JP2017187622A - Light source device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device and a projector that are able to efficiently cool a light emitting tube.SOLUTION: A light source device used by being incorporated in a projector which includes a cooling device for delivering cooling gas comprises a light emitting tube and a storage body which stores the light emitting tube and emits light emitted from the light emitting tube in a first direction. The storage body has a duct part located in a circumferential direction around a center axis of the light emitting tube. The duct part includes an introduction port, an inner surface part in the circumferential direction, and a first delivery part for delivering cooling gas guided from the introduction port to the light emitting tube. The first delivery part has an opening located closer to the first direction side than the center of the light emitting tube and formed by an edge along the inner surface part, and a wall part located closer to the light emitting tube side than the inner surface part correspondingly to the opening. The cooling gas guided from the introduction port circulates in the circumferential direction along the inner surface part, then circulates in the first direction and passes through the opening, and circulates in a direction opposite to the first direction along the wall part, so as to be delivered to the light emitting tube.SELECTED DRAWING: Figure 15

Description

  The present invention relates to a light source device and a projector.

  Conventionally, a light source device having a light source lamp, a light modulation device that modulates the light emitted from the light source device to form an image according to image information, and the formed image is enlarged on a projection surface such as a screen There is known a projector including a projection optical device for projecting. In the light source device applied to such a projector, the light source lamp has a short lifetime unless it is lit at a temperature suitable for the light source lamp, and thus needs to be appropriately cooled. In particular, in the light source lamp, the upper part (upper part in the vertical direction) of the light emitting part in which the luminescent material is sealed has the highest temperature, and thus the upper part needs to be efficiently cooled.

Here, the projector can take a normal placement posture that is a posture placed on the installation table, and a reverse placement posture that is fixed to the ceiling or the like upside down from the normal placement posture.
For this reason, a projector (projection type display device) having a light source device that changes the flow path of the cooling gas taken inside according to the attitude of the projector and distributes the cooling gas to the upper part of the light emitting part of the light source lamp. It is known (see, for example, Patent Document 1).

  In the projector described in Patent Document 1, a discharge lamp having a reflector and a power supply bulb is attached to a lamp holder having a bottom surface support portion and a front surface support portion raised from one side edge of the bottom surface support portion. A light source device (lamp unit) is included. Among these, it has an intake port located in the center of one side edge and a support wall protruding downward so as to surround the intake port from three sides, and a wind direction changing plate rotates on the support wall It is supported freely.

When such a projector is used, a part of the cooling air taken into the outer casing (outer casing) is restricted in the wind direction by the wind direction changing plate supported by the support wall, and the intake port and the reflector It is discharged into the reflector through the air blowing hole of the cap.
At this time, in the stationary state, the wind direction changing plate is rotated by its own weight, and the tip portion is brought into contact with the facing portion of the outer casing. In this case, the cooling air is discharged toward the vicinity of the high temperature position above the central portion of the power supply valve.
On the other hand, in the ceiling suspended state, the wind direction changing plate is rotated by its own weight, and the leading end is brought into contact with the leading edge of the blowing end portion of the blowing duct. Also in this case, the cooling air is discharged toward the vicinity of the high temperature position above the central portion of the power supply valve.
As described above, in both the stationary state and the suspended state, the cooling air is discharged toward the position above the central portion of the valve that is the highest temperature during use.

JP 2002-189247 A

  However, in the light source device described in Patent Document 1, after the cooling air travels in a direction opposite to the traveling direction of the light emitted from the light source device, the wind direction is changed by the wind direction changing plate, and the arc tube ( It is discharged toward the power supply valve. For this reason, there is a problem that cooling air cannot be appropriately blown to the arc tube.

  SUMMARY An advantage of some aspects of the invention is to provide a light source device and a projector that can cool an arc tube efficiently.

  A light source device according to a first aspect of the present invention is a light source device that is used by being incorporated in a projector including a cooling device that sends out a cooling gas. The light source device houses an arc tube and the arc tube, and A housing that emits the emitted light in a first direction, and the housing includes a duct portion that is disposed along a circumferential direction around a central axis of the arc tube, and the duct portion. Is an introduction port for introducing cooling gas into the duct portion, an inner surface portion along the circumferential direction, and a first delivery portion for delivering the cooling gas introduced from the introduction port to the arc tube. And the first delivery part is located on the first direction side from the center of the arc tube, and is formed by an edge along the inner surface part, and from the inner surface part according to the opening part. A wall portion located on the arc tube side, and introduced from the inlet The cooled gas flows in the circumferential direction along the inner surface, then flows in the first direction, passes through the opening, and is opposite to the first direction along the wall. It distribute | circulates to the side and is sent out to the said arc_tube | light_emitting_tube.

  According to the first aspect, the cooling gas introduced from the introduction port flows along the circumferential direction, then flows in the first direction, passes through the opening, and is closer to the arc tube than the inner surface, that is, Then, along the wall portion located on the inner side of the inner surface portion, it circulates in the direction opposite to the first direction and is sent to the arc tube. According to this, after the cooling gas that has circulated along the circumferential direction is circulated to the first direction side at the first delivery part, the cooling gas is turned back to the opposite direction side to the first direction side, thereby Can be easily directed to the arc tube. Therefore, since the cooling gas can easily flow through the arc tube, the arc tube can be efficiently cooled.

In the first aspect, it is preferable that the duct part has a second sending part that sends the cooling gas introduced from the introduction port to the arc tube from a direction different from that of the first sending part.
According to such a configuration, when the cooling gas is sent to the arc tube from each of the first delivery unit and the second delivery unit, the cooling gas can be delivered to the arc tube from different directions. It can be cooled effectively.
On the other hand, for example, as long as the cooling gas is selectively sent from the sending part located on the upper side in the vertical direction with respect to the arc tube out of the first sending part and the second sending part, as described above, the arc tube In this case, the upper part of the arc tube that is likely to become hot can be effectively cooled by the cooling gas delivered from the upper side in the vertical direction.

In the first aspect, the duct part is located between the first delivery part and the second delivery part in the duct part, and opens and closes the duct part according to a posture; It is preferable to have a second opening / closing member that opens and closes a delivery part located on the upstream side of the flow path of the cooling gas among the one delivery part and the second delivery part.
According to such a configuration, when the first opening / closing member opens the duct part, the second opening / closing member closes the sending part located on the upstream side of the flow path, so that the delivery located on the downstream side of the flow path. Cooling gas can be guided to the part. As a result, the cooling gas can be delivered to the arc tube via the delivery unit located on the downstream side.
In addition, when the first opening / closing member closes the duct portion, the second opening / closing member opens the delivery portion located on the upstream side, whereby the cooling gas is supplied to the arc tube via the delivery portion located on the upstream side. Can be sent.
Therefore, according to the attitude | position of a light source device, a cooling gas can be reliably distribute | circulated to either a 1st sending part and a 2nd sending part, and a cooling gas can be reliably sent to a light emission tube from each sending part.

In the first aspect, the second opening / closing member opens and closes the first delivery part, and the second opening / closing member has a shaft part pivotally supported by the duct part on one end side, and the shaft is supported by its own weight. It is preferable to have a shielding plate that pivots around the opening to open and close the opening.
Here, when the second opening and closing member opens and closes the first delivery part, it is conceivable to open and close either the opening part or another opening part in which a part of the edge is formed by the wall part. . However, since the other opening is located on the downstream side of the flow path with respect to the opening, even when the first delivery part is closed, a part of the cooling gas flowing through the duct part is not included in the other opening. It circulates and stays to a part, and the flow volume of the cooling gas circulated to the 2nd sending part will be reduced.
On the other hand, according to the above configuration, since the opening located on the upstream side of the flow path in the first delivery part is opened and closed by the second opening / closing member, the first delivery part is closed when the first delivery part is closed. It is possible to prevent the cooling gas from flowing to the downstream side of the flow path in the delivery unit. Therefore, it can suppress that the said retention arises and can suppress the fall of the flow volume of the cooling gas distribute | circulated to a 2nd delivery part.

