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:
Jul. 22, 2003
Filed:
Nov. 30, 2000
Masahiko Shimizu, Houston, TX (US);
Yorio Takahashi, Ehime, JP;
Abstract
A disk device for controlling the revolution of a disk, and the operation of a focus coil and a tracking coil with high precision even during the low-velocity revolution of a disk is provided. A control signal gain switch circuit ( ) is provided as control signal gain switch means for switching depending on an operation state and outputting a gain of at least one of a spindle motor control signal ( ) output to a spindle motor control circuit ( ) as the first control unit for controlling a spindle motor ( ) which revolves the disk ( ), and a focus tracking control signal ( ) output to the focus tracking control circuit ( ) as the second control unit for controlling an optical pickup ( ) which reads information in the disk ( ) and outputs a high frequency signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile