Electric lamp and discharge devices: systems – Cathode ray tube circuits – Plural concentrating – accelerating – and/or de-accelerating...
Patent
1981-09-28
1985-02-05
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
044980280
ABSTRACT:
An ultra-short high-performance LoBi electron gun is disclosed for use in very short cathode ray tubes. The gun comprises lower end means having a cathode for developing an electron beam, at least one apertured plate grid electrode for forming the beam in conjunction with the cathode, and at least one apertured plate prefocusing electrode for developing a crossover in the beam in conjunction with the grid electrode. The gun also comprises a main focus lens means for receiving, focusing and accelerating the beam. The lens means includes cylindrical focusing electrode means for focusing a beam spot of minimum size on the screen. The spacing between the focusing electrode and the prefocusing electrode, and the relative difference in potential therebetween, is effective to develop a weak electrostatic field for forming a steeply expanding beam, while cylindrical accelerating electrode means provides for accelerating the beam. The ratio of the potentials on the accelerating electrode and the focusing electrode is greater than six to one for forming a relatively strong electrostatic field therebetween. The weak electrostatic field between the prefocusing electrode and the focusing electrode means is effective to produce the steeply expanding beam for optimum filling of the main focus lens means. The relatively strong electrostatic field between the focusing electrode means and the accelerating electrode means is effective to produce a finely focused electron beam notwithstanding the ultra-short length of the gun.
REFERENCES:
patent: 4178532 (1979-12-01), Fukuzawa et al.
patent: 4287450 (1981-09-01), Kawakami et al.
patent: 4318027 (1979-09-01), Hughes et al.
patent: 4383199 (1983-05-01), Washino et al.
Theoretical and Practical Aspects of Electron Gun Design for Color Picture Tubes, IEE Transactions on Consumer Electronics, vol. CE-21, No. 1, Feb. 1975, by I. M. Wilson.
A Novel High-Voltage Bipotential CRT Gun Design, by Hughes and H. Y. Chen, 0098-3063/79/0400-0185, IEEE 0098-3063/79/0400.
Blum Theodore M.
O'Connor Cornelius J.
Zenith Electronics Corporation
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