JPH08211329A - Lighting device and projection display device using it - Google Patents

Abstract

PURPOSE: To provide a high definition and bright lighting device improved in transmission efficiency of light in a lighting optical system of using an integrator by using a reflection type optical element without accompanying the occurrence of various aberrations so as to constitute an integrator optical system. CONSTITUTION: A condenser lens plate 60 consisting of plural minute lenses corresponding to the number of secondary light source images to be formed is arranged on the position where the secondary light source images are formed. Respective secondary light source images are image formed in the lens pupil of the corresponding minute lenses, and image surfaces cut out by minute condenser mirrors of a first condenser mirror plate 40 and a second condenser mirror plate 50 are superimposed and image formed on a position by the condenser lens plate 60. Thus, a lighting area 70 is lighted accompanied with a uniform intensity distribution. At this time, since the integrator optical system is constituted of using the reflection type optical element without being accompanied with the occurrence of various aberrations, various evil effects caused by the aberrations are reduced even when the minute condenser mirrors with a short focal distance are used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illuminating device for uniformly illuminating a specific rectangular area and the like, and a projection type device for enlarging and displaying an image on a screen by modulating light emitted from the illuminating device with a light valve. The present invention relates to a display device.

[0002]

2. Description of the Related Art One of the problems to be solved by a liquid crystal projector for projecting and displaying an image of a liquid crystal light valve is effective use of light from a light source, that is, improvement of light use efficiency. An integrator optical system has been proposed as one of the measures for improving the light utilization efficiency. This configuration is disclosed in JP-A-3-111806.
The contents of the publication are described in detail.

The integrator optical system is, in principle, the same as that used in an exposure machine, in which a light beam from a light source is divided by a plurality of rectangular lenses (hereinafter referred to as a first lens plate), An image (light source image) cut out by a rectangular lens is superimposed and imaged on one illumination region by a lens system (hereinafter referred to as a second lens plate) corresponding to each rectangular lens. In this optical system, most of the light flux traveling from the light source to the liquid crystal light valve can be guided to the liquid crystal light valve, so that the illumination efficiency is improved and the intensity distribution of the light illuminating the liquid crystal light valve is made substantially uniform. There is a feature that you can do things.

[0004]

The image cut out by the first lens plate is transmitted to the illumination area by the second lens plate. Improving the transmission efficiency of this portion improves the efficiency of the integrator optical system. Leads to. For that purpose, it is necessary to form the first lens plate by a rectangular lens having a large lens power.

However, as the lens power is increased,
The influence of the aberration peculiar to the lens cannot be ignored. As a result, for example, the transmission efficiency of the light source light shows a large wavelength dependency, and there is an adverse effect that the spectral distribution of the illumination light changes. Therefore, as long as the integrator optical system is composed of only lens optical elements, the efficiency of the entire optical system cannot be increased so much. In order to prevent the above adverse effects, it is desirable to configure the integrator optical system using reflective optical elements that do not cause various aberrations.

Therefore, the present invention solves such a problem, and an object of the present invention is to provide a high-quality and bright illuminating device which improves the light transmission efficiency in an illuminating optical system using an integrator. It is to be realized.

Another object of the present invention is to realize a projection display device capable of forming a bright projected image by improving the light utilization efficiency by using such an illuminating device.

[0008]

In order to solve the above-mentioned problems, in a lighting device according to the present invention, a light source section for emitting a substantially parallel light beam and a polarization separation film formed of a dielectric multilayer film are provided as two right-angle prisms. And a polarization splitting unit that splits the light flux emitted from the light source unit into two types of polarized light of P-polarized light and S-polarized light whose polarization directions are orthogonal to each other, and outputs the polarized light. And a first condensing mirror plate for condensing the P-polarized light emitted from the polarization separation unit to form a plurality of secondary light source images, and A second condensing mirror plate for forming the plurality of secondary light source images by condensing the S-polarized light emitted from the polarization separation unit, which has the same size and shape as those of the condensing mirror plate.
Between the first condenser mirror plate and the polarization splitting section, and the second
Firstly placed between the condenser mirror plate of the
.Lamda. / 4 retardation plate, a second .lamda. / 4 retardation plate, and a plurality of secondary light source images formed by the first condensing mirror plate and the second condensing mirror plate. It is placed in the vicinity of the position and is composed of the same number of micro lenses as the micro condensing mirrors forming the first or second condensing mirror plate, and cut by the first condensing mirror plate and the second condensing mirror plate. It is characterized in that a condensing lens plate for superimposing the formed image plane on the illumination area is formed.

