Electric circuit arrangements incorporating cathode ray tubes

Details Electric circuit arrangements incorporating cathode ray tubes Electric circuit arrangements incorporating cathode ray tubes

1976-11-09

1981-09-01

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

313449, H01J 2946, H01J 2956

Patent

active

042874505

ABSTRACT:
An electron gun assembly of a cathode ray tube comprises in the order named, a cathode, an apertured modulator electrode, a first and a second apertured anode and a third cylindrical focussing anode. The modulator electrode and the first anode are supplied with such potentials as to form a crossover of electrons therebetween and the second anode is supplied with such a lower positive potential than at the adjacent first and third anodes that the electron stream emitted from the cathode is formed into a narrow beam of electrons and is allowed to enter the third anode at a small angle of beam spread and comes to a focus on the screen of the tube by the third anode to produce a spot of small cross-sectional area.

REFERENCES:
patent: 2825837 (1958-03-01), Dudley
patent: 2935636 (1960-05-01), Knechtli
patent: 3417199 (1968-12-01), Yoshida et al.
patent: 3995194 (1976-11-01), Blacker, Jr. et al.

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