Picture display device with quadrupole lenses

Details Picture display device with quadrupole lenses Picture display device with quadrupole lenses

1982-01-25

1984-08-28

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313431, 313442, H01J 2956, H01J 2964

Patent

active

044685874

ABSTRACT:
In a device for displaying pictures with a display tube and a self-converging system of deflection coils, the focusing in the direction in which the focusing is substantially independent of the deflection by the system of the deflection coils is effected by means of two quadrupole lenses and in the direction at right angles thereto by the focusing lens. This makes it possible to use dynamic focusing in said latter direction without defocusing in another direction and to obtain a sharp spot all over the screen. By providing an octupole lens coaxially around the electron beam and the center of the focusing lens it also becomes possible to reduce the spherical aberration.

REFERENCES:
patent: 3946266 (1976-03-01), Saito et al.
patent: 4310776 (1982-01-01), Duys

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