Cooling device and projection-type image display device including the same

Abstract

To provide a space-saving cooling device and a projection-type image display device including the same.SOLUTION: A cooling device (1) includes: a sealed housing (3) accommodating a first heating element; a first radiator (5) placed outside the housing (3); a first blower (7) that sends the wind to the first radiator (5); and a heat dissipation part (9) that is placed outside of the housing (3) so that the wind from the first blower (7) flows thereto, for dissipating heat out of the first heating element. A projection-type image display device (100) includes a cooling device (1).SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a cooling device and a projection-type image display device including the same. [Background technology]

[0002] In a projection-type image display device such as a projector, dust and dirt that has entered the device may adhere to the prism and image display unit, causing a decrease in brightness. To avoid this situation, there is an increasing demand to house the prism and image display unit in a sealed container.

[0003] On the other hand, if the prism and the image display unit are housed in a sealed container, the inside of the container becomes hot due to heat generated during operation. Therefore, in order to prevent the image display unit of the projection type image display device from becoming too hot, a cooling device is needed to cool the image display unit housed in the container, as well as the air and other members in the sealed container.

[0004] For example, Patent Document 1 discloses a configuration in which the heat sinks of each of a plurality of display devices are exposed to the outside of a dustproof container. A fan is provided to cool the heat sinks exposed to the outside. Also, a heat exchange unit separate from the heat sinks and fans for cooling the display devices is provided to cool the air and prisms inside the dustproof container. This configuration achieves both sealing of the dustproof container and cooling of the display devices inside the dustproof container. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2016-133609 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, since cooling devices for cooling the members housed in the container are installed separately, the entire cooling device becomes bulky.

[0007] An object of the present disclosure is to provide a space-saving cooling device and a projection-type image display device including the same. [Means for solving the problem]

[0008] The cooling device of the present disclosure comprises a sealed container that houses a first heating element, a first radiator arranged outside the container, a first blowing section that blows air to the first radiator, and a heat dissipation section that is arranged outside the container so as to be exposed to the air flow from the first blowing section and that dissipates heat from the first heating element.

[0009] The projection type image display device of the present disclosure includes a cooling device, a prism housed in a container and color-separating incident light, an image display unit disposed opposite one surface of the prism as a second heating element, and a light shielding plate as a first heating element for blocking light reflected from the image display unit. The cooling device includes a sealed container that houses the first heating element, a first radiator disposed outside the container, a first blower unit that blows air to the first radiator, and a heat dissipation unit that is disposed outside the container so as to be exposed to the airflow from the first blower unit and dissipates heat from the first heating element. The cooling device further includes a heat receiving unit that receives heat from the second heating element disposed in the container, a first flow path unit through which the coolant cooled by the first radiator flows to the heat receiving unit, and a second flow path unit through which the coolant heated by the heat receiving unit flows to the first radiator. Effect of the Invention

[0010] According to the cooling device of the present disclosure, it is possible to provide a space-saving cooling device and a projection-type image display device including the same. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is an external perspective view of a cooling device according to a first embodiment; [Diagram 2]FIG. 1 is a plan view of a cooling device according to a first embodiment; [Diagram 3] FIG. 1 is a plan view of a cooling device according to a first embodiment with a lid removed; [Figure 4] FIG. 1 is a perspective view of a cooling device according to a first embodiment, in which a container is omitted; [Diagram 5] FIG. 1 is a perspective view of a cooling device according to a first embodiment, in which a container is omitted; [Figure 6] FIG. 1 is a perspective view of a cooling device according to a first embodiment, in which a container and a blower are omitted; [Figure 7] FIG. 13 is a configuration diagram of a projection type image display device according to a second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, the embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially the same configuration may be omitted. This is to avoid the following explanation becoming unnecessarily redundant and to facilitate understanding by those skilled in the art. The inventor(s) provide the accompanying drawings and the following description so that those skilled in the art can fully understand the present disclosure, and do not intend for them to limit the subject matter described in the claims.

[0013] (Embodiment 1) Hereinafter, the first embodiment will be described with reference to FIGS.

[0014] [1-1. Configuration] A schematic configuration of a cooling device 1 according to a first embodiment of the present disclosure will be described with reference to Figures 1 and 2. Figure 1 is an external perspective view of the cooling device 1 according to the first embodiment of the present disclosure. Figure 2 is a plan view of the cooling device according to the first embodiment. For convenience of the following description, an XYZ Cartesian coordinate system shown in each figure is adopted, with the Z-axis direction being the up-down direction.

[0015] The cooling device 1 includes a container 3, a first radiator 5, a first blower 7, and a heat dissipation unit 9. The container 3 houses a light shielding plate 11 (see FIG. 4) as a first heat generating unit. The container 3 includes a main body 3a and a lid 3b. The lid 3b is fixed to the main body 3a via a sealing material such as an O-ring, and the container 3 is sealed. This prevents dust and dirt from entering the container 3 from the outside. The lid 3b includes a first upper surface 3ba, a side surface 3bb, and a second upper surface 3bc. The side surface 3bb extends downward from one side of the first upper surface 3ba, and the second upper surface 3bc extends from the lower side of the side surface 3bb in parallel with the first upper surface 3ba. The heat dissipation unit 9 is attached to the side surface 3bb and is connected to the light shielding plate 11 in the container 3 via a wall. The heat dissipation unit 9 is, for example, a metal heat dissipation fin. The connection surface between the heat dissipation portion 9 and the side surface 3bb is sealed with, for example, grease.

[0016] The first radiator 5 is disposed outside the container 3. The first radiator 5 is connected to a pipe 12 through which the refrigerant flowing from the inside of the container 3 passes, and a pipe 13 through which the refrigerant flowing into the inside of the container 3 passes. The pipes 12, 13 pass through a through hole (not shown) provided in the container 3, and the portion where the pipes 12, 13 pass through the through hole is sealed with a cushion or the like.

[0017] Please refer to Fig. 3. Fig. 3 is a plan view of the cooling device 1 of the first embodiment with the lid 3b removed. An image display unit 51 as a second heat generating unit and a prism unit 61 are housed in the container 3. The cooling device 1 further includes a heat receiving unit 15 that receives the drive heat of the image display unit 51. In the first embodiment, since three image display units 51G, 51B, and 51R are housed in the container 3, the heat receiving unit 15 includes a first heat receiving element 15G, a second heat receiving element 15B, and a third heat receiving element 15R that absorb the drive heat of the image display units 51G, 51B, and 51R, respectively.

[0018] There are three types of image display sections 51: image display section 51B for modulating blue light, image display section 51R for modulating red light, and image display section 51G for modulating green light, corresponding to the three colors of light separated by prism unit 61. Each of image display sections 51B, 51R, and 51G is housed in container 31. Note that when image display sections 51B, 51R, and 51G are collectively referred to, they will be simply referred to as image display section 51.

[0019] The cooling device 1 further includes a second radiator 17, a second blower 19, and pipes 21, 23, and 25. Furthermore, a pump 27 is built into the heat receiving section 15, and the pump 27 can send the refrigerant to the pipes. The pipe 21 connects the first heat receiving element 15G and the second heat receiving element 15B. The pipe 23 connects the second heat receiving element 15B and the third heat receiving element 15R. The pipe 25 connects the third heat receiving element 15R and the second radiator 17. Furthermore, the pipe 13 connects the first radiator 5 and the first heat receiving element 15G, and the pipe 12 connects the second radiator 17 and the first radiator 5. The first radiator 5, the first blower 7, the heat receiving section 15, the pipes 12, 13, 21, 23, the second radiator 17, the second blower 19, and the pump 27 configure the liquid cooling system 2. The first blower 7 and the second blower 19 are, for example, fans.

[0020] The refrigerant cooled by the first radiator 5 is forced by the pump 27 to flow in sequence through the pipe 13, the first heat receiving element 15G, the pipe 21, the second heat receiving element 15B, the pipe 23, the third heat receiving element 15R, the pipe 25, the second radiator 17, and the pipe 12, and then returns to the first radiator 5 and circulates.

[0021] Each of the first to third heat receiving elements 15G, 15B, and 15R includes, for example, a metal fin (not shown) connected to the back surface of the image display unit 51 and a case 15a that houses the metal fin, and by flowing a coolant through the case 15a, the heat of the metal fin can be absorbed by the coolant. In addition, the flow paths of the coolant to the first to third heat receiving elements 15G, 15B, and 15R are connected in series by pipes 13, 21, 23, and 25, respectively, and therefore the arrangement of the pipes can be simplified.

[0022] The refrigerant whose temperature is gradually increased by the first to third heat receiving elements 15G, 15B, 15R flows to the second radiator 17. In the container 3, the second radiator 17 is disposed between the second blower 19 and the image display unit 51 and the prism unit 61.

