Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1994-11-14
1996-12-10
Le, Que T.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25055945, 340556, 187316, G01V 904
Patent
active
055833349
ABSTRACT:
A light grid consists of a row (13) of adjacent light transmitters (11.sub.i) and adjacent light receivers (12.sub.i) arranged at a distance opposite to the latter. The light transmitters (11.sub.i) and the associated light receivers (12.sub.i) are individually activated cyclically one after the other. A determination is made at each light receiver (12.sub.i) whether a received light signal is present or not on activation of the associated light transmitter (11.sub.i). By considering, during the evaluation, the light receivers (12.sub.i-1, 12.sub.i+1) adjacent to the associated light receiver (12.sub.i) and the light transmitters (11.sub.i+1, 11.sub.i-1) adjacent to the associated light transmitter (11.sub.i), a differentiation is made between an obstacle introduced into the protective field (26) and a defect light transmitter (11.sub.i) and/or light receiver (12.sub.i).
REFERENCES:
patent: Re33668 (1991-08-01), Gray
patent: 4654920 (1987-02-01), Carroll
patent: 5149921 (1992-09-01), Picado
patent: 5225691 (1993-07-01), Powers et al.
patent: 5319216 (1994-06-01), Mokuo et al.
Erwin Sick GmbH - Optik-Elektronik
Le Que T.
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