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:
Dec. 14, 1993
Filed:
Apr. 10, 1992
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A driving device for a multipolar type linear DC motor using a PWM (pulse width modulation) driving signal for driving a linear DC motor by causing an excitation coil of the motor, placed in alternating fields, to generate an induction field, and switching polarities of the induction field. The device includes a magnet polarity detecting circuit for detecting a direction of a magnetic field acting on the excitation coil in the alternating fields, an electric filter for removing an output signal output from the magnet polarity detecting circuit and having the same period as a PWM drive period, and polarity switching control circuit for controlling a direction and generation time of an induction field generated by the excitation coil in accordance with an output signal from the magnet polarity detecting circuit.