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:
Mar. 25, 2014
Filed:
Jun. 28, 2012
Noureddine Kermiche, Dana Point, CA (US);
Xianghui Xiao, Irvine, CA (US);
Noureddine Kermiche, Dana Point, CA (US);
Xianghui Xiao, Irvine, CA (US);
Western Digital Technologies, Inc., Irvine, CA (US);
Abstract
A disk drive is disclosed comprising a head actuated over a disk, a dynamic fly height (DFH) actuator operable to control a fly height of the head over the disk, and a touchdown (TD) sensor operable to generate a TD signal. A periodic control signal is applied to the DFH actuator to generate a periodic response in the TD signal comprising at least one cycle, wherein the cycle comprises a first half cycle and a second half cycle. An anti-correlation is computed between the first half cycle and the second half cycle of the TD signal, and the head contacting the disk is detected in response to the anti-correlation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile