JP2012194461A - Light source device and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light source device obtaining a long service life for an arc tube.SOLUTION: The light source device 4 includes: the arc tube having a light emission section with a pair of electrodes arranged inside; a mirror reflector for reflecting an optical flux emitted from the light emission section and converging it to a prescribed position; a cylindrical body 82 provided in the front side of the light emission of the mirror reflector; and a translucent member 6 having the flux reflected by the mirror reflector transmitted. The cylindrical body 82 includes side wall sections 83 surrounding the arc tube and a front wall section 84 arranged in the front side of the light emission in the cylindrical body 82 and connecting with the side wall sections 83. The front wall section 84 has: an opening section 85 to which the translucent member 6 is fitted; a communication opening 88 which communicates the interior and exterior of the cylindrical body 82; and a rectifying section 89 for rectifying the air conducted inside the cylindrical body 82 through the communication opening 88 toward a light emission section.

Description

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

Conventionally, as a light source device mounted on a projector, an arc tube having a light emitting part in which a pair of electrodes are arranged, and a reflecting mirror (ellipsoidal reflector) that reflects a light beam emitted from the light emitting part and converges it at a predetermined position And a parallel lens that collimates the light beam reflected by the reflecting mirror is known (see, for example, Patent Document 1).
In the light source device described in Patent Document 1, in order to extend the life of the arc tube, a cooling structure that blows cooling air to the upper portion of the light emitting unit is employed.
Specifically, the light source device described in Patent Document 1 includes a cylindrical body (housing body main body) that is provided on the light emission front side of the reflecting mirror and integrates the reflecting mirror to which the arc tube is attached and the collimating lens. Prepare.
This cylindrical body extends along the center line of the arc tube (the optical axis of the light beam emitted from the light source device) and surrounds the arc tube (upper, lower, left, right side), and light is emitted from the side wall. A front wall portion (front surface portion) to which the collimating lens is attached.
And the opening part which connects the inside and outside of a cylinder body is formed in a side wall part, and air is blown on the light emission part upper part by introducing air into the inside of a cylinder body through the said opening part.

JP 2010-107574 A

By the way, the arc tube is attached to the reflecting mirror so that the emission center (substantially the center position between the pair of electrodes) is located at the first focal point of the reflecting mirror (elliptical reflector). That is, the light emitting part and the opening formed in the cylindrical body are in a state of being separated by a predetermined distance.
For this reason, in order to blow air to the upper part of the light emitting part through the opening, the rectifying structure that rectifies the air introduced into the cylinder through the opening toward the upper part of the light emitting part It may be provided inside the body.

Further, when the reflecting mirror is composed of an ellipsoidal reflector, a space that does not interfere with the optical path of the light beam reflected by the reflecting mirror (hereinafter referred to as a non-interfering space) within the cylindrical body is included in the reflecting mirror. The closer it is, the smaller it becomes.
And in the light source device described in patent document 1, the opening part is formed in the side wall part close | similar to a reflective mirror. That is, since the non-interference space is small on the side close to the reflecting mirror, when the rectifying structure is provided inside the cylindrical body, a small size adapted to the non-interfering space so as not to block the light beam reflected by the reflecting mirror. It is necessary to have a rectifying structure. When the rectifying structure is small in this way, the rectifying structure cannot have a good rectifying effect.
Therefore, there is a problem that it is difficult to blow air well on the upper part of the light emitting unit, and it is difficult to extend the life of the arc tube.

  An object of the present invention is to provide a light source device and a projector that can extend the life of the arc tube.

The light source device of the present invention is a light source device including an arc tube having a light emitting part in which a pair of electrodes are disposed inside, and a reflecting mirror that reflects a light beam emitted from the light emitting part and converges it at a predetermined position. A cylindrical body provided on the light emission front side of the reflecting mirror; and a translucent member that transmits the light beam reflected by the reflecting mirror; and the cylindrical body includes a side wall that surrounds the arc tube. A front wall portion that is provided on the front side of the cylindrical body and connected to the side wall portion, the front wall portion having an opening into which the translucent member is fitted, And a rectifying unit that rectifies air introduced into the cylindrical body through the communication port toward the light emitting unit.
Here, the light emission front side means the side on which the light beam reflected by the reflecting mirror travels. On the other hand, the rear side of light emission means the side opposite to the front side of light emission.

In the present invention, in the cylindrical body constituting the light source device, the above-described communication port and the rectifying unit are provided on the front wall portion that is separated from the reflecting mirror and to which the translucent member is attached.
That is, in the cylindrical body, the side away from the reflecting mirror has a larger non-interference space compared to the side close to the reflecting mirror, so compared with the configuration in which the communication port and the rectifying unit are provided on the side wall, A large-sized rectification | straightening part can be provided in a cylinder inside.
Therefore, a good rectifying effect can be given to the rectifying unit, and air can be blown well to the upper part of the light emitting unit to extend the life of the arc tube.

In the light source device of the present invention, the communication port includes first to fourth communication ports provided at respective positions on the top, bottom, left, and right of the center line when viewed from the direction along the center line of the arc tube. The apparatus includes a duct that guides air to each of the first to fourth communication ports, and a flow path switching mechanism that switches a flow path inside the duct, and the duct extends in a circumferential direction of the cylindrical body, and the side wall A first main duct and a second main duct through which air is circulated in a direction away from each other along the portion; and air circulated through the first main duct is circulated along the front wall portion, A first sub-duct and a second sub-duct that respectively lead to the first communication port and the second communication port that are adjacent to each other in the circumferential direction, and air circulated through the second main duct along the front wall portion Circulate, the third communication port and the fourth communication port It is preferable to provide a third sub-duct and the fourth sub-ducts lead respectively.
Here, the first and second communication ports are communication ports that are adjacent to each other in the circumferential direction of the cylindrical body (the rotation direction around the center line of the arc tube). That is, for example, when the first communication port is located above the center line when viewed from the direction along the center line of the arc tube, the second communication port is located on the left or right side of the center line. It is.