In the present invention, it is preferable that the minute lens forming the condenser lens plate is similar to the minute condenser mirror.

Further, in the present invention, the polarized light separating section is
It is preferable that the condenser lens plate and the first condenser mirror plate, and the condenser lens plate and the second condenser mirror plate are integrated.

In the present invention, the polarization separation section may be composed of a flat plate-shaped polarization separation plate.

Further, in the present invention, the right-angle prism forming the polarization splitting portion may be a liquid-filled prism.

Further, in the present invention, the λ / 4 retardation plate may be formed of TN (twisted nematic) liquid crystal.

In the projection type display device according to the present invention using the illuminating device constructed as described above, the light source part for emitting a substantially parallel light beam and the polarization separation film made of a dielectric multilayer film are sandwiched by two right-angle prisms. And a polarization splitting unit that splits the light flux emitted from the light source unit into two types of polarized light of P-polarized light and S-polarized light whose polarization directions are orthogonal to each other and emits the polarized light.
A first condenser mirror plate configured by a plurality of minute condenser mirrors having a rectangular outer shape, condensing the P-polarized light emitted from the polarization separation unit, and forming a plurality of secondary light source images. A second condensing mirror plate which has the same size and shape as the first condensing mirror plate and condenses the S-polarized light emitted from the polarization splitting unit to form a plurality of secondary light source images. , A first λ / 4 disposed between the first light collecting mirror plate and the polarization splitting portion, and between the second light collecting mirror plate and the polarization splitting portion.
In the vicinity of a position where a plurality of secondary light source images formed by the phase difference plate, the second λ / 4 phase difference plate, and the first light collecting mirror plate and the second light collecting mirror plate are formed. An image plane that is placed and is composed of the same number of minute lenses as the minute condenser mirrors that compose the first or second condenser mirror plate, and is cut off by the first condenser mirror plate and the second condenser mirror plate. On the illumination area, and a color separation means for separating the light passing through the condenser lens plate into each color light of the three primary colors, and each color light is modulated based on a video signal from the outside. Three light valves, and color combining means for combining the modulated lights of the respective color lights modulated by the light valves,
It is characterized in that a light projecting means for projecting the respective color lights synthesized by the color synthesizing means on the screen is provided.

Here, it is preferable that the color synthesizing means has a dichroic prism, and a light guiding means is provided in an optical path having the longest optical path length among the optical paths of the respective color lights from the color separating means to the respective light valves. .

[0016]

EXAMPLES The present invention will be described in detail below based on examples. However, the present invention is not limited to the following examples.

(Embodiment 1) FIG. 1 is a schematic configuration diagram of a main part of the illuminating device of this embodiment as seen in a plan view.

In FIG. 1, the illuminating device 10A of this example is
The light source unit 20, the polarization splitting unit 30, the first condensing mirror plate 40, the first λ / 4 phase difference plate 33, and the second condensing unit along the system optical axis L (L ′) that bends at a right angle. Mirror plate 50, second λ / 4 phase difference plate 34, and condenser lens plate 6
A light beam having a value of 0 and emitted from the light source unit 20 is separated into two light beams by the polarization splitting unit 30 due to the difference in the polarization direction, and then the first light collecting mirror plate 40 and the second light collecting mirror plate 40. After passing through 50, they are combined again into one light beam by the polarization splitting unit 30, and are made to reach the rectangular illumination region 70 by the condenser lens plate 60.

