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Abstract

An optical information recording and/or reproducing apparatus, for performing at least one of recording and reproduction of information as irradiating a recording medium with a light beam, includes an actuator for moving the light beam relative to the medium, a position detecting circuit for detecting a position of the actuator, a circuit for generating a relative position error signal of the light beam to the medium, a control loop for controlling the actuator in accordance with the relative position error signal, a filter for differentiating an output from the position detecting circuit, and an adder for adding an output from the filter to a signal in the control loop. Another optical information recording and/or reproducing apparatus includes an actuator for moving the light beam relative to the medium in a direction traversing the tracks of the medium, a velocity detecting circuit for detecting a velocity of the actuator and outputting a real velocity signal, a circuit for generating a target moving velocity of the light beam, a control loop for controlling the velocity of the actuator, based on the real velocity signal and target velocity signal, a filter for differentiating the real velocity signal, and an adder for adding an output from the filter to a signal in the control loop.

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First Claim