Patent ID: 6167005
Filing Date: 2000-12-26
Classification: G11B

Abstract:
A tracking device to enable a writing and/or reading head to write and/or read on a data track comprising:an actuator,a driving coil used to move the actuator using a magnetical force and according to a tracking error signal,a reference signal generator which generates a reference signal having a determined voltage and frequency, the reference signal being fed to the driving coil without affecting a movement of the actuator,a sensor coil which through induction converts a magnetic field emitted from the driving coil and alternating at the determined frequency into an alternating voltage, a distance between the sensor coil and the driving coil varying proportionally to the movement of the actuator,a processor for converting the alternating voltage into a distance value which is representative of the distance between the sensor coil and the driving coil, anda controller for producing a tracking signal for the driving coil as a result of a comparison of the tracking error signal and the distance value.