Light barrier with retroreflector and optical means

Details Light barrier with retroreflector and optical means Light barrier with retroreflector and optical means

1991-09-20

1993-01-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 340556, G01V 904, G08B 1318

Patent

active

051809109

ABSTRACT:
A reflected light barrier is provided which includes a light source and a transmitting lens located for transmitting light from the light source along a beam path having a transmitting axis. A retroreflector is positioned for receiving the light transmitted by the transmitting lens and retroreflects the transmitted light. A light detector is disposed on the same side of the retroreflector as the light source. A receiving lens having a receiving optical axis is disposed in front of the light receiver for collecting a portion of the retroreflected light and focusing the portion of retroreflected light onto the light detector. The transmitting lens and the receiving lens are arranged next to one another. An optical device is disposed along the beam path between the transmitting lens and the receiving lens for transmitting and redirecting the transmitted and retroreflected light so that an increased portion of retroreflected light is oriented onto the receiving optical axis of the receiving lens.

REFERENCES:
patent: 3842257 (1974-10-01), Kohler
patent: 4155647 (1979-05-01), Michel
patent: 4339660 (1982-07-01), Buchholz et al.
patent: 4458979 (1984-07-01), Ross
patent: 4546246 (1985-10-01), Bechtel
patent: 4563577 (1986-01-01), Schaller
patent: 4816667 (1989-03-01), Meinert
patent: 4847488 (1989-07-01), Muller et al.
patent: 4958068 (1990-09-01), Pong et al.
patent: 5004908 (1991-04-01), Nakamura

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