Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Piezoelectric crystal testing
Reexamination Certificate
2005-03-01
2005-03-01
Le, N. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Piezoelectric crystal testing
C324S076490
Reexamination Certificate
active
06861854
ABSTRACT:
A test device and method for testing one of a disk drive microactuator and a disk drive sensor that includes two piezoelectric elements. The test device includes a signal generator, signal analyzer, and a user interface. The test device is operational to provide a reference signal (e.g. an electrical signal) to one of the piezoelectric elements in the microactuator and obtain a test measure from the other one of the piezoelectric elements. The test measure is then utilized to assess a performance parameter for the microactuator. The test measure is generated by the other one of the piezoelectric elements in response to the reference signal provided to the first one of the piezoelectric elements. In one embodiment of the invention, the test measure is a signal generated in response to the reference signal that may be compared to a known response signal of an operational microactuator to determine operational characteristics of a subject microactuator such as circuitry operation and/or damage to the microactuator.
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Magnetic Disk Drive Technologyby Dr. Kanu G. Ashar, copyright 1997 by the Institute of Electrical and Electronics Engineers, Inc.; pp. 285-288.
Guo Wei
Hatch Michael R.
Benson Walter
Le N.
Marsh & Fischmann & Breyfogle LLP
Maxtor Corporation
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