Advanced PZT glide head design and implementation for a small sl

Details Advanced PZT glide head design and implementation for a small sl Advanced PZT glide head design and implementation for a small sl

1993-12-27

1995-06-13

Williams, Hezron E.

Measuring and testing

Surface and cutting edge testing

73105, 73DIG4, 310318, 310348, 310365, 310366, G01B 528, H01L 41113, H01L 41047, H01L 4118

Patent

active

054232074

ABSTRACT:
An enhanced piezoelectric sensor for detecting a predetermined bending mode frequency in the vibrational response of a slider with dimensions smaller than the conventional 100% slider during contact with one or more surface asperities on a recording surface. A method for making the enhanced sensor is also disclosed. The sensor comprises a substantiality rectangular slab of piezoelectric material having a charge response which corresponds to in-plane stress under free boundary conditions. Enhancement is achieved by partitioning an upper conductive layer along the lines of symmetry of the slider's stress distribution, which is related to the piezoelectric material's generated charge. In the preferred embodiment, the conductive layer is partitioned into two electrically isolated regions symmetric about the sensor's lateral axis. The design facilitates the isolation of a high frequency bending component which has been found to be monotonic with increasing surface asperity interference.

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