Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Piezoelectric crystal testing
Reexamination Certificate
2005-03-22
2005-03-22
Nguyen, Vincent Q. (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Piezoelectric crystal testing
53, 53, 53
Reexamination Certificate
active
06870377
ABSTRACT:
Method and apparatus for detecting failure in a piezoelectric element on a head suspension for a disk drive by clamping one end of the suspension, mechanically displacing and rapidly releasing the other end of the suspension, monitoring the electrical output of a piezoelectric element on the suspension and comparing the output with a predetermined output, using a clamp, motion actuator, and signal processor. The comparison may be with a predetermined voltage, and the output may be a natural frequency having a fundamental frequency corresponding to individual failure modes including adhesive fracture, piezoelectric element fracture, poling failure or a broken electrical connection.
REFERENCES:
patent: 5557183 (1996-09-01), Bates et al.
Faegre & Benson LLP
Hutchinson Technology Incorporated
Nguyen Vincent Q.
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