JP2001228534A - Projection type display device and method for adjusting contrast - Google Patents

Projection type display device and method for adjusting contrast

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Publication number
JP2001228534A
JP2001228534A JP2000039723A JP2000039723A JP2001228534A JP 2001228534 A JP2001228534 A JP 2001228534A JP 2000039723 A JP2000039723 A JP 2000039723A JP 2000039723 A JP2000039723 A JP 2000039723A JP 2001228534 A JP2001228534 A JP 2001228534A
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JP
Japan
Prior art keywords
light
phase plate
quarter
member
light valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2000039723A
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Japanese (ja)
Inventor
Koichiro Ishii
Hisao Ozeki
尚夫 大関
浩一郎 石井
Original Assignee
Nikon Corp
株式会社ニコン
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Application filed by Nikon Corp, 株式会社ニコン filed Critical Nikon Corp
Priority to JP2000039723A priority Critical patent/JP2001228534A/en
Publication of JP2001228534A publication Critical patent/JP2001228534A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To obtain projected picture whose contrast is excellent. SOLUTION: Relating to a projection type display device having a light source, a color resolving optical system, a polarizing beam splitter arranged for each color light beam, a reflection type light valve, a polarizing beam splitter for each color light beam and a 1/4 wavelength phase plate, a color synthetic optical system and a projection lens, a 1/4 wavelength phase plate holder possesses a projected part having a screw part, and a cover member possesses a circular-arc hole, and the projected part of the 1/4 wavelength phase plate holder to which the 1/4 wavelength phase plate is attached is projected together with the 1/4 wavelength phase plate from the aperture part of the cover member to the outside of the cover member, and the cover member is screwed and fixed by a screw by passing the screw part of the projected part through the circular-arc hole of the cover member at the holder member, and a constitution obtained by integrating the light valve, the 1/4 wavelength phase plate and the polarizing beam splitter is obtained by attaching a first attaching member attached to the polarizing beam splitter, the 1/4 wavelength phase plate and a light shielding plate in the integrating member of the light valve.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarization type light valve which modulates, reflects and emits each color light incident on a reflection type light valve arranged for each of R, G and B light, and arranges each of the color lights. The present invention relates to a projection display device having a configuration in which modulated light is detected and taken out by a beam splitter, and the respective color modulated lights are color-combined by a color combining prism and enlarged and projected by a projection lens.

[0002]

2. Description of the Related Art Each color light incident on a reflection type light valve arranged for each of R, G, B light is modulated by the light valve, reflected and emitted, and modulated by a polarization beam splitter arranged for each color light. FIG. 13 of Japanese Patent Publication No. 2599309 discloses a projection type display device having a configuration in which light is detected and extracted, and the respective color-modulated lights are color-combined by a color-combining prism and enlarged and projected by a projection lens. It has been known. This configuration diagram is shown in FIG. 8 and will be described as a conventional example.

Light emitted from a light source 61 is reflected by a B light reflecting dichroic mirror 62 disposed substantially in parallel on the optical axis.
And a G light reflecting dichroic mirror 63, and is incident on a color separation optical system, where the light is separated into R (red) light, G (green) light and B (blue) light. The B light travels while changing the optical axis at a right angle by the bending mirror, and is incident on the B light polarizing beam splitter 64B. The G light and the R light are incident on the arranged polarization beam splitters 64G and 64R, respectively. The light that has entered the polarization beam splitters for each color is subjected to a polarization separation operation by the polarization separation unit of each polarization beam splitter, and is separated into S-polarized light of each color reflected and emitted and P-polarized light of each color transmitted and discarded. .

[0004] The S-polarized light of each color is reflected by the reflective light valves 65R, 65G, and 65 for each color light arranged near the exit surface.
B is reflected by a color signal of each color light, reflected, emitted, and then re-enters the polarization beam splitter for each color light, transmits the modulated light (P-polarized light), and detects and extracts the light. The analysis light of each color light enters the cross dichroic prism 66 constituting the color combining optical system, and the combined light enters the projection lens 67 and is projected as a full-color image on a screen (not shown).

Conventionally, in a projection display device having such a configuration, each of the constituent members described above is disposed in a housing member constituting the appearance of the projection display device, and a part of the housing is provided. Have been arranged on the respective boards constituting the floor members. The above-described full-color projection display device has a problem that the contrast of a projected image does not increase and a problem that a so-called registration shift occurs in which a pixel of a full-color image on a screen shifts due to a change in environmental temperature or the like.

A method described in Japanese Patent Publication No. 7-38050 is known as a method for improving contrast in a projection type display device using a polarizing beam splitter and a reflection type light valve. The configuration diagram described in FIG. 1 is described in FIG. 9 and will be described. The light source light emitted from the light source 21 enters the polarization beam splitter 22 at the optical axis 30,
The S-polarized light reflected by the polarization splitter exits the polarization beam splitter, and enters the reflection type light valve 26 via a quarter-wave phase plate arranged on the optical axis. Note that the fast axis 25 of the wave plate is parallel to the optical axis 30.
The slow axis 28 is arranged perpendicular to the fast axis 29. The light reflected by the reflection type light valve and traveling backward in the same optical axis as the incident optical axis enters the polarization beam splitter via the quarter-wave phase plate 28, and transmits only the modulated light (P-polarized light) ( (Analysis) and projected by the projection lens 27.

The reason why the contrast is improved is described in detail in the above-mentioned publication, and the description thereof is omitted here. In the projection display device described in the conventional example, in order to adopt the above-described method, since the light valves for the R, G, and B lights are respectively disposed for the respective light valves, the light valve for each color light and the polarization What is necessary is just to arrange | position the said 1/4 wavelength phase plate between beam splitters, respectively.

[0008]

However, in the projection type display device having the configuration described in the conventional example, the projection display device has the above configuration to improve the contrast of the projected image.
When the wavelength phase plate was attached to the incident surface (same as the exit surface) from the light valve and the contrast improvement was observed, the effect varied. The present inventor has studied the problem of the variation and found that the cause of the problem is variation in the direction of the optical axes (the fast axis and the slow axis) of the quarter-wave phase plate. . In other words, the quarter-wave phase plate usually has a notch in the external shape so that the direction of the optical axis can be seen from the external appearance, but there is an error in the appearance formation only from the external appearance. In addition, errors in assembling the optical system were added, and cumulative errors occurred in the direction of the arranged optical axis, and the position of the optical axis could not be determined accurately depending on the shape. .

Then, when an experiment was performed in which the projected image was observed by rotating the quarter-phase plate around the optical axis, the contrast changed according to the rotation, and the place where the contrast of the projected image was optimum was found. It has been found that if the wavelength phase plate is fixedly held at this position, an apparatus having the best contrast of the present invention can be provided.

[0010]

Accordingly, the present invention firstly provides a light source, a color separation optical system for separating R (red) light, G (green) light and B (blue) light, and each color light. A polarizing beam splitter arranged for each color, a reflective light valve arranged for each color light, a quarter-wave phase plate arranged between the polarization beam splitter for each color light and the light valve for each color light, In a projection type display device having a color combining optical system and a projection lens, the light valve, the quarter-wave phase plate, and the polarization beam splitter are integrated, and the integration is performed by attaching a light beam to the polarization beam splitter. (1) The mounting is performed by attaching an integrated member and a member in which the quarter-wave phase plate and the light valve are integrated, and an integrated member that integrates the quarter-wave phase plate and the light valve includes a cover. And the member, and a 1/4 wave plate holders, secured to 該記 quarter wave plate holder 1/4
A wavelength phase plate, a light shielding plate, the light valve, and a back plate to which the light valve is fixed; the quarter-wave phase plate holder having a protrusion having a screw portion; Has an arc-shaped hole, and the 1/4 wavelength phase plate holder, to which the 1/4 wavelength phase plate is attached, is provided with a 1/4 wavelength phase plate and a projection from the opening of the cover member in the cover member. The cover member is projected out of the cover member, the holder member is screwed and fixed to the cover member with a screw through a projection screw portion and an arc-shaped hole of the cover member, and the light valve, the quarter-wave phase plate, The configuration in which the polarization beam splitter is integrated includes a first attachment member attached to the polarization beam splitter,
A projection type display device (Claim 1), wherein a wavelength phase plate and the light shielding plate in an integrated member of the light valve are attached. Second, "light source, polarizing beam splitter, R (red) light, G (green) light and B
(Blue) a color separation / synthesis optical system composed of a plurality of prisms which also serves as a color separation optical system for separating light into light and a synthesis optical system for color-synthesizing the respective color lights, and a reflection type light valve arranged for each color light. A projection type display device having a 波長 wavelength phase plate disposed between the color separation / synthesis prism and each color light light valve, and a projection type display device having a projection lens; The prism is integrated, and the integration is performed by attaching a first light valve attachment member attached to the prism and a member obtained by integrating the 1/4 wavelength phase plate, thereby obtaining the 1/4 wavelength phase plate. And a light valve integrated member, a cover member, a 波長 wavelength plate holder, a 波長 wavelength phase plate fixed to the 1 / wavelength plate holder, a light shielding plate,
A light valve, comprising a back plate to which the light valve is fixed, wherein the quarter-wave phase plate holder has a projection with a screw portion, the cover member has an arc-shaped hole, The quarter-wave phase plate holder with the quarter-wave phase plate attached thereto has a configuration in which a projection projects out of the cover member through the opening of the cover member into the cover member together with the quarter-wave phase plate. The cover member is screwed and fixed to the cover member with screws through the protrusion screw portion and the arc-shaped hole of the cover member, and the light valve, the quarter-wave phase plate, and the polarization beam splitter are disposed. The integration is performed by attaching a first attachment member attached to the polarizing beam splitter, the 遮光 wavelength phase plate, and the light shielding plate in an integrated member of the light valve. Morphism display device provides (claim 2) ". Third, "the light source, the polarizing beam splitter, and R
A color separation / synthesis optical system composed of a plurality of prisms which also serves as a color separation optical system for separating (red) light, G (green) light and B (blue) light into light, and a synthesis optical system for color combining the respective color lights. A reflection type light valve disposed for each color light, a 波長 wavelength phase plate disposed between the color separation / combination prism and the light valve for each color light, and a projection display device having a projection lens, A light valve, a 1/4 wavelength phase plate and the plurality of prisms are integrated, and the integration is performed by integrating a first light valve mounting member attached to the prism and a member integrating the 1/4 wavelength phase plate. The integrated member of the 1/4 wavelength phase plate and the light valve is provided with a cover member, a 1/4 wavelength phase plate holder, and a 1/4 wavelength plate fixed to the 1/4 wavelength plate holder.
A four-wavelength phase plate, a light-shielding plate, a light valve, and a back plate to which the light valve is fixed; the quarter-wave phase plate holder having a protrusion having a screw portion; Has an arc-shaped hole, and the quarter-wave phase plate holder to which the quarter-wave phase plate is attached, together with the quarter-wave phase plate, has a projection formed in the cover member from an opening of the cover member. Is disposed in a configuration protruding out of the cover member. The cover member is screwed and fixed to the holder member through a protrusion screw portion and an arc-shaped hole of the cover member. The integration of the quarter-wave phase plate and the polarizing beam splitter includes a first mounting member attached to the polarizing beam splitter, and the cover member in the integrated member of the quarter-wave phase plate and the light valve. Mounting to provide a projection type display apparatus (claim 3), "which is characterized in that it. Fourthly, "the quarter-wave phase plate holder and the cover member are arranged such that a screw fitted into an arc hole of the cover portion is screwed along the hole portion before screwing the holder member to a thread portion at the tip end. 4. The method of claim 1, wherein the て wavelength phase plate is rotated to adjust the contrast of the projected image. Fifth, a “light source, a color separation optical system that separates R (red) light, G (green) light, and B (blue) light, and a polarization beam splitter disposed for each color light are provided. A reflective light valve disposed for each color light, a quarter-wave phase plate disposed between the polarization beam splitter for each color light and the light valve for each color light, a color combining optical system, and a projection lens In the projection type display device having And Lube the quarter wave plate and the polarization beam splitter are integrated, the integral is the first light valve mounting member attached to the light valve 1
This is performed by attaching a member having a / wavelength phase plate integrated therein, and the integrated member for integrating the 1 / wavelength phase plate and the light valve includes a cover member, a 波長 wavelength phase plate holder, A quarter-wave phase plate fixed to the quarter-wave plate holder, a light shielding plate, the light valve, and a back plate to which the light valve is fixed;
The quarter-wave phase plate holder has a projection with a tip bent, the light shielding member has an arc-shaped hole, and the quarter-wave phase plate holder to which the quarter-wave phase plate is attached is: The 1 / wavelength phase plate and the cover member have a configuration in which a projection is projected from the opening of the cover member to the outside of the cover member through the opening of the cover member. The light valve, the 波長 wavelength phase plate, and the polarization beam splitter are integrated into the arc-shaped hole, and the first attachment member attached to the polarization beam splitter includes: A projection type display device (Claim 5) comprising a four-wavelength phase plate and the light shielding plate in an integrated member of the light valve. Sixth, "light source, polarizing beam splitter, R (red) light and G (green) light"
A color separation / synthesis optical system composed of a plurality of prisms which also serves as a color separation optical system for separating light into light and B (blue) light and a synthesis optical system for color-synthesizing the respective color lights, and a reflection type arranged for each of the color lights A light valve, a quarter-wave phase plate disposed between the color separation / synthesis prism and the light valve for each color light,
In a projection type display device having a projection lens, the light valve, the quarter-wave phase plate and the plurality of prisms are integrated, and the integration is performed by a first light valve mounting member mounted on the prism and the first light valve mounting member. It is performed by attaching a member that integrates a 1/4 wavelength phase plate,
The integrated member of the 1/4 wavelength phase plate and the light valve,
A cover member, a quarter-wave phase plate holder,
The 1/4 wavelength phase plate holder includes a four-wavelength plate, a light-shielding member, the light valve, and a back plate. And the quarter-wave phase plate holder to which the quarter-wave phase plate is attached, together with the quarter-wave phase plate, causes a projection to protrude outside the cover member from an opening in the cover member, The tip bending member of the protrusion is inserted into the arc-shaped hole, and the light valve is integrated with the quarter-wave phase plate and the polarizing beam splitter by a first mounting member mounted on the polarizing beam splitter. When,
A projection type display device (Claim 6), wherein the 1 / wavelength phase plate and the light blocking member in the integrated member of the light valve are attached. Seventhly, "before inserting the bent end of the projection of the quarter-wave plate holder member into the arc-shaped hole of the light-shielding member, move it along the arc-shaped hole to move the quarter-wave phase. A method for adjusting the contrast of a projected image of a projection display device according to claim 6, wherein the plate is rotated to adjust the contrast of the projected image (claim 7). Eighth, “a light source, a color separation optical system that separates R (red) light, G (green) light, and B (blue) light, a polarizing beam splitter disposed for each color light, A reflective light valve disposed, a quarter-wave phase plate disposed between the polarization beam splitter for each color light and the light valve for each color light,
In a projection display apparatus having a color combining optical system and a projection lens, the light valve, the quarter-wave phase plate, and the polarization beam splitter are integrated, and the integration is performed by a first light attached to the light valve. This is performed by attaching a valve mounting member and a member obtained by integrating the quarter-wave phase plate, and the integrated member integrating the quarter-wave phase plate and the light valve includes a cover member and a light valve.
A quarter-wave phase plate holder, a quarter-wave phase plate and a light shielding plate fixed to the quarter-wave plate holder, the light valve, and a back plate to which the light valve is fixed; The four-wavelength phase plate holder has a protrusion with a bent front end, and the bent front end of the protrusion projects through a hole formed in the light-blocking member to the back of the light-blocking member. , The first light valve (claim 8). " Ninth, “light source, polarizing beam splitter, R (red) light, G (green) light and B
(Blue) a color separation / synthesis optical system composed of a plurality of prisms which also serves as a color separation optical system for separating light into light and a synthesis optical system for color-synthesizing the respective color lights, and a reflection type light valve arranged for each color light. A projection type display device having a 波長 wavelength phase plate disposed between the color separation / synthesis prism and each color light light valve, and a projection type display device having a projection lens; The prism is integrated, and the integration is performed by attaching a first light valve attachment member attached to the prism and a member obtained by integrating the 1/4 wavelength phase plate, thereby obtaining the 1/4 wavelength phase plate. The integrated member of the light valve and the light valve includes a cover member, a quarter-wave phase plate holder, the quarter-wave plate, a light shielding member, the light valve, and a back plate. 4 waves The phase plate holder has a protruding portion having a bent front end portion, and the light shielding member is protruded to the back of the light shielding portion through a hole formed in the light shielding member, and the light shielding member is the first light. A projection type display device (claim 9), which also serves as an attachment member for the valve attachment member. Tenthly, “using the projection type display device according to claim 8 or 9,
In the method of adjusting the contrast of the projected image by rotating the four-wavelength phase plate around the optical axis, the tip of the quarter-wave phase holder protruding from the back of the light shielding member is arranged along the hole. A method (claim 10) for adjusting the contrast of the projected image by rotating the quarter-wave phase plate by moving it is provided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment of Projection Display Device) The configuration of a projection display device according to a first embodiment of the present invention will be described. FIG. 4 shows a schematic diagram of the basic configuration. The configuration will be described. Lamp 1
a and a dichroic mirror 2RG having R (red) light and G (green) light reflection characteristics, the light having a substantially parallel light flux emitted from the light source 1 composed of a concave mirror 1b having a parabolic shape. A dichroic mirror 2B having a B (blue) light reflection dichroic characteristic is incident on a cross dichroic mirror 2 arranged orthogonally to each other. The incident light is color-separated into B light traveling in a direction orthogonal to the incident optical axis and a mixed light of R light and G light in directions opposite to each other.