In the first aspect, the second opening / closing member includes a plurality of the shielding plates, and the plurality of shielding plates are supported by the shaft portion at an edge of the opening, and at least of the plurality of shielding plates. Either of them is rotated by its own weight, and the part on the opposite side to the shaft part is preferably in contact with the part on the shaft part side in another shielding plate.
According to such a configuration, the shafts of the plurality of shielding plates constituting the second opening / closing member are supported by the edge of the opening, so that the openings can be reliably opened and closed by the plurality of shielding plates. it can. In addition, when at least one of the plurality of shielding plates comes into contact with another shielding plate, the first opening can be reliably closed by the plurality of shielding plates. Therefore, it can suppress that the flow volume of the cooling gas distribute | circulated to a 2nd sending part is reduced.

A projector according to a second aspect of the present invention includes the light source device, a light modulation device that modulates light emitted from the light source device, and a projection optical device that projects light modulated by the light modulation device. It is characterized by providing.
According to the said 2nd aspect, there can exist an effect similar to the light source device which concerns on the said 1st aspect. In addition, by employing the light source device that can extend the life of the arc tube that is efficiently cooled, the maintenance work of the projector can be saved.

In the second aspect, it is preferable that the projector is configured to be installed in a posture in which the first sending section is vertically above the arc tube.
According to such a configuration, the cooling gas delivered from the first delivery part can be easily circulated to the upper part in the vertical direction of the arc tube, and thus to the upper part in the vertical direction of the light emission part. Therefore, the arc tube can be efficiently cooled, and the lifetime of the arc tube can be reliably increased.

1 is a perspective view showing a projector according to an embodiment of the invention. The schematic diagram which shows the structure of the apparatus main body which concerns on the said one Embodiment. Sectional drawing which shows typically the internal structure of the projection optical apparatus which concerns on the said one Embodiment. The perspective view which shows the light source device seen from the light-projection side which concerns on the said one Embodiment. The perspective view which shows the light source device seen from the opposite side to the light emission side which concerns on the said one Embodiment. The perspective view which shows the light source device which removed the duct formation member from the state shown in FIG. The perspective view which shows the 1st housing | casing and duct formation member which concern on the said one Embodiment. Sectional drawing which shows the 1st housing | casing and duct formation member which concern on the said one Embodiment. Sectional drawing which shows the 1st housing | casing and duct formation member which concern on the said one Embodiment. Sectional drawing which shows the container in the reverse placement attitude | position which concerns on the said one Embodiment. Sectional drawing which shows the container in the upper side projection attitude | position which concerns on the said one Embodiment. Sectional drawing which shows the container in the lower side projection attitude | position which concerns on the said one Embodiment. The perspective view which shows the shielding board which concerns on the said one Embodiment. Sectional drawing which shows the sending part of the 1st wind guide part which concerns on the said one Embodiment. Sectional drawing which shows the sending part of the 1st wind guide part which concerns on the said one Embodiment. The figure which shows the flow path of the cooling gas which distribute | circulates the sending part of the 1st air guide part which concerns on the said one Embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[External configuration of projector]
FIG. 1 is a perspective view showing a projector 1 according to this embodiment.
The projector 1 according to the present embodiment modulates light emitted from a light source device 5 (see FIG. 2) provided therein to form an image according to image information, and the image is a projection surface such as a screen. It is an image display device that projects an enlarged image. As shown in FIG. 1, the projector 1 includes an exterior housing 2 that constitutes an exterior and accommodates an apparatus main body 3 described later.
The exterior housing 2 is a synthetic resin housing having a substantially rectangular parallelepiped shape as a whole. The exterior housing 2 is configured by combining an upper case 2A and a lower case 2B, and includes a top surface portion 21, a bottom surface portion 22, a left side surface portion 23, a right side surface portion 24, a back surface portion 25, and a front surface portion 26. The bottom surface portion 22 is a surface opposite to the top surface portion 21, the right side surface portion 24 is a surface opposite to the left side surface portion 23, and the front surface portion 26 is a surface opposite to the back surface portion 25.
Among these, a part of the projection optical device 44 of the image projection device 4 constituting the device main body 3 is exposed on the top surface portion 21, and an opening 211 through which an image formed by the image projection device 4 passes is located. To do.

[Device configuration]
FIG. 2 is a schematic diagram showing the configuration of the apparatus main body 3.
The apparatus main body 3 corresponds to the internal configuration of the projector 1 and is accommodated in the exterior casing 2. As shown in FIG. 2, the apparatus main body 3 includes an image projection device 4 and a cooling device 9. Although not shown, the apparatus main body 3 includes, in addition to these, a control device that controls the operation of the entire projector 1, a power supply device that supplies power to the electronic components that constitute the projector 1, and the like.
Among these, the cooling device 9 has the cooling fan 91 which discharges the cooling gas taken in in the exterior housing | casing 2 to the container 6 of the light source device 5 mentioned later.

[Configuration of image projection apparatus]
The image projection device 4 forms and projects an image according to image information (including an image signal) under the control of the control device. The image projection device 4 includes a light source device 5, a uniformizing device 41, a color separation device 42, an image forming device 43, a projection optical device 44, and an optical component housing 45.
In the following description, the traveling direction of the light emitted from the light source device 5 is the + Z direction, and the directions orthogonal to the + Z direction and orthogonal to each other are the + X direction and the + Y direction. In the present embodiment, the + Z direction is a direction from the right side surface portion 24 toward the left side surface portion 23. Therefore, the + Y direction is a direction from the bottom surface portion 22 toward the top surface portion 21, and the + X direction is the front surface portion 26 to the back surface portion. The direction toward 25. That is, the + X direction is opposite to the image projection direction by the projection optical device 44 when the projector 1 is viewed in plan from the top surface 21 side. Although not shown, for convenience of explanation, the direction opposite to the + Z direction is set to the −Z direction. The same applies to the −X direction and the −Y direction.
In the present specification, the vertical direction indicates the direction of gravity, the upper side in the vertical direction indicates the direction opposite to the direction of gravity, and the lower side in the vertical direction indicates the side in the direction of gravity. Further, upward in the vertical direction and upward in the vertical direction indicate that the direction is opposite to the gravitational direction, and downward in the vertical direction and downward in the vertical direction indicate that the direction is in the gravitational direction. Further, the upper part in the vertical direction indicates a part on the opposite side to the direction of gravity. In addition, the horizontal direction indicates a direction orthogonal to the direction of gravity.

[Configuration of light source device]
The light source device 5 includes an arc tube 51, a main reflecting mirror 52, a collimating lens 53, and a container 6, and emits a light beam to the homogenizing device 41.
The arc tube 51 includes a substantially spherical light emitting portion 511 in which a light emitting substance and an electrode are enclosed, and sealing portions 512 and 513 extending in opposite directions from both ends of the light emitting portion 511. Among these, when lamp power is supplied to the electrodes in the light emitting unit 511 via lead wires (not shown) that pass through the sealing units 512 and 513, discharge light emission occurs in the light emitting unit 511.
The arc tube 51 is provided with a sub-reflecting mirror 514 that covers a region of the light emitting unit 511 on the sealing unit 512 side and reflects light incident from the light emitting unit 511 toward the main reflecting mirror 52. Yes.

The main reflecting mirror 52 corresponds to the reflecting mirror of the present invention, and is fixed to the sealing portion 513. The main reflecting mirror 52 has a concave curved reflecting surface that reflects light incident from the light emitting unit 511 (including light reflected by the sub-reflecting mirror 514) and enters the collimating lens 53.
The collimating lens 53 collimates the light incident from the arc tube 51 and the main reflecting mirror 52 and emits the light toward the uniformizing device 41. In addition, the collimating lens 53 also functions as an explosion-proof member that prevents the fragments of the arc tube 51 from scattering when the arc tube 51 is ruptured.
The container 6 houses the arc tube 51, the main reflecting mirror 52, and the collimating lens 53. The configuration of the container 6 will be described in detail later.

[Configuration of homogenizer]
The uniformizing device 41 uniformizes the illuminance in the plane orthogonal to the central axis of the light beam incident from the light source device 5. The homogenizer 41 includes a first lens array 411, a dimmer 412, a second lens array 413, a polarization conversion element 414, and a superimposing lens 415 in the order of incidence of light from the light source device 5.

