JP5310625B2 - projector - Google Patents

Description

  The present invention relates to a projector.

Conventionally, there has been known a projector including a light source device, a light modulation element that modulates a light beam emitted from the light source device according to image information to form image light, and a projection optical device that enlarges and projects the image light. Yes.
And in such a projector, the structure which cools optical elements, such as a light modulation element, with a cooling liquid is proposed (for example, refer patent document 1).
The projector described in Patent Document 1 includes an optical element holding body that allows a cooling liquid to flow therein and holds an optical element, a liquid pumping unit that forcibly circulates the cooling liquid, and a radiator. Each of these members is connected by a plurality of liquid circulation members to form an annular flow path for circulating the cooling liquid. The heat generated in the optical element is transmitted to the cooling liquid through the optical element holder. The heat transferred to the cooling liquid is dissipated when the cooling liquid flows through the radiator.

JP 2007-41412 A

  However, since the projector described in Patent Document 1 employs a radiator as a means for radiating the heat of the cooling liquid, it is difficult to effectively reduce the temperature of the cooling liquid. That is, since the optical element is cooled by the cooling liquid having a relatively high temperature, it is difficult to effectively cool the optical element.

  An object of the present invention is to provide a projector capable of effectively cooling an optical element.

A projector, which is a related technology of the present invention , is a projector including a liquid cooling device that cools an optical element with a cooling liquid, and the liquid cooling device is configured to allow the cooling liquid to flow therein. An optical element holding unit that holds the optical element so as to be able to transmit, a liquid pumping unit that sucks and pumps cooling liquid, and the optical element holding unit and the liquid pumping unit are connected to form a flow path for the cooling liquid. The projector includes a plurality of liquid circulation members and a heat receiving jacket disposed in the flow path and having a plurality of fine flow paths through which the cooling liquid flows, and the projector includes a plurality of thermoelectric elements having a heat absorption surface and a heat dissipation surface. A plurality of thermoelectric conversion elements, wherein the heat absorption surface is connected to the heat receiving jacket so as to be able to transfer heat; and the heat absorption surface is capable of transferring heat to the liquid pumping unit. Characterized in that it comprises a second thermoelectric conversion element that continues, the.

In the related art , the projector includes a thermoelectric conversion element such as a Peltier element that is connected to the liquid cooling device in a state in which the heat absorption surface is capable of transferring heat to the cooling liquid. The heat of the liquid can be effectively absorbed from the endothermic surface, and the temperature of the cooling liquid can be effectively reduced. For this reason, the optical element can be cooled by the cooling liquid having a sufficiently low temperature, and the optical element can be effectively cooled. Therefore, thermal deterioration of the optical element can be avoided and the life of the projector can be extended.
Further, in the conventional configuration, for example, increasing the pump performance of the liquid pumping unit, it is conceivable to improve the cooling efficiency of the optical element by increasing the flow velocity of the cooling liquid circulating in the related art, described above Thus, since the cooling efficiency of the optical element can be improved by using the thermoelectric conversion element, it is not necessary to improve the pump performance of the liquid pumping section, and the degree of freedom in selecting the liquid pumping section can be improved.
Furthermore, in the conventional configuration, for example, it is conceivable to reduce the temperature of the cooling liquid by increasing the size of the radiator to increase the heat radiation efficiency. However, in the related technology , as described above, the thermoelectric conversion element is used. Since the temperature of the cooling liquid can be effectively reduced, it is not necessary to increase the size of the radiator. Further, even if the radiator is omitted, the same effect can be obtained and the projector can be reduced in size.

In the related technology , the first thermoelectric conversion element is connected to a heat receiving jacket such as a so-called microchannel having a plurality of fine flow paths inside and having a large surface area in contact with the cooling liquid so that heat can be transferred. To do. Thus, the heat of the cooling liquid can be absorbed more effectively from the heat absorbing surface of the first thermoelectric conversion element via the heat receiving jacket, and the temperature of the cooling liquid can be more effectively reduced.

Further, in the above related technology , the heat absorption surface of the second thermoelectric conversion element is connected to the liquid pumping portion so as to be able to transfer heat, so that the cooling liquid absorbed from the heat absorption surface of the second thermoelectric conversion element via the liquid pumping portion. Is stirred inside the liquid pumping unit. For this reason, the temperature of the cooling liquid inside the liquid pumping unit can be reduced uniformly, and the temperature of the circulating cooling liquid can be made uniform.
The projector of the present invention is a projector including a first liquid cooling device that cools an optical element with a cooling liquid, and the first liquid cooling device is configured to allow the cooling liquid to flow therein. An optical element holding unit that holds the optical element so as to be able to transfer heat, a first liquid pumping unit that sucks and pumps a cooling liquid, and an optical element holding unit and the first liquid pumping unit that are connected to each other for cooling. A plurality of first liquid circulation members that form a first flow path of liquid, and a heat receiving jacket that is disposed in the first flow path and has a plurality of fine flow paths through which cooling liquid flows. The projector includes a second liquid pumping unit, a radiator, and a plurality of second liquid circulation members, and is cooled by the second liquid pumping unit, the radiator, and the plurality of second liquid circulation members. Forms a second flow path for liquid The second liquid cooling device has a heat absorbing surface and a heat radiating surface, the heat absorbing surface is connected to the heat receiving jacket so as to be able to transfer heat, and the heat radiating surface is capable of transferring heat to the second liquid pumping portion. And a thermoelectric conversion element to be connected.