[0023] The cooling air flowing from the second blower 19 through the second radiator 17 cools the image display unit 51 and the prism unit 61. The cooling air whose temperature has been increased by the image display unit 51 and the prism unit 61 circulates inside the container 3 and is sent again from the second blower 19 to the second radiator 17. The second radiator lowers the temperature of the cooling air by absorbing heat from the cooling air whose temperature has been increased by the refrigerant. The cooled cooling air flows again from the second radiator into the container 3. In this manner, the inside of the container 3 is cooled.

[0024] The refrigerant further heated in the second radiator 17 passes through the pipe 12 and is cooled in the first radiator 5 arranged outside the container 3. In the first radiator 5, the temperature of the refrigerant is lowered by the cooling air sent from the first blower 7. The air that has cooled the first radiator 5 flows directly toward the heat dissipation section 9.

[0025] The image display unit 51 includes, for example, a reflective image display element. The reflective image display element is a DMD (Digital Mirror Device). The reflective image display element has a plurality of tiny mirrors arranged two-dimensionally. The tilt direction of each of the tiny mirrors is controlled in two directions in accordance with an image signal from the outside. The reflected light from the mirror returns to the prism unit 61 at an incident angle of 0 degrees at the tilt angle when an ON signal is input, and re-enters the prism unit 61 at a large angle when an OFF signal is input. The light that enters the prism unit 61 when the OFF signal is input is output from the top of the prism unit 61 and is irradiated onto the light shielding plate 11 (see FIG. 4). As a result, the temperature of the light shielding plate 11 rises.

[0026] The light shielding plate 11 has a light receiving portion 11a that is irradiated with light emitted from the prism unit 61, and a heat conducting plate 11b that extends from the upper portion of the light receiving portion 11a. The heat dissipation portion 9 is connected to the heat conducting plate 11b via the container 3, and heat of the light receiving portion 11a is transferred to the heat dissipation portion 9 via the heat conducting plate 11b as a thermally conductive member and the container 3. That is, the heat of the light receiving portion 11a is dissipated by direct thermal conduction to the heat dissipation portion 9 without using a refrigerant. The heat conducting plate 11b and the light receiving portion 11a are integrally formed, but may be configured as separate bodies. The heat conducting plate 11b is a metal with high thermal conductivity, for example, a copper or graphite sheet.

[0027] The first radiator 5 is disposed between the first blower 7 and the heat dissipation section 9. Therefore, the heat dissipation section 9 is cooled by the air that flows out from the first blower 7 and cools the first radiator 5. The air that has passed through the first radiator 5 has a lower temperature than the heat dissipation section 9, so it can cool the heat dissipation section 9. Even if the temperature of the refrigerant flowing into the first radiator 5 is lower than the temperature of the heat dissipation section 9, the air heated by the first radiator 5 is lower than the temperature of the heat dissipation section 9, so it can cool the heat dissipation section 9.

[0028] [1-2. Effects, etc.] As described above, the cooling device 1 of this embodiment comprises a sealed container 3 that houses a light blocking plate 11 as a first heat generating body, a first radiator 5 arranged outside the container 3, a first blower section 7 that sends air to the first radiator 5, and a heat dissipation section 9 that is arranged to be exposed to the air flow from the first blower section 7 and dissipates heat from the light blocking plate 11.

[0029] By dissipating the heat from the first heating element outside the container 3 and cooling the heat dissipation section 9 using the wind that cools the first radiator 5, it is possible to achieve space saving in the cooling device 1 that cools the light blocking plate 11 contained within the sealed container.

[0030] In the first embodiment, the air from the first blower 7 arranged opposite the first radiator 5 that cools the refrigerant flowing inside the container 3 to which the heat dissipation unit 9 is attached is used as the air to be sent to the heat dissipation unit 9, but this is not limited thereto. Air that cools a radiator other than the first radiator 5 that cools the refrigerant flowing from inside the container 3 may be used and sent to the heat dissipation unit 9, or air from a blower attached to another container 3 or device may be sent to the heat dissipation unit 9 to cool a device other than the radiator.

[0031] The container 3 includes a heat receiving section 15 that receives heat from an image display section 51 serving as a second heating element, a pipe 13 serving as a first flow path section through which the refrigerant cooled by the first radiator 5 flows to the heat receiving section 15, and pipes 21, 23, 25, and 12 serving as a second flow path section through which the refrigerant heated in the heat receiving section 15 flows to the first radiator 5.

