Patent ID: 6298019
Filing Date: 2001-10-02
Classification: G11B

Abstract:
An optical disk apparatus comprising:a focusing means for focusing a light beam on a recording medium having first and second information faces;a moving means for moving a focal point of the light beam focused by said focusing means in a direction substantially perpendicular to the information faces of the recording medium;a light detecting means for detecting a reflected light of the focused light beam from the recording medium;a focus control means for detecting a focus condition of the light beam irradiating the information faces on the basis of an output signal from said light detecting means, driving said moving means on the basis of the detection signal, and controlling the light beam so that the focus condition of the light beam becomes a prescribed focus condition;a focus jumping means for jumping the focal point of the light beam to a target information face which is one of the first information face and the second information face by driving said moving means; anda storage means for storing signals obtained when the focal point of the light beam is passed through the first and second information faces by driving said moving means so that the light beam goes away from or close to the recording medium;wherein, when a focus jumping is performed by said focus jumping means, a gain of said focus control means is changed according to the values stored in said storage means.