JPH11119162A - Polarizing device and projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polarizing device and a projection type display device capable of sufficiently exhibiting functions originally included in a conventional method and attaining higher luminance polarization illumination. SOLUTION: In this polarizing device having a light source part 1, a 1st lens plate 2 for dividing light source light projected from the light source part 1 into plural beams determined by an aperture constituted by plural lenses 2a, a 2nd lens plate 3 having plural lenses 3a whose luminescent spots are respectively constituted by plural lenses 2a of the plate 2, a PBS array 4 constituted of plural constituted PBSs 5, 6 for polarizing and separating light beams projected from individual luminous dots of the lenses 3a to P-polarized light and S-polarized light and projecting these polarized light components, and plural 1/2 wavelength plates 7 arranged on the projection face side of the array 4 and capable of converting one polarized light out of P and S polarized light components polarized, separated and projected by the array 4 into the other polarized light, a non-formation area 17 in which any 1/2 wavelength plate 7 is not arranged over the whole surface of plural projection faces of the PBSs 5, 6 constituting the array 4 is set on the approximately center part of the projection face of the array 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing device used for a polarized light illuminating device of a liquid crystal light valve used in a projection type display device, and a light valve illuminated by the polarized light illuminating device using the polarized light device. The present invention relates to a projection display device that projects emitted modulated light as an image on a screen.

[0002]

2. Description of the Related Art Conventionally, as a method of uniformly illuminating a rectangular illumination area such as a liquid crystal light valve, an illumination device using a so-called fly-eye lens plate using two lens plates is known.

In order to improve the illumination efficiency of this illumination device, a polarizing beam splitter array and a half-wave plate are arranged at predetermined positions on a second exit surface of the two lens plates, There has been proposed a polarized light illuminating device aiming at utilization efficiency of light from a light source and a projection display device using the illuminating device (see Japanese Patent Application Laid-Open No. H8-304739).

FIG. 7 shows FIG. 8 used as a description of a polarizing device and a projection type display device described as a modification of the fifth embodiment of the above-mentioned publication.

[0005] In the conventional example shown in FIG.
0 and a parabolic reflector 10 which is a concave mirror such as a parabolic mirror
1 form a light source unit 102, and a substantially parallel light beam emitted from the light source unit 102 enters a first lens plate 104 on which a plurality of lenses 103 are arranged in a plane. Then, the light emitted from the first lens plate 104 is
The light enters the plurality of lenses 106 of the lens plate 105. In this case, since each lens 106 of the second lens plate 105 is formed corresponding to the shape of each lens 103 of the first lens plate 104 and is arranged at the focal position of these lenses 103, Light from each lens 103 of the first lens plate 104 is focused on the lens 106 of the second lens plate 105.

A plurality of polarizing beam splitters (hereinafter referred to as “PBS”) are provided on the exit surface side of the second lens plate 105.
That. ) 107 is disposed, and a polarizing beam splitter array (hereinafter, referred to as a “PBS array”) 108 is disposed.
On the emission surface of the PBS array 108, a half-wave plate 109 is arranged every other PBS 107. Further, a condenser lens 110 is arranged on the exit surface side of the half-wave plate 109.

According to the drawing, the substantially parallel light beam incident on the lens 103 of the first lens plate 104 is condensed on the substantially central portion of the lens 106 of the second lens plate 105 as described above, and exits the lens 106. , P constituting the PBS array 108
The P-polarized light that enters the BS 107, passes through the polarization separation unit 107a disposed obliquely of the PBS 107, and exits as it is, is reflected by the polarization separation unit 107a of the PBS 107, and enters the adjacent PBS 107.
It is polarized and separated into polarized light. The S-polarized light that has entered the adjacent PBS 107 is polarized by the polarization separation unit 1 of the PBS 107.
07a, and is emitted in the same direction as the optical axis incident on the lens 106.

A half-wave plate 109 is disposed on the exit surface of the PBS 107 and the P-polarized light exit surface. P-polarized light incident on the half-wave plate 109 is converted into S-polarized light. As a result, all the incident light source light is emitted as S-polarized light.

The S-polarized light enters the light valve 111 via the condenser lens 110, so that the light valve 111 is efficiently illuminated.

In such a case, by disposing the PBS array 108, the half-wave plate 109, and the like,
Certainly, the first lens plate 104 and the second lens plate 105
Compared to a lighting device that uses only S-polarized light, it is possible to achieve much higher brightness in terms of polarized light illumination to the light valve 111.

In other words, in the method using the first lens plate 104 and the second lens plate 105 and not using the PBS array 108 or the like, since the randomly polarized light is illuminated on the light valve 111, Is used as incident light because it is linearly polarized light in one direction.

[0012]

However, the demand for higher brightness of a projected image of a recent projection type display device has not been stopped, and further higher brightness has been demanded.

[0013] In this respect, the polarized light illuminating device in the conventional method is not always satisfactory as described later, and the present inventors have studied this polarized light illuminating device as a comprehensive polarizing device including a light source section. It has been found that the function inherent in the polarizing device is not sufficiently exhibited.

