Automatic reticle brightness control circuit means in night visi

Details Automatic reticle brightness control circuit means in night visi Automatic reticle brightness control circuit means in night visi

1976-09-09

1977-11-01

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250205, 315 10, 315158, H01J 3150, G01J 132

Patent

active

040567214

ABSTRACT:
A reticle brightness control circuit means in a night vision image intenser in which the circuit means utilizes screen current intensity to provide a proportionate amount of current through a reticle light-emitting diode (LED) for controlling the brightness level therefrom as projected on the cathode. When the object image input brightness impinging on the cathode is less than an automatic brightness control limiting level, the screen current limiting level and the reticle LED brightness are directly controlled by the screen current. However, when the object image input brightness goes about the screen current limiting level, the brightness level of the reticle LED is further increased by a decreased feedback voltage from the microchannel plate power supply oscillator (MCP OSC) circuit which provides proportionately more current through the reticle LED wherein the brightness of the reticle image remains commensurate with the input image brightness under all input light levels.

REFERENCES:
patent: 3666957 (1972-05-01), Wyess
patent: 3816744 (1974-06-01), Chow
patent: 3872302 (1975-03-01), Fender

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