JP2005346089A - Optical device, manufacturing method for optical device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To miniaturize a projector, to reduce the manufacturing cost and to increase the image quality by simplifying a POP structure for integrating an optical modulator and color synthesizing optical elements into one body. <P>SOLUTION: The optical device is constituted to have the POP structure, wherein pins 447A integrally formed in a holding member 446 are inserted through holes 443D formed in four corners of a holding frame 443 for storing respective liquid crystal panels 441R, 441G and 441B, and the holding frame 443 and the holding member 446 are fixed by adhesion, and the end face on the side opposite to the pin 447A of the holding member 446 is fixed by adhesion to a side face of a pedestal 445 fixed to upper and lower faces of a cross dichroic prism 45. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical device in which a light modulation device that modulates color light according to image information and a color combining optical element that combines color light modulated by the light modulation device, a method for manufacturing the optical device, and The present invention relates to a projector that employs the optical device.

  Conventionally, a light beam emitted from a light source is separated into three primary colors of red, green, and blue light by a color separation optical system using a dichroic mirror, etc. There is known a so-called three-plate type projector that modulates according to image information, synthesizes each color light after image modulation with a cross dichroic prism, and enlarges and projects a color image through a projection lens.

In such a projector, each light modulator must be at the back focus position of the projection lens. In addition, since one display pixel is formed by additive color mixture of the three primary colors of red, green, and blue, in order to obtain a clearer image, the pixel shift between the liquid crystal panels and the shift of the distance from the projection lens are reduced. It is necessary to prevent the occurrence. At the time of manufacturing the projector, it is necessary to perform a focus adjustment for accurately arranging each light modulation device at the back focus position of the projection lens and an alignment adjustment for matching the pixels of each light modulation device with high accuracy. Here, when the predetermined optical axis (usually, the optical axis of the projection lens) is the Z axis, and the two axes orthogonal thereto are the X axis and the Y axis, the focus adjustment is centered on the Z axis direction and the X axis. Adjustment of the rotation direction (Xθ direction) and the rotation direction (Yθ direction) about the Y axis are included. The alignment adjustment includes adjustment in the X-axis direction, the Y-axis direction, and the rotation direction (θ direction) in the XY plane.
For this reason, conventionally, an optical device in which the position of the light modulation device is adjusted and then directly fixed to the light beam incident end face of the cross dichroic prism is employed.

  According to such an optical device, the mutual position of each light modulation device and the focus position with respect to the projection lens can be adjusted with high accuracy via the cross dichroic prism. Therefore, when assembling an optical apparatus such as a projector, the adjustment work can be greatly reduced as compared with the case where the position of the cross dichroic prism and the three light modulation devices are individually adjusted and fixed in the apparatus. .

  As a structure of the optical device in which the cross dichroic prism and the light modulation device are integrated as described above, for example, as described in Japanese Patent Application Laid-Open No. 2000-221588, light modulation is performed on a holding frame having holes at four corners. The device is housed, and a pin coated with an adhesive is inserted into the hole, and the end surface of the pin, the light incident end surface of the cross dichroic prism, and the side surface of the pin and the hole of the holding frame are bonded and fixed to each other. There is one (so-called pin spacer type POP (Panel On Prism) structure).

  Further, for example, as described in Japanese Patent Application Laid-Open No. 10-10994, the light modulation device is housed in the holding frame, while a frame-shaped attachment member is bonded to the light flux incident end surface of the cross dichroic prism, In some cases, a plate-like intermediate frame is fixed to the mounting member with screws, and the holding frame and the intermediate frame member are bonded and fixed to each other via a wedge-shaped spacer (so-called triangular spacer type POP). Construction).

However, all the conventional POP structures have a large number of parts and a complicated structure because the light modulation device is bonded and fixed to the light beam incident end face of the cross dichroic prism via pins, mounting members, and spacers. There is a problem that manufacturing is relatively difficult. Such a problem may result in inhibition of downsizing of the optical device and an increase in manufacturing cost.
In addition, since the conventional POP structure is such that the light modulation device is fixed to the light beam incident end face of the cross dichroic prism via a pin or a mounting member, the light beam incident end face of the prism fixes the light modulation device. It is necessary to have a sufficient area. Therefore, the cross dichroic prism cannot be reduced in size. Such a problem may result in inhibition of downsizing of the optical device and an increase in manufacturing cost.

Furthermore, in the POP structure of the pin spacer type, when the light modulation device is replaced due to a manufacturing defect or failure, the adhesive remains on the light beam incident end face of the pin and the cross dichroic prism. Need to be replaced. As a result, such a problem may lead to an increase in manufacturing cost and a decrease in after-service performance.
Furthermore, in the conventional POP structure, the position of the light modulation device with respect to the incident end face of the cross dichroic prism is relatively determined via the holding member and the pin or spacer. Therefore, there are problems that it is relatively difficult to adjust the position of the light modulation device and that the positional deviation of the pins and spacers has a great influence on the positional deviation of the light modulation device. Such a problem may result in an increase in manufacturing cost and a decrease in image quality.

  An object of the present invention is to provide an optical device, a method for manufacturing the optical device, and a projector capable of solving at least one of the above problems.

  The optical device of the present invention is provided integrally with a plurality of light modulation devices that modulate a plurality of color lights according to image information for each color light, and a color combining optical element that combines each color light modulated by the light modulation device. A holding frame that holds the light modulation device and has an opening in a portion corresponding to an image forming area of the light modulation device, and a light beam incident end surface of the color combining optical element. A pedestal fixed to at least one of the pair of end surfaces, a standing piece formed so as to cover a side edge of the holding frame, and a support piece for supporting the color combining optical element side surface of the holding frame A holding member that is directly fixed to the pedestal, and a spacer that is disposed between the holding frame and the upright piece of the holding member, and the holding frame includes the spacer. It is fixed to the holding member via

The optical device of the present invention has the following operations and effects.
(A) Unlike the conventional POP structure, the light modulation device is not fixed to the light beam incident end surface of the color combining optical element, but a pedestal fixed to the end surface intersecting the light beam incident end surface of the color combining optical element. Since it is fixed to the side surface, a space for fixing the light modulation device on the light beam incident end face of the color synthesis optical element becomes unnecessary. Therefore, the size of the color synthesizing optical element can be reduced, thereby reducing the size and the manufacturing cost of the optical device, and thus the optical equipment in which it is used.
(B) Further, as in the prior art, the position of the light modulation device is not defined by the light beam incident end face of the color synthesis optical element, but is defined by the pedestal side face. Therefore, the size of the color separation combining optical element can be reduced. As a result, it is possible to reduce the size and manufacturing cost of the optical device and by extension, the optical equipment in which it is used. Furthermore, when this optical device is employed in a projector, the back focus of the projection lens can be shortened, so that a large amount of light can be swallowed by the projection lens, and a bright projection image can be obtained.

(C) Further, the light modulation device is not fixed to the light beam incident end surface of the color combining optical element, but is fixed to the side surface of the base fixed to the end surface intersecting the light beam incident end surface of the color combining optical element. Therefore, when the light modulation device needs to be replaced at the time of manufacture or after manufacture, the light beam incident end face of the color combining optical element is not damaged even if the light modulation device is removed. Further, even when the light modulation device and the color synthesis optical element are fixed by bonding, it is not necessary to remove the adhesive fixed to the light beam incident end face of the color synthesis optical element after removing the light modulation device. . Therefore, it is possible to contribute to the reduction of the manufacturing cost and the improvement of after-sales performance of the optical device and, in turn, the optical equipment in which it is used.
(D) Furthermore, the side surface of the pedestal and the surface of the holding member are fixed without interposing a member for position adjustment such as a pin or a spacer. Although the position of the light modulation device is relatively fixed to the side surface of the pedestal via the spacer, there is no spacer between the holding member and the light incident end surface of the color combining optical element. In addition, the spacer is disposed between the standing piece of the holding member formed so as to cover the side edge of the light modulation device and the holding frame for holding the light modulation device. Therefore, the position adjustment of the light modulation device is easy, and the influence of the position shift of the spacer after the position adjustment on the position shift of the light modulation device is relatively small. Therefore, it is possible to contribute to the reduction of the manufacturing cost and the improvement of the image quality of the optical device, and thus the projector in which it is used.
Note that “directly fixed to the side surface of the pedestal” means that the holding member is fixed to the side surface of the pedestal without using a position adjusting member such as a spacer or a pin. Therefore, the present invention includes a case where a sapphire substrate or a metal plate is interposed between the side surface of the base and the holding member for improving heat dissipation.

In the optical device according to the aspect of the invention, it is preferable that the holding frame includes a concave frame body that houses the light modulation device and a support plate that presses and fixes the light modulation device housed.
If the holding frame has such a configuration, the light modulation device can be easily housed and fixed, and the light modulation device can be stably held and fixed.
On the other hand, in the optical device of the present invention, the holding frame is configured by a support member that supports the light incident side of the light modulation device, and the light emission side of the light modulation device is held by the holding member. May be.
With such a configuration, the structure can be simplified and the manufacture is facilitated. Therefore, it becomes possible to contribute to the downsizing of the optical device and, in turn, the optical equipment in which the optical device is employed, and to reduce the manufacturing cost. If it is provided between the surface of the member on the light modulation device side, the position of the light modulation device in the Z-axis direction and the position in the rotation direction with respect to the X-axis and the Y-axis can be adjusted.

In the optical device of the present invention, the holding member can be made of a light transmissive material. An example of such a material is a light transmissive resin such as an acrylic material.
Thus, if the holding member is made of a light-transmitting material, the fixing can be easily performed by using the photo-curing adhesive for fixing the holding frame and the holding member, and the holding member and the base. . Therefore, it is possible to improve the manufacturing efficiency of the optical device and, in turn, the optical equipment in which it is used.
In addition, if the holding member is made of resin such as acrylic material, polycarbonate with carbon filler, polyphenylene sulfide, liquid crystal resin, etc., the holding member can be easily manufactured by injection molding, etc. Connected. In addition, the weight of the holding member can be reduced, and the weight reduction of the optical device, and thus the optical apparatus in which the optical device is used can be promoted.

On the other hand, the holding member can be made of metal. Examples of such a material include aluminum, magnesium, titanium, which are lightweight and have good thermal conductivity, or alloys containing these as main materials.
When the holding member is made of metal, it is preferable to fix the holding frame and the holding member with a thermosetting adhesive. If a thermosetting adhesive is used, the adhesive can be cured in a short time due to the good thermal conductivity of the metal. Therefore, it is possible to improve the manufacturing efficiency of the optical device and, in turn, the optical equipment in which it is used.

In the optical device according to the aspect of the invention, the pedestal can be fixed to both of a pair of end surfaces intersecting with a light beam incident end surface of the color combining optical element.
At this time, if a recess is formed in a part of the end surface of the pedestal to which the holding member is bonded and fixed, the light modulation device can be easily removed at the time of manufacturing or when the light modulation device needs to be replaced after the manufacturing. It becomes possible. That is, since a tool such as a screwdriver can be inserted into the recess formed on the side surface of the base, the work of peeling off the holding member and the color combining optical element is facilitated. Therefore, it is possible to contribute to further reduction in manufacturing cost and further improvement in after-sales performance of the optical device, and in turn, the optical equipment in which it is used.
In this case, it is preferable that the side surface of the pedestal protrudes beyond the light beam incident end surface of the color combining optical element. With such a configuration, when the holding member is fixed to the side surface of the pedestal by bonding, even if the adhesive overflows from the joint surface, the overflowing adhesive can be received at the protruding portion. Therefore, it is possible to prevent the adhesive from leaking to the light beam incident end face of the color synthesis optical element. Therefore, when this optical element is employed in an optical apparatus such as a projector, it is possible to contribute to further improvement in image quality.

  In the optical device of the present invention, the pedestal is fixed to only one of the pair of end faces intersecting with the light beam incident end face of the color combining optical element, and the opposing holding members are connected in the vicinity of the other end face. A connecting member can be provided. In such a configuration, at least two of the pedestal, the holding member, and the connecting member are integrally formed, thereby further simplifying the structure and shortening the manufacturing process. Therefore, it is possible to contribute to further downsizing of the optical device and, in turn, the optical equipment in which it is used, and further reduction of the manufacturing cost. In this case, heat distortion can be suppressed by approximating the thermal expansion coefficients of the integrally molded product and the color synthesis optical element assembled therewith. Therefore, since the position of the light modulation device can be held in an appropriate state, pixel shift of the projected image can be avoided, and a high-quality image can be obtained.

  In the optical device of the present invention, the optical device is attached to an optical component casing in which optical components constituting an optical device are arranged along a predetermined optical axis, and at least one of the pedestals has the optical component for the optical component. It is preferable that an attachment portion to be fixed to the housing is formed. Thus, the space around the optical device can be reduced by providing the mounting portion to the optical component casing on the pedestal. Therefore, it is possible to further promote the reduction in size and weight of the optical apparatus in which the optical device is employed.

  In the optical device according to the aspect of the invention, it is preferable that the light modulation device includes a pair of substrates and a light-transmitting dustproof plate fixed to at least one of the pair of substrates. When the optical device is employed in a projector, if such a light-transmitting dustproof plate is provided, even if dust adheres to the surface of the light modulation device, it can be made inconspicuous on the projection surface. Therefore, it is possible to contribute to further improvement in image quality.

  In the method for manufacturing an optical device according to the present invention, a plurality of light modulation devices that modulate a plurality of color lights according to image information for each color light and a color combining optical element that combines the respective color lights modulated by the light modulation device are integrated. A method of manufacturing an optical device, wherein a pedestal fixing step of fixing a pedestal to at least one of a pair of end surfaces intersecting a light beam incident end surface of the color combining optical element, and the plurality of light modulation devices, A step of attaching each of the holding frames, a holding frame attaching step of closely attaching the holding frame to the holding member using an adhesive, and a holding member attaching step of attaching the holding member to the side surface of the base using an adhesive And a step of inserting a spacer coated with an adhesive between the light modulation device and the holding member, and a position adjustment step of adjusting the positions of the plurality of light modulation devices in a state where the adhesive is uncured. And after the position adjusting step, An adhesive curing step for curing the adhesive, and in the position adjusting step, when the predetermined optical axis is the Z axis and the two axes orthogonal to the Z axis are the X axis and the Y axis, the Z axis direction The adjustment of the rotation direction about the X axis and the Y axis is performed via the spacer between the holding frame and the holding member, and the rotation in the X axis direction, the Y axis direction, and the XY plane is performed. The adjustment of the direction is performed between the holding member and the pedestal.

  According to the manufacturing method as described above, the position of the light modulation device in the X-axis direction, the Y-axis direction, and the rotation direction in the XY plane is only the positional relationship between the holding member and the pedestal without using a pin or a spacer. Therefore, the position adjustment of the light modulation device is easy, and the positional deviation of the light modulation device after the position adjustment can be reduced. Therefore, it is possible to contribute to the reduction of the manufacturing cost and the improvement of the image quality of the optical device, and thus the projector in which it is used.

  In this manufacturing method, the adjustment in the Z-axis direction and the rotation direction about the X-axis and the Y-axis is performed by applying an adhesive between the light modulation device and the holding member before the position adjustment step. It is possible to provide a step of inserting the coated spacer, and perform the process between the holding frame and the holding member via the spacer.

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
(1. Main configuration of projector)
1 is an overall perspective view of the projector 1 according to the first embodiment as viewed from above, FIG. 2 is an overall perspective view of the projector 1 as viewed from below, and FIGS. 3 to 5 are perspective views of the inside of the projector 1. FIG. Specifically, FIG. 3 is a diagram in which the upper case 21 of the projector 1 is removed from the state of FIG. 1, and FIG. 4 is a rear side of the shield plate 80, the driver board 90, and the upper housing 472 that are removed from the state of FIG. FIG. 5 is a view in which the optical unit 4 is removed from the state of FIG. These parts 4, 21, 80, 90, and 472 constituting the projector will be described in detail below.

  1 to 5, the projector 1 includes an exterior case 2, a power supply unit 3 accommodated in the exterior case 2, and a planar U-shaped optical unit 4 that is also disposed in the exterior case 2. It has a substantially rectangular parallelepiped shape.

The exterior case 2 includes an upper case 21 and a lower case 23 each made of resin. These cases 21 and 23 are fixed to each other with screws.
The outer case 2 is not limited to resin, but may be made of metal. Further, a part of the outer case can be made of resin, and the other part can be made of metal. For example, the upper case 21 may be made of resin, and the lower case 23 may be made of metal.

The upper case 21 is formed by an upper surface portion 211, a side surface portion 212 provided around the upper surface portion 211, a back surface portion 213, and a front surface portion 214.
On the front side of the upper surface portion 211, a lamp cover 24 is fitted and detachably attached. Further, in the upper surface portion 211, a notch portion 211A where the upper surface portion of the projection lens 46 is exposed is provided on the side of the lamp cover 24 so that the zoom operation and the focus operation of the projection lens 46 can be performed manually via a lever. It has become. An operation panel 25 is provided on the rear side of the notch 211A.
The front part 214 includes a round hole opening 212A continuous with the cutout part 211A of the upper case 21, and a projection lens 46 is disposed corresponding to the round hole opening 212A. In the front portion 214, an exhaust port 212B formed on the lower case 23 side is located on the side opposite to the round hole opening 212A. The exhaust port 212 </ b> B is located on the front side of the internal power supply unit 3. The exhaust port 212B is provided with an exhaust louver 26 that exhausts cooling air away from the image projection area, that is, the left side in FIG. 1 and also has a light shielding function (the exhaust louver 26 is actually It is attached to the lower case 23).

The lower case 23 is formed of a bottom surface portion 231, and a side surface portion 232 and a back surface portion 233 provided around the bottom surface portion 231.
A position adjustment mechanism 27 that adjusts the inclination of the entire projector 1 and aligns the projected image is provided on the front side of the bottom surface portion 231. Further, another position adjusting mechanism 28 for adjusting the inclination of the projector 1 in another direction is provided at one corner on the rear side of the bottom surface portion 231, and a rear foot 231 </ b> A is provided at the other corner. However, the position of the rear foot 231A cannot be adjusted. Further, the bottom surface portion 231 is provided with an intake port 231B for cooling air.
One side surface portion 232 is provided with an attachment portion 232A for rotatably attaching the U-shaped handle 29.

On one side surface of the exterior case 2, the side foot 2 A serving as a foot when the projector 1 is erected with the handle 29 on the side surface portions 212 and 232 of the upper case 21 and the lower case 23. (FIG. 2) is provided.
Further, on the back side of the exterior case 2, an interface part 2B is provided that opens across the back part 213 of the upper case 21 and the back part 233 of the lower case 23, and an interface cover 215 is provided in the interface part 2 B. In addition, an interface board (not shown) on which various connectors are mounted is arranged on the inner side of the interface cover 215. Further, on both the left and right sides of the interface portion 2B, speaker holes 2C and intake ports 2D are provided across the back surface portions 213 and 233, respectively. Of these, the air inlet 2 </ b> D is located on the rear side of the internal power supply unit 3.

As shown in FIG. 4, the power supply unit 3 includes a power supply 31 and a lamp driving circuit (ballast) 32 disposed on the side of the power supply 31.
The power supply 31 supplies power supplied through the power cable to the lamp drive circuit 32, the driver board 90 (FIG. 3), and the like, and includes an inlet connector 33 (FIG. 2) into which the power cable is inserted.
The lamp driving circuit 32 supplies power to the light source lamp 411 of the optical unit 4.

  As shown in FIGS. 4, 6, and 7, the optical unit 4 is a unit that optically processes the light beam emitted from the light source lamp 411 to form an optical image corresponding to the image information. An optical system 41, a color separation optical system 42, a relay optical system 43, an electro-optical device 44, a cross dichroic prism 45 (FIG. 7) as a color synthesis optical system, and a projection lens 46 as a projection optical system are provided.

  The power supply unit 3 and the optical unit 4 are covered with an aluminum shield plate 80 (FIGS. 3 and 5) including the upper and lower sides, thereby preventing leakage of electromagnetic noise from the power supply unit 3 or the like to the outside. It is preventing.

(2. Detailed configuration of optical system)
4 and 7, the integrator illumination optical system 41 is an image of three liquid crystal panels 441 constituting the electro-optical device 44 (respectively indicated as liquid crystal panels 441R, 441G, and 441B for red, green, and blue color lights). This is an optical system for illuminating the formation region substantially uniformly, and includes a light source device 413, a first lens array 418, a second lens array 414 including a UV filter, a polarization conversion element 415, and a first condenser lens 416. , A reflection mirror 424 and a second condenser lens 419.

  Among these, the light source device 413 includes a light source lamp 411 as a radiation light source that emits a radial light beam, and a reflector 412 that reflects the radiation light emitted from the light source lamp 411. As the light source lamp 411, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is often used. A parabolic mirror is used as the reflector 412. In addition to a parabolic mirror, an ellipsoidal mirror may be used together with a collimating lens (concave lens).

  The first lens array 418 has a configuration in which small lenses having a substantially rectangular outline when viewed from the optical axis direction are arranged in a matrix. Each small lens splits the light beam emitted from the light source lamp 411 into a plurality of partial light beams. The contour shape of each small lens is set so as to be almost similar to the shape of the image forming area of the liquid crystal panel 441. For example, if the aspect ratio (ratio of horizontal and vertical dimensions) of the image forming area of the liquid crystal panel 441 is 4: 3, the aspect ratio of each small lens is also set to 4: 3.

  The second lens array 414 has substantially the same configuration as the first lens array 418, and has a configuration in which small lenses are arranged in a matrix. The second lens array 414 has a function of forming an image of each small lens of the first lens array 418 on the liquid crystal panel 441 together with the first condenser lens 416 and the second condenser lens 419.

  The polarization conversion element 415 is disposed between the second lens array 414 and the first condenser lens 416 and is unitized with the second lens array 414. Such a polarization conversion element 415 converts the light from the second lens array 414 into a single type of polarized light, thereby improving the light use efficiency in the electro-optical device 44.

Specifically, each partial light converted into one type of polarized light by the polarization conversion element 415 is finally liquid crystal panels 441R, 441G, 441B of the electro-optical device 44 by the first condenser lens 416 and the second condenser lens 419. It is almost superimposed on top. In a projector using a liquid crystal panel of a type that modulates polarized light, only one type of polarized light can be used. Therefore, almost half of the light from the light source lamp 411 that emits randomly polarized light cannot be used.
Therefore, by using the polarization conversion element 415, the light emitted from the light source lamp 411 is converted into almost one kind of polarized light, and the light use efficiency in the electro-optical device 44 is enhanced. Such a polarization conversion element 415 is introduced in, for example, Japanese Patent Application Laid-Open No. 8-304739.

  The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423, and a plurality of partial light beams emitted from the integrator illumination optical system 41 by the dichroic mirrors 421 and 422 are red, green, and blue. It has a function of separating into three color lights.

  The relay optical system 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 434, and has a function of guiding the color light and blue light separated by the color separation optical system 42 to the liquid crystal panel 441B.

  At this time, the dichroic mirror 421 of the color separation optical system 42 transmits the blue light component and the green light component of the light beam emitted from the integrator illumination optical system 41 and reflects the red light component. The red light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 417, and is aligned in the polarization direction by the polarizing plate 442, and then reaches the liquid crystal panel 441R for red. The field lens 417 converts each partial light beam emitted from the second lens array 414 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 417 provided on the light incident side of the other liquid crystal panels 441G and 441B.

  Of the blue light and green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422, passes through the field lens 417, and is aligned in the polarization direction by the polarizing plate 442, and then is applied to the green liquid crystal panel 441 G. Reach. On the other hand, the blue light passes through the dichroic mirror 422, passes through the relay optical system 43, passes through the field lens 417, and is aligned with the polarizing plate 442 to reach the blue light liquid crystal panel 441B. The reason why the relay optical system 43 is used for blue light is that the optical path length of the blue light is longer than the optical path lengths of the other color lights, thereby preventing a reduction in light use efficiency due to light diffusion or the like. Because. That is, this is to transmit the partial light beam incident on the incident side lens 431 to the field lens 417 as it is.

  The electro-optical device 44 includes liquid crystal panels 441R, 441G, and 441B as three light modulation devices. The liquid crystal panels 441R, 441G, and 441B use, for example, polysilicon TFTs as switching elements. Each color light separated by the color separation optical system 42 is incident on the liquid crystal panels 441R, 441G, and 441B and their luminous fluxes. An optical image is formed by being modulated according to image information by the polarizing plates 442 on the side and the exit side.

  The cross dichroic prism 45 as a color combining optical element forms a color image by combining images modulated for each color light emitted from the three liquid crystal panels 441R, 441G, and 441B. In the cross dichroic prism 45, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in a substantially X shape along the interface of four right-angle prisms. Three color lights are synthesized by the dielectric multilayer film. The color image synthesized by the cross dichroic prism 45 is emitted from the projection lens 46 and enlarged and projected on the screen.

Each of the optical systems 41 to 45 described above is housed in an optical component casing 47 made of synthetic resin as a casing for optical components, as shown in FIGS.
Here, the upper housing 472 and the lower housing 471 are each lightweight and have good thermal conductivity, such as metals such as aluminum, magnesium and titanium, alloys thereof, polycarbonate containing carbon filler, polyphenylene sulfide, liquid crystal resin, etc. Formed of resin.
This optical component casing 47 is a slide type polarizing plate 442 arranged on the light incident side of each of the optical components 414 to 419, 421 to 423, 431 to 434 and the liquid crystal panels 441R, 441G and 441B from above. The lower casing 471 is provided with a groove portion to be fitted into the upper casing 471, and a lid-shaped upper casing 472 that closes the upper opening side of the lower casing 471.
A head portion 49 is formed on the light emission side of the optical component casing 47. The projection lens 46 is fixed to the front side of the head portion 49, and the cross dichroic prism 45 to which the liquid crystal panels 441R, 441G, 441B are attached is fixed to the rear side.

(3. Cooling structure)
The projector 1 of this embodiment includes a panel cooling system A that mainly cools the liquid crystal panels 441R, 441G, and 441B and a lamp cooling system that mainly cools the light source lamp 411, as shown in FIGS. B and a power supply cooling system C for mainly cooling the power supply 31 are provided.

  First, the panel cooling system A will be described with reference to FIGS. In the panel cooling system A, a pair of sirocco fans 51 and 52 disposed on both sides of the projection lens 46 are used. The cooling air sucked from the lower air inlets 231B by the sirocco fans 51, 52 directs the liquid crystal panels 441R, 441G, 441B and the polarizing plates 442 (FIG. 7) on the light beam entrance side and the light exit side thereof from below to above. After cooling, the lower surface of the driver board 90 (FIG. 3) is cooled toward the axial exhaust fan 53 side at the front corner and exhausted from the exhaust port 212B (FIG. 3) on the front side.

  Next, the lamp cooling system B will be described with reference to FIGS. In the lamp cooling system B, a sirocco fan 54 provided on the lower surface of the optical unit 4 is used. The cooling air in the projector 1 attracted by the sirocco fan 54 enters the optical component casing 47 through an opening (not shown) provided in the upper casing 472, and the second lens array 414 (FIG. 7) and polarization conversion. After these elements are cooled through the elements 415 (FIG. 7), they exit from the exhaust side opening 471A of the lower housing 471 and are sucked into the sirocco fan 54 and discharged. The discharged cooling air enters the optical component casing 47 again from the intake side opening 471B of the lower casing 471, enters the light source device 413 (FIG. 7), and cools the light source lamp 411 (FIG. 7). Thereafter, the air flows out of the optical component casing 47 and is exhausted from the exhaust port 212B (FIG. 3) by the axial flow exhaust fan 53.

  Further, the power supply cooling system C will be described with reference to FIG. In the power supply cooling system C, an axial flow intake fan 55 provided behind the power supply 31 is used. The cooling air sucked from the rear side intake port 2D by the axial flow intake fan 55 cools the power source 31 and the lamp drive circuit 32, and then is exhausted by the axial flow exhaust fan 53 in the same manner as the other cooling systems A and B. The air is exhausted from the port 212B (FIG. 3).

(4. Structure of optical device)
Hereinafter, the structure of the optical device will be described in detail with reference to FIGS.
First, as shown in FIG. 8, the optical device includes a cross dichroic prism 45, a base 445 fixed to upper and lower surfaces of the cross dichroic prism 45 (a pair of end surfaces intersecting with a light beam incident end surface), and each liquid crystal panel 441R, 441G, 441B, a holding frame 443 that accommodates the liquid crystal panels 441R, 441G, 441B, and a holding member 446 interposed between the holding frame 443 and the side surface of the base 445.
In FIG. 8, only one liquid crystal panel 441, one holding frame 443, and one holding member 446 are shown to simplify the drawing. These elements 441, 443, 446 are actually arranged on the other two light beam incident end faces of the cross dichroic prism 45.
The same applies to FIG. 9, FIG. 15, and FIG.
Here, the pedestal 445, the holding member 446, and the holding frame 443 are made of an acrylic material, a polycarbonate-containing polycarbonate, polyphenylene sulfide, a liquid crystal resin, or the like, or aluminum, magnesium, titanium, which is lightweight and has good thermal conductivity, or It can be comprised with metals, such as an alloy which made these the main materials. In this embodiment, all are comprised with the magnesium alloy. These elements 445, 446, and 443 can be formed of different materials. However, since the same amount of dimensional change (expansion and shrinkage) due to heat is the same, functional reliability is ensured. High nature. In addition, since these elements expand and contract due to heat, it is possible to reduce the influence on the image quality of the projected image. In consideration of such functional reliability and the influence on the image quality of the projected image, the thermal expansion coefficient of the material of these elements 445, 446 and 443 is as large as that of the glass or the like constituting the cross dichroic prism 45 as much as possible. It is preferably close to the coefficient.

The pedestal 445 is fixed to the upper and lower surfaces of the cross dichroic prism 45, the outer peripheral shape is slightly larger than the cross dichroic prism 45, and the side surface protrudes from the side surface of the cross dichroic prism 45.
Further, as shown in FIG. 9, a concave portion 445A is formed on the side surface of the pedestal 445 across the opposing upper and lower edges, and a tool such as a screwdriver is provided between the holding member 446 and the pedestal 445 to be bonded and fixed. It can be plugged in.
Further, a mounting portion 445B for fixing the optical device to the lower housing 471 is formed on the base 445 fixed to the upper surface of the cross dichroic prism 45.

  As shown in FIG. 13, a liquid crystal panel 441 includes a driving substrate (for example, a substrate on which a plurality of line-shaped electrodes, electrodes constituting pixels, and TFT elements electrically connected therebetween are formed. ) 441A and a counter substrate (for example, a substrate on which a common electrode is formed) 441E, liquid crystal is sealed, and a control cable 441C extends between these glass substrates. On the drive substrate 441A and the counter substrate 441E, a light-transmitting dustproof plate 441D for shifting the position of the panel surface of the liquid crystal panel 441 from the back focus position of the projection lens 46 and making the dust optically attached to the panel surface inconspicuous. Is fixed. As the light transmissive dustproof plate, a material having good thermal conductivity such as sapphire, quartz, or quartz is used. In the present embodiment, the light transmissive dustproof plate 441D is provided, but such a dustproof plate is not essential. Further, the light transmissive dustproof plate 441D may be provided only on one of the drive substrate 441A and the counter substrate 441E. Further, a gap may be provided between the light transmissive dustproof plate 441D and the substrates 441A and 441E. The same applies to the following embodiments. In the drawings other than FIG. 13, the light transmissive dustproof plate 441D is omitted.

As shown in FIG. 13, the holding frame 443 includes a concave frame 444A having a storage portion 444A1 for storing the liquid crystal panels 441R, 441G, and 441B, and each liquid crystal panel 441R engaged with and stored in the concave frame 444A. , 441G and 441B are supported by a support plate 444B. The holding frame 443 holds the outer periphery of the light transmissive dustproof plate 441D fixed to the counter substrate 441E of each liquid crystal panel 441R, 441G, 441B. The liquid crystal panels 441R, 441G, and 441B are stored in the storage portion 444A1 of the holding frame 443. Openings 443C are provided at positions corresponding to the panel surfaces of the stored liquid crystal panels 441R, 441G, 441B, and holes 443D are formed at the four corners. Further, as shown in FIG. 9, the concave frame body 444A and the support plate 444B are fixed to the hooks 444D provided on the left and right sides of the support plate 444B and the hooks provided at the corresponding portions of the concave frame body 444A. This is performed by engaging with the joint portion 444C.
Here, each of the liquid crystal panels 441R, 441G, and 441B is exposed at the opening 443C of the holding frame 443, and this portion becomes an image forming area. That is, each color light R, G, B is introduced into this portion of each liquid crystal panel 441R, 441G, 441B, and an optical image is formed according to image information.
Further, a light shielding film (not shown) is provided on the end surface of the support plate 443B on the light beam exit side to prevent light reflected from the cross dichroic prism 45 from being further reflected to the cross dichroic prism 45 side, and stray light. The contrast is prevented from being lowered.

The holding member 446 holds and fixes the holding frame 443 that accommodates the respective liquid crystal panels 441R, 441G, and 441B. As shown in FIG. 9, the holding plate 446A has a rectangular plate-like body 446A and four corners of the rectangular plate-like body 446A. And a projecting pin 447A. Here, the position of the pin 447A need not be the corner of the rectangular plate-like body 446A. Further, the number of pins 447A is not limited to four, but may be two or more.
The holding member 446 is interposed between the base 445 and the holding frame 443. The end surface of the holding member 446 opposite to the pin 447A is bonded and fixed to the side surface of the base 445. Further, the holding member 446 and the holding frame 443 are bonded and fixed to each other through the pins 447A of the holding member 446 and the holes 443D of the holding frame 443.
In the rectangular plate-like body 446A, a rectangular opening 446B is formed substantially at the center, and a recess 446N is formed over the upper and lower edges. The opening 446B corresponds to the image forming area of each liquid crystal panel 441R, 441G, 441B when the liquid crystal panels 441R, 441G, 441B are mounted. Further, a light shielding film (not shown) is provided on the end surface of the rectangular plate-like body 446 </ b> A on the light emission side, similarly to the holding frame 443.