SUMMARY OF THE INVENTION It is an object of the present invention to sufficiently exhibit the inherent functions of the conventional method and to achieve even higher brightness polarized illumination.

[0015]

In view of such a problem, the invention described in claim 1 is a light source unit and a lens plate in which a plurality of lenses are arranged in a plane, and the light source unit emits light from the light source unit. A first lens plate that divides the light of the light source into a light flux determined by an aperture formed by the plurality of lenses, and another lens plate that has a plurality of lenses in a planar manner,
A second lens plate in which the plurality of lenses of the lens plate respectively form bright spots on the plurality of lenses of the other lens plate, and light emitted from individual bright spots of the plurality of lenses of the second lens plate. A polarizing beam splitter array having a plurality of continuous polarizing beam splitters that are incident, split and separate the incident light into p-polarized light and s-polarized light, and provided on the polarizing beam splitter array emitting surface side; A polarizing device having a half-wave plate for converting one of the P-polarized light and the S-polarized light emitted after being polarized and separated by the beam splitter array into the other polarized light. , The half-wave plate is disposed on the entire surface over a plurality of emission surfaces of the polarization beam splitter constituting the polarization beam splitter array. Characterized in that no non-forming region is a polarizer that has been set.

According to a second aspect of the present invention, a light source unit includes:
A first lens plate that divides light source light emitted from the light source unit into a light flux determined by an aperture formed by the plurality of lenses, and a plurality of lenses. A second lens plate having a planar shape, wherein a plurality of lenses of the first lens plate form bright spots on a plurality of lenses of the other lens plate, respectively, and the second lens plate A plurality of polarization beam splitters into which light emitted from individual bright spots of the plurality of lenses is incident, and the first polarized light that transmits the incident light through a polarization separation unit of the polarization beam splitter; A polarization beam that is reflected by the polarization splitting unit, is incident on an adjacent polarization beam splitter, and emits a second polarization in the same direction as the first polarization by the polarization splitting unit of the adjacent polarization beam splitter. A splitter array, provided on the exit side of the polarizing beam splitter array, for converting one of the first polarized light and the second polarized light emitted after being separated by the polarizing beam splitter array into the other polarized light; In a polarizing device having a two-wavelength plate, a substantially central portion of an exit surface of the polarizing beam splitter array is provided.
The polarizing device is characterized in that the half-wave plate is provided with a non-formation area that is not disposed over the entire surface of a plurality of emission surfaces of the polarization beam splitter constituting the polarization beam splitter array. .

According to a third aspect of the present invention, there is provided a polarizing device including a light source section, and P-polarized light or S-polarized light emitted from the polarizing device.
A color separation optical system that separates polarized light into R light, G light, and B light; a light valve that is arranged for each color light that emits each color light by the color separation optical system by modulating each color light with a signal of each color light; An analysis optical system that detects modulated light from the light emitted from the light valve of each color light, a synthesis optical system that performs color synthesis of each color analysis light by the analysis optical system, and projects the synthesized light by the synthesis optical system. In a projection display device having a projection optical system, the polarizing device is a lens plate in which a light source unit and a plurality of lenses are arranged in a plane, and the light source light emitted from the light source unit is transmitted to the plurality of lenses. A first lens plate for splitting into a light beam determined by an aperture to be configured, and another lens plate having a plurality of lenses in a plane, wherein the plurality of lenses of the first lens plate are respectively Create bright spots on multiple lenses And a polarizing beam splitter that receives light emitted from individual bright points of the plurality of lenses of the second lens plate, separates the incident light into P-polarized light and S-polarized light, and emits the polarized light. A polarizing beam splitter array composed of a plurality of continuous light beams, and one of the P-polarized light and the S-polarized light which is provided on the polarization beam splitter array emission surface side and is emitted after being polarized and separated by the polarization beam splitter array. 1 for converting to polarized light
A polarizing plate having a half-wave plate, wherein the 1 /
The projection type display device may be a polarizing device in which a non-formation area is set in which a two-wavelength plate is not disposed on the entire surface of a plurality of emission surfaces of the polarization beam splitter constituting the polarization beam splitter array. Features.

According to a fourth aspect of the present invention, there is provided a polarizing device including a light source unit, a color separation optical system for separating P-polarized light or S-polarized light emitted from the polarizing device into R light, G light and B light. A light valve disposed for each color light for modulating each color light by the signal of each color light by the color separation optical system and emitting the light, and a light analysis optical system for detecting a modulated light from the light emitted from the light valve of each color light And a combining optical system that combines the colors of the color analysis light by the analysis optical system, and a projection optical system that projects the combined light by the synthesis optical system, wherein the polarizing device includes a light source unit. A first lens plate that divides the light source light emitted from the light source unit into a light flux determined by an aperture formed by the plurality of lenses; Another lens with a planar lens A second lens plate, wherein the plurality of lenses of the first lens plate form bright spots on the plurality of lenses of the other lens plate, respectively, and a plurality of lenses of the second lens plate. A plurality of polarization beam splitters into which light emitted from each of the bright spots is incident are sequentially formed, and the incident light is transmitted to a first polarization transmitting through the polarization splitting unit of the polarization beam splitter, and to the polarization splitting unit. A polarized beam splitter array that causes the polarized beam splitter of the adjacent polarized beam splitter to emit the second polarized light in the same direction as the first polarized light by the polarized beam splitter of the adjacent polarized beam splitter; A first polarized light and a second polarized light, which are provided on the surface side and are polarized and separated by the polarization beam splitter array and converted into the other polarized light. A polarizing beam splitter having a half-wave plate, wherein the half-wave plate has an emission surface of the polarization beam splitter constituting the polarization beam splitter array substantially at a center of an emission surface of the polarization beam splitter array. The projection type display device is a polarizing device in which a non-formation region which is not disposed on the entire surface is set over a plurality of the above.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

[Analysis of Conventional Method for Achieving the Present Invention] FIG. 5 is an enlarged view showing a part of a polarizing device according to the conventional method. In this figure, a first lens plate 104, a second lens plate 105, a PB
An S-array 108 and a half-wave plate 109 are described. The polarization device here includes the light source unit 102 in addition to the above, but does not include the condenser lens 110. The polarization illumination device is a concept that includes the condenser lens 110 in the polarization device.

According to the description of this figure, the light source light incident on the first and second lens plates 104 and 105 near the optical axis is the second light.
It is described that the light is condensed on the lens 106 of the lens plate 105 and a small bright spot is formed at the center of the lens 106.

However, the present inventors have described that the center portion of the first lens plate 104 and the second lens plate 105 in the above-mentioned conventional polarizing device is as described in the conventional example (forming a small bright spot). Rather, the size of the bright spot of the lens 106 substantially at the center of the second lens plate 105 covers almost the entire opening formed by the lens 106, and the luminance distribution of the larger bright spot has a central portion. I found that the periphery was higher.

This is understood from the fact that the light source lamp 100 having a predetermined size is provided at the center of the light source unit 102, and this state is described in FIG. That is, the reason is that the light flux does not enter the lens 103 disposed substantially at the center of the first lens plate 104 in a direction parallel to the optical axis but enters at a predetermined inclination. The lens 103
Is incident on the corresponding lens 106 of the second lens plate 105 as a bright point of the entire aperture formed by the lens 106.

That is, the lens 1 of the second lens plate 105
At 06, the light fluxes shown in the figure enter the central portion and the peripheral portion of the lens 106. Among them, there are more light beams incident on the peripheral portion than in the central portion shown in FIG. This is because there are more light beams entering the lens 103 of the first lens plate 104 at an angle to the optical axis than light beams incident parallel to the optical axis.

The light beam shown in FIG.
06, passes through the lens 106, and
07, and the P-polarized light transmitted through the polarization separation unit 107a, and the P-polarized light reflected by the polarization separation unit 107a
The light is separated into S-polarized light incident on S107. The S-polarized light is reflected by the polarized light separating portion 107a of the adjacent PBS 107 and exits the PBS 107. The P-polarized light is a half-wave plate 10 arranged on the exit surface of the PBS 107.
9, the light is converted into S-polarized light (−S), and is eventually emitted as S-polarized light.

The light valve 111 is illuminated by the S-polarized light.

On the other hand, the lens 10 near the optical axis shown in FIG.
6 enters the PBS 107 via the lens 106, and the P-polarized light that passes through the polarization separation unit 107a of the PBS 107 and exits is 1 /
Since it is out of the two-wavelength plate 109, it is emitted as P-polarized light (-P, -P) as it is. In addition, PBS1
The S-polarized light reflected by the polarization separation unit 107a enters the adjacent PBS 107 and is polarized by the polarization separation unit 107a.
Then, the reflected light is emitted from the PBS 107 and converted into P-polarized light by the half-wave plate 109 arranged on the emission surface.

The P-polarized light is absorbed by an S-polarized light transmitting polarizing plate (not shown) arranged on the incident side of the incident light valve constituting the light valve 111, and the illumination light of the light valve 111, finally , Not used as projection light.

Therefore, the S-polarized light, which is originally required as the incident polarized light of the light valve 111, is formed only from the light rays incident near the center of the lens 106, and the light rays incident on the peripheral portion are emitted as P-polarized lights. This does not contribute to the illumination of the light valve 111, and unnecessary P-polarized light is generated from the peripheral portion (central portion) of the second lens plate 105 along the optical axis. As described above, the P-polarized light that does not contribute to the illumination of the light valve 111 is generated, and thus, the projection display device of the above-described conventional publication does not sufficiently satisfy the requirement of increasing the brightness of the projected image.

An embodiment of the present invention for solving the above-described problem will be described below based on such an analysis.

[First Embodiment of the Invention] FIGS.
FIG. 1 is a diagram illustrating a polarization device according to a first embodiment of the present invention and a projection display device employing the same.

