Safety shut-off protection system

Details Safety shut-off protection system Safety shut-off protection system

1989-03-06

1990-10-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214AL, 315158, H01J 3150

Patent

active

049609882

ABSTRACT:
A safety shut-off protection system is provided for a light responsive system such as video cameras, image intensifiers, thermal imagers, or the like. The light responsive system further includes several series-connected, normally-closed, light responsive photoelectric Darlington safety switches. These safety switches are located to receive light along with the light responsive systems. Light exceeding a threshold intensity impinging on any one of the Darlington safety switches causes such a switch to operate to deactivate the light sensitive system.

REFERENCES:
patent: 4755725 (1988-07-01), Kastendieck et al.
patent: 4853529 (1989-08-01), Meyers
patent: 4876444 (1989-10-01), Field

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