In addition, an engagement groove 446C is formed so as to surround the opening 446B, and a polarizing film 442 in which a polarizing film is attached to the sapphire substrate using a transparent adhesive so as to engage with the engagement groove 446C. Is fixed by double-sided tape or adhesive.
The pin 447A is formed such that the diameter of the rising portion from the rectangular plate-like body 446A is larger than the hole 443D formed in the holding frame 443. When the liquid crystal panels 441R, 441G, and 441B are attached, , 441G, 441B and a holding member 446 are secured.
When there is no such structure, that is, when the diameter of the pin 447A is formed substantially the same from the proximal end to the distal end, a gap cannot be secured when the holding frame 443 is attached to the holding member 446. The adhesive that fixes the holding frame 443 and the holding member 446 spreads on the end surface of the holding frame 443 due to surface tension, and adheres to the display surface of the liquid crystal panel 441.

(5. Manufacturing method of optical device)
Below, with reference to FIG. 9, the manufacturing method of an optical apparatus is explained in full detail.
(A) First, the base 445 is fixed to the upper and lower surfaces of the cross dichroic prism 45 using an adhesive (base fixing step).
(B) Further, the polarizing plate 442 is fixed by double-sided tape or adhesion so as to engage with the engaging groove 446C of the holding member 446 (polarizing plate fixing step).
(C) The liquid crystal panels 441R, 441G, and 441B are stored in the storage portion 444A1 of the concave frame 444A of the holding frame 443. Thereafter, the support plate 444B of the holding frame 443 is attached from the liquid crystal panel insertion side of the concave frame 444A, and the liquid crystal panels 441R, 441G, 441B are pressed and held. The support plate 444B can be attached to the concave frame 444A by engaging the hook 444D of the support plate 444B with the hook engaging portion 444C of the concave frame 444A (light modulation device holding step). ).
(D) The pins 447A of the holding member 446 are inserted into the holes 443D of the holding frame 443 that accommodates the liquid crystal panels 441R, 441G, and 441B (holding frame mounting step).

(E) The end surface opposite to the pin 447A of the holding member 446 is brought into close contact with the side surface of the base 445 (the light beam incident end surface side of the cross dichroic prism 45) via an adhesive (holding member mounting step). At this time, the holding member 446 is in close contact with the side surface of the pedestal due to the surface tension of the adhesive.
(F) The position of each liquid crystal panel 441R, 441G, 441B is adjusted in a state where the adhesive is uncured (position adjusting step).
(G) After adjusting the position of each liquid crystal panel 441R, 441G, 441B, the adhesive is cured and fixed (adhesive curing step).
The optical device is manufactured by the process procedure as described above.
As the adhesive used in the above manufacturing process, it is preferable to use a thermosetting adhesive or a photo-curing adhesive having good thermal conductivity. As described above, examples of the thermosetting adhesive and the photocuring adhesive having good thermal conductivity include an acrylic or epoxy adhesive mixed with silver palladium. Further, as the photo-curing adhesive, an ultraviolet-curing adhesive that is cured by irradiation with ultraviolet rays is generally known. When one of the members to be bonded to each other is formed of a metal, a thermosetting adhesive is used. When one of the members is formed of a light-transmitting material, a photocurable adhesive is used. Can be shortened. The same applies to other embodiments.
In this embodiment, since the pedestal 445, the holding member 446 and the holding frame 443 are made of a magnesium alloy having excellent thermal conductivity, the adhesive can be cured in a shorter time by using a thermosetting adhesive, It becomes possible to shorten the manufacturing time.

(6. LCD panel position adjustment method)
The position adjustment of the liquid crystal panels 441R, 441G, 441B in the position adjustment step (f) is performed as follows.
First, with respect to the liquid crystal panel 441G facing the projection lens 46 (FIG. 7 and the like), alignment adjustment (adjustment in the X-axis direction, Y-axis direction, and θ-direction) is performed by using the joint surface between the base 445 and the holding member 446 as a sliding surface. The focus adjustment (adjustment in the Z-axis direction, Xθ direction, and Yθ direction) is performed by sliding the holding frame 443 through the joint between the holding frame 443 and the holding member 446, that is, the pin 447A. That is, the alignment adjustment can be performed by moving one of the pedestal 445 and the holding member 446 in the X-axis direction, the Y-axis direction, and the θ-direction while fixing one position. The focus adjustment can be performed by moving one of the holding frame 443 and the holding member 446 in the Z-axis direction, the Xθ direction, and the Yθ direction with one position fixed.
After adjusting the liquid crystal panel 441G to a predetermined position, the adhesive is cured by hot air, hot beam, ultraviolet light, or the like.
Next, the position adjustment and fixing of the liquid crystal panels 441R and 441B are performed in the same manner as described above with reference to the liquid crystal panel 441G whose position adjustment and fixing have been completed.
It is not always necessary to perform the manufacturing of the optical device and the position adjustment of the liquid crystal panel in the above order. For example, when solder is used as the adhesive, each member is mounted without using an adhesive in the manufacturing steps (d) and (e), and after the position adjustment in (f) is completed, the base 445, The holding member 446 and the holding frame 443 may be fixed with solder. The same applies to optical devices of other embodiments manufactured by the same manufacturing method as in this embodiment.

(7. Mounting method of optical device)
The optical device comprising the liquid crystal panels 441R, 441G, 441B and the cross dichroic prism 45 integrated by the method as described above has an upper surface (light beam incident) as shown in FIGS. It is fixed to the mounting portion 473 of the lower housing 471 via the mounting portion 445B of the base 445 fixed to the surface orthogonal to the surface.
As shown in FIG. 9, the attachment portion 445B includes four arm portions 445C extending in four directions in a plan view. As shown in FIG. 11 and FIG. 14, of the round holes 445D provided in the respective arm portions 445C, the two round holes 445D that are substantially on the diagonal line are positioned for positioning provided in the corresponding mounting portions 473. A screw 475 that is screwed into the corresponding mounting portion 473 is inserted into the remaining two round holes 445D that are fitted into the protrusions 474. Further, as shown in FIG. 9, a gripping portion 445E is provided in the central rectangular portion of the mounting portion 445B so that the operator can easily grip the mounting and dismounting.

  On the other hand, as shown in FIGS. 10 and 14, the attachment portion 473 of the lower housing 471 is provided on the upper portion of four cylindrical or prismatic boss portions 476 that extend substantially in the vertical direction of the lower housing 471. Yes. Therefore, in a state where the mounting portion 445B of the base 445 is attached to the mounting portion 473 of the lower housing 471, the liquid crystal panels 441R, 441G, 441B and the cross dichroic prism 45 are suspended from the lower surface side of the mounting portion 445B. And is housed in the optical component housing 47 in a state of slightly floating from the bottom surface of the lower housing 471.

In such a lower housing 471, a head portion 49 for fixing the projection lens 46 is integrally provided on the two boss portions 476 on the projection lens 46 side. The boss portion 476 has a reinforcing function for preventing the head portion 49 from tilting even when the heavy projection lens 46 is fixed to the head portion 49.
A plurality of holding pieces 477 (shown as representative of some holding pieces 477 in FIGS. 4 and 10) are provided on the two boss portions 476 spaced apart from the projection lens 46 side, and are provided as field lenses. 417, a groove for fitting the dichroic mirrors 421 and 422, the incident side lens 431, and the relay lens 433 is formed between a pair of holding pieces 477 that are close to each other. That is, these holding pieces 477 are also reinforced by the boss portion 476 by being formed integrally with the boss portion 476.

  On the other hand, as shown in FIG. 11, the upper housing 472 is provided with a notch opening 472A at portions corresponding to the liquid crystal panels 441R, 441G, 441B (FIG. 8) and the cross dichroic prism 45 (FIG. 8). The attachment portion 473 of the body 471 is also exposed from the notch opening 472A. That is, the liquid crystal panels 441R, 441G, 441B and the cross dichroic prism 45 shown in FIG. 8 and the like are fixed to the base 445 provided with the mounting portion 445B in advance, so that the upper housing 472 is attached to the lower housing 471. Even in this state, the mounting portion 445B of the base 445 can be attached to and detached from the mounting portion 473.

  Particularly, the mounting portion 473 provided on the boss portion 476 integral with the head portion 49 is located above the central axis XX of the projection lens 46 shown in FIG. Therefore, as shown in FIG. 14, the two arms 445C of the mounting portion 445B overlap the outer periphery of the end 46A of the projection lens 46 protruding from the head portion 49 toward the cross dichroic prism 45 in a plan view. , So that there is no substantial interference with each other.

(8. Cooling structure of optical device)
Hereinafter, the cooling structure of the optical device fixed to the optical component casing 47 by the above mounting method will be described in detail.
As shown in FIGS. 6 and 10 to 13, the bottom surface of the lower housing 471 is provided with intake side openings 471 C at three locations corresponding to the liquid crystal panels 441 R, 441 G, and 441 B, and from these intake side openings 471 C. The liquid crystal panels 441R, 441G, and 441B and the polarizing plates 442 arranged on the light incident side and the emission side are cooled by the cooling air in the panel cooling system A (FIGS. 2 and 5) flowing into the optical component casing 47. Is done.
At this time, a plate-like rectifying plate 478 having a substantially triangular plane is provided on the lower surface of the lower casing 471, and a pair of upright pieces 478A (total of six pieces) provided on the rectifying plate 478 are provided from the intake side opening 471C. It protrudes upward. In FIG. 11, the rising piece 478A is indicated by a two-dot chain line. By these rising pieces 478A, the flow of cooling air for cooling the liquid crystal panels 441R, 441G, 441B and the polarizing plate 442 is adjusted from the bottom to the top.

  Further, in FIG. 11 to FIG. 13, among the peripheral edges of the intake side opening 471 </ b> C, on one side that is on the cross dichroic prism 45 side and parallel to the light beam incident surface, a standing rising from the bottom surface of the lower housing 471 is provided. The upper portion 471D is located, and the upper end portion thereof is close to the lower end surface of the pedestal 445 fixed to the lower surface of the cross dichroic prism 45, and cooling air from below to above is supplied to the bottom surface of the lower housing 471. In addition, it is difficult to leak from the gap between the cross dichroic prism 45 and flows into the gap between the liquid crystal panels 441R, 441G, 441B and the cross dichroic prism 45.

(9. Effects of the first embodiment)
According to this embodiment, there are the following effects.
(1) Pins 447A for fixing the holding frame 443 to the holding member 446 are provided, and pins and spacers configured as independent parts are not used unlike the conventional POP structure, so the number of parts is small. . Further, the structure is simple and the manufacture is easy. Therefore, it is possible to contribute to the downsizing of the optical device, and consequently the projector, and the reduction of the manufacturing cost.

(2) Unlike the conventional POP structure, the liquid crystal panels 441R, 441G, and 441B are not fixed to the light beam incident end face of the cross dichroic prism, but on the side surface of the base 445 fixed to the upper and lower surfaces of the cross dichroic prism 45. Since it is fixed, the size of the light beam incident end face of the cross dichroic prism 45 can be suppressed to be substantially the same as or slightly larger than the image forming area of the liquid crystal panels 441R, 441G, 441B. Therefore, the size of the cross dichroic prism 45 can be reduced, thereby reducing the size of the optical device, and thus the projector, and the manufacturing cost.

(3) Further, as in the prior art, the positions of the liquid crystal panels 441R, 441G, and 441B are not defined by the position of the light beam incident end surface of the cross dichroic prism 45, but are defined by the side surface of the base 445. . Therefore, the size of the cross dichroic prism 45 can be reduced accordingly. As a result, it is possible to reduce the size and the manufacturing cost of the optical device, and thus the projector. Furthermore, since the back focus of the projection lens 46 can be shortened, more light can be swallowed by the projection lens 46, and a bright projection image can be obtained.

(4) Further, the liquid crystal panels 441R, 441G, and 441B are not fixed to the light flux incident end face of the cross dichroic prism, but are fixed to the side surfaces of the base 445 fixed to the upper and lower surfaces of the cross dichroic prism 45. If the liquid crystal panels 441R, 441G, and 441B need to be replaced after manufacturing, the light flux incident end face of the cross dichroic prism 45 will not be damaged even if they are removed. Further, it is not necessary to scrape off the adhesive fixed to the light beam incident end face. Therefore, it is possible to contribute to the reduction of the manufacturing cost of the optical device, and thus the projector, and the improvement of after-sales service.

(5) Further, since the positions of the liquid crystal panels 441R, 441G, and 441B are determined only by the positional relationship between the holding member 446 and the base 445 without using pins or spacers, the position adjustment of the liquid crystal panels 441R, 441G, and 441B can be performed. It is easy, and the positional deviation of the liquid crystal panels 441R, 441G, 441B after the position adjustment can be reduced. Therefore, it is possible to contribute to the reduction of the manufacturing cost of the optical device and the projector and the improvement of the image quality.

(6) The liquid crystal panels 441R and 441G are fixed by fixing the polarizing plates 442 positioned on the light emission side of the liquid crystal panels 441R, 441G, and 441B so as to engage with the engaging grooves 446C of the holding member 446. 441B and the cross dichroic prism 45 need not be provided with a separate mechanism for holding the polarizing plate. Therefore, it is possible to promote cost reduction and reduction in size and weight of the optical device, and thus the projector. A phase difference plate (for example, a quarter wavelength plate, a half wavelength plate, or the like) or an optical compensation plate (for example, Fuji) is used in the engagement groove 446C instead of the polarizing plate 442 or together with the polarizing plate 442. You may make it fix "Fuji WV Film wide view A etc." (brand name)) which a photographic film sells.

(7) At the time of manufacture, the recess 445A is provided on the side surface of the base 445 to which the holding member 446 is bonded and fixed, and the recess 446N is provided on the rectangular plate-like body 446A of the holding member 446. In addition, when it is necessary to replace the liquid crystal panels 441R, 441G, and 441B due to some trouble that occurs after manufacturing, these can be easily removed. That is, since a tool such as a screwdriver can be inserted into the recesses 445A and 446N, the base 445 and the holding member 446, and the holding member 446 and the holding frame 443 can be easily peeled off. Therefore, it is possible to contribute to further reduction in the manufacturing cost of the optical device, and thus the projector, and improvement of after-sales serviceability.

(8) Since the outer peripheral shape of the pedestal 445 is larger than the outer peripheral shape of the cross dichroic prism 45, and the side surface of the pedestal 445 protrudes from the side surface of the cross dichroic prism 45, the holding member 446 is heated on the side surface of the pedestal 445. When the adhesive is fixed by using a curing adhesive or a light curing adhesive, even if the adhesive overflows from the joint surface, the overflowing adhesive can be received at the protruding portion. Therefore, it is possible to prevent the adhesive from leaking to the light beam incident end face of the cross dichroic prism 45. Therefore, it is possible to contribute to further improvement of the image quality of the projector.

(9) Since the mounting portion 445B for fixing the optical device including the liquid crystal panels 441R, 441G, and 441B and the cross dichroic prism 45 to the lower housing 471 is integrally formed on the base 445, the peripheral portion of the optical device Space can be reduced. Therefore, it is possible to promote the reduction in size and weight of the projector.

(10) Since the attachment portion 445B is attached to the attachment portion 473 on the top of the boss portion 476 on the near side in the attaching / detaching direction with respect to the optical device, the screw 475 can be removed when replacing the optical component. There is no need to insert a screwdriver for tightening again into the optical component casing 47. Therefore, there is no fear of damaging the field lens 417 and the like housed in the optical component casing 47 with a driver, and the replacement work is easy. Further, since the mounting portion 445B is on the near side, the arm portion 445C of the mounting portion 445B extending in all directions does not collide with the field lens 417 in the optical component casing 47 or the like in the replacement work. Also in this respect, the replacement work is easy. Therefore, it is possible to contribute to the reduction of the manufacturing cost of the optical device, and thus the projector, and the improvement of after-sales service.

(11) The holding frame 443 includes a concave frame 444A that accommodates the liquid crystal panels 441R, 441G, and 441B, and a support plate 444B that presses and fixes the accommodated liquid crystal panels 441R, 441G, and 441B. Therefore, the liquid crystal panels 441R, 441G, and 441B can be easily housed and fixed, and the liquid crystal panels 441R, 441G, and 441B can be stably held and fixed.

(12) Since the light-transmitting dustproof plates 441D are provided on the liquid crystal panels 441R, 441G, and 441B, even if dust adheres to the surfaces of the liquid crystal panels 441R, 441G, and 441B, they are less noticeable on the projection screen. be able to. Therefore, it is possible to contribute to improvement in image quality.

(13) Since the light shielding film is provided on the light emission end face side of the holding frame 443 and the holding member 446, the light reflected from the cross dichroic prism 45 is prevented from being further reflected to the cross dichroic prism 45 side, and stray light It is possible to prevent the contrast from being lowered. Therefore, it is possible to contribute to improvement in image quality.
(14) Since the pedestal 445, the holding member 446, and the holding frame 443 are made of the same material (magnesium alloy), the amount of dimensional change (expansion and contraction) due to heat is the same, so that the functional reliability is high. In addition, since these elements expand and contract due to heat, it is possible to reduce the influence on the image quality of the projected image.

(15) Since the boss portion 476 on the projection lens 46 side is formed integrally with the head portion 49, the head portion 49 can be reinforced by the boss portion 476. Falling down by fixing can be prevented. Accordingly, it is possible to further reduce the size of the optical component casing 47 and, consequently, the optical unit 4.
(16) Further, the optical components such as the field lens 417, the dichroic mirrors 421 and 422, the incident side lens 431, the relay lens 433, and the polarizing plate 442 disposed on the light incident side of each liquid crystal panel 441R, 441G, 441B are held. Since the holding piece 477 is also reinforced by being integrally provided on the boss portion 476 on the side away from the projection lens 46, the thickness of the holding piece 477 and its surroundings can be reduced. Miniaturization can be promoted.

(17) The mounting portions 473 on the boss portion 476 integral with the head portion 49 are located on both sides in the radial direction of the projection lens 46 and spaced upward from the central axis XX of the projection lens 46 (central axis) Since the arm portion 445C of the mounting portion 445B and the end portion 46A of the projection lens 46 projecting through the head portion 49 do not interfere with each other. The width and thickness of the arm portion 445C can be increased. Therefore, the support strength of the liquid crystal panels 441R, 441G, 441B and the cross dichroic prism 45 can be improved.
(18) Since the end 46A of the projection lens 46 protrudes from the head 49 and is closer to the cross dichroic prism 45, the back focus of the projection lens 46 can be shortened. Therefore, a lot of light can be swallowed by the projection lens 46, and a bright projection image can be obtained.

(19) Alignment adjustment (adjustment in the X-axis direction, Y-axis direction, and θ direction) is performed using the joint surface of the pedestal 445 and the holding member 446 as a sliding surface, and focus adjustment (Z-axis direction, Xθ direction, Yθ) The adjustment of the direction is performed by sliding the holding frame 443 through the joint portion of the holding frame 443 and the holding member 446, that is, the pin 447A. Accordingly, the positions of the liquid crystal panels 441R, 441G, and 441B are determined only by the positional relationship between the holding member 446 and the pedestal 445 without using pins or spacers, so that the position adjustment of the liquid crystal panels 441R, 441G, and 441B is easy. Further, it is possible to reduce the positional deviation after the position adjustment. Therefore, it is possible to contribute to the reduction of the manufacturing cost of the optical device and the projector and the improvement of the image quality.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the optical device according to the first embodiment, the holding member 446 includes pins 447A that protrude from the four corners of the rectangular plate-like body 446A. On the other hand, the optical device according to the second embodiment is different in that the holding member 446 includes an upright piece 447B having a substantially L-shaped front surface as shown in FIG. Other configurations and manufacturing methods are the same as those in the first embodiment.
Specifically, the upright pieces 447B are located at the four corners of the rectangular plate-like body 446A and project along the end edges of the rectangular plate-like body 446A to accommodate the liquid crystal panels 441R, 441G, 441B. The outer periphery of the holding frame 443 to be held is configured to be held. And the standing piece 447B and the end surface of liquid crystal panel 441R, 441G, 441B are adhere | attached with a thermosetting adhesive or a photocuring adhesive. Here, the position of the standing piece 447B does not have to be the corner of the rectangular plate-like body 446A. The number of upright pieces 447B is not limited to four, and may be two or more.

According to the second embodiment, the upright piece 447B for fixing the holding frame 443 to the holding member 446 is provided, and a pin or spacer configured as an independent component as in the conventional POP structure. Therefore, the same effect as (1) described in the description of the first embodiment can be obtained. Moreover, it is possible to obtain the same effects as the above (2) to (19) described in the description of the first embodiment.
In addition, since the standing pieces 447B are formed at the four corners of the rectangular plate-like body 446A, the influence of the external force is distributed to the four standing pieces, and stable holding can be performed.
Moreover, since the shape of such upright piece 447B can be easily manufactured by sheet metal processing and mold forming, it leads to cost reduction.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the optical device according to the first embodiment, the holding member 446 includes pins 447A that protrude from the four corners of the rectangular plate-like body 446A. On the other hand, the optical device according to the third embodiment is different in that the holding member 446 includes an upright piece 447C having a substantially L-shaped front surface, as shown in FIG. Other configurations and manufacturing methods are the same as those in the first embodiment.
Specifically, the upright pieces 447C are located at the four corners of the rectangular plate-like body 446A and project along the end edges of the rectangular plate-like body 446A to accommodate the liquid crystal panels 441R, 441G, 441B. The outer periphery of the holding frame 443 to be held is configured to be held. The standing pieces 447C are provided along a pair of parallel sides of the rectangular plate-like body 446A, and the pair of parallel sides of the standing piece 447C are the same as the pair of sides of the rectangular plate-like body 446A. It has a length. And the standing piece 447C and the end surface of liquid crystal panel 441R, 441G, 441B are adhere | attached with a thermosetting adhesive or a photocuring adhesive.

According to the third embodiment, the upright piece 447C for fixing the holding frame 443 to the holding member 446 is provided, and a pin or spacer configured as an independent component as in the conventional POP structure. Therefore, the same effect as (1) described in the description of the first embodiment can be obtained. Moreover, it is possible to obtain the same effects as the above (2) to (19) described in the description of the first embodiment.
Moreover, since the shape of the upright piece 447C can be easily manufactured by sheet metal processing and mold forming, it leads to cost reduction.
Further, since the pair of parallel sides of the upright piece 447C has the same length as the side of the rectangular plate-like body 446A, light leaking from between the holding member 446 and the holding frame 443 can be blocked. it can. In other words, the standing piece 447C can prevent the light leaking in the optical device from being swallowed into the projection lens 46, thereby reducing the contrast of the projected image and blurring the image. Can be obtained.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the first embodiment, the pedestal 445 is fixed to the upper and lower surfaces of the cross dichroic prism 45 (both the pair of end surfaces intersecting with the light incident end surface), and the holding member 446 is bonded and fixed to the side surface of the pedestal 445. Further, the polarizing plate 442 is fixed to the engaging groove 446C of the holding member 446 with a double-sided tape or an adhesive.
On the other hand, in the fourth embodiment, the holding member 446 is bonded and fixed to the light beam incident side end surface of the cross dichroic prism 45, and the pair of the base 445 intersects the light beam incident end surface of the cross dichroic prism 45. It is provided only on one of the end faces. Further, the polarizing plate 442 is fixed to the light beam incident end face of the cross dichroic prism 45 with a double-sided tape or an adhesive.

Specifically, as shown in FIG. 17, the holding member 446 includes a rectangular plate-like body 446A and pins 447A protruding from the four corners of the rectangular plate-like body 446A.
In the rectangular plate-like body 446A, rectangular openings 446B are formed corresponding to the image forming areas of the respective liquid crystal panels 441R, 441G, 441B. Cutout portions 446L for absorbing a difference in hot behavior are formed on the upper and lower edges of. Furthermore, support surfaces 446M are formed on the left and right edges so that an optical compensator (not shown) such as “Fuji WV Film Wide View A (trade name)” sold by Fuji Photo Film can be attached. Yes. By installing such an optical compensator, the birefringence generated in the liquid crystal panels 441R, 441G, and 441B is compensated and the retardation is minimized, thereby enabling a wide viewing angle and a high contrast ratio. Can do.

Further, the polarizing plate 442 is fixed to a substantially central portion of the light beam incident end face of the cross dichroic prism 45.
In the first embodiment, the holding member 446 is made of a magnesium alloy. However, in the present embodiment, a light-transmitting resin is used. An example of such a light transmissive resin is an acrylic material. However, the holding frame 443 may be formed of other materials, for example, a resin such as polycarbonate, polyphenylene sulfide, liquid crystal resin, or the like containing carbon filler, or aluminum, magnesium, titanium having a light weight and good thermal conductivity. Alternatively, it can be made of a metal such as an alloy containing these as main materials.
Configurations other than those described above are the same as in the first embodiment.

Next, with reference to FIG. 17, a method for manufacturing the optical device according to the present embodiment will be described in detail.
(a) First, the base 445 is fixed to the upper surface of the cross dichroic prism 45 using an adhesive (base fixing step).
(b-1) Further, the polarizing plate 442 is fixed to the substantially central portion of the light beam incident end face of the cross dichroic prism 45 using a double-sided tape or an adhesive (polarizing plate fixing step).
(b-2) Further, the optical compensation plate is held and fixed using a double-sided tape or an adhesive so as to engage with the support surface 446M of the holding member 446.
(C) The liquid crystal panels 441R, 441G, and 441B are stored in the storage portion 444A1 of the concave frame 444A of the holding frame 443. Thereafter, the support plate 444B of the holding frame 443 is attached from the liquid crystal panel insertion side of the concave frame 444A, and the liquid crystal panels 441R, 441G, 441B are pressed and held. The support plate 444B can be attached to the concave frame 444A by engaging the hook 444D of the support plate 444B with the hook engaging portion 444C of the concave frame 444A (light modulation device holding step). ).

(d) The pins 447A of the holding member 446 are inserted together with the adhesive into the holes 443D of the holding frame 443 that accommodates the liquid crystal panels 441R, 441G, 441B (holding frame mounting step).
(e) Adhesive is applied to the light beam incident end face of the cross dichroic prism 45 on the end face opposite to the pin 447A of the holding member 446 and is brought into close contact with the light flux incident end face of the cross dichroic prism 45 (holding member mounting step). . At this time, the holding member 446 is in close contact with the light beam incident end face of the cross dichroic prism 45 due to the surface tension of the adhesive.
(f) The positions of the liquid crystal panels 441R, 441G, and 441B are adjusted in a state where the adhesive is uncured (position adjusting step).
(g) After adjusting the positions of the liquid crystal panels 441R, 441G, and 441B, the adhesive is cured (adhesive curing step).
In this embodiment, since the holding member 446 is formed of a light-transmitting resin, the use of a light curable adhesive such as an ultraviolet curable adhesive can cure the adhesive in a shorter time, and the manufacturing time can be reduced. It is possible to shorten it.

The position adjustment of each of the liquid crystal panels 441R, 441G, 441B in the position adjustment step (f) is performed as follows.
First, with respect to the liquid crystal panel 441G facing the projection lens 46, alignment adjustment (adjustment in the X-axis direction, Y-axis direction, and θ-direction) is performed by using the joint surface between the light beam incident end surface of the cross dichroic prism 45 and the holding member 446 as a sliding surface. The focus adjustment (adjustment in the Z-axis direction, the Xθ direction, and the Yθ direction) is performed by sliding through the joint surface between the holding frame 443 and the holding member 446, that is, the pin 447A. That is, the alignment adjustment can be performed by moving one of the cross dichroic prism 45 and the holding member 446 in the X-axis direction, the Y-axis direction, and the θ-direction while fixing one position. The focus adjustment can be performed by moving one of the holding frame 443 and the holding member 446 in the Z-axis direction, the Xθ direction, and the Yθ direction with one position fixed.

After adjusting the liquid crystal panel 441G to a predetermined position, the adhesive is cured by hot air, hot beam, ultraviolet light, or the like. Note that in the case where the adhesive is cured by light such as ultraviolet rays, the adhesive on the joint surface between the holding frame 443 and the holding member 446 may be cured by irradiating light from the tip of the pin 447A of the holding member 446. Further, the adhesive on the joint surface between the light beam incident end face of the cross dichroic prism 45 and the holding member 446 is cured by irradiating light from six locations on the outer peripheral portion of the bottom surface side (the side opposite to the base 445) of the cross dichroic prism 45. Good to do by.
Next, the position adjustment and fixing of the liquid crystal panels 441R and 441B are performed in the same manner as described above with reference to the liquid crystal panel 441G whose position adjustment and fixing have been completed.

According to such 4th Embodiment, there exist the following effects.
A pin 447A for fixing the holding frame 443 to the holding member 446 is provided, and pins and spacers configured as independent parts are not used unlike the conventional POP structure. The same effect as described in (1) can be obtained.
The alignment adjustment (adjustment in the X-axis direction, Y-axis direction, and θ-direction) is performed by using the joint surface between the light beam incident end face of the cross dichroic prism 45 and the holding member 446 as a sliding surface, and focus adjustment (Z-axis direction, Adjustment in the Xθ direction and the Yθ direction) is performed by sliding the holding frame 443 through the joint portion of the holding frame 443 and the holding member 446, that is, the pin 447A. Therefore, the same effect as (19) described in the description of the first embodiment can be obtained.

In addition, it is possible to obtain the same effects as the above (5), (9) to (13), and (15) to (18) described in the description of the first embodiment.
Furthermore, in this embodiment, since the holding member 446 is made of resin, the holding member 446 can be easily manufactured by injection molding or the like, leading to a significant cost reduction. In addition, the weight of the holding member 446 can be reduced, and there is an effect that the weight reduction of the optical device, and thus the projector, can be promoted. In the three embodiments described above and other embodiments described below, the same effect can be obtained if the holding member 446 is made of resin.
Furthermore, in this embodiment, since the holding member 446 is formed of a light-transmitting material, it is easy to fix these by using a photo-curing adhesive for fixing the holding member 446 and other members. Can be done. Therefore, it is possible to improve the manufacturing efficiency of the optical device, and thus the optical equipment in which it is used. In the three embodiments described above and other embodiments described below, the same effect can be obtained if the holding member 446 is made of a light-transmitting material.

  Furthermore, since the notch 446L for absorbing the difference in hot behavior is formed in the rectangular plate-like body 446A constituting the holding member 446, even if the holding member 446 is stressed by heat, The deformation of the outer shape can be reduced. Therefore, it is possible to avoid misalignment of the liquid crystal panels 441R, 441G, and 441B due to heat and hold the liquid crystal panels 441R, 441G, and 441B at appropriate positions. Therefore, it is possible to avoid pixel misalignment of the projected image and obtain a high quality image. It becomes possible. In the above-described three embodiments, a similar effect can be obtained by forming a notch for absorbing a hot behavior difference in the rectangular plate-like body 446A.

  Furthermore, since the holding member 446 includes a support surface 446M for fixing the optical compensation plate, the optical compensation plate is disposed between the liquid crystal panels 441R, 441G, and 441B and the cross dichroic prism 45. No fixed structure is required. Therefore, it is possible to promote cost reduction and reduction in size and weight of the optical device, and thus the projector. The optical element fixed to the support surface 446M is not limited to the optical compensation plate, but includes a polarizing plate, a retardation plate (a quarter wavelength plate, a half wavelength plate, etc.), a condenser lens, and the like. It may be fixed. In this embodiment, the holding member 446 is made of resin. However, if the holding member 446 is made of a material having a relatively high thermal conductivity such as a metal, the heat of the optical element fixed to the support surface 446M. Can be efficiently released through the holding member 446. Therefore, it is possible to prevent deterioration of the optical element due to heat, and it is possible to contribute to the improvement of the image quality of the projector.

Furthermore, since an optical compensator is provided on the light exit side of the liquid crystal panels 441R, 441G, and 441B, it is possible to obtain a projected image with a wide viewing angle and high contrast. In the three embodiments described above and other embodiments described below, the same effect can be obtained by providing an optical compensator on the light exit side of the liquid crystal panels 441R, 441G, 441B. is there.
Instead of the holding member 446 of the present embodiment, a holding member 446 (see FIGS. 9, 15, and 16) as in the first to third embodiments is used to attach the polarizing plate 442 and the like to the holding member 446. The engagement groove 446C (see FIGS. 9, 15, and 16) may be fixed. In this case, in this embodiment, it is possible to obtain the effect obtained based on the holding member 446 of the first to third embodiments instead of the effect obtained based on the holding member 446. Conversely, instead of the holding member 446 of the first to third embodiments, an optical compensator or the like may be fixed to the support surface 446M using a holding member 446 as in this embodiment. In this case, in the first to third embodiments, the effect obtained based on the holding member 446 of this embodiment is used instead of the effect obtained based on the holding member 446 used in these optical devices. It is possible to obtain.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described.
In the following description, the same structure and the same members as those of the fourth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the fourth embodiment, the polarizing plate 442 is directly fixed to the light flux incident end surface of the cross dichroic prism 45 using a double-sided tape or an adhesive, and the rectangular plate-like body 446A of the holding member 446 is optically attached to the left and right edges. The support surface 446M was formed so that the compensation plate could be attached.
In contrast, in the fifth embodiment, the holding member 446 is provided with two sets of support surfaces 446M and 446M1, and the polarizing plate 442 and the optical compensator are fixed to the support surfaces 446M and 446M1. However, this is different from the fourth embodiment. Other configurations and manufacturing methods are the same as those in the fourth embodiment.

Specifically, as shown in FIG. 18, the rectangular plate-like body 446A of the holding member 446 has a first support surface 446M and a second support surface 446M1 formed on the left and right edges and the upper and lower edges, respectively. Yes. The first support surface 446M and the second support surface 446M1 are formed so as to have different height dimensions (out-of-plane direction positions) from the rectangular plate-like body 446A.
Here, the polarizing plate 442 is fixed to the first support surface 446M with a double-sided tape or an adhesive, and the optical compensation plate 450 is similarly fixed to the second support surface 446M1 with a double-sided tape or an adhesive. . Since the heights of the support surface 446M and the support surface 446M1 are different from each other, the polarizing plate 442 and the optical compensation plate 450 are fixed without interfering with each other.

According to such 5th Embodiment, there exist the following effects other than the effect similar to 4th Embodiment.
Since the holding member 446 includes two types of support surfaces 446M and 446M1 having different positions in the out-of-plane direction, the two types of optical elements can be fixed without interfering with each other without providing a fixing mechanism using separate members. Is possible. Therefore, it is possible to further promote cost reduction and reduction in size and weight of the projector. The optical elements fixed to the support surfaces 446M and M1 are not limited to the optical compensation plate and the polarizing plate, but are a retardation plate (a quarter wavelength plate, a half wavelength plate, etc.), a condenser lens, or the like. There may be.
As the holding member 446 of the first to third embodiments, a holding member 446 as in this embodiment may be used, and an optical compensation plate or the like may be fixed to the support surface 446M. In this case, in the first to third embodiments, the effect obtained based on the holding member 446 of this embodiment is used instead of the effect obtained based on the holding member 446 used in these optical devices. It is possible to obtain.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the optical device according to the first embodiment, the pedestal 445 is fixed to the upper and lower surfaces of the cross dichroic prism 45 (both the pair of end surfaces intersecting the light beam incident end surface), and the holding member is bonded and fixed to the side surface of the pedestal 445.
The cross dichroic prism 45 is suspended and fixed to the lower housing 471 via a base 445 fixed to the upper surface.
Further, the holding member 446 and the holding frame 443 are bonded and fixed to each other via a pin 447A provided in the holding member 446 and a hole 443D provided in the holding frame 443.
Further, the polarizing plate 442 is fixed to the engaging groove 446C of the holding member 446 with a double-sided tape or an adhesive.

On the other hand, in the sixth embodiment, the pedestal 445 is fixed only to the lower surface of the cross dichroic prism 45, and the cross dichroic prism 45 is fixed to the lower housing 471 via the pedestal 445 fixed to the lower surface. ing.
The holding member 446 is directly bonded and fixed to the light beam incident end face of the cross dichroic prism 45, and the holding frame 443 is bonded and fixed to the holding member 446 via a wedge-shaped spacer 448A.
Further, the polarizing plate 442 is fixed to the light beam incident end face of the cross dichroic prism 45 with a double-sided tape or an adhesive.
Other configurations are the same as those in the first embodiment.

  Specifically, FIG. 19 is a perspective view showing the attachment state of the liquid crystal panels 441R, 441G, 441B and the cross dichroic prism 45 according to the sixth embodiment, and FIG. 20 is an exploded view thereof. Here, the liquid crystal panels 441R, 441G, and 441B are attached to the cross dichroic prism 45 mounted and fixed on the base 445 using the holding frame 443, the holding member 446, and the wedge-shaped spacer 448A.

  The holding frame 443 has a slightly different appearance from the holding frame 443 (FIG. 9 and the like) of the first embodiment, but the basic configuration is that a light shielding film is provided on the end surface of the support plate 443B on the light beam emission side. The points are the same as those described in the first embodiment.

  The holding member 446 holds the holding frame 443 in which the liquid crystal panels 441R, 441G, and 441B are stored and held. The holding member 446 is fixed to the light beam incident end face of the cross dichroic prism 45. Further, the holding member 446 includes an opening 446 </ b> B at a substantially center. The opening 446B corresponds to the image forming area of each liquid crystal panel 441R, 441G, 441B when the liquid crystal panels 441R, 441G, 441B are mounted. Similar to the holding frame 443, a light shielding film (not shown) is provided on the end surface on the light beam emission side of the holding member 446.

  On the light incident side of the holding member 446, a standing piece 446D formed so as to cover the side edge of the holding frame 443 and a support piece 446K that supports the light emission side surface of the holding frame 443 are formed. In addition, convex portions 446F are provided on both the left and right sides of the light emission side surface. This convex portion forms a partial gap between the cross dichroic prism 45 and the holding member 446. The gap forms an air path for cooling the optical elements such as the liquid crystal panels 441R, 441G, and 441B and polarizing plates disposed in the periphery thereof.

  Further, when it is necessary to replace the liquid crystal panels 441R, 441G, and 441B at the time of manufacture or after manufacture, the holding member 446 and the cross dichroic prism 45 may be peeled off by inserting a tool such as a screwdriver into the gap. Is possible. Joint surfaces 446G to the cross dichroic prism 45 are provided at the upper and lower ends of the convex portion 446F. The protruding height of the upright piece 446D is substantially equal to the thickness of the holding frame 443, and the length in the height direction of the upright piece 446D is substantially equal to the height of the holding frame 443. Note that the inner interval of the upright pieces 446 </ b> D is slightly wider than the width of the holding frame 443. A focus adjustment clearance is provided between the light emission side surface of the holding frame 443 and the light incident side surface of the holding member 446. Further, an inclined surface 446E is formed inside the standing piece 446D of the holding member 446, and a wedge-shaped spacer 448A for fixing the holding frame 443 and the holding member 446 is inserted between the inclined surface 446E and the holding frame 443. It can be done. The slope 446E is formed symmetrically on the upper and lower ends of the left and right upright pieces 446D.

The wedge-shaped spacer 448A is used for positioning the liquid crystal panels 441R, 441G, and 441B and fixing the holding frame 443 and the holding member 446. Here, four wedge-shaped spacers 448A are used. As with the base 445, the holding member 446, and the holding frame 443, the wedge-shaped spacer 448A is made of an acrylic material, a polycarbonate resin containing carbon filler, polyphenylene sulfide, a liquid crystal resin, or the like. , Titanium, or an alloy such as an alloy containing these as a main material. Since the wedge-shaped spacer 448A is used for adhesion between the holding frame 443 and the holding member 446, considering the dimensional change due to heat, a material having a thermal expansion coefficient close to that of the holding frame 443 or the holding member 446, or the holding frame A material having a thermal expansion coefficient between 443 and the holding member 446 is preferably used. In particular, it is preferable to use the same material for the holding frame 443, the holding member 446, and the spacer 448A. Moreover, it is preferable that the thermal expansion coefficient of the material constituting these elements 443, 446, and 448A is as close as possible to the glass constituting the cross dichroic prism 45.
The pedestal 445 has a cross dichroic prism 45 placed on and fixed to the center thereof. The pedestal 445 is fixed to the lower housing 471 (FIG. 6) with screws or the like.

Next, a first manufacturing method of the optical device according to the present embodiment will be described.
(A) First, the polarizing plate 442 is fixed to the cross dichroic prism 45 (polarizing plate fixing step).
(B) The cross dichroic prism 45 to which the polarizing plate 442 is fixed is fixed to the center of the pedestal 445 (pedestal fixing step).

(C) The liquid crystal panels 441R, 441G, and 441B are housed in the concave frame body 444A of the holding frame 443. Thereafter, the support plate 444B of the holding frame 443 is attached from the liquid crystal panel insertion side of the concave frame 444A, and the liquid crystal panels 441R, 441G, 441B are pressed and held. The support plate 444B can be attached to the concave frame 444A by engaging the hook 444D of the support plate 444B with the hook engaging portion 444C of the concave frame 444A (light modulation device holding step). ).

(D) Subsequently, the holding frame 443 that stores and holds the liquid crystal panels 441R, 441G, and 441B is stored between the left and right standing pieces 446D of the holding member 446, and is brought into contact with the support piece 446K (holding frame). Mounting process).
(E-1) Further, the bonding surface 446G of the holding member 446 is brought into close contact with the light flux incident end face of the cross dichroic prism 45 via an adhesive (holding member mounting step). At this time, the holding member 446 is in close contact with the light beam incident end face of the cross dichroic prism 45 due to the surface tension of the adhesive.
(E-2) A wedge-shaped spacer 448A coated with an adhesive is inserted between the slope 446E formed on the inner surface of the upright piece 446D and the outer peripheral surface 443E of the holding frame 443 (spacer mounting step). At this time, the spacer 448A is in close contact with the inclined surface 446E and the outer peripheral surface 443E of the holding frame 443 due to the surface tension of the adhesive.
(F) Further, the positions of the liquid crystal panels 441R, 441G, and 441B are adjusted in a state where the adhesive on the joining surface of the holding member 446 and the cross dichroic prism 45 and the adhesive applied to the wedge-shaped spacer are uncured ( Position adjustment step).
(G) After adjusting the position of the liquid crystal panels 441R, 441G, and 441B, the adhesive is cured (adhesive curing step).

The position adjustment of each liquid crystal panel 441R, 441G, 441B to the cross dichroic prism 45 in the position adjustment step (f) is performed as follows.
First, with respect to the liquid crystal panel 441G facing the projection lens 46 (FIG. 7 and the like), alignment adjustment (X-axis direction, Y-axis direction, The focus adjustment (adjustment in the Z-axis direction, Xθ direction, and Yθ direction) is performed by sliding the joint between the holding frame 443 and the holding member 446. That is, the alignment adjustment can be performed by moving one of the cross dichroic prism 45 and the holding member 446 in the X-axis direction, the Y-axis direction, and the θ-direction while fixing one position. The focus adjustment can be performed by moving one of the holding frame 443 and the holding member 446 in the Z-axis direction, the Xθ direction, and the Yθ direction with one position fixed. At this time, the wedge-shaped spacer 448A slides in the direction of the arrow in FIG. 21 as the holding frame 443 or the holding member 446 moves. After adjusting the liquid crystal panel 441G to a predetermined position, the adhesive is cured by hot air, hot beam, ultraviolet light, or the like.
Next, the position adjustment and fixing of the liquid crystal panels 441R and 441B are performed in the same manner as described above with reference to the liquid crystal panel 441G whose position adjustment and fixing have been completed.

Further, the optical device according to the present embodiment can be manufactured by the following second method.
(A) First, the polarizing plate 442 is fixed to the cross dichroic prism 45 (polarizing plate fixing step).
(B) The cross dichroic prism 45 to which the polarizing plate 442 is fixed is fixed to the center of the pedestal 445 (pedestal fixing step).
(C) The liquid crystal panels 441R, 441G, and 441B are housed in the concave frame body 444A of the holding frame 443. Further, the support plate 444B is attached to the concave frame 444A from the light emission side of the liquid crystal panels 441R, 441G, 441B, and the liquid crystal panels 441R, 441G, 441B are pressed and held. The support plate 444B can be attached to the concave frame 444A by engaging the hook 444D of the support plate 444B with the hook engaging portion 444C of the concave frame 444A (light modulation device holding step). ).
(E-1 ′) The bonding surface 446G of the holding member 446 is fixed to the light flux incident end surface of the cross dichroic prism 45 using an adhesive or the like (holding member fixing step).

(D) The holding frame 443 that stores and holds the liquid crystal panels 441R, 441G, and 441B is stored between the left and right standing pieces 446D of the holding member 446 and is brought into contact with the support piece 446K (holding frame mounting step). .
(E-2) A wedge-shaped spacer 448A coated with an adhesive is inserted between the slope 446E formed on the inner surface of the upright piece 446D and the outer peripheral surface 443E of the holding frame 443 (spacer mounting step). At this time, the spacer 448A is in close contact with the inclined surface 446E and the outer peripheral surface 443E of the holding frame 443 due to the surface tension of the adhesive.
(F ′) Further, the positions of the liquid crystal panels 441R, 441G, and 441B are adjusted in a state where the adhesive applied to the wedge-shaped spacer is uncured (position adjusting step).
(G) After adjusting the position of the liquid crystal panels 441R, 441G, and 441B, the adhesive is cured (adhesive curing step).

The position adjustment of each of the liquid crystal panels 441R, 441G, 441B in the position adjustment step (f ′) is performed as follows.
First, with respect to the liquid crystal panel 441G facing the projection lens 46 (FIG. 7 and the like), the joint between the holding frame 443 and the holding member 446, that is, the wedge-shaped spacer 448A is slid in the arrow direction in FIG. X axis direction, Y axis direction, θ direction adjustment) and focus adjustment (Z axis direction, Xθ direction, Yθ direction adjustment) are performed. That is, the alignment adjustment and the focus adjustment can be performed by moving the holding frame 443 in the X axis direction, the Y axis direction, the θ direction, and the Z axis direction, the Xθ direction, and the Yθ direction. At this time, the wedge-shaped spacer 448 </ b> A slides in the direction of the arrow in FIG. 21 with the movement of the holding frame 443. After adjusting the liquid crystal panel 441G to a predetermined position, the adhesive is cured by hot air, hot beam, ultraviolet light, or the like.

Next, the position adjustment and fixing of the liquid crystal panels 441R and 441B are performed in the same manner as described above with reference to the liquid crystal panel 441G whose position adjustment and fixing have been completed.
Regarding the fixing between the holding frame 443 and the holding member 446 in the above two types of manufacturing methods, for example, spot temporary fixing is first performed on the adhesive around the spacer 448A, and then the inclined surface 446E and the outer peripheral surface of the holding frame 443 are used. The gap between the 443E and the 443E can be filled with an adhesive and finally fixed. If such a fixing method is employed, the holding frame 443 and the holding member 446 can be firmly fixed in a short time. In addition, since the adhesive is filled in the gap between the inclined surface 446E and the outer peripheral surface 443E of the holding frame 443, the position of the spacer 448A can be prevented from being shifted due to thermal stress or the like after the position adjustment. The positions of the liquid crystal panels 441R, 441G, 441B are maintained in an appropriate state.

The liquid crystal panels 441R, 441G, and 441B are not necessarily attached to the cross dichroic prism 45 in the above order. For example, when using solder as an adhesive, in the manufacturing steps (d), (e-1), (e-1 ′), and (e-2), each member is mounted without using an adhesive. After the position adjustment of f) is completed, the cross dichroic prism 45, the holding member 446, the spacer 448A, and the holding frame 443 may be fixed with solder. The same applies to optical devices of other embodiments manufactured by the same manufacturing method as in this embodiment.
The liquid crystal panels 441R, 441G, 441B and the cross dichroic prism 45 integrated as described above are fixed to the lower housing 471 (FIG. 6) with screws or the like using the base 445 at the bottom.

According to such 6th Embodiment, there exist the following effects.
(20) The light flux incident end surface of the cross dichroic prism 45 and the surface of the holding member 446 are fixed without interposing a position adjusting member such as a pin or a spacer. That is, the positions of the liquid crystal panels 441R, 441G, and 441B are relatively fixed to the light beam incident end surface of the cross dichroic prism 45 through the spacer 448A, but the holding member 446 and the light beam incident end surface of the cross dichroic prism 45 There are no spacers between them. In addition, the spacer is disposed between the standing piece 446D of the holding member 446 formed so as to cover the side edges of the liquid crystal panels 441R, 441G, and 441B and the holding frame 443 that holds the liquid crystal panels 441R, 441G, and 441B. ing. Therefore, the position adjustment of the liquid crystal panels 441R, 441G, and 441B is easy, and the influence of the position shift of the spacer 448A after the position adjustment on the position shift of the liquid crystal panels 441R, 441G, 441B is relatively small. Therefore, it is possible to contribute to the reduction of the manufacturing cost and the improvement of the image quality of the optical device, and thus the projector in which it is used.

(21) Also, according to the first method of manufacturing an optical device according to the sixth embodiment, alignment adjustment (adjustment in the X-axis direction, Y-axis direction, and θ-direction) The joint surface with the holding member 446 is used as a sliding surface, and focus adjustment (adjustment in the Z-axis direction, Xθ direction, and Yθ direction) is performed by sliding the joint portion between the holding frame 443 and the holding member 446. I have to. Therefore, the same effect as (19) described in the description of the first embodiment can be obtained.
(22) It is also possible to obtain the same effects as the above (11) to (14) described in the description of the first embodiment.

(23) Further, the holding member 446 includes a convex portion 446F on the joint surface with the cross dichroic prism 45, and a partial gap is formed between the convex portion and the cross dichroic prism 45. Therefore, when it is necessary to replace the liquid crystal panels 441R, 441G, and 441B at the time of manufacturing or after manufacturing, a tool such as a screwdriver is inserted into the gap to easily pull the holding member 446 and the cross dichroic prism 45. It can be peeled off. Therefore, it is possible to contribute to the reduction of the manufacturing cost of the optical device, and thus the projector, and the improvement of after-sales service. In addition, the gap forms an air path for cooling the liquid crystal panels 441R, 441G, 441B and an optical element such as a polarizing plate disposed in the periphery thereof, so the liquid crystal panels 441R, 441G, 441B and the periphery thereof. It is possible to prevent deterioration of the optical element arranged in the heat due to heat, which contributes to improvement in image quality.

(24) Further, the standing piece 446D of the holding member 446 is formed so as to cover the side edge of the holding frame. Therefore, light leaking from between the holding frame 443 and the liquid crystal panels 441R, 441G, 441B can be blocked. Therefore, light leaking from between the holding member 446 and the holding frame 443 can be blocked. That is, the standing piece 446D can prevent light leaked without an optical device from being squeezed into the projection lens 46 to reduce the contrast of the projected image or blur the image. An image can be obtained.

  In the present embodiment, a configuration in which the holding frame 443 and the holding member 446 are fixed without using the spacer 448A is also possible. In this case, the standing piece 446D of the holding member 446 and the outer peripheral surface of the holding frame 443 are opposed to each other by providing a gap capable of focus adjustment or a gap capable of both focus adjustment and alignment adjustment. After adjusting the positions of the panels 441R, 441G, and 441G, the holding member 446 and the holding frame 443 may be fixed with an adhesive or the like. Further, when the holding frame 443 and the holding member 446 are fixed without using the spacer 448A, the holding frame 443 and the holding member 446 are fixed with an adhesive or the like, and then faced to the light flux incident end face of the cross dichroic prism 45. The adhesive may be applied before adjusting the positions of the liquid crystal panels 441R, 441G, and 441G, and the position may be adjusted while the adhesive is uncured. Also, the adhesive may be applied and cured after adjustment. In this way, if the holding frame 443 and the holding member 446 are fixed without using the spacer 448A, in addition to the same effects as the above (20) to (24), the first embodiment described ( It is possible to obtain the same effects as 1) and (5).

[Seventh Embodiment]
Next, a seventh embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the sixth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the optical device according to the sixth embodiment, the holding frame 443 is attached to the holding member 446 by the two left and right wedge-shaped spacers 448A.
In contrast, in the optical device according to the seventh embodiment, as shown in FIG. 22 or FIG. 23, the holding frame 443 is attached to the holding member 446 by one wedge-shaped spacer 448B on each of the left and right sides. Specifically, the wedge-shaped spacer 448B is disposed over the entire length of the inclined surface 446E of the upright piece 446D, and the joint portion between the holding frame 443 and the holding member 446 is formed at the upper and lower ends. Other configurations and manufacturing methods are the same as those in the sixth embodiment.

According to such 7th Embodiment, it is possible to acquire the effect similar to 6th Embodiment.
In addition, since the holding frame 443 and the holding member 446 are fixed by the minimum necessary number of spacers 448B, the number of components is small, and it is possible to reduce the manufacturing cost of the optical device and thus the projector.

[Eighth Embodiment]
Next, an eighth embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the sixth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the sixth embodiment and the seventh embodiment, the holding frame 443 is fixed to the holding member 446 by the plurality of wedge-shaped spacers 448A and 448B.
On the other hand, in the eighth embodiment, as shown in FIG. 24 or FIG. 25, similar to the fourth and fifth embodiments, the holding members 446 are projected at the four corners of the surface on the holding frame 443 side. The difference is that the pin 447A and the holes 443D formed at the four corners of the holding frame 443 are used. The other configuration is the same as that of the sixth embodiment. Note that the position of the pin 447A is not necessarily the corner of the holding member 446. Further, the number of pins 447A is not limited to four, but may be two or more.
The manufacturing method of the optical device according to this embodiment is the same as that described in the fourth embodiment except that the step (b-2) does not exist.

According to the eighth embodiment, there are the following effects.
The holding member 446 is provided with a pin 447A for fixing the holding frame 443, and unlike the conventional POP structure, pins and spacers configured as independent parts are not used, so that it is described in the first embodiment. The same effect as (1) can be obtained.
The alignment adjustment (X-axis direction, Y-axis direction, Z-axis direction) is performed by using the joint surface between the light beam incident end surface of the cross dichroic prism 45 and the holding member 446 as a sliding surface, and focus adjustment (Z-axis direction, Xθ (Adjustment of the direction and Yθ direction) is performed by sliding the holding frame 443 through the joint portion of the holding frame 443 and the holding member 446, that is, the pin 447A. Therefore, it is possible to obtain the same effect as (19) described in the first embodiment.
In addition, it is possible to obtain the same effects as in (5) described in the first embodiment and the same effects as in (22) to (24) described in the sixth embodiment.

[Ninth Embodiment]
Next, a ninth embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the seventh embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the first to eighth embodiments, the holding frame 443 that holds the liquid crystal panels 441R, 441G, and 441B includes the concave frame 444A that stores the liquid crystal panels 441R, 441G, and 441B, and the liquid crystal that is stored. It was comprised by the support plate 444B which presses and fixes panel 441R, 441G, 441B.
In contrast, in the ninth embodiment, the holding frame 443F is configured by a concave frame that supports the light incident side of each of the liquid crystal panels 441R, 441G, and 441B. The light emission side is directly stored and held in the storage space 446H of the holding member 446 without being pressed and fixed by the support plate 444B. Other configurations are the same as those of the seventh embodiment.

  Further, in the method of manufacturing the optical device according to the present embodiment, the light modulation device holding step (c) only includes the liquid crystal panels 441R, 441G, and 441B in the holding frame 443F configured by the concave frame. Except for the end point, it is the same as the sixth embodiment described above.

According to such 9th Embodiment, there exist the following effects.
Since the holding frame 443F is configured without the support plate 444B, a hook engaging portion for fixing the support plate 444B is unnecessary, and a simple shape is formed using a plate material thinner than the concave frame 444A. be able to. Accordingly, it is possible to reduce the number of parts and the number of assembling steps, and it is possible to reduce the manufacturing cost of the optical device and consequently the projector.
In addition, the same effects as (20), (21), (23), and (24) described in the description of the sixth embodiment, the effects based on the number of spacers 448A described in the description of the seventh embodiment, and The same effects as the above (12) and (14) described in the description of the first embodiment can also be obtained.
In the present embodiment, a configuration in which the holding frame 443 and the holding member 446 are fixed without using the spacer 448A is also possible. In this case, the standing piece 446D of the holding member 446 and the outer peripheral surface of the holding frame 443F are opposed to each other by providing a gap capable of focus adjustment or a gap capable of both focus adjustment and alignment adjustment. After adjusting the positions of the panels 441R, 441G, and 441G, the holding member 446 and the holding frame 443 may be fixed with an adhesive or the like. The adhesive may be applied before adjusting the positions of the liquid crystal panels 441R, 441G, and 441G, and the position may be adjusted while the adhesive is uncured. Also, the adhesive may be applied and cured after adjustment. As described above, if the holding frame 443F and the holding member 446 are fixed without using the spacer 448A, in addition to the above effects, the same as (1) and (5) described in the first embodiment. An effect can also be obtained.

[Tenth embodiment]
Next, a tenth embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the sixth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the first to eighth embodiments, the holding frame 443 that holds the liquid crystal panels 441R, 441G, and 441B includes the concave frame 444A that stores the liquid crystal panels 441R, 441G, and 441B, and the liquid crystal that is stored. It was comprised by the support plate 444B which presses and fixes panel 441R, 441G, 441B.
On the other hand, in the tenth embodiment, as shown in FIG. 28 or FIG. 29, the holding frame 443G is configured by a support plate that supports the light incident side of each of the liquid crystal panels 441R, 441G, 441B.

The liquid crystal panels 441R, 441G, 441B are stored and held in the storage space 446H of the holding member 446, and the light incident side of the liquid crystal panels 441R, 441G, 441B is pressed and fixed by a holding frame 443G formed of a support plate. . The holding frame 443G and the holding member 446 configured by the support plate are fixed by engagement between a hook 444D provided on the holding frame 443G and a hook engaging portion 446I provided on the holding member 446.
Further, the holding member 446 in the sixth embodiment has an inclined surface 446E into which the spacer 448A is inserted inside the upright piece 446D (see FIG. 20). It does not have the slope 446E. Instead, the standing piece 446D of the holding member 446 is provided with through holes 446J exposed on the left and right side surfaces of the holding member 446. The spacer 448A is inserted between the light emission surface of the liquid crystal panels 441R, 441G, and 441B and the liquid crystal panel 441R, 441G, 441B side surface of the holding member 446 through the through hole 446J from the outside of the holding member 446. Is done. Three spacers 448A and three through holes 446J are provided, but two or four or more may be used.
Other configurations are the same as those of the sixth embodiment.

The optical device according to this embodiment is manufactured as follows.
(A) The polarizing plate 442 is fixed to the light beam incident end face of the cross dichroic prism 45 (polarizing plate fixing step).
(B) The cross dichroic prism 45 to which the polarizing plate 442 is fixed is fixed to the center of the pedestal 445 (pedestal fixing step).
(C) The joining surface 446G of the holding member 446 is fixed to the light beam incident end face of the cross dichroic prism 45 (holding member fixing step).
(D) The liquid crystal panels 441R, 441G, and 441B are accommodated in the accommodation space 446H of the holding member 446 (light modulation device holding step).
(E) A holding frame 443G constituted by a support plate is attached from the light incident side of the liquid crystal panels 441R, 441G, 441B, and the hooks 444D are engaged with the hook engaging portions 444C of the holding member 446, so that the liquid crystal panels 441R, 441G are engaged. , 441B are pressed and fixed (holding frame mounting step).
(F) A wedge-shaped spacer 448A coated with an adhesive is inserted into the through holes 446J provided on the left and right side surfaces of the holding member 446, and the liquid crystal panel 441R, 441G, 441B side surface of the holding member 446 and the liquid crystal panels 441R, 441G, The position of the liquid crystal panels 441R, 441G, and 441B is adjusted by moving while making contact with both of the light emission surfaces of 441B (position adjustment step).
(G) Thereafter, the adhesive is cured (adhesive curing step).

According to such 10th Embodiment, there exist the following effects.
The light incident end surface of the cross dichroic prism 45 and the surface of the holding member 446 are fixed without using a position adjusting member such as a pin or a spacer. That is, the positions of the liquid crystal panels 441R, 441G, and 441B are relatively fixed to the light beam incident end surface of the cross dichroic prism 45 through the spacer 448A, but the holding member 446 and the light beam incident end surface of the cross dichroic prism 45 There are no spacers between them. In addition, the spacer 448A has a light emission surface of the liquid crystal panels 441R, 441G, 441B and a liquid crystal panel 441R of the holding member 446 from the outside of the holding member 446 through a through hole 446J provided in the standing piece 446D of the holding member 446. , 441G, 441B side. Therefore, the same effect as the above (20) described in the sixth embodiment can be obtained.

Further, the holding frame 443G is configured only by the support plate, and the liquid crystal panels 441R, 441G, 441B are directly stored and held in the storage space 446H of the holding member 446, and the light incident side of the liquid crystal panels 441R, 441G, 441B is held by the holding frame 443G. Therefore, it is possible to reduce the number of parts and the number of assembly steps. Therefore, it is possible to reduce the manufacturing cost of the optical device, and hence the projector.
The effects (23) and (24) described in the sixth embodiment and the same effects as (12) and (14) described in the first embodiment can also be obtained.

[Eleventh embodiment]
Next, an eleventh embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the eighth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the eighth embodiment, the holding member 446 is directly fixed to the light beam incident end face of the cross dichroic prism 45. On the other hand, in the eleventh embodiment, a sapphire plate 451 having relatively high thermal conductivity is fixed to the light flux incident end surface of the cross dichroic prism 45, and the holding member 446 is attached to the cross dichroic prism 45 via the sapphire plate. It is fixed to the light incident end face.
Specifically, as shown in FIG. 30 or FIG. 31, a sapphire plate 451 is fixed to almost the entire surface of the light incident end face of the cross dichroic prism 45 using a double-sided tape or an adhesive, and the liquid crystal at the center of the sapphire plate 451 is fixed. A polarizing plate 442 is attached to the panel surface corresponding part using a double-sided tape or an adhesive. Further, the convex portion 446F of the holding member 446 is fixed to the sapphire plate 451 with an adhesive.

Furthermore, as shown in FIG. 32, the gap between the sapphire plate 451 and the base 445 is filled with an adhesive 449 having good thermal conductivity, and these are coupled so as to be thermally conductive.
Configurations other than those described above are the same as in the eighth embodiment.
In the method of manufacturing the optical device according to the present embodiment, the sapphire plate 451 is fixed to the light beam incident end surface of the cross dichroic prism 45 using a double-sided tape or an adhesive, and then the polarizing plate 442 is attached to the sapphire plate 451 on both sides. Except for fixing using a tape or an adhesive, and fixing the holding member 446 to the light flux incident end face of the cross dichroic prism 45 via the sapphire plate 451, the same as in the eighth embodiment.
As the adhesive for adhering the interfaces between the dichroic prism 45, the sapphire plate 451, the holding member 446, and the pedestal 445, the thermosetting adhesive having a good thermal conductivity as described above, or the photocurable adhesive is used. It is preferable to use it.
In addition, as a structure which couple | bonds the base 445 and the sapphire board 451 so that heat conduction is possible, instead of filling the adhesive which has heat conductivity between these, the heat conductive sheet with which carbon was mixed, and heat conductive material The sapphire plate 451 may be directly fixed to the lower housing 471 through a spacer member made of In this case, for the fixing of the heat conductive sheet and the spacer member, in addition to the heat conductive adhesive, mechanical fixing using a screw or the like can be used.

According to the eleventh embodiment, in addition to the same effects as in the eighth embodiment, the following effects can be obtained.
In addition to cooling using the air path between the cross dichroic prism 45 and the liquid crystal panels 441R, 441G, 441B, heat in the vicinity of the liquid crystal panels 441R, 441G, 441B and the polarizing plate is applied to the pins of the holding frame 443 to the holding member 446. 447A to holding member 446 to sapphire plate 451 to pedestal 445 to lower housing 471 can be conducted and dissipated in this order, so even if the prism 45 is made of glass with a relatively low thermal conductivity such as BK7, The cooling performance of the liquid crystal panels 441R, 441G, 441B and the polarizing plate 442 can be greatly improved. As a result, even when the brightness of the projector is increased, the deterioration of the liquid crystal panel can be suppressed, and stable image quality can be maintained.
In addition, the structure which adhere | attaches the holding member 446 with respect to the light-beam entrance end surface of the cross dichroic prism 45 via a sapphire plate like this embodiment, and couple | bonds a sapphire plate and a base so that heat conduction is possible. The present invention can also be applied to the tenth embodiment. In this way, also in the fourth to tenth embodiments, it is possible to obtain the effects of improving the cooling performance, suppressing the deterioration of the liquid crystal panel, and maintaining a stable image.

[Twelfth embodiment]
Next, a twelfth embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the sixth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the sixth embodiment, the holding member 446 is fixed to the light beam incident end face of the cross dichroic prism 45.
On the other hand, in the twelfth embodiment, the holding member 446 is fixed to the base 445 as shown in FIG. 33 or FIG. Furthermore, the upper ends of the opposing holding members 446 are connected by a frame connecting member 452.
The other configuration is the same as that of the sixth embodiment.

The manufacturing method of the optical device according to this embodiment is as follows.
(A) The polarizing plate 442 is fixed to the light beam incident end face of the cross dichroic prism 45 (polarizing plate fixing step).
(B) The cross dichroic prism 45 to which the polarizing plate 442 is fixed is fixed to the center of the upper surface of the pedestal 445 (pedestal fixing step).
(C) The liquid crystal panels 441R, 441G, and 441B are housed in the concave frame body 444A of the holding frame 443. Further, the support plate 444B is attached to the concave frame 444A from the light emission side of the liquid crystal panels 441R, 441G, 441B, and the liquid crystal panels 441R, 441G, 441B are pressed and held. The support plate 444B can be attached to the concave frame 444A by engaging the hook 444D of the support plate 444B with the hook engaging portion 444C of the concave frame 444A (light modulation device holding step). ).

(E-1 ″) Further, the bonding surface 446G of the holding member 446 is fixed to the three end surfaces of the base 445 using an adhesive or the like (holding member fixing step).
(D-1) Further, the frame connecting member 452 is fixed between the holding members 446 on the synthetic light emission side (connecting member fixing step). This frame connecting member 452 can be used as an auxiliary mounting plate for the projection lens 46.

(D-2) Subsequently, the holding frame 443 storing and holding the liquid crystal panels 441R, 441G, and 441B is stored between the left and right standing pieces 446D of the holding member 446 and brought into contact with the support piece 446K (holding frame mounting step). ).
(E-2) A wedge-shaped spacer 448A coated with an adhesive is inserted between the slope 446E formed on the inner surface of the upright piece 446D and the outer peripheral surface 443E of the holding frame 443 (spacer mounting step). At this time, the spacer 448A is in close contact with the inclined surface 446E and the outer peripheral surface 443E of the holding frame 443 due to the surface tension of the adhesive.
(F ′) Further, the positions of the liquid crystal panels 441R, 441G, and 441B are adjusted in a state where the adhesive applied to the wedge-shaped spacer is uncured (position adjusting step).
(G) After adjusting the position of the liquid crystal panels 441R, 441G, and 441B, the adhesive is cured (adhesive curing step).

Although the pedestal 445, the holding member 446, and the connecting member 452 are configured as separate parts and the optical device is assembled and integrated as described above, the configuration and the manufacturing method are described above. As shown in 35, a molding unit 460 in which these are integrally molded may be used.
The manufacturing method of the optical device in this case is as follows.
(A) The polarizing plate 442 is fixed to the light beam incident end face of the cross dichroic prism 45 (polarizing plate fixing step).
(B ′) Thereafter, the cross dichroic prism 45 to which the polarizing plate 442 is fixed is inserted from above the molding unit 460 and fixed to the center of the upper surface of the base 445 (molding unit fixing step).

(C) The liquid crystal panels 441R, 441G, and 441B are housed in the concave frame body 444A of the holding frame 443. Further, the support plate 444B is attached to the concave frame 444A from the light emission side of the liquid crystal panels 441R, 441G, 441B, and the liquid crystal panels 441R, 441G, 441B are pressed and held. The support plate 444B can be attached to the concave frame 444A by engaging the hook 444D of the support plate 444B with the hook engaging portion 444C of the concave frame 444A (light modulation device holding step). ).
(D-2) Subsequently, the holding frame 443 storing and holding the liquid crystal panels 441R, 441G, and 441B is stored between the left and right standing pieces 446D of the holding member 446 and brought into contact with the support piece 446K (holding frame mounting step). ).
(E-2) A wedge-shaped spacer 448A coated with an adhesive is inserted between the slope 446E formed on the inner surface of the upright piece 446D and the outer peripheral surface 443E of the holding frame 443 (spacer mounting step). At this time, the spacer 448A is in close contact with the inclined surface 446E and the outer peripheral surface 443E of the holding frame 443 due to the surface tension of the adhesive.
(F ′) Further, the positions of the liquid crystal panels 441R, 441G, and 441B are adjusted in a state where the adhesive applied to the wedge-shaped spacer is uncured (position adjusting step).
(G) After adjusting the position of the liquid crystal panels 441R, 441G, and 441B, the adhesive is cured (adhesive curing step).

As described above, by employing the molding unit 460 in which the base 445, the holding member 446, and the connecting member 452 are integrally molded, the number of parts is reduced, and the structure can be simplified. Further, since the holding member fixing step and the connecting member fixing step can be omitted, the optical device can be easily assembled. Therefore, it is possible to contribute to the reduction of the manufacturing cost of the optical device, and thus the projector. Note that it is not necessary to integrally mold all of the base 445, the holding member 446, and the connecting member 452, and the same effect can be obtained even when only two of these are integrally molded. .
Regarding the above two manufacturing methods, the position adjusting method of each of the liquid crystal panels 441R, 441G, 441B in the position adjusting step (f ′) is the step described in the second manufacturing method of the optical device according to the sixth embodiment ( It is the same as f ′).

  In addition, with respect to the fixing between the holding frame 443 and the holding member 446, for example, spot temporary fixing is first performed on the adhesive around the spacer 448A, and then, between the inclined surface 446E and the outer peripheral surface 443E of the holding frame 443. The gap can be filled with an adhesive so as to be fixed. If such a fixing method is employed, the holding frame 443 and the holding member 446 can be firmly fixed in a short time. Further, since the adhesive is filled in the gap between the inclined surface 446E and the outer peripheral surface 443E of the holding frame 443, it is possible to prevent the position of the spacer 448A from being displaced due to thermal stress or the like after the position adjustment. The positions of the liquid crystal panels 441R, 441G, and 441B are maintained in an appropriate state.

The liquid crystal panels 441R, 441G, and 441B are not necessarily attached to the cross dichroic prism 45 in the above order. For example, when using solder as an adhesive, each member is mounted without using an adhesive in the manufacturing steps (d-1), (d-2), (e-1 ″), and (e-2). After the position adjustment of (f ′) is completed, the holding member 446, the spacer 448A, the holding frame 443, and the connecting member 452 may be fixed by soldering. The member 452 may be mechanically fixed by screws, etc. The same applies to the optical devices of other embodiments manufactured by the same manufacturing method as in this embodiment.
The liquid crystal panels 441R, 441G, 441B and the cross dichroic prism 45 integrated as described above are fixed to the lower housing 471 (FIG. 6) with screws or the like using the base 445 at the bottom.

According to the twelfth embodiment, there are the following effects.
(25) Instead of fixing the liquid crystal panels 441R, 441G, and 441B to the light beam incident end face of the cross dichroic prism 45 as in the conventional POP structure, the side surface of the base 445 fixed to the upper and lower surfaces of the cross dichroic prism 45 To be fixed to. Therefore, it is possible to obtain the same effects as the above (2) to (4) described in the explanation part of the first embodiment.
(26) The light incident end face of the cross dichroic prism 45 and the face of the holding member 446 are fixed without interposing a position adjusting member such as a pin or a spacer. That is, the positions of the liquid crystal panels 441R, 441G, and 441B are relatively fixed to the side surface of the pedestal 445 via the spacer 448A, but there is no spacer between the holding member 446 and the pedestal 445. In addition, the spacer is disposed between the standing piece 446D of the holding member 446 formed so as to cover the side edges of the liquid crystal panels 441R, 441G, and 441B and the holding frame 443 that holds the liquid crystal panels 441R, 441G, and 441B. ing. Therefore, the same effect as the above (20) described in the explanation part of the sixth embodiment can be obtained.

(27) The holding member 446 includes a convex portion 446F on the joint surface with the pedestal 445, and a partial gap is formed between the convex portion and the pedestal 445. When the liquid crystal panels 441R, 441G, and 441B need to be replaced, the holding member 446 and the cross dichroic prism 45 can be easily peeled off by inserting a tool such as a screwdriver into the gap. Therefore, it is possible to obtain the same effect as (23) described in the description of the sixth embodiment.
(28) In addition, the same effects as (22) and (24) described in the description of the sixth embodiment can be obtained.
(29) Further, by connecting the upper end portion of the holding member 446 with the frame connecting member 452, the holding member 446 can be stably held and fixed, and the temperature distribution of the holding member 446 is made uniform and the heat transfer property is improved. Can be improved.

[Thirteenth embodiment]
Next, a thirteenth embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the twelfth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the optical device according to the twelfth embodiment, the holding frame 443 is attached to the holding member 446 with two wedge-shaped spacers 448A on the left and right sides.
In contrast, in the optical device according to the thirteenth embodiment, as shown in FIG. 36 or FIG. 37, the holding frame 443 is attached to the holding member 446 by one wedge-shaped spacer 448B on each of the left and right sides. Specifically, the wedge-shaped spacer 448B is disposed over the entire length of the inclined surface 446E of the upright piece 446D, and the joint portion between the holding frame 443 and the holding member 446 is formed at the upper and lower ends. Also in this embodiment, as shown in FIG. 38, it is possible to use a pedestal 445, a holding member 446, a connecting member 452, or a molding unit 470 in which any two of these are integrally molded.
Configurations and manufacturing methods other than those described above are the same as in the twelfth embodiment.

According to such a thirteenth embodiment, it is possible to obtain the same effect as that of the twelfth embodiment.
In addition, since the holding frame 443 and the holding member 446 are fixed by the minimum necessary number of spacers 448B, the number of components is small, and it is possible to reduce the manufacturing cost of the optical device and thus the projector.

[Fourteenth embodiment]
Next, a fourteenth embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the twelfth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the twelfth embodiment and the thirteenth embodiment, the holding frame 443 is fixed to the holding member 446 by the plurality of wedge-shaped spacers 448A and 448B.
On the other hand, in the fourteenth embodiment, as shown in FIG. 39 or FIG. 40, pins 447A that protrude from the four corners of the surface of the holding member 446 on the holding frame 443 side and holes formed at the four corners of the holding frame 443 are provided. The difference is that it is performed using 443D. Other configurations are the same as those in the twelfth embodiment. Here, the position of the pin 447A does not have to be the corner of the holding member 446. Further, the number of pins 447A is not limited to four, but may be two or more.
Also in this embodiment, as shown in FIG. 41, it is possible to use a pedestal 445, a holding member 446, a connecting member 452, or a molding unit 470 in which any two of these are integrally molded.
The optical device according to the present embodiment is substantially the same as the optical device manufacturing method according to the twelfth embodiment, but in the holding frame mounting step (d-2), the holding member 446 is inserted into the hole 443D of the holding frame 443. The position adjustment of the liquid crystal panels 441R, 441G, and 441B is maintained in the point where the pin 447A is inserted together with the adhesive, the point (e-2) where there is no spacer mounting step, and the position adjustment step (f ′). The difference is that the frame 443 is slid by the joint portion with the holding member 446, that is, by sliding the pin 447A.

According to the fourteenth embodiment, the pin 447A for fixing the holding frame 443 to the holding member 446 is provided, and a pin or spacer configured as an independent part is provided as in the conventional POP structure. Since this is not done, the same effect as the above (1) described in the description of the first embodiment can be obtained.
In addition, the same effects as the above (2) to (5) and (11) to (14) described in the description of the first embodiment, and the above (27) and (29) described in the description of the twelfth embodiment. It is also possible to obtain the same effect as in (1).

[Fifteenth embodiment]
Next, a fifteenth embodiment of the present invention is described.
In the following description, the same structure and the same members as those in the thirteenth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the twelfth embodiment to the fourteenth embodiment, the holding frame 443 that holds the liquid crystal panels 441R, 441G, and 441B is housed in the concave frame body 444A that houses the liquid crystal panels 441R, 441G, and 441B. The liquid crystal panels 441R, 441G, and 441B are configured by a support plate 444B that presses and fixes the liquid crystal panels 441R, 441G, and 441B.
On the other hand, in the fifteenth embodiment, as shown in FIGS. 42 and 43, the holding frame 443F is configured by a concave frame that supports the light incident side of each of the liquid crystal panels 441R, 441G, and 441B. The light emission side is directly stored and held in the storage space 446H of the holding member 446 without being pressed and fixed by the support plate 444B. Also in this embodiment, as shown in FIG. 38, it is possible to use a pedestal 445, a holding member 446, a connecting member 452, or a molding unit 470 in which any two of these are integrally molded. Other configurations are the same as those in the thirteenth embodiment.
Further, the optical device manufacturing method according to the present embodiment is completed only by storing the liquid crystal panels 441R, 441G, and 441B in the holding frame 443F configured by the concave frame body in the optical modulation device holding step (c). Except for this point, it is the same as the thirteenth embodiment described above.

The fifteenth embodiment has the following effects.
Since the holding frame 443F is configured without the support plate 444B, a hook engaging portion for fixing the support plate 444B is not necessary, and a simple shape is formed using a plate material thinner than the concave frame 444A. Can do. Therefore, it is possible to reduce the number of parts and the number of assembling steps, and it is possible to reduce the manufacturing cost of the optical device and consequently the projector.
In addition, the same effects as the above (25) to (27) and (29) described in the description of the twelfth embodiment, the effect based on the number of spacers 448B described in the description of the thirteenth embodiment, and the The same effects as the above (12) and (14) described in the first embodiment can also be obtained.

  In the present embodiment, a configuration in which the holding frame 443 and the holding member 446 are fixed without using the spacer 448B is also possible. In this case, the standing piece 446D of the holding member 446 and the outer peripheral surface of the holding frame 443F are opposed to each other by providing a focus adjustable gap or a gap capable of both focus adjustment and alignment adjustment, and the liquid crystal panels 441R and 441G. , 441B, the holding member 446 and the holding frame 443 may be fixed with an adhesive or the like. The adhesive may be applied before adjusting the positions of the liquid crystal panels 441R, 441G, and 441B, and the position may be adjusted with an uncured adhesive. Alternatively, the adhesive may be applied and cured after adjustment. In this way, if the holding frame 443F and the holding member 446 are fixed without using the spacer 448B, in addition to the above effects, the same as (1) and (5) described in the first embodiment. It is possible to obtain the effect of.

[Sixteenth Embodiment]
Next, a sixteenth embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the twelfth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the twelfth embodiment to the fourteenth embodiment, the holding frame 443 that holds the liquid crystal panels 441R, 441G, and 441B includes the concave frame body 444A that stores the liquid crystal panels 441R, 441G, and 441B, and the liquid crystal that is stored. It was comprised by the support plate 444B which presses and fixes panel 441R, 441G, 441B.

On the other hand, in the sixteenth embodiment, as shown in FIG. 44 or FIG. 45, the holding frame 443G is configured by a support plate that supports the light incident side of each liquid crystal panel 441R, 441G, 441B.
The liquid crystal panels 441R, 441G, and 441B are stored and held in the storage space 446H of the holding member 446, and the incident side of the liquid crystal panels 441R, 441G, and 441B is pressed and fixed by a holding frame 443G formed of a support plate. The holding frame 443G and the holding member 446 configured by the support plate are fixed by engagement between a hook 444D provided on the holding frame 443G and a hook engaging portion 446I provided on the holding member 446.
Further, the holding member 446 in the twelfth embodiment has an inclined surface 446E into which the spacer 448A is inserted inside the upright piece 446D (see FIG. 34). It does not have the slope 446E. Instead, the standing piece 446D of the holding member 446 of the present embodiment is provided with through holes 446J exposed on the left and right side surfaces of the holding member 446. The spacer 448A is located between the light emission surface of the liquid crystal panels 441R, 441G, 441B and the surface of the holding member 446 on the 441R, 441G, 441B side through the through hole 446J from the outside of the holding member 446. Inserted. Three spacers 448A and three through holes 446J are provided, but two or four or more may be used. Other configurations are the same as those in the twelfth embodiment.

The optical device according to the present embodiment is manufactured as follows.
(A) First, the polarizing plate 442 is fixed to the light beam incident end face of the cross dichroic prism 45 (polarizing plate fixing step).
(B) The cross dichroic prism 45 to which the polarizing plate 442 is fixed is fixed to the center of the upper surface of the pedestal 445 (pedestal fixing step).
(C) Further, the joining surface 446G of the holding member 446 is fixed to the three end surfaces of the base 445 (holding member fixing step).
(D-1) Further, the frame connecting member 452 is fixed between the holding members 446 on the synthetic light emission side (connecting member fixing step).

(D-2) The liquid crystal panels 441R, 441G, and 441B are accommodated in the accommodation space 446H of the holding member 446 (light modulation device holding step).
(E) A holding frame 443G constituted by a support plate is attached from the light incident side of the liquid crystal panels 441R, 441G, 441B, and the hooks 444D are engaged with the hook engaging portions 444C of the holding member 446, so that the liquid crystal panels 441R, 441G are engaged. , 441B are pressed and fixed (holding frame mounting step).
(F) A wedge-shaped spacer 448A is inserted into the through holes 446J provided on both the left and right sides of the holding member 446, and the surfaces of the holding member 446 on the liquid crystal panels 441R, 441G, 441B side and the light emission surfaces of the liquid crystal panels 441R, 441G, 441B. The positions of the liquid crystal panels 441R, 441G, and 441B are adjusted by bringing them into contact with each other (position adjustment step).
(G) Thereafter, the adhesive is cured (adhesive curing step).
In place of the adhesive, the holding member 446 and the frame connecting member 452 may be mechanically fixed by screws or the like.

According to the sixteenth embodiment, there are the following effects.
The pedestal 445 and the surface of the holding member 446 are fixed without using a position adjusting member such as a pin or a spacer. That is, the positions of the liquid crystal panels 441R, 441G, and 441B are relatively fixed to the pedestal 445 via the spacer 448A, but there is no spacer between the holding member 446 and the pedestal 445. In addition, the spacer 448A has a light emission surface of the liquid crystal panels 441R, 441G, 441B and a liquid crystal panel 441R of the holding member 446 from the outside of the holding member 446 through a through hole 446J provided in the standing piece 446D of the holding member 446. , 441G, 441B side. Therefore, the same effect as (34) described in the twelfth embodiment can be obtained.
Further, the holding frame 443G is configured only by the support plate, and the liquid crystal panels 441R, 441G, 441B are directly stored and held in the storage space of the holding member 446, and the light incident side of the liquid crystal panels 441R, 441G, 441B is held by the holding frame 443G. Since it is pressed and fixed, it is possible to reduce the number of parts and the number of assembly steps. Therefore, it is possible to reduce the manufacturing cost of the optical device, and hence the projector.
In addition, the same effects as (25), (27), and (29) described in the twelfth embodiment and the same effects as (12) and (14) described in the first embodiment are also obtained. It is possible.

[Seventeenth embodiment]
Next, a seventeenth embodiment of the present invention will be described.
In the following description, the same structure and the same members as those in the twelfth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the twelfth embodiment, the holding member 446 is directly fixed to the light beam incident end face of the cross dichroic prism 45. On the other hand, in the seventeenth embodiment, a sapphire plate 451 having a relatively high thermal conductivity is fixed to the light incident end surface of the cross dichroic prism 45, and the holding member 446 is attached to the side surface of the base 445 via the sapphire plate 451. It is fixed against.
Specifically, as shown in FIGS. 46 and 47, a sapphire plate 451 is fixed to the front surface of the light incident end surface of the cross dichroic prism 45 by using a double-sided tape or an adhesive, and the central portion of the sapphire plate 451 is fixed. A polarizing plate 442 is attached to the liquid crystal panel surface corresponding part using a double-sided tape or an adhesive. Further, the convex portion 446F of the holding member 446 is fixed to the sapphire plate 451 with an adhesive.
Further, as shown in FIG. 47, the gap between the sapphire plate 451 and the base 445 is filled with an adhesive 449 having good thermal conductivity, and these are coupled so as to be thermally conductive.
Configurations other than those described above are the same as in the twelfth embodiment.
In the method of manufacturing the optical device according to the present embodiment, the sapphire plate 451 is fixed to the light beam incident end surface of the cross dichroic prism 45 using a double-sided tape or an adhesive, and then the polarizing plate 442 is attached to the sapphire plate 451 on both sides. Except for the point of fixing using a tape or an adhesive and the point of fixing the holding member 446 to the side surface of the pedestal 445 via the sapphire plate 451, it is the same as the twelfth embodiment.
As the adhesive for adhering the interfaces between the pedestal 445, the sapphire plate 451, and the holding member 446, it is preferable to use a thermosetting adhesive or a photocurable adhesive having good thermal conductivity as described above. .

