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:
Jan. 10, 2012
Filed:
Jan. 23, 2009
Toshiya Suzuki, Kyoto, JP;
Toshiya Suzuki, Kyoto, JP;
Rohm Co., Ltd., , JP;
Abstract
One terminal of a first capacitor is set to a fixed electric potential. A charging/discharging circuit charges/discharges the first capacitor using a current that corresponds to an input signal which specifies the revolution of a motor. A comparator compares a voltage at the first capacitor with a predetermined voltage. A control signal generating unit generates a control voltage having a level that corresponds to an edge timing of a frequency signal synchronized with the rotation of the motor and an edge timing of the comparison signal output from the first comparator. Furthermore, the control signal generating unit switches the charging/discharging state of a charging/discharging circuit according to an edge of the periodic signal and an edge of the comparison signal. The motor is driven with a torque according to the control voltage.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile