Optical image projector and light source device for optical image projector

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. The light source device further includes a holder provided at a front end of the ellipsoidal reflector in the light-irradiation direction to hold an outer periphery of the parallelizing lens, the holder having a double structure with an absorber for absorbing light provided on an inner side thereof.