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:
May. 30, 1978
Filed:
Dec. 01, 1975
Seiko Koki Kabushiki Kaisha, , JA;
Abstract
An electrically operated shutter in which an exposure aperture is opened by actuation of a shutter blade opening member and closed by actuation of a shutter blade closing member and exposure time is controlled in accordance with the duration of excitation of an electromagnet. The shutter is comprised of a disengaging member for causing said shutter blade closing member to actuate upon being attracted to the electromagnet during excitation thereof, and an engaging member for causing the shutter blade opening member to actuate upon being actuated by the movement of a control member if the shutter is released. When the electromagnet is not normally energized, the disengaging member is engaged by a cam portion of the engaging member on the initial operating period of shutter release and disengaged upon lapse of a preselected time from the shutter opening operation.