JP2010262153A - projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector that has improved efficiency in cooling an object to be cooled. <P>SOLUTION: In a projector, a cooling device for sending a current of cooling air W to an object to be cooled includes: a cooling fan for taking in the cooling air W; and a duct 8 having first and second passages 8A1 and 8A2 and 8B1 for circulating the cooling air W, discharged from the cooling fan, in a first direction, and then circulating the cooling air W in a second direction intersecting the first direction, thereby guiding the cooling air W to the position where an object to be cooled is disposed. A plurality of guide members 9 to 11 for guiding cooling air W are disposed in the duct 8. The guide members 9 to 11 are formed across the position where the first and second directions intersect. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projector.

2. Description of the Related Art Conventionally, a projector including a blowing unit (cooling fan) that sucks and discharges cooling air from the outside and an L-shaped air passage (duct) that is connected to the cooling fan and discharges cooling air to a cooling target. (For example, refer to Patent Document 1).
The duct described in Patent Document 1 is formed in an L shape in plan view, and is divided into a first flow path and a second flow path by a first guide member.
The first flow path includes an outlet that discharges cooling air toward the light modulator on the green light side. A second guide member that rectifies the cooling air that follows the first flow path is disposed in the first flow path. The second guide member is disposed so as to extend from the downstream side of the L-shaped bent portion of the first flow path toward the outlet along the air flow direction.

JP 2007-58242 A

  However, in the projector described in Patent Document 1, the second guide member disposed in the first flow path starts from the downstream side of the bent portion of the first flow path in the cooling air flow direction. Accordingly, the flow rate following the outside of the bent portion of the first flow path of the duct and the flow rate following the inside are not uniform. Specifically, since the flow rate that follows the outside of the bent portion of the first flow path is larger than the flow rate that follows the inside, the cooling air that follows the outside of the bent portion with a high flow rate is at the inner wall portion outside the bent portion. Friction is likely to occur, causing pressure loss. Thereby, the flow rate of the cooling air is reduced, and there is a problem that a sufficient flow rate of the cooling air cannot be ensured for the cooling target, and the cooling efficiency is deteriorated.

  An object of the present invention is to provide a projector that can improve the cooling efficiency of a cooling target.

  The projector of the present invention is a projector including a cooling device that blows cooling air to a cooling target, and the cooling device includes a cooling fan that sucks the cooling air, and cooling air discharged from the cooling fan. And a duct having a flow path that circulates in a second direction intersecting the first direction and leads to the arrangement position of the object to be cooled. Is provided with a plurality of guide members for guiding the cooling air, and the plurality of guide members are formed across a position where the first direction and the second direction intersect. To do.

In the present invention, the plurality of guide members are formed so as to straddle the position where the first direction and the second direction intersect. According to this, when the cooling air is discharged into the duct, the flow rates of the cooling air that follow the position where the first direction and the second direction of the duct intersect are made uniform by the plurality of guide members, respectively. The pressure loss that occurs at the position where the first direction and the second direction of the duct intersect can be reduced.
Therefore, by reducing the pressure loss, it is possible to prevent a decrease in the flow rate of the cooling air and improve the cooling efficiency of the object to be cooled.

  In the projector according to the aspect of the invention, the cooling target includes first, second, and third light modulation devices that modulate color light of three colors according to image information, and a light incident side and a light emission side of each of the light modulation devices. The first and second light modulation devices are arranged to face each other, and the duct is connected to the first duct portion and the second by the guide member. Branching into a duct part, the first duct part flows out cooling air to the third light modulator, and the second duct part flows cooling air to the first and second light modulators. It is preferable.

  In the present invention, the duct is divided into a first duct portion for flowing cooling air to the third light modulation device and a second duct portion for flowing cooling air to the first and second light modulation devices by the guide member. Branch off. For example, the cooling air that follows the first duct portion flows out only to the third light modulation device, and the cooling air that follows the second duct portion flows out to the first and second light modulation devices. The first, second, and third light modulation devices can be efficiently cooled.

  In the projector according to the aspect of the invention, the second duct portion extends in the second direction along the optical axis of the incident light beam to the first and second light modulators, and the first light modulator is The outlet that is disposed upstream of the second light modulation device in the flow direction of the cooling air and flows out of the cooling air to the first light modulation device is the first light modulation device in plan view. It is preferable to extend across the incident side optical element and the emission side optical element.

  In the present invention, the second duct portion extends in the second direction, and the outlet of the second duct portion is the optical axis of the incident light beam of the first light modulation device, the incident side optical element, and the emission side optical element. Is formed so as to extend in a direction along the line. According to this, cooling air flows out reliably to these members, and can be cooled favorably.

  In the projector according to the aspect of the invention, the first duct portion includes an air guide passage that circulates cooling air in a direction along the light incident surface and the light exit surface of the third light modulation device. It is preferable to include an inclined portion that inclines in a direction away from the third light modulation device in the vertical direction as it goes to the third light modulation device.

By the way, conventionally, the cooling air flowing out from the cooling fan through the duct flows in the duct in the direction perpendicular to the optical axis of the incident light beam to the light modulation device, and then passes through the outlet of the light modulation device. It flows along the light entrance surface and the light exit surface of the light modulation device from below to above. Therefore, before the cooling air flows out of the duct through the outlet, the direction of the cooling air is changed in the direction perpendicular to the optical axis of the incident light beam to the light modulator inside the duct. In contrast, it flows in an oblique direction and flows along a diagonal line of the light modulation device formed in a rectangular shape. Therefore, there is a possibility that the cooling air may not flow to part of the light incident surface and the light emission surface of the light modulation device, and there is a problem that the light modulation device is not cooled uniformly.
In the present invention, the air guide path includes an inclined portion that is inclined in a direction away from the third light modulation device in the vertical direction toward the third light modulation device. A flow path (hereinafter referred to as an outflow flow path) through which the cooling air after passing through the air guide path flows toward the third light modulation device can be secured without mechanical interference.
According to this, since the cooling air flows to the third light modulation device from the air guide path via the outflow channel, the cooling air flows in an oblique direction with respect to the opening surface of the outflow port in the outflow channel. It will be controlled and will flow out in the direction substantially orthogonal to the opening surface of the outlet. That is, the cooling air can be made to flow uniformly over the light incident surface and the light exit surface of the third light modulation device, and the cooling efficiency of the third light modulation device can be improved.
In addition, since the air guide path includes an inclined portion, the corner portion where the air guide path and the outflow channel intersect can increase R. Thus, if the corner portion is formed in an R shape, the resistance of the cooling air at the corner portion can be reduced, and the pressure loss can be reduced. That is, the cooling air can be satisfactorily flowed out from the outflow channel to the third light modulation device without reducing the flow rate and flow velocity of the cooling air, and the cooling efficiency can be improved.

1 is a diagram schematically illustrating a schematic configuration of a projector according to an embodiment of the invention. The perspective view which shows typically the cooling device in the said embodiment, an optical apparatus, a polarization conversion element, etc. FIG. The perspective view which looked at the duct in the said embodiment from the front upper side. The perspective view seen from the front lower side of the duct in the said embodiment. The bottom view of the duct in the said embodiment. FIG. 6 is a sectional view taken along line VI-VI in FIG. 2. The VII-VII sectional view taken on the line in FIG.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.
[Projector configuration]
FIG. 1 is a diagram schematically illustrating a schematic configuration of the projector 1.
Hereinafter, in the projector 1, the projection side (side on which the projection lens 3 is disposed) is referred to as “front surface”, and the opposite side is referred to as “back surface”. Further, the front side of the drawing in FIG. Further, “left” and “right” described below correspond to the left and right when the projector 1 is viewed from the front with the top surface facing upward.
The projector 1 forms an image according to image information and projects it on a screen (not shown). As shown in FIG. 1, the projector 1 includes a substantially rectangular parallelepiped outer casing 2, a projection lens 3, an optical unit 4, a cooling device 5 that cools each component inside the projector 1, and a specific example. Although not shown in the figure, a control device or the like that controls each component in the projector 1 is provided.

The exterior housing 2 has a substantially rectangular parallelepiped shape as a whole, and is formed of a synthetic resin in this embodiment. The exterior casing 2 includes an upper case that configures the top, front, back, and side surfaces of the projector 1 and a lower case that configures the bottom, front, back, and side surfaces of the projector 1. Each case is fixed to each other with a screw or the like. In addition, the exterior housing | casing 2 may be formed with not only a synthetic resin etc. but with another material, for example, you may comprise with a metal etc.
The projection lens 3 is configured as a combined lens obtained by combining a plurality of lenses, and enlarges and projects the image light formed by the optical unit 4 on the screen.

  The optical unit 4 optically processes the light beam emitted from the light source to form image light corresponding to the image information under the control of the control device. As shown in FIG. 1, the optical unit 4 includes a light source device 41, an illumination optical device 42, a color separation optical device 43, a relay optical device 44, an optical device 45, and a light beam emitted from the light source device 41. The optical component casing 46 accommodates the optical components 41 to 45 described above at a predetermined position with respect to the illumination optical axis A set inside.

  As shown in FIG. 1, the light source device 41 includes a light source 411, a reflector 412 and the like. Then, the light source device 41 emits the light beam emitted from the light source 411 toward the illumination optical device 42 with the light emission direction aligned by the reflector 412.

  As shown in FIG. 1, the illumination optical device 42 includes a first lens array 421, a second lens array 422, a polarization conversion element 423, and a superimposing lens 424. The light beam emitted from the light source device 41 is divided into a plurality of partial light beams by the first lens array 421 and forms an image in the vicinity of the second lens array 422. Each partial light beam emitted from the second lens array 422 is incident so that its central axis (principal ray) is perpendicular to the incident surface of the polarization conversion element 423, and the polarization conversion element 423 emits approximately one type of linearly polarized light. Injected as light. A plurality of partial light beams emitted from the polarization conversion element 423 as linearly polarized light and passed through the superimposing lens 424 are superimposed on a liquid crystal panel 451 described later of the optical device 45.

As shown in FIG. 1, the color separation optical device 43 includes two dichroic mirrors 431 and 432 and a reflection mirror 433, and the dichroic mirrors 431 and 432 and the reflection mirror 433 emit the light from the illumination optical device 42. It has a function of separating a plurality of partial light beams into three color lights of red, green, and blue.
As shown in FIG. 1, the relay optical device 44 includes an incident side lens 441, a relay lens 443, and reflection mirrors 442 and 444, and the color light separated by the color separation optical device 43, for example, red light, is supplied to the optical device 45. Of the liquid crystal panel 451R on the red light side, which will be described later.

  The optical device 45 modulates an incident light beam according to image information to form image light. As shown in FIG. 1, the optical device 45 includes a liquid crystal panel 451 as three light modulation devices (a liquid crystal panel 451R as a first light modulation device on the red light side and a blue color as a second light modulation device). 451B for the light-side liquid crystal panel and 451G for the green light-side liquid crystal device as the third light modulation device), and incident-side polarization as the incident-side optical element disposed on the front side of the optical path of each liquid crystal panel 451 A plate 452, an exit-side polarizing plate 453 as an exit-side optical element disposed on the rear side of the optical path of each liquid crystal panel 451, and a cross dichroic prism 454 are provided.

The three incident-side polarizing plates 452 transmit only polarized light having substantially the same polarization direction as the polarization direction aligned by the polarization conversion element 423 among the light beams separated by the color separation optical device 43, and other light beams. The polarizing film is affixed on the translucent substrate.
The three exit-side polarizing plates 453 have substantially the same function as the incident-side polarizing plate 452 and transmit polarized light in a certain direction among the light beams emitted through the liquid crystal panel 451 and absorb other light beams. To do.

  The cross dichroic prism 454 synthesizes each color light modulated for each color light emitted from the emission side polarizing plate 453 to form a color image. The cross dichroic prism 454 has a substantially square shape in plan view in which four right-angle prisms are bonded together, and two dielectric multilayer films are formed on the interface where the right-angle prisms are bonded together. These dielectric multilayer films transmit color light emitted from the liquid crystal panel 451G and transmitted through the emission-side polarizing plate 453, and reflect each color light emitted from the liquid crystal panels 451R and 451B and transmitted through the emission-side polarizing plate 453. In this way, the color lights are combined to form image light.

[Configuration of cooling device]
FIG. 2 is a perspective view showing a main part of the present embodiment. Specifically, FIG. 2 is a perspective view of the cooling device 5 in which the optical device 45, the polarization conversion element 423, and the like are arranged as seen from the back side. is there.
The cooling device 5 blows cooling air to the liquid crystal panel 451, the incident side polarizing plate 452, the emission side polarizing plate 453, and the polarization conversion element 423. As shown in FIG. And a duct 8.

[Cooling fan configuration]
The cooling fan 7 is disposed on the right side surface of the projection lens 3 as shown in FIG. 1, and is composed of a sirocco fan as shown in FIG. Further, as shown in FIG. 2, the cooling fan 7 includes a suction port 71 for sucking air and a discharge port 72 for discharging air. The discharge port 72 of the cooling fan 7 is connected to the duct 8 as shown in FIG.
As shown in FIG. 1, an intake port 6 is provided on a side surface of the exterior housing 1, and an intake port 71 (see FIG. 2) of the cooling fan 7 is disposed so as to face the intake port 6. . Then, air outside the projector 1 is sucked into the suction port 71 (see FIG. 2) of the cooling fan 7 from the suction port 6.
As shown in FIG. 2, the cooling fan 7 sucks outside air from the air inlet 6 (see FIG. 1), and cools the liquid crystal panel 451, the incident side polarizing plate 452, the emission side polarizing plate 453, and the polarization It discharges to the conversion element 423 through the duct 8.

[Duct structure]
FIG. 3 is a perspective view of the duct 8, specifically, a perspective view of the duct 8 as seen from the upper front side. The arrows in FIG. 3 indicate the flow direction of the cooling air.
FIG. 4 is a perspective view of the duct 8, specifically, a perspective view of the duct 8 as seen from the front lower side.
FIG. 5 is a bottom view of the duct 8.
6 is a cross-sectional view taken along line VI-VI in FIG. In FIG. 6, the liquid crystal panel 451 </ b> G to be cooled is illustrated by a two-dot chain line, and the illustration of the incident side polarizing plate 452 is omitted for convenience of explanation.
7 is a cross-sectional view taken along line VII-VII in FIG.
As shown in FIG. 3, the duct 8 is formed in a substantially L shape in plan view, and has a container shape with an opening on the bottom side, as shown in FIGS. It attaches to the said bottom face part so that it may be obstruct | occluded by a bottom face part.

As shown in FIG. 3, the duct 8 extends from one end side to the back side, and then is bent in a direction substantially orthogonal to the extending direction and extends along the back side.
On the top surface side of the duct 8, as shown in FIG. 3, a green side cooling outlet 81, a red side cooling outlet 82 as an outlet, a blue side cooling outlet 83, and an outlet 84. And are formed.
As shown in FIGS. 4 and 5, first to third guide members 9 to 11 as arcuate three guide members are arranged on the bottom surface side of the duct 8 according to the shape of the duct 8. The guide members 9 to 11 start from the connection port 80 where the cooling fan 7 is connected to one end of the duct 8 and the bent portion of the duct 8, and start from the green-side cooling outlet 81 and the red-side cooling flow. It extends to the exit 82.

  As shown in FIGS. 4 and 5, the duct 8 is arranged by the first guide member 9 with respect to the L-shaped first duct portion 8A in plan view and the inside of the L-shaped portion of the first duct portion 8A. It is branched into the L-shaped second duct portion 8B in plan view, and these are integrally formed.

[Configuration of first duct section]
As shown in FIGS. 4 and 5, the first duct portion 8 </ b> A extends from one end side to the back side, and then is bent in a direction substantially orthogonal to the extending direction and extends along the back side. . The cooling air W1 discharged from the cooling fan 7 follows the first duct portion 8A in a direction along the light incident surface and the light emitting surface of the green light side liquid crystal panel 451G.
As shown in FIGS. 4 and 5, the first duct portion 8A is branched into a first flow path 8A1 and a second flow path 8A2 by the second guide member 10. A green side cooling outlet 81 is formed in the first duct portion 8A.

As shown in FIG. 4, the first flow path 8A1 and the second flow path 8A2 intersect the first air guide path 8A10 as the air guide path extending along the L-shaped portion and the first air guide path 8A10. And a second air guide path 8A20 that flows out the cooling air W1 toward the green-side cooling outlet 81.
The first air guide path 8A10 distributes the cooling air W1 discharged from the cooling fan 7 so as to be substantially parallel to the light incident surface and the light emitting surface of the liquid crystal panel 451G.
The second air guide path 8A20 causes the cooling air W1 that follows the first air guide path 8A10 to flow upward, and is guided to the green light-side liquid crystal panel 451G through the green-side cooling outlet 81.

In the following, the description will be given with reference to FIG. 6, but only the first flow path 8A1 is illustrated for the convenience of illustration, and therefore the first flow path 8A1 will be described. The description of the second flow path 8A2 is omitted, but the configuration is the same as that of the first flow path 8A1.
As shown in FIG. 6, the first duct portion 8A has a thick portion on the top surface side, and an inclined portion 85 that inclines in the vertical direction (bottom surface side) from the upstream side toward the downstream side. Is formed.
Thereby, as shown in FIG. 6, the first duct portion 8A is formed in a tapered shape so that the inner diameter of the first air guide path 8A10 is reduced. Specifically, diameter _{L 1} of the first air guiding path 8A10 is reduced in diameter toward the downstream side, diameter _{L 2,} and the first air guiding path 8A10 and the second air guide path 8A20 intersect In the corner portion, R can be increased. At this time, as shown in FIG. 6, the intersecting corner portion is formed in an R shape (curved shape).

[Configuration of second duct part]
In the second duct portion 8B, a red side cooling outlet 82, a blue side cooling outlet 83, and an outlet 84 are formed from the upstream side in the flow direction of the cooling air W2. Then, the cooling air W2 discharged from the cooling fan 7 follows the second duct portion 8B in a direction substantially orthogonal to the light incident surface and the light emitting surface of the red and blue light side liquid crystal panels 451R and 451B.
As shown in FIGS. 4 and 5, the second duct portion 8B extends from one end side to the back side as in the first duct portion 8A, and is then bent in a direction substantially orthogonal to the extending direction. It extends along the back. The second duct portion 8B includes a first flow path 8B1 as a L-shaped flow path in which the red side cooling outlet 82 and the blue side cooling outlet 83 are formed, and the first duct section 8A. A second flow path 8B2 that extends in an oblique direction toward the back side so as to intersect the end portion and has a substantially straight line shape in plan view in which an outlet 84 is formed.

[Configuration of guide member]
As described above, the first guide member 9 branches the duct 8 into the first duct portion 8A and the second duct portion 8B, and the cooling air W discharged from the cooling fan 7 as shown in FIG. The air is divided into cooling air W1 (first duct portion 8A side) and cooling air W2 (second duct portion 8B side). The first guide member 9 reduces pressure loss caused by the cooling air W2 at the bent portion of the duct 8.
Here, when the first guide member 9 is not disposed, the flow rate of the cooling air W2 decreases due to pressure loss, and the cooling air W2 is guided well to the red and blue cooling outlets 82 and 83. I can't. By disposing the first guide member 9, the first guide member 9 favorably guides the cooling air W <b> 2 to the red and blue side cooling outlets 82 and 83.

As described above, the second guide member 10 branches the first duct portion 8A into the first flow path 8A1 and the second flow path 8A2, and, as shown in FIG. The flow is divided into the first flow path 8A1 side) and the cooling air W12 (second flow path 8A2 side). The second guide member 10 reduces the pressure loss caused by the cooling air W <b> 1 at the bent portion of the duct 8.
Here, when the second guide member 10 is not disposed, the flow rate of the cooling air W1 decreases due to pressure loss, and the cooling air W1 is supplied to the second outlet 81B of the green-side cooling outlet 81, which will be described later. Cannot lead well. By disposing the second guide member 10, the second guide member 10 favorably guides the cooling air W12 to an outlet 81B described later.

As shown in FIGS. 4 and 5, the third guide member 11 branches a part of the first flow path 8B1 of the second duct portion 8B, rectifies the cooling air W2 flowing into the second duct portion 8B, and cools it. The air is divided into air W21 (on the first duct portion 8A side) and cooling air W22 (on the opposite side to the first duct portion 8A).
This 3rd guide member 11 reduces the pressure loss which arises in the 1st guide member 9 of the cooling air W2. That is, when the third guide member 11 is not disposed, the flow rate of the cooling air W2 decreases due to pressure loss, and the cooling air W2 cannot be guided well to the red-side cooling outlet 82. By disposing the third guide member 11, the third guide member 11 leads the cooling air W <b> 22 to the red side cooling outlet 82 satisfactorily.

