Abrading – Precision device or process - or with condition responsive... – Computer controlled
Patent
1992-08-28
1994-11-08
Rose, Robert A.
Abrading
Precision device or process - or with condition responsive...
Computer controlled
29603, B24B 4910
Patent
active
053615476
ABSTRACT:
A lapping control system for accurately obtaining a desired throat height of each of a plurality of batch fabricated thin film magnetic transducers, comprises a row of thin film transducers formed on a substrate, the row comprising a height defining edge and at least four spaced sensing devices, a first two of the sensing devices comprising switch devices each offset a predetermined amount from the height defining edge, and a second two of the sensing devices comprising resistive devices each offset a predetermined amount from the height defining edge, a support of mounting the row of thin film magnetic transducers in a position to lap the height defining edge of each of the thin film magnetic transducers and the sensing devices, a measuring device for measuring the resistance of the resistive devices during lapping of the height defining edge, apparatus responsive to the measured resistance and To a selected sate of at least one of the two switch devices for calibrating resistance versus throat height characteristics for each of the thin film magnetic transducers in the row, and for terminating the lapping process when a predetermined throat height is reached for each of the thin film magnetic transducers.
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Church Mark A.
Desouches Alain M.
Krebs Richard E.
International Business Machines - Corporation
Rose Robert A.
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