In this invention, the 1st-4th communicating port is formed in each position mentioned above in the front wall part.
Accordingly, for example, even when the projector on which the light source device is mounted is installed in various postures (a normal posture, a ceiling suspension posture, an upper projection posture, and a lower projection posture), the first to fourth Any one of the communication ports can be positioned above the center line when viewed from the direction along the center line of the arc tube.
For this reason, air is circulated by the flow path switching mechanism toward the communication port positioned on the upper side through one of the first and second main ducts and one of the first to fourth sub ducts. As a result, air can be blown to the upper part of the light emitting unit through the communication port and the rectifying unit.
Therefore, even when the projector is installed in various postures, air can be blown to the upper part of the light emitting unit, and the life of the arc tube can be extended.
Moreover, since the 1st, 2nd main duct distribute | circulates air along the side wall part of a cylinder, and a 1st-4th sub duct distribute | circulates air along the front wall part of a cylinder, Even when the first to fourth communication ports are formed at the four positions, the ducts can be collectively arranged at positions close to the cylindrical body.
Therefore, the light source device does not increase in size.

In the light source device of the present invention, the duct passes through the center line as viewed from the direction along the center line, and the first communication port, the second communication port, the third communication port, and the fourth communication port. It is preferable that they are formed so as to be symmetric with respect to an imaginary line that divides.
In the present invention, since the duct is formed so as to be symmetric with respect to the imaginary line, each flow path length inside the first and second main ducts can be set to be the same, and the first to fourth sub-lines can be set. Each flow path length inside the duct can be set to be the same.
Therefore, even when the projector on which the light source device is mounted is installed in various postures, the air volume and the air speed of the air blown to the upper part of the light emitting unit can be made substantially the same.

In the light source device according to the aspect of the invention, it is preferable that the duct is configured by a cover member that is attached to the outer surface of the cylindrical body and forms a flow path with the outer surface of the cylindrical body.
In the present invention, since the duct is composed of the cover member described above, each flow path for guiding air to the first to fourth communication ports can be formed only by attaching the cover member to the outer surface of the cylindrical body. The light source device can be reduced in size while simplifying the structure.

The projector of the present invention is a projector including a light source device, a light modulation device that modulates a light beam emitted from the light source device, and a projection optical device that projects the light beam modulated by the light modulation device. The light source device is the light source device described above.
In the present invention, since the projector includes the light source device described above, the projector can enjoy the same operations and effects as the light source device described above.

FIG. 2 is a plan view schematically showing the internal configuration of the projector in the embodiment. The perspective view which shows the structure of the light source device in this embodiment. The perspective view which shows the structure of the light source device in this embodiment. The figure which shows the structure of the lamp unit in this embodiment. The figure which shows typically the inside of the supporting member in this embodiment. The figure which shows the structure of the cylindrical member in this embodiment. The figure which shows the structure of the cylindrical member in this embodiment. FIG. 3 is a diagram schematically illustrating a posture of a projector according to the present embodiment. The figure for demonstrating the flow path in the normal position in this embodiment. The figure for demonstrating the flow path in the normal position in this embodiment. The figure for demonstrating the flow path in the ceiling hanging attitude | position in this embodiment. The figure for demonstrating the flow path in the upward projection attitude | position in this embodiment. The figure for demonstrating the flow path in the downward projection attitude | position in this embodiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
[Configuration of projector]
FIG. 1 is a plan view schematically showing the internal configuration of the projector 1 in the present embodiment.
Hereinafter, for convenience of explanation, a side (projection side) on which a projection lens 38 described later is disposed is referred to as “front side”, and the opposite side is referred to as “back side”.
In the following, in a state where the projector 1 is installed in the normal orientation (the posture in which the top surface is located on the upper side and the bottom surface is located on the lower side), the projection direction from the projection lens 38 is taken as the Z axis, and Z The horizontal axis perpendicular to the axis is taken as the X axis, and the vertical axis perpendicular to the Z axis is taken as the Y axis. In the Y axis, the upper side is the + Y axis side, and the lower side is the -Y axis side.
The projector 1 projects an image and displays a projected image on a screen (not shown).
As shown in FIG. 1, the projector 1 includes an optical unit 3 that is housed in the exterior housing 2.

[Configuration of optical unit]
As shown in FIG. 1, the optical unit 3 includes a light source device 4, an illumination optical device 31 having lens arrays 311 and 312, a polarization conversion element 313, and a superimposing lens 314, dichroic mirrors 321 and 322, and a reflection mirror. The color separation optical device 32 having the H.323, the incident side lens 331, the relay lens 333, the relay optical device 33 having the reflection mirrors 332 and 334, the three incident side polarizing plates 34, and the three liquid crystals as the light modulation device. A panel 35, three exit-side polarizing plates 36, a cross dichroic prism 37 as a color synthesizing optical device, a projection lens 38 as a projection optical device, and the optical components 31 to 37 are housed inside the projection lens 38. And an optical component casing 39 that supports the optical component.
In the optical unit 3, with the configuration described above, the light beam emitted from the light source device 4 and passing through the illumination optical device 31 is red (R), green (G), and blue (B) by the color separation optical device 32. Separated into three colored lights. Each separated color light is modulated by each liquid crystal panel 35. The modulated color lights are combined by a prism 37 to form an image and projected onto a screen by a projection lens 38.

[Configuration of light source device]
2 and 3 are perspective views showing the configuration of the light source device 4. FIG. Specifically, FIG. 2 is a perspective view of the light source device 4 as seen from the back side (−Z axis side) and from the + Y axis side, and FIG. 3 shows the light source device 4 at the front side (+ Z axis side) and −Y. It is the perspective view seen from the shaft side.
As shown in FIGS. 1 to 3, the light source device 4 includes a lamp unit 5 (FIG. 1) that emits light, and a collimating lens as a translucent member that substantially collimates the light beam emitted from the lamp unit 5. 6, a support member 7 (FIGS. 2 and 3) that supports the lamp unit 5 and the collimating lens 6, and a cooling fan F (FIG. 1) that blows air.

[Configuration of lamp unit]
FIG. 4 is a diagram showing a configuration of the lamp unit 5. Specifically, FIG. 4 is a cross-sectional view of the lamp unit 5 as viewed from the + Z-axis side (front side).
As shown in FIG. 1 or 4, the lamp unit 5 includes an arc tube 51 and a reflector 52 as a reflecting mirror.
As shown in FIG. 4, the arc tube 51 includes a light emitting part 511 that swells in a substantially spherical shape, and a pair of sealing parts 512, which sandwich the light emitting part 511 and extend from both ends of the light emitting part 511 in directions away from each other. 513.
In the following, for convenience of explanation, of the pair of sealing portions 512 and 513, the sealing portion 512 on the light emission front side (+ X axis side) is referred to as the front sealing portion 512, and the light emission rear side (−X The shaft-side sealing portion 513 is referred to as a rear sealing portion 513.

As shown in FIG. 4, a pair of electrodes E1 and E2 are arranged inside the light emitting unit 511, and a light emitting substance containing mercury, rare gas, and a small amount of halogen is enclosed between the pair of electrodes E1 and E2. A discharge space S is formed.
Molybdenum metal foils 5121 and 5131 electrically connected to the electrodes E1 and E2 are inserted into the sealing portions 512 and 513, respectively, and the opposite sides of the sealing portions 512 and 513 from the light emitting portion 511 are inserted. The end of is sealed with a glass material or the like.
Electrode lead lines 514 and 515 extending to the outside of the arc tube 51 are connected to the metal foils 5121 and 5131, respectively. When a voltage is applied to the electrode lead lines 514 and 515, the inside of the light emitting unit 511 Emits light.
Note that one end of a lead wire 516 is welded to the electrode lead wire 514 provided in the front side sealing portion 512 in order to apply a voltage to the electrode lead wire 514.

The reflector 52 has a reflecting surface (not shown) composed of a part of a spheroid having first and second focal points, reflects the light beam emitted from the first focal point, and converges to the second focal point. Let
In the arc tube 51, the rear sealing portion 513 is fixed to the reflector 52 so that the light emission center of the light emitting portion 511 is positioned at the first focal point of the reflector 52.
That is, as shown in FIG. 4, the arc tube 51 is disposed inside a reflector 52 that has a substantially concave cross section.

(Configuration of support member)
FIG. 5 is a diagram schematically showing the inside of the support member 7. Specifically, FIG. 5 is a view of the inside of the support member 7 as viewed from the + X-axis side (before light emission).
The support member 7 integrates the lamp unit 5 and the collimating lens 6 and has a function of guiding the air discharged from the cooling fan F to a predetermined position.
And this support member 7 is provided with the cylindrical member 8, the cover member 9 as a duct, and the flow-path switching mechanism 10 (FIG. 5) as shown in FIG.2, FIG3 or FIG.5.

[Configuration of cylindrical member]
6 and 7 are diagrams showing the configuration of the cylindrical member 8. Specifically, FIG. 6 is a view of the cylindrical member 8 viewed from the + X axis side (front side of light emission), and FIG. 7 is a view of the cylindrical member 8 viewed from the −X axis side (back side of light emission). is there.
The tubular member 8 surrounds the arc tube 51 and is formed so as to extend along the center line Ax (FIGS. 1, 4, and 5) of the arc tube 51.
More specifically, as shown in FIG. 2, FIG. 3, FIG. 6, or FIG. 7, the tubular member 8 includes a first tubular portion 81 positioned on the −X axis side (light emission rear side), and + X A second cylindrical portion 82, which is located on the axial side (front side of light emission) and has a smaller outer shape than the first cylindrical portion 81, is integrally formed with a stepped portion 8A.

The lamp unit 5 is fixed to the tubular member 8 in a state where the end portion on the + X-axis side (before light emission) of the reflector 52 having a substantially concave cross section is in contact with the stepped portion 8A.
Further, the collimating lens 6 is fixed to the + X axis side (before light emission) in the second cylindrical portion 82, as shown in FIG. 2, FIG. 3, or FIG.
As described above, the lamp unit 5 and the collimating lens 6 are fixed to the cylindrical member 8, so that the opening portion of the second cylindrical portion 82 on the −X axis side (the light emission rear side) is the lamp unit 5. The space Ar (FIG. 10) is closed, the opening portion on the + X axis side (front side of light emission) is closed by the collimating lens 6, and is surrounded by the second cylindrical portion 82, the lamp unit 5, and the collimating lens 6. Reference) is formed.

