Patent ID: 8179754

Claim:
An optical disc apparatus for reading information recorded on an optical disc medium, comprising: an optical pickup for outputting an output signal according to the information recorded on the optical disc medium; a servo implementation unit for controlling a relative position of the optical pickup with respect to a surface of the optical disc medium according to the output signal of the optical pickup to implement servo control for maintaining a state where the information is readable from the optical disc medium; evaluation value acquisition means for acquiring an evaluation value for information reading accuracy of the optical pickup when the servo control is implemented; and parameter adjustment means for calculating a set value of a predetermined parameter to be set for the implementation of the servo control based on the evaluation value acquired by the evaluation value acquisition means for each of at least four set values of the predetermined parameter while changing the set value of the predetermined parameter, wherein the parameter adjustment means determines the set value for a fourth measurement according to a magnitude relation between two evaluation values acquired respectively for a maximum value and a minimum value of the set values used for three previous measurements.