[Configuration of color separation device]
The color separation device 42 separates the light beam incident from the uniformizing device 41 into three color lights of red (R), green (G), and blue (B), and enters the three color lights into the image forming apparatus 43. Let The color separation device 42 includes dichroic mirrors 421 and 422, reflection mirrors 423, 424 and 425, an incident side lens 426, and a relay lens 427.
The dichroic mirror 421 reflects blue light and transmits green light and red light. The dichroic mirror 422 reflects green light and transmits red light.
The reflection mirror 423 is provided on the optical path of blue light. The reflection mirrors 424, 425, the incident side lens 426, and the relay lens 427 are provided on the optical path of red light.

[Configuration of Image Forming Apparatus]
The image forming apparatus 43 modulates each separated color light for each color light to form an image according to the image information. The image forming apparatus 43 includes a field lens 431, an incident side polarizing plate 432, a light modulation device 433, an output side polarizing plate 434 provided for each color light, and a cross dichroic prism 435 as a color composition device.
Of these, the light modulator 433 (red, green and blue light modulators are 433R, 433G, and 433B, respectively) modulates incident color light based on image information input from the control device. To do. As such a light modulation device 433, a liquid crystal panel is employed in the present embodiment.
Further, the cross dichroic prism 435 emits image light obtained by synthesizing each color light (each color image) modulated by each light modulation device 433R, 433G, 433B.

[Configuration of Projection Optical Device]
FIG. 3 is a cross-sectional view schematically showing the internal configuration of the projection optical device 44.
The projection optical device 44 enlarges and projects the image light incident from the image forming device 43 onto the projection surface. As shown in FIG. 3, the projection optical device 44 includes a plurality of lenses 441, an aspherical mirror 442, and a hollow holding body 443 that houses them.
The plurality of lenses 441 includes, for example, a zoom lens and a focus lens.
The aspherical mirror 442 is disposed on the most downstream side of the optical path in the projection optical device 46 so that the reflection surface 442A having a free-form surface that is not rotationally symmetric faces the + X direction side and the + Y direction side. The aspherical mirror 442 folds the image light guided to the −X direction side by the plurality of lenses 441 in the + X direction and the + Y direction side, and widens the image light.
The holding body 443 has an opening 4431 through which an image reflected by the aspherical mirror 442 passes in a portion on the top surface 21 side, and is a substrate such as glass that is fitted in the opening 4431 and transmits visible light. 4432. The image light that has passed through the opening 4431 and the substrate 4432 is emitted to the outside of the exterior housing 2 through the opening 211.

[Configuration of optical component casing]
The optical component casing 45 shown in FIG. 2 is a box-shaped casing having a component storage member positioned on the −Y direction side and a lid-shaped member positioned on the + Y direction side. 44 is integrated. The image projection apparatus 4 integrated in this way is configured in a substantially L shape extending in the + Z direction and the + X direction.
An illumination optical axis AX is set in the optical component casing 45, and the light source device 5 and the devices 41 and 42 are arranged at predetermined positions on the illumination optical axis AX, and the devices 43 and 44 are disposed. Are arranged on an extension line of the illumination optical axis AX. For this reason, when the light source device 5 is connected to the optical component casing 45, the central axis of the light beam emitted from the light source device 5 coincides with the illumination optical axis AX.

[Container structure]
4 and 5 are perspective views showing an appearance of the container 6 constituting the light source device 5. FIG. Among these, FIG. 4 is a perspective view showing the light source device 5 seen from the light emitting side, and FIG. 5 is a perspective view showing the light source device 5 seen from the side opposite to the light emitting side. FIG. 6 is a perspective view showing the light source device 5 with the duct forming member 6C removed from the state shown in FIG.
As described above, the housing 6 is a light source housing that constitutes the exterior of the light source device 5, houses the arc tube 51 and the main reflecting mirror 52 therein, and holds the collimating lens 53. . As shown in FIGS. 4 to 6, the container 6 includes a first housing 6 </ b> A that covers the front side (+ Z direction side) of the main reflecting mirror 52, and the back side (−Z direction side) of the main reflecting mirror 52. ) And a duct forming member 6C that is attached to the first housing 6A and forms the duct portion 7 in the first housing 6A. The container 6 includes a top surface portion 61, a bottom surface portion 62, a left surface portion 63, a right surface portion 64, a back surface portion 65, and a front surface portion 66 configured by combining the housings 6 </ b> A and 6 </ b> B and the duct forming member 6 </ b> C. .

  As shown in FIG. 5, the top surface portion 61 positioned on the + Y direction side has a handle 611 at a position on the back surface portion 65 side. The handle 611 is formed in a substantially U shape, and both ends of the handle 611 are rotatably supported by the left side surface portion 63 and the right side surface portion 64. That is, the handle 611 is rotatably supported so as to stand up in the + Y direction from the top surface portion 61, and the light source device 5 housed in a light source housing portion (not shown) provided in the exterior housing 2 can be easily taken out. doing.

As shown in FIGS. 4 and 6, the front portion 66 located on the + Z direction side has an opening 661 through which light emitted from the arc tube 51 and the main reflecting mirror 52 is transmitted, and according to the opening 661. The collimating lens 53 (not shown in FIGS. 4 and 6) is disposed at the position. The collimating lens 53 is locked by a leaf spring 662 that is a locking member.
End portions 663 on the −X direction side and the −Y direction side in the front portion 66 protrude in the −X direction side, and the duct forming member 6C is attached so as to cover the end portion 663 from the + Y direction side. By attaching the duct forming member 6 </ b> C to such an end portion 663, a part of the duct portion 7 described later is formed.

The right side surface portion 64 located on the −X direction side has a connector connected to the arc tube 51, although not shown. This connector is connected to a connector disposed in the light source housing, and the lamp power supplied to the arc tube 51 is supplied through these connectors.
Further, the right side surface portion 64 has an inlet (not shown) at a position on the back surface portion 65 side. This introduction port introduces the cooling gas outside the container 6 into the space on the −Z direction side with respect to the main reflecting mirror 52 in the container 6.

As shown in FIG. 5, the left side surface portion 63 positioned on the + X direction side includes a discharge port 631 positioned on a + Z direction side portion (a portion configured by the first housing 6 </ b> A), and a −Z direction side portion ( And a discharge port 632 located in a portion formed by the second housing 6B.
The discharge port 631 discharges the air that has cooled the arc tube 51 in the space on the + Z direction side with respect to the main reflecting mirror 52 in the housing 6 to the outside of the housing 6. Although not shown, a metal mesh is attached to the discharge port 631.
The discharge port 632 is introduced from the introduction port located in the right side surface portion 64 and circulates along the −Z direction side portion of the main reflecting mirror 52, and the cooling gas that has cooled the main reflecting mirror 52 is supplied to the container 6. Drain outside.

[Internal configuration of first housing]
FIG. 7 is a perspective view of the first housing 6A to which the duct forming member 6C is attached as viewed from the −X direction side and the −Z direction side. 8 and 9 are cross-sectional views taken along the XY plane of the first housing 6A and the duct forming member 6C. In addition, in FIG. 8, illustration of valve V4 (refer FIG. 9) mentioned later is abbreviate | omitted.
As described above, the first housing 6A opens to the −Z direction side, and the main reflecting mirror 52 is connected so as to close the opening, and covers the reflecting surface of the main reflecting mirror 52 from the + Z direction side. It is a box-shaped housing. As shown in FIGS. 7 to 9, the first housing 6 </ b> A has a substantially octagonal inner wall portion 6 </ b> A <b> 1 when viewed from the −Z direction side. The inner wall portion 6 </ b> A <b> 1 includes the arc tube 51 and the main reflecting mirror 52. A space S is formed between the lens and the collimating lens 53. That is, the inner wall portion 6A1 surrounds the arc tube 51 along the circumferential direction of the arc tube 51 arranged so that the central axis is along the + Z direction.
As shown in FIGS. 7 and 9, a substantially octagonal cylindrical light shielding member 6 </ b> D that shields the light emitted from the arc tube 51 is attached to the inner wall 6 </ b> A <b> 1. An opening 6D1 that discharges the cooling gas that has cooled the arc tube 51 to the outside of the housing 6 together with the discharge port 631 is formed in the portion on the + X direction side of the light shielding member 6D.

[Configuration of duct part]
As shown in FIGS. 8 and 9, the duct portion 7 is formed by combining the first housing 6 </ b> A and the duct forming member 6 </ b> C, and the arc tube along the circumferential direction around the central axis of the arc tube 51. 51 is provided so as to substantially surround it. That is, the duct portion 7 is centered on the central axis (+ Z direction) of the arc tube 51 so as to cover (enclose) the arc tube 51 on the + Y direction side, the + X direction side, the −Y direction side, and the −X direction side. It is provided as.

Such a duct portion 7 includes an introduction port 71, a branch portion 72, a first air guide portion 73, and a second air guide portion 74.
The introduction port 71 is formed by combining the first housing 6A and the duct forming member 6C, and is open to the front portion 66 side. The inlet 71 is connected to the outlet of the cooling fan 91 that constitutes the cooling device 9, and introduces the cooling gas sent out by the cooling fan 91 into the duct portion 7.
The branch portion 72 is located in the duct portion 7 in the vicinity of the introduction port 71 and is connected to the first air guide portion 73 and the second air guide portion 74.

Each of the first air guide portion 73 and the second air guide portion 74 is configured so that the cooling gas introduced into the inside through the introduction port 71 can flow.
The first air guide portion 73 extends from the branch portion 72 along the inner wall portion 6A1 to the + X direction side, and then extends along the inner wall portion 6A1 to the −Y direction side. The second air guide portion 74 extends from the branch portion 72 along the inner wall portion 6A1 to the −Y direction side, and then extends along the inner wall portion 6A1 to the + X direction side. Note that the first air guide portion 73 and the second air guide portion 74 are separated from the space S by the inner wall portion 6A1.
That is, as shown in FIG. 9, when the first housing 6 </ b> A is viewed from the −Z direction side, the first air guide portion 73 covers the + Y direction side and the + X direction side with respect to the arc tube 51. The second air guide portion 74 is positioned so as to cover the −X direction side and the −Y direction side with respect to the arc tube 51.
It is to be noted that the leading end portion in the -Y direction that becomes the end of the cooling gas flow path in the first air guiding portion 73, and the extension in the + X direction that becomes the end of the cooling gas flow path in the second air guiding portion 74. The outlet 631 is not connected to the tip in the exit direction, and the discharge port 631 is located between the tips. That is, the first air guide portion 73 and the second air guide portion 74 are formed so as to surround the arc tube 51 on the + X direction side except for a part on the −Y direction side.

  In such a duct portion 7, the branch portion 72 has a valve V <b> 1 that guides the cooling gas (introduction gas) introduced from the introduction port 71 to either the first air guide portion 73 or the second air guide portion 74. Is provided. The valve V1 is a shielding plate whose one end is rotatably supported by the inner wall portion 6A1. The valve V1 is rotated by its own weight, so that the cooling gas is supplied to either the first air guide portion 73 or the second air guide portion 74. Lead to crab. The switching of the cooling gas flow path by the valve V1 will be described in detail later.

[Configuration of the first air guide section]
The first air guiding unit 73 includes a sending unit 731, a sending unit 732, and a valve V2.
The sending units 731 and 732 send the cooling gas flowing through the first air guide unit 73 toward the light emitting unit 511 of the arc tube 51. Among these, the sending unit 731 is located on the + Y direction side with respect to the arc tube 51 when the first housing 6A is viewed from the −Z direction side, and sends the cooling gas to the light emitting unit 511 from the + Y direction side. Similarly, when the first housing 6A is viewed from the −Z direction side, the sending unit 732 is positioned on the + X direction side with respect to the arc tube 51 and sends the cooling gas to the light emitting unit 511 from the + X direction side.

The valve V <b> 2 is positioned between the sending parts 731 and 732 in the flow path of the cooling gas flowing through the first air guiding part 73, and the cooling gas introduced into the first air guiding part 73 is sent to the sending part 731. 732.
Specifically, the valve V2 is a shielding plate whose one end is rotatably supported by the inner surface portion 73A on the opposite side of the first air guide portion 73 from the arc tube 51 side. The valve V2 rotates about the one end to the -Y direction side on the + X direction side by its own weight, and the other end is an inner surface portion 73B opposite to the inner surface portion 73A (an inner surface portion 73B on the arc tube 51 side). The first air guide portion 73 is closed (shielded), and the cooling gas is guided to the delivery portion 731. Further, when the valve V2 rotates to the + Y direction side on the −X direction side and the other end of the valve V2 comes into contact with the inner surface portion 73A, the first air guiding portion 73 is opened, and thereby the cooling gas is Guided to the sending unit 732. Here, the inner surface portion 73B is a portion that forms a part of the inner wall portion 6A1 of the inner wall portion 6A1 that surrounds the arc tube 51 along the circumferential direction of the arc tube 51. That is, the inner surface portion 73 </ b> B is a portion along the circumferential direction of the arc tube 51.
A recess 733 (first recess) that is recessed on the opposite side to the inner surface portion 73B is formed in the inner surface portion 73A that supports the valve V2. And when the 1st air guide part 73 is open | released, the valve V2 is arrange | positioned in the recessed part 733, and it is suppressed that the cross-sectional area of the 1st air guide part 73 is reduced by the valve V2. The occurrence of pressure loss of the cooling air due to hitting the valve V2 is suppressed.
Further, the contact portion of the free end of the valve V2 (the end opposite to the rotation shaft side) in the inner surface portion 73B is set to the edge of the opening 7311 in the delivery portion 731.

The sending unit 731 includes an opening 7311 (first opening) that opens into the first air guide 73 and a valve V3 that opens and closes the opening 7311.
The opening 7311 is an opening through which the cooling gas flowing through the first air guide 73 passes, and sends the cooling gas to the light emitting unit 511 from the + Y direction side. As described above, the opening 7311 is formed by the edge along the inner surface portion 73B, and is located on the + Z direction side from the light emitting portion 511 located at the center of the arc tube 51.
The valve V3 is constituted by a plurality of shielding plates PL, and in this embodiment is constituted by two shielding plates PL. One end of each of the shielding plates PL is rotatably supported by the edge of the opening 7311 and is rotated by its own weight. And when these shielding plates PL rotate to one side (on the + X direction side, the terminal end side of the first air guide portion 73) and are arranged along the flow direction of the cooling gas passing through the opening portion 7311. The opening 7311 is opened, and the cooling gas can pass through the opening 7311. On the other hand, the shielding plate PL rotates to the other side (on the −X direction side, the proximal end side of the first air guide portion 73), and the distal end portion of one shielding plate PL (on the side opposite to the rotation shaft side). The end 7311 is in contact with the inner wall of the opening 7311 and the tip of the other shielding plate PL is in contact with the end of the one shielding plate PL on the rotating shaft side, thereby closing the opening 7311.
Other configurations of the sending unit 731 will be described in detail later.

  The delivery unit 732 has an opening 7321 that opens into the first air guide 73, and the cooling gas circulated when the valve V <b> 2 opens the first air guide 73 through the opening 7321. The light is transmitted to the light emitting unit 511 from the + X direction side. In addition, although the sending part 732 does not have a valve, when the valve V2 closes the first air guide part 73, a valve that closes the opening part 7321 may be provided.

[Configuration of second air guide section]
Similarly to the first air guide part 73, the second air guide part 74 includes sending parts 741 and 742 that send the cooling gas flowing through the second air guide part 74 to the light emitting part 511, and a valve V4. Have.
The sending section 741 is located on the −X direction side with respect to the arc tube 51 when the first housing 6A is viewed from the −Z direction side, and emits the cooling gas flowing through the second air guide section 74 from the −X direction side. To the unit 511.
Similarly, when the first housing 6A is viewed from the −Z direction side, the delivery unit 742 is positioned on the −Y direction side with respect to the arc tube 51, and the cooling gas that has circulated through the second air guide unit 74 is viewed from the −Y direction side. Send to the light emitting unit 511.

The valve V4 is located between the sending parts 741 and 742 in the flow path of the cooling gas flowing through the second air guiding part 74, and the cooling gas introduced into the second air guiding part 74 is sent to the sending part 741, 742 has a function of leading to any one of 742.
Specifically, the valve V4 is a shielding plate whose one end is rotatably supported on a surface 74A on the opposite side of the second air guide portion 74 from the arc tube 51 side. The valve V4 rotates about the one end to the -Y direction side on the + X direction side by its own weight, and the other end is a surface 74B opposite to the surface 74A (the surface 74B on the arc tube 51 side, and the inner wall When contacting the surface 74B that forms a part of the part 6A1, the second air guide part 74 is closed (shielded), whereby the cooling gas is guided to the delivery part 741. Further, when the valve V4 is rotated to the + Y direction side on the −X direction side and the other end of the valve V4 comes into contact with the surface 74A, the second air guide portion 74 is opened, and thereby the cooling gas is sent out. Guided to part 742.
A recess 743 (second recess) similar to the recess 733 is formed on the surface 74A on which the valve V4 is supported. When the second air guide portion 74 is opened, the valve V4 is disposed in the recess 743, so that the cross-sectional area of the second air guide portion 74 is suppressed from being reduced by the valve V4. The occurrence of pressure loss of the cooling air due to hitting the valve V4 is suppressed.
The contact portion of the free end of the valve V4 on the surface 74B (the end opposite to the rotation shaft side) is set at the edge of the opening 7411 in the delivery portion 741.

The sending part 741 has an opening 7411 (first opening) that opens into the second air guide part 74 and a valve V5 that opens and closes the opening 7411.
The opening 7411 is an opening through which the cooling gas flowing through the second air guiding unit 74 passes, and sends the cooling gas to the light emitting unit 511 from the −X direction side.
The valve V5 is constituted by a plurality of shielding plates PL as in the case of the valve V3, and is constituted by two shielding plates PL in the present embodiment. One end of each of the shielding plates PL is rotatably supported by the edge of the opening 7411 and is rotated by its own weight. Then, these shielding plates PL rotate to one side (on the −Y direction side and the terminal end side of the second air guide portion 74) and are arranged along the flow direction of the cooling gas passing through the opening 7411. Then, the opening 7411 is opened, and the cooling gas can pass through the opening 7411. On the other hand, the shielding plate PL is rotated to the other side (on the + Y direction side, the base end side of the second air guide portion 74), and the distal end portion of the one shielding plate PL (the end opposite to the rotating shaft side). Part) is in contact with the inner wall of the opening 7411, and the tip of the other shielding plate PL is in contact with the end of the one shielding plate PL on the rotating shaft side, whereby the opening 7411 is closed.

  The delivery part 742 has an opening 7421 that opens into the second air guide part 74, and the cooling gas that is circulated when the valve V4 opens the second air guide part 74 passes through the opening 7421. -Sent to the light emitting unit 511 from the Y direction side. As with the sending part 732, the sending part 742 does not have a valve, but a valve that closes the opening 7421 when the valve V4 closes the second air guiding part 74 may be provided.

[Projector installation orientation]
The projector 1 shown in FIG. 1 can be installed in each of a normal posture, a reverse posture, an upper projection posture, and a lower projection posture by using an installation stand or an installation tool.
The normal placement posture is a posture when placed on the installation table. That is, in the normal placement posture, the bottom surface portion 22 faces the lower side in the vertical direction, the projection direction of the image light by the projection optical device 44 is along the substantially horizontal direction, and the projected surface is along the vertical plane. It is a posture projected on the top.
The reverse placement posture is a posture when placed on a ceiling or the like using an installation tool or the like, and is a so-called ceiling suspension posture. That is, in the reverse orientation, the bottom surface portion 22 faces the upper side in the vertical direction, the projection direction of the image light by the projection optical device 44 is along the horizontal direction, and the image light is on the projection surface along the vertical plane. It is a projected posture.
In the upper projection posture, the bottom surface portion 22 faces the horizontal direction, the projection direction of the image light by the projection optical device 44 faces the upper side in the vertical direction, and the image light is projected onto the projection surface along the horizontal plane such as the ceiling. It is a posture.
In the lower projection posture, the bottom surface portion 22 faces the horizontal direction, the projection direction of the image light by the projection optical device 44 faces the lower side in the vertical direction, and the image light is on the projection surface along the horizontal plane such as the floor. It is a projected posture.
Among these postures, even when the projector 1 is installed in any posture, the + Z direction, which is the traveling direction of the light emitted from the light source device 5, is a direction along the horizontal direction.

[Cooling gas flow path in normal position]
When the projector 1 is installed in the above-described normal posture, the sending unit 731 of the first air guide unit 73 is positioned on the upper side in the vertical direction with respect to the arc tube 51 as illustrated in FIG. 9.
In this posture, the valve V <b> 1 provided in the branching portion 72 rotates in the −Y direction side on the −X direction side to open the first air guiding portion 73 and close the second air guiding portion 74. For this reason, the cooling gas introduced into the duct part 7 through the inlet 71 flows into the first air guide part 73. In this posture, the valve V2 rotates to close the first air guide 73, and the valve V3 of the delivery unit 731 opens the opening 7311.
As a result, the cooling gas that has flowed into the first air guide portion 73 passes through the opening 7311 of the delivery portion 731 as shown by an arrow A1 in FIG. In FIG. 3, the light is sent from the upper side in the vertical direction to the light emitting tube 51 toward the light emitting unit 511. Accordingly, the cooling gas is blown to the upper part in the vertical direction of the light emitting unit 511, and the upper part is actively cooled.

[Cooling gas flow path in reverse orientation]
FIG. 10 is a view of a cross section of the container 6 in the above-described inverted posture as viewed from the −Z direction side.
When the projector 1 is installed in the above-described reverse orientation, the sending unit 742 of the second air guide unit 74 is positioned above the arc tube 51 in the vertical direction as illustrated in FIG. 10.
In this posture, the valve V1 rotates to the + Y direction side on the + X direction side to open the second air guiding portion 74 and close the first air guiding portion 73. For this reason, the cooling gas introduced into the duct portion 7 through the introduction port 71 flows into the second air guide portion 74. In this posture, the valve V4 rotates to open the second air guide portion 74, and the valve V5 of the delivery portion 741 closes the opening 7411. At this time, of the two shielding plates PL constituting the valve V5, one shielding plate PL is further rotated by the end portion on the opposite side to the rotating shaft side coming into contact with the edge of the opening 7411. The other shielding plate PL is restricted from further rotation by contacting the end of the one shielding plate PL on the rotating shaft side.
As a result, the cooling gas that has flowed into the second air guide portion 74 flows along the second air guide portion 74 as shown by the arrow A2 in FIG. Then, the light is sent out toward the light emitting unit 511 from the −Y direction side, that is, from the upper side in the vertical direction with respect to the light emitting tube 51 in the inverted posture. Accordingly, the cooling gas is blown to the upper part in the vertical direction of the light emitting unit 511, and the upper part is actively cooled.

[Cooling gas flow path in upper projection position]
FIG. 11 is a view of a cross section of the container 6 in the upper projection posture as viewed from the −Z direction side.
When the projector 1 is installed in the upper projection posture, the sending unit 741 of the second air guide unit 74 is positioned on the upper side in the vertical direction with respect to the arc tube 51 as shown in FIG.
In this posture, the valve V <b> 1 rotates in the + X direction side to the + Y direction side to open the second air guiding portion 74 and close the first air guiding portion 73, so that the duct portion 7 is connected via the introduction port 71. The cooling gas introduced into the inside flows into the second air guide portion 74. In this posture, the valve V4 rotates to close the second air guide portion 74, and the valve V5 of the delivery portion 741 opens the opening 7411.
As a result, the cooling gas that has flowed into the second air guide portion 74 passes through the opening 7411 of the delivery portion 741 as shown by an arrow A3 in FIG. In the posture, the light is sent from the upper side in the vertical direction to the light emitting tube 51 toward the light emitting unit 511. Accordingly, the cooling gas is blown to the upper part in the vertical direction of the light emitting unit 511, and the upper part is actively cooled.

[Cooling gas flow path in lower projection position]
FIG. 12 is a view of a cross section of the container 6 in the lower projection posture as viewed from the −Z direction side.
When the projector 1 is installed in the lower projection posture, the sending unit 732 of the first air guiding unit 73 is located on the upper side in the vertical direction with respect to the arc tube 51 as shown in FIG.
In this posture, the valve V1 rotates on the −X direction side in the −Y direction side to open the first air guide portion 73 and close the second air guide portion 74. For this reason, the cooling gas introduced into the duct portion 7 via the introduction port 71 flows into the first air guide portion 73. Further, in this posture, the valve V2 rotates to open the first air guide portion 73, and the valve V3 of the sending portion 731 closes the opening 7311. At this time, as in the case of the valve V5, of the two shielding plates PL constituting the valve V3, one shielding plate PL has an end opposite to the rotating shaft side at the edge of the opening 7311. Further rotation is restricted by abutting on the other shield plate PL, and further rotation of the other shielding plate PL is regulated by contacting the end portion of the one shielding plate PL on the rotation axis side.
As a result, the cooling gas that has flowed into the first air guiding portion 73 flows along the first air guiding portion 73 and passes through the opening 7321 of the sending portion 732 as indicated by an arrow A4 in FIG. Thus, the light is sent out toward the light emitting unit 511 from the + X direction side, that is, from the upper side in the vertical direction with respect to the light emitting tube 51 in the lower projection posture. Accordingly, the cooling gas is blown to the upper part in the vertical direction of the light emitting unit 511, and the upper part is actively cooled.

As described above, when the valves V1 to V5 are rotated by their own weights, the sending unit located among the sending units 731, 732, 741, and 742 on the upper side in the vertical direction with respect to the arc tube 51 in the posture in which the projector 1 is installed. Then, the cooling gas is introduced. Then, the cooling gas is sent from the upper side in the vertical direction to the light emitting unit 511 via the sending unit, so that the upper part in the vertical direction of the light emitting unit 511 can be efficiently cooled.
In addition, the cooling gas which cooled the arc_tube | light_emitting_tube 51 is discharged | emitted out of the container 6 through the said opening part 6D1 and the discharge port 631, as shown by arrow A5 in FIGS.

[Configuration of shielding plate]
FIG. 13 is a perspective view showing the shielding plate PL.
Here, the shielding plate PL constituting the valves V3 and V5 will be described.
As shown in FIG. 13, the shielding plate PL is configured by bending a part of a plate formed in a T shape. The shielding plate PL is a main body part PL1 having a substantially rectangular shape in plan view, and an axis that is located on one end side of the main body part PL1 and projects toward the outside of the main body part PL1 along the short direction of the main body part PL1. Part PL2 and bending part PL3 located in the other end side in main part PL1.
Shaft portion PL2 is a portion that is rotatably supported by the edges of openings 7311 and 7411, and extends in opposite directions on one end side of main body portion PL1.
The bent portion PL3 is a portion where the plate body is bent by, for example, hemming (tight hemming) or the like. The bent part PL3 biases the center of gravity of the shielding plate PL toward the bent part PL3 side by making the bent part PL3 side heavier than the shaft part PL2 side in the main body part PL1, and thereby the attitude of the projector 1 This is a part for facilitating the rotation of the shielding plate PL in accordance with a change (that is, a change in posture of the light source device 5). Therefore, by providing a weight in place of the bent portion PL3 or by forming the end of the main body portion PL1 opposite to the shaft portion PL2 side to be larger or thicker, the center of gravity of the shielding plate PL is increased to the shaft portion PL2. It may be biased to the opposite side to the side.

[Configuration of sending section of first air guide section]
FIG. 14 is a perspective view showing the sending part 731 of the first air guiding part 73. 15 is a view of the cross section along the XY plane of the sending portion 731 seen from the −Z direction side, and FIG. 16 is a view showing the cross section along the YZ plane of the sending portion 731. In other words, It is a figure which shows the flow path of the cooling gas which distribute | circulates the sending part.
As shown in FIGS. 14 to 16, the sending section 731 of the first air guiding section 73 has a recess 7312 in which a part of the opening 7311 is located in addition to the opening 7311.
The recessed portion 7312 is formed in the inner surface portion 73C on the + Z direction side of the inner surface portion constituting the first air guide portion 73 so as to be recessed on the + Z direction side. The recess 7312 is along the XY plane and forms the edge of the opening 7311 on the + Z direction side, and the wall 7313 is along the YZ plane and forms the edge of the opening 7311 on the + X direction side. It is comprised by the wall part 7314 and the wall part 7315 which forms the edge of the -X direction side of the opening part 7311 along a YZ plane. In addition, the wall portion 7313 is a wall portion orthogonal to the + Z direction, and the wall portions 7314 and 7315 are wall portions orthogonal to the circumferential direction centering on the central axis of the arc tube 51.
The opening 7311 partially located in the recess 7312 is shifted in the + Z direction side with respect to the central axis of the cooling gas flowing through the first air guide portion 73. That is, the opening 7311 is disposed across the first air guide 73 and the recess 7312.

Each wall part 7313-7315 is further extended from the edge of the opening part 7311 to the -Y direction side, and these wall parts 7313-7315 are the wall part 7316 along the XZ plane, ie, the opening surface of the opening part 7311. And is connected to a wall portion 7316 facing each other. Of the two shielding plates PL supported by the edge of the opening 7311, the wall portion 7316 abuts the end portion on the bent portion PL3 side of the shielding plate PL located on the −X direction side, and A restricting portion 7317 (FIGS. 14 and 15) for restricting further rotation of the shielding plate PL is provided in a protruding manner.
The wall portion 7316 further extends in the −Z direction from a position corresponding to the edge on the −Z direction side of the opening 7311. In other words, the wall portion 7316 is located at a position corresponding to the opening portion 7311 and on the inner side (the arc tube 51 side) from the inner surface portion 73B. And the opening part 7318 in which an edge is formed by these wall parts 7316, 7314, and 7315 and the inner surface part 73B in which the opening part 7311 was formed is opened to the -Z direction side.

The opening 7318, together with the opening 7311, communicates the space in the first air guide 73 and the space in the housing 6 in which the arc tube 51 is disposed. Then, when the opening 7311 is opened, the opening 7318 sends out the cooling gas that has passed through the opening 7311 toward the arc tube 51 (light emitting unit 511).
That is, the delivery unit 731 configures a duct in a substantially horizontal U shape (that is, a substantially C shape) in which the cooling gas that has circulated through the first air guide portion 73 flows when viewed from the −X direction side. When only the flow path through which the cooling gas that has passed through the opening 7311 is delivered from the opening 7318, the delivery unit 731 constitutes a substantially L-shaped duct as viewed from the −X direction side.

[Flow path of cooling gas in delivery section of first air guide section]
Hereinafter, the flow path of the cooling gas delivered to the arc tube 51 via the delivery unit 731 will be described.
The cooling gas that has flowed through the first air guiding portion 73 along the + X direction and led to the sending portion 731 is, as indicated by an arrow A6 in FIG. 16, the valve V2, from the + X direction side to the + Z direction side (wall). The distribution direction is changed to (part 7313 side). And the said cooling gas distribute | circulates to the -Y direction side along each wall part 7313-7315, and passes the opening part 7311. FIG.
The cooling gas that has passed through the opening 7311 hits the wall 7316 located on the −Y direction side (the arc tube 51 side) with respect to the opening surface of the opening 7311, and the flow direction is changed to the −Z direction side. Then, the cooling gas flows along the wall portion 7316 toward the −Z direction side, and flows through the opening 7318 from the upper side in the vertical direction to the arc tube 51 (particularly, the light emitting portion 511).

As described above, the cooling gas passing through the delivery unit 731 flows in a substantially U shape in the horizontal direction when viewed from the −X direction side, thereby allowing the cooling gas to flow toward the light emitting unit 511 without being diffused. The cooling gas can be circulated to the light emitting unit 511 from the upper side in the vertical direction with high accuracy. Therefore, the upper part of the light emitting unit 511 in the vertical direction is efficiently cooled.
Specifically, since the opening 7311 and the light emitting unit 511 are separated from each other in the + Z direction, when the cooling gas is sent from the opening 7311 toward the light emitting unit 511, the cooling gas is easily diffused. On the other hand, after the cooling gas flowing along the + X direction in the first air guide portion 73 is once guided to the + Z direction side by the valve V2 and passed through the opening portion 7311, the wall portion 7316 causes the −Z direction side. The cooling gas is guided to the light emitting portion 511 in a state where the cooling gas is aligned. Thereby, the said cooling gas can be distribute | circulated to the light emission part 511 accurately, and the upper part of the light emission part 511 is cooled efficiently.
In the other delivery parts 732, 741, 742, the openings 7321, 7421, 7422 are arranged along the circumferential direction centering on the central axis of the arc tube 51 with the duct part 7 (the first air guide part 73 or the first airflow part 73). Although it is not off-center with respect to the central axis of the cooling gas flowing through the two air guide portions 74), it is configured as a substantially L-shaped duct as with the delivery portion 731. Thereby, the cooling gas is sent from the sending parts 732, 741, and 742 to the light emitting part 511 as in the case of the sending part 731.

