Electric lamp and discharge devices: systems – Cathode ray tube circuits – With secondary emission stage in the cathode-ray tube
Patent
1980-12-24
1983-12-27
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
With secondary emission stage in the cathode-ray tube
346158, 315374, H01J 2941
Patent
active
044233540
ABSTRACT:
A controlling electrode is positioned in physical proximity to one or more electrodes in an electron beam tube so that the controlling and controlled electrodes are subject to common electron bombardment. A control voltage of preselected magnitude and polarity is applied to the controlling electrode. During the common electron bombardment, primary and secondary electrons are present in the region of the electrodes, an exchange of electrons occurs between the electrodes, and the voltage on the controlled electrodes switches to a value at or near the voltage applied to the controlling electrode. The electron beam tube can be a cathode ray pin tube used in electrostatic printing in which case a single controlling electrode is positioned in proximity to the array of conductive pins in the tube face plate. The voltage applied to the controlling electrode is made more negative than the potential of an unscanned pin and the maximum negative voltage of the pins is controlled to improve the ultimate quality of electrostatic printing provided by the tube. A tube face plate comprises two segments which cooperate to define a V-shaped groove facing the beam, which positions portions of the pins at an angle to the beam, and one of the segments receives the controlling electrode in a manner establishing the spacing of the electrode from the pins.
REFERENCES:
patent: 3040124 (1962-06-01), Camras
patent: 3663748 (1972-05-01), Boon
Blum Theodore M.
KCR Technology, Inc.
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