Document Type and Number:
Japanese Patent JPS6330680
Kind Code:
B2
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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Inventors:
TSUTSUMI SUTEO
KO HIROSHI
KO HIROSHI
Application Number:
JP1099781A
Publication Date:
June 20, 1988
Filing Date:
January 27, 1981
Export Citation:
Assignee:
FUJITEC KK
International Classes:
G08B17/12; B66B5/00; G01N21/84; G01N21/88; G01V8/12; G01V8/14; G08B13/18; G08B13/193; G08B19/00; G08B21/00; G08B21/22; G08B23/00; G08B25/04