Electron gun having cylindrical focus lens

Details Electron gun having cylindrical focus lens Electron gun having cylindrical focus lens

1985-08-06

1987-01-06

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313449, 313457, H01J 2962, H01J 2950, H01J 2982

Patent

active

046349243

ABSTRACT:
An inline electron gun for generating and directing three electron beams, a center beam and two side beams, along initially coplanar paths includes an electrostatic main focusing lens for focusing the electron beams. The main focusing lens is formed by two spaced electrodes, each having three separate inline apertures therein. A first of the main focusing lens electrodes includes a first cylindrical portion having a diameter larger than the sum of the diameters of the apertures therein. A second of the main focusing lens electrodes includes a second cylindrical portion having a diameter larger than the diameter of the first cylindrical portion of the first main focusing lens electrode. At least part of the first cylindrical portion of the first main focusing lens electrode is located within the second cylindrical portion of the second main focusing lens electrode. The largest component of the main focusing lens is established by the first and second cylindrical portions. Secondary components of the main focusing lens are established by adjacent apertures in the first and second main focusing lens electrodes.

REFERENCES:
patent: 2921228 (1960-01-01), Farnsworth
patent: 3873879 (1975-03-01), Hughes
patent: 4178532 (1979-12-01), Fukuzawa et al.
patent: 4271374 (1981-06-01), Kimura
patent: 4368403 (1983-01-01), Lewis
patent: 4370592 (1983-01-01), Hughes et al.

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