Patent ID: 7570564

Claim:
An optical disk apparatus for recording information by forming marks and spaces on an optical disk, comprising: a laser diode for irradiating laser beam on said optical disk; a laser diode driver for driving said laser diode; a controller for controlling said laser diode, wherein said controller controls such that said laser diode driver supplies a high-frequency-superimposing drive current to said laser diode during a space-forming time period, and controls such that said supply is stopped prior to a predetermined duration which is higher than 0 for a timing of changing from said space-forming-time period to an adjacent mark-forming time period, the optical disk apparatus further comprising: a high-frequency component generation block, including both a multiply unit and a duty control unit, for outputting the high-frequency-superimposing drive current, the multiply unit being arranged to multiply a recording reference clock to generate a high-frequency component, the duty control unit being arranged to vary a duty of an output signal of the multiply unit.