Apparatus for controlling the operation of a door movable in a d

Details Apparatus for controlling the operation of a door movable in a d Apparatus for controlling the operation of a door movable in a d

1998-06-25

2000-06-27

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340545, G08B 1319

Patent

active

060809817

ABSTRACT:
A door obstruction detector employs an optical device, such as a segmented Fresnel lens, and a PIR sensor attached to a moving door, so that the optical device causes an image of an object, in a detection zone, to move across a sensing region of the PIR sensor when the door moves. When the object is sensed in the detection zone, a drive signal is generated for controlling movement of the door. Thermistors can be used to compensate for variation in ambient temperature to adjust detection sensitivity.

REFERENCES:
patent: 4717821 (1988-01-01), Messiou
patent: 5137118 (1992-08-01), Iwata

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