Piezoelectric crystal actuator and techniques for hysteresis...

Details Piezoelectric crystal actuator and techniques for hysteresis... Piezoelectric crystal actuator and techniques for hysteresis...

2007-05-22

2007-05-22

Tzeng, Fred F. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S069000

Reexamination Certificate

active

11051371

ABSTRACT:
The invention proposes the use of a piezoelectric crystal element as an actuator for data storage systems. In particular, the piezoelectric crystal element mechanically positions a head with respect to a data storage medium. More specifically, the invention may use a piezoelectric laminate crystal structure as a fine positioning actuator in a magnetic tape system in order to precisely position one or more heads with respect to tracks of the magnetic tape. Furthermore, in order to address hysteresis in the piezoelectric crystal element, the invention proposes the introduction of a high frequency periodic signal as part of the input to the piezoelectric crystal element.

REFERENCES:
patent: 5422556 (1995-06-01), Graf et al.
patent: 5450257 (1995-09-01), Tran et al.
patent: 2003/0123196 (2003-07-01), Shiraishi et al.
patent: 2005/0185344 (2005-08-01), Ito et al.
patent: 2005/0201017 (2005-09-01), Koga et al.
Co-pending U.S. Appl. No. 11/062,224, filed Feb. 18, 2005, Langlois et al., entitled “Techniques for Adjusting for Actuator Non-Linearities in a Data Storage System”.

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