Optical information processing apparatus in which the offset of a tracking error signal is corrected in accordance with a relationship stored in a memory, in response to a position detection output signal

摘要

An optical information processing apparatus includes an optical head for irradiating a light beam onto an optical recording medium, an objective lens, mounted on the optical head, for condensing the light beam onto the recording medium, a photodetector for receiving a light beam from the recording medium and for generating a tracking error signal indicative of a positional deviation between a light beam irradiated position and a track, a tracking actuator for moving the objective lens in a direction intersecting tracks of the recording medium, a tracking controller for driving the tracking actuator in accordance with the tracking error signal so as to correct the positional deviation, a position detector for detecting a relative position of the objective lens with respect to the optical head in the direction intersecting the tracks, a measuring device for measuring a relationship between an offset of the tracking error signal and a position of the objective lens from the tracking error signal and an output of the position detector, a memory for storing the relationship measured by the measuring device and a correction device for correcting the offset of the tracking error signal in accordance with the stored relationship, in response to the position detector output signal.