In the projector according to the aspect of the invention, the optical element includes a red light modulation element, a green light modulation element, and a blue light modulation element that modulate red light, green light, and blue light according to image information, respectively. The holding unit includes a red light modulation element holding unit, a green light modulation element holding unit, and a blue light modulation element holding unit corresponding to the red light modulation element, the green light modulation element, and the blue light modulation element. The liquid circulation member preferably connects the red light modulation element holding part, the green light modulation element holding part, and the blue light modulation element holding part in series in the flow path.
Here, when the light modulation element holding portions are connected in series by the liquid circulation member, the connection order of the light modulation element holding portions may be any connection order.

In the present invention, the liquid circulation member connects the light modulation element holding portions in series in the flow path of the cooling liquid.
Accordingly, for example, compared to a configuration in which each light modulation element holding portion is connected in parallel with the liquid circulation member, the cooling liquid inflow side or the outflow side in the liquid circulation member is set according to each light modulation element holding portion. There is no need for a branched structure, the structure of the liquid circulation member can be simplified, and the liquid cooling device can be simplified.
In addition, when connecting each light modulation element holding part in series, a light modulation element holding part holding a light modulation element whose temperature rise is larger than that of other light modulation elements is arranged on the upstream side of the flow path. If the light modulation element holding part that holds the light modulation element with a small rise is disposed on the downstream side of the flow path, the light modulation element with the large temperature rise is cooled in order, so that each liquid cooling device can be simplified, The light modulation element can be efficiently cooled.

In the projector according to the aspect of the invention, it is preferable that the optical element includes an air cooling device having a cooling fan that blows cooling air.
In the present invention, in addition to the cooling structure using the liquid cooling device and the thermoelectric conversion element, the optical element can be further effectively cooled by using the air cooling device.

FIG. 2 is a perspective view showing an internal structure of the projector according to the first embodiment. The figure which shows the apparatus main body in 1st Embodiment. The figure which shows the apparatus main body in 1st Embodiment. The top view which shows typically the optical system of the optical unit in 1st Embodiment. The figure for demonstrating the structure of the air cooling apparatus in 1st Embodiment. The figure for demonstrating the structure of the air cooling apparatus in 1st Embodiment. The figure for demonstrating the structure of the liquid cooling device and thermoelectric conversion unit in 1st Embodiment. The figure for demonstrating the structure of the liquid cooling device and thermoelectric conversion unit in 1st Embodiment. The figure which shows the structure of the optical element holding | maintenance part in 1st Embodiment. The figure which shows the structure of the optical element holding | maintenance part in 1st Embodiment. The figure which shows the structure of the liquid distribution part in 1st Embodiment. Sectional drawing which shows typically the internal structure of the 1st heat receiving jacket in 1st Embodiment. The figure for demonstrating the structure of the thermoelectric conversion unit in 1st Embodiment. The figure which showed typically the structure of the liquid cooling apparatus and thermoelectric conversion unit in 1st Embodiment. The figure which showed typically the structure of the liquid cooling device and thermoelectric conversion unit in 2nd Embodiment. The figure which showed typically the structure of the liquid cooling apparatus and thermoelectric conversion unit in 3rd Embodiment.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Schematic configuration of projector]
FIG. 1 is a perspective view showing the internal structure of the projector 1 in the first embodiment. Specifically, FIG. 1 is a perspective view of the projector 1 as viewed from the upper front side.
Note that “upper”, “lower”, “left”, and “right” described below correspond to up, down, left, and right in the drawing view of FIG. In addition, “front” and “back” described below correspond to the front and back in the drawing view of FIG.
The projector 1 modulates a light beam emitted from a light source according to image information to form image light, and enlarges and projects the formed image light on a screen (not shown). As shown in FIG. 1, the projector 1 includes an exterior casing 2 that constitutes an exterior, and an apparatus main body 3 that is disposed inside the exterior casing 2.

As shown in FIG. 1, the exterior housing 2 has a top surface portion (not shown in FIG. 1), a bottom surface portion 21, a front surface portion 22, a back surface portion 23, a left side surface portion 24, and a right side surface portion 25, and has a rectangular parallelepiped shape. Have
In the exterior housing 2, an air inlet 251 having a rectangular shape in plan view is formed on the front surface side of the right side surface portion 25. Further, an exhaust port 252 having a rectangular shape in plan view is formed on the back side of the intake port 251.

2 and 3 are views showing the apparatus main body 3. Specifically, FIG. 2 is a perspective view of the apparatus main body 3 as viewed from the upper front side. FIG. 3 is a perspective view of the apparatus main body 3 as seen from the front lower side.
As shown in FIG. 2 or 3, the apparatus main body 3 includes an optical unit 4, an air cooling device 5, a liquid cooling device 6, and a thermoelectric conversion unit 7.
Although not specifically illustrated, a power supply unit that supplies power to each constituent member of the projector 1 and each constituent member of the projector 1 are provided in a space other than the respective members 4 to 7 in the exterior casing 2. A control device or the like for controlling the operation is arranged.

