing the aperture of the projection lens 32.

In the present embodiment, the example using the lighting device A3 illustrated in FIG. 5 has been described. However, the present invention is not limited to this, and may be any of the above-described lighting devices.

Further, as shown in FIG. 8, the present invention can be similarly applied to a liquid crystal projector of a type using transmissive liquid crystal panels 1R ', 1G', and 1B '. In the case of FIG. 8, the luminous flux from the illuminating device A3 whose polarization direction is aligned is reflected by the blue spectral mirror 41, and the wavelength light of blue B or less reflected by the total reflection mirror 42 is transmitted through the transmissive liquid crystal panel. 1
B ′ is guided to B ′, transmitted through the blue spectral mirror 41, and reflected by the green spectral mirror 43.
Light having the following wavelengths is guided to the transmissive liquid crystal panel 1G ', passes through the green spectral mirror 43, and is reflected by the relay lens 44, the total reflection mirror 45, the relay lens 46, and the total reflection mirror 47 while correcting the optical path length. It is set such that light having a wavelength of red R or more is guided to the transmission type liquid crystal panel 1R '. In the present embodiment, each transmissive liquid crystal panel 1
A microlens array 48 is used instead of the condenser lens 25 for R ', 1G', and 1B ', and a light combining prism 49 is used instead of the spectral condensing element 24. The microlens array 48 is formed in a matrix for each liquid crystal element in order to increase the light use efficiency for each liquid crystal element in the liquid crystal panel.

[0039]

According to the illumination device of the first aspect of the present invention, the reflecting mirror in the light source device is a spheroidal mirror, a light emitting source is disposed near the first focal point, and the second focal point is located near the projection target. By setting, the use efficiency of the light emitted from the light emitting source can be improved, and a lens array of a so-called integrator optical system is arranged in the light beam focused by the second focus. In particular, it is possible to minimize the spread of a secondary light source image forming a virtual light source for irradiating the projection target without using a separate condenser lens or the like, and to reduce the spatial distance from the light emitting source to the projection target. In a short state, the configuration is effective for reducing the diameter of the projection lens.

According to the lighting device of the second aspect of the present invention,
The reflecting mirror in the light source device is a spheroidal mirror.
By arranging a light emitting source near the focal point and setting a second focal point near the projection target, it is possible to increase the use efficiency of light emitted from the light emitting source, and to narrow down by being converged toward the second focal point. By arranging a so-called integrator optical system lens array in the light beam, the spread of the secondary light source image which forms a virtual light source for irradiating the projection target without using a separate condenser lens or the like is minimized. This is an effective configuration for reducing the aperture of the projection lens in a state where the spatial distance from the light emitting source to the projection target is short.

According to the illumination device of the third aspect of the present invention,
The reflecting mirror in the light source device is a spheroidal mirror.
By arranging a light emitting source near the focal point and setting a second focal point near the projection target, it is possible to increase the use efficiency of light emitted from the light emitting source, and to narrow down by being converged toward the second focal point. By disposing the first lens array of the so-called integrator optical system in the light beam to be spread, the secondary light source image forming a virtual light source for irradiating the projection target without using a separate condensing lens or the like. Is reduced as much as possible, and this is an effective configuration for reducing the aperture of the projection lens in a state where the spatial distance from the light emitting source to the projection target is short. In particular, since the second lens having a diverging effect, such as a concave lens, is used, the spread of the secondary light source image forming a virtual light source for irradiating the projection target can be further reduced, and the projection lens This is a more effective configuration for reducing the diameter.

According to the fourth aspect of the present invention, since a conversion element is provided to emit light with one of the polarization components being aligned, the utilization efficiency of the light from the light source can be increased, and at this time, the second lens Thus, the light beam that has been converted into a substantially parallel light beam is made incident on the polarization conversion element to make the polarization directions uniform, so that the efficiency of the polarization conversion can be improved.

According to the liquid crystal projector of the fifth aspect of the present invention, since the liquid crystal panel is illuminated by using the illuminating device according to any one of the first to fourth aspects, the illumination having a high light use efficiency as a whole. The liquid crystal panel can be illuminated underneath and projected on a screen by a projection lens system having a small aperture, and the overall size of the liquid crystal projector can be reduced.

[Brief description of the drawings]

FIG. 1 is an optical system configuration diagram showing a lighting device according to a first embodiment of the present invention.

FIG. 2 is an optical system configuration diagram showing a lighting device according to a second embodiment of the present invention.

FIG. 3 is an optical system configuration diagram showing a lighting device according to a third embodiment of the present invention.

FIG. 4 is an enlarged configuration diagram showing the polarization conversion element.

FIG. 5 is an optical system configuration diagram showing a lighting device of a specific modified example.

FIG. 6 is an optical system configuration diagram showing a liquid crystal projector according to a fifth embodiment of the present invention.

FIG. 7 is a schematic diagram of a condensing system / projection system in which the optical axis is extended linearly.

FIG. 8 is an optical system configuration diagram showing a modified example thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Projection object, liquid crystal panel 3 Light emission source 4 Spheroid mirror 6 Lens element, 1st lens element 7 Lens array, 1st lens array 8 Secondary light source image 11 2nd lens array 12 2nd lens element 14 Second lens 15 Polarization conversion element 33 Projection lens system A1, A2, A3 Illumination device F1 First focus F2 Second focus

Claims (5)

[Claims] A luminous source; a spheroidal mirror having the luminous source disposed near a first focal point and having a second focal point set near a rectangular projection object; A plurality of rectangular lens elements arranged between a point and the second focal point and formed in a rectangular shape substantially similar to the shape of the projection target are two-dimensionally arranged and emitted from the light emitting source. A plurality of secondary light source images that are divided from the received light, and each of the divided secondary light source images is superimposed on the projection target and projected. 2. A light-emitting source; a spheroidal mirror having the light-emitting source disposed near a first focal point and having a second focal point set near a rectangular projection object; A first lens element, which is disposed between a point and the second focal point and has a plurality of first lens elements formed in a rectangular shape substantially similar to the shape of the projection target and arranged in a two-dimensional manner; And a plurality of second lens elements, each of which is arranged at a focal position of the first lens element and corresponding to the first lens element, are arranged two-dimensionally, and each of the second lens elements has a second lens element. A second lens array for projecting a light beam transmitted through a lens element while superimposing the light beam on the projection target. 3. A light-emitting source; a spheroidal mirror having the light-emitting source disposed near a first focal point and having a second focal point set near a rectangular projection object; A first lens element, which is disposed between a point and the second focal point and has a plurality of first lens elements formed in a rectangular shape substantially similar to the shape of the projection target and arranged in a two-dimensional manner; A second lens array disposed at a focal position of the first lens element, and a plurality of second lens elements respectively corresponding to the first lens element are two-dimensionally arranged. A second lens that exhibits a diverging effect on the light transmitted through the second lens array, and projects a light beam transmitted through the first and second lens elements so as to be superimposed on the projection target; A lighting device comprising: 4. The second lens has a function of converting a main light beam converged by the spheroidal mirror toward the second focal point into a substantially parallel light beam. 4. The illumination device according to claim 3, further comprising a polarization conversion element that emits a light beam having a random direction in a manner that only one of the P-polarized component and the S-polarized component is emitted. 5. The lighting device according to claim 1, wherein at least one liquid crystal panel on which an image to be projected is formed by the information display system, and the liquid crystal panel is illuminated as a projection target. And a projection lens system for projecting the image of the liquid crystal panel on a screen.