The light source unit 20 is generally composed of a light source lamp 21 and a parabolic reflector 22, and the light emitted from the light source lamp 21 is reflected in one direction by the parabolic reflector 22 and is substantially parallel. The light beam becomes a light beam and is incident on the polarization separation unit 30. Here, parabolic reflector 2
Instead of 2, an ellipsoidal reflector, a spherical reflector or the like can be used.

The polarization separating section 30 is a general rectangular column-shaped polarization beam splitter, that is, a polarization separating film 31 made of a dielectric multilayer film is sandwiched between two glass right-angle prisms (triangular prisms) 32. It has a structure. At this time, the polarization separation film 31 is formed so as to form an angle α = 45 degrees with respect to the incident surface 301 of the polarization separation unit 30. However, α is not limited to 45 degrees and may be set according to the incident angle of the incident light beam from the light source unit 20.

A first λ / 4 phase difference plate 33 is provided on the first exit surface 302 of the polarization splitting section 30, and a second exit surface 303 is provided.
A second λ / 4 retardation plate 34 is formed on each of the first and second condensing mirror plates 40 and the second condensing mirror plate 40 so as to face the center of the polarization splitting portion 30 on the outside of these retardation plates. Optical mirror plate 5
0 is installed in a direction perpendicular to the system optical axis L ′ (L). As shown in FIG. 2, an external view of each of these condenser mirror plates is formed by arranging a plurality of identical minute condenser mirrors 41 each having a rectangular outer shape in a matrix. In this example, Reflection surface 42 of minute condenser mirror 41
Has a paraboloidal shape. However, the curvature shape of the reflecting surface 42 may be spherical, elliptical, or toric, and these may be set according to the incident angle of the incident light beam from the light source unit 20.

On the illumination area 70 side of the third emission surface 304 of the polarization splitting unit 30, a condenser lens plate 60 is provided, and a first condenser mirror plate 40 and a second condenser mirror plate 40 are formed through a process described later. It is installed at a position where a secondary light source image is formed by 50 in a direction perpendicular to the system optical axis L. The condensing lens plate 60 is a compound lens body composed of rectangular microlenses 61 as shown in FIG. 3, and the number of microlenses forming the condensing lens plate 60 is the first and the second. Minute condensing mirror 4 constituting the condensing mirror plate (40 and 50) of
Equal to the number of ones. In the case of this example, the plurality of minute lenses 6
A decentering lens is used for part of 1.

In the illuminating device 10A constructed as described above, as shown in FIG. 1, the light source section 20 radiates randomly polarized light and makes it enter the polarization separation section 30.
The random polarized light incident on the polarization splitting section 30 can be considered as a mixed light of P-polarized light and S-polarized light, and the mixed light is converted into P-polarized light by the polarization splitting film 31 in the polarization splitting section 30. It is separated into two types of S-polarized light. That is, the P-polarized light included in the randomly polarized light passes through the polarization separation film 31 as it is, and the first emission surface 30.
On the other hand, the S-polarized light is reflected by the polarization separation film 31 and changes its traveling direction to the second emission surface 303 of the polarization separation unit 30.

The two kinds of polarized light separated by the polarization separation unit 30 pass through the λ / 4 phase difference plate, are reflected by the condenser mirror plate, and are polarized while passing through the λ / 4 phase difference plate again. When the direction of light is reversed by 180 degrees, the plane of polarization is
Rotate 0 degrees. The change of the polarized light will be described with reference to FIG. In FIG. 4, the first or second light collecting mirror plate (40 or 50) is shown as a planar mirror plate 332 for the sake of simplification of description. λ / 4 retardation plate 331
The P-polarized light 333 incident on is converted into clockwise circularly polarized light 335 by the λ / 4 retardation plate and reaches the mirror plate 332. The light is reflected by the mirror plate 332, but at the same time, the rotation direction of the plane of polarization also changes. That is, the clockwise polarized light 335 changes to the counterclockwise polarized light 336 (the counterclockwise polarized light changes to the clockwise polarized light). The polarized light whose light traveling direction has been inverted 180 degrees by the mirror plate 332 and at the same time has become the counterclockwise circularly polarized light 336 is again converted into the λ / 4 phase difference plate 3.
When passing through 31, it is converted into S-polarized light 334. In addition, the S-polarized light is converted into P-polarized light through the same process.

Therefore, the P-polarized light reaching the first exit surface 302 is inverted by 180 degrees in the traveling direction of the polarized light by the first λ / 4 retardation plate 33 and the first condenser mirror plate 40. At the same time, the light is converted into S-polarized light, reflected by the polarization separation film 31, changes its traveling direction, and travels toward the third emission surface 304. On the other hand, the S-polarized light that has reached the second emission surface 303 has its traveling direction inverted by 180 degrees by the second λ / 4 phase difference plate 34 and the second condensing mirror plate 50, and at the same time P
It is converted into polarized light, and this time, it passes through the polarization separation film 31 as it is, and goes to the third emission surface 304. That is, at this time, the polarization separation film 31 also functions as a polarization combining film.

Since the first light collecting mirror plate 40 and the second light collecting mirror plate 50 are composed of the minute light collecting mirrors 41 having a light collecting function, the traveling direction of the polarized light is substantially reversed, and at the same time, A plurality of secondary light source images (condensed images) are formed in the same number as the minute condenser mirrors forming each condenser mirror plate.

At the position where the secondary light source image is formed, a plurality of minute lenses 61 corresponding to the number of secondary light source images formed.
Are arranged, and the respective secondary light source images are formed in the lens pupils of the corresponding minute lenses 61, and the first light collecting mirror plate 40 and the second light collecting mirror plate are formed. The image plane cut out by the 50 minute condenser mirrors 41 is superposed and imaged at one place by the condenser lens plate 60. As a result, the illuminated area 70 is illuminated with a substantially uniform intensity distribution.

In the present invention, the optical element corresponding to the first lens plate of the conventional integrator optical system is composed of the reflection-type optical element which does not cause various aberrations. Even if you use a short micro condenser mirror,
Various adverse effects caused by the aberration are small. In particular, since almost no chromatic aberration occurs in the reflection type optical element, the light flux collected by the condenser lens plate can be accurately guided to the lens pupil of the minute lens, so that the light transmission efficiency is high. Therefore,
The efficiency of the illumination system is high, and a high-quality and bright illumination device can be realized.

Further, an illumination area 7 having a horizontally long rectangular shape.
The first condenser mirror plate 40 and the second condenser mirror plate 40
Since the minute condensing mirrors 41 forming the condensing mirror plate 50 have a horizontally long rectangular shape, even when the illumination area 70 having the horizontally long rectangular shape is formed, the illumination efficiency is improved without wasting the light amount. be able to.

(Second Embodiment) In the first embodiment, the polarization splitting unit 30, the first condenser mirror plate 40, the second condenser mirror plate 50, and the condenser lens plate 60 are separated. However, they can be integrated.

That is, the lighting device 10B according to the second embodiment shown in FIG. 5 may be configured. This lighting device,
In addition, in each of the embodiments described below, the basic configuration is the same as that of the lighting device according to the first embodiment, and therefore, portions having the same functions are denoted by the same reference numerals, and description thereof will be omitted.

The illumination device 10B shown in FIG. 5 uses a condenser mirror plate 72 whose appearance is shown in FIG.
That is, the light incident surface 721 is a flat surface, and the reflection surface 723 is formed on the back surface of the glass block 722.
With such a shape, as shown in FIG. 5, the polarization splitting unit 30, the first condensing mirror plate 40, the first λ / 4 phase difference plate 33, and the second condensing mirror plate 50 are provided. , The second λ / 4 phase difference plate 34 and the condenser lens plate 60 can be integrated, and the optical system can be made smaller, and the reflection loss of light at the interface can be reduced.

