JP2019008138A - Cooling device and projector - Google Patents

Abstract

A cooling device and a projector that can be reduced in size are provided. A cooling device includes a heat radiating member that radiates heat transmitted from a cooling target, a supply side duct that supplies cooling gas to the heat radiating member, and a discharge side duct that discharges cooling gas that has cooled the heat radiating member. A circulation device that circulates the cooling gas to the heat radiating member through the supply side duct, and the heat radiating member has a plurality of fins through which the cooling gas circulates, and is a supply line that is the center line of the supply side duct The center line is inclined with respect to the normal of the inflow surface defined by the end of the cooling gas inflow side in the plurality of fins, and the discharge side center line, which is the center line of the discharge side duct, is cooled in the plurality of fins. Inclined with respect to the normal of the outflow surface defined by the end of the gas outflow side, the supply side center line and the discharge side center line intersect at an angle of less than 180 °. [Selection] Figure 4

Description

  The present invention relates to a cooling device and a projector.

Conventionally, a light source unit, an optical unit that uniformizes the illuminance distribution of light from the light source unit, separates and combines colors to form an image, and a projection lens that enlarges and projects an image formed by the optical unit Are known (see, for example, Patent Document 1).
The projector described in Patent Document 1 has a cooling structure that cools the light source unit by air. The cooling structure includes an inner cooling fan that cools the inside of the lamp, an outer cooling fan that cools the outside, and a projector. And an intake fan that sucks external cooling air through an intake port formed in the front. Then, the cooling air introduced into the projector by the intake fan is sucked by the inner cooling fan and the outer cooling fan. Among these, the inner cooling fan distributes the sucked cooling air to the inside of the lamp house, and the outer cooling fan distributes the sucked cooling air to the outside of the lamp house. The cooling air that has cooled the lamp by the inner cooling fan and the outer cooling fan is discharged from an exhaust port formed on the rear surface of the projector.

JP 2014-48354 A

In the projector described in Patent Document 1, the intake port for introducing cooling air into the interior and the exhaust port for discharging cooling air that has cooled the lamp to the outside are located on the opposite surface of the projector. For this reason, the cooling air whose temperature has been increased by cooling the lamp is prevented from being introduced into the interior again through the air inlet.
However, in such a configuration, the cooling air circulates through the exterior casing of the projector from one end side to the other end side, so that the arrangement space for the cooling structure tends to be large in the exterior casing. In particular, when a duct that guides cooling air introduced into the cooling target or a duct that guides cooling air that cools the cooling target to the outside is provided, the arrangement space is likely to be further increased.
For this reason, the structure which can aim at size reduction of a projector has been requested | required, suppressing that the cooling gas discharged | emitted outside is introduce | transduced into an inside again.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and to provide a cooling device and a projector that can be reduced in size.

  The cooling device according to the first aspect of the present invention includes a heat dissipating member that dissipates heat transmitted from a cooling target, a supply-side duct that supplies cooling gas to the heat dissipating member, and the cooling gas that cools the heat dissipating member. A discharge side duct to be discharged and a flow device for flowing the cooling gas to the heat radiating member through the supply side duct, and the heat radiating member has a plurality of fins through which the cooling gas flows. The supply side center line, which is the center line of the supply side duct, is inclined with respect to the normal of the inflow surface defined by the cooling gas inflow end portions of the plurality of fins, and the discharge side duct The discharge-side center line that is the center line of the plurality of fins is inclined with respect to the normal line of the outflow surface defined by the cooling gas outflow-side ends of the plurality of fins, and the supply-side center line and the discharge-side center line The line is 180 ° Characterized in that intersect at an angle of full.

According to such a configuration, since the cooling device has the supply side duct, the cooling gas can be smoothly circulated to the heat radiating member. Moreover, since the cooling device has the discharge side duct, the cooling gas that has cooled the heat radiating member can be discharged without stagnation.
Further, the supply side center line and the discharge side center line intersect at an angle of less than 180 °. From this, when the supply side center line and the discharge side center line are parallel to each other, the flow length of the cooling gas in the supply side duct is the same, and the flow length of the cooling gas in the discharge side duct is the same. Even in this case, it is possible to reduce the dimension between the end portions of the supply side duct and the discharge side duct that are separated from each other. For this reason, a cooling device can be reduced in size.
And the cooling gas of the location away from the discharge side duct is introduced into the supply side duct, and the cooling gas is discharged from the discharge side duct in a direction away from the supply side duct. According to this, it can suppress that the cooling gas discharged | emitted from the discharge side duct flows in in a supply side duct.
Accordingly, the cooling device can be reduced in size while suppressing the performance deterioration of the cooling device due to the re-introduction of the discharged cooling gas, and when it is provided in an electronic device such as a projector, The space for arranging the cooling device can be reduced.

In the first aspect, each of the plurality of fins preferably includes a first plate-like portion along the supply-side center line and a second plate-like portion along the discharge-side center line.
According to such a configuration, the surface area of the fins can be increased as compared with the case where the heat dissipation member has a plurality of fins orthogonal to either the inflow surface or the outflow surface. It is possible to facilitate the flow of the cooling gas into the tank. Therefore, the heat dissipation performance of the heat dissipation member can be improved.

In the first aspect, the crossing angle of the supply side center line with respect to the normal line of the inflow surface is 30 ° or more and 60 ° or less, and the crossing angle of the discharge side center line with respect to the normal line of the outflow surface is It is preferably 30 ° or more and 60 ° or less.
Here, the surface area of the fins increases as the crossing angle of the supply-side center line and the crossing angle of the discharge-side center line increase.
On the other hand, when each of the above-mentioned crossing angles becomes larger, the flow path when the cooling gas flowing along the first plate-like portion flows along the second plate-like portion becomes sharper, and the flow passage also becomes Since it becomes long, the pressure loss of cooling gas becomes large and the air volume which distribute | circulates between fins reduces. For this reason, the heat transfer rate of the heat radiating member decreases.
Further, the thermal resistance of the heat radiating member decreases as each of the above-described crossing angles increases, but the decrease in thermal resistance does not decrease so much even when the respective inclination angles increase.
Accordingly, the supply-side duct and the discharge-side duct are arranged so that each of the above-described crossing angles is 30 ° or more and 60 ° or less, and the first plate-like portion and the second plate-like portion are formed. Thereby, it can suppress that the cooling gas discharged | emitted from the discharge side duct flows in into a supply side duct again. Therefore, the performance degradation of the cooling device can be suppressed, and the cooling device can be downsized.

