Disk drive with capacitance sensing of disk vibration and...

Details Disk drive with capacitance sensing of disk vibration and... Disk drive with capacitance sensing of disk vibration and...

2006-03-14

2006-03-14

Sniezek, Andrew L. (Department: 2651)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S077040, C360S078110

Reexamination Certificate

active

07012777

ABSTRACT:
A data recording disk drive has a plurality of capacitive sensors, each sensor facing a surface of an associated disk, a capacitance sensing circuit for converting the sensed capacitance to a voltage representative of the distance between the sensor and the disk surface, and a feedforward controller that receives the voltage signal. The feedforward controller has a transfer function with gain and phase characteristics designed to match the transfer function from the out-of-plane disk vibration to the position of the read/write head while accounting for the effects of the sensor dynamics and the dynamics of the actuator. The output from the feedforward controller is combined with the output from the disk drive's servo feedback controller so that the effects of disk vibration on track misregistration of the head are removed from the control signal to the actuator.

REFERENCES:
patent: 6339512 (2002-01-01), Sri-Jayantha et al.
patent: 2002/0097517 (2002-07-01), Bonin et al.
patent: 2003/0072103 (2003-04-01), Kang et al.
patent: 2003/0133218 (2003-07-01), Guo et al.

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