According to FIG. 1, the light source 1 is composed of a lamp 1a and a concave mirror 1b formed of a parabolic mirror. The light enters the first lens plate 2 on which the lens 2a is arranged in a plane via the ultraviolet absorption filter, and is split into light beams determined by the openings formed by the individual lenses 2a of the first lens plate 2. . Then, the light beam is incident on the second lens plate 3.

The second lens plate 3 has a plurality of lenses 3a.
Are arranged in a plane, these lenses 3a are arranged corresponding to the individual lenses 2a of the first lens plate 2, and are set at the focal positions of the respective lenses 2a.

Although each of these lenses 2a and 3a is actually formed as 8 × 10 in length as described later, FIG. 1 shows five lenses as a sectional configuration diagram because it is too fine. .

The first lens plate 2 and the second lens plate 3 constitute a so-called fly-eye integrator.

Then, the light source light passing through the lens 2a of the first lens plate 2 is transmitted to the corresponding second lens plate 3 as described above.
Through the lens 3a, and is incident on the PBS array 4 arranged close to or adhered to the exit surface of the second lens plate 3.

The PBS array 4 is configured by alternately arranging a plurality of PBSs 5 and 6 having a square pillar shape in cross section, and in this embodiment, sixteen PBSs 5 and 6 are continuously arranged with their side surfaces adhered to each other. It has a plate shape. In FIG. 1, 16 PBSs 5 and 6 are omitted because they are too fine and difficult to see.

Of these PBSs 5 and 6, PBS5 is:
The PBS 6 is arranged corresponding to the center of each lens 3a of the second lens plate 3, and the PBS 6 is arranged corresponding to the boundary between the lenses 3a.

Each of the PBSs 5 and 6 has a polarization separation unit 5.
a and 6a are arranged diagonally and inclined by 45 degrees with respect to the optical axis, and these polarization splitting sections 5a and 6a are all arranged in parallel.

A 波長 wavelength plate 7 is adhered and arranged at a predetermined position on the emission surface of the PBS array 4.

As described above, the lens 3a of the second lens plate 3
Passes through the lens 3a and passes through the PB.
The light is incident on the PBS 5 constituting the S array 4 and the PBS 5
5, the P-polarized light passing through the polarization separation section 5a and the PBS 5
S-polarized light reflected by the polarization separation unit 5a, is emitted from the side surface of the PBS 5, is incident on the adjacent PBS 6, and is polarized and separated into S-polarized light reflected by the polarization separation unit 6a of the adjacent PBS 6. You.

The 波長 wavelength plate 7 is disposed on the exit surface of the adjacent PBS 6, and is converted into P-polarized light via the wavelength plate 7 and emitted.

As described above, the light from the light source is all P-polarized light, and is composed of the light source unit 1, the first lens plate 2, the second lens plate 3, the PBS array 5, and the half-wave plate 7 described above. Emit a polarizing device that is an optical system.

The P-polarized light emitted from the polarizing device is incident on the cross dichroic mirror 11 via the condenser lens 8. This cross dichroic mirror 11 is composed of a B light reflecting dichroic mirror 10 and G,
The R-light reflecting dichroic mirror 9 is arranged so as to be orthogonal to each other and incident at an angle of 45 degrees with respect to the incident optical axis. By the cross dichroic mirror 11, R light, which is parallel to each other and is the optical axis in the opposite direction, and G, R
It is color-separated into mixed light.

The color-separated B light is transmitted to the bending mirror 1
2 and the optical axis is changed to a right angle,
The light enters a polarization beam splitter 13B for B light in which a polarization separation unit is disposed so as to transmit light.

On the other hand, the R and G mixed light travels with the bending mirror 14 changing the optical axis to a right angle, and the G light is arranged on the optical axis at an incident angle of 45 degrees with respect to the incident optical axis. The G light that is incident on the light reflecting dichroic mirror 15 and is reflected and travels while changing the optical axis to a right angle, and the R light that travels as it is
Color separated into light and light.

The color-separated G light and R light are respectively P-polarized light, and the respective lights are polarized light splitters 13G and R for G light, each of which is provided with a polarization separation part such that the P-polarized light is transmitted. The light enters the polarization beam splitter 13R for light.

That is, the dichroic mirrors 9 and 10
And a dichroic mirror 15 to constitute a “color separation optical system” that separates the light into R, G, and B light.

The polarization beam splitters 13B, 1 for each color light
3G, 13R, and enters the polarization beam splitter 13
B, 13G, near the exit surface of each color light transmitted through 13R,
A light valve 16B for B light, a light valve 16G for G light, and a light valve 16R for R light are arranged respectively.

The light valves 16R, 16G and 16B used in the present embodiment are electric writing type reflection type light valves, and only light-polarized light (P-polarized light) of a predetermined pixel portion is selected by each color signal. As the modulated light (S-polarized light), the non-selected portion has a function of reflecting and emitting as the same P-polarized light as the incident light.

