JP2006126456A - Optical modulation element holder, optical apparatus and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical modulation element holder capable of satisfactorily maintaining an optical image formed by an optical modulation element while efficiently cooling the optical modulation element by cooling fluid, and to provide an optical apparatus and a projector. <P>SOLUTION: A cooling chamber in which the cooling fluid for cooling a liquid crystal panel 441 is sealed is formed in each of a pair of frame-like members 4405 and 4406 constituting the optical modulation element holder 4402. A cooling chamber partitioning part 4400 whose size is planarly larger than the optical modulation surface of the liquid crystal panel 441, constituted of a translucent plate member, and for partitioning the cooling chamber into two areas, that is, an area on the luminous flux incident side and an area on the luminous flux exit side is disposed in each cooling chamber. A light shielding part 4400B for shielding the incident luminous flux is disposed in each cooling chamber partitioning part 4400 so as to planarly surround the optical modulation surface of the liquid crystal panel 441. <P>COPYRIGHT: (C)2006,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, A projector is known that includes a projection optical device that magnifies 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 mask, 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). .
That is, the cooling device described in Patent Document 1 includes a cooling chamber that supports the light modulation element and the polarizing plate on the light source side in a separated state and is filled with a cooling fluid. The cooling chamber is connected in communication with a radiator and a fluid pump by a tube or the like capable of circulating a cooling fluid therein. For this reason, an internal cooling fluid circulates through the flow path of a cooling chamber, a radiator, a fluid pump, and a cooling chamber via a tube or the like. With such a configuration, the heat generated in the light beam transmission region of the light modulation element and the incident side polarizing plate is directly radiated to the cooling fluid by the light beam irradiated from the light source.

JP-A-1-159684

However, the cooling device described in Patent Document 1 has a configuration in which the cooling fluid flows directly into the inside of the cooling chamber via a tube or the like, and therefore the flow velocity of the cooling fluid at each position in the cooling chamber tends to be different. Thus, when the flow velocity of the cooling fluid is different at each position in the cooling chamber, the optical image formed by the light modulation element includes a streak image extending in the direction in which the cooling fluid flows, and the optical image is excellent. Cannot be maintained.
In addition, unnecessary light such as stray light that is different from the illumination light emitted from the light source and illuminated on the light modulation surface of the light modulation element is incident on the light modulation surface of the light modulation element from the outside in a plane more than the light modulation surface. It is also possible to do. In this way, when unnecessary light is incident on the light modulation surface of the light modulation element, an unnecessary image is included in the optical image, and the optical image formed by the light modulation element cannot be maintained well. The cooling device described in Patent Document 1 does not disclose or suggest a specific structure for shielding the above-described unnecessary light. Accordingly, it cannot be said that the optical image formed by the light modulation element can be satisfactorily maintained.

  An object of the present invention is to provide a light modulation element holder, an optical device, and a projector that can efficiently maintain an optical image formed by a light modulation element while efficiently cooling the light modulation element with a cooling fluid. It is in.

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. And a pair of frames that each have an opening formed in accordance with a light modulation surface of the light modulation element and sandwich the light modulation element, the light modulation element holding body cooling the light modulation element with a cooling fluid in the cooling chamber And a translucent substrate disposed on at least one of the opposing surfaces of the pair of frame-shaped members, and the cooling chamber includes the pair of frames The at least one of the opposing surface side and the surface opposite to the opposing surface in the opening of the shaped member is closed by the light modulation element and the translucent substrate, respectively. Frame member Formed in at least one of the frame-shaped members, and at least one of the pair of frame-shaped members includes an inlet for allowing the cooling fluid to flow into the cooling chamber, and an inside of the cooling chamber. The cooling fluid is made up of an outflow port for allowing the cooling fluid to flow out, and a plate-like member having a shape larger in plan than the light modulation surface of the light modulation element and having a light-transmitting property. A cooling chamber partitioning section that divides the chamber into two regions on the light beam incident side and the light beam emitting side is provided, and the cooling chamber partitioning unit shields the incident light beam so as to surround the light modulation surface in a plane. A portion is provided.
Here, the light modulation element holding body may have a structure having one light-transmitting substrate or two structures. For example, in the configuration having only one translucent substrate, the surface side of the opposing surface side and the surface opposite to the opposing surface in the opening of the pair of frame-shaped members by the translucent substrate and the light modulation element is Each is closed and a cooling chamber is formed only inside one of the frame-shaped members. Further, for example, in the configuration having two light-transmitting substrates, the two light-transmitting substrates and the light modulation element block the opposite surface side and the surface opposite to the opposite surfaces in the openings of the pair of frame-shaped members, respectively. A cooling chamber is formed inside each of the pair of frame members.

According to the present invention, since the cooling chamber section is disposed in the cooling chamber, the cooling fluid flowing in via the inlet is temporarily dammed by the side end on the inlet side in the cooling chamber section, Rectification can be performed on the light beam incident side and the light beam emission side of the cooling chamber partition. For this reason, the flow velocity of the cooling fluid at each position in the cooling chamber can be made uniform, and the optical image formed by the light modulation element is formed by the light modulation element without including a streak image. An optical image can be maintained well.
In addition, by disposing the cooling chamber section in the cooling chamber, the thickness of the cooling fluid layer in contact with the light modulation element in the cooling chamber can be reduced, and the convection speed of the cooling fluid in contact with the light modulation element can be increased. . Therefore, the in-plane temperature of the light modulation element can be made uniform, local overheating can be avoided, and a clear optical image can be formed by the light modulation element.
Furthermore, since the light shielding part is provided in the cooling chamber partition part, it is possible to shield unnecessary light incident from the outside in a plane more than the light modulation surface. For this reason, the image formed by the unnecessary light is not included in the optical image formed by the light modulation element, and the optical image formed by the light modulation element can be favorably maintained.

In the light modulation element holding body of the present invention, the light shielding portion is emitted from the light source and emitted to the light modulation surface of the light modulation element and / or from the light modulation surface of the light modulation element. It is preferable that the cooling chamber partition portion is provided so that the opening end portion of the light shielding portion is located at a boundary position through which the optical image passes.
According to the present invention, since the light shielding portion is provided in the cooling chamber partitioning portion so that the opening end of the light shielding portion is located at the boundary position where the illumination light and / or the optical image passes, the light shielding portion is illuminated. Only unnecessary light can be effectively shielded without interfering with light and / or an optical image. For this reason, the optical image formed by the light modulation element can be maintained better.

In the light modulation element holding body of the present invention, the cooling chamber is formed inside each of the pair of frame-shaped members, and the cooling chamber partitioning portion is formed on the light beam incident side and the light beam emission side of the light modulation element. It is preferable that each is disposed.
According to the present invention, since the cooling chamber partitioning portions are respectively disposed on the light beam incident side and the light beam emission side of the light modulation element, both from the light beam incident side and the light beam emission side toward the light modulation surface of the light modulation element. Unnecessary incident light can be blocked. For this reason, the optical image formed by the light modulation element can be maintained even better.

In the light modulation element holder of the present invention, it is preferable that the light shielding portion is provided on the facing surface side in the cooling chamber partitioning portion.
According to the present invention, since the light shielding portion is provided on the opposite surface side in the cooling chamber partition portion, the light shielding portion is provided on the surface side opposite to the opposite surface in the cooling chamber partition portion. The position of the light shielding portion can be set to a position close to the light modulation surface of the light modulation element. For this reason, the shielding angle of unnecessary light incident on the light modulation surface of the light modulation element can be set large, and unnecessary light can be shielded more reliably.

In the light modulation element holding body of the present invention, it is preferable that the light shielding portion is formed of a thin film deposited on the cooling chamber partition portion.
According to the present invention, since the light-shielding portion is composed of a thin film, for example, by configuring the light-shielding portion with a thin film of metal or the like having a high specific heat and high thermal conductivity, the heat dissipation area of heat generated in the light-shielding portion due to the shielding of unnecessary light The heat exchange capacity with the cooling fluid can be improved. For this reason, it is possible to suppress the temperature rise in the cooling chamber section, and even if the light shielding section is formed only on one of the end face on the light incident side and the end face on the light exit side of the cooling chamber section, the cooling is performed. It is also possible to suppress the temperature difference between the cooling fluids flowing through the light beam entrance side and the light beam exit side of the chamber partition. Therefore, the in-plane temperature of the light modulation element facing the cooling chamber section can be maintained well in a uniform state.

In the light modulation element holding body of the present invention, it is preferable that the light shielding portion is constituted by a frame-like member that surrounds the light modulation surface in a plane and is attached to the cooling chamber partition portion.
According to the present invention, since the light shielding portion is configured by the frame-like member, the light shielding portion can be easily manufactured by, for example, pressing, etc., compared to the case where the light shielding portion is configured by a thin film, and the light shielding portion is manufactured. The manufacturing cost can be reduced.

In the light modulation element holder of the present invention, the cooling chamber partition is formed by laminating a plurality of plate-like members, and an incident light flux is provided between at least one of the plurality of plate-like members. It is preferable that at least one optical conversion element for converting the optical characteristics of the above is interposed.
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 optical conversion element is interposed between at least one of the plurality of plate-like members in the cooling chamber partition portion, not only the light modulation element but also emitted from the light source The heat generated in the optical conversion element by the light flux can also be radiated to the cooling fluid convection to the light flux incident side and the light flux emission side of the cooling chamber partition through the plate-like member.
Further, since not only the light modulation element but also the peripheral optical conversion element can be integrated with the light modulation element holding body, it is possible to reduce the size in addition to improving the cooling performance of these optical elements.

An optical device of the present invention is 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, and includes the light modulation element holding body described above. 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.

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 incident light beam. It is preferable that the translucent substrate that includes the optical conversion film that converts the optical characteristics of the optical modulation element and forms the light modulation element holding body is the translucent substrate that forms the optical conversion element.
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 as described above.
According to the present invention, the translucent substrate that constitutes the optical modulation element holder is the translucent substrate that constitutes the optical conversion element, and therefore optical conversion is performed not only by the optical modulation element but also by the light beam emitted from the light source. The heat generated in the film can also be dissipated to the cooling fluid that convects the cooling chamber.
Further, since not only the light modulation element but also the peripheral optical conversion element can be integrated with the light modulation element holding body, it is possible to reduce the size in addition to improving the cooling performance of these optical elements.

A projector according to an aspect of the invention includes a light source device, the above-described optical device, and a projection optical device that enlarges and projects an optical image formed by the optical device.
According to the present invention, since the projector includes the light source device, the above-described optical device, and the projection optical device, it can enjoy the same operations and effects as the above-described optical device.
Further, by providing the optical device described above, the optical image formed by the light modulation element can be favorably maintained, and a clear optical image can be enlarged and projected by the projection optical device.

[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 block, a lamp driving 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 therein. Although not shown, the exterior case 2 includes an upper case that configures the top, front, back, and side surfaces of the projector 1, and a lower case that configures 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 to the inside of the optical unit 4. The sirocco fan 31 that blows the cooling air to the panel and the partition wall 21 formed in the outer case 2 are located inside the partition wall 21, and the cooling air outside the projector 1 is introduced into the inside from the air inlet 22 (see FIG. 2) formed in the outer case 2. 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, optical components 41 to 43, and optical devices to be described later. And an optical component housing 45 for housing and arranging the apparatus main body.
The integrator illumination optical system 41 is an optical system for illuminating a light modulation surface (image forming region) 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, and the reflector 417 is configured by an elliptical mirror, and a light beam reflected by the elliptical mirror on the light beam emission side is converted into parallel light. 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 red light, which will be described later of the optical device 44, of red light separated by the color separation optical system 42. It has the function of leading to the liquid crystal panel for light.

  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 beam emitted from the second lens array 413 into a light beam parallel to the central axis (principal light beam). The same applies to the field lens 418 provided on the light incident side of the other liquid crystal 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. In this embodiment, since the optical path length of red light is long, such a configuration is adopted. However, a configuration in which the optical path length of blue light is increased is also conceivable.

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 branch, a light modulation element holder, a support member, 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. The substrates 441C and 441D are electrically connected to a control device (not shown) and serve as circuit boards that output predetermined drive signals to the scanning lines, the data lines, the switching elements, the common electrodes, and the like. A flexible printed board 441E (see FIG. 8) is 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.
In this flexible printed circuit board 441E (see FIG. 8), an insertion hole 441E1 is formed at a substantially central portion in the width direction on the lower end side. And the cylindrical part of the light modulation element holding body mentioned later which constitutes optical device 44 is inserted in this penetration hole 441E1.
In the liquid crystal panel 441, the outer shape of the drive substrate 441C is set larger than the outer shape of the counter substrate 441D. That is, the liquid crystal panel 441 is formed in a stepped shape in which the outer shape becomes smaller toward the light beam incident side.

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. Of the incident light beams, the polarization axis of the light beams aligned by the polarization conversion element 414 is substantially the same. 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) is pasted on a translucent substrate 442A (see FIG. 8) such as a white plate or tempered glass (Tempax).
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.
Note that the light-transmitting substrates 442A and 443A of the incident-side polarizing plate 442 and the emitting-side polarizing plate 443 described above are not limited to white plate / tempered glass (Tempax), but are sapphire glass, crystal, or YAG having good thermal conductivity. (Yttrium Aluminum Garnet) may be used. In such a configuration, heat generated in the polarizing film of the incident-side polarizing plate 442 and the polarizing film 443B of the emitting-side polarizing plate 443 can be radiated well to the translucent substrates 442A and 443A.
Moreover, it is preferable that the thickness dimension of translucent board | substrate 442A, 443A is 0.5 mm or more, More preferably, it is preferable that they are 0.7 mm-1.1 mm. In such a configuration, the translucent substrates 442A and 443A are not deformed even when a reaction force caused by pressing an elastic member described later is applied, and the polarization axes of the polarizing plates 442 and 443 are prevented from being distorted. it can. For this reason, optical performance such as contrast can be maintained satisfactorily.

  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 of explanation, 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 later 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 main 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 this component storage member 451, on the bottom surface, as shown in FIG. 3, three holes 451C formed corresponding to the position of the liquid crystal panel 441 of the optical device 44, and a fluid branching portion to be described later of the optical device 44 are provided. 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 be convected 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.

[Main tank structure]
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 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 stores 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.

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.

[Structure of fluid pumping section]
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. The fluid pumping unit 446 is disposed below the projection lens 5 as shown in FIG.

[Structure of optical device body]
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.

[Structure of fluid branch part]
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 forcedly sent from the fluid pressure sending portion 446, and sends the supplied cooling fluid to 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 able to transfer heat.

Further, in this fluid branching portion 4401, the three cooling light sources 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 4401 </ b> C that branches and flows out for each body 4402 is formed.
Like the cooling fluid inflow portion 4401A, these cooling fluid outflow portions 4401C are composed 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 projecting 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. Then, by bringing the lower surface of the cross dichroic prism 444 into contact with the bulging portion 4401D, the position of the cross dichroic prism 444 in the tilt direction with respect to the fluid branching portion 4401 can be adjusted.

[Structure of light modulation element holder]
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, a support frame 4409, and 2 Two cooling chamber sections 4400.

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-shaped member 4405 is a substantially rectangular aluminum frame having a rectangular opening 4405A corresponding to the light modulation surface of the liquid crystal panel 441 at a substantially central portion, and has a luminous flux with respect to the frame-shaped member 4406. 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-like member 4405, a concave portion 4405B that is recessed toward the light beam incident side is formed on the end surface on the light beam exit side, as shown in FIG. The concave portion 4405B corresponds to the shape of a second elastic member, which will be described later, of the elastic member 4407. The concave portion 4405B is positioned at the peripheral portion of the opening 4405A and has a substantially rectangular frame shape in plan view. The second recess 4405B2 is located in the portion and has a substantially circular shape in plan view. The concave portions 4405B support the light beam incident side end surface of the liquid crystal panel 441 via the second elastic member and the support 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 light beam incident side end surface of the second elastic member, the support frame body 4409, and the liquid crystal panel 441. The side is blocked.
Further, as shown in FIG. 9 (A) or FIG. 9 (B), a hole 4405C1 penetrating the light beam emission side end surface and the light beam incident side end surface is provided in the substantially horizontal central portion on the lower side of the first recess 4405B1. Thus, a cylindrical portion 4405 </ b> C that protrudes substantially orthogonally from the end surface on the light beam exit side and is inserted into an insertion hole described later of the frame-shaped member 4406 is formed.
The cylindrical portion 4405C is connected in communication so as to be substantially orthogonal to an inflow port described later. A part of the inner surface of the cylindrical portion 4405C extends so as to intersect the central axis of the inflow port. Further, on a part of the inner surface of the cylindrical portion 4405C, a projecting portion 4405C2 (see FIG. 18) that diverts the cooling fluid that has flowed in through the inflow port to the light beam incident side and the light beam emission side of the frame-shaped member 4405. Is formed.
Further, as shown in FIG. 9 (A) or FIG. 9 (B), a substantially center portion of the second recess 4405B2 penetrates the end face on the light emission side and the end face on the light incident side, and a cylinder to be described later of the frame-shaped member 4406. An insertion hole 4405D is formed through which the shape portion can be inserted.

Further, in the 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. 9B, four positioning protrusions 4405K for positioning and fixing the cooling chamber partitioning portion 4400 are formed on the light incident side of the inner side surface of the opening 4405A.
As shown in FIG. 9B, these positioning protrusions 4405K are located in the vicinity of the four corner positions on the inner surface of the opening 4405A, and are formed in a columnar shape having a substantially right-angled triangle in section. As shown in FIG. 9B, these positioning projections 4405K have an end face corresponding to the hypotenuse of a substantially right-angled triangle in cross section facing the light incident side, and the thickness dimension in the optical axis direction gradually increases toward the center in the vertical direction. It is arranged to be smaller.

Further, as shown in FIG. 9B, a concave portion 4405F having a depth dimension larger than that of the concave portion 4405E is formed on the end surface of the light beam incident side at the periphery of the upper and lower end portions of the opening 4405A. And it is formed so as to be connected to the insertion hole 4405D.
Among these concave portions 4405F, the upper side wall of the concave portion 4405F positioned on the upper side is formed in a curved shape so that the substantially central portion in the left-right direction is recessed upward. 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.
Further, rectifying portions 4405J are provided upright on the bottom surfaces of the recesses 4405F.
These rectifying parts 4405J are respectively composed of two columnar parts 4405J1 having a triangular prism shape having a substantially right-angled cross section. As shown in FIG. 9B, these columnar portions 4405J1 have a rectifying surface 4405J2 that rectifies the cooling fluid that has flowed in through an inlet, which will be described later, in a direction parallel to the light modulation surface of the liquid crystal panel 441. Yes. As shown in FIG. 9B, these columnar portions 4405J1 are arranged at predetermined intervals, and the rectifying surfaces 4405J2 corresponding to the hypotenuses having a substantially right-angled cross section are mutually formed in the holes of the cylindrical portion 4405C. It arrange | positions so that it may spread in the separation direction of 4405C1 or the insertion hole 4405D.
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 R <b> 1 (see FIG. 18) capable of enclosing a cooling fluid in a gap between the plate 442 and the plate 442 is formed.

Further, in this frame-shaped member 4405, connection portions 4405G for connection to the frame-shaped member 4406 are formed at the left end corner portion and the right end corner portion, respectively, as shown in FIG. .
Furthermore, in the frame-like member 4405, three hooks 4405H with which the polarizing plate fixing member 4408A is engaged are respectively formed at the left end and the right end as shown in FIG.
These three hooks 4405H are formed at the left end portion and the right end portion in the vicinity of the end portion in the vertical direction and in the substantially central portion in the vertical direction, respectively, and are arranged symmetrically about the substantially central portion in the vertical direction.

  In addition, in this frame-like member 4405, the lower side end portion substantially in the middle portion, as shown in FIG. 9, penetrates the side wall on the lower side of the concave portion 4405F located on the lower side, and external cooling fluid is supplied to the inside. An inflow port 4405I is formed to flow in. The inflow port 4405I is composed of a substantially cylindrical member having a pipe diameter smaller than that of the fluid circulation member 448, and is formed so as to protrude to the outside of the frame-like member 4405. The projecting end of the inflow port 4405I is connected to the other end of the fluid circulation member 448 connected to the cooling fluid outflow portion 4401C of the fluid branching portion 4401, and the fluid branching portion 4401 is connected via the fluid circulation member 448. The cooling fluid that has flowed out of the air flows into the interior.

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-like member 4406 has a substantially rectangular aluminum frame in a plan view and has a rectangular opening 4406A corresponding to the light modulation surface of the liquid crystal panel 441 at a substantially central portion, similar to the frame-like 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 support 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 face 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), the concave portion 4406B has a frame-shaped member 4405 that penetrates the end surface on the light emission side and the end surface on the light incident side. An insertion hole 4406C through which the cylindrical portion 4405C can be inserted is formed. In a state where the frame-shaped member 4406 and the frame-shaped member 4405 are combined, the cylindrical portion 4405C of the frame-shaped member 4405 has an insertion hole to be described later of the support frame body 4409 and a third elastic member to be described later of the elastic member 4407. The insertion hole 4406C in the frame-like member 4406 is inserted through the insertion hole. For this reason, the cooling fluid that has flowed into the frame-like member 4405 through the inlet 4405I is diverted to the protruding portion 4405C2 (see FIG. 18) of the cylindrical portion 4405C, and passes through the hole 4405C1 and the insertion hole 4406C of the cylindrical portion 4405C. It flows through the light beam incident side (cooling chamber R1 (see FIG. 18)) of the frame-shaped member 4405 and the light beam emission side (cooling chamber R2 (see FIG. 18) described later) of the frame-shaped member 4406.

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, four positioning protrusions 4406N similar to the positioning protrusion 4405K in the frame-like member 4405 are formed on the inner surface of the opening 4406A.
Further, as shown in FIG. 10A, a concave portion 4406E having a depth dimension larger than that of the concave portion 4406B is formed on the end surface of the light beam emission side at the periphery of the upper and lower ends of the opening portion 4406A. Each is formed so as to be connected to the hole of the shape portion.
Note that the shape of the recess 4406E is substantially the same as the shape of the recess 4405F in the frame-shaped member 4405 described above, and a description thereof will be omitted.
Further, on the bottom surface of the concave portion 4406E, a rectifying portion 4406M (a columnar portion 4406M1 and a rectifying surface 4406M2), which is the same as the rectifying portion 4405J (including the columnar portion 4405J1 and the rectifying surface 4405J2) erected on the concave portion 4405F of the frame-like member 4405, is provided. Are formed).

Further, in the frame-shaped member 4406, a concave portion 4406G that is recessed toward the light beam exit side is formed on the end surface on the light beam incident side, as shown in FIG. The concave portion 4406G corresponds to the shape of a third elastic member, which will be described later, of the elastic member 4407. The concave portion 4406G is positioned at the peripheral portion of the opening 4406A and has a substantially rectangular frame shape in plan view. It is comprised by the 2nd recessed part 4406G2 which is located in a part and has planar-view substantially circular shape. These concave portions 4406G support 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.
Further, as shown in FIG. 10 (A) or FIG. 10 (B), the upper portion of the first recess 4406G1 has a light beam corresponding to the insertion hole 4405D in the frame-shaped member 4405 described above. A cylindrical portion 4406D is formed which has a hole 4406D1 penetrating the exit side end surface and the light beam incident side end surface and protrudes substantially orthogonally from the light beam incident side end surface. In a state where the frame-shaped member 4406 and the frame-shaped member 4405 are combined, the cylindrical portion 4406D of the frame-shaped member 4406 is inserted into the insertion hole 441E1 of the flexible printed board 441E in the liquid crystal panel 441 and the insertion of the support frame body 4409, which will be described later. The hole and the elastic member 4407 are inserted into the insertion hole 4405D of the frame-like member 4405 through the insertion hole of the second elastic member described later. Therefore, the light beam incident side (cooling chamber R1 (see FIG. 18)) of the frame-shaped member 4405 and the light beam emission side (cooling chamber R2 (see FIG. 18) described later) of the frame-shaped member 4406 are formed in the hole 4406D1 of the cylindrical portion 4406D. And the cooling fluid can flow through the insertion hole 4405D.

Here, the inner diameter of the cylindrical portions 4405C and 4406D is preferably, for example, 1 mm to 5 mm, and more preferably 2 mm to 3 mm. In the present embodiment, the inner diameter cross-sectional area of the cylindrical portion 4405C and the inner diameter cross-sectional area of the cylindrical portion 4406D are configured with substantially the same cross-sectional area. Further, the inner diameters of the insertion holes 4406C and 4405D are set to dimensions that allow the cylindrical portions 4405C and 4406D to be fitted, respectively.
The configuration in which the inner diameter cross-sectional area of the cylindrical portion 4405C and the inner diameter cross-sectional area of the cylindrical portion 4406D are not substantially the same cross-sectional area may be adopted.

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 polarization) A cooling chamber R <b> 2 (see FIG. 18) in which a cooling fluid can be enclosed in a gap between the plate 443 and the plate 443 is formed.
Further, as shown in FIG. 10B, a pressing portion 4406H that is positioned above the cylindrical portion 4406D and protrudes substantially orthogonally from the light incident side end surface is formed on the light incident side end surface. In a state where the frame-shaped member 4406 and the frame-shaped member 4405 are combined, the pressing portion 4406H is inserted into the insertion hole 441E1 of the flexible printed board 441E in the liquid crystal panel 441, and the tip thereof is inserted into the support frame body 4409, which will be described later. Abutting on the periphery of the hole, the support frame 4409 is pressed toward the frame-shaped member 4405 side.
Further, as shown in FIG. 10 (B), the upper end portion and the lower end portion of the light beam incident side end surface are recessed 2 toward the light beam exit side corresponding to the protrusions described later of the support frame 4409. Two notches 4406J are formed respectively. In a state where the frame-shaped member 4406 and the frame-shaped member 4405 are combined, the protruding portion of the support frame 4409 protrudes to the outside via the four notches 4406J.

  Further, in the frame-like member 4406, the upper end portion substantially at the center portion penetrates through the upper side wall of the concave portion 4406E located on the upper side and is substantially orthogonal to the cylindrical portion 4406D, as shown in FIG. Thus, there is formed an outlet 4406I that is connected in communication and through which the cooling fluid inside the cooling chambers R1, R2 (see FIG. 18) flows out. Like the inflow port 4405I, the outflow port 4406I is composed of a substantially cylindrical member having a tube diameter smaller than that of the fluid circulation member 448, and is formed so as to protrude to the outside of the frame-shaped member 4406. ing. A fluid circulation member 448 is connected to the protruding end of the outlet 4406I, flows into the cooling chamber R1 (see FIG. 18) via the inlet 4405I, and further passes through the insertion hole 4405D and the cylindrical portion 4406D. The cooling fluid that has flowed into the cooling chamber R2 (see FIG. 18) via the hole 4406D1 and the cooling fluid that flows into the cooling chamber R2 (see FIG. 18) and further divided by the projecting portion 4405C2 of the cylindrical portion 4405C are cooled into the cooling chamber R2 (see FIG. 18). (Refer to FIG. 2) The cooling fluid flowing into the inside flows out through the fluid circulating member 448.

In the present embodiment, the inner diameter sectional areas of the inlet 4405I and the outlet 4406I are set so as to be substantially the same sectional area as the inner diameter sectional areas of the cylindrical portions 4405C and 4406D. 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 4405I and the outlet 4406I are not limited to the same cross-sectional area as the inner diameter cross-sectional areas of the cylindrical portions 4405C and 4406D, but may be different cross-sectional areas.

Further, in this frame-shaped member 4406, connection portions 4406K for connecting to the frame-shaped member 4405 are respectively formed at the left end corner portion and the right end corner portion as shown in FIG. . Then, screws (not shown) are screwed into the connection portions 4405G and 4406K of the frame-like members 4405 and 4406, so that the liquid crystal panel 441 has a support frame body 4409, a second elastic member and a third elastic member 4407 described later. It is sandwiched between the frame-like members 4405 and 4406 via the elastic member, and the facing surface sides of the respective openings 4405A and 4406A of the frame-like members 4405 and 4406 are sealed.
Furthermore, in this frame-like member 4406, three hooks 4406L similar to the three hooks 4405H of the frame-like member 4405 are formed at the left end and the right end, respectively, 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 and the fourth elastic member 4407D have a substantially rectangular frame shape as shown in FIG. Further, as shown in FIG. 8, the first elastic member 4407A and the fourth elastic member 4407D have a flat end surface facing the pair of frame-like members 4405 and 4406. An end surface facing the side polarizing plate 443 is formed in a curved shape and has a substantially semicircular cross section. The first elastic member 4407A and the fourth elastic member 4407D are installed in the recesses 4405E and 4406B of the frame-like members 4405 and 4406, respectively.

As shown in FIG. 8, the second elastic member 4407B includes an elastic member 4407B1 having a substantially rectangular frame shape in plan view, and an elastic member 4407B2 having a substantially circular shape in plan view located at a substantially central portion of the upper end edge of the elastic member 4407B1. Are integrally formed.
Among these, in the elastic member 4407B1, an elastic member 4407B4 having a substantially circular shape in cross section having a thickness smaller than that of the elastic member 4407B1 is integrally formed at the inner peripheral end as shown in FIG. Has been. The elastic member 4407B1 has an end surface facing the liquid crystal panel 441 formed in a flat shape, an end surface facing the frame-shaped member 4405 formed in a curved shape, and has a substantially semicircular cross section. The elastic members 4407B1 and 4407B4 are disposed so that the curved surface of the elastic member 4407B1 faces the first concave portion 4405B1 of the frame-like member 4405, and are disposed so as to straddle the support frame 4409 and the liquid crystal panel 441.
In addition, the elastic member 4407B2 is formed with an insertion hole 4407B3 through which the cylindrical portion 4406D of the frame-like member 4406 can be inserted at a substantially central portion thereof. This elastic member 4407B2 also has a substantially semicircular cross section in the same manner as the elastic member 4407B1 described above. The elastic member 4407B2 is installed such that the curved surface comes into contact with the second recess 4405B2 of the frame-like member 4405 and the flat surface comes into contact with the support frame 4409.

Further, as shown in FIG. 8, the third elastic member 4407C includes a substantially rectangular frame-like elastic member 4407C1 and a substantially circular elastic member 4407C2 which is located at a substantially central portion of the lower end edge of the elastic member 4407C1. Are integrally formed.
Among these, in the elastic member 4407C1, as shown in FIG. 8, an elastic member 4407C4 having a substantially circular shape in cross section having a thickness smaller than the thickness of the elastic member 4407C1 is integrally formed at the inner peripheral end. Has been. Similarly to the elastic member 4407B1, the elastic member 4407C1 has a flat end surface facing the liquid crystal panel 441, a curved end surface facing the frame member 4406, and a substantially semicircular cross section. is doing. The elastic member 4407C1 and the elastic member 4407C4 are disposed so that the curved surface of the elastic member 4407C1 faces the first concave portion 4406G1 of the frame-like member 4406, and is disposed so as to straddle the support frame 4409 and the liquid crystal panel 441. .
In addition, the elastic member 4407C2 has an insertion hole 4407C3 that allows the cylindrical portion 4405C of the frame-like member 4405 to be inserted at a substantially central portion thereof. This elastic member 4407C2 also has a substantially semicircular cross section, similar to the elastic member 4407C1 described above. The elastic member 4407C2 is installed such that the curved surface is in contact with the second recess 4406G2 of the frame-like member 4406 and the flat surface is in contact with the support frame 4409.

  These elastic members 4407 seal the cooling chambers R1 and R2 (see FIG. 18) of the frame-shaped members 4405 and 4406, and the incident-side polarizing plate 442, the frame-shaped member 4405, the frame-shaped member 4405, and the liquid crystal panel 441. The cooling fluid is prevented from leaking between the liquid crystal panel 441 and the frame-shaped member 4406, the frame-shaped member 4406, and the exit-side polarizing plate 443, and the liquid crystal is connected from the connecting portions of the cylindrical portions 4405C and 4406D and the insertion holes 4406C and 4405D. The cooling fluid is also prevented from leaking to the panel 441 side.

  The elastic member 4407 described above is preferably composed of a rubber member having a hardness Hs (JIS spring type) of 30 to 50. The material is not particularly limited, and examples thereof include silicon rubber, butyl rubber or fluorine rubber having a small moisture permeation amount.

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. Further, on the left and right side edges of these polarizing plate fixing members 4408A and 4408B, three hook engagements projecting substantially orthogonally from the plate surface corresponding to the hooks 4405H and 4406L of the pair of frame-like members 4405 and 4406, respectively. Portions 4408A2 and 4408B2 are respectively formed. Then, the hook engaging portions 4408A2 and 4408B2 of the polarizing plate fixing members 4408A and 4408B are engaged with the hooks 4405H and 4406L of the frame-shaped members 4405 and 4406, so that the polarizing plates are fixed to the frame-shaped members 4405 and 4406. The members 4408A and 4408B are fixed in a state in which the incident side polarizing plate 442 and the emission side polarizing plate 443 are pressed.
The thickness dimension of the polarizing plate fixing members 4408A and 4408B described above preferably has a thickness of 0.3 mm or more, more preferably 0.5 mm. By configuring in this way, the strength of the polarizing plate fixing members 4408A and 4408B can be maintained satisfactorily, and the incident side polarizing plate 442 and the exit side polarizing plate 443 are pressed and fixed well with respect to the pair of frame-like members 4405 and 4406. it can.

FIG. 11 is an exploded perspective view showing a schematic configuration of the support frame 4409. Specifically, it is an exploded perspective view of the support frame 4409 as seen from the light emission side.
FIG. 12 is a view showing a state in which the liquid crystal panel 441 is incorporated in the support frame 4409. Specifically, FIG. 12A is a view of the support frame 4409 as viewed from the light beam emission side. FIG. 12B is a cross-sectional view taken along line CC in FIG. FIG. 12C is a view of the support frame 4409 as viewed from the light beam incident side.
The support frame body 4409 is made of a plate body made of aluminum and having a substantially rectangular shape in plan view. The support frame body 4409 holds the liquid crystal panel 441 and a predetermined position of the light beam emitted from the light source device 411 with respect to the illumination optical axis A. Is to be positioned. As shown in FIG. 8, FIG. 11 or FIG. 12, the support frame 4409 includes a support frame main body 4409A and a support auxiliary portion 4409B.

The support frame body 4409A is a base body that supports the liquid crystal panel 441, and is configured of a plate body that is substantially rectangular in plan view.
In the support frame body 4409A, an opening 4409A1 having substantially the same dimensions as the outer dimensions of the drive substrate 441C of the liquid crystal panel 441 is formed at a substantially central portion thereof as shown in FIG.
Further, in the support frame main body 4409A, as shown in FIG. 11 or FIG. 12C, a bulging portion 4409A2 bulging from the periphery of the opening 4409A1 to the light beam incident side is formed on the end surface of the light beam incident side. .
As shown in FIG. 12A or 12B, the upper end of the bulging portion 4409A2 is formed so as to extend inside the opening 4409A1, that is, on the lower side. Therefore, a stepped portion 4409A3 is formed on the upper side of the inner surface of the opening 4409A1, as shown in FIG. 12A or 12B. Then, as shown in FIG. 12A or 12B, the bottom of the stepped portion 4409A3 is located above the drive substrate 441C in the liquid crystal panel 441 when the liquid crystal panel 441 is incorporated in the support frame 4409. Interferes planarly with the edge. That is, the step portion 4409A3 is in contact with the light beam incident side end surface of the drive substrate 441C and has a function of regulating the position of the liquid crystal panel 441 in the out-of-plane direction.
Further, on the inner side surface of the opening 4409A1, the width dimension of the flexible printed board 441E of the liquid crystal panel 441 is formed in the bulging direction base end portion of the upper side end portion of the bulging portion 4409A2, as shown in FIG. Accordingly, a hole 4409A4 is formed, and in a state where the liquid crystal panel 441 is installed in the support frame 4409, the flexible printed circuit board 441E is inserted into the hole 4409A4.

  Further, on the inner surface of the opening 4409A1, on the bulging portion 4409A2 side, as shown in FIG. 11, FIG. 12 (B), or FIG. 12 (C), a plurality of protrusions protruding inside the opening 4409A1 4409A5 is formed. In the present embodiment, two protrusions 4409A5 are formed on each side edge of the inner surface. Note that the number of protrusions 4409A5 is not limited to the number described above. These protrusions 4409A5 have a function of regulating the position of the liquid crystal panel 441 in the in-plane direction by setting the trajectory connecting the tip portions thereof to the external position reference surface of the counter substrate 441D of the liquid crystal panel 441.

Further, in the support frame main body 4409A, the end surface on the light beam incident side is positioned near the both ends in the left-right direction on the upper side of the bulging portion 4409A2, as shown in FIG. 11 or FIG. Projecting pins 4409A6 are respectively formed.
Furthermore, in the support frame main body 4409A, the upper end corner portion and the lower end corner portion extend upward and downward, respectively, as shown in FIG. Four projecting portions 4409A7 projecting in a planar manner from the side end portions of the pair of frame-like members 4405 and 4406 are formed in a state where the element holding body 4402 is assembled. Further, as shown in FIG. 11 or FIG. 12, attachment holes 4409A8 through which pin-like members (to be described later) of the support member 4403 can be inserted are formed at the tip portions of these protrusions 4409A7.
Further, in the support frame main body 4409A, an insertion hole 4409A9 through which the cylindrical portion 4405C of the frame-like member 4405 can be inserted is formed at a substantially central portion of the lower end portion as shown in FIG. Yes.

The support auxiliary portion 4409B is a portion that is attached to the upper side of the bulging portion 4409A2 on the light beam incident side end face of the support frame main body 4409A and assists the support state of the liquid crystal panel 441 by the support frame main body 4409A. The auxiliary support portion 4409B has a shape corresponding to the upper end portion of the light beam incident side end surface of the support frame main body 4409A, and is composed of a plate body having a substantially rectangular shape in plan view extending in the left-right direction.
As shown in FIG. 11 or FIG. 12C, the support auxiliary portion 4409B is fitted with a pin 4409A6 of the support frame body 4409A through the end surface on the light incident side and the end surface on the light emission side as shown in FIG. A fitting hole 4409B1 that can be formed is formed.
Further, in the support auxiliary portion 4409B, the substantially central portion in the left-right direction of the end surface on the light beam exit side has a width dimension corresponding to the width dimension of the flexible printed circuit board 441E of the liquid crystal panel 441, as shown in FIG. A recess 4409B2 that is recessed on the incident side is formed.
Further, in the auxiliary support portion 4409B, the upper end portion is approximately centered at the upper end as shown in FIG. 11 or 12C, and can be inserted through the cylindrical portion 4406D of the frame-like member 4406. An insertion hole 4409B3 is formed.

Incorporation of the liquid crystal panel 441 into the support frame 4409 described above is performed as follows.
First, the flexible printed circuit board 441E of the liquid crystal panel 441 is inserted into the opening 4409A1 from the light beam emission side of the support frame body 4409A, and is projected from the opening 4409A1 to the outside of the support frame body 4409A through the hole 4409A4. The liquid crystal panel 441 is installed in the opening 4409A1. At this time, the light incident side end surface of the drive substrate 441C is in contact with the step portion 4409A3, the position of the liquid crystal panel 441 in the out-of-plane direction is regulated, and the outer surface of the counter substrate 441D is in contact with the tips of the plurality of protrusions 4409A5. The position of the liquid crystal panel 441 in the out-of-plane direction is restricted, and the liquid crystal panel 441 is positioned with respect to the support frame body 4409A.
Here, the thickness dimension of the support frame body 4409A at the position where the bulging portion 4409A2 is formed is set to be substantially the same as the thickness dimension of the liquid crystal panel 441 as shown in FIG. In addition, the dimension from the light emission side end surface to the bottom of the stepped portion 4409A3 is set to be substantially the same as the thickness dimension of the drive substrate 441C of the liquid crystal panel 441 as shown in FIG. For this reason, in a state where the liquid crystal panel 441 is installed on the support frame body 4409A, as shown in FIG. 12B, the light beam emission side end surface of the support frame body 4409A and the light beam incidence side end surface of the bulging portion 4409A2 The light beam exit side end surface and the light beam incident side end surface of the liquid crystal panel 441 are substantially flush with each other.

After positioning the liquid crystal panel 441 on the support frame body 4409A, the gap between the inner surface of the opening 4409A1 and the outer periphery of the drive substrate 441C, and between the inner surface of the opening 4409A1 and the outer periphery of the counter substrate 441D. A gap formed by the plurality of protrusions 4409A5 is filled with an adhesive having a high elongation rate. Therefore, the liquid crystal panel 441 is positioned and fixed with respect to the support frame body 4409A, and the cooling fluid is prevented from flowing into the liquid crystal panel 441 from the gap.
In addition, as this adhesive agent, what mixed the material which interrupts | blocks the cooling fluid which flows in from the said clearance gap, for example, urethane rubber etc., is preferable. In addition, if an ultraviolet curing type or anaerobic type main ingredient is used as a base, the assembly workability can be improved.

After the liquid crystal panel 441 is positioned and fixed to the support frame main body 4409A, the support auxiliary portion 4409B is attached to the upper side of the bulging portion 4409A2 of the end surface on the light beam incident side of the support frame main body 4409A.
Specifically, the support auxiliary portion 4409B is installed on the support frame main body 4409A so that the pin 4409A6 of the support frame main body 4409A is fitted into the fitting hole 4409B1 of the support auxiliary portion 4409B. At this time, the flexible printed circuit board 441E of the liquid crystal panel 441 protruding through the hole 4409A4 of the support frame main body 4409A is formed between the concave portion 4409B2 of the support auxiliary portion 4409B and the light beam incident side end surface of the support frame main body 4409A. Loosely placed in the space.
Then, the gap between the support frame body 4409A and the support auxiliary portion 4409B is filled with the same adhesive as that used for positioning the liquid crystal panel 441 with respect to the support frame body 4409A, and the support frame body The support auxiliary portion 4409B is fixed to 4409A.
Here, as shown in FIG. 12B, the thickness dimension of the support auxiliary portion 4409B is set to be substantially the same as the height dimension of the bulging portion 4409A2 in the support frame main body 4409A. For this reason, in the state where the support auxiliary portion 4409B is attached to the support frame body 4409A, as shown in FIG. 12B, the light beam incident side end face of the bulging portion 4409A2 and the light flux incident side of the support auxiliary portion 4409B The end face is substantially flush.

  Further, when the support frame body 4409 in which the liquid crystal panel 441 is incorporated is incorporated into the pair of frame-like members 4405 and 4406, the insertion hole 4409A9 of the support frame body 4409A and the insertion hole 4409B3 of the support auxiliary portion 4409B are paired. It functions as a hole for positioning the support frame 4409 with respect to the frame-shaped members 4405 and 4406. That is, by inserting the cylindrical portions 4405C and 4406D of the pair of frame-like members 4405 and 4406 into the insertion holes 4409A9 and 4409B3 of the support frame 4409, respectively, the support frame 4409 is inserted into the pair of frame-like members 4405 and 4406. In other words, the liquid crystal panel 441 is positioned at a predetermined position of the frame-shaped members 4405 and 4406. In a state where the pair of frame-shaped members 4405 and 4406 and the support frame body 4409 are assembled, the opening portions of the first recesses 4405B1 and 4406G1 in the pair of frame-shaped members 4405 and 4406 are end surfaces on the light beam incident side of the support frame body 4409. The liquid crystal panel 441 is closed by the light beam incident side end surface of the counter substrate 441D, the light beam emission side end surface of the support frame 4409, and the light beam emission side end surface of the drive substrate 441C of the liquid crystal panel 441, and the elasticity of the second elastic member 4407B. Elastic member storage portions 4407E for storing the members 4407B1 and 4407B4 and the elastic members 4407C1 and 4407C4 of the third elastic member 4407C are formed (see FIG. 18).

