Patent ID: 6980499
Filing Date: 2005-12-27
Classification: G11B

Abstract:
1. A data recording clock signal generator that generates a recording clock signal synchronous with a wobble signal used for recording data on an optical disk having a data recording track wobbled by the wobble signal having predetermined frequency components, said data recording clock generator comprising: a wobble signal extracting unit that extracts the wobble signal; a recording clock signal dividing unit that generates a divided clock signal obtained by dividing the frequency of the recording clock signal; a phase difference signal generating unit that generates a phase difference signal as a result of phase comparison between the wobble signal and the divided clock signal; a frequency control signal generating unit that generates a frequency control signal based on the phase difference signal generated by the phase difference signal generating unit; and a recording clock signal generating unit that generates the recording clock signal having a frequency controlled in accordance with the frequency control signal generated by the frequency control signal generator, wherein the recording clock signal dividing unit is provided with a frequency dividing rate setting unit that sets, in accordance with predetermined procedures, a reference frequency dividing rate and a frequency dividing rate different from the reference frequency dividing rate by which the frequency of the recording clock signal is divided, and wherein a time period, over which the frequency dividing rate different from the reference frequency dividing rate is set, is set shorter than an operating time constant of the frequency dividing rate setting unit.