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:
May. 04, 1993
Filed:
Sep. 03, 1991
Applicant:
Inventors:
Tsuyoshi Naraki, Tokyo, JP;
Haruo Ozawa, Tokyo, JP;
Takashi Mori, Kawasaki, JP;
Jun Nagatsuka, Kawasaki, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F21V / ;
U.S. Cl.
CPC ...
362373 ; 362294 ; 362345 ; 392426 ;
Abstract
A light source device houses a lamp such as a mercury discharge tube for generating a high temperature heat, and a reflective optical member such as an elliptic, mirror surrounding the lamp, in a lamp case. When the lamp is forcibly cooled by air, a device for substantially uniformly heating or heat-insulating a reflection surface of the reflective optical member is provided to prevent overcooling of the reflective optical member.