Importance

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Abstract

If adequate setup time or hold time cannot be provided between a recording clock signal and modulated signal during the use of a laser control integrated circuit for generating a recording strategy from the recording clock signal and modulated signal to drive a laser diode, the disk recording information becomes erroneous. To solve this problem, the present invention provides the laser control integrated circuit input stage for the recording clock signal and modulated signal with variable delay devices that can vary the phases of these signals. The variable delay devices control the delay amounts of the variable delay devices in accordance with disk recording information error and optimize the phase relationship between the recording clock signal and modulated signal. Further, the present invention not only provides means for directly detecting disk recording information error in accordance with the relative phase difference between the recording clock signal and modulated signal entered in the laser control integrated circuit or between the internal clock signal and modulated signal generated by the laser control integrated circuit, but also provides means for optimizing the phase relationship between the recording clock signal and modulated signal in accordance with the output from the above detection means.

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First Claim