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. 19, 2015
Filed:
Aug. 12, 2014
Seagate Technology Llc, Cupertino, CA (US);
Michael Thomas Johnson, Minneapolis, MN (US);
Dongming Liu, Eden Prairie, MN (US);
Huazhou Lou, Eden Prairie, MN (US);
Declan Macken, Prior Lake, MN (US);
Timothy William Stoebe, Minnetonka, MN (US);
James Gary Wessel, Savage, MN (US);
Xuan Zheng, Savage, MN (US);
SEAGATE TECHNOLOGY LLC, Cupertino, CA (US);
Abstract
A head transducer, configured to interact with a magnetic recording medium, includes a first sensor having a temperature coefficient of resistance (TCR) and configured to produce a first sensor signal, and a second sensor having a TCR and configured to produce a second sensor signal. One of the first and second sensors is situated at or near a close point of the head transducer in relation to the magnetic recording medium, and the other of the first and second sensors spaced away from the close point. Circuitry is configured to combine the first and second sensor signals and produce a combined sensor signal indicative of one or both of a change in head-medium spacing and head-medium contact. Each of the sensors may have a TCR with the same sign (positive or negative) or each sensor may have a TCR with a different sign.