Light source device and projector

Abstract

A light source lamp unit ( 10 ) includes a light source lamp ( 11 ), an ellipsoidal reflector ( 12 ) and a plate body ( 19 ). The plate body ( 19 ) is provided behind the reflector ( 12 ) with a gap kept therebetween, which has a shape corresponding to the profile of a reflecting portion ( 122 ) of the reflector ( 12 ). A cooling channel for passing a cooling air is formed between the plate body ( 19 ) and the reflector ( 12 ). The width of the cooling channel in a direction along an optical axis of the light source lamp ( 11 ) is minimized at a part near a neck portion ( 121 ) of the reflecting portion ( 122 ) and enlarged toward the peripheral edge of the reflecting portion ( 122 ) of the reflector ( 12 ).

1. A light source device, comprising:
 a light-emitting tube including a light-emitting portion that generates light by an electric discharge between electrodes and sealing portions provided on both sides of the light-emitting portion; and 
 a reflector provided behind the light-emitting portion of the light-emitting tube and having a reflecting portion that irradiates the light beam irradiated by the light-emitting tube after aligning in a predetermined direction, 
 wherein the reflecting portion of the reflector reflects visible lights and transmits infrared rays and ultraviolet rays in the light beam irradiated by the light-emitting portion of the light-emitting tube, a reflecting portion of the reflector reflects visible lights and transmits infrared rays in the light irradiated by the light-emitting portion of the light-emitting tube attached on the reflecting portion, 
 wherein a plate body is provided behind the reflector spaced apart from the reflecting portion of the reflector with a predetermined gap, the plate body having a shape corresponding to the a profile of the reflection reflecting portion of the reflector and absorbing the infrared rays and the ultraviolet rays transmitted through the reflecting portion, and 
 wherein a cooling channel that passes a cooling fluid is formed between the reflecting portion of the reflector and the plate body, and 
 wherein the surface emissivity of the surface of the plate body is 0.8 or above on a side near the reflector. 
 
     
     
       2. The light source device according to  claim 1 , further comprising:
 a neck portion provided on the reflecting portion of the reflector to support the sealing portions of the light-emitting portion, 
 wherein the width of the cooling channel formed between the reflecting portion of the reflector and the plate body along an optical axis direction of the light-emitting portion is minimized at a part near the neck portion of the reflecting portion and enlarged toward a peripheral edge of the reflector. 
 
     
     
       3. The light source device according to  claim 2 , wherein the minimum width of the cooling channel is from 5 to 15 mm. 
     
     
       4. The light source device according to  claim 1 , wherein the surface of the plate body has irregularities on a side near the reflector. 
     
     
       5. The light source device according to  claim 1 , further comprising:
 a neck portion provided on the reflecting portion of the reflector to support the sealing portions of the light-emitting portion,   wherein the plate body is made of a heat-conductive material and fixed on the neck portion of the reflector.   
     
     
       6. The light source device according to  claim 1 ,
 wherein in the sealing portions of the light-emitting tube, the one sealing portion provided on the side near the reflector is fixed on the reflector via a cylindrical heat-conductive member with one end extending behind the reflector, and 
 wherein the plate body is made of a heat-conductive material and is abutted on an end of the heat-conductive member. 
 
     
     
       7. A projector that forms an optical image by modulating a light beam irradiated by a light source in accordance with image information and projects the optical image in an enlarged manner, the projector comprising:
 the light source device according to  claim 1 . 
 
     
     
       8. The projector according to  claim 7 , further comprising:
 a neck portion provided on the reflecting portion of the reflector to support the sealing portions of the light-emitting portion, 
 wherein the width of the cooling channel formed between the reflecting portion of the reflector and the plate body along an optical axis direction of the light-emitting portion is minimized at a part near the neck portion of the reflecting portion and enlarged toward a peripheral edge of the reflector. 
 
     
     
       9. The projector according to  claim 8 , wherein the minimum width of the cooling channel is from 5 to 15 mm. 
     
     
       10. The projector according to  claim 7 , wherein the surface of the plate body has irregularities on a side near the reflector. 
     
     
       11. The projector according to  claim 7 , further comprising:
 a neck portion provided on the reflecting portion of the reflector to support the sealing portions of the light-emitting portion, 
 wherein the plate body is made of a heat-conductive material and fixed on the neck portion of the reflector. 
 
     
     
       12. The projector according to  claim 7 ,
 wherein in the sealing portions of the light-emitting tube, the one sealing portion provided on the side near the reflector is fixed on the reflector via a cylindrical heat-conductive member with one end extending behind the reflector, and 
 wherein the plate body is made of a heat-conductive material and is abutted on an end of the heat-conductive member. 
 
     
     
       13. A light source device, comprising:
 a light-emitting tube including a light-emitting portion that generates light by an electric discharge between electrodes and sealing portions provided on both sides of the light-emitting portion; and 
 a reflector provided behind the light-emitting portion of the light-emitting tube and having a reflecting portion that irradiates the light beam irradiated by the light-emitting tube after aligning in a predetermined direction, 
 wherein the reflecting portion of the reflector reflects visible lights and transmits infrared rays and ultraviolet rays in the light beam irradiated by the light-emitting portion of the light-emitting tube a reflecting portion of the reflector reflects visible lights and transmits infrared rays in the light irradiated by the light-emitting portion of the light-emitting tube attached on the reflecting portion, 
 wherein a plate body having a shape corresponding to the profile of the reflecting portion of the reflector is provided behind the reflector with the outer circumference thereof being spaced apart from the reflecting portion of the reflector with a predetermined gap, the plate body being independent having a shape corresponding to a profile of the reflecting portion of the reflector and absorbing the infrared rays and the ultraviolet rays transmitted through the reflecting portion, 
 wherein a cooling channel that passes a cooling fluid is formed between the reflecting portion of the reflector and the plate body, 
 wherein in the sealing portions of the light-emitting tube, the one sealing portion provided on the side near the reflector is fixed on the reflector via a cylindrical heat-conductive member with one end extending behind the reflector, and 
 wherein the plate body is made of a heat-conductive material and is abutted on an end of the heat-conductive member. 
 
     
     
       14. The light source device according to  claim 13 , further comprising:
 a neck portion provided on the reflecting portion of the reflector to support the sealing portions of the light-emitting portion, 
 wherein the width of the cooling channel formed between the reflecting portion of the reflector and the plate body along an optical axis direction of the light-emitting portion is minimized at a part near the neck portion of the reflecting portion and enlarged toward a peripheral edge of the reflector. 
 
     
     
       15. The light source device according to  claim 14 , wherein the minimum width of the cooling channel is from 5 to 15 mm. 
     
     
       16. The light source device according to  claim 13 , wherein the surface of the plate body has irregularities on a side near the reflector. 
     
     
       17. A projector that forms an optical image by modulating a light beam irradiated by a light source in accordance with image information and projects the optical image in an enlarged manner, the projector comprising:
 the light source device according to  claim 13 . 
 
     
     
       18. The projector according to  claim 17 , further comprising:
 a neck portion provided on the reflecting portion of the reflector to support the sealing portions of the light-emitting portion, 
 wherein the width of the cooling channel formed between the reflecting portion of the reflector and the plate body along an optical axis direction of the light-emitting portion is minimized at a part near the neck portion of the reflecting portion and enlarged toward a peripheral edge of the reflector. 
 
     
     
       19. The projector according to  claim 18 , wherein the minimum width of the cooling channel is from 5 to 15 mm. 
     
     
       20. The projector according to  claim 17 , wherein the surface of the plate body has irregularities on a side near the reflector. 
     
     
       21. A light source device comprising:
 a light-emitting tube including a light-emitting portion that generates light by an electric discharge between electrodes;   a reflector provided behind the light-emitting portion of the light-emitting tube and having a reflecting portion that irradiates the light irradiated by the light-emitting tube; and   a lamp housing that houses the light-emitting tube and the reflector,   wherein a reflecting portion of the reflector reflects visible lights and transmits infrared rays in the light irradiated by the light-emitting portion of the light-emitting tube is attached on the reflecting portion,   wherein a plate body is provided behind the reflector spaced apart from the reflecting portion of the reflector with a predetermined gap, the plate body having a shape corresponding to a profile of the reflecting portion of the reflector and absorbing the infrared rays transmitted through the reflecting portion,   wherein the lamp housing has a fixing section that positions the reflector in an optical axis direction,   wherein the plate body is fixed to the fixing section,   wherein a cooling channel that passes a cooling fluid is formed between the reflecting portion of the reflector and the plate body, and   wherein the surface emissivity of the surface of the plate body is 0.8 or above on a side near the reflector.   
     
     
       22. The light source device according to claim 21, wherein
 the fixing section has a fixing portion which fixes the plate body, and the plate body is fixed to the fixing portion.   
     
     
       23. A projector that forms an optical image by modulating a light irradiated by a light source in accordance with image information and projects the optical image in an enlarged manner, the projector comprising:
 the light source device according to claim 21.   
     
     
       24. The projector according to claim 23, further comprising:
 a neck portion provided on the reflecting portion of the reflector to support sealing portions provided on both sides of the light-emitting portion,   wherein a width of the cooling channel formed between the reflecting portion of the reflector and the plate body along the optical axis direction of the light-emitting portion is smaller at a part near the neck portion of the reflecting portion than at a part near a peripheral edge of the reflector.   
     
     
       25. The projector according to claim 23,
 wherein a width of the cooling channel formed between the reflecting portion of the reflector and the plate body along the optical axis direction of the light-emitting portion is a minimum at a part near a neck portion of the reflecting portion that supports the light-emitting tube, and a maximum at a peripheral edge of the reflector.   
     
     
       26. The projector according to claim 23,
 wherein a width of the cooling channel formed between the reflecting portion of the reflector and the plate body along the optical axis direction of the light-emitting portion is minimized at a part near a neck portion of the reflecting portion that supports the light-emitting tube and enlarged toward a peripheral edge of the reflector.   
     
     
       27. The projector according to claim 23, further comprising:
 an exhaust fan that blows a cooling air along a direction orthogonal to the optical axis direction to let the cooling air pass through the cooling channel, and an exhaust port from which the cooling air from the exhaust fan is discharged.   
     
     
       28. The projector according to claim 27,
 wherein the exhaust fan draws in the cooling air inside the projector.   
     
     
       29. The projector according to claim 23, further comprising:
 a fan that blows a cooling air along a direction orthogonal to the optical axis direction to let the cooling air pass through the cooling channel.   
     
     
       30. The projector according to claim 29,
 wherein the fan draws in the cooling air inside the projector.   
     
     
       31. The projector according to claim 23, wherein
 the lamp housing is configured in an L-shape formed by the fixing section and a horizontal portion that is fixed to the base of the projector, and   the plate body is fixed to an upper side of the fixing section that is opposite to an end of the fixing section connected to the horizontal portion.   
     
     
       32. The projector according to claim 31, wherein
 a projection is formed on the upper side of the fixing section opposite the end of the fixing section connected to the horizontal portion, and the plate body is fixed to the projection.   
     
     
       33. The projector according to claim 23,
 wherein the reflecting portion of the reflector transmits ultraviolet rays in the light irradiated by the light emitting portion of the light-emitting tube, and   wherein the plate body inhibits the ultraviolet rays from being transmitted through the reflecting portion.   
     
     
       34. The projector according to claim 23, wherein
 a cover portion is provided on a front side of the reflector.   
     
     
       35. The projector according to claim 34, wherein
 the cover portion is formed in an approximately conical cylinder.   
     
     
       36. The projector according to claim 34, wherein
 the cover portion is attached to an opening of the fixing section of the lamp housing.   
     
     
       37. The projector according to claim 34, wherein
 the cover portion is made of a heat absorbing material.   
     
     
       38. The projector according to claim 34, wherein
 ultraviolet rays that are radiated forward of the light-emitting portion are inhibited by the cover portion.   
     
     
       39. The projector according to claim 34,
 wherein a fan blows the cooling air to the cover portion.   
     
     
       40. The light source device according to claim 21,
 wherein a minimum width of the cooling channel is from 5 to 15 mm.   
     
     
       41. The projector according to claim 23,
 further comprising a neck portion configured on the reflector such that the neck portion supports the light-emitting tube,   wherein a width of the cooling channel between a part near the neck portion and the plate body along the optical axis direction of the light-emitting portion is from 5 to 15 mm.   
     
     
       42. The projector according to claim 23,
 further comprising sealing portions provided on the light-emitting tube,   wherein one sealing portion provided on a side near the reflector is fixed to the reflector via a cylindrical heat-conductive member with one end of the sealing portion extending behind the reflector, and wherein the plate body is made of a heat-conductive material and is abutted on an end of the heat-conductive member.   
     
