Display tube including a helical focusing lens with a non-rotati

Details Display tube including a helical focusing lens with a non-rotati Display tube including a helical focusing lens with a non-rotati

1989-04-24

1990-10-02

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313450, 313458, H01J 2962

Patent

active

049610228

ABSTRACT:
A display tube comprising an electron gun having a beam-shaping part and a focusing structure. The focusing structure comprises an elongate hollow structure with a high-ohmic resistive layer provided on the inner and/or outer surface and comprises means for forming a non-rotationally symmetrical lens element in the area of the focusing structure. This may be a structure generating an electric multipole (for example, dipole or quadrupole) which may be incorporated particularly in the high-ohmic resistive layer.

REFERENCES:
patent: 4211953 (1980-07-01), Rybalko
patent: 4857797 (1989-08-01), Vrijssen et al.

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