Patent ID: 8287139

Claim:
A light source device, comprising: an arc tube that includes a tube spherical portion containing a pair of electrodes disposed along an illumination axis, and a pair of sealing portions extending from both sides of the tube spherical portion; a reflector disposed in the vicinity of one of the sealing portions of the arc tube to reflect light emitted from the arc tube toward an illumination area; and a sub mirror configured to reflect the light emitted from the arc tube toward the arc tube, and disposed at a side of another sealing portion in such a manner as to cover a part of the outer surface of the tube spherical portion on a side of the illumination area, the sub mirror including a plurality of reflection members provided with reflection surfaces having different shapes, and a distance between the illumination axis and an outer shape of one of adjoining reflection members being different from a distance between the illumination axis and the other of the adjoining reflection members for making a clearance between each other.