Light curtain

Details Light curtain Light curtain

2005-03-29

2005-03-29

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C340S555000

Reexamination Certificate

active

06872932

ABSTRACT:
Light curtain comprising two long assemblies defining between them an area to be monitored.Each assembly P1, P2comprises with regard to the other assembly a striped surface of light13and dark areas12thus forming a grid. A linear or matrix receiver having a suitable optic picks up the image from the grid and the processing means of the two assemblies process the corresponding image signals to send an intrusion signal. Each assembly should preferably have two receivers RH1, RB1; RH2, RB2near its ends and the optic associated to each receiver should cover the whole length of the opposite assembly, and the processing means should carry out a redundant processing of the images of the monitored area.

REFERENCES:
patent: 5130532 (1992-07-01), Clemens
patent: 5266810 (1993-11-01), Murphy
patent: 1 261 025 (1968-02-01), None
patent: 1 561 424 (1980-02-01), None

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