Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-03-07
2006-03-07
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
Reexamination Certificate
active
07009803
ABSTRACT:
The invention operates two control paths. The micro-actuator control stimulates the micro-actuator. The voice coil motor control path includes the voice coil motor control generating a voice coil control signal, notch filtered to remove at least one significant excitation resonance for a notch filtered voice coil control signal. Amplifying the notch filtered voice coil control signal by a tuning gain stimulates the voice coil motor.A decoupling feedback filter uses the micro-actuator control signal to create a decoupling feedback signal used to decouple the two control paths. A track following command, with PES removed, directs the micro-actuator control. The voice coil motor control is directed by the track following command, with both PES and decoupling feedback signal removed.Preferably, the servo-controller digitally supports the elements of the invention. Implementing the method may preferably include the servo-controller program system residing in an accessibly coupled memory.The invention includes optimizing an implementation within the hard disk drive. The optimization may be part of the manufacturing process for the hard disk drive. The invention includes the hard disk drive as the product of that manufacturing process.
REFERENCES:
patent: 2004/0125488 (2004-07-01), Zhu et al.
Guo, Lin et al., Dual-stage Actuator Servo Control for High Density Disk Drives, IEEE/ASME International Conference on Advanced Intelligent Mechatronics, Sep. 19-23, 1999, 6 pages, Atlanta, USA.
Bell, Jon, Tunable Multi Notch Digital Filters, Sep. 27, 2000, 7 pages.
Lee Dong Jun
Lee Hyung Jai
Sharma Vinod
Aiello Jeffrey P.
GSS Law Group
Hudspeth David
Jennings Earle
Samsung Electronics Co,. Ltd.
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