Passive detection system for detecting a body near a door

Details Passive detection system for detecting a body near a door Passive detection system for detecting a body near a door

2006-05-16

2006-05-16

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C340S545300, C340S545100

Reexamination Certificate

active

07045764

ABSTRACT:
A detection system for detecting a body near a doorway includes two detectors having one or more activation lines that overlap each other. With certain mounting arrangements, the detectors cover areas within and on both sides of the doorway. The detectors are meant to help prevent an already open door from accidentally closing on the body. The door is powered by a drive unit that ignores the detectors when the door is closed.

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