JP5136367B2 - Projector - Google Patents

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JP5136367B2
JP5136367B2 JP2008286678A JP2008286678A JP5136367B2 JP 5136367 B2 JP5136367 B2 JP 5136367B2 JP 2008286678 A JP2008286678 A JP 2008286678A JP 2008286678 A JP2008286678 A JP 2008286678A JP 5136367 B2 JP5136367 B2 JP 5136367B2
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sirocco fan
air
side
suction port
projector
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JP2010113218A (en
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克典 田中
伸行 大月
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セイコーエプソン株式会社
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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 according to image information to form image light, a projection optical device that enlarges and projects image light, and an exterior casing that constitutes an exterior There is known a projector equipped with
In such a projector, as a cooling structure of various optical components (cooling target) such as a light modulation device, an intake hole is formed in the outer casing, and air outside the outer casing is introduced through the intake hole. A cooling structure that blows the air to the object to be cooled is often used (see, for example, Patent Document 1).

For example, the projector described in Patent Document 1 employs a cooling structure that cools a cooling target while avoiding an increase in the size of the projector.
Specifically, in the cooling structure described in Patent Document 1, an air intake hole is formed in a side surface of the exterior housing close to the projection optical device. Then, the first sirocco fan disposed between the projection optical device and the intake hole and the second sirocco fan disposed opposite to the first sirocco fan with the projection optical device interposed therebetween are provided through the intake holes. Air outside the housing is introduced.
The second sirocco fan is used as a first sirocco fan so that air can be easily sucked into the second sirocco fan from the intake hole, that is, to prevent the air introduced from the intake hole from being blocked by the first sirocco fan. The fan is smaller than the sirocco fan.

JP 2008-242106 A

However, since the cooling structure described in Patent Document 1 employs the first sirocco fan having a small size as described above, it is difficult to ensure a sufficient amount of air blown from the first sirocco fan to the object to be cooled. There is a problem.
Therefore, there is a demand for a technology that can improve the cooling performance while avoiding an increase in the size of the projector.

  An object of the present invention is to provide a projector that can improve cooling performance while avoiding an increase in size.

  The projector according to the present invention is a projector that includes a projection optical device that is housed in an exterior housing and that projects image light in an enlarged manner, and is opposed to the projection optical device on the side wall portion along the vertical direction. A first sirocco fan, which is formed between the projection optical device and the suction hole and introduces the external air from the suction hole, and the projection; A projection direction of the projection optical device with respect to the first sirocco fan between the second sirocco fan disposed opposite to the first sirocco fan with the optical device interposed therebetween, and the projection optical device and the intake hole A connecting duct for guiding air introduced from the intake hole through the air introducing portion to the second sirocco fan, 1 sirocco fan is characterized by being composed by the size of more than the second sirocco fan.

In the present invention, since the first sirocco fan has a size larger than that of the second sirocco fan, the first sirocco fan having a size larger than that of the conventional configuration can be employed. For this reason, compared with the conventional structure, the air volume sent to the object to be cooled from the first sirocco fan can be sufficiently secured, and the cooling performance can be improved.
Further, even when the first sirocco fan is configured to be larger than the second sirocco fan, the air introduction portion is connected to the first sirocco fan in the connecting duct that guides the air introduced from the air intake hole to the second sirocco fan. The air introduced from the air intake holes is not blocked by the first sirocco fan. For this reason, air can be effectively sucked into the second sirocco fan from the air intake hole through the connecting duct, that is, a sufficient amount of air is blown from the second sirocco fan to the cooling target, and the cooling performance is improved. It can be improved.

By the way, the base end side (the side from which image light is taken in) of the projection optical device tends to be a dead space in which no member is arranged due to the layout of the optical system from the light source device to the light modulation device.
In the present invention, the air introduction portion is disposed in a dead space on the side opposite to the projection direction with respect to the first sirocco fan, that is, the base end side of the projection optical device. For this reason, even if it is a case where the air introduction part is arrange | positioned in said position, the enlargement of a projector can be avoided.
From the above, since the cooling performance can be improved while avoiding the enlargement of the projector, the object of the present invention can be achieved.

In the projector according to the aspect of the invention, the first sirocco fan has a first suction port facing the suction port and a second suction port facing the first suction port, and air is supplied from both the suction ports. The connecting duct is configured to suck, and a part of the connection duct extends toward the second suction port, and the air introduced through the air introduction unit is on the second sirocco fan side and the second suction port side. It is preferable to branch and circulate.
By the way, as a sirocco fan, a double-sided suction sirocco fan having two suction ports is easier to secure an air intake amount than a one-side suction sirocco fan having only one suction port.
In the present invention, the first sirocco fan is a double-suction sirocco fan. Further, the connecting duct guides the air introduced through the air introduction portion to the second suction port of the first sirocco fan as well as the second sirocco fan. Accordingly, for example, compared with a case where the first sirocco fan is configured as a one-side suction type sirocco fan, a sufficient amount of air can be secured without increasing the number of fan rotations. This makes it possible to reduce the noise of the projector while improving the cooling performance.

In the projector according to the aspect of the invention, the connection duct is provided with a partition plate that divides an internal space into two, and the partition plate allows air introduced through the air introduction portion to the second suction port. It is preferable to partition into a first space that circulates toward the second space and a second space that circulates toward the second sirocco fan.
In the present invention, since the partition plate is provided inside the connecting duct, the intake of air by each sirocco fan does not interfere with each other inside the connecting duct. For example, the air intake amount of the second sirocco fan does not decrease due to the influence of the air intake of the first sirocco fan. That is, since the air intake amount of both sirocco fans can be sufficiently secured, the cooling performance can be further improved.

[First embodiment]
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.
[Overview structure of the projector]
FIG. 1 is a perspective view of the projector 1 according to the first embodiment as viewed from the upper front side.
FIG. 2 is a diagram schematically showing the internal structure of the projector 1.
Note that “upper”, “lower”, “left”, and “right” described below correspond to up, down, left, and right in the drawing view of FIG. In addition, “front” and “back” described below correspond to the front and back in the drawing view of FIG.
The projector 1 modulates a light beam emitted from a light source according to image information to form image light, and enlarges and projects the formed image light on a screen (not shown). As shown in FIG. 1 or FIG. 2, the projector 1 is roughly composed of an exterior casing 2 that constitutes an exterior, an optical unit 3 (FIG. 2), and a cooling device 4 (FIG. 2).

As shown in FIG. 1 or 2, the exterior housing 2 has a substantially rectangular parallelepiped shape, and houses the optical unit 3 and the cooling device 4 therein.
In the exterior casing 2, as shown in FIG. 2, a light beam passage opening 211 for allowing the image light enlarged and projected from the optical unit 3 to pass through is formed in the front surface portion 21.
Moreover, in this exterior housing | casing 2, in the right side surface part 22 as a side wall part along a perpendicular direction, as shown in FIG. An intake hole 221 for introducing air is formed.
Here, as shown in FIG. 1, the intake hole 221 includes a rectangular first region Ar <b> 1 that circulates air to a first sirocco fan 41 that constitutes the cooling device 4, and a cooling device 4, which will be described later. The connection duct 44 has a rectangular second region Ar2 through which air flows.
Further, the first area Ar <b> 1 is configured to have approximately the same size as the outer shape of the first sirocco fan 41. The second region Ar <b> 2 is configured with a size that is substantially the same as the outer shape of an air introduction portion 45 that will be described later and that constitutes the connecting duct 44.

