Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1987-12-08
1989-06-13
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
250213VT, 313532, 358219, H01J 2952
Patent
active
048395692
ABSTRACT:
A photocathode current sensing circuit (58) is provided to adjust the electron accelerating voltage to a cone (32) and a phosphor screen (34) on an image intensifier tube (26). The voltage is adjusted by an anode power supply (60) which is responsive to the photocathode current sensing circuit (58). As light strikes the photocathode (28), a current (56) is generated. The current (56) is directly proportional to the intensity of light striking the photocathode (28). As the light and the current (56) decrease, the sensing circuit (58) controls the power supply (60) to provide a higher voltage to the cone (32) and the screen (34). By increasing the voltage to the cone (32) and the screen (34) the electrons are provided with more acceleration and, therefore, are intensified for viewing on the screen (34). An increase in light operates oppositely and decreases the intensity on the screen (34).
REFERENCES:
patent: 3612762 (1971-10-01), Wuellner et al.
patent: 4025955 (1977-05-01), Grallien et al.
patent: 4710675 (1987-12-01), Stephenson
Blum Theodore M.
Varo Inc.
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