JP2012185387A - Cooling unit, cooler, and projection type video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling unit which guarantees sufficient cooling performance even with a small-sized housing structure; a cooler; and a projection type video display device.SOLUTION: A cooling unit includes an intake port 212A which takes in cooling air from the outside and an exhaust port 213A which discharges the cooling air to the outside, in which an air channel connecting the intake port 212A to the exhaust port 213A makes a folded shape and a forward path from the intake port 212A and a return path to the exhaust port 213A are adjacent to each other.

Description

  The present invention relates to a cooling unit having a radiation fin, a cooling device, and a projection display apparatus.

2. Description of the Related Art Conventionally, a projection display apparatus having a projection optical system that projects light emitted from an illumination optical system onto a projection surface is known. The illumination optical system includes, for example, a light source such as an LED (Light Emitting Diode) and a light modulation element that modulates light emitted from the light source. The projection optical system includes, for example, a projection lens for projecting modulated light from the illumination optical system onto a screen. The projection display apparatus has a cooling unit such as a heat sink that cools a heat source such as a light source. (For example, Patent Document 1)
In the example of Patent Document 1, the heat sink is arranged near each of the red, green, and blue light sources, and each light source is arranged in three specific directions of the cross shape with the light combining unit as the center. The cooling air sucked from the intake port takes heat from heat sources such as each light source by cooling each heat sink. Therefore, the cooling air sucked from the air intake port cools the plurality of heat sinks while circulating the entire outer periphery in the projection display apparatus, and is exhausted from the air exhaust port located at a position away from the air intake port.

JP 2005-257873 A

  However, in the above example, the cooling air sucked from the air inlet cools the plurality of heat sinks while circulating the entire outer periphery in the projection display apparatus. In such a configuration, it is necessary to circulate the flow path through which the cooling air moves around the entire projection display apparatus, which increases the size of the projection display apparatus. Therefore, it becomes a big problem when manufacturing a small housing structure. Therefore, the present invention has been made to solve the above-described problems, and provides a cooling unit, a cooling device, and a projection display apparatus that ensure sufficient cooling performance even with a small housing structure. For the purpose.

  The cooling unit according to the first feature (second cooling unit 720) includes an intake port (intake port 212A) for sucking cooling air from the outside, and an exhaust port (exhaust port 213A) for discharging the cooling air to the outside. A cooling unit (second cooling unit 720). An air flow path connecting the intake port (intake port 212A) and the exhaust port (exhaust port 213A) has a folded shape, and the forward path from the intake port (intake port 212A) and the exhaust port (exhaust port 213A). The return paths are adjacent to each other.

In the first feature, at least one heat dissipating member (heat dissipating fin 430) is disposed on each of the forward path and the return path.
In the first feature, the air flow path from the intake port (intake port 212A) to the exhaust port (exhaust port 213A) and the heat radiation member (heat radiation fin 430) are covered with a duct (duct 312A). It is characterized by being.

  1st characteristic WHEREIN: It is a cooling device (cooling device 700) provided with the other cooling unit (1st cooling unit 710) different from the said cooling unit (2nd cooling unit 720). The direction of the exhaust port (exhaust port 213A) of the cooling unit (second cooling unit 720) and the direction of the exhaust port (exhaust port 213B) of the other cooling unit (first cooling unit 710) are the same direction. Features.

In the first feature, the cooling unit (second cooling unit 720) is arranged in the cooling fan (fan 311A) for intake or exhaust of cooling air, and the other cooling unit (first cooling unit 710). And another cooling fan (fan 311B) for intake and exhaust of the cooling air. The cooling fan (fan 311A) and the other cooling fan (fan 311B) are provided at diagonal positions, respectively.
The projection display apparatus according to the second feature includes the cooling unit (second cooling unit 720) or the cooling device (700) according to the first feature.

  It is possible to provide a cooling unit, a cooling device, and a projection display apparatus that ensure sufficient cooling performance even with a small casing structure.

1 is a side view of a projection display apparatus 100 (floor projection) according to a first embodiment. 1 is a side view of a projection display apparatus 100 (wall surface projection) according to a first embodiment. 1 is a front view of a projection display apparatus 100 according to a first embodiment. It is the perspective view which looked at the front from the slanting upper part of the projection type video display apparatus 100 concerning 1st Embodiment. It is the perspective view which looked at the lower surface from the slanting lower part of the projection type video display apparatus 100 concerning 1st Embodiment. It is a figure which shows the detail of the cooling part 400G which concerns on 1st Embodiment, and the cooling part 400B. It is a figure which shows the detail of the cooling device 700 which concerns on 1st Embodiment. It is a figure which shows the detail of the projection unit 50 which concerns on 1st Embodiment. It is a figure which shows the detail of the 2nd cooling unit 720 which concerns on 1st Embodiment.

  Hereinafter, a projection display apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[Outline of Embodiment]
The cooling unit according to the embodiment includes an intake port for sucking cooling air from the outside and an exhaust port for discharging cooling air to the outside. The air flow path connecting the intake port and the exhaust port has a folded shape, and is provided so that the forward path from the intake port and the return path to the exhaust port are adjacent to each other.

  In the embodiment, the air flow path connecting the intake port and the exhaust port has a folded shape, and the forward path from the intake port and the return path to the exhaust port are provided adjacent to each other. Therefore, the area where the air flow path is installed can be reduced, and the entire cooling unit can be reduced in size while ensuring cooling performance.

[First Embodiment]
(Outline of projection display device)
Hereinafter, an outline of the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 1 is a side view of a projection display apparatus 100 (floor projection) according to the first embodiment. FIG. 2 is a side view of the projection display apparatus 100 (wall surface projection) according to the first embodiment. FIG. 3 is a front view of the projection display apparatus 100 according to the first embodiment.

  Here, referring to FIG. 1, the upper surface is the upper surface, the lower surface (installation surface) is the lower surface, the right surface is the front surface, and the left surface is the left surface. A surface disposed on the back side and the near side is defined as a left side surface, and a surface disposed on the back side is defined as a right side surface.

  As shown in FIGS. 1 and 2, the projection display apparatus 100 has a housing 200 and projects an image on a projection surface. The projection surface may be provided on the floor surface as shown in FIG. 1, or may be provided on the wall surface as shown in FIG.

  Note that the housing 200 is provided with a transmission region 211 that transmits video light. The image light projected from the projection display apparatus 100 is once condensed in the vicinity of the transmission region 211 and then enlarged and projected toward the projection surface (see the arrows passing through the transmission region 211 in FIGS. 1 and 2). . The housing 200 is provided with an intake port 212 (intake port 212A and intake port 212B) and an exhaust port 213 (exhaust port 213A and exhaust port 213B).

  As shown in FIGS. 1 to 3, the air inlet 212 </ b> A is provided on the lower surface on the left side surface of the housing 200 and in the vicinity of the front surface. The air inlet 212 </ b> B is provided near the upper surface and the back surface on the right side surface of the housing 200. The exhaust port 213 </ b> A is provided near the lower surface and the rear surface on the left side surface of the housing 200. The exhaust port 213 </ b> B is provided on the lower surface on the left side surface of the housing 200 and in the vicinity of the front surface.

  Therefore, the exhaust port 213 (the exhaust port 213A and the exhaust port 213B) is provided on the left side surface of the housing 200, and the exhaust ports are oriented in the same direction.

(Details of projection display device)
Details of the projection display apparatus according to the first embodiment will be described below with reference to the drawings. 4 and 5 are diagrams showing details of the projection display apparatus 100. FIG. FIG. 4 is a perspective view of the projection display apparatus 100 as seen from the front side obliquely from above. FIG. 5 is a perspective view of the lower surface of the projection display apparatus 100 as viewed from obliquely below. 4 and 5 show the internal configuration of the projection display apparatus 100. FIG.

  4 and 5, the projection display apparatus 100 includes a light source 10 (light source 10R, light source 10G, and light source 10B), a cross dichroic mirror 20, a folding mirror 30, and a DMD (Digital Micromirror Device). 40 and a projection unit 50.

  The light source 10R is a light source that emits red component light R, and is, for example, a red LED (Light Emitting Diode) or a red LD (Laser Diode). The light source 10G is a light source that emits green component light G, and is, for example, a green LED or a green LD. The light source 10B is a light source that emits blue component light B, and is, for example, a blue LED or a blue LD.

  The cross dichroic mirror 20 transmits the green component light G emitted from the light source 10G, reflects the blue component light B and the red component light R emitted from the light source 10B and the light source 10R, and transmits the red component light R to the folding mirror 30. , Green component light G and blue component light B are guided.

  The cross dichroic mirror 20 transmits the green component light G emitted from the light source 10G, reflects the blue component light B and the red component light R emitted from the light source 10B and the light source 10R, and transmits the red component light R to the folding mirror 30. , Green component light G and blue component light B are guided. The cross dichroic mirror 20 is attached to the dichroic mirror that reflects the light source 10B by shifting the dichroic mirror that reflects the light source 10R without being mounted on a straight line. This can improve the light transmittance of the light source 10G at the joint surface to which each dichroic mirror is joined, as compared to a dichroic mirror attached in a straight line in a cross shape.

