Colour display tube with reduced deflection defocussing

Details Colour display tube with reduced deflection defocussing Colour display tube with reduced deflection defocussing

H - Electricity

01

J

313/35.14

H01J 29/50 (2006.01)

Patent

CA 1275683

ABSTRACT: "Colour display tube with reduced deflection defocussing" Colour display tube comprising an electron gun 5 of the in-line type. The electron gun 5 comprises a main lens which is constituted by a first focussing electrode 25 and a second focussing electrode 26. The first focussing electrode comprises sub-electrodes 27, 28 placed at a distance from each other between which an auxiliary electrode constituting an astigmatic element GAST is positioned. The auxiliary electrode GAST is connected during operation to means for applying a constant voltage, whilst at least the sub-electrode 28 forming part of the main lens is connected during operation to means for applying a control voltage. The control voltage may be a static voltage or a dynamically varying voltage, for example, a parabolic voltage which is in synchronism with the line deflection.

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