FIGS. 13 and 14 are diagrams showing the structure of the cooling chamber section 4400. FIG. Specifically, FIG. 13 is an exploded perspective view of the cooling chamber section 4400 disposed between the frame-shaped member 4405 and the incident-side polarizing plate 442 as viewed from the light emission side. FIG. 14A is a view of the cooling chamber partitioning portion 4400 disposed between the frame-shaped member 4405 and the incident-side polarizing plate 442 as viewed from the light emission side. FIG. 14B is a cross-sectional view taken along the line DD in FIG. FIG. 14C is a cross-sectional view taken along line E-E in FIG.
As shown in FIG. 8, the two cooling chamber partitions 4400 are disposed between the frame-shaped member 4405 and the incident-side polarizing plate 442 and between the frame-shaped member 4406 and the emission-side polarizing plate 443, respectively. And these two cooling chamber division parts 4400 divide each cooling chamber R1, R2 into two area | regions in the state arrange | positioned in each cooling chamber R1, R2. The two cooling chamber partitions 4400 have the same configuration, and only the cooling chamber partition 4400 disposed between the frame-shaped member 4405 and the incident side polarizing plate 442 will be described below.
As shown in FIG. 13 or FIG. 14, the cooling chamber partition 4400 is composed of a partition body 4400A and a light shielding portion 4400B.

As shown in FIG. 8, the partition portion main body 4400 </ b> A is composed of a translucent member having a substantially rectangular shape in plan view and having an outer dimension slightly smaller than the opening 4405 </ b> A of the frame-like member 4405. As the material of the partition portion main body 4400A, any substrate can be adopted as long as it has translucency. For example, the partition portion main body 4400A may be composed of white plate glass, or the above-described translucent substrates 442A and 443A. Similarly, a white plate / tempered glass (Tempax), sapphire glass, crystal, or YAG may be used.
As shown in FIG. 13 or FIG. 14B, in the partition portion main body 4400A, as shown in FIG. 13 or FIG. . That is, the upper and lower end portions have a shape in which the cross-sectional area becomes smaller toward the vertical direction by the taper portion 4400A1.

As shown in FIG. 13 or FIG. 14, the light shielding portion 4400B is formed of a rectangular frame made of metal such as aluminum or chromium having an opening 4400B1 at a substantially central portion, and shields a predetermined light flux. The light shielding portion 4400B is formed by, for example, pressing.
In the light shielding portion 4400B, the upper and lower end portions and the left and right end portions are overhangs projecting toward the light beam incident side so as to have a shape corresponding to the outer peripheral end portion of the partition portion main body 4400A as shown in FIG. Part 4400B2. Then, the light shielding portion 4400B covers the outer peripheral edge of the partition portion main body 4400A by bringing the inner surface of the overhang portion 4400B2 into contact with the outer peripheral end of the partition portion main body 4400A from the light beam exit side of the partition portion main body 4400A. It is attached. In addition, what is necessary is just to implement attachment of the light-shielding part 4400B with respect to the division part main body 4400A, for example with an adhesive agent.
The light shielding structure of the light beam by the light shielding unit 4400B will be described later.

Then, when assembling the light modulation element holding body 4402, the cooling chamber partitioning section 4400 abuts the outer surfaces of the upper and lower projecting sections 4400B2 of the light shielding section 4400B on the four positioning protrusions 4405K of the frame-shaped member 4405, respectively. The frame-shaped member 4405 is positioned and fixed to the frame-shaped member 4405 with, for example, an adhesive.
Note that the cooling chamber partition 4400 disposed between the frame-shaped member 4406 and the exit-side polarizing plate 443 is disposed between the frame-shaped member 4405 and the incident-side polarizing plate 442 as shown in FIG. It arrange | positions so that the cooling chamber division part 4400 and the both end surfaces of an optical axis direction may become reverse.

  As described above, in the state where the cooling chamber partitioning portion 4400 is disposed in the cooling chamber R1, the light exit side end surface of the incident side polarizing plate 442, the concave portion 4405F, the rectifying portion 4405J, and the upper and lower side end portions of the cooling chamber partitioning portion 4400. Thus, the buffer portion Bf1 (see FIG. 18) that can temporarily store the cooling fluid is formed. Similarly, in the cooling chamber R2, the buffer Bf1 (see FIG. 18) is formed by the light incident side end face of the exit side polarizing plate 443, the concave portion 4406E, the rectifying portion 4406M, and the upper and lower end portions of the cooling chamber partitioning portion 4400. It is formed.

In the present embodiment, the liquid crystal panel 441 and the cooling chamber are larger than the separation dimension D1 (see FIG. 18) between the incident-side polarizing plate 442 and the cooling chamber partition 4400 in a state where the cooling chamber partition 4400 is disposed in the cooling chamber R1. The separation dimension D2 (see FIG. 18) with respect to the partition portion 4400 is set to be large.
Similarly to the above, the cooling chamber partition 4400 disposed in the cooling chamber R2 also has a liquid crystal panel 441 and a cooling chamber partition rather than the separation dimension D1 (see FIG. 18) between the exit-side polarizing plate 443 and the cooling chamber partition 4400. The distance D2 from the portion 4400 (see FIG. 18) is set to be large.
Here, the separation dimension D1 is preferably 0.3 mm to 1.0 mm, and is set to 0.7 mm in the present embodiment. The separation dimension D2 is preferably 1.0 mm to 2.0 mm, and is set to 1.4 mm in this embodiment.
Further, in the present embodiment, each separation dimension D3 (see FIG. 18) between the rectifying units 4405J and 4406M, the incident-side polarizing plate 442 and the emission-side polarizing plate 443 is set to be smaller than the above-described separation dimension D1. ing. In the present embodiment, each separation dimension D3 is set to 0.4 mm.

[Structure of support member]
The support member 4403 is composed 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. The material of the support member 4403 is not particularly limited. For example, the support member 4403 may be made of aluminum, or substantially intermediate between aluminum that is a constituent material of the light modulation element holder 4402 and a constituent material of the cross dichroic prism 444. You may comprise with the iron-type material which has the thermal expansion coefficient of.
As shown in FIG. 5 or FIG. 6, in the support member 4403, the end surface on the light incident side protrudes from the plate at a position corresponding to the four mounting holes 4409 A 8 of the support frame body 4409 in the light modulation element holder 4402. A pin-shaped member 4403A is formed.
The support member 4403 supports the light modulation element holding body 4402 by inserting the pin-shaped member 4403A into the four mounting holes 4409A8 of the light modulation element holding body 4402, and the end surface on the light beam emission side of the plate body is cross dichroic. The light modulation element holding body 4402 is integrated with the cross dichroic prism 444 by being bonded and fixed to the light beam incident side end face of the prism 444.

[Structure of relay tank]
FIG. 15 is a view showing the structure of the relay tank 4404. Specifically, FIG. 15A is a plan view of the relay tank 4404 as viewed from above. FIG. 15B is a cross-sectional view taken along line FF 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 intersecting 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 collectively, and sends out the sent cooling fluid to the exterior.
As shown in FIG. 15, the relay tank 4404 has three cooling fluid inflow portions 4404A that allow the cooling fluid sent from the light modulation element holding bodies 4402 to flow into the relay tank 4404. These cooling fluid inflow portions 4404A are formed of 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 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 delivered from each light modulation element holding body 4402 via 448 flows into the relay tank 4404 at once.

  Further, in this relay tank 4404, on the lower side of the outer side surface, as shown in FIG. 15, a cooling fluid outflow portion 4404B is formed for flowing out the supplied cooling fluid to the outside. 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.

[Radiator structure]
FIG. 16 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. 16A is a perspective view of the radiator 447 and the axial fan 32 as viewed from above. FIG. 16B 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 outer case 2, and in the optical device main body 440, each liquid crystal panel 441, each incident side polarizing plate 442, and each emission side polarized light. The heat of the cooling fluid heated by the plate 443 is radiated. As shown in FIG. 16, the radiator 447 includes a fixing 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. 16B. A tubular member 4472 is provided at the opposite U-shaped end edges. It is configured to be insertable. The fixing portion 4471 supports the plurality of heat radiating fins 4473 at the U-shaped inner surface. An extending 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 extending portion 4471A. A radiator 447 is fixed to the outer case 2.

  The tubular member 4472 is made of aluminum, and extends from one U-shaped tip end edge of the fixing portion 4471 toward the other U-shaped tip end edge as shown in FIG. 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. Further, the tubular member 4472 has a tube diameter smaller than the tube diameter of the fluid circulation member 448, and one end on the upper side shown in FIG. 16B is 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. Further, the other end on the lower side shown in FIG. 16B is connected to the other end of the fluid circulation 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 configured by, for example, a plate body made of a heat conductive member such as metal, and is configured so that the tubular member 4472 can be inserted. 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 such an arrangement state of the plurality of radiating fins 4473, as shown in FIG. 16, 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 pressure sending unit 446 to the fluid branching unit 4401 to each light modulation element holding body 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.

(Cooling structure)
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.
17 and 18 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. 17 is a plan view of the light modulation element holding body 4402 as viewed from the light beam emission side. 18 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 pumped to the fluid branching unit 4401 via the fluid pumping unit 446 and branched by the fluid branching unit 4401 to be stored in each light modulation element holding body 4402. It flows into each cooling chamber R1, R2. At this time, the cooling fluid flowing into the cooling chambers R1 and R2 is temporarily accumulated in each buffer unit Bf1, and then in a direction parallel to the light modulation surface of the liquid crystal panel 441 by the rectifying units 4405J and 4406M. The flow is rectified and rectified to the light beam incident side and the light beam emission side at each inclined surface 4400A2 formed at the lower end of the cooling chamber partition 4400, and is applied to the light beam incident side end surface and the light beam emission side end surface of the cooling chamber partition 4400. Convection along.

Here, the heat generated in the liquid crystal panel 441, the incident-side polarizing plate 442, and the outgoing-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. 18, the heat transferred to the cooling fluid in the cooling chamber R2 proceeds upward in FIG. 18 according to the flow of the cooling fluid, and the upper concave portion 4406E and the rectification in the frame-like member 4406 The portion 4406M guides to a substantially central portion in the left-right direction and moves to the outside of the cooling chamber R2 via the outlet 4406I.
On the other hand, the heat transferred to the cooling fluid in the cooling chamber R1 moves upward in FIG. 18 according to the flow of the cooling fluid, as shown in FIG. Further, the heat moved upward is guided to the substantially central portion in the left-right direction by the upper concave portion 4405F and the rectifying portion 4405J in the frame-like member 4405 according to the flow of the cooling fluid. Then, as shown in FIG. 18, the heat guided to the substantially central portion in the left-right direction moves into the cooling chamber R2 through the insertion hole 4405D and the hole 4406D1 of the cylindrical portion 4406D according to the flow of the cooling fluid. Then, it moves to the outside of the cooling chamber R2 through the outlet 4406I.

