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:
Oct. 21, 2008
Filed:
Nov. 21, 2005
Ryuuji Yamada, Tokyo, JP;
Katsuyuki Takeuchi, Tokyo, JP;
Ryuuji Yamada, Tokyo, JP;
Katsuyuki Takeuchi, Tokyo, JP;
Kyocera Corporation, Kyoto, JP;
NEC Display Solutions, Ltd., Tokyo, JP;
Abstract
An illumination optical apparatus and a projection type display apparatus capable of enhancing an illumination efficiency; having an ellipsoidal mirror, a light source arranged at a first focal point of the ellipsoidal mirror, a stop arranged closer to said light source side by a predetermined distance from a second focal point of said ellipsoidal mirror, and a positive refractive collimator lens for collimating a light flux emitted from the stop to a parallel light flux. A condition (0.01<L/L) is satisfied where, Lis a distance from an apex of the ellipsoidal mirror to the second focal point thereof and, L(the light source side is a positive distance) is a distance from the second focal point of the ellipsoidal mirror to the stop.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile