JP2002296676A - Projector device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector device in which the interference between a quartz panel and a projection lens is capable of being eliminated and hence optical conditions required for the projection lens are relieved and further both small sized and high definition are achieved even when the quartz panel is made small and has a high definition. SOLUTION: In the projector device, the emitted light from a light source part 110 is incident upon a means 120 for color separation and synthesis and then is color-separated. The separated color lights are each made incident upon reflection type quartz panels 151 to 153, and the reflected lights thus obtained are introduced into a means for color separation and synthesis 120 and then are synthesized, and the obtained synthesized light is incident upon a projection lens 160 and then is projected. The means for color separation and synthesis 120 is equipped with a polarizing beam splitters 121 to 124 having polarized light separating planes which are orthogonal to each other. Three main faces out of four main faces, which are adjacent to each other, of the polarizing beam splitters 121 to 124 are provided with respective quartz panels 151 to 153 and the last main face is provided with the projection lens 160.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LCOS (Liquid
The present invention relates to a so-called three-panel type projector device using three reflective light modulation elements such as a crystal on silicon (Panel) panel.

[0002]

2. Description of the Related Art The development of a reflection type liquid crystal panel has been achieved by reducing the size from 0.9 inch square to 0.7 inch square or less.
At the same time, the resolution has been advanced from XGA to SXGA or higher. In recent years, with the miniaturization and high definition of the reflective liquid crystal panel, the reflective liquid crystal panel has been used in projector devices.

FIG. 4 shows a schematic configuration of a conventional projector device using a reflection type liquid crystal panel. In the following description, a narrow-band retarder refers to a light beam in a predetermined wavelength range, in which the polarization direction is selectively rotated by 90 degrees, that is, the light beam of the P-polarized component is converted to S-polarized light, Light flux P
Refers to an element that converts polarized light. For example, a red component narrow band retarder selectively rotates the polarization direction of a light beam in a red wavelength region by 90 degrees.

In this projector device, the S-polarized white light emitted from the lamp 11 is selectively rotated by 90 degrees by the green component narrow-band retardation plate 31 so that the polarization direction of the green component light (green light) is rotated by 90 degrees. That is, the light is converted into P-polarized light, and its output is converted into green light, red light (red light) and blue light (blue light) by a first polarizing beam splitter (PBS) 21. Separated.

The green light transmitted and separated by the first PBS 21 is incident on the second PBS 22. Second PBS2
The green light incident on 2 passes through the polarization splitting surface and is incident on the green component liquid crystal panel 51.

The green light incident on the green component liquid crystal panel 51 has a polarization direction of 90 degrees for the green light incident on a pixel to be displayed in green, based on image information of the green component input from an image processing device (not shown). The light is rotated, that is, converted into S-polarized light and reflected, and the output is again incident on the second PBS 22. The green image light that has entered the second PBS 22 is reflected by the polarization splitting surface thereof, and
Is incident on.

On the other hand, the red light and the blue light reflected and separated by the first PBS 21 selectively rotate the polarization direction of the red light by 90 degrees by the red component narrow band wave plate 32, that is, P light.
The light is converted into polarized light, and its output is separated into red light and green light by the third PBS 23.

The red light transmitted and separated by the third PBS 23 is incident on a red component liquid crystal panel 52.

The red light incident on the red component liquid crystal panel 52 changes the polarization direction of the red light incident on the pixel to be displayed in red by 90 degrees based on the red component image information input from an image processing device (not shown). The output is rotated, that is, converted into S-polarized light, and the output is again incident on the third PBS 23.

The red image light that has entered the third PBS 23 is reflected by the polarization splitting surface thereof, and then the polarization direction of the red light is selectively rotated by 90 degrees by the red component narrow band retardation plate 33, ie, The light is converted into P-polarized light and is incident on the fourth PBS 24.

The blue light reflected and separated by the third PBS 23 is incident on a blue component liquid crystal panel 53.

The blue light incident on the blue component liquid crystal panel 53 has a polarization direction of 90 degrees for the blue light incident on the pixel to be displayed in blue, based on the image information of the blue component input from an image processing device (not shown). The light is rotated, that is, converted into P-polarized light, and the output is again incident on the third PBS 23.
The blue image light that has entered the third PBS 23 passes through the polarization splitting surface and the red narrow-band retardation plate 33, and becomes the fourth P-beam.
It is incident on BS24.

Then, the green image light incident on the fourth PBS 24 is reflected by the polarization separation surface, and the blue image light and the red image light pass through the polarization separation surface. As a result, each of the three primary colors is Image light is synthesized. 4th PB
The image light synthesized in S24 is enlarged and projected from the projection lens 60 and displayed on a screen (not shown).

Thus, the projection lens 6 can be
There is no sneak in the optical path to zero, and it is possible to reduce the size of the device.

However, in the conventional projector device, since the projection lens 60 and the green component liquid crystal panel 51 are arranged adjacent to the same main surface, the projection lens
0 and the frame 51a of the green component liquid crystal panel 51 interfere with each other. Therefore, the distance D2 between the projection lens 60 and the fourth PBS 24 is equal to the distance between the projection lens 60 and the green component liquid crystal panel 51.
In order to avoid interference with the support frame 51a that supports
At least the thickness of the support frame 51a must be set.

As the size of the liquid crystal panel becomes smaller and the resolution becomes higher, the size of the color separation / combination PBS becomes smaller. However, not only the liquid crystal panel 51 for green color, but no matter how small the liquid crystal panel is, its thickness hardly changes. Therefore, as the size of the liquid crystal panel becomes smaller, the projection lens 60 becomes smaller.
The distance D2 between the projection lens 60 and the fourth PBS 24 has a large effect on the back focus distance of the projection lens 60, that is, the amount by which the back focus distance of the projection lens 60 is shortened is reduced as compared with the miniaturization of the liquid crystal panel. come.

By the way, if the F number of the lens is the same, the aperture of the projection lens 60 increases as the back focus distance of the projection lens 60 increases. When the diameter of the projection lens 60 increases, off-axis elements increase and aberration increases, and an aberration correcting lens, an achromatic lens, and the like must be further added to correct the aberration. For this reason, both the diameter and the number of the projection lenses 60 increase to increase the size, and in some cases, the projection lens 60 that satisfies the required optical conditions cannot be manufactured, which may hinder miniaturization of the projector device. .

Conversely, in order to maintain the aperture of the projection lens 60, it is necessary to reduce the angle (dispersion angle) of light that can be captured by the projection lens 60. In this case, the projection lens 6
There is a problem in that the amount of light taken by 0 decreases, and the projected image becomes dark.

Furthermore, in this type of projector device, as the size of the liquid crystal panel is reduced and the definition is increased, the MTF (Modulation Transfer Function) required for the projection lens is increased.
However, there is a problem that optical conditions such as the condition (1) and the condition for correcting chromatic aberration become severe.

[0020]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been developed in view of the above problems. An object of the present invention is to provide a more compact and high-definition projector device which can eliminate interference with a projection lens, thereby relaxing optical conditions required for the projection lens.

[0021]

According to a first aspect of the present invention, there is provided a projector device, wherein light emitted from a light source is separated into first to third color lights by a color separation / combination means. The third color light is optically modulated by the corresponding reflection type light modulation means, and the image light obtained by combining the modulated color lights by the color separation / combination / separation means is enlarged and projected by the projection optical system. In the projector device, the color separation / combination means includes polarization separation means having polarization separation planes orthogonal to each other, and first to third reflection-type light modulation means are provided on three of the four main faces of the polarization separation means. Are arranged, and the projection optical system is arranged on the remaining one main surface.

According to a second aspect of the present invention, in the first aspect, the polarization separating means separates the light emitted from the light source means into a first color light and second and third color lights having different polarization directions from each other. A first polarization beam splitter that emits light in directions orthogonal to each other, and a first reflection beam splitter that is disposed on the first polarization beam splitter so as to face the emission side of the first color light, and to which the first color light reaches A second polarization beam splitter on which the pattern light modulation element is disposed, and a second reflection on a surface of the first polarization beam splitter which faces the second and third color lights on the emission side of the second and third color lights. A third polarization beam splitter in which a third reflection type light modulation means is disposed on a surface to which the third color light reaches, and a third polarization beam splitter in which the third color light is transmitted;
Of the polarization beam splitter of the first type,
And a fourth polarizing beam splitter for combining the third color light.

According to a third aspect of the present invention, there is provided the projector apparatus according to the second aspect.
, Color separation / synthesis means are arranged on the incident side of the first polarization beam splitter and on the incidence side and the emission side of the second polarization beam splitter, and rotate the polarization direction of the first color light by 90 degrees. 3 polarization direction rotating means, and fourth and fifth polarization direction rotating means disposed on the incident side and the emission side of the third polarization beam splitter and rotating the polarization direction of the second color light by 90 degrees. Is what it is.

According to a fourth aspect of the present invention, there is provided the projector apparatus of the second aspect.
, The color separation / synthesis means is disposed on the incident side of the first polarization beam splitter and on the emission side of the second polarization beam splitter, and the sixth and seventh polarizations rotate the polarization direction of the first color light by 90 degrees. Direction rotation means, eighth polarization direction rotation means disposed on the incident side of the third polarization beam splitter and rotating the polarization direction of the third color light by 90 degrees, and disposed on the emission side of the third polarization beam splitter And ninth polarization direction rotating means for rotating the polarization direction of the second color light by 90 degrees.

[0025]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, a case will be described in which the present invention is applied to a projection unit of a rear projection type projector device shown in FIG.

FIG. 1 is a sectional view showing a schematic configuration of a rear projection type projector device.

In FIG. 1, reference numeral 1 denotes a housing, on which a projection unit 2 is disposed on the bottom surface, and a reflection mirror 3 is disposed on the rear surface of the housing. Furthermore, a screen 4 for displaying an image is stretched over the front opening of the housing 1.

Then, the image light enlarged and projected from the projection unit 2 is reflected by the reflection mirror 3 and then projected on the screen 4, and the observer observes the image from outside the housing 1. [1] First Embodiment FIG. 2 is a schematic configuration diagram showing a projection unit of a projector device according to an embodiment of the present invention.

As shown in FIG. 1, the projection unit 2 includes a light source unit 110, a color separation / synthesis unit 120, and a projection optical system 16
0.

The light source unit 110 includes an ultra-high pressure mercury lamp 111 serving as a light source and a P / S converter 1 for unifying the polarization direction.
The white light emitted from the ultra-high pressure mercury lamp 111 is selectively converted into S-polarized light by the P / S converter 112 and combined with the S-polarized light component output as it is. And the polarization directions are unified.

The color separation / combination unit 120 reflects and separates an S-polarized component of the incident light beam (transmits and separates a P-polarized component).
The first to fourth polarizing beam splitters (PBS) 121 to 124 having a cubic shape are provided.
The fourth PBSs 121 to 124 are arranged and arranged such that mutually adjacent polarization separation surfaces are orthogonal to each other.

Each of the PBSs 121 to 124 separates a light beam by transmitting a P-polarized component of the incident light beam and reflecting an S-polarized component in a direction of 90 degrees with respect to the incident light beam. .

First main surface P of first PBS 121
1 side (incident surface side on which light flux from light source unit 110 enters)
, A first green component narrow band retarder 131 is disposed. A second green component narrow band phase difference plate 132 is disposed on the first main surface P1 side (the incident surface side on which the light beam from the first PBS 121 is incident) of the second PBS 122, and On the surface P2 side, a green component liquid crystal panel 15
1 is arranged. The second in the third PBS 123
The first red component narrow-band retardation plate 1 is disposed on the main surface P2 side (the incident surface side on which the light beam from the first PBS 121 is incident).
41, a red component liquid crystal panel 152 is disposed on the fourth principal surface P4 side, and a blue component liquid crystal panel 153 is disposed on the first principal surface P1 side. 4th
Of the second principal surface P2 of the PBS 124 (second PB
The third green component narrow band retarder 133 is disposed on the incident surface side on which the light beam from S122 is incident, and the first main surface P
A second red component narrow band phase difference plate 142 is disposed on one side (on the incident surface side where the light beam is incident from the second PBS).

Each of the narrow band retarders 131 to 133, 14
1, 142 rotate the polarization direction of a predetermined wavelength band component of the incident light beam by 90 degrees, that is, convert the P-polarized light to S
It converts S-polarized light to P-polarized light.

Each of the liquid crystal panels 151 to 153 is a reflective liquid crystal panel, and rotates the polarization direction of a light beam incident on a pixel to be displayed by 90 degrees based on image information of a corresponding color component. In addition to being reflected, the light flux incident on the other pixels is reflected as it is. The green liquid crystal panel 151 is supported and fixed by the support frame 151a, and the red component liquid crystal panel 152 is supported by the support frame 1a.
The blue component liquid crystal panel 153 is supported and fixed at 52a, and is supported and fixed to the support frame 153a.

Then, the polarization direction of the S-polarized white light emitted from the light source unit 110 is selectively rotated by 90 degrees by the first green component narrow band phase difference plate 131, that is, the S-polarized white light is S-polarized.
The polarized light is converted into P-polarized light and output to the first PBS 121. The luminous flux output at this time is green light P
The polarized light and the remaining red light and blue light are S-polarized light.

The luminous flux incident on the first PBS 121 is P
The polarized green light is transmitted through the polarization separation surface, and the S-polarized red light and blue light are transmitted through the polarization separation surface in the direction of incidence by 9%.
It is reflected in the direction of 0 degrees. Thus, the white light incident from the light source unit 110 is separated into green light and other red light and blue light.

The green light transmitted and separated by the first PBS 121 is rotated by 90 degrees in the polarization direction by the second green component narrow band wave plate 132, that is, converted from P-polarized light to S-polarized light. Output to the PBS 122.

The green light incident on the second PBS 122 is
Since the light is converted into S-polarized light by the second green component narrow band retardation plate 132, the polarization separation surface has an angle of 90 ° with respect to the incident direction.
The light is reflected in the degree direction and is output toward the green component liquid crystal panel 151.

The green light incident on the green component liquid crystal panel 151 rotates the polarization direction of the light beam incident on the pixel to be displayed in green by 90 degrees based on the image information of the green component input from an image processing device (not shown). , That is, P
The luminous flux converted into polarized light and incident on the other pixels is S
The polarized light is output again to the second PBS 122.

The green light incident on the second PBS 122 is
A P-polarized light beam (green image light) to be displayed in green is transmitted through the polarization splitting surface, and the other S-polarized light beam is reflected by the polarization separating surface in a direction at 90 degrees to the incident direction. As a result, the green image light is output from the second PBS 122 to the third green component narrow band phase difference plate 133, where the polarization direction is rotated by 90 degrees, that is, the polarization direction is converted from P-polarized light to S-polarized light. Is output to the PBS 124.
The light beam reflected by the polarization splitting surface of the second PBS 122 returns to the light source unit 110 as unnecessary light.

On the other hand, the red light and the blue light reflected and separated by the first PBS 121 are selectively rotated by 90 degrees in the polarization direction of the red light by the first red component narrow band wave plate 141.
That is, the s-polarized light is converted to p-polarized light, and the third PBS 1
23 is output. The luminous flux output at this time is
The red light is P-polarized light, and the remaining blue light is S-polarized light.

The luminous flux incident on the third PBS 123 is P
The red light, which is polarized light, passes through the polarization separation surface and is output toward the red component liquid crystal panel 152, and the blue light, which is S-polarized light, is reflected at the polarization separation surface in a direction at 90 degrees to the incident direction, Output to blue component liquid crystal panel 153. Thereby, the light flux reflected and separated by the first PBS 121 is further separated into red light and blue light.

The red light incident on the red component liquid crystal panel 152 rotates the polarization direction of a light beam incident on a pixel to be displayed in red by 90 degrees based on image information of a red component input from an image processing device (not shown). Ie, from P-polarized light to S
The luminous flux converted into polarized light and incident on the other pixels is P
The polarized light is output again to the third PBS 123.

The blue light incident on the blue component liquid crystal panel 153 has a polarization direction of a light beam incident on a pixel to be displayed in blue of 90, based on image information of a blue component input from an image processing device (not shown). The light is rotated by degrees, that is, converted from S-polarized light to P-polarized light, and the luminous flux incident on the other pixels is output to the third PBS 123 again as S-polarized light.

Then, the S-polarized light beam (red image light) to be displayed in red, which is incident on the third PBS 123, is reflected by the polarization splitting surface in a direction at 90 degrees to the incident direction, and is P-polarized light. Other light beams pass through the polarization splitting surface.

Further, a P-polarized light beam (blue image light) to be displayed in blue, which is incident on the third PBS 123, passes through the polarization splitting surface, and the other S-polarized light beams enter the polarization splitting surface at the incident direction. Is reflected in the direction of 90 degrees.

As a result, the red image light and the blue image light are combined on the polarization splitting surface of the third PBS 123 and output to the second red component narrow band phase difference plate 142.

The polarization of the red image light is selectively rotated by 90 degrees, ie, the polarization direction of the red image light is converted from the S-polarized light into the P-polarized light.
The polarization direction of the blue image light remains the P polarization, and the fourth PBS 1
24.

Since the red image light and the blue image light incident on the fourth PBS 124 are P-polarized light, they pass through the polarization splitting surface, and the above-described green image light incident from a direction orthogonal to the polarization separation surface is , S-polarized light, it is reflected on the polarization separation surface in a direction at 90 degrees to the incident direction.

Thus, the combined image light of the red image light and the blue image light and the green image light are combined on the polarization splitting surface of the fourth PBS 124, and the combined color image light is output to the projection lens 160. Is done.

The color image light incident on the projection lens 160 is enlarged and projected at a predetermined magnification toward the screen 4 via the reflection mirror 3 shown in FIG.

As described above, according to the projector of the present embodiment, each of the liquid crystal panels 151 to 153
Are disposed on the first principal plane P1, the second principal plane P2, and the fourth principal plane P4, and the projection lens 160 is disposed on the remaining third principal plane P3. The panels do not interfere. Accordingly, the distance D1 between the projection lens 160 and the fourth PBS 124 from which the image light is output can be reduced to shorten the back focus distance, and the optical conditions required for the projection lens 160 can be reduced. It becomes possible.

The second and third embodiments of the present embodiment
The green component narrow band phase difference plates 132 and 133 may use a λ / 2 phase difference plate because the incident light beam is only green image light. [2] Second Embodiment In the above-described first embodiment, the configuration in which the image light is output in the same direction as the light flux emitted from the light source unit 110 has been described. However, in the present embodiment, Light source unit 1
A configuration in which image light is output in a direction orthogonal to a light beam emitted from 10 will be described. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 3 is a schematic configuration diagram showing a projection unit of the projector device according to the present embodiment.

As shown in the drawing, the projection unit 2 includes a light source section 110, a color separation / combination section 220, and a projection lens 26.
0.

The color separation / combination unit 220 reflects and separates the S-polarized component from the incident light beam (transmits and separates the P-polarized component).
The first to fourth polarizing beam splitters (PBS) 221 to 224 are provided.
The fourth PBSs 221 to 224 are arranged so that the polarization separation surfaces adjacent to each other are orthogonal to each other.

First main surface P of first PBS 221
1 side (incident surface side on which light flux from light source unit 110 enters)
, A λ / 2 phase difference plate 231 and a first green component narrow band phase difference plate 232 are arranged. Second PBS 222
A green component liquid crystal panel 251 is disposed on the first main surface P1 side (the incident surface side on which the light beam from the first PBS 221 is incident). The blue component narrow band phase difference plate 23 is provided on the second principal surface P2 side (the incident surface side on which the light beam from the first PBS 221 is incident) of the third PBS 223.
3, a blue component liquid crystal panel 253 is disposed on the second principal surface P2 side, and a red component liquid crystal panel 252 is disposed on the third principal surface P3 side. 4th PB
In S224, the second green component narrow band retarder 235 is disposed on the first principal surface P1 side, and the red component narrow band retarder 234 is disposed on the second principal surface P2 side. .

The λ / 2 retardation plate 231 rotates the polarization direction of the incident light beam by 90 degrees, that is, converts the P-polarized light to the S-polarized light.
S-polarized light is converted to P-polarized light, and each of the narrow band retarders 232 to 235 rotates the polarization direction of a predetermined wavelength band component of the incident light beam by 90 degrees, that is, converts P-polarized light to S-polarized light. In addition, S-polarized light is converted to P-polarized light.

Each of the liquid crystal panels 251 to 253 is a reflection type liquid crystal panel, and rotates the polarization direction of the light beam incident on the pixel to be displayed by 90 degrees based on the image information of the corresponding color component to reflect the light. In addition, the light flux incident on the other pixels is reflected in the same polarization direction.

Then, the S-polarized white light emitted from the light source unit 110 is converted into P-polarized light by the λ / 2 phase difference plate 231, and then selectively converted by the first green component narrow band phase difference plate 231. The green light is converted to S-polarized light, and the first PBS 22
1 is output.

The luminous flux incident on the first PBS 221 is P
The red light and blue light that are polarized light are transmitted, and the green light that is s-polarized light is reflected by the polarization separation surface in a direction at 90 degrees to the incident direction. Thus, the white light incident from the light source unit 110 is separated into green light and other red light and blue light.

The green light transmitted and separated by the first PBS 221 is output to the second PBS 222.

The green light incident on the second PBS 222 is
The light is reflected by the polarization separation surface in a direction at 90 degrees to the incident direction, and is output toward the green liquid crystal panel 251.

The green light incident on the green liquid crystal panel 251 changes the polarization direction of the light flux incident on the pixel to be displayed in green from S-polarized light to P based on image information of a green component input from an image processing device (not shown). The light is converted into polarized light and output again to the second PBS 222.

The green light incident on the second PBS 222 is
A P-polarized light beam (green image light) to be displayed in green passes through the polarization splitting surface and is output to the second green component narrow band retarder 235.

The green image light incident on the second green component narrow band phase difference plate 235 is converted from P-polarized light to S-polarized light,
Is output to the PBS 224.

On the other hand, the red light and the blue light reflected and separated by the first PBS 221 are transmitted to the blue component narrow band retarder 23.
At 3, blue light is selectively converted from P-polarized light to S-polarized light,
Output to the second PBS 223.

The luminous flux incident on the third PBS 223 is P
The red light, which is polarized light, passes through the polarization splitting surface and is output toward the red component liquid crystal panel 252, and the blue light, which is S-polarized light, is reflected by the polarization splitting surface at a direction of 90 degrees with respect to the incident direction, Output to blue component liquid crystal panel 253. Thereby, the light beam reflected and separated by the first PBS 221 is further separated into red light and blue light. The red light incident on the red component liquid crystal panel 252 is a red light input from an image processing device (not shown). Based on the image information of the component, the light beam incident on the pixel to be displayed in red is selectively converted from P-polarized light to S-polarized light, and the light beam incident on the other pixels remains P-polarized light, PBS223
Output to.

The blue light incident on the blue component liquid crystal panel 253 has a polarization direction of a light flux incident on a pixel to be displayed in blue based on the blue component image information input from an image processing device (not shown). The luminous flux converted from the polarized light into the P-polarized light and incident on the other pixels is output to the third PBS 223 again as the S-polarized light.

Then, the s-polarized light beam (red image light) to be displayed in red, which has entered the third PBS 223, is reflected by the polarization splitting surface in a direction at 90 degrees to the incident direction, and should be displayed in blue. The P-polarized light beam (blue image light) transmits through the polarization splitting surface, whereby the red image light and the blue image light are combined on the polarization splitting surface of the third PBS 223, and the red component narrow band phase difference plate 234 Output to.

In the composite image light incident on the red component narrow band retarder 234, the polarization direction of the red image light is selectively converted from S polarization to P polarization, and the polarization direction of the blue image light remains P polarization. , To the fourth PBS 224.

Since the red image light and the blue image light incident on the fourth PBS 224 are P-polarized light, they pass through the polarization splitting surface, and the above-described green image light incident from a direction orthogonal thereto is , S-polarized light, it is reflected on the polarization separation surface in a direction at 90 degrees to the incident direction.

Thus, the combined image light of the red image light and the blue image light and the green image light are combined on the polarization splitting surface of the fourth PBS 224, and the combined color image light is output to the projection lens 260. Is done. That is, the light source unit 11
The image light is output in a direction orthogonal to the light beam emitted from 0.

The color image light incident on the projection lens 260 is enlarged and projected at a predetermined magnification toward the screen 4 via the reflection mirror 3 shown in FIG.

According to the projector of the present embodiment described above, each of the liquid crystal panels 251 to 253 is connected to the first to fifth liquid crystal panels.
Arranged on the third main surfaces P1 to P3, and the remaining fourth main surface P4
Since the projection lens 260 is arranged on the liquid crystal panel, the projection lens 260 does not interfere with the liquid crystal panel even when the size of the liquid crystal panel is reduced and the definition is increased.
Accordingly, the distance D1 between the projection lens 260 and the fourth PBS 224 from which the image light is output can be reduced to shorten the back focus distance, and the optical conditions required for the projection lens 260 can be reduced. It becomes possible.

