Flash protection controller

Details Flash protection controller Flash protection controller

1979-12-07

1981-08-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250225, G02F 101, H01J 4014

Patent

active

042824290

ABSTRACT:
A controller provides a high voltage to maintain an electro-optic shutter in a transparent condition until a flash of light which would be harmful to personnel is sensed by a phototransistor. The controller then shorts the shutter to ground to minimize light transmission to the user and maintains light transmission at the pre-flash level for a predetermined time to allow the flash to subside. A log converter and differential trigger circuit keep the controller from being triggered by other light flashes which are not dangerous.

REFERENCES:
patent: 3342540 (1967-09-01), Abegg et al.
patent: 3400270 (1968-09-01), Durig
patent: 3564261 (1971-02-01), Hadermann et al.
patent: 3737211 (1973-06-01), Cutchen et al.
patent: 4155122 (1979-05-01), Budmiger

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