JP2018084777A - projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector that can efficiently cool a cooling object.SOLUTION: A projector comprises: a first circulation channel through which a first coolant cooling a first cooling object arranged in a first space made substantially airtight circulates; a second circulation channel through which a second coolant cooling the first coolant circulates; a third circulation channel through which a third coolant circulates; a heat transfer device that transfers heat of the second coolant to the third coolant; and a cooling structure that cools the third coolant. The first circulation channel is formed by a first space; the first coolant is gas; the second coolant and third coolant are liquid; the second circulation channel includes a first channel cooling the first coolant by a part of the second coolant and a second channel cooling a second cooling object by the other part of the second coolant.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a projector.

  Conventionally, a light source device, a light modulation device that modulates light emitted from the light source device to form an image according to image information, and an image formed by the light modulation device is enlarged on a projection surface such as a screen. There is known a projector including a projection optical device for projecting. As such a projector, a sealed structure in which the electro-optical device including the light modulation device is disposed, a circulation fan disposed in the sealed structure, and a cooling unit that cools air in the sealed structure are provided. A known projector is known (for example, see Patent Document 1).

In the projector described in Patent Document 1, the electro-optical device disposed in the sealed space is cooled by air circulating in the sealed space by a circulation fan. The air to which the heat of the electro-optical device is transmitted is cooled by a cooling unit.
This cooling means includes two heat transfer members provided inside and outside the sealed structure, a thermoelectric conversion element disposed between these heat transfer members, and a cooling fan. The heat of one heat transfer member provided in the sealed structure and receiving heat from the air is transmitted to the other heat transfer member provided outside the sealed structure via the thermoelectric conversion element. The other heat transfer member is a heat radiating fin, and the other heat transfer member is cooled by a cooling fan outside the sealed structure.

JP 2000-298311 A

  In recent years, the brightness of projectors has been increased, and as a result, heat generated in a cooling target such as a light modulation device has also increased. For this reason, in the configuration described in Patent Document 1, there is a possibility that the cooling target cannot be sufficiently cooled.

  SUMMARY An advantage of some aspects of the invention is to provide a projector capable of efficiently cooling an object to be cooled.

  A projector according to an aspect of the present invention includes a first circulation channel that circulates a first refrigerant that cools a first cooling target disposed in a substantially sealed first space, and a first circulation channel that cools the first refrigerant. A second circulation channel through which the two refrigerants circulate, a third circulation channel through which the third refrigerant circulates, a heat exchange device that transfers heat of the second refrigerant to the third refrigerant, and cooling the third refrigerant. The first circulation channel is formed by the first space, the first refrigerant is a gas, the second refrigerant and the third refrigerant are liquids, The second circulation flow path includes a first flow path for cooling the first refrigerant by a part of the second refrigerant, and a second flow path for cooling a second cooling target by another part of the second refrigerant. It is characterized by having.

  According to such a configuration, the first refrigerant that circulates through the first circulation channel and cools the first cooling target is cooled by the second refrigerant that circulates through the first channel of the second circulation channel. The first cooling object is cooled by the first refrigerant having a low temperature. Further, the second cooling target is cooled by the second refrigerant flowing through the second flow path of the second circulation flow path. The heat of the second refrigerant that has cooled them is transmitted to the third refrigerant that circulates in the third circulation flow path by the heat exchange device, and the third refrigerant is cooled by the cooling structure. Since each of these refrigerants circulates through the corresponding circulation flow path, the cooling state of these cooling objects can be maintained. Therefore, the first cooling object and the second cooling object can be efficiently cooled.

In the one aspect, it is preferable that the second cooling target is located in the first space.
According to such a configuration, since the second cooling object is located in the first space, the second cooling object is not only cooled by the second refrigerant but also circulated in the first space. It is also cooled by the refrigerant. Thereby, the said 2nd cooling object can be cooled more efficiently.

In the said one aspect | mode, it is preferable that the said 3rd circulation flow path cools 3rd cooling object with the said 3rd refrigerant | coolant circulated.
Here, when the second refrigerant cools the third cooling target, the temperature of the second refrigerant becomes high, and there is a possibility that the first cooling target and the second cooling target cannot be sufficiently cooled.
On the other hand, according to the said structure, when the temperature of the 3rd refrigerant | coolant to which the heat | fever of the 2nd cooling object was transmitted is not high, the 3rd cooling object can be cooled using the excess cooling capacity of the said 3rd refrigerant | coolant. . Therefore, the number of objects to be cooled can be increased.

In the one aspect, the third cooling object includes a second in-space cooling object located in a substantially sealed second space, and the third circulation channel is formed by the third refrigerant to be circulated. It is preferable to have the 2nd space cooling part which cools the cooling object in 2 spaces.
According to such a structure, in addition to the 1st cooling object and the 2nd cooling object, the 2nd space cooling object located in the 2nd space can be cooled.

In the said one aspect | mode, it is equipped with the 4th circulation channel through which the 4th refrigerant | coolant which cools the 4th cooling object located in the said 2nd space circulates, The said 4th circulation channel is formed by the said 2nd space, The object to be cooled in the second space is preferably the fourth refrigerant.
According to such a configuration, since the fourth refrigerant is cooled by the second space cooling unit, even when another cooling object is provided in the second space or when a plurality of cooling objects are provided, These cooling objects can be cooled by the fourth refrigerant circulating in the two spaces. Therefore, more cooling objects can be cooled.

In the one aspect, the third cooling target includes a second external cooling target located outside the second space, and the third circulation flow path is outside the second space by the circulated third refrigerant. It is preferable to have a second outside-space cooling unit that cools the object to be cooled.
According to such a configuration, the second outside-space cooling target located outside the second space can be cooled by the third refrigerant circulating in the third circulation channel. Therefore, it is possible to cool more cooling objects.

In the said one aspect | mode, the said 2nd space outside cooling part is comprised so that a heat transfer part to which the heat of the said 2nd space outside cooling object is transmitted and the said 3rd refrigerant | coolant can distribute | circulate, and is transmitted to the said heat transfer part. It is preferable to have a circulation part that cools the heat.
According to such a configuration, the second outside-space cooling target can be cooled by providing the second outside-space cooling unit on the third circulation channel. Therefore, the cooling object outside the second space can be reliably cooled.

In the above aspect, it is preferable that the second external cooling target is a laser element disposed in the heat transfer unit, and the flow unit is configured integrally with the heat transfer unit.
According to such a configuration, the heat transfer section in which the laser element that is the second outside-space cooling target is disposed and the circulation section through which the third refrigerant can be circulated are integrally configured, thereby the laser. The heat transfer efficiency from the element to the flow part can be increased. Therefore, the cooling efficiency of the laser element can be increased.

In the above aspect, the cooling structure includes a first heat exchanger and a second heat exchanger provided in the third circulation channel, respectively, and a first cooling fan that sends cooling gas to the first heat exchanger; A second cooling fan that sends a cooling gas to the second heat exchanger, and the third refrigerant circulating through the third circulation channel passes through the first heat exchanger, It distribute | circulates to a 2nd heat exchanger, The said 2nd space outside cooling part is provided between the said 1st heat exchanger and the said 2nd heat exchanger, The said heat exchange apparatus is a said 2nd heat exchanger. It is preferable that the 3rd refrigerant | coolant which distribute | circulated was connected with the said 2nd heat exchanger so that distribution | circulation was possible.
According to such a configuration, the third refrigerant is cooled by the first heat exchanger cooled by the cooling gas sent out by the first cooling fan, and then circulated to the second outside space cooling unit. According to this, by adjusting the amount of cooling gas delivered by the first cooling fan, the temperature of the third refrigerant flowing through the second outside-space cooling unit, and hence the outside of the second space cooled by the third refrigerant. The temperature of the cooling target can be adjusted.
Moreover, the 3rd refrigerant | coolant which distribute | circulated the 2nd heat exchanger and distribute | circulates distribute | circulates to the heat transfer apparatus which transmits the heat | fever of a 2nd refrigerant | coolant to a 3rd refrigerant | coolant. According to this, since the 3rd refrigerant | coolant with comparatively low temperature can be distribute | circulated to a heat exchange apparatus, the said 2nd refrigerant | coolant can be cooled effectively. Therefore, the first cooling object and the second cooling object can be cooled more efficiently.

In the said one aspect | mode, the temperature of the said 2nd outside space cooling object, the temperature of the said 3rd refrigerant | coolant which distribute | circulates to the said 2nd outside space cooling part, and the temperature of the said 3rd refrigerant | coolant which distribute | circulated to the said 2nd outside space cooling part It is preferable to provide a control device for controlling the operation of the first cooling fan based on at least one of the above.
Here, when the temperature of the 3rd refrigerant | coolant which distribute | circulates to the 2nd space outside cooling part is high, the cooling of the 2nd space outside cooling object by the said 2nd space outside cooling part cannot fully be performed, but 2nd space outside cooling. It is assumed that the temperature of the object will be high. Moreover, when the temperature of the 3rd refrigerant | coolant which distribute | circulated the 2nd outside space cooling part is high, it is assumed that the temperature of the 2nd outside space cooling object is high.
On the other hand, the control device includes the temperature of the second external cooling target, the temperature of the third refrigerant flowing through the second external cooling unit, and the temperature of the third refrigerant flowing through the second external cooling unit. By controlling the first cooling fan based on at least one of them, it is possible to circulate the third refrigerant having a temperature suitable for the second external space cooling target to the second external space cooling unit. Therefore, the cooling object outside the second space can be suitably cooled without the cooling object outside the second space being too hot or too cold.

In the above aspect, the heat exchanging device is connected to the second circulation flow path so that the second refrigerant flows therethrough, and a heat receiving unit that receives heat from the second refrigerant, and heat of the heat receiving unit is conducted. And a thermoelectric conversion element that conducts heat from the heat absorption surface to the heat dissipation surface, and is connected to the third circulation flow path so that the third refrigerant flows inside and is conducted from the heat dissipation surface. And a heat dissipating part that dissipates heat to the third refrigerant.
According to such a configuration, the thermoelectric conversion element transmits the heat of the second refrigerant received by the heat receiving unit to the heat radiating unit through which the third refrigerant flows, whereby the heat of the second refrigerant is transmitted to the second refrigerant. 3 Can be efficiently transmitted to the refrigerant. Therefore, since the second refrigerant can be reliably cooled, the first refrigerant in the first space, and thus the first cooling object can be efficiently cooled, and the second cooling object cooled by the second refrigerant can be efficiently cooled. it can.

In the said one aspect | mode, it is preferable to provide the circulation fan arrange | positioned in the said 1st space, and circulating the said 1st refrigerant | coolant.
According to such a configuration, the first refrigerant in the first space can be reliably circulated by the circulation fan. Therefore, the first refrigerant can be reliably circulated through the first cooling target, and the first cooling target can be reliably cooled.

In the above aspect, the light source device, the light modulation device that modulates the light emitted from the light source device to form an image, and the light modulation device that is disposed on the optical path of the light emitted from the light source device. An optical component that contributes to image formation; and a sealed housing that forms the first space therein, wherein the optical component includes a field lens, and the field lens includes the first space together with the sealed housing. Is preferably formed.
According to such a structure, the member which separates 1st space and other space (For example, the space in the housing | casing for optical components in which an optical component is arrange | positioned) is omissible. Therefore, the number of parts can be reduced, and the size of the sealed housing and thus the projector can be reduced.

1 is a schematic perspective view showing a projector according to a first embodiment of the invention. The schematic diagram which shows the image projection apparatus in the said 1st Embodiment. The schematic diagram which shows the light source device in the said 1st Embodiment. The schematic diagram which shows the cooling device in the said 1st Embodiment. The disassembled perspective view which shows the heat exchange apparatus in the said 1st Embodiment. The schematic diagram which shows the cooling device of the projector which concerns on 2nd Embodiment of this invention. The perspective view which shows the solid light source module in the said 2nd Embodiment. Sectional drawing which shows the solid light source module in the said 2nd Embodiment. The perspective view which shows the solid light source array in the said 2nd Embodiment. The perspective view which shows the solid light source array in the said 2nd Embodiment. Sectional drawing which shows the solid light source array in the said 2nd Embodiment. The schematic diagram which shows the cooling device of the projector which concerns on 3rd Embodiment of this invention. FIG. 10 is a schematic diagram illustrating a projector cooling device according to a fourth embodiment of the invention.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described based on the drawings.
[External configuration of projector]
FIG. 1 is a schematic perspective view showing a projector 1 according to this embodiment.
The projector 1 according to the present embodiment modulates light emitted from a light source device 31 to be described later to form an image according to image information, and projects the image on a projection surface such as a screen in an enlarged manner. Device.
As will be described in detail later, the projector 1 cools the first cooling target by circulating cooling air (first refrigerant) in the first sealed housing in which the first cooling target is disposed, and also the first cooling medium. A function of cooling the second liquid with a third refrigerant circulating outside the first hermetic housing, in addition to cooling the second cooling object with a part of the second refrigerant and circulating the second refrigerant for cooling the second refrigerant. Have.
As shown in FIG. 1, the projector 1 includes an exterior housing 2 that constitutes an exterior.

The exterior housing 2 is formed in a substantially rectangular parallelepiped shape having a top surface portion 21, a bottom surface portion 22, a front surface portion 23, a back surface portion 24, a left side surface portion 25 and a right side surface portion 26.
Although not shown, the bottom surface portion 22 has a plurality of leg portions that come into contact with the installation surface when placed on an installation surface such as an installation table.
The front part 23 has an opening 231 through which a part of the projection optical device 35 constituting the image projection device 3 described later is exposed.
Further, although not shown, the right side surface portion 26 has an introduction port for introducing the air outside the exterior housing 2 into the inside, and the left side surface portion 25 is an exhaust port for discharging the air inside the exterior housing 2 to the outside. Have

[Internal configuration of projector]
FIG. 2 is a schematic diagram showing the configuration of the image projection apparatus 3.
In addition to the outer casing 2, the projector 1 includes an image projection device 3 disposed in the outer casing 2 as shown in FIG. 2. In addition, although not shown, the projector 1 includes a control device that controls the projector 1 and a power supply device that supplies power to the electronic components that constitute the projector 1.

[Configuration of image projection apparatus]
The image projection device 3 forms and projects an image according to the image information input from the control device. The image projection device 3 includes a light source device 31, a homogenization device 32, a color separation device 33, an electro-optical device 34, a projection optical device 35, and an optical component casing 36.
Among these, the configuration of the light source device 31 will be described in detail later.

The homogenizer 32 uniformizes the illuminance in a plane orthogonal to the central axis of the light beam emitted from the light source device 31. The homogenizer 32 includes a light control device 320, a UV filter 321, a first lens array 322, a cinema filter 323, a second lens array 324, a polarization conversion element 325, and a superimposing lens 326. Among these, the polarization conversion element 325 aligns the polarization direction of the incident light into one type, and is one of the first cooling objects of the present invention.
The color separation device 33 separates the light beam incident from the uniformizing device 32 into three color lights of red (R), green (G), and blue (B). The color separation device 33 includes dichroic mirrors 331 and 332, reflection mirrors 333 to 336, and a relay lens 337.

The electro-optical device 34 modulates the separated color lights according to the image information, and then synthesizes the modulated color lights. The electro-optical device 34 includes a field lens 340, a light modulation device 341, an incident-side polarizing plate 342 and an emitting-side polarizing plate 343 that are provided for each color light, and one color composition device 344.
Each field lens 340 is disposed between the incident-side polarizing plate 342 and a corresponding reflecting mirror among the reflecting mirrors 334 to 336.
The light modulation device 341 (the light modulation devices for red, green, and blue are referred to as 341R, 341G, and 341B, respectively) is configured by a liquid crystal panel.
The color synthesizer 344 can employ a cross dichroic prism.

  The projection optical device 35 is a projection lens that enlarges and projects the light beam (the light beam forming the image) synthesized by the color synthesis device 344 onto the projection surface. As such a projection optical device 35, a combined lens in which a plurality of lenses are arranged in a lens barrel can be adopted.

The optical component casing 36 is a box-shaped casing in which the illumination optical axis Ax is set. The light source device 31, the uniformizing device 32, the color separation device 33, and the electro-optical device 34 are arranged at a position on the illumination optical axis Ax in the optical component casing 36. Further, although the projection optical device 35 is located outside the optical component housing 36, it is arranged according to the illumination optical axis Ax.
Such an optical component casing 36 is combined with other casings to form a first sealed casing 511 that forms a first circulation channel 51 described later. The first sealed casing 511 forms a first space S1 whose inside is substantially sealed, and the electro-optical device 34 and the polarization conversion element 325 are disposed in the first space S1. The first sealed casing 511 (first space S1) is partially formed by a field lens 340 fitted in a groove (not shown) formed in the optical component casing 36.

[Configuration of light source device]
FIG. 3 is a schematic diagram illustrating a configuration of the light source device 31.
As described above, the light source device 31 emits a light beam including red, green, and blue color lights toward the uniformizing device 32. As shown in FIG. 3, the light source device 31 includes a light source unit 40, an afocal optical element 41, a first phase difference element 42, a homogenizer optical device 43, a light synthesis device 44, a second phase difference element 45, and a first light collecting element. An element 46, a light diffusing device 47, a second condensing element 48, and a wavelength conversion device 49 are provided.
Among these, the light source unit 40, the afocal optical element 41, the first phase difference element 42, the homogenizer optical device 43, the second phase difference element 45, the first light condensing element 46, and the light diffusion device 47 are the first illumination light. It is arranged on the axis Ax1. On the other hand, the 2nd condensing element 48, the wavelength converter 49, and the said equalization apparatus 32 are arrange | positioned on 2nd illumination optical axis Ax2 which cross | intersects 1st illumination optical axis Ax1. The light combining device 44 is disposed at the intersection of the first illumination optical axis Ax1 and the second illumination optical axis Ax2.

[Configuration of light source section]
The light source unit 40 is a light emitting device that emits excitation light that is blue light. The light source unit 40 includes a first light source unit 401, a second light source unit 402, and a light combining member 403.
The first light source unit 401 includes a solid light source array SA in which a plurality of solid light sources SS, which are LDs (Laser Diodes), are arranged in a matrix, and a plurality of parallel lenses (not shown) corresponding to each solid light source SS. Have. Similarly, the second light source unit 402 includes a solid light source array SA and a plurality of collimating lenses (not shown) corresponding to the solid light sources SS. These solid light sources SS emit, for example, excitation light having a peak wavelength of 440 nm, but may emit excitation light having a peak wavelength of 446 nm or excitation light having a wavelength of 460 nm. In addition, solid light sources that emit excitation light having different peak wavelengths may be mixed in the light source units 401 and 402. The excitation light emitted from these solid light sources SS is collimated by a collimating lens (collimator lens) and is incident on the light combining member 403.
In the present embodiment, the excitation light emitted from each solid light source SS is s-polarized light. However, the present invention is not limited to this, and the excitation light may be p-polarized light. The first light source unit 401 and the second light source unit 402 may include a solid light source SS that emits s-polarized excitation light and a solid light source SS that emits p-polarized excitation light. In this case, the first phase difference element 42 described later can be omitted.

The light combining member 403 transmits the excitation light emitted from the first light source unit 401 along the first illumination optical axis Ax1, and is emitted from the second light source unit 402 along the direction intersecting the first illumination optical axis Ax1. The excitation light thus reflected is reflected along the first illumination optical axis Ax1, and the excitation light is synthesized. Excitation light that has passed through the light combining member 403 is incident on the afocal optical element 41.
Note that the light source unit 40 may have only the first light source unit 401 or may have more light source units. When the light source unit 40 includes only the first light source unit 401, the light combining member 403 can be omitted.

[Configuration of afocal optical element]
The afocal optical element 41 adjusts (reduces) the beam diameter of the excitation light incident from the light source unit 40. Specifically, the afocal optical element 41 condenses the excitation light incident as parallel light from the light source unit 40 to reduce the beam diameter, and collimates the excitation light incident from the lens 411. And a lens 412 that emits light.

[Configuration of First Phase Difference Element]
The first phase difference element 42 is a half-wave plate. By passing through the first phase difference element 42, the s-polarized excitation light incident from the afocal optical element 41 is partially converted into p-polarized excitation light, and s-polarized light and p-polarized light are mixed. Excitation light. Such excitation light is incident on the homogenizer optical device 43.

[Configuration of homogenizer optical device]
The homogenizer optical device 43 equalizes the illuminance distribution of the excitation light incident on the illuminated area in the light diffusing device 47 and the wavelength converter 49. The excitation light that has passed through the homogenizer optical device 43 is incident on the photosynthesis device 44. Such a homogenizer optical device 43 includes a first multi lens 431 and a second multi lens 432.
Such a homogenizer optical device 43 may be arranged between the afocal optical element 41 and the first phase difference element 42.

[Configuration of photosynthesis device]
The light combining device 44 is a PBS (Polarizing Beam Splitter) having a prism 441 formed in a substantially right-angled isosceles triangular prism shape, and a surface 442 corresponding to the hypotenuse of the first illumination optical axis Ax1 and the second illumination optical axis Ax2. Of the surfaces 443 and 444 corresponding to the adjacent sides, the surface 443 intersects the second illumination optical axis Ax2 and the surface 444 intersects the first illumination optical axis Ax1. Of these surfaces 442 to 444, a polarization separation layer 445 having wavelength selectivity is formed on the surface 442.

The polarization separation layer 445 has a property of separating s-polarized light and p-polarized light included in incident excitation light, and also allows the fluorescence generated by the wavelength conversion device 49 to pass through regardless of the polarization state of the fluorescence. Have That is, the polarization separation layer 445 separates the s-polarized light and the p-polarized light for the light in the blue light region wavelength, but passes the s-polarized light and the p-polarized light for the light in the green light region and the red light region, respectively. It has a wavelength-selective polarization separation characteristic.
Thus, the p-polarized light out of the excitation light incident from the homogenizer optical device 43 is passed to the second phase difference element 45 side along the first illumination optical axis Ax1 by the light combining device 44 that also functions as a light separation device. The s-polarized light is reflected toward the second light collecting element 48 along the second illumination optical axis Ax2.
Further, as will be described in detail later, the photosynthesis device 44 synthesizes the excitation light (blue light) incident via the second phase difference element 45 and the fluorescence incident via the second light condensing element 48. .

[Configuration of Second Phase Difference Element]
The second phase difference element 45 is a ¼ wavelength plate, converts the p-polarized excitation light incident from the light combining device 44 into circularly polarized excitation light, and enters the first light condensing element 46. (Circularly polarized light opposite to the circularly polarized light) is converted into s-polarized light.

[Configuration of the first condensing element]
The first condensing element 46 condenses (focuses) the excitation light that has passed through the second phase difference element 45 on the light diffusion device 47. In the present embodiment, the first light collecting element 46 is constituted by three pickup lenses 461 to 463. However, the number of lenses constituting the first light collecting element 46 is not limited to three.

[Configuration of light diffusion device]
The light diffusing device 47 diffuses the incident excitation light at the same diffusion angle as the fluorescence generated and emitted by the wavelength conversion device 49. The light diffusing device 47 includes a disk-shaped light diffusing element 471 on which an annular reflection layer centered on the rotation center is formed, and a rotating device 472 that rotates the light diffusing element 471. The reflection layer causes Lambertian reflection of incident light.
The excitation light (diffused light) diffused and reflected by such a light diffusing element 471 is incident on the second phase difference element 45 again via the first light collecting element 46. The circularly polarized light incident on the light diffusing element 471 when reflected by the light diffusing element 471 becomes a reverse circularly polarized light and passes through the light combining device 44 in the process of passing through the second phase difference element 45. It is converted into s-polarized excitation light whose polarization direction is rotated by 90 ° with respect to p-polarized excitation light. The s-polarized excitation light is reflected by the polarization separation layer 445 and is incident on the homogenizer 32 as blue light along the second illumination optical axis Ax2.

[Configuration of Second Light Condensing Element]
The second condensing element 48 receives s-polarized excitation light that has passed through the homogenizer optical device 43 and is reflected by the polarization separation layer 445. As described above, the second condensing element 48 condenses (converges) the incident excitation light on the illuminated region of the wavelength conversion device 49 (the wavelength conversion layer 493 of the wavelength conversion element 491), and the wavelength. The fluorescence emitted from the conversion device 49 is collimated and emitted toward the polarization separation layer 445. In the present embodiment, the second light collecting element 48 includes three pickup lenses 481 to 483. However, the number of lenses included in the second light collecting element 48 is not limited to three.

[Configuration of wavelength converter]
The wavelength converter 49 converts the wavelength of incident light. In this embodiment, the incident blue light excitation light (s-polarized excitation light) is converted into fluorescence including green light and red light. Wavelength conversion. The wavelength conversion device 49 includes a wavelength conversion element 491, a rotation device 495 that rotates the wavelength conversion element 491, and a heat dissipation member 496 that dissipates heat transmitted from the wavelength conversion element 491.

The wavelength conversion element 491 includes a support 492, and a wavelength conversion layer 493 and a reflection layer 494 located on the incident surface 492A of excitation light in the support 492.
The support 492 is a flat member formed in a substantially circular shape when viewed from the incident side of the excitation light. The support 492 can be made of, for example, metal or ceramics.
The wavelength conversion layer 493 is an illuminated area illuminated by the homogenizer optical device 43 and the second light collecting element 48. The wavelength conversion layer 493 is a phosphor layer including a phosphor that is excited by excitation light and diffuses and emits fluorescence that is non-polarized light (for example, fluorescence having a peak wavelength in a wavelength range of 500 to 700 nm). A part of the fluorescence generated in the wavelength conversion layer 493 is emitted to the second light collecting element 48 side, and the other part is emitted to the reflective layer 494 side.
The reflective layer 494 is disposed between the wavelength conversion layer 493 and the support 492, and reflects the fluorescence incident from the wavelength conversion layer 493 toward the second light collecting element 48 side.

When such a wavelength conversion layer 493 is irradiated with excitation light, the wavelength conversion layer 493 and the reflection layer 494 diffuse and emit the fluorescence toward the second light collecting element 48 side. This fluorescence is incident on the polarization separation layer 445 through the second light collecting element 48, passes through the polarization separation layer 445 along the second illumination optical axis Ax2, and is incident on the homogenizer 32. . That is, the fluorescence passes through the polarization separation layer 445, is combined with excitation light that is blue light reflected by the polarization separation layer 445, and enters the uniformizing device 32 as illumination light.
Such a wavelength conversion layer 493 generates heat by the incidence of excitation light, and the generated heat is transmitted to the support 492 through the reflective layer 494. The heat transmitted to the support 492 is radiated by the heat radiating member 496 connected to the surface 492B of the support 492 opposite to the incident surface 492A.

[Configuration of cooling device]
FIG. 4 is a schematic diagram showing the configuration of the cooling device 5.
The projector 1 includes a cooling device 5 disposed in the exterior housing 2 in addition to the above configuration. As shown in FIG. 4, the cooling device 5 includes a first circulation channel 51 through which a first refrigerant RE1 that cools the first cooling target circulates, and cools the first refrigerant RE1 and also cools the second cooling target. The second circulation channel 52 through which the second refrigerant RE2 circulates and the third circulation channel 53 through which the third refrigerant RE3 that cools the second refrigerant RE2 circulates. In addition, the cooling device 5 includes a heat exchange device 54 that transfers heat of the second refrigerant RE2 to the third refrigerant RE3, and a cooling structure 55 that cools the third refrigerant RE3.

[Configuration of the first circulation channel]
The first circulation channel 51 is a channel through which the first refrigerant RE1 that is a gas in the first space S1 formed by the first sealed casing 511 is circulated. The first circulation channel 51 includes the first hermetic casing 511, and circulation fans 512 and blower fans 513 to 515 that are disposed in the first space S1, respectively.

As described above, the first sealed housing 511 is configured by combining the optical component housing 36 and another housing, and forms the first space S1 therein. In the first space S1, among the image projection apparatuses 3, at least a light modulation device 341, an incident side polarizing plate 342 and an output side polarizing plate 343 that constitute the electro-optical device 34, and a polarization conversion element 325 are arranged. The These are the first cooling objects.
In addition, the radiator 521 which comprises the 2nd circulation flow path 52 is arrange | positioned in 1st space S1. As will be described in detail later, the radiator 521 transmits the heat of the first refrigerant RE1 to the second refrigerant flowing through the radiator 521, thereby cooling the first refrigerant RE1.
The circulation fan 512 is a fan that circulates the first refrigerant RE1 and is disposed in the vicinity of the radiator 521. The circulation fan 512 sucks the first refrigerant RE1 cooled by the radiator 521 and sends it out to the electro-optical device 34 side among the first objects to be cooled.
The first refrigerant RE1 may be a gas and may be a gas other than air (such as nitrogen gas or helium gas).

Among the blower fans 513 to 515, the blower fan 513 sends the first refrigerant RE <b> 1 to the emission-side polarizing plate 343 and the light modulation device 341. In the present embodiment, the blower fan 513 is provided for each light modulation device 341.
The blower fan 514 sends the first refrigerant RE1 to the incident side polarizing plate 342 and the light modulation device 341. The blower fan 514 is also provided for each light modulation device 341 in the present embodiment.
The blower fan 515 sends the first refrigerant RE1 to the polarization conversion element 325.

  The first refrigerant RE1 that has cooled the first cooling target is sucked by the circulation fan 512, cooled by the radiator 521, and then sent out toward the electro-optical device 34 again. In this way, the first refrigerant RE1 circulates through the first circulation channel 51 formed in the first sealed casing 511.

[Configuration of Second Circulation Channel]
The second circulation channel 52 is a channel through which the second refrigerant RE2 that cools the first refrigerant RE1 and the light modulation device 341 that is also the second cooling target circulates. The second circulation channel 52 includes a radiator 521, a tank 522, a pump PU (inflow chamber PU2), a heat exchange device 54 (heat receiving portion 541), and a plurality of connection members CM that connect them. Has been.
Among these, the plurality of connection members CM are tubular members formed so that the second refrigerant RE2 can flow therethrough. The second refrigerant RE2 can be exemplified by an antifreeze liquid (liquid) such as water or propylene glycol.

The radiator 521 is a heat exchanger through which the second refrigerant RE2 flows. The radiator 521 is disposed in the first sealed casing 511, and cools the first refrigerant RE1 circulating in the first sealed casing 511. Such a radiator 521 is connected to a connection member CM connected to the tank 522 and a connection member CM connected to the heat receiving portion 541 of the heat exchange device 54.
As the first refrigerant RE1 flows along the radiator 521, the first refrigerant RE1 is cooled.

  The tank 522 temporarily stores the second refrigerant RE2 to which the heat of the first refrigerant RE1 has been transmitted by the radiator 521. The tank 522 is connected to the pump PU (specifically, the inflow chamber PU2) via the connection member CM, and the second refrigerant RE2 stored in the tank 522 is sucked by the pump PU. By storing the second refrigerant RE2 in such a tank 522, the second refrigerant RE2 mixed with air and impurities is prevented from flowing into the pump PU (inflow chamber PU2), and the second refrigerant RE2 Is cooled.

The pump PU has a pumping unit PU1 and inflow chambers PU2 and PU3.
The inflow chamber PU2 constitutes a part of the second circulation channel 52, and the second refrigerant RE2 is introduced into the inflow chamber PU2. The second refrigerant RE2 that has flowed into the inflow chamber PU2 from the tank 522 is pumped to the heat receiving unit 541 of the heat exchange device 54 by driving the pumping unit PU1, and is circulated to the radiator 521 through the heat receiving unit 541.
The inflow chamber PU3 constitutes a part of the third circulation channel 53, and the third refrigerant RE3 is introduced into the inflow chamber PU3. As will be described in detail later, the third refrigerant RE3 flowing into the inflow chamber PU2 from the tank 531 is pumped to the heat exchanger 551 of the cooling structure 55 by driving the pumping unit PU1, and heat is transmitted through the heat exchanger 551. It is distributed to the heat radiating unit 544 of the exchange device 54.
The heat exchange device 54 and the cooling structure 55 will be described in detail later.

[First and second flow paths in the second circulation flow path]
Among the connection members CM, the connection member CM1 through which the second refrigerant RE2 cooled by the heat exchange device 54 circulates is connected to the first flow path FC1 through which a part of the second refrigerant RE2 is circulated to the radiator 521, And a second flow path FC2 for allowing another part of the refrigerant RE2 to flow to the light modulation device 341. The connecting member CM1 includes flow path forming members CM11 to CM13, a branching part CM14, and an adjusting part CM15.
One end of the flow path forming member CM11 is connected to the heat exchange device 54 (heat receiving portion 541), and the other end is connected to the branching portion CM14. The flow path forming member CM12 has one end connected to the branch part CM14 and the other end connected to the radiator 521. The flow path forming member CM13 has one end connected to the branch part CM14 and the other end connected to the light modulation device 341.
The first flow path FC1 through which the second refrigerant RE2 flows from the heat exchange device 54 to the radiator 521 is formed by the flow path forming members CM11 and CM12 and the branch portion CM14. Further, the flow path forming members CM11 and CM13 and the branch part CM14 form a second flow path FC2 through which the second refrigerant RE2 flows from the heat exchange device 54 to the light modulation device 341.
Note that the flow order of the second refrigerant RE2 to the light modulation device 341 (341B, 341G, 341R) can be changed as appropriate, but the second refrigerant RE2 may be flowed in order from the light modulation device 341 having a higher calorific value. preferable.

The adjustment unit CM15 is an adjustment valve provided in the branching unit CM14 in the present embodiment, and flows through the first flow path to the radiator 521 and flows through the second flow path. The flow rate of the second refrigerant RE2 toward the light modulation device 341 is adjusted. At this time, the adjustment unit CM15 performs adjustment so that a sufficient amount of the second refrigerant RE2 flows through the light modulation device 341. Specifically, since the diameter of the flow path forming member CM12 that allows the second refrigerant RE2 to flow through the light modulation device 341 is small and the length is long, the adjustment unit CM15 has a sufficient amount of the second refrigerant in each light modulation device 341. In order to spread the RE2, the delivery pressure of the second refrigerant RE2 is increased.
However, instead of or in addition to providing such an adjustment unit CM15, the pipe diameters of the flow path forming member CM12 and the flow path forming member CM13 may be different. For example, the pipe diameter of the flow path forming member CM13 that forms the second flow path FC2 toward the light modulation device 341 is larger than the pipe diameter of the flow path forming member CM12 that forms the first flow path FC1 toward the radiator 521. Then, a sufficient amount of the second refrigerant RE2 may flow through the flow path forming member CM13 (and thus the light modulation device 341).

Of the connection members CM, the connection member CM2 in which the second refrigerant RE2 flows from the radiator 521 and the light modulation device 341 to the tank 522 includes flow path forming members CM21 to CM23 and a junction part CM24.
The flow path forming member CM21 has one end connected to the radiator 521 and the other end connected to the junction CM24. The flow path forming member CM22 has one end connected to the light modulation device 341 and the other end connected to the merging portion CM24. The flow path forming member CM23 has one end connected to the merging portion CM24 and the other end connected to the tank 522.
By such a connection member CM2, the second refrigerant RE2 that has flowed through the radiator 521 and the second refrigerant RE2 that has flowed through the light modulation device 341 are merged and flowed to the tank 522.
In addition, in this embodiment, although the branch part CM14, the adjustment part CM15, and the junction part CM24 were located in the 1st sealed housing | casing 511, you may be located outside the 1st sealed housing 511. For example, at least one of the branching unit CM14, the adjusting unit CM15, and the merging unit CM24 may be located in the first sealed casing 511, and the other may be positioned outside the first sealed casing 511.

  In such a second circulation flow path 52, the second refrigerant RE2 stored in the tank 522 is sucked by the pumping unit PU1 of the pump PU and pumped to the heat exchange device 54 (heat receiving unit 541). And the 2nd refrigerant | coolant RE2 which distribute | circulated and cooled through the heat exchange apparatus 54 is shunted to the radiator 521 and the light modulation apparatus 341 by the said connection member CM1. The second refrigerant RE2 to which heat has been transmitted from these devices 521 and 341 flows into the tank 522 via the connecting member CM2, and is stored again in the tank 522. As described above, the heat of the second refrigerant RE2 is transferred to the third refrigerant RE3 by the heat exchange device 54.

[Configuration of heat exchanger]
FIG. 5 is an exploded perspective view showing the configuration of the heat exchange device 54.
The heat exchange device 54 transfers heat received from the second refrigerant RE2 circulating in the second circulation channel 52 to the third refrigerant RE3 circulating in the third circulation channel 53, thereby cooling the second refrigerant RE2. To do. As shown in FIG. 5, the heat exchange device 54 includes a heat receiving unit 541 through which the second refrigerant RE2 flows, two heat conducting units 542 and 543 that sandwich the heat receiving unit 541, and the heat receiving unit 541 and the heat conducting unit 542. , 543 and two heat radiating portions 544, 545 through which the third refrigerant RE3 flows.

The heat receiving part 541 forms a part of the second circulation channel 52. The heat receiving unit 541 receives heat from the second refrigerant RE2 in the process of flowing the second refrigerant RE2 flowing in from the inflow chamber PU2 of the pump PU. In such an internal space of the heat receiving portion 541, a plurality of fine flow paths (not shown) are formed by a plurality of heat conductive fins. And in the process in which the 2nd refrigerant | coolant RE2 passes through the said several fine flow path, the heat receiving part 541 receives heat from 2nd refrigerant | coolant RE2.
In this way, the cooled second refrigerant RE2 flows to the radiator 521 and the light modulation device 341 via the connection member CM1.

The two heat conducting portions 542 and 543 have thermoelectric conversion elements TC.
In the present embodiment, the thermoelectric conversion element TC is configured by a Peltier element. The endothermic surfaces TCA of these thermoelectric conversion elements TC are connected to the heat receiving portion 541. The heat dissipation surface TCB of the thermoelectric conversion element TC included in the heat conduction unit 542 is connected to the heat dissipation unit 544 and transmits heat received from the second refrigerant RE2 by the heat reception unit 541 to the heat dissipation unit 544. In addition, the heat radiation surface TCB of the thermoelectric conversion element TC included in the heat conduction unit 543 is connected to the heat radiation unit 545 and transmits heat received from the second refrigerant RE2 by the heat reception unit 541 to the heat radiation unit 545.

  The operation of each thermoelectric conversion element TC is controlled by setting an applied voltage by the control device. At this time, the control device controls the heat conduction state of each thermoelectric conversion element TC based on the temperature inside and outside the first sealed casing 511. For example, the control device controls the heat conduction state of each thermoelectric conversion element TC so that the temperature inside the first sealed casing 511 falls within a predetermined range of the temperature outside the first sealed casing 511. Thereby, it is suppressed that the inside of the 1st airtight housing | casing 511 becomes too cold etc. and dew condensation arises in the said 1st airtight housing | casing 511.

The heat radiating portions 544 and 545 form a part of the third circulation flow path 53, and the third refrigerant RE3 circulates therein.
Among these, the heat radiating portion 544 is connected to the connection member CN forming the third circulation flow path 53, and the third refrigerant RE3 cooled by the cooling structure 55 described later flows in from below. Further, the third refrigerant RE3 discharged from above the heat radiating portion 544 flows into the heat radiating portion 545 from below, and the third refrigerant RE3 is supplied from above the heat radiating portion 545 via the connecting member CN (see FIG. 5). 4). That is, the heat radiating part 544 and the heat radiating part 545 are connected in series in the third circulation channel 53, the heat radiating part 544 is located on the upstream side, and the heat radiating part 545 is located on the downstream side.
Although not shown in the figure, the heat radiation portions 544 and 545 have a plurality of fine channels formed in the same manner as the heat receiving portion 541. Then, the heat conducted to the heat radiating parts 544 and 545 is transmitted to the third refrigerant RE3 in the course of flowing through the plurality of fine flow paths.

[Configuration of third circulation channel]
The third circulation channel 53 is a channel through which the third refrigerant RE3 (in other words, the third refrigerant RE3 that cools the second refrigerant RE2) to which the heat of the second refrigerant RE2 is transmitted by the heat exchange device 54 circulates. is there. As shown in FIG. 4, the third circulation channel 53 includes a tank 531, the pump PU (inflow chamber PU3), a cooling structure 55, a heat exchanging device 54 (heat dissipating portions 544 and 545), and these. A plurality of connecting members CN to be connected.
Among these, the plurality of connecting members CN are tubular members through which the third refrigerant RE3 can flow in the same manner as the connecting member CM. The components of the third refrigerant RE3 may be the same as or different from the components of the second refrigerant RE2.

The tank 531 is connected to the heat radiating unit 545 of the heat exchange device 54, and temporarily stores the third refrigerant RE3. By storing the third refrigerant RE3 in this way, the third refrigerant RE3 mixed with air and impurities is prevented from flowing into the pump PU (inflow chamber PU3), and the third refrigerant RE3 is cooled. The
As described above, the pump PU pressure-feeds the third refrigerant RE3 that has flowed into the inflow chamber PU3 from the tank 531 to the cooling structure by the pressure-feeding unit PU1. The third refrigerant RE3 pumped by the pump PU is cooled through the cooling structure 55, and the heat of the second refrigerant RE2 is transmitted through the heat radiating portions 544 and 545 of the heat exchange device 54, and then stored in the tank 531 again. Is done.

[Configuration of cooling structure]
The cooling structure 55 cools the third refrigerant RE3. The cooling structure 55 includes a heat exchanger 551 and a cooling fan 552.
Among these, the cooling fan 552 sends the surrounding cooling gas in the exterior housing 2 to the heat exchanger 551, and cools the heat exchanger 551, and thus the third refrigerant RE3 flowing through the heat exchanger 551. . The cooling gas to which the heat of the heat exchanger 551 has been transmitted is discharged to the outside of the exterior casing 2 through the exhaust port formed in the left side surface portion 25 (see FIG. 1).

  The heat exchanger 551 is a radiator that cools the third refrigerant RE3 that circulates inside. Although not shown in detail in the heat exchanger 551, an introduction part connected to the inflow chamber PU3 via a connection member CN, a lead-out part connected to the heat dissipation part 544 via a connection member CN, Have The heat exchanger 551 cools the third refrigerant RE3 by receiving heat from the third refrigerant RE3 in a process in which the third refrigerant RE3 introduced through the introduction unit flows through the inside. The third refrigerant RE3 cooled in this way is circulated to the heat radiating portion 544 via the lead-out portion and the connection member CN.

[Effect of the first embodiment]
The projector 1 according to the present embodiment described above has the following effects.
The first refrigerant RE1 that circulates in the first circulation channel 51 formed in the first space S1 in the first sealed casing 511 is supplied by the radiator 521 provided on the first channel of the second circulation channel 52. To be cooled. According to this, the light modulation device 341, the incident-side polarizing plate 342, the outgoing-side polarizing plate 343, and the polarization conversion element 325, which are the first cooling targets, can be efficiently cooled by the first refrigerant RE1 having a low temperature. Furthermore, when the second refrigerant RE2 circulating through the second circulation channel 52 flows through the second channel, the light modulation device 341 that is also the second cooling target can be efficiently cooled.
The heat of the second refrigerant RE2 is transmitted to the third refrigerant RE3 that circulates through the third circulation channel 53 by the heat exchange device 54, and the third refrigerant RE3 is cooled by the cooling structure 55.
Therefore, the second refrigerant RE2 having a relatively low temperature can efficiently cool the first refrigerant RE1, that is, the first cooling target and the second cooling target. In addition, since the first refrigerant RE1, the second refrigerant RE2, and the third refrigerant RE3 circulate through the corresponding circulation passages, the cooling state of these cooling targets can be maintained.

  The light modulation device 341 that is the second cooling target is located in the first space S1. According to this, as described above, the light modulation device 341 is not only cooled by the second refrigerant RE2, but is also cooled by the first refrigerant RE1 circulating in the first space S1. Thereby, the light modulation device 341 can be cooled more efficiently.

