Patent ID: 6080981
Filing Date: 2000-06-27
Classification: E05F,E05Y,G01V,G07C

Abstract:
Apparatus for controlling the operation of a door movable in a door opening, a detection zone being present adjacent said door opening, said door operation being controlled so as to prevent contact between said door and an obstruction in said door opening, the apparatus comprising:a sensing device attached to said movable door for thermally sensing said object in said detection zone, said sensing device including at least one passive infrared PIR sensor having a sensing region, and an optical device for producing an image on said sensing region, whereby when said door moves in said door opening, said optical device causes said image to move across said sensing region of said PIR sensor, thereby enabling said sensing device to sense said object and to generate a drive signal; and circuitry response to said drive signal for controlling the movement of said door to prevent contact between said door and said obstruction.