JP2005141061A - Optical apparatus and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical modulator and a projector preventing the occurrence of pixel deviation. <P>SOLUTION: In the optical apparatus, the supporting plate 51B of a holding frame 51 for storing a liquid crystal panel 441 is constituted of an alloy of iron and nickel. Then, a difference between the expansion/contraction quantity of the supporting plate 51B and that of a dust plate 441D of the liquid crystal panel 441 is reduced, then, distortion due to the difference of coefficient of linear expansion hardly occurs. Besides, the upper panel fixing plate 54A and the lower panel fixing plate 54B for fixing the supporting plate 51B of the holding frame 51 are constituted of an alloy of iron and nickel. Then, there is no difference between the coefficient of linear expansion of the panel fixing plate 54 and that of the supporting plate 51B fixed on the panel fixing plate 54, and then, the panel fixing plate 54 and the supporting plate 51B show the same dimensional change (expansion and contraction) against heat. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical device and a projector.

Conventionally, a color separation optical system that separates a light beam emitted from a light source into a plurality of color lights, a plurality of light modulation devices that modulate each color light according to image information, and a light beam modulated by each light modulation device A projector including a color synthesizing optical device is known.
Such a projector employs an optical device in which a light modulation device is fixed to a color synthesis optical device in order to reduce the size.
In such an optical device, the light modulation device is housed in a holding frame, and this is fixed to a fixing plate attached to the light beam incident end face of the color synthesis optical device (see, for example, Patent Document 1).

JP 2000-10186 A (5th to 7th pages, FIG. 5)

  Conventionally, the holding frame that accommodates the light modulation device is made of a metal such as aluminum or magnesium, and the light modulation device is made of a glass material such as quartz, so that the linear expansion between the holding frame and the substrate is performed. The difference in coefficients is large. For this reason, the expansion / contraction amount of the holding frame becomes larger than the expansion / contraction amount of the light modulation device, so that the distortion generated with the difference in expansion / compression amount is applied to the light modulation device, and as a result, this optical There is a problem that pixel shift occurs in a projected image projected through the apparatus.

  An object of the present invention is to provide a light modulation device and a projector that can prevent occurrence of pixel shift.

  An optical device of the present invention is an optical device including a light modulation device that modulates a light beam emitted from a light source according to image information, and a color combining optical device that combines optical images formed by the light modulation device. And a holding frame having a concave frame that houses the light modulation device, a support plate that presses and fixes the light modulation device to the concave frame, and the holding frame is fixed to a light beam incident end surface of the color combining optical device. The fixing plate, and at least one of the concave frame body and the support plate of the holding frame, which is fixed to the fixing plate, is made of the same material, It is an iron-nickel alloy.

According to the present invention, since at least one of the holding frame and the concave frame body or the support plate is made of iron-nickel alloy, the glass material constituting the light modulation device, for example, a dustproof plate is formed. The difference in coefficient of linear expansion from the sapphire substrate to be reduced is reduced. Thereby, the difference between the amount of expansion and contraction of the holding frame and the amount of expansion and contraction of the glass material constituting the light modulation device is reduced, and distortion due to the difference in linear expansion coefficient is less likely to occur. Thereby, it is possible to prevent occurrence of pixel shift in the projected image.
Further, in the present invention, the fixing plate that is attached to the color synthesis optical device and fixes the holding frame is also made of iron-nickel alloy. As a result, there is no difference in the coefficient of linear expansion between the fixed plate, the concave frame body of the holding frame, and any one of the support plates fixed to the fixed plate, and the fixed plate and one of the holding frames are heated. On the other hand, the same dimensional change (expansion and contraction) is exhibited. Therefore, it is possible to prevent the occurrence of distortion due to the difference between the expansion and contraction amounts between the fixed plate and the holding frame, and it is possible to prevent the occurrence of the positional deviation of the light modulation device with respect to the color synthesizing optical device that causes pixel deviation. As a result, it is possible to more reliably prevent the occurrence of pixel shift in the projected image and improve the accuracy of the image quality.
As described above, since the optical device of the present invention can prevent the occurrence of pixel shift in the projected image, it can cope with higher definition of the projected image from the optical device.

In the present invention, the iron-nickel alloy is preferably 36Ni—Fe or 42Ni—Fe.
According to the present invention, since the iron-nickel alloy is 36Ni-Fe or 42Ni-Fe, the difference in linear expansion coefficient from the glass material constituting the light modulation device, for example, the sapphire substrate constituting the dustproof plate, is reduced. It can be made smaller, and the occurrence of pixel shift in the projected image can be reliably prevented.

Furthermore, in the present invention, it is preferable that the fixed plate is attached to an end surface orthogonal to the light beam incident end surface and the light beam emission end surface of the color combining optical device.
According to the present invention, since the fixed plate is attached to the end faces orthogonal to the light beam entrance end face and the light beam exit end face of the color synthesis optical device, the thickness dimension of the optical device in the light beam transmission direction is reduced. Can do.

In the present invention, an optical conversion film for converting the optical characteristics of the light beam emitted from the light modulation device and a thermally conductive transparent film to which the optical conversion film is attached are formed on the light incident end face of the color synthesis optical device. An optical conversion plate having a substrate is attached, and a heat conductive pedestal is installed on the fixed plate, and a heat conduction plate is provided to connect the optical conversion plate and the pedestal in a heat conductive manner. It is preferable.
According to the present invention, the thermally conductive pedestal is installed on the fixed plate, and the pedestal and the optical conversion plate are connected to be thermally conductive by the thermal conductive plate. The generated heat is transmitted to the pedestal through the heat conducting plate. As a result, the optical conversion plate is dissipated.

In the present invention, it is preferable that an opening is formed in the fixed plate so as to penetrate between a surface facing the color combining optical device and a surface facing the pedestal.
According to the present invention, since the contact area between the fixing plate and the color synthesis optical device is reduced by forming the opening in the fixing plate, the heat transferred from the optical conversion plate to the base is fixed. It can be prevented that the light is transmitted to the plate and flows to the color synthesis optical device.

Furthermore, in the present invention, the support plate of the holding frame has a plurality of holes, and the fixed plate has a protruding portion that protrudes toward the holding frame and is inserted into a hole formed in the support plate of the holding frame. It is preferable that the support plate and the fixing plate are made of an iron nickel alloy.
According to the present invention, the protrusion is formed on the fixing plate, and the holding frame can be fixed to the fixing plate simply by inserting the protrusion into the hole formed in the support plate. The number of members can be reduced as compared with the case where a fixing member for fixing the holding frame is provided.

The projector of the present invention is a projector that modulates a light beam emitted from a light source according to image information and projects an enlarged optical image, and includes any one of the optical devices described above.
According to the present invention, since any one of the optical devices described above is provided, the same effects as the optical device can be obtained. That is, it is possible to prevent the occurrence of pixel shift in the projected image.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[1. First embodiment]
[1-1. Configuration of optical system]
FIG. 1 is a schematic diagram showing an optical system of a projector 1 according to this embodiment.
The projector 1 modulates a light beam emitted from a light source according to image information, and enlarges and projects it on a projection surface such as a screen. The projector 1 includes an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an optical device 44, and a projection lens 46.
The integrator illumination optical system 41 illuminates almost uniformly the image forming areas of the three liquid crystal panels 441 constituting the optical device 44 (respectively indicated as liquid crystal panels 441R, 441G, and 441B for red, green, and blue color lights). And includes a light source device 411, a first lens array 412, a second lens array 413, a polarization conversion optical element 414, and a superimposing lens 415.

  Among these, the light source device 411 includes a light source lamp 416 that is a light source that emits a radial light beam, an ellipsoidal mirror 417 that reflects the radiation emitted from the light source lamp 416, and an elliptical surface that is emitted from the light source lamp 416. A collimating concave lens 411A that converts the light reflected by the mirror 417 into parallel light. A UV filter (not shown) is provided on the plane portion of the collimating concave lens 411A. As the light source lamp 416, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is frequently used. Further, a parabolic mirror may be used instead of the ellipsoidal mirror 417 and the collimating concave lens 411A.

Further, the first lens array 412, the second lens array 413, and the polarization conversion optical element 414 are integrally combined and installed and fixed in the optical component housing 3 (see FIG. 2).
The first lens array 412 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 416 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 413 has substantially the same configuration as the first lens array 412, and has a configuration in which small lenses are arranged in a matrix. The second lens array 412 has a function of forming an image of each small lens of the first lens array 412 on the liquid crystal panel 441 together with the superimposing lens 415.

  The polarization conversion optical element 414 is disposed between the second lens array 413 and the superimposing lens 415 and is unitized with the second lens array 413. Such a polarization conversion optical element 414 converts the light from the second lens array 413 into a single type of polarized light, thereby improving the light use efficiency in the optical device 44.

Specifically, each partial light converted into one type of polarized light by the polarization conversion optical element 414 is finally superimposed on the liquid crystal panels 441R, 441G, 441B of the optical device 44 by the superimposing lens 415. 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 416 that emits randomly polarized light cannot be used.
Therefore, by using the polarization conversion optical element 414, the light emitted from the light source lamp 416 is converted into almost one type of polarized light, and the use efficiency of light in the optical device 44 is enhanced. Such a polarization conversion optical element 414 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 red light separated by the color separation optical system 42 to the liquid crystal panel 441R.

  At this time, the dichroic mirror 421 of the color separation optical system 42 reflects the blue light component of the light beam emitted from the integrator illumination optical system 41 and transmits the red light component and the green light component. The blue light reflected by the dichroic mirror 421 is reflected by the reflection mirror 423, passes through the field lens 418, and reaches the blue liquid crystal panel 441B. The field lens 418 converts each partial light beam emitted from the second lens array 413 into a light beam parallel to the central axis (principal light beam). The same applies to the field lens 418 provided on the light incident side of the other liquid crystal panels 441G and 441R.

Of the red light and green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422 and passes through the field lens 418 to reach the green liquid crystal panel 441G. On the other hand, the red light passes through the dichroic mirror 422, passes through the relay optical system 43, passes through the field lens 418, and reaches the liquid crystal panel 441R for red light. The relay optical system 43 is used for red light because the optical path length of the red light is longer than the optical path lengths of the other color lights, thereby preventing a decrease in light use efficiency due to light divergence 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 418 as it is.
The relay optical system 43 is configured to pass red light out of the three color lights, but is not limited thereto, and may be configured to pass blue light, for example.

  The optical device 44 includes three incident-side polarizing plates 442 to which the respective color lights separated by the color separation optical system 42 are incident, and a liquid crystal panel 441R as a light modulation device disposed at the subsequent stage of each incident-side polarizing plate 442. 441G, 441B, an optical conversion plate 443 disposed in the subsequent stage of each of the liquid crystal panels 441R, 441G, 441B, and a cross dichroic prism 444 as a color synthesis optical system. Among these members, the liquid crystal panel 441, the optical conversion plate 443, and the cross dichroic prism 444 are integrated to form an optical device body 5 to be described later.

The liquid crystal panels 441R, 441G, and 441B use, for example, polysilicon TFTs as switching elements, and each color light separated by the color separation optical system 42 enters these three liquid crystal panels 441R, 441G, and 441B. The side polarizing plate 442 and the optical conversion plate 443 are modulated according to image information to form an optical image.
Specifically, as shown in FIG. 4, the liquid crystal panels 441R, 441G, and 441B include a driving substrate 441A including pixel electrodes to which switching elements of TFTs are arranged in a matrix and voltage is applied by the switching elements. And a counter substrate 441C having a counter electrode corresponding to the pixel electrode. Further, on these substrates 441A or 441C, a dustproof plate 441D for shifting the position of the panel surface of the liquid crystal panel 441 from the back focus position of the projection lens 46 so as to make the dust adhering to the panel surface optically inconspicuous. It is fixed. The dustproof plate 441D is made of sapphire glass or quartz.

  The incident-side polarizing plate 442 transmits only polarized light in a certain direction out of each color light separated by the color separation optical system 42 and absorbs other light beams, and is used as an optical conversion film on a substrate such as sapphire glass. The polarizing film is affixed. Further, the polarizing film may be attached to the field lens 418 without using the substrate.

The optical conversion plate 443 includes a first optical conversion plate 443A and a second optical conversion plate 443B (see FIG. 4).
The first optical conversion plate 443A is configured in substantially the same manner as the incident-side polarizing plate 442, and transmits only polarized light in a predetermined direction out of the light beams emitted from the liquid crystal panel 441 (441R, 441G, 441B), and the other light beams. It absorbs. The polarization axis of the polarized light to be transmitted is set to be orthogonal to the polarization axis of the polarized light to be transmitted by the incident side polarizing plate 442. The first optical conversion plate 443A is affixed to the light beam incident end surface of the cross dichroic prism 444, for example, a transparent substrate 443A1 made of quartz, and a polarization as an optical conversion film that is affixed to the light beam incident end surface of the transparent substrate 443A1. A film 443A2.
In the present embodiment, the transparent substrate 443A1 is made of quartz, but is not limited thereto, and may be made of, for example, sapphire glass or quartz.
The second optical conversion plate 443B transmits only polarized light in a predetermined direction among the light beams emitted from the liquid crystal panel 441, absorbs other light beams, and expands the viewing angle of the light beams emitted from the liquid crystal panel 441. To do. The second optical conversion plate 443B includes a transparent substrate 443B1, a polarizing film 443B2 attached to the light emission end face of the transparent substrate 443B1, and a viewing angle compensation film 443B3 attached to the light incident end face of the transparent substrate 443B1. .

The cross dichroic prism 444 combines color modulated images emitted from the three liquid crystal panels 441R, 441G, and 441B to form a color image. In the cross dichroic prism 444, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in an approximately X shape along the interface of four right-angle prisms. Three color lights are synthesized by the dielectric multilayer film. Then, the color image synthesized by the prism 444 is emitted from the projection lens 46 and enlarged and projected on the screen.
The optical system as described above is accommodated in an optical component housing 3 having a substantially plane L shape as shown in FIG. The optical component housing 3 includes a container-shaped component storage member 31 that stores an optical component that constitutes an optical system, and a plate-shaped lid member 32 that closes an opening of the component storage member 31. Further, the optical component housing 3 is accommodated in an outer case 2 including an upper case 21 and a lower case 22.

[1-2. Configuration of optical device body]
Next, the structure of the optical device body 5 will be described with reference to FIGS.
As described above, the liquid crystal panel 441, the optical conversion plate 443, and the cross dichroic prism 444 are configured as an optical device body 5 that is unitized as a unit.
FIG. 3 is a perspective view showing the optical device body 5, and FIG. 4 is an exploded perspective view showing the optical device body 5. FIG. 5 is a cross-sectional view of the optical device body 5. Further, FIGS. 6 to 11 are perspective views showing the optical device body 5 in each step of the assembly process of the optical device body 5.
In addition to the liquid crystal panel 441, the optical conversion plate 443 and the cross dichroic prism 444, the optical device main body 5 includes a holding frame 51, a pedestal 52, a prism fixing plate 53, a panel fixing plate 54, a heat conducting plate 55, a pin spacer. 56, a heat conduction support 57 is provided.

The holding frame 51 is for accommodating and holding the liquid crystal panel 441. As shown in FIGS. 4 and 5, the holding frame 51 is engaged with the concave frame 51A for accommodating the liquid crystal panel 441 and the concave frame 51A. And a support plate 51B for pressing and fixing the liquid crystal panel 441 accommodated in the concave frame 51A to the concave frame 51A.
In the concave frame 51A and the support plate 51B, an opening 51C is formed at a position corresponding to the panel surface of the liquid crystal panel 441. The liquid crystal panel 441 is exposed through this opening, and this portion becomes an image forming area.
The concave frame 51A has a structure in which the central portion of the light exit end face is recessed toward the light entrance end face, and the liquid crystal panel 441 is accommodated in this part. The concave frame 51A has a substantially rectangular shape when viewed from the light beam incident direction, and four corners thereof are cut off. Thereby, interference with the pin spacer 56 is prevented.
Furthermore, a plurality of heat radiation fins 51A1 extending from the upper end portion toward the opening are formed on the upper portion of the light beam incident end surface of the concave frame 51A. Further, the lower part 51A2 of the light beam incident end face of the concave frame 51A is inclined toward the support plate 51B, and a notch is formed at the tip part (see FIGS. 5 and 11).
Further, an engaging groove (not shown) for engaging with the support plate 51B is formed on the inner side surface of the recessed portion of the concave frame 51A.
The concave frame 51A as described above is preferably made of a material having a high thermal conductivity such as an aluminum alloy or a magnesium alloy. For example, ADC12, AZ91D, etc. can be illustrated.
By configuring the concave frame 51A with such a material having high thermal conductivity, heat from the liquid crystal panel 441 can be efficiently transmitted.

The support plate 51B has a substantially rectangular shape when viewed from the light beam incident side, and has holes 51B1 formed at four corners. The hole 51B1 is for inserting the pin spacer 56.
In addition, on the left and right edges of the support plate 51B, engagement portions 51B2 projecting toward the light beam incident side are formed. The engaging portion 51B2 is inserted inside the recessed portion of the recessed frame 51A, and the engaging protrusion of the engaging portion 51B2 engages with the engaging groove of the recessed frame 51A. By engaging the engaging portion 51B2 and the engaging groove, the concave frame 51A and the support plate 51B are fixed.
The thickness dimension of the support plate 51B is, for example, about 0.5 mm to 0.6 mm.
The material constituting the support plate 51B is an iron-nickel alloy, and examples thereof include 36Ni—Fe and 42Ni—Fe.

By using an iron-nickel alloy for the support plate 51B, the difference between the linear expansion coefficient of the support plate 51B and the linear expansion coefficient of the dustproof plate 441D of the liquid crystal panel 441 can be reduced. When the support plate 51B is made of a magnesium alloy (AZ91D) as in the prior art, the linear expansion coefficient is 27.4 × 10 ⁻⁶ / K, and the linear expansion coefficient of the quartz dustproof plate 441D is 0.48. There is a large difference of × 10 ⁻⁶ / K.
On the other hand, as in the present embodiment, by configuring the support plate 51B with an iron nickel alloy (for example, 36Ni—Fe), the linear expansion coefficient becomes 4.3 × 10 ⁻⁶ / K, which is the same as that of the dustproof plate 441D. The difference becomes smaller.
Thereby, the difference between the expansion / contraction amount of the support plate 51B and the expansion / contraction amount of the dustproof plate 441D of the liquid crystal panel 441 is reduced, and distortion due to the difference in linear expansion coefficient is less likely to occur. Therefore, it is possible to prevent the occurrence of displacement due to the distortion of the liquid crystal panel 441, and it is possible to prevent the occurrence of pixel displacement in the projected image.
When the support plate 51B is made of an iron-nickel alloy, the thermal conductivity is relatively low at 12.6 (W / (m · K)), but the thickness of the support plate 51B is 0.5 mm to 0 mm. .About.6 mm, a predetermined thickness is ensured and the cross-sectional area is increased, so that the thermal resistance can be lowered and the predetermined heat conduction can be ensured. Therefore, even when the heat generated in the liquid crystal panel 441 is transmitted to the support plate 51B, this heat can be transmitted to the concave frame 51A and radiated to the heat conduction support 57 described later.

As shown in FIGS. 5 and 9, the prism fixing plate 53 is disposed on the lower end surface of the cross dichroic prism 444, and fits into a frame portion to be described later of the heat conduction support 57. A step portion 53 </ b> A is formed on the lower peripheral edge of the prism fixing plate 53, and this step portion 53 </ b> A contacts the step portion of the frame portion of the heat conduction support 57.
In addition, on the upper side (cross dichroic prism 444) of the prism fixing plate 53, a protruding portion 53B protruding upward is formed. The protruding portion 53 </ b> B protrudes above the frame portion of the heat conduction support body 57 and comes into contact with the cross dichroic prism 444.
Furthermore, a screw hole 53 </ b> C for screwing a screw for fixing the prism fixing plate 53 to the component storage member 31 is formed at the substantially lower center of the prism fixing plate 53. Further, a positioning projection 53D that projects downward is formed around the screw hole 53C.
The prism fixing plate 53 is made of a heat conductive material such as a magnesium alloy (for example, AZ91D), a polycarbonate mixed with a carbon filler such as a carbon nanotube, a resin such as polyphenylene sulfide (for example, PC-GF40), or the like. It is configured.

The panel fixing plate 54 is a fixing plate that fixes the holding frame 51 containing the liquid crystal panel 441 to the light beam incident end surface of the cross dichroic prism 444, and of the end surfaces orthogonal to the light beam incident end surface and the light beam emission end surface of the cross dichroic prism 444. The upper panel fixing plate 54A attached to one end surface, ie, the upper end surface, and the lower panel fixing plate 54B attached to the other end surface, ie, the lower end surface (see FIGS. 5, 6, and 9).
In this way, by attaching the upper panel fixing plate 54A and the lower panel fixing plate 54B to the end surfaces orthogonal to the light beam incident end surface and the light beam output end surface of the cross dichroic prism 444, the thickness dimension of the optical device 44 in the light beam transmission direction can be reduced. Can be thinned.

The upper panel fixing plate 54A includes a planar rectangular plate-like portion 54A1 having substantially the same size as the upper end surface of the cross dichroic prism 444, and a plurality of protruding portions 54A2 protruding outward from the four corners of the plate-like portion 54A1. Is provided.
The protrusions 54A2 are respectively provided at the end portions of the three sides of the plate-like part 54A1, and the protrusions in the protrusion direction are bent upward. That is, the protrusion 54A2 has a substantially L-shaped cross section.
A pin spacer 56 inserted into the hole 51B1 of the support plate 51B of the holding frame 51 is fixed to the surface on the light beam incident side at the front end of the protrusion 54A2. As a result, the holding frame 51 is fixed to the upper panel fixing plate 54A, and the liquid crystal panel 441 is attached to the light beam incident end face of the cross dichroic prism 444.
Since the liquid crystal panel 441 is not attached to the light beam exit end face of the cross dichroic prism 444, the protrusion 54A2 is provided on the side of the plate-like portion 54A1 that is located on the light exit end face side of the cross dichroic prism 444. Absent.

The lower panel fixing plate 54B includes a planar rectangular plate-like portion 54B1 having substantially the same size as the lower end surface of the cross dichroic prism 444, and a plurality of protrusions 54B2 provided at the four corners of the plate-like portion 54B1.
A rectangular opening 54B3 into which the above-described prism fixing plate 53 is inserted is formed at substantially the center of the plate-like portion 54B1.
The protrusion 54B2 has a substantially U-shaped side surface, and extends downward and has its tip folded back upward. The protrusions 54B2 are provided at the ends of the three sides of the plate-like part 54B1, and the pin spacer 56 is fixed to the surface on the light beam incident side at the tip of the protrusion 54B2. As a result, the holding frame 51 is fixed to the lower panel fixing plate 54B, and the liquid crystal panel 441 is attached to the light beam incident end face of the cross dichroic prism 444.
Since the liquid crystal panel 441 is not attached to the light beam exit end face of the cross dichroic prism 444, the protruding portion 54B2 is provided on the side of the plate-like portion 54B1 located on the light exit end face side of the cross dichroic prism 444. Absent.
In addition, since the lower end of a protrusion 55B of a heat conduction plate 55 described later is inserted into the inside of the tip of the protrusion 54B2, the protrusion 64B2 connects the heat conduction plate 55 to the light flux incident end surface of the cross dichroic prism 444. It also plays a role in pushing against.

The upper panel fixing plate 54A and the lower panel fixing plate 54B as described above are made of the same material as the support plate 51B of the holding frame 51, that is, an iron nickel alloy. Here, examples of the iron-nickel alloy include 36Ni—Fe and 42Ni—Fe.
As described above, the panel fixing plate 54 is made of the same iron-nickel alloy as the support plate 51B of the holding frame 51, so that the linear expansion coefficient between the panel fixing plate 54 and the support plate 51B fixed to the panel fixing plate 54 is obtained. Therefore, the panel fixing plate 54 and the support plate 51B exhibit the same dimensional change (expansion and contraction) with respect to heat. Therefore, it is possible to prevent the occurrence of distortion due to the difference between the expansion and contraction amounts between the panel fixing plate 54 and the support plate 51B, and to prevent the occurrence of positional deviation of the liquid crystal panel 441 with respect to the cross dichroic prism 444 that causes pixel deviation. Can do. As a result, it is possible to more reliably prevent the occurrence of pixel shift in the projected image and improve the accuracy of the image quality. And since pixel shift can be prevented in this way, it becomes possible to cope with higher definition of the projected image.

As shown in FIGS. 3 to 5, the pedestal 52 is installed on the plate-like portion 54 </ b> A <b> 1 of the upper panel fixing plate 54 </ b> A and has a substantially rectangular parallelepiped shape. The outer peripheral shape of the pedestal 52 is substantially the same size as the cross dichroic prism 444. The pedestal 52 is made of a thermally conductive material, and examples thereof include a magnesium alloy (for example, AZ91D). As shown in FIG. 2, the pedestal 52 protrudes upward from the lid-like member 32 of the optical component housing 3, and a thermally conductive elastic member 521 mounted on the pedestal 52, for example, heat conduction Rubber (low resilience silicon or the like) is in contact with the upper surface of the upper case 21 of the outer case 2 that houses the optical component casing 3.
On the lower portions of the three side surfaces of the pedestal 52, planar rectangular plate-like protrusions 522 that protrude outward are formed. The plate-like protrusion 522 is attached with a heat-conductive plate-like elastic member 58, for example, a heat-conductive rubber such as a non-resilience silicon rubber. In addition, the plate-like protrusion 522 is not formed on the side surface located on the light emission side, and the plate-like elastic member 58 is not attached.

As shown in FIGS. 4 and 5, the heat conducting plate 55 is formed into a substantially rectangular shape by subjecting a flat plate to sheet metal processing. The heat conducting plate 55 is attached to the light beam incident end face of the cross dichroic prism 444 and supports and fixes the second optical conversion plate 443B.
The heat conducting plate 55 includes a plate-like member 55A and protruding portions 55B that protrude from the left and right sides of the plate-like member 55A toward the light beam incident side.
The heat conductive plate 55 only needs to be made of a material having high heat conductivity. For example, the heat conductive plate 55 may be made of an electrogalvanized steel plate, a SPCC steel plate, or the like. You may comprise an alloy, Mg alloy, Al alloy, etc.

In the plate-like member 55A, an opening 55A1 is formed in a substantially central portion by cutting or the like. The dimension of the opening 55A1 is substantially the same as or slightly larger than the outer dimension of the substrate 443A1 of the first optical conversion plate 443A, and the substrate 443A1 can be fitted into the opening 55A1.
A gap between the plate member 55A and the first optical conversion plate 443A is filled with a heat conductive transparent adhesive, for example, siloxane-free silicon RTV (room temperature vulcanization type silicon), and the plate member 55A and The first optical conversion plate 443A is bonded and fixed.
Further, in the plate-like member 55A, the upper end portion is a pasting portion 55A2 protruding upward from the light beam incident end face of the cross dichroic prism 444. The sticking portion 55A2 is formed with a notch 55A3 for absorbing a difference in hot behavior toward the opening 55A1 at a substantially central portion of the upper and lower edges. Furthermore, the light flux exit end face of the sticking portion 55A2 contacts the plate-like elastic member 58 attached to the side surface of the pedestal 52. Thereby, the first optical conversion plate 443A and the pedestal 52 are connected so as to be able to conduct heat, and heat from the first optical conversion plate 443A is applied to the pasting portion 55A2, the plate-like elastic member 58, and the pedestal 52 of the heat conduction plate 55. Is transmitted to. Thus, by forming the pasting portion 55A2 protruding above the light beam incident end face of the cross dichroic prism 444 on the heat conducting plate 55, the size of the transparent substrate 443A1 of the first optical conversion plate 443A is increased, and the base The heat generated by the first optical conversion plate 443A can be radiated without being connected to the 52 plate-like elastic member 58. Thereby, an increase in cost of the optical device 44 due to an increase in the size of the transparent substrate 443A1 of the first optical conversion plate 443A can be avoided.
In addition, since the transparent substrate 443A1 of the first optical conversion plate 443A is attached to the light incident end face of the cross dichroic prism 444, a part of the heat generated by the first optical conversion plate 443A is crossed from the transparent substrate 443A1. It is transmitted to the dichroic prism 444 and further transmitted to the pedestal 52 via the upper panel fixing plate 54A. Thus, heat dissipation efficiency can be improved by providing two heat dissipation paths for radiating the heat of the first optical conversion plate 443A.
Further, by connecting the sticking portion 55A2 of the heat conducting plate 55 to the pedestal 52 via the plate-like elastic member 58, even if the expansion and contraction rates of the heat conducting plate 55 and the pedestal 52 are different, This can be absorbed by the plate-like elastic member 58. Thereby, the connection state of the heat conductive board 55 and the base 52 can be hold | maintained.

The protruding portion 55B is located on the left and right edges of the opening 55A1 in the plate-like member 55A, protrudes toward the light incident side, and has a tip portion bent toward the opening 55A1 so as to have an L shape in cross section.
The protrusion dimension of the protrusion 55B is such that the first optical conversion plate 443A protrudes from the opening 55A1 of the heat conduction plate 55 in a state where the first optical conversion plate 443A and the heat conduction plate 55 are installed with respect to the cross dichroic prism 444. It is formed larger than the dimension to be. In the protruding portion 55B, the second optical conversion plate 443B is fixed to a light beam incident end surface having an L shape in a sectional view through a heat conductive double-sided tape. As this heat conductive double-sided tape, for example, one having a low thermal resistance based on polyimide is preferable.
Thereby, the heat generated in the second optical conversion plate 443B is transmitted to the protruding portion 55B of the heat conducting plate 55, and this heat is further applied to the pasting portion 55A2, the plate-like elastic member 58, and the pedestal 52 of the heat conducting plate 55. Is communicated. Thereby, the heat generated in the second optical conversion plate 443B can be radiated.
Note that the lower end portion of the protrusion 55B has a light beam incident side surface cut off, and is inserted into the protrusion 54B2 of the lower panel fixing plate 54B.

As shown in FIGS. 4 and 5, the pin spacer 56 is for fixing the holding frame 51 containing the liquid crystal panel 441 to the panel fixing plate 54, and has a substantially U-shaped shape on a plane. In the present embodiment, two pin spacers 56 are used for each holding frame 51.
The pin spacer 56 includes two pin portions 561 and a connecting portion 562 that connects the pin portions 561, and these are integrally formed.
By adopting a structure in which the pin portion 561 of the pin spacer 56 is connected by the connecting portion 562, inclination due to its own weight when the pin spacer 56 is attached to the panel fixing plate 54 can be prevented.
The pin portion 561 is inserted into the hole 51B1 of the support plate 51B of the holding frame 51, and is fixed to the panel fixing plate 54, and is formed in a substantially cylindrical shape.
The connecting portion 562 is connected to the end portion of the pin portion 561 located on the light beam incident side, is orthogonal to the pin portion 561, extends outwardly, and further has its extension direction tip bent at 90 °, whereby the liquid crystal panel 441 is connected. The tip of the extending direction is bent at 90 ° and extends in the vertical direction along the light incident end surface of the holding frame 51.
Since cooling air is blown onto the optical device body 5 from the lower side toward the upper side, the connecting portion 562 of the pin spacer 56 extends along the flow of the cooling air. Thereby, the flow of the cooling air is not hindered by the connecting portion 562 of the pin spacer 56.
In this embodiment, the pin spacer 56 is installed so that the connecting portion 562 extends along the up-down direction. However, the present invention is not limited thereto, and for example, the pin spacer so that the connecting portion 562 extends along the left-right direction. 56 may be installed.

The pin part 561 and the connection part 562 as described above are integrally formed, and are made of, for example, an acrylic resin.
Since the pin spacers 56 are made of acrylic resin, the elastic modulus of the pin spacers 56 is low, and the pin spacers 56 are removed when the support plate 51B of the holding frame 51 and the panel fixing plate 54 are affected by heat. The expansion and contraction of the support plate 51B and the panel fixing plate 54 are not hindered. This prevents an unnecessary force from being generated between the pin spacer 56 and the panel fixing plate 54 and between the pin spacer 56 and the holding frame 51, thereby preventing the panel fixing plate 54 and the holding frame 51 from being distorted. can do.

As shown in FIGS. 4 and 5, the heat conduction support 57 is connected to the prism fixing plate 53 and supports the entire optical device 44. The heat conduction support 57 is installed on the bottom surface of the component storage member 31.
The heat conduction support 57 includes a frame portion 571 having a substantially rectangular plane, an extension portion 572 extending outward from the four corners of the frame portion 571, and a columnar shape protruding upward from the tip of the extension portion 572. Four heat conducting parts 573 are provided.
The frame portion 571 has an opening at the center thereof, and the prism fixing plate 53 is fitted inside the opening. A step portion 571 </ b> A is formed at the inner bottom of the opening of the frame portion 571. The lower surface of the prism fixing plate 53 fitted in the frame portion 571 is exposed from the opening.
When the prism fixing plate 53 is fitted into the frame portion 571, a gap is formed between the frame portion 571 and the lower panel fixing plate 54B fixed to the lower end surface of the cross dichroic prism 444.
Further, the outer dimension of the frame portion 571 is larger than the outer dimension of the cross dichroic prism 444.

The extension portions 572 are provided at the four corners of the frame portion 571. On the upper surface of the extension portion 572, the heat conducting portion extending along the left and right edges of the holding frame 51 in a state where the optical device 44 is assembled. 573 is provided.
Between the heat conducting portion 573 and the side surface of the concave frame 51A of the holding frame 51, there is a heat conductive member 59 (see FIG. 3) that contacts both of them, for example, heat conductive rubber (low molecular siloxane free silicon or the like). It arrange | positions and becomes the structure by which the heat | fever of the liquid crystal panel 441 from the holding frame 51 is conducted to the heat-conduction part 573.
In this embodiment, the prism fixing plate 53 and the heat conduction support 57 are separated from each other. However, the present invention is not limited to this, and the prism fixing plate and the heat conduction support may be integrally formed.
The frame part 571, the extension part 572, and the heat conduction part 573 of such a heat conduction support 57 are integrally formed, for example, made of a magnesium alloy (such as AZ91D).

The optical device main body 5 as described above is assembled as follows.
First, as shown in FIG. 6, the upper panel fixing plate 54 </ b> A is attached to the upper end surface of the cross dichroic prism 444, and the first optical conversion plate 443 </ b> A is attached to the light flux incident end surface of the cross dichroic prism 444.
A prism fixing plate 53 is attached to the lower end surface of the cross dichroic prism 444.
Next, as shown in FIG. 7, a pedestal 52 to which a plate-like elastic member 58 is attached is installed on the plate-like portion 54A1 of the upper panel fixing plate 54A.
Further, as shown in FIG. 8, a heat conducting plate 55 is attached to the light beam incident end face of the cross dichroic prism 444. At this time, the first optical conversion plate 443A and the heat conductive plate 55 are fixed by a heat conductive adhesive.
Next, as shown in FIG. 9, the lower panel fixing plate 54 </ b> B is fixed to the lower end surface of the cross dichroic prism 444. Thereafter, as shown in FIG. 10, the second optical conversion plate 443B is fixed to the surface of the protrusion 55B of the heat conducting plate 55 located on the light beam incident side.
Further, as shown in FIG. 11, the holding frame 51 in which the liquid crystal panel 441 is accommodated is attached to the panel fixing plate 54. Specifically, the pin portion 561 of the pin spacer 56 is inserted into the hole 51B1 of the support plate 51B of the holding frame 51, and the tip of the pin portion 561 is fixed to the upper panel fixing plate 54A and the lower panel fixing plate 54B.
Then, the prism fixing plate 53 attached to the lower end surface of the cross dichroic prism 444 is inserted into the frame portion 571 of the heat conduction support 57.
Furthermore, between the heat conducting portion 573 of the heat conducting support 57 and the side surface of the holding frame 51, a heat conducting member 59 that contacts both is installed (see FIG. 3). Further, the elastic member 521 is pasted on the pedestal 52.
Thus, the assembly of the optical device body 5 is completed.

[1-3. Heat dissipation structure of optical device body]
Heat is generated in the liquid crystal panel 441, the optical conversion plate 443, and the cross dichroic prism 444 of the optical device body 5 by irradiation of the light beam from the light source device 411. Although not shown, cooling air is blown onto the optical device main body 5 from below to above, and these optical components are cooled by cooling with cooling air and heat radiation by heat transfer.
The heat dissipation path of the optical device body 5 will be described below.
An upper panel fixing plate 54A is installed on the cross dichroic prism 444, and a pedestal 52 to which a heat conductive elastic member 521 is attached is installed on the upper panel fixing plate 54A. Accordingly, part of the heat generated by the cross dichroic prism 444 is transmitted to the heat conductive elastic member 521 via the upper panel fixing plate 54A and the pedestal 52. Since the heat conductive elastic member 521 is in contact with the upper surface of the upper case 21 of the outer case 2, a part of the heat generated by the cross dichroic prism 444 is transmitted to the outer case 2 and radiated.
On the other hand, a prism fixing plate 53 is attached to the lower end surface of the cross dichroic prism 444, and the prism fixing plate 53 is fixed to the component storage member 31. Accordingly, the other part of the heat generated by the cross dichroic prism 444 is transmitted to the prism fixing plate 53 and is transmitted from the prism fixing plate 53 to the component housing member 31 to be radiated.

Next, the heat dissipation path of the liquid crystal panel 441 will be described.
Since the liquid crystal panel 441 is accommodated in the holding frame 51, the heat generated in the liquid crystal panel 441 is transmitted to the holding frame 51. Between the side surface of the recessed frame 51 </ b> A of the holding frame 51 and the heat conducting portion 573 of the heat conducting support 57, a heat conductive member 59 that is in contact with both is installed, so that it is transmitted to the holding frame 51. Heat is transferred to the heat conduction support 57 via the heat conductive member 59. Since the heat conduction support 57 is installed in the component storage member 31, the heat transmitted to the heat conduction support 57 is transmitted to the component storage member 31 and radiated.
Since a gap is formed between the frame portion 571 of the heat conduction support 57 and the lower panel fixing plate 54B, the heat transmitted to the heat conduction support 57 is transmitted to the lower panel fixing plate 54B. Thus, heat is not transmitted from the lower panel fixing plate 54B to the cross dichroic prism 444.

A heat dissipation path of the optical conversion plate 443 will be described.
Among the optical conversion plates 443, the first optical conversion plate 443A is connected to the heat conductive plate 55 by a heat conductive transparent adhesive, and therefore the heat generated in the first optical conversion plate 443A is the heat conductive plate. 55.
The heat conduction plate 55 is in contact with the plate-like elastic member 58 having the sticking portion 55A2 attached to the side surface of the pedestal 52, so that the heat transmitted to the heat conduction plate 55 is applied to the sticking portion 55A2 and the plate-like member. The heat is transmitted to the elastic member 58 and the pedestal 52, and is radiated to the exterior case 2 through the heat conductive elastic member 521.
In addition, since the transparent substrate 443A1 of the first optical conversion plate 443A is fixed to the light beam incident end face of the cross dichroic prism 444, the heat generated by the first optical conversion plate 443A is transmitted through the transparent substrate 443A1 to the cross dichroic prism 444. Is transmitted to. Further, this heat is transmitted to the exterior case 2 through the base 52 and the heat conductive elastic member 521 to be radiated.
On the other hand, among the optical conversion plates 443, the second optical conversion plate 443B is attached to the protruding portion 55B of the heat conduction plate 55, so that the heat generated by the second optical conversion plate 443B is transmitted to the heat conduction plate 55. Is done. As described above, the heat conduction plate 55 has the sticking portion 55A2 in contact with the plate-like elastic member 58 attached to the side surface of the pedestal 52, so that the heat transmitted to the heat conduction plate 55 is applied to the heat conduction plate 55. The heat is transmitted to the portion 55A2, the plate-like elastic member 58, and the pedestal 52, and is radiated to the exterior case 2 through the heat conductive elastic member 521.

  As described above, in the present embodiment, the heat generated in the liquid crystal panel 441 is transmitted to the component housing member 31 through the heat conduction support body 57 to dissipate heat, and the heat generated in the optical conversion plate 443 is pedestal. The heat is radiated from 52 to the outer case 2. In this way, by using different paths for the heat generated in the liquid crystal panel 441 and the optical conversion plate 443, heat can be dispersed and efficiently radiated.

