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Efficient Piezoelectric Glide Transducer for Magnetic Recording Disk Quality Assurance

IP.com Disclosure Number: IPCOM000121594D
Original Publication Date: 1991-Sep-01
Included in the Prior Art Database: 2005-Apr-03
Document File: 1 page(s) / 38K

Publishing Venue

IBM

Related People

Patel, JP: AUTHOR [+2]

Abstract

A transducer is described for monitoring and analyzing the interface between a read-write head and a magnetic recording disk.

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Efficient Piezoelectric Glide Transducer for Magnetic Recording Disk
Quality Assurance

      A transducer is described for monitoring and analyzing
the interface between a read-write head and a magnetic recording
disk.

      The transducer comprises a piezoelectric element 1 bonded to
the magnetic head slider 2 before suspension mounting, and the
piezoelectric element extends substantially the entire surface of the
slider 2.  The sensing electrodes 3 and 4 are both bonded to the top
of the piezoelectric element 1, so that both halves of the
piezoelectric element 1 are active, but one half is oppositely poled
with respect to the other.  In this arrangement the bottom electroded
surface 5 of the piezoelectric element 1 does not need to be
connected to the sensing circuitry since it merely acts as a shorting
plane. The suspension is attached as shown in the dashed lines 6.

      The described transducer offers significant improvement in
performance due to its high degree of symmetry so that only three
mechanical modes are sensed in a broad range of frequencies.  Further
electrical filtering can substantially reduce any other sensed modes,
thereby permitting more sensitive measurements to be made and making
it much easier to interpret the output signal from the transducer.