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. 30, 1976
Filed:
May. 06, 1975
Applicant:
Inventors:
Nobuyoshi Inoue, Kawagoe, JA;
Kenta Namioka, Tokyo, JA;
Assignee:
Copal Company Limited, Tokyo, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354 50 ; 354 / ; 354 / ; 354234 ;
Abstract
An electric shutter means which comprises a voltage checking circuit connected to an exposure time control circuit including an electromagnet for controlling the time of closing shutter blades so that, when the voltage of a power source battery for said exposure time control circuit has dropped to be below a predetermined level, the passage of electricity to said electromagnet may be forcibly interrupted by said voltage checking circuit.