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:
May. 20, 2014
Filed:
Feb. 28, 2011
Dongming Liu, Eden Prairie, MN (US);
Lin Zhou, Eagan, MN (US);
Adam K. Himes, Minneapolis, MN (US);
Lee C. Knippenberg, Burnsville, MN (US);
Michael T. Johnson, Minneapolis, MN (US);
Dongming Liu, Eden Prairie, MN (US);
Lin Zhou, Eagan, MN (US);
Adam K. Himes, Minneapolis, MN (US);
Lee C. Knippenberg, Burnsville, MN (US);
Michael T. Johnson, Minneapolis, MN (US);
Seagate Technology LLC, Cupertino, CA (US);
Abstract
A method of detecting a contact between a transducing head and a storage medium is provided. The method applies an input signal, having a select power level and known frequency, to an actuator for actuating the head. An output signal is obtained in response to the input signal. At least one signal component is extracted from the output signal at the same or a harmonic of the same known frequency as the input signal applied to the actuator. Whether the at least one extracted signal component indicates a contact between the head and the medium is determined. The power level of the applied wave pattern is increased incrementally until the extracted signal component indicates a contact between the head and the storage medium.