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:
Mar. 10, 1981
Filed:
Apr. 26, 1979
Applicant:
Inventor:
Saburo Numata, Urawa, JP;
Assignee:
Fuji Photo Optical Co., Ltd., Omiya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354 / ; 354 24 ; 354 50 ; 354 / ;
Abstract
In a photographic camera provided with an electric shutter speed control circuit including a light measuring circuit in which scene brightness information is log-compressed and memorized by a memory circuit, the information is log-expanded by use of a decoder. A pulse generator is connected with a flip-flop group so that the pulses from the pulse generator are counted by the flip-flop group. The output of the flip-flop group is log-converted by a decoder connected therewith. The log-converted output of the decoder is compared with the output of the memory circuit by a comparator.