Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1976-12-17
1978-05-23
Wilbur, Maynard R.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 531, 313455, H01J 2958
Patent
active
040913112
ABSTRACT:
A modulatable, hollow beam electron gun assembly includes an electron-optical (E-O) column having a fixed diameter ring, dispenser type cathode assembly for providing a hollow electron beam through thermionic emission from a hollow cylindrical cathode element, first and second control grid assemblies, a first anode assembly and a second anode assembly, which in combination with a beam modulator assembly comprises an electrostatic coaxial lens assembly. The grid and anode assemblies provide control of the emitted beam current density. The beam modulator assembly includes an axial electrode positioned along the longitudinal axis of the second anode assembly and first and second hollow, anode modulator rings disposed within the second anode and circumscribing a different portion of the axial electrode, each modulator ring responsive to modulation signals presented to each at a substantially complementary magnitude and polarity to provide a hollow electron beam having an average diameter provided by an instantaneous outer diameter and inner diameter value, the ratio of which defines an aspect ratio of the beam.
REFERENCES:
patent: 2936396 (1960-05-01), Currie
patent: 2997615 (1961-08-01), Adler
patent: 3013179 (1961-12-01), Harris
Luther Holger Martin
Mendelsohn Charles
Blum T. M.
Chiantera Dominic J.
United Technologies Corporation
Wilbur Maynard R.
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