Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Reexamination Certificate
2006-03-07
2006-03-07
Sniezek, Andrew L. (Department: 2651)
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
C360S078050, C073S865900
Reexamination Certificate
active
07009804
ABSTRACT:
A sinusoidal signal is added to the notch filtered micro-actuator control signal stimulating the micro-actuator. The voice coil control signal is notch filtered to remove the frequency component of the sinusoidal signal before it stimulates the voice coil motor. The micro-actuator control signal is notch filtered to remove the frequency component of the sinusoidal signal before it stimulates the micro-actuator. The response of the system is measured as the Position Error Signal (PES), for the magnetic head moved by the micro-actuator. The measured PES is then demodulated at the frequency of the sinusoidal signal to create a measured amplitude. The stroke sensitivity is then calculated from the measured amplitude and amplitude of the sinusoidal stimulus. The frequency of the sinusoidal signal and notch filters is essentially the same, chosen away from significant excitation frequencies and outside the bandwidth of the servo system. The invention includes using multiple frequencies, as well as various formulas for the stroke sensitivity. The invention may be applied to more than one micro-actuator within the hard disk drive to create a stroke sensitivity for each micro-actuator, a combination, or for all micro-actuators. The invention includes the method implemented using a servo-controller, as well as the program system for the servo-controller, at least partly implementing the method.
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Lee Hyung Jai
Sharma Vinod
Aiello Jeffrey P.
GSS Law Group
Jennings Earle
Samsung Electronics Co,. Ltd.
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