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. 21, 2003
Filed:
May. 18, 2000
Toshiro Hattori, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A positioning control system for a disk drive can reduce static friction of the sliding type actuator to be a cause of degradation of low order spindle rotation synchronization run-out. The positioning control system includes position error detecting means for detecting a position error between a center of a data track on a disk medium and a head for reading data from the disk medium, shifting means for shifting the head, a phase compensator for positioning the head at a target position on the basis of a result of detection of the position error detecting means, detecting means for detecting influence of a static frictional force for the shifting means based on an output of the phase compensator, a friction compensator outputting a feed forward signal for driving the shifting means, and means for applying the feed forward signal from the friction compensator to the shifting means from the friction compensator when influence of the static frictional force to the shifting means is detected by the detecting means.