Color cathode ray tube with electron gun providing reduced conve

Details Color cathode ray tube with electron gun providing reduced conve Color cathode ray tube with electron gun providing reduced conve

1988-02-22

1989-09-19

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, H01J 2954, H01J 2962

Patent

active

048684546

ABSTRACT:
A color cathode ray tube having an in-line electron gun in which convergence drift is reduced significantly by providing conductive islands (32,34) in the form of metal mirrors on the internal wall of the neck. The islands (32,34) are located on and about the plane of the electron beams and face only the higher voltage one of the main focusing electrodes (g3,g4). The islands (32,34) float electrically. Additionally convergence stability can be improved by providing a ring or strip (36) about the external surface of the neck in the vicinity of the gap between the focusing electrodes (93,94), which ring or strip (36) is connected to a point of fixed potential such as ground.

REFERENCES:
patent: 4564786 (1986-01-01), Baum et al.
"Soft-Flash Picture Tubes", by J. Gerritsen, IEEE Transactions on Consumer Electronics, vol. CE-24, No. 4, Nov. 1978.

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