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:
Nov. 05, 2002
Filed:
Aug. 23, 2000
Seiichi Oishi, Chiba-ken, JP;
Seiichi Imano, Chiba-ken, JP;
Seiko Precision Inc., , JP;
Abstract
A shutter for a camera comprises sectors for opening and closing a shutter opening by reciprocal pivotal movement, a motor for reciprocally and pivotally moving the sectors by forwardly and reversely rotating a rotor of the motor by forward and reverse electricity conduction to a coil, a memory circuit having stored therein electricity conduction data of the coil corresponding to operational characteristics of the motor and the sectors, and a control circuit for controlling electricity conduction to the coil in accordance with a brightness of an object to be photographed and executing exposure control in accordance with the brightness of the object. The electricity conduction data includes reverse pulses for rotating the rotor in a direction reverse to a direction of opening the sectors for reducing acceleration of the sectors during opening movement thereof, and forward pulses for rotating the rotor in the direction of opening the sectors for continuing the opening movement of the sectors.