Patent ID: RE43777

Claim:
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.