[2. Second embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
FIG. 12 shows the liquid crystal panel 441, the second optical conversion plate 443B, the holding frame 51, the heat conduction plate 55, the pin spacer 56, the heat conduction support 57, and the lower panel fixing plate 54B from the optical device body 6 of the present embodiment. FIG. 13 is a perspective view showing a removed state, and FIG. 13 is a cross-sectional view of the optical device body 6 of the present embodiment.
The optical device main body 5 of the above embodiment and the optical device main body 6 of the present embodiment are different in the shape of the upper panel fixing plate attached to the upper end surface of the cross dichroic prism 444 and the shape of the pedestal. The optical device body 6 is the same as the optical device body 5 in other points.
The panel fixing plate 64 of this embodiment includes an upper panel fixing plate 64A and a lower panel fixing plate 54B similar to the above embodiment.
The upper panel fixing plate 64A includes a planar rectangular frame-shaped portion 64A1 having an opening 64A2 formed at the center, and protruding portions 54A2 that protrude from the four corners of the frame-shaped portion 64A1 and have the same structure as that of the above embodiment.
The outer shape of the frame portion 64A1 is substantially the same size as the upper end surface of the cross dichroic prism 444, and the rectangular opening 64A2 formed in the center has a smaller outer shape than the upper end surface of the cross dichroic prism 444. ing. The upper panel fixing plate 64A is made of the same material as the upper panel fixing plate 54A of the above embodiment.

A pedestal 62 is installed on the upper surface of the upper panel fixing plate 64A.
The pedestal 62 has a substantially rectangular parallelepiped shape like the pedestal 52 of the above-described embodiment, and plate-like protrusions 522 are formed on the lower portions of the three side surfaces, respectively. The plate-like protrusion 522 is attached with a heat-conductive plate-like elastic member 58 as in the above embodiment.
A lower protrusion 623 that protrudes downward (to the side of the cross dichroic prism 444) is formed substantially at the center of the bottom surface of the pedestal 62. The lower protrusion 623 has a substantially rectangular shape in a plan view, and has an outer dimension that can be fitted into the opening 64A2 of the frame-like portion 64A1 of the upper panel fixing plate 64A. The projecting dimension of the lower projecting part 623 is slightly larger than the thickness dimension of the frame-shaped part 64A1. Accordingly, a gap S is formed between the lower surface of the pedestal 62 and the portion around the lower protrusion 623 and the frame-shaped portion 64A1.
In addition, such a base 62 is comprised with the same material as the base 52 of the said embodiment.

In the present embodiment as described above, the opening 64A2 is formed in the frame-like portion 64A1 of the upper panel fixing plate 64A, and the lower protrusion 623 of the pedestal 62 is fitted into the opening 64A2, and the lower protrusion 623. Since the projecting dimension is slightly larger than the thickness dimension of the frame-shaped portion 64A1, a gap S is formed between the frame-shaped portion 64A1 of the upper panel fixing plate 64A and the lower surface of the pedestal 62. Has been. Therefore, the heat transmitted from the optical conversion plate 443 to the pedestal 62 via the heat conduction plate 55 is not transmitted from the upper panel fixing plate 64A to the cross dichroic prism 444. Therefore, heat does not accumulate in the cross dichroic prism 444, and heat can be efficiently radiated from the pedestal 62.
Further, since the opening 64A2 is formed in the frame-like portion 64A1 of the upper panel fixing plate 64A, the contact area with the cross dichroic prism 444 can be reduced. Therefore, even if heat from the pedestal 62 is transmitted to the upper panel fixing plate 64A, it is possible to prevent heat from being transmitted to the cross dichroic prism 444.

[3. Third embodiment]
Next, a third embodiment of the present invention will be described with reference to FIGS.
14 and 15 are perspective views of the optical device main body 7 of the present embodiment, and FIG. 16 is a cross-sectional view of the optical device main body 7. FIG. 17 is a perspective view showing the panel fixing plate 74.
The optical device body 7 of the present embodiment is different from the optical device body 5 of the first embodiment in the shape of the panel fixing plate. Further, the optical device body 7 of the present embodiment does not include the pin spacer 56. In other respects, the optical device body 7 is the same as the optical device body 5 of the first embodiment.
The panel fixing plate 74 of this embodiment includes an upper panel fixing plate 74A that is fixed to the upper end surface of the cross dichroic prism 444 and a lower panel fixing plate 74B that is fixed to the lower end surface of the cross dichroic prism 444.
The panel fixing plate 74 is made of the same material, although the shape is different from the panel fixing plate 54 of the first embodiment.

As shown in FIG. 17, the upper panel fixing plate 74A includes a plate-like portion 54A1 and a plurality of protrusions 74A2 that protrude outward from the four corners of the plate-like portion 54A1.
The protrusions 74A2 are provided at the end portions on the three sides of the plate-like portion 54A1, similarly to the protrusions 54A2 of the embodiment.
The projecting portion 74A2 is provided from the plate-like portion 54A1 to the first extension portion 74A4 extending outward on the same plane as the plate-like portion 54A1, and substantially orthogonal to the first extension portion 74A4. A second extending portion 74A5 extending upward, and a third extending portion 74A6 provided substantially orthogonal to the second extending portion 74A5 and extending substantially parallel to the first extending portion 74A4 are provided.
The width dimension of the extending direction distal end portion 74A61 of the third extending portion 74A6 is narrow, and the distal end portion 74A61 is inserted into the hole 51B1 formed on the upper side of the holes 51B1 of the support plate 51B of the holding frame 51. As a result, the holding frame 51 is fixed to the upper panel fixing plate 74 </ b> A, and the upper panel fixing plate 74 </ b> A holds the holding frame 51.

The lower panel fixing plate 74B includes a planar rectangular plate-like portion 54B1 having substantially the same size as the lower end surface of the cross dichroic prism 444, and a plurality of protrusions 74B2 provided at the four corners of the plate-like portion 54B1.
The protrusions 74B2 are respectively provided at the end portions on the three sides of the plate-like part 54B1, similarly to the protrusions 54B2 of the above-described embodiment.
The protruding portion 74B2 extends outward from the plate-like portion 54B1 on the same plane as the plate-like portion 54B1, and the width dimension of the extending direction front end portion 74B21 is the same as that of the protruding portion 74A2 of the upper panel fixing plate 74A. It is thin like the three extending portions 74A6. The tip 74B21 is inserted into a hole 51B1 formed on the lower side of the hole 51B1 of the support plate 51B of the holding frame 51. As a result, the holding frame 51 is fixed to the lower panel fixing plate 74B, and the lower panel fixing plate 74B holds the holding frame 51.

  In the present embodiment as described above, the tip 74A61 of the protrusion 74A2 of the upper panel fixing plate 74A and the tip 74B21 of the protrusion 74B2 of the lower panel fixing plate 74B are inserted into the holes 51B1 of the support plate 51B of the holding frame 51. Thus, since the holding frame 51 is fixed to the upper panel fixing plate 74A and the lower panel fixing plate 74B, a pin spacer for fixing the holding frame 51 to the panel fixing plate becomes unnecessary. Thereby, the number of members can be reduced.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in each of the above-described embodiments, the hole 51B1 is formed in the support plate 51B of the holding frame 51, and the support plate 51B and the panel fixing plates 54, 64, 74 are connected, and these are made of an iron nickel alloy. For example, when the concave frame body and the panel fixing plate are connected to each other by forming holes in the four corners without cutting the four corners of the concave frame body of the holding frame, And may be made of an iron-nickel alloy.
Moreover, in each said embodiment, although the heat | fever which generate | occur | produced in the optical conversion board 443 was transmitted to the base 52 via the heat conductive board 55, it is not restricted to this, For example, the lower end part of the plate-shaped member of a heat conductive board May be brought into contact with the heat conduction support 57 to transfer the heat generated by the optical conversion plate 443 to the heat conduction support 57 via the heat conduction plate. In this case, the pedestal 52 is not necessary, and the number of members can be reduced.
Further, in each of the above embodiments, the heat generated in the liquid crystal panel 441 is transferred from the holding frame 51 to the heat conduction support member 57 via the heat conductive member 59. However, the present invention is not limited to this. The heat generated at 441 may be transmitted to the pedestal 52.

In each of the above embodiments, the panel fixing plates 54, 64, 74 for fixing the holding frame 51 containing the liquid crystal panel 441 to the cross dichroic prism 444 are the upper panel fixing plates 54A, 64A, 74A, the lower panel fixing plate 54A, 74B, which are fixed to the upper end surface and the lower end surface of the cross dichroic prism 444, respectively, but are not limited thereto. For example, a single panel fixing plate may be formed and attached to the light beam incident end face of the cross dichroic prism 444. In this case, an opening for transmitting a light beam may be formed at the center of the panel fixing plate.
In each of the above embodiments, the incident-side polarizing plate 442 is separated from the optical device main bodies 5, 6, and 7. However, the present invention is not limited to this, and for example, the incident-side polarizing plate 442 is provided at the connecting portion 562 of the pin spacer 56. It may be attached. By doing so, the incident-side polarizing plate 442 can also be integrated, so that the optical device can be handled easily.

Furthermore, in each said embodiment, although the pin spacer 56 shall be provided with the two pin parts 561 and the connection part 562 which connects this pin part 561, you may use the pin spacer without a connection part. .
In the second embodiment, a lower protrusion 623 is formed on the pedestal 62, and the lower protrusion 623 is fitted into the frame-like portion 64A1 of the upper panel fixing plate 64A, so that the pedestal 62 is installed on the cross dichroic prism 444. However, the present invention is not limited to this, and the lower protrusion 623 is not formed on the pedestal as in the first embodiment, the lower surface of the pedestal is a flat surface, and this pedestal is on the frame-like portion 64A1 of the upper panel fixing plate 64A. You may install in. In this case, the pedestal and the frame-like portion 64A1 come into contact with each other. However, since the opening is formed in the frame-like portion, the contact area between the pedestal and the frame-like portion becomes small. Therefore, the heat transmitted to the pedestal is difficult to be transmitted to the frame-shaped portion 64A1, and as a result, the heat transmitted to the pedestal flows to the cross dichroic prism 444 via the frame-shaped portion 64A1 of the upper panel fixing plate 64A. Can be prevented.
Further, in each of the above embodiments, a projector using three liquid crystal panels has been exemplified. However, in the present invention, the number of liquid crystal panels may be two, or four or more.
In the above embodiment, only the front projection type projector that performs projection from the direction of observing the screen is taken as an example. However, in the present invention, a rear type projector that projects from the opposite side to the direction of observing the screen. It can also be applied to.

  The present invention can be used not only for multimedia presentations at conferences, academic conferences, exhibitions, etc., but also for front projection projectors widely used for watching movies at home and the like, as well as for rear projectors.

1 is a schematic diagram showing an optical system of a projector according to a first embodiment of the present invention. The perspective view which shows the housing | casing for optical components in which the said optical system is accommodated, and an exterior case. The perspective view which shows an optical apparatus main body. The disassembled perspective view which shows an optical apparatus main body. Sectional drawing which shows an optical apparatus main body. The perspective view which shows the principal part of an optical apparatus main body. The perspective view which shows the principal part of an optical apparatus main body. The perspective view which shows the principal part of an optical apparatus main body. The perspective view which shows the principal part of an optical apparatus main body. The perspective view which shows the principal part of an optical apparatus main body. The perspective view which shows the principal part of an optical apparatus main body. The perspective view which shows the principal part of the optical apparatus main body concerning 2nd embodiment of this invention. Sectional drawing which shows the said optical apparatus main body. The perspective view which shows the optical apparatus main body concerning 3rd embodiment of this invention. The perspective view which shows the said optical apparatus main body. Sectional drawing which shows the said optical apparatus main body. The perspective view which shows the panel fixing plate used for the said optical apparatus main body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Projector, 51 ... Holding frame, 51A ... Concave frame, 51B ... Support plate, 51B1 ... Hole, 52 ... Base, 54, 64, 74 ... Panel fixing plate (fixing plate), 55 ... Heat conduction plate, 62 ... Pedestal, 74A2 ... projection, 74B2 ... projection, 441, 441R, 441G, 441B ... liquid crystal panel, 443 ... optical conversion plate, 443A ... first optical conversion plate, 443A1 ... transparent substrate, 443A2 ... polarizing film (optical conversion film) ) 444 ... Cross dichroic prism

Claims (7)

An optical device comprising: a light modulation device that modulates a light beam emitted from a light source according to image information; and a color synthesis optical device that combines an optical image formed by the light modulation device,
A holding frame having a concave frame that houses the light modulation device and a support plate that presses and fixes the light modulation device to the concave frame;
A fixing plate for fixing the holding frame to a light beam incident end surface of the color synthesis optical device;
Of the fixed plate and the concave frame body and support plate of the holding frame, at least one of the fixed plate and the fixed plate is made of the same material,
An optical device characterized in that the material is an iron-nickel alloy. The optical device according to claim 1.
The optical nickel device is characterized in that the iron-nickel alloy is 36Ni-Fe or 42Ni-Fe. The optical device according to claim 1 or 2,
The optical apparatus according to claim 1, wherein the fixing plate is attached to an end surface orthogonal to a light beam incident end surface and a light beam emission end surface of the color combining optical device. The optical device according to claim 3.
An optical conversion plate having an optical conversion film for converting the optical characteristics of the light beam emitted from the light modulation device and a thermally conductive transparent substrate on which the optical conversion film is attached to the light beam incident end face of the color synthesis optical device Is attached,
On the fixed plate, a thermally conductive pedestal is installed,
An optical apparatus, comprising: a heat conductive plate that connects the optical conversion plate and the pedestal so as to allow heat conduction. The optical device according to claim 4.
An optical device, wherein an opening is formed in the fixing plate so as to penetrate between a surface facing the color synthesis optical device and a surface facing the pedestal. The optical device according to any one of claims 1 to 5,
The support plate of the holding frame has a plurality of holes,
The fixing plate has a protruding portion that protrudes toward the holding frame and is inserted into a hole formed in the supporting plate of the holding frame.
The optical device, wherein the support plate and the fixed plate are made of an iron-nickel alloy. A projector that modulates a light beam emitted from a light source according to image information and projects an enlarged optical image,
A projector comprising the optical device according to claim 1.

Images