Cathode ray tube

Details Cathode ray tube Cathode ray tube

1991-12-31

1993-10-19

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313414, H01J 2948

Patent

active

052549038

ABSTRACT:
A cathode ray tube includes a plurality of electrode layers which are separately formed in the advancing direction of electron beam, and form a plurality of electrostatic lenses along with corresponding electrodes of an electron gun upon applying voltages of differing potentials. The cathode ray tube has an accelerating electrode layer as an accelerating electrode which forms a main lens with a focusing electrode of the electron gun, and an electrode layer as a prefocusing electrode which forms a prefocusing lens with the focusing electrode and other electrodes, so that the electron beam is accelerated and focused by the electrode layer formed on the inner surface of a neck. The image quality realized on the screen can be improved, while reducing the length of the neck.

REFERENCES:
patent: 2726348 (1955-12-01), Benway
patent: 3327160 (1967-06-01), Schlesinger
patent: 4961022 (1990-10-01), Hellings et al.
patent: 4980606 (1990-12-01), Yamauchi et al.

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