[Configuration of outlet for cooling on the green side]
As shown in FIG. 3, the green-side cooling outlet 81 includes a rectangular first outlet 81 </ b> A and a second outlet 81 </ b> B arranged in parallel from the back side along the front-rear direction. The opening area of the first outlet 81A is formed larger than the opening area of the second outlet 81B.

  As shown in FIGS. 4 and 5, the first outlet 81A is formed in the second air guide path 8A20 of the first flow path 8A1. As shown in FIG. 3, a rectifying plate 12 that protrudes toward the top surface is disposed at the peripheral portion of the first outlet 81 </ b> A. Then, the cooling air W11 that follows the first air guide path 8A10 flows toward the bottom surface by the inclined portion 85, hits the rectifying plate 12, follows the second air guide path 8A20, and enters the incident side from the first outlet 81A. It flows out upward along the light incident surface of the polarizing plate 452 (see FIG. 2) and the liquid crystal panel 451G on the green light side (see FIGS. 2 and 6) (arrow G1 in FIGS. 3 and 6).

  As shown in FIGS. 4 and 5, the second outlet 81B is formed in the second air guide path 8A20 of the second flow path 8A2. As shown in FIG. 3, a rectifying plate 13 that protrudes toward the top surface is disposed at the peripheral portion of the second outlet 81 </ b> B. Then, the cooling air W12 that follows the first air guide path 8A10 is rectified by the second guide member 10, circulates toward the bottom surface by the inclined portion 85, hits the rectifying plate 13, and follows the second air guide path 8A20. Then, it flows out from the second outlet 81B along the upward direction to the light exit surface of the exit side polarizing plate 453 and the liquid crystal panel 451G (arrow G2 in FIG. 3).

[Configuration of outlet for cooling on the red side]
As shown in FIG. 3, the red-side cooling outlet 82 is formed extending from the right side surface along the left-right direction. As shown in FIG. 7, the incident-side polarizing plate 452, the liquid crystal panel 451R, and the exit It is formed so as to straddle the side polarizing plate 453. The red-side cooling outlet 82 is constituted by a single opening formed by combining a substantially rectangular first outlet 82A and a substantially square second outlet 82B from the right side.
As a result, the rectifying plate or the like disposed when the plurality of openings are formed is not required, and the cooling air W2 that follows the first flow path 8B1 of the second duct portion 8B may cause a pressure loss at the rectifying plate or the like. In addition, a decrease in the flow rate of the cooling air W2 is prevented.

  As shown in FIGS. 4 and 5, the first outlet 82A is formed in the first flow path 8B1 of the second duct portion 8B. The upstream edge portion of the first outlet 82 </ b> A in the flow direction of the cooling air W <b> 2 is located inside the arcuate tip portion of the third guide member 11. That is, the cooling air W22 discharged from the cooling fan 7 is rectified to the third guide member 11 and easily guided to the first outlet 82A. As a result, the cooling air W2 is rectified by the third guide member 11, and upwards on the light incident surface of the incident side polarizing plate 452 (see FIG. 2) and the red light side liquid crystal panel 451R (see FIG. 2). To flow out (arrow R1 in FIGS. 3 and 7)

  As shown in FIGS. 4 and 5, the second outlet 82B is formed in the extending direction of the first flow path 8B1 of the second duct portion 8B. As shown in FIG. 3, a rectifying plate 14 that protrudes toward the top surface is disposed at the peripheral portion of the second outlet 82 </ b> B. Thus, the cooling air W2 is rectified by the third guide member 11 and hits the rectifying plate 14 and flows out upward to the light emission surface of the liquid crystal panel 451R on the red light side and the emission side polarizing plate 453 ( Arrow R2) in FIGS.

[Configuration of the blue-side cooling outlet]
As shown in FIG. 3, the blue-side cooling outlet 83 includes a rectangular first outlet 83 </ b> A and a second outlet 83 </ b> B arranged side by side along the left-right direction.
Between the first outlet 83A and the second outlet 83B, as shown in FIGS. 4 and 5, the rectifying plate 15 is disposed so as to protrude toward the bottom surface side. As shown in FIG. 7, the rectifying plate 15 is disposed so as to block a part of the first flow path 8B1.
As shown in FIGS. 3 and 7, the rectifying plate 16 is disposed at the edge of the first outlet 83 </ b> A so as to protrude toward the top surface.

