JP4042766B2 - Optical device and projector - Google Patents

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, and a projector that employs the optical device. About.

  The mounting structure of the liquid crystal panel and the prism in the projector is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-221587 or Japanese Patent Application Laid-Open No. 2000-221588. In these publications, the liquid crystal panel is housed in a panel frame and attached to a prism to improve the assemblability and reliability of this portion. The cooling of the liquid crystal panel has a structure almost depending on the cooling in the air path provided between the panel frame and the prism.

However, in recent years, miniaturization and high brightness of the projector have been promoted, and the heat density in the apparatus has increased compared to the conventional one. Therefore, in the structure where the cooling of the liquid crystal panel mainly depends only on the air path, However, it has been difficult to sufficiently exhibit the performance of the liquid crystal panel because the heat dissipation measures, especially the liquid crystal panel cannot be sufficiently cooled.
The present invention has been made to solve the above-described problems, and provides an optical device capable of further improving the cooling performance, thereby reducing the size, the brightness, and the reliability of the projector. It is something that tries to contribute.

In the optical device of 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 color lights modulated by the light modulation device are integrated. An optical device provided, the holding frame holding the light modulation device and having an opening in a portion corresponding to an image forming region 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 a pair of intersecting end surfaces, an upright piece formed to cover a side edge of the holding frame, and a support that supports a surface of the holding frame on the color combining optical element side A holding member that is directly fixed to the pedestal, and a spacer that is disposed between the holding frame and the standing piece of the holding member, the pedestal and the holding member Has a thermal conductivity of 3 W / (m · K) or higher . The holding frame is fixed to the holding member via the spacer, and the light combining end face of the color combining optical element is heated by a material that forms the color combining optical element. A light-transmitting plate having high conductivity is provided, and the light-transmitting plate and the pedestal are coupled so as to be able to conduct heat .
According to the present invention as described above, since the holding member and the pedestal are made of the heat conductive metal or the heat conductive resin having good heat conductivity, the heat generated in the light modulation device is held. It is possible to dissipate heat by letting it escape from the member to the base. Therefore, it is possible to prevent malfunction due to the temperature rise of the light modulation device and greatly improve the cooling performance of the light modulation device.
Further, since the cooling performance of the light modulation device is improved, the light flux from the light source can be increased, and the brightness of the image projected on the screen can be increased.
Furthermore, when a fan is used for cooling the optical device, the fan can be reduced in size.
The phrase “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, a case where a sapphire substrate or a metal plate for improving heat dissipation is interposed between the side surface of the base and the holding member is also included in the present invention.

The thermal conductivity of the thermally conductive metal or a thermally conductive resin since it is 3W / (m · K) or more, be rapidly dissipate heat generated in the light modulation device by following the above-mentioned heat conduction path it can. Moreover, the material of the holding member and the pedestal can be freely set within a range that satisfies the condition of 3 W / (m · K) or more, and can be made into a material according to the request. Therefore, when designing the optical device, the material can be optimized according to the required performance.
Furthermore, a light transmissive plate having a higher thermal conductivity than the material forming the color synthesizer optical element is provided on the light incident end face of the color synthesizer optical element, so that the light transmissive plate and the pedestal can conduct heat. Since it is couple | bonded, the more efficient heat conduction path | route which consists of a holding member-a light-transmitting board-a base can be comprised. Therefore, even if the color synthesis optical element is made of a material having a relatively low thermal conductivity, it is possible to maintain high heat dissipation performance. Examples of such a light transmissive plate include sapphire, quartz, quartz, and the like, which have higher thermal conductivity than general glass. Further, at this time, the light transmissive plate and the pedestal may be bonded with a heat conductive adhesive, or may be bonded via a heat conductive sheet, a spacer member made of a heat conductive material, or the like. . Thus, the heat dissipation characteristic in the said heat conduction path | route can be improved by couple | bonding a light transmissive board and a base via a heat conductive adhesive etc. with favorable heat conductivity.

In the optical device according to the aspect of the invention, it is preferable that the pedestal has a recess formed in a part of an end surface to which the holding member is bonded and fixed.
According to such a configuration, when a fan is used for cooling the optical device, this recess can be used as a cooling air flow path. Therefore, the optical device can be efficiently cooled.

In the optical device according to the aspect of the invention, it is preferable that the holding frame, the holding member, and the pedestal are fixed by an adhesive configured to include a metal material . According to such a configuration, since the adhesive interposed between the members assists heat transfer between the members, the heat dissipation performance can be further improved.

In this case, it is preferable that a gap between the upright piece and the holding frame is filled with an adhesive configured to include a metal material .
According to such a configuration, since the bonding area between the holding frame and the holding member is widened, the heat generated in the light modulation device can be quickly radiated to the holding member, and the cooling efficiency of the light modulation device is further improved. Can be made.

Wherein the adhesive, because it is configured to include a metallic material, the use of such adhesives, metallic material in the adhesive is sandwiched between the members, connecting these members thermally Thus, heat transfer between the members is further promoted.

In the optical device according to the aspect of the invention, the pedestal is fixed to only one of a pair of end surfaces intersecting with a light beam incident end surface of the color combining optical element, and the holding members facing each other are in the vicinity of the other end surface. Tei Rukoto coupling member is provided for connecting the preferred.
With such a configuration, not only heat dissipation by heat transfer from the holding member to the pedestal but also heat dissipation by the holding member to the connecting member is possible. Therefore, the cooling performance of the light modulation device can be further improved.

  At this time, it is preferable that at least two of the pedestal, the holding member, and the connecting member are integrally formed. With such a configuration, the heat radiation to the holding member to the pedestal and the holding member to the connecting member becomes smoother, and the cooling performance of the light modulation device can be further improved.

In this case, it is preferable 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.
When the holding frame has such a configuration, the contact area between the light modulation device and the holding frame increases. Therefore, the heat generated in the light modulation device can be efficiently radiated to the holding frame, and the cooling efficiency of the light modulation device can be improved.

