Asymmetric unipotential electron beam focusing lens

Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control

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313449, 315 15, H01J 2948

Patent

active

049947133

ABSTRACT:
An electron gun for a cathode ray tube includes a cathode for generating electrons; a charged element for receiving electrons from the cathode and for forming a beam crossover; and an asymmetrical unipotential-type focus lens for forming an image of the crossover at a distance from the gun, comprising a prefocus electrode arrangement for forming a prefocusing field and a main focus electrode arrangement for forming a main focusing field, the prefocus electrode arrangement being constructed, configured and adapted to be excited to cause the prefocusing field to be weaker than the main focusing field such that at low beam currents the effective focal plane of the focus lens is moved forwardly away from the cathode and beam spot size performance is thereby improved, and such that the beam exit diameter is increased for reduced space charge effects and thereby improved high beam current performance.

REFERENCES:
patent: 3987329 (1976-10-01), Yamazaki et al.
patent: 4052643 (1977-10-01), Yamazaki et al.
patent: 4528476 (1985-07-01), Alig
patent: 4701677 (1987-10-01), Ashizaki et al.

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