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. 19, 1998
Filed:
Sep. 26, 1995
Applicant:
Inventor:
Kazuo Fujibayashi, Kawasaki, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
355 45 ; 355 55 ;
Abstract
In an image forming apparatus, an image illuminated by an illumination device is projected on a screen or on a recording medium. The focus state of the projected image is detected by a focus detection unit. At least a part of the focus detection unit is moved to detect the focus state over plural areas in the projected image.