The heat moved from the cooling chambers R1 and R2 to the outside of the light modulation element holding body 4402 via the outlet 4406I moves from the relay tank 4404 to the radiator 447 according to 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 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.

[Shading structure]
Next, the light shielding structure of the light beam by the light shielding part 4400B in the cooling chamber partition part 4400 will be described.
FIG. 19 is a diagram for explaining a light blocking structure for a light beam by the light blocking portion 4400B. Specifically, FIG. 19 is an enlarged view of a part of FIG.
As shown in FIG. 19, the light-shielding portion 4400B in the cooling chamber section 4400 disposed inside the cooling chamber R1 passes the illumination light L1 emitted from the light source device 411 and applied to the light modulation surface 441F of the liquid crystal panel 441. It is provided so that the opening end of the opening 4400B1 is located at the boundary position. For this reason, the light beam L2 (for example, each component) having an angle θ (FIG. 19) larger than the incident angle θ1 (FIG. 19) of the illumination light L1 to the light modulation surface 441F is incident from the outer edge side of the light modulation surface 441F. Unnecessary light reflected or scattered by the member is shielded by the light shielding portion 4400B.
Further, as shown in FIG. 19, the light shielding portion 4400B in the cooling chamber partitioning portion 4400 disposed inside the cooling chamber R2 emits an optical image formed on the light modulation surface 441F of the liquid crystal panel 441 to the projection lens 5. It is provided so that the opening end of the opening 4400B1 is located at a boundary position where the image light L3 to be swallowed passes. For this reason, the light beam L4 (for example, the reflected light reflected by the projection lens 5) having an angle θ (FIG. 19) larger than the stagnation angle θ2 (FIG. 19) of the projection lens 5 and incident from the outer edge side of the light modulation surface 441F. Unnecessary light such as light) is shielded by the light shielding portion 4400B.

  In the first embodiment described above, the cooling chamber partitions 4400 are respectively provided in the cooling chambers R1 and R2, and the rectifying portions 4405J and 4406M are formed in the frame-like members 4405 and 4406, respectively. Inside the chamber R1, the buffer Bf1 can be formed by the incident-side polarizing plate 442, the recess 4405F, the rectifying unit 4405J, and the inclined surface 4400A2 of the cooling chamber partition 4400. Similarly, inside the cooling chamber R2, the buffer Bf1 can be formed by the exit-side polarizing plate 443, the recess 4406E, the rectifying unit 4406M, and the inclined surface 4400A2 of the cooling chamber partition 4400. For this reason, the cooling fluid that has flowed into the cooling chambers R1 and R2 through the inlet 4405I is temporarily accumulated in the buffer unit Bf1, and then is rectified on the light modulation surface 441F of the liquid crystal panel 441 by the rectifying units 4405J and 4406M. The flow can be rectified in parallel directions, and can be rectified by the cooling chamber partitioning portion 4400 to the light beam incident side and the light beam emission side of the cooling chamber partitioning portion 4400. Therefore, the flow velocity of the cooling fluid at each position inside the cooling chambers R1 and R2 can be made uniform, and the optical image formed by the liquid crystal panel 441 does not include a streak-like image. The formed optical image can be maintained satisfactorily.

  In addition, by disposing the cooling chamber partition 4400 inside the cooling chambers R1 and R2, the thickness of the cooling fluid layer in contact with the liquid crystal panel 441 in the cooling chambers R1 and R2 can be reduced, and the cooling fluid in contact with the liquid crystal panel 441 The convection speed can be increased. Therefore, the in-plane temperature of the liquid crystal panel 441 can be made uniform, local overheating can be avoided, and a clear optical image can be formed on the liquid crystal panel 441.

Furthermore, since the cooling chamber partitioning portion 4400 is provided with the light shielding portion 4400B, unnecessary light incident from the outside in a plane with respect to the light modulation surface 441F of the liquid crystal panel 441 can be shielded. For this reason, the image formed by the unnecessary light is not included in the optical image formed by the liquid crystal panel 441, and the optical image formed by the liquid crystal panel 441 can be maintained better. In addition, by blocking unnecessary light by the light blocking portion 4400B, a temperature increase of the liquid crystal panel 441 due to irradiation of unnecessary light can be avoided, and deterioration of image quality due to temperature increase can be prevented.
Here, since the light shielding portion 4400B is provided in the cooling chamber partitioning portion 4400 so that the opening end portion of the opening 4400B1 is located at the boundary position where the illumination light L1 and the image light L3 pass, the light shielding portion 4400B is illuminated. Only unnecessary light can be effectively shielded without interfering with the light L1 and the image light L3. In addition, since the cooling chamber partitioning portion 4400 is provided on the light beam incident side and the light beam emission side of the liquid crystal panel 441, it enters from both the light beam incident side and the light beam emission side toward the light modulation surface 441F of the liquid crystal panel 441. Unnecessary light can be blocked. For this reason, the optical image formed by the liquid crystal panel 441 can be maintained even better.
In addition, since the light shielding portion 4400B is attached to the end face side facing the liquid crystal panel 441 in the cooling chamber partition portion 4400, the light shielding portion 4400B faces the incident side polarizing plate 442 and the emission side polarizing plate 443 in the cooling chamber partition portion 4400. The position of the light shielding portion 4400B can be set to a position close to the light modulation surface 441F of the liquid crystal panel 441 as compared with the configuration attached to the side to be mounted. For this reason, the shielding angle of unnecessary light incident on the light modulation surface 441F of the liquid crystal panel 441 can be set large, and unnecessary light can be shielded more reliably.

Here, since the light shielding portion 4400B is formed of a metal rectangular frame, the light shielding portion 4400B can be easily manufactured by, for example, pressing, and the manufacturing cost can be reduced in manufacturing the light shielding portion 4400B.
In addition, since the light shielding portion 4400B is formed of a metal having high specific heat and thermal conductivity, the heat radiation area of the heat generated in the light shielding portion 4400B due to the shielding of unnecessary light can be increased, and the heat exchange capability with the cooling fluid is improved. be able to. For this reason, it is possible to suppress an increase in temperature of the cooling chamber partition 4400, and even when the light shielding portion 4400B is attached only to the surface facing the liquid crystal panel 441 in the cooling chamber partition 4400, the cooling chamber partition 4400 is provided. The temperature difference between the cooling fluids flowing through the light beam incident side and the light beam emission side can be suppressed. Therefore, the in-plane temperature of the liquid crystal panel 441 facing the cooling chamber partition 4400 can be maintained well in a uniform state.

Since the cooling chambers R1 and R2 are sealed by the liquid crystal panel 441, the incident side polarizing plate 442, and the emission side polarizing plate 443, the cooling chambers R1 and R2 are polarized not only by the liquid crystal panel 441 but also by the light beam emitted from the light source device 411. The heat generated in the films 442B and 443B can also be convected to the cooling fluid that convects the cooling chambers R1 and R2.
Further, since not only the liquid crystal panel 441 but also the incident side polarizing plate 442 and the emission side polarizing plate 443 can be integrated with the light modulation element holding body 4402, the cooling performance of these optical elements 441, 442 and 443 can be improved. In addition, downsizing is possible.
In addition, since the projector 1 includes the light modulation element holding body 4402 that can favorably maintain the optical image formed on the liquid crystal panel 441, the projection lens 5 can enlarge and project a clear optical image on the screen. .

[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.
FIG. 20 is an exploded perspective view showing a schematic configuration of the light modulation element holding body 5402 in the second embodiment.
In the present embodiment, as shown in FIG. 20, the shapes of the two cooling chamber partition portions 5400 are changed with respect to the first embodiment. Further, the shape of the frame-shaped members 5405 and 5406 is also changed with the change of the shape of the cooling chamber partitioning portion 5400. The configuration of the light modulation element holder 5402 other than the two cooling chamber partitions 5400 and the frame-shaped members 5405 and 5406 and the configuration other than the light modulation element holder 5402 are the same as those in the first embodiment.

FIG. 21 is a diagram showing the structure of the frame-like members 5405 and 5406. As shown in FIG. Specifically, FIG. 21A is a perspective view of the frame-shaped member 5405 as viewed from the light beam incident side. FIG. 21B is a perspective view of the frame-shaped member 5406 as viewed from the light beam exit side.
As shown in FIG. 21, the frame-shaped members 5405 and 5406 have the same structure as the frame-shaped members 4405 and 4406 described in the first embodiment, except that the rectifying units 4405J and 4406M are omitted. It is only a point. Other structures are the same as those of the frame-like members 4405 and 4406 described in the first embodiment.

22 and 23 are diagrams showing the structure of the cooling chamber partitioning portion 5400. FIG. Specifically, FIG. 22 is an exploded perspective view of the cooling chamber section 5400 disposed on the light beam incident side of the liquid crystal panel 441 as viewed from the light beam emission side. FIG. 23A is a view of the cooling chamber partitioning portion 5400 disposed on the light beam incident side of the liquid crystal panel 441 as viewed from the light beam emission side. FIG. 23B is a cross-sectional view taken along the line HH in FIG. FIG. 23C is a cross-sectional view taken along a line II in FIG.
In addition, the two cooling chamber partition parts 5400 are the same shape, and only the cooling chamber partition part 5400 arrange | positioned between the frame-shaped member 5405 and the incident side polarizing plate 442 is demonstrated below.
As shown in FIG. 22 or FIG. 23, the cooling chamber partitioning part 5400 includes a partitioning part body 5400A and an extension part 5400B. In addition, the cooling chamber partition part 5400 can employ | adopt the material similar to the cooling chamber partition part 4400 demonstrated in the said 1st Embodiment.

The partition portion main body 5400A has a shape substantially similar to the shape of the cooling chamber partition portion 4400 described in the first embodiment, and is a portion facing the liquid crystal panel 441 in a state of being disposed inside the cooling chamber R1. . As shown in FIG. 22 or FIG. 23, the partition unit body 5400A is divided into a first partition unit 5400A1 located on the light beam exit side and a second partition unit 5400A2 located on the light beam incident side.
As shown in FIG. 22 or FIG. 23, the second partition portion 5400A2 is configured by a plate having a rectangular shape in plan view. Further, as shown in FIG. 22 or FIG. 23, a concave portion 5400A3 corresponding to the outer shape of the incident-side polarizing plate 442 is formed on the end surface of the second partition portion 5400A2 on the light beam exit side.
Further, as shown in FIG. 22 or FIG. 23, the first partition portion 5400A1 is configured by a plate body having a rectangular shape in plan view, substantially the same as the second partition portion 5400A2.
In the first partition portion 5400A1, a tapered portion 5400A4 having an inclined surface 5400A5 having a chamfered corner portion on the end surface facing the liquid crystal panel 441 is formed at the upper and lower end portions as shown in FIG. Has been. That is, the upper and lower side end portions have a shape in which the cross-sectional area becomes smaller in the vertical direction by the taper portion 5400A4.

