Head positioning method, and disk apparatus using the same

Details Head positioning method, and disk apparatus using the same Head positioning method, and disk apparatus using the same

2006-03-28

2006-03-28

Wong, K. (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077040

Reexamination Certificate

active

07019938

ABSTRACT:
A first estimator13estimates the position of a head based on a VCM driving signal u1and a voltage signal Va output from a VCM6to output a first head position estimation signal x1est. The first estimator13estimates the disturbance acting on a head supporting mechanism8to output a disturbance estimation signal τdest. A second estimator15estimates the displacement of the head based on a control signal c2for a fine adjustment actuator7to output a displacement estimation signal x2est. The first head position estimation signal x1estand the displacement estimation signal x2estare added together to obtain a second head position estimation signal xest. A position error signal e is generated using a head position signal x obtained by detecting the servo information and the second head position estimation signal xest. A disturbance compensator10synthesizes a VCM control signal c1with the disturbance estimation signal τdestto generate the VCM driving signal u1.

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S. Nakamura et al., “An Electrostatic Micro Actuator for a Magnetic Head Tracking System of Hard Disk Drives”, IEEE, TRANDUCERS '97, Jun. 16-19, 1997, pp. 1081-1084.

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