CRT lensing electrodes having apertures defined by tapered sidew

Details CRT lensing electrodes having apertures defined by tapered sidew CRT lensing electrodes having apertures defined by tapered sidew

1983-02-04

1985-09-17

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

H01J 2962

Patent

active

045423180

ABSTRACT:
The invention pertains to the achievement of improved lensing means employed in compact plural beam in-line CRT electron gun assemblies resulting in small round spot sizes on the screen. Such is effected by forming cooperating tapered apertures in a low potential lensing electrode and similar facing apertures in an adjacent high potential lensing electrode. The larger openings of the two sets of facing tapered apertures provide lenses of larger than normal dimensions. Additionally, partial overlapping of the apertures permits even larger lenses in the available electrode areas, thereby effecting further improved lensing of the beams.

REFERENCES:
patent: 4275332 (1981-06-01), Ashizaki et al.
patent: 4358703 (1982-11-01), Bijma et al.
patent: 4412149 (1983-10-01), Say

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