JP2005215198A - Optical modulation element holder, optical apparatus and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical modulation element holder where an optical modulation element can be efficiently cooled by cooling fluid, and to provide an optical apparatus and a projector. <P>SOLUTION: The optical modulation element holder 4402 is provided with a pair of frame members 4405 and 4406 for holding a liquid crystal panel 441, and translucency substrates 442A and 443A separately arranged on the outer surfaces of the pair of frame members 4405 and 4406. A cooling chamber is formed in the pair of frame members 4405 and 4406 by closing the openings 4405A and 4406A of the pair of frame members 4405 and 4406 with the liquid crystal panel 441 and the translucency substrates 442A and 443A. The pair of frame members 4405 and 4406 is provided with an inflow port for making the cooling fluid flow into the cooling chamber, an outflow port for making the cooling liquid flowing outside the cooling chamber and a communication port for connecting the cooling chambers so as to communicate each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a light modulation element holder, an optical device, and a projector.

Conventionally, a plurality of light modulation devices that form an optical image by modulating a light beam emitted from a light source according to image information, a color combining optical device that combines and emits a light beam modulated by each light modulation device, There is known a projector including a projection optical device that enlarges and projects a light beam synthesized by a color synthesis optical device.
Among these, as the light modulation device, for example, an active matrix drive type light modulation element in which an electro-optic material such as liquid crystal is hermetically sealed between a pair of substrates is generally employed. Specifically, a pair of substrates constituting this light modulation element is disposed on the light beam emission side, and a drive substrate on which data lines, scanning lines, switching elements, pixel electrodes and the like for applying a drive voltage to the liquid crystal are formed. And a counter substrate that is disposed on the light beam incident side and on which a common electrode, a black matrix, and the like are formed.
An incident-side polarizing plate and an emitting-side polarizing plate that transmit a light beam having a predetermined polarization axis are arranged on the light beam incident side and the light beam emission side of the light modulation element, respectively.
Here, when the light beam emitted from the light source is applied to the light modulation element, the light absorption by the liquid crystal layer, the data lines and scanning lines formed on the drive substrate, the black matrix formed on the counter substrate, etc. The temperature of the light modulation element is likely to rise due to light absorption by the light. Of the luminous flux emitted from the light source and the luminous flux transmitted through the light modulation element, the luminous flux that does not have a predetermined polarization axis is absorbed by the incident-side polarizing plate and the outgoing-side polarizing plate, and heat is applied to the polarizing plate. Likely to happen.

For this reason, a projector having such an optical element is proposed to have a cooling device using a cooling fluid in order to mitigate the temperature rise of the optical element (see, for example, Patent Document 1). .
In other words, the cooling device described in Patent Document 1 is formed of a substantially rectangular parallelepiped housing having opposite end faces opened, and a cooling fluid is hermetically sealed with a cooling fluid inside by closing the openings with glass plates. Is formed. In the cooling chamber, the light modulation element, the incident-side polarizing plate, and the emission-side polarizing plate described above are spaced apart at a predetermined interval and are immersed in the cooling fluid. With such a configuration, heat generated in the light modulation element, the incident-side polarizing plate, and the emission-side polarizing plate by the light beam emitted from the light source is directly radiated to the cooling fluid.

JP-A-1-302386

However, in the cooling device described in Patent Document 1, since the cooling fluid is hermetically sealed in the cooling chamber, the cooling fluid is easily heated by the generated light modulation element and the polarizing plate, and the heated cooling fluid stays in the cooling chamber. Resulting in.
Therefore, there is a problem that the temperature difference between the light modulation element and the cooling fluid becomes small, and it is difficult to efficiently cool the light modulation element.

An object of the present invention is to provide a light modulation element holder, an optical device, and a projector that can efficiently cool a light modulation element with a cooling fluid.

  The light modulation element holding body of the present invention holds a light modulation element that forms an optical image by modulating a light beam emitted from a light source according to image information, and a cooling chamber in which a cooling fluid is enclosed is formed. A pair of frames for holding the light modulation element, each having an opening formed in accordance with an image forming region of the light modulation element, wherein the light modulation element holding body cools the light modulation element with a cooling fluid in the cooling chamber. Each of the pair of frame-shaped members and a light-transmitting substrate disposed on the opposite side of the opposite surface of the pair of frame-shaped members, and the cooling chamber is formed in the opening of the pair of frame-shaped members. The opposing surface side and the surface side opposite to the opposing surface are respectively closed by the light modulation element and the translucent substrate, respectively, and are respectively formed inside both the pair of frame members, A pair of frame-shaped parts Are formed with an inflow port for allowing the cooling fluid to flow into the cooling chamber, an outflow port for allowing the cooling fluid in the cooling chamber to flow out to the outside, and a communication port for connecting the cooling chambers in communication. It is characterized by that.

Here, for example, the following configuration can be exemplified as the inflow port and the outflow port formed in the pair of frame-shaped members.
For example, the structure which forms an inflow port in any one frame-shaped member among a pair of frame-shaped members, and forms an outflow port in the other frame-shaped member can be illustrated.
For example, the structure which forms both an inflow port and an outflow port in any one frame-shaped member among a pair of frame-shaped members can be illustrated.
The number of communication ports formed in the pair of frame-shaped members is not particularly limited as long as at least one communication port is formed.

According to the present invention, the pair of frame-shaped members have the inlet and the outlet, so that, for example, if the inlet and the outlet are connected by a fluid circulation member capable of circulating the cooling fluid, the cooling fluid is convected. This makes it possible to prevent the cooling fluid warmed by the light modulation element from staying in the cooling chamber. Therefore, the cooling fluid is warmed by the light modulation element and the temperature difference between the light modulation element and the cooling fluid is not reduced, and the light modulation element can be efficiently cooled by the cooling fluid, and the object of the present invention can be achieved.
Further, since the opening is provided in accordance with the image forming area of the light modulation element, the cooling fluid filled in each cooling chamber comes into contact with the image forming area of the light modulation element. As a result, the temperature distribution in the image forming region of the light modulation element is made uniform, local overheating is avoided, and a clear optical image can be formed by the light modulation element.
Further, the pair of frame-shaped members are respectively formed with cooling chambers, and the respective cooling chambers are connected to each other through the communication ports, so that from one cooling chamber to the other cooling chamber or the other through the communication ports. The cooling fluid can be circulated from one cooling chamber to the other cooling chamber. For this reason, the light incident side and the light emitting side of the light modulation element can be cooled by the cooling fluid having substantially the same temperature, and the temperature of the light incident side and the light emission side of the light modulation element can be made uniform.
Further, since the communication ports are formed in the pair of frame-shaped members, for example, the light modulation element holding body can be made compact compared with the configuration in which the cooling chambers are connected in communication with the fluid circulation member, and the light modulation element The holding body can be reduced in size and weight.
Furthermore, by forming the communication port, it is not necessary to provide two inlets and outlets depending on each cooling chamber, and only one inlet and outlet are provided in the light modulation element holder. Configuration can be adopted. Accordingly, the number of the fluid circulation members that connect the inlet and the outlet can be reduced as compared with the configuration in which two inlets and outlets are provided for each cooling chamber. Therefore, the work of connecting the fluid circulation member to the inlet and the outlet can be easily performed, and the space efficiency around the light modulation element holder can be improved.

In the light modulation element holding body of the present invention, the inflow port and the outflow port are respectively formed at opposed positions of opposing side end portions of any one of the pair of frame-shaped members, and the communication The opening is provided on the side end portion side where the inflow port is formed, and the cooling fluid that has flowed into the inside through the inflow port, the cooling chamber in the one frame-shaped member, and the other frame-shaped member And the cooling fluid flowing through the cooling chamber in the other frame-shaped member provided on the side end portion side where the outflow port is formed and the cooling fluid in the one frame-shaped member It is preferable that it is comprised with the junction port made to flow in into a room | chamber interior.
Here, the numbers of the diversion openings and the merge openings are not particularly limited as long as they are formed at least one by one.
According to the present invention, since the inflow port and the outflow port are respectively formed at the opposed positions of the opposed side end portions of one frame-shaped member, the flow direction of the cooling fluid in each cooling chamber can be set in one direction, The cooling fluid can be circulated smoothly in the cooling chamber, and the convection speed of the cooling fluid can be increased. Therefore, the temperature difference between the light modulation element and the cooling fluid in each cooling chamber can be maintained, and the light modulation element can be further efficiently cooled by the cooling fluid.

In the light modulation element holding body of the present invention, the diversion port is connected to the inflow port so that a part of the inner surface intersects the inflow direction of the cooling fluid flowing in from the inflow port, and the inner side surface It is preferable that a protrusion is formed in a part of the cooling medium to divert the cooling fluid flowing in via the inflow port to the cooling chambers.
According to the present invention, the diversion port is connected in communication with the inflow port so that a part of the inner surface intersects the inflow direction of the cooling fluid flowing in from the inflow port, and a protrusion is formed on a part of the inner surface. Therefore, the cooling fluid that has flowed in from the inflow port can surely flow into both cooling chambers, and both the light beam incident side and the light beam emission side of the light modulation element can be reliably cooled with the cooling fluid.
In addition, for example, when the amount of heat generated on the light incident side and the light exit side of the light modulation element are different, the protruding portion is formed at a predetermined position on a part of the inner surface of the diversion port, so A large amount of cooling fluid can be allowed to flow into the light modulation element, and the light beam incident side and the light beam emission side of the light modulation element can be efficiently cooled.

In the light modulation element holding body of the present invention, in the vicinity of the outlet, the cooling fluid that has flowed into the cooling chamber of the one frame-like member is circulated toward the outlet through the inlet. It is preferable that a rectification unit is formed to flow the cooling fluid flowing from the cooling chamber in the other frame-shaped member into the cooling chamber in the one frame-shaped member toward the outlet through the junction port. .
According to the present invention, since the rectification part is formed in the vicinity of the outlet, the cooling fluid that has flowed into the cooling chamber in the one frame-like member through the inlet, and the other frame-like member through the junction port Both of the cooling fluid that has flowed from the cooling chamber into the cooling chamber of one frame-shaped member can be smoothly circulated toward the outlet. Therefore, when the cooling fluid once warmed by the light modulation element in the cooling chamber in the other frame-shaped member flows into the cooling chamber in one frame-shaped member, it spreads and circulates in the cooling chamber in one frame-shaped member. The temperature difference between the light modulation element and the cooling fluid in the cooling chamber can be maintained, and the light modulation element can be more efficiently cooled by the cooling fluid.

In the light modulation element holding body of the present invention, the inflow port and the outflow port are respectively formed at one side end portion of one of the pair of frame-shaped members, and the communication port includes the communication port Cooling fluid that is disposed on the side end side facing the one side end portion and circulated from the one side end side in the cooling chamber in the one frame-shaped member to the side end side facing the one side end portion A first communication port for allowing the other frame-shaped member to flow into the cooling chamber, and a side end opposed to the one side end portion of the other frame-shaped member in the cooling chamber. It is preferable that the cooling fluid flowing from the part side to the one side end part side is constituted by a second communication port through which the cooling fluid flows into the cooling chamber of the one frame-shaped member.
According to the present invention, since the inflow port and the outflow port are respectively formed at one side end portion of one of the pair of frame-shaped members, the fluid circulation member to the inflow port and the outflow port is provided. Connection work can be concentrated in one direction, and the connection work can be more easily performed.
In addition, since the communication port is constituted by the first communication port and the second communication port, it flows into the cooling chamber of one frame-like member through the inflow port and faces this one side end portion from the one side end portion side. The cooling fluid that has flowed to the side end portion side that flows into the cooling chamber in the other frame-shaped member via the first communication port. In addition, the cooling fluid that flows into the cooling chamber in the other frame-like member and flows from the side end side facing the one-side end portion to the one side end portion side in the one frame-like member via the second communication port. It flows into the cooling chamber and flows out through the outlet. Thus, even if the inflow port and the outflow port are respectively formed at one side end portion of one frame-like member, the cooling fluid can be reliably circulated through both the cooling chambers.

In the light modulation element holding body of the present invention, the surface opposite to the facing surface of the one frame-shaped member is directed toward the one end portion of the peripheral edge of the opening toward the optical axis direction of the irradiated light beam. And the inflow port and the outflow port are formed so as to penetrate through the side wall of the recess, respectively, and the second communication port, the outflow port, and the first communication port are formed in the recess. And the inflow port in a plane, and the cooling fluid flowing from the cooling chamber in the other frame-shaped member into the cooling chamber in the one frame-shaped member is circulated to the outflow port via the second communication port. It is preferable that a partition wall is formed.
In the present invention, one frame-like member has a recess formed on the surface opposite to the facing surface, and a partition is formed in the recess. And by arrange | positioning a translucent board | substrate on the surface side opposite to the surface which opposes, the cooling chamber inside in one frame-shaped member is the area | region where an inflow port and a 1st communication port communicate with the partition mentioned above. The second communication port and the outlet communicate with each other. Accordingly, the cooling fluid that has flowed into the cooling chamber of the one frame-shaped member from the cooling chamber of the other frame-shaped member through the second communication port can be smoothly circulated toward the outlet. Therefore, when the cooling fluid warmed by the light modulation element in the cooling chamber in the other frame-shaped member flows into the cooling chamber in one frame-shaped member, it spreads and circulates in the cooling chamber in one frame-shaped member. The temperature difference between the light modulation element and the cooling fluid in the cooling chamber is not reduced, and the light modulation element can be cooled more efficiently by the cooling fluid.

In the light modulation element holding body of the present invention, the inlet is formed in one of the pair of frame members, and the cooling fluid flows into the cooling chamber in the one frame member. The communication port causes the cooling fluid in the cooling chamber in the one frame-shaped member to flow through the cooling chamber in the other frame-shaped member, and the outlet is the one of the pair of frame-shaped members. Preferably, the cooling fluid is formed in one of the other frame-shaped members, and the cooling fluid inside the cooling chamber in the other frame-shaped member is allowed to flow out.
According to the present invention, the inflow port is formed in one of the pair of frame members, and the outflow port is formed in the other frame member of the pair of frame members. By forming at least one communication port, the cooling fluid that has flowed into the cooling chamber in one frame-shaped member through the inflow port is caused to flow into the cooling chamber in the other frame-shaped member through the communication port, It can be discharged to the outside through the outflow port. Therefore, it is possible to easily circulate the cooling fluid in both the cooling chambers from the cooling chamber in one frame-shaped member to the cooling chamber in the other frame-shaped member. Further, if only at least one communication port is provided, it becomes possible to circulate a cooling fluid in each cooling chamber, and the light modulation element holder can be easily manufactured, and the light modulation element holder can be downsized. In addition, the weight can be reduced.

In the light modulation element holder of the present invention, the communication port is formed in one of the pair of frame-shaped members and has a hole communicating with the inside of the cooling chamber in the one frame-shaped member. And a cylindrical portion protruding toward the other frame-shaped member and the other frame-shaped member, communicated with the cooling chamber inside the other frame-shaped member, and allowing the cylindrical portion to be inserted. It is preferable to be comprised by the cylindrical part insertion hole.
According to the present invention, since the communication port is constituted by the cylindrical portion and the cylindrical portion insertion hole, when assembling each frame-shaped member, one of the cylindrical portion insertion holes in the other frame-shaped member The cooling chambers can be easily connected to each other by inserting the cylindrical portion of the frame-shaped member.
In addition, for example, compared to a configuration in which the tubular portion is provided in each of the one frame-shaped member and the other frame-shaped member, and the communication ports are formed by connecting the respective tubular portions, cooling through the communication ports is performed. Fluid leakage can be easily prevented with a simple configuration.

The light modulation element holding body of the present invention includes an elastic member interposed between the other frame-shaped member and the light modulation element, and the insertion hole through which the cylindrical portion can be inserted into the elastic member. Is preferably formed.
According to the present invention, the light modulation element holding body includes the elastic member, and the elastic member is formed with the insertion hole. Therefore, when the light modulation element holding body is assembled, the elastic member is each frame-shaped member. The insertion hole in the elastic member can be pressed into contact with the tubular portion and the connection portion of the tubular portion insertion hole. Therefore, the leakage of the cooling fluid flowing through the communication port can be reliably prevented with a simple configuration.

In the light modulation element holding body of the present invention, the pair of frame-like members each have a recess recessed toward the optical axis direction of the irradiated light beam at the periphery of the opening on the surface opposite to the facing surface. Preferably, the communication port is formed and connected to the cooling chambers via the recess.
In the present invention, the pair of frame-shaped members are each formed with a recess. And a clearance gap is each formed between each recessed part and each translucent board | substrate by each arrange | positioning a translucent board | substrate in the surface opposite to the surface which opposes. The communication port communicates and connects the cooling chambers through these gaps. Thus, the cooling chambers can be easily connected to each other through the communication port only by providing the recesses on the outer surfaces of the pair of frame members.
In addition, since the cooling chambers can be connected to each other by simply providing the recesses on the outer surfaces of the pair of frame-shaped members, for example, the cooling fluid in each cooling chamber can be connected to the outside of each cooling chamber inside the pair of frame-shaped members. A pair of frame-shaped members can be easily manufactured as compared with a configuration in which holes that can flow to each other are formed and the cooling chambers are connected to each other through the holes.

In the light modulation element holder of the present invention, it is preferable that a slope is formed on the periphery of the opening so as to increase the opening area toward the recess.
In the present invention, a slope is formed on the periphery of the opening. And this slope is formed so that opening area may become large toward a recessed part. That is, this slope is formed so as to reduce the opening area toward the facing surface side. Accordingly, the cooling fluid in each cooling chamber can be circulated along the inclined surface, and the cooling fluid can be efficiently circulated to the light modulation elements arranged on the facing surfaces. Therefore, the light modulation element can be further efficiently cooled by the cooling fluid.

In the light modulation element holding body of the present invention, it is preferable that the side wall of the recess is formed in a curved surface so that the cooling fluid in the cooling chamber can be guided to a predetermined position.
According to the present invention, if the cooling fluid in the cooling chamber is guided to, for example, the communication port and / or the outlet at the side wall of the recess, the cooling fluid can be circulated more smoothly in each cooling chamber. The convection speed of the cooling fluid can be increased, and the light modulation element can be cooled more efficiently by the cooling fluid.

An optical device of the present invention is an optical device including a light modulation element that modulates a light beam emitted from a light source according to image information to form an optical image, and includes the above-described light modulation element holder and A plurality of fluid circulation members that are connected to the inlet and outlet of the light modulation element holding body, guide the cooling fluid to the outside of the cooling chamber, and guide the cooling fluid to the inside of the cooling chamber again. And
According to the present invention, since the optical device includes the above-described light modulation element holder and a plurality of fluid circulation members, it can enjoy the same operations and effects as the above-described light modulation element holder.
Further, by enclosing the cooling fluid not only in each cooling chamber of the light modulation element holder but also in a plurality of fluid circulation members, the capacity of the cooling fluid can be increased, and the heat of the light modulation element and the cooling fluid can be increased. The exchange ability can be improved.

The optical device of the present invention includes at least one optical conversion element that converts an optical characteristic of an incident light beam, and the optical conversion element is formed on the light-transmitting substrate and the light-transmitting substrate. And at least one of the translucent substrates constituting the light modulation element holding body, the translucent substrate constituting the optical conversion element. A substrate is preferred.
Here, as the optical conversion element, for example, a polarizing plate, a phase difference plate, a viewing angle correction plate, or the like can be employed.
According to the present invention, since at least one of the translucent substrates constituting the light modulation element holding body is a translucent substrate constituting the optical conversion element, not only the light modulation element. The heat generated in the optical conversion film by the light beam emitted from the light source can also be radiated to the cooling fluid that convects the cooling chamber via the translucent substrate.

In the optical device according to the aspect of the invention, the light modulation element includes a plurality of light modulation elements, and the light modulation element holding body includes a plurality of light modulation elements corresponding to the plurality of light modulation elements, and the cooling in the plurality of fluid circulation members. A fluid branching unit that is installed in a fluid flow path and that branches and sends out the cooling fluid that has flown into the plurality of light modulation element holders via the plurality of fluid circulation members; and the plurality of lights A color synthesizing optical device that has a plurality of light beam incident side end faces to which a modulation element holding body is attached, and synthesizes and emits the respective color lights modulated by the plurality of light modulation elements, and the fluid branching section includes: It is preferable that the color synthesizing optical device is attached to any one of the end surfaces intersecting with the plurality of light beam incident side end surfaces.
According to the present invention, the optical device includes the fluid branching portion, and the fluid branching portion branches and sends the internal cooling fluid for each of the plurality of light modulation element holders. Each light modulation element can be cooled by the cooling fluid having substantially the same temperature without the temperature of the cooling fluid flowing into the chamber being biased.
In addition, the cooling fluid can be increased in capacity by enclosing the cooling fluid not only in each cooling chamber of the light modulation element holding body and in the plurality of fluid circulation members but also in the fluid branching portion. And the heat exchange capacity between the cooling fluid and the cooling fluid can be improved.
Furthermore, since the fluid branching portion is attached to any one of the end faces intersecting with the plurality of light incident side end faces in the color synthesizing optical device, the optical device can be made compact and the optical device can be miniaturized.

In the optical device according to the aspect of the invention, it is preferable that the optical device includes a flow rate changing unit that can change the flow rate of the cooling fluid flowing through each of the light modulation element holding bodies according to the heat generation amount of the plurality of light modulation elements. .
Here, as the flow rate changing unit, for example, a configuration in which a valve is provided in the flow path of the cooling fluid and the flow path is narrowed or expanded by changing the position of the valve can be employed.
According to the present invention, by operating the flow rate changing unit, for example, the flow rate of the cooling fluid is increased for the light modulation element having a large calorific value, and the flow rate of the cooling fluid is set for the light modulation element having a small calorific value. By reducing the size, the temperature of each light modulation element can be made uniform with a simple configuration with high accuracy. Therefore, it is possible to maintain a good hue of the optical image formed by each light modulation element.

In the optical device according to the aspect of the invention, it is preferable that the plurality of fluid circulation members are formed of tubular members and have different tube diameters according to the heat generation amounts of the plurality of light modulation elements.
According to the present invention, for example, the fluid circulation member that circulates the cooling fluid with respect to the light modulation element with a large calorific value is increased in diameter, and the fluid that circulates the cooling fluid with respect to the light modulation element with a small calorific value. By reducing the tube diameter of the circulation member, the temperature of each light modulation element can be easily made uniform with a simple configuration. Therefore, it is possible to maintain a good hue of the optical image formed by each light modulation element.

In the optical device according to the aspect of the invention, the fluid branching portion includes a cooling fluid inflow portion that is connected to the plurality of fluid circulation members and allows the cooling fluid to flow into the inside, and a cooling fluid outflow portion that causes the cooling fluid to flow out to the outside. And it is preferable that the said cooling fluid inflow part and the said cooling fluid outflow part have a pipe shape which can distribute | circulate the said cooling fluid, and one edge part protrudes toward the inside of the said fluid branch part.
In the present invention, the fluid branch portion has a cooling fluid inflow portion and a cooling fluid outflow portion. One end portion of the cooling fluid inflow portion and the cooling fluid outflow portion protrudes toward the inside of the fluid branch portion. As a result, only the cooling fluid accumulated in the fluid branching portion can flow out. For example, even when the inside of the fluid branch portion is not completely filled with the cooling fluid, only the cooling fluid can flow out to the outside without mixing air.
Further, since not only the cooling fluid outflow portion but also the cooling fluid inflow portion protrudes toward the inside of the fluid branching portion, when the convection direction of the cooling fluid changes, that is, the internal cooling fluid at the cooling fluid inflow portion. Even when the cooling fluid is allowed to flow out and the cooling fluid is allowed to flow into the inside at the cooling fluid outflow portion, only the cooling fluid accumulated therein can be flowed out to the outside at the cooling fluid inflow portion.

The projector of the present invention preferably includes a light source device, the above-described optical device, and a projection optical device that magnifies and projects an optical image formed by the optical device.
According to the present invention, since the projector includes the light source device, the optical device described above, and the projection optical device, the projector can enjoy the same operations and effects as the optical device described above.
In addition, by providing the above-described optical device, it is possible to prevent thermal deterioration of the light modulation element and to extend the life of the projector.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Configuration of projector]
FIG. 1 is a diagram schematically showing a schematic configuration of the projector 1.
The projector 1 modulates a light beam emitted from a light source according to image information to form an optical image, and enlarges and projects the formed optical image on a screen. The projector 1 includes an exterior case 2, a cooling unit 3, an optical unit 4, and a projection lens 5 as a projection optical device.
Although not shown in FIG. 1, a power supply block, a lamp drive circuit, and the like are disposed in a space other than the cooling unit 3, the optical unit 4, and the projection lens 5 in the exterior case 2. .

The exterior case 2 is made of synthetic resin or the like, and is formed in a substantially rectangular parallelepiped shape that accommodates and arranges the cooling unit 3, the optical unit 4, and the projection lens 5 inside. Although not shown, the outer case 2 includes an upper case that constitutes the top, front, back, and side surfaces of the projector 1, and a lower case that constitutes the bottom, front, side, and back surfaces of the projector 1, respectively. The upper case and the lower case are fixed to each other with screws or the like.
The exterior case 2 is not limited to being made of synthetic resin, but may be formed of other materials, for example, metal.
Although not shown, the exterior case 2 includes an intake port (for example, an intake port 22 shown in FIG. 2) for introducing cooling air from the outside of the projector 1 by the cooling unit 3, and the inside of the projector 1. An exhaust port is formed for exhausting air warmed by the air.
Further, as shown in FIG. 1, the exterior case 2 is positioned at a corner portion of the exterior case 2 on the side of the projection lens 5 and isolates a radiator of an optical device (to be described later) of the optical unit 4 from other members. A partition wall 21 is formed.

The cooling unit 3 sends cooling air into a cooling flow path formed inside the projector 1 to cool heat generated in the projector 1. The cooling unit 3 is located on the side of the projection lens 5 and introduces cooling air outside the projector 1 from an air inlet (not shown) formed in the exterior case 2 into the liquid crystal of an optical device described later of the optical unit 4. The sirocco fan 31 that blows cooling air to the panel, and the cooling air outside the projector 1 are located inside the partition wall 21 formed in the outer case 2 and from the air inlet 22 (see FIG. 2) formed in the outer case 2 to the inside. An axial fan 32 that is introduced and blows cooling air to a later-described radiator of the optical unit 4 is provided.
Although not shown, the cooling unit 3 is a cooling unit for cooling a sirocco fan 31 and an axial fan 32, a light source device (to be described later) of the optical unit 4, a power supply block (not shown), a lamp driving circuit, and the like. It shall also have a fan.

The optical unit 4 is a unit that optically processes a light beam emitted from a light source to form an optical image (color image) corresponding to image information. As shown in FIG. 1, the optical unit 4 has a substantially L shape in plan view that extends along the back surface of the outer case 2 and extends along the side surface of the outer case 2. The detailed configuration of the optical unit 4 will be described later.
The projection lens 5 is configured as a combined lens in which a plurality of lenses are combined. The projection lens 5 enlarges and projects an optical image (color image) formed by the optical unit 4 on a screen (not shown).

[Detailed configuration of optical unit]
As shown in FIG. 1, the optical unit 4 includes an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an optical device 44, and an optical component housing that houses and arranges these optical components 41 to 44. 45.
The integrator illumination optical system 41 is an optical system for illuminating an image forming area of a liquid crystal panel, which will be described later, constituting the optical device 44 substantially uniformly. As shown in FIG. 1, the integrator illumination optical system 41 includes a light source device 411, a first lens array 412, a second lens array 413, a polarization conversion element 414, and a superimposing lens 415.

The light source device 411 includes a light source lamp 416 that emits a radial light beam, and a reflector 417 that reflects the emitted light emitted from the light source lamp 416. As the light source lamp 416, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is frequently used. In FIG. 1, a parabolic mirror is used as the reflector 417. However, the reflector 417 is not limited to this. It is good also as a structure which employ | adopted the collimated concave lens as follows.
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 device 411 into a plurality of partial light beams.
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 413 has a function of forming an image of each small lens of the first lens array 412 on a liquid crystal panel (to be described later) of the optical device 44 together with the superimposing lens 415.

The polarization conversion element 414 is disposed between the second lens array 413 and the superimposing lens 415, and converts light from the second lens array 413 into substantially one type of polarized light.
Specifically, each partial light converted into substantially one type of polarized light by the polarization conversion element 414 is finally substantially superimposed on a liquid crystal panel (described later) 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, and therefore approximately half of the light from the light source device 411 that emits randomly polarized light cannot be used. For this reason, by using the polarization conversion element 414, the light emitted from the light source device 411 is converted into substantially one type of polarized light, and the light use efficiency in the optical device 44 is increased.

As shown in FIG. 1, 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. Has a function of separating the light into three color lights of red, green, and blue.
As shown in FIG. 1, the relay optical system 43 includes an incident side lens 431, a relay lens 433, and reflection mirrors 432 and 434, and the red light separated by the color separation optical system 42 is red to be described later of the optical device 44. It has the function of leading to the light liquid crystal panel.

  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 a later-described liquid crystal panel for blue light of the optical device 44. The field lens 418 converts each partial light emitted from the second lens array 413 into a light beam parallel to the central axis (principal ray). The same applies to the field lens 418 provided on the light incident side of the other liquid crystal panel for green light and red light.

  Of the red 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 418, and reaches a later-described green light liquid crystal panel of the optical device 44. 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 a later-described red light liquid crystal panel of the optical device 44. 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.

As shown in FIG. 1, the optical device 44 includes three liquid crystal panels 441 (red liquid crystal panel 441R, green light liquid crystal panel 441G, blue light liquid crystal panel 441B as light modulation elements. The incident-side polarizing plate 442 and the emitting-side polarizing plate 443 as optical conversion elements disposed on the light incident side and the light emitting side of the liquid crystal panel 441, and a cross dichroic prism 444 as a color synthesizing optical device. Are integrally formed.
Although the specific configuration of the optical device 44 will be described later, in addition to the liquid crystal panel 441, the incident-side polarizing plate 442, the emission-side polarizing plate 443, and the cross dichroic prism 444, the main tank, the fluid pumping unit, the radiator, the fluid A circulation member, a fluid branching section, a light modulation element holding body, and a relay tank are provided.

  The liquid crystal panel 441 has a configuration in which a liquid crystal as an electro-optical material is hermetically sealed between a pair of substrates 441C and 441D (see FIG. 8) made of glass or the like. Of these, the substrate 441C (see FIG. 8) is a driving substrate for driving the liquid crystal, and a plurality of data lines arranged in parallel to each other and a plurality arranged in a direction orthogonal to the plurality of data lines. Scanning lines, pixel electrodes arranged in a matrix corresponding to the intersection of the scanning lines and the data lines, and switching elements such as TFTs. The substrate 441D (see FIG. 8) is a counter substrate that is disposed to face the substrate 441C at a predetermined interval, and has a common electrode to which a predetermined voltage Vcom is applied. These substrates 441C and 441D are electrically connected to a control device (not shown), and a flexible printed circuit board 441E that outputs a predetermined drive signal to the scanning line, the data line, the switching element, the common electrode, and the like. (See FIG. 8) are connected. By inputting a drive signal from the control device via the flexible printed circuit board 441E (see FIG. 8), a voltage is applied between the predetermined pixel electrode and the common electrode, and between the pixel electrode and the common electrode. The alignment state of the liquid crystal intervening is controlled, and the polarization direction of the polarized light beam emitted from the incident side polarizing plate 442 is modulated.

The incident-side polarizing plate 442 receives light of each color whose polarization direction is aligned in approximately one direction by the polarization conversion element 414, and of the incident light beams, is substantially the same as the polarization axis of the light beams aligned by the polarization conversion element 414. Only polarized light in the direction is transmitted, and other light beams are absorbed. The incident-side polarizing plate 442 has a configuration in which a polarizing film (not shown) as an optical conversion film is attached to a translucent substrate 442A (see FIG. 8) such as sapphire glass or quartz.
The exit-side polarizing plate 443 includes a light-transmitting substrate 443A and a polarizing film 443B (see FIG. 8) as an optical conversion film in the same manner as the incident-side polarizing plate 442, and includes incident light out of the light flux emitted from the liquid crystal panel 441. Only the light beam having a polarization axis orthogonal to the transmission axis of the light beam in the side polarizing plate 442 is transmitted, and other light beams are absorbed.

  The cross dichroic prism 444 is an optical element that synthesizes an optical image modulated for each color light emitted from the emission side polarizing plate 443 to form a color image. The cross dichroic prism 444 has a substantially square shape in plan view in which four right angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right angle prisms are bonded together. These dielectric multilayer films reflect the color light emitted from the liquid crystal panels 441R and 441B through the emission side polarizing plate 443, and transmit the color light emitted from the liquid crystal panel 441G through the emission side polarizing plate 443. In this manner, the color lights modulated by the liquid crystal panels 441R, 441G, and 441B are combined to form a color image.

FIG. 2 is a perspective view of a part of the projector 1 as viewed from above. In FIG. 2, the optical components in the optical component housing 45 are shown only for the optical device main body (to be described later) of the optical device 44 for the sake of simplicity, and the other optical components 41 to 43 are omitted. ing.
FIG. 3 is a perspective view of a part of the projector 1 as viewed from below.
The optical component housing 45 is made of, for example, a metal member. As shown in FIG. 1, a predetermined illumination optical axis A is set therein, and the optical components 41 to 43 and the optical device 44 described above are described later. The optical device main body to be stored is accommodated in a predetermined position with respect to the illumination optical axis A. The optical component casing 45 is not limited to a metal member, and may be composed of other materials, and is particularly preferably composed of a heat conductive material. As shown in FIG. 2, the optical component housing 45 includes a container-shaped component storage member 451 for storing optical components 41 to 43 and an optical device body to be described later of the optical device 44, and an opening of the component storage member 451. It comprises a lid-like member (not shown) that closes the portion.

Among these, the component storage member 451 constitutes a bottom surface, a front surface, and a side surface of the optical component housing 45, respectively.
In this component storage member 451, on the inner side surface of the side surface, as shown in FIG. 2, a groove portion 451A for slidingly fitting the above-described optical components 412 to 415, 418, 421 to 423, 431 to 434 from above is provided. Is formed.
Further, as shown in FIG. 2, a projection lens installation part 451 </ b> B for installing the projection lens 5 at a predetermined position with respect to the optical unit 4 is formed on the front part of the side surface. The projection lens installation portion 451B is formed in a substantially rectangular shape in plan view, and a circular hole (not shown) corresponding to the light beam emission position from the optical device 44 is formed in a substantially central portion in plan view. The color image formed at 4 is enlarged and projected by the projection lens 5 through the hole.
Further, in the component storage member 451, on the bottom surface, as shown in FIG. And a hole 451D formed corresponding to the cooling fluid inflow portion. Here, the cooling air introduced from the outside of the projector 1 by the sirocco fan 31 of the cooling unit 3 is discharged from the discharge port 31A (FIG. 3) of the sirocco fan 31 and guided to the hole 451C through a duct (not shown). It is burned.

[Configuration of optical device]
As shown in FIG. 2 or FIG. 3, the optical device 44 includes an optical device main body 440 (FIG. 2) in which a liquid crystal panel 441, an incident side polarizing plate 442, an emission side polarizing plate 443, and a cross dichroic prism 444 are integrated. , A main tank 445, a fluid pumping unit 446, a radiator 447, and a plurality of fluid circulation members 448.
The plurality of fluid circulation members 448 are formed of aluminum tubular members so that the cooling fluid can convect therein, and connect the members 440 and 445 to 447 so that the cooling fluid can circulate. Then, heat generated in the liquid crystal panel 441, the incident-side polarizing plate 442, and the emission-side polarizing plate 443 constituting the optical device body 440 is cooled by the circulating cooling fluid.
In the present embodiment, ethylene glycol, which is a transparent non-volatile liquid, is employed as the cooling fluid. The cooling fluid is not limited to ethylene glycol, and other liquids may be used.
Below, each member 440, 445-447 is demonstrated in order from the upstream with respect to the liquid crystal panel 441 along the flow path of the circulating cooling fluid.

FIG. 4 is a view showing the structure of the main tank 445. Specifically, FIG. 4A is a plan view of the main tank 445 viewed from above. FIG. 4B is a cross-sectional view taken along the line AA in FIG.
The main tank 445 has a substantially cylindrical shape and is composed of two container members made of aluminum. The main tank 445 temporarily accumulates the cooling fluid therein by connecting the opening portions of the two container members. These container-like members are connected by interposing an elastic member such as seal welding or rubber, for example.

As shown in FIG. 4B, the main tank 445 has a cooling fluid inflow portion 445A for injecting the cooling fluid into the interior and a cooling fluid outflow for outflowing the inside cooling fluid to the outside, as shown in FIG. A portion 445B is formed.
The cooling fluid inflow portion 445A and the cooling fluid outflow portion 445B are configured by a substantially cylindrical member having a tube diameter smaller than the tube diameter of the fluid circulation member 448, and are disposed so as to protrude in and out of the main tank 445. ing. One end of the fluid circulation member 448 is connected to one end protruding to the outside of the cooling fluid inflow portion 445 </ b> A, and cooling fluid from the outside flows into the main tank 445 through the fluid circulation member 448. In addition, one end of the fluid circulation member 448 is connected to one end protruding to the outside of the cooling fluid outflow portion 445B, and the cooling fluid inside the main tank 445 flows out to the outside through the fluid circulation member 448.
Further, the other ends protruding inward of the cooling fluid inflow portion 445A and the cooling fluid outflow portion 445B extend toward the cylindrical axis of the main tank 445, as shown in FIG. They are arranged so as to be orthogonal to each other. As described above, the cooling fluid inflow portion 445A and the cooling fluid outflow portion 445B are arranged so as to be substantially orthogonal in a plan view, so that the cooling fluid that has flowed into the main tank 445 via the cooling fluid inflow portion 445A can be obtained. Therefore, it is possible to prevent the cooling fluid outflow portion 445B from immediately flowing out to the outside, and the cooling fluid that has flowed in is mixed with the cooling fluid inside the main tank 445 so as to equalize the temperature of the cooling fluid.

In addition, on the outer peripheral surface of the main tank 445, three fixing portions 445C are formed in each of the two container-like members, as shown in FIG. By inserting a screw 445D (FIGS. 2 and 3) through 445C and screwing it into the bottom surface of the outer case 2, the two container-like members are closely connected to each other, and the main tank 445 is attached to the outer case 2. Fixed.
As shown in FIG. 1 or FIG. 2, the main tank 445 is disposed in a triangular region in plan view formed by the optical component housing 45 and the inner surface of the outer case 2. By disposing the main tank 445 in this region, the storage efficiency in the outer case 2 can be improved, and the projector 1 does not increase in size.

The fluid pumping unit 446 sends in the cooling fluid accumulated in the main tank 445 and forcibly sends out the sent cooling fluid to the outside. For this reason, as shown in FIG. 3, the fluid pumping part 446 is connected to the other end of the fluid circulation member 448 connected to the cooling fluid outflow part 445B of the main tank 445, and sends the cooling fluid to the outside. The other fluid circulation member 448 is connected in communication with one end.
Although not specifically illustrated, the fluid pumping unit 446 has, for example, a configuration in which an impeller is disposed in a substantially rectangular parallelepiped aluminum hollow member, and is controlled by a control device (not illustrated). By rotating the impeller, the cooling fluid accumulated in the main tank 445 is forcibly sent via the fluid circulation member 448, and the sent cooling fluid is forcibly sent to the outside via the fluid circulation member 448. To send. In such a configuration, the fluid pressure feeding unit 446 can reduce the thickness dimension of the impeller in the rotation axis direction, and can be disposed in an empty space inside the projector 1. Improvement can be achieved and the projector 1 will not be enlarged. In the present embodiment, the fluid pumping unit 446 is disposed below the projection lens 5 as shown in FIG. 2 or FIG.

5 and 6 are diagrams showing a schematic configuration of the optical device main body 440. FIG. Specifically, FIG. 5 is a perspective view of the optical device main body 440 as viewed from above. FIG. 6 is a perspective view of the optical device body 440 as viewed from below.
The optical device main body 440 includes three liquid crystal panels 441, three incident side polarization plates 442, three emission side polarization plates 443, and a cross dichroic prism 444, as well as a fluid branching portion 4401 as shown in FIGS. And three light modulation element holders 4402, three support members 4403, and a relay tank 4404 (FIG. 5).

FIG. 7 is a view showing the structure of the fluid branching portion 4401. Specifically, FIG. 7A is a plan view of the fluid branch portion 4401 viewed from above. FIG. 7B is a cross-sectional view taken along the line BB in FIG.
The fluid branching portion 4401 is formed of a substantially rectangular parallelepiped aluminum hollow member, which sends in the cooling fluid forcibly sent out from the fluid pressure sending portion 446, and sends the cooling fluid into three light modulation element holding bodies. It branches and sends every 4402. In addition, the fluid branching portion 4401 is fixed to a lower surface that is an end surface intersecting with the three light flux incident side end surfaces of the cross dichroic prism 444, and also has a function as a prism fixing plate that supports the cross dichroic prism 444.
In this fluid branching portion 4401, a cooling fluid inflow portion 4401A for allowing the cooling fluid pumped from the fluid pumping portion 446 to flow into the inside is formed at a substantially central portion of the bottom surface as shown in FIG. 7B. . This cooling fluid inflow portion 4401A is composed of a substantially cylindrical member having a pipe diameter smaller than the diameter of the fluid circulation member 448, similar to the cooling fluid inflow portion 445A of the main tank 445. It is arranged to protrude. The other end of the fluid circulation member 448 communicated with the fluid pumping portion 446 is connected to one end protruding to the outside of the cooling fluid inflow portion 4401A, and is pumped from the fluid pumping portion 446 via the fluid circulation member 448. The cooled cooling fluid flows into the fluid branch portion 4401.
Also, as shown in FIG. 7A, arm portions 4401B extending along the bottom surface are formed at the four corners of the bottom surface, respectively. Holes 4401B1 are respectively formed at the tip portions of these arm portions 4401B. Screws (not shown) are inserted into the holes 4401B1 and screwed into the component housing member 451 of the optical component housing 45, whereby the optical device main body 440 is obtained. Is fixed to the component storage member 451. At this time, the fluid branch portion 4401 and the optical component casing 45 are connected so as to be capable of transferring heat. In this way, the fluid branching portion 4401 is connected to the optical component housing 45 so as to be able to transfer heat, thereby securing a heat transfer path from the circulating cooling fluid to the fluid branching portion 4401 to the optical component housing 45. Thus, the cooling efficiency of the cooling fluid can be improved, and as a result, the cooling efficiency of the liquid crystal panel 441, the incident side polarizing plate 442, and the emission side polarizing plate 443 can be improved by the cooling fluid. Further, if the sirocco fan 31 is blown along the bottom surface of the optical component casing 45, the heat radiation area of the circulating cooling fluid can be increased, and the cooling efficiency can be improved.

Further, in this fluid branching portion 4401, the three cooling modulators held by the three light modulation elements are held on the three side surfaces corresponding to the light incident side end surface of the cross dichroic prism 444 as shown in FIG. A cooling fluid outflow portion 4401C is formed to branch out and flow out for each body 4402.
Like the cooling fluid inflow portion 4401A, these cooling fluid outflow portions 4401C are formed of a substantially cylindrical member having a tube diameter smaller than the tube diameter of the fluid circulation member 448, and project into the fluid branching portion 4401. Is arranged. One end of each cooling fluid outflow portion 4401C that protrudes to the outside is connected to one end of a fluid circulation member 448, and the cooling fluid inside the fluid branch portion 4401 is branched via the fluid circulation member 448 to the outside. And leaked.
Further, in the fluid branching portion 4401, a spherical bulging portion 4401D is formed at a substantially central portion of the upper surface as shown in FIG. The position of the cross dichroic prism 444 in the tilt direction relative to the fluid branching portion 4401 can be adjusted by bringing the lower surface of the cross dichroic prism 444 into contact with the bulging portion 4401D.

FIG. 8 is an exploded perspective view showing a schematic configuration of the light modulation element holding body 4402.
The three light modulation element holding bodies 4402 hold the three liquid crystal panels 441, the three incident side polarizing plates 442, and the three emission side polarizing plates 443, respectively, and a cooling fluid flows in and out of the inside. The three liquid crystal panels 441, the three incident side polarizing plates 442, and the three outgoing side polarizing plates 443 are cooled by the fluid. Each light modulation element holder 4402 has the same configuration, and only one light modulation element holder 4402 will be described below.
As shown in FIG. 8, the light modulation element holding body 4402 includes a pair of frame-like members 4405 and 4406, four elastic members 4407, a pair of polarizing plate fixing members 4408A and 4408B, and an intermediate frame 4409. .

FIG. 9 is a diagram showing a schematic configuration of the frame-like member 4405. As shown in FIG. Specifically, FIG. 9A is a perspective view of the frame-like member 4405 as viewed from the light beam emission side. FIG. 9B is a perspective view of the frame member 4405 as viewed from the light beam incident side.
The frame-like member 4405 is a substantially rectangular aluminum frame having a rectangular opening 4405A corresponding to the image forming area of the liquid crystal panel 441 in the substantially central portion. It is arranged on the incident side and supports the light beam incident side of the liquid crystal panel 441 and also supports the light beam emission side of the incident side polarizing plate 442.

In this frame-shaped member 4405, a concave portion 4405B having a shape corresponding to the shape of a second elastic member described later of the elastic member 4407 is formed on the end surface on the light beam exit side, as shown in FIG. 9A. 4405B supports the light beam incident side end face of the liquid crystal panel 441 via the second elastic member and the intermediate frame 4409. The frame-shaped member 4405 supports the light beam incident side end surface of the liquid crystal panel 441, so that the light beam is emitted from the opening 4405 A at the second elastic member, the intermediate frame 4409, and the light beam incident side end surface of the liquid crystal panel 441. The side is blocked.
As shown in FIG. 9 (A) or FIG. 9 (B), the upper corner portion of the concave portion 4405B and the substantially horizontal central portion on the lower side penetrate the light beam emission side end surface and the light beam incident side end surface. Three insertion holes 4405C and 4405D are formed through which a cylindrical portion to be described later of the frame-like member 4406 can be inserted.

Further, in this frame-shaped member 4405, a rectangular frame-shaped concave portion 4405E corresponding to the shape of the first elastic member described later of the elastic member 4407 is formed on the end surface on the light incident side, as shown in FIG. 9B. The incident side polarizing plate 442 is supported by the concave portion 4405E via the first elastic member. The frame-shaped member 4405 supports the light exit side end face of the incident side polarizing plate 442, so that the light entrance side of the opening 4405A is on the end face of the first elastic member and the light exit side of the incident side polarizing plate 442. Blocked.
As shown in FIG. 9B, the opening 4405A is chamfered at the corner on the light incident side so that the opening area increases from the end surface on the light emitting side toward the end surface on the light incident side, and an inclined surface 4405A1 is formed. Have.
Further, as shown in FIG. 9 (B), a concave portion 4405F having a depth dimension larger than that of the concave portion 4405E is provided on the end surface of the light beam incident side on the upper and lower end portions of the opening 4405A, and three insertion holes 4405C and 4405D are provided. Are formed to connect with each other.
Of these recesses 4405F, the upper side wall of the recess 4405F located on the upper side is formed in a curved surface so that the substantially central portion in the left-right direction protrudes downward and becomes convex. Similarly, the lower side wall of the recess 4405F located on the lower side is also formed in a curved surface so that the substantially central portion in the left-right direction is recessed downward.
As described above, when the light incident side and light exit side of the opening 4405A are closed by the liquid crystal panel 441 and the incident side polarizing plate 442, the inside of the frame-shaped member 4405 (inside the opening 4405A and the concave portion 4405F and the incident side polarized light). A cooling chamber R1 (see FIG. 14 or FIG. 15) is formed in which a cooling fluid can be enclosed in a gap between the plate 442 and the plate 442.

Further, in the frame-shaped member 4405, connection portions 4405G for connecting to the frame-shaped member 4406 are formed at the left end corner portion and the right end corner portion as shown in FIG.
Furthermore, in this frame-shaped member 4405, hooks 4405H with which the polarizing plate fixing member 4408A is engaged are formed at the left end portion substantially central portion and the right end portion substantially center portion, as shown in FIG.

FIG. 10 is a diagram showing a schematic configuration of the frame-like member 4406. As shown in FIG. Specifically, FIG. 10A is a perspective view of the frame-shaped member 4406 as viewed from the light beam emission side. FIG. 10B is a perspective view of the frame-shaped member 4406 as viewed from the light beam incident side.
The frame-shaped member 4406 has a substantially rectangular aluminum frame in plan view having a rectangular opening 4406A corresponding to the image forming area of the liquid crystal panel 441 at a substantially central portion, similar to the frame-shaped member 4405 described above. It is. The frame-shaped member 4406 sandwiches the liquid crystal panel 441 between the frame-shaped member 4405 and the above-described frame-shaped member 4405 via the elastic member 4407 and the intermediate frame 4409, and is opposite to the surface facing the frame-shaped member 4405. The exit side polarizing plate 443 is supported through the elastic member 4407 on the surface side.
In this frame-shaped member 4406, a rectangular frame-shaped concave portion 4406B corresponding to the shape of a later-described fourth elastic member of the elastic member 4407 is formed on the end surface on the light beam exit side, as shown in FIG. The concave portion 4406B supports the emission-side polarizing plate 443 through the fourth elastic member. The frame-shaped member 4406 supports the light incident side end face of the exit side polarizing plate 443, so that the light exit side of the opening 4406A is on the end surface of the light incident side of the fourth elastic member and the exit side polarizing plate 443. Blocked.

As shown in FIG. 10 (A) or FIG. 10 (B), there are three insertion holes 4405C in the above-mentioned frame-shaped member 4405 in the upper corner portion of the recess 4406B and the substantially central portion in the left-right direction on the lower side. , 4405D, three cylindrical portions 4406C and 4406D are formed which have holes 4406C1 and 4406D1 penetrating the end surface on the light emission side and the end surface on the light incident side, and project substantially orthogonally from the end surface on the light incident side. Yes. In a state where the frame-shaped member 4406 and the frame-shaped member 4405 are combined, the cylindrical portions 4406C and 4406D of the frame-shaped member 4406 are inserted into the insertion holes 4405C and 4405D of the frame-shaped member 4405, respectively. The cooling fluid can flow through the light beam exit side and the light beam incident side of the frame-like member 4405 through the holes 4406C1 and 4406D1 and the insertion holes 4405C and 4405D of the cylindrical portions 4406C and 4406D.
That is, the three insertion holes 4405C and 4405D in the frame-shaped member 4405 and the three cylindrical portions 4406C and 4406D in the frame-shaped member 4406 correspond to the communication port according to the present invention.
Here, the inner diameter of the cylindrical portions 4406C and 4406D is, for example, preferably 1 mm to 5 mm, and more preferably 2 mm to 3 mm. It is preferable that the inner diameter cross-sectional area of the cylindrical portion 4406C and the sum of the inner diameter cross-sectional areas of the two cylindrical portions 4406D have substantially the same cross-sectional area. In addition, the inner diameters of the insertion holes 4405C and 4405D may be dimensions that allow the tubular portions 4406C and 4406D to be fitted, respectively. With this configuration, the flow resistance of the cooling fluid flowing through the cylindrical portion 4406C and the insertion portion 4405C, the cylindrical portion 4406D, and the insertion portion 4405D can be made substantially the same, and the cooling fluid Can be smoothly distributed.
The configuration in which the inner diameter cross-sectional area of the cylindrical portion 4406C and the sum of the inner diameter cross-sectional areas of the two cylindrical portions 4406D are not substantially the same cross-sectional area may be adopted. .

The tubular portion 4406C is connected in communication so as to be substantially orthogonal to an inlet described later. A part of the inner side surface of the cylindrical portion 4406C extends so as to intersect the central axis of the inflow port, and the cooling fluid that has flowed in through the inflow port is transferred to a part of the inner side surface. Projecting portion 4406C2 that diverts to the light beam entrance side (cooling chamber R1 (see FIG. 14 or FIG. 15)) of the cylindrical member 4405 and the light beam exit side (cooling chamber R2 (see FIG. 14 or FIG. 15) described later) of the frame-shaped member 4406. (See FIG. 14 or FIG. 15).
That is, the cylindrical portion 4406C in the frame-shaped member 4406 and the insertion hole 4405C in the frame-shaped member 4405 correspond to the diversion port according to the present invention. Further, the two cylindrical portions 4406D in the frame-shaped member 4406 and the two insertion holes 4405D in the frame-shaped member 4405 correspond to the junction according to the present invention.
The protrusion 4406C2 (see FIG. 14 or FIG. 15) has a substantially triangular prism shape, and is formed so that the axial direction thereof is parallel to the light beam incident side end surface and the light beam emission side end surface of the frame-shaped member 4406. That is, one of the three triangular prism-shaped side surfaces is connected to the inner wall of the cylindrical portion 4406C, and the other two side surfaces are formed to face the light beam incident side and the light beam emission side, respectively. Then, by such a protrusion 4406C2 (see FIG. 14 or FIG. 15), the cooling fluid that has flowed in through the inlet described later is guided to the two side surfaces, and the light beam incident side (cooling chamber R1) of the frame-shaped member 4405 (See FIG. 14 or FIG. 15)) and the light beam exit side of the frame-like member 4406 (cooling chamber R2 (see FIG. 14 or FIG. 15) described later).

Note that the formation position of the protrusion 4406C2 (see FIG. 14 or FIG. 15) is not limited to the position intersecting the central axis of the inflow port, and the liquid crystal panel 441 to be cooled by the cooling fluid, the incident-side polarizing plate 442, and What is necessary is just to form in the position according to the magnitude | size of the emitted-heat amount of the emission side polarizing plate 443. FIG. For example, when the amount of heat generated by the counter substrate 441D and the incident side polarizing plate 442 of the liquid crystal panel 441 is larger than the amount of heat generated by the driving substrate 441C and the emission side polarizing plate 443 of the liquid crystal panel 441, the protrusion 4406C2 (FIG. 14 or FIG. 15) may be formed at a position shifted from the position intersecting the central axis of the inlet by a predetermined distance toward the light beam exit side. On the contrary, when the heat generation amount of the drive substrate 441C and the emission side polarizing plate 443 of the liquid crystal panel 441 is larger than the heat generation amount of the counter substrate 441D and the incident side polarization plate 442 of the liquid crystal panel 441, the protrusion 4406C2 ( 14 or 15) may be formed at a position shifted from the position intersecting the central axis of the inlet by a predetermined distance to the light beam incident side.
The shape of the protrusion 4406C2 (see FIG. 14 or FIG. 15) is not limited to a substantially triangular prism shape, but may be any shape as long as the cooling fluid flowing from the inflow port can be divided into the light beam incident side and the light beam emission side. Other shapes may also be used. For example, a configuration in which the two side surfaces are recessed on the inner side and the side surfaces have a substantially concave shape, or a configuration in which the two side surfaces bulge outward and the protrusion has a substantially hemispherical cross section is adopted. Also good.

In addition, as shown in FIG. 10A, the opening 4406A has a light flux such that the opening area increases from the light incident side end face to the light emission side end face, similarly to the opening 4405A in the frame-like member 4405. The corner on the exit side is chamfered and has a slope 4406A1.
Further, as shown in FIG. 10 (A), a concave portion 4406E having a depth dimension larger than the concave portion 4406B is formed on the end surface of the light beam emission side at the periphery of the upper and lower end portions of the opening 4406A. The holes 4406C1 and 4406D1 are formed so as to be connected to each other.
Of these recesses 4406E, the recess 4406E positioned on the upper side is formed in a curved shape so that the substantially central portion in the left-right direction is recessed toward the light beam incident side. Two rectifying portions 4406F that rectify the cooling fluid are provided upright at a substantially central portion of the concave portion 4406E in the left-right direction.
These rectifying portions 4406F are substantially quadrangular prisms, are arranged at predetermined intervals, and are formed in a concave curved surface in which the corner portions facing the holes 4406D1 of the two cylindrical portions 4406D are recessed inward. .

Further, in the frame-shaped member 4406, a rectangular frame-shaped concave portion 4406G corresponding to the shape of a third elastic member, which will be described later, of the elastic member 4407 is formed on the end surface of the light incident side as shown in FIG. The concave portion 4406G supports the light emission side end surface of the liquid crystal panel 441 through the third elastic member. The frame-shaped member 4406 supports the light emission side end surface of the liquid crystal panel 441, so that the light incident side of the opening 4406A is blocked by the third elastic member and the light emission side end surface of the liquid crystal panel 441.
As described above, when the light incident side and the light exit side of the opening 4406A are closed by the liquid crystal panel 441 and the exit side polarizing plate 443, the inside of the frame-like member 4406 (inside the opening 4406A and the recess 4406E and the exit side polarized light). A cooling chamber R <b> 2 (see FIG. 14 or FIG. 15) capable of enclosing a cooling fluid in a gap between the plate 443 and the plate 443 is formed.

  Further, in this frame-like member 4406, an inflow port 4406H through which the cooling fluid flowing out from the cooling fluid outflow portion 4401C of the fluid branching portion 4401 flows into the inside at a substantially central portion of the lower end portion thereof as shown in FIG. Is formed. The inflow port 4406H is formed of a substantially cylindrical member having a pipe diameter smaller than the pipe diameter of the fluid circulation member 448, and is formed so as to protrude to the outside of the frame-like member 4406. The other end of the fluid circulation member 448 connected to the cooling fluid outflow portion 4401C of the fluid branch portion 4401 is connected to the protruding end portion of the inflow port 4406H, and the fluid branch portion 4401 is connected via the fluid circulation member 448. The cooling fluid flowing out of the refrigerant flows into the cooling chamber R1 (see FIG. 14 or FIG. 15) and the cooling chamber R2 (see FIG. 14 or FIG. 15) via the cylindrical portion 4406C and the insertion hole 4405C.

Furthermore, in the frame-like member 4406, at the substantially central portion of the upper end thereof, as shown in FIG. 10, a cooling chamber R1 (see FIG. 14 or 15) and a cooling chamber R2 (see FIG. 14 or FIG. 15). An outflow port 4406I is formed to discharge the cooling fluid in the inside. In other words, the outlet 4406I is formed at a position opposite to the inlet 4406H. Similar to the inlet 4406H, the outlet 4406I is composed of a substantially cylindrical member having a pipe diameter smaller than the pipe diameter of the fluid circulation member 448, and is formed so as to protrude outside the frame-like member 4406. ing. A fluid circulation member 448 is connected to the projecting end of the outlet 4406I, and the cooling fluid in the cooling chamber R2 (see FIG. 14 or FIG. 15) that flows in via the inlet 4406H and the inlet 4406H are connected to each other. Through the projecting portion 4406C2 of the cylindrical portion 4406C, and flows into the cooling chamber R1 (see FIG. 14 or FIG. 15), and enters the cooling chamber R1 (see FIG. 14) through the cylindrical portion 4406D and the insertion hole 4405D. Alternatively, the cooling fluid that has flowed into the cooling chamber R2 (see FIG. 14 or FIG. 15) from the cooling chamber R2 flows out through the fluid circulation member 448.
In the present embodiment, the inner diameter cross-sectional areas of the inlet 4406H and the outlet 4406I are set to be substantially the same as the inner diameter cross-sectional area of the cylindrical portion 4406C or the sum of the inner diameter cross-sectional areas of the two cylindrical portions 4406D. doing. With such a configuration, the flow resistance of the cooling fluid in the light modulation element holder 4402 can be made substantially the same, and the convection speed of the cooling fluid can be increased.
Note that the inner diameter cross-sectional areas of the inlet 4406H and the outlet 4406I are not limited to the configuration in which the inner diameter sectional area of the cylindrical portion 4406C or the sum of the inner diameter sectional areas of the two cylindrical portions 4406D is substantially the same. A configuration having a cross-sectional area may be adopted.

Further, in this frame-shaped member 4406, at the upper corner portion and the lower corner portion, as shown in FIG. Is formed.
Further, in this frame-like member 4406, a connecting portion 4406K for connecting to the frame-like member 4405 is formed at the left end corner portion and the right end corner portion as shown in FIG. Then, screws 4406M (FIG. 8) are screwed into the connection portions 4405G and 4406K of the frame-shaped members 4405 and 4406, so that the liquid crystal panel 441 has the intermediate frame 4409 and the second elastic member and the second elastic member 4407 described later. It is sandwiched between the frame-shaped members 4405 and 4406 via the three elastic members, and the facing surface sides of the openings 4405A and 4406A of the frame-shaped members 4405 and 4406 are sealed.
Furthermore, in the frame-shaped member 4406, hooks 4406L with which the polarizing plate fixing member 4408B engages are formed at the left end portion substantially central portion and the right end portion substantially center portion, as shown in FIG.

As shown in FIG. 8, the elastic member 4407 is interposed between the first elastic member 4407A interposed between the incident-side polarizing plate 442 and the frame-shaped member 4405, and interposed between the frame-shaped member 4405 and the liquid crystal panel 441. The second elastic member 4407B, the third elastic member 4407C interposed between the liquid crystal panel 441 and the frame-like member 4406, and the fourth elasticity interposed between the frame-like member 4406 and the emission-side polarizing plate 443. It is comprised with member 4407D.
Among these, the first elastic member 4407A, the third elastic member 4407C, and the fourth elastic member 4407D are formed in a substantially rectangular frame shape as shown in FIG. 8, and the concave portions 4405E and 4406G of the frame-shaped members 4405 and 4406 are formed. , 4406B.
Further, as shown in FIG. 8, the second elastic member 4407B is formed in a substantially rectangular frame shape, and the upper elastic corner portion and the frame member 4406 3 at the substantially central portion in the left-right direction at the lower end portion. Three insertion holes 4407B1 through which the two cylindrical portions 4406C (FIG. 10B) and 4406D can be inserted are formed and installed in the recess 4405B of the frame-shaped member 4405.
These elastic members 4407 seal the cooling chambers R1, R2 (see FIG. 14 or FIG. 15) of the frame-shaped members 4405, 4406, and the incident-side polarizing plate 442, the frame-shaped member 4405, the frame-shaped member 4405, and the like. The liquid crystal panel 441, the liquid crystal panel 441, the frame-shaped member 4406, the cooling fluid is prevented from leaking between the frame-shaped member 4406 and the exit side polarizing plate 443, and the three cylindrical portions 4406 </ b> C and 4406 </ b> D and the three insertion holes 4405 </ b> C. , 4405D to prevent the cooling fluid from leaking to the liquid crystal panel 441 side.

As these elastic members 4407, silicon rubber having elasticity can be adopted, and those having surface treatment for increasing the cross-linking density of the surface layer on both sides or one side are preferable. For example, as such an elastic member 4407, Sircon GR-d series (trademark of Fuji Polymer Industries) can be adopted. As described above, by performing the surface treatment on the end face, the work of installing the elastic member 4407 in each of the concave portions 4405B, 4405E, 4406B, and 4406G can be easily performed.
Note that the elastic member 4407 is not limited to silicon rubber, and butyl rubber or fluorine rubber having a small moisture permeation amount may be used.

  The polarizing plate fixing members 4408A and 4408B are configured such that the incident-side polarizing plate 442 and the emission-side polarizing plate 443 are respectively inserted into the concave portions 4405E and 4406B of the frame-shaped members 4405 and 4406 via the first elastic member 4407A and the fourth elastic member 4407D. Press and fix. As shown in FIG. 8, these polarizing plate fixing members 4408A and 4408B are configured by a substantially rectangular frame in plan view in which openings 4408A1 and 4408B1 are formed in a substantially central portion, and at the peripheral portions of the openings 4408A1 and 4408B1. The incident side polarizing plate 442 and the emission side polarizing plate 443 are pressed against the frame-shaped members 4405 and 4406, respectively. The polarizing plate fixing members 4408A and 4408B are respectively formed with hook engaging portions 4408A2 and 4408B2 at the left and right side edges, and the hook engaging portions 4408A2 and 4408B2 are respectively connected to the hooks 4405H and 4406L of the frame-shaped members 4405 and 4406L. , The polarizing plate fixing members 4408A and 4408B are fixed to the frame-shaped members 4405 and 4406 in a state where the incident side polarizing plate 442 and the emitting side polarizing plate 443 are pressed.

The intermediate frame 4409 is made of an aluminum plate having a substantially rectangular shape in plan view, and holds the liquid crystal panel 441 and positions the liquid crystal panel 441 at a predetermined position of the frame-shaped members 4405 and 4406.
In the intermediate frame 4409, a rectangular opening 4409A into which the counter substrate 441D of the liquid crystal panel 441 can be fitted is formed at a substantially central portion as shown in FIG. 8, and the counter substrate 441D of the liquid crystal panel 441 is formed. Is fitted into the opening 4409A, whereby the liquid crystal panel 441 is positioned with respect to the intermediate frame 4409.
In addition, a stepped portion 4409B for arranging the drive substrate 441C in a loosely fitted state in a state where the counter substrate 441D is fitted to the opening 4409A is formed at the periphery of the opening 4409A. Here, the dimension between the stepped portion 4409B and the end face of the intermediate frame 4409 on the light beam incident side is set smaller than the thickness dimension of the counter substrate 441D, and the counter substrate 441D is fitted into the opening 4409A. When the light incident side end surface of the counter substrate 441D and the light incident side end surface of the intermediate frame 4409 are substantially flush, a gap 4409C is provided between the stepped portion 4409B and the drive substrate 441C (see FIG. 14 or FIG. 15). Is formed. The liquid crystal panel 441 is positioned and fixed with respect to the intermediate frame 4409 by filling the gap 4409C (see FIG. 14 or FIG. 15) with an adhesive having a high elongation rate.
Further, the upper side of the stepped portion 4409B extends to the upper edge of the intermediate frame 4409, and in a state where the liquid crystal panel 441 is positioned and fixed to the intermediate frame 4409, the flexible printed board 441E of the liquid crystal panel 441 is provided. Are arranged in the upper step 4409B without being bent.

  Further, in the intermediate frame 4409, as shown in FIG. 8, a cylindrical portion 4406C (FIG. 10) of the frame-like member 4406 is provided at the upper end corner portion and the substantially horizontal central portion of the lower end portion. (B)), three insertion holes 4409D through which 4406D can be inserted are formed. These insertion holes 4409D function as holes for positioning the intermediate frame 4409 with respect to the frame-shaped member 4406, and the intermediate frame 4409 is in a state where the liquid crystal panel 441 is positioned and fixed with respect to the intermediate frame 4409 in advance. By inserting the cylindrical portions 4406C and 4406D of the frame-shaped member 4406 through the three insertion holes 4409D, the intermediate frame 4409 is positioned with respect to the frame-shaped member 4406. That is, the liquid crystal panel 441 is positioned in the frame-shaped member 4406. Is positioned at a predetermined position.

The support member 4403 is formed of a plate body having a rectangular frame shape in plan view in which an opening (not shown) is formed in a substantially central portion.
As shown in FIG. 5 or 6, the support member 4403 has a pin-like member 4403 </ b> A that protrudes from the plate at a position corresponding to the four insertion portions 4406 </ b> J of the light modulation element holding body 4402 on the light incident side end surface. Is formed.
By the way, when the three light modulation element holding bodies 4402 are attached to the respective light beam incident side end surfaces of the cross dichroic prism 444, it is necessary to adjust the positions of the three liquid crystal panels 441. For example, a configuration in which a plurality of spacers are interposed between the light modulation element holding body 4402 and the cross dichroic prism 444 and the positions of the spacers are moved to adjust the positions of the liquid crystal panels 441 is considered. However, in such a configuration, the number of assembling steps for installing the plurality of spacers increases, and a troublesome work of removing the plurality of spacers occurs even when each light modulation element holding body 4402 is removed due to repair or the like.
In the present embodiment, the support member 4403 supports the light modulation element holding body 4402 by inserting the pin-shaped member 4403A through the four insertion portions 4406J of the light modulation element holding body 4402, and the end surface on the light beam emission side of the plate body. Is bonded and fixed to the light beam incident side end face of the cross dichroic prism 444, whereby the light modulation element holding body 4402 can be integrated with the cross dichroic prism 444. That is, the above-described spacer corresponds to the pin-shaped member 4403A formed on the support member 4403, and the spacer is formed integrally with the support member 4403, so that the light modulation element holding body 4402 is replaced with the cross dichroic prism 444. The attachment work and the removal work can be easily performed.

FIG. 11 is a diagram illustrating the structure of the relay tank 4404. Specifically, FIG. 11A is a plan view of the relay tank 4404 as viewed from above. FIG. 11B is a cross-sectional view taken along line CC in FIG.
The relay tank 4404 is formed of a substantially cylindrical hollow member made of aluminum, and is fixed to an upper surface that is an end surface that intersects the three light beam incident side end surfaces of the cross dichroic prism 444. And this relay tank 4404 sends in the cooling fluid sent out from each light modulation element holding body 4402 in a lump, and sends out the sent cooling fluid to the outside.
As shown in FIG. 11, the relay tank 4404 has three cooling fluid inflow portions 4404 </ b> A through which the cooling fluid sent from each light modulation element holding body 4402 flows into the relay tank 4404. These cooling fluid inflow portions 4404A are formed of a substantially cylindrical member having a pipe diameter smaller than the pipe diameter of the fluid circulation member 448, and are disposed so as to protrude into and out of the relay tank 4404. The other ends of the fluid circulation members 448 connected to the respective outlets 4406I of the three light modulation element holding bodies 4402 are connected to the end portions protruding outside the respective cooling fluid inflow portions 4404A, and the fluid circulation members The cooling fluid sent from each light modulation element holding body 4402 via 448 flows into the relay tank 4404 at once.

  Further, in the relay tank 4404, a cooling fluid outflow portion 4404B is formed on the lower side of the outer side surface to allow the supplied cooling fluid to flow out as shown in FIG. Like the cooling fluid inflow portion 4404A, the cooling fluid outflow portion 4404B is composed of a substantially cylindrical member having a tube diameter smaller than the tube diameter of the fluid circulation member 448, and protrudes into and out of the relay tank 4404. Has been placed. Then, one end of the fluid circulation member 448 is connected to the end portion protruding to the outside of the cooling fluid outflow portion 4404B, and the cooling fluid inside the relay tank 4404 flows out to the outside via the fluid circulation member 448.

FIG. 12 is a diagram showing the structure of the radiator 447 and the positional relationship between the radiator 447 and the axial fan 32. Specifically, FIG. 12A is a perspective view of the radiator 447 and the axial fan 32 as viewed from above. FIG. 12B is a plan view of the radiator 447 and the axial fan 32 viewed from the radiator 447 side.
As shown in FIG. 1 or FIG. 2, the radiator 447 is disposed in the partition wall 21 formed in the exterior case 2. The heat of the cooling fluid heated by the plate 443 is radiated. As shown in FIG. 12, the radiator 447 includes a fixed portion 4471, a tubular member 4472, and a plurality of fins 4473.
The fixing portion 4471 is made of, for example, a heat conductive member such as a metal, and has a substantially U shape in plan view as shown in FIG. 12B. A tubular member 4472 is formed on the opposite U-shaped end edges. It can be inserted. The fixing portion 4471 supports the plurality of heat radiation fins 4473 at the U-shaped inner surface. An extension portion 4471A extending outward is formed at the U-shaped tip portion of the fixing portion 4471, and a screw (not shown) is screwed into the exterior case 2 through the hole 4471A1 of the extension portion 4471A. A radiator 447 is fixed to the outer case 2.

  The tubular member 4472 is made of aluminum and, as shown in FIG. 12B, extends from one U-shaped tip end edge of the fixing portion 4471 toward the other U-shaped tip end edge. The distal end portion in the direction bends approximately 90 ° and extends downward, and the distal end portion in the extending direction bends approximately 90 ° and extends from the other U-shaped distal end edge of the fixing portion 4471 to one U-shaped distal end. It has a substantially U shape in plan view extending toward the edge, and is connected to the fixing portion 4471 and the heat radiating fin 4473 so that heat can be transferred. The tubular member 4472 has a smaller tube diameter than that of the fluid circulation member 448, and the upper end shown in FIG. 12B has a cooling fluid for the relay tank 4404 in the optical device main body 440. It connects with the other end of the fluid circulation member 448 connected with the outflow part 4404B. 12B is connected to the other end of the fluid circulating member 448 connected to the cooling fluid inflow portion 445A of the main tank 445. Therefore, the cooling fluid that has flowed out of the relay tank 4404 passes through the tubular member 4472 via the fluid circulation member 448, and the cooling fluid that passes through the tubular member 4472 flows into the main tank 445 via the fluid circulation member 448.

  The radiating fin 4473 is formed of, for example, a plate body made of a heat conductive member such as metal, and is configured to be able to pass through the tubular member 4472. The plurality of heat radiation fins 4473 are formed so as to extend in a direction orthogonal to the insertion direction of the tubular member 4472, and are arranged in parallel along the insertion direction of the tubular member 4472. In the arrangement state of the plurality of radiating fins 4473, as shown in FIG. 12, the cooling air discharged from the axial fan 32 passes between the plurality of radiating fins 4473.

  As described above, the cooling fluid is supplied from the main tank 445 to the fluid pumping unit 446 to the fluid branching unit 4401 to each light modulation element holder 4402 to the relay tank 4404 to the radiator 447 to the main through the plurality of fluid circulation members 448. It circulates through a flow path called a tank 445.

Next, a cooling structure of the liquid crystal panel 441, the incident side polarizing plate 442, and the emission side polarizing plate 443 will be described.
13 to 15 are diagrams for explaining a cooling structure of the liquid crystal panel 441, the incident side polarizing plate 442, and the emission side polarizing plate 443. FIG. Specifically, FIG. 13 is a plan view of the light modulation element holding body 4402 viewed from the light beam exit side. 14 is a cross-sectional view taken along line DD in FIG. 15 is a cross-sectional view taken along line EE in FIG.
When the fluid pumping unit 446 is driven, the cooling fluid in the main tank 445 is fed into the fluid pumping unit 446 via the fluid circulation member 448 and is also sent from the fluid pumping unit 446 to the fluid branching unit 4401. The

Then, the cooling fluid sent into the fluid branching portion 4401 flows out from each cooling fluid outflow portion 4401C of the fluid branching portion 4401, and through the fluid circulation member 448, as shown in FIGS. The light modulation element holding body 4402 flows into each light modulation element holding body 4402 from each inflow port 4406H.
As shown in FIG. 14 or FIG. 15, the cooling fluid that has flowed into each light modulation element holding body 4402 is divided by the protruding portion 4406C2 of the cylindrical portion 4406C, and flows into the cooling chamber R1 and the cooling chamber R2.
Here, the heat generated in the liquid crystal panel 441, the incident side polarizing plate 442, and the emission side polarizing plate 443 by the light beam emitted from the light source device 411 is transmitted to the cooling fluid in each of the cooling chambers R1 and R2.
As shown in FIG. 14, the heat transferred to the cooling fluid in the cooling chamber R2 proceeds upward in FIG. 14 according to the flow of the cooling fluid, and goes to the outside of the cooling chamber R2 through the outlet 4406I. Moving.
On the other hand, the heat transmitted to the cooling fluid in the cooling chamber R1 moves upward in FIG. 14 according to the flow of the cooling fluid, as shown in FIG. Further, the heat moved upward is guided to the left and right corners by the side wall of the upper concave portion 4405F (FIG. 9B) in the frame-like member 4405 according to the flow of the cooling fluid. . Then, as shown in FIG. 15, the heat guided to the left and right corner portions is divided into two insertion holes 4405D and these insertion holes 4405D located in the left and right corner portions according to the flow of the cooling fluid. It moves into the cooling chamber R2 via the two cylindrical portions 4406D to be connected, is rectified by the rectifying portion 4406F (FIG. 10A), and moves to the outside of the cooling chamber R2 via the outlet 4406I. .

The heat that has moved to the outside of the light modulation element holder 4402 via the outlet 4406I moves to the cooling chambers R1, R2, the relay tank 4404, and the radiator 447 in accordance with the flow of the cooling fluid. When the heated cooling fluid passes through the tubular member 4472 of the radiator 447, the heat of the cooling fluid is transmitted to the tubular member 4472 to the plurality of radiating fins 4473. The heat transmitted to the plurality of heat radiation fins 4473 is cooled by the cooling air discharged from the axial fan 32.
Then, the cooling fluid cooled by the radiator 447 moves from the radiator 447 to the main tank 445 to the fluid pressure feeding unit 446 to the fluid branching unit 4401, and again moves to the cooling chambers R1 and R2.

