Patent ID: 7484853

Claim:
A light source device, comprising: a light emitting tube having a light emitting portion that generates light by an electric discharge between a pair of electrodes and first and second sealed portions provided on either side of the light emitting portion; a main reflecting mirror provided along a first sealed portion of the light emitting tube and having a main reflecting portion that reflects light radiated from the light emitting tube so as to converge at a predetermined position; and a sub-reflecting mirror provided along a second sealed portion of the light emitting tube and having a sub-reflecting portion and a base portion, the sub-reflecting portion sending light radiated from the light emitting tube toward a side opposite to the main reflecting mirror back to the light emitting portion of the light emitting tube, and the base portion being provided at a side of the second sealed portion of the sub-reflecting portion and formed to have a shape stepped with respect to the sub-reflecting portion, wherein the sub-reflecting mirror includes a supporting portion fixed around the second sealed portion; and the base portion is formed between the sub-reflecting portion and the supporting portion in a circular shape.