  Further, in the first partition portion 5400A1, the stepped portion 5400A6 that can be fitted into the concave portion 5400A3 of the second partition portion 5400A2 is formed on the end surface on the light beam incident side as shown in FIG. 23B or FIG. Is formed. In a state where the step portion 5400A6 is fitted to the recess 5400A3 and the first partition portion 5400A1 and the second partition portion 5400A2 are combined, a space is formed between the first partition portion 5400A1 and the second partition portion 5400A2, The incident side polarizing plate 442 is disposed in the space. When the incident-side polarizing plate 442 is disposed in the space, an adhesive or water glass is applied to the end surfaces of the first partition portion 5400A1 and the second partition portion 5400A2 that come into contact with each other, and the cooling fluid is applied to the space from the outside. Is prevented from flowing in.

Further, in the first partition portion 5400A1, a metal material such as aluminum or chromium is deposited on the light emission side end face and the outer peripheral end portion by vapor deposition, as shown in FIG. 22 or FIG. 23, and the opening 5400A8. A light-shielding portion 5400A7 is formed.
The light shielding portion 5400A7 has the same function as the light shielding portion 4400B described in the first embodiment, and shields a predetermined light flux. The shape of the light shielding portion 5400A7 is substantially the same as that of the light shielding portion 4400B described in the first embodiment. That is, the light-shielding portion 5400A7 of the cooling chamber partitioning portion 5400 disposed on the light beam incident side of the liquid crystal panel 441 is emitted from the light source device 411 and is applied to the light modulation surface 441F (FIG. 19) of the liquid crystal panel 441. 19) is provided so that the opening end of the opening 5400A8 is located at the boundary position through which it passes. Further, the light shielding portion 5400A7 of the cooling chamber partitioning portion 5400 disposed on the light emission side of the liquid crystal panel 441 emits an optical image formed on the light modulation surface 441F of the liquid crystal panel 441 and is imaged into the projection lens 5. It is provided so that the opening end of the opening 5400A8 is located at the boundary position where L3 (FIG. 19) passes.

As shown in FIG. 22 or FIG. 23, the extension portion 5400B is formed integrally with the second partition portion 5400A2, extends vertically from the upper and lower ends of the second partition portion 5400A2, and is disposed inside the cooling chamber R1. In this state, it is a portion facing the concave portion 4405F of the frame-shaped member 5405.
In these extending portions 5400B, as shown in FIG. 22 or FIG. 23, the extending direction end portions are inclined surfaces in which only corner portions on the end surface side facing the liquid crystal panel 441 are chamfered, as in the first partition portion 5400A1. A tapered portion 5400B1 having 5400B2 is formed. That is, these extending portions 5400B also have a shape in which the cross-sectional area becomes smaller in the up-down direction due to the tapered portion 5400B1, similarly to the first partition portion 5400A1.
Further, in these extending portions 5400B, as shown in FIG. 22 or FIG. 23, the end portions in the extending direction have a substantially central portion in the left-right direction (portion facing the outlet 4406I or the inlet 4405I) in the vertical direction (outlet). 4406I side or inflow port 4405I side). In the present embodiment, since the shape of the upper recess 4405F and the shape of the lower recess 4405F are different, the shape of the upper extension 5400B is different from the shape of the lower extension 5400B. However, you may form so that it may become the same shape.

As shown in FIG. 23B, the cooling chamber partitioning portion 5400 has a light flux incident side end surface of the second partitioning portion 5400A2 and a light flux incident side end surface of the extending portion 5400B that are substantially flush with each other. Has a planar shape. In the assembled state of the cooling chamber compartment 5400, as shown in FIG. 23B, the thickness of the compartment body 5400A is larger than the thickness of the extension 5400B by the thickness of the first compartment 5400A1. The first partition 5400A1 has a shape that bulges toward the liquid crystal panel 441.
The cooling chamber partitioning portion 5400 disposed on the light emission side of the liquid crystal panel 441 has the same configuration, and is formed by the first partitioning portion 5400A1 and the second partitioning portion 5400A2 constituting the cooling chamber partitioning portion 5400. An exit-side polarizing plate 443 is disposed in the space. Further, the cooling chamber partitioning portion 5400 disposed on the light emission side of the liquid crystal panel 441 is disposed such that both end surfaces in the optical axis direction are opposite to the cooling chamber partitioning portion 5400 disposed on the light flux incidence side of the liquid crystal panel 441. Is done.

FIG. 24 and FIG. 25 are diagrams for explaining a state in which cooling chamber partitioning portions 5400 are respectively arranged in cooling chambers R1 and R2. Specifically, FIG. 24 is a view of the light modulation element holding body 5402 as seen from the light emission side. 25 is a cross-sectional view taken along line JJ in FIG.
When the cooling chamber partition portion 5400 is disposed in the cooling chambers R1 and R2, the inclined surface 5400A5 at the upper and lower end portions of the first partition portion 5400A1 constituting the partition portion main body 5400A is framed as in the first embodiment. Each of the cooling chamber partitions 5400 is positioned on the frame-shaped members 5405 and 5406 by abutting against the positioning protrusions 4406K and 4406N of the frame-shaped members 5405 and 5406, respectively. For example, an adhesive or the like is used for the frame-shaped members 5405 and 5406. Each cooling chamber partition 5400 is fixed.
In addition, the incident-side polarizing plate 442 and the emission-side polarizing plate 443 are arranged in the two cooling chamber partitions 5400, respectively, so that the light beam incident side of the frame-shaped member 5405 and the light beam emission side of the frame-shaped member 5406 are As shown in FIG. 25, translucent substrates 5407A and 5407B are respectively disposed.
And in the state which has arrange | positioned the cooling chamber partition part 5400 in cooling chamber R1, as shown in FIG. 25, the light emission exit side end surface of the translucent board | substrate 5407A, the recessed part 4405F, and the extension part in the cooling chamber partition part 5400 A buffer portion Bf2 that allows the cooling fluid to be temporarily stored is formed by the end portion in the extending direction of 5400B. Similarly, in the cooling chamber R2, the buffer portion Bf2 is formed by the light incident side end surface of the translucent substrate 5407B, the concave portion 4406E, and the end portion in the extending direction of the extending portion 5400B in the cooling chamber partitioning portion 5400. .

  In the present embodiment, as in the first embodiment, the separation dimension D1 between the cooling chamber partitioning portion 5400 and the translucent substrates 5407A and 5407B with the cooling chamber partitioning portion 5400 disposed in the cooling chamber R1 ( The distance D2 (FIG. 25) between the liquid crystal panel 441 and the partition body 5400A in the cooling chamber partition 5400 is set to be larger than that in FIG. Here, the separation dimension D1 is preferably 0.3 mm to 1.0 mm. In the present embodiment, the separation dimension D1 is set to 0.7 mm as in the first embodiment. The separation dimension D2 is preferably set to 1.0 mm to 2.0 mm. In the present embodiment, the separation dimension D2 is set to 1.4 mm as in the first embodiment.

  In the second embodiment described above, compared with the first embodiment, the rectifying sections 4405J and 4406M are omitted from the frame-shaped members 5405 and 5406, respectively, and each cooling chamber partition section 5400 is flat with the recesses 4405F and 4406E. So as to interfere with each other. Then, the buffer part Bf2 is formed by the translucent substrate 5407A (the translucent substrate 5407B), the recess 4405F (the recess 4406E), and the extending direction end of the extending part 5400B in the cooling chamber partition part 5400. Further, the extending direction end portion having the tapered portion 5400B1 in the extending portion 5400B has a convex curved surface shape in which a substantially central portion in the left-right direction protrudes in the up-down direction. As a result, after the cooling fluid that has flowed in through the inlet 4405I is temporarily accumulated in the buffer portion Bf2, the cooling fluid is transferred to the liquid crystal panel due to the convex curved shape at the end in the extending direction of the extending portion 5400B. Rectification can be performed in a direction parallel to the light modulation surface 441 (left-right direction). For this reason, the cooling fluid can be rectified in both the direction parallel to and perpendicular to the liquid crystal panel 441 by the tapered portion 5400B1 and the convex curved surface shape of the extending portion 5400B. Therefore, even if the rectifying units 4405J and 4406M are omitted, the cooling chamber partitioning unit 5400 can equalize the flow velocity of the cooling fluid at each position inside the cooling chambers R1 and R2, and is formed by the liquid crystal panel 441. The obtained optical image can be maintained satisfactorily. In addition, since the flow velocity of the cooling fluid at each position inside the cooling chambers R1 and R2 can be made uniform, the in-plane temperature of the liquid crystal panel 441 can be made uniform, and local overheating can be avoided. And a clear optical image can be formed. Further, since the rectifying units 4405J and 4406M can be omitted, the structure of the frame-shaped members 5405 and 5406 can be simplified, and the manufacture of the frame-shaped members 5405 and 5406 is facilitated.

Further, since the light shielding portion 5400A7 is formed of a metal thin film, the thickness dimension of the cooling chamber partitioning portion 5400 is not changed even when the light shielding portion 5400A7 is deposited on the partitioning portion main body 5400A. Therefore, when setting the separation dimensions D1 and D2, it is not necessary to consider the thickness dimension of the light shielding part 5400A7, and the cooling chamber partition part 5400 can be easily manufactured.
Furthermore, the partition section main body 5400A that constitutes each cooling chamber partition section 5400 is divided into two sections, a first partition section 5400A1 and a second partition section 5400A2, and is incident-side polarized light on each recess section 5400A3 of each second partition section 5400A2. Since the plate 442 and the exit side polarizing plate 443 are disposed, both the light incident side and the light exit side of the incident side polarizing plate 442 and the exit side polarizing plate 443 can be cooled by the cooling fluid via the cooling chamber partitioning part 5400. Further, the cooling efficiency of the incident side polarizing plate 442 and the emission side polarizing plate 443 can be further improved.

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 the first embodiment, the cooling chambers R1 and R2 are formed in the frame members 4405 and 4406, respectively, but the present invention is not limited to this. For example, a configuration in which the cooling chamber is formed only in any one of the frame-like members 4405 and 4406 may be employed. The same applies to the second embodiment. That is, since only one cooling chamber is formed in the light modulation element holders 4402 and 5402, only one cooling chamber partitioning section 4400 and 5400 is formed, and the cooling chamber section is included in the cooling chamber. Parts 4400 and 5400 are arranged.
In each of the above embodiments, the cooling chambers R1 and R2 are connected to each other through the hole 4405C1 of the cylindrical portion 4405C, the insertion hole 4406C, the hole 4406D1 of the cylindrical portion 4406D, and the insertion hole 4405D. For example, you may employ | adopt the structure which does not connect each cooling chamber R1, R2 in communication. In this case, each frame-shaped member 4405, 4406, 5405, 5406 is provided with an inflow port and an outflow port, respectively.

  In the first embodiment, as shown in FIG. 19, the openings 4400B1 of the light shielding portions 4400B in the cooling chamber partitioning portions 4400 respectively disposed in the cooling chambers R1 and R2 have substantially the same dimensions. Although illustrated, it is not limited to this. That is, as described above, the opening end portion of the opening 4400B1 of the light shielding portion 4400B disposed on the light beam incident side of the liquid crystal panel 441 is set to the boundary position through which the illumination light L1 passes, and on the light beam emission side of the liquid crystal panel 441. Since the opening end portion of the opening portion 4400B1 of the light shielding portion 4400B to be arranged is set at a boundary position through which the image light L3 passes, each opening portion 4400B1 may have a different size.

