Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1987-12-02
1989-06-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
315241P, H01J 3150, H01J 4014
Patent
active
048432296
ABSTRACT:
There is disclosed a high light level cutoff apparatus for use with night vision devices. The apparatus employs a digital method of timing implemented by a divider counter responsive to a crystal controlled input frequency which essentially controls a latch to produce an automatic shutoff of a night vision device during high light ambient conditions which conditions would undesirably reduce the effective life of such a night vision device. The circuitry disclosed utilizes a digital method of clocking and employs the latching relay as indicated which is operated by the digital counter. The circuitry provides a feed back from the latching relay which resets the night vision system so that it will re-operate if a transient accidentally serves to operate the goggles while the light level is in a high state. The circuitry provides a precise timing level via the counter which can be selected to provide extended time out periods from milliseconds to at least several minutes, circumventing many of the disadvantages of prior art devices.
REFERENCES:
patent: 4398127 (1983-08-01), Bahn et al.
patent: 4755725 (1988-07-01), Kastendieck et al.
Caserta Joseph N.
Reed Joseph
ITT Electro Optical Products, A Division of ITT Corporation
Nelms David C.
Oen William L.
Twomey Thomas N.
Werner Mary C.
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