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:
Apr. 04, 2000
Filed:
Aug. 30, 1996
Randall David Hampshire, Agra, OK (US);
Seagate Technology, Inc., Scotts Valley, CA (US);
Abstract
Apparatus and method for providing a linearized position error signal in a disc drive. A first servo position error signal is generated by the disc drive as a selected combination of servo burst signals received as a disc drive head passes over servo burst fields of a selected track, the first servo position error signal having a magnitude indicative of the position of the head relative to the selected track. A second servo position error signal is also generated by the disc drive as a selected combination of the servo burst signals, the magnitude of the second servo position error signal being different from the magnitude of the first servo position error signal for at least a portion of the width of the selected track. A third servo position error signal is generated as a selectively weighted sum of the first and second servo position error signals, the weighting of the first and second servo position error signals selected to provide the third servo position error signal with nominally constant gain across the width of the selected track. The third servo position error signal is used to generate correction signals which control the amount of current applied to an actuator coil in order to control the position of the head with respect to the selected track.