Method for preventing an optical recording device from erroneous defect detecting during writing
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United States of America Patent
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Oct 10, 2006
Grant Date -
Mar 25, 2004
app pub date -
Sep 19, 2003
filing date -
Sep 20, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method of detecting defects during a write operation for an optical disk recording device, during a period of time immediately after writing begins, a sub-beam added (SBAD) signal is compared with a reference signal having a second threshold frequency. A defect is identified when a difference between the SBAD signal and the reference signal exceeds either a second upper limit or a second lower limit. Then, after the short period of time has elapsed, a SBAD signal is compared with and a reference signal having a first threshold frequency that is less than the second threshold frequency. A defect is identified when a difference between the SBAD signal and the reference signal exceeds either a first upper limit that is less than the second upper limit, or a first lower limit that is greater than the second lower limit.
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