In the first embodiment, the light shielding portion 4400B of the cooling chamber partitioning portion 4400 is composed of a metal rectangular frame. You may comprise.
Similarly, in the second embodiment, the light shielding portion 5400A7 of the cooling chamber partitioning portion 5400 is formed of a metal thin film. You may comprise by a rectangular frame.
In each of the above embodiments, the light shielding portions 4400B and 5400A7 are made of a metal material. However, the present invention is not limited to this, and any material may be adopted as long as it has a light shielding property.
In the second embodiment, the light shielding portion 5400A7 is formed by vapor deposition. However, the present invention is not limited to this, and the light shielding portion 5400A7 may be formed by printing or painting with a paint thin film.

  In the respective embodiments, the formation positions of the inlet 4405I and the outlet 4406I in the light modulation element holding body 4402 and the flow direction of the cooling fluid are not limited to the formation positions and the flow directions described in the respective embodiments. For example, the flow direction of the cooling fluid may be reversed so that the inlet 4405I and the outlet 4406I function as an outlet and an inlet, respectively.

  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 the first embodiment, the incident-side polarizing plate 442 and the emission-side polarizing plate 443 are disposed on the outer surfaces of the pair of frame-shaped members 4405 and 4406, and the light-transmitting substrates of the incident-side polarizing plate 442 and the emission-side polarizing plate 443 are arranged. Each of the cooling chambers R1 and R2 is closed by 442A and 443A. However, the present invention is not limited to this. Good. At this time, the incident-side polarizing plate and the exit-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 the light source can be suppressed without cooling the incident side polarizing plate and the emission side polarizing plate with a cooling fluid.
In addition, although the configuration in which the incident-side polarizing plate 442 and the emission-side polarizing plate 443 are cooled with a cooling fluid is adopted, the present invention is not limited to this, and a phase difference plate or a viewing angle correction plate is used as a pair of frame-like members 4405 and 4406. The structure which arrange | positions on the outer surface of these and cools these may be employ | adopted.
In the second embodiment, the configuration in which the incident-side polarizing plate 442 and the emission-side polarizing plate 443 are arranged in each cooling chamber partition portion 5400 has been described. However, the present invention is not limited to this, and a retardation plate or a viewing angle correction plate is provided. You may employ | adopt the structure arrange | positioned in the cooling chamber division part 5400. FIG. The cooling chamber partitioning portion 5400 has a configuration in which optical conversion elements such as an incident side polarizing plate 442, an emission side polarizing plate 443, a phase difference plate, or a viewing angle correction plate are arranged alone, and a plurality of optical conversion elements. A configuration may be adopted in which these are arranged in a lump.
It is of course possible to adopt a structure in which the incident-side polarizing plate 442 and the emission-side polarizing plate 443 are removed from each cooling chamber partition portion 5400 and placed on the light-transmitting substrates 5407A and 5407B, respectively.

In the first embodiment, the rectifying portions 4405J and 4406M formed in the frame-shaped members 4405 and 4406 are formed in the vicinity of the inflow port 4405I and the outflow port 4406I, respectively, but not limited thereto, at least the inflow port 4405I. As long as it is formed in the vicinity. The shape of the rectifying units 4405J and 4406M is not limited to the shape described in the first embodiment, and the cooling fluid temporarily accumulated in the buffer unit Bf1 is parallel to the light modulation surface of the liquid crystal panel 441. Other shapes may be used as long as the shape can be expanded.
In the respective embodiments, the shape of the cooling chamber partitioning parts 4400 and 5400 is not limited to the shape described in the respective embodiments. For example, the slopes 4400A2, 5400A5, 5400B2 may be formed in a curved shape instead of a flat shape.
In the respective embodiments, the arrangement positions of the cooling chamber partitioning parts 4400 and 5400 are not limited to the arrangement positions described in the respective embodiments. For example, a configuration may be employed in which the cooling chamber partitions 4400 and 5400 are disposed between the frame-shaped members 4405 and 5405 and the liquid crystal panel 441, and between the liquid crystal panel 441 and the frame-shaped members 4406 and 5406, respectively.

  In each of the above embodiments, the fluid circulating member 448, the main tank 445, the fluid pumping portion 446, the tubular member 4472 of the radiator 447, the frame-shaped members 4405, 4406, 5405, 5406, and the relay tank 4404, which are members that come into contact with the cooling fluid. The support frame 4409 is made of an aluminum member, but is 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, the support frame 4409 does not have to be made of the same material as the frame-like members 4405, 4406, 5405, 5406, and may be made of a material other than aluminum. In particular, if the support member 4403 is made of the same material (for example, iron), the expansion coefficient can be made substantially the same, and the influence on pixel shift due to temperature change can be minimized. Further, as the fluid circulation member 448, butyl rubber or fluorine rubber having a low deformation reaction force to the light modulation element holding body 4402 and a low hardness for suppressing pixel shift may be used.

In each of the above embodiments, the flow rate of the cooling fluid flowing into each light modulation element holding body 4402 is set to be substantially the same, but this is not limiting, and the cooling fluid flowing into each light modulation element holding body 4402 You may employ | adopt the structure which makes a flow volume different.
For example, a configuration may be employed in which a valve is provided in a flow path flowing from the fluid branching portion 4401 to each light modulation element holding body 4402 and the flow path is narrowed or widened by changing the position of the valve.
Further, for example, a configuration is adopted in which each fluid circulation member 448 that connects the fluid branch portion 4401 and each light modulation element holding body 4402 has a different tube diameter according to the amount of heat generated by each liquid crystal panel 441R, 441G, 441B. May be.

  In each of the above embodiments, the outer surface of the light modulation element holding body 4402 and the bottom surface of the optical component housing 45 are cooled by the blowing of the sirocco fan 31. However, the present invention is not limited thereto, and the sirocco fan 31 may be omitted. The object of the present invention can be sufficiently achieved. Such a configuration can contribute to noise reduction.

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.

  The light modulation element holding body of the present invention can maintain an optical image formed by the light modulation element while cooling the light modulation element efficiently with a cooling fluid, so that the projector used in home theaters and presentations can be used. It is useful as a light modulation element holder.

FIG. 2 is a diagram schematically illustrating a schematic configuration of a projector according to the first embodiment. The perspective view which looked at a part in the projector in the said embodiment from the upper side. 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 disassembled perspective view which shows schematic structure of the support frame in the said embodiment. The figure which shows the state which incorporated the liquid crystal panel in the support frame in the said embodiment. The figure which shows the structure of the cooling chamber division part in the said embodiment. The figure which shows the structure of the cooling chamber division part 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 light-shielding structure of the light beam by the light-shielding part in the said embodiment. The disassembled perspective view which shows schematic structure of the light modulation element holding body in 2nd Embodiment. The figure which shows the structure of the frame-shaped member in the said embodiment. The figure which shows the structure of the cooling chamber division part in the said embodiment. The figure which shows the structure of the cooling chamber division part in the said embodiment. The figure for demonstrating the state which has each arrange | positioned the cooling chamber division part in the cooling chamber in the said embodiment. The figure for demonstrating the state which has each arrange | positioned the cooling chamber division part in the cooling chamber in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 5 ... Projection optical apparatus, 44 ... Optical apparatus, 411 ... Light source device, 441, 441R, 441G, 441B ... Liquid crystal panel, 441F ... Light modulation surface, 442 ... Incident side polarizing plate (optical conversion element), 442A ... Translucent substrate, 443 ... Emission side polarizing plate (optical conversion element), 443A ... Translucent substrate, 443B ... Polarized light Film (optical conversion film), 448 ... fluid circulation member, 4400, 5400 ... cooling chamber partitioning part, 4400B, 5407A7 ... light shielding part, 4402, 5402 ... light modulation element holder, 4405, 4406 , 5405, 5406 ... frame-like member, 4405A, 4406A ... opening, 4405I ... inlet, 4406I ... outlet, 5407 ... translucent substrate, L1 ... illumination light, L2 ... image light, R1, R2 ··· cooling chamber.

Claims (10)

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, and the light is cooled by the cooling fluid in the cooling chamber. A light modulation element holder for cooling the modulation element,
At least one of a pair of frame-shaped members each having an opening formed in accordance with a light modulation surface of the light modulation element and sandwiching the light modulation element, and a surface opposite to the facing surface of the pair of frame-shaped members Including a translucent substrate disposed on the surface side,
In the cooling chamber, at least one of the facing surface side and the surface opposite to the facing surface in the opening of the pair of frame-shaped members is the light modulation element and the translucent substrate. By being respectively closed, it is formed inside at least one of the pair of frame members,
At least one of the pair of frame-shaped members includes an inlet that allows the cooling fluid to flow into the cooling chamber, an outlet that allows the cooling fluid inside the cooling chamber to flow outside, The light modulation element is formed of a plate-like member having a shape larger than the light modulation surface in a plane and having translucency. And a cooling chamber partition section partitioned into
The light modulation element holding body, wherein the cooling chamber partitioning portion is provided with a light shielding portion for shielding an incident light beam so as to surround the light modulation surface in a plane. The light modulation element holder according to claim 1,
The light-shielding portion is disposed at a boundary position where illumination light emitted from the light source and irradiated on a light modulation surface of the light modulation element and / or an optical image emitted from the light modulation surface of the light modulation element passes. The light modulation element holding member is provided in the cooling chamber partitioning portion so that the opening end of the light shielding portion is positioned. In the light modulation element holder according to claim 1 or 2,
The cooling chamber is formed inside each of the pair of frame members,
The cooling chamber partition is provided on a light beam incident side and a light beam emission side of the light modulation element, respectively. In the light modulation element holder according to any one of claims 1 to 3,
The light-shielding element holding member, wherein the light-shielding part is provided on the facing surface side in the cooling chamber partition part. In the light modulation element holder according to any one of claims 1 to 4,
The light-shielding element holding member is constituted by a thin film deposited on the cooling chamber partition. In the light modulation element holder according to any one of claims 1 to 4,
The light-shielding part is composed of a frame-like member that surrounds the light-modulation surface in a plane, and is attached to the cooling chamber partition part. In the light modulation element holding body according to any one of claims 1 to 6,
The cooling chamber partition is formed by laminating a plurality of plate-like members,
At least one optical conversion element that converts an optical characteristic of an incident light beam is interposed between at least one of the plurality of plate-like members. 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 holding body according to any one of claims 1 to 7, connected to an inlet and an outlet of the light modulation element holding body, guiding the cooling fluid to the outside of the cooling chamber, An optical device comprising: a plurality of fluid circulation members that lead to the inside of the cooling chamber. The optical device according to claim 8.
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.
The optical device, wherein the light transmissive substrate constituting the light modulation element holding body is a light transmissive substrate constituting the optical conversion element.   A projector comprising: a light source device; an optical device according to claim 8; and a projection optical device that enlarges and projects an optical image formed by the optical device.

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