Monitoring system for a predetermined field of view
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United States of America Patent
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Nov 19, 1985
Grant Date -
N/A
app pub date -
Dec 15, 1981
filing date -
Jan 27, 1981
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A lift control system includes a spatial filter for producing a signal having various features, a discriminator for discriminating one or more features of the signal, and for producing a control signal when at least one of the features discriminated falls in a predetermined range, and active devices connected to the discriminator. The spatial filter is defined by a semi-spherical bowl having a plurality of openings or by a poly-face prism which is made from a plano-convex lens with its curved face so polished or cut as to have a plurality of flat faces.
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