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:
Aug. 05, 2014
Filed:
Dec. 22, 2012
Western Digital Technologies, Inc., Irvine, CA (US);
Hengchang Guo, Rancho Santa Margarita, CA (US);
Duc T. Phan, Saratoga, CA (US);
Yanan Huang, Torrance, CA (US);
Chuanwen Ji, Irvine, CA (US);
Yakov M. Lifschitz, San Jose, CA (US);
Western Digital Technologies, Inc., Irvine, CA (US);
Abstract
Determining a polarity of a piezoelectric (PZT) actuator of a disk drive including a disk for storing data and a head for reading and writing data. A test signal is injected into the PZT actuator and a position signal is received which indicates a position of the head over the disk resulting from the test signal. A test compensation signal is generated based on the received position signal and the polarity of the PZT actuator is determined based on a phase of the generated test compensation signal.