(Embodiment 3) In the illumination device 10C shown in FIG. 7, the main optical systems are arranged in the illumination device 10 of the first embodiment.
It is the same as A, but is characterized in that the polarization splitting section 30 is a flat plate-shaped structure. That is, the polarization separation film 3
1 is arranged so as to form an angle of γ = 45 degrees with respect to the system optical axis L ′, so that the polarization separation section 30 mainly composed of two right-angle prisms shown in FIG. It has almost the same function as. This allows
It is possible to reduce the cost and the weight of the polarization splitting unit 30.

(Embodiment 4) In the illumination device 10D shown in FIG. 8, the main optical systems are arranged in the illumination device 10 of the first embodiment.
The same as A, but the prism structure 30G is configured by the six transparent plates 73 that form the wall surface, and the flat plate-shaped polarization separation plate 74 in which the polarization separation film 31 is formed is arranged. The structure is characterized in that the structure formed by filling the liquid 75 is used as the polarization separation section 30. This makes it possible to reduce the cost and the weight of the polarization splitting unit 30.

(Embodiment 5) The projection type display device (liquid crystal projector) of this embodiment is one in which the brightness of the image is improved by using the illumination device of the previous embodiment 1, of which FIG. FIG. 2 is a schematic configuration diagram of a projection display device using the illumination device shown in FIG.

In FIG. 9, the projection type display device 80 of this example is shown.
In 0, the illumination device 10A is incorporated, that is,
The substantially parallel light flux emitted from the light source unit 20 is polarized by the polarization splitting unit 3
At 0, the first light collecting mirror plate 40 and the second light collecting mirror plate 5 are separated into two light beams due to the difference in the polarization direction.
After passing through 0, they are combined again into one light beam by the polarization splitting unit 30,
The condenser lens plate 60 illuminates a rectangular illumination area with light having a substantially uniform intensity.

In the light flux emitted from the illuminating device 10A, first, red light is transmitted and blue light and green light are reflected by the blue-green reflective dichroic mirror 801. The red light is reflected by the reflection mirror 802 and reaches the first liquid crystal light valve 803. On the other hand, of the blue light and the green light, the green light is reflected by the green reflective dichroic mirror 804 and reaches the second liquid crystal light valve 805.

Here, since blue light has the longest optical path length of each color light, the incident side lens 806, the relay lens 808, and the emission side lens 81 are used for blue light.
A light guide unit 850 constituted by a relay lens system of 0 is provided. That is, the blue light is first transmitted through the green reflective dichroic mirror 804, and then, first, the emission side lens 8
06 and the reflection mirror 807, and then the relay lens 8
08, after being focused by the relay lens 808, it is guided by the reflection mirror 809 to the emission side lens 810, and then reaches the third liquid crystal light valve 811. Here, the first and third liquid crystal light valves 80
Reference numerals 3, 805 and 811 modulate respective color lights to include image information corresponding to the respective colors, and then the modulated color lights are incident on the dichroic prism 813 (color combining means).
The dichroic prism 813 has a red-reflecting dielectric multilayer film and a blue-reflecting dielectric multilayer film in a cross shape, and synthesizes the respective modulated light beams. The light fluxes combined here pass through the projection lens 814 (projection means) and form an image on the screen 815.

The projection type display device 800 having the above-mentioned configuration
Then, according to the shape of the liquid crystal light valve, the luminous flux from the light source section is subdivided by the minute condenser mirrors, and these subdivided luminous fluxes are superposed and combined on the liquid crystal light valve, so that the illumination light included in the light source section is combined. Since the nonuniformity (for example, the nonuniformity of the illumination intensity and the nonuniformity of the spectral distribution) is averaged, it is possible to irradiate the liquid crystal light valve with extremely uniform illumination light.

Further, in the present invention, since the reflection type mirror which does not cause various aberrations is used as the optical element for condensing, even if the focal length is shortened to improve the condensing efficiency, the chromatic aberration is reduced. It is possible to maintain the transmission efficiency of illumination light at a high level without generation of light, and it is possible to realize a high-quality and bright projection image.

Further, the minute condenser mirror 4 constituting the first condenser mirror plate 40 and the second condenser mirror plate 50 is formed in accordance with the shape of the liquid crystal light valve having a horizontally long rectangular shape.
Since 1 is a horizontally long rectangular shape, the light amount is not wasted and the illumination efficiency can be improved. Therefore,
The illuminating device 10A is suitable as an illuminating device for a projection type display device equipped with a horizontally long liquid crystal light valve that is easy to see and can project a powerful image.

In addition, in this example, as the color synthesizing means,
Since the dichroic prism 813 is used, the size can be reduced and the liquid crystal light valves 803, 80 can be used.
Since the optical path length between the projection lenses 5 and 811 and the projection lens 814 is short, a bright projected image can be realized even if a projection lens having a relatively small aperture is used. Further, each color light has a different optical path length only in one of the three optical paths, but in this example,
For the blue light having the longest optical path length, the incident side lens 80
Since there is provided the light guide means 850 constituted by the relay lens system including the relay lens system 806, the relay lens 808, and the exit side lens 810, color difference or the like does not occur.

(Sixth Embodiment) As a projection type display device, as shown in FIG. 10, a color synthesizing means may be constituted by a mirror optical system. When a mirror optical system is used as the color synthesizing means, liquid crystal light valves 803, 805, 8 at three locations are used.
Since the optical path lengths of 11 and the light source unit 20 are equal, there is a feature that effective illumination with little brightness unevenness and color unevenness can be performed without using a special light guide means.

That is, in FIG. 10, the projection display device 900 of this example uses the illuminating device 10B shown in FIG. 2, that is, the substantially parallel luminous flux emitted from the light source section 20 is a polarization separation section. After being separated into two light beams due to the difference in the polarization direction at 30, the first condensing mirror plate 40
After passing through the second condensing mirror plate 50 and the polarization separation unit 30, the light beams are combined again into one light beam, and the condensing lens plate 60 illuminates the rectangular illumination area with light of substantially uniform intensity. .

The luminous flux emitted from the illuminating device 10B is such that the red light is first reflected by the red reflection dichroic mirror 901 and the blue light and the green light are transmitted. Here, the red light is reflected by the reflection mirror 902.
Is reflected by the first liquid crystal light valve 803 and reaches the first liquid crystal light valve 803.
On the other hand, of the blue light and the green light, the green light is reflected by the green reflective dichroic mirror 903 and reaches the second liquid crystal light valve 805. The blue light reaches the third liquid crystal light valve 811 after passing through the green reflective dichroic mirror 903. After that, the first and third liquid crystal light valves 803, 805, and 811 modulate the respective colored lights, include the image information corresponding to each color, and then emit the modulated colored lights. Here, the intensity-modulated red light passes through the green reflective dichroic mirror 904 and the blue reflective dichroic mirror 905 and reaches the projection lens 814 (projection unit). The intensity-modulated green light is reflected by the green reflective dichroic mirror 904, then passes through the blue reflective dichroic mirror 905, and reaches the projection lens 814. The intensity-modulated green light is reflected by the green reflective dichroic mirror 904, and then transmitted through the blue reflective dichroic mirror 905,
Reach the projection lens 814. The intensity-modulated blue light is
After being reflected by the blue reflection dichroic mirror 905, it reaches the projection lens 814.

As described above, also in the projection display apparatus 900 in which the color synthesizing means is constituted by the mirror optical system including the dichroic mirror, the illumination light is emitted as in the case of the projection display apparatus 800 described in the fifth embodiment. It is possible to maintain high transmission efficiency and to realize high-quality and bright projected images.

(Other Examples) In each of the above examples, a λ / 4 retardation plate made of a general polymer film is used, but those retardation plates are twisted nematic. You may comprise using a liquid crystal (TN liquid crystal). When the TN liquid crystal is used, the wavelength dependence of the retardation plate can be reduced, so that the polarization conversion performance of the λ / 4 retardation plate can be improved as compared with the case where a general polymer film is used. is there.

[0048]

As described above, in the illuminating device according to the present invention, the optical element corresponding to the first lens plate of the conventional integrator optical system is the reflection type optical element which does not cause various aberrations. Therefore, even if the optical arrangement has a short focal length in order to enhance the light collection efficiency, various adverse effects caused by the aberration are small, and high light transmission efficiency can be obtained. Therefore, it is possible to realize a high-quality and bright illumination device with high efficiency as an illumination system.

Further, in the projection type display device constructed by using the illuminating device of the present invention, since uniform and high-brightness illumination light can be efficiently supplied to the liquid crystal light valve, utilization of light in the entire projection type display device is possible. The efficiency is improved, and it is possible to obtain a high-quality and bright projected image. Further, the improvement of the light use efficiency brings about a reduction in the amount of heat generated in the projection type display device, and as a side effect, the cooling device can be downsized and the noise can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic plan view showing the configuration of a lighting device according to a first embodiment of the invention.

FIG. 2 is an external view showing the configuration of a condenser mirror plate used in the lighting device shown in Embodiment 1.

FIG. 3 is an external view illustrating a configuration of a condenser lens plate used in the lighting device according to the first embodiment.

FIG. 4 is a diagram for explaining a rotation process of a polarization plane by a λ / 4 retardation plate and a condenser mirror plate.

FIG. 5 is a schematic plan view showing the configuration of a lighting device according to a second embodiment of the invention.

FIG. 6 is an external view illustrating a configuration of a condenser lens plate used in the lighting device according to the second embodiment.

FIG. 7 is a schematic plan view showing the configuration of a lighting device according to a third embodiment of the invention.

FIG. 8 is a schematic plan view showing the configuration of an illumination device according to a fourth embodiment of the present invention.

FIG. 9 is a schematic plan view showing the configuration of a projection display device according to a fifth embodiment of the invention.

FIG. 10 is a schematic plan view showing the configuration of a projection display apparatus according to Embodiment 6 of the present invention.

[Explanation of symbols]

10A to 10D ... Illumination device 20 ... Light source 21 ... Light source lamp 22 ... Parabolic reflector 30 ... Polarization splitting unit 30G ... Prism structure 301 ... Incident surface 302 ... First output surface 303 ... Second output surface 304 ... Third output surface 31 ... Polarization separation film 32 ... Right angle prism 33 ... First λ / 4 phase difference plate 331 ... λ / 4 phase difference plate 332 ... Mirror plate 333 ... P-polarized light 334 ... S-polarized light 335 ... Clockwise circularly polarized light 336 ... Counterclockwise circularly polarized light 34 ... 2nd (lambda) / 4 phase difference plate 40 ... 1st condensing mirror plate 41 ... Micro condensing mirror 42 ... Reflecting surface 50 ... 2nd condensing mirror plate 60・ ・ ・ Condensing lens plate 61 ・ ・ ・ Micro lens 70 ・ ・ ・ Illumination area 72 ・ ・ ・ Condensing mirror plate 7 21 ... Incident surface 722 ... Glass block 723 ... Reflection surface 73 ... Transparent plate 74 ... Polarization separation plate 75 ... Liquid 800 ... Projection display device (dichroic prism type) 801 ... Blue-green reflective dichroic mirror 802 ... Reflective mirror 803 ... First liquid crystal light valve 804 ... Green reflective dichroic mirror 805 ... Second liquid crystal light valve 806 ... Incident side lens 807, 809 ... Reflecting mirror 808 ... Relay lens 810 ... Emitting side lens 811 ... Third liquid crystal light valve 813 ... Dichroic prism 814 ... Projection lens 815 ... Screen 850. ..Light guide means 900 ... Projection display device (mirror optical system) 901 ... Red reflection dichroic Ra 902 ... Reflective mirror 903, 904 ... Green reflective dichroic mirror 905 ... Blue reflective dichroic mirror

Claims (8)

[Claims] 1. A structure in which a light source section for emitting a substantially parallel light beam and a polarization separation film made of a dielectric multilayer film are sandwiched by two right-angle prisms, and the light beams emitted from the light source section are polarized in mutually different directions. 2 of orthogonal P-polarized light and S-polarized light
It is composed of a polarized light splitting unit that splits and outputs the polarized light of different types, and a plurality of minute light collecting mirrors having a rectangular outer shape. A first condensing mirror plate for forming a secondary light source image, having the same size and shape as the first condensing mirror plate, condensing the S-polarized light emitted from the polarization splitting unit, and Of 2
A second light collecting mirror plate for forming a secondary light source image; a space between the first light collecting mirror plate and the polarization separation unit; and a second light collection mirror plate and the polarization separation unit. And a first λ / 4 retardation plate and a second λ /
4 phase difference plate, and is placed in the vicinity of a position where a plurality of secondary light source images formed by the first light collecting mirror plate and the second light collecting mirror plate are formed, and the first or second Of the same number of minute lenses as the number of minute condenser mirrors constituting the second condenser mirror plate, and the image plane cut out by the first condenser mirror plate and the second condenser mirror plate is superimposed on the illumination area. An illuminating device comprising: a condenser lens plate for forming an image. 2. The illuminating device according to claim 1, wherein the minute lens forming the condenser lens plate has a shape similar to that of the minute condenser mirror. 3. The polarization splitting unit according to claim 1, wherein the polarization splitting unit includes the condenser lens plate and the first condenser mirror plate, and the condenser lens plate and the second condenser unit. An illuminating device characterized by being integrated with an optical mirror plate. 4. The illuminating device according to claim 1, wherein the polarization splitting section is formed of a flat polarization splitting plate. 5. The illuminating device according to claim 1, wherein the right-angle prism forming the polarization splitting section is a liquid-filled prism. 6. The lighting device according to claim 1, wherein the λ / 4 retardation plate is made of TN (twisted nematic) liquid crystal. 7. A structure in which a light source part for emitting a substantially parallel light beam and a polarization separation film made of a dielectric multilayer film are sandwiched by two right-angle prisms, and the light beams emitted from the light source part have polarization directions mutually different from each other. 2 of orthogonal P-polarized light and S-polarized light
It is composed of a polarized light splitting unit that splits and outputs the polarized light of different types, and a plurality of minute light collecting mirrors having a rectangular outer shape. A first condensing mirror plate for forming a secondary light source image, and having substantially the same size and shape as the first condensing mirror plate,
A second condensing mirror plate for condensing the S-polarized light emitted from the polarization separating unit to form a plurality of secondary light source images; the first condensing mirror plate and the polarization separating unit; , And a first λ / 4 phase difference plate and a second λ / which are respectively placed between the second condensing mirror plate and the polarization splitting unit.
4 phase difference plate, and is placed in the vicinity of a position where a plurality of secondary light source images formed by the first light collecting mirror plate and the second light collecting mirror plate are formed, and the first or second Of the same number of minute lenses as the number of minute condenser mirrors constituting the second condenser mirror plate, and the image plane cut out by the first condenser mirror plate and the second condenser mirror plate is superimposed on the illumination area. A condenser lens plate that forms an image, a color separation unit that separates the light that has passed through the condenser lens plate into respective color lights of three primary colors, and three sheets of light that respectively modulate the respective color lights based on a video signal from the outside. A light valve, a color synthesizing unit for synthesizing the modulated lights of the respective color lights modulated by the light valve, and a light projecting unit for projecting the respective color lights synthesized by the color synthesizing unit onto a screen. Projection type Display devices. 8. The color synthesizing means according to claim 7,
A projection type display device having a dichroic prism and having a light guide means in an optical path having the longest optical path length among the optical paths of the respective color lights from the color separation means to the respective light valves.