Focus detection in a digital focus servo system
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United States of America Patent
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Nov 29, 2005
Issued Date -
N/A
app pub date -
Sep 10, 2001
filing date -
Jan 25, 2001
priority date (Note) -
Expired
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Abstract
A system for determining whether a focus servo system is in focus or out of focus (i.e. open) is disclosed. A sum signal can be compared with a threshold value. If the sum signal is below the threshold value, then a focus open condition (i.e., out-of-focus) can be indicated. In some embodiments, a focus open condition is indicated where the sum signal remains below the threshold value for a predetermined period of time.
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