In the first aspect, the inflow surface and the outflow surface are parallel to each other, the intersection angle of the supply side center line with respect to the normal line of the inflow surface, and the discharge side center with respect to the normal line of the outflow surface. It is preferable that the angle intersects the line.
The inflow surface and the outflow surface being parallel to each other include the case where the inflow surface and the outflow surface can be determined to be parallel to each other in addition to the completely parallel surfaces to each other. In addition, the intersection angle of the supply side center line with the inflow surface normal line and the intersection angle of the discharge side center line with respect to the outflow surface normal line coincide with each other when these intersection angles are completely the same. , Including the case where it can be determined that they match.
According to such a configuration, compared to the case where the supply-side center line and the discharge-side center line are in contact with the normal line of the inflow surface at different angles, the plurality of fins, and thus the heat dissipation member are compared. Can be formed easily.

A projector according to a second aspect of the present invention is a projector that projects an image, and includes the cooling device.
According to the said 2nd aspect, there can exist an effect similar to the cooling device which concerns on the said 1st aspect, Thereby, size reduction of a projector provided with the said cooling device can be achieved.

In the second aspect, a light source device, a light modulation device that modulates light emitted from the light source device to form the image, a projection optical device that projects the image formed by the light modulation device, and It is preferable that the component of the light source device is the cooling target.
According to such a configuration, the light source device that generates relatively high heat in the configuration of the projector can be cooled.

In the second aspect, it is preferable that the light source device includes a substrate on which a light source is mounted, the substrate is the object to be cooled, and heat of the substrate is transmitted to the heat dissipation member.
Here, the substrate on which the light source is mounted is a component that is susceptible to heat, while the temperature tends to be relatively high.
On the other hand, according to the said structure, the said board | substrate can be cooled by thermally radiating the heat | fever of a board | substrate with the said thermal radiation member. Therefore, the substrate, and thus the light source device can be cooled stably.

In the second aspect, an exterior casing constituting an exterior is provided, and the exterior casing introduces the cooling gas outside the exterior casing into the inside, and the cooling gas in the exterior casing is externally provided. The exhaust port is connected to an end of the supply side duct opposite to the heat dissipation member, and the exhaust port is connected to the heat dissipation member in the discharge side duct. It is preferable to be connected to the opposite end.
According to such a configuration, the introduction port to which the supply side duct is connected and the exhaust port to which the discharge side duct is connected are located on one side surface of the exterior casing. According to this, the introduction port and the exhaust port can be made inconspicuous. Therefore, the appearance of the projector can be improved.

In the second aspect, the exterior casing has a first surface portion positioned in a projection direction of the image, a second surface portion positioned on the opposite side of the first surface portion, and an installation surface on which the projector is installed. The third surface portion facing the fourth surface portion located on the opposite side of the third surface portion, and the first surface portion, the second surface portion, the third surface portion, and the fourth surface portion are connected at one end side. And a sixth surface portion connecting the first surface portion, the second surface portion, the third surface portion, and the fourth surface portion on the other end side, and the side surface includes the fifth surface portion and the fifth surface portion. It is preferable that it is one side of a 6th surface part.
According to such a configuration, the cooling gas can be discharged from the exhaust port in a direction different from the image projection direction by the projector. Therefore, it is possible to suppress the distortion of the projected image due to the so-called positive flame and to suppress the deterioration of the image.

In the said 2nd aspect, it is preferable to have the rectification | straightening member which rectifies | straightens the said cooling gas which is provided in the opening of at least one of the said inlet and the said exhaust port, and distribute | circulates the said opening.
For example, if a rectifying member is provided at the inlet, the cooling gas at a position away from the exhaust outlet can be easily circulated through the inlet. Moreover, if the exhaust port is provided with a rectifying member, the cooling gas can be easily discharged in a direction away from the introduction port. Therefore, it can suppress that the discharged | emitted cooling gas is again introduce | transduced in an exterior housing | casing via an inlet.

1 is a perspective view showing a projector according to an embodiment of the invention. The schematic diagram which shows the structure of the image projection apparatus in the said embodiment. The schematic diagram which shows the structure of the light source device in the said embodiment. The schematic diagram which shows arrangement | positioning of the cooling device in the exterior housing | casing in the said embodiment. The schematic diagram which shows the structure of the cooling device in the said embodiment. The graph which shows the change of the dimension of the fin according to the angle (crossing angle) in the said embodiment. The graph which shows the change of the surface area of the heat radiating member according to the angle (crossing angle) in the said embodiment. The graph which shows the change of the heat transfer rate of the heat radiating member according to the angle (crossing angle) in the said embodiment. The graph which shows the change of the thermal resistance of the heat radiating member according to the angle (crossing angle) in the said embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Schematic configuration of projector]
FIG. 1 is a perspective view showing a projector 1 according to this embodiment.
The projector 1 according to the present embodiment modulates light emitted from the light source device 4 provided therein to form an image according to image information, and enlarges and projects the image on a projection surface such as a screen. An image display device. As shown in FIG. 1, the projector 1 includes an exterior housing 2 that constitutes an exterior. As will be described in detail later, such a projector 1 has one of the features in the configuration of the cooling device 5 that cools the cooling target.
Hereinafter, each configuration of the projector 1 will be described in detail.

[Configuration of exterior casing]
The exterior housing 2 includes 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, and is formed in a substantially rectangular parallelepiped shape as a whole. Among these, the top surface portion 21 and the bottom surface portion 22 correspond to the fourth surface portion and the third surface portion, and the front surface portion 23 and the back surface portion 24 correspond to the first surface portion and the second surface portion. The left side surface portion 25 corresponds to one of the fifth surface portion and the sixth surface portion, and the right side surface portion 26 corresponds to the other of the fifth surface portion and the sixth surface portion.
Among these, the bottom surface portion 22 is a surface facing the installation surface when the projector 1 is installed on the installation surface. The top surface portion 21 is a surface opposite to the bottom surface portion 22.
The front part 23 has an opening 231 that exposes an end part on the light emission side of the projection optical device 35 to be described later. The opening portion 231 is located on the right side surface portion 26 side in the front surface portion 23. That is, the front part 23 is a surface located in the image projection direction in the exterior housing 2. The back surface portion 24 is a surface opposite to the front surface portion 23.
Although the illustration of the left side surface portion 25 is omitted in FIG. 1, the inlet 251 (see FIG. 4) for introducing the cooling gas into the exterior housing 2 and the exhaust port 252 (see FIG. 4) for discharging the cooling gas that has cooled the object to be cooled. 4). That is, the left side surface portion 25 corresponds to the side surface of the present invention. The right side surface portion 26 is a surface opposite to the left side surface portion 25.

[Configuration of image projection apparatus]
FIG. 2 is a schematic diagram showing the configuration of the image projection apparatus 3.
As shown in FIG. 2, an image projection device 3 and a cooling device 5 (see FIG. 4) are arranged in the exterior housing 2. In addition, although not shown, a control device that controls the projector 1 and a power supply device that supplies power to the electronic components are disposed in the exterior housing 2.

The image projection device 3 forms and projects an image according to the image information under the control of the control device. The image projection device 3 includes a light source device 4, a uniformizing device 31, a color separation device 32, a relay device 33, an image forming device 34, a projection optical device 35, and an optical component housing 36. It is configured as an optical unit.
Among these, the configuration of the light source device 4 will be described in detail later.

The homogenizer 31 uniformizes the illuminance in a plane perpendicular to the central axis of the light beam incident from the light source device 4. The homogenizer 31 includes a first lens array 311, a dimmer 312, a second lens array 313, a polarization conversion element 314, and a superimposing lens 315 in the order of incidence of light beams from the light source device 4. The dimmer 312 may not be provided.
The color separation device 32 separates the light beam incident from the uniformizing device 31 into three color lights of red (R), green (G), and blue (B). The color separation device 32 includes dichroic mirrors 321 and 322, a reflection mirror 323, and lenses 324 and 325.
The relay device 33 is provided on an optical path of red light having a longer optical path than that of green light and blue light among the three separated color lights. The relay device 33 includes an incident side lens 331, a relay lens 333, and reflection mirrors 332 and 334.

The image forming apparatus 34 modulates the separated color lights according to the image information, and then combines the color lights to form image light. The image forming apparatus 34 includes a field lens 341, an incident side polarizing plate 342, a light modulation device 343, an output side polarizing plate 344, and one color composition device 345 that are provided according to each color light.
Among these, the light modulation device 343 (respectively, the light modulation devices for red, green, and blue are set to 343R, 343G, and 343B) respectively modulate incident color light and form image light according to image information. To do. In the present embodiment, the light modulation device 343 includes a transmissive liquid crystal panel in which the incident surface on which the corresponding color light is incident and the emission surface on which the modulated light is emitted are opposite to each other.
The color synthesis device 345 synthesizes the image light modulated by each light modulation device 343. In the present embodiment, the color synthesizing device 345 is configured by a cross dichroic prism, but can also be configured by a plurality of dichroic mirrors.

  The projection optical device 35 enlarges and projects the image light incident from the image forming device 34 onto the projection surface. Although not shown, the projection optical device 35 can be configured as a combined lens having a plurality of lenses and a lens barrel that houses the plurality of lenses.

The optical component housing 36 accommodates the devices 31 to 33 and the field lens 341 therein.
Here, the illumination optical axis Ax, which is a designed optical axis, is set in the image projection apparatus 3, and the optical component housing 36 is placed at a predetermined position on the illumination optical axis Ax. And the field lens 341 is held. The light source device 4, the image forming device 34, and the projection optical device 35 are disposed at predetermined positions on the illumination optical axis Ax.

[Configuration of light source device]
FIG. 3 is a cross-sectional view schematically showing the configuration of the light source device 4.
The light source device 4 emits a white light beam to the homogenizing device 31 as described above. As shown in FIG. 3, the light source device 4 includes a light source unit 41, an afocal optical element 42, a homogenizer optical element 43, a condensing element 44, a wavelength conversion element 45, a collimating element 46, and a guide member 47.

The light source unit 41 emits excitation light that is blue light. The light source unit 41 is configured as a solid light source array having a substrate 411, a solid light source 412 as a light source and a parallelizing lens (not shown) each mounted in a matrix on the mounting surface 411A of the substrate 411. ing.
In the present embodiment, an LD (Laser Diode) that emits excitation light having a peak wavelength of 440 nm is employed as the solid-state light source 412. However, the present invention is not limited to this, and an LD that emits excitation light having a peak wavelength of 446 nm or excitation light having a wavelength of 460 nm may be employed. In addition, LDs that emit excitation light having different peak wavelengths may be mixed. Further, as the solid light source 412, another solid light source such as an LED (Light Emitting Diode) may be adopted instead of the LD. The excitation light emitted from such a solid light source 412 is collimated by the collimating lens and is incident on the afocal optical element 42.
Part of the substrate 411 is exposed to the outside of the light source device 4 (guide member 47), and the connection member 56 (see FIG. 4) of the cooling device 5 is in contact with the exposed portion of the substrate 411. .

  The afocal optical element 42 adjusts (reduces) the beam diameter of the excitation light incident from the light source unit 41. Specifically, the afocal optical element 42 includes a lens 421 that collects excitation light incident as parallel light from the light source unit 41, a lens 422 that collimates and emits excitation light incident from the lens 421, and Have

The homogenizer optical element 43 equalizes the illuminance distribution of the excitation light incident on the wavelength conversion element 45 that is the illuminated area. The homogenizer optical element 43 includes a first multi lens 431 and a second multi lens 432.
The condensing element 44 superimposes the partial light beams emitted from the respective lenses of the second multi-lens 432 on the wavelength conversion element 45.

The wavelength conversion element 45 is excited by incident excitation light and emits light having a wavelength different from the wavelength of the excitation light. In other words, the wavelength conversion element 45 converts incident excitation light into light of another wavelength. In the present embodiment, the wavelength conversion element 45 includes any one of a yellow phosphor, a green phosphor, and a red phosphor, transmits a part of incident excitation light, and transmits another part of the green light and the green phosphor. It is converted into fluorescence containing red light and emitted. For this reason, the light emitted from the wavelength conversion element 45 is white light including blue light, green light, and red light.
The collimating element 46 collimates and emits the white light diffused and emitted from the wavelength conversion element 45.

The guide member 47 is a holding member that positions and holds the light source unit 41 and the elements 42 to 46 described above.
The guide member 47 has a fixing portion 471 to which the substrate 411 is fixed so that a part of the mounting surface 411A is in contact with one end, and an opening portion 472 through which light emitted from the parallelizing element 46 passes. At the other end. The opening 472 is closed by a translucent substrate 473 such as glass.
Such a guide member 47 surrounds and accommodates the solid light source 412 and the collimating lens (not shown) of the light source unit 41 and the elements 42 to 46 and is closed by the substrate 411 and the translucent substrate 473. It is configured as a closed enclosure.
In this embodiment, the guide member 47 is made of a metal such as magnesium die cast and has thermal conductivity (heat dissipation). Such a guide member 47 also functions as a heat radiating member that radiates heat from the light source unit 41 (substrate 411) and heat generated in the guide member 47. However, the present invention is not limited to this, and the guide member 47 may be formed of a material that is difficult to conduct heat.

[Configuration of cooling device]
FIG. 4 is a diagram showing the arrangement of the cooling device 5 in the exterior housing 2.
The cooling device 5 cools the light source device 4. More specifically, the cooling device 5 cools the substrate 411 of the light source unit 41. As shown in FIG. 4, the cooling device 5 includes a supply duct 51, a supply fan 52, an intermediate duct 53, a discharge duct 54, a discharge fan 55, a connection member 56, and a heat dissipation member 57.
In the following description, the direction from the back surface 24 to the front surface 23 of the exterior housing 2 is defined as + Z direction, and the directions intersecting with the + Z direction and intersecting with each other are defined as + Y direction and + X direction. The + Y direction is a direction from the bottom surface portion 22 toward the top surface portion 21, and the + X direction is a direction from the left side surface portion 25 toward the right side surface portion 26. The direction opposite to the + Z direction is taken as the −Z direction. The same applies to the −Y direction and the −X direction. In the present embodiment, the + X direction, the + Y direction, and the + Z direction are directions orthogonal to each other.

[Configuration of supply duct and supply fan]
The supply side duct 51 and the supply fan 52 constitute a supply system that supplies the cooling gas to the heat radiating member 57.
The supply-side duct 51 is a cylindrical duct that allows the cooling gas to flow through the heat dissipation member 57. One end of the supply side duct 51 is connected to the introduction port 251 of the exterior casing 2, and the other end is connected to the intermediate duct 53. More specifically, the supply-side duct 51 extends from the introduction port 251 on the + X direction side and the + Z direction side, and is connected to the intermediate duct 53. A supply fan 52 is disposed in the supply side duct 51.
The supply fan 52 is one of circulation devices, sucks air outside the exterior housing 2 as a cooling gas via the inlet 251, and sends the cooling gas to the heat radiating member 57 in the intermediate duct 53. Such a supply fan 52 can be constituted by an axial fan, for example.

[Configuration of intermediate duct]
The intermediate duct 53 is a cylindrical body formed in a substantially L shape with one side extending along the extending direction of the supply side duct 51 and the other side extending along the extending direction of the discharge side duct 54. The intermediate duct 53 has an end on the cooling gas inflow side connected to the supply side duct 51, and an end on the cooling gas outflow side connected to the discharge side duct 54. In such an intermediate duct 53, the heat radiating member 57 is arranged as described above. The configuration of the heat radiating member 57 will be described in detail later.

[Configuration of discharge duct and discharge fan]
The discharge side duct 54 and the discharge fan 55 constitute a discharge system that discharges the cooling gas that has cooled the heat dissipation member 57 to the outside.
The discharge side duct 54 is a cylindrical duct through which the cooling gas that has cooled the heat dissipation member 57 flows. The discharge duct 54 has one end connected to the intermediate duct 53 and the other end connected to the exhaust port 252. More specifically, the discharge side duct 54 extends from the intermediate duct 53 on the −X direction side and the + Z direction side, and is connected to the exhaust port 252. A discharge fan 55 is disposed in the discharge side duct 54.
The discharge fan 55 is one of the circulation devices, sucks the cooling gas that has cooled the heat radiating member 57, and discharges it to the exterior casing 2 (projector 1) through the exhaust port 252. Such an exhaust fan 55 can also be constituted by an axial fan, for example.

[Configuration of rectifying member provided at inlet and exhaust port]
In addition, louvers LV1 and LV2 as rectifying members for rectifying the cooling gas are provided in the introduction port 251 and the exhaust port 252.
The louver LV1 provided in the introduction port 251 is cooled so that the flow direction of the cooling gas passing through the introduction port 251 is along the supply side center line CL1 (see FIG. 5) which is the center line of the supply side duct 51. Rectify the gas.
The louver LV2 provided in the exhaust port 252 has a discharge side center line CL2 (the flow direction of the cooling gas discharged through the exhaust port 252 and discharged to the outside of the exterior housing 2 is the center line of the discharge side duct 54). The cooling gas is rectified so as to conform to FIG.
Thereby, the air separated from the exhaust port 252 is introduced into the introduction port 251 as a cooling gas, and the cooling gas is discharged from the exhaust port 252 in a direction away from the introduction port 251.

[Configuration of connecting members]
The connection member 56 is a heat transfer member that connects the object to be cooled and the heat radiating member 57 and transmits heat of the object to be cooled to the heat radiating member 57. In the present embodiment, the connection member 56 is formed by bending a metal plate such as aluminum having high thermal conductivity, and one end of the connection member 56 is a substrate 411 (on the opposite side to the mounting surface 411A) that is a cooling target. Surface 411B) and the other end is connected to the heat dissipation member 57. Note that the connection member 56 may be provided with a heat transport element such as a heat pipe or a vapor chamber.

[Configuration of heat dissipation member]
FIG. 5 is a schematic diagram showing the heat radiating member 57. In FIG. 5, the supply fan 52 and the exhaust fan 55 are not shown.
As described above, the heat dissipating member 57 is disposed in the intermediate duct 53 and releases the heat of the cooling target transmitted through the connecting member 56 into the circulating cooling gas. Cooling. As shown in FIG. 5, the heat radiating member 57 has a plurality of fins 571.
The plurality of fins 571 are a first plate-like portion 572 that is a portion on the cooling gas inflow side, and a second plate-like portion 573 that is a portion on the cooling gas outflow side and intersects the first plate-like portion 572. These are formed in a substantially L shape.
In addition, the inflow surface 57A (surface defined by the end portion of each fin 571 on the cooling gas inflow side) and the outflow surface 57B (defined by the end portion of each fin 571 on the outflow side of cooling gas). Plane) in the present embodiment is parallel to the XY plane. Here, the inflow surface 57A and the outflow surface 57B are parallel to the case where the inflow surface 57A and the outflow surface 57B are completely parallel to each other, and can be determined to be parallel to each other (substantially parallel). If it is a surface). That is, even if the inflow surface 57A and the outflow surface 57B are not parallel to each other, the inflow surface 57A and the outflow surface 57B are parallel to each other as long as the deviation is within a certain range. The same applies to the point where the inflow surface 57A and the outflow surface 57B are parallel to the XY plane.

  The first plate-like portion 572 is provided on each of the XY plane and the YZ plane so as to be along the supply side center line CL1 (in other words, the flow direction of the cooling gas flowing through the supply side duct 51) when viewed from the + Y direction side. It is the plate-shaped part which inclines with respect. The first plate-like portion 572 is inclined so as to intersect the normal line NLA of the inflow surface 57A counterclockwise at an intersection angle θ1 in the drawing view of FIG. That is, the crossing angle of the supply-side center line CL1 with respect to the normal line NLA coincides with the crossing angle of the first plate-like portion 572 with respect to the normal line NLA.

  The second plate-like portion 573 is disposed on each of the XY plane and the YZ plane so as to be along the discharge side center line CL2 (in other words, the flow direction of the cooling gas flowing through the discharge side duct 54) when viewed from the + Y direction side. It is the plate-shaped part which inclines with respect. The second plate-like portion 573 extends so as to incline so as to intersect the normal line NLB of the outflow surface 57B in the clockwise direction at the intersection angle θ2 in the drawing view of FIG. That is, the intersection angle of the discharge side center line CL2 with respect to the normal line NLB coincides with the intersection angle of the second plate-like portion 573 with respect to the normal line NLB. Note that the intersection angle of the discharge-side center line CL2 with respect to the normal line NLB and the intersection angle of the second plate-like portion 573 with respect to the normal line NLB are parallel, in addition to the case where these intersection angles are completely coincident with each other. This includes the case where it can be determined that (substantially matches). That is, if the difference between these crossing angles is within a predetermined angle, these crossing angles are assumed to match.

Here, since the inflow surface 57A and the outflow surface 57B are parallel surfaces as described above, the normal line NLA and the normal line NLB are parallel to each other.
In the present embodiment, the intersection angle θ1 of the supply-side center line CL1 with respect to the normal line NLA coincides with the intersection angle θ2 of the discharge-side center line CL2 with respect to the normal line NLB. In addition, although there is a difference between counterclockwise and clockwise, the supply-side center line CL1 and the discharge-side center line CL2 extend from the normal lines NLA and NLB to the same side (−X direction side). That is, the supply-side center line CL1 and the discharge-side center line CL2 intersect at an angle of less than 180 °, and the supply-side duct 51 and the discharge-side duct 54 are the same on the basis of the inflow surface 57A and the outflow surface 57B. Inclined and extends in the X direction.
In addition, the dimension of the 1st plate-shaped part 572 in the direction along the said normal line NLA corresponds with the dimension of the 2nd plate-shaped part 573 in the same direction.

[Flow of cooling gas flowing through cooling device]
In such a cooling device 5, the cooling gas introduced from the introduction port 251 into the supply side duct 51 by the supply fan 52 circulates toward the heat radiating member 57 in the intermediate duct 53, and each fin 571 from the inflow surface 57 </ b> A. The first plate-like portion 572 flows in between. The cooling gas flows along the first plate-like portion 572 and the second plate-like portion 573 and is discharged from the outflow surface 57B. In this process, the cooling gas cools the fins 571 (in other words, heat exchange with the fins 571) to cool the heat dissipation member 57. Thereby, the heat of the cooling target (substrate 411) connected to the heat dissipation member 57 and the connection member 56 is cooled, and the cooling target is cooled.
Then, the cooling gas flowing out from the outflow surface 57 </ b> B is sucked by the discharge fan 55, circulates through the discharge side duct 54, and is discharged from the exhaust port 252 to the outside of the exterior housing 2.

[Relationship between crossing angle of duct and cooling efficiency]
Here, when the dimension between the inflow surface 57A and the outflow surface 57B in the + Z direction is constant, the fins 571 (the first plate-like portion 572 and the second plate-like shape) increase as the crossing angles θ1 and θ2 increase. The portion 573) can be formed long, and the surface area of each fin 571 can be increased. In this case, the heat radiation efficiency by the fins 571 and by the heat radiation member 57 is improved.
On the other hand, when the intersection angles θ1 and θ2 increase, the flow resistance between the fins 571 increases, and the cooling gas does not easily flow between the fins 571. In this case, the heat dissipation efficiency by each fin 571 falls.
For this reason, the crossing angles θ1 and θ2 need to be set to appropriate angles.

On the other hand, the present inventors verified the heat radiation efficiency by the heat radiation member 57 by changing the intersection angles θ1 and θ2 of the supply side center line CL1 and the discharge side center line CL2 with respect to the normal lines NLA and NLB.
As described above, since the intersection angles θ1 and θ2 have the same value, the intersection angles θ1 and θ2 are set as an angle θ. In the verification test, the angles θ are 0 °, 30 °, 45 °, The angles were 60 ° and 75 °. Among these, the case where the angle θ is 0 ° indicates that the supply-side center line CL1 and the discharge-side center line CL2 are along the normal lines NLA and NLB, respectively.

