Light guide implementation of a proximity detector

Details Light guide implementation of a proximity detector Light guide implementation of a proximity detector

1997-10-24

2000-07-11

Ham, Seungsook

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25022724, 356 401, 385 31, G01J 104, G02B 626

Patent

active

060876530

ABSTRACT:
A proximity detector structure comprising a pair of light guides which are optically isolated from each other, each of the light guides having an end surface at one end thereof, a light source for transmitting light along one of the light guides to its end surface, a light receiver for receiving light carried by another of the light guides, a light emitter at the end surface of the one of the light guides for emitting light carried by the one of the light guides, and a light gathering structure at the end surface of the other of the light guides for receiving light emitted from the light emitter and reflected from an external surface and for passing the received light into the other of the light guides, the light emitter and light gathering structure being shaped so as to couple unreflected light directly from the light emitter to the light gathering structure.

REFERENCES:
patent: 5224151 (1993-06-01), Bowen et al.
patent: 5771091 (1998-06-01), Paritsky et al.

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