Patent ID: 7961582
Filing Date: 2011-06-14
Classification: G11B

Abstract:
1. An optical disk recording apparatus capable of recording information by radiation of a modulated laser beam on an optical disk, comprising: a recording signal generating means for generating and outputting at least two laser light emission control signals for modulating the laser beam; a variable delay means, corresponding to each of said at least two laser light emission control signals, to output delay time corrected laser light emission control signals after individually changing a delay time of said each laser light emission control signal; a delay time control means for detecting a time lag between at least two of said delay time corrected laser light emission control signals, outputting said detected time lag, and controlling the delay time of the variable delay means in accordance with said outputting time lag; a laser diode light emission control means for controlling timing of emission of laser light based on said at least two delay time corrected laser light emission control signals; and a mode control means for switching between at least a normal operation mode for normal laser light emission for optical disc recording and playing and a timing a correction mode, wherein the delay time control means controls the delay time of the variable delay means by detecting a timing shift detection result; wherein in the timing shift correction mode, the recording signal generating means outputs timing shift detection signals from at least two signal output terminals to output said each laser light emission control signal, said timing shift detection signals changing their levels at substantially the same time; wherein the delay time control means detects a timing shift between the timing shift detection signals controls and sets the delay time of the variable delay means to reduce the timing shift; wherein a set value of the variable delay means is changeable in the timing shift correction mode and the set value of the variable delay means is not changeable in other modes different from the timing shift correction mode; and wherein a laser light emission amount is set to zero when the set value of the variable delay means is changed.