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:
Jan. 22, 1985
Filed:
Jul. 23, 1981
Applicant:
Inventor:
Koji Watanabe, Hachioji, JP;
Assignee:
Konishiroku Photo Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G03B / ;
U.S. Cl.
CPC ...
354478 ; 354481 ; 354200 ;
Abstract
In cameras having an automatic exposure control of the through-the-lens photometric type, light exposure is determined by a photoreceptor responsive in turn to photometric sensitivity distribution. Such distribution can be determined by overall photometry, weighted photometry and spot photometry as controlled through the use of an electro-optical element serving as a focusing screen between the reflected incoming light and the photoreceptor. The photometric mode is varied by changing the applied voltage on the electro-optical element.