Each color light valve 16R, 16G, 1
The light emitted from 6B is again incident on the polarization beam splitters 13B, 13G, and 13R for each color light, and reflects only the modulated light (S-polarized light) by the polarization splitters of the polarization beam splitters 13B, 13G, and 13R. The light is analyzed and emitted, and the unmodulated light (P-polarized light) is allowed to proceed as it is and discarded. These polarization beam splitters 13B, 13G,
13R is a light valve for each color light 16R, 16G, 16
An "analysis optical system" for detecting modulated light from the B emission light is configured. Then, the respective color analysis lights are incident on the cross dichroic prisms 18 constituting the “combining optical system” from different incident surfaces, respectively, and perform color combining.

This cross dichroic prism 18
Has a B light reflecting dichroic film 18B and R
A prism in which the light reflecting dichroic films 18R are arranged so as to be orthogonal to each other. The R light and the B light, which are the analysis light, incident on the prism 18, are reflected by the dichroic film 18R and the dichroic film 18B and The optical axis is changed to a right angle, the light beams travel in the same direction, and emerge from the prism 18.

On the other hand, the detection light of the G light passes through the two dichroic films 18B and 18R as it is and proceeds, and the R light,
By traveling and exiting in the same optical axis direction as B light,
The color synthesis of the R, G, B light is achieved.

The combined light is incident on a projection lens 19 constituting a “projection optical system” and projected on a screen (not shown) as a full-color image.

The above is the configuration of the projection type display device according to the present invention.

Here, the polarizing device according to the present invention will be described in more detail with reference to FIGS.

FIG. 4 shows the second embodiment of the polarizing device according to the present invention.
FIG. 3 shows a perspective view of the lens plate 3, the PBS array 4, and the half-wave plate 7 as viewed from the exit surface side of the member.

The lenses 3a of the second lens plate 3 have an 8 × 10 array as described above.
A PBS array 4 composed of a plurality of PBSs 5 and 6 is adhered to the emission surface side, and polarization separation units 5a and 6a of the PBSs 5 and 6 are attached.
Are all arranged in parallel.

The width of the PBSs 5 and 6 is half the width of the lens 3a of the lens plate 3, and
Are arranged so as to coincide with a substantially central portion of each lens 3a of the second lens plate 3, and the PBS 6 is arranged so as to coincide with a boundary portion of each lens 3a of the second lens plate 3.

Further, on the exit surface side of the PBS array 4,
The half-wave plate 7 (hatched portion in FIG. 4) is adhered, but the arrangement position is disposed every other boundary portion of each lens 3a except for the approximate center of the array 4. P
It is arranged in front of the exit surface of BS6.

As shown in FIG. 4, the 波長 wavelength plate 7 is provided at a substantially central portion of the exit surface of the PBS array 4.
A rectangular non-formation region 17 that is not disposed on the entire surface of a plurality of emission surfaces of the PBSs 5 and 6 that constitute the array 4 is provided. The non-formation area 17 corresponds to four (2 × 2) lenses 3 a of the second lens plate 3.

The line AA ′ shown in FIG. 4 indicates the position where the PBS array 4 and the second lens plate 3 are cross-sectioned along the width direction at substantially the center in the vertical direction.
The -B 'line indicates the position where the upper part is sectioned along the width direction.

FIG. 2 shows the polarizing device, the condenser lens 8, the polarizing beam splitter 13 and the light valve 1 according to the present invention, as viewed from above the section taken along the line AA '.
FIG. 3 is a configuration diagram and a ray diagram illustrating FIG. 6, and FIG. 3 shows a polarizing device according to the present invention, a condenser lens 8, a polarizing beam splitter 13, and a light valve 16 as viewed from above the section taken along the line BB '. Are shown in a configuration diagram and a ray diagram.

In FIGS. 2 and 3, the R light, the G light and the B light should be described as shown in FIG. 1, but the light valves 16B, 16G, 16
Since the optical path lengths up to R are all the same, the description of the color separation optical system is omitted, and each light valve 16B, 16G,
16R will be described as the light valve 16, and the polarization beam splitters 13B, 13G, and 13R for each color light will be described as the polarization beam splitter 13.

According to FIG. 2, the substantially parallel light source light emitted from the light source unit 1 is transmitted to the first lens plate 2 as described above.
Is split into a plurality of luminous fluxes by an aperture formed by the lens 2a (consisting of 8 × 10) constituting the lens plate 2,
Further, each split light beam is a second light beam corresponding to the lens 2a.
The light is incident on the lens 3 a constituting the lens plate 3. However, due to the characteristics of the light source unit 1, the outer periphery of the second lens plate 3 except for the substantially central portion has the second outermost portion shown in FIG. As described in the lens 3a of the lens plate 3, the lens 3a is condensed at the center of the lens 3a and forms a bright point as a point light source.