[Effects of projector]
The light source device 5 includes an arc tube 51 and a container 6 that emits light emitted from the accommodated arc tube 51 in the + Z direction that is the first direction. The container 6 has a duct portion 7 disposed along a circumferential direction centering on the central axis of the arc tube 51. And the duct part 7 is the introduction part 71 which introduce | transduces cooling gas into the said duct part 7, the inner surface part 73B (equivalent to the inner surface part of this invention) which covers the arc tube 51 along the said circumferential direction, and introduction A delivery unit 731 (corresponding to the first delivery unit of the present invention) for delivering the cooling gas introduced from the port 71 to the arc tube 51. Among these, the sending portion 731 is located on the + Z direction side of the light emitting portion 511 located at the center of the arc tube 51 and is formed with an opening 7311 formed by an edge along the inner surface portion 73B (in the opening portion of the present invention). And a wall portion 7316 (corresponding to the wall portion of the present invention) located on the arc tube 51 side from the inner surface portion 73B according to the opening portion 7311. When the sending part 731 is positioned on the upper side in the vertical direction with respect to the arc tube 51, the cooling gas introduced from the introduction port 71 and flowing through the first air guide part 73 flows in the circumferential direction along the inner surface part 73B. Then, it circulates in the + Z direction, passes through the opening 7311, circulates in the −Z direction side along the wall 7316, and is sent to the arc tube 51.
According to this, after the cooling gas that has circulated along the circumferential direction is circulated to the + Z direction side by the first delivery part 731, the cooling gas is turned back to the −Z direction side, whereby the cooling gas is supplied to the arc tube 51. It can be made easier to point. Accordingly, since the cooling gas can be easily circulated through the arc tube 51, the arc tube 51 can be efficiently cooled.

  The first air guide part 73 of the duct part 7 has a sending part 732 as a second sending part that sends the cooling gas introduced from the introduction port 71 to the arc tube 51 from a direction different from the sending part 731. Furthermore, the duct part 7 has the 2nd wind guide part 74 which has the sending parts 741 and 742 which send cooling gas to the arc_tube | light_emitting_tube 51 from a different direction, respectively. According to this, it is possible to selectively send the cooling gas to the arc tube 51 from the feed unit located on the upper side in the vertical direction with respect to the arc tube 51 among the feed units 731, 732, 741, and 742. Therefore, as described above, the upper portion in the vertical direction of the arc tube 51 that tends to be high in the arc tube 51 (the upper portion in the vertical direction in the light emitting unit 511) can be effectively cooled by the cooling gas delivered from the upper side in the vertical direction.

The duct portion 7 is located between the sending portions 731 and 732 in the first air guide portion 73 and serves as a first opening / closing member that opens and closes the first air guide portion 73 according to the attitude of the projector 1 (light source device 5). And a valve V3 as a second opening / closing member that opens and closes the delivery portion 731 located on the upstream side of the flow path of the cooling gas in the first air guide portion 73. According to this, when the valve V2 opens the first air guide portion 73, the valve V3 can close the delivery portion 731. Thereby, the cooling gas is supplied to the delivery portion 732 located on the downstream side of the flow path. Can be guided reliably. Therefore, when the delivery unit 732 is positioned above the arc tube 51 in the vertical direction, the cooling gas can be reliably delivered to the arc tube 51 via the delivery unit 732.
Further, when the sending unit 731 is positioned above the arc tube 51 in the vertical direction, the valve V2 closes the first air guiding unit 73 and the valve V3 opens the sending unit 731, thereby the sending unit 731. Thus, the cooling gas can be reliably guided. Therefore, the cooling gas can be reliably delivered to the arc tube 51 via the delivery unit 731.
As described above, the cooling gas can be reliably circulated to any one of the delivery units 731 and 732 in accordance with the posture of the light source device 5, and the cooling gas can be reliably delivered from the delivery units 731 and 732 to the arc tube. .

The valve V3 that opens and closes the delivery portion 731 has a plurality of shielding plates PL, and each shielding plate PL has a shaft portion PL2 that is rotatably supported on the inner surface portion 73A of the first air guide portion 73 on one end side. Each of them has its own weight and rotates around the shaft PL2 to open and close the opening 7311.
Here, as a configuration for opening and closing the delivery portion 731, it is conceivable to open and close either the opening 7311 or the opening 7318 in which a part of the edge is formed by the wall portion 7316. However, since the opening 7318 is located on the downstream side of the flow path with respect to the opening 7311 in the delivery part 731, when closing the opening 7318, a part of the cooling gas flowing through the first air guide part 73. Circulates and stays up to the opening 7318, and the flow rate of the cooling gas circulated to the delivery part 732 is reduced.
On the other hand, since the opening 7311 is opened and closed by the shielding plate PL included in the valve V3, it is possible to prevent the cooling gas from flowing to the opening 7318 when the delivery unit 731 is closed. Therefore, the occurrence of the stagnation can be suppressed, and a decrease in the flow rate of the cooling gas flowing through the delivery unit 732 can be suppressed.

  The valve V3 has two shielding plates PL, and the shaft portions PL2 are supported on the edge of the opening 7311 in the two shielding plates PL. When the valve V3 closes the opening 7311 of the delivery unit 731, one of the plurality of shielding plates PL (two shielding plates PL) constituting the valve V3 is rotated by its own weight. Thus, the portion on the opposite side to the shaft portion PL2 comes into contact with the portion on the shaft portion PL2 side in the other shielding plate PL. According to this, the shaft part PL2 of each shielding plate PL constituting the valve V3 is supported on the edge of the opening 7311, so that the opening 7311 can be reliably opened and closed by the two shielding plates PL. Further, the portion of the shielding plate PL on the + X direction side opposite to the shaft portion PL2 side comes into contact with the portion on the shaft portion PL2 side of the shielding plate PL on the −X direction side, thereby reliably closing the opening 7311. it can. Accordingly, since the cooling gas can be prevented from flowing into the opening 7311 when the delivery unit 731 is closed, the flow rate of the cooling gas flowing through the delivery unit 732 can be suppressed from being reduced. The same applies to the plurality of shielding plates PL (two shielding plates PL) constituting the valve V5.

  The projector 1 can be installed in the above-described normal posture in which the sending unit 731 is vertically above the arc tube 51. According to this, at the time of the regular placement posture, the cooling gas can be circulated to the upper part in the vertical direction of the arc tube 51 and thus to the upper part in the vertical direction of the light emitting part 511 through the delivery unit 731. . Therefore, the arc tube 51 can be efficiently cooled, and the lifetime of the arc tube 51 can be reliably increased.

[Modification of Embodiment]
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
In the above embodiment, the projector 1 can be installed in each of the normal posture, the reverse posture, the upper projection posture, and the lower projection posture. However, the present invention is not limited to this. That is, the projector 1 only needs to be installed in at least one of these postures. And the delivery part located in the vertical direction upper side with respect to the arc tube 51 has the same configuration as the inner surface part 73B, the opening part 7311, and the wall part 7316, respectively, so that the same effect as described above can be obtained. it can.
Further, a part of the edge of the opening 7311 may not be formed by the inner surface portion 73B. That is, the opening 7311 and the inner surface 73B may be separated.

  In the above embodiment, the center of the opening 7311 in the delivery unit 731 is shifted in the + Z direction with respect to the central axis of the first air guide 73 with respect to the flow direction of the cooling gas. However, the present invention is not limited to this. For example, even if the center of the opening 7311 is located at the center in the width direction (+ Z direction) of the first air guide 73, that is, on the central axis of the cooling gas flowing through the first air guide 73. Good. Further, as described above, the configuration of the sending unit 731 may be applied to at least one of the sending units 732, 741, and 742. That is, even when the projector 1 is installed in another posture among the above four postures, the configuration of the sending portion 731 may be applied to the sending portion positioned on the upper side in the vertical direction with respect to the arc tube 51. Good.

