Invention Grant
- Patent Title: Head transducer with multiple resistance temperature sensors for head-medium spacing and contact detection
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Application No.: US14457694Application Date: 2014-08-12
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Publication No.: US09042050B2Publication Date: 2015-05-26
- Inventor: Michael Thomas Johnson , Dongming Liu , Huazhou Lou , Declan Macken , Timothy William Stoebe , James Gary Wessel , Xuan Zheng
- Applicant: Seagate Technology LLC
- Applicant Address: US CA Cupertino
- Assignee: SEAGATE TECHNOLOGY LLC
- Current Assignee: SEAGATE TECHNOLOGY LLC
- Current Assignee Address: US CA Cupertino
- Agency: Hollingsworth Davis, LLC
- Main IPC: G11B21/02
- IPC: G11B21/02 ; G11B20/10 ; G11B5/60

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.
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