Optical switching device employing a frequency synchronous circu

Details Optical switching device employing a frequency synchronous circu Optical switching device employing a frequency synchronous circu

1988-07-01

1990-11-27

Scott, Jr., Leon

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, G01V 904

Patent

active

049738348

ABSTRACT:
Optical switching device for sensing an object. The optical switching device includes an oscillator, an light-emitting circuit for emitting a light pulse train corresponding to a pulse train from the oscillator to the object, a light-receiving circuit for converting the light pulse train depending on the presence of the object into an electrical detection pulse train, a synchronous circuit for synchronizing the frequency of the detection pulse train with an adjustable frequency to provide a certain logic signal in synchronism, and a switching circuit for generating object detection logic signals in response to the logic signal from the synchronous circuit.

REFERENCES:
patent: 4442349 (1984-04-01), Blom et al.
patent: 4797547 (1989-01-01), Blanc et al.

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