Electric circuit arrangements incorporating cathode ray tubes

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

H - Electricity

01

J

355/10, 313/35.3

H01J 29/62 (2006.01) H01J 29/48 (2006.01)

Patent

CA 1061007

Abstract of the Disclosure 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 elec- trons therebetween and the second anode is supplied with such a lower positive potential than at the adjacent first and third anodes that 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. - 1 -

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