Patent ID: 7009924

Claim:
An optical disk recording apparatus, comprising: a measuring circuit which measures a parameter of a time-base error of a pulse train, the measuring circuit comprising: a phase-locked loop including a phase comparator and a variable frequency oscillator, wherein the phase comparator compares phases of an inputted pulse train and a clock signal based on an oscillation output of the variable frequency oscillator to output a phase error signal, and wherein an oscillation frequency of the variable frequency oscillator is variably controlled in correspondence with the phase error signal so as to allow the clock signal to be synchronized with the pulse train; an absolute value circuit which determines absolute values of phase errors consecutively outputted from the phase comparator; and an average value circuit which determines an average value of the absolute values of the phase errors which are consecutively determined, or which determines a value corresponding to the average value, wherein the value determined by the average value circuit is outputted as a measured value of a parameter of a time-base error of the pulse train; a beam-power adjusting circuit which adjusts recording beam power of a laser beam; and a control circuit which controls such that test recording is effected with respect to an optical disk while consecutively varying the recording beam power of the laser beam prior to the recording of the optical disk, the test recording is reproduced after the test recording, a value of the parameter of the time-based error of the reproduced pulse train is measured by the measuring circuit, an appropriate value of the recording beam power of the laser beam during actual recording is determined on the basis of the measured value, and the recording beam power of the laser beam is set to the appropriate value so as to effect actual recording.