Improvements relating to electron discharge devices

900,351. Cathode-ray tubes. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Oct. 12, 1960 [Oct. 23, 1959], No. 36024/59. Class 39 (1). An electron discharge device comprises an electron gun 1, a target 9, scanning means 3, 4, and parallel, apertured-plate electrodes 5, 7 forming with the target an electron le...

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Bibliographic Details
Main Author HAINE MICHAEL EDWARD
Format Patent
LanguageEnglish
Published 04.07.1962
Subjects
BASIC ELECTRIC ELEMENTS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
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Summary:900,351. Cathode-ray tubes. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Oct. 12, 1960 [Oct. 23, 1959], No. 36024/59. Class 39 (1). An electron discharge device comprises an electron gun 1, a target 9, scanning means 3, 4, and parallel, apertured-plate electrodes 5, 7 forming with the target an electron lens. The positions of the electrodes relative to the target and the potentials applied to the electrodes and target are such that the principal focus of the lens is located at the effective centre of deflection of the beam, whereby the beam impinges normally on the target, and the beam is focused on the target. Preferably, electrode 7 is at a potential intermediate those of electrode 5, e.g. 500 volts, and target 9, e.g. ground or cathode potential, so that the beam impinges on the target with a low velocity. The target may comprise a photo-conductive or photo-emissive material.
Bibliography:Application Number: GB19590036024