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. 08, 1977
Filed:
Jan. 10, 1974
Canon Kabushiki Kaisha, Tokyo, JA;
Abstract
An electromagnet release device for a motion picture camera having a drive motor, a shutter control member actuated by the driving force of the motor, a blocking mechanism to selectively block the actuation of the shutter control member, an electromagnet member to control the actuation of the blocking mechanism and a release control switching member with a delay circuit having a charging circuit that delays, for a predetermined time, the timing of the actuation of the motor relative to the timing of the actuation of the electromagnet and a discharging circuit to keep the motor energized for a period after the electromagnet is released to assure the driving of the shutter to the proper stop position. Circuits are also shown for reducing magnet current during continuous operation and for timing the operated period of the electromagnet in single frame operation.