[0032] By using one cooling device 1 to cool two heat generating elements, the light blocking plate 11 and the image display unit 51, which are housed in a sealed container 3, it is possible to prevent the cooling system from becoming large.

[0033] The heat dissipation unit 9 is disposed so as to be exposed to the wind that has passed through the first radiator 5. Since the heat dissipation unit 9 is hotter than the refrigerant flowing through the first radiator 5, it is possible to improve the cooling efficiency by first blowing the wind from the first blower unit 7 on the first radiator 5 and then on the heat dissipation unit 9.

[0034] The cooling device 1 also includes a second blower 19 that is housed in the container 3 and blows air inside the container 3. Since the second blower 19 blows air inside the container 3, it is possible to cool each component inside the container 3, for example, the prism unit 61. The temperature inside the container 3 is dissipated to the outside air through the wall of the container 3.

[0035] The cooling device 1 also includes a second radiator 17 housed in the container 3 and exchanging heat with the air in the container 3, and a second blower 19 blows air to the second radiator 17, and a pipe 25 and a pipe 12 located midway through the second flow path are connected to the second radiator 17. In the pipes 21, 23, and 25, the refrigerant heated in the heat receiving section 15 flows to the second radiator 17, and in the pipe 12, the refrigerant further heated in the second radiator 17 flows to the first radiator.

[0036] Since the air from the second blower 19 can be absorbed by the second radiator 17, it is possible to further cool the inside of the container 3. In addition, by cooling the two heat generating elements housed in the sealed container 3 and cooling the air inside the container 3 with one cooling device 1, it is possible to prevent the cooling system from becoming even larger.

[0037] The heat dissipation section 9 is a metal fin connected to the light blocking plate 11. With this, the metal fin is exposed to the air flow from the first blower section 7, so that the heat of the light blocking plate 11 can be efficiently dissipated.

[0038] (Embodiment 2) In the second embodiment, a projection type image display device 100 including the cooling device 1 according to the first embodiment will be described.

[0039] The projection type image display device 100 includes a light source section 101, a light guide optical system LL, a modulation section 77, and a projection lens unit 139. The modulation section 77 is housed in the cooling device 1 of the first embodiment.

[0040] The projection type image display device 100 includes a light source unit 101, a light guide optical system LL, a prism unit 61, an image display unit 51, a cooling device 1, and a projection lens unit 139. The light source unit 101 emits light, and the light guide optical system LL guides the light from the light source unit 101 to the image display unit 51 via the prism unit 61. The prism unit 61 separates the light from the light source unit 101 into blue light, red light, and green light and guides them to the image display unit 51. The image display unit 51 modulates the separated color lights from the light source unit 101 in response to an external signal. The cooling device 1 cools each of the image display units 51. The projection lens unit 139 enlarges and projects an image generated by the image light modulated by each image display unit 51.

[0041] The light source unit 101 includes, for example, laser diode units 101a and 101b, mirrors 102, 104, 109, and 114, lenses 103, 108, 110, 112, and 113, diffusion plates 105 and 115, condenser lenses 106, 116, and 117, a dichroic mirror 107, a rod integrator 111, and a phosphor wheel device 118.

[0042] Each of the laser diode units 101a and 101b includes a plurality of light sources, each of which includes a pair of blue laser diodes and a collimator lens arranged on the emission side of the laser diodes, thereby enabling the light sources to emit laser light with reduced divergence.

[0043] Light emitted from laser diode unit 101a is incident on mirror 102, which has a partial opening. Of the light incident on mirror 102, a portion of the light passes through the partial opening of mirror 102 and is emitted in the +X' direction, and the remaining light is reflected by the reflecting portion in the +Y' direction.

[0044] Light emitted from laser diode unit 101b also enters mirror 102. Similarly, by entering mirror 102, part of the light passes through the partial opening of mirror 102 and is emitted in the +Y' direction, and the remaining light is reflected in the +X' direction by the reflecting portion. The shape of the opening of mirror 102, which has a partial opening, is designed so that, of the light emitted from laser diode units 101a and 101b, the ratio of blue light traveling in the +Y' direction is higher than that traveling in the +X' direction.