  Further, the cooling air introduced from the outside of the projector 1 by the sirocco fan 31 of the cooling unit 3 is introduced into the optical component housing 45 through a hole 451C formed in the bottom surface of the optical component housing 45. The The cooling air introduced into the optical component casing 45 flows into the outer surface of the light modulation element holding body 4402 and between the light modulation element holding body 4402 and the support member 4403, and circulates from below to above. . At this time, the cooling air flows while cooling the light incident side end surface of the incident side polarizing plate 442 and the light emitting side end surface of the emission side polarizing plate 443.

In the first embodiment described above, the pair of frame-like members 4405 and 4406 constituting the light modulation element holding body 4402 has cooling chambers R1 and R2 therein, respectively, and the cooling that has flowed in through the inlet 4406H. The fluid is divided into the cooling chambers R1 and R2 through the cylindrical portion 4406C and the insertion hole 4405C, and the cooling fluid in each of the cooling chambers R1 and R2 is merged at the two cylindrical portions 4406D and the insertion hole 4405D. It flows out through 4406I. By connecting the inflow port 4406H and the outflow port 4406I with the plurality of fluid circulation members 448, the cooling fluid in each of the cooling chambers R1 and R2 can be easily convected and heated by the liquid crystal panel 441. The remaining cooling fluid can be prevented from staying in the cooling chambers R1 and R2. Therefore, the cooling fluid is warmed by the liquid crystal panel 441 and the temperature difference between the liquid crystal panel 441 and the cooling fluid is not reduced, and the light modulation element can be efficiently cooled by the cooling fluid.
Here, since the openings 4405A and 4406A are provided in accordance with the image forming area of the liquid crystal panel 441, the cooling fluid filled in the cooling chambers R1 and R2 contacts the image forming area of the liquid crystal panel 441. Thus, the temperature distribution in the image forming area of the liquid crystal panel 441 is made uniform, local overheating is avoided, and a clear optical image can be formed on the liquid crystal panel 441.
In addition, slopes 4405A1 and 4406A1 that reduce the opening area toward the opposing surface are formed on the periphery of the openings 4405A and 4406A. The cooling fluid can be circulated efficiently through the liquid crystal panel 441 disposed on the opposite surface side. Therefore, the liquid crystal panel 441 can be further efficiently cooled by the cooling fluid.

Further, since each of the cooling chambers R1 and R2 is connected in communication by the three cylindrical portions 4406C and 4406D and the three insertion holes 4405C and 4405D, the light flux incident side and the light flux emission side of the liquid crystal panel 441 have substantially the same temperature. The liquid can be cooled by the cooling fluid, and the temperatures on the light incident side and the light emitting side of the liquid crystal panel 441 can be made uniform.
Further, the cooling chambers R1 and R2 are connected to each other through the three cylindrical portions 4406C and 4406D and the three insertion holes 4405C and 4405D, so that the cooling chambers R1 and R2 are connected to each other by, for example, a fluid circulation member. Compared with the configuration, the light modulation element holding body 4402 can be made compact, and the light modulation element holding body 4402 can be reduced in size and weight.

Furthermore, by forming the three cylindrical portions 4406C and 4406D and the three insertion holes 4405C and 4405D, it is not necessary to provide two inlets 4406H and two outlets 4406I in accordance with the cooling chambers R1 and R2. A configuration in which only one inflow port 4406H and outflow port 4406I are provided in the light modulation element holding body 4402 can be employed. This reduces the number of fluid circulation members 448 that connect the inflow port 4406H and the outflow port 4406I as compared to a configuration in which two inflow ports 4406H and outflow ports 4406I are provided for each cooling chamber R1, R2. it can.
Therefore, the connection work of the fluid circulation member 448 to the inlet 4406H and the outlet 4406I can be easily performed. Moreover, the location where the cooling fluid leaks can be reduced by reducing the number of connection locations. Further, the space efficiency around the light modulation element holding body 4402 can be improved. Furthermore, the reaction force of the fluid circulation member 448 to the light modulation element holding body 4402 can be reduced in a state where the fluid circulation member 448 is connected to the light modulation element holding body 4402, and each light modulation element holding body 4402 against the cross dichroic prism 444 can be reduced. Mutual displacement can be avoided and pixel displacement between the liquid crystal panels 441 can be suppressed.
Here, since the communication port for communicating and connecting the cooling chambers R1 and R2 is constituted by the three cylindrical portions 4406C and 4406D and the three insertion holes 4405C and 4405D, the frame-shaped members 4405 and 4406 are assembled. Further, by inserting the cylindrical portions 4406C and 4406D through the insertion holes 4405C and 4405D, the cooling chambers R1 and R2 can be easily connected to each other. Further, for example, the cylindrical members 4405 and 4406 are provided with cylindrical portions substantially similar to the cylindrical portions 4406C and 4406D, respectively, and the cylindrical portions are connected when the frame-shaped members 4405 and 4406 are assembled. Thus, as compared with the configuration in which the communication port is formed, leakage of the cooling fluid flowing through the three cylindrical portions 4406C and 4406D and the three insertion holes 4405C and 4405D can be easily prevented with a simple configuration.

Further, since the outlet 4406I and the inlet 4406H are formed at positions opposed to the upper and lower ends of the frame-like member 4406, the flow direction of the cooling fluid in each cooling chamber R1, R2 can be set in one direction, The cooling fluid can be smoothly circulated in the chambers R1 and R2, and the convection speed of the cooling fluid can be increased. Therefore, the temperature difference between the liquid crystal panel 441 and the cooling fluid in the cooling chambers R1 and R2 can be maintained, and the liquid crystal panel 441 can be cooled more efficiently by the cooling fluid.
Here, since the inflow port 4406H is formed at the lower end portion of the frame-like member 4406 and the outflow port 4406I is formed at the upper end portion of the frame-like member 4406, the heat transfer direction and the cooling fluid convection direction. Can be made in the same direction, so that the warmed cooling fluid can be prevented from staying in the cooling chambers R1 and R2, and the cooling efficiency of the liquid crystal panel 441 can be further improved.

Further, the cylindrical portion 4406C is connected to the inflow port 4406H so that a part of the inner side surface thereof intersects the central axis of the inflow port 4406H, and the protruding portion 4406C2 is formed on a part of the inner side surface. The cooling fluid flowing in from the inlet 4406H can surely flow into both the cooling chambers R1 and R2, and both the light beam incident side and the light beam emission side of the liquid crystal panel 441 can be reliably cooled with the cooling fluid.
Here, for example, when the amount of heat generated on the light incident side and the light emitting side of the liquid crystal panel 441 are different, the protrusion 4406C2 is formed at a predetermined position on a part of the inner surface of the cylindrical portion 4406C, thereby generating heat. A large amount of cooling fluid can be allowed to flow into the side with a large amount, and a small amount of cooling fluid can be allowed to flow into the side with a small amount of heat generation.

  Further, since the rectifying unit 4406F is formed in the vicinity of the outlet 4406I, the cooling fluid that has flowed into the cooling chamber R2 through the inlet 4406H, and the cooling through the two cylindrical parts 4406D and the two insertion holes 4405D. Both cooling fluids that have flowed into the cooling chamber R2 from the chamber R1 can be smoothly circulated toward the outlet 4406I. Therefore, when the cooling fluid once heated in the liquid crystal panel 441 in the cooling chamber R1 flows into the cooling chamber R2, it can be prevented from spreading and flowing into the cooling chamber R2, and the liquid crystal panel 441 and the cooling chamber R1, respectively. The temperature difference from the cooling fluid in R2 is maintained, and the liquid crystal panel 441 can be cooled more efficiently by the cooling fluid.

Since the light modulation element holding body 4402 includes the elastic member 4407, leakage of the cooling fluid from each of the cooling chambers R1 and R2 can be prevented.
Here, the second elastic member 4407B constituting the elastic member 4407 is formed with insertion holes 4407B1 corresponding to the three cylindrical portions 4406C and 4406D in the frame-like member 4406. Therefore, the light modulation element holding body 4402 is provided. When assembled, the second elastic member 4407B is pressed by the frame-like members 4405 and 4406, and the insertion holes 4407B1 in the second elastic member 4407B are connected to the three cylindrical portions 4406C and 4406D and the three insertion holes 4405C. , 4405D. Therefore, leakage of the cooling fluid flowing through the three cylindrical portions 4406C and 4406D and the three insertion holes 4405C and 4405D can be reliably prevented with a simple configuration.

  Further, the three insertion holes 4405C and 4405D and the three cylindrical portions 4406C and 4406D are formed of a light transmitting substrate for the concave portions 4405F and 4406E of the pair of frame-like members 4405 and 4406, the incident side polarizing plate 442, and the emission side polarizing plate 443, respectively. Since the cooling chambers R1 and R2 are connected to each other through a gap formed between 442A and 443A, only three recesses 4405F and 4406E are provided on the outer surfaces of the pair of frame-like members 4405 and 4406, respectively. The cooling chambers R1 and R2 can be easily connected to each other through the holes 4405C and 4405D and the three cylindrical portions 4406C and 4406D. Furthermore, the cooling chambers R1 and R2 are communicated with each other through the three insertion holes 4405C and 4405D and the three cylindrical portions 4406C and 4406D only by providing the recesses 4405F and 4406E on the outer surfaces of the pair of frame-like members 4405 and 4406, respectively. For example, holes that allow the cooling fluid in the cooling chambers R1 and R2 to flow outside the cooling chambers R1 and R2 are formed inside the pair of frame-like members 4405 and 4406, respectively. The pair of frame-shaped members 4405 and 4406 can be easily manufactured as compared with the configuration in which the cooling chambers R1 and R2 are connected to each other through the three insertion holes 4405C and 4405D and the three cylindrical portions 4406C and 4406D.

  Furthermore, since the side walls of the recesses 4405F and 4406E are formed in a curved shape, the cooling fluid in the cooling chambers R1 and R2 can be guided to the two insertion holes 4405D by the side walls, and each of the cooling chambers R1 and R2 can be guided. The cooling fluid can be circulated more smoothly, the convection speed of the cooling fluid can be increased, and the liquid crystal panel 441 can be more efficiently cooled by the cooling fluid.

The optical device main body 440 includes a plurality of fluid circulation members 448, a fluid branching portion 4401, and a relay tank 4404 in addition to the light modulation element holding body 4402, so that not only the cooling chambers R1 and R2 but also a plurality of By enclosing the cooling fluid in the fluid circulation member 448, the fluid branching portion 4401, and the relay tank 4404, the capacity of the cooling fluid can be increased, and the heat exchange capacity between the liquid crystal panel 441 and the cooling fluid is improved. Can be made.
The optical device main body 440 includes an incident-side polarizing plate 442 and an emission-side polarizing plate 443, and the cooling chambers R1 and R2 include the liquid crystal panel 441, the light-transmitting light of the incident-side polarizing plate 442 and the emission-side polarizing plate 443. Are formed by closing the light beam incident side and the light beam emission side of the openings 4405A and 4406A with the conductive substrates 442A and 443A, respectively. The heat generated in the polarizing film 443B of the polarizing plate 443 can also be radiated to the cooling fluid convection through the cooling chambers R1 and R2 via the light-transmitting substrates 442A and 443A, and the incident-side polarizing plate 442 and the emission-side polarizing plate 443 are also efficient. Can be cooled.

Furthermore, since the fluid branching portion 4401 branches and sends out the internal cooling fluid for each of the three light modulation element holding bodies 4402, the temperature of the cooling fluid flowing into the cooling chambers R <b> 1 and R <b> 2 of each light modulation element holding body 4402. The three liquid crystal panels 441 can be cooled with a cooling fluid having substantially the same temperature. Since the fluid branching portion 4401 is attached to the lower surface of the cross dichroic prism 444, the optical device body 440 can be made compact, and the optical device body 440 can be downsized.
Here, in the fluid branching portion 4401, one end of each of the cooling fluid inflow portion 4401A and the cooling fluid outflow portion 4401C protrudes toward the inside, so that only the cooling fluid accumulated in the fluid branching portion 4401 is used. It can be drained to the outside. For example, even when the inside of the fluid branch portion 4401 is not filled with the cooling fluid, only the cooling fluid can flow out to the outside without mixing air. Further, since not only the cooling fluid outflow portion 4401C but also the cooling fluid inflow portion 4401A protrudes inside, when the convection direction of the cooling fluid is changed, that is, the cooling fluid inflow portion 4401A moves the internal cooling fluid to the outside. Even when the cooling fluid is caused to flow out and the cooling fluid flows into the inside at the cooling fluid outflow portion 4401C, only the cooling fluid accumulated inside at the cooling fluid inflow portion 4401A can flow out to the outside. The same applies to the main tank 445 and the relay tank 4404.

Furthermore, the tubular member 4472 in the main tank 445, the fluid pumping portion 446, the plurality of fluid circulation members 448, the fluid branching portion 4401, the pair of frame-like members 4405 and 4406, the relay tank 4404, and the radiator 447 are made of aluminum having corrosion resistance. By being comprised by this, even when it contacts a cooling fluid for a long period, it can prevent producing a chemical reaction. That is, it is possible to avoid coloring of the cooling fluid by a reactive substance due to a chemical reaction, and to prevent the optical characteristics of the light beam passing through the cooling chambers R1 and R2 from being changed.
The projector 1 includes the optical device main body 440 described above, thereby preventing thermal deterioration of the liquid crystal panel 441 and extending the life of the projector 1.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
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, in the optical device main body 440, the inlet 4406 </ b> H and the outlet 4406 </ b> I of the light modulation element holding body 4402 are formed at positions opposed to the upper and lower ends of the frame-shaped member 4406, respectively.
On the other hand, in the second embodiment, in the optical device main body 540, the inflow port 5406H and the outflow port 5406I of the light modulation element holding body 5402 are respectively formed at the upper end portion that is one end portion of the frame-shaped member 5406. Yes. The rest of the configuration excluding the optical device main body 540 is the same as that of the first embodiment.

Specifically, FIGS. 16 and 17 are diagrams illustrating a schematic configuration of the optical device main body 540 according to the second embodiment. FIG. 16 is a perspective view of the optical device main body 540 as viewed from above, and FIG. 17 is a perspective view of the optical device main body 540 as viewed from below.
The optical device main body 540 includes the liquid crystal panel 441, the incident side polarizing plate 442, the emission side polarizing plate 443, the cross dichroic prism 444, the support member 4403, and the relay tank 5404 (FIG. 16) described in the first embodiment. A prism fixing plate 5401 and three light modulation element holders 5402.
The relay tank 5404 has the same configuration as the relay tank 4404 described in the first embodiment, except that the functions of the cooling fluid inflow portion 4404A and the cooling fluid outflow portion 4404B of the relay tank 4404 are reversed. Only. In this relay tank 5404, as shown in FIG. 16, the cooling fluid outflow portion 4404B of the relay tank 4404 functions as a cooling fluid inflow portion 5404A for allowing the cooling fluid to flow into the inside from the outside. In other words, one end protruding outside the cooling fluid inflow portion 5404A is connected to the other end of the fluid circulation member 448 connected to the fluid pressure feeding portion 446 (FIG. 2 or FIG. 3), although a specific illustration is omitted. Then, the cooling fluid pumped from the fluid pumping unit 446 through the fluid circulation member 448 flows into the relay tank 5404.

In addition, as shown in FIG. 16, the relay tank 5404 has three cooling fluid inflow portions 4404A of the relay tank 4404 that branch the internal cooling fluid to the respective light modulation element holders 5402 to flow out. It functions as the fluid outflow portion 5404B. As shown in FIG. 16, one end of each of the three fluid circulation members 448 is connected to one end of the three cooling fluid outflow portions 5404B, and the other end of each fluid circulation member 448 is connected to each light modulation element. The cooling fluid in the relay tank 5404 is branched through these fluid circulation members 448 and flows out to the respective light modulation element holding bodies 5402.
Therefore, the relay tank 5404 in the second embodiment corresponds to a fluid branching portion according to the present invention.

  The prism fixing plate 5401 has substantially the same shape as the fluid branch portion 4401 described in the first embodiment, and has only a function of supporting the cross dichroic prism 444. That is, in the prism fixing plate 5401, the cooling fluid inflow portion 4401A and the cooling fluid outflow portion 4401C of the fluid branching portion 4401 described in the first embodiment are omitted, and the arm portion 4401B (hole 4401B1 of the fluid branching portion 4401 is omitted). And an bulging portion (not shown) and an arm portion 5401B (including the hole 5401B1) similar to the bulging portion 4401D.

FIG. 18 is an exploded perspective view showing a schematic configuration of the light modulation element holding body 5402.
The three light modulation element holders 5402 are substantially the same as the light modulation element holder 4402 described in the first embodiment, with three liquid crystal panels 441, three incident side polarizing plates 442, and three emission side polarizing plates. Each of the liquid crystal panels 441, the three incident side polarizing plates 442, and the three outgoing side polarizing plates 443 is cooled by the cooling fluid. Each light modulation element holder 5402 has the same configuration, and only one light modulation element holder 5402 will be described below. As shown in FIG. 18, the light modulation element holder 5402 includes a pair of polarizing plate fixing members 4408A and 4408B described in the first embodiment, a pair of frame-like members 5405 and 5406, and four elastic members. 5407 and an intermediate frame 5409 are provided.

FIG. 19 is a diagram illustrating a schematic configuration of the frame-shaped member 5405. Specifically, FIG. 19A is a perspective view of the frame-shaped member 5405 as viewed from the light beam emission side. FIG. 19B is a perspective view of the frame-shaped member 5405 as viewed from the light beam incident side.
The frame-shaped member 5405 is disposed on the light beam incident side with respect to the frame-shaped member 5406, supports the light beam incident side of the liquid crystal panel 441, and supports the light beam emission side of the incident-side polarizing plate 442. The general structure is substantially the same as the frame-like member 4405 described in the first embodiment. That is, the frame-shaped member 5405 includes the opening 4405A (including the slope 4405A1), the recesses 4405B, 4405E, 4405F, the insertion holes 4405C, 4405D, the connection 4405G, and the frame-shaped member 4405 described in the first embodiment. It has an opening 5405A (including a slope 5405A1), recesses 5405B, 5405E, 5405F, insertion holes 5405C, 5405D, a connection 5405G, and a hook 5405H, which are substantially the same as the hook 4405H.
Among these, two insertion holes 5405 </ b> C and 5405 </ b> D are formed corresponding to two cylindrical portions of the frame-like member 5406 described later. That is, one insertion hole 4405D of the two insertion holes 4405D described in the first embodiment is omitted.
In addition, the recess 5405F is formed on the periphery of the upper and lower end portions of the opening 5405A so as to be connected to the two insertion holes 5405C and 5405D. Here, of these concave portions 5405F, the upper side wall of the concave portion 5405F located on the upper side is formed in a curved shape so as to be closer to the opening portion 5405A as the distance from the insertion hole 5405D increases.

  In the configuration as described above, the frame-like member 5405 has a second elastic member (to be described later) of the elastic member 5407 and an intermediate frame 5409 at the concave portion 5405B, similarly to the frame-like member 4405 described in the first embodiment. By supporting the light beam incident side end surface of the liquid crystal panel 441, the light beam emission side of the opening 5405A is closed. Further, by fixing the polarizing plate fixing member 4408A to the frame-shaped member 5405, the incident-side polarizing plate 442 is pressed by the frame-shaped member 5405 via a first elastic member described later of the elastic member 5407, and the frame-shaped member. The light beam incident side of the opening 5405A of 5405 is sealed. Then, the light incident side and the light exit side of the opening 5405A of the frame-shaped member 5405 are closed, so that the frame-shaped member 5405 is filled inside (the opening 5405A and the gap between the recess 5405F and the incident-side polarizing plate 442). A cooling chamber R3 (see FIG. 22 or FIG. 23) capable of enclosing the cooling fluid is formed.

FIG. 20 is a diagram showing a schematic configuration of the frame-like member 5406. As shown in FIG. Specifically, FIG. 20A is a perspective view of the frame-shaped member 5406 as viewed from the light beam emission side. FIG. 20B is a perspective view of the frame-shaped member 5406 as viewed from the light beam incident side.
The frame-shaped member 5406 sandwiches the liquid crystal panel 441 between the frame-shaped member 5405 and the above-described frame-shaped member 5405 via the elastic member 5407 and the intermediate frame 5409, and on the surface opposite to the surface facing the frame-shaped member 5405. The emission-side polarizing plate 443 is supported via the elastic member 5407, and the specific structure thereof is substantially the same as the frame-like member 4406 described in the first embodiment. That is, the frame-shaped member 5406 includes the opening 4406A (including the inclined surface 4406A1), the recesses 4406B, 4406E, 4406G, and the cylindrical portions 4406C, 4406D (holes 4406C1, 4406D1) of the frame-shaped member 4406 described in the first embodiment. ), An opening 5406A (including a slope 5406A1), recesses 5406B, 5406E and 5406G, and cylindrical portions 5406C and 5406D (including holes 5406C1 and 5406D1), which are substantially similar to the insertion portion 4406J, the connection portion 4406K, and the hook 4406L. ), An insertion portion 5406J, a connection portion 5406K, and a hook 5406L.

Among these, as shown in FIG. 20, the cylindrical portions 5406C and 5406D are formed at one of the upper corner portions (the left corner portion as viewed from the light beam exit side) of the recess 5406B and the substantially horizontal center on the lower side. Each part is formed. That is, the frame-shaped member 5406 has a configuration in which one of the two cylindrical portions 4406D in the frame-shaped member 4406 described in the first embodiment is omitted. In a state where the frame-shaped member 5406 and the frame-shaped member 5405 are combined, the two cylindrical portions 5406C and 5406D in the frame-shaped member 5406 are inserted into the two insertion holes 5405C and 5405D in the frame-shaped member 5405, respectively. The cooling fluid can circulate through the holes 5406C1 and 5406D1 of the cylindrical portions 5406C and 5406D and the two insertion holes 5405C and 5405D on the light emission side of the cylindrical member 5406 and the light incident side of the frame-like member 5405.
That is, the two insertion holes 5405C and 5405D in the frame-shaped member 5405 and the two cylindrical portions 5406C and 5406D in the frame-shaped member 5406 correspond to the communication port according to the present invention. Further, the insertion hole 5405C and the cylindrical portion 5406C correspond to the first communication port according to the present invention, and the insertion hole 5405D and the cylindrical portion 5406D correspond to the second communication port according to the present invention.
The cylindrical portion 5406C has a shape corresponding to the cylindrical portion 4406C described in the first embodiment, but the protruding portion 4406C2 of the cylindrical portion 4406C is formed in the cylindrical portion 5406C. Shall not.

  Further, as shown in FIG. 20, in the frame-like member 5406, at the upper side end portion, a concave portion 5406E located on the upper side at a position shifted to the right side from the substantially central portion in the left-right direction when viewed from the light beam exit side. An inflow port 5406H penetrating the side wall on the upper side is formed. This inflow port 5406H has the same shape as the inflow port 4406H of the first embodiment, and is connected to the cooling fluid outflow portion 5404B of the relay tank 5404 at the end protruding to the outside of the frame-shaped member 5406. The other end of the fluid circulation member 448 is connected, and the cooling fluid that has flowed out of the relay tank 5404 via the fluid circulation member 448 flows into the interior (a cooling chamber R4 described later).

Further, in this frame-like member 5406, at the upper end thereof, as shown in FIG. 20, a concave portion 5406E located on the upper side is located at a position shifted to the left side from the substantially central portion in the left-right direction when viewed from the light beam exit side. An outlet 5406I penetrating the side wall on the upper side is formed. The inflow port 5406H and the outflow port 5406I are disposed substantially symmetrically about the substantially central portion in the left-right direction. The outlet 5406I has the same shape as the outlet 4406I of the first embodiment, and a tubular portion of the radiator 447 is not shown at the end protruding outside the frame-like member 5406, although the illustration is omitted. The other end of the fluid circulation member connected to one upper end of the member 4472 (FIG. 12) is connected, and the cooling fluid inside (region R4B described later) is sent to the radiator 447 via the fluid circulation member. .
Although not specifically shown, the fluid circulation member is composed of a tubular member whose other end is branched into three, and each other end is connected to each outlet 5406I of three light modulation element holding bodies 5402. It is assumed that the cooling fluids that have been connected to each other and have flowed out from the three light modulation element holders 5402 are collectively delivered to the radiator 447.

Furthermore, in this frame-like member 5406, a recess 5406E located on the upper side has a partition wall that surrounds a portion where the outlet 5406I communicates with the side wall of the recess 5406E and the hole 5406D1, as shown in FIG. 5406N is erected.
In the configuration as described above, the screws 5406M (FIG. 18) are screwed into the connection portions 5405G and 5406K of the frame-like members 5405 and 5406, similarly to the light modulation element holding body 4402 described in the first embodiment. Thus, the liquid crystal panel 441 is pressed against the frame-shaped member 5405 via a second elastic member, which will be described later, of the intermediate frame 5409 and the elastic member 5407, and a third elastic member, which will be described later, of the intermediate frame 5409 and the elastic member 5407. The frame-shaped member 5406 is pressed to seal the light beam exit side of the opening 5405A of the frame-shaped member 5405 and the light beam incident side of the opening 5406A of the frame-shaped member 5406. Further, by fixing the polarizing plate fixing member 4408B to the frame-shaped member 5406, the emission-side polarizing plate 443 is pressed by the frame-shaped member 5406 via a fourth elastic member described later of the elastic member 5407, and the frame-shaped member. The light exit side of the opening 5406A of 5406 is sealed. When the light beam incident side and the light beam emission side of the opening 5406A of the frame-shaped member 5406 are closed, the cooling is performed inside the frame-shaped member 5406 (in the opening 5406A and the gap between the concave portion 5406E and the emission-side polarizing plate 443). A cooling chamber R4 (see FIG. 22 or FIG. 23) capable of enclosing a fluid is formed. At this time, the cooling chamber R4 has a region R4A (see FIG. 22 or FIG. 23) in which the inlet 5406H and the hole 5406C1 of the cylindrical portion 5406C communicate with each other by the partition wall 5406N, and an outlet 5406I and a hole 5406D1 of the cylindrical portion 5406D. It is partitioned into a communication region R4B (see FIG. 22 or FIG. 23).

The four elastic members 5407 include a second elastic member 5407B in addition to the first elastic member 4407A, the third elastic member 4407C, and the fourth elastic member 4407D described in the first embodiment. As the material of these elastic members 5407, as with the elastic member 4407 described in the first embodiment, silicon rubber, butyl rubber having a low moisture permeation amount, fluorine rubber, or the like can be employed.
The second elastic member 5407B has substantially the same shape as the second elastic member 4407B described in the first embodiment, and the difference is that it corresponds to the two cylindrical portions 5406C and 5406D of the frame-like member 5406. It is only a point where two insertion holes 5407B1 are formed.
Similarly, the intermediate frame 5409 has substantially the same shape as the intermediate frame 4409 described in the first embodiment, and the difference is that it corresponds to the two cylindrical portions 5406C and 5406D of the frame-shaped member 5406. The only difference is that two insertion holes 5409D are formed. That is, as shown in FIG. 18, the intermediate frame 5409 includes an opening 5409A and a step 5409B (gap 5409C) similar to the opening 4409A and the step 4409B (including the gap 4409C) of the intermediate frame 4409. (See FIG. 22 or FIG. 23).

  As described above, the cooling fluid passes through the plurality of fluid circulation members 448, and the main tank 445 (FIG. 4), the fluid pumping unit 446 (FIG. 3), the relay tank 5404 (FIG. 16), and each light modulation element holding. It circulates through the flow path of the body 5402 (FIG. 16 or FIG. 17) to the radiator 447 (FIG. 12) to the main tank 445 (FIG. 4).

Next, a cooling structure of the liquid crystal panel 441, the incident side polarizing plate 442, and the emission side polarizing plate 443 will be described.
21 to 23 are diagrams for explaining a cooling structure of the liquid crystal panel 441, the incident side polarizing plate 442, and the emission side polarizing plate 443. FIG. Specifically, FIG. 21 is a plan view of the light modulation element holder 5402 as viewed from the light beam exit side. 22 is a cross-sectional view taken along line FF in FIG. 23 is a cross-sectional view taken along line GG in FIG.
When the fluid pumping unit 446 is driven, the cooling fluid in the main tank 445 is fed into the fluid pumping unit 446 via the fluid circulation member 448 and is sent from the fluid pumping unit 446 to the relay tank 5404. .

Then, the cooling fluid sent into the relay tank 5404 flows out from each cooling fluid outflow portion 5404B of the relay tank 5404, and each light modulation is performed via the fluid circulation member 448 as shown in FIG. 21 or FIG. The light flows into each region R4A (FIG. 22 or FIG. 23) of each cooling chamber R4 of each light modulation element holding body 5402 from each inflow port 5406H of the element holding body 5402.
Here, the heat generated in the drive substrate 441C of the liquid crystal panel 441 and the emission-side polarizing plate 443 by the light emitted from the light source device 411 is transmitted to the cooling fluid in the region R4A of the cooling chamber R4.
The heat transferred to the cooling fluid in the region R4A of the cooling chamber R4 moves downward in FIG. 22 according to the flow of the cooling fluid, as shown in FIG. Further, the heat moved downward is guided to a substantially central portion in the left-right direction by the lower side wall of the lower recess 5406E (FIG. 20A) in the frame-like member 5406 according to the flow of the cooling fluid. Is done. Then, the heat guided to the substantially central portion in the left-right direction is cooled through the cylindrical portion 5406C and the insertion hole 5405C connected to the cylindrical portion 5406C in accordance with the flow of the cooling fluid, as shown in FIG. Move into chamber R3.

Here, the heat generated in the counter substrate 441D of the liquid crystal panel 441 and the incident-side polarizing plate 442 by the light beam emitted from the light source device 411 is transmitted to the cooling fluid in the cooling chamber R3.
As shown in FIG. 22, the heat transferred to the cooling fluid in the cooling chamber R3 moves upward in FIG. 22 along with the flow of the cooling fluid together with the heat moved from inside the cooling chamber R4. Further, the heat that has moved upward is caused by the side wall of the upper concave portion 5405F (FIG. 19B) in the frame-shaped member 5405 according to the flow of the cooling fluid to one of the upper corner portions (on the light incident side). To the right corner). As shown in FIG. 23, the heat guided to one of the upper corner portions is cooled through the insertion hole 5405D and the cylindrical portion 5406D connected to the insertion hole 5405D according to the flow of the cooling fluid. It moves into area | region R4B of chamber R4, and moves outside from the inside of area | region R4B through the outflow port 5406I.

The heat transferred to the outside of the light modulation element holding body 5402 via the outlet 5406I moves to each light modulation element holding body 5402 to the radiator 447 via a fluid circulation member (not shown) according to the flow of the cooling fluid. As in the first embodiment, heat is radiated by the radiator 447.
Then, the cooling fluid cooled by the radiator 447 moves from the radiator 447 to the main tank 445 to the fluid pressure sending unit 446 to the relay tank 5404, and again moves to the region R4A of the cooling chamber R4.
Further, the sirocco fan 31 of the cooling unit 3 causes cooling air to flow between the outer surface of the light modulation element holding body 5402 and between the light modulation element holding body 5402 and the support member 4403, as in the first embodiment. The light incident side end face of the incident side polarizing plate 442 and the light emitting side end face of the emission side polarizing plate 443 are cooled.

In the second embodiment described above, the inflow port 5406H and the outflow port 5406I are formed at the upper end portions of the frame-shaped member 5406, respectively, as compared with the first embodiment, and therefore the inflow port 5406H and the outflow port 5406I. The connection work of the fluid circulation member 448 can be concentrated in one direction from the upper direction, and the connection work can be more easily performed.
Further, the cylindrical portion 5406C and the insertion hole 5405C flow into the region R4A of the cooling chamber R4 through the inflow port 5406H, and the cooling fluid that flows from the upper side to the lower side in the region R4A flows into the cooling chamber R3. The cylindrical portion 5406D and the insertion hole 5405C allow the cooling fluid flowing from the lower side to the upper side in the cooling chamber R3 to flow into the region R4B of the cooling chamber R4 and to the outside through the outlet 5406I. Since it flows out, even if the inflow port 5406H and the outflow port 5406I are each formed in the upper end part in the frame-shaped member 5406, a cooling fluid can be reliably distribute | circulated through both cooling chamber R3, R4.
Here, the communication port connecting the cooling chambers R3 and R4 is constituted by two cylindrical portions 5406C and 5406D and two insertion holes 5405C and 5405D, so that the communication port described in the first embodiment can be obtained. Compared with the configuration having three cylindrical portions 4406C and 4406D and three insertion holes 4405C and 4405D, the workability of the pair of frame-shaped members 5405 and 5406 can be improved and easily manufactured, and the manufacturing cost can be reduced. I can plan. The same applies to the second elastic member 5407B and the intermediate frame 5409.

  Further, in the frame-like member 5406, since the partition wall 5406N is erected in the concave portion 5406E located on the upper side, the inside of the cooling chamber R4 can be partitioned into the region R4A and the region R4B by the partition wall 5406N. Therefore, the cooling fluid that has flowed into the cooling chamber R4 via the cylindrical portion 5406D and the insertion hole 5405D can be confined within the region R4B and flowed out to the outside via the outlet 5406I. For this reason, when the cooling fluid heated by the liquid crystal panel 441 in the cooling chamber R3 flows into the cooling chamber R4, it can be prevented from flowing into the region R4A of the cooling chamber R4, and the liquid crystal panel 441 and the cooling chamber R3 can be avoided. The temperature difference from the cooling fluid in R4 is not reduced, and the liquid crystal panel 441 can be cooled more efficiently by the cooling fluid.

[Third embodiment]
Next, 3rd Embodiment of this invention is described based on drawing.
In the following description, the same structures and the same members as those in the first embodiment and the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
In the first embodiment, in the optical device main body 440, the inlet 4406 </ b> H and the outlet 4406 </ b> I of the light modulation element holding body 4402 are formed at positions opposed to the upper and lower ends of the frame-shaped member 4406, respectively.
On the other hand, in the third embodiment, in the optical device main body 640, the inlet 6406H and the outlet 6405I of the light modulation element holding body 6402 are provided at the upper end of the frame member 6406 and the upper end of the frame member 6405, respectively. Is formed. The rest of the configuration excluding the optical device main body 640 is the same as that of the first embodiment.

Specifically, FIG. 24 is a perspective view illustrating a schematic configuration of the optical device main body 640 according to the third embodiment.
The optical device main body 640 includes the liquid crystal panel 441, the incident side polarizing plate 442, the emission side polarizing plate 443, the cross dichroic prism 444, and the support member 4403 described in the first embodiment, and the relay tank described in the second embodiment. In addition to 5404 and prism fixing plate 5401, three light modulation element holding bodies 6402 are provided.

FIG. 25 is an exploded perspective view showing a schematic configuration of the light modulation element holding body 6402.
The three light modulation element holders 6402 are substantially the same as the light modulation element holder 4402 described in the first embodiment, with three liquid crystal panels 441, three incident side polarizing plates 442, and three emission side polarizing plates. Each of the liquid crystal panels 441, the three incident side polarizing plates 442, and the three outgoing side polarizing plates 443 is cooled by the cooling fluid. Each light modulation element holding body 6402 has the same configuration, and only one light modulation element holding body 6402 will be described below. As shown in FIG. 25, this light modulation element holding body 6402 includes a pair of polarizing plate fixing members 4408A and 4408B described in the first embodiment, a pair of frame-like members 6405 and 6406, and four elastic members. 6407 and an intermediate frame 6409 are provided.

FIG. 26 is a diagram illustrating a schematic configuration of the frame-shaped member 6405. Specifically, FIG. 26A is a perspective view of the frame-shaped member 6405 as seen from the light emission side. FIG. 26B is a perspective view of the frame member 6405 as viewed from the light beam incident side.
The frame-shaped member 6405 is disposed on the light beam incident side with respect to the frame-shaped member 6406, supports the light beam incident side of the liquid crystal panel 441, and supports the light beam emission side of the incident-side polarizing plate 442. The general structure is substantially the same as the frame-like member 4405 described in the first embodiment. That is, the frame-shaped member 6405 includes the opening 4405A (including the inclined surface 4405A1), the recesses 4405B, 4405E, and 4405F, the insertion hole 4405C, the connection portion 4405G, and the hook 4405H of the frame-shaped member 4405 described in the first embodiment. And having an opening 6405A (including a slope 6405A1), recesses 6405B, 6405E, 6405F, an insertion hole 6405C, a connection 6405G, and a hook 6405H.
Among these, only one insertion hole 6405 </ b> C is formed corresponding to one cylindrical portion described later of the frame-shaped member 6406. That is, the two insertion holes 4405D described in the first embodiment are omitted.
Further, the concave portion 6405F located on the upper side is formed in a curved surface in which a substantially central portion in the left-right direction is recessed toward the light beam exit side. Further, the upper side wall of the recess 6405F is formed in a curved shape in which a substantially central portion in the left-right direction is recessed upward.

In addition, in the frame-like member 6405, an outlet 6405I penetrating through the upper side wall of the concave portion 6405F located on the upper side is formed at the substantially central portion of the upper end portion thereof as shown in FIG. . The outlet 6405I has the same shape as the outlet 4406I of the first embodiment. In addition, the outlet 6405I is similar to the outlet 5406I of the second embodiment, but the tubular member 4472 in the radiator 447 is not illustrated at the end protruding outside the frame-shaped member 6405. The other end of the fluid circulation member connected to one upper end of FIG. 12 is connected, and the cooling fluid inside (cooling chamber R5 described later) is sent to the radiator 447 through the fluid circulation member.
The fluid circulation member is formed of a tubular member having the other end branched into three, similar to the fluid circulation member described in the second embodiment, and each other end has three light modulation element holders 6402. It is assumed that the cooling fluid flowing out from the three light modulation element holders 6402 is collectively sent to the radiator 447.

  In the configuration as described above, the frame-shaped member 6405 is similar to the frame-shaped member 4405 described in the first embodiment via the second elastic member and the intermediate frame 6409 described later of the elastic member 6407 in the recess 6405B. By supporting the light beam incident side end surface of the liquid crystal panel 441, the light beam emission side of the opening 6405A is closed. Further, by fixing the polarizing plate fixing member 4408A to the frame-shaped member 6405, the incident-side polarizing plate 442 is pressed against the frame-shaped member 6405 via a first elastic member described later of the elastic member 6407, and the frame-shaped member. The light beam incident side of the opening 6405A of 6405 is sealed. Then, the light incident side and the light exit side of the opening 6405A of the frame-shaped member 6405 are closed, so that the frame-shaped member 6405 is filled inside (the opening 6405A and the gap between the concave portion 6405F and the incident-side polarizing plate 442). A cooling chamber R5 (see FIG. 29) capable of enclosing the cooling fluid is formed.

FIG. 27 is a diagram showing a schematic configuration of the frame-like member 6406. As shown in FIG. Specifically, FIG. 27A is a perspective view of the frame-shaped member 6406 as viewed from the light beam emission side. FIG. 27B is a perspective view of the frame-shaped member 6406 as viewed from the light beam incident side.
The frame-shaped member 6406 holds the liquid crystal panel 441 between the frame-shaped member 6405 and the above-described frame-shaped member 6405 via the elastic member 6407 and the intermediate frame 6409, and on the surface opposite to the surface facing the frame-shaped member 6405. The emission-side polarizing plate 443 is supported via the elastic member 6407, and the specific structure is substantially the same as the frame-shaped member 4406 described in the first embodiment. That is, the frame-shaped member 6406 includes the opening 4406A (including the slope 4406A1), the recesses 4406B, 4406E, and 4406G, the cylindrical portion 4406C (including the hole 4406C1) of the frame-shaped member 4406 described in the first embodiment, Opening 6406A (including slope 6406A1), recesses 6406B, 6406E, 6406G, cylindrical portion 6406C (including hole 6406C1), insertion portion 6406J, and connection portion 6406K, similar to insertion portion 4406J, connection portion 4406K, and hook 4406L. , And a hook 6406L.

Among these, as shown in FIG. 27, the cylindrical portion 6406C is formed in the substantially central portion of the lower side of the concave portion 6406B in the left-right direction. That is, the frame-shaped member 6406 has a configuration in which the two cylindrical portions 4406D in the frame-shaped member 4406 described in the first embodiment are omitted. In a state where the frame-shaped member 6406 and the frame-shaped member 6405 are combined, the cylindrical portion 6406C of the frame-shaped member 6406 is inserted into the insertion hole 6405C of the frame-shaped member 6405, and the light emission side of the frame-shaped member 6406 and the frame The cooling fluid can flow through the hole 6406C1 of the cylindrical portion 6406C and the insertion hole 6405C on the light beam incident side of the cylindrical member 6405.
That is, the insertion hole 6405C in the frame-shaped member 6405 and the cylindrical portion 6406C in the frame-shaped member 6406 correspond to the communication port according to the present invention.
The cylindrical portion 6406C has a shape corresponding to the cylindrical portion 4406C described in the first embodiment, but the protruding portion 4406C2 of the cylindrical portion 4406C is formed in the cylindrical portion 6406C. Shall not.
In addition, as shown in FIG. 27A, the concave portion 6406E positioned on the upper side is formed in a curved surface so that the substantially central portion in the left-right direction is recessed toward the light beam incident side. In addition, the upper side wall of the recess 6406E is formed in a curved shape so that the substantially central portion in the left-right direction is recessed upward.

  In addition, in the frame-like member 6406, an inflow port 6406H penetrating the upper side wall of the concave portion 6406E located on the upper side is formed at the upper end substantially central portion thereof as shown in FIG. . The inlet 6406H has the same shape as the inlet 4406H of the first embodiment. The inflow port 6406H, like the inflow port 5406H of the second embodiment, is connected to the cooling fluid outflow portion 5404B of the relay tank 5404 at the end protruding to the outside of the frame-like member 6406. The other end of the member 448 is connected, and the cooling fluid that has flowed out of the relay tank 5404 via the fluid circulation member 448 flows into the inside (cooling chamber R6 described later).

  In the configuration as described above, the screws 6406M (FIG. 25) are screwed into the connection portions 6405G and 6406K of the frame-like members 6405 and 6406, similarly to the light modulation element holding body 4402 described in the first embodiment. Thus, the liquid crystal panel 441 is pressed against the frame-shaped member 6405 via a second elastic member described later of the intermediate frame 6409 and the elastic member 6407, and a third elastic member described later of the intermediate frame 6409 and the elastic member 6407 is provided. The frame-shaped member 6406 is pressed to seal the light beam exit side of the opening 6405A of the frame-shaped member 6405 and the light beam incident side of the opening 6406A of the frame-shaped member 6406. Further, by fixing the polarizing plate fixing member 4408B to the frame-shaped member 6406, the emission-side polarizing plate 443 is pressed against the frame-shaped member 6406 via a fourth elastic member described later of the elastic member 6407, and the frame-shaped member. The light exit side of the opening 6406A of 6406 is sealed. Then, the light entrance side and the light exit side of the opening 6406A of the frame-like member 6406 are closed, so that the inside of the frame-like member 6406 (in the opening 6406A and the gap between the recess 6406E and the exit-side polarizing plate 443). A cooling chamber R6 (see FIG. 29) capable of enclosing the cooling fluid is formed.

The four elastic members 6407 include a second elastic member 6407B in addition to the first elastic member 4407A, the third elastic member 4407C, and the fourth elastic member 4407D described in the first embodiment. As the material of the elastic member 6407, silicon rubber, butyl rubber or fluorine rubber having a small amount of moisture permeation, etc. can be adopted as in the elastic member 4407 described in the first embodiment.
The second elastic member 6407B has substantially the same shape as the second elastic member 4407B described in the first embodiment, except that only one corresponding to the cylindrical portion 6406C of the frame-shaped member 6406 is provided. This is only the point where the insertion hole 6407B1 is formed.
Similarly, the intermediate frame 6409 has substantially the same shape as the intermediate frame 4409 described in the first embodiment, and is different from the intermediate frame 6409 in that there is only one corresponding to the cylindrical portion 6406C of the frame-shaped member 6406. This is only the point where the insertion hole 6409D is formed. That is, as shown in FIG. 25, the intermediate frame 6409 has an opening 6409A and a step 6409B (gap 6409C) similar to the opening 4409A and the step 4409B (including the gap 4409C) of the intermediate frame 4409. (Refer to FIG. 29).

  As described above, the cooling fluid is supplied from the main tank 445 (FIG. 4) to the fluid pumping unit 446 (FIG. 3) to the relay tank 5404 via the plurality of fluid circulation members 448 in substantially the same manner as in the second embodiment. Each light modulation element holding body 6402 (FIG. 24), radiator 447 (FIG. 12), main tank 445 (FIG. 4) is circulated.

Next, a cooling structure of the liquid crystal panel 441, the incident side polarizing plate 442, and the emission side polarizing plate 443 will be described.
28 and 29 are diagrams for explaining a cooling structure of the liquid crystal panel 441, the incident side polarizing plate 442, and the emission side polarizing plate 443. FIG. Specifically, FIG. 28 is a plan view of the light modulation element holding body 6402 viewed from the light beam exit side. 29 is a cross-sectional view taken along line HH in FIG.
When the fluid pumping unit 446 is driven, the cooling fluid in the main tank 445 is fed into the relay tank 5404 via the fluid circulation member 448 as in the second embodiment.

Then, the cooling fluid sent into the relay tank 5404 flows out from each cooling fluid outflow portion 5404B of the relay tank 5404, and passes through the fluid circulation member 448, as shown in FIG. 28 or FIG. It flows into each cooling chamber R6 (FIG. 29) of each light modulation element holding body 6402 from each inflow port 6406H of the element holding body 6402.
Here, the heat generated in the drive substrate 441C of the liquid crystal panel 441 and the emission-side polarizing plate 443 by the light emitted from the light source device 411 is transmitted to the cooling fluid in the cooling chamber R6.
As shown in FIG. 29, the heat transferred to the cooling fluid in the cooling chamber R6 moves downward in FIG. 29 according to the flow of the cooling fluid. Further, the heat that has moved downward is guided to the substantially central portion in the left-right direction by the side wall of the recess 6406E on the lower side of the frame-shaped member 6406 (FIG. 27A) according to the flow of the cooling fluid. Then, as shown in FIG. 29, the heat guided to the substantially central portion in the left-right direction is cooled through the cylindrical portion 6406C and the insertion hole 6405C connected to the cylindrical portion 6406C according to the flow of the cooling fluid. Move into chamber R5.

Here, the heat generated in the counter substrate 441D of the liquid crystal panel 441 and the incident-side polarizing plate 442 by the light beam emitted from the light source device 411 is transmitted to the cooling fluid in the cooling chamber R5.
As shown in FIG. 29, the heat transferred to the cooling fluid in the cooling chamber R5 moves upward in FIG. 29 along with the flow of the cooling fluid together with the heat moved from the cooling chamber R6. Further, the heat moved upward is guided to the substantially central portion in the left-right direction by the side wall of the upper concave portion 6405F (FIG. 26B) in the frame-shaped member 6405 according to the flow of the cooling fluid. Then, as shown in FIG. 29, the heat guided to the substantially central portion in the left-right direction moves to the outside through the outlet 6405I according to the flow of the cooling fluid.

The heat transferred to the outside of the light modulation element holding body 6402 via the outflow port 6405I is held by each light modulation element via a fluid circulation member (not shown) according to the flow of the cooling fluid as in the second embodiment. It moves from the body 6402 to the radiator 447 and is radiated by the radiator 447.
Then, the cooling fluid cooled by the radiator 447 moves from the radiator 447 to the main tank 445 to the fluid pressure feeding unit 446 to the relay tank 5404, and again moves to the cooling chamber R6.
Further, the sirocco fan 31 of the cooling unit 3 causes cooling air to flow between the outer surface of the light modulation element holding body 6402 and between the light modulation element holding body 6402 and the support member 4403, as in the first embodiment. The light incident side end surface of the incident side polarizing plate 442 and the light emitting side end surface of the emission side polarizing plate 443 are cooled.

In the third embodiment described above, the inflow port 6406H is formed in the frame-shaped member 6406 and the outflow port 6405I is formed in the frame-shaped member 6405, compared with the first embodiment, and thus each cooling chamber R5. , R6 are connected to each other as a communication port by forming only one cylindrical portion 6406C and an insertion hole 6405C, so that the cooling fluid flowing into the cooling chamber R6 through the inlet 6406H is supplied to the cylindrical portion 6406C and It can flow into the cooling chamber R5 through the insertion hole 6405C and flow out to the outside through the outflow port 6405I. Therefore, the cooling fluid can be easily circulated from the cooling chamber R6 to the cooling chamber R5 in both the cooling chambers R5 and R6. In particular, the symmetry and uniformity of the flow of the cooling fluid is enhanced, which is effective for uniform cooling of the liquid crystal panel 441.
Here, the communication port connecting the cooling chambers R5 and R6 is constituted by one cylindrical portion 6406C and an insertion hole 6405C, so that the communication port described in the first embodiment is provided with three cylindrical portions. Compared with the configuration of 4406C and 4406D and three insertion holes 4405C and 4405D, the workability of the pair of frame-like members 6405 and 6406 is dramatically improved, and the manufacturing can be more easily performed, and the manufacturing cost can be reduced. Can be further improved. The same applies to the second elastic member 6407B and the intermediate frame 6409. With such a configuration, the light modulation element holding body 6402 can be reduced in size and weight.
In addition, since the inlet 6406H and the outlet 6405I are formed at the upper ends of the frame-shaped members 6406 and 6405, respectively, the connection work of the fluid circulation member 448 to the inlet 6406H and the outlet 6405I is performed from the upper direction. It is possible to aggregate in the direction, and the connection work can be performed more easily.

[Fourth embodiment]
Next, 4th Embodiment of this invention is described based on drawing.
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, in the optical device 44, the flow rates of the cooling fluid branched by the fluid branching portion 4401 and flowing into the three light modulation element holding bodies 4402 are set to be substantially the same.
On the other hand, in the fourth embodiment, the optical device 44 includes a flow rate changing unit 449 that can change the flow rate of the cooling fluid flowing into each light modulation element holding body 4402. Other configurations are the same as those in the first embodiment.

Specifically, FIG. 30 is a diagram illustrating a structure and an installation position of the flow rate changing unit 449 in the fourth embodiment. Specifically, FIG. 30 is a plan view of the fluid branch portion 4401 viewed from above.
As shown in FIG. 30, the flow rate changing unit 449 is provided in each cooling fluid outflow unit 4401C of the fluid branching unit 4401, and the flow rate of the cooling fluid sent to each light modulation element holder 4402 from each cooling fluid outflow unit 4401C. The flow rate can be changed. As shown in FIG. 30, the flow rate changing unit 449 includes a flow rate changing unit main body 449A and a flow rate adjusting unit 449B.
The flow rate changing unit main body 449A has a flow path through which the cooling fluid can flow, and pivotally supports the flow rate adjusting unit 449B.
Although not specifically shown, the flow rate adjusting unit 449B includes an adjustment valve disposed in the flow rate changing unit main body 449A and an adjusting screw protruding outside the flow rate changing unit main body 449A.
Among these, the said adjustment valve makes it possible to change the flow volume of the cooling fluid which passes a flow path by narrowing or expanding the flow path in the flow volume changing part main body 449A according to the rotation position. The adjustment valve is capable of changing the flow rate of the cooling fluid passing through the flow path of the flow rate changing unit main body 449A by manually rotating the adjustment screw in conjunction with the movement of the adjustment screw.

  In the above-described fourth embodiment, by operating the flow rate adjustment unit 449B of the flow rate change unit 449, the liquid crystal panel 441 having a larger calorific value among the three liquid crystal panels 441 is compared with the first embodiment. On the other hand, by increasing the flow rate of the cooling fluid and decreasing the flow rate of the cooling fluid with respect to the liquid crystal panel 441 having a small heat generation amount, the temperature of each liquid crystal panel 441 can be easily uniformized with a simple configuration with high accuracy. Can be implemented. Therefore, the hue of the optical image formed by each liquid crystal panel 441 can be maintained satisfactorily. In addition, deterioration of the liquid crystal panel 441 is prevented, and the life of each liquid crystal panel 441 is effectively extended.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to the drawings.
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, in the optical device 44, the flow rates of the cooling fluid branched by the fluid branching portion 4401 and flowing into the three light modulation element holding bodies 4402 are set to be substantially the same.
On the other hand, in the fifth embodiment, the cooling fluid outflow portions 7401C of the fluid branching portion 7401 and the pipe diameters of the fluid circulation members 748 that connect the fluid branching portions 7401 and the respective light modulation element holding bodies 4402 are different. As a result, the flow rate of the cooling fluid flowing into each light modulation element holding body 4402 is changed.

Specifically, FIG. 31 is a diagram illustrating a fluid branch portion 7401 and a fluid circulation member 748 connected to the fluid branch portion 7401 in the fifth embodiment. Specifically, FIG. 31 is a plan view of the fluid branch portion 7401 viewed from below.
The fluid branch portion 7401 has substantially the same configuration as the fluid branch portion 4401 described in the first embodiment, and is formed such that the three cooling fluid outlet portions 7401R, 7401G, and 7401B have different tube diameters. Only different.
In this embodiment, the tube diameter of the cooling fluid outflow portion 7401G for allowing the cooling fluid to flow out to the light modulation element holding body 4402 holding the liquid crystal panel 441 for G color light is set to the largest tube diameter, and for B color light. The cooling fluid flows out to the light modulating element holding body 4402 for holding the liquid crystal panel 441 for cooling light and the cooling fluid outflow portion 7401B for flowing the cooling fluid to the light modulating element holding body 4402 for holding the liquid crystal panel 441. The pipe diameter of the cooling fluid outflow part 7401R for making it small is set in order.
Further, the fluid circulating member 748 is set to have a different pipe diameter in each fluid circulating member 748R, 748G, 748B in correspondence with the pipe diameter of each cooling fluid outflow portion 7401R, 7401G, 7401B.

  In the fifth embodiment described above, compared to the first embodiment, the cooling fluid outflow portions 7401R, 7401G, 7401B and the cooling fluid outflow portions 7401R, 7401G, By setting the pipe diameters of the fluid circulation members 748R, 748G, and 748B to be different from each other corresponding to the pipe diameter of 7401B, the temperature of each liquid crystal panel 441 can be easily equalized with a simple configuration. Therefore, the hue of the optical image formed by each liquid crystal panel 441 can be maintained satisfactorily.

Although the present invention has been described with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the scope of the present invention. It is.
In each of the above embodiments, the formation positions of the inflow ports 4406H, 5406H, 6406H and the outflow ports 4406I, 5406I, 6405I in the light modulation element holding bodies 4402, 5402, 6402 and the flow direction of the cooling fluid are described in the above embodiments. It is not limited to the formed position and the distribution direction.
For example, in the first embodiment, the outlet 4406I and the inlet 4406H are formed at the upper and lower ends of the frame-like member 4406, but the present invention is not limited thereto, and the outlet 4406I is provided at the upper and lower ends of the frame-like member 4405. And the inlet 4406H may be formed respectively. In addition, the cooling fluid is circulated from the lower side toward the upper side. However, the present invention is not limited to this. It is good also as composition which distributes fluid. Furthermore, the inflow port 4406H and the outflow port 4406I are not limited to the upper and lower ends of the frame-shaped member 4405 or the frame-shaped member 4406, but may be formed at the left and right ends, respectively.

  Further, for example, in the second embodiment, the inflow port 5406H and the outflow port 5406I are formed at the upper end portion of the frame-shaped member 5406. However, the present invention is not limited to this, and the inflow port 5406H is formed at the upper end portion of the frame-shaped member 5405. And the outlet 5406I may be formed respectively. In such a configuration, the cooling fluid flows into the cooling chamber R3 on the light beam incident side of the liquid crystal panel 441 through the inflow port 5406H, and flows on the light beam emission side of the liquid crystal panel 441 through the cylindrical portion 5406C and the insertion hole 5405C. It flows into cooling chamber R4. Furthermore, the inflow port 5406H and the outflow port 5406I are not limited to the upper end portion of the frame-shaped member 5405 or the frame-shaped member 5406, and may be formed at other one end, for example, the lower end.

  Further, for example, in the third embodiment, the outflow port 6405I is formed at the upper end portion of the frame-like member 6405, and the inflow port 6406H is formed at the upper end portion of the frame-like member 6406. The inflow port 6406 </ b> H may be formed at the upper end of the frame-shaped member 6405, and the outflow port 6405 </ b> I may be formed at the upper end of the frame-shaped member 6406. In such a configuration, the cooling fluid flows into the cooling chamber R5 on the light beam incident side of the liquid crystal panel 441 through the inflow port 6406H, and on the light beam emission side of the liquid crystal panel 441 through the cylindrical portion 6406C and the insertion hole 6405C. It flows into the cooling chamber R6. Furthermore, the inflow port 6406H and the outflow port 6405I are formed at the upper end portions of the frame-shaped members 6406 and 6405. However, the present invention is not limited to this, and the inflow port is formed in one of the frame-shaped members 6405 and 6406. However, it is only necessary that the outlet is formed in the other frame-shaped member.

In each of the above embodiments, the formation position and number of communication ports formed in the pair of frame-like members are not particularly limited.
For example, in the first embodiment, only one cylindrical portion 4406C and insertion hole 4405C as a diversion port are formed. However, the present invention is not limited to this, and two or more cylindrical portions may be formed. Moreover, although the cylindrical part 4406C and the insertion hole 4405C were formed in the horizontal direction approximate center part of the downward side, you may form not only in this but in another position. The same applies to the cylindrical portions 5406C and 6406C and the insertion holes 5405C and 6405C in the second embodiment and the third embodiment. Furthermore, although the two cylindrical portions 4406D and the insertion holes 4405D as the junction are formed, the present invention is not limited to this, and may be formed by only one.