In the optical device according to the aspect of the invention, 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, and heat conduction of the light-transmitting dustproof plate. The rate is preferably higher than the thermal conductivity of the substrate.
In this way, if the light modulation device is provided with a light-transmitting dustproof plate having a higher thermal conductivity, it is possible to prevent dust from adhering to the substrate of the light modulation device, and also from the surface of the light modulation device. Since it is possible to dissipate heat, the cooling performance of the light modulation device can be further improved. Therefore, it is possible to reduce image quality due to dust adhering to the substrate of the light modulation device, and to reduce image quality due to deterioration of the performance of the light modulation device due to heat. Such an optical device is employed. The image quality of an optical device such as a projector can be improved.

In the optical device according to the aspect of the invention, it is preferable that the base is connected to a heat dissipation device that performs forced cooling.
As described above, the heat generated in the light modulation device is released to the pedestal through the holding member. Therefore, if a heat radiating device that performs forced cooling is connected to the base, the cooling efficiency of the light modulation device can be further improved.

  The optical device of the present invention described above can be used in a projector including a projection lens that projects an image formed by the optical device. When the optical device of the present invention is employed in such a projector, the cooling performance of the light modulation device is improved, so that it is possible to prevent a malfunction due to a temperature rise of the light modulation device, and thus high image quality is achieved. Can be maintained. Further, since the light flux from the light source can be increased, the brightness of the image projected on the projection surface such as a screen can be increased. Further, when a fan is used for cooling the optical device, the fan can be reduced in size, so that the projector can be reduced in size.

[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 outer case 2 includes an upper case 21 and a lower case 23 each made of a heat conductive member. These cases 21 and 23 are fixed to each other with screws.
Here, as an example of the heat conductive member constituting the outer case 2, a light and good heat conductivity, such as Al, Mg, Ti, alloys thereof, carbon steel, brass, stainless steel, or carbon Examples thereof include resins (polycarbonate, polyphenylene sulfide, liquid crystal resin, etc.) mixed with carbon fillers such as fibers and carbon nanotubes.
Further, it is not necessary to configure the entire outer case with the same material, and it is possible to make a part made of resin and other parts made of metal. For example, the upper case 21 may be made of resin, and the lower case 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 in which the upper surface portion of the projection lens 46 is exposed is provided on the side of the lamp cover 24, and the zoom operation and the focus operation of the projection lens 46 can be performed manually via a lever. It is like that. 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 212B is located on the front side of the internal power supply unit 3. A cooling air is exhausted in a direction away from the image projection area, that is, the left side in FIG. 1, and an exhaust louver 26 having a light shielding function is provided (the exhaust louver 26 is actually attached to the lower case 23). ing).

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 part 232 is provided with an attachment part 232A for rotatably attaching the U-shaped handle 29.

On one side of the exterior case 2, a side foot 2 A that serves as a foot when the projector 1 is stood with the handle 29 on the side 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 portion 2B is provided that extends across the back portion 213 of the upper case 21 and the back portion 233 of the lower case 23, and an interface cover 215 is provided in the interface portion 2B. Further, 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 driving 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.

  These power supply unit 3 and optical unit 4 are covered with a surrounding 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 the 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 type 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 the polarization direction is aligned 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 as a casing for optical components, as shown in FIGS.
Here, the upper housing 472 and the lower housing 471 are preferably formed of a heat conductive member. Examples of such heat conductive members are lightweight, good heat conductivity, Al, Mg, Ti and their alloys, carbon steel, brass, stainless steel, or carbon fibers, carbon nanotubes, etc. Examples thereof include resins mixed with a carbon filler (polycarbonate, polyphenylene sulfide, liquid crystal resin, etc.).
This optical component housing 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. 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 that mainly cools 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 inlet 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 incident side and the light emitting side thereof upward from below. 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 for accommodating the respective 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, in this embodiment, the base 445, the holding member 446, and the holding frame 443 are made of a magnesium alloy. However, the material of each of these members is not limited to a magnesium alloy. For example, lightweight, good thermal conductivity, Al, Mg, Ti and their alloys, carbon steel, brass, stainless steel and other resin or carbon fiber, carbon nanotubes and other resin mixed with polycarbonate (polycarbonate, Polyphenylene sulfide, liquid crystal resin, etc.) may be used. Moreover, it is preferable to employ a metal (including an alloy) or a resin having a thermal conductivity of 3 W / (m · K) or more as the material of each of these members. The thermal conductivity of the optical glass, which is a general material of the cross dichroic prism 45, is about 0.7 W / (m · K). This is because it is considered that the improvement of the above can be sufficiently expected. Table 1 (a) shows an example of a material having a thermal conductivity of 3 W / (m · K) or more. Table 1 (b) shows an example of a material having a thermal conductivity lower than 3 W / (m · K) as a comparative example.

In Table 1 (a), CoolPoly is a trade name (registered trademark) of a thermally conductive resin of Cool Polymer, and a product number is shown in parentheses.
The materials listed in Table 1 (a) are examples of thermally conductive metals and thermally conductive resins that can be employed as materials for the base 445, the holding member 446, and the holding frame 443. In Table 1 (a), brass is shown as the material having the highest thermal conductivity. However, the thermal conductivity of the material constituting each member may of course be higher than that.

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 recess 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, the liquid crystal panel 441R 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). Liquid crystal is sealed between 441A and a counter substrate (for example, a substrate on which a common electrode is formed) 441E, and a control cable 441C extends between these glass substrates. On the drive substrate 441A and the counter substrate 441E, normally, the light transmission for shifting the position of the panel surface of the liquid crystal panel 441 from the back focus position of the projection lens 46 to make the dust adhering to the panel surface optically inconspicuous. A dustproof plate 441D is fixed. As the light transmissive dustproof plate, a material having good thermal conductivity such as sapphire, quartz, or quartz is used. The thermal conductivities of sapphire, quartz, and quartz are 42 W / (m · K), 9 W / (m · K), and 1.38 W / (m · K), respectively. 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-transmitting 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 each other by hooks 444D provided on the left and right sides of the support plate 444B and hooks provided at 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 region. 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 across 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 446A on the light beam exit side in the same manner as 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, 441B are attached, , 441G, 441B and the 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. First,
(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 coated with adhesive 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 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 and fixed (adhesive curing step).
The optical device is manufactured by the process procedure as described above.
In the above manufacturing process, a thermosetting adhesive or a photocuring adhesive having good thermal conductivity is used as the adhesive. As described above, as an adhesive having good thermal conductivity, there is an acrylic or epoxy adhesive containing a metal such as silver palladium.

(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 is performed with the joint surface between the side surface of the base 445 and the holding member 446 as a sliding surface, and the joint portion between the holding frame 443 and the holding member 446 is adjusted. That is, focus adjustment is performed by sliding the holding frame 443 via the pin 447A. Here, the alignment adjustment refers to the X-axis direction, the Y-axis direction, and the rotation direction in the XY plane when the optical axis direction of the projection lens 46 is the Z-direction and the two axes orthogonal thereto are the X- and Y-axes. This means adjustment in the (θ direction). Focus adjustment means adjustment of the Z-axis direction, the rotation direction about the X axis (Xθ direction), and the rotation direction about the Y axis (Yθ direction). 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. In addition, 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 with hot air, ultraviolet rays, 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 using solder as the adhesive, in the manufacturing steps (d) and (e), each member is mounted without using the adhesive, 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.

(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 above method is shown in FIGS. 10, 11, and 14, as shown in FIG. 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. As shown in FIG. 9, an appropriate grip portion 445E is provided in the central square portion of the attachment portion 445B so that the operator can easily grip the portion at the time of attachment / detachment.

  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 mounted on 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, since the recess 445A formed in a part of the end surface of the pedestal 445 serves as a cooling air flow path, the heat transmitted to the holding member 446 and the pedestal 445 can be efficiently cooled.

  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) Since the pedestal 445, the holding member 446, and the holding frame 443 are made of a magnesium alloy having high thermal conductivity, the liquid crystal panels 441R, 441G, 441B and the polarizing plates are irradiated with light emitted from the light source lamp 411. By releasing the heat generated in 442 in the order of the holding frame 443 to the holding member 446 to the pedestal 445, heat can be quickly radiated. Therefore, heat can be efficiently released from the liquid crystal panels 441R, 441G, and 441B and the polarizing plate 442, and malfunction due to temperature rise of the liquid crystal and deterioration of the polarizing plate 442 can be prevented. In addition, the cooling performance of each of the liquid crystal panels 441R, 441G, 441B can be greatly improved. Further, along with this, the light quantity of the light source lamp 411 can be increased, so that the brightness of the image projected on the screen can be increased. Furthermore, the sirocco fans 51 and 52 used for cooling the optical device can be reduced in size.

(2) Since the pedestal 445, the holding member 446, and the holding frame 443 are made of the same material, the amount of dimensional change (expansion and contraction) due to heat of each member is the same, so that functional reliability is dramatically improved. To do.
(3) Since the pins 447A provided in the holding member 446 and the holes 443D provided in the holding frame 443 are fixed by an adhesive having thermal conductivity, the liquid crystal panels 441R, 441G, 441B and the polarizing plate 442 are provided. It is possible to efficiently release the heat generated in. Such a structure contributes to the improvement of heat dissipation performance.
(4) An engaging groove 446C is formed in the holding member 446, and a polarizing plate 442 in which a polarizing film is attached on a sapphire substrate with a transparent adhesive so as to engage with the engaging groove 446C. It is fixed. Therefore, the heat generated in the polarizing film can be released to the sapphire substrate having a high thermal conductivity, and further, the heat transmitted to the sapphire substrate can be released to the holding member 446. Therefore, the temperature rise of the polarizing plate 442 and the difference in temperature distribution in the surface can be alleviated and deterioration due to heat can be prevented. Note that optical elements other than the polarizing plate 442, such as a phase difference plate and an optical compensation plate, can be engaged with the engagement groove 446C.

(5) The holding frame 443, the holding member 446, and the base 445 are fixed by an adhesive having thermal conductivity. This adhesive assists heat transfer from the holding frame 443 to the holding member 446 to the base 445. Such a structure contributes to the improvement of heat dissipation performance.
(6) On one peripheral edge of the intake side opening 471C provided on the bottom surface of the lower housing 471, an upright portion 471D rising from the bottom surface of the lower housing 471 is located, and its upper end is a cross dichroic prism. The cooling air of the panel cooling system A surely flows into the gaps between the liquid crystal panels 441R, 441G, 441B and the cross dichroic prism 45 because it is close to the lower end surface of the pedestal 445 fixed to the lower surface of 45. Therefore, the liquid crystal panels 441R, 441G, 441B and their peripheral parts can be efficiently cooled.

(7) Since the rising piece 478A of the rectifying plate 478 protrudes upward from the intake side opening 471C, the cooling air can be reliably guided from below to the upper liquid crystal panels 441R, 441G, 441B and the polarizing plate 442 side. Further, it is possible to more efficiently cool the liquid crystal panels 441R, 441G, and 441B and their peripheral parts by suppressing the cooling air from leaking into the optical component casing 47.
(8) Furthermore, since the recess 445A is formed in a part of the end surface of the base 445, a gap is formed between the holding member 446 and the side of the base 445. In addition, since the concave portion 446N is formed in the rectangular plate-like body 446A of the holding member 446, a gap is formed between the holding frame 443 and the holding member 446. Therefore, the cooling air guided upward from below by the rising portion 471D rising from the bottom surface of the lower housing 471 and the rising piece 478A of the rectifying plate 478 can be caused to flow into these gaps, and the liquid crystal panels 441R, 441G, 441B. In addition, the polarizing plate 442 can be cooled more efficiently.
(9) Since the holding frame 443 includes the concave frame 444A and the support plate 444B, the contact area between the liquid crystal panels 441R, 441G, and 441B and the polarizing plate 442 and the holding frame 443 is large. With such a structure, heat generated in the liquid crystal panels 441R, 441G, and 441B can be efficiently released to the holding frame 443, so that high heat dissipation performance can be obtained.

