Optical disk drive unit
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United States of America Patent
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Feb 22, 2005
Grant Date -
N/A
app pub date -
Aug 13, 2001
filing date -
Aug 20, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical disk drive unit performing write power calibration which performs recording on a given test area of an optical disk by changing a write power and sets an optimum write power based on characteristic values obtained from reproduced signals from the given test area includes average calculation means for dividing the given test area into a plurality of areas, performing recording on the areas by changing the write power equally, and calculating averages of characteristic values obtained from reproduced signals from the areas, and optimum write power setting means for setting the optimum write power based on the averages of the characteristic values calculated by the average calculation means. Thereby, with the averages of the characteristic values obtained from the areas of the optical disk which areas are in angularly different positions, the effects of the periodic variation of the optical disk can be reduced and the optimum write power can be set with good accuracy.
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