Cathode ray tube having an electron gun with bipotential focusin

Details Cathode ray tube having an electron gun with bipotential focusin Cathode ray tube having an electron gun with bipotential focusin

1987-04-17

1989-02-21

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313481, H01J 2962, H01J 2994

Patent

active

048068217

ABSTRACT:
A cathode ray tube having an electron gun with a triode section and bi-potential focusing lens electrodes. Generally such focusing lens electrodes comprise two juxtaposed cylindrical electrodes of which the one nearer the screen (accelerating electrode) is at the screen voltage of approximately 30 kV. If it is desired to increase the diameter of the focusing lens the voltage difference between the focusing electrode and the other cylindrical electrode (accelerating electrode) must be increased. The effect of this is to make the focusing electrode voltage unacceptably low with respect to the triode section. This problem is overcome by providing the accelerating electrode 29 with a diaphragm 30 having an aperture whose area is less than half the cross-sectional area of the focusing electrode (24). The presence of the diaphragm enables the focusing electrode voltage to be increased to an acceptable level and be equal to that applied to a prefocusing lens electrode (22), enabling these electrodes (22, 24) to be interconnected electrically and/or mechanically.

REFERENCES:
patent: 3183391 (1965-05-01), Benway
patent: 4481445 (1984-11-01), Gorski
patent: 4498028 (1985-02-01), Gorski
patent: 4607187 (1986-08-01), Villanyi
patent: 4665340 (1987-05-01), Odenthal et al.

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