Patent ID: 6236629
Filing Date: 2001-05-22
Classification: G11B

Abstract:
An optical disk device for reading or storing data on an optical disk on which a reference signal of a frequency element is provided along a guide groove at a transfer rate, comprising:rotation means for rotating the optical disk at an optional number of rotations;rotation control means for controlling rotation of the optical disk;frequency extract means for extracting a frequency element of the reference signal;clock extract means for extracting a clock element from the reference signal;linear speed detection means for detecting a linear speed of the optical disk; andresponse switch means for switching a response of said clock extract means,said device being configured that storage data to be stored on the optical disk is generated according to a clock output from said clock extract means,wherein when a linear speed detected by said linear speed detection means is within a predetermined range of linear speed at which data can be stored on the optical disk or when it is determined that the linear speed is within a predetermined range of linear speed change rate, the response of said clock extract means is set at a low speed.