Patent ID: 6480444
Filing Date: 2002-11-12
Classification: G11B

Abstract:
An optical disk device reproducing information recorded on a signal recording surface of a plurality of layers an optical disk, comprising:information reading means (60) for illuminating said optical disk (1) with a beam and detecting light reflected from said optical disk (1) to read said information; acceleration means (55), when said information reading means (60) is focusing on a signal recording surface of one of said plurality of layers, for generating and providing to said information reading means (60) an acceleration signal to allow said information reading means (60) to focus on a signal recording surface of another of said plurality of layers; and deceleration means (55) for generating and providing to said information reading means (60) a deceleration signal for controlling said information reading means (60) to stop when predetermined reflected light is not obtained from said information reading means (60) within a predetermined period of time after said acceleration means supplies said acceleration signal to said information reading means (60).