Note that the second green component narrow band phase difference plate 235 in the present embodiment may use a λ / 2 phase difference plate because the incident light beam is only green image light.

The λ / 2 phase difference plate 231 and the first green component narrow band phase difference plate 232 in this embodiment are:
A narrow-band retarder that selectively rotates the polarization directions of red light and blue light by 90 degrees may be used.

In each of the above embodiments,
The case where the present invention is applied to the projection unit 2 of the rear projection type projector device has been described, but the same effect can be obtained even when used in a front type projector device.

[0080]

According to the present invention, the interference between the liquid crystal panel or its supporting frame and the projection lens can be eliminated, thereby alleviating the optical conditions required for the projection lens, and reducing the size and the size of the projection lens. It is possible to provide a projector device.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a rear projection type projector device.

FIG. 2 is a configuration diagram illustrating a schematic configuration of a projection unit mounted on the rear projection type projector device of FIG. 1 in the first embodiment.

FIG. 3 is a configuration diagram illustrating a schematic configuration of a projection unit mounted on the rear projection type projector device of FIG. 1 in a second embodiment.

FIG. 4 is a schematic configuration diagram illustrating a configuration of a conventional projector device.

[Explanation of symbols]

 110: light source unit 111: ultra-high pressure mercury lamp 112: P / S converter 120: color separation / synthesis unit 121: first polarization beam splitter (PBS) 122: second polarization beam splitter (PBS) 123: third polarization Beam splitter (PBS) 124: Fourth polarization beam splitter (PBS) 131: First green component narrow band retarder 132: Second green component narrow band retarder 133: Third green component narrow band Phase difference plate 141: first red component narrow band phase difference plate 142: second red component narrow band phase difference plate 151: green component liquid crystal panel 151a: support frame 152: red component liquid crystal panel 152a: support frame 153: blue component Liquid crystal panel 153a: Support frame 160: Projection lens

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H088 EA12 HA20 HA28 MA20 2H091 FA10X FA14Z FA41Z LA30 MA07

Claims (4)

[Claims] 1. A light separating means separates light emitted from a light source means into first to third color lights by a color separation / synthesis means, and separates the separated first to third color lights into corresponding reflection type light modulation means. A projector device that optically modulates and modulates each of the color lights by color separation / synthesis / separation means and projects the enlarged image light by a projection optical system, wherein the color separation / synthesis means are orthogonal to each other. A polarization separation unit having a polarization separation surface, wherein the first to third reflection-type light modulation units are arranged on three main surfaces of the four main surfaces of the polarization separation unit, and the projection optical system is provided on the remaining one main surface. A projector device comprising a system. 2. The polarized light separating means separates light emitted from the light source means into a first color light and second and third color lights having different polarization directions, and emits the lights in directions orthogonal to each other. A first polarization beam splitter, and a first polarization beam splitter in which a first reflection type light modulation element is disposed on a surface of the first polarization beam splitter that faces the first color light and to which the first color light reaches. Two polarizing beam splitters and the first
And a second reflection type light modulating unit is disposed on a surface to which the second color light reaches, and a second reflection type light modulation unit is disposed on a surface to which the third color light reaches. A third polarization beam splitter in which three reflection type light modulating means are disposed, and an output side of the second polarization beam splitter and an output side of the third polarization beam splitter. A fourth polarization beam splitter that combines the three color lights. 3. The color separation / combination means is disposed on the incident side of the first polarizing beam splitter and on the incident side and the emitting side of the second polarizing beam splitter, and changes the polarization direction of the first color light by 90 degrees. First to third polarization direction rotating means for rotating, and fourth and fifth polarizations disposed on the incident side and the emission side of the third polarization beam splitter and for rotating the polarization direction of the second color light by 90 degrees. 3. The projector according to claim 2, further comprising a direction rotating unit. 4. The color separation / combination means, which is disposed on the incident side of the first polarization beam splitter and the emission side of the second polarization beam splitter, and rotates the polarization direction of the first color light by 90 degrees. Sixth and seventh polarization direction rotating means;
Disposed on the incident side of the third polarizing beam splitter,
Eighth polarization direction rotating means for rotating the polarization direction of the third color light by 90 degrees, and ninth means for rotating the polarization direction of the second color light by 90 degrees, which is disposed on the emission side of the third polarization beam splitter. 3. The projector according to claim 2, further comprising a polarization direction rotating unit.