Abstract: A light source device includes: a light-emitting tube having a light-emitting portion that generates a light beam by an electric discharge between electrodes and a sealing portion provided on both sides of the light-emitting portion; an ellipsoidal reflector having a substantially ellipsoidal reflecting surface and irradiating the light beam irradiated by the light-emitting tube after converging at a predetermined position; a sub-reflection mirror having a reflecting surface opposed to the reflecting surface of the ellipsoidal reflector and covering the front side of the light-emitting tube in the light-irradiation direction to reflect the light beam emitted by the light-emitting tube toward the ellipsoidal reflector; and a transparent member provided in front of the ellipsoidal reflector in the light-irradiation direction to transmit the light beam.

Abstract: The invention provides a light source and a projector with sufficiently high luminance and size reduction for related art lamps, an increased lamp lifetime, and reduced noises from a cooling fan. A light source, source includes a concave mirror which has a reflecting part that reflects light, non-reflecting parts adjacent to this reflecting part, and permeable ports that pass through the non-reflecting parts, and which opens forward; a lamp which is arranged in this concave mirror and emits the light; and a light permeable member which covers the opening part of the concave mirror. The concave mirror includes a mesh arranged in a position where it covers the permeable port, and a protective wall to protect the mesh, which is arranged in a position where direct collision between the mesh and broken pieces of the lamp made by a burst of the lamp is reduced or prevented.