Optical disc device, control method thereof, program, and information storage medium

摘要

An optical disc device that reads information recorded in an optical disc medium includes an objective lens that focuses light on the optical disc medium, a spherical aberration correction mechanism that changes an amount of spherical aberration of the objective lens according to a setting value of a predetermined parameter, and an evaluation value measurement section that measures an evaluation value indicating the accuracy of reading of information from the optical disc medium. The optical disc device further includes a control section that executes adjustment processing in which the control section carries out plural times of measurement of the evaluation value by the evaluation value measurement section concurrently with changing the amount of spherical aberration of the objective lens by the spherical aberration correction mechanism and calculates an optimum setting value of the parameter based on plural evaluation values obtained by the plural times of measurement.

主权项

1. An optical disc device that reads information recorded in an optical disc medium, the optical disc device comprising:
an objective lens configured to focus light on the optical disc medium; a spherical aberration correction mechanism configured to change an amount of spherical aberration of the objective lens according to a setting value of a predetermined parameter; an evaluation value measurement section configured to measure an evaluation value indicating accuracy of reading of information from the optical disc medium; and a control section configured to execute adjustment processing in which the control section carries out a plurality of times of measurement of the evaluation value by the evaluation value measurement section concurrently with changing the amount of spherical aberration of the objective lens by the spherical aberration correction mechanism and calculates an optimum setting value of the parameter based on a plurality of evaluation values obtained by the plurality of times of measurement; wherein the plurality of times of measurement of the evaluation value by the evaluation value measurement section is performed while an on-state of a collimator lens drive signal continues and while the collimator lens moves toward a constant direction; and wherein a tracking servo control signal of the optical disc device is turned off from the first of the plurality of times of measurement of the evaluation value through to the calculation of the optimum setting value of the parameter.