Laser light transmitter and proximity detector

Details Laser light transmitter and proximity detector Laser light transmitter and proximity detector

1992-06-16

1995-06-13

Swarthout, Brent

Communications: electrical

Condition responsive indicating system

Specific condition

359708, G08B 1318

Patent

active

054247179

ABSTRACT:
A laser light emitting diode (1, 2) situated at a focal point of a specially shaped lens (3, 4) produces a very thin intense fan-shaped beam. One or two such laser light transmitters are used to radiate a fan-shaped beam which is intercepted by a person or object thereby scattering laser light, by diffuse reflection. A cylindrical lens (5) receives a reflected component and this is detected by sensors (6) which are connected to circuitry including a synchronous detector (12) and comparator network (13, 14). The synchronous detector (12) is driven by a square wave oscillator (8) which modulates the laser light.

REFERENCES:
patent: 4460066 (1984-07-01), Ohta
patent: 4820030 (1989-04-01), Griffin
patent: 4850663 (1989-07-01), Yamamoto et al.
patent: 4869580 (1989-09-01), Silverglate
patent: 4874063 (1989-10-01), Taylor
patent: 5025895 (1991-06-01), Leone et al.
Copy of European search report based on priority document, searched completed Oct. 1991.

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