Patent ID: 7819531
Filing Date: 2010-10-26
Classification: F21V,G03B,H04N,H05B,Y02B

Abstract:
1. A light source device comprising: first and second electrodes that produces luminescence by discharge; an arc tube having a main body section having a discharge space in which the first and second electrodes are disposed with a distance and a sealing section disposed on each of the both ends of the main body section; a primary reflecting mirror disposed on the side of the first electrode, and that reflects a light generated by discharge between the first and second electrodes to emit the light towards an area to be illuminated; a secondary reflecting mirror disposed on the side of the second electrode facing the primary reflecting mirror, and that reflects the light towards the side of the primary reflecting mirror; and a current drive device that generates an alternating current for causing the discharge between the first and second electrodes, and that performs power control, by controlling the alternating current so that supplying energy in an anodic term of the first electrode becomes smaller than supplying energy in a cathode term.