Patent ID: 7001027
Filing Date: 2006-02-21
Classification: F21V,H01J,H04N

Abstract:
1. A light source device, comprising: 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 and aligns the light beam in a predetermined direction, wherein the light-emitting tube has a sub-reflection mirror that covers substantially front half of the light-emitting portion, wherein the reflector has a step formed between the peripheral edge of an opening end of the insertion hole near the reflecting surface and the reflecting surface, wherein the external diameter of the step is larger than the external diameter of the sub-reflection mirror while the external diameter of the step is within internal the diameter of a valid reflection area of the reflector, the internal diameter being defined by a focal position on the front side of the reflector and the outer periphery of the sub-reflection mirror, and wherein the step has a part where the reflecting surface is not deposited on the border with the valid reflection area.