The B light travels by changing the traveling direction to a right angle by the bending mirror 5, and the polarization beam splitter 6 for the B light
B is incident. On the other hand, the mixed light of the R light and the G light travels by changing the traveling direction by the bending mirror 4 and is incident on a dichroic mirror 3G having a G light reflection characteristic.
The light is reflected by the mirror and color-separated into G light traveling in a changed traveling direction and R light traveling as it is.

As described above, the dichroic mirror 2R
The G, the mirror 2B, the mirror 3G, and the bending mirrors 4 and 5 constitute a color separation optical system that separates the light source light into R light, G light, and B light. The R light and the G light are incident on the polarization beam splitter 6R and the polarization beam splitter 6G, respectively.

A so-called fly-eye integrator having a second lens plate similar to the first lens plate having a plurality of lenses arranged in a plane in an optical path between the light source 1 and the cross dichroic mirror 2 and this integrator A plurality of polarizing beam splitters arranged on the exit surface of the polarizing beam splitter array formed in an array, and a half-wave phase plate disposed on the emitting surface of a predetermined polarizing beam splitter of the polarizing beam splitter array. By arranging a polarized light illuminating device, the configuration may be such that light from the light source is converted into single polarized light (S-polarized light in the present embodiment) and is incident on the polarization beam splitter 2. At that time, most of the incident light is S-polarized light, and some P-polarized light is mixed. The P-polarized light is discarded as unnecessary light by the polarization beam splitter for each color light. By employing this polarizer, most of the light from the light source is converted into a single polarized light (S-polarized light in the present embodiment), so that a high-brightness illumination to the light valve for each color becomes possible.

The polarization beam splitters 6B, 6G for each color,
The B light, the G light, and the R light incident on the 6R are respectively subjected to the polarization splitting action by the polarization splitters of the respective polarizing beam splitters, and the S polarized light that reflects the polarized light splitters and the P polarized light that is transmitted and discarded. Undergoes a polarization splitting action. The S-polarized light of each color reflected by the polarization beam splitter for each color is 1 /
After passing through the four-wavelength phase plates 9B, 9G, and 9R, the light enters the reflective liquid crystal light valves 7B, 7G, and 7R for the respective colors arranged near the exit surfaces of the respective polarization beam splitters. The light reflected and emitted by the light valve for each color after being modulated by the color signal of each color is again incident on the polarization beam splitter for each color, and only the modulated light is taken out as P-polarized light passing through the polarization separation unit (detection of the light). ), Each color light is incident on the cross dichroic prism 8 constituting the color combining optical system from a different incident surface.

The quarter-wave phase plates 9B, 9G, 9R
Requires that the optical axis (advance axis) be perpendicular to the optical axis in FIG. 4 and be arranged parallel or perpendicular to the paper surface. This is because the polarization direction of the light beam that is inclined with respect to the optical axis with respect to the light valve is converted into the vibration direction that is optimal for the polarization beam splitter of the polarization beam splitter for each color light that provides the light analysis function.

As described above, the polarization beam splitters 6R, 6G, and 6B arranged for each color light have a function of using the polarization separation optical system and the analysis optical system for each color light.
The cross dichroic prism 8 is a composite prism having a configuration in which an R light reflecting dichroic 8R and a B light reflecting dichroic film 8B are orthogonal to each other. 8B, the incident G light passes through both films and proceeds as it is to achieve color synthesis, exits the prism, enters the projection lens 10 and is projected as a full-color image with good contrast on a screen (not shown). You.

In the configuration of the projection type display device according to the present embodiment, all of the modulated light out of the light emitted from the light valves of each color is P-polarized light, and all the P-polarized light enters the cross dichroic prism 8. However, it is not always necessary to use P-polarized light, and R light and B light may be incident as S-polarized light. In that case, it becomes possible by arranging a half-wave phase plate in the optical path between the polarizing beam splitter and the cross dichroic prism to convert the analysis light into S-polarized light.
(Second Embodiment of Projection Display Device) A basic configuration of a projection display device according to a second embodiment of the present invention will be described. FIG. 6 is an explanatory diagram showing a basic configuration of the projection type display device, and has a configuration different from the configuration of the projection type display device of the first embodiment.

A substantially parallel light beam emitted from a light source 11 composed of a lamp 11a and a parabolic mirror 11b is converted into a polarization beam splitter 1 constituting a polarization separation optical system.
2 and is reflected by the polarization separation unit 12p.
The light is separated into polarized light and transmitted P-polarized light. P
The polarized light is discarded as unnecessary light. Note that, similarly to the first embodiment, a so-called second lens plate similar to the first lens plate in which a plurality of lenses are arranged in a plane in the optical path between the light source 11 and the polarizing beam splitter 12 is provided. A fly-eye integrator and a polarization beam splitter array formed by arraying a plurality of polarization beam splitters disposed on the exit surface of the integrator, and a 1/2 wavelength phase disposed on the exit surface of a predetermined polarization beam splitter of the polarization beam splitter array By arranging a polarized light illuminating device composed of a plate and a plate, the light source light may be converted into a single polarized light (S-polarized light in the present embodiment) and incident on the polarization beam splitter 12. At that time, most of the incident light is S-polarized light, and some P-polarized light is mixed,
The P-polarized light is discarded as unnecessary light.

The S-polarized light reflected and emitted by the polarization beam splitter 12 enters the color separation / synthesis composite prism composed of the prism 13, the prism 14, and the prism 15 from the entrance surface 13a of the prism 13 via a gap. The prism 13, which constitutes the color separation / synthesis composite prism,
Reference numerals 14 and 15 are substantially triangular prism-shaped prisms. Prism 13 constituting color separation / synthesis composite prism
S-polarized light incident from the surface 13a of FIG.
The B light is reflected by the dichroic film having the B light reflection, R, and G light transmission characteristics formed on the b surface, and the R and G lights pass through as it is. The B light travels through the prism 13 and undergoes a total reflection on the surface 13a to further travel, and
It is emitted from the 3c plane.

R emitted from the 13b surface of the prism 13,
The G light is applied to the prism 14 that is disposed with the air gap therebetween.
Incident from the surface. The prism 14 and the prism 15 are triangular prisms having substantially the same shape.
The surface and the 15a surface of the prism 15 are bonded and integrated in a configuration in which a dichroic film having R light reflection and G light transmission characteristics is sandwiched. In the present embodiment, a configuration is adopted in which the dichroic film is formed on the surface 14b, and the film and the surface 15a are bonded and integrated with an adhesive. The prism 14 and the prism 15 do not necessarily have to have the same shape.

The R and G light incident on the prism 14 from the surface 14a via the air gap travels as it is, and the R light is reflected by the dichroic film formed on the surface 14b, and the G light is transmitted and the prism 15 is transmitted to the prism 15a surface. Incident from The R light travels as it is, undergoes total reflection on the surface 14a, further travels, and is emitted from the surface 14c. The G light travels through the prism 15, undergoes total reflection on the surface 15b, further travels, and is emitted from the surface 15c.

B emitted from the 13c surface of the prism 13
The light, the R light emitted from the 14c surface of the prism 14 and the G light emitted from the 15c surface of the prism 15 are each a quarter-wave phase plate 18B disposed near the emission surface.
After passing through 18R and 18G, reflection type light valves 16B and 16
R and 16G are incident as illumination light. The light incident on the light valve for each color light undergoes a modulating action based on the color signal for each color, and is reflected and emitted as a mixed light of P-polarized light corresponding to the modulated light and S-polarized light corresponding to the unmodulated light. You.

The light reflected and emitted from each light valve travels in the direction opposite to the incident optical axis, passes through each quarter-wave phase plate, and passes through the 13c surface of the prism 13 and the prism 14 respectively.
14c surface, 15c surface of the prism 15, incident from the 13a surface of the prism 3, emitted as color synthesized light, incident on the polarization beam splitter 12, and P-polarized light, which is modulated light by the polarization separation unit 12p, as transmitted light, and unmodulated light The S-polarized light is separated (that is, analyzed) as reflected light, enters the projection lens 17, and is projected as a full-color image on a screen (not shown). The S-polarized light corresponding to the non-polarized light reflected by the polarization beam splitter 12p of the polarization beam splitter travels toward the light source as unnecessary light and is discarded.

The quarter-wave phase plate 18B, 1
The directions of the optical axes of 8R and 18G are different from the previous embodiment in the arrangement direction. In the projection display device of the present embodiment, each color light component of the linearly polarized light (S-polarized light in the embodiment), which is the light source light and is polarization-separated by the polarization beam splitter, is singular or Interacts with multiple dichroic films and total reflection films. At this time, it is known that the polarization state changes, and the light is made to be elliptically polarized light which oscillates the optical axis parallel or perpendicular to the paper on the light valve. By doing so, each color light reflected by the light valve interacts with the total reflection film and the dichroic film by proceeding in the opposite direction,
An optimum polarization state for polarization separation (analysis) can be formed in the polarization separation section of the polarization beam splitter 12. As described above, it is originally desirable to achieve the above-described polarization compensation with the dichroic film and the total reflection film for each color light, but there are cases where it is difficult to design, and in the production of the film, variation in the polarization state occurs. Or In the embodiment of the present invention, 1/4
A wavelength phase plate is arranged, and the wavelength phase plate is rotated around the optical axis to assist the polarization compensation by the dichroic film and the total reflection film, and is incident on the light valve in an ideal polarization state. Then, the incident light is reflected to be incident as polarized light having an optimal vibration direction for polarization separation (analysis) by the polarization separation unit 12p of the polarization beam splitter 12 via the total reflection film and the dichroic film. Make it possible.

That is, the direction of the optical axis of the 1/4 wavelength phase plate for each color light is not the same compensation for each color light, and the dichroic film and the total reflection film which pass through each color light are different from each other. Therefore, the amount to be assisted is different, and the amount of rotation (position of the optical axis) is different. In order to secure the above-mentioned polarization compensation, the polarization beam splitter 12 and the prism 1 are also required.
It is desirable to use a material having a small absolute value of the photoelastic constant (a value of 1.5 × 10 −8 cm 2 / N or less) for the transparent optical glass members constituting 3 to 15. This is because the polarization state of light passing through the glass member is not changed. (Third Embodiment) FIG. 1 is a partial exploded view of a configuration diagram showing a third embodiment of the present invention.

The configuration of the projection display device employed in this embodiment is that of the projection display device shown in FIG. Since the light source and the color separation optical system in the configuration diagram shown in FIG. 4 are not related to the gist of the present invention, their illustration and description are omitted because they are already formed in FIG. In the present embodiment, in the configuration of the projection display device described in the first embodiment of the projection display device of FIG. 4, the light valves 7R, 7G, 7
B, the polarizing beam splitters 6R, 6G, 6B, the cross dichroic prism 8, and the projection lens 10 are integrated using a mount member 101.

First, the projection lens 10 is attached to the mount member 101. The mount member 101 is attached in advance to a floor member (not shown) of the projection device housing with a screw member as illustrated. At a substantially central portion of the mount member, a through hole is formed in a thickness direction of the mount member so as to ensure that a part of the projection lens 10 is fitted and that modulated light is incident on the lens. Screws for screwing the flange portion of the projection lens are formed on the outer peripheral portions of the holes on both sides perpendicular to the holes, and screws for attaching an integrated member described later are formed on the other side.

The projection lens 10 is fitted into a hole behind the flange, and the flange portion is screwed to the screw with a screw member to be fixed to the mount member 101. Next, the cross dichroic prism 8 and the polarization beam splitters 6R, 6G, 6B for the respective color lights of the above-mentioned integration are fixed by bonding the transparent glass plate members 103R, 103G, 103B with an adhesive, respectively. Configuration. This has a function of adjusting the optical path length for each color light in addition to the purpose of integration.

Next, the mounting member 102a and the member 1 are mounted on the upper and lower surfaces of the cross dichroic prism 8 described above.
02b (not shown) are bonded with an adhesive to form a further integrated member of the two members and the integrated member. The mounting members 102a and 102b have the same shape, and include a flat portion that adheres to the surface following the upper and lower surfaces of the cross dichroic prism 8, and a mounting portion to the mount member 101 that is bent perpendicular to the portion. Having a shape having The mounting portion of the mounting member 102a bonded to the upper surface of the cross dichroic prism 8 is bent upward and the mounting member 1 mounted on the lower surface
The bent portion of 02b faces downward. Further, a plurality of holes for screw attachment are formed in both bent portions.

The mounting members 102a, 102b
Is screwed to the mount member 101 with a screw member through the hole formed in the bent portion, and can be integrated with the mount member. The integration of the polarization beam splitters 6R, 6G, 6B for each color light, the light valves 7R, 7G, 7B and the quarter-wave phase plates 9R, 9R, 9B will be described.

First and second light valve mounting members 104Ba, 104Bb, 104Ra, and 104B are provided on the upper and lower surfaces of each of the polarization beam splitters, which are orthogonal to the respective color light emission surfaces (the light incident surfaces from the light valves).
104Rb and 104Ga, 104Gb are adhered and attached. These first mounting members are bent upward or downward at right angles to the adhesive mounting surface of each polarizing beam splitter, and have both upward and downward legs at both ends of the bent portions. I have. Then, when attached, the surface formed by the legs and the exit surface of the polarizing beam splitter are fixed to each other in parallel with a predetermined interval. These first integrated members are S
It is made of a PC material or the like, the surface of which is plated, and the legs are plated with solder.

The first light valve mounting member for each color light has a leg portion and a leg portion corresponding to the leg portion, and a quarter-wave phase plate and a light valve having a configuration described later are integrated. The light shielding plate members 106R, 105G, and 105B disposed on the front surface of the light valve in the above member, and are integrated by soldering with the legs of the second light valve mounting member.

The light valve 7R,
The integration of 7G, 7B with quarter-wave phase plates 9R, 9G, 9B will be described with reference to the exploded view of each member in FIG. In FIG. 2, there are exploded views for R, G, and B lights, but in this drawing, the color designation is not described for each member.
The light valve 7 was described at 7B.

The integrated member of the light valve 7 and the quarter-wave phase plate 9 is disposed on the back of the light valve, and serves as a back plate 108 for heat radiation of the light valve 7, the light valve 7, and the second light valve mounting. Light shielding plate 10 which also serves as a member
It is composed of a 5, 1/4 wavelength phase plate holder 107, a 1/4 wavelength phase plate 9, and a cover member 106. A counterbore portion is formed on the back plate 108 having screw portions 108e, 108f, 108g, and 108h at corners, and the light valve 7 is adhered and fitted to the corresponding portion from the back surface and fixed. The light blocking member 105 also has a leg at a position corresponding to the leg of the first mounting member, as described above, to also serve as the second light valve mounting member. Further, inside the corners, screw portions 108e to 108 of the back plate member 108 are provided.
h, through holes 105e to 105h are formed. Further, an opening 105b for ensuring a function as a light shielding member is provided at a substantially central portion, and only light passing through the hole is incident on the light valve 7, and light incident on other portions is It can be blocked by a member.

The quarter-wave phase plate 9 has a circular shape in which both ends are cut in advance so that the direction of the optical axis can be understood from the outside. The 波長 wavelength phase plate 9 is bonded and fixed to the phase plate holder 107. The phase plate holder 107 has a projection 107a for rotating the quarter wavelength phase plate 9 adhered to the member on an arc member having an outer shape following the outer shape of the quarter wavelength phase plate, and a screw 10 on the projection.
7b. As described above, the outer peripheral portion of the quarter-wave phase plate 9 is bonded and fixed to the circular arc portion. At this time, the direction of the protrusion of the holder member 107 and 1
It is important to arrange the quarter-wave phase plate 9 so that the relationship of the direction of the predetermined optical axis coincides. The integrated bonding member of the quarter-wave phase plate 9 and the holder member 107 is disposed in a cover member 106 described later in such a manner that the protrusion 107a projects outside from the inside.

The cover member 106 supplies the 1/4 wavelength phase plate together with the 1/4 wavelength phase plate holder 107, and serves as the entire cover, and as described above. The opening 10 for ensuring that the projection 107 of the wave plate holder projects outside the cover member and for determining the center position of the quarter-wave phase plate.
6a, and further, on the stepped surface, a position where the screw 107b of the protrusion of the holder member 107 coming out of the opening 106a of the cover member 106 matches,
It has an arc-shaped hole 106b. Further, the corner has a step similar to the surface of the cover member so as to be flush with the surface on which the arc hole 106b is formed, and the surface has holes 106e to 106h. Hole portions 105e-105 of the light shielding member 105
By screwing into the threaded portions 107e to 107h of the back plate member through h, the integration of the 波長 wavelength plate 9, the light valve 7, and the second mounting member 105 can be achieved. FIG. 3 shows an integrated perspective assembly diagram.
The position of the rotation axis of the quarter-wave phase plate is set by inserting a screw from the light valve side of the arc hole 106b of the cover member 1067, and inserting the screw into the wave plate holder 10.
7 is secured by being screwed onto the screw 107b of the projection 107a. However, since the screwing of the screw is finally determined at the time of adjusting the optical axis position of the wave plate to be described later, the wave plate is moved to the center by moving the protrusion 107a along the arc hole until then. The screw is not screwed so that the screw can be rotated around the axis, and the screw is screwed.

FIG. 3 shows that a quarter-wave phase plate is disposed inside the cover member 106 as described above,
FIG. 7 is a perspective view showing a configuration in which a screw of the projection 107a is screwed from the wavelength plate side through an arc hole of the cover member.
Returning to FIG. 1, as described above, the light valves 6R, 6G,
6B, the above-described integration is achieved, and these members are then combined with the polarization beam splitters 6 for the respective color lights described above.
First light valve mounting members 104Ra, 104Rb, 104Ga, 104G mounted on R, 6G, 6B
By mounting the legs of the light-shielding members to b, 104Ba, and 104Bb by soldering, the whole integration can be achieved. FIG. 1 shows a state in which only the B light is soldered, and the other colors are shown in a disassembled state in a state where they are still separated.

At the time of integration, each light valve 6R, 6R
It is necessary to match the pixels of G and 6B, that is, to perform registration adjustment. The registration is adjusted when the legs of the first light valve mounting member and the second mounting member are soldered and integrated. In FIG. 1, only the light for B light is integrated, but actually, it is better to start with the light for G light. That is, first, the first integrated members 104Ga and 10Ga
The 4Gb legs have G light valve 7G and 1 /
The legs of the second mounting member of the member integrating the four-wavelength phase plate 9G are fixed by soldering. Next, one of the light valves for R light or B light and the leg of the 1/4 wavelength phase plate integrated member are soldered so as to match the pixels of the projected image of the light valve for G light. To achieve. Next, the legs of the remaining integrated members are soldered in the same manner, and the registration adjustment of the R, G, and B lights is achieved.

After the registration adjustment is achieved, the optical axis of the 1/4 wavelength phase plate for each color is adjusted.
As described above, quarter-wave phase plates 9R, 9G for each color light,
9B are holder members 107R, 107G, 10
7B, the tip portion 107a of the protrusion of the holder member 107 is screwed through the circular arc hole 106b of the cover member 106 in the integrated member for each color light. By moving the protruding portion along the arc-shaped hole, the optical axis of the quarter-wave phase plate can be adjusted.

The adjustment of the optical axis of the quarter-wave phase plate is performed as follows. The light valves for each color are all left unmodulated. That is, each pixel is not selected, and the incident S-polarized light is not modulated and all are emitted as S-polarized light. Ideally, the S-polarized light is all reflected and discarded by the polarization beam splitters 6R, 6G, and 6B for each color, so that the projected image should achieve an ideal black state. However, as described above, this is not the case. In this state, the holder members 107R, 10R, 10R,
By moving the tips of the projections of 7G and 107B along the arc-shaped hole 106b, a portion having the best contrast, that is, a portion having the best black state in the projected image is selected and determined. At the position determined and determined, a screw is screwed and fixed to fix the quarter-wave phase plate.

As described above, the light valve for each color, the polarizing beam splitter for each color light, the analyzing optical system including the cross dichroic and the projection lens, the combining optical system, and the projection lens are integrated around the mount member. A quarter-wave phase plate is also arranged between the beam splitter and the light valve in the direction of the optimal optical axis, and is incorporated into the above-mentioned unit. It is possible to provide a projection-type display device that has less deviation and has good contrast. (Fourth Embodiment) FIG. 5 shows a configuration diagram showing this embodiment together with a partial exploded view. The configuration of the projection display device adopted in this embodiment is that shown in the second embodiment of the projection display device shown in FIG. The illustration of the light source 11 is omitted.

In the present embodiment, similarly to the third embodiment, a mount member 201 to which the projection lens 17 is attached is provided.
For the members of the projection display device,
Polarizing beam splitter 12, prisms 13, 14, 15
Prism member and light bulb 16 made of
R, 16G, 16B and quarter-wave phase plate 18R,
18G and 18B are integrated into an integrated member 202a.
It is also characterized by being attached and integrated using the same member 202b.

The mounting member 201 is the same member 101 of FIG.
And a part of the projection lens 17 is fitted in a through hole of the same member in advance, and the flange portion is fixed to the mount member by screwing it with a screw member. The integration of the polarizing beam splitter 12 and the composite prism member will be described. As described above, as shown in FIG. 5, total reflection is caused between the polarization beam splitter 12 and the entrance surface 13a of the prism 13 constituting the composite prism, and between the 13b surface of the prism 13 and the entrance surface 14a of the prism 14. Voids are formed to ensure the operation.

In the present embodiment, a metal foil having a predetermined thickness is etched into a frame shape having a predetermined opening to form both air gaps.
2 was sandwiched between the two gaps, and both prism members and the frame member were adhered and fixed with an adhesive to form an integrated member. FIG. 7 is an exploded configuration diagram. Prism 14
And 15 are integrated to form a dichroic film on the surface 14a of the prism 14, and to bond the film surface to the surface 15a of the prism 15.

As shown in FIG. 4, the polarizing beam splitter 12 and the composite prism member integrated by the above configuration are attached to the mount member using the integrated members 202a and 202b. Mount member 201a,
201b has the same shape, and the polarization beam splitter 12
And an adhesive surface extending to the prism 13 and the prism 14, and the surface and the adhesive surface to the member are bonded and fixed with an adhesive. The front end of the polarizing beam splitter bonding portion of the mount member has a bent portion so as to be flush with the analysis light emission surface of the polarizing beam splitter 12, and the bent portion is attached to a mount seat. A plurality of holes are formed, and the holes are screwed and fixed to the mount member with a screw member through the holes to achieve integration.

The surfaces of the prism members constituting the composite prism member are perpendicular to the upper and lower surfaces of the exit surfaces 13c, 14c, and 14c so that the soldering legs are parallel to the exit surfaces, respectively. First light valve mounting members 204Ba, 204Bb, 204R for each color light so as to have a predetermined space between the leg and the exit surface.
a, 204Rb, 204Ba, and 204Bb are bonded and attached.

The light valve for each color light, the quarter-wave phase plate, and the method for holding the two members are the same as those of the disassembled portion shown in FIG. 2 and the perspective view of FIG. Similarly to the third embodiment, the two members are soldered and fixed, and the registration of the light valve for each color light is adjusted. Thereafter, the screw and the screw of the holder member are removed from the arc hole side of the cover member. Then, the tip of the phase holder is moved to rotate the quarter-wave phase plate, and the tip and the arc hole are bonded and fixed at the position where the contrast is best.

In the projection type display device of the present embodiment, since the light valves 16R and 16G take a configuration in which they are close to each other,
As shown in FIG. 5, the second mounting members to which the light valves 16R, 16G and the quarter-wave phase plate are mounted are arranged upside down as shown in FIG. Is configured to prevent the

As described above, the white light that has passed through the polarizing beam splitter as the light source light is color-separated into R light, G light, and B light by the composite prism that constitutes the color separation / synthesis optical system, and is converted into a light bulb. A projection type display having a configuration in which the light is made incident, reflected, modulated, and emitted, color synthesis is achieved by the composite prism, modulated light is analyzed and extracted by the polarizing beam splitter, and projected by a projection lens. In the device, for the mount member to which the projection lens is attached,
By providing the polarizing beam splitter, the compound prism, the light valve, and the member in which the 1/4 wavelength phase plate is integrated between the light exit surface of the compound prism and the light valve, the contrast is good and the environmental temperature is high. It is possible to provide a projection-type display device in which a registration shift and a blur of a projected image do not occur due to a change. (Fifth Embodiment) FIG. 1 is a partially exploded view of a configuration diagram showing a fifth embodiment of the present invention.

The configuration of the projection display device employed in this embodiment is that of the projection display device shown in FIG. Since the light source and the color separation optical system in the configuration diagram shown in FIG. 4 are not related to the gist of the present invention, their illustration and description are omitted because they are already formed in FIG. In the present embodiment, in the configuration of the projection display device described in the first embodiment of the projection display device of FIG. 4, the light valves 7R, 7G, 7
B, the polarizing beam splitters 6R, 6G, 6B, the cross dichroic prism 8, and the projection lens 10 are integrated using a mount member 101.

First, the projection lens 10 is attached to the mount member 101. The mount member 101 is attached in advance to a floor member (not shown) of the projection device housing with a screw member as illustrated. At a substantially central portion of the mount member, a through hole is formed in a thickness direction of the mount member so as to ensure that a part of the projection lens 10 is fitted and that modulated light is incident on the lens. Screws for screwing the flange portion of the projection lens are formed on the outer peripheral portions of the holes on both sides perpendicular to the holes, and screws for attaching an integrated member described later are formed on the other side.

The projection lens 10 is fitted into the hole behind the flange, and the flange portion is fixed to the mount member 101 by screwing the flange portion to the screw with a screw member. Next, the cross dichroic prism 8 and the polarization beam splitters 6R, 6G, 6B for the respective color lights of the above-mentioned integration are fixed by bonding the transparent glass plate members 103R, 103G, 103B with an adhesive, respectively. Configuration. This has a function of adjusting the optical path length for each color light in addition to the purpose of integration.

Next, the mounting member 102a and the member 1 are mounted on the upper and lower surfaces of the cross dichroic prism 8 described above.
02b (not shown) are bonded with an adhesive to form a further integrated member of the two members and the integrated member. The mounting members 102a and 102b have the same shape, and include a flat portion that adheres to the surface following the upper and lower surfaces of the cross dichroic prism 8, and a mounting portion to the mount member 101 that is bent perpendicular to the portion. Having a shape having The mounting portion of the mounting member 102a bonded to the upper surface of the cross dichroic prism 8 is bent upward and the mounting member 1 mounted on the lower surface
The bent portion of 02b faces downward. Further, a plurality of holes for screw attachment are formed in both bent portions.

The mounting members 102a, 102b
Is screwed to the mount member 101 with a screw member through the hole formed in the bent portion, and can be integrated with the mount member. The integration of the polarization beam splitters 6R, 6G, 6B for each color light, the light valves 7R, 7G, 7B and the quarter-wave phase plates 9R, 9R, 9B will be described.

The first light valve mounting members 104Ba, 104Bb, 104Ra, and 104B are provided on the upper and lower surfaces of each of the polarization beam splitters, which are orthogonal to the respective color light emission surfaces (the light incident surfaces from the light valves).
104Rb and 104Ga, 104Gb are adhered and attached. These first mounting members are bent upward or downward at right angles to the adhesive mounting surface of each polarizing beam splitter, and have both upward and downward legs at both ends of the bent portions. I have. Then, when attached, the surface formed by the legs and the exit surface of the polarizing beam splitter are fixed to each other in parallel with a predetermined interval. These first integrated members are S
It is made of a PC material or the like, the surface of which is plated, and the legs are plated with solder.

The first light valve mounting member for each color light has a leg portion and a leg portion corresponding to the leg portion, and a quarter-wave phase plate and a light valve having a configuration described later are integrated. The light shielding plate members 106R, 105G, and 105B disposed on the front surface of the light valve in the above member, and are integrated by soldering with the legs of the second light valve mounting member.

The light valve 7R,
The integration of 7G, 7B with quarter-wave phase plates 9R, 9G, 9B will be described with reference to the exploded view of each member in FIG. In FIG. 2, there are exploded views for R, G, and B lights, but in this drawing, the color designation is not described for each member.
The light valve 7 was described at 7B.

The integrated member of the light valve 7 and the quarter-wave phase plate 9 is disposed at the back of the light valve, and serves as a back plate 108 for heat radiation of the light valve 7, the light valve 7, and the second light valve mounting. Light shielding plate 10 which also serves as a member
It is composed of a 5, 1/4 wavelength phase plate holder 107, a 1/4 wavelength phase plate 9, and a cover member 106. A counterbore portion is formed on the back plate 108 having screw portions 108e, 108f, 108g, and 108h at corners, and the light valve 7 is adhered and fitted to the corresponding portion from the back surface and fixed.

The light shielding member 105 has through holes 105e to 105h at positions corresponding to the threaded portions 108e to 108h of the back plate member 108 inside the corners. Further, an opening 105b for ensuring a function as a light shielding member is provided at a substantially central portion, and only light passing through the hole is made incident on the light valve 7, and light incident on other portions is It can be blocked by a member.

The quarter-wave phase plate 9 has a circular shape in which both ends are cut in advance so that the direction of the optical axis can be seen from the outside. The 波長 wavelength phase plate 9 is bonded and fixed to the phase plate holder 107. The phase plate holder 107 has a projection 107a for rotating the quarter wavelength phase plate 9 adhered to the member on an arc member having an outer shape following the outer shape of the quarter wavelength phase plate, and a screw 10 on the projection.
7b. As described above, the outer peripheral portion of the quarter-wave phase plate 9 is bonded and fixed to the circular arc portion. At this time, the direction of the protrusion of the holder member 107 and 1
It is important to arrange the quarter-wave phase plate 9 so that the relationship of the direction of the predetermined optical axis coincides. The integrated bonding member of the quarter-wave phase plate 9 and the holder member 107 is disposed in a cover member 106 described later in such a manner that the protrusion 107a projects outside from the inside.

The cover member 106 supplies the 1/4 wavelength phase plate together with the 1/4 wavelength phase plate holder 107, and serves as the entire cover, and as described above. The opening 10 for ensuring that the projection 107 of the wave plate holder projects outside the cover member and for determining the center position of the quarter-wave phase plate.
6a, and further, on the stepped surface, a position where the screw 107b of the protrusion of the holder member 107 coming out of the opening 106a of the cover member 106 matches,
It has an arc-shaped hole 106b. Further, the corner has a step similar to the surface of the cover member so as to be flush with the surface on which the arc hole 106b is formed, and the surface has holes 106e to 106h. Hole portions 105e-105 of the light shielding member 105
By screwing into the threaded portions 107e to 107h of the back plate member through h, the integration of the 波長 wavelength plate 9, the light valve 7, and the second mounting member 105 can be achieved. FIG. 3 shows an integrated perspective assembly diagram.
The position of the rotation axis of the quarter-wave phase plate is set by inserting a screw from the light valve side of the arc hole 106b of the cover member 1067, and inserting the screw into the wave plate holder 10.
7 is secured by being screwed onto the screw 107b of the projection 107a. However, since the screwing of the screw is finally determined at the time of adjusting the optical axis position of the wave plate to be described later, the wave plate is moved to the center by moving the protrusion 107a along the arc hole until then. The screw is not screwed so that the screw can be rotated around the axis, and the screw is screwed.

In FIG. 3, a 1/4 wavelength phase plate is disposed in the cover member 106 as described above,
FIG. 7 is a perspective view showing a configuration in which a screw of the projection 107a is screwed from the wavelength plate side through an arc hole of the cover member.
Returning to FIG. 1, as described above, the light valves 6R, 6G,
6B, the above-described integration is achieved, and these members are then combined with the polarization beam splitters 6 for the respective color lights described above.
First light valve mounting members 104Ra, 104Rb, 104Ga, 104G mounted on R, 6G, 6B
By mounting the legs of the light-shielding members to b, 104Ba, and 104Bb by soldering, the whole integration can be achieved. FIG. 1 shows a state in which only the B light is soldered, and the other colors are shown in a disassembled state in a state where they are still separated.

At the time of integration, each light valve 6R, 6R
It is necessary to match the pixels of G and 6B, that is, to perform registration adjustment. The registration is adjusted when the legs of the first light valve mounting member and the second mounting member are soldered and integrated. In FIG. 1, only the light for B light is integrated, but actually, it is better to start with the light for G light. That is, first, the first integrated members 104Ga and 10Ga
The 4Gb legs have G light valve 7G and 1 /
The legs of the second mounting member of the member integrating the four-wavelength phase plate 9G are fixed by soldering. Next, one of the light valves for R light or B light and the leg of the 1/4 wavelength phase plate integrated member are soldered so as to match the pixels of the projected image of the light valve for G light. To achieve. Next, the legs of the remaining integrated members are soldered in the same manner, and the registration adjustment of the R, G, and B lights is achieved.

After the registration adjustment is achieved, the optical axis of the quarter-wave phase plate for each color is adjusted.
As described above, quarter-wave phase plates 9R, 9G for each color light,
9B are holder members 107R, 107G, 10
7B, the tip portion 107a of the protrusion of the holder member 107 is screwed through the circular arc hole 106b of the cover member 106 in the integrated member for each color light. By moving the protruding portion along the arc-shaped hole, the optical axis of the quarter-wave phase plate can be adjusted.

The optical axis of the quarter-wave phase plate is adjusted as follows. The light valves for each color are all left unmodulated. That is, each pixel is not selected, and the incident S-polarized light is not modulated and all are emitted as S-polarized light. Ideally, the S-polarized light is all reflected and discarded by the polarization beam splitters 6R, 6G, and 6B for each color, so that the projected image should achieve an ideal black state. However, as described above, this is not the case. In this state, the holder members 107R, 10R, 10R,
By moving the tips of the projections of 7G and 107B along the arc-shaped hole 106b, a portion having the best contrast, that is, a portion having the best black state in the projected image is selected and determined. At the position determined and determined, a screw is screwed and fixed to fix the quarter-wave phase plate.

As described above, the light valve for each color, the polarizing beam splitter for each color light, the analyzing optical system including the cross dichroic and the projection lens, the combining optical system, and the projection lens are integrated around the mount member. A quarter-wave phase plate is also arranged between the beam splitter and the light valve in the direction of the optimal optical axis, and is incorporated into the above-mentioned unit. It is possible to provide a projection-type display device that has less deviation and has good contrast. (Sixth Embodiment) An opening 105b for ensuring the function as a light shielding member is provided at a substantially central portion, and only light passing through the hole is made incident on the light valve 7, and the light is then applied to another portion. The process is the same as that of the third embodiment until the incident light can be blocked by the member.

In this embodiment, the hole and the hole 105
g, 105h, the three bosses 105x, 105
y, 105z are formed. A circumferential portion of a quarter-wave phase plate to be described later is arranged following these bosses. Further, a hole 105 formed in an arc shape is formed near the end between the opening and the holes 105e and 105f.