[Configuration of optical unit]
FIG. 4 is a plan view schematically showing the optical system of the optical unit 4.
The optical unit 4 forms image light according to image information under the control of the control device. The optical unit 4 extends from the left side to the right side along the back surface of the exterior housing 2 and the front end portion in the extending direction is the front surface. It has a substantially L-shape in plan view that is bent and extends to the side.
As shown in FIG. 4, the optical unit 4 includes a light source device 41 having a light source lamp 411 and a reflector 412, an illumination optical device having lens arrays 421 and 422, a reflection mirror 423, a polarization conversion element 424, and a superimposing lens 425. 42, a color separation optical device 43 having dichroic mirrors 431 and 432, and a reflection mirror 433, a relay optical device 44 having an incident side lens 441, a relay lens 443, and reflection mirrors 442 and 444, and a light modulation element (optical) Three liquid crystal panels 451 (elements) (the red light side liquid crystal panel as the red light modulation element 451R, the green light side liquid crystal panel as the green light modulation element 451G, and the blue light side as the blue light modulation element) (The liquid crystal panel is assumed to be 451B.) Three incident side polarizing plates 452, three exits It includes an optical device 45 having a cross dichroic prism 454 as a polarizing plate 453, and the color combining optical device, an optical component casing 46, a projection lens 47 as a projection optical device.
In the optical unit 4, the light beam emitted from the light source device 41 and passing through the illumination optical device 42 is separated into three color lights of R, G, and B by the color separation optical device 43 with the above-described configuration. Each separated color light is modulated by each liquid crystal panel 451 in accordance with image information, and image light for each color light is formed. The image light for each color light is combined by the cross dichroic prism 454 and enlarged and projected on the screen (not shown) by the projection lens 47.
The optical components 41 to 45 and 47 described above are used as an optical system for various general projectors, and therefore will not be described in detail. Hereinafter, the configuration of the optical component casing 46 will be described. Will be explained.

As shown in FIG. 2 or FIG. 3, the optical component casing 46 has a substantially L shape in plan view, and a predetermined illumination optical axis A (FIG. 4) is set therein, and each of the optical components 41 described above. ˜45 are arranged at predetermined positions with respect to the illumination optical axis A. The optical component casing 46 includes a component storage member 461 and a lid-like member 462.
The component storage member 461 includes a light source device storage portion 4611 and a component storage portion main body 4612.
The light source device storage portion 4611 is located on one end side of the L-shape of the optical component housing 46 and is formed in a container shape having an opening on the left side. Then, the light source device 41 is stored in the light source device storage portion 4611 through the opening.

The component storage unit main body 4612 is formed in a container shape having an opening (not shown) on the upper side. The component storage unit main body 4612 stores the optical components 42 to 44 in order from one end side connected to the light source device storage unit 4611 through the opening, and the other end side opposite to the one end side. The optical device 45 is housed in In addition, a projection lens 47 is attached to the side of the component storage unit main body 4612 that faces the optical device 45.
In the component storage unit main body 4612, openings 4612R, 4612G, and 4612B (FIG. 3) are formed on the lower end surface at positions corresponding to the arrangement positions of the liquid crystal panels 451R, 451G, and 451B constituting the optical device 45, respectively. Has been.

The lid-like member 462 is a member that closes the upper opening of the component storage unit main body 4612, and has a planar shape that is substantially the same as the planar shape of the component storage unit main body 4612.
A U-shaped notch 4621 (FIG. 2) is formed in the lid-like member 462 so as to surround the optical device 45 in a plane corresponding to the arrangement position of the optical device 45.

[Configuration of air cooling device]
5 and 6 are diagrams for explaining the configuration of the air cooling device 5. FIG. Specifically, FIG. 5 is a perspective view of the air cooling device 5, the liquid cooling device 6, and the thermoelectric conversion unit 7 as viewed from the front upper side. FIG. 6 is a perspective view of the air cooling device 5, the liquid cooling device 6, and the thermoelectric conversion unit 7 as seen from the lower front side.
The air cooling device 5 blows air to a later-described radiator 63 constituting the optical device 45 and the liquid cooling device 6 to forcibly cool the optical device 45 and the radiator 63. As shown in FIG. 5 or FIG. 6, the air cooling device 5 includes an intake duct 51, a pair of sirocco fans 52 and 53 (FIG. 6) as cooling fans, an air duct 54, and an axial fan 55. .

  The intake duct 51 is formed in a rectangular parallelepiped shape having an opening 511 on the right side surface, and is disposed in the exterior housing 2 so that the opening 511 is connected to the intake port 251 (FIG. 1). In addition, although not shown in the lower end surface of the intake duct 51, a pair of openings for allowing the air inside to flow out are formed on the front side and the back side, respectively. The intake duct 51 introduces air introduced from the outside of the exterior housing 2 through the intake port 251 into the inside through the opening 511, and has a pair of openings formed on the lower end surface. To flow downward.

  The pair of sirocco fans 52 and 53 are attached to the lower end face of the intake duct 51 with the discharge ports 521 and 531 (FIG. 6) facing left and the suction ports (not shown) facing upward. In this state, each of the pair of sirocco fans 52 and 53 is connected to a pair of openings formed on the lower end face of the intake duct 51 at each suction port (not shown). The pair of sirocco fans 52 and 53 sucks air outside the exterior housing 2 through the air inlet 251 and the air intake duct 51 and discharges the air from the outlets 521 and 531 to the left side.

The air duct 54 extends from the lower side of the arrangement position of the optical device 45 in two toward the discharge ports 521 and 531, and the tip portions are connected to the discharge ports 521 and 531.
Further, on the upper side end face of the air duct 54, three outflow portions projecting upward and corresponding to the three openings 4612R, 4612G, 4612B of the optical component casing 46, and the internal air flows out. 541 is formed.
Then, the air duct 54 flows out the air discharged from the pair of sirocco fans 52 and 53 from the lower side to the upper side through the respective outflow portions 541. The air through the air duct 54 is introduced into the optical component casing 46 through the three openings 4612R, 4612G, and 4612B of the optical component casing 46, and the members 451 to 415 of each color light side in the optical device 45 are provided. It distribute | circulates between 453 toward upper direction from the downward direction, and each member 451-453 is cooled. The air after cooling the members 451 to 453 is discharged to the outside of the optical component casing 46 through the notch 4621 of the lid-like member 462.

