Limbach & Limbach
Disk drive servo control with pulse width and amplitude control for a position servo signal
 A disk drive servo control circuit for controlling a position of a head using servo information obtained from a disk at predetermined time intervals, the servo information being converted to a digital servo control signal which is supplied to a digital to analog (D/A) converter whose output drives a head actuator for moving the head with respect to a selected track, wherein the width of the output signal of the D/A converter is controlled to have a time interval which is shorter than the predetermined time intervals at which the servo information is reproduced, to thereby reduce the minimum resolution in the track following mode without changing the maximum current to the actuator during track seeking. 
Sony Corporation
G G
G11B G11B
inventional inventional
Yasuaki
Suzuki