Patent ID: 6970404

Claim:
An information recording/reproducing apparatus comprising: a light source; a focusing optical system for focusing light emitted from the light source on an information recording medium as a light spot; an error signal generation system for generating an error signal that represents a positional deviation between an information track and the light spot on the information recording medium by convening light reflected from the information recording medium into an electric signal; a control system for controlling the light spot to follow the information track by using the error signal; a tilt measurement system for measuring a relative inclination between the information recording medium and the focusing optical system; and an offset application system for shifting the light spot with respect to the information track in accordance with a signal from the tilt measurement system; wherein the offset application system generates an electronic offset by multiplying an electric signal from the tilt measurement system that corresponds to the relative inclination between the information recording medium and the focusing optical system by a predetermined constant, and shifts the light spot with respect to the information track by applying the electric offset to the error signal.