JP5092489B2 - projector - Google Patents

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, a projection optical device that enlarges and projects a light beam modulated by the light modulation device, a light source device, and a light modulation device And a projector having an exterior housing that houses and arranges the projection optical device therein.
In such a projector, as a cooling structure for various optical components such as a light modulation device, an air inlet is formed in the outer housing, air outside the outer housing is taken into the inside through the air inlet, and the air taken in A cooling structure for cooling various optical components is frequently used (see, for example, Patent Document 1).
In the cooling structure described in Patent Document 1, one sirocco fan is disposed so as to face the air intake port, and the air outside the exterior casing is taken into the inside through the air intake port by driving the one sirocco fan. Yes.

JP 2006-72037 A

By the way, in order to efficiently cool various optical components inside the outer casing, it is necessary to suck air outside the outer casing with a predetermined intake amount through the air inlet and blow it to the various optical components.
The projector described in Patent Document 1 is configured to take in air outside the outer casing through a suction port using a single sirocco fan, so that various optical components inside the outer casing can be efficiently cooled. It is necessary for one sirocco fan to suck air outside the outer casing with the predetermined suction amount. That is, it is necessary to use a large sirocco fan with high suction power. Therefore, a space for disposing a large sirocco fan inside the exterior casing is required, that is, the exterior casing needs to be formed large in the thickness direction, and there is a problem that the projector cannot be miniaturized. .

  An object of the present invention is to provide a projector that can be miniaturized.

The projector of the present invention includes a light source device, a light modulation device that modulates a light beam emitted from the light source device according to image information, a projection optical device that enlarges and projects the light beam modulated by the light modulation device, A projector including an exterior housing that houses the light source device, the light modulation device, and the projection optical device; and when the projector is installed in a predetermined posture in the exterior housing An air inlet for introducing outside air is formed at a position facing the projection optical device on the side surface along the vertical direction so that the rotation axis of the fan intersects with the projection direction of the projection optical device. A first sirocco fan and a second sirocco fan, which are arranged opposite to each other with the projection optical device interposed therebetween and introduce external air into the inside through the intake port, are provided. Kkofan has a shape larger than the first sirocco fan, the first sirocco fan is disposed between the projection optical system and the air inlet, the first sirocco fan and the second sirocco fan Are arranged at positions where the respective fan rotation shafts are displaced from each other, and are arranged between the first sirocco fan and the intake port, and air introduced into the exterior casing through the intake port. An intake-side duct that divides and circulates to the first sirocco fan side and the projection optical apparatus side, and the intake-side duct faces the suction surface of the first sirocco fan and causes internal air to flow inside the first sirocco fan. An intake-side duct body that circulates to the side, and an extending portion that faces the outer periphery along the fan rotation axis of the first sirocco fan and circulates internal air to the projection optical apparatus side The intake duct main body and the extension part are integrally formed to have an L shape in plan view, and the surface of the intake duct facing the intake port is interposed via the intake port. An intake side introduction port for introducing air introduced into the exterior casing into the intake side duct is formed, and the intake side introduction port is formed on the intake side as viewed from the direction along the fan rotation axis. It is formed so as to overlap both the inside of the duct main body and the inside of the extending portion .

  In the present invention, the projector includes two fans, a first sirocco fan and a second sirocco fan that take in air outside the exterior housing through the air inlet. As a result, it is only necessary to supplement the predetermined amount of suction required for efficiently cooling various optical components such as the light modulation device inside the outer casing with the two fans. Compared with the sirocco fan, it can be configured with a small fan with low suction power. Accordingly, the two fans can maintain the predetermined suction amount to efficiently cool various optical components inside the outer casing, and the two casings can be downsized to make the outer casing larger in the thickness direction. There is no need to reduce the size of the projector.

By the way, when the two sirocco fans are configured in the same shape (same size), the following problems are likely to occur.
In other words, since the first sirocco fan is disposed between the projection optical device and the air inlet, it is easy to inhale air outside the outer casing through the air inlet.
On the other hand, the second sirocco fan faces the first sirocco fan with the projection optical device interposed therebetween. For this reason, the air which goes to a 2nd sirocco fan via an inlet port is obstruct | occluded by the 1st sirocco fan, and becomes difficult to be inhaled by the 2nd sirocco fan.
Therefore, the intake port is formed to be relatively large. The first sirocco fan and the second sirocco fan are shifted in the projection direction so that at least a part of the second sirocco fan is located outside the first sirocco fan when viewed from the intake side. It is conceivable to prevent the air traveling toward the second sirocco fan from being blocked by the first sirocco fan through the intake port. However, when arranged in this way, it is necessary to make the exterior housing larger in the projection direction by the amount of the first sirocco fan and the second sirocco fan arranged in the projection direction. Inhibits.

  In the present invention, the second sirocco fan has a larger shape (size) than the first sirocco fan. The smaller first sirocco fan is disposed between the projection optical device and the air inlet. As a result, even if the first sirocco fan and the second sirocco fan are not arranged to be shifted in the projection direction, a part of the second sirocco fan is located outside the first sirocco fan when viewed from the intake port side. Will be. For this reason, the air which goes to a 2nd sirocco fan via an inlet port passes the outer side of a 1st sirocco fan along a fan rotating shaft, and can implement | achieve the structure which is easy to be suck | inhaled with a 2nd sirocco fan. Therefore, it is not necessary to dispose the first sirocco fan and the second sirocco fan in the projection direction, and the projector can be miniaturized without forming an outer casing large in the projection direction.

And in time, when the first sirocco fan and the second sirocco fan the fan rotation axis is disposed so as to be positioned on the same axis is in manufacturing the intake duct, prone to the following problems.
In other words, the shape of the intake side duct is such that the second sirocco fan allows the air outside the outer casing to be effectively sucked through the intake port by sandwiching the suction surface of the first sirocco fan and the fan rotation shaft. It is necessary to form so that it may have a U-shape in planar view surrounding each outer peripheral surface which mutually opposes. When manufacturing an intake side duct having such a shape, a mold used for molding the intake side duct has a complicated shape. This makes it difficult to manufacture the intake side duct and increases the manufacturing cost of the intake side duct.

  In the present invention, the first sirocco fan and the second sirocco fan are disposed at positions where the respective fan rotation shafts are shifted from each other. As a result, when viewed from the intake port side, the second sirocco fan part (hereinafter referred to as a shift part) located outside the first sirocco fan is moved away from the fan rotation shaft of the first sirocco fan. They can be collectively positioned at a predetermined position in the direction of deviation of the fan rotation axis. In addition, the intake duct has an L-shape in plan view that surrounds the suction surface of the first sirocco fan and the outer periphery along the fan rotation axis. As a result, if one end side of the L-shape located on the outer peripheral side of the first sirocco fan in the intake side duct is disposed so as to oppose the shift portion of the second sirocco fan, projection is performed via the intake side duct. The air circulated to the optical device side can be effectively sucked by the second sirocco fan. Accordingly, the intake side duct having a simple shape can be manufactured easily and the manufacturing cost can be reduced, and the second sirocco fan can effectively suck the air outside the outer casing through the intake port. it can.

In the projector according to the aspect of the invention, the intake-side duct may include a first intake-side exhaust port for exhausting internal air to the first sirocco fan side, and a first intake for exhausting internal air to the projection optical device side. The air intake side duct has a partition portion that divides into a region including the first air intake side exhaust port and a region including the second air intake side exhaust port. It is preferable.
By the way, in the configuration in which the above-described partition portion is not provided inside the intake side duct, the following problems are likely to occur.
As drive control of the first sirocco fan and the second sirocco fan, for example, when control for increasing the rotation speed of the first sirocco fan is performed, the air flowing toward the first intake side exhaust port in the intake side duct is controlled. The flow rate increases, and conversely, the air flow rate toward the second intake side discharge port decreases. That is, depending on the control state of the first sirocco fan and the second sirocco fan, each flow rate of air discharged through the first intake side exhaust port and the second intake side exhaust port is affected.
In the present invention, a partition portion is provided inside the intake side duct to partition into a region including the first intake side discharge port and a region including the second intake side discharge port. As a result, the air flow path toward the first intake side exhaust port and the air flow path toward the second intake side discharge port can be made independent of each other, and control of the first sirocco fan and the second sirocco fan is achieved. Even depending on the state, each flow rate of the air discharged through the first intake side exhaust port and the second intake side exhaust port is not affected.

In the projector according to the aspect of the invention, the projection extends from the first sirocco fan side to the second sirocco fan side along the outer surface along the projection direction of the projection optical device, and is distributed to the projection optical side through the intake duct. A connection duct for guiding the air to the second sirocco fan, the connection duct facing the first sirocco fan, and a fan support part for attaching the first sirocco fan, the fan support part, It is preferable that the connecting duct is formed in a hollow shape having a communication chamber that communicates with an air flow path toward the second sirocco fan.
In the present invention, since the projector includes the connecting duct, the air circulated to the projection optical device side through the intake side duct can be guided to the second sirocco fan by the connecting duct. Thus, the air outside the exterior housing can be effectively sucked through the intake port.

  In addition to the function of supporting the first sirocco fan, the fan support portion constituting the connection duct has a communication chamber that communicates with the air flow passage toward the second sirocco fan in the connection duct, and also has a function as a duct. . As a result, compared to a configuration in which no communication chamber is provided in the fan support portion, for example, the volume inside the connection duct can be set larger, and noise due to air flowing inside the connection duct is reduced when the second sirocco fan is driven. And the quietness of the projector can be secured.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a schematic configuration of the projector 1. Specifically, FIG. 1 is a perspective view in which the upper case 5 is removed from the projector 1. In FIG. 1, for convenience of explanation, the projection direction of a color image is a Z axis, and two axes orthogonal to the Z axis are an X axis (horizontal axis) and a Y axis (vertical axis). The same applies to the following drawings.
The projector 1 modulates a light beam emitted from a light source according to image information to form image light (color image), and enlarges and projects the formed color image on a screen (not shown). As shown in FIG. 1, the projector 1 is configured integrally with a projector main body 2 and a DVD (Digital Versatile Disk) player 3 as an image reproducing device that are vertically partitioned by a partition plate 4. is there.

As shown in FIG. 1, the DVD player 3 is disposed on the lower side of the partition plate 4, and includes a lower case 31 that constitutes a bottom surface portion (−Y-axis direction side) of the projector 1, a lower case 31, and the partition plate 4. And a player main body (not shown) disposed in the space constituted by.
The player body reads image information (digital video signal) recorded on a DVD inserted in a DVD insertion unit 311 provided on the + Z-axis direction end surface of the lower case 31 and outputs the read image information to the projector body 2. To do.

As shown in FIG. 1, the projector main body 2 includes an upper case 5 (see FIG. 2) as an exterior housing, an optical unit 6, a cooling device 7, and the like.
Although not shown in FIG. 1, in the space formed by the upper case 5 and the partition plate 4, power is supplied to each component member inside the projector 1 in addition to the optical unit 6 and the cooling device 7. A power supply unit to be supplied and a control device for controlling each component in the projector 1 are arranged.

FIG. 2 is a perspective view schematically showing a part of the upper case 5.
The upper case 5 constitutes the top surface portion (+ Y-axis direction side) of the projector 1, and is combined with the partition plate 4, so that the optical unit 6 is formed in the space formed by the upper case 5 and the partition plate 4. In addition, a cooling device 7 and the like are arranged.
In the upper case 5, a light beam passage opening 51 for allowing a color image enlarged and projected from the optical unit 6 to pass through is formed on the end surface in the + Z-axis direction, as shown in FIG.
Further, in the upper case 5, an end surface in the + X-axis direction (a side surface portion along the vertical direction (Y-axis direction when the projector 1 is installed in a predetermined posture)), as shown in FIG. An air inlet 52 for introducing air outside the upper case 5 into the interior by driving of the cooling device 7 is formed at a position facing the projection lens (described later) of the optical unit 6 on the direction side.

FIG. 3 is a diagram schematically showing the configuration of the optical unit 6.
The optical unit 6 optically processes the light beam emitted from the light source under the control of the control device, forms a color image corresponding to the image information, and enlarges and projects it on the screen. As shown in FIG. 3, the optical unit 6 includes a light source device 61 having a light source lamp 611, a reflector 612, and the like, and an illumination optical device 62 having lens arrays 621, 622, a polarization conversion element 623, a superimposing lens 624, and the like. The color separation optical device 63 having the dichroic mirrors 631, 632, the reflection mirror 633, etc., the relay optical device 64 having the incident side lens 641, the relay lens 642, the reflection mirrors 643, 644, etc., and the control by the control device The three liquid crystal panels 651 as light modulation devices for modulating the light beam emitted from the light source device 61 according to image information (the red light side is the liquid crystal panel 651R, the green light side is the liquid crystal panel 651G, and the blue light side is Liquid crystal panel 651B), three incident side polarizing plates 652, three outgoing side polarizing plates 653 And an optical device 65 having a cross dichroic prism 654 as a color synthesizing optical device for synthesizing light beams modulated by three liquid crystal panels 651 to form a color image, and a projection optical device for enlarging and projecting a color image. A projection lens 66 and an optical component casing 67 that arranges these optical components 61 to 66 at predetermined positions with respect to the illumination optical axis A set therein are provided.
Note that the optical components 61 to 66 described above are used as various general projector optical systems, and thus will not be described in detail.

4 and 5 are diagrams showing the structure of the cooling device 7. Specifically, FIG. 4 is a perspective view showing a state in which the cooling device 7 is integrated. FIG. 5 is an exploded perspective view of the cooling device 7.
As shown in FIG. 1, the cooling device 7 is disposed in the vicinity of the projection lens 66, and air introduced into the upper case 5 through the air inlet 52 is an object to be cooled (the optical device 65, the polarization conversion element 623, etc.). ) To cool. As shown in FIG. 4 or FIG. 5, the cooling device 7 includes a first sirocco fan 71, a second sirocco fan 72, an intake side duct 73, and a connecting duct 74.

The first sirocco fan 71 is a so-called centrifugal fan that discharges air taken in along the fan rotation axis Ax1 (FIG. 5) along the fan rotation tangential direction. As shown in FIG. 1, the first sirocco fan 71 is disposed on the + X-axis direction side of the projection lens 66 (between the projection lens 66 and the air inlet 52) so that the fan rotation axis Ax1 is along the X-axis. ing.
The second sirocco fan 72 is a centrifugal fan similar to the first sirocco fan 71 and has a larger size than the first sirocco fan 71 as shown in FIG. 4 or FIG. As shown in FIG. 1, the second sirocco fan 72 is opposed to the first sirocco fan 71 with the projection lens 66 interposed therebetween, and the fan rotation axis Ax2 (FIG. 5) is disposed along the X axis. .
Then, as shown in FIG. 5, the first sirocco fan 71 and the second sirocco fan 72 are in an eccentric state so that the fan rotation shafts Ax1 and Ax2 are shifted from each other when the cooling device 7 is assembled. Arranged. More specifically, as shown in FIG. 5, the first sirocco fan 71 and the second sirocco fan 72 are arranged such that the fan rotation axis Ax1 is located on the −Z axis direction side with respect to the fan rotation axis Ax2. Has been. The first sirocco fan 71 is disposed at a position hidden from the second sirocco fan 72 when viewed from the −X-axis direction side.

6 and 7 are perspective views showing the structure of the intake side duct 73. FIG. Specifically, FIG. 6 is a perspective view of the intake duct 73 as viewed from the + X axis direction side. FIG. 7 is a perspective view of the intake side duct 73 as seen from the −X axis direction side.
As shown in FIG. 4 or 5, the intake side duct 73 is disposed on the + X axis direction side of the first sirocco fan 71 (between the first sirocco fan 71 and the intake port 52). The intake side duct 73 has an L shape in plan view (when viewed along the Y axis direction) surrounding the suction surface 711 (FIG. 5) of the first sirocco fan 71 and the outer periphery on the + Z axis direction side, The air introduced into the upper case 5 through the air inlet 52 is divided and distributed to the first sirocco fan 71 side and the projection lens 66 side.

As shown in FIG. 6 or FIG. 7, the intake side duct 73 is configured such that an intake side duct body 731 and an extending portion 732 are integrally formed.
As shown in FIG. 6 or FIG. 7, the intake-side duct body 731 is configured by a substantially rectangular parallelepiped hollow member.
In the intake side duct body 731, a rectangular intake side introduction port 7311 for introducing air into the interior is formed on the end surface in the + X-axis direction, as shown in FIG. 6. Further, as shown in FIG. 4 or FIG. 5, a dust removal filter 7311A for removing dust mixed in the air is fitted and fixed to the intake side introduction port 7311. In the assembled state of the projector 1, the intake side introduction port 7311 is connected to the intake port 52, and the air outside the upper case 5 passes through the intake side 52, the intake side introduction port 7311, and the dust removal filter 7311 </ b> A. It is introduced into the duct 73.

  Further, in the intake-side duct main body 731, as shown in FIG. 6 or 7, a substantially circular first intake air for exhausting a part of the air introduced into the outside is provided on the end surface in the −X-axis direction. A side discharge port 7312 is formed. As shown in FIG. 6 or FIG. 7, the first intake-side discharge port 7312 has a circular center position shifted to the −Z-axis direction side with respect to the center position of the −X-axis direction end surface of the intake-side duct body 731. It is formed in the position. Further, as shown in FIG. 6 or FIG. 7, the first intake side discharge port 7312 is formed with a lattice portion 7312 </ b> A that extends from the edge toward the center. In the assembled state of the cooling device 7, the first intake side exhaust port 7312 is connected to the intake surface 711 of the first sirocco fan 71, and a part of the air inside the intake side duct body 731 is connected to the first intake side exhaust port. The air is sucked into the first sirocco fan 71 through 7312.

As shown in FIG. 6 or FIG. 7, the extending portion 732 extends from the portion on the + Z-axis direction side of the −X-axis direction end surface of the intake-side duct body 731 to the −X-axis direction side, It is comprised by the substantially rectangular parallelepiped hollow member connected.
In the extending portion 732, as shown in FIG. 7, the distal end portion in the extending direction has a rectangular second intake side for discharging a part of the air introduced into the intake side duct body 731 to the outside. A discharge port 7321 is formed. The second intake-side discharge port 7321 is disposed so as to face the projection lens 66 in a state where the projector 1 is assembled, and the intake-side duct led to the −X-axis direction side via the extending portion 732. Part of the air inside the main body 731 is discharged to the projection lens 66 side.

  In the intake side duct body 731, the inner surface of the end surface in the −X-axis direction has an inside of the intake side duct 73, as shown in FIG. 6, a first region Ar 1 including the first intake side exhaust port 7312, and a second region. A partition portion 7313 that divides into a second region Ar2 including the intake side discharge port 7321 is provided.

8 and 9 are perspective views showing the structure of the connecting duct 74. FIG. Specifically, FIG. 8 is a perspective view of the connecting duct 74 viewed from the + Y-axis direction side. FIG. 9 is a perspective view of the connecting duct 74 viewed from the −Y axis direction side.
As shown in FIG. 1, the connecting duct 74 is disposed on the −Y axis direction side of the optical unit 6. The connecting duct 74 guides the air guided to the projection lens 66 side by the extending portion 732 of the intake side duct 73 to the position where the second sirocco fan 72 is disposed, and the first sirocco fan 71 and the second sirocco fan. The air discharged from 72 is guided to the position to be cooled. As shown in FIG. 8 or FIG. 9, the connection duct 74 is configured such that a connection duct main body 75 and a discharge side duct 76 are integrally formed.

The connecting duct body 75 is a container-like member having an opening on the −Y axis direction side, and is placed on the partition plate 4 so that the opening portion on the −Y axis direction side is closed and air is circulated therein. As shown in FIG. 8 or FIG. 9, the connecting duct body 75 includes a first opposing wall portion 751, a connecting portion 752, and a second opposing wall portion 753, and is substantially U when viewed from the Z-axis direction. It has a letter shape.
The first opposing wall portion 751 is located between the first sirocco fan 71 and the projection lens 66, and faces the first sirocco fan 71 and the distal end portion in the extending direction of the extending portion 732 constituting the intake side duct 73. It has a substantially rectangular parallelepiped shape.
As shown in FIG. 8 or FIG. 9, in the first opposing wall 751, on the + Z-axis direction side of the end surface in the + X-axis direction, there is air inside at a position facing the distal end portion in the extending direction of the extending portion 732. A rectangular connection side introduction port 7511 is formed for introducing. In the assembled state of the cooling device 7, the connection side introduction port 7511 is connected to the second intake side discharge port 7321, and the air guided to the projection lens 66 side by the extending portion 732 of the intake side duct 73 is the first. 2 It is introduced into the connection duct body 75 through the intake side discharge port 7321 and the connection side introduction port 7511.

Here, in the first opposing wall 751, the −Z-axis direction side of the connection side introduction port 7511 has a substantially rectangular plane facing the first sirocco fan 71, as shown in FIG. It functions as a fan support 7512 for attaching the sirocco fan 71.
More specifically, as shown in FIG. 8, the fan support portion 7512 has fixing holes 7512 </ b> A for attaching the first sirocco fan 71 at diagonal positions on the rectangular plane. Then, screws (not shown) are screwed into the fixing holes 7512A through the fixing holes 73A (FIGS. 5 to 7) of the intake side duct 73 and the fixing holes 71A (FIG. 5) of the first sirocco fan 71. Thus, the first sirocco fan 71 and the intake-side duct 73 are fixed to the connecting duct main body 75 in a state of being stacked in the X-axis direction (FIG. 4).
Further, as shown in FIG. 9, the fan support portion 7512 is formed in a hollow shape having a communication chamber R that communicates with the air flow passage C from the connection side introduction port 7511 in the connection duct body 75 toward the second sirocco fan 72. Has been.
As shown in FIG. 8 or FIG. 9, the connecting portion 752 is a portion that connects the first opposing wall portion 751 and the second opposing wall portion 753, and extends along the outer surface of the projection lens 66. Then, the air introduced into the first opposing wall portion 751 is guided to the second opposing wall portion 753.

The second facing wall 753 is located between the second sirocco fan 72 and the projection lens 66 and has a substantially rectangular parallelepiped shape facing the second sirocco fan 72.
In the second facing wall 753, a substantially circular connection side discharge port 7531 for discharging the air introduced into the outside is formed on the end surface in the −X-axis direction as shown in FIG. Yes. In the assembled state of the cooling device 7, the connection side discharge port 7531 is connected to the suction surface 721 (FIG. 5) of the second sirocco fan 72, and the air inside the connection duct body 741 passes through the connection side discharge port 7531. Inhaled by the second sirocco fan 72.

The discharge side duct 76 is a container-like member having an opening on the −Y axis direction side, and is placed on the partition plate 4 so that the opening portion on the −Y axis direction side is closed and air is circulated therein. As shown in FIG. 8 or FIG. 9, the discharge side duct 76 includes a first discharge side duct portion 761 and a second discharge side duct portion 762.
As shown in FIG. 8 or FIG. 9, the first discharge-side duct portion 761 is connected to the −Z-axis direction end portion of the first opposing wall portion 751 of the connecting duct body 75, and from the −Z-axis direction end portion. It has a substantially L-shape that extends in the Z-axis direction and further bends and extends in the −X-axis direction (when viewed from the Y-axis direction).

  In the first discharge-side duct portion 761, a rectangular shape for introducing air into the inside as shown in FIG. 8 or 9 is provided on one end side (the end portion on the + Z-axis direction side) of the L shape in plan view. The first discharge side introduction port 7611 is formed. And in the state which assembled the cooling device 7, the 1st discharge side introduction port 7611 is connected to the discharge port 712 (FIG. 5) of the 1st sirocco fan 71, and the air discharged from the 1st sirocco fan 71 is the 1st discharge. It is introduced into the first discharge side duct portion 761 through the side introduction port 7611.

  Further, in the first discharge-side duct portion 761, the red light side liquid crystal panel 651 </ b> R and the green light side liquid crystal panel are disposed on the + Y-axis direction end surface on the other end side in an L shape in plan view, as shown in FIG. 8. Discharge side discharge ports 7612R and 7612G for discharging the internal air to the outside are formed at positions corresponding to the respective arrangement positions of 651G. When the projector 1 is assembled, the air discharged from the first sirocco fan 71 flows through the first discharge side duct portion 761, and the current plate 7613 inside the first discharge side duct portion 761 (FIG. 9). And are discharged to the red light side and the green light side of the optical device 65 through the discharge side discharge ports 7612R and 7612G. The discharged air circulates along the liquid crystal panel 651R and the polarizing plates 652 and 653 on the red light side, and the liquid crystal panel 651G and the polarizing plates 652 and 653 on the green light side, and the optical components 651R, 651G, and 652, respectively. 653 is cooled.

As shown in FIG. 8 or FIG. 9, the second discharge-side duct portion 762 is connected to the −Z-axis direction end portion of the second opposing wall portion 753 of the connecting duct main body 75, and polarized from the −Z-axis direction end portion. Branching and extending to the blue light side of the arrangement position of the conversion element 623 and the optical device 65.
In the second discharge side duct portion 762, a rectangular second discharge side introduction for introducing air into the inside is provided on one end side connected to the second opposing wall portion 753 as shown in FIG. 8 or FIG. A mouth 7621 is formed. In the assembled state of the cooling device 7, the second discharge side introduction port 7621 is connected to the discharge port 722 (FIG. 5) of the second sirocco fan 72, and the air discharged from the second sirocco fan 72 is discharged from the second sirocco fan 72. It is introduced into the second discharge side duct portion 762 through the side introduction port 7621.

  Further, in the second discharge side duct portion 762, on the + Y-axis direction end face on each other end side branched into two, as shown in FIG. 8, the polarization conversion element 623 and the blue light side liquid crystal panel 651B are provided. Discharge side discharge ports 7622P and 7622B for discharging internal air to the outside are formed at positions corresponding to the respective arrangement positions. When the projector 1 is assembled, the air discharged from the second sirocco fan 72 flows through the second discharge side duct portion 762, branches into two, and passes through the discharge side discharge ports 7622B and 7622P. Are emitted to the blue light side of the polarization conversion element 623 and the optical device 65. The discharged air flows along the polarization conversion element 623, the blue light side liquid crystal panel 651B, and the polarizing plates 652 and 653, and cools the optical components 623, 651B, 652, and 653.

According to this embodiment described above, the following effects are obtained.
In the present embodiment, the projector 1 includes two fans, a first sirocco fan 71 and a second sirocco fan 72 that take in air outside the upper case 5 through the air inlet 52. This is necessary for efficiently cooling various optical components (the polarization conversion element 623, each liquid crystal panel 651, each incident side polarizing plate 652, each exit side polarizing plate 653, etc.) inside the upper case 5. The predetermined intake amount may be supplemented by the two fans 71 and 72, and the two fans 71 and 72 can be constituted by a small fan having a smaller suction force than a conventional sirocco fan. Therefore, the two fans 71 and 72 can maintain the predetermined suction amount, efficiently cool the various optical components 623, 651 to 653, and reduce the size of the two fans 71 and 72 to reduce the upper case 5. The projector 1 can be reduced in size because it is not necessary to be formed large in the thickness direction (Y-axis direction).

  The second sirocco fan 72 has a size larger than that of the first sirocco fan 71. The smaller first sirocco fan 71 is disposed between the projection lens 66 and the air inlet 52. Thus, even when the first sirocco fan 71 and the second sirocco fan 72 are not arranged shifted in the projection direction (Z-axis direction), the first sirocco fan 71 and the second sirocco fan 72 are viewed from the intake port 52 side (+ X-axis direction side). A part of the second sirocco fan 72 is located outside the sirocco fan 71. For this reason, the air which goes to the 2nd sirocco fan 72 via the inlet port 52 passes along the fan rotation axis Ax2 outside the 1st sirocco fan 71, and can implement | achieve the structure which is easy to be suck | inhaled by the 2nd sirocco fan 72. . Accordingly, it is not necessary to dispose the first sirocco fan 71 and the second sirocco fan 72 in the projection direction, and the projector 1 can be reduced in size without forming the upper case 5 large in the projection direction.

  Further, the first sirocco fan 71 and the second sirocco fan 72 are disposed at positions where the respective fan rotation axes Ax1 and Ax2 are shifted from each other. As a result, when viewed from the intake port 52 side, a portion of the second sirocco fan 72 located outside the first sirocco fan 71 (hereinafter referred to as a shift portion) is moved relative to the fan rotation axis Ax1 of the first sirocco fan 71. The second sirocco fan 72 can be collectively positioned at a predetermined position in the direction of deviation of the fan rotation axis Ax2. The intake duct 73 has an L-shape in plan view that surrounds the suction surface 711 of the first sirocco fan 71 and the outer periphery along the fan rotation axis Ax1. As a result, the air intake side duct 73 is arranged by disposing the extending portion 732 located on the outer peripheral side of the first sirocco fan 71 in the air intake side duct 73 so as to oppose the shift portion of the second sirocco fan 72. Thus, the air circulated to the projection lens 66 side can be effectively inhaled by the second sirocco fan 72. Therefore, the intake duct 73 having a simple shape can be manufactured easily and the manufacturing cost can be reduced, and the second sirocco fan 72 can effectively suck the air outside the upper case 5 through the intake port 52. Can be made.

  Here, in the intake side duct 73, a partition portion 7313 is provided that partitions into a first region Ar1 including the first intake side discharge port 7312 and a second region Ar2 including the second intake side discharge port 7321. Yes. Thus, the air flow path toward the first intake side exhaust port 7312 and the air flow path toward the second intake side discharge port 7321 can be made independent of each other, and the first sirocco fan 71 and the second sirocco Even the control state of the fan 72 does not affect each flow rate of the air discharged through the first intake side exhaust port 7312 and the second intake side exhaust port 7321.

Further, since the projector 1 includes the connecting duct main body 75, the air circulated to the projection lens 66 side through the intake side duct 73 can be guided to the second sirocco fan 72 by the connecting duct main body 75. The second sirocco fan 72 can effectively suck air outside the upper case 5 through the air inlet 52.
Further, the fan support portion 7512 constituting the connection duct main body 75 has a function of supporting the first sirocco fan 71 and an air flow path C from the connection side introduction port 7511 in the connection duct main body 75 toward the second sirocco fan 72. It has the communication chamber R which communicates with and also has a function as a duct. Accordingly, for example, the volume inside the connecting duct body 75 can be set larger than in the configuration in which the communication chamber is not provided in the fan support portion, and is introduced into the second sirocco fan 72 when the second sirocco fan 72 is driven. As the air flowing through the communication chamber R decreases, the wind speed of the air decreases, so that the noise caused by the air flowing through the connecting duct body 75 can be reduced, and the silence of the projector 1 can be ensured.

