Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-05-15
1989-05-02
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250227, G01D 534
Patent
active
048271241
ABSTRACT:
Opaque/translucent-transparent markings on a flat track pass through a gap defined by a carrier body sealed in a casing and having peripheral grooves ending at the gap of the body for embedding light conductors connected to light emitting and receiving means aranged generally on opposite sides of the gap.
REFERENCES:
patent: 4096383 (1978-06-01), Mancini
patent: 4236070 (1980-11-01), Lee
patent: 4240066 (1980-12-01), Lenox
patent: 4430566 (1984-02-01), Searle
patent: 4536649 (1985-08-01), Kozai et al.
Babsch Alfred
Beth Dieter
Panzer Werner
Stempfle Johann
Mannesmann AG
Siegemund Ralf H.
Westin Edward P.
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