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. 10, 1979
Filed:
Feb. 14, 1978
Toyotoshi Suzuki, Tokyo, JP;
Kazunari Matsuzaki, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A camera with a shutter including opening and closing blades releasable, respectively, in response to a mechanical actuation and exposure control circuit for making an exposure which is assured by energizing the solenoid of an electromagnet with power supply from a battery. When the voltage of the battery drops below a satisfactory operating level, the opening blade is locked in automatic response to the mechanical actuation, and a shutter charging and film winding mechanism is no longer effective to operate, thereby preventing wasteful consumption of film due to blank exposures. Upon removal of the battery from a chamber therefor, the shutter charging and film winding mechanism is rendered again effective, and the release of the closing blade is mechanically retarded for a certain length of time from the mechanical release actuation of the opening blade.