Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Patent
1996-03-29
1998-02-17
Tran, Thang V.
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
G11B 2736
Patent
active
057198381
ABSTRACT:
A method and apparatus used in compensating for birefringence effects in measuring recording data quality on optical discs, .beta., in an optical disc reader/recorder comprising performing a power series of writes on the optical disc within the optical disc reader/recorder, wherein each member of the series has a merit parameter, .beta. value, identified and placed in a table versus recording parameters; identifying at least one particular track having an ideal merit parameters as compared to a predetermined value; using defocused optics to read the series of writes contained within the at least one particular track to generate a rate of change for .beta. vs. defocus setting for the particular track; determining a .beta. compensation value for the rate of change; and applying the .beta. compensation in conjunction with the table to select appropriate recording parameters.
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Eastman Kodak Company
Leimbach James D.
Tran Thang V.
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