Patent ID: 6597115
Filing Date: 2003-07-22
Classification: H01J

Abstract:
A light source device for a video monitor of the rear projection type, in which light is emitted in a direction of a tilted rear reflector and is reflected onto a substantially vertical screen, said light source device comprising:a concave reflector with a middle opening and an optical axis, said optical axis being positioned tilted obliquely out of a plane substantially parallel to the substantially vertical screen in a direction of the rear reflector; and a discharge lamp operable via application of direct current, said discharge lamp including an emission part with a cathode and an anode located opposite to one another and being supported by hermetically sealed portions of said emission part, one of said hermetically sealed portions being mounted in said middle opening of said concave reflector in a manner that a lengthwise axis of said discharge lamp substantially aligns with said optical axis of said concave reflector; wherein said anode of said discharge lamp is positioned closer to the rear reflector than said cathode of said discharge lamp, and a tip of said anode is positioned underneath an obliquely tilted plane that includes said lengthwise axis of said discharge lamp.