Patent ID: 8128239

Claim:
A light source device comprising: a light emitting tube having a light emitting section adapted to emit light, a first sealing section disposed on one side of the light emitting section integrally with the light emitting section, and a second sealing section disposed on the other side of the light emitting section integrally with the light emitting section; a secondary reflecting mirror having a secondary reflecting surface covering a part of a periphery of the light emitting section, and adapted to reflect light emitted from the light emitting section; and a primary reflecting mirror having a primary reflecting surface adapted to reflect the light emitted from the light emitting section and the light reflected by the secondary reflecting mirror, wherein the secondary reflecting mirror has a shape with which a first reference plane determined based on a first boundary line as a boundary between the light emitting section and the first sealing section and the secondary reflecting surface fail to intersect with each other.