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:
Jul. 20, 1976
Filed:
Aug. 21, 1975
Applicant:
Inventors:
Yasuhiro Nanba, Osaka, JA;
Motonobu Matsuda, Izumi, JA;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ; G01J / ;
U.S. Cl.
CPC ...
354 / ; 354 51 ; 354 / ; 356226 ;
Abstract
Light responsive circuit of low current consumption and low cost and used for camera exposure control and/or exposure indication. The circuit includes a field effect transistor, a photodiode connected between gate and source of the field effect transistor, a transistor having a collector connected to the gate of the field effect transistor and further having a base connected to the source of the field effect transistor, and a control circuit for controlling base voltage of the transistor to regulate source potential of the field effect transistor.