As shown in FIGS. 4 and 5, the first outlet 83A is formed in the first flow path 8B1 of the second duct portion 8B. As a result, the cooling air W2 that follows the first flow path 8B1 is rectified by the third guide member 11 and hits the rectifying plate 16 to rise on the incident-side polarizing plate 452 and the light-incident surface of the blue light-side liquid crystal panel 451B. It flows out in the direction (arrow B1 in FIGS. 3 and 7).
As shown in FIGS. 4 and 5, the second outlet 83B is formed in the first flow path 8B1 of the second duct portion 8B. As a result, the cooling air W2 that follows the first flow path 8B1 is rectified by the third guide member 11 and hits the rectifying plate 15 to rise to the light emission surface of the liquid crystal panel 451B on the blue light side and the emission side polarizing plate 453. It flows out in the direction (arrow B2 in FIGS. 3 and 7).

[Outlet configuration]
As shown in FIG. 3, the outflow port 84 is formed in a rectangular shape at the end of the second flow path 8B2 of the second duct portion 8B. As shown in FIGS. 3 and 7, a rectifying plate 17 that protrudes toward the top surface is provided at the peripheral portion of the outlet 84. Thereby, the cooling air W2 that follows the second flow path 8B2 hits the rectifying plate 17 and flows out upward from the outlet 84 to the polarization conversion element 423 (arrow P1 in FIGS. 3 and 7).

According to the projector 1 of the present embodiment described above, the following effects are obtained.
In the present embodiment, the first to third guide members 9 to 11 extend along the first flow paths 8A1 and 8B1 and the second flow path 8A2 so as to straddle the position where the first direction and the second direction intersect. Is extended. According to this, when the cooling air W is discharged into the duct 8, the first to third guide members 9 to 11 cool down the position where the first direction and the second direction of the duct 8 cross each other. The flow rate of the air W can be made uniform, and the pressure loss that occurs at the position where the first direction and the second direction of the duct 8 intersect can be reduced.
Therefore, by reducing the pressure loss, the flow rate of the cooling air W can be prevented from decreasing, and the cooling efficiency of the cooling target can be improved.

In addition, the duct 8 causes the first guide member 9 to supply the cooling air W to the green light side liquid crystal panel 451G and the red and blue light side liquid crystal panels 451R and 451B. It branches off to the second duct portion 8B that flows out. For example, since the cooling air W that follows the first duct portion 8A flows out only to the green light side liquid crystal panel 451G, the green light side liquid crystal panel 451G can be efficiently cooled.
Also, since the cooling air W that follows the second duct portion 8B flows out to the red and blue light side liquid crystal panels 451R and 451B, the red and blue light side liquid crystal panels 451R and 451B can be cooled well.

Further, the second duct portion 8B extends in a direction along the optical axis of the light flux incident on the liquid crystal panels 451R and 451B on the red and blue light sides, and the red side cooling outlet 82 of the second duct portion 8B is red. The light-side liquid crystal panel 451R, the incident-side polarizing plate 452, and the emission-side polarizing plate 453 are formed so as to extend in the direction along the optical axis of the incident light beam. According to this, the cooling air W flows out reliably to these members and can be cooled satisfactorily.
Further, the cooling air W that follows the second duct portion 8B flows out to the blue light side liquid crystal panel 451B disposed downstream of the red light side liquid crystal panel 451R, and the blue light side liquid crystal panel 451B. Can be cooled well.

Further, the first air guide path 8A10 includes an inclined portion 85 that is inclined in a direction away from the green light side liquid crystal panel 451G in the vertical direction as it goes toward the green light side liquid crystal panel 451G. Without interfering mechanically with the liquid crystal panel 451G, it is possible to secure the second air guide path 8A20 through which the cooling air W1 after passing through the first air guide path 8A10 flows toward the first air guide path 8A10.
According to this, since the cooling air W1 flows from the first air guide path 8A10 to the liquid crystal panel 451G on the green light side via the second air guide path 8A20, the cooling air W1 is green in the second air guide path 8A20. The flow in the oblique direction with respect to the opening surface of the side cooling outlet 81 is restricted, and the refrigerant flows out in a direction substantially orthogonal to the opening surface of the green side cooling outlet 81. That is, the cooling air can be made to flow uniformly over the light incident surface and the light exit surface of the green light side liquid crystal panel 451G, and the cooling efficiency of the green light side liquid crystal panel 451G can be improved.

  In addition, since the first air guide path 8A10 includes the inclined portion 85, the corner portion where the first air guide path 8A10 and the second air guide path 8A20 intersect can increase R. Thus, if the corner portion is formed in an R shape, the resistance of the cooling air W1 at the corner portion can be reduced, and the pressure loss can be reduced. That is, the cooling air W1 can be satisfactorily discharged from the second air guide path 8A20 to the liquid crystal panel 451G on the green light side without reducing the flow rate and flow velocity of the cooling air W1, and the cooling efficiency can be improved.

[Modification of Embodiment]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the above-described embodiment, the exit side polarizing plate 453 has a two-sheet configuration. However, one or three or more configurations may be used, and the incident-side polarizing plate 452 has a one-sheet configuration. It may be.
In the above embodiment, the top surface side of the duct 8 is made flat, the thick portion on the top surface side is thickened, and the first air guide path 8A10 is reduced in diameter, but the top surface side of the duct 8 is inclined. Then, the diameter of the first air guide path 8A10 may be reduced.

In the embodiment, the optical unit 4 is configured to have a substantially L shape in plan view. However, the configuration is not limited to this, and for example, a configuration having a substantially U shape in plan view may be employed.
In the above embodiment, the transmissive liquid crystal panel 451 is employed. However, the present invention is not limited to this, and a reflective liquid crystal panel may be employed, or a digital micromirror device (DMD) may be employed. . DMD is a trademark of Texas Instruments Incorporated.

  The present invention can be used for projectors used in presentations and home theaters.

  DESCRIPTION OF SYMBOLS 1 ... Projector, 5 ... Cooling device, 7 ... Cooling fan, 8 ... Duct, 8A ... 1st duct part, 8B ... 2nd duct part, 8A10 ... 1st air duct (air duct), 9 ... 1st guidance Members (guide members), 10 ... second guide member (guide member), 11 ... third guide member (guide member), 82 ... red-side cooling outlet (outlet), 85 ... inclined portion, 451 ... liquid crystal panel (Light modulation device), 451R ... red light side liquid crystal panel (first light modulation device), 451B ... blue light side liquid crystal panel (second light modulation device), 451G ... green light side liquid crystal panel (first light modulation device) 3, 452... Incident side polarizing plate (incident side optical element), 453... Exit side polarizing plate (exit side optical element).

Claims (4)

A projector including a cooling device for blowing cooling air to a cooling target,
The cooling device is
A cooling fan for sucking the cooling air;
A duct that circulates cooling air discharged from the cooling fan in a first direction and then circulates the cooling air in a second direction that intersects the first direction to guide the cooling target to a disposition position. Prepared,
In the duct,
A plurality of guide members for guiding the cooling air are disposed,
The plurality of guide members are
The projector is formed across the position where the first direction and the second direction intersect. The projector according to claim 1.
The cooling object is
First, second, and third light modulation devices that modulate three colors of light according to image information;
An incident-side optical element and an emission-side optical element disposed on the light incident side and the light emitting side of each of the light modulation devices;
The first and second light modulation devices are arranged to face each other.
The duct is
Branched to the first duct portion and the second duct portion by the guide member,
The first duct part is
Cooling air flows out into the third light modulator,
The second duct part is
Cooling air flows out to said 1st, 2nd light modulation apparatus. The projector characterized by the above-mentioned. The projector according to claim 2,
The second duct part is
Extending in the second direction along the optical axis of the luminous flux incident on the first and second light modulation devices,
The first light modulation device includes:
Disposed upstream of the second light modulator in the flow direction of the cooling air;
The outlet for flowing cooling air to the first light modulator is
In a plan view, the projector extends across the first light modulation device, the incident side optical element, and the emission side optical element. The projector according to claim 2 or 3,
The first duct part is
An air guide path for circulating cooling air in a direction along the light incident surface and the light exit surface of the third light modulation device;
The air duct is
A projector comprising an inclined portion that inclines in a direction away from the third light modulation device in a vertical direction toward the third light modulation device.

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