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. 03, 1987
Filed:
Aug. 15, 1985
Manabu Sawaki, Saitama, JP;
Pioneer Electronic Corporation, Tokyo, JP;
Abstract
A driving circuit for a DC motor in which the accuracy of the voltage applied to the motor when it is driven with a fixed voltage is improved and the fixed voltage is continuously applied for fixed-speed rotation control. The emitter of a motor driving transistor is connected to the first terminal of the DC motor, the other terminal of which serves as a reference terminal. A voltage is supplied between the collector of the transistor and the reference terminal of the motor, and a bias current is supplied to the base of the transistor. A voltage source produces a voltage which is at a fixed level with respect to the potential of the reference terminal of the motor. A diode arrangement, preferably composed of serially connected transistors each of which has its collector and base connected together, passes current between the voltage source and the base of the driving transistor.