  The folding mirror 30 reflects the red component light R, the green component light G, and the blue component light B emitted from the cross dichroic mirror 20 to the DMD 40 side.

  The DMD 40 is composed of a plurality of minute mirrors, and the plurality of minute mirrors are movable. The DMD 40 switches whether to reflect the light reflected by the folding mirror 30 to the projection unit 50 by changing the angle of each micromirror.

  Here, it should be noted that the center of the DMD 40 is shifted from the optical axis of the projection unit 50 as shown in FIG.

  The projection unit 50 projects the image light emitted from the DMD 40 onto the projection surface. For example, the projection unit 50 includes a projection lens group 51 and a reflection mirror 52.

  The projection lens group 51 emits image light emitted from the DMD 40 to the reflection mirror 52 side. The projection lens group 51 includes a circular lens centered on the optical axis of the projection unit 50.

  It should be noted that the diameter of the lens included in the projection unit 50 is larger as it is closer to the reflection mirror 52. It should be noted that the reflection mirror 52 is larger than the diameter of the lens included in the projection unit 50.

  The reflection mirror 52 reflects the image light emitted from the projection lens group 51 to the projection surface side. The reflection mirror 52 is an aspherical mirror having a concave surface on the DMD 40 side, for example.

  The projection display apparatus 100 includes a fan 311 (fan 311A and fan 311B, and duct 312 (duct 312A and duct 312B).

  The fan 311 generates an air flow from the intake port 212 to the exhaust port 213 in the air flow path formed by the duct 312. Specifically, the fan 311A is a fan that guides air outside the housing 200 from the air inlet 212A to the inside of the duct 312A as cooling air. The fan 311B is a fan that guides air outside the housing 200 from the air inlet 212B to the inside of the duct 312B as cooling air. The fan 311A is provided near the lower surface and the front surface on the left side surface of the housing 200, and the fan 311B is provided near the upper surface and the back surface on the right surface of the housing 200 (see FIG. 4). Accordingly, the fan 311A and the fan 311B are provided at diagonal positions.

  The duct 312 forms an air flow path from the intake port 212 to the exhaust port 213. Specifically, the duct 312A forms part of the air flow path from the intake port 212A to the exhaust port 213A. Further, the duct 312B forms the entire air flow path from the intake port 212B to the exhaust port 213B. The duct 312A forms part of the air flow path, but may form the entire air flow path. Further, the duct 312A has an air flow path by a duct 312A that forms a part of the air flow without forming the entire air flow path as a duct, an inner wall of the housing 200, and a partition wall 610 (see FIG. 9) described later. You may fulfill the duct function which covers the whole. Moreover, although the duct 312B forms the whole air flow path, you may form a part of air flow path.

  The projection display apparatus 100 includes a cooling unit 400 (cooling unit 400R, cooling unit 400G, cooling unit 400B, cooling unit 400X, cooling unit 400Y).

  The cooling unit 400R cools the light source 10R. In the first embodiment, the cooling unit 400R is a heat radiating fin 430R.

  The cooling unit 400G cools the light source 10G. The cooling unit 400G includes a heat receiving unit 410G, a heat pipe 420G, and a radiation fin 430G.

  The cooling unit 400B cools the light source 10B. Cooling unit 400B includes heat receiving unit 410B, heat pipe 420B, and heat radiation fin 430B.

  The cooling unit 400X cools the DMD 40. In the first embodiment, the cooling unit 400X is a heat radiating fin 430X.

  The cooling unit 400Y cools the driver board 500 (see FIG. 5) that drives the light source 10. In the first embodiment, the cooling unit 400Y is a heat radiating fin 430Y.

  FIG. 6 is a diagram illustrating details of the cooling unit 400G and the cooling unit 400B according to the first embodiment.

  As illustrated in FIG. 6, the cooling unit 400G and the cooling unit 400B include a heat receiving unit 410G and a heat receiving unit 410B, a heat pipe 420G and a heat pipe 420B, and heat radiating fins 430G and heat radiating fins 430B.

  The heat receiving unit 410G and the heat receiving unit 410B receive heat using the light source 10B and the light source 10G as heat sources. The heat pipe 420G and the heat pipe 420B transfer heat to the radiation fins 430G and the radiation fins 430B. The radiating fins 430G and the radiating fins 430B are arranged on the air flow path of the cooling air.

  That is, the heat receiving part 410G receives the heat of the light source 10G, and the heat pipe 420G transmits the heat of the light source 10G to the heat radiation fin 430G. Similarly, the heat receiving part 410B receives the heat of the light source 10B, and the heat pipe 420B transmits the heat of the light source 10B to the heat radiation fin 430B.

  Details of the cooling unit 400G, the cooling unit 400B, the duct 312B, and the fan 311B (hereinafter referred to as the first cooling unit 710 in the above assembly) will be described later with reference to FIGS. Details of the cooling unit 400R, the cooling unit 400X, the cooling unit 400Y, the duct 312A, and the fan 311A (hereinafter referred to as the second cooling unit 720 in the above assembly) will be described later with reference to FIG.

(Details of the first cooling unit)
Details of the first cooling unit 710 according to the first embodiment will be described below with reference to the drawings.

  FIG. 7 is a diagram showing details of a first cooling unit 710 including a fan 311B and a duct 312B in addition to the cooling unit 400G and the cooling unit 400B shown in FIG. 6 and a second cooling unit 720 described later. In the first embodiment, the first cooling unit 710 and the second cooling unit 720 are collectively referred to as a cooling device 700.

  The fan 311B is a sirocco fan. The fan 311B guides cooling air from the air inlet 212B of the housing 200 to the inside of the housing 200. A duct 312B is connected to the outlet of the fan 311B.

  The duct 312B is an air flow path that guides the cooling air guided from the fan 311B to the cooling unit 400G and the cooling unit 400B. A projection unit 50 is provided between the fan 311B, the cooling unit 400G, and the cooling unit 400B (see FIG. 4). The diameter of the lens included in the projection lens group 51 is larger as it is closer to the reflection mirror 52. The reflection mirror 52 is provided on the back side of the housing 200 with respect to the projection lens group 51. Therefore, as shown in FIG. 8, the gap portion 600 is generated due to the difference in position where the reflection mirror 52 and the projection lens group 51 are provided. That is, in the gap portion 600, the optical axis passing through the center of the DMD 40 is shifted with respect to the optical axis passing through the center of the projection lens group 51, so that the light emitted from the projection lens group 51 is tilted. The reflection mirror 52 is shifted with respect to the optical axis of the projection lens depending on the amount, and a gap 600 is generated between the projection unit 50 and the housing 200. The duct 312B is formed so as to pass through the gap portion 600, and forms an air flow path for guiding the cooling air to the radiation fins 430G and the radiation fins 430B.

  The fan 311B is disposed in the vicinity of the intake port 212B and functions as an intake fan, but is not limited thereto. For example, it is arranged near the exhaust port 213B and may act as an exhaust fan. If it is an exhaust fan, an axial fan may be used instead of a sirocco fan.

(Details of the second cooling unit)
Details of the second cooling unit 720 according to the first embodiment will be described below with reference to the drawings. FIG. 9 is a diagram illustrating details of the second cooling unit 720 including the cooling unit 400R, the cooling unit 400X, the cooling unit 400Y, and the duct 312A according to the first embodiment.

  The fan 311A is an axial fan. The fan 311A guides cooling air from the air inlet 212A of the housing 200 to the inside of the housing 200. Radiating fins 430R are provided at the outlet of the fan 311A.

  The radiation fins 430R radiate the heat of the light source 10R by the cooling air guided from the fan 311A. The cooling air used for heat radiation is guided to the heat radiation fin 430X provided at the outlet of the heat radiation fin 430R. The heat radiating fins 430R are provided with a plurality of heat radiating fins so as to be parallel to the traveling direction of the cooling air.

  The radiating fin 430X radiates the heat of the DMD 40 by the cooling air guided from the radiating fin 430R. The cooling air used for heat radiation is guided to a duct 312A provided at the outlet of the heat radiation fin 430X. The radiation fins 430X are provided with a plurality of radiation fins so as to be parallel to the traveling direction of the cooling air. In addition, the air flow path in which the heat radiating fins 430R and the heat radiating fins 430X are provided is referred to as a forward path.

  The duct 312A bends the traveling direction of the cooling air guided from the heat radiating fins 430X into a U shape and reverses the traveling direction by 180 °. Duct 312A guides the cooling air to radiating fins 430Y provided at the outlet of duct 312A. Corners in the vicinity of the air inlet and the air outlet of the duct 312A have curved surfaces, which makes it easy to change the traveling direction of the cooling air.

  The radiating fin 430Y radiates the heat of the driver board 500 by the cooling air guided from the duct 312A, and radiates the cooling air from the outlet 213A of the casing 200 provided at the outlet of the radiating fin 430Y to the outside of the casing 200. Discharge. The heat radiating fins 430Y are provided with a plurality of heat radiating fins so as to be parallel to the traveling direction of the cooling air. In addition, the air flow path in which the radiation fins 430Y are provided is referred to as a return path.