The light emitted from the bright point of the lens 3a is
As shown in FIG. 2, the PBS 5 constituting the PBS array 4
P-polarized light that is incident on one of the
The light is polarized and separated into S-polarized light reflected by the polarization separation unit 5a. The S-polarized light enters the adjacent PBS 6, is reflected and emitted by the polarization splitting portion 6a of the PBS 6, and is converted into P-polarized light by the half-wave plate 7 arranged on the emission surface. The P-polarized light emitted from these two PBSs 5 and 6 passes through the condenser lens 8 and the polarization beam splitter 13, and passes through the light valve 16.
To efficiently illuminate the entire area. Note that, as described above, the polarization beam splitter of the polarization beam splitter 13 is arranged to transmit incident polarized light, and thus is as described above.

However, as described above, the lens 3a at the substantially central portion of the second lens plate 3 is different from the outer peripheral portion of the second lens plate 3 due to the influence of the light source lamp 1a and the like. There is no bright spot in the part, the bright spot has a spread,
As for the spread, a high-luminance portion occurs around the center of the lens 3a.

In the present embodiment, as shown in FIG. 4, the central 2 × 2 portion of the 8 × 10 arrangement of the lenses 3a of the second lens plate 3 is as shown in the drawing. The entire portion is a non-formed region 17 where the half-wave plate 7 is not arranged.

For the lens 3a of the second lens plate 3 adjacent to the optical axis in FIG. 2, a bright point is generated at the peripheral portion of the lens 3a as described above. The light emitted from is incident on the PBS 6. Then, the P-polarized light transmitted through the polarization splitting section 6a of the PBS 6 becomes PB
Since the half-wave plate 7 is not disposed on the exit surface side of S6, the light is emitted as it is as P-polarized light. The S-polarized light reflected by the polarization separation unit 6a enters the adjacent PBS 5, is reflected by the polarization separation unit 5a, and the 波長 wavelength plate 7 is not disposed on the PBS 5 emission surface side. Therefore, the light is emitted as it is as S-polarized light.

The P-polarized light and the S-polarized light emitted from the polarizing device are incident on the polarizing beam splitter 13 by the condenser lens 8, and the P-polarized light therein is
6 will be illuminated.

As described above, in the related art, as described above, most of the light enters the polarization beam splitter 13 as S-polarized light and is discarded. In the present embodiment, half of the light is illuminated to the light valve 16. Can be used as light.

On the other hand, FIG. 3 shows a configuration diagram and a ray diagram by cutting along the line BB 'in FIG. 4, that is, at the outer peripheral portion of the second lens plate 3 other than the substantially central portion.

In the outer peripheral portion, the influence of the lamp 1a and the like of the light source section 1 is not so much affected, and the light source light incident on the lens 2a of the first lens plate 2 To form a bright spot substantially at the center of the lens 3a.

FIG. 3 shows a ray diagram of the lens 3a on both sides and the center in the width direction (not the center of the second lens plate 3) on the outer peripheral portion of the second lens plate 3, as in FIG. In the outer peripheral portion, as shown in FIG. 4, the 波長 wavelength plate 7 emits the PBS 5 arranged at a position where the incident light that is individually incident on the lens 3 a of the second lens plate 3 is transmitted as it is. PBs that are not placed on the plane and are adjacent to them
It is configured to be arranged on the exit surface of S6.

According to this, the light source light beams incident on the lenses 2a on both sides of the outer peripheral portion of the first lens plate 2 are condensed on the corresponding lenses 3a of the second lens plate 3, and shine on the lenses 3a. Make up the points. The light emitted from this luminescent spot is reflected on the PBS array 4 arranged on the exit surface of the lens 3a.
Is polarized and separated into P-polarized light that passes through and exits the PBS 5 and S-polarized light that is reflected by the polarization splitting unit 5a. The S-polarized light is incident on the adjacent PBS 6,
The light is reflected and emitted by the polarization separation section 6a, converted into P-polarized light by the half-wave plate 7 disposed on the emission surface of the PBS 6, and emitted.

The light source light incident on the lens 2a at the central portion in the width direction at the outer peripheral portion of the first lens plate 2 corresponds to the second lens plate 3 in the same manner as on both sides of the outer peripheral portion of the first lens plate 2 described above. Since a bright spot is formed substantially at the center of the lens 3a, the light is incident on the PBS 5 of the PBS array 4 similarly formed on the back of the lens 3a, and is reflected adjacent to the P-polarized light transmitted through the PBS 5. The light is separated into S-polarized light incident on the PBS 6. Then, the S-polarized light is converted into P-polarized light by the half-wave plate 7 arranged on the exit surface of the PBS 6 and emitted.

Then, the P emitted from the polarizing device
The polarized light similarly illuminates the light valve 16 via the polarizing beam splitter 13 by the condenser lens 8.

As described above, in the present invention, in view of the fact that the light amount distribution is higher at the substantially central portion of the second lens plate 3 than at the center of the lens 3a constituting the lens plate 3, The non-formation area 17 is not set at the center of the second lens plate 3 on the emission surface of the PBSs 5 and 6 constituting the PBS array 4 arranged at the back of the partial lens. Make up. Thus, in the conventional method, the substantially central portion has the characteristic of emitting polarized light different from that of the outer peripheral portion, and the light valve 16 cannot be illuminated with the emitted light. If
Although not all of the light emitted from the portion, approximately half of the light can be used as illumination light for the light valve 16, and as a result, high-luminance illumination is achieved for the light valve 16. And a high-brightness projected image can be obtained.