The shape of the quarter-wave phase plate 9 is the same as that of the third embodiment. The quarter-wave phase plate 9 is bonded to the phase plate holder 107 in order to secure the position of the optical axis due to the rotation of the quarter-wave phase plate 9. The phase plate holder 107 includes a projection 107a for rotating the quarter-wave phase plate 9 adhered to the arc-shaped member having an outer shape following the outer shape of the quarter-wave phase plate, and a tip end of the projection. Is bent vertically, and the outer peripheral portion of the quarter-wave phase plate 9 is adhered and fixed to the arc adjacent portion as described above. In this case, it is important that the direction of the projection of the holder member 107 and the direction of the predetermined optical axis of the quarter-wavelength phase plate 9 are aligned so as to match each other. The adhesive integrated member of the quarter-wave phase plate 9 and the holder member 107 is configured such that the outer circumferential arc portion of the wave plate 1/4 is formed by the boss portion 105x of the light shielding member 105,
When they are arranged following the 105y and 105z, the bent end portion 107b of the protrusion 107a of the holder is inserted into the arc-shaped hole 105a. At this time, the bent portion 1
07b is not perpendicular to the projection 107a, but is bent in advance so as to have a slight obtuse angle. When the bent portion is inserted into the arc-shaped hole 105a, the outer portion of the arc-shaped hole has elasticity. It is configured to be pressed.
Further, the distal end of the bent portion 107b is configured to slightly protrude to the opposite side of the light shielding member 105 through the arc-shaped hole. The cover member 106 covers the whole from the top of the quarter-wave phase plate holder 107. The cover member 106 has holes 106e to 106h with a step at the corner thereof, and the screw member is used to cut the hole from the hole. Hole 10 of light shielding member 105
Screws 107e-1 of the back plate member through 5e-105h
By screwing the quarter wave plate 07h to each of them, integration of the quarter wave plate 9, the light valve 7, and the second mounting member 105 can be achieved. FIG. 3 shows an integrated perspective assembly diagram.

Returning to FIG. 1, the above-mentioned integration is achieved for each of the light valves 6R, 6G, 6B as described above, and these members are then replaced by the above-mentioned polarizing beam splitters 6R, 6G, 6B for each color light. The first light valve mounting members 104Ra, 104Rb, 104Ga
The whole integration can be achieved by attaching the legs of the light shielding members to the 104Gb, 104Ba, and 104Bb by soldering. FIG. 1 shows a state in which only the B light is soldered, and the other colors are shown in a disassembled state in a state where they are still separated.

At the time of integration, each light valve 6R, 6R
It is necessary to match the pixels of G and 6B, that is, to perform registration adjustment. The registration is adjusted when the legs of the first light valve mounting member and the second mounting member are soldered and integrated. In FIG. 1, only the light for B light is integrated, but actually, it is better to start with the light for G light. That is, first, the first integrated members 104Ga and 10Ga
The 4Gb legs have G light valve 7G and 1 /
The legs of the second mounting member of the member integrating the four-wavelength phase plate 9G are fixed by soldering. Next, one of the light valves for R light or B light and the leg of the 1/4 wavelength phase plate integrated member are soldered so as to match the pixels of the projected image of the light valve for G light. To achieve. Next, the legs of the remaining integrated members are soldered in the same manner, and the registration adjustment of the R, G, and B lights is achieved.

After the registration adjustment is achieved, the optical axis of the quarter-wave phase plate for each color is adjusted.
As described above, quarter-wave phase plates 9R, 9G for each color light,
9B are holder members 107R, 107G, 10
7B, the front end portion 107b of the protrusion of the holder member 107 is elastically pressed against the end face of the arc-shaped hole provided in the light shielding member in the integrated member for each color light. ing. Although the tip has a configuration protruding from the hole to the opposite surface, the optical axis of the quarter-wave plate wavelength phase plate can be adjusted by moving the protrusion along the arc-shaped hole.

The adjustment of the optical axis of the quarter-wave phase plate is substantially the same as that of the third embodiment. The 1 / wavelength phase plate is fixed with an adhesive. (Seventh Embodiment) The description of the fourth embodiment is the same up to the description of each color light valve, the quarter-wave phase plate, and the method of holding them, with reference to FIGS.

In this embodiment, the light valve first mounting member has a leg portion to be soldered to the leg portion.
The light shielding member of FIG. 2 is also used, and both members are soldered and fixed in the same manner as in the previous embodiment to perform registration adjustment of the light valve for each color light, and thereafter, through the arc hole of the light shielding member. The front end of the phase holder, which protrudes to the rear side, is moved to rotate the quarter-wave phase plate, and the front end and the arc hole are bonded and fixed at the position where the contrast is best.

In the projection type display device of this embodiment, since the light valves 16R and 16G are close to each other, the second mounting member to which the light valves 16R and 16G and the quarter-wave phase plate are mounted is shown in FIG. As shown in the figure, the arrangement is made upside down so as to prevent interference between members.

[0076]

As described above, the contrast of the projected image is improved, and a clearer image can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a projection display device of the present invention.

FIG. 2 is a diagram showing a light valve and a quarter of the light valve employed in the present invention.
FIG. 3 is a schematic exploded configuration diagram illustrating integration of a wavelength phase plate.

FIG. 3 is a schematic perspective assembly view of an integrated member of a light valve and a quarter-wave phase plate according to the present invention.

FIG. 4 is a schematic configuration diagram of a projection display device adopted in the embodiment.

FIG. 5 is a schematic exploded configuration diagram of the device described in the embodiment.

FIG. 6 is a schematic configuration diagram of a projection display device adopted in the embodiment.

FIG. 7 is a schematic exploded view illustrating the integration of the polarizing beam splitter and the composite prism.

FIG. 8 is a schematic configuration diagram showing a configuration of a conventional projection display device.

FIG. 9 is a schematic perspective assembly view illustrating the arrangement of a conventional quarter-wave phase plate.

[Explanation of symbols]

1, 11 Light source 6R, 6G, 6B, 12 Polarizing beam splitter 7R, 7G, 7B, 16R, 16G, 16B Reflective light valve 9R, 9G, 9B, 18R, 18G, 18B Quarter-wave phase plate 10, 17 Projection lens

Claims (10)

