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:
Jan. 22, 1985
Filed:
Oct. 25, 1982
Tomio Kurosu, Iwatsuki, JP;
Yukio Yoshikawa, Tokyo, JP;
Copal Company Limited, Tokyo, JP;
Abstract
The electromagnetic shutter in a camera having an exposure control circuit comprises shutter blades for opening and closing the aperture of the shutter, a shutter control circuit having a photoelectric element for measuring the scene brightness so as to generate the proper exposure signal, holding means for releasably holding the shutter blades in closed positions, spring means for opening the shutter blades when the shutter blades in the closed positions are released, and electromagnetic driving means actuated by the proper exposure signal for driving the shutter blades from the open positions to the closed positions against the action of spring means so as to permit the shutter blades to be held in the closed positions by the holding means. An energy saving is thereby achieved, because it is only necessary to actuate the holding means so as to release the shutter blades in the closed positions to open the shutter blades by the action of the spring means and to actuate the electromagnetic driving means for moving the shutter blades from open positions to closed positions at which the shutter blades are retained by the holding means.