JP2013025212A - Projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projector capable of efficiently cooling an object to be cooled.SOLUTION: A projector 1A for projecting an image comprises: a light source device 31; an optical modulator 33 for modulating a light beam emitted from the light source device 31; a projection optical device 35 for projecting the light beam modulated; and a cooling device 4A for cooling a predetermined object to be cooled. The cooling device 4A is provided with a plurality of heat pipes 42 along a projecting direction, P direction, of the light beam by the projection optical device 35. Each of the plurality of heat pipes 42 has: a heat receiving section to which heat generated in the object to be cooled is transmitted; and a heat radiator to which the heat transmitted to the heat receiving section is transmitted. The plurality of heat pipes 42 includes: a first heat pipe 421 in which the heat radiator is positioned at a projecting direction leading end side with respect to the heat receiving section; and a second heat pipe 422 in which the heat radiator is positioned at a projecting direction base end side with respect to the heat receiving section.

Description

  The present invention relates to a projector.

  Conventionally, a light source device, a light modulation device that modulates a light beam emitted from the light source device to form an image according to image information, and a projection optical device that enlarges and projects the image on a projection surface such as a screen A projector equipped with is known. Such a projector has a heat source such as a light source device or a control device. However, if such a heat source is not cooled effectively, a malfunction may occur in the operation of the projector.

On the other hand, an endothermic block abutting on the light source device and one end of the endothermic block connected to the endothermic block are capable of conducting heat, and extend along the central axis of the light beam projected by the projection optical device (projection optical means). A projector including a cooling device having a heat pipe and a heat radiating fin attached to the other end of the heat pipe is known (see, for example, Patent Document 1).
In the projector described in Patent Document 1, heat generated in the light source device is conducted to one end of the heat pipe through the heat absorption block. This heat is conducted to the other end by the medium in the heat pipe and is radiated by the radiation fins. With such a configuration, the light source device to be cooled is cooled.

  Here, if the heat absorption side of the heat pipe is located higher than the heat dissipation side, the heat at the heat absorption side is hardly conducted to the heat dissipation side. On the other hand, the projector may be used in a normal posture that is a posture placed on an installation table or the like, or in a ceiling posture that is fixed to a ceiling or the like upside down. Further, the projector is often used in a tilted state in which the projection direction of the light beam by the projection optical device is tilted with respect to the horizontal plane in each posture.

For this reason, in Patent Document 1, in a projector that is used in an upright position, a heat pipe is provided substantially parallel to the projection direction, and the end portion on the heat absorption side is positioned on the base side in the projection direction, which is the lower side in the inclined state. The end portion on the heat dissipation side is positioned on the front end side in the projection direction which is the upper side.
On the other hand, in the same document, in a projector that is used in a ceiling position, a heat pipe is provided substantially parallel to the projection direction, and the end on the heat dissipation side is positioned on the base end side in the projection direction, which is the upper side in the inclined state. The end of the heat absorption side is positioned on the front side in the projection direction, which is the lower side in the inclined state.

JP 2007-24939 A

  However, in the projector described in Patent Document 1, the position of the end portion on the heat absorption side and the end portion on the heat dissipation side of the heat pipe are different between the projector used in the normal position and the projector used in the ceiling position. For this reason, when the projector in the normal position is used in the ceiling position, the cooling efficiency of the cooling target is lowered, and there is a possibility that a problem occurs in the operation of the projector. For this reason, there is a problem that it is necessary to prepare a projector according to the installation posture.

  An object of the present invention is to provide a projector that can efficiently cool an object to be cooled.

  In order to achieve the above object, a projector according to the present invention is a projector that projects an image, and includes a light source device, a light modulation device that modulates a light beam emitted from the light source device, and the modulated light beam. A projection optical device for projecting; and a cooling device for cooling a predetermined cooling target, wherein the cooling device includes a plurality of heat pipes along a projection direction of the light flux by the projection optical device, and each of the heat pipes Has a heat receiving portion through which heat generated in the cooling target is conducted and a heat radiating portion through which heat conducted to the heat receiving portion is conducted, and the plurality of heat pipes include the heat receiving portion. On the other hand, the 1st heat pipe in which the said thermal radiation part is located in the said projection direction front end side, and the 2nd heat pipe in which the said thermal radiation part is located in the said projection direction base end side with respect to the said heat receiving part are included. And features.

  Examples of such a cooling target include a light source device and a light modulation device. In addition, a control device that controls the operation of the entire projector and a power supply device that supplies a voltage suitable for the components of the projector can also be cooled.

According to the present invention, the heat pipe includes a first heat pipe in which the heat radiating portion is located on the front side in the projection direction of the light flux by the projection optical device, with respect to the heat receiving portion that conducts heat generated in the cooling target, and the heat receiving portion. And a second heat pipe in which the heat dissipating part is located on the base end side in the projection direction with respect to the part.
According to this, when the projector is in the above-described normal posture and is in an upward inclined state in which the projection direction front end side is located above the base end side, the heat receiving portion of the first heat pipe is compared with the heat radiating portion. Since it becomes a low position, the heat conduction by the said 1st heat pipe can be performed appropriately. Further, in the normal placement posture and in a downward inclined state where the projection direction front end side is located below the base end side, the heat receiving portion of the second heat pipe is lower than the heat radiating portion. Therefore, heat conduction by the second heat pipe can be appropriately performed.

On the other hand, when the projector is in the above-described ceiling-suspended posture and in a downwardly inclined state, the heat receiving portion of the second heat pipe is positioned lower than the heat radiating portion, so that heat conduction by the second heat pipe is appropriately performed. It can be carried out. Further, when the ceiling suspension posture is in the upward inclined state, the heat receiving portion of the first heat pipe is positioned lower than the heat radiating portion, so that heat conduction by the first heat pipe can be appropriately performed. it can.
As described above, since heat conduction by at least one of the first heat pipe and the second heat pipe is efficiently performed regardless of the attitude and the inclined state of the projector, the heat generated in the cooling target is effectively obtained from the cooling target. Can be conducted electrically. Therefore, the object to be cooled can be efficiently cooled.

In the present invention, the cooling device includes a first heat radiating member and a second heat radiating member for radiating the conducted heat, and the heat radiating portion of the first heat pipe is connected to the first heat radiating member so as to be able to conduct heat. The heat radiating portion of the second heat pipe is preferably connected to the second heat radiating member so as to be able to conduct heat.
According to the present invention, the first heat radiating member is connected to the heat radiating portion of the first heat pipe so as to be able to conduct heat, and the second heat radiating member is connected to the heat radiating portion of the second heat pipe so as to be able to conduct heat. Even when only one of the first heat pipe and the second heat pipe functions, the heat conducted from the heat receiving portion to the heat radiating portion can be efficiently radiated by the heat radiating member connected to the one heat pipe. Therefore, the object to be cooled can be cooled more efficiently.

In the present invention, the cooling device houses therein a cooling fan that blows cooling air to the first heat radiating member and the second heat radiating member, and the cooling fan, the first heat radiating member, and the second heat radiating member, respectively. And a duct through which the cooling air circulates.
According to the present invention, since the cooling fan, the first heat radiating member, and the second heat radiating member are provided in the duct, the loss of the cooling air blown to the first heat radiating member and the second heat radiating member by the cooling fan. Can be suppressed. Therefore, the cooling effect of the first heat radiating member and the second heat radiating member can be enhanced, and as a result, the object to be cooled can be efficiently cooled.

In the present invention, the cooling fan is provided between the first heat dissipation member and the second heat dissipation member, and one of the first heat dissipation member and the second heat dissipation member is disposed in the duct. It is preferable that the other side is disposed on the exhaust side of the cooling fan in the duct.
According to the present invention, in the duct, one of the first heat radiating member and the second heat radiating member is disposed on the intake side of the cooling fan, and the other is disposed on the exhaust side of the cooling fan. According to this, cooling air can be blown by one cooling fan to the first heat radiating member and the second heat radiating member. Therefore, the configuration of the cooling device can be simplified and the manufacturing cost can be reduced.
Moreover, since the cooling fan is provided between the 1st heat radiating member and the 2nd heat radiating member in a duct, the noise which arises by the drive of the said cooling fan can be made hard to leak outside. Therefore, the noise of the projector can be reduced.

In the present invention, at least one of the first heat pipe and the second heat pipe may be bent so that the first heat radiating member and the second heat radiating member face each other in the duct. preferable.
According to the present invention, since the first heat radiating member and the second heat radiating member are arranged to face each other in the duct, the cooling air is blown linearly with respect to the first heat radiating member and the second heat radiating member. it can. Therefore, compared with the case where the flow path of the cooling air is bent, it is possible to suppress the loss of the wind pressure and the air volume during the flow of the cooling air, the cooling efficiency of the first heat radiating member and the second heat radiating member, and the cooling efficiency of the cooling target. Can be improved.

In the present invention, it is preferable that the first heat pipe and the second heat pipe each have a bent portion that bends at an obtuse angle between the heat receiving portion and the heat radiating portion.
Note that the angle of the bent portion is the smaller of the angles formed by the direction in which the heat receiving portion extends from the bent portion and the direction in which the heat radiating portion extends from the bent portion.
Here, the position where the heat radiating member can be attached varies from the bent portion according to the angle of the bent portion. Specifically, when the angle of the bent portion is larger than the right angle compared to the case where the angle is equal to or less than the right angle, the heat dissipation member can be attached at a position closer to the bent portion.
For this reason, in this invention, the angle of the bending part between a heat receiving part and a thermal radiation part is set to the obtuse angle. According to this, the heat radiating member can be attached at a position closer to the bent portion, and as a result, the heat radiating member can be attached at a position near the object to be cooled. Therefore, the cooling target can be cooled more effectively.
Further, since the bent portion is bent at an obtuse angle, even when the bent portion is bent at a right angle, the length of the heat radiating portion is the same as the straight line along the extending direction of the heat receiving portion and the heat radiating portion. It is possible to shorten the distance from the end portion on the opposite side to the bent portion side. Therefore, the cooling device can be reduced in size, and thus the projector can be reduced in size.

FIG. 1 is a schematic diagram illustrating a configuration of a projector according to a first embodiment of the invention. The perspective view which shows the cooling device in the said embodiment. The perspective view which shows the cooling device in the said embodiment. The top view which shows the cooling device in the said embodiment. The perspective view which shows the cooling device of the projector which concerns on 2nd Embodiment of this invention. The top view which shows the cooling device in the said embodiment.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described based on the drawings.
[Overall configuration of projector]
FIG. 1 is a schematic diagram illustrating a configuration of a projector 1A according to the present embodiment.
The projector 1A according to the present embodiment modulates a light beam emitted from a light source device 31 provided therein to form an image corresponding to image information, and enlarges and projects the image on a projection surface such as a screen. Is. As shown in FIG. 1, such a projector 1 </ b> A includes a housing 2, an optical device 3 and a cooling device 4 </ b> A housed and disposed in the housing 2. In addition, although not shown, the projector 1A includes a control device that controls the entire projector 1A, a power supply device that supplies power to the components of the projector 1A, and the like.

[Case structure]
The housing 2 is a generally rectangular parallelepiped housing made of synthetic resin or metal. The housing 2 has a front surface 21, a back surface 22, a left side surface 23, and a right side surface 24, and a top surface and a bottom surface (both not shown).
Among these, the front surface 21 is formed with an opening 211 through which the projection optical device 35 constituting the optical device 3 is exposed, and an image is projected through the opening 211. In addition, the front surface 21 is formed with an exhaust port 212 through which air used for cooling the cooling target is discharged by a cooling device 4A described later. Further, an intake port 231 through which cooling air is introduced from the outside of the housing 2 is formed on the left side surface 23.
In addition, although illustration is abbreviate | omitted, the bottom part of the housing | casing 2 is provided with the leg part contact | abutted to an installation surface, a ceiling, etc.

[Configuration of optical device]
The optical device 3 forms and projects an image according to the image information input from the above-described control device. The optical device 3 includes a light source device 31, a color separation optical device 32, a light modulation device 33, a color synthesis optical device 34, and a projection optical device 35. In addition, although not shown, the optical device 3 includes a uniform illumination optical device provided between the light source device 31 and the color separation optical device 32. This uniform illumination optical device equalizes the illuminance in a plane orthogonal to the central axis of the light beam emitted from the light source device 31, and includes a pair of lens arrays and a superimposing lens, and also the polarization direction of incident light. The structure which has the polarization conversion element which arranges to one kind can be illustrated.

The light source device 31 emits a light beam toward the color separation optical device 32 through the uniform illumination optical device. In this embodiment, the light source device 31 includes a substrate 311, a reflection unit 312, and a condenser lens 313.
A plurality of solid light sources (not shown) are arranged on the substrate 311. Examples of such a solid light source include a laser diode and an LED (Light Emitting Diode).
The reflection unit 312 is disposed so as to face the mounting surface of the solid-state light source on the substrate 311. Although not shown in the figure, a plurality of mirrors that reflect light emitted from the respective solid light sources toward the condenser lens 313 substantially in parallel are provided inside the reflecting portion 312.
The condensing lens 313 condenses the light incident through the reflecting portion 312 and emits it as a light beam.

The color separation optical device 32 separates each color light of red (R), green (G), and blue (B) from the incident light flux, and enters each color light into the light modulation device 33 (33R, 33G, 33B). Let The color separation optical device 32 includes dichroic mirrors 321 and 323 and total reflection mirrors 322, 324 and 325.
Of the incident light, the dichroic mirror 321 reflects blue light and transmits other light. The blue light reflected thereby enters the light modulator 33 (33B) for blue light. On the other hand, the light transmitted through the dichroic mirror 321 is incident on the dichroic mirror 323 after the optical path is bent by 90 degrees by the total reflection mirror 322.

Of the incident light, the dichroic mirror 323 reflects green light and transmits red light. The green light reflected thereby enters the light modulator 33 (33G) for green light. On the other hand, the red light transmitted through the dichroic mirror 323 is incident on the light modulator 33 (33R) for red light through the total reflection mirrors 324 and 325.
Although not shown, green light and red light have a longer optical path to reach the light modulation device 33 than blue light, so a relay lens that suppresses light loss on the optical path of these color lights is provided. You may arrange.

  A light modulation device 33 (light modulation devices for red, green, and blue color lights are respectively referred to as 33R, 33G, and 33B) is provided for each color light separated by the color separation optical device 32. These light modulation devices 33 modulate incident light and form an image corresponding to the image information input from the control device. Such a light modulation device 33 can be exemplified by a configuration having a liquid crystal panel and a pair of polarizing plates sandwiching the liquid crystal panel, although not shown.

The color synthesis optical device 34 synthesizes the color lights modulated by the respective light modulation devices 33. In the present embodiment, the color synthesis optical device 34 is configured by a cross dichroic prism, synthesizes each color light incident through three incident surfaces, and opposes the synthesized light (image light) to the projection optical device 35. The light exits from the outgoing surface.
The projection optical device 35 enlarges and projects the light combined by the color combining optical device 34 onto the above-described projection surface. The projection optical device 35 is configured as a combined lens having a lens barrel and a plurality of lenses arranged in the lens barrel.

[Configuration of cooling device]
FIG. 2 is a perspective view showing the cooling device 4A. In FIG. 2, the cooling device 4A in a state where a part of the duct 45 is removed is illustrated.
The cooling device 4A cools the light source device 31 (specifically, the substrate 311) to be cooled. As shown in FIGS. 1 and 2, the cooling device 4 </ b> A includes a heat receiving body 41, a plurality of heat pipes 42, a pair of radiating fins 43, a cooling fan 44, and a duct 45.

[Duct structure]
The duct 45 is a cylindrical body formed of synthetic resin, and connects the intake port 231 and the exhaust port 212 formed in the housing 2. A pair of heat radiation fins 43 and a cooling fan 44 are accommodated in the duct 45. The duct 45 is formed so that the flow direction of the cooling air flowing through the duct 45 is along the P direction that is the projection direction of the light beam by the projection optical device 35.

[Configuration of heat receiving body]
FIG. 3 is a perspective view showing the cooling device 4A viewed from the side opposite to FIG. FIG. 4 is a plan view showing the cooling device 4A. 3, illustration of the cooling fan 44 and the duct 45 is omitted, and illustration of the duct 45 is omitted in FIG.
The heat receiving body 41 is connected to at least a region of the substrate 311 in which the solid light sources are arranged so as to conduct heat, and receives heat generated in the substrate 311. The heat receiving body 41 is formed in a horizontally long rectangular parallelepiped shape from a metal having thermal conductivity, and the longitudinal direction of the heat receiving body 41 is substantially parallel to the P direction.
In the heat receiving body 41, a plurality of grooves 411 into which the heat pipes 42 are fitted are formed on the side opposite to the side facing the substrate 311 as shown in FIGS. 3 and 4.

[Configuration of heat pipe]
As shown in FIGS. 2 to 4, the heat pipe 42 (421, 422) has one end side connected to the heat receiving body 41 so as to be able to conduct heat, and the heat conducted from the heat receiving body 41 is provided on the other end side. Conducted to the radiation fins 43.
These heat pipes 42 include a heat receiving portion 42A that extends linearly, a heat radiating portion 42B that also extends linearly, and a bent portion 42C formed between the heat receiving portion 42A and the heat radiating portion 42B. It is formed in a substantially L shape. Of these, the bent portion 42C is bent at a substantially right angle in the present embodiment.

Such heat pipes 42 are arranged along the P direction, respectively, but depending on the positions of the heat radiating part 42B and the bent part 42C with respect to the heat receiving part 42A, the first heat pipe 421 and the second heat pipe 422 are connected to each other. It is divided.
Specifically, the heat receiving portions 42A of the first heat pipe 421 and the second heat pipe 422 are respectively formed in the groove portions 411 along the longitudinal direction of the heat receiving body 41 (that is, the P direction that is the projection direction by the projection optical device 35). It is fitted and fixed to the heat receiving body 41 with solder.
On the other hand, the bent portion 42C of the first heat pipe 421 is located on the front end side in the P direction with respect to the heat receiving portion 42A, whereas the bent portion 42C of the second heat pipe 422 is P with respect to the heat receiving portion 42A. It is located on the direction base end side.

Further, the heat radiating portions 42B of the first heat pipe 421 and the second heat pipe 422 extend from the respective bent portions 42C in a direction away from the heat receiving body 41. The heat radiating portion 42B of the first heat pipe 421 is connected to the heat radiating fin 43 (first heat radiating fin 431), and the heat radiating portion 42B of the second heat pipe 422 is connected to the heat radiating fin 43 (second heat radiating fin 432). It is connected.
In such a heat pipe 42, the temperature on the heat receiving portion 42 </ b> A side where the heat generated in the light source device 31 is transmitted via the heat receiving body 41 is higher than the temperature on the heat radiating portion 42 </ b> B side connected to the heat radiating fins 43. The heat of the heat receiving portion 42A is conducted to the heat radiating portion 42B.

In the present embodiment, a total of eight heat pipes 42 including four first heat pipes 421 and four second heat pipes 422 are attached to the heat receiving body 41. The first heat pipes 421 and the second heat pipes 422 are alternately arranged in the vertical direction.
By arranging the first heat pipe 421 and the second heat pipe 422 in this way, it is possible to suppress the temperature distribution bias of the heat receiving body 41, and thus to suppress the temperature distribution bias of the substrate 311.

[Configuration of heat dissipation fins]
Each radiating fin 43 (431, 432) has a structure in which a plurality of flat plate-like bodies 43A along the vertical plane are arranged at equal intervals along the horizontal direction. The same. These radiating fins 43 are arranged opposite to each other in the duct 45.
Among such radiating fins 43, the first radiating fin 431 corresponding to the first radiating member of the present invention is located on the front side in the P direction with respect to the second radiating fin 432. The first heat radiating fins 431 are connected to the heat radiating portions 42B so as to conduct heat so that the heat radiating portions 42B of the first heat pipes 421 pass through the plate-like bodies 43A of the first heat radiating fins 431.

Further, the second heat radiation fin 432 corresponding to the second heat radiation member of the present invention is located on the P direction base end side with respect to the first heat radiation fin 431. The second heat radiating fins 432 are connected to the heat radiating portions 42B so as to allow heat conduction so that the heat radiating portions 42B of the second heat pipes 422 pass through the plate-like bodies 43A of the second heat radiating fins 432.
The first heat radiating fins 431 and the second heat radiating fins 432 radiate the heat conducted from the first heat pipe 421 and the second heat pipe 422, respectively. At this time, since the first heat pipes 421 and the second heat pipes 422 are alternately arranged along the vertical direction, the heat in the heat radiation fins 431 and 432 is larger than the arrangement pitch of the heat pipes 42 in the heat receiving body 41. The arrangement pitch of the pipes 42 can be doubled. Therefore, the heat radiation effect by each radiation fin 43 can be enhanced.

[Configuration of cooling fan]
The cooling fan 44 is disposed in the duct 45 between the first radiating fins 431 and the second radiating fins 432. The cooling fan 44 is an axial fan, and is disposed such that the intake side faces the second radiating fin 432 and the exhaust side faces the first radiating fin 431.
When the cooling fan 44 is driven, cooling air outside the housing 2 is introduced into the duct 45 through the air inlet 231. As shown in FIG. 4, the cooling air passes between the plate-like bodies 43 </ b> A of the second radiating fins 432 in the process of reaching the intake surface of the cooling fan 44. Thereby, the cooling air is blown to the second radiation fins 432, and the second radiation fins 432 are cooled.

The cooling air sucked by the cooling fan 44 is discharged toward the first heat radiation fins 431 and passes between the plate-like bodies 43A of the first heat radiation fins 431. As a result, cooling air is blown to the first radiation fins 431, and the first radiation fins 431 are cooled.
The cooling air used for cooling the first heat radiation fins 431 and the second heat radiation fins 432 further flows through the duct 45 and is discharged out of the housing 2 through an exhaust port 212 formed in the front surface 21.

[Operation of cooling device]
Here, the properties of the heat pipe and the usage state of the projector will be described, and the operation of the cooling device 4A for these will be described below.
When the temperature on one end side is higher than the temperature on the other end side, the heat pipe conducts heat on the one end side to the other end side. At this time, if one end side where the temperature is high is lower than the other end side (the lower side in the vertical direction), heat conduction from the one end side to the other end side is efficiently performed.
However, if one end side where the temperature is high is higher than the other end side (upper side in the vertical direction), the heat conduction efficiency from the one end side to the other end side decreases.