[0045] The blue light emitted in the +X' direction is collected by lens 103, reflected by mirror 104, and then diffused by diffuser plate 105. The diffused blue light enters condenser lens 106, becomes parallel light, and re-enters dichroic mirror 107. Dichroic mirror 107 has the property of transmitting blue light and reflecting light of other colors. Therefore, the blue light that enters dichroic mirror 107 is transmitted through dichroic mirror 107. The transmitted blue light passes through lens 108, mirror 109, and lens 110 and is collected on the entrance surface of rod integrator 111, which has a rectangular opening.

[0046] The light that has passed through mirror 102 having a partial opening and traveled in the +Y' direction is converged by lenses 112 and 113, which constitute an afocal system with mirror 114 in between, and is incident on diffuser 115. The blue laser light that has entered diffuser 115 is diffused there, and then passes through dichroic mirror 107 to enter condenser lenses 116 and 117. The blue light that has entered here enters phosphor section 119 of phosphor wheel device 118.

[0047] The phosphor section 119 is, for example, a ceramic phosphor, and a reflective layer (not shown) that reflects light of the fluorescent light wavelength is formed on the surface opposite to the excitation light incident surface. The reflective layer is fixed to a spreader 121 with excellent thermal conductivity via an adhesive layer (not shown in the figure). The spreader 121 is a disk that can be rotated by a motor 122 located in the center.

[0048] The blue light incident on phosphor section 119 is converted to yellow light by entering phosphor section 119, reflected by reflective layer 120 on the back surface, and emitted towards condenser lens 117. The yellow light passing through condenser lens 117 passes through condenser lens 116 and is incident on dichroic mirror 107. The yellow light is reflected here, and like the blue light, passes through lens 108, mirror 109, and lens 110 to be focused on the entrance surface of rod integrator 111 having a rectangular opening. Inside rod integrator 111, the blue light of the laser light source and the yellow light of the fluorescent light are superimposed to generate white light.

[0049] In this way, the light source unit 101 may have a configuration other than that described above as long as it is configured to emit white light.

[0050] The light-guiding optical system LL includes relay lenses 123 and 124 , a mirror 125 , a field lens 126 , and a total reflection prism 127 .

[0051] Light emitted from rod integrator 111 passes through relay lenses 123 and 124 and is reflected by folding mirror 125. The totally reflected light passes through field lens 126 and enters total reflection prism 127. Total reflection prism 127 includes prisms 128 and 129, and is fixed with a small gap (air gap) maintained between prisms 128 and 129. The light incident on total reflection prism 127 is totally reflected by side surface 130 of prism 128, passes through side surface 131 of prism 128, and enters prism unit 61.

[0052] Prism unit 61 is formed by adhesively fixing a first prism 134 having a blue-transmitting dichroic mirror surface 133 having a characteristic of reflecting blue light, a second prism 136 having a green-transmitting dichroic mirror surface 135 having a characteristic of reflecting red light and blue light, and a third prism 137. However, an air gap is provided between first prism 134 and second prism 136 in order to utilize total reflection.

[0053] Image display units 51R, 51G, and 51B are disposed opposite end faces of first prism 134, second prism 136, and third prism 137, respectively.

[0054] In each pixel of image display sections 51R, 51G, and 51B, light in the white display mode returns to prism unit 61, passes through prisms 128 and 129 of total reflection prism 127, enters projection lens unit 139, and reaches a screen (not shown). In this way, color display is achieved.

[0055] The projection type image display device 100 of the second embodiment includes a cooling device 1, a first prism 134 to a third prism 137 housed in a container 3 and separating incident light into colors, image display units 51G, 51B, and 51R arranged as second heating elements to face one surface of each of the first prism 134 to the third prism 137, and a light shielding plate 11 as a first heating element to shield light reflected from the image display units 51G, 51B, and 51R. The cooling device 1 includes a sealed container 3 that houses the light shielding plate 11, a first radiator 5 arranged outside the container 3, a first blower 7 that blows air to the first radiator 5, and a heat dissipation unit 9 arranged outside the container 3 so as to be exposed to the air flow from the first blower 7 and that dissipates heat from the light shielding plate 11. The cooling device 1 further includes a heat receiving section 15 that receives heat from an image display section 51 arranged in the container 3, a pipe 13 through which the refrigerant cooled by the first radiator 5 flows to the heat receiving section 15, and pipes 21, 25, and 12 through which the refrigerant heated by the heat receiving section 15 flows to the first radiator 5.

