Head-positioning system with an improved fine tracking actuator control scheme

Abstract

To provide head-positioning system which can control tracking movement of the magnetic head reliably and smoothly with a high speed, enlarging the controllable frequency band of a fine tracking actuator by suppressing interference between the fine tracking actuator and a main actuator (27), a head-position control circuit of the head-positioning system comprises: a phase compensating controller (31) for obtaining deviation information of the read/write head relative to a designated position from the positional information (S12) detected by the read/write head, and generating a positioning correcting signal (S31) for feedback-controlling the fine tracking actuator to drive the slider supporting spring (22) with a torque value to make the read/write head follow the designated position, according to the deviation information (S12); and a vibration suppressing controller (32) for forward-controlling the main actuator to maintain an angular position of carriages (25) to be fixed by controlling the main actuator (27) to generate the same torque value with the torque value to be generated by the fine tracking actuator, referring to the positioning correcting signal (S31).

Dependencies are inferred from the claim text.