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. 20, 2004
Filed:
Mar. 07, 2002
Tatsuharu Kusumoto, Higashiyamato, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
While a disk drive is operating, a retract time period, which is required for moving a head from its present position to a predetermined retract change position using a back EMF that occurs in an SPM, is determined. Upon power-off of a power supply for the disk drive, at first, a first retract operation for moving the head using the back EMF of the SPM is started. When the retract time period has elapsed after the power-off of the power supply, the first retract operation is switched to a second retract operation for moving the head onto a ramp using a charge accumulated in a retract capacitor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile