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:
Sep. 30, 2003
Filed:
Apr. 17, 2000
Wataru Tsukahara, Kawasaki, JP;
Shigenori Yanagi, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
This invention relates to a servo-control method and servo-controller of a memory storage device, as well as the memory storage device, for positioning the reading position of a head on a target position. It suppresses phase lag in the high region while preventing a decrease in follow-ability. This invention comprises a storage medium , head , actuator , detection circuit , and control circuit . The detection circuit detects the amount of shift between the reading position of the head and a target position. The control circuit performs PID calculation for the shift amount and outputs an instruction value for the actuator . There is a limiter for limiting the calculated result of the differential component of this PID calculation to a specified value. Only the high region is limited and the low region is not limited, thus it is possible to suppress phase lag in the high while maintaining follow-ability.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile