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:
Feb. 23, 2010
Filed:
May. 01, 2007
Hiroyuki Kobayashi, Matsumoto, JP;
Shohei Fujisawa, Matsumoto, JP;
Yuji Takado, Matsumoto, JP;
Takeshi Takezawa, Matsumoto, JP;
Hiroyuki Kobayashi, Matsumoto, JP;
Shohei Fujisawa, Matsumoto, JP;
Yuji Takado, Matsumoto, JP;
Takeshi Takezawa, Matsumoto, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A light source unit including an arc tube having a light emitting section, sealed sections, an elliptic reflector, and a secondary reflecting mirror to cover the front side of the light emitting section and reflect a luminous flux radiated from the light emitting section toward the elliptic reflector. The center of discharging emission from the arc tube is disposed at a first focal position of the elliptic reflector, and the secondary reflecting mirror is configured as a separate member from the arc tube, so that the outer peripheral portion of the secondary reflecting mirror is accommodated within a circular cone connecting a second focal position of the elliptic reflector and the distal end of the front sealed section of the arc tube when being mounted to the front sealed section of the arc tube.