Patent ID: 7801013

Claim:
An optical pickup apparatus for recording and/or reproducing information on an optical disc in which information can be recorded at a plurality of recording positions each of which is located at a different distance from a surface of the optical disc, the optical pickup apparatus comprising: a light source for emitting a light flux; a relay optical system for receiving the light flux emitted from the light source; an objective lens for receiving the light flux emitted from the light source through the relay optical system and converging the light flux onto one of the plurality of recording positions; a photodetector for receiving a light flux emitted from the optical disc; a detector for detecting information for keeping a distance between the optical disc and the objective lens a predetermined value; a first actuator for driving the objective lens so as to displace the objective lens in a direction of an optical axis of the objective lens based on a signal from the detector, for keeping the distance between the optical disc and the objective lens the predetermined value irrespective of the plurality of recording positions; and a second actuator for driving the relay optical system so as to displace the relay optical system in a direction of an optical axis of the relay optical system, corresponding to one of the plurality of recording positions where information is recorded and/or reproduced.