Cathode-ray tube with magnetic ring

Details Cathode-ray tube with magnetic ring Cathode-ray tube with magnetic ring

1982-05-21

1986-05-27

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313413, 313414, H01J 2956, H01J 2976

Patent

active

045917558

ABSTRACT:
A cathode-ray tube 10 with a deflection system 15 and an electron gun 14 having a magnetic ring 19 attached thereto is designed so that the magnetic ring 19 is not covered by the deflection system 15. To achieve this, the magnetic ring 19 is placed further to the back of the color-picture tube 10 than in conventional tubes, and/or the deflection system 15 is made shorter at the back. On an adjusting apparatus comprising both a magnetizing device and a deflection-system-positioning device, the magnetization of the magnetic ring and the positioning of the deflection system of such a tube 10 can be performed simultaneously and independent of each other. The measure can be taken on all tubes having a deflection system 15 and a magnetic ring 19 for adjusting the positions of at least two electron beams; in the case of color-picture tubes, color purity and static convergence are adjusted with such a ring.

REFERENCES:
patent: 3992578 (1976-11-01), Igarashi
patent: 4370593 (1983-01-01), Sweigart et al.
patent: 4377767 (1983-03-01), Kornaker

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