In this verification test, the material of the heat radiation member 57 to be used was copper, and among the dimensions of the fins 571, the dimension LZ in the + Z direction was 60 mm, and the dimension in the + Y direction was 60 mm. Note that the dimension LX in the + X direction depends on the angle θ as described above. The number of fins 571 was 24, and the distance between the fins 571 was 2 mm.
Further, it is assumed that the surface of each fin 571 generates heat uniformly at 200 W, and the supply fan 52 disposed in the supply side duct 51 blows cooling gas at a constant flow rate. In this verification test, the exhaust fan 55 is not provided.
In addition to these, the environmental temperature at which the cooling device 5 is disposed was 20 °.
The test results of the verification test are shown in Table 1 below.

FIGS. 6 to 9 are graphs showing the test results, and graphs showing the dimension LX of the fin 571, the surface area of the heat radiating member 57, the heat transfer coefficient, and the thermal resistance according to the angle θ. It is.
Among these, as shown in Table 1, FIG. 6, and FIG. 7, the dimension LX and the surface area of the heat radiating member 57 increase as the angle θ increases. These dimensions LX and the surface area are significantly increased when the angle θ exceeds 60 °.
On the other hand, when the angle θ is increased, the flow of the cooling gas flowing along the first plate-like portion 572 becomes sharper when the cooling gas flows along the second plate-like portion 573, and the flow passage Since it becomes longer, the pressure loss of the cooling gas increases and the air volume decreases. For this reason, as shown in Table 1 and FIG. 8, the heat transfer coefficient (average heat transfer coefficient) of the heat radiating member 57 decreases as the angle θ increases.
Further, the thermal resistance of the heat radiating member 57 is expressed by the following formula (1). From this, as shown in Table 1 and FIG. 9, it decreases as the angle θ increases. However, the decrease in thermal resistance does not decrease so much as the angle θ increases.

[Equation 1]
Thermal resistance = 1 / (heat transfer coefficient x surface area) (1)

Based on the above, the flow direction of the cooling gas to the heat radiating member 57 (the flow direction of the cooling gas in the supply side duct 51) and the flow direction of the cooling gas from the heat radiating member 57 (the cooling gas in the discharge side duct 54). In order to reduce the thermal resistance and further reduce the size of the entire cooling device 5, the angle θ (intersection angles θ1, θ2) is 30 ° or more and 60 ° or less. It is preferable that
In other words, the supply-side center line CL1 and the discharge-side center line CL2 are set with respect to the normal lines NLA and NLB so that the angle θ (intersection angles θ1, θ2) is 30 ° or more and 60 ° or less. Then, the supply-side duct 51 and the discharge-side duct 54 are disposed, and the first plate-like portion 572 and the second plate-like portion 573 of each fin 571 are formed in accordance with the center lines CL1 and CL2. As a result, the cooling gas discharged from the discharge side duct 54 via the exhaust port 252 can be prevented from flowing again into the supply side duct 51 via the introduction port 251, and the cooling device 5 can be downsized. Furthermore, the cooling efficiency of the object to be cooled can be improved.

[Effect of the embodiment]
According to the cooling device 5 and the projector 1 according to the present embodiment described above, the following effects can be obtained.
Since the cooling device 5 has the supply side duct 51 and the discharge side duct 54, the cooling gas can be smoothly circulated to the heat radiating member 57, and the cooling gas that has cooled the heat radiating member 57 can be cooled without stagnation. It can be discharged outside the device 5.
Further, the supply side center line CL1 and the discharge side center line CL2 (specifically, the extended lines of the supply side center line CL1 and the discharge side center line CL2) intersect at an angle of less than 180 °. From this, when the supply side center line CL1 and the discharge side center line CL2 are parallel to each other, the flow length of the supply side duct 51 is the same, and the flow length of the cooling gas in the discharge side duct 54 is the same. Even in this case, it is possible to reduce the dimension (the dimension in the + Z direction) between the end portions of the supply side duct 51 and the discharge side duct 54 that are separated from each other. That is, the dimension between the end portion on the −Z direction side of the supply side duct 51 and the end portion on the + Z direction side of the discharge side duct 54 can be reduced. For this reason, the cooling device 5 can be reduced in size.
Then, the cooling gas in a part away from the discharge side duct 54 is introduced into the supply side duct 51, and the cooling gas is discharged from the discharge side duct 54 in a direction away from the supply side duct 51. According to this, it is possible to suppress the cooling gas discharged from the discharge side duct 54 from flowing into the supply side duct 51.
Therefore, the cooling device 5 can be reduced in size while suppressing a decrease in performance of the cooling device 5 due to re-introduction of the discharged cooling gas. Thereby, the arrangement space of the cooling device 5 in the projector 1 can be reduced, and the projector 1 can be miniaturized.

  Each of the plurality of fins 571 included in the heat dissipation member 57 includes a first plate-like portion 572 along the supply-side center line CL1 and a second plate-like portion 573 along the discharge-side center line CL2, as viewed from the + Y direction side. Have According to this, compared with the case where the heat dissipation member 57 has a plurality of linear fins orthogonal to either the inflow surface 57A or the outflow surface 57B, the surface area of the fins 571 and by extension, the heat dissipation member 57 is increased. Can do. In addition, the cooling gas can be easily introduced between the fins 571. Therefore, the heat dissipation performance of the heat dissipation member 57 can be improved.

  The crossing angle θ1 of the supply side center line CL1 with respect to the normal line NLA of the inflow surface 57A is 30 ° or more and 60 ° or less, and the crossing angle θ2 of the discharge side center line CL2 with respect to the normal line NLB of the outflow surface 57B is 30 °. Above, it is 60 degrees or less. According to this, the cooling gas discharged from the discharge side duct 54 can be prevented from flowing into the supply side duct 51 again as described above. Therefore, the performance of the cooling device 5 can be suppressed, and the cooling device 5 can be downsized.

