APPARATUS AND METHOD FOR DETECTING HEAD-MEDIA CONTACT

摘要

PROBLEM TO BE SOLVED: To provide an apparatus for detecting head-media contact in which a temperature sensor of a head transducer measures temperature near or at the close point.

SOLUTION: Measured temperature varies in response to changes in spacing between a head transducer and a magnetic recording medium. A detector is coupled to a temperature sensor and is configured to detect a change in a DC component of the measured temperature indicative of onset of contact between the head transducer and the medium. Another head transducer configuration includes a sensor having a sensing element with a high temperature coefficient of resistance to interact with asperities of the medium. Since electrically conductive leads are connected to the sensing element and have a low temperature coefficient of resistance relative to that of the sensing element, such thermally induced resistance changes in the leads have a negligible effect on a response of the sensing element to contact with the asperities.

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