[Configuration of optical unit]
The optical unit 3 forms image light in accordance with image information under the control of a control device (not shown). The optical unit 3 extends from the left side to the right side along the back surface of the exterior casing 2 and further on the front side. It has a substantially L-shape in plan view that is bent and extends.
As shown in FIG. 2, the optical unit 3 includes a light source device 31 having a light source lamp 311 and a reflector 312, an illumination optical device 32 having lens arrays 321 and 322, a polarization conversion element 323, and a superimposing lens 324, and a dichroic. A color separation optical device 33 having mirrors 331 and 332 and a reflection mirror 333, a relay optical device 34 having an incident side lens 341, a relay lens 343, and reflection mirrors 342 and 344, and three liquid crystal panels as light modulation devices 351 (red light side liquid crystal panel 351R, green light side liquid crystal panel 351G, blue light side liquid crystal panel 351B), three incident side polarizing plates 352, three exit side polarizing plates 353, and color Optical device 3 having cross dichroic prism 354 as a synthetic optical device If, having an optical component housing 36, and a projection lens 37 as a projection optical device.
In the optical unit 3, the light beam emitted from the light source device 31 and passing through the illumination optical device 32 is separated into three color lights of R, G, and B by the color separation optical device 33 by the configuration described above. Each separated color light is modulated by each liquid crystal panel 351 in accordance with image information, and image light for each color light is formed. The image light for each color light is combined by a cross dichroic prism 354 and enlarged and projected by a projection lens 37 on a screen (not shown).
In addition, about each member 31-37 mentioned above, since it is utilized as an optical system of various general projectors, concrete description is abbreviate | omitted.

[Configuration of cooling device]
FIG. 3 is a perspective view of the cooling device 4 as viewed from the front upper side.
As shown in FIG. 2, the cooling device 4 is disposed in the vicinity of the projection lens 37, and cools the air introduced from the intake hole 221 by blowing it to the object to be cooled (the optical device 35 and the polarization conversion element 323). As shown in FIG. 3, the cooling device 4 includes a first sirocco fan 41, a second sirocco fan 42, an intake side duct 43, and a connecting duct 44.
In FIG. 2, for convenience of explanation, the intake side duct 43 and the connecting duct 44 are omitted as a configuration of the cooling device 4.

The first sirocco fan 41 is a so-called centrifugal fan that discharges air taken in along the fan rotation axis Ax1 (FIG. 2) along the fan rotation tangential direction.
In the present embodiment, the first sirocco fan 41 is a double-suction type in which a first suction port 411 (FIG. 2) and a second suction port 412 (FIG. 2) for sucking air are provided at positions facing each other. Consists of sirocco fans.
As shown in FIG. 2, the first sirocco fan 41 has a fan rotation axis Ax1 intersecting the projection direction of the projection lens 37 between the projection lens 37 and the intake hole 221, and the first intake port 411 is an intake hole. The discharge port 413 is disposed so as to face the rear surface side while facing the 221.
Then, in a state where the cooling device 4 is assembled and attached inside the exterior housing 2, the first sirocco fan 41 has the first suction port 411 entering the first region Ar 1 of the suction hole 221 through the suction side duct 43. opposite.

The second sirocco fan 42 is a centrifugal fan similar to the first sirocco fan 41, and has a smaller size than the first sirocco fan 41, as shown in FIG.
In the present embodiment, unlike the first sirocco fan 41, the second sirocco fan 42 is constituted by a one-side suction type sirocco fan in which an inlet 421 (FIG. 2) is provided only on one side.
Further, as shown in FIG. 2, the second sirocco fan 42 faces the first sirocco fan 41 across the projection lens 37, the fan rotation axis Ax2 intersects the projection direction of the projection lens 37, and the suction port 421. Is arranged so as to face the first sirocco fan 41 and the discharge port 423 faces the back side.
When the cooling device 4 is assembled and attached to the interior of the exterior housing 2, the second sirocco fan 42 has the suction port 421 in the second region of the intake hole 221 through the connection duct 44 and the intake side duct 43. It is substantially opposite to Ar2.

  As shown in FIG. 2 or FIG. 3, the sirocco fans 41 and 42 are arranged in an eccentric state so that the fan rotation axes Ax1 and Ax2 are shifted from each other when the cooling device 4 is assembled. Established. More specifically, the sirocco fans 41 and 42 are arranged such that the fan rotation axis Ax1 is located on the front side with respect to the fan rotation axis Ax2.

The intake-side duct 43 has a rectangular shape in plan view having substantially the same size as the intake hole 221 and is formed of a cylindrical body extending in the left-right direction. The intake side duct 43 is interposed between the intake hole 221, the first intake port 411 of the first sirocco fan 41, and an air introduction part 45 described later of the connection duct 44, and is introduced from the intake hole 221. The circulated air is circulated through the first sirocco fan 41 and the air introduction part 45.
The intake side duct 43 also has a function of holding an air filter (not shown) that captures dust mixed in the introduced air. For this reason, as shown in FIG. 3, the intake duct 43 is provided with a pair of holding portions 431 that protrude rightward and hold the air filter.

4 and 5 are diagrams showing the structure of the connecting duct 44. FIG. Specifically, FIG. 4 is a perspective view of the connecting duct 44 viewed from the upper rear side. FIG. 5 is a perspective view of the connecting duct 44 as seen from the front lower side.
The connecting duct 44 causes the air introduced from the second region Ar2 of the intake hole 221 through the intake side duct 43 to the intake port 421 of the second sirocco fan 42 and the second intake port 412 of the first sirocco fan 41. Lead. Further, the connecting duct 44 guides the air discharged from the discharge ports 413 and 423 of the sirocco fans 41 and 42 to the position to be cooled. As shown in FIGS. 3 to 5, the connection duct 44 is configured such that an air introduction part 45, a connection duct body 46, and a discharge side duct 47 are integrally formed.

The air introduction part 45 has a rectangular shape in plan view that is substantially the same as the second region Ar <b> 2 of the intake hole 221, is configured by a cylindrical body that extends in the left-right direction, and is a part that introduces air into the connection duct 44.
Further, as shown in FIGS. 3 to 5, the air introduction part 45 is provided integrally on the upper side of the discharge side duct 47 and is provided so as to communicate with the connection duct main body 46.
The air introduction part 45 is located on the back side (opposite to the projection direction) of the first sirocco fan 41 in a state where the cooling device 4 is assembled and attached inside the exterior housing 2, It arrange | positions so that 2nd area | region Ar2 may be opposed.

The connecting duct body 46 is a container-like member that is disposed on the lower side of the projection lens 37 and that opens on the lower side (FIG. 5), and follows the outer surface of the projection lens 37 from the right side to the left side of the projection lens 37. Extends and has a substantially U shape when viewed from the front side.
And the connection duct main body 46 is attached to the exterior housing | casing 2, and the opening part of the downward side is obstruct | occluded and functions as a duct.
In the connecting duct main body 46, the front portion on the right side functions as a first installation portion 461 on which the first sirocco fan 41 is installed, as shown in FIGS.
As shown in FIG. 4 or FIG. 5, the first installation portion 461 has a substantially circular shape for discharging internal air to the outside at a position facing the second suction port 412 of the first sirocco fan 41. The first outflow hole 461A is formed.
Moreover, the air introduction part 45 mentioned above is provided in the back side part of the right side in the connection duct main body 46, as shown in FIG. 3 thru | or FIG.

Further, in the connecting duct main body 46, the left side portion functions as a second installation portion 462 where the second sirocco fan 42 is installed, as shown in FIGS.
Further, as shown in FIG. 5, the second installation portion 462 has a substantially circular second outflow hole for discharging the internal air to the outside at a position facing the suction port 421 of the second sirocco fan 42. 462A is formed.

Further, as shown in FIG. 5, in the connection duct body 46, air introduced from the air introduction part 45 is introduced into the first outlet hole 461 </ b> A (the second inlet 412 of the first sirocco fan 41) and A branch plate 463 is provided that branches and flows to the second outflow hole 462A (the suction port 421 of the second sirocco fan 42).
Specifically, the branch plate 463 includes a first branch plate 4631 extending from the front-side side wall of the connection duct body 46 to the position where the air introduction unit 45 is disposed in parallel with the first installation portion 461, and the first branch plate 463. The plate 463 includes a second branch plate 4632 extending from the front end portion on the back side to the left side wall of the connection duct body 46 and has a substantially L shape.