[0056] As a result, heat is dissipated from the light shielding plate 11 by the heat dissipation section 9, and heat is received by the heat receiving section 15, which is cooled by a refrigerant, from the image display section 51. Since only one of the two heat generating bodies is cooled by the refrigerant, an excessive rise in the temperature of the refrigerant can be prevented, and the first radiator 5 can be prevented from becoming large. Furthermore, since the heat dissipation section of the light shielding plate 11 is cooled using the cooling air to the first radiator 5 that cools the refrigerant that cools the image display section 51, two coolers can be cooled by one blower section, and space saving can be achieved for the cooling device 1 and the projection type image display device 100.

[0057] (Other embodiments) As described above, the above embodiment has been described as an example of the technology disclosed in this application. However, the technology in this disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are made. In addition, it is also possible to combine the components described in the above embodiment to create a new embodiment.

[0058] In the first embodiment, the light source unit 101 generates white light from the blue laser by the laser diode unit 101a, but is not limited to this. White light may be generated by combining light of each color from a red semiconductor laser, a blue semiconductor laser, and a green semiconductor laser, or a light source other than a laser, such as a lamp, may be used.

[0059] In the embodiment described above, three image display units 51 are housed in the container 3, but this is not limiting. The projection type image display device 100 may include one image display unit 51, and only one image display unit 51 and one heat receiving element may be housed in the container 3. In this case, three lights of blue, green and red are incident on the image display unit 51 in a time-division manner.

[0060] As described above, the embodiment has been described as an example of the technology in the present disclosure. For this purpose, the attached drawings and detailed description have been provided. Therefore, among the components described in the attached drawings and detailed description, not only components essential for solving the problem but also components that are not essential for solving the problem in order to exemplify the above technology may be included. Therefore, the fact that these non-essential components are described in the attached drawings or detailed description should not be used to immediately determine that these non-essential components are essential.

[0061] Furthermore, since the above-described embodiments are intended to illustrate the technology in the present disclosure, various modifications, substitutions, additions, omissions, and the like can be made within the scope of the claims or their equivalents.

[0062] (Outline of the embodiment) (1) The cooling device of the present disclosure comprises a sealed container that houses a first heating element, a first radiator arranged outside the container, a first blowing section that blows air to the first radiator, and a heat dissipation section that is arranged outside the container so as to be exposed to the air flow from the first blowing section and that dissipates heat from the first heating element.

[0063] By dissipating heat from the first heating element outside the container and cooling the heat dissipation section with the wind that cools the first radiator through which a refrigerant that cools another component passes, it is possible to achieve space saving in the cooling device that cools the light shielding plate contained within the sealed container.

[0064] (2) The cooling device of (1) includes a heat receiving section that receives heat from a second heat generating body arranged in a container, a first flow path section through which a refrigerant cooled by a first radiator flows to the heat receiving section, and a second flow path section through which the refrigerant heated by the heat receiving section flows to the first radiator. As a result, heat is dissipated from the first heat generating body in the heat dissipation section, and heat is received from the second heat generating body in the heat receiving section that is cooled by the refrigerant. Since only one of the two heat generating bodies is cooled by the refrigerant, it is possible to prevent the temperature of the refrigerant from rising excessively and to suppress the enlargement of the first radiator. In addition, since the heat dissipation section of the first heat generating body is cooled using the cooling air to the first radiator that cools the refrigerant that cools the second heat generating body, it is possible to cool two coolers with one blowing section, thereby realizing space saving of the cooling device.

[0065] (3) In the cooling device of (2), the heat dissipation portion is disposed so as to be exposed to wind that has passed through the first radiator.

[0066] (4) The cooling device according to (2) or (3), further comprising a second blowing section housed within the container for blowing air within the container.

[0067] (5) In the cooling device of (4), a second radiator is housed in the container and exchanges heat with the air in the container. The second blower sends air to the second radiator. The second flow path section and the second radiator are connected midway through the second flow path section. In the second flow path section, the refrigerant heated in the heat receiving section flows to the second radiator, and the refrigerant further heated in the second radiator flows to the first radiator.

[0068] (6) In the cooling device of any one of (2) to (5), the heat dissipation portion is a metal fin connected to the first heating element.

