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:
Apr. 23, 1985
Filed:
Feb. 27, 1984
Applicant:
Inventor:
Ryuji Tokuda, Tokyo, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G03B / ;
U.S. Cl.
CPC ...
354 21 ; 354427 ; 354428 ; 354464 ;
Abstract
An exposure control device for a camera wherein a current produced from a light sensitive element in proportion to the quantity of light incident on the element is logarithmically suppressed. A suppressed voltage obtained from this current to which voltage is added a voltage which is substantially proportional to absolute temperature and is produced according to encoded film sensitivity information expressed in the APEX system. The voltage resulting from the addition is converted into a current and expanded. The degree of an exposure is controlled on the basis of the expanded current.