Focusing method for optical media
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United States of America Patent
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Sep 22, 1998
Grant Date -
N/A
app pub date -
May 23, 1997
filing date -
May 24, 1996
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method for focusing the objective of an optical pick-up head on the desired information layer of an optical memory device. The focus error signal when the focus servo is in open loop mode is used to determine the location of the information layers (or layer) and to provide a mechanism for providing a signal which can be used to time/trigger the closing of the focus servo, thus providing focus on the desired layer. One example of an embodiment of the invention is an application to a dual layer optical disc.
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