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:
Mar. 09, 1982
Filed:
Jul. 11, 1980
Ryuzo Motoori, Kawasaki, JP;
Nippon Kogaku K.K., Tokyo, JP;
Abstract
A motor control device includes a bridge circuit having semiconductor switching elements disposed in each arm thereof and being adapted for the connection of a motor between pairs of arms. The semiconductor switching elements are selectively rendered conductive to alternately drive the motor in forward and reverse directions, and certain ones of a semiconductor switching elements may be simultaneously rendered conductive to form a closed loop which short-circuits the motor and causes dynamic braking. The motor control device is capable of instantaneously stopping the rotation of the motor and is capable of rapidly reversing the motor's direction of rotation. The device is particularly useful in an automatic focusing apparatus or an automatic diaphragm setting apparatus in a camera.