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:
Sep. 19, 2006
Filed:
Jul. 16, 2004
Applicant:
Masaharu Eguchi, Tochigi, JP;
Inventor:
Masaharu Eguchi, Tochigi, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B 21/26 (2006.01); G03B 21/14 (2006.01); G03B 3/00 (2006.01); H04N 3/22 (2006.01);
U.S. Cl.
CPC ...
Abstract
An image projection apparatus is disclosed with which problems, caused by performing focusing control in a state in which the light amount of a light source is insufficient, can be avoided. The image projection apparatus comprises a controller, performing focusing control of a projection optical system, and a brightness detector which detects at least one of a brightness of the light source and a brightness of a reflected light on a projection surface. After turning the light source on, the controller restricts the focusing control until the brightness detected by the brightness detector reaches a predetermined value.