Patent ID: 6011762
Filing Date: 2000-01-04
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 condition detecting 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;a focus control means for driving said moving means on the basis of an output signal from said focus condition detecting means, and controlling the light beam so that the focus condition of the light beam becomes a prescribed focus condition; anda focus jumping means for moving the focal point of the light beam from the first information face to the second information face by driving said moving means;said focus jumping means comprising;an accelerating means for moving the focal point of the light beam from the first information face to the second information face;a timing signal generating means for generating a timing signal that operates said focus control means on the basis of an output signal from said focus condition detecting means; anda decelerating means for decelerating the moving speed of the focal point of the light beam in response to a signal from said timing signal generating means.