| 摘要 |
PROBLEM TO BE SOLVED: To provide a sensor device to measure friction force at a head-media interface.SOLUTION: The sensor device has a transducer element oriented to provide an electrical output responsive to force or strain applied to the transducer element along an in-plane axis. Sensor circuitry is coupled to the transducer element to process the electrical output to provide an output measure of friction force. In illustrated embodiments, the head includes an actuator element which is powered on/off at an on/off frequency to cyclically protrude a localized portion of the head. The on/off frequency of the actuator is used by the sensor circuitry to detect excitation of the sensor element due to friction force at the head-media interface. |
