Optimum reproduction laser power based on amplitude level of information signal
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United States of America Patent
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Dec 25, 2001
Grant Date -
N/A
app pub date -
Nov 2, 1998
filing date -
Nov 4, 1997
priority date (Note) -
Expired
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Abstract
An optical information reproducing apparatus and an optical information reproducing method are capable of restraining the variation of laser power by always detecting a constant amplitude of RF signal, even if there is a irregularity of asymmetry. In the optical information reproducing apparatus for reproducing an information signal recorded on a disk (8) by irradiating thereon a laser light modulated by an information signal, during reproduction, the control amount (S4) of the power control circuit 11 for controlling the power of the laser light to an optimum value is made the value based on the amplitude level VP-, VP+ of the reproduced information signal.
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