On the other hand, the projector 1A is an upright posture in which the bottom surface of the projector 1A is disposed so as to face the installation surface, and the projection direction of the projection optical device 35 is an upward inclined state and a downward inclined state in which the projection direction is inclined with respect to the horizontal plane. May be used.
On the other hand, the projector 1A is used in a suspended posture in which the bottom surface of the projector 1A faces the ceiling, and the projection direction of the projection optical device 35 is tilted downward and tilted upward with respect to the normal of the projection surface. Sometimes.
In such a usage state of the projector 1A, when only one of the first heat pipe 421 and the second heat pipe 422 is provided in the above-described cooling device 4A, the above-described heat conduction is not effectively performed. Can occur.

That is, when only the first heat pipe 421 is provided in the cooling device 4A, the heat receiving portion 42A of the first heat pipe 421 is the heat radiating portion 42B in the upwardly inclined state in the normal placement posture and the ceiling suspension posture. Lower position. In this case, heat conduction from the heat receiving portion 42A to the heat radiating portion 42B is performed efficiently.
On the other hand, in the downward inclined state in the normal placement posture and the ceiling suspension posture, the heat receiving portion 42A of the first heat pipe 421 is positioned higher than the heat radiating portion 42B. In this case, since heat conduction from the heat receiving portion 42A to the heat radiating portion 42B is difficult to be performed, cooling of the heat receiving body 41, and thus cooling of the light source device 31 is difficult to be performed appropriately.

In addition, in the case where only the second heat pipe 422 is provided in the cooling device 4A, and in the downward inclined state in the normal placement posture and the ceiling suspension posture, the heat receiving portion 42A of the second heat pipe 422 becomes the heat radiating portion 42B. On the other hand, the position is low. In this case, heat conduction from the heat receiving portion 42A to the heat radiating portion 42B is performed efficiently.
On the other hand, in the upward inclined state in the normal placement posture and the ceiling suspension posture, the heat receiving portion 42A of the second heat pipe 422 is positioned lower than the heat radiating portion 42B. In this case, since heat conduction from the heat receiving portion 42A to the heat radiating portion 42B is difficult to be performed, similarly to the above-described case, it is difficult to properly cool the heat receiving body 41, and hence the light source device 31.

  On the other hand, in the present embodiment, the cooling device 4A is configured such that the heat radiating portion 42B is located on the tip side with respect to the heat receiving portion 42A in the P direction (projection direction of the light beam by the projection optical device 35) The first heat pipe 421 attached to the heat receiving body 41 and the heat radiating portion 42B are located on the base end side in the P direction with respect to the heat receiving portion 42A, and the second heat pipe 422 is attached to the heat receiving body 41 along the P direction. With.

With such a configuration, when the projector 1 </ b> A is used in either the normal placement posture or the ceiling suspension posture and in the upward inclined state, the heat receiving body 41 by the first heat pipe 421 is moved to the first heat radiation fin 431. Is efficiently conducted.
Further, when the projector 1 </ b> A is used in any of the normal placement posture and the ceiling suspension posture and in the downward inclined state, the heat conduction from the heat receiving body 41 to the second radiation fins 432 by the second heat pipe 422 is performed. It is done efficiently.
Therefore, the heat receiving body 41 can be efficiently cooled, and thus the light source device 31 that is the cooling target can be efficiently cooled regardless of the posture and the inclined state of the projector 1A.

The projector 1A according to the present embodiment described above has the following effects.
That is, even when the projector 1A is used in each of the normal position and the ceiling position, the light source device is configured by the heat pipe 42 in which the position of the heat receiving portion 42A is lower than the heat radiating portion 42B regardless of the inclined state of the projector 1A. The heat of the heat receiving body 41 conducted from 31 can be efficiently conducted from the heat receiving portion 42A connected to the heat receiving body 41 to the heat radiating portion 42B. Therefore, the heat receiving body 41 and by extension, the light source device 31 can be efficiently cooled.

  The heat radiating part 42B of the first heat pipe 421 is connected to the first heat radiating fin 431 so as to be able to conduct heat, and the heat radiating part 42B of the second heat pipe 422 is connected to the heat radiating part 42B so as to be able to conduct heat. Yes. According to this, even when only one of the first heat pipe 421 and the second heat pipe 422 functions properly, the heat radiating fins 43 connected to the one heat pipe 42 cause the heat receiving part 42A to the heat radiating part 42B. Conducted heat can be efficiently dissipated. Therefore, it is possible to efficiently cool the light source device 31 that is a cooling target.

The first radiating fins 431 and the second radiating fins 432, and the cooling fan 44 that blows cooling air to the radiating fins 431 and 432 are provided in the duct 45. According to this, it is possible to suppress the loss of the cooling air blown to the radiation fins 431 and 432 by the cooling fan 44. Therefore, the cooling effect of the radiation fins 431 and 432 can be enhanced, and the light source device 31 can be efficiently cooled.
The exhaust port 212 connected to the duct 45 is formed in the front surface 21 where the projection optical device 35 is exposed in the housing 2. According to this, when the projector 1A is used, the exhaust port 212 can be prevented from being covered with an obstacle, and the heated cooling air can be prevented from being discharged toward the user of the projector 1A. .

In the duct 45, the second radiating fins 432 are arranged on the intake side of the cooling fan 44, and the first radiating fins 431 are arranged on the exhaust side of the cooling fan 44. According to this, the cooling air can be blown by the single cooling fan 44 to each of the radiation fins 431 and 432. Therefore, the configuration of the cooling device 4A can be simplified, and the manufacturing cost can be reduced.
Further, since the cooling fan 44 is provided between the first radiating fins 431 and the second radiating fins 432 in the duct 45, noise generated by driving the cooling fan 44 is outside the duct 45, and thus outside the projector 1A. Can be made difficult to leak. Therefore, the noise of the projector 1A can be reduced.

  The first heat pipe 421 and the second heat pipe 422 are bent at bent portions 42C, and the first heat radiating fins 431 and the second heat radiating fins 432 connected to the heat radiating portions 42B of the heat pipes 421 and 422, respectively. Are arranged so as to face each other in the duct 45. According to this, the cooling fan 44 can blow cooling air linearly with respect to the first radiating fins 431 and the second radiating fins 432. Therefore, compared with the case where the flow path of the cooling air is bent, the loss of the wind pressure and the air volume of the cooling air can be suppressed, the cooling efficiency of the heat radiation fins 431 and 432 can be improved, and the light source device 31 can be cooled more efficiently. it can.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described.
The projector according to the present embodiment has the same configuration and function as the projector 1A described above. Here, in the projector 1A, the angle of the bent portion 42C in each heat pipe 42 is substantially a right angle, but in the projector according to the present embodiment, the angle of the bent portion in the heat pipe is an obtuse angle. In this respect, the projector according to the present embodiment is different from the projector 1A. In the following description, parts that are the same as or substantially the same as those already described are assigned the same reference numerals and description thereof is omitted.

FIG. 5 is a perspective view showing the cooling device 4B of the projector 1B according to the present embodiment. FIG. 6 is a plan view showing the cooling device 4B.
Although detailed illustration is omitted, the projector 1B according to the present embodiment has the same configuration and functions as the projector 1A except that the cooling device 4B is provided instead of the cooling device 4A.
As shown in FIGS. 5 and 6, the cooling device 4B includes a heat receiving body 41, a plurality of heat pipes 46, a pair of heat radiation fins 47, a cooling fan 44, and a duct 45 (not shown in FIGS. 5 and 6). The light source device 31 that is a cooling target is cooled.

[Configuration of heat pipe]
The heat pipe 46 is disposed along the P direction in the same manner as the heat pipe 42 described above. These heat pipes 46 include a linear heat receiving portion 46A attached to the groove portion 411 of the heat receiving body 41 so as to conduct heat, a linear heat radiating portion 46B connected to the radiating fin 47 so as to conduct heat, and these heat receiving portions 46A. And a bent portion 46C that is sandwiched between the heat radiating portions 46B and bent at an obtuse angle. The angle of the bent portion 46C refers to the smaller one of the angles formed by the direction in which the heat receiving portion 46A extends from the bent portion 46C and the direction in which the heat radiating portion 46B extends from the bent portion 46C. In this embodiment, it is set to approximately 120 degrees.

Such a heat pipe 46 is divided into a first heat pipe 461 and a second heat pipe 462 according to the positions of the heat radiating part 46B and the bent part 46C with respect to the heat receiving part 46A.
That is, the heat pipe 46 where the bent portion 46C and the heat radiating portion 46B are located on the distal side in the P direction with respect to the heat receiving portion 46A is the first heat pipe 461, and on the proximal end side in the P direction with respect to the heat receiving portion 46A. The heat pipe 46 where the bent part 46C and the heat radiating part 46B are located is the second heat pipe 462.
The first heat pipe 461 and the second heat pipe 462 are arranged so that the end portions of the heat radiating portion 46B opposite to the bent portion 46C side are separated from each other as the distance from the bent portion 46C increases.
Of the heat radiation fins 47, the first heat radiation fin 471 is connected to the heat radiation portion 46 </ b> B of the first heat pipe 461 so as to conduct heat, and the second heat radiation fin 472 is connected to the heat radiation portion 46 </ b> B of the second heat pipe 462. Are connected so as to be capable of conducting heat.

In the cooling device 4B, a total of eight heat pipes 46 including four first heat pipes 461 and four second heat pipes 462 are attached to the heat receiving body 41 as in the cooling device 4A. . The first heat pipes 461 and the second heat pipes 462 are alternately arranged in the vertical direction.
By arranging the first heat pipe 461 and the second heat pipe 462 in this manner, the temperature distribution of the heat receiving body 41 and the temperature distribution of the substrate 311 can be suppressed. In addition, since the arrangement pitch of the heat pipes 46 in each heat radiation fin 47 is wider than the arrangement pitch of the heat pipes 46 in the heat receiving body 41, the heat radiation effect of each heat radiation fin 47 can be improved.

[Configuration of heat dissipation fins]
The pair of radiating fins 47 (471, 472) has a configuration in which a plurality of plate-like bodies 47A arranged along the vertical plane are arranged at equal intervals along the horizontal direction. These heat radiation fins 47 have the same configuration, but the first heat radiation fins 471 and the second heat radiation fins 472 are disposed so as to be upside down. These radiating fins 47 are arranged to face each other in the duct 45 by bending the heat pipes 461 and 462 described above.
Among these radiating fins 47, the first radiating fin 471 corresponding to the first radiating member of the present invention is located on the tip side in the P direction with respect to the second radiating fin 472, and the first radiating fin 471 includes the first radiating fin 471. The heat radiating part 46B of the heat pipe 461 is connected so as to penetrate each plate-like body 47A.
In addition, the second heat radiation fin 472 corresponding to the second heat radiation member of the present invention is positioned on the proximal side in the P direction with respect to the first heat radiation fin 471, and the second heat radiation fin 472 includes the second heat pipe 462. The heat radiation part 46B is connected so as to penetrate each plate-like body 47A.
And each radiation fin 471,472 releases the heat | fever conducted from the 1st heat pipe 461 and the 2nd heat pipe 462 by each plate-shaped body 47A.

Here, unlike the plate-like body 43A, the plate-like body 47A includes a pair of flat surface portions 47A1 and 47A2 and a connection portion 47A3 that connects the flat surface portions 47A1 and 47A2.
The flat portion 47A1 is disposed along the P direction, and is located on the proximal side in the P direction in the first radiating fin 471 and located on the distal side in the P direction in the second radiating fin 472.
The flat portion 47A2 is disposed along the P direction, and is positioned on the distal end side in the P direction in the first radiating fin 471, and is positioned on the proximal end side in the P direction in the second radiating fin 472.
The connecting portion 47A3 is inclined with respect to the P direction. The inclination direction of the connection portion 47A3 is a direction orthogonal to the extending direction of the heat dissipation portion 46B penetrating the connection portion 47A3 (the axial direction of the heat dissipation portion 46B).

According to the projector 1B according to the present embodiment described above, in addition to the same effects as the projector 1A described above, the following effects can be achieved.
In the cooling device 4B, when the cooling fan 44 disposed between the first heat radiating fins 471 and the second heat radiating fins 472 is driven, the cooling air is introduced into the duct 45 from the air inlet 231 as described above. As shown in FIG. 6, the cooling air flows along the P direction and is sucked by the cooling fan 44, and flows between the plate-like bodies 47 </ b> A of the second radiating fins 472, so that the second heat radiating is performed. The fins 472 are cooled. At this time, the plane portions 47A1 and 47A2 of each plate-like body 47A are arranged along the P direction, and the crossing angle of the connecting portion 47A3 with respect to the P direction is an obtuse angle (in the present embodiment, approximately 150 degrees). Therefore, the cooling air can circulate between the plate-like bodies 47A without stagnation.

The cooling air that has cooled the second radiating fins 472 is sucked by the cooling fan 44 and discharged toward the first radiating fins 471, and flows between the plate-like bodies 47A of the first radiating fins 471. At this time, like the above-described second radiation fin 472, the flat portions 47A1 and 47A2 of each plate-like body 47A are arranged along the P direction, and the crossing angle of the connection portion 47A3 with respect to the P direction is an obtuse angle. By being, cooling air can distribute | circulate, without stagnating between each plate-shaped body 47A.
Accordingly, since the cooling air smoothly flows to the second radiating fins 472 and the first radiating fins 471, the second radiating fins 472 and the first radiating fins 471 can be efficiently cooled, and consequently the light source to be cooled. The apparatus 31 can be cooled efficiently.

  The first heat pipe 461 and the second heat pipe 462 are bent so that the angle of the bent portion 46C becomes an obtuse angle. As a result, as shown in FIG. 6, the dimension L from the extended surface of the surface of the heat receiving body 41 where the groove 411 is formed to the end of each heat radiating section 46B opposite to the heat receiving body 41 is approximately perpendicular. Compared with the case where the heat pipe 42 bent and formed is provided, it can be made smaller. Accordingly, the inner diameter of the duct 45 that accommodates the heat pipes 461, 462, the radiation fins 47, and the cooling fan 44 can be reduced, so that the size of the cooling device 4B, and hence the projector 1B, can be suppressed.

  In addition, since the angle of the bent portion 46C is an obtuse angle, the portion where the bent portion 46C changes to the heat radiating portion 46B can be positioned closer to the heat receiving body 41 than when the angle is a right angle or less. . According to this, in the heat radiating part 46B, the heat radiating fins 47 can be arranged at positions close to the heat receiving body 41. Therefore, since the heat transfer path from the heat receiving body 41 to the radiation fins 47 can be shortened, the heat receiving body 41 can be quickly cooled, and the light source device 31 can be efficiently cooled.

  Furthermore, the cooling device 4 </ b> B has a structure in which the position of the bent portion 46 </ b> C bent at an obtuse angle is not the end of the heat receiving body 41. Accordingly, eight heat pipes 46 are arranged in the central region of the heat receiving body 41, and from the central region to the end of the heat receiving body 41 (from the position of the bent portion 46C of the heat pipe 46, from the bent portion 41). Four heat pipes are respectively arranged between the end of the heat receiving body 41 in the direction opposite to the direction toward the heat receiving portion 46A. As described above, since the heat pipes 46 are present in the central region where the temperature of the heat receiving body 41 is higher than the end portions of the heat receiving body 41, the temperature of the heat receiving body 41 is made more uniform. The maximum temperature can be lowered.

[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 embodiments, the first heat pipes 421 and 461 are connected to the first heat radiation fins 431 and 471, and the second heat pipes 422 and 462 are connected to the second heat radiation fins 432 and 472. However, the present invention is not limited to this. That is, it is good also as a structure by which each heat pipe 42 and 46 is connected to one heat radiating member so that heat conduction is possible.

  In each of the above-described embodiments, the heat radiation fins 43 and 47 in which a plurality of plate-like bodies 43A and 47A are arranged at equal intervals are exemplified as the first heat radiation member and the second heat radiation member, but the present invention is not limited to this. That is, any material having a heat dissipation characteristic, shape and properties can be employed as a heat dissipation member. For example, a heat sink having a plurality of protrusions may be employed as the heat radiating member.

In each said embodiment, although the cooling fan 44 was arrange | positioned between a pair of radiation fins 43 and 47 in the duct 45, this invention is not limited to this. That is, even if the cooling fan 44 is disposed on the front end side (downstream side) or the base end side (upstream side) of the cooling air with respect to the pair of radiating fins 43 and 47 in the cooling air flow path. Good. That is, the arrangement of the cooling fan 44 can be set as appropriate as long as the cooling air can be appropriately supplied to the heat radiation fins 43 and 47.
Further, the flow direction of the cooling air in the duct 45 may not be the direction along the P direction that is the projection direction of the light beam by the projection optical device 35.

  In the first embodiment, the angle of the bent portion 42C of the heat pipe 42 is substantially a right angle, and in the second embodiment, the angle of the bent portion 46C of the heat pipe 46 is 120 degrees. Is not limited to this. That is, the angle of the bent portion in the heat pipe may be set as appropriate. Even when the angle is set to an obtuse angle, it can be set as appropriate based on the arrangement of the heat pipes, the heat radiating fins and the cooling fan, the flow direction of the cooling air, and the projection direction of the light beam by the projection optical device. is there.

  In each of the above embodiments, the first heat radiation fins 431 and 471 as the first heat radiation members and the second heat radiation fins 432 and 472 as the second heat radiation members are arranged so as to face each other in the duct 45, and these Although the cooling fan 44 is disposed between them, the present invention is not limited to this. In other words, the first heat radiating member and the second heat radiating member may be spaced apart and a cooling fan may be provided for cooling each of the heat radiating members individually.

  In the first embodiment, the first heat pipe 421 and the second heat pipe 422 have the same shape and the same configuration. In the second embodiment, the first heat pipe 461 and the second heat pipe 462 are And having the same shape and the same configuration. However, the present invention is not limited to this. That is, heat pipes having different shapes and configurations may be used for the first heat pipe and the second heat pipe. For example, you may employ | adopt the linear heat pipe which does not have a bending part in at least one of the said 1st heat pipe and the 2nd heat pipe. The radiating fins 43 and 47 may not have the same shape and configuration.

  In each of the embodiments described above, the radiation fins 43 and 47 are cooled by the cooling air supplied by the cooling fan 44, but the present invention is not limited to this. That is, as long as the airtightness in the duct 45 can be ensured, the respective radiation fins may be cooled by a liquid cooling fluid such as ethylene glycol.

In each of the above embodiments, the light source device 31 has a solid light source, but the present invention is not limited to this. For example, you may employ | adopt the light source device which has light source lamps, such as an ultrahigh pressure mercury lamp, and a reflective mirror.
In each said embodiment, although cooling device 4A, 4B cooled the light source device 31 as cooling object, this invention is not restricted to this. That is, another configuration may be set as a cooling target. For example, the light modulation device, the control device, and the power supply device may be cooled.

In each of the above embodiments, the projectors 1A and 1B are each configured to include the three light modulation devices 33 each having a liquid crystal panel, but the present invention is not limited to this. That is, the present invention can also be applied to a projector including two or less or four or more light modulation devices.
In each of the above embodiments, the light modulation device 33 is configured to have a transmissive liquid crystal panel in which the light incident surface and the light exit surface are different, but the reflection type in which the light incident surface and the light exit surface are the same. It is good also as a structure which has this liquid crystal panel.

  In each of the above embodiments, the projectors 1A and 1B including the light modulation device 33 having the liquid crystal panel and the polarizing plate are exemplified. However, the incident light beam is modulated to form an image (optical image) according to the image information. As long as it is a light modulation device, a light modulation device having another configuration may be adopted. For example, the present invention can be applied to a projector using a light modulation device other than liquid crystal, such as a device using a micromirror.

  The present invention can be suitably used for a projector.

  DESCRIPTION OF SYMBOLS 1A, 1B ... Projector, 4A, 4B ... Cooling device, 31 ... Light source device (cooling object), 33 (33R, 33G, 33B) ... Light modulation device, 35 ... Projection optical device, 44 ... Cooling fan, 45 ... Duct, 421, 461 ... first heat pipe, 422, 462 ... second heat pipe, 431, 471 ... first radiating fin (first radiating member), 432, 472 ... second radiating fin (second radiating member), 42A, 46A ... heat receiving portion, 42B, 46B ... heat radiating portion, 42C, 46C ... bent portion, P ... projection direction.

Claims (6)

A projector for projecting an image,
A light source device;
A light modulation device for modulating a light beam emitted from the light source device;
A projection optical device for projecting the modulated luminous flux;
A cooling device for cooling a predetermined cooling object,
The cooling device includes a plurality of heat pipes along the projection direction of the light flux by the projection optical device,
Each said heat pipe
A heat receiving portion through which heat generated in the cooling target is conducted;
A heat dissipating part through which heat conducted to the heat receiving part is conducted,
In the plurality of heat pipes,
A first heat pipe in which the heat dissipating part is located on the front side in the projection direction with respect to the heat receiving part;
And a second heat pipe in which the heat dissipating part is located on the base side in the projection direction with respect to the heat receiving part. The projector according to claim 1.
The cooling device includes a first heat radiating member and a second heat radiating member for radiating heat conducted respectively.
The heat radiating portion of the first heat pipe is connected to the first heat radiating member so as to be capable of conducting heat,
The heat dissipation part of the second heat pipe is connected to the second heat dissipation member so as to be able to conduct heat. The projector according to claim 2,
The cooling device is
A cooling fan that blows cooling air to each of the first heat radiating member and the second heat radiating member;
A projector comprising: the cooling fan, the first heat radiating member, and the second heat radiating member housed therein; and a duct through which the cooling air flows. The projector according to claim 3.
The cooling fan is provided between the first heat radiating member and the second heat radiating member,
Of the first heat dissipation member and the second heat dissipation member,
One is arranged on the intake side of the cooling fan in the duct,
The other is disposed on the exhaust side of the cooling fan in the duct. The projector according to claim 4,
At least one of the first heat pipe and the second heat pipe is bent so that the first heat radiating member and the second heat radiating member are opposed to each other in the duct. . The projector according to claim 5, wherein
Each of the first heat pipe and the second heat pipe has a bent portion that bends at an obtuse angle between the heat receiving portion and the heat radiating portion.

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