The first lens plate 2 and the second lens plate 3 used in the present invention are each 8 × 10.
Lens plate having a number of lenses 2a and 3a,
The position of the substantially central portion where the non-forming region 17 where the wave plate 7 is not disposed is set is the horizontal 8 × vertical 10 lenses 2a, 3
Although the position of 2 × 2 at the center of “a” is set, the present invention is not limited to this configuration. That is, the position of the substantially central portion is the same at the position centered on the optical axis, but the size of the region is due to the size of the lamp and the like, and is limited to this size in the present embodiment. Not done. Further, the shape of the substantially central portion where the non-formation region 17 is set is a square in the above embodiment, but is not limited to this, and it is a matter of course that the shape may be a circle or an ellipse. Further, the lenses 2a and 2a constituting the first lens plate 2 and the second lens plate 3,
Neither the number of 3a nor the arrangement thereof is limited to this method.

Further, in the projection type display device shown in the present embodiment, the light valves 16R, 16G, 16B are configured so that the P-polarized light transmitted through the polarization beam splitters 13R, 13G, 13B for the respective color lights enters. Although it was in the form, the S-polarized light reflected through the polarization splitters of the polarization beam splitters 13R, 13G, and 13B was incident so that
A configuration is also conceivable in which the light valves 16R, 16G, 16B for the respective colors are arranged near the exit surfaces of the polarization beam splitters 13R, 13G, 13B. In this case, it is necessary to configure the polarized light emitted from the polarized light illuminating device according to the present embodiment to be S-polarized light. For this purpose, the non-forming region 17 at the center shown in FIG.
The positions of the half-wavelength plates 7 arranged in every other row on the outer peripheral portion may be reversed. That is, in FIG. 4, in the outer peripheral portion, the half-wave plate 7 may not be provided in the hatched portion, but may be provided in the white portion.

[0080]

As described above, according to the invention described in each of the claims, the substantially central portion of the second lens plate is located closer to the peripheral portion than the central portion of the lens constituting the lens plate. In view of the fact that the light amount distribution is higher, the half of the exit surface of the polarizing beam splitter array
Since a non-formation region that is not disposed over the entire surface of a plurality of emission surfaces of the polarization beam splitters constituting the polarization beam splitter array is set, the wavelength plate is arranged from a position corresponding to the portion in the conventional method. Although the emitted light cannot illuminate the light valve, the light emitted from the portion can be used as illumination light for the light valve. As a result, it is possible to achieve high-luminance illumination of the light valve, and to obtain a great effect that a high-luminance projected image can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a polarizing device and a projection display device according to an embodiment of the present invention.

FIGS. 2A and 2B are a configuration diagram and a ray diagram cut at a substantially central portion for describing the polarization device according to the embodiment. FIGS.

FIGS. 3A and 3B are a configuration diagram and a light ray diagram, respectively, cut at an outer peripheral portion for explaining the polarization device according to the embodiment; FIGS.

FIG. 4 is a perspective configuration diagram of a polarization beam splitter array and the like used in the polarization device according to the embodiment.

FIG. 5 is an enlarged view of a main part of a conventional polarized lighting device.

FIG. 6 is a diagram illustrating a defect in a main part of the polarized light illuminating device of the conventional example.

FIG. 7 is an overall explanatory configuration diagram of the conventional polarized illumination device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light source part 2 1st lens plate 2a Lens which comprises a 1st lens plate 3 2nd lens plate 3a Lens which comprises a 2nd lens plate 4 PBS array 5,6 PBS which comprises a PBS array 7 1/2 wavelength plate 8 Condenser lens 9,10,11,15 Dichroic mirror (color separation optical system) 12,14 Folding mirror 13,13R, 13G, 13B Polarization beam splitter (analysis optical system) 16,16R, 16G, 16B Light valve 17 Non Forming area 18 Cross dichroic prism (synthetic optical system) 19 Projection lens (projection optical system)

Claims (4)

[Claims] 1. A lens plate in which a light source unit and a plurality of lenses are arranged in a plane, and wherein a light source emitted from the light source unit is divided into light beams determined by openings formed by the plurality of lenses. One lens plate and another lens plate having a plurality of lenses in a plane,
A plurality of lenses of the first lens plate each forming a luminescent spot on a plurality of lenses of the other lens plate; and a plurality of lenses emitted from the respective luminescent spots of the plurality of lenses of the second lens plate. A polarizing beam splitter array, which is constituted by a plurality of consecutively arranged polarizing beam splitters for separating the incident light into P-polarized light and S-polarized light and emitting the polarized light, and provided on the polarization beam splitter array emission surface side. A polarizing plate comprising: a half-wave plate for converting one of the P-polarized light and the S-polarized light emitted after being polarized and separated by the polarization beam splitter array to the other polarization; In a substantially central portion of the exit surface of the polarizing beam splitter array, the half-wave plate covers the entire exit surface of a plurality of exit surfaces of the polarizing beam splitter constituting the polarizing beam splitter array. Polarization apparatus characterized by non-forming region that is not location is set. 2. A lens plate in which a light source unit and a plurality of lenses are arranged in a plane, the light source unit emitting light from the light source unit into light beams determined by openings formed by the plurality of lenses. One lens plate and another lens plate having a plurality of lenses in a plane,
A plurality of lenses of the first lens plate each forming a luminescent spot on a plurality of lenses of the other lens plate; and a plurality of lenses emitted from the respective luminescent spots of the plurality of lenses of the second lens plate. A plurality of polarization beam splitters into which the incident light is incident, the first polarization transmitting the incident light through the polarization separation unit of the polarization beam splitter, and the adjacent polarization reflected by the polarization separation unit and adjacent polarization A polarizing beam splitter array that is incident on the beam splitter and emits the second polarized light in the same direction as the first polarized light by the polarization splitting unit of the adjacent polarizing beam splitter; A half-wave plate for converting one of the first polarized light and the second polarized light emitted after being polarized and separated by the polarizing beam splitter array into the other polarized light; In the polarizing device having the polarizing beam splitter array, the 波長 wavelength plate is disposed on the entire surface over a plurality of the emitting surfaces of the polarizing beam splitters constituting the polarizing beam splitter array at a substantially central portion of the emitting surface of the polarizing beam splitter array. A non-forming region that is not set is set. 3. A polarizing device including a light source unit, and P-polarized light or S-polarized light emitted from the polarizing device is converted into R light, G light, and G light.
A color separation optical system that separates the light into B light, a light valve that is arranged for each color light that modulates and emits each color light by the signal of the color light by the color separation optical system, and a light valve for each color light. An analyzing optical system for analyzing modulated light from the emitted light, a combining optical system for combining colors of each color analyzing light by the analyzing optical system, and a projection optical system for projecting combined light by the combining optical system. In the projection type display device, the polarizing device is a lens plate in which a light source unit and a plurality of lenses are arranged in a plane, and the light source light emitted from the light source unit is determined by an aperture formed by the plurality of lenses. A first lens plate for splitting the light beam to be split, and another lens plate having a plurality of lenses in a plane,
A plurality of lenses of the first lens plate each forming a luminescent spot on a plurality of lenses of the other lens plate; and a plurality of lenses emitted from the respective luminescent spots of the plurality of lenses of the second lens plate. A polarizing beam splitter array, which is constituted by a plurality of consecutively arranged polarizing beam splitters for separating the incident light into P-polarized light and S-polarized light and emitting the polarized light, and provided on the polarization beam splitter array emission surface side. A polarizing plate comprising: a half-wave plate for converting one of the P-polarized light and the S-polarized light emitted by the polarization beam splitter array after being separated by the polarization beam splitter array to the other polarization; At substantially the center of the exit surface of the splitter array, the half-wave plate is provided over the entire exit surface of a plurality of polarization beam splitters constituting the polarization beam splitter array. Projection display device which is a polarization device non-forming region that is not location is set. 4. A polarization device including a light source unit, a color separation optical system for separating P-polarized light or S-polarized light emitted from the polarization device into R light, G light and B light, and each color light by the color separation optical system. A light valve arranged for each color light that emits light by modulating each color light signal with the signal of each color light; a light analysis optical system that detects modulated light from light emitted from the light valve of each color light; In a projection display apparatus including: a combining optical system that combines colors of the respective color detection lights, and a projection optical system that projects combined light by the combining optical system, the polarizing device includes: a light source unit; A first lens plate that divides the light source light emitted from the light source unit into a light flux determined by an aperture formed by the plurality of lenses, and a lens plate that has a plurality of lenses in a plane. Lens plate,
A second lens plate in which the plurality of lenses of the first lens plate respectively form bright spots on the plurality of lenses of the other lens plate; and emitting light from individual bright spots of the plurality of lenses of the second lens plate. And a plurality of polarization beam splitters into which the divided light is incident, and the incident light is reflected by the polarization separation unit and adjacent to the first polarization transmitted through the polarization separation unit of the polarization beam splitter. A polarization beam splitter array that causes the polarization beam splitter to emit the second polarization in the same direction as the first polarization by the polarization splitting unit of the adjacent polarization beam splitter; and a polarization beam splitter array provided on the polarization beam splitter array emission surface side. A half-wave plate for converting one of the first polarized light and the second polarized light emitted after being polarized and separated by the polarizing beam splitter array to the other polarized light In the polarization device, the half-wave plate extends over a plurality of emission surfaces of the polarization beam splitters constituting the polarization beam splitter array at a substantially central portion of an emission surface of the polarization beam splitter array. A projection display device, which is a polarizing device in which a non-formation region that is not disposed on the entire surface is set.