The discharge side duct 47 is a container-like member having an opening on the lower side, and is attached to the exterior housing 2 so that the opening portion on the lower side is closed and functions as a duct. As shown in FIGS. 3 to 5, the discharge side duct 47 includes a first discharge side duct portion 471 and a second discharge side duct portion 472.
As shown in FIG. 4 or FIG. 5, the first discharge side duct portion 471 extends from the lower side of the first installation portion 461 to the back side, and further bends to the left and extends to have a substantially L shape in plan view. Have

In the first discharge side duct portion 471, a rectangular first discharge side introduction port 4711 for introducing air is formed on one end side (front side) as shown in FIG. 4 or FIG. . In the assembled state of the cooling device 4, the first discharge side introduction port 4711 is connected to the discharge port 413 of the first sirocco fan 41.
Further, in the first discharge side duct portion 471, on the upper surface on the other end side (rear side), as shown in FIG. 3 or FIG. 4, the liquid crystal panel 351R on the red light side and the liquid crystal panel 351G on the green light side Discharge side discharge ports 4712R and 4712G for discharging internal air to the outside are formed at positions corresponding to the respective arrangement positions.

As shown in FIG. 4 or FIG. 5, two second discharge side duct portions 472 are provided from the lower side of the second installation portion 462 toward the arrangement position of the optical device 35 and the arrangement position of the polarization conversion element 323. Branch to and extend.
In the second discharge side duct part 472, one end (front side) connected to the second installation part 462 has a rectangular second for introducing air into the interior, as shown in FIG. 4 or FIG. A discharge side introduction port 4721 is formed. In the assembled state of the cooling device 4, the second discharge side introduction port 4721 is connected to the discharge port 423 of the second sirocco fan 42.
Further, in the second discharge-side duct portion 472, the liquid crystal panel 351G on the green light side, the blue light side, as shown in FIG. 3 or FIG. The discharge side discharge ports 4722G (FIG. 3), 4722B (FIG. 3), and 4722P for discharging the internal air to the outside are formed at positions corresponding to the arrangement positions of the liquid crystal panel 351 and the polarization conversion element 323, respectively. Has been.

With the above configuration, the cooling device 4 cools the object to be cooled by introducing air outside the exterior housing 2 as shown below.
That is, when the first sirocco fan 41 is driven, the air outside the exterior housing 2 passes through the first region Ar1 of the intake hole 221 and the intake side duct 43 as shown by an arrow R1 in FIG. Then, the air is sucked into the first suction port 411 of the first sirocco fan 41.
Also, the air outside the exterior housing 2 is introduced into the air introduction part 45 through the second region Ar2 of the intake hole 221 and the intake side duct 43, as shown by an arrow R2 in FIGS. The As shown by an arrow R21 in FIG. 5, the air introduced into the air introduction part 45 circulates inside the connection duct body 46, a part of which is branched by the branch plate 463, and via the first outflow hole 461A, The air is sucked into the second suction port 412 of the first sirocco fan 41.

In the first sirocco fan 41, the air sucked from the respective suction ports 411 and 412 and discharged from the discharge port 413 passes through the first discharge side introduction port 4711 as shown by an arrow R3 in FIG. 4 or FIG. It is introduced into the discharge side duct portion 471 and discharged to the outside of the first discharge side duct portion 471 through the discharge side discharge ports 4712R and 4712G upward.
The air discharged to the outside of the first discharge side duct portion 471 is introduced into the optical component housing 36 through an opening (not shown) formed in the bottom surface of the optical component housing 36, and The members 351 to 353 on the red light side and the green light side are cooled.

On the other hand, when the second sirocco fan 42 is driven, the other air that circulates inside the connecting duct main body 46 as shown by the arrow R2 and is branched by the branch plate 463 is shown by the arrow R22 in FIG. As described above, the air is sucked into the suction port 421 of the second sirocco fan 42 through the second outflow hole 462A.
In the second sirocco fan 42, the air sucked from the suction port 421 and discharged from the discharge port 423 passes through the second discharge side introduction port 4721 as shown by the arrow R4 in FIG. It is introduced into the section 472 and discharged to the outside of the second discharge side duct section 472 upward via the discharge side discharge ports 4722G, 4722B, 4722P.
Then, the air discharged to the outside of the second discharge side duct portion 472 is introduced into the optical component casing 36 through an opening (not shown) formed in the bottom surface of the optical component casing 36, and is supplied to the optical device 35. The green light side and blue light side members 351 to 353 and the polarization conversion element 323 are cooled.

