Reflection light barrier employing adjacent lenses having border

Details Reflection light barrier employing adjacent lenses having border Reflection light barrier employing adjacent lenses having border

1988-03-02

1989-03-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, 340557, G01V 904

Patent

active

048166677

ABSTRACT:
A reflection light barrier has a light transmitter/receiver (14) having two adjacent front lenses (18, 19) for the transmitted and received light respectively. A triple reflector (13') is arranged at the end of the light barrier path and consists of a plurality of individual triples. In accordance with the invention the length of the boundary line (12) between the pupils is curved so that on arranging the triple reflector (13, 13') in the near range of the light transmitter/receiver the quantity of light which enters into the receiver pupil (16) as a result of the triple displacement (V) corresponds essentially to the quantity of light received when the triple reflector (13) is arranged in the far region.

REFERENCES:
patent: 4224608 (1980-09-01), Lederer
patent: 4310836 (1982-01-01), Stanzani
patent: 4339660 (1982-07-01), Buchholz et al.
patent: 4546246 (1985-10-01), Bechtel

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