  The heat exchange device 54 includes a heat receiving unit 541 that receives heat from the second refrigerant RE2 that flows through the inside, a heat radiating unit 544 and 545 through which the third refrigerant RE3 flows, and a heat radiating unit 544 that receives the heat received by the heat receiving unit 541. And a thermoelectric conversion element TC that conducts to 545. The heat radiating units 544 and 545 transmit the transmitted heat of the second refrigerant RE2 to the third refrigerant RE3 that circulates inside. According to this, the heat of the second refrigerant RE2 can be efficiently transferred to the third refrigerant RE3. Therefore, since the second refrigerant RE2 can be reliably cooled, the first refrigerant RE1 in the first space, that is, the first cooling object and the second cooling object can be efficiently cooled.

  The first refrigerant RE1 in the first space S1 is circulated by the circulation fan 512 provided in the first space S1. Therefore, the first refrigerant RE1 is reliably circulated through the light modulation device 341, the incident-side polarizing plate 342, the outgoing-side polarizing plate 343, and the polarization conversion element 325, which are the first objects to be cooled, located in the first space S1. Can be cooled efficiently.

  A part of the first space S1 formed inside the first sealed casing 511 is formed by a field lens 340 that is an optical component supported by the optical component casing 36 in addition to the optical component casing 36. Is done. According to this, the member which separates 1st space S1 and another space is omissible. Therefore, the number of parts can be reduced, and the first sealed casing 511 and thus the projector 1 can be downsized.

[Second Embodiment]
Next, a second embodiment of the present invention will be described.
The projector according to the present embodiment has the same configuration as the projector 1 described above. Here, in the projector 1, the third refrigerant RE <b> 3 that circulates through the third circulation flow path 53 is used as a refrigerant that radiates heat transferred from the second refrigerant RE <b> 2 by the cooling structure 55. On the other hand, in the projector according to the present embodiment, the third refrigerant RE3 cools another cooling target (third cooling target). In this respect, the projector according to the present embodiment is different from the projector 1 described above. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 6 is a schematic diagram showing the cooling device 6 of the projector 1A according to the present embodiment.
The projector 1A according to the present embodiment has the same configuration and function as the projector 1 except that the projector 1A includes the cooling device 6 instead of the cooling device 5.
As shown in FIG. 6, the cooling device 6 has a fourth circulation channel 64 in addition to a third circulation channel 63 and a cooling structure 65 instead of the third circulation channel 53 and the cooling structure 55. That is, the cooling device 6 includes a first circulation channel 51, a second circulation channel 52, a third circulation channel 63 and a fourth circulation channel 64, a heat exchange device 54 and a cooling structure 65.

[Configuration of Fourth Circulation Channel]
Here, the fourth circulation channel 64 will be described first.
The fourth circulation channel 64 circulates the fourth refrigerant RE4 that is a gas in the second space S2 formed by the second sealed casing 641, and cools the cooling target that is also located in the second space S2. It is a flow path. The fourth circulation channel 64 includes the second sealed casing 641 and a circulation fan 642 disposed in the second sealed casing 641. The fourth refrigerant RE4 may have the same component as or different from the first refrigerant RE1.

The second sealed casing 641 is a casing that forms a second space S2 that is substantially sealed inside. In the second sealed casing 641, at least the light diffusing device 47 and the wavelength converting device 49 among the light source devices 31 are arranged. As a result, the outer casing 2 is connected to the light diffusing device 47 and the wavelength converting device 49. It is suppressed that the dust in the inside adheres. The light diffusion device 47 and the wavelength conversion device 49 are the fourth cooling targets.
A radiator 631 that constitutes the third circulation channel 63 is disposed in the second sealed casing 641. As will be described in detail later, the radiator 631 cools the fourth refrigerant RE4 that is the second cooling target included in the third cooling target.

The circulation fan 642 is a fan that circulates the fourth refrigerant RE4 in the second sealed casing 641. The circulation fan 642 is disposed in the vicinity of the radiator 631, and causes the fourth refrigerant RE4 cooled by the radiator 631 to flow through the light diffusion device 47 and the wavelength conversion device 49, thereby cooling the devices 47 and 49. To do.
In FIG. 6, the fourth refrigerant RE4 flows through the light diffusing device 47 and then through the wavelength conversion device 49. However, the present invention is not limited to this, and the flow order of the fourth refrigerant RE4 may be reversed, and the fourth refrigerant RE4 may flow through the light diffusing device 47 and the wavelength conversion device 49.

[Configuration of third circulation channel]
Similar to the third circulation channel 53, the third circulation channel 63 is a channel through which the third refrigerant RE3 to which heat is transmitted from the second refrigerant RE2 circulates, and is transmitted to the third refrigerant RE3. In addition to releasing heat, the fourth refrigerant RE4 in the second sealed casing 641 and the light source unit 400 are cooled. The third circulation flow path 63 includes a tank 531, a pump PU (inflow chamber PU3), a radiator 631, a cooling unit 632, a cooling structure 65, and heat radiation units 544 and 545 of the heat exchange device 54, and a plurality of connections for connecting them. And a member CN.

As described above, the tank 531 is connected to the heat radiating part 545 via the connection member CN, and temporarily stores the third refrigerant RE3 to which the heat of the second refrigerant RE2 is transmitted by the heat radiating parts 544 and 545.
As described above, the third refrigerant RE3 stored in the tank 531 flows into the inflow chamber PU3. And the 3rd refrigerant | coolant RE3 pumped from inflow chamber PU3 by pumping part PU1 distribute | circulates to the radiator 631 arrange | positioned in the said 2nd sealed housing | casing 641 via the connection member CN.

  The radiator 631 is a heat exchanger that receives heat from the fourth refrigerant RE4 circulating in the second sealed casing 641 and cools the fourth refrigerant RE4. The radiator 631 has a configuration similar to that of the radiator 521, and a flow path through which the third refrigerant RE3 pumped from the pump PU through the connection member CN flows is formed. Such a radiator 631 is a second space cooling unit, and the fourth refrigerant RE4 cooled by the radiator 631 is a second space cooling target included in the third cooling target.

[Configuration of cooling section]
FIG. 7 is a perspective view showing one solid light source module SM among the plurality of solid light source modules SM constituting the solid light source array SA. FIG. 8 is a cross-sectional view showing the solid light source module SM.
The cooling unit 632 corresponds to a second external space cooling unit, and a plurality of solid light sources SA (see FIG. 3) of the first light source unit 401 and the second light source unit 402 included in the light source unit 400. Each of the light source modules SM is configured. Specifically, as shown in FIGS. 7 and 8, the solid light source module SM supports a plurality of solid light sources SS, each of which is a heat generating unit, and the plurality of solid light sources SS, and the third circulating in the interior. And a cooling unit 632 that cools the plurality of solid light sources SS with the refrigerant RE3.

The cooling unit 632 includes a heat transfer unit 6321 and a flow unit 6327 (see FIG. 8), which are integrated.
The heat transfer unit 6321 transfers heat from a plurality of disposed solid light sources SS (laser elements). The heat transfer portion 6321 is formed in a substantially rectangular parallelepiped shape from a material having a relatively high thermal conductivity, and is formed of aluminum in the present embodiment.

Such a heat transfer portion 6321 includes a plurality of concave portions 6322, a plurality of hole portions 6323, a plurality of groove portions 6324, and connection portions 6325 and 6326.
Among these, the connection parts 6325 and 6326 are parts to which the connection member CN is connected, respectively. As shown in FIG. 7, the connection portion 6325 protrudes from the side surface 6321A on one end side in the longitudinal direction in the heat transfer portion 6321, and the connection portion 6326 protrudes from the side surface 6321B on the other end side.

  The plurality of recesses 6322 are each formed in a shape cut out in a substantially cylindrical shape. As shown in FIG. 7, these recesses 6322 are formed in two rows of five along the longitudinal direction of the heat transfer portion 6321. Solid light sources SS are inserted into the recesses 6322, respectively. In a state where the solid light source SS is disposed in the heat transfer unit 6321, as shown in FIG. 8, the element unit SS1 of the solid light source SS is disposed in the recess 6322. The stem SS11 in the element portion SS1 is in contact with the bottom of the concave portion 6322 so that heat can be transferred, and heat generated in the element portion SS1 is transmitted to the heat transfer portion 6321. Note that the number and arrangement of the recesses 6322 in one heat transfer unit 6321 can be changed as appropriate.

As shown in FIG. 8, the plurality of holes 6323 are formed at the bottom of each recess 6322, and the terminal portion SS2 of the solid light source SS is inserted therein. The distal end portion of the terminal portion SS2 protrudes toward the groove portion 6324 communicating with the concave portion 6322 through the hole portion 6323. Although not shown in detail, the hole portion 6323 is formed in a long hole shape having a long diameter in the longitudinal direction of the heat transfer portion 6321. Of the two terminals included in the terminal portion SS2 inserted into the hole 6323, the direction from one to the other is the direction along the longitudinal direction.
The plurality of groove portions 6324 are formed in two rows along the longitudinal direction of the heat transfer portion 6321 on the surface opposite to the opening side of the concave portion 6322. In these groove parts 6324, a printed circuit board (not shown) connected to the terminal part SS2 inserted through the hole part 6323 is arranged. The printed board may be a flexible printed board.

As shown in FIG. 8, the circulation part 6327 is a flow path that penetrates the heat transfer part 6321 along the longitudinal direction. In the circulation part 6327, the third refrigerant RE3 that has passed through the radiator 631 passes through the connection part 6325. The heat of each solid light source SS transmitted to the heat transfer unit 6321 is transmitted to the third refrigerant RE3 in the process of passing through the circulation unit 6327. Then, the third refrigerant RE3 is discharged to the outside via the connection portion 6326 and flows to the cooling structure 65. Thereby, the heat transfer part 6321 and by extension, solid light source SS are cooled.
The circulation part 6327 is located closer to the terminal part SS2 than the element part SS1 disposed in the recess 6322. As a result, the circulation portion 6327 is located near the portion (element mounting portion) on the terminal portion SS2 side where the temperature is high in the element portion SS1 during lighting, and the cooling efficiency of the solid light source SS is increased. In addition, since the flow portion 6327 is located in a portion that is likely to become a dead space in the heat transfer portion 6321, an increase in size of the heat transfer portion 6321 is suppressed. However, the present invention is not limited to this, and the position of the distribution unit 6327 can be changed.

By combining a plurality of such solid-state light source modules SM having the cooling unit 632, each solid-state light source array SA of the first light source unit 401 and the second light source unit 402 is configured.
The third refrigerant RE3 that has passed through the radiator 631 may be supplied to one of the first light source unit 401 and the second light source unit 402 first, and may be supplied to the other later. The third refrigerant RE3 that has passed through the radiator 631 The RE 3 may be divided and supplied to the light source units 401 and 402. Further, the cooling unit 632 of each solid light source module SM that constitutes each light source unit 401, 402 may be connected in series via a connection member CN or the like, and the third refrigerant RE3 that is divided according to each of the cooling units 632 It may be distributed.

[Configuration of cooling structure]
The cooling structure 65 cools the circulated third refrigerant RE3 in the same manner as the cooling structure 55, and the cooled third refrigerant RE3 is radiated from the heat radiating portion 544 of the heat exchange device 54 via the connection member CN. Distributed. The cooling structure 65 includes a heat exchanger 651 and a cooling fan 654, as shown in FIG.

