The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 2003
Filed:
Aug. 09, 2001
Takeshi Ishihara, Tokyo, JP;
NEC Microwave Tube, Ltd., Kanagawa, JP;
Abstract
A light source device includes a discharge lamp having a tubular transparent bulb with sealed opposite ends for generating discharged light near a light emission center thereof, and a reflecting mirror having a reflecting surface which has a curved surface approximating a paraboloid whose focal point is positioned at the light emission center of the transparent bulb. The reflecting surface is divided by a boundary into a first curved surface extending from the boundary toward a closed end of the reflecting mirror and a second curved surface extending from the boundary toward an open end of the reflecting mirror. The first curved surface is shaped such that the angle of incidence of a ray of light emitted from the light emission center and applied to the first curved surface is progressively smaller toward the closed end, and changes of the angle of incidence are greater than changes of the angle of incidence of a ray of light on the paraboloid.