Light source device and projector

#1. Field of the Invention

#The present invention relates to a light source device that has: a light-emitting tube including a light-emitting portion that generates a light beam by an electric discharge between electrodes, and sealing portions provided on both sides of the light-emitting portion; and a reflector including a neck portion provided with an insertion hole to which the light-emitting tube is inserted, and a reflecting portion integrally formed with the neck portion and having an ellipsoidal curved reflecting surface that irradiates the light beam emitted by the light-emitting portion forward after and aligns the light beam in a predetermined direction, as well as to a projector including the light source device.

#2. Description of Related Art

#FIG. 1 is a schematic illustration showing the structure of an optical system of a projector according to a first embodiment of the present invention;

#FIG. 2 is a perspective view showing an outline of the structure of a light source device of the aforesaid embodiment;

#FIG. 3 is a cross sectional view showing the structure of the light source device of the aforesaid embodiment;

#FIG. 1 is a schematic illustration showing an optical system of a projector 1 according to an embodiment of the present invention. The projector 1 is an optical equipment that modulates a light beam irradiated by a light source in accordance with image information to form an optical image, and projects the optical image on a screen in an enlarged manner, the projector 1 including a light source lamp unit 10 (light source device), an integrator illuminating optical system 20, a color-separating optical system 30, a relay optical system 35, an optical device 40 and a projection optical system 50. The optical elements of the optical systems 20, 30 and 35 are positioned and housed in a light guide 2 in which a predetermined illumination optical axis A is set.

#The light source lamp unit 10 that irradiates a light beam emitted by a light source lamp 11 forward and aligns the light beam in a predetermined direction to illuminate the optical device 40, though described below in detail, includes the light source lamp 11, an ellipsoidal reflector 212, a sub-reflection mirror 13 and a parallelizing concave lens 14.

#The light beam emitted by the light source lamp 11 is irradiated toward the front side of the device as a convergent light so that the irradiation direction thereof being aligned by the ellipsoidal reflector 212, the convergent light being parallelized by the parallelizing concave lens 14, and irradiated to the integrator illuminating optical system 20.