     
       43. The light source device according to claim 21, wherein
 the fixing section consists of a vertical portion.   
     
     
       44. A projector comprising:
 a light-emitting tube including a light-emitting portion that generates light by an electric discharge between electrodes and sealing portions provided on both sides of the light-emitting portion;   a reflector provided behind the light-emitting portion of the light-emitting tube and having a reflecting portion that irradiates the light irradiated by the light-emitting tube after aligning in a predetermined direction; and   a lamp housing that houses the light-emitting tube and the reflector,   wherein a reflecting portion of the reflector reflects visible lights and transmits infrared rays in the light irradiated by the light-emitting portion of the light-emitting tube, the light-emitting tube being attached on the reflecting portion,   wherein a plate body is provided behind the reflector spaced apart from the reflecting portion of the reflector with a predetermined gap, the plate body having a shape corresponding to a profile of the reflecting portion of the reflector and absorbing the infrared rays transmitted through the reflecting portion,   wherein the lamp housing has a fixing section that positions the reflector in an optical axis direction,   wherein the plate body is fixed to the fixing section,   wherein a fan blows a cooling air between the reflecting portion of the reflector and the plate body, and   wherein the surface emissivity of the surface of the plate body is 0.8 or above on a side near the reflector.   
     
     
       45. A projector comprising:
 a light-emitting tube including a light-emitting portion that generates light by an electric discharge between electrodes and sealing portions provided on both sides of the light-emitting portion;   a reflector provided behind the light-emitting portion of the light-emitting tube and having a reflecting portion that irradiates the light irradiated by the light-emitting tube after aligning in a predetermined direction; and   a lamp housing that houses the light-emitting tube and the reflector,   wherein a reflecting portion of the reflector reflects visible lights and transmits infrared rays in the light irradiated by the light-emitting portion of the light-emitting tube, the light-emitting tube being attached on the reflecting portion,   wherein a plate body is provided behind the reflector spaced apart from the reflecting portion of the reflector with a predetermined gap, the plate body having a shape corresponding to a profile of the reflecting portion of the reflector and absorbing the infrared rays transmitted through the reflecting portion,   wherein the lamp housing has a fixing section that positions the reflector in an optical axis direction,   wherein the plate body is fixed to the fixing section,   wherein a fan blows a cooling air between the reflecting portion of the reflector and the plate body, and   wherein the minimum width of the cooling channel is from 5 to 15 mm.   
     
     
       46. The projector according to claim 44, wherein
 the fixing section consists of a vertical portion.   
     
     
       47. A projector comprising:
 a light-emitting tube including a light-emitting portion that generates light by an electric discharge between electrodes and sealing portions provided on both sides of the light-emitting portion; and   a reflector provided behind the light-emitting portion of the light-emitting tube and having a reflecting portion that irradiates the light irradiated by the light-emitting tube after aligning in a predetermined direction,   wherein a reflecting portion of the reflector reflects visible lights and transmits infrared rays in the light irradiated by the light-emitting portion of the light-emitting tube attached on the reflecting portion,   wherein a plate body is provided behind the reflector spaced apart from the reflecting portion of the reflector with a predetermined gap, the plate body having a shape corresponding to a profile of the reflecting portion of the reflector and absorbing the infrared rays transmitted through the reflecting portion,   wherein a cooling channel that passes a cooling fluid is formed between the reflecting portion of the reflector and the plate body, and   wherein the minimum width of the cooling channel is from 5 to 15 mm.   
     
     
       48. A projector comprising:
 a light-emitting tube including a light-emitting portion that generates light by an electric discharge between electrodes;   a reflector provided behind the light-emitting portion of the light-emitting tube and having a reflecting portion that irradiates the light irradiated by the light-emitting tube; and   a lamp housing that houses the light-emitting tube and the reflector,   wherein a reflecting portion of the reflector reflects visible lights and transmits infrared rays in the light irradiated by the light-emitting portion of the light-emitting tube attached on the reflecting portion,   wherein a plate body is provided behind the reflector spaced apart from the reflecting portion of the reflector with a predetermined gap, the plate body having a shape corresponding to a profile of the reflecting portion of the reflector and absorbing the infrared rays transmitted through the reflecting portion,   wherein the lamp housing has a fixing section that positions the reflector in an optical axis direction,   wherein the plate body is fixed to the fixing section,   wherein a cooling channel that passes a cooling fluid is formed between the reflecting portion of the reflector and the plate body, and   wherein the minimum width of the cooling channel is from 5 to 15 mm.