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US 4,423,354 AGranted
Method and apparatus for controlling electrode voltage in electron beam tubes
AssigneeKCR Technology, Inc.
InventorThomas D. Kegelman
Life of this patent
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AssigneeKCR Technology, Inc.
InventorThomas D. Kegelman
Estimating the term…
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.
A method of controlling the voltage on an electrode in an electronic tube device of the electron beam type comprising the steps of:
In an electronic tube device of the electron beam type having an electrode to be controlled located in said tube for bombardment by an electron beam, the improvement comprising:
A method of controlling the voltage on the conductive pins of a cathode ray pin tube including an array of said pins extending along a faceplate of said tube and selectively scanned by an electron beam comprising the steps of:
In a cathode ray pin tube comprising an array of conductive pins extending along a faceplate of said tube for selective scanning by an electron beam, means for controlling the voltage on said pins comprising:
Dependencies are inferred from the claim text.