  In the first embodiment, the shape of the rectifying portion 4406F formed in the recess 4406E of the frame-like member 4406 is not limited to the shape described in the first embodiment. Both the cooling fluid that has flowed into the cooling chamber R2 through the inflow port 4406H and the cooling fluid that has flowed into the cooling chamber R2 from the cooling chamber R1 through the two cylindrical portions 4406D and the two insertion holes 4405D. Any shape may be used as long as it is distributed toward the inlet, and for example, a substantially C-shaped shape in plan view that expands toward the inlet 4406H may be employed.

  In each of the above-described embodiments, the configuration in which the optical tank 44 includes the main tank 445, the fluid pressure feeding unit 446, and the radiator 447 has been described. However, the configuration is not limited thereto, and the main tank 445, the fluid pressure feeding unit 446, and the radiator 447 are provided. A configuration in which at least one of them is omitted can sufficiently achieve the object of the present invention.

In each of the above embodiments, the incident-side polarizing plate 442 and the exit-side polarizing plate 443 are arranged on the outer surfaces of the pair of frame-like members 4405, 4406, 5405, 5406, 6405, 6406, and the incident-side polarizing plate 442 and the exit-side polarizing plate are arranged. Although each cooling chamber R1-R6 was obstruct | occluded by translucent board | substrate 442A, 443A of the board 443, not only this but each cooling chamber R1 with translucent board | substrates, such as glass with which the polarizing film is not affixed. ~ R6 may be closed. At this time, the incident-side polarizing plate and the emitting-side polarizing plate are not the absorption-type polarizing plates described in the above embodiments, but transmit light beams having a predetermined polarization axis and reflect light beams having other polarization axes. If a reflective polarizing plate is used, an increase in temperature due to a light beam emitted from a light source can be suppressed without cooling the incident side polarizing plate and the outgoing side polarizing plate with a cooling fluid.
In addition, although the incident-side polarizing plate 442 and the exit-side polarizing plate 443 are employed as the optical conversion elements, and the incident-side polarizing plate 442 and the exit-side polarizing plate 443 are cooled with a cooling fluid, the present invention is not limited thereto. As the optical conversion element, a retardation plate or a viewing angle correction plate may be employed, and a configuration in which these optical conversion elements are cooled with a cooling fluid may be employed.

  In each of the above embodiments, the main tank 445, the fluid branching portions 4401 and 7401, and the relay tanks 4404 and 5404 have the cooling fluid inflow portions 445A, 4401A, 4404A, 5404A and 7401A and the cooling fluid outflow portions 445B, 4401C, 4404B and 5404B. , 7401C, and one end portion of the cooling fluid inflow portion 445A, 4401A, 4404A, 5404A, 7401A and the cooling fluid outflow portion 445B, 4401C, 4404B, 5404B, 7401C has been explained. However, it is not limited to this. For example, the fluid circulation members 448 and 748 are directly connected to the main tank 445, the fluid branch portions 4401 and 7401, and the relay tanks 4404 and 5404, and the ends of the fluid circulation members 448 and 748 are connected to the main tank 445 and the fluid branch portion. 4401 and 7401 and relay tanks 4404 and 5404 may be protruded inside.

  In each of the above embodiments, the fluid circulating members 448 and 748, the main tank 445, the fluid pumping portion 446, the tubular member 4472 of the radiator 447, and the frame-like members 4405, 4406, 5405, 5406, and 6405, which are members that come into contact with the cooling fluid. 6406 and relay tanks 4404 and 5404 are made of aluminum members, but are not limited thereto. As long as the material has corrosion resistance, it is not limited to aluminum but may be composed of other materials, for example, oxygen-free copper or duralumin. Further, as the fluid circulation members 448 and 748, butyl rubber or fluorine rubber having a low deformation reaction force to the light modulation element holders 4402, 5402, and 6402 and having a low hardness for suppressing pixel shift may be used.

  The flow rate changing unit 449 in the fourth embodiment is not limited to the configuration employed in the first embodiment, and may be employed in the second embodiment or the third embodiment. At this time, the flow rate changing unit 449 is installed not in the fluid branching unit 4401 but in the relay tank 5404. In addition, the flow rate changing unit 449 is configured by three corresponding to each liquid crystal panel 441, but is not limited thereto, and may be configured by one or two. Furthermore, the flow rate changing unit 449 has been described as being provided in the cooling fluid outflow unit 4401C of the fluid branching unit 4401. However, the present invention is not limited to this, and the fluid circulation member 448 connected to the cooling fluid outflow unit 4401C or the cooling fluid outflow unit 5404B. May be provided. Furthermore, the configuration of the flow rate changing unit 449 is not limited to the configuration described in the fourth embodiment, and a valve is provided in the cooling fluid channel, and the position of the valve is changed to narrow or widen the channel. Other configurations may be used as long as they are configured.

  In each of the embodiments described above, the outer surface of the light modulation element holders 4402, 5402, and 6402 and the bottom surface of the optical component housing 45 are cooled by the blowing of the sirocco fan 31. Even if omitted, the object of the present invention can be sufficiently achieved. Such a configuration can contribute to noise reduction.

  The configuration in the fifth embodiment is not limited to the configuration employed in the first embodiment, and may be employed in the second embodiment or the third embodiment. At this time, similarly to the fluid branch portion 7401, the tube diameters of the three cooling fluid outflow portions 5404B of the relay tank 5404 are set to be different from each other, and the tube diameter of the fluid circulation member 448 connected to these cooling fluid outflow portions 5404B. What is necessary is just to set so that a dimension may also differ. In addition, each cooling fluid outflow portion 7401C of the fluid branching portion 7401 and each pipe diameter of the fluid circulation member 748 connected to each cooling fluid outflow portion 7401C are set to be different from each other. You may employ | adopt the structure which made the pipe diameter smaller or larger than another pipe diameter.

In each of the above embodiments, the configuration in which the optical unit 4 has a substantially L shape in plan view has been described. However, the configuration is not limited thereto, and for example, a configuration having a substantially U shape in plan view may be employed.
In each of the above-described embodiments, only the example of the projector 1 using the three liquid crystal panels 441 has been described. However, the present invention is a projector using only one liquid crystal panel, a projector using only two liquid crystal panels, or The present invention can also be applied to a projector using four or more liquid crystal panels.
In each of the above embodiments, a transmissive liquid crystal panel having a different light incident surface and light emitting surface is used. However, a reflective liquid crystal panel having the same light incident surface and light emitting surface may be used.
In each of the embodiments, the liquid crystal panel is used as the light modulation element. However, a light modulation element other than liquid crystal, such as a device using a micromirror, may be used. In this case, polarizing plates on the light beam incident side and the light beam emission side can be omitted.
In the above embodiments, only the example of the front type projector that projects from the direction of observing the screen has been described. However, the present invention is a rear type projector that projects from the side opposite to the direction of observing the screen. Is also applicable.

Although the best configuration for carrying out the present invention has been disclosed in the above description, the present invention is not limited to this. That is, the invention has been illustrated and described primarily with respect to particular embodiments, but may be configured for the above-described embodiments without departing from the scope and spirit of the invention. Various modifications can be made by those skilled in the art in terms of materials, quantity, and other detailed configurations.
Therefore, the description limited to the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such is included in this invention.

  Since the light modulation element holder of the present invention can be efficiently cooled by the cooling fluid, it is useful as a light modulation element holder for projectors used in home theaters and presentations.

The figure which shows typically schematic structure of the projector in each embodiment. FIG. 3 is a perspective view of a part of the projector according to the first embodiment as viewed from above. The perspective view which looked at a part in the projector in the said embodiment from the downward side. The figure which shows the structure of the main tank in the said embodiment. The figure which shows schematic structure of the optical apparatus main body in the said embodiment. The figure which shows schematic structure of the optical apparatus main body in the said embodiment. The figure which shows the structure of the fluid branch part in the said embodiment. The disassembled perspective view which shows schematic structure of the light modulation element holding body in the said embodiment. The figure which shows schematic structure of the frame-shaped member in the said embodiment. The figure which shows schematic structure of the frame-shaped member in the said embodiment. The figure which shows the structure of the relay tank in the said embodiment. The figure which shows the structure of the radiator in the said embodiment, and the arrangement | positioning relationship between a radiator and an axial flow fan. The figure for demonstrating the cooling structure of the liquid crystal panel in the said embodiment, the incident side polarizing plate, and the injection | emission side polarizing plate. The figure for demonstrating the cooling structure of the liquid crystal panel in the said embodiment, the incident side polarizing plate, and the injection | emission side polarizing plate. The figure for demonstrating the cooling structure of the liquid crystal panel in the said embodiment, the incident side polarizing plate, and the injection | emission side polarizing plate. The figure which shows schematic structure of the optical apparatus main body in 2nd Embodiment. The figure which shows schematic structure of the optical apparatus main body in the said embodiment. The disassembled perspective view which shows schematic structure of the light modulation element holding body in the said embodiment. The figure which shows schematic structure of the frame-shaped member in the said embodiment. The figure which shows schematic structure of the frame-shaped member in the said embodiment. The figure for demonstrating the cooling structure of the liquid crystal panel in the said embodiment, the incident side polarizing plate, and the injection | emission side polarizing plate. The figure for demonstrating the cooling structure of the liquid crystal panel in the said embodiment, the incident side polarizing plate, and the injection | emission side polarizing plate. The figure for demonstrating the cooling structure of the liquid crystal panel in the said embodiment, the incident side polarizing plate, and the injection | emission side polarizing plate. The perspective view which shows schematic structure of the optical apparatus main body in 3rd Embodiment. The disassembled perspective view which shows schematic structure of the light modulation element holding body in the said embodiment. The figure which shows schematic structure of the frame-shaped member in the said embodiment. The figure which shows schematic structure of the frame-shaped member in the said embodiment. The figure for demonstrating the cooling structure of the liquid crystal panel in the said embodiment, the incident side polarizing plate, and the injection | emission side polarizing plate. The figure for demonstrating the cooling structure of the liquid crystal panel in the said embodiment, the incident side polarizing plate, and the injection | emission side polarizing plate. The figure which shows the structure and installation position of the flow volume change part in 4th Embodiment. The figure which shows the fluid circulation member connected with the fluid branch part in 5th Embodiment, and this fluid branch part.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 5 ... Projection lens (projection optical apparatus), 44 ... Optical apparatus, 411 ... Light source device, 441, 441R, 441G, 441B ... Liquid crystal panel (light modulation element), 442 ... Incident side polarizing plate (optical conversion element), 442A ... Translucent substrate, 443 ... Emission side polarizing plate (optical conversion element), 443A ... Translucent substrate, 443B ... Polarizing film (optical conversion film), 444 ... Cross dichroic prism (color synthesis optical device), 448,748 ... fluid circulation member, 449 ... flow rate changing unit, 4401,7401 ... fluid branching unit, 4401A: Cooling fluid inflow portion, 4401C, 7401C ... Cooling fluid outflow portion, 4402, 5402, 6402 ... Light modulation element holder, 4405, 4406, 5405, 5406, 64 5, 6406 ... frame-like member, 4405A, 4406A, 5405A, 5406A, 6405A, 6406A ... opening, 4405A1, 4406A1, 5405A1, 5406A1, 6405A1, 6406A1 ... slope, 4405C, 4405D, 5405C, 5405D, 6405C ... cylindrical portion insertion hole (communication port), 4405F, 4406E, 5405F, 5406E, 6405F, 6406E ... concave portion, 4406C, 4406D, 5406C, 5406D, 6406C ... cylindrical portion (communication port), 4406C1, 4406D1, 5406C1, 5406D1, 6406C1 ... Hole, 4406C2 ... Projection, 4406F ... Rectification part, 4406H, 5406H, 6406H ... Inlet, 4406I, 5406I, 6405 ... Outlet, 4407, 5407, 6407 ... Elastic member, 4407B1, 5407B1, 6407B1 ... Insertion hole, 5404 ... Relay tank (fluid branch), 5406N ... Partition, R1, R2, R3, R4, R5, R6 ... Cooling chamber.

Claims (19)

A light modulation element that modulates the light beam emitted from the light source according to image information to form an optical image is held, and a cooling chamber in which a cooling fluid is enclosed is formed. A light modulation element holder for cooling the modulation element,
An opening is formed in accordance with an image forming area of the light modulation element, and a pair of frame-shaped members that sandwich the light modulation element are disposed on a surface opposite to the facing surface of the pair of frame-shaped members. Comprising a translucent substrate,
In the cooling chamber, the opposing surface side and the surface side opposite to the opposing surface in the opening of the pair of frame-shaped members are respectively closed by the light modulation element and the translucent substrate. Formed inside both of the pair of frame-shaped members,
The pair of frame-shaped members include an inlet for allowing the cooling fluid to flow into the cooling chamber, an outlet for allowing the cooling fluid in the cooling chamber to flow out, and a communication port for connecting the cooling chambers in communication. And a light modulation element holding body. The light modulation element holding body according to claim 1,
The inflow port and the outflow port are respectively formed at opposed positions of opposing side end portions of any one of the pair of frame-shaped members.
The communication port is provided on a side end portion side where the inflow port is formed, and the cooling fluid that has flowed into the inside through the inflow port, the cooling chamber in the one frame-shaped member, and the other frame A diversion port for diverting to the cooling chamber in the member, and a cooling fluid that is provided on the side end side where the outflow port is formed and flows in the cooling chamber in the other frame member in the one frame member. A light modulation element holding body comprising: a confluence that flows into the cooling chamber. The light modulation element holder according to claim 2,
The diversion port is connected in communication with the inflow port so that a part of its inner surface intersects the inflow direction of the cooling fluid flowing in from the inflow port,
The light modulation element holding member according to claim 1, wherein a part of the inner surface is formed with a protruding portion for diverting the cooling fluid flowing in through the inflow port to the cooling chambers. In the light modulation element holder according to claim 2 or 3,
In the vicinity of the outlet, the cooling fluid that has flowed into the cooling chamber of the one frame-like member through the inlet is circulated toward the outlet, and the other frame-like is connected through the junction. A light modulation element holding body, wherein a rectifying section is formed to flow the cooling fluid flowing from the cooling chamber in the member into the cooling chamber in the one frame-shaped member toward the outlet. The light modulation element holding body according to claim 1,
The inflow port and the outflow port are respectively formed at one side end portion of any one of the pair of frame-shaped members.
The communication port is disposed on a side end portion side facing the one side end portion, and a side end portion facing the one side end portion from the one side end portion side in the cooling chamber in the one frame-shaped member. A first communication port through which the cooling fluid flowing to the side flows into the cooling chamber of the other frame-like member, and the one side end of the other frame-like member inside the cooling chamber, And a second communication port for allowing the cooling fluid flowing from the side end facing the portion to the one end side to flow into the cooling chamber of the one frame-like member. Element holder. The light modulation element holder according to claim 5,
On the surface opposite to the facing surface of the one frame-shaped member, a concave portion that is recessed toward the optical axis direction of the irradiated light beam is formed on the one side end portion side of the opening periphery,
The inflow port and the outflow port are respectively formed so as to penetrate the side wall of the recess,
The concave portion divides the second communication port and the outflow port, the first communication port and the inflow port in a plane, and from the cooling chamber in the other frame-shaped member via the second communication port. The light modulation element holding member is characterized in that a partition wall is formed through which the cooling fluid that has flowed into the cooling chamber of the one frame-shaped member flows to the outlet. The light modulation element holding body according to claim 1,
The inlet is formed in any one of the pair of frame-shaped members, and allows the cooling fluid to flow into a cooling chamber in the one frame-shaped member,
The communication port distributes the cooling fluid in the cooling chamber in the one frame-shaped member to the cooling chamber in the other frame-shaped member,
The outflow port is formed in any one of the pair of frame-shaped members, and causes the cooling fluid in the cooling chamber in the other frame-shaped member to flow out to the outside. Element holder. In the light modulation element holding body according to any one of claims 1 to 7,
The communication port is formed in one of the pair of frame-shaped members, has a hole communicating with the inside of the cooling chamber in the one frame-shaped member, and faces the other frame-shaped member A cylindrical portion that protrudes, and a cylindrical portion insertion hole that is formed in the other frame-shaped member, communicates with a cooling chamber in the other frame-shaped member, and allows the cylindrical portion to be inserted. A light modulation element holding member. The light modulation element holder according to claim 8,
An elastic member interposed between the other frame-shaped member and the light modulation element;
The elastic member is provided with an insertion hole through which the cylindrical portion can be inserted. In the light modulation element holding body according to any one of claims 1 to 9,
The pair of frame-shaped members are respectively formed with recesses that are recessed toward the optical axis direction of the irradiated light flux on the periphery of the opening on the surface opposite to the facing surface,
The communication port is configured to communicate and connect the cooling chambers through the recess. In the light modulation element holder according to claim 10,
An inclined surface is formed on the peripheral edge of the opening so as to increase the opening area toward the recess. In the light modulation element holder according to claim 10 or 11,
The side wall of the recess is formed in a curved surface so that the cooling fluid in the cooling chamber can be guided to a predetermined position. An optical device configured to include a light modulation element that modulates a light beam emitted from a light source according to image information to form an optical image,
The light modulation element holder according to any one of claims 1 to 12,
A plurality of fluid circulation members that are connected to the inlet and outlet of the light modulation element holding body, guide the cooling fluid to the outside of the cooling chamber, and guide the cooling fluid to the inside of the cooling chamber again. Optical device. The optical device according to claim 13.
Comprising at least one optical conversion element for converting the optical characteristics of the incident light beam;
The optical conversion element includes a translucent substrate and an optical conversion film that is formed on the translucent substrate and converts an optical characteristic of an incident light beam.
An optical apparatus, wherein at least one of the translucent substrates constituting the light modulation element holding body is a translucent substrate constituting the optical conversion element. The optical device according to claim 14.
The light modulation element comprises a plurality of;
The light modulation element holding body is composed of a plurality corresponding to the plurality of light modulation elements,
The cooling fluid which is installed in the flow path of the cooling fluid in the plurality of fluid circulation members and flows into the inside is branched and sent to each of the plurality of light modulation element holders via the plurality of fluid circulation members. A color synthesizing optical device that has a fluid branching unit and a plurality of light beam incident side end surfaces to which the plurality of light modulation element holders are attached, and synthesizes and emits the respective color lights modulated by the plurality of light modulation elements; With
The optical device, wherein the fluid branching portion is attached to any one of the end surfaces intersecting with the plurality of light beam incident side end surfaces of the color synthesizing optical device. The optical device according to claim 15, wherein
An optical apparatus comprising: a flow rate changing unit that can change a flow rate of the cooling fluid flowing through each of the light modulation element holding bodies according to a heat generation amount of the plurality of light modulation elements. The optical device according to claim 15, wherein
The optical device is characterized in that the plurality of fluid circulation members are formed of tubular members and have different tube diameters according to the amount of heat generated by the plurality of light modulation elements. The optical device according to any one of claims 15 to 17,
The fluid branching portion has a cooling fluid inflow portion that is connected to the plurality of fluid circulation members and allows the cooling fluid to flow into the inside, and a cooling fluid outflow portion that causes the cooling fluid to flow out to the outside,
The cooling fluid inflow portion and the cooling fluid outflow portion have a tube shape through which the cooling fluid can flow, and one end portion protrudes toward the inside of the fluid branching portion. .   A projector comprising: a light source device; the optical device according to any one of claims 13 to 18; and a projection optical device that magnifies and projects an optical image formed by the optical device.

Images