Electron gun having an astigmatic beam forming region

Details Electron gun having an astigmatic beam forming region Electron gun having an astigmatic beam forming region

H - Electricity

01

J

313/35.261

H01J 29/48 (2006.01) H01J 29/50 (2006.01) H01J 29/70 (2006.01)

Patent

CA 1201753

Abstract of The Disclosure A cathode-ray tube has an electron gun for use with an astigmatic magnetic deflection yoke, which comprises at least one cathode for generating at least one electron beam along a beam path toward a screen of the tube. The electron gun includes a beam forming portion proximate to the cathode and a main lens portion remote therefrom. The beam forming portion comprises a plurality of electrodes, one of which is an astigmatic beam forming electrode which introduces a compensating asymmetry into the electron beam. The astigmatic beam forming electrode has a functional grid portion of a given thickness with at least one aperture formed therethrough. The aperture is intersected by a slot formed in the functional grid portion. The slot, which has a depth less than the thickness of the functional grid portion, extends across oppositely disposed quadrants of the aperture.

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