[0069] (7) A cooling device comprising any one of the cooling devices (2) to (5), a prism housed in a container for color separation of incident light, an image display unit as a second heating element arranged opposite one surface of the prism, and a light shielding plate as a first heating element for blocking light reflected from the image display unit. [Industrial Applicability]

[0070] The present disclosure is applicable to an image display device including a reflective image display element. [Explanation of symbols]

[0071] 1 Cooling device 2 Liquid Cooling System 3 containers 3a Main body 3b Lid 3ba 1st top surface 3bb side 3bc 2nd top surface 5. First radiator 7 First Blower Section 9 Heat radiation part 11 Shading plate 11a Light receiving part 11b Heat conduction plate 12, 13 Piping 15 Heat receiving part 15G 1st heat receiving element 15B 2nd heat receiving element 15R 3rd heat receiving element 17 Second radiator 19 Second Blower Section 21, 23 Piping 51 Image display unit 61 Prism Unit

Claims

1. A prism for color separation and color synthesis of incident light; an image display unit disposed opposite one surface of the prism; a light shielding plate that blocks light reflected from the image display unit; a container that accommodates the prism, the image display unit, and the light blocking plate; a first radiator disposed outside the container; a first blowing section that blows air in a first direction to the first radiator; a heat dissipation unit that is disposed in the first direction relative to the first blower unit and dissipates heat from the light blocking plate disposed inside the container, The light-shielding plate has a light-receiving portion to which the reflected light is irradiated and a heat-conducting portion to transmit heat of the light-receiving portion, The heat dissipation part is connected directly to the heat conduction part and via the container. Projection type image display device.

2. The image display unit is cooled by the first radiator.

2. The projection type image display device according to claim 1.

3. The temperature of the gas passing through the first radiator is lower than the temperature of the heat dissipation section.

2. The projection type image display device according to claim 1.

4. The container is a sealed container.

2. The projection type image display device according to claim 1.

5. The heat dissipation section is disposed outside the container so as to be exposed to the air flow from the first blowing section.

2. The projection type image display device according to claim 1.

6. A heat receiving section that receives heat from the image display section; a first flow path portion through which the coolant cooled by the first radiator flows to the heat receiving portion; A second flow path portion through which the coolant heated by the heat receiving portion flows to the first radiator.

2. The projection type image display device according to claim 1.

7. The heat dissipation unit is disposed so as to be exposed to wind that has passed through the first radiator.

7. The projection type image display device according to claim 6.

8. A second blowing unit is provided, the second blowing unit being accommodated in the container and blowing air within the container.

8. The projection type image display device according to claim 6 or 7.

9. a second radiator that is accommodated in the container and exchanges heat with the air in the container; The second blower sends air to the second radiator, The second flow path portion and the second radiator are connected in the middle of the second flow path portion, In the second flow path portion, the refrigerant whose temperature has been increased in the heat receiving portion flows into the second radiator, and the refrigerant whose temperature has been further increased in the second radiator flows into the first radiator.

9. The projection type image display device according to claim 8.

10. The heat dissipation unit is a fin extending in a direction intersecting the flow of air from the first blower unit.

10. The projection type image display device according to claim 1.

11. A prism for color separating and combining incident light; an image display unit disposed opposite one surface of the prism; a light shielding plate that blocks light reflected from the image display unit; a container that accommodates the prism, the image display unit, and the light blocking plate; A first radiator disposed outside the container; a first blowing section that blows air in a first direction to the first radiator; a heat dissipation section disposed in the first direction relative to the first blower section and configured to dissipate heat from the first heating element; a heat receiving section that receives heat from the image display section disposed in the container; a first flow path portion through which the coolant cooled by the first radiator flows to the heat receiving portion; a second flow path portion through which the refrigerant heated by the heat receiving portion flows to the first radiator, The heat dissipation unit is disposed outside the container so as to be exposed to the airflow from the first blower unit. Projection type image display device.

12. A container for accommodating a first heating element; A first radiator disposed outside the container; a first blowing section that blows air in a first direction to the first radiator; a heat dissipation section that is disposed in the first direction relative to the first blower section and dissipates heat from the first heating element disposed inside the container; A second blowing unit is housed in the container and blows air within the container. Cooling device.

13. a second radiator that is accommodated in the container and exchanges heat with the air in the container; The second blower sends air to the second radiator, The second flow path portion and the second radiator are connected in the middle of the second flow path portion, In the second flow path portion, the refrigerant whose temperature has been increased in the heat receiving portion flows into the second radiator, and the refrigerant whose temperature has been further increased in the second radiator flows into the first radiator.

13. The cooling device of claim 12.

Images