Patent ID: 7954963

Claim:
A light source device comprising: a discharge lamp that generates light-source light; and a reflection mirror having a plurality of concave curved surfaces that reflect the light-source light emitted from the discharge lamp, wherein each of the plurality of concave curved surfaces is an ellipsoidal surface, a first focal point of each of the ellipsoidal surfaces that form the plurality of concave curved surfaces is disposed at the light emitting center of the discharge lamp, a second focal point of each of the ellipsoidal surfaces that form the plurality of concave curved surfaces is disposed, when viewed from a predetermined first direction perpendicular to a system optical axis passing through the light emitting center, on the opposite side of the system optical axis to the ellipsoidal surface, and when viewed from a second direction perpendicular to the system optical axis and the first direction, on the side where the ellipsoidal surface is present with reference to the system optical axis, and the reflection mirror is formed of at least four concave curved surfaces.