Similarly to the heat exchanger 551, the heat exchanger 651 receives heat from the third refrigerant RE3 that circulates inside, and cools the third refrigerant RE3. Unlike the heat exchanger 551, the heat exchanger 651 includes a first heat exchanger 652 and a second heat exchanger 653 that can be separated from each other.
The first refrigerant 653 flows into the first heat exchanger 652 through the light source unit 40 (cooling unit 632) through the connection member CN. The third refrigerant RE3 cooled by flowing through the first heat exchanger 652 flows to the second heat exchanger 653 via the other connection member CN.
The second heat exchanger 653 has a configuration similar to that of the first heat exchanger 652, and cools the third refrigerant RE3 that flows through the inside. The third refrigerant RE3 cooled by the second heat exchanger 653 flows to the heat radiating portion 544 of the heat exchange device 54 via the connection member CN.
Note that the heat exchanger 551 may be employed instead of the heat exchanger 651.

  The cooling fan 654 cools the heat exchanger 651 by blowing the cooling gas in the exterior housing 2 to the heat exchanger 651. The cooling fan 654 includes a first cooling fan 6541 and a second cooling fan 6542 in the present embodiment. Among these, the first cooling fan 6541 blows the cooling gas to the first heat exchanger 652, and the second cooling fan 6542 blows the cooling gas to the second heat exchanger 653. However, the present invention is not limited to this, and the cooling fan 654 may be a single fan.

  In such a third circulation flow path 63, the third refrigerant RE3 stored in the tank 531 is pumped by the pump PU and supplied to the radiator 631 in the second sealed casing 641. As the radiator 631 is cooled, the fourth refrigerant RE4 in the second sealed casing 641 is cooled. The third refrigerant RE3 that has passed through the radiator 631 flows to the cooling unit 632 that constitutes the light source unit 40, and cools the solid light sources SS of the first light source unit 401 and the second light source unit 402. Then, the third refrigerant RE3 is supplied to the cooling structure 65 and cooled, and then flows to the heat radiating portions 544 and 545 of the heat exchange device 54. After the heat of the second refrigerant RE2 is transferred by the heat radiating units 544 and 545, the third refrigerant RE3 is stored again in the tank 531.

[Effects of Second Embodiment]
According to the projector 1A according to the present embodiment described above, the same effects as those of the projector 1 can be obtained, and the following effects can be obtained.
When the second refrigerant RE2 cools the third cooling object in addition to the first refrigerant RE1 and the second cooling object, the temperature of the second refrigerant RE2 becomes high, and the first refrigerant RE1 and the second cooling object are sufficient. There is a possibility that it becomes impossible to cool down.
On the other hand, the third refrigerant RE3 flowing through the third circulation flow path 63 cools the fourth refrigerant RE4, which is the third cooling target (the second space cooling target), via the radiator 631, and the third cooling. The solid-state light source SS that is the target (the second outside-space cooling target) is cooled. According to this, the third cooling target can be cooled by using the third refrigerant RE3 having a sufficiently low temperature to cool the third cooling target. Therefore, the number of objects to be cooled by the cooling device 6 can be increased.

  The third refrigerant RE3 cools the fourth refrigerant RE4 in the second space S2 that is substantially sealed by the second sealed casing 641, and the third circulation channel 63 is cooled by the third refrigerant RE3 that is circulated. It has a radiator 631 as a second space cooling unit for cooling RE4. According to this, the 4th refrigerant | coolant RE4 in 2nd space S2 can be cooled reliably, and, thereby, the light-diffusion apparatus 47 and the wavelength converter 49 which are the 4th cooling object arrange | positioned in the said 2nd space S2 are made. It can be cooled efficiently. Further, by arranging the light diffusing device 47 and the wavelength conversion device 49 in the second space S2 which is a sealed space, it is possible to suppress dust from being attached to the light diffusing device 47 and the wavelength conversion device 49 and projected. In addition, it is possible to suppress the deterioration of the image, and to prevent dust from adhering to these and causing deterioration.

  In the fourth circulation channel 64, the fourth refrigerant RE4 that cools the light diffusion device 47 and the wavelength conversion device 49 located in the second space S2 circulates. The fourth circulation channel 64 is formed by the second space S2. According to this, the light diffusing device 47 and the wavelength conversion device 49 located in the second space S2 are cooled by the fourth refrigerant RE4 that circulates in the second space S2 and is cooled by the third refrigerant RE3. it can. Therefore, more cooling objects can be cooled.

  The solid light source SS located outside the second space S2 is cooled by a cooling unit 632 serving as a second outside space cooling unit in which the third refrigerant RE3 circulating in the third circulation channel 63 flows. According to this, the solid state light source SS located outside the second space S2 can be cooled by the third refrigerant RE3. Therefore, it is possible to cool more cooling objects.

  The cooling unit 632 includes a heat transfer unit 6321 to which the heat of the disposed solid light source SS is transmitted, and a flow unit that cools the heat transferred to the heat transfer unit 6321 by allowing the third refrigerant RE3 to flow. 6327. According to this, the solid light source SS can be reliably cooled by providing the cooling unit 632 on the third circulation channel 63. Therefore, deterioration of the solid light source SS can be suppressed.

  The solid light source SS is an LD (laser element) disposed in the heat transfer unit 6321, and the flow unit 6327 is configured integrally with the heat transfer unit 6321. According to this, the heat transfer efficiency from the said solid light source SS to the distribution part 6327 can be improved. Therefore, the cooling efficiency of the solid light source SS can be increased.

[Modification of Second Embodiment]
In the second embodiment, the solid light source array SA is configured by combining a plurality of solid light source modules SM. However, the present invention is not limited to this, and one solid-state light source module may constitute at least one of the first light source unit 401 and the second light source unit 402.

FIG. 9 is a perspective view showing a solid light source array SB that is a modification of the solid light source array SA. In FIG. 9, reference numerals are given to a part of the solid light source SS and the concave portion 6322.
For example, a solid light source array SB shown in FIG. 9 may be adopted instead of the solid light source array SA configured by the plurality of solid light source modules SM.
The solid-state light source array SB includes a plurality of solid-state light sources SS and a cooling unit 633 that cools the plurality of solid-state light sources SS with a third refrigerant RE3 that circulates inside.
Among these, the cooling unit 633 includes a heat transfer unit 6331 and a lid 6333, and a circulation unit 6335 including the heat transfer unit 6331 and the lid 6333.

The heat transfer unit 6331 is formed in a substantially square shape in plan view, and supports the plurality of solid light sources SS as well as the heat transfer unit 6321 and functions as a heat receiving member that receives heat from the plurality of solid light sources SS. The heat transfer portion 6331 includes a plurality of recesses 6322 in which the solid light sources SS are respectively disposed, a plurality of holes 6323 (see FIGS. 10 and 11) formed corresponding to the recesses 6322, and the connection portion. 6325 (see FIG. 10) and 6326.
In the heat transfer portion 6331, the plurality of recesses 6322 are positioned at a plurality of concentric positions defined around the center of the surface 6331A opposite to the surface where the lid portion 6333 is located in the heat transfer portion 6331. It is densely formed. Specifically, one recess 6322 is positioned at the center of the surface 6331A, six recesses 6322 are positioned so as to surround the one recess 6322, and 12 more recesses 6322 define the six recesses 6322. It is located so as to surround it. For this reason, when the solid light source SS is disposed in each of the recesses 6322, a light flux is emitted from the heat transfer portion 6331 so that the irradiation region with respect to the plane orthogonal to the optical axis is substantially circular.
In addition, the number and arrangement | positioning of the recessed part 6322 and solid light source SS in the heat transfer part 6331 are not restricted above, and can be changed suitably.

FIG. 10 is a perspective view of the solid light source array SB (heat transfer unit 6331) viewed from the side opposite to the opening side of the recess 6322. FIG. FIG. 11 is a cross-sectional view showing the solid light source array SB. In FIGS. 10 and 11, the solid light source SS and a part of the recess 6322 are also denoted by reference numerals.
In addition to the above-described configuration, the heat transfer unit 6331 has a groove 6332 as shown in FIGS. 10 and 11.
As shown in FIG. 10, the groove 6332 is formed on the surface 6331B of the heat transfer portion 6331 opposite to the surface 6331A, and the circulation portion 6335 is formed by attaching the lid portion 6333 to the heat transfer portion 6331. Is done. Four groove portions 6332 are formed from one side surface 6331C side to the other side surface 6331D side of the heat transfer portion 6331 so as to avoid each hole 6323.
These groove portions 6332 communicate with the outside through a connection portion 6325 on the side surface 6331C side and a connection portion 6326 on the side surface 6331D side. Then, the third refrigerant RE3 flows into the groove portion 6332 through one of the connection portions 6325 and 6326, and the third refrigerant RE3 flows while filling each groove portion 6332, and passes through the other connection portion. It is discharged to the outside.

The lid portion 6333 is attached to the heat transfer portion 6331 so as to close the groove portion 6332, and constitutes a flow portion 6335 together with the groove portion 6332. The lid portion 6333 has a plurality of hole portions 6334 into which a part of the terminal portion SS2 disposed in the concave portion 6322 is inserted.
Such a cover part 6333 is comprised including the printed circuit board connected with terminal part SS2 of each solid light source SS. Thereby, compared with the case where a printed circuit board is provided separately from the cover part 6333, the increase in the number of parts of the cooling part 633 and by extension, solid-state light source array SB is suppressed.
Note that the printed circuit board may be provided separately from the lid 6333. For example, the printed circuit board may be arranged along the surface of the lid 6333 opposite to the heat transfer unit 6331. Further, in the lid portion 6333, packing may be provided between the groove portion 6332 and the hole portions 6323 and 6334.

The circulation part 6335 is formed by the groove part 6332 and the lid part 6333, and cools the heat transfer part 6331, and thus the solid light source SS, by transferring the heat of the heat transfer part 6331 to the third refrigerant RE3 that circulates inside. . As described above, the third refrigerant RE3 flows into the circulation part 6335 through one of the connection parts 6325 and 6326, and the heat of the heat transfer part 6331 is transferred to the third refrigerant RE3. Then, it is discharged to the outside of the cooling unit 633 through the other connection unit.
The third refrigerant RE3 distributed to the first light source unit 401 and the second light source unit 402 having such a solid light source array SB may be the third refrigerant RE3 that is divided in the same manner as described above, and distributes one of them. The third refrigerant RE3 may be circulated to the other.
Even when such a solid light source array SB is employed instead of the solid light source array SA, the same effects as when the solid light source array SA is employed can be obtained.

[Third Embodiment]
Next, a third embodiment of the present invention will be described.
The projector according to the present embodiment has the same configuration as the projector 1A. Here, in the projector 1 </ b> A, the light source unit 40 (cooling unit 632) is located between the radiator 631 and the cooling structure 65 in the third circulation channel 63. On the other hand, in the projector according to the present embodiment, the light source unit 40 (cooling unit 632) is located between the first heat exchanger 652 and the second heat exchanger 653 of the cooling structure 65. In this respect, the projector according to the present embodiment is different from the projector 1A. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 12 is a schematic diagram showing the cooling device 7 of the projector 1B according to the present embodiment.
The projector 1B according to the present embodiment has the same configuration and function as the projector 1A except that the projector 1B includes the cooling device 7 instead of the cooling device 6.
As shown in FIG. 12, the cooling device 7 has the same configuration and function as the cooling device 6 except that it has a third circulation channel 73 instead of the third circulation channel 63. That is, the cooling device 7 includes a first circulation channel 51, a second circulation channel 52, a third circulation channel 73 and a fourth circulation channel 64, a heat exchange device 54 and a cooling structure 65.

Similarly to the third circulation flow path 63, the third circulation flow path 73 is composed of a tank 531, a pump PU (inflow chamber PU3), a radiator 631, a cooling part 632, a cooling structure 65, and a heat exchange device 54 (heat radiation parts 544, 545). ) And a connecting member CN that connects them. However, in the third circulation channel 73, the circulation order of the third circulation channel 63 and the third refrigerant RE3 is different.
Specifically, in the third circulation flow path 73, as shown in FIG. 12, the third refrigerant RE3 discharged from the radiator 631 flows to the first heat exchanger 652 constituting the cooling structure 65. And the 3rd refrigerant | coolant RE3 cooled with the said 1st heat exchanger 652 is in the cooling part 632 which comprises the 1st light source part 401 of the light source part 40, and the cooling part 632 which comprises the 2nd light source part 402. Divided and distributed. Note that the first light source unit 401 and the second light source unit 402 having the cooling unit 633 may be employed instead of the cooling unit 632, and the third refrigerant RE 3 that has circulated through the first light source unit 401 is used as the second light source unit 402. May be distributed.
The third refrigerant RE3 that has cooled the first light source unit 401 and the second light source unit 402 flows to the second heat exchanger 653 and is cooled. The flow path of the third refrigerant RE3 from the second heat exchanger 653 to the radiator 631 through the heat exchange device 54 (radiating units 544 and 545), the tank 531 and the pump PU is the same as the third circulation flow path 63. The same.

Here, the cooling fan 654 constituting the cooling structure 65 includes the first cooling fan 6541 and the second cooling fan 6542 as described above.
The first cooling fan 6541 blows the cooling gas to the first heat exchanger 652, and the second cooling fan 6542 blows the cooling gas to the second heat exchanger 653. These fans 6541 and 6542 can be driven independently and individually adjust the amount of cooling gas flowing through the first heat exchanger 652 and the amount of cooling gas flowing through the second heat exchanger 653. Is possible.
For this reason, in the present embodiment, the control device CD uses the fans 6541 and 6542 (at least) based on the temperatures of the first light source unit 401 and the second light source unit 402 detected by the temperature detection unit (not shown). The operation of the first cooling fan 6541) is controlled to adjust the air volume of the cooling gas flowing from the fans 6541 and 6542 to the heat exchangers 652 and 653. For example, when the temperatures of the light source units 401 and 402 are higher than normal, the control device CD increases the air volume of the cooling gas circulated from the first cooling fan 6541 to the first heat exchanger 652 than normal. . Thereby, the temperature of the light source unit 40 can be maintained at an appropriate temperature.

Note that the control device CD may control at least the first cooling fan 6541 based on the temperature of at least one of the first light source unit 401 and the second light source unit 402. Further, the control device CD is based on at least one of the temperature of the third refrigerant RE3 flowing through the cooling unit 632 or the cooling unit 633 and the temperature of the third refrigerant RE3 flowing through the cooling unit 632 or the cooling unit 633. It is good also as a structure which controls the 1st cooling fan 6541 at least. That is, the control device CD has passed through the temperature of the first light source unit 401, the temperature of the second light source unit 402, the temperature of the third refrigerant RE3 flowing through the cooling unit 632 or the cooling unit 633, and the cooling unit 632 or the cooling unit 633. The operation of at least the first cooling fan 6541 may be controlled based on a condition including at least one of the temperature of the third refrigerant RE3.
However, the present invention is not limited to this, and the control device CD may be configured to control the operation of each of the fans 6541 and 6542 so that a constant amount of cooling gas is delivered.

[Effect of the third embodiment]
According to the projector 1B according to the present embodiment described above, the same effects as the projector 1A can be obtained, and the following effects can be obtained.
The third refrigerant RE3 is circulated to the cooling unit 632 that cools the solid light source SS of the light source unit 40 after being cooled by the first heat exchanger 652 that is cooled by the cooling gas delivered by the first cooling fan 6541. The According to this, the temperature of the third refrigerant RE3 flowing through the cooling unit 632 can be adjusted by adjusting the amount of cooling gas delivered by the first cooling fan 6541. Therefore, the temperature of the solid light source SS of the light source unit 40 can be adjusted.
Further, the third refrigerant RE3 cooled through the second heat exchanger 653 flows through the heat exchange device 54 that transmits the heat of the second refrigerant RE2 to the third refrigerant RE3. According to this, since the third refrigerant RE3 having a relatively low temperature can be reliably circulated through the heat exchange device 54, the second refrigerant RE2 can be effectively cooled. Therefore, the first refrigerant RE1, the first cooling object, and the second cooling object can be efficiently cooled.

  The control device CD includes the temperature of the first light source unit 401, the temperature of the second light source unit 402, the temperature of the third refrigerant RE3 flowing through the cooling unit 632 or the cooling unit 633, and the third flowing through the cooling unit 632 or the cooling unit 633. The operation of at least the first cooling fan 6541 is controlled based on a condition including at least one of the temperature of the refrigerant RE3. According to this, the 3rd refrigerant | coolant RE3 of the temperature which will be in the cooling state suitable for the 1st light source part 401 and the 2nd light source part 402 as 2nd outside-space cooling object is 2nd to cool these light source parts 401 and 402 It can distribute | circulate to the cooling part 632 or the cooling part 633 as an outside space cooling part. Therefore, the light source units 401 and 402 can be suitably cooled without the light source units 401 and 402 being too hot or too cold. And thereby, each light source part 401,402 can be lighted stably.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described.
The projector according to the present embodiment has the same configuration as the projectors 1A and 1B, but differs from the projectors 1A and 1B in that the flow order of the third refrigerant RE3 in the third cooling flow path of the cooling device is different. . In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 13 is a schematic diagram showing the cooling device 8 of the projector 1C according to the present embodiment.
The projector 1 </ b> C according to the present embodiment has the same configuration and function as the projector 1 </ b> A except that it includes a cooling device 8 instead of the cooling device 6.
As shown in FIG. 13, the cooling device 8 has the same configuration and function as the cooling device 6 except that it has a third circulation channel 83 instead of the third circulation channel 63. That is, the cooling device 8 includes a first circulation channel 51, a second circulation channel 52, a third circulation channel 83 and a fourth circulation channel 64, a heat exchange device 54 and a cooling structure 65.

Similarly to the third circulation flow path 63, the third circulation flow path 83 is a tank 531, a pump PU (inflow chamber PU3), a radiator 631, a cooling unit 632, a cooling structure 65, and a heat exchange device 54 (heat radiation units 544 and 545). ) And a connecting member CN that connects them. However, the third circulation channel 83 is different in the flow order of the third circulation channel 63 and the third refrigerant RE3.
Specifically, in the third circulation channel 83, the third refrigerant RE3 pumped from the pump PU flows to the first heat exchanger 652 that constitutes the cooling structure 65, as shown in FIG. Then, the third refrigerant RE3 cooled by the first heat exchanger 652 flows to the radiator 631 in the second sealed casing 641. The third refrigerant RE3 that has circulated through the radiator 631 is divided and circulated to the cooling unit 632 that forms the first light source unit 401 of the light source unit 40 and the cooling unit 632 that forms the second light source unit 402. Also in this embodiment, the first light source unit 401 and the second light source unit 402 having the cooling unit 633 may be adopted instead of the cooling unit 632, and the third refrigerant RE3 that has passed through one light source unit is used as the other. You may distribute to the light source part.
The third refrigerant RE3 that has cooled the first light source unit 401 and the second light source unit 402 is circulated through the second heat exchanger 653 and cooled, similarly to the cooling device 7. The flow path of the third refrigerant RE3 from the second heat exchanger 653 to the pump PU via the heat exchange device 54 (heat radiation units 544 and 545) and the tank 531 is the same as the third circulation flow path 63. .

Also in this embodiment, the cooling fan 654 constituting the cooling structure 65 includes at least two fans 6541 and 6542. Then, the control device CD includes the temperature of at least one of the light source units 401 and 402, the temperature in the second space S2, the temperature of the third refrigerant RE3 flowing from the first heat exchanger 652 to the radiator 631, and the light source. The operation of each of the fans 6541 and 6542 (at least the first cooling fan 6541) is controlled based on at least one of the temperature of the third refrigerant RE flowing through the second heat exchanger 653 via the units 401 and 402. The air volume of the cooling gas flowing from the fans 6541 and 6542 to the heat exchangers 652 and 653 is adjusted. Thereby, since the temperature of the 3rd refrigerant | coolant RE3 distribute | circulated to the radiator 631 is adjusted, the temperature in 2nd space S2 and the temperature of the light source part 40 can be maintained at appropriate temperature.
According to the projector 1C according to this embodiment, the same effects as those of the projector 1A can be obtained.

[Modification of Embodiment]
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 above embodiments, the light modulation device 341, the incident side polarizing plate 342, the emission side polarizing plate 343, and the polarization conversion element 325 are given as the first cooling target, and the light modulation device 341 is given as the second cooling target. Further, as the second space cooling object included in the third cooling object, the fourth refrigerant RE4 cooled by the radiator 631 (second space cooling part) is cited, and as the second outside cooling object, the cooling part 632, The solid light source SS of the light source unit 40 cooled by 633 (second outside-space cooling unit) is mentioned. Furthermore, the light diffusion device 47 and the wavelength conversion device 49 are cited as the fourth cooling target. However, the present invention is not limited to this, and each cooling target can be changed as appropriate. For example, the light modulation device 341 may not be included in the first cooling target.

  In each said embodiment, the light modulation apparatus 341 arrange | positioned in the 1st sealed housing | casing 511 was mentioned as 2nd cooling object. However, the present invention is not limited to this, and another configuration arranged outside the first sealed casing 511 may be the second cooling target. In this case, the branch part CM14 provided in the connection member CM1 may not be in the first sealed casing 511.

  In the second to fourth embodiments, the third cooling object is the second space cooling object arranged in the second sealed casing 641 and the second space arranged outside the second sealed casing 641. Including external cooling target. However, the present invention is not limited to this, and the third cooling target cooled by the third refrigerant RE3 may or may not be located in the second sealed casing 641 (second space S2). Furthermore, when the third cooling target is not located in the second sealed casing 641, the second sealed casing 641 may not be provided.

  In the second to fourth embodiments, the light diffusing device 47 and the wavelength conversion device 49 located in the second sealed casing 641 (second space S2) are the fourth circulating flow in the second sealed casing 641. It is assumed that the refrigerant is cooled by the fourth refrigerant RE4 that is a gas circulating in the path. However, the present invention is not limited to this, and the third refrigerant RE3 may be configured to flow through the cooling target located in the second sealed casing 641 as in the light modulation device 341. In this case, the radiator 631 may be omitted.

  In the said 2nd-4th embodiment, solid-state light source SS was arrange | positioned in the cooling parts 632 and 633 which comprise a part of 3rd circulation flow path 63,73,83. However, the present invention is not limited to this, and the cooling section in which the third refrigerant RE3 circulates may be connected to the base member on which the solid light source SS is disposed so that heat can be transferred.

  In the first embodiment, the cooling structure 55 has one heat exchanger 551 and one cooling fan 552. In the second to fourth embodiments, the cooling structure 65 includes a heat exchanger 651 having a first heat exchanger 652 and a second heat exchanger 653, and a first cooling fan 6541 and a second cooling fan 6542. And a cooling fan 654. However, the present invention is not limited to this, and it is only necessary to release the heat of the third refrigerant RE3 to be circulated and cool the third refrigerant RE3. For example, the cooling device 5 may employ the cooling structure 65 instead of the cooling structure 55, and the cooling device 6 may employ the cooling structure 55 instead of the cooling structure 65. Moreover, the number and arrangement | positioning of a heat exchanger and a ventilation fan are not ask | required.

  In each of the above embodiments, the heat exchanging device 54 includes the heat receiving portion 541 sandwiched between the two heat radiating portions 544 and 545 and between the heat receiving portion 541 and the heat radiating portion 544 and between the heat receiving portion 541 and the heat radiating portion 545. In addition, the heat conducting portions 542 and 543 each having the thermoelectric conversion element TC are arranged. However, the present invention is not limited to this. For example, the heat exchange device may be configured to include one heat receiving unit, one heat radiating unit, and a heat conducting unit (thermoelectric conversion element) disposed between the heat receiving unit and the heat radiating unit. Further, there may be no thermoelectric conversion element, and a plurality of thermoelectric conversion elements may be provided. That is, the configuration of the heat exchange device may be another configuration.

  In each of the above embodiments, the circulation fan 512 that circulates the first refrigerant RE1 in the first sealed casing 511 (first space S1) is disposed, and the fourth in the second sealed casing 641 (second space S2). The circulation fan 642 for circulating the refrigerant RE4 is arranged. However, the present invention is not limited to this, and as long as the first refrigerant RE1 and the fourth refrigerant RE4 are circulated, at least one of the circulation fans 512 and 642 may be omitted.

In each of the above embodiments, a part of the first space S1 is formed by the field lens 340. However, the present invention is not limited to this, and the first space S1 may be formed by other optical components or may not be formed by optical components. On the other hand, a part of the second space S2 may be formed by an optical component.
In each of the above embodiments, the pump PU is configured to pump the second refrigerant RE2 and the third refrigerant RE3 that have flowed into the inflow chambers PU2 and PU3 by one pumping unit PU1. However, the present invention is not limited to this, and a pump may be provided separately for the second circulation channel 52 and the third circulation channels 53, 63, 73, 83.
In each of the above embodiments, the light diffusing device 47 has the light diffusing element 471 and the rotating device 472, and the wavelength converting device 49 has the wavelength converting element 491 and the rotating device 495. However, the present invention is not limited to this, and the light diffusion device 47 and the wavelength conversion device 49 may be configured such that the light diffusion element 471 and the wavelength conversion element 491 are not rotated. That is, the rotating devices 472 and 495 may be omitted.

In each of the embodiments described above, the projector 1 includes the three light modulation devices 341 (341B, 341G, and 341R). However, the present invention is not limited to this, and the present invention can also be applied to a projector including two or less or four or more light modulation devices.
In each of the above embodiments, the image projection device 3 has the configuration and shape shown in FIG. However, the present invention is not limited to this, and the image projection device 3 may have another configuration or may be configured in another shape.

  In each of the above embodiments, a light modulation device having a transmissive liquid crystal panel having a light incident surface and a light emission surface different from each other is employed. However, the present invention is not limited to this, and a light modulation device having a reflective liquid crystal panel in which the light incident surface and the light emitting surface are the same may be employed. In addition, as long as the light modulation device can modulate an incident light beam and form an image according to image information, a device using a micromirror, for example, a device using a DMD (Digital Micromirror Device) or the like can be used. A light modulation device may be used.

In each of the embodiments described above, the light source device 31 includes the light source unit 40 that emits the excitation light, the light diffusion device 47 that diffuses a part of the excitation light, and the wavelength conversion of the other part of the excitation light. And a wavelength conversion device 49 for generating. However, the present invention is not limited to this. For example, the light source device 31 does not have the light diffusion device 47 and the wavelength conversion device 49 may emit white light including blue light and fluorescence. Further, the light diffusion device 47 and the wavelength conversion device 49 are not limited to the reflection type, and may be a transmission type. Furthermore, the solid light source SS employed in the light source unit 40 is not limited to the LD, and may be an LED (Light Emitting Diode).
In addition, the light source device 31 may include a light source lamp. In this case, the light source device 31 may include a plurality of light source lamps.

  In each said embodiment, the cooling devices 5-8 were comprised as a cooling device which makes each structure of the image projection apparatus 3 the object of cooling. However, the present invention is not limited to this, and the cooling target of the cooling devices 5 to 8 can be appropriately changed. For example, the power supply device may be the cooling target. Moreover, you may employ | adopt the structure of the cooling devices 5-8 for another electronic device, In this case, you may change the cooling object suitably.

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C ... Projector, 31 ... Light source device, 325 ... Polarization conversion element (first cooling target), 34 ... Electro-optical device, 340 ... Field lens (optical component), 341 (341B, 341G, 341R) ... Light modulator (first cooling object, second cooling object), 342 ... Incident side polarizing plate (first cooling object), 343 ... Outgoing side polarizing plate (first cooling object), 40 ... Light source part (third cooling) Object, second outer space cooling object), 47 ... light diffusion device (fourth cooling object), 49 ... wavelength conversion device (fourth cooling object), 5, 6, 7, 8 ... cooling device, 51 ... first circulation Flow path, 511 ... 1st sealed housing (sealed housing), 512 ... Circulating fan, 513 to 515 ... Blower fan, 52 ... 2nd circulating flow path, 521 ... Radiator, 522 ... Tank, 53, 63, 73, 83 ... Third circulation channel, 531 ... Tank, DESCRIPTION OF SYMBOLS 4 ... Heat exchange apparatus, 541 ... Heat receiving part, 544,545 ... Radiating part, 55, 65 ... Cooling structure, 551 ... Heat exchanger, 552 ... Cooling fan, 631 ... Radiator (2nd space cooling part), 632 633 ... Cooling part (second outer space cooling target), 6321, 6331 ... Heat transfer part, 6327, 6335 ... Distribution part, 652 ... First heat exchanger, 653 ... Second heat exchanger, 6541 ... First cooling fan , 6542, second cooling fan, 64, fourth circulation flow path, CD, control device, CM (CM1, CM2), CN, connection member, CM11, CM12, CM13, flow path forming member, CM14, branching portion, CM15. ... Adjustment part, CM21, CM22, CM23 ... Flow path forming member, CM24 ... Merging part, FC1 ... First flow path, FC2 ... Second flow path, PU ... Pump, PU1 ... Pressure feeding part, PU2, PU3 ... Inflow chamber, E1 ... first refrigerant, RE2 ... second refrigerant, RE3 ... third refrigerant, RE4 ... fourth refrigerant, S1 ... first space, S2 ... second space, SS ... solid light source (laser element), TC ... thermoelectric conversion element , TCA ... endothermic surface, TCB ... heat dissipation surface.

Claims (13)

A first circulation passage through which a first refrigerant that cools the first cooling object disposed in the substantially sealed first space circulates;
A second circulation passage through which a second refrigerant for cooling the first refrigerant circulates;
A third circulation channel through which the third refrigerant circulates;
A heat exchange device for transferring heat of the second refrigerant to the third refrigerant;
A cooling structure for cooling the third refrigerant,
The first circulation channel is formed by the first space,
The first refrigerant is a gas,
The second refrigerant and the third refrigerant are liquids,
The second circulation channel is
A first flow path for cooling the first refrigerant by a part of the second refrigerant;
And a second flow path for cooling the second cooling object by another part of the second refrigerant. The projector according to claim 1.
The projector according to claim 1, wherein the second cooling target is located in the first space. The projector according to claim 1 or 2,
The third circulation channel cools a third cooling target by the third refrigerant to be circulated. The projector according to claim 3.
The third cooling object includes a second space cooling object located in a substantially sealed second space,
The projector according to claim 1, wherein the third circulation flow path includes a second space cooling unit that cools the second space cooling target with the circulated third refrigerant. The projector according to claim 4,
A fourth circulation passage through which a fourth refrigerant for cooling the fourth cooling object located in the second space circulates;
The fourth circulation channel is formed by the second space,
The projector for cooling the second space is the fourth refrigerant. The projector according to claim 4 or 5,
The third cooling object includes a second outside-space cooling object located outside the second space,
The projector according to claim 1, wherein the third circulation flow path includes a second outside-space cooling unit that cools the second outside-space cooling target with the third refrigerant that is circulated. The projector according to claim 6,
The second external cooling unit is
A heat transfer part to which heat of the second outside-space cooling object is transferred;
A projector configured to allow the third refrigerant to flow and to cool the heat transferred to the heat transfer unit. The projector according to claim 7,
The second external space cooling target is a laser element disposed in the heat transfer unit,
The projector is characterized in that the distribution unit is configured integrally with the heat transfer unit. The projector according to any one of claims 6 to 8,
The cooling structure is
A first heat exchanger and a second heat exchanger respectively provided in the third circulation flow path;
A first cooling fan for sending cooling gas to the first heat exchanger;
A second cooling fan for sending cooling gas to the second heat exchanger,
The third refrigerant circulating in the third circulation channel flows through the first heat exchanger, and then flows through the second heat exchanger.
The second external cooling unit is provided between the first heat exchanger and the second heat exchanger,
The projector, wherein the heat exchange device is connected to the second heat exchanger so that the third refrigerant that has passed through the second heat exchanger can flow. The projector according to claim 9.
At least one of the temperature of the second outside-space cooling target, the temperature of the third refrigerant flowing through the second outside-space cooling unit, and the temperature of the third refrigerant flowing through the second outside-space cooling unit And a control device that controls the operation of the first cooling fan. The projector according to any one of claims 1 to 10,
The heat exchange device
A heat receiving portion connected to the second circulation flow path, through which the second refrigerant flows, and receiving heat from the second refrigerant;
A thermoelectric conversion element that has an endothermic surface through which heat of the heat receiving unit is conducted, and that conducts heat of the endothermic surface to a heat dissipation surface;
A projector comprising: a heat radiating portion connected to the third circulation flow path, through which the third refrigerant flows, and radiating heat conducted from the heat radiating surface to the third refrigerant. The projector according to any one of claims 1 to 11,
A projector comprising: a circulation fan that is disposed in the first space and circulates the first refrigerant. The projector according to any one of claims 1 to 12,
A light source device;
A light modulation device that forms an image by modulating light emitted from the light source device;
An optical component disposed on the optical path of the light emitted from the light source device and contributing to image formation by the light modulation device;
A sealed housing that forms the first space therein,
The optical component includes a field lens,
The field lens forms the first space together with the sealed casing.

Images