  In the above-described embodiment, the first air guide portion 73 having the sending portion 731 has the sending portion 732 positioned downstream of the flow path with respect to the sending portion 731, and the sending portion 732 is a projector in the lower projection posture. When 1 is installed, it is assumed to be positioned on the upper side in the vertical direction with respect to the arc tube 51. However, the present invention is not limited to this. For example, when the projector 1 is configured not to be installed in the lower projection posture, the sending unit 732 may not be provided. Similarly, when the projector 1 has a configuration that cannot be installed in the reverse orientation, the sending unit 742 may not be provided. When the projector 1 has a configuration that cannot be installed in the upper projection posture, the sending unit 741 may not be provided. Good. Furthermore, when the projector 1 has a configuration that cannot be installed in either the upside-down posture or the upper-side projection posture, the second air guide portion 74 may not be provided, and the branching portion 72 and the valve V1 may not be provided.

  In the above embodiment, the first air guide portion 73 is located between the sending portions 731 and 732, closes the first air guide portion 73 and flows the cooling gas flowing into the first air guide portion 73 into the sending portion 731. The valve V2 as a first opening / closing member that opens the first air guide portion 73 and guides the cooling gas to the delivery portion 732 is provided. Further, the sending part 731 of the first air guiding part 73 has a valve V3 as a second opening / closing member that opens and closes the opening 7311 of the sending part 731. However, the present invention is not limited to this. That is, as described above, when there is no sending part 732, these valves V2 and V3 may be omitted. Further, the configuration of these valves V2 and V3 is not limited to the above, and the configuration can be appropriately changed.

  In the above embodiment, the valves V <b> 1 to V <b> 5 are rotated by their own weight, and are shielded to open / close any one of the first air guiding portion 73 and the second air guiding portion 74, or any one of the sending portions 731 and 741. It is assumed that it is composed of a plate. However, the present invention is not limited to this. That is, each valve is not limited to a configuration that moves due to its own weight. For example, the vertical direction of the projector 1 is detected, and the first air guide unit 73 is controlled under the control of the control device based on the detection result of the direction. The second air guide unit 74 and the sending units 731 and 741 may be opened and closed.

  In the above embodiment, the shielding plate PL has a configuration in which the position of the center of gravity is biased to a portion opposite to the shaft portion PL2 by forming the bent portion PL3 on the side opposite to the shaft portion PL2 side. did. However, the present invention is not limited to this. For example, as described above, a weight may be provided at the opposite portion, and the center of gravity may be biased by increasing the thickness dimension of the opposite portion.

In the above embodiment, the area of the opening surface of the opening 7318 as the second opening included in the sending portion 731 is set smaller than the area of the opening surface of the opening 7311 as the first opening. However, the present invention is not limited to this, and may have the same area, and the area of the opening surface of the opening 7311 may be smaller than the area of the opening surface of the opening 7318.
In addition, the edge shape of the opening 7318 may be a shape in which the cross-sectional area becomes smaller as it goes in the flow direction of the cooling gas passing through the opening 7318.

  In the above-described embodiment, the image projection device 4 includes a plurality of lenses 441, an aspherical mirror 442 that reflects light that has passed through the plurality of lenses 441, and a holding optical body 443 that accommodates them. The apparatus 44 is provided. That is, the projection optical device 44 has a configuration in which the traveling direction of the incident light is folded and emitted. However, the present invention is not limited to this. For example, a projection optical device 44 that does not have an aspherical mirror 442 and emits incident light along the incident direction of the light may be employed.

In the above embodiment, the projector 1 is configured to include the three light modulation devices 433 (433R, 433G, and 433B). However, the present invention is not limited to this. For example, the present invention can be applied to a projector having two or less or four or more light modulation devices 433.
In the above embodiment, the image projection device 4 has been described as having a substantially L-shaped configuration in plan view. However, the configuration is not limited thereto, and for example, a configuration having a substantially U-shaped configuration in plan view may be employed.
In the above embodiment, a transmissive liquid crystal panel having a light incident surface and a light exit surface different from each other is used as the light modulation device 433. However, instead of the transmissive liquid crystal panel, a reflective liquid crystal panel having the same light incident surface and light emitting surface may be used. In addition, as long as the light modulation device can modulate an incident light beam and form an image according to image information, a device using a micromirror, for example, a device using a DMD (Digital Micromirror Device) or the like can be used. A light modulation device may be used.

In the above embodiment, the light source device 5 includes the arc tube 51, the main reflecting mirror 52, the collimating lens 53, and the container 6. A plurality of such light source devices 5 may be employed in the projector. Further, the main reflecting mirror 52 and the sub reflecting mirror 514 may be omitted.
In the above embodiment, an example in which the light source device of the present invention is applied to a projector has been described. However, the present invention is not limited to this. For example, the light source device may be applied to an illumination device such as a spotlight that can move the irradiation range position of light.

  DESCRIPTION OF SYMBOLS 1 ... Projector 433 (433B, 433G, 433R) ... Light modulation device, 44 ... Projection optical device, 5 ... Light source device, 51 ... Light emitting tube, 6 ... Housing, 6A ... 1st housing | casing, 6A1 ... Inner wall part, 6C: Duct forming member, 6D: Shading member, 6D1: Opening part, 61: Top surface part, 63: Left side part, 631 ... Discharge port, 64 ... Right side part, 7 ... Duct part, 71 ... Inlet port, 72 ... Branching part 73 ... First air guide portion, 73A, 73C ... Inner surface portion, 73B ... Inner surface portion, 731 ... Sending portion (first sending portion), 7311 ... Opening portion, 7313 ... Wall portion, 7314 ... Wall portion, 7315 ... Wall Part 7316 ... wall part 7317 ... restriction part 7318 ... opening part 732 ... sending part (second sending part), 74 ... second air guide part, PL ... shielding plate, PL2 ... shaft part, S ... space, V1 ... Valve, V2 ... Valve (first opening / closing member), V3 ... Valve (second opening) Member), V5 ... valve.

Claims (7)

A light source device used by being incorporated in a projector provided with a cooling device that sends out a cooling gas,
Arc tube,
A container that houses the arc tube and emits light emitted from the arc tube in a first direction;
The container has a duct portion arranged along a circumferential direction around the central axis of the arc tube,
The duct part is
An inlet for introducing a cooling gas into the duct portion;
An inner surface along the circumferential direction;
A first delivery section for delivering the cooling gas introduced from the introduction port to the arc tube,
The first sending unit
An opening formed by an edge along the inner surface, located closer to the first direction than the center of the arc tube;
A wall portion located on the arc tube side from the inner surface portion according to the opening,
The cooling gas introduced from the introduction port circulates in the circumferential direction along the inner surface portion, then circulates in the first direction, passes through the opening portion, and passes along the wall portion. A light source device that circulates in a direction opposite to the direction and is sent to the arc tube. The light source device according to claim 1,
The light source device, wherein the duct part includes a second sending part that sends the cooling gas introduced from the introduction port to the arc tube from a direction different from that of the first sending part. The light source device according to claim 2,
The duct part is
A first opening / closing member that is located between the first delivery part and the second delivery part in the duct part, and that opens and closes the duct part according to a posture;
A light source device, comprising: a second opening / closing member that opens and closes a delivery part located upstream of the cooling gas flow path among the first delivery part and the second delivery part. The light source device according to claim 3.
The second opening / closing member opens and closes the first delivery part,
The second opening / closing member has a shaft portion that is pivotally supported by the duct portion on one end side, and has a shielding plate that rotates around the shaft portion by its own weight and opens and closes the opening portion. A light source device. The light source device according to claim 4,
The second opening / closing member has a plurality of the shielding plates,
The plurality of shielding plates, the shaft portion is supported on the edge of the opening,
At least one of the plurality of shielding plates is rotated by its own weight, and a portion opposite to the shaft portion is in contact with a portion on the shaft portion side of another shielding plate. apparatus. The light source device according to any one of claims 1 to 5,
A light modulation device that modulates light emitted from the light source device;
And a projection optical device that projects light modulated by the light modulation device. The projector according to claim 6,
The projector is configured to be installed in a posture in which the first sending unit is vertically above the arc tube.

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