Electric lamp and discharge devices: systems – Cathode ray tube circuits – Plural concentrating – accelerating – and/or de-accelerating...
Patent
1981-02-06
1983-06-14
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Plural concentrating, accelerating, and/or de-accelerating...
313389, H01J 2946, H01J 2956
Patent
active
043885560
ABSTRACT:
Disclosed is an electron gun comprising a cathode, a first apertured anode spaced from said cathode and operated at a potential of between 5 and 30 volts positive with respect to the cathode. The gun further comprises a second apertured anode spaced from the first anode and operating at a potential of between 100 and 400 volts positive with respect to the cathode to produce a lens field in the region between the anodes which focusses the electrons emitted from the cathode at a cross-over therebetween. The cross-section of the beam produced by the gun is determined by the size of the aperture in the second anode and the beam current may be varied by changing the voltage on the first anode to thereby move the cross-over closer to or further away from the second anode so that a larger or smaller portion, respectively, of the electrons in the beam passes through the aperture.
REFERENCES:
patent: 3040205 (1962-06-01), Walker
patent: 3548250 (1970-12-01), Van Roosmalen et al.
patent: 3732457 (1973-05-01), Ueno et al.
patent: 3894261 (1975-07-01), Corson
patent: 3919586 (1975-11-01), Holman
patent: 4169239 (1979-09-01), Ehata et al.
Blum Theodore M.
Schechter Marc D.
U.S. Philips Corporation
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