Abrading – Precision device or process - or with condition responsive... – With indicating
Reexamination Certificate
2005-08-30
2005-08-30
Ackun, Jr., Jacob K. (Department: 3723)
Abrading
Precision device or process - or with condition responsive...
With indicating
C451S063000
Reexamination Certificate
active
06935925
ABSTRACT:
An in-situ technique for the acoustic emission monitoring of burnish heads while they are cleaning or burnishing magnetic media is described. The burnishing process is monitored and controlled to identify interaction or contact between the head and media due to, for example, burnish head damage, substrate curvature problems, and lube pick-up problems. A piezoelectric sensor is mounted on the burnish arm that holds the burnish heads. When head-disk interaction occurs, stress waves travel through the head to the sensor and an amplified signal is gathered in a tester database as an acoustic emission. Abnormal conditions will trigger an unusual emission that is detected to trigger an alert.
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Agrawal Parul
Baumgartner Bradley Frederick
Chu Norman
Lee Charles
Mello Tony
Ackun Jr. Jacob K.
Bracewell & Giuliani LLP
Hitachi Global Storage Technologies - Netherlands B.V.
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