Method for recording and reproducing information by pre-pits detection
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United States of America Patent
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Sep 25, 2001
Issued Date -
N/A
app pub date -
Sep 11, 2000
filing date -
Jun 20, 1997
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Abstract
A beam is irradiated to an information recording medium having land tracks and groove tracks alternately formed on a track formed in turn on an information recording surface thereof and pre-pits so pre-formatted as to deviate from the center of the track, a return beam of the irradiated beam is received by detectors split into two parts in a track direction to obtain a differential signal, the pre-pit is detected from this differential signal and control of recording and reproducing processings is executed by using the pre-pit detection signal so obtained as the reference.
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