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:
Nov. 27, 2001
Filed:
Mar. 09, 2000
Yasuhiro Miyagoe, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A motor driving device for keeping the rotation speed of a spindle motor has a detector for detecting the rotation rate of the motor and a circuit for producing an error voltage that represents the error of the detected rotation rate from the specified rotation rate. In accordance with the error voltage, the amplitude of the driving signal of the motor is controlled. As the error voltage becomes lower, the amplitude of the driving signal is increased to supply more current to the motor. To prevent an overcurrent through the motor, a current limiter circuit is provided. When the error voltage is lower than the current limit voltage output from the current limiter circuit, the driving signal is controlled in accordance with the current limit voltage instead of the error voltage. The current limiter circuit is so configured that the current limit voltage does not vary with temperature.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile