Method of operating light curtain with deactivated zone control

Details Method of operating light curtain with deactivated zone control Method of operating light curtain with deactivated zone control

1992-12-22

1994-01-25

Messinger, Michael

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340556, G01V 904, G08B 1318

Patent

active

052818098

ABSTRACT:
A method of operation of a light curtain system for sensing the intrusion of objects into detection planes which define a protected zone. A group of light beams are strobed from one transmitter in a first direction across a zone to a receiver, and another group of light beams are strobed from another transmitter across the zone to another receiver. Light beams within each group which intersect a desired entry area are deactivated for penetration of a permitted object, and other beams in the groups are enabled to detect intrusion into the objects in portions of the zone which lie around the entry area.

REFERENCES:
patent: 4015122 (1977-03-01), Rubinstein
patent: 4249074 (1981-02-01), Zettler et al.
patent: 4571498 (1986-02-01), Hagan et al.
patent: 4645920 (1987-02-01), Carroll et al.
patent: 4818866 (1989-04-01), Weber
patent: 5015840 (1991-05-01), Blau
patent: 5107253 (1992-04-01), Meadows

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