[Claims]
1. A light source, a color separation optical system for color separation into R (red) light, G (green) light and B (blue) light, a polarizing beam splitter arranged for each color light, And a reflection type light valve disposed between the polarization beam splitter for each color light and the light valve for each color light.
In a projection type display device having a 波長 wavelength phase plate, a color combining optical system, and a projection lens, the light valve and the 1
A quarter-wave phase plate and the polarization beam splitter are integrated, and the integration is performed by a first integrated member attached to the polarization beam splitter, and a member obtained by integrating the quarter-wave phase plate and the light valve. And the light valve is integrated with the cover member, the quarter-wave phase plate holder, and the quarter-wave phase plate holder. It has a fixed quarter-wave phase plate, a light shielding plate, the light valve, and a back plate to which the light valve is fixed, and the quarter-wave phase plate holder has a protrusion having a screw part. The cover member has an arc-shaped hole, and the quarter-wave phase plate holder to which the quarter-wave phase plate is attached is provided with an opening of the cover member in the cover member together with the quarter-wave phase plate. From department The raised portion is projected outside the cover member, and the holder member is screwed and fixed to the cover member with a screw through a projection screw portion and an arc-shaped hole of the cover member. The configuration in which the wavelength phase plate and the polarization beam splitter are integrated includes a first mounting member attached to the polarization beam splitter, and the light shielding plate in the integrated member of the quarter wavelength phase plate and the light valve. A projection type display device characterized by being attached with.
2. A light source, a polarizing beam splitter, and R
A color separation / synthesis optical system including a plurality of prisms that also serves as a color separation optical system that separates (red) light, G (green) light, and B (blue) light, and a synthesis optical system that performs color synthesis of the respective color lights; A projection type display device having a reflection type light valve arranged for each color light, a quarter wavelength phase plate arranged between the color separation / combination prism and the light valve for each color light, and a projection lens; The valve, the quarter-wave phase plate and the plurality of prisms are integrated, and the integration includes a first light valve mounting member mounted on the prism and a member obtained by integrating the quarter-wave phase plate. The integrated member of the quarter-wave phase plate and the light valve includes a cover member, a quarter-wave phase plate holder, and the quarter-wave plate fixed to the quarter-wave plate holder.
A wavelength phase plate, a light shielding plate, a light valve, and a back plate to which the light valve is fixed;
The wavelength phase plate holder has a protrusion having a screw portion, the cover member has an arc-shaped hole, and the quarter wavelength phase plate holder on which the quarter wavelength phase plate is mounted is a quarter wavelength. Along with the phase plate, the cover is disposed in the cover with a protrusion projecting from the opening of the cover to the outside of the cover, and the holder is provided with the cover through a protrusion screw and an arc-shaped hole of the cover. The member is screwed and fixed with a screw, and the light valve, the 波長 wavelength phase plate and the polarization beam splitter are integrated with each other by a first attachment member attached to the polarization beam splitter,
A projection type display device, wherein a / 4 wavelength phase plate and the light shielding plate in an integrated member of the light valve are attached.
3. A light source, a polarizing beam splitter, and R
A color separation / synthesis optical system composed of a plurality of prisms which also serves as a color separation optical system for separating (red) light, G (green) light and B (blue) light into light, and a synthesis optical system for color combining the respective color lights. A reflection type light valve disposed for each color light, a 波長 wavelength phase plate disposed between the color separation / combination prism and the light valve for each color light, and a projection display device having a projection lens, A light valve, a 1/4 wavelength phase plate and the plurality of prisms are integrated, and the integration is performed by integrating a first light valve mounting member attached to the prism and a member integrating the 1/4 wavelength phase plate. The integrated member of the 1/4 wavelength phase plate and the light valve is provided with a cover member, a 1/4 wavelength phase plate holder, and a 1/4 wavelength plate fixed to the 1/4 wavelength plate holder.
A four-wavelength phase plate, a light-shielding plate, a light valve, and a back plate to which the light valve is fixed; the quarter-wave phase plate holder having a protrusion having a screw portion; Has an arc-shaped hole, and the quarter-wave phase plate holder to which the quarter-wave phase plate is attached, together with the quarter-wave phase plate, has a projection formed in the cover member from an opening of the cover member. Is disposed in a configuration protruding out of the cover member. The cover member is screwed and fixed to the holder member through a protrusion screw portion and an arc-shaped hole of the cover member. The integration of the quarter-wave phase plate and the polarizing beam splitter includes a first mounting member attached to the polarizing beam splitter, and the cover member in the integrated member of the quarter-wave phase plate and the light valve. Projection display device which is characterized in that attached.
4. The holder according to claim 1, wherein the quarter-wave phase plate holder and the cover member include, in the hole portion, a screw fitted into an arc hole of the cover portion before screwing the holder member to a screw portion at a tip end. Moving along and rotating the quarter-wave phase plate,
The method for adjusting the contrast of a projection image of a projection display device according to claim 1, wherein the contrast of the projection image is adjusted.
5. A light source, a color separation optical system for color separation into R (red) light, G (green) light and B (blue) light, a polarizing beam splitter arranged for each color light, and And a reflection type light valve disposed between the polarization beam splitter for each color light and the light valve for each color light.
In a projection type display device having a 波長 wavelength phase plate, a color combining optical system, and a projection lens, the light valve, the 波長 wavelength phase plate, and the polarization beam splitter are integrated, and the integration is performed as described above. This is performed by attaching a first light valve attachment member attached to the light valve and a member obtained by integrating the quarter wavelength phase plate.
The integrated member that integrates the wavelength phase plate and the light valve includes a cover member, a quarter-wave phase plate holder, a quarter-wave phase plate fixed to the quarter-wave plate holder, and light. A light-shielding plate, the light valve, and a back plate to which the light valve is fixed; the quarter-wave phase plate holder having a protrusion with a bent end portion; The quarter-wave phase plate holder having the quarter-wave phase plate attached thereto, together with the quarter-wave phase plate, has a projecting portion from an opening of the cover member in the cover member. Has a configuration that protrudes outside,
The bent end portion of the holder member protrusion is inserted into an arc-shaped hole of the light shielding member, and the light valve, the 1 / wavelength phase plate, and the polarization beam splitter are integrated with each other. A projection display device comprising: a first attachment member attached to a polarization beam splitter; and the light shielding plate in an integrated member of the quarter-wave phase plate and the light valve.
6. A light source, a polarizing beam splitter, and R
A color separation / synthesis optical system including a plurality of prisms that also serves as a color separation optical system that separates (red) light, G (green) light, and B (blue) light, and a synthesis optical system that performs color synthesis of the respective color lights; A projection type display device having a reflection type light valve arranged for each color light, a quarter wavelength phase plate arranged between the color separation / combination prism and the light valve for each color light, and a projection lens; The valve, the 1/4 wavelength phase plate and the plurality of prisms are integrated, and the integration is
This is performed by attaching a first light valve attachment member attached to the prism and a member obtained by integrating the 1/4 wavelength phase plate. The integrated member of the 1/4 wavelength phase plate and the light valve includes a cover member and , A quarter-wave phase plate holder, the quarter-wave plate, a light shielding member, the light valve, and a back plate. The light shielding member has an arc-shaped hole, and the quarter-wave phase plate holder with the quarter-wave phase plate attached thereto, together with the quarter-wave phase plate, has an opening in the cover member. A projection is projected out of the cover member from the portion, and a tip bending member of the projection is inserted into the arc-shaped hole, and the light valve is integrated with the quarter-wave phase plate and the polarization beam splitter. Is the A first mounting member attached to the light beam splitter, the projection display apparatus and performs in a quarter wave plate mounted between said light blocking member in the integrated member of the light valve.
7. The quarter-wave plate holder member is moved along the arc-shaped hole portion before the bent-end portion of the projection portion is inserted into the arc-shaped hole portion of the light shielding member before being inserted into the arc-shaped hole portion.
7. The method according to claim 6, wherein the contrast of the projected image is adjusted by rotating the wavelength phase plate.
8. A light source, a color separation optical system for color separation into R (red) light, G (green) light and B (blue) light, a polarizing beam splitter arranged for each color light, And a reflection type light valve disposed between the polarization beam splitter for each color light and the light valve for each color light.
In a projection type display device having a 波長 wavelength phase plate, a color combining optical system, and a projection lens, the light valve and the 1
The 波長 wavelength phase plate and the polarizing beam splitter are integrated, and the integration is performed by mounting a first light valve mounting member mounted on the light valve and a member integrating the 波長 wavelength phase plate. , The 1/4
The integrated member for integrating the wavelength phase plate and the light valve includes a cover member, a quarter wavelength phase plate holder, a quarter wavelength phase plate and a light shielding plate fixed to the quarter wavelength plate holder, and The light valve has a back plate to which the light valve is fixed, and the quarter-wave phase plate holder has a protrusion having a bent front end, and the bent end of the protrusion is attached to the light shielding member. Projecting to the back of the light shielding member through the formed hole, the light shielding member,
A projection display device, which also serves as a mounting member for the first light valve mounting member.
9. A light source, a polarizing beam splitter, and R
A color separation / synthesis optical system including a plurality of prisms that also serves as a color separation optical system that separates (red) light, G (green) light, and B (blue) light, and a synthesis optical system that performs color synthesis of the respective color lights; A projection type display device having a reflection type light valve arranged for each color light, a quarter wavelength phase plate arranged between the color separation / combination prism and the light valve for each color light, and a projection lens; The bulb, the quarter-wave phase plate and the plurality of prisms are integrated, and the integration includes a first light valve mounting member mounted on the prism and a member integrating the quarter-wave phase plate. The integrated member of the quarter-wave phase plate and the light valve includes a cover member, a quarter-wave phase plate holder, the quarter-wave plate, a light shielding member, and the light valve. And the backboard Wherein the quarter-wave phase plate holder has a projection with a tip bent, and the light-blocking member is projected to the back of the light-blocking portion through a hole formed in the light-blocking member, The light-shielding member also serves as an attachment member for the first light valve attachment member.
10. A method for adjusting the contrast of a projected image by rotating the quarter-wave phase plate around an optical axis using the projection display device according to claim 8 or 9. A method of adjusting the contrast of the projected image by rotating the quarter-wave phase plate by moving the tip of the quarter-wave phase holder protruding from the back of the holder along the hole.
JP2000039723A 2000-02-14 2000-02-14 Projection type display device and method for adjusting contrast Pending JP2001228534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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JP2006085077A (en) * 2004-09-17 2006-03-30 Canon Inc Projection type image display device and adjusting method used therefor
US7114811B2 (en) 2003-10-06 2006-10-03 Seiko Epson Corporation Optical assembly and projector
JP2007011301A (en) * 2005-06-01 2007-01-18 Canon Inc Optical modulation element unit, projection optical unit, and image projection apparatus
JP2007025153A (en) * 2005-07-14 2007-02-01 Sony Corp Liquid crystal panel block and liquid crystal projector apparatus
JP2007108735A (en) * 2005-09-16 2007-04-26 Victor Co Of Japan Ltd Reflection type projection display apparatus
US7532407B2 (en) 2005-08-09 2009-05-12 Hitachi, Ltd. Projection display
CN102135717A (en) * 2010-01-26 2011-07-27 精工爱普生株式会社 Projector

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7114811B2 (en) 2003-10-06 2006-10-03 Seiko Epson Corporation Optical assembly and projector
JP2006085077A (en) * 2004-09-17 2006-03-30 Canon Inc Projection type image display device and adjusting method used therefor
US7466368B2 (en) 2004-09-17 2008-12-16 Canon Kabushiki Kaisha Image projection apparatus and adjusting method used for the same
JP2007011301A (en) * 2005-06-01 2007-01-18 Canon Inc Optical modulation element unit, projection optical unit, and image projection apparatus
JP2007025153A (en) * 2005-07-14 2007-02-01 Sony Corp Liquid crystal panel block and liquid crystal projector apparatus
CN103207506A (en) * 2005-08-09 2013-07-17 株式会社日立制作所 Projection display
US7532407B2 (en) 2005-08-09 2009-05-12 Hitachi, Ltd. Projection display
US7982958B2 (en) 2005-08-09 2011-07-19 Hitachi, Ltd. Projection display
CN103207506B (en) * 2005-08-09 2015-04-01 日立麦克赛尔株式会社 Projection display
JP2007108735A (en) * 2005-09-16 2007-04-26 Victor Co Of Japan Ltd Reflection type projection display apparatus
CN102135717A (en) * 2010-01-26 2011-07-27 精工爱普生株式会社 Projector
CN102135717B (en) * 2010-01-26 2012-12-12 精工爱普生株式会社 Projector

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