In addition, as a structure which couple | bonds the base 445 and the sapphire board 451 so that heat conduction is possible, instead of filling the adhesive which has heat conductivity between these, the heat conductive sheet with which carbon was mixed, and heat conductive material Alternatively, the sapphire plate 451 may be directly fixed to the lower housing 471 through a spacer member made of. In this case, for the fixing of the heat conductive sheet and the spacer member, in addition to the heat conductive adhesive, mechanical fixing using a screw or the like can be used.
Although not shown, when the sapphire plate 451 is formed smaller than the dimension between the convex portions 446F provided at the left and right edges of the holding member 446, the sapphire is fixed when the holding member 446 is fixed to the side surface of the base 445. The plate 451 may be positioned between the convex portions of the holding member 446.

According to the seventeenth embodiment, in addition to the same effects as in the twelfth embodiment, the following effects can be obtained.
In addition to cooling using the air path between the cross dichroic prism 45 and the liquid crystal panels 441R, 441G, 441B, the heat of the liquid crystal panels 441R, 441G, 441B and the polarizing plate 442 Since heat can be dissipated by conducting in the order of the body 471, the cooling performance of the liquid crystal panels 441R, 441G, 441B and the polarizing plate 442 is improved even if the prism 45 is made of glass having a relatively low thermal conductivity such as BK7. It is possible to greatly improve. As a result, even when the brightness of the projector is increased, the deterioration of the liquid crystal panel can be suppressed, and stable image quality can be maintained.
Note that the configuration using the sapphire plate 451 as in this embodiment can also be applied to the first to third embodiments and the twelfth to sixteenth embodiments. In this way, in the first to third embodiments and the twelfth to sixteenth embodiments, it is possible to obtain the effects of improving the cooling performance, suppressing the deterioration of the liquid crystal panel, and maintaining a stable image. Become.

[Other Embodiments]
As mentioned above, although various embodiment of this invention has been described, this invention is not limited to the said embodiment, The other structure etc. which can achieve the objective of this invention are included. For example, the following modifications are also included in the present invention.
For example, in the first, fourth, fifth, eighth, eleventh, and fourteenth embodiments, the holding member 446 includes a pin 447A that protrudes from the rectangular plate-like body 446A, and the pin 447A has a substantially columnar structure. However, the tip side may be narrower than the base end. For example, as shown in FIG. 48, a substantially conical structure that tapers from the proximal end to the distal end may be used. Thus, if the tip side of the pin 447A is narrower than the base end, the holding member 446 and the holding frame 443 can be efficiently and reliably secured in a short time with a photo-curing adhesive such as an ultraviolet effect adhesive. It can be fixed. This is because when light is applied from the tip of the pin 447A and cured, light reflection and absorption at the tip of the pin 447A is reduced, and light is applied to the adhesive existing at the joint between the pin 447A and the holding frame 443. It is because it is irradiated enough. Such a structure is particularly preferable when the holding member 446 is made of metal.

  Moreover, you may make the corner | angular shape of the base 445 in 1st-3rd embodiment into a taper shape as shown in FIG. 49A shows a plan view of a pedestal 445 whose corners are tapered, and FIG. 49B shows a cross-sectional view taken along line BB of FIG. 49A. With the base 445 having such a shape, the holding member 446 and the holding frame 443 can be fixed efficiently and reliably in a short time with a photo-curing adhesive such as an ultraviolet effect adhesive. . This is because when light is applied to the gap between the pedestal 445 and the holding member 446 from above the pedestal 445 in order to join the pedestal 445 and the holding member 446, reflection and absorption of light at the corners of the pedestal 445 are performed. This is because the adhesive present in the gap between the base 445 and the holding member 446 is sufficiently irradiated with light. Here, the case where light is irradiated from above the pedestal 445 has been described, but when light is irradiated from below the pedestal 445 fixed below the cross dichroic prism 45, the light is fixed below the pedestal. The end of the pedestal 445 may be tapered. Moreover, the structure which makes the angle | corner of the base 445 into a taper shape in this way is applicable also to 12th-17th Embodiment.

In the first to fifth, eighth, eleventh, and fourteenth embodiments, the holding member 446 and the holding frame 443 are fixed via the pin 447A and the upright piece 447B having a substantially L-shape on the front side. Further, the shape of the upright piece 447B is not limited to the shape shown in FIGS. That is, the shape of the pins 447A and the upright pieces 447B may be any shape as long as the holding member 446 and the holding frame 443 can be fixed.
Further, the shape of the engaging groove 446C provided in the holding member 446 of the first to third embodiments is not limited to the shape shown in FIGS. That is, any shape that can support the polarizing plate 442 may be used.

Furthermore, the position of the pedestal 445 and how to attach the pedestal 445 and the lower housing 471 are not limited to the configuration shown in the above embodiment.
For example, in the first to third embodiments, the pedestals 445 are provided on the upper and lower surfaces (both the pair of end surfaces intersecting with the light beam incident end surfaces) of the cross dichroic prism 45, but as in the twelfth to seventeenth embodiments. You may change into the structure used with the base 445 and the connection member 452. FIG. Conversely, the configuration using the pedestal 445 and the connecting member 452 in the twelfth to seventeenth embodiments may be changed to a configuration in which the pedestal 445 is provided on both the upper and lower surfaces of the prism 45 as in the first to third embodiments.

  In the first to fourth embodiments, the optical device is fixed to the lower housing 471 by the pedestal 445 fixed to the upper surface of the prism 45. However, as in other embodiments, the optical device is fixed to the lower surface of the prism 45. The pedestal may be fixed to the lower housing 471. In the first to fourth embodiments, the attachment portion 445B to the lower housing 471 of the optical device is provided on the base 445 fixed to the upper surface of the cross dichroic prism 45. You may make it form in the base 445 fixed to the lower surface. However, if the mounting portion 445B is formed on the pedestal 445 fixed to the upper surface of the cross dichroic prism 45 as in the embodiment, there is an advantage that the optical device can be easily attached to and detached from the lower housing 471. Further, the optical device of the fifth to seventeenth embodiments may be fixed to the lower housing 471 by a pedestal 445 fixed to the upper surface of the prism 45 like the optical devices of the first to fourth embodiments.

  Furthermore, in the first to fourth embodiments, the optical device is fixed to the attachment portion 473 provided on the boss portion 476 of the lower housing 471, but the structure for attaching the optical device is not limited thereto. That is, the position, shape, and the like at which the optical device mounting portion is provided are arbitrary. Further, the shape of the mounting portion 445B provided on the base 445 is also arbitrary, and is not limited to the shape of each embodiment described above. In addition, although the head part 49 and the holding piece 477 were integrally provided in the boss | hub part 476 of the lower housing | casing 471, you may provide each separately.

  In the fourth embodiment, no partial gap is formed between the cross dichroic prism 45 and the holding member 446. However, as in the sixth to seventeenth embodiments, the cross dichroic prism 45 and the holding member 446 are not formed. A partial gap may be formed between them. With such a configuration, it is possible to obtain the effect (23) described in the sixth embodiment.

  Further, in the twelfth to sixteenth embodiments, the gap formed between the cross dichroic prism 45 and the holding member 446 may be filled with a heat conductive adhesive. In that case, since the heat conduction path from the holding member 446 to the cross dichroic prism 45 to the base 445 is also formed, cooling of the liquid crystal panels 441R, 441G, and 441B is further promoted.

In the above embodiment, the cross dichroic prism 45 is configured by a prism made of a material such as optical glass, crystal, or sapphire, and a dielectric multilayer film. However, the configuration of the prism 45 is not limited thereto. For example, a cross mirror may be disposed in a substantially rectangular or cubic container formed of glass or the like, and the container may be filled with a liquid. That is, the prism 45 may have any configuration as long as it has a function of combining color lights and a light beam incident end face for attaching the light modulation device.
Furthermore, in each of the above embodiments, only an example of a projector using three light modulation devices has been described. However, the present invention is a projector using only one light modulation device, a projector using two light modulation devices, Alternatively, it can be applied to a projector using four or more light modulation devices.

In each of the above embodiments, a liquid crystal panel is used as the light modulation device. However, a light modulation device other than liquid crystal, such as a device using a micromirror, may be used.
Furthermore, in the above-described embodiment, the transmission type light modulation device having a different light incident surface and light emission surface is used. Also good.

  Furthermore, in each of the above-described embodiments, only an example of a front type projector that performs projection from the direction of observing the screen has been described. However, the present invention is a rear type that performs projection from the opposite side to the direction of observing the screen. It can also be applied to other projectors.

  The present invention relates to an optical device in which a light modulation device that modulates color light according to image information and a color combining optical element that combines color light modulated by the light modulation device, a method for manufacturing the optical device, and It can be used for a projector employing the optical device.

1 is an overall perspective view of a projector according to an embodiment of the present invention as viewed from above. 1 is an overall perspective view of a projector according to an embodiment of the present invention as viewed from below. FIG. 2 is a perspective view showing the inside of the projector according to the embodiment of the present invention, specifically, a view in which an upper case of the projector is removed from the state of FIG. FIG. 4 is a perspective view showing the inside of the projector according to the embodiment of the present invention, specifically, a view seen from the rear side with the shield plate, driver board, and upper housing removed from the state of FIG. 3. It is a perspective view which shows the inside of the projector which concerns on embodiment of this invention, and the figure which specifically removed the optical unit from the state of FIG. The perspective view which looked at the optical unit which concerns on embodiment of this invention from the downward side. FIG. 2 is a plan view schematically showing an optical system of the projector according to the embodiment of the invention. The perspective view which looked at the optical apparatus which concerns on 1st Embodiment from the upper side. FIG. 3 is an exploded perspective view illustrating the structure of the optical device according to the first embodiment. The perspective view which shows the attachment position of the optical apparatus which concerns on embodiment of this invention. The top view which shows the optical unit which concerns on embodiment of this invention. XII-XII sectional view taken on the line of FIG. The enlarged view of the XIII part shown in FIG. The top view which expands and shows the principal part of the optical unit which concerns on embodiment of this invention. The disassembled perspective view showing the structure of the optical device according to the second embodiment. The disassembled perspective view showing the structure of the optical device according to the third embodiment. The disassembled perspective view showing the structure of the optical apparatus which concerns on 4th Embodiment. The disassembled perspective view which shows the principal part of 5th Embodiment. The perspective view showing the structure of the optical apparatus which concerns on 6th Embodiment. FIG. 20 is an exploded view of FIG. Explanatory drawing which shows arrangement | positioning and an effect | action of a wedge-shaped spacer in 6th Embodiment. The perspective view showing the structure of the optical apparatus which concerns on 7th Embodiment. FIG. 23 is an exploded view of FIG. 22. The perspective view showing the structure of the optical apparatus which concerns on 8th Embodiment. The assembly exploded view of FIG. The perspective view showing the structure of the optical apparatus which concerns on 9th Embodiment. FIG. 27 is an exploded view of FIG. 26. The perspective view showing the structure of the optical apparatus which concerns on 10th Embodiment. FIG. 29 is an exploded view of FIG. 28. The perspective view showing the structure of the optical apparatus which concerns on 11th Embodiment. FIG. 31 is an exploded view of FIG. 30. Explanatory drawing which shows the sapphire board and pedestal affixed on the prism. The perspective view showing the structure of the optical apparatus which concerns on 12th Embodiment. FIG. 34 is an exploded view of FIG. The perspective view which integrated the base and holding member of 12th Embodiment. The perspective view showing the structure of the optical apparatus which concerns on 13th Embodiment. FIG. 37 is an exploded view of FIG. 36. The perspective view which integrated the base and holding member of 13th Embodiment. The perspective view showing the structure of the optical apparatus which concerns on 14th Embodiment. FIG. 40 is an exploded view of FIG. 39. The perspective view which integrated the base and holding member of 14th Embodiment. The perspective view showing the structure of the optical apparatus which concerns on 15th Embodiment. FIG. 43 is an exploded view of FIG. 42. The perspective view showing the structure of the optical apparatus which concerns on 16th Embodiment. FIG. 45 is an exploded view of FIG. 44. The perspective view showing the structure of the optical apparatus which concerns on 17th Embodiment. Explanatory drawing which shows the sapphire board and pedestal affixed on the glass prism. The enlarged view showing the modification of the pin shape of a holding member. The top view and sectional drawing showing the modification of a base shape.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 441, 441R, 441G, 441B ... Liquid crystal panel, 442 ... Polarizing plate on light incident side and exit side, 443 ... Holding frame, 443D ... Hole, 443C ... Opening, 444A ... concave frame, 444B ... support plate, 445 ... pedestal, 445A ... recess, 445B ... mounting part, 446 ... holding member, 446A ... rectangular Plate-like body, 446B ... opening, 446C ... engagement groove, 446D ... upright piece, 446F ... convex part, 446K ... support piece, 446L ... notch, 446M ..Support surface, 446M1 ... support surface, 447A ... pin, 447B, 447C ... rise piece, 448A, 448B ... wedge spacer, 45 ... cross dichroic prism, 47 ... optical components Enclosure Mounting portion 473 ... housing.

Claims (17)

An optical device in which a plurality of light modulation devices that modulate a plurality of color lights according to image information for each color light and a color combining optical element that combines each color light modulated by the light modulation device are integrally provided. ,
A holding frame that holds the light modulation device and has an opening in a portion corresponding to an image forming region of the light modulation device;
A pedestal fixed to at least one of a pair of end surfaces intersecting with a light beam incident end surface of the color combining optical element;
A holding member that has an upright piece formed so as to cover a side edge of the holding frame and a support piece that supports a surface of the holding frame on the color combining optical element side, and is directly fixed to the pedestal. When,
A spacer disposed between the holding frame and the upright piece of the holding member,
The optical device, wherein the holding frame is fixed to the holding member via the spacer. The optical device according to claim 1.
The optical device is characterized in that the holding frame includes a concave frame that houses the light modulation device and a support plate that presses and fixes the light modulation device housed. The optical device according to claim 1.
The holding frame is configured by a support member that supports a light incident side of the light modulation device,
The light emitting side of the light modulation device is held by the holding member. The optical device according to claim 3.
The optical device, wherein the spacer is provided between a light emission surface of the light modulation device and a surface of the holding member on the light modulation device side. The optical device according to any one of claims 1 to 4,
The optical device, wherein the holding member is made of a light transmissive material. The optical device according to claim 5.
The optical device, wherein the holding frame and the holding member are fixed by a photocurable adhesive. The optical device according to any one of claims 1 to 4,
The optical device, wherein the holding member is made of metal. The optical device according to claim 7.
The optical device, wherein the holding frame and the holding member are fixed by a thermosetting adhesive. The optical device according to any one of claims 1 to 8,
The optical device is characterized in that the pedestal is fixed to both of a pair of end surfaces intersecting with a light beam incident end surface of the color synthesis optical element. The optical device according to claim 9.
The optical device according to claim 1, wherein the pedestal has a recess formed in a part of an end surface to which the holding member is bonded and fixed. The optical device according to claim 9 or 10,
An optical apparatus, wherein a side surface of the pedestal protrudes beyond a light beam incident end surface of the color combining optical element. The optical device according to any one of claims 1 to 11,
The pedestal is fixed only to one of a pair of end surfaces intersecting with a light beam incident end surface of the color combining optical element,
In the vicinity of the other end surface, a connecting member that connects the holding members facing each other is provided. The optical device according to claim 12, wherein
An optical device, wherein at least two of the pedestal, the holding member, and the connecting member are integrally formed. The optical device according to any one of claims 1 to 13,
The optical device is attached to an optical component casing in which optical components constituting an optical apparatus are arranged along a predetermined optical axis,
At least one of the pedestals is formed with an attachment portion that is fixed to the optical component casing. The optical device according to any one of claims 1 to 14,
The optical modulation device includes a pair of substrates and a light transmissive dustproof plate fixed to at least one of the pair of substrates.   16. A projector comprising: the optical device according to claim 1; and a projection lens that projects an image formed by the optical device. A method of manufacturing an optical device in which a plurality of light modulation devices that modulate a plurality of color lights for each color light according to image information and a color combining optical element that combines each color light modulated by the light modulation device are integrated. And
A pedestal fixing step of fixing a pedestal to at least one of a pair of end surfaces intersecting with a light beam incident end surface of the color combining optical element;
Attaching each of the plurality of light modulation devices to a holding frame;
A holding frame attaching step for closely attaching the holding frame to the holding member using an adhesive;
A holding member mounting step for closely attaching the holding member to the side surface of the base using an adhesive;
Inserting a spacer coated with an adhesive between the light modulation device and the holding member;
A position adjustment step of adjusting the positions of the plurality of light modulation devices in the uncured state of the adhesive,
An adhesive curing step for curing the adhesive after the position adjusting step,
In the position adjustment step, when the predetermined optical axis is the Z axis and the two axes orthogonal to the Z axis are the X axis and the Y axis,
Adjustment of the Z-axis direction and the rotation direction around the X-axis and the Y-axis is performed via the spacer between the holding frame and the holding member,
The method of manufacturing an optical device, wherein the adjustment in the X-axis direction, the Y-axis direction, and the rotation direction in the XY plane is performed between the holding member and the pedestal.

Images