The 2nd cylindrical part 82 is provided with the side wall part 83 and the front wall part 84 (FIG. 6, FIG. 7), as shown in FIG. 5 thru | or FIG.
As shown in FIGS. 5 to 7, the side wall 83 includes an upper side wall 83U, a lower side wall 83D, a left side wall 83L, a right side wall 83R, and four intersecting walls 83C1 to 83C4. .
The upper and lower side wall portions 83U and 83D are respectively positioned on the top surface side and the bottom surface side of the projector 1 so as to face each other, and extend along the XZ plane.
The left and right wall portions 83L and 83R are positioned on the + Z axis side (front side) and the −Z axis side (back side) so as to face each other, and extend along the XY plane.
The four intersecting wall portions 83C1 to 83C4 connect the side wall portions 83U, 83D, 83L, and 83R.
Among these four intersecting wall portions 83C1 to 83C4, the air in the space Ar is discharged to the intersecting wall portion 83C1 connecting the left and lower side wall portions 83L and 83D as shown in FIG. 3 or FIG. An exhaust port 83C5 is formed.
As shown in FIG. 5, the side wall 83 has a hexagonal shape that surrounds the arc tube 51 when viewed from the + X axis side (front side of light emission).

As shown in FIG. 6 or FIG. 7, the front wall portion 84 is provided on the + X axis side (front side of light emission) in the second cylindrical portion 82, and extends along the YZ plane (substantially orthogonal to the center line Ax). And is connected to the side wall 83.
As shown in FIG. 6 or FIG. 7, a circular opening 85 for allowing the light beam to pass is formed in the front wall portion 84 at a substantially central portion.
The collimating lens 6 is fitted into the opening 85.

Further, as shown in FIG. 5 or FIG. 6, the front wall portion 84 is depressed on the −X axis side (light emission rear side), and the circumferential direction of the cylindrical member 8 (rotation direction around the center line Ax). Two upper left concave portions 86 and a lower right concave portion 87 are formed.
The upper left concave portion 86 has a substantially L shape extending from the + Y axis side to the + Z axis side (front side) with respect to the opening 85 when viewed from the + X axis side (front side of light emission).
Among the four intersecting wall portions 83C1 to 83C4, a part on the + X-axis side (front side of light emission) in the intersecting wall portion 83C2 connecting the upper and left side wall portions 83U and 83L is shown in FIGS. As shown, an upper left connection port 83C6 communicating with the upper left recess 86 is formed.

As shown in FIG. 5 or FIG. 6, the lower right recess 87 is substantially L-shaped and extends from the −Z-axis side (back side) to the + Y-axis side with respect to the opening 85 when viewed from the + X-axis side (front side of light emission). Have
Among the four intersecting wall portions 83C1 to 83C4, a part on the + X-axis side (front side of light emission) in the intersecting wall portion 83C3 connecting the right and lower side wall portions 83R and 83D is shown in FIGS. As shown, a lower right connection port 83C7 communicating with the inside of the lower right recess 87 is formed.

Further, as shown in FIG. 5 or 6, four rectangular communication ports 88 communicating with the space Ar are formed in the bottom portions of the concave portions 86 and 87.
In the following, the four communication ports 88 are associated with the upper, lower, left, and right side walls 83U, 83D, 83L, and 83R, and the upper, lower, left, and right communication ports 88U, 88D, 88L, and 88R To do.
As shown in FIG. 5, the upper and left communication ports 88U and 88L as the first and second communication ports are located on the + X axis side at the bottom portion of the upper left recess 86 as shown in FIG. As viewed from the (front side of light emission), it is formed at each position on the upper side and the left side of the center line Ax.
As shown in FIG. 5, the lower and right communication ports 88D and 88R as the third and fourth communication ports are arranged in the bottom portion of the lower right recess 87, as shown in FIG. As seen from the side (front side of light emission), the center line Ax is formed at each position below and on the right side.

Furthermore, on the inner surface of the front wall portion 84, as shown in FIG. 6 or FIG. 7, a cylindrical rectifying portion 89 that protrudes from the edge portion of each communication port 88 toward the −X-axis side (light emission rear side). Are formed respectively.
In the following, the four rectifying units 89 are associated with the upper, lower, left, and right communication ports 88U, 88D, 88L, and 88R, and the upper, lower, left, and right rectifying units 89U, 89D, 89L, and 89R are To do.
Each of these rectification units 89U, 89D, 89L, 89R has a function of rectifying the air introduced into the space Ar through the communication ports 88U, 88D, 88L, 88R toward the upper part of the light emitting unit 511.
In each of these rectifying units 89U, 89D, 89L, and 89R, the side wall on the side away from the center line Ax when viewed from the + X axis side (front side of light emission) is directed toward the −X axis side (back side of light emission). Inclined surfaces 89U1, 89D1, 89L1, and 89R1 that are inclined so as to be close to the center line Ax are formed (see FIGS. 6 and 10).

[Configuration of cover member]
The cover member 9 is attached to the outer surface of the cylindrical member 8, and the air discharged from the cooling fan F between the outer surface of the cylindrical member 8 is flow paths M1, M2 to the communication ports 88U, 88D, 88L, 88R, respectively. , S1 to S4 (see FIGS. 9 and 11 to 13).
As shown in FIG. 2, FIG. 3, or FIG. 5, the cover member 9 includes an introduction portion 91, first and second cover portions 92 and 93 as first and second main ducts, and third and third portions. 4 cover portions 94 and 95 (FIGS. 2 and 3).

As shown in FIG. 2, FIG. 3, or FIG. 5, the introduction portion 91 has the upper and right side walls among the four intersecting wall portions 83 </ b> C <b> 1 to 83 </ b> C <b> 4 with the cover member 9 attached to the outer surface of the tubular member 8. It is positioned at a position facing the intersecting wall portion 83C4 connecting the portions 83U and 83R.
And the introduction part 91 has the inlet 911 (FIG. 2, FIG. 5) to which the duct FD (FIG. 2, FIG. 3) is connected, and was discharged from the cooling fan F via the duct FD and the inlet 911. Air is introduced.

As shown in FIG. 2, FIG. 3, or FIG. 5, the first cover portion 92 is connected to the introduction portion 91 and extends along the upper side wall portion 83 </ b> U with the cover member 9 attached to the outer surface of the tubular member 8. (Tubular member 8 (along the circumferential direction of second cylindrical portion 82)) is formed to extend to intersecting wall portion 83C2 (FIG. 5).
The first cover portion 92 is in contact with the tubular member 8, and the first main flow path M1 (FIG. 9) guides the air introduced into the introduction portion 91 to the intersecting wall portion 83C2 along the side wall portion 83 (83U). , See FIG.
As shown in FIG. 2, FIG. 3, or FIG. 5, the second cover portion 93 is connected to the introduction portion 91 and extends along the right side wall portion 83 </ b> R with the cover member 9 attached to the outer surface of the tubular member 8. (Along the circumferential direction of the cylindrical member 8) and extending to the intersecting wall 83C3 (FIG. 5).
The second cover portion 93 is connected to the cylindrical member 8 and guides the air introduced into the introduction portion 91 to the intersecting wall portion 83C3 along the side wall portion 83 (83R) (see FIG. 11). , See FIG. 13).

As shown in FIG. 2 or 3, the third cover portion 94 as the first and second sub-ducts is connected to the first cover portion 92, and the cover member 9 is attached to the outer surface of the tubular member 8. , + X axis side (front side of light emission) is formed so as to cover the upper left connection port 83C6 and the opening portions of the upper left concave portion 86.
The third cover portion 94 introduces air that has circulated between the cylindrical member 8 and the first main flow path M1 into the upper left concave portion 86, and communicates with the upper and left communication along the front wall portion 84. First and second sub-channels S1 and S2 (see FIGS. 9 and 12) that lead to the ports 88U and 88L, respectively, are formed.

As shown in FIG. 2 or FIG. 3, the fourth cover portion 95 as the third and fourth sub ducts is connected to the second cover portion 93 and the cover member 9 is attached to the outer surface of the tubular member 8. , + X-axis side (front side of light emission) is formed so as to cover the opening portions of the lower right connection port 83C7 and the lower right recess 87.
The fourth cover portion 95 introduces air that has circulated between the cylindrical member 8 and the second main flow path M2 into the lower right concave portion 87, and moves downward and right along the front wall portion 84. Third and fourth sub-channels S3 and S4 (see FIGS. 11 and 13) that lead to the communication ports 88D and 88R, respectively, are formed.

  As shown in FIG. 5, the cover member 9 described above passes through the center line Ax as seen from the direction along the center line Ax, and the upper and left communication ports 88U and 88L, and the lower and right communication ports 88D and 88R, Are symmetric with respect to a virtual line V (virtual lines intersecting at 45 ° to the vertical direction (Y axis) and the horizontal direction (Z axis)).

[Configuration of flow path switching mechanism]
The flow path switching mechanism 10 is a mechanism for switching the flow paths M1, M2, S1 to S4 according to the attitude of the projector 1, and as shown in FIG. 5 or FIG. Three flow path switching mechanisms 11 to 13 are provided.
The first flow path switching mechanism 11 is a mechanism for switching the flow destination of the air introduced into the introduction portion 91 to the first main flow path M1 or the second main flow path M2, and as shown in FIG. 5 or FIG. It is provided at a position facing the wall portion 83C4 (inside the introduction portion 91).
The first flow path switching mechanism 11 rotates between the stepped portion 8A and the side wall on the + X axis side (before light emission) of the introduction portion 91 in a state where the cover member 9 is attached to the outer surface of the cylindrical member 8. It is pivotally supported.

The second flow path switching mechanism 12 is a mechanism for switching the flow destination of the air that has flowed along the first main flow path M1 to the first sub flow path S1 or the second sub flow path S2, and is shown in FIG. 5 or FIG. Thus, it is provided at a position facing the upper left connection port 83C6 inside the upper left recess 86.
The second flow path switching mechanism 12 is pivotally supported between the bottom portion of the upper left concave portion 86 and the third cover portion 94 in a state where the cover member 9 is attached to the outer surface of the cylindrical member 8. The

The third flow path switching mechanism 13 is a mechanism that switches the flow destination of the air that has flowed along the second main flow path M2 to the third sub flow path S3 or the fourth sub flow path S4, and is shown in FIG. 5 or FIG. Thus, it is provided at a position facing the lower right connection port 83C7 inside the lower right recess 87.
The third flow path switching mechanism 13 is pivotally supported between the bottom portion of the lower right concave portion 87 and the fourth cover portion 95 in a state where the cover member 9 is attached to the outer surface of the cylindrical member 8. Is done.

[Flow path of air discharged from cooling fan]
Next, the flow path of the air discharged from the cooling fan F will be described.
In the present embodiment, the flow path switching mechanism 10 described above is provided, so that the flow path of the air discharged from the cooling fan F differs depending on the attitude of the projector 1.
For this reason, below, after demonstrating the attitude | position of the projector 1, the flow path in each attitude | position of the projector 1 is demonstrated in order.

[Projector attitude]
FIG. 8 is a diagram schematically illustrating the posture of the projector 1.
In the present embodiment, the projector 1 is configured to be installable in various postures as shown in FIG.
For example, the projector 1 is installed in a normal posture as shown in FIG.
Here, the normal orientation means an orientation in which the projection direction (+ Z axis) from the projection lens 38 is substantially horizontal as shown in FIG.
Further, as shown in FIG. 8B, the projector 1 means a posture rotated by 180 ° around the X axis (center line Ax) from the normal posture (FIG. 8A).

Further, as shown in FIG. 8C, the projector 1 is installed in an upward projection posture.
Here, as shown in FIG. 8 (C), the upward projection posture is the direction of the arrow A1 (FIG. 8 (A) with the X axis (center line Ax) as the center from the normal posture (FIG. 8 (A)). )), And means that the projection direction (+ Z axis) from the projection lens 38 is on the upper side.
Further, as shown in FIG. 8D, the projector 1 moves from the normal position (FIG. 8A) in the direction of arrow A2 (FIG. 8A) about the X axis (center line Ax). This means a posture in which the projection direction (+ Z axis) from the projection lens 38 is on the lower side.

[Air flow path in normal position]
9 and 10 are diagrams for explaining the flow path in the normal posture. Specifically, FIG. 9 is a schematic view of the inside of the support member 7 in the normal posture as viewed from the + X-axis side (front side of light emission). FIG. 10 is a cross-sectional view of the light source device 4 in the normal orientation taken along the XY plane passing through the center line Ax.
In FIG. 9, for convenience of explanation, the vertical direction in the drawing is illustrated along the vertical axis to which the light source device 4 is applied with its own weight. The same applies to FIGS. 11 to 13.

In the case of the normal position, as shown in FIG. 9 or FIG. 10, the upper communication port 88U is located above the center line Ax among the communication ports 88U, 88D, 88L, 88R.
In the case of the normal position, as shown in FIG. 9, the first flow path switching mechanism 11 is positioned obliquely on the upper right side of the center line Ax when viewed from the + X axis side (front side of light emission) Until the rotation is restricted by the first restricting portion 9A of the member 9, it is rotated clockwise by its own weight, and the space between the introduction port 911 and the second main flow path M2 is blocked.
For this reason, the air introduced into the introduction part 91 from the cooling fan F through the duct FD and the introduction port 911 flows along the first main flow path M1 as shown in FIG.

In the case of the normal position, as shown in FIG. 9, the second flow path switching mechanism 12 is positioned obliquely on the upper left side with respect to the center line Ax when viewed from the + X axis side (the light emission front side). Rotate counterclockwise by its own weight until it comes into contact with the edge portion of the upper left connection port 83C6, thereby blocking between the upper left connection port 83C6 and the second sub flow path S2.
For this reason, as shown in FIG. 9, the air that has circulated along the first main flow path M1 is introduced into the upper left recessed portion 86 through the upper left connection port 83C6, and circulates along the first sub flow path S1.
Then, the air flowing along the first sub-flow path S1 is introduced into the space Ar while being rectified by the upper rectification unit 89U via the upper communication port 88U located above the center line Ax.
Specifically, as shown in FIG. 10, the air that has circulated along the first sub-channel S1 is rectified downward by the inclined surface 89U1 toward the −X axis side (light emission rear side). The Then, the air rectified by the upper rectifying unit 89U is blown toward the apex position above the light emitting unit 511 to cool the upper part of the light emitting unit 511.

Further, a part of the air introduced from the cooling fan F into the introduction portion 91 through the duct FD and the introduction port 911 circulates as shown below.
As shown in FIG. 7, an auxiliary air outlet 83C8 communicating with the space Ar is formed in the intersecting wall 83C4.
A part of the air introduced into the introduction portion 91 is not specifically shown, but is introduced into the space Ar via the auxiliary air blowing port 83C8, and the front end of the front side sealing portion 512 (the electrode lead wire 514). And the leading end of the front side sealing portion 512 is cooled.

As described above, the air after cooling the tips of the light emitting unit 511 and the front side sealing unit 512 is discharged to the outside of the light source device 4 through the exhaust port 83C5 as shown in FIG. The light is discharged out of the light source device 4 through a gap between the side sealing portion 513 and the reflector 52.
In addition, about the ventilation to the said welding position via the auxiliary ventilation port 83C8, and exhaust_gas | exhaustion via the exhaust port 83C5 grade | etc., It is performed similarly also in the ceiling suspension attitude | position described below, an upper projection attitude | position, and a lower projection attitude | position Therefore, the description is omitted below.

[Air flow path in a suspended position]
FIG. 11 is a view for explaining the flow path in the ceiling suspension posture. Specifically, FIG. 11 is a schematic view of the inside of the support member 7 in the ceiling hanging posture as viewed from the + X-axis side (front side of light emission).
In the case of the ceiling hanging posture, as shown in FIG. 11, the lower communication port 88D is located above the center line Ax among the communication ports 88U, 88D, 88L, 88R.
In the case of the ceiling suspension posture, as shown in FIG. 11, the first flow path switching mechanism 11 is positioned obliquely lower left with respect to the center line Ax when viewed from the + X axis side (front side of light emission). Until the rotation is restricted by the second restricting portion 9B of the cover member 9, the cover member 9 is rotated counterclockwise by its own weight, and the inlet 911 and the first main flow path M1 are blocked.
For this reason, the air introduced into the introduction part 91 from the cooling fan F through the duct FD and the introduction port 911 flows along the second main flow path M2, as shown in FIG.

In the case of the ceiling suspension posture, as shown in FIG. 11, the third flow path switching mechanism 13 is on the + X axis side (front side of light emission), similarly to the second flow path switching mechanism 12 in the normal position. When viewed from the center line Ax, it is positioned obliquely on the upper left side and rotates counterclockwise by its own weight until it abuts on the edge of the lower right connection port 83C7, and the lower right connection port 83C7 and the fourth substream Intersection with the road S4 is interrupted.
For this reason, as shown in FIG. 11, the air flowing along the second main flow path M2 is introduced into the lower right concave portion 87 via the lower right connection port 83C7, and flows along the third sub flow path S3. To do.
Then, the air flowing along the third sub-flow path S3 is introduced into the space Ar while being rectified by the lower rectification unit 89D via the lower communication port 88D located on the upper side of the center line Ax. In the same manner as above, the air is blown toward the top position of the light emitting unit 511.

[Air flow path in upward projection position]
FIG. 12 is a diagram for explaining the flow path in the upward projection posture. Specifically, FIG. 12 is a schematic view of the inside of the support member 7 in the upward projection posture as viewed from the + X-axis side (front side of light emission).
In the upward projection posture, as shown in FIG. 12, among the communication ports 88U, 88D, 88L, 88R, the left communication port 88L is located above the center line Ax.
In the case of the upward projection posture, the first flow path switching mechanism 11 is positioned obliquely lower right with respect to the center line Ax as seen from the + X axis side (front side of light emission) as shown in FIG. And shows the same behavior as in the normal position. That is, the air from the cooling fan F flows along the first main flow path M1.

In the case of the upward projection posture, as shown in FIG. 12, the second flow path switching mechanism 12 is positioned obliquely on the upper right side with respect to the center line Ax when viewed from the + X-axis side (before light emission). Contrary to the case of the normal placement posture, it rotates clockwise by its own weight until it comes into contact with the edge portion of the upper left connection port 83C6, and the upper left connection port 83C6 and the first sub flow path S1 are blocked.
For this reason, as shown in FIG. 12, the air that has flowed along the first main flow path M1 is introduced into the upper left recessed portion 86 through the upper left connection port 83C6, and flows along the second sub flow path S2.
Then, the air flowing along the second sub-flow path S2 is introduced into the space Ar while being rectified by the left rectification unit 89L via the left communication port 88L located above the center line Ax, and in the normal position In the same manner as above, the air is blown toward the top position of the light emitting unit 511.

[Air flow path in downward projection position]
FIG. 13 is a diagram for explaining the flow path in the downward projection posture. Specifically, FIG. 13 is a schematic view of the inside of the support member 7 in the downward projection posture as viewed from the + X-axis side (front side of light emission).
In the case of the downward projection posture, as shown in FIG. 13, the right communication port 88R is positioned above the center line Ax among the communication ports 88U, 88D, 88L, 88R.
In the case of the downward projection posture, as shown in FIG. 13, the first flow path switching mechanism 11 is positioned obliquely on the upper left side with respect to the center line Ax when viewed from the + X axis side (the light emission front side). It shows the same behavior as when suspended from the ceiling. That is, the air from the cooling fan F flows along the second main flow path M2.

Further, in the case of the lower projection posture, the third flow path switching mechanism 13 is, as shown in FIG. 13, the + X axis side (front side of light emission), similarly to the second flow path switching mechanism 12 in the upper projection posture. When viewed from the center line Ax, it is positioned obliquely on the upper right side, and rotates clockwise by its own weight until it abuts on the edge of the lower right connection port 83C7, and the lower right connection port 83C7 and the third sub-flow path Shut off from S3.
For this reason, as shown in FIG. 13, the air flowing along the second main flow path M2 is introduced into the lower right concave portion 87 via the lower right connection port 83C7, and flows along the fourth sub flow path S4. To do.
Then, the air flowing along the fourth sub-flow path S4 is introduced into the space Ar while being rectified by the right rectification unit 89R via the right communication port 88R located above the center line Ax, and in the normal position. In the same manner as above, the air is blown toward the top position of the light emitting unit 511.

According to this embodiment described above, the following effects are obtained.
In the present embodiment, in the second tubular portion 82, a communication port 88 and a rectifying portion 89 are provided in the front wall portion 84 that is separated from the reflector 52 and to which the collimating lens 6 is attached.
That is, in the second cylindrical portion 82, the side away from the reflector 52 has a larger non-interference space IAr (the space indicated by the alternate long and short dash line in FIG. 10) than the side adjacent to the reflector 52. Compared with the configuration in which the communication port and the rectifying unit are provided in 83, the rectifying unit 89 having a larger size can be provided in the second cylindrical portion 82.
Accordingly, the rectifying unit 89 can have a good rectifying effect, and air can be blown well above the light emitting unit 511 to extend the life of the arc tube 51.

In addition, four communication ports 89U, 89D, 89L, and 89R are formed in the front wall portion 84 at respective positions on the top, bottom, left, and right of the center line Ax when viewed from the + X axis side (front side of light emission).
As a result, even when the projector 1 is installed in various postures (a normal posture, a ceiling suspension posture, an upper projection posture, and a lower projection posture), any of the communication ports 88U, 88D, 88L, and 88R. The communication port 88 can be positioned above the center line Ax when viewed from the direction along the center line Ax.
For this reason, the flow path switching mechanism 10 causes the upper side to pass through any one of the first and second main flow paths M1 and M2 and any one of the first to fourth sub-flow paths S1 to S4. By allowing air to flow toward the communication port 88 positioned at, air can be blown to the upper portion of the light emitting unit 511 via the communication port 88 and the rectifying unit 89.
Therefore, even when the projector 1 is installed in various postures, air can be blown to the upper portion of the light emitting unit 511, and the life of the arc tube 51 can be extended.

In addition, since the first and second cover portions 92 and 93 circulate air along the side wall portion 83 and the third and fourth cover portions 94 and 95 circulate air along the front wall portion 84, the front wall Even when the communication ports 88U, 88D, 88L, and 88R are formed at the four positions of the portion 84, the cover member 9 can be disposed at a position close to the second cylindrical portion 82.
Therefore, the light source device 4 does not increase in size.

Further, since the cover member 9 is formed so as to be symmetric with respect to the virtual line V, the flow path lengths of the first and second main flow paths M1 and M2 can be set to be the same, and the first to first The lengths of the four sub-channels S1 to S4 can be set to be the same.
Therefore, even when the projector 1 is installed in various postures, the air volume and the wind speed of the air blown to the upper part of the light emitting unit 511 can be made substantially the same.

In addition, since the duct according to the present invention is constituted by the cover member 9, each flow path M1, M2, S1 through which air is circulated to each communication port 88 simply by attaching the cover member 9 to the outer surface of the tubular member 8 is provided. S4 can be formed, and the light source device 4 can be downsized while the structure of the light source device 4 is simplified.
Further, the front wall portion 84 has recesses 86 and 87 having communication ports 88 formed in the bottom portion, and the third and fourth cover portions 94 and 95 close the respective opening portions of the recesses 86 and 87. Thus, since the first to fourth sub-channels S1 to S4 can be formed, the light source device 4 can be further downsized.

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 embodiment, the four communication ports 88 are formed in the second cylindrical portion 82, but the number is not particularly limited as long as it is formed in the front wall portion 84. You may employ | adopt the structure formed two, three, or five or more. The same applies to the rectifying unit 89.
In the embodiment, the collimating lens 6 is fitted to the opening 85 of the front wall portion 84. However, the present invention is not limited to this, and the translucent member having translucency is used instead of the collimating lens 6. You may employ | adopt the structure fitted to the opening part 85. FIG.
In the above-described embodiment, for the sake of simplicity, the projector 1 has been described with reference to the four postures of the normal posture, the ceiling suspension posture, the upper projection posture, and the lower projection posture as examples. Can be set to various postures capable of projecting in all directions of 360 ° centering on the center line Ax.

In the embodiment, the projector 1 includes the three liquid crystal panels 35, but the present invention is not limited to this. That is, the present invention can also be applied to a projector using two or less or four or more liquid crystal panels.
In the embodiment, as the light modulation device, a reflection type liquid crystal panel may be adopted in addition to the transmission type liquid crystal panel. In addition, as long as the light modulation device modulates a light beam according to image information, a light modulation device having another configuration may be employed. For example, the present invention can be applied to a projector using a light modulation device other than liquid crystal, such as a device using a micromirror. When such a light modulation device is used, the polarizing plates 34 and 36 on the light incident side and the light emitting side can be omitted.
In the above embodiment, only an example of a front projection type projector has been described. However, the present invention can also be applied to a rear type projector that includes a screen and performs projection from the back side of the screen.

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

  DESCRIPTION OF SYMBOLS 1 ... Projector, 4 ... Light source device, 6 ... Parallelizing lens (translucent member), 9 ... Cover member (duct), 10 ... Flow path switching mechanism, 35 ... Liquid crystal panel (light modulation device), 38 ... projection lens (projection optical device), 51 ... light emitting tube, 52 ... reflector (reflecting mirror), 82 ... second cylindrical part (cylinder) , 83... Side wall portion, 84... Front wall portion, 85... Opening portion, 88... Communication port, 88 U. Upper communication port (first communication port), 88 D. Port (third communication port), 88L ... Left communication port (second communication port), 88R ... Right communication port (fourth communication port), 89 ... Rectifying unit, 92 ... First cover Part (first main duct), 93 ... second cover part (second main duct), 94 ... third cover part (first and second sub ducts), 95 ... fourth cover Part (third and fourth sub-duct), 511 ... light-emitting unit, Ax ... center line, E1, E2 ... electrode, V ... phantom.

Claims (5)

A light source device comprising: a light emitting tube having a light emitting portion in which a pair of electrodes are disposed; and a reflecting mirror that reflects a light beam emitted from the light emitting portion and converges it to a predetermined position;
A cylindrical body provided on the light emission front side of the reflecting mirror;
A translucent member that transmits the light beam reflected by the reflecting mirror,
The cylinder is
A side wall surrounding the arc tube;
A front wall portion provided on the light emission front side of the cylindrical body and connected to the side wall portion;
In the front wall portion,
An opening into which the translucent member is fitted; and
A communication port communicating between the inside and outside of the cylinder;
A light source device, comprising: a rectifying unit that rectifies air introduced into the cylindrical body through the communication port toward the light emitting unit. The light source device according to claim 1,
The communication port is
When viewed from the direction along the center line of the arc tube, the first to fourth communication ports provided respectively at the top, bottom, left and right positions of the center line,
The light source device is
Ducts for guiding air to the first to fourth communication ports,
A flow path switching mechanism for switching the flow path inside the duct,
The duct is
A first main duct and a second main duct that extend in the circumferential direction of the cylindrical body and distribute air in directions away from each other along the side wall portion;
A first sub duct that circulates air that has circulated through the first main duct along the front wall portion and that leads to the first communication port and the second communication port that are adjacent to each other in the circumferential direction of the cylindrical body; A second auxiliary duct;
A third sub-duct and a fourth sub-duct that circulates the air circulated through the second main duct along the front wall and guides the air to the third communication port and the fourth communication port, respectively. A light source device. The light source device according to claim 2,
The duct is
As viewed from the direction along the center line, it passes through the center line and is symmetrical with respect to an imaginary line that divides the first communication port, the second communication port, the third communication port, and the fourth communication port. It is formed so that it may become. The light source device characterized by the above-mentioned. In the light source device according to claim 2 or 3,
The duct is
A light source device comprising: a cover member attached to the outer surface of the cylinder and forming a flow path with the outer surface of the cylinder. A projector comprising: a light source device; a light modulation device that modulates a light beam emitted from the light source device; and a projection optical device that projects the light beam modulated by the light modulation device,
The light source device
The projector according to claim 1, wherein the projector is a light source device according to claim 1.

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