  The axial fan 55 is disposed opposite to the exhaust port 252 with the radiator 63 interposed therebetween, and discharges the sucked air toward the radiator 63 to cool the radiator 63. Then, the air through the radiator 63 is discharged from the exhaust port 252 to the outside of the exterior housing 2.

[Configuration of liquid cooling device]
7 and 8 are diagrams for explaining the configuration of the liquid cooling device 6 and the thermoelectric conversion unit 7. Specifically, FIG. 7 is a perspective view of the liquid cooling device 6 and the thermoelectric conversion unit 7 as seen from the upper front side. FIG. 8 is a perspective view of the liquid cooling device 6 and the thermoelectric conversion unit 7 as seen from the front lower side.
The liquid cooling device 6 circulates a cooling liquid such as water or ethylene glycol along the annular flow path, and cools the liquid crystal panel 451 as an optical element with the cooling liquid. As shown in FIG. 7 or FIG. 8, the liquid cooling device 6 includes three optical element holding units 61, a liquid pumping unit 62, a radiator 63, a first heat receiving jacket 64, a second heat receiving jacket 65, and a plurality of units. The liquid circulation member 66 is provided.

The plurality of liquid circulation members 66 are configured by tubular members that allow the cooling liquid to flow therein, and connect the members 61 to 65 to form an annular flow path.
In addition, the connection structure of each member 61-65 by the liquid circulation member 66 is mentioned later.

[Configuration of optical element holder]
9 and 10 are diagrams illustrating the structure of the optical element holding unit 61. FIG. Specifically, FIG. 9 is a perspective view of the optical element holding unit 61 as viewed from the light beam incident side. FIG. 10 is a perspective view of the optical element holding unit 61 as viewed from the light beam exit side.
The three optical element holding units 61 hold the three liquid crystal panels 451, and the cooling liquid flows in and out of the three liquid crystal panels 451. The three liquid crystal panels 451 are cooled by the cooling liquid. Each optical element holding unit 61 has the same configuration, and only one optical element holding unit 61 will be described below. As shown in FIG. 9 or FIG. 10, the optical element holding part 61 includes a liquid circulation part 611, an optical element support frame 612, and a frame member 613 (FIG. 10).

FIG. 11 is a diagram illustrating the structure of the liquid circulation unit 611. Specifically, FIG. 11 is a perspective view of the liquid circulation part 611 as viewed from the light beam exit side.
The liquid circulation part 611 is located on the light beam incident side of the optical element holding part 61 and causes the cooling liquid to circulate inside. As shown in FIG. 11, the liquid circulation unit 611 includes a liquid circulation pipe 6111 and an attachment member 6112.
The liquid flow pipe 6111 is formed in a rectangular frame shape in plan view surrounding the image forming area (light transmission area) of the liquid crystal panel 451, and each end for allowing the cooling liquid to flow in and out extends in parallel to the upper side. Is formed.
The mounting member 6112 is formed of a rectangular plate in plan view having a rectangular opening 6112A corresponding to the image forming area of the liquid crystal panel 451.
In the mounting member 6112, a concave portion 6112 </ b> B corresponding to the shape of the liquid circulation pipe 6111 is formed on the end surface on the light beam exit side. The liquid circulation pipe 6111 is fitted into the recess 6112B and is connected to the attachment member 6112 so as to be able to transfer heat.

Although not specifically shown, the optical element support frame 612 has a rectangular opening corresponding to the image forming area of the liquid crystal panel 451 and supports the liquid crystal panel 451 on the light beam emission side.
In the optical element support frame 612, a concave portion 6121 (FIG. 9) corresponding to the shape of the liquid flow tube 6111 is formed on the end surface on the light beam incident side. The liquid circulation pipe 6111 is fitted into the recess 6121 in a state where the attachment member 6112 is connected to the light incident side end face of the optical element support frame 612 so as to be able to transfer heat, and is connected to the optical element support frame 612 so as to be able to transfer heat. .
Further, in the optical element support frame 612, although not specifically illustrated on the light beam exit side, the liquid crystal panel 451 corresponding to the outer shape (stepped shape) of the liquid crystal panel 451 is accommodated in the peripheral portion of the opening. A concave portion to be held is formed, and the concave portion is connected to the liquid crystal panel 451 so that heat can be transferred.

The frame member 613 is a bendable sheet-like member, and has a rectangular opening 6131 (FIG. 10) corresponding to the image forming area of the liquid crystal panel 451. The frame member 613 is attached so as to straddle the optical element support frame 612 and the liquid crystal panel 451, as shown in FIG. Although the optical element support frame 612 and the liquid crystal panel 451 are connected so that heat can be transmitted, the optical element support frame 612 and the liquid crystal panel 451 also transmit heat through the frame member 613. Connect as possible.
The frame member 613 may be a sheet-like member that is formed of a heat conductive material and can be bent. For example, a metal member or a graphite sheet can be employed.

[Configuration of liquid pumping section]
The liquid pumping unit 62 is a pump that sucks and pumps the cooling liquid, and circulates the cooling liquid along the annular flow path.
The liquid pumping unit 62 has, for example, a configuration in which an impeller is disposed in a hollow member, and sucks and pumps the cooling liquid as the impeller rotates.
In addition, as a structure of the liquid pumping part 62, you may employ | adopt other structures, such as not only the continuous delivery type | mold structure which has the impeller mentioned above but the intermittent delivery type | mold using a diaphragm.

[Configuration of radiator]
The radiator 63 is disposed inside the exterior housing 2 so as to face the exhaust port 252 (FIG. 1), and radiates the heat of the cooling liquid circulating along the annular flow path. As shown in FIG. 7 or 8, the radiator 63 includes a pair of liquid storage portions 631 and 632 and a radiator main body 633.
The pair of liquid storage portions 631 and 632 is configured by a substantially rectangular parallelepiped hollow member.
The radiator body 633 is interposed between the pair of liquid storage portions 631 and 632. The radiator main body 633 has a structure in which the liquid accumulators 631 and 632 communicate with each other through a plurality of flow paths through which the cooling liquid can flow, although not specifically illustrated. The air can be circulated.
That is, when the cooling liquid flows through the plurality of flow paths in the radiator main body 633, the heat of the cooling liquid is transmitted to the radiator main body 633. In addition, air discharged from the axial fan 55 flows between the flow paths, and the radiator main body 633 is cooled.

[Configuration of heat receiving jacket]
FIG. 12 is a cross-sectional view schematically showing the internal structure of the first heat receiving jacket 64. Specifically, FIG. 12 is a cross-sectional view taken along line XII-XII in FIG.
Since each of the heat receiving jackets 64 and 65 has the same configuration, only the first heat receiving jacket 64 will be described below.
The 1st heat receiving jacket 64 is comprised with the substantially rectangular parallelepiped hollow member, and receives heat from the cooling liquid which distribute | circulates an inside.
Inside the first heat receiving jacket 64, as shown in FIG. 12, a plurality of plate bodies 641 extending along the flow direction of the cooling liquid are arranged side by side in a direction perpendicular to the flow direction. Specifically, these plate bodies 641 have a thickness dimension of, for example, about several tens of μm to several hundreds of μm, and are arranged with an interval of about several tens of μm to several hundreds of μm.
With the above configuration, a plurality of fine flow paths Cm through which the cooling liquid flows between the plate bodies 641 are formed in the first heat receiving jacket 64. That is, the first heat receiving jacket 64 is configured by a so-called heat exchanger such as a microchannel.

[Configuration of thermoelectric conversion unit]
FIG. 13 is a diagram for explaining the configuration of the thermoelectric conversion unit 7. Specifically, FIG. 13 is an exploded perspective view in which a part of the thermoelectric conversion unit 7 is disassembled and viewed from below.
The thermoelectric conversion unit 7 is disposed above the intake duct 51 and absorbs heat from the cooling liquid flowing through the heat receiving jackets 64 and 65. As shown in FIG. 7, FIG. 8, or FIG. 13, the thermoelectric conversion unit 7 includes a support member 71, four Peltier elements 72 (FIG. 13) as thermoelectric conversion elements, and two heat radiation side heat transfer members 73. (FIG. 13), an air guide member 74 (FIGS. 7 and 8), and a sirocco fan 75 (FIGS. 7 and 8).

The support member 71 is formed of a plate body having a rectangular shape in plan view, and integrates two heat receiving jackets 64 and 65, four Peltier elements 72, two heat radiation side heat transfer members 73, and an air guide member 74. The support member 71 is made of a material having low thermal conductivity (for example, 0.9 W / (m · K) or less).
As shown in FIG. 13, the support member 71 has a rectangular shape smaller than the planar shape of each of the heat receiving jackets 64 and 65 on the front side and the back side, and allows two Peltier elements 72 to be fitted. Openings 711 are respectively formed.
The heat receiving jackets 64 and 65 are respectively fixed to the peripheral edge portions of the openings 711 on the upper end surface of the support member 71.

Although not specifically shown, the Peltier element 72 has a plurality of junction pairs configured by joining a p-type semiconductor and an n-type semiconductor with metal pieces, and the plurality of junction pairs are electrically directly connected. It is connected to the.
In the Peltier element 72 having such a configuration, when power is supplied, as shown in FIG. 13, one end face (upper end face) of the Peltier element 72 becomes a heat absorbing surface 721 that absorbs heat, The end surface (lower end surface) is a heat radiating surface 722 that radiates heat.
The Peltier element 72 is fitted into the opening 711 of the support member 71, and the heat absorbing surface 721 is connected to the lower side end surfaces of the heat receiving jackets 64 and 65 so that heat can be transferred.

As shown in FIG. 13, the two heat radiating side heat transfer members 73 have the same configuration, and are a rectangular plate body 731, and a plurality of protrusions that protrude from the lower end surface of the plate body 731 and extend in the front-rear direction. It is constituted by a so-called heat sink having a fin member 732. Then, each heat radiation side heat transfer member 73 is fixed to the peripheral edge portion of each opening 711 on the lower end surface of the support member 71. In this state, each heat radiation side heat transfer member 73 is connected to the heat radiation surface 722 of each Peltier element 72 so that heat can be transferred.
That is, in a state where the heat receiving jackets 64 and 65, the Peltier elements 72, and the heat radiation side heat transfer members 73 are integrated by the support member 71, the heat reception jackets 64 and 65 to the Peltier elements 72 to the heat dissipation side heat transfer elements. A heat transfer path of the heat member 73 is formed.

The air guide member 74 is formed in a substantially U-shaped cross section extending in the front-rear direction, and is fixed to the lower end surface of the support member 71 so that each heat-radiating side heat transfer member 73 is positioned in the U-shaped inner portion. . That is, the air guide member 74 forms a cylindrical space between the support member 71 and air in the front-rear direction.
The sirocco fan 75 is disposed on the front side of the air guide member 74 and discharges the sucked air toward a cylindrical space formed by the support member 71 and the air guide member 74.

[Connection structure with liquid circulation member]
FIG. 14 is a diagram schematically showing the configuration of the liquid cooling device 6 and the thermoelectric conversion unit 7.
Next, a connection structure of the members 61 to 65 by the liquid circulation member 66 will be described.
In the following, for convenience of explanation, of the three optical element holding units 61, the optical element holding unit holding the red light side liquid crystal panel 451R will be referred to as the red light modulation element holding unit 61R, and the green light side liquid crystal panel 451G. The optical element holding unit that holds the green light modulation element holding unit 61G and the optical element holding unit that holds the blue light side liquid crystal panel 451G are called the blue light modulation element holding unit 61B.
As shown in FIG. 7, FIG. 8, or FIG. 14, the liquid circulation member 66 includes seven members, that is, first to seventh liquid circulation members 66 </ b> A to 66 </ b> G.
Specifically, the inflow side and the outflow side of the first liquid circulation member 66A are respectively connected to one end of each liquid circulation pipe 6111 in the green light modulation element holding part 61G and the blue light modulation element holding part 61B.
The second liquid circulation member 66B has an inflow side connected to the other end of the liquid circulation pipe 6111 in the blue light modulation element holding part 61B, and an outflow side of one end of the liquid circulation pipe 6111 in the red light modulation element holding part 61R. Connected to.

The third liquid circulation member 66C has an inflow side connected to the other end of the liquid circulation pipe 6111 in the red light modulation element holding unit 61R, and an outflow side connected to the liquid pumping unit 62.
The fourth liquid circulation member 66D is connected to the liquid pumping section 62 and the radiator 63 (liquid storage section 631) on the inflow side and the outflow side.
The fifth liquid circulation member 66E has an inflow side and an outflow side connected to the radiator 63 (liquid accumulation unit 632) and the first heat receiving jacket 64, respectively.
The sixth liquid circulation member 66F is connected to the heat receiving jackets 64 and 65 on the inflow side and the outflow side.
The seventh liquid circulation member 66G has an inflow side connected to the second heat receiving jacket 65 and an outflow side connected to the other end of the liquid circulation pipe 6111 in the green light modulation element holding portion 61G.

  By the connection structure by the liquid circulation member 66 as described above, the green light modulation element holding part 61G to the blue light modulation element holding part 61B to the red light modulation element holding part 61R to the liquid pumping part 62 to the radiator 63 to the first heat receiving jacket 64. -An annular flow path C that follows the second heat receiving jacket 65 and returns to the green light modulation element holding portion 61G is formed again.

Then, the liquid cooling device 6 and the thermoelectric conversion unit 7 described above cool the liquid crystal panel 451 as described below.
That is, heat generated in the liquid crystal panel 451 is transmitted to the cooling liquid via the optical element holding unit 61.
The heat transferred to the cooling liquid is transferred to the radiator main body 633 when the cooling liquid circulates along the annular flow path C and flows through the plurality of flow paths in the radiator 63 (the radiator main body 633). The heat transmitted to the radiator body 633 is radiated by the air discharged from the axial fan 55 and flowing between the plurality of flow paths.
The heat transferred to the cooling liquid is transferred to the heat receiving jackets 64 and 65 when the cooling liquid circulates along the annular flow path C and flows through the plurality of fine flow paths Cm of the heat receiving jackets 64 and 65. Is done. The heat transmitted to each of the heat receiving jackets 64 and 65 follows the heat transfer path of each of the heat receiving jackets 64 and 65 to each of the Peltier elements 72 to each of the heat radiation side heat transfer members 73, and through each fin member 732 sirocco fan 75. The heat is radiated by the air that is discharged from the air and flows through the cylindrical space formed by the support member 71 and the air guide member 74.
The cooling liquid is cooled to a temperature lower than the environmental temperature by radiating heat in stages by the radiator 63 and the heat receiving jackets 64 and 65.

The first embodiment described above has the following effects.
In the present embodiment, the projector 1 includes the Peltier element 72 that is connected to the liquid cooling device 6 in a state in which the heat absorbing surface 721 is capable of transferring heat to the cooling liquid. Can be effectively absorbed from the endothermic surface 721, and the temperature of the cooling liquid can be effectively reduced. For this reason, the liquid crystal panel 451 can be cooled by the cooling liquid having a sufficiently low temperature (below the environmental temperature), and the liquid crystal panel 451 can be effectively cooled. Therefore, thermal deterioration of the liquid crystal panel 451 can be avoided and the life of the projector 1 can be extended.

In addition, since the cooling efficiency of the liquid crystal panel 451 can be improved by using the Peltier element 72, it is not necessary to employ the liquid pumping unit 62 having high pump performance, and the liquid pumping unit 62 that circulates the cooling liquid at the minimum necessary flow rate is provided. The degree of freedom in selecting the liquid pumping unit 62 can be improved.
Furthermore, since the cooling liquid cooled by the radiator 63 is cooled by the Peltier element 72, the Peltier element 72 can be efficiently cooled without increasing the power consumption.
Further, since the temperature of the cooling liquid can be effectively reduced by using the Peltier element 72, it is not necessary to increase the size of the radiator 63, and the radiator 63 having the minimum size can be employed. Can be achieved.

  Further, the Peltier element 72 has a plurality of fine flow paths Cm inside, and a heat receiving surface 721 is heated by heat receiving jackets 64 and 65 composed of a heat exchanger such as a so-called microchannel having a large surface area in contact with the cooling liquid. Connect to communicate. Thus, the heat of the cooling liquid can be absorbed more effectively from the heat absorbing surface 721 of the Peltier element 72 via the heat receiving jackets 64 and 65, and the temperature of the cooling liquid can be reduced more effectively.

Further, the liquid circulation member 66 is arranged in the order of the green light modulation element holding part 61G, the blue light modulation element holding part 61B, and the red light modulation element holding part 61R in the annular flow path C along the flow direction of the cooling liquid. Connect in series.
Accordingly, for example, compared to the configuration in which the optical element holding portions 61 are connected in parallel by the liquid circulation member 66, the inflow side or the outflow side of the liquid circulation member 66 is branched according to the optical element holding portions 61. The structure of the liquid circulation member 66 can be simplified and the liquid cooling device 6 can be simplified.
In addition, a green light modulation element holding portion 61G that holds a liquid crystal panel 451G that has a large temperature rise compared to the other liquid crystal panels 451R and 451B is disposed on the upstream side of the flow path to hold the liquid crystal panel 451R that has a small temperature rise. By disposing the red light modulation element holding portion 61R on the downstream side of the flow path, the liquid crystal panel 451G having a large temperature rise is cooled in order, so that each liquid crystal panel 451 can be efficiently used while simplifying the liquid cooling device 6. Can be cooled.

  Further, the projector 1 includes an air cooling device 5. Thereby, in addition to the cooling structure using the liquid cooling device 6 and the thermoelectric conversion unit 7, the liquid crystal panel 451 can be more effectively cooled by using the air cooling device 5.

[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. 15 is a diagram schematically showing the configuration of the liquid cooling device 6 and the thermoelectric conversion unit 7 in the second embodiment.
As shown in FIG. 15, the present embodiment differs from the first embodiment in that the second heat receiving jacket 65 is omitted and the liquid pumping unit 62 is disposed at the position where the second heat receiving jacket 65 is disposed. Only. Other configurations are the same as those in the first embodiment.

Specifically, the liquid pumping unit 62 in the present embodiment is configured by a continuous delivery type pump having a configuration in which an impeller is disposed in a hollow member made of a heat conductive material such as aluminum.
In this embodiment, as shown in FIG. 15, each Peltier element 72 of the thermoelectric conversion unit 7 has an endothermic surface 721 on the lower end surface of the liquid pumping unit 62 in addition to the lower end surface of the first heat receiving jacket 64. Connect to allow heat transfer.

According to the second embodiment described above, there are the following effects in addition to the same effects as in the first embodiment.
In the present embodiment, since the heat absorption surface 721 of the Peltier element 72 is connected to the liquid pumping unit 62 so as to be able to transfer heat, the cooling liquid absorbed from the heat absorption surface 721 of the Peltier element 72 via the liquid pumping unit 62 In the part 62, it will be stirred. For this reason, the temperature of the cooling liquid inside the liquid pumping unit 62 can be reduced uniformly, and the temperature of the circulating cooling liquid can be made uniform.

[Third embodiment]
Next, 3rd 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. 16 is a diagram schematically showing the configuration of the liquid cooling device 6 and the thermoelectric conversion unit 7 in the third embodiment.
In this embodiment, the thermoelectric conversion unit 7 is provided with a second liquid cooling device 76 as shown in FIG. 16, omitting each heat-radiating side heat transfer member 73, the air guide member 74, and the sirocco fan 75. Other configurations are the same as those in the first embodiment.

In the second liquid cooling device 76, the liquid pumping unit 761 and the radiator 762 are connected by a plurality of liquid circulation members 66 to form an annular flow path C ′.
Here, the liquid pumping unit 761 is the same as the liquid pumping unit 62 described in the second embodiment, and is connected to the heat radiation surface 722 of each Peltier element 72 so that heat can be transferred.
The radiator 762 is the same as the radiator 63 that constitutes the liquid cooling device 6.
That is, in the present embodiment, the heat following the heat transfer path of each of the heat receiving jackets 64 and 65 to each of the Peltier elements 72 is transmitted to the liquid pumping unit 761. The heat transmitted to the liquid pumping unit 761 is transmitted to a cooling liquid such as water or ethylene glycol that circulates along the annular flow path C ′, and is radiated when flowing through the radiator 762.

According to 3rd Embodiment mentioned above, there exist the following effects other than the effect similar to the said 1st Embodiment and the said 2nd Embodiment.
In the present embodiment, the thermoelectric conversion unit 7 includes a second liquid cooling device 76. As a result, compared to the configuration described in the first embodiment, heat can be effectively radiated from the heat radiating surface 722 of the Peltier element 72, and a cooling target (each heat receiving jacket) with respect to the power consumption of the Peltier element 72. 64, 65), it is possible to improve the ratio (endothermic ratio) of the amount of heat absorbed. For this reason, the temperature of the circulating cooling liquid can be further reduced.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In each of the embodiments described above, the liquid cooling device 6 includes the radiator 63. However, the present invention is not limited thereto, and the object of the present invention can be sufficiently achieved even if the radiator 63 is omitted.
In each of the above embodiments, the heat absorbing surface 721 of the Peltier element 72 is connected to the heat receiving jackets 64 and 65 and the liquid pumping unit 62 so as to be able to transfer heat, but the heat absorbing surface 721 is connected in a state where heat can be transferred to the cooling liquid. For example, you may connect to other members, for example, 61, 63, 66 etc. so that heat transfer is possible.

In each said embodiment, although the four Peltier elements 72 were provided, the number is not specifically limited, For example, one may be sufficient. The same applies to the heat receiving jackets 64 and 65 and the heat radiation side heat transfer member 73.
In each of the embodiments, the liquid crystal panel 451 is employed as the optical element to be cooled. However, the present invention is not limited to this, and the light source device 41, the polarization conversion element 424, the incident side polarizing plate 452, the emission side polarizing plate 453, and the like. Other optical elements may be cooled.
In each said embodiment, the structure of the air-cooling apparatus 5 is not restricted to the structure demonstrated in the said each embodiment. For example, in each of the above-described embodiments, the pair of sirocco fans 52 and 53 is employed, but an axial fan may be employed.

In each of the embodiments, each optical element holding unit 61 is arranged in the order of the green light modulation element holding unit 61G, the blue light modulation element holding unit 61B, and the red light modulation element holding unit 61R along the flow direction of the cooling liquid. Although the first to third liquid circulation members 66A to 66C are connected in series, the connection order is not limited to this.
For example, the blue light modulation element holding unit 61B, the green light modulation element holding unit 61G, and the red light modulation element holding unit 61R may be connected in series in the flow direction of the cooling liquid.
The present invention also includes a configuration in which the light modulation element holding portions 61R, 61G, and 61B are connected in parallel in addition to a configuration in which the light modulation element holding portions 61R, 61G, and 61B are connected in series. Therefore, for example, the blue light modulation element holding unit 61B and the red light modulation element holding unit 61R are connected in series along the flow direction of the cooling liquid, and the blue light modulation element holding unit 61B and the red light modulation element holding unit 61R The green light modulation element holding unit 61G may be connected in parallel.

In each of the above embodiments, the light source device 41 is not limited to the configuration described in each of the above embodiments, and various solid light emitting elements such as a laser diode, an LED (Light Emitting Diode), an organic EL (Electro Luminescence) element, and a silicon light emitting element. You may comprise.
In each of the above embodiments, the projector 1 is configured as a three-plate projector including three liquid crystal panels 451. However, the projector 1 is not limited to this, and may be configured as a single-plate projector including one liquid crystal panel. . Moreover, you may comprise as a projector provided with two liquid crystal panels, or a projector provided with 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 above embodiments, a liquid crystal panel is used as the light modulation device, but a light modulation device other than liquid crystal, such as a device using a micromirror, may be used.
In each of the above embodiments, only an example of a front type projector that projects from the direction of observing the screen has been described. However, the present invention also applies to a rear type projector that projects from the side opposite to the direction of observing the screen. Applicable.

  Since the optical element can be effectively cooled, the present invention can be used for projectors used in presentations and home theaters.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 5 ... Air cooling device, 6 ... Liquid cooling device, 52, 53 ... Sirocco fan (cooling fan), 61, 61R, 61G, 61B ... Optical element holding | maintenance part, 62 ... liquid pumping section, 64, 65 ... heat receiving jacket, 66 ... liquid circulation member, 72 ... Peltier element (thermoelectric conversion element), 451, 451R, 451G, 451B ... liquid crystal panel (optical) Element), 721 ... endothermic surface, 722 ... heat dissipation surface, C ... flow path, Cm ... fine flow path.

Claims (3)

A projector comprising a first liquid cooling device for cooling an optical element with a cooling liquid,
The first liquid cooling device includes:
An optical element holding unit configured to be capable of circulating a cooling liquid therein, and holding the optical element so as to be able to transfer heat with the cooling liquid;
A first liquid pumping unit for sucking and pumping cooling liquid;
A plurality of first liquid circulation members that connect the optical element holding unit and the first liquid pumping unit to form a first flow path of cooling liquid;
A heat receiving jacket disposed in the first flow path and having a plurality of fine flow paths in which a cooling liquid flows;
The projector
Second liquid pumping unit, the radiator, and a plurality of second liquid circulation member, said second liquid pumping unit, the radiator, and a second cooling liquid by said plurality of second liquid circulation member A second liquid cooling device in which a flow path is formed;
A thermoelectric conversion element having a heat absorption surface and a heat dissipation surface, wherein the heat absorption surface is connected to the heat receiving jacket so as to be able to transfer heat, and the heat dissipation surface is connected to the second liquid pumping portion so as to be able to transfer heat. Characteristic projector. The projector according to claim 1 , wherein
The optical element includes a red light modulation element, a green light modulation element, and a blue light modulation element that modulate red light, green light, and blue light according to image information,
The optical element holding unit includes a red light modulation element holding unit, a green light modulation element holding unit, and a blue light modulation element holding unit corresponding to the red light modulation element, the green light modulation element, and the blue light modulation element. Consisting of
The projector is characterized in that the liquid circulation member connects the red light modulation element holding part, the green light modulation element holding part, and the blue light modulation element holding part in series in the flow path. In the projector according to claim 1 or 2 ,
A projector comprising an air cooling device having a cooling fan for blowing cooling air to the optical element.

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