Focus control system
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United States of America Patent
Stats
-
Nov 27, 1990
Grant Date -
N/A
app pub date -
Jun 9, 1989
filing date -
Jun 9, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system for focussing a lens on a point light source is provided that includes an opaque member disposed near the lens. The member cast a shadow having a distinguishable orientation in the image of the light source. An image processing device determines the focus condition and range to the point light source from the orientation and size of the shadow.
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Family
International Classification(s)
Cited Art Landscape
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