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:
Feb. 21, 1978
Filed:
May. 05, 1975
Applicant:
Inventors:
Nobuyoshi Inoue, Kawagoe, JA;
Munetaka Shimizu, Kawagoe, JA;
Assignee:
Copal Company Limited, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354238 ; 354 / ; 354 50 ; 354 51 ; 354 / ; 354239 ; 354266 ; 354267 ;
Abstract
An electric shutter means so made that, in order to make the consumption of a current source battery as little as possible, during the period from the beginning of the operation of a self-timer by pressing a release button to the end of the operation, only the passage of an electric current to an electromagnet to start the motion of closing a rear blade may be prevented or a very small current may be made to flow to said electromagnet and, simultaneously with the closure of a current source switch by pressing the release button, an exposure warning circuit and exposure time indicating circuit may be held in an operating state.