The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 2000
Filed:
Aug. 25, 1998
Fu-Ying Huang, San Jose, CA (US);
Wayne Isami Imaino, San Jose, CA (US);
Jiann-Chang Lo, Cupertino, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A system and method for using a piezoelectric (PZT) element to simultaneously actuate and sense a displacement of an arm assembly; e.g., an assembly for reading and writing data in a storage medium. The simultaneous actuating and sensing function of the PZT is achieved by adding a high-frequency excitation to a control signal which actuates the PZT. The control signal and the high-frequency excitation cause deformation of the PZT translating into arm displacement and cause the generation of an electrical response signal by the PZT. A bridge which simulates the reactance/resistance of the PZT receives the response signal and derives from it the displacement of the arm assembly. Suitable compensation techniques for active control of the PZT and for mitigation of mechanical vibrations and other disturbances experienced by the arm assembly may then be implemented based on the displacement.