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 71 and the second sirocco fan 72 are arranged in an eccentric state so that the respective fan rotation axes Ax1 and Ax2 are shifted from each other. You may arrange | position so that fan rotating shaft Ax1, Ax2 may be located on the same axis | shaft.

  In the embodiment, as the cooling target of the cooling device 7, the polarization conversion element 623, each liquid crystal panel 651, each incident side polarizing plate 652, and each emission side polarizing plate 653 are employed. Other components such as the power supply unit and the light source device 61 may be adopted.

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. In this case, the polarizing plates 652 and 653 on the light incident side and the light emitting side can be omitted.

  Since the projector of the present invention can be reduced in size, it can be used as a projector used for presentations and home theaters.

FIG. 2 is a perspective view illustrating a schematic configuration of a projector according to the present embodiment. The perspective view which shows a part of upper case in the said embodiment typically. The figure which shows the structure of the optical unit in the said embodiment typically. The figure which shows the structure of the cooling device in the said embodiment. The figure which shows the structure of the cooling device in the said embodiment. The perspective view which shows the structure of the intake side duct in the said embodiment. The perspective view which shows the structure of the intake side duct in the said embodiment. The perspective view which shows the structure of the connection duct in the said embodiment. The perspective view which shows the structure of the connection duct in the said embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Projector, 5 ... Upper case (exterior housing | casing), 52 ... Intake port, 61 ... Light source device, 66 ... Projection lens (projection optical apparatus), 71 ... 1st Sirocco fan, 72 ... second sirocco fan, 73 ... intake side duct, 74 ... connection duct, 651 ... liquid crystal panel (light modulation device), 7312 ... first intake side exhaust port, 7313: Partition part, 7321: Second intake side discharge port, 7512 ... Fan support part, Ar1, Ar2 ... area, Ax1, Ax2 ... Fan rotation axis, C ... Flow passage , R ... Communication room.

Claims (3)

A light source device; a light modulation device that modulates a light beam emitted from the light source device according to image information; a projection optical device that magnifies and projects the light beam modulated by the light modulation device; the light source device; A projector comprising a modulation device and an exterior housing that houses the projection optical device therein,
When the projector is installed in a predetermined posture state, the exterior housing has an air inlet for introducing external air into a position facing the projection optical device on the side surface along the vertical direction. Formed,
A first sirocco fan which is disposed opposite to each other with the projection optical device interposed therebetween so that a fan rotation axis intersects with a projection direction by the projection optical device, and introduces external air into the inside through the intake port; With a second sirocco fan,
The second sirocco fan has a larger shape than the first sirocco fan,
The first sirocco fan is disposed between the projection optical device and the air inlet ;
The first sirocco fan and the second sirocco fan are respectively disposed at positions where the respective fan rotation shafts are displaced from each other.
Arranged between the first sirocco fan and the intake port, air introduced into the exterior casing through the intake port is divided and distributed to the first sirocco fan side and the projection optical device side Equipped with intake side duct
The intake side duct is
An intake-side duct body that faces the suction surface of the first sirocco fan and circulates the internal air to the first sirocco fan side, and an outer periphery that faces the outer periphery along the fan rotation axis of the first sirocco fan. An extension part that circulates to the projection optical device side, and has an L-shape in plan view by integrally forming the intake side duct body and the extension part,
On the surface of the intake duct facing the intake port,
An intake side introduction port is formed for introducing air introduced into the exterior casing through the intake port into the intake side duct;
The intake side inlet is
The projector, wherein the projector is formed so as to overlap both the inside of the intake-side duct body and the inside of the extending portion when viewed from the direction along the fan rotation axis . The projector according to claim 1 , wherein
The intake side duct has a first intake side exhaust port for exhausting internal air to the first sirocco fan side, and a second intake side exhaust port for exhausting internal air to the projection optical device side. Have
The projector according to claim 1, wherein a partition section is provided inside the intake side duct so as to partition into a region including the first intake side discharge port and a region including the second intake side discharge port. In the projector according to claim 1 or 2 ,
The air extending from the first sirocco fan side to the second sirocco fan side along the outer surface along the projection direction of the projection optical device, and the air circulated to the projection optical device side by the intake side duct is the first sirocco fan side. 2 With a connecting duct leading to the sirocco fan,
The connecting duct is
A fan support for mounting the first sirocco fan, facing the first sirocco fan,
The fan support part is formed in a hollow shape having a communication chamber that communicates with an air flow path toward the second sirocco fan in the connection duct.

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