  A partition wall 610 is provided between the heat radiation fins 430R and 430X and the heat radiation fin 430Y to prevent leakage of cooling air. The partition wall 610 prevents the cooling air from directly entering the radiation fins 430Y from the radiation fins 430R and 430X.

  The fan 311A is disposed in the vicinity of the intake port 212A and functions as an intake fan, but is not limited thereto. For example, it is arranged near the exhaust port 213A and may act as an exhaust fan.

  In the first embodiment, the folded cooling unit as shown in FIG. 9 is shown as an example, but the present invention is not limited to this, and two folded cooling units of the first embodiment are connected to form an S-shape. A cooling unit having a shape may be used. Of course, two or more folded cooling units may be connected.

(Function and effect)
In the first embodiment, the air flow path connecting the intake port 212A and the exhaust port 213A has a folded shape, and the forward path from the intake port 212A and the return path to the exhaust port 213A are adjacent to each other. Therefore, the installation area required by the air flow path can be reduced, and the entire cooling unit can be reduced in size while ensuring the cooling performance.

  In the first embodiment, at least one radiating fin is disposed on each of the forward path and the return path. Therefore, the heat radiation fins can be provided densely on the air flow path by effectively using the forward path and the return path, and the cooling unit can be reduced in size.

  In the first embodiment, the air flow path and the radiating fin from the intake port 212A or the intake port 212B to the exhaust port 213A or the exhaust port 213B include a duct 312A (the duct 312A, the duct 200 by the inner wall of the housing 200, and the partition wall 610). ) Or 312B. Therefore, since the cooling air flowing through the air flow path is not released from the duct 312A or 312B, the cooling efficiency of the cooling unit can be improved.

  In the first embodiment, the discharge direction of the exhaust port 213B of the first cooling unit 710 and the exhaust port 213A of the second cooling unit 720 are the same direction. Accordingly, when the warmed cooling air is discharged from the projection display apparatus, it is easy to prevent the user from hitting the warmed cooling air.

  In the first embodiment, the fan 311A and the fan 311B are provided at diagonal positions. Therefore, since the generated fan operating sound is not concentrated in a specific direction, the user's discomfort due to excessive operating sound can be alleviated.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the embodiment, a DMD (Digital Micromirror Device) is merely illustrated as the light modulation element. The light modulation element may be a reflective or transmissive liquid crystal panel.

DESCRIPTION OF SYMBOLS 10 (10R, 10G, 10B) ... Light source, 20 ... Cross dichroic mirror, 30 ... Folding mirror, 40 ... DMD, 50 ... Projection unit, 51 ... Projection lens group, 52 ... Reflection mirror, 100 ... Projection type video display apparatus, 200 ... Case, 211 ... Transmission area, 212 (212A, 212B) ... Intake port, 213 (213A, 213B) ... Exhaust port, 311 (311A, 311B) ... Fan, 312 (312A, 312B) ... Duct, 400 ( 400R, 400G, 400B, 400X, 400Y) ... cooling unit, 410 ... heat receiving unit, 420 ... heat pipe, 430 (430R, 430G, 430B, 430X, 430Y) ... radiating fin, 600 ... gap part, 610 ... partition wall, 700 ... cooling device, 710 ... first cooling unit, 720 ... second cooling unit,

Claims (7)

An intake port for sucking cooling air from the outside;
A cooling unit comprising an exhaust port for discharging the cooling air to the outside,
An air flow path connecting the intake port and the exhaust port has a folded shape, and a forward path from the intake port and a return path to the exhaust port are adjacent to each other. The cooling unit according to claim 1, wherein
At least one heat dissipating member is disposed on each of the forward path and the return path. The cooling unit according to claim 2,
The cooling unit, wherein the air flow path from the intake port to the exhaust port and the heat radiating member are covered with a duct. A cooling unit according to claim 1;
In a cooling device comprising another cooling unit different from the cooling unit,
The cooling device according to claim 1, wherein the direction of the exhaust port of the cooling unit is the same as the direction of the exhaust port of the other cooling unit. The cooling device according to claim 4, wherein
A cooling fan arranged in the cooling unit for intake or exhaust of cooling air;
A cooling fan that is arranged in the other cooling unit and sucks or exhausts cooling air; and
The cooling device, wherein the cooling fan and the other cooling fan are provided at diagonal positions.   A projection display apparatus comprising the cooling unit according to claim 1.   A projection display apparatus comprising the cooling device according to claim 4.

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