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:
Jul. 16, 1996
Filed:
Oct. 24, 1994
Applicant:
Inventors:
Nozomu Kitagishi, Hachioji, JP;
Shoji Suzuki, Yokohama, JP;
Shuichiro Saito, Yokohama, JP;
Masaharu Suzuki, Kawasaki, JP;
Koutaro Yano, Yokohama, JP;
Toru Matsuda, Tokyo, JP;
Makoto Taniguchi, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
353101 ; 353 69 ;
Abstract
In a projection type display apparatus for illuminating a projection original image with light from a projection light source, and projecting light transmitted through the illuminated original image using a projection lens, light reflected by a projection surface is extracted from a position at an original image side of the projection lens or in the projection lens, and the extracted light is received by a focus detection unit.