[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 a rectangular plate-like body 446A and 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. In addition, the materials described in the first embodiment can be used for the material of each component.
Specifically, the upright pieces 447B are located at the four corners of the rectangular plate-like body 446A and project along the edge of the rectangular plate-like body 446A, and accommodate the liquid crystal panels 441R, 441G, 441B. The outer periphery of the holding frame 443 is configured to be held. And the standing piece 447B and the end surface of the holding frame 443 are bonded together by an adhesive having thermal conductivity. 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 such 2nd Embodiment, it is possible to acquire the effect similar to said (1)-(2), (4)-(9) described by description of 1st Embodiment.
Further, the upright pieces 447B are located at the corners of the rectangular plate-like body 446A, and project so as to extend along the edge of the rectangular plate-like body 446A. The upright pieces 447B and the holding frame 443 are provided. Are fixed by an adhesive having thermal conductivity, heat generated in the liquid crystal panels 441R, 441G, 441B and the polarizing plate 442 can be efficiently released. Such a structure contributes to the improvement of heat dissipation performance. In addition, since the upright pieces 447B are projected from the four corners of the rectangular plate-like body 446A, the influence of external force applied to the liquid crystal panels 441R, 441G, 441B and the polarizing plate 442 by heat can be reduced, and thus the liquid crystal The panels 441R, 441G, and 441B and the polarizing plate 442 can be stably held.

[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 a rectangular plate-like body 446A and 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. In addition, as the material of each component, those described in the first embodiment can be used.
Specifically, the upright pieces 447C are located at the corners of the rectangular plate-like body 446A, projecting so as to extend along the edge of the rectangular plate-like body 446A, and each of the liquid crystal panels 4441R, 441G, 441B. It is comprised so that the outer periphery of the holding frame 443 which accommodates may be hold | maintained. The pair of parallel sides of the standing piece 447C has the same length as the pair of sides of the rectangular plate-like body 446A, and the pair of parallel sides of the standing piece 447C is the same as that of the rectangular plate-like body 446A. It has the same length as a pair of sides. And the standing piece 447C and the end surface of the holding frame 443 are bonded by an adhesive having thermal conductivity.

According to such 3rd Embodiment, it is possible to acquire the effect similar to said (1)-(2), (4)-(9) described by description of 1st Embodiment.
Further, the upright pieces 447C are located at the corners of the rectangular plate-like body 446A, and are projected so as to extend along the edge of the rectangular plate-like body 446A. The upright pieces 447C and the holding frame 443 are provided. Are fixed by an adhesive having thermal conductivity, heat generated in the liquid crystal panels 441R, 441G, 441B and the polarizing plate 442 can be efficiently released. Such a structure contributes to the improvement of heat dissipation performance. Further, since the upright pieces 447C are provided along a pair of parallel sides of the rectangular plate-like body 446A and have substantially the same length as the sides of the rectangular plate-like body, the holding frame 443 and the holding member The contact portion with 446 can be made larger, so that the heat dissipation performance can be further improved.

[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 the light beam 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 pedestal 445 of the pair of end surfaces intersecting the light beam incident end surface of the cross dichroic prism 45, Only on one side. 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.
The rectangular plate-like body 446A is formed with rectangular openings 446B corresponding to the image forming areas of the respective liquid crystal panels 441R, 441G, 441B, and the upper and lower edges and the opening 446B of the rectangular plate-like body 446A. Cutout portions 446L for absorbing the 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. . 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 the substantially central portion of the light beam incident end face of the cross dichroic prism 45.
Configurations other than those described above are the same as in the first embodiment. In addition, the materials described in the first embodiment can be used for the material of each component.

Next, with reference to FIG. 17, a method for manufacturing the optical device according to the present embodiment will be described in detail. First,
(a) First, the base 445 is fixed to the upper surface of the cross dichroic prism 45 by 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) An ultraviolet curable adhesive is applied to the end face of the cross dichroic prism 45 opposite to the pin 447A of the holding member 446, and is adhered to the end face of the cross dichroic prism 45 (holding member). Mounting process). 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).

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 X-axis direction, Xθ direction, and 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. In addition, 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 with 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 the liquid crystal panel 441G cured and fixed after the position adjustment as a reference.

According to such 4th Embodiment, there exist the following effects.
(10) Since the pedestal 445, the holding member 446, and the holding frame 443 are made of a magnesium alloy having high thermal conductivity, the liquid crystal panels 441R, 441G, 441B, and optical compensation are made by the light emitted from the light source lamp 411. The heat generated by the plate and the polarizing plate 442 can be radiated in the order of the holding frame 443 to the holding member 446 to the prism 45 to the base 445. Therefore, heat can be efficiently released from each of the liquid crystal panels 441R, 441G, and 441B, the optical compensation plate, and the polarizing plate 442, and malfunction due to a rise in liquid crystal temperature and deterioration of the optical compensation plate can be prevented. In addition, the cooling performance of each of the liquid crystal panels 441R, 441G, 441B can be greatly improved. Further, along with this, the amount of light from the light source lamp 411 can be reduced, so that the brightness of the image projected on the screen can be increased. Furthermore, the sirocco fans 51 and 52 used for cooling the optical device can be reduced in size.
(11) Since the pedestal 445, the holding member 446, and the holding frame 443 are made of the same material, the amount of dimensional change (expansion and contraction) due to heat of each member is the same, so that functional reliability is dramatically improved. To do.

(12) Since the pin 447A provided in the holding member 446 and the hole 443D provided in the holding frame 443 are fixed by an adhesive having thermal conductivity, heat generated in the liquid crystal panels 441R, 441G, 441B. Can be efficiently missed. Such a structure contributes to the improvement of heat dissipation performance.
(13) The holding frame 443, the holding member 446, the prism 45, and the pedestal 445 are fixed by an adhesive having thermal conductivity. This adhesive assists heat transfer from the holding frame 443 to the holding member 446 to the prism 45 to the base 445. Such a structure contributes to the improvement of heat dissipation performance.
(14) The support surface 446M provided on the left and right edges of the holding member 446 protrudes in a direction away from the prism 45, that is, in an out-of-plane direction, rather than a portion bonded to the prism 45 of the rectangular plate-like body 446A. Is formed. Accordingly, there are gaps between the prism 45 and the optical element fixed to the support surface 446M and between the optical element and the holding frame 443. Accordingly, the cooling air guided upward from below by the rising portion 478D rising from the bottom surface of the lower housing 471 and the rising piece 478A of the rectifying plate 478 can flow into these gaps, and the liquid crystal panels 441R, 441G, 441B. In addition, the optical element can be cooled more efficiently.
Further, in the present embodiment, it is possible to obtain the same effects as the above (6), (7), and (9) described in the description of the first embodiment.

The four right-angle prisms constituting the cross dichroic prism 45 are generally formed of optical glass. However, these right-angle prisms may be formed of a material having higher thermal conductivity than that of optical glass, such as sapphire or quartz. The cross dichroic prism 45 is configured such that the cross mirror is housed in a box-shaped container and filled with a liquid having a higher thermal conductivity than that of the optical glass, so that the holding frame 443 to the holding member 446 to the prism 45 to the base. Heat transfer to 445 becomes smoother and heat dissipation performance is improved. The same applies to other embodiments in which the holding member 446 is fixed to the light beam incident end face of the cross dichroic prism 45.
In this embodiment, an optical compensation plate is fixed to the support surface 446M of the holding member 446, and the polarizing plate 442 is fixed to the light beam incident end surface of the cross dichroic prism 45, but the support surface 446M has The polarizing plate 442 may be fixed instead of the optical compensation plate. The optical element fixed to the support surface 446M is not limited to an optical compensation plate or a polarizing plate, but includes a retardation plate (a quarter wavelength plate, a half wavelength plate, etc.), a condenser lens, and the like. It may be fixed.

  Instead of the holding member 446 of this embodiment, the 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 engaging groove 446C ( (See FIGS. 9, 15, and 16). In this case, in this embodiment, instead of the effect obtained based on the holding member 446, it is possible to obtain the effect obtained based on the holding member 446 of the first to third embodiments. Conversely, an optical compensation plate or the like may be fixed to the support surface 446M by using the holding member 446 of this embodiment instead of the holding member 446 of the first to third embodiments. In this case, in the first to third embodiments, it is possible to obtain an effect obtained based on the holding member 446 used in these optical devices.

[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 in the fourth embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the optical device according to the fourth embodiment, the polarizing plate 442 is directly fixed to the light beam incident end surface of the cross dichroic prism 45 by using a double-sided tape or an adhesive, and the rectangular plate-like body 446A of the holding member 446 has left and right edges. In addition, a support surface 446M is formed so that an optical compensator can 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 compensation plate are fixed to these support surfaces 446M and 446M1. This is different from the fourth embodiment. Other configurations and manufacturing methods are the same as those in the fourth embodiment. In addition, the materials described in the first embodiment can be used for the material of each component.

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 to have different height dimensions (out-of-plane direction position) 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. Is done. 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.
By fixing the polarizing plate 442 and the optical compensation plate 450 to the holding member 446, heat generated in the polarizing plate 442 and the optical compensation plate 450 can be released to the holding member 446, and the polarizing plate 442 and the optical compensation plate 450 are discharged. The cooling efficiency can be improved and deterioration can be prevented.
In addition, since the holding member 446 includes two types of support surfaces 446M and 446M1 having different positions in the out-of-plane direction, the polarizing plate 442 and the optical compensation plate 450 can be supported by the holding member 446 at different positions. . Accordingly, a gap is formed between the prism 45, the polarizing plate 442, the optical compensation plate 450, and the holding frame 443. Accordingly, the cooling air guided upward from below by the rising portion 471D rising from the bottom surface of the lower housing 471 and the rising piece 478A of the rectifying plate 478 can flow into these gaps, and the liquid crystal panels 441R, 441G, 441B. In addition, the optical element can be cooled more efficiently.
The optical elements fixed to the support surfaces 446M and 446M1 are not limited to optical compensators and polarizing plates, but are retardation plates (quarter wave plates, half wave plates, etc.), condenser lenses, and the like. May be.
Further, instead of the holding member 446 of the first to third embodiments, the optical compensation plate or the like may be fixed to the support surfaces 446M and 446M1 by using the holding member 446 of this embodiment. In this case, in the first to third embodiments, it is possible to obtain an effect obtained based on the holding member 446 used in these optical devices.

[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 446 is bonded and fixed to the side surface of the pedestal 445. It was.
The cross dichroic prism 45 is suspended and fixed to the lower housing 471 via a base 445 fixed to the upper surface.
In addition, 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 a mounting 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 quartz cross dichroic prism 45 mounted and fixed on the pedestal 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 includes an opening 446 </ b> B substantially at the 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 are formed. In addition, convex portions 446F are formed on both the left and right sides on the light emission side. The convex portion 446 </ b> F forms a partial gap between the cross dichroic prism 45 and the holding member 446. And this clearance gap forms the air path for cooling optical elements, such as a change board arrange | positioned in liquid crystal panel 441R, 441G, 441B and its peripheral part. Joint surfaces 446G to the cross dichroic prism 45 are provided on the upper and lower end surfaces 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. In addition, 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, and a pixel is provided between the width of the holding frame 443 and the interval between the rising pieces 446D of the holding member 446. Provide alignment adjustment clearance for alignment. 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. Like the base 445, the holding member 446, and the holding frame 443, the wedge-shaped spacer 448A is composed of a thermally conductive metal or a thermally conductive resin (preferably having a thermal conductivity of 3 W / (m · K) or more). . Examples of such metals and resins are as described above in the description of the first embodiment. In addition, since the wedge-shaped spacer 448A is used for bonding the holding frame 443 and the holding member 446, considering a 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 A material having a thermal expansion coefficient between the holding frame 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 method for manufacturing the optical device according to the present embodiment will be described. First,
(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 panel 441R is housed in 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 accommodated. 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 storing and holding the liquid crystal panels 441R, 441G, and 441B is stored between the left and right upright pieces 446D of the holding member 446 and brought into contact with the support piece 446K (holding frame mounting step).
(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 448A are uncured. (Position adjustment process).
(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, and the like) is performed with 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. Focus adjustment (adjustment in the Z-axis direction, Xθ direction, and Yθ direction) is performed by sliding the joint surface 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. In addition, 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 with 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.
In the above manufacturing process, as the adhesive, an adhesive having good thermal conductivity similar to that described in the first embodiment is used.

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 solder is used as an adhesive, each member is mounted without using an adhesive in the manufacturing steps (d), (e-1), and (e-2), and the position adjustment in (f) is performed. Then, the cross dichroic prism 45, the holding member 446, the spacer 448A, and the holding frame 443 may be fixed with solder. In the manufacturing process (e-2), the 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. Alternatively, the gap between the outer periphery of the holding frame 443 and the upright piece 446D may be filled in advance with a heat conductive adhesive, and the wedge-shaped spacer 448A may be inserted there. The same applies to the optical devices of other embodiments manufactured by the same manufacturing method as the present 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 sixth embodiment as described above, it is possible to obtain the same effects as the (10), (11), and (13) described in the description of the fourth embodiment.
In addition, the holding member 446 includes a convex portion 446 </ b> F 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. This gap forms an air path for cooling the optical elements such as the polarizing plates disposed in the liquid crystal panels 441R, 441G, and 441B and the peripheral portions thereof. It is possible to prevent deterioration of the optical element that has been caused by heat, which contributes to improvement in image quality.
Further, if the gap between the outer periphery of the holding frame 443 and the upright piece 446D is filled with the heat conductive adhesive, the bonding area between the holding frame 443 and the holding member 446 is increased. Therefore, the heat generated in the liquid crystal panels 441R, 441G, and 441B can be quickly radiated to the holding member 446, and the cooling efficiency of the light modulation device can be further improved.
Furthermore, in the present embodiment, it is possible to obtain the same effects as the above (6), (7), and (9) described in the description of the first embodiment.

[Seventh Embodiment]
Next, a seventh embodiment of the present invention will be described.
In the following description, the same reference numerals are given to the same structures and the same members as those in the sixth embodiment, and the 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 using two wedge-shaped spacers 448A on the left and right sides.
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 between the holding frame 443 and the holding member 446 is formed at the upper and lower ends. The other configuration is the same as that of the sixth embodiment.
According to such 7th Embodiment, it is possible to acquire the effect similar to 6th Embodiment.
Further, by using one wedge-shaped spacer 448B on each of the left and right sides and arranging the wedge-shaped spacer 448B over the entire length of the inclined surface 446E of the upright piece 446D, the contact area between the wedge-shaped spacer 448B and the holding frame 443 is increased. The heat dissipation characteristic from the frame 443 to the wedge-shaped spacer 448B can be further improved, and thus the cooling efficiency of the liquid crystal panels 441R, 441G, 441B can be further improved.

[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 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, it is possible to obtain the same effect as that of 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 of 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 with 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 held 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, it is possible to acquire the effect similar to 6th Embodiment.
In addition, since the holding frame 443F is configured only by the concave frame that supports the light incident side of each of the liquid crystal panels 441R, 441G, 441B, as in the first to eighth embodiments described above, the support plate The hook engaging part for fixing 444B becomes unnecessary, and the concave frame body 444A can be made into a simple shape using a thinner plate material. Further, the liquid crystal panels 441R, 441G, 441B are in direct contact with the holding member 446. Therefore, the heat conduction from the liquid crystal panels 441R, 441G, and 441B to the holding member 446 is further promoted, and the heat radiation characteristics can be further improved.
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 upright 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 441R, 441G, and 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 while the adhesive is uncured. Further, the adhesive may be applied and cured after adjustment.

[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 with 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, and 441B are stored and held in the storage space 446H of the holding member 446, and the light incident side of the liquid crystal panel 441R 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), but the holding member 446 in this embodiment has such a configuration. 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 provided. 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 upper surface 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 is inserted into the through holes 446J provided on both the left and right sides of the holding member 446, and the light on the liquid crystal panel 441R, 441G, 441B side of the holding member 446 and the liquid crystal panel liquid crystal panels 441R, 441G, 441B. The position of the liquid crystal panels 441R, 441G, and 441B is adjusted by moving while making contact with both of the emission surfaces (position adjustment process).
(G) Thereafter, the adhesive is cured (adhesive curing step).

According to the tenth embodiment, it is possible to obtain the same effect as that of the sixth embodiment.
Further, the liquid crystal panels 441R, 441G, and 441B directly contact the holding member 446. Therefore, the heat conduction from the liquid crystal panels 441R, 441G, and 441B to the holding member 446 is further promoted, and the heat radiation characteristics can be further improved.

[Eleventh embodiment]
Next, an eleventh embodiment of the present invention will be described.
In the following description, the same reference numerals are given to the same structures and the same members as those in the eighth embodiment, and the 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 a relatively high thermal conductivity is fixed to the light beam incident end face of the cross dichroic prism 45, and the holding member 446 is attached to the cross dichroic prism 45 via the sapphire plate 451. Are 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 surface 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.

Further, as shown in FIG. 32, a gap between the sapphire plate 451 and the base 445 is filled with an adhesive 449 having heat conduction, and these are coupled so as to be able to conduct heat. Other configurations are the same as those in the eighth embodiment.
In the method of manufacturing an optical device according to the present invention, a sapphire plate 451 is fixed to a light beam incident end face of a cross dichroic prism 45 by using a double-sided tape or an adhesive, and then a polarizing plate 442 is attached to the sapphire plate 451 by a double-sided tape or an adhesive. It is the same as that of 8th Embodiment except the point fixed by using an agent, and the point which fixes the holding member 446 to the light beam entrance end surface of the cross dichroic prism 45 via the sapphire plate 451.
As the adhesive that bonds the interfaces between the dichroic prism 45, the sapphire plate 451, the holding member 446, and the base 445, an adhesive having good thermal conductivity as described in the first embodiment is used.
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 or the like. 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, and 441B, heat in the vicinity of the liquid crystal panels 441R, 441G, and 441B is held by the pins 447A to 447A of the holding frame 443 to the holding member 446. Since the member 446 to the sapphire plate 451 to the pedestal 445 to the lower housing 471 can be conducted and dissipated in order, the liquid crystal panel 441R even if the prism 45 is made of glass having a relatively low thermal conductivity such as BK7. , 441G, 441B can be greatly improved in cooling performance. 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 on 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 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 stable image quality.

[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 pedestal 445 as shown in FIG. 33 or FIG. Furthermore, the upper ends of the holding members 446 facing each other 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 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 (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 slope E 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 448A 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).
In the above manufacturing process, as the adhesive, an adhesive having good thermal conductivity similar to that described in the first embodiment is used.

In the above, the pedestal 445, the holding member 446, and the connecting member 452 are configured as separate parts, and the structure in the case where the optical device is assembled and fixed together when assembled is described as shown in FIG. Alternatively, 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 panel 441R, and the liquid crystal panels 441R, 441G, 441B are pressed and held. The support plate 444B can be attached to the concave frame 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 slope E 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 448A 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).
Thus, by adopting a molding unit in which the base 445 and the holding member 446 are integrally formed in advance, the holding member fixing step and the connecting member fixing step can be omitted, and the optical device can be easily assembled. Become. 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.

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). Then, 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 a screw or the like, and in the manufacturing process (e-2), the slope 446E formed on the inner surface of the upright piece 446D and the outer peripheral surface 443E of the holding frame 443. The wedge-shaped spacer 448A to which the adhesive is applied is inserted in between, and a gap between the outer periphery of the holding frame 443 and the standing piece 446D is previously filled with a heat conductive adhesive, To insert wedge-shaped spacer 448A The same applies to the optical device of another embodiment is manufactured by the same manufacturing method and also good. In this embodiment with.
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 a twelfth embodiment, it is possible to obtain the same effects as those of (1), (2), (5), (6), (7), and (9) described in the first embodiment. Can do.
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, the temperature distribution of the holding member 446 is made uniform, and the heat transfer property is improved. Can do.
Further, if at least two of the base 445, the holding member 446, and the connecting member 452 are integrally formed, the heat radiation from the holding frame to the base and the holding member to the connecting member is smoother, and the liquid crystal panels 441R, 441G, and 441B are cooled. The performance can be further improved.
Furthermore, if the gap between the outer periphery of the holding frame 443 and the upright piece 446D is filled with the heat conductive adhesive, the bonding area between the holding frame 443 and the holding member 446 is increased. Therefore, the heat generated in the liquid crystal panels 441R, 441G, and 441B can be quickly radiated to the holding member 446, and the cooling efficiency of the light modulation device can be further 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.
On the other hand, 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, by using one wedge-shaped spacer 448B on each of the left and right sides and arranging the wedge-shaped spacer 448B over the entire length of the inclined surface 446E of the upright piece 446D, the contact area between the wedge-shaped spacer 448B and the holding frame 443 is increased. The heat dissipation characteristics from the frame 443 to the wedge-shaped spacer 448B can be further improved, and thus the cooling efficiency of the liquid crystal panels 441R, 441G, 441B can be further improved.

[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, the pins 447A that protrude from the four corners of the surface of the holding member 446 on the holding frame 443 side, and the holding frames 443 corresponding to the pins 447A. The difference is that it is performed using the holes 443D formed at the four corners. Other configurations are the same as those in the twelfth embodiment. Here, the position of the pin 447A need not 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 manufacturing method of the optical device according to the present embodiment is substantially the same as the manufacturing method of the optical device according to the twelfth embodiment, but is held in the hole 443D of the holding frame 443 in the holding frame mounting step (d-2). The difference is that the pin 447A of the member 446 is inserted together with the adhesive, and there is no spacer mounting step (e-2).

  According to the eleventh embodiment, in addition to the same effects as those in the twelfth embodiment, the same effects as in (3) described in the first embodiment can be obtained.

[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 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 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 held 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 any two of these integrally formed forming units 470. 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.

According to such a fifteenth embodiment, it is possible to obtain the same effect as that of the twelfth embodiment.
In addition, since the holding frame 443F is configured only by the concave frame that supports the light incident side of each of the liquid crystal panels 441R, 441G, 441B, the support plate 444B as in the first to eighth embodiments described above. A hook engaging portion for fixing the frame is not necessary, and the concave frame 444A can be formed into a simple shape using a thinner plate material. Further, the liquid crystal panels 441R, 441G, 441B are in direct contact with the holding member 446. Therefore, the heat conduction from the liquid crystal panels 441R, 441G, and 441B to the holding member 446 is further promoted, and the heat radiation characteristics can be further improved.
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 that allows focus adjustment or a gap that allows both focus adjustment and alignment adjustment. After adjusting the positions of 441R, 441G, and 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 while the adhesive is uncured. Alternatively, the adhesive may be applied and cured after adjustment.

[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 of the liquid crystal panels 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 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 provided. 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 holding member 446 is fixed to the three end surfaces of the base 445 by using the joint surface 446G of the convex portion 446F (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 using an adhesive having thermal conductivity (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) Wedge-like spacers 448A are inserted into through holes 446J provided on both the left and right sides of the holding member 446, and light emission on the liquid crystal panels 441R, 441G, 441B side of the holding member 446 and on the liquid crystal panels 441R, 441G, 441B side. The positions of the liquid crystal panels 441R, 441G, and 441B are adjusted by moving them in contact with both surfaces (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 such a sixteenth embodiment, the same effect as in the twelfth embodiment can be obtained. Further, the liquid crystal panels 441R, 441G, and 441B directly contact the holding member 446. Therefore, the heat conduction from the liquid crystal panels 441R, 441G, and 441B to the holding member 446 is further promoted, and the heat radiation characteristics can be further improved.

[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 relatively high thermal conductivity is fixed to the light beam 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 almost the entire surface of the light flux 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 surface corresponding to the liquid crystal panel using a double-sided tape or an adhesive. Further, the convex portion 446F of the holding member is fixed to the sapphire plate 451 with an adhesive.

Furthermore, as shown in FIG. 47, a 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. Other configurations are the same as those 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 flux incident end face 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 an adhesive that bonds the interfaces between the pedestal 445, the sapphire plate 451, and the holding member 446, an adhesive having good thermal conductivity as described in the first embodiment is used.

The base 445 and the sapphire plate 451 are coupled so as to be capable of conducting heat. Instead of filling an adhesive having thermal conductivity therebetween, a thermally conductive sheet mixed with carbon or a thermally conductive material is used. The sapphire plate 451 may be directly fixed to the lower housing 471 through a spacer member made of or the like. 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, 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, and 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 those of 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, heat in the vicinity of the liquid crystal panels 441R, 441G, 441B is applied to the holding frame 443, the holding member 446, and the sapphire plate 451. Since heat can be dissipated in the order of the base 445 to the lower housing 471, the cooling performance of the liquid crystal panels 441R, 441G, 441B even if the prism 45 is made of glass having a relatively low thermal conductivity such as BK7. Can be greatly improved. As a result, even when the brightness of the projector is increased, it is possible to suppress the deterioration of the liquid crystal panel, and it is possible to maintain a stable image quality.
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 stable image quality. Become.

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, and eleventh 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, it may have a substantially conical structure that tapers from the proximal end to the distal end. As described above, if the pin 447A has a shape whose tip side is narrower than the base end, the holding member 446 and the holding frame 443 are efficiently and surely secured in a short time by using a photo-curing adhesive such as an ultraviolet-curing adhesive. It becomes possible to fix to. This is because when the adhesive is cured by irradiating light from the tip of the pin 447A, the reflection and absorption of light at the tip of the pin 447A is reduced, and the adhesive present at the joint between the pin 447A and the holding frame 443 is used. This is because the light is sufficiently irradiated. Such a structure is particularly preferable when the holding member 446 is made of metal.

  Further, the shape of the pedestal 445 in the first to third embodiments may be tapered as shown in FIG. 49A shows a plan view of the pedestal 445, and FIG. 49B shows a cross-sectional view taken along line BB of FIG. 49A. By making the shape of the base 445 like this, 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-curing adhesive. It becomes. This is because, in order to join the pedestal 445 and the holding member 446, when ultraviolet light is irradiated from above the pedestal 445 to the gap between the pedestal 445 and the holding member 446, light is reflected or absorbed at the corners of the pedestal 445. 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 pedestal 445 is provided on both upper and lower surfaces (both the pair of end surfaces intersecting the light beam incident end surface) of the cross dichroic prism 45, but as in the twelfth to seventeenth embodiments. Alternatively, the configuration using the pedestal 445 and the connecting member 452 may be used. Conversely, the configuration of the twelfth to seventeenth embodiments using the pedestal 445 and the connecting member 452 is replaced with a configuration in which the pedestal 445 is provided on both upper and lower surfaces of the prism 45 as in the first to third embodiments. Also good.

  In the first to third 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 fixed base 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 devices 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 as in the optical devices of the first to fourth embodiments. good.

  Further, in the first to fourth embodiments, the optical device is fixed to the attachment portion 473 provided on the boss 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.

  In the twelfth to sixteenth embodiments, a 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 paths from the holding member 446 to the cross dichroic prism 45 to the base 445 are 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 arranged in a substantially rectangular parallelepiped or cubic container formed of glass or the like, and the container may be filled with a liquid. In other words, 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, Or it is applicable also to the projector using four or more light modulation apparatuses.

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. However, a reflection type light modulation device having the same 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 is 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, and a projector that employs the optical device. Available to:

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. It is a top view which expands and shows the principal part of the optical unit which concerns on embodiment of this invention. It is a disassembled perspective view showing the structure of the optical apparatus which concerns on 2nd Embodiment. It is a disassembled perspective view showing the structure of the optical apparatus which concerns on 3rd Embodiment. It is a disassembled perspective view showing the structure of the optical apparatus which concerns on 4th Embodiment. It is a 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 base which were 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 the said 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 the said 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 the said 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 base which were affixed on the 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 ... engaging groove, 446D ... standing rib, 446F ... convex, 446K ... support piece, 446M ... support surface, 446M1 ... support surface, 447A ... protrusion pin, 447B, 447C ... stand-up piece, 448A, 448B ... wedge spacer, 45 ... cross dichroic prism, 47 ... for optical components Housing, Mounting portion of the 73 ... casing.

Claims (10)

An optical apparatus 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 the respective color lights modulated by the light modulation device are integrally provided. And
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 pedestal and the holding member are composed of a thermally conductive metal or a thermally conductive resin having a thermal conductivity of 3 W / (m · K) or more ,
The holding frame is fixed to the holding member via the spacer ,
A light transmissive plate having a higher thermal conductivity than the material forming the color synthesizer optical element is provided on the light incident end face of the color synthesizer optical element. An optical device characterized in that it is coupled . The optical device according to claim 1.
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 1 or 2,
The optical device, wherein the holding frame, the holding member, and the pedestal are fixed by an adhesive that includes a metal material . The optical device according to claim 3.
An optical device, wherein a gap between the upright piece and the holding frame is filled with an adhesive including a metal material . The optical device according to any one of claims 1 to 4,
The pedestal is fixed to only one of a pair of end surfaces intersecting with a light beam incident end surface of the color combining optical element,
Other in the vicinity of the end surface, the optical device according to claim Tei Rukoto connecting member is provided for connecting the holding member facing each other. The optical device according to claim 5.
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 6,
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 any one of claims 1 to 7,
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, and the thermal conductivity of the light-transmitting dustproof plate is the heat of the substrate. An optical device characterized by being higher in conductivity. The optical device according to any one of claims 1 to 8,
The optical device is characterized in that the pedestal is connected to a heat dissipation device that performs forced cooling.   A projector comprising: the optical device according to any one of claims 1 to 9; and a projection lens that projects an image formed by the optical device.

Images