Patent ID: 7394748

Claim:
An optical disk recording apparatus, which records information on a recordable optical disk employing a constant angular velocity recording method and includes a clock signal generator for generating a write reference clock signal used for obtaining recording timing in a data-recording operation on the optical disk, the clock signal generator comprising: a first comparator configured to compare phases and frequencies between a frequency-divided signal of a predetermined reference clock signal input from outside and a frequency-divided signal of the write reference clock signal, and to output a first error signal representing comparison results; a second comparator configured to compare phases and frequencies between a wobble signal recorded beforehand on the optical disk and the frequency-divided signal or the write reference clock signal, and to output a second error signal representing comparison results and a first frequency differential signal representing a frequency difference; a selection circuit configured to select any one of the first and second error signals output from the first and second comparators, respectively, and to exclusively output the signal selected; a control voltage generator configured to generate a control voltage from the signal output from the selection circuit, and to output the control voltage; a voltage control oscillator configured to generate and output the write reference clock signal having a frequency corresponding to the control voltage input from the control voltage generator; and a control circuit configured to control operations of the selection circuit according to the first frequency differential signal.