Patent ID: 7852036

Claim:
A disk playback apparatus for playing back a storage-medium disk, the disk playback apparatus comprising: a pickup that reads a signal from the disk; a stepping motor that moves the pickup in a radial direction of the disk; a drive control unit that (i) detects whether or not rotation of the stepping motor for moving the pickup in a radial direction of the disk is required for tracking of the pickup, and (ii) performs a basic driving step of performing microstep driving for changing a rotation angle of the stepping motor by changing a value of a drive signal to be supplied to the stepping motor, when it is determined that the rotation is required; and a servo control unit that performs tracking servo of the pickup by controlling the drive control unit, wherein, when the drive control unit performs the microstep driving in accordance with control of the servo control unit and the stepping motor does not rotate, the drive control unit returns the value of the drive signal to a pre-change value and changes the value of the drive signal by an amount of change that is greater than an amount of change in the drive signal that was supplied when the stepping motor did not rotate.