The first embodiment described above has the following effects.
In the present embodiment, since the first sirocco fan 41 is a sirocco fan having a size larger than that of the second sirocco fan 42, the first sirocco fan 41 having a size larger than that of the conventional configuration can be employed. For this reason, compared with the conventional structure, the air volume blown from the first sirocco fan 41 to the cooling target (optical device 35) can be sufficiently secured, and the cooling performance can be improved.

  Further, even when the first sirocco fan 41 is a sirocco fan having a size larger than that of the second sirocco fan 42, the air introduction portion 45 is provided on the back side of the first sirocco fan 41 in the connection duct 44. Therefore, the air introduced from the intake hole 221 is not blocked by the first sirocco fan 41. For this reason, air can be effectively sucked into the second sirocco fan 42 from the intake hole 221 via the connecting duct 44, that is, the cooling target (the optical device 35, the polarization conversion element 323) from the second sirocco fan 42. A sufficient amount of air can be secured to improve the cooling performance.

  Further, the air introduction portion 45 is disposed in the dead space Ds (FIG. 2) that is the back side of the first sirocco fan 41, that is, the base end side of the projection lens 37 (the back side of the reflection mirror 344). For this reason, even if it is a case where the air introduction part 45 is arrange | positioned in said position, the enlargement of the projector 1 can be avoided.

  Furthermore, the first sirocco fan 41 is constituted by a sirocco fan of both-side suction type. The connection duct 44 guides the air introduced through the air introduction part 45 to the second inlet 412 of the first sirocco fan 41 in addition to the second sirocco fan 42. Accordingly, for example, compared with a case where the first sirocco fan is configured as a one-side suction type sirocco fan, a sufficient amount of air can be secured without increasing the number of fan rotations. The noise of the projector 1 can be reduced while improving the cooling performance.

  Here, since the second branch plate 4632 extending from the position where the air introduction part 45 is disposed to the vicinity of the second outflow hole 462A is provided inside the connection duct body 46, The space through which air is circulated toward the two sirocco fans 42 can be reduced, and the retention of air inside the connecting duct body 46 can be suppressed. For this reason, the air introduced through the air introduction part 45 can be effectively inhaled by the second sirocco fan 42.

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In the following description, the same structure and the same members as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted or simplified.
6 and 7 are views showing the structure of the connecting duct 44 in the second embodiment. Specifically, FIG. 6 is a perspective view of the connecting duct 44 viewed from the upper rear side. FIG. 7 is a perspective view of the connecting duct 44 as viewed from the front lower side.
This embodiment is different from the first embodiment only in that a partition plate 48 is provided in the connection duct 44 as shown in FIG. 6 or FIG.
Other configurations are the same as those in the first embodiment.

Specifically, as shown in FIG. 6 or FIG. 7, the partition plate 48 extends from the air introduction side in the air introduction portion 45 toward the inside of the connection duct body 46, and the first branch plate in the branch plate 463. 4631 and the second branch plate 4632 are connected to each other. That is, the partition plate 48 has a function of partitioning the flow path that circulates to the suction port 421 of the second sirocco fan 42 and the flow path that circulates to the second suction port 412 of the first sirocco fan 41 in the connection duct 44. Have.
With the above configuration, air circulates inside the connecting duct 44 as shown below.
That is, a part of the air introduced into the connection duct 44 (air introduction part 45) is caused by the partition plate 48 and the first branch plate 4631 inside the connection duct 44 as shown by an arrow R2A in FIG. 6 or FIG. It flows through the partitioned first space Sp1, and is sucked into the second suction port 412 of the first sirocco fan 41 through the first outflow hole 461A.
Further, a part of the air introduced into the connection duct 44 (air introduction part 45) is divided by the partition plate 48 and the second branch plate 4632 inside the connection duct 44 as shown by an arrow R2B in FIG. 6 or FIG. It flows through the partitioned second space Sp2, and is sucked into the suction port 421 of the second sirocco fan 42 through the second outflow hole 462A.

The second embodiment described above has the following effects in addition to the same effects as those of the first embodiment.
In the present embodiment, since the partition plate 48 is provided inside the connection duct 44, the intake of air by the sirocco fans 41 and 42 does not interfere with each other inside the connection duct 44. For example, the air intake amount of the second sirocco fan 42 does not decrease due to the influence of the air intake of the first sirocco fan 41. That is, since the air intake amount of both the sirocco fans 41 and 42 can be sufficiently secured, the cooling performance can be further improved.

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 first sirocco fan 41 is a sirocco fan having a size larger than that of the second sirocco fan. However, the first sirocco fan 41 is not limited to this. I do not care.
In the above-described embodiment, the polarization conversion element 323, each liquid crystal panel 351, each incident-side polarizing plate 352, and each emission-side polarizing plate 353 are employed as the cooling target of the cooling device 4. You may employ | adopt other structural members, such as an apparatus, a control apparatus, or the light source device 31. FIG.

In the above embodiment, only an example of a front type projector that projects from the direction of observing the screen has been described, but the present invention is also applicable to a rear type projector that projects from the side opposite to the direction of observing the screen. Is possible.
In the embodiment, a transmissive liquid crystal panel having a different light incident surface and light emitting surface is used. However, a reflective liquid crystal panel having the same light incident surface and light emitting surface may be used.
In the embodiment, the liquid crystal panel is used as the light modulation device. However, a light modulation device other than liquid crystal, such as a device using a micromirror, may be used.

  Since the projector of the present invention can improve the cooling performance while avoiding an increase in size, it can be used as a projector used in presentations and home theaters.

The perspective view which looked at the projector in a 1st embodiment from the front upper part side. The figure which shows typically the internal structure of the projector in the said embodiment. The perspective view which looked at the cooling device in the said embodiment from the front upper side. The figure which shows the structure of the connection duct in the said embodiment. The figure which shows the structure of the connection duct in the said embodiment. The figure which shows the structure of the connection duct in 2nd Embodiment. The figure which shows the structure of the connection duct in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Exterior housing | casing, 22 ... Right side surface part (side wall part), 37 ... Projection lens (projection optical apparatus), 41 ... 1st sirocco fan, 42 ... Second sirocco fan, 44... Connecting duct, 45... Air introduction section, 48... Partition plate, 221. Mouth, Sp1 ... first space, Sp2 ... second space.

Claims (3)

  1. A projector including a projection optical device that is housed in an exterior housing and projects image light in an enlarged manner,
    In the outer casing, an intake hole for introducing external air is formed at a position facing the projection optical device in the side wall portion along the vertical direction,
    A first sirocco fan that is disposed between the projection optical device and the intake hole and introduces external air from the intake hole, and is disposed to face the first sirocco fan across the projection optical device. With the second Sirocco fan
    Between the projection optical device and the intake hole, there is an air introduction portion disposed on the opposite side of the projection direction of the projection optical device with respect to the first sirocco fan, and the air introduction portion is disposed from the intake hole. A connecting duct for guiding the air introduced through the second sirocco fan,
    The first sirocco fan is
    A projector having a size larger than that of the second sirocco fan.
  2. The projector according to claim 1, wherein
    The first sirocco fan is
    Having a first suction port facing the suction port and a second suction port facing the first suction port, configured to suck air from both of the suction ports;
    The connecting duct is
    A part of the projector extends toward the second suction port, and the air introduced through the air introduction part is branched and circulated to the second sirocco fan side and the second suction port side. .
  3. The projector according to claim 2,
    In the connecting duct,
    A partition plate that divides the internal space into two parts is provided,
    The partition plate is
    The projector is divided into a first space in which air introduced through the air introduction part is circulated toward the second suction port and a second space in which the air is circulated toward the second sirocco fan. .
JP2008286678A 2008-11-07 2008-11-07 Projector Active JP5136367B2 (en)

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