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:
Nov. 12, 1991
Filed:
Feb. 05, 1991
Applicant:
Inventor:
Hideo Homma, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358228 ; 35821399 ;
Abstract
An exposure control device includes a first exposure control circuit which is arranged to keep constant an average signal level of an image signal corresponding to the whole of an image sensing plane, and a second exposure control circuit which is arranged to compensate the average signal level according to the level of an image signal corresponding to a light measuring area set in a part of the image sensing plane. The second exposure control circuit has a response characteristic arranged to have its exposure control action performed at a slower response speed than the first exposure circuit.