Beam type safety device

Details Beam type safety device Beam type safety device

1984-01-24

1986-01-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502221, G01V 904

Patent

active

045635781

ABSTRACT:
A beam type safety device having a plurality of light emitting elements and a plurality of light receiving elements associated with the light emitting elements wherein the light emission operation of the light emitting elements and the light receiving operation of the light receiving elements are sequentially scanned and the interception of any of the light beams from the light emitting elements to said light receiving elements is detected based on the outputs of the light receiving elements, comprises a first memory for storing the outputs of the light receiving elements, the data thus stored being cleared before the scan of the relevant light receiving elements and a second memory for storing the outputs of the first memory after the scan of the relevant light receiving element to provide the light interception detection output.

REFERENCES:
patent: 3764813 (1973-10-01), Clement et al.
patent: 3970846 (1976-07-01), Schofield et al.
patent: 4384201 (1983-05-01), Carroll et al.

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