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, 1995
Filed:
Jun. 28, 1993
Kazuo Akimoto, Chiba, JP;
Toshiaki Hirai, Chiba, JP;
Seikosha Co. Ltd., Tokyo, JP;
Abstract
A motor driven shutter is activated by a single motor whose clockwise and counterclockwise rotations may be controlled. The motor driven shutter includes a driving member whose clockwise and counterclockwise rotations are controlled by the motor and having first and second control portions. An opening member is activated by the first control portion; and an opening spring biases the opening member in the direction of opening the shutter. A first electromagnet controls the activation timing of the opening member and resists the bias of the opening spring. A closing member is activated by the second control portion; and a closing spring biases the closing member in the direction of closing the shutter. A second electromagnet constrains the activation timing of the closing member and resists the bias of the closing spring. A selecting circuit selects excitation and demagnetization of the first and second electromagnets, the selecting circuit controlling a plural time excitation or demagnetization of the first and second electromagnets to carry out shutter opening and closing operations by the opening member and the closing member.