G - Physics – 11 – B
Patent
G - Physics
11
B
352/30.4
G11B 17/08 (2006.01) G11B 5/55 (2006.01) G11B 5/596 (2006.01) G11B 17/00 (2006.01)
Patent
CA 1097805
ABSTRACT Servo apparatus for controlling position and movement of a transducer over information tracks recorded on a movable record medium and containing pre-recorded servo information which when read by the transducer generates servo signals, comprises control means arranged to receive the servo signals and to generate a position error signal therefrom indicative by its magnitude and polarity of the degree and direction of off-set of the head from the on-track position. The position error signal is supplied during track following operations to an actuator mechanism connected to the transducer so that the actuator mechanism is energized in response to the position error signal to move the transducer in a direction to reduce the off-set of the transducer from the on-track position. The control means is further arranged during track access operations to sample the servo signals from the transducer at times calculated to coincide with the on-track positions of the transducer moving across the tracks and to supply position error signals derived from the sampled servo signals to the actuator mechanism which is energized in response thereto to change the velocity of the trans- ducer across the tracks by an amount determined by the position error signals. UK9-75-014
281860
International Business Machines Corporation
Kerr Alexander
LandOfFree
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