  The inflow surface 57A and the outflow surface 57B are parallel to each other, and the intersection angle θ1 of the supply side center line CL1 with the normal line NLA of the inflow surface 57A and the intersection of the discharge side center line CL2 with the normal line NLB of the outflow surface 57B. The angle θ2 matches. According to this, the plurality of fins 571 each having the first plate-like portion 572 and the second plate-like portion 573 are compared with the case where the crossing angles θ1 and θ2 are different from each other (when they do not coincide with each other). It can be formed relatively easily.

  The cooling device 5 cools the light source device 4, specifically, the substrate 411 (and thus the solid light source 412) as a cooling target. According to this, since the substrate 411 having a relatively high temperature can be cooled in the configuration of the projector 1, light can be stably emitted, and image formation and projection can be stably performed.

  The exterior housing 2 constituting the exterior is provided with an introduction port 251 for introducing cooling gas outside the exterior housing 2 into the interior and an exhaust port 252 for exhausting cooling gas inside the exterior housing 2 to the outside. It has a left side surface portion 25. Among these, the introduction port 251 is connected to the end of the supply side duct 51 opposite to the heat dissipation member 57, and the exhaust port 252 is connected to the end of the discharge side duct 54 opposite to the heat dissipation member 57. Is done. According to this, since the introduction port 251 to which the supply side duct 51 is connected and the exhaust port 252 to which the discharge side duct 54 is connected are located on one side surface of the exterior housing 2, the introduction port 251. In addition, the exhaust port 252 can be made inconspicuous. Therefore, the appearance of the projector 1 can be improved.

  The exterior housing 2 has the surface portions 21 to 26. Among these, the front part 23 (first surface part) is located in the image projection direction, and the back part 24 (second surface part) is located on the opposite side to the front part 23. The bottom surface portion 22 (third surface portion) faces the installation surface on which the projector is installed, and the top surface portion 21 (fourth surface portion) is located on the opposite side to the bottom surface portion 22. Further, the left side surface portion 25 (one of the fifth surface portion and the sixth surface portion) connects these surface portions 21 to 24 on the −X direction side, and the right side surface portion 26 (the other of the fifth surface portion and the sixth surface portion) is the surface portion. 21 to 24 are connected on the + X direction side. The introduction port 251 and the exhaust port 252 are located on the left side surface portion 25. According to this, the cooling gas can be discharged from the exhaust port 252 in a direction different from the + Z direction that is the image projection direction by the projector 1 (projection optical device 35). Therefore, it is possible to suppress the distortion of the projected image due to the so-called positive flame and to suppress the deterioration of the image.

  The introduction port 251 and the exhaust port 252 are provided with louvers LV1 and LV2 as rectifying members that rectify the cooling gas flowing through them. According to this, directivity can be given to the flow direction of the cooling gas flowing through the introduction port 251 and the exhaust port 252. For this reason, the cooling gas at a position away from the exhaust port 252 can be easily circulated through the introduction port 251, and the cooling gas can be easily discharged from the exhaust port 252 in a direction away from the introduction port 251. Therefore, it is possible to prevent the cooling gas discharged from the exhaust port 252 from being reintroduced into the exterior casing 2 through the introduction port 251.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, 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 the above embodiment, the cooling device 5 has the supply fan 52 disposed in the supply side duct 51 and the discharge fan 55 disposed in the discharge side duct 54 as a distribution device. However, the present invention is not limited to this, and the cooling device 5 may include at least one of the supply fan 52 and the exhaust fan 55. The fans 52 and 55 do not have to be axial fans, but may be centrifugal fans (sirocco fans).

  In the above embodiment, the heat dissipation member 57 has a plurality of fins 571, and each of the plurality of fins 571 and the first plate-like portion 572 along the supply-side center line CL1 when viewed from the + Y direction side, and the discharge And a second plate-like portion 573 along the side center line CL2. However, the present invention is not limited to this, and the shape of the fins 571 can be changed as appropriate, and the fins 571 may extend, for example, in a straight line along the + Z direction. Moreover, the 1st plate-shaped part 572 should just follow the supply side center line CL1 seeing from + Y direction side, and does not need to be along the said supply side center line CL1 completely. The same applies to the second plate-like portion 573. Furthermore, the first plate-like portion 572 and the second plate-like portion 573 may be separated.

In the above embodiment, the crossing angle of the supply side center line CL1 with respect to the normal line NLA of the inflow surface 57A is 30 ° or more and 60 ° or less, and the crossing angle of the discharge side center line CL2 with respect to the normal line NLB of the outflow surface 57B is 30 ° or more and 60 ° or less. However, the present invention is not limited to this, and the intersection angle of the center lines CL1 and CL2 with respect to the respective normal lines NLA and NLB may be less than 30 ° or may exceed 60 °.
Furthermore, the crossing angle θ1 of the supply-side center line CL1 with respect to the normal line NLA and the crossing angle θ2 of the discharge-side center line CL2 with respect to the normal line NLB may not coincide with each other, and the inflow surface 57A and the outflow surface 57B The planes may not be parallel to each other, and these may not be planes parallel to the XY plane.

  In the above embodiment, the substrate 411 constituting the light source unit 41 of the light source device 4 is the cooling target of the cooling device 5. However, the configuration is not limited to this, and the cooling target may have another configuration. For example, the connection member 56 may be connected to the light modulation device 343, the polarization conversion element 314, or the wavelength conversion element 45, and the heat dissipation member 57 connected to the connection member 56 may dissipate the transmitted heat. Good. Furthermore, the heat radiating member 57 may be in direct contact with the object to be cooled. In this case, the connecting member 56 can be omitted.

  In the above embodiment, the introduction port 251 and the exhaust port 252 of the exterior housing 2 are located on the left side surface portion 25. However, the present invention is not limited to this, and the introduction port and the exhaust port may be located on other surface portions such as the right side surface portion 26. Further, for example, the introduction port is located on the left side surface portion 25 and the exhaust port is located on the front surface portion 23, and the introduction port is located on one of the two adjacent surface portions, and the exhaust port is located on the other side. Good. That is, the layout of the cooling device 5 in the projector 1 can be changed as appropriate according to the position of the cooling target and the positions of the introduction port and the exhaust port.

  In the embodiment described above, the introduction port 251 and the exhaust port 252 are provided with the louvers LV1 and LV2 as rectifying members. However, the present invention is not limited to this, and a louver may be provided only in one of the introduction port 251 and the exhaust port 252, and such a louver may not be provided. Furthermore, instead of the louver, a rectifying member having another configuration may be provided.

  In the above embodiment, the cooling device 5 has the intermediate duct 53 in which the heat radiating member 57 is disposed and the supply side duct 51 and the discharge side duct 54 are connected to each other. However, the present invention is not limited to this, and the intermediate duct 53 may be omitted. In this case, the supply side duct 51 and the discharge side duct 54 may be connected to each other, one end of the supply side duct 51 is connected to the inflow surface 57A, and one end of the discharge side duct 54 is connected to the outflow surface 57B. May be.

In the above embodiment, the projector 1 includes the three light modulation devices 343 (343R, 343G, and 343B). 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 the above-described embodiment, the image projection device 3 is configured to have the substantially L shape illustrated in FIG. However, the present invention is not limited to this, and the layout and configuration of the image projection apparatus 3 such as a substantially U shape can be changed as appropriate, and the optical components employed can be changed as appropriate.

  In the above embodiment, the light modulation device 343 having a transmissive liquid crystal panel having a different light incident surface and light emitting surface 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 the above embodiment, the front part 23 has the opening 231 from which a part of the projection optical device 35 is exposed. In other words, the image projected from the projection optical device 35 is projected from the front part 23 onto the projection surface. However, the present invention is not limited to this, and the opening through which the projected image passes may be located on the top surface 21. Even in this case, the front portion is a surface portion located in the image projection direction.

  In the above embodiment, an example in which the cooling device 5 is applied to the projector 1 has been described. However, the present invention is not limited to this, and the cooling device of the present invention can also be applied to other electronic devices. Moreover, in the said embodiment, although the one cooling device 5 was applied to the projector 1, when there exist multiple light source devices 4, for example, you may employ | adopt the some cooling device 5 according to several cooling object.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior housing | casing, 21 ... Top surface part (4th surface part), 22 ... Bottom surface part (3rd surface part), 23 ... Front part (1st surface part), 231 ... Opening part, 24 ... Back surface part ( 2nd surface portion), 25... Left side surface portion (one side surface of the 5th surface portion and 6th surface portion), 251... Inlet port, 252. (343R, 343G, 343B) ... light modulation device, 35 ... projection optical device, 4 ... light source device, 411 ... substrate (cooling target), 412 ... solid light source (light source), 5 ... cooling device, 51 ... supply side duct, 52 ... Supply fan (distribution device), 53 ... Intermediate duct, 54 ... Discharge-side duct, 55 ... Discharge fan (distribution device), 56 ... Connection member, 57 ... Radiation member, 57A ... Inflow surface, 57B ... Outflow surface, 571 ... Fin, 572 ... First plate-like part, 573 ... Second Jo unit, CL1 ... supply-side center line, CL2 ... discharge side centerline, NLA ... normals (normals of the inlet surface), NLB ... normals (normals of the outflow surface).

Claims (10)

A heat dissipating member that dissipates heat transferred from the object to be cooled;
A supply duct for supplying cooling gas to the heat radiating member;
A discharge-side duct from which the cooling gas that has cooled the heat dissipation member is discharged;
A circulation device for circulating the cooling gas to the heat radiating member through the supply duct,
The heat dissipation member has a plurality of fins through which the cooling gas flows,
The supply-side center line that is the center line of the supply-side duct is inclined with respect to the normal line of the inflow surface defined by the cooling gas inflow end portions of the plurality of fins,
The discharge-side center line that is the center line of the discharge-side duct is inclined with respect to the normal line of the outflow surface defined by the cooling gas outflow side ends of the plurality of fins,
The cooling apparatus, wherein the supply side center line and the discharge side center line intersect at an angle of less than 180 °. The cooling device according to claim 1, wherein
Each of the plurality of fins is
A first plate-like portion along the supply-side center line;
And a second plate-like portion along the discharge-side center line. The cooling device according to claim 1 or 2,
The crossing angle of the supply side center line with respect to the normal of the inflow surface is 30 ° or more and 60 ° or less,
The crossing angle of the discharge side center line with respect to the normal line of the outflow surface is not less than 30 ° and not more than 60 °. In the cooling device according to any one of claims 1 to 3,
The inflow surface and the outflow surface are parallel to each other;
The cooling device according to claim 1, wherein an intersection angle of the supply side center line with respect to a normal line of the inflow surface and an intersection angle of the discharge side center line with respect to a normal line of the outflow surface coincide. A projector for projecting an image,
A projector comprising the cooling device according to any one of claims 1 to 4. The projector according to claim 5, wherein
A light source device;
A light modulation device for modulating the light emitted from the light source device to form the image;
A projection optical device that projects the image formed by the light modulation device,
A component of the light source device is the cooling target. The projector according to claim 6,
The light source device has a substrate on which a light source is mounted,
The substrate is the cooling target,
The projector is characterized in that heat of the substrate is transmitted to the heat dissipation member. The projector according to any one of claims 5 to 7,
Provided with an exterior casing constituting the exterior,
The exterior housing has a side surface on which an introduction port for introducing the cooling gas outside the exterior housing and an exhaust port for discharging the cooling gas inside the exterior housing to the outside are located.
The introduction port is connected to an end of the supply side duct opposite to the heat dissipation member,
The projector is characterized in that the exhaust port is connected to an end of the discharge side duct opposite to the heat dissipation member. The projector according to claim 8, wherein
The outer casing is
A first surface portion located in the projection direction of the image;
A second surface portion located on the opposite side of the first surface portion;
A third surface portion facing an installation surface on which the projector is installed;
A fourth surface portion located on the opposite side of the third surface portion;
A fifth surface portion connecting the first surface portion, the second surface portion, the third surface portion and the fourth surface portion on one end side;
A sixth surface portion connecting the first surface portion, the second surface portion, the third surface portion, and the fourth surface portion on the other end side;
The projector is characterized in that the side surface is one of the fifth surface portion and the sixth surface portion. The projector according to claim 8 or 9,
A projector comprising a rectifying member that is provided in at least one of the introduction port and the exhaust port and rectifies the cooling gas flowing through the opening.

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