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. 31, 2000
Filed:
Nov. 12, 1998
Applicant:
Inventors:
Shinji Okamori, Tokyo, JP;
Shinsuke Shikama, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
353 98 ; 353102 ; 385146 ; 359894 ;
Abstract
A light source device or a projection type display apparatus has a pillar optical element; a condenser means; and a first lens effective to focus the image of the emitting end face of the pillar optical element at a surface to be irradiated; wherein the pillar optical element includes a tapered portion on a side of the incident end face and a non-tapered pillar portion on a side of the emitting end face, a cross-sectional area of the tapered portion continuously increasing from the incident end face toward the emitting end face and a cross-sectional area of the non-tapered pillar portion being constant.