Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1991-08-30
1993-10-05
Demeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313449, H01J 2950, H01J 2962
Patent
active
052508757
ABSTRACT:
An electron gun for a cathode ray tube arranged in sequence following by a cathode, a first grid electrode, a second grid electrode, a first accelerating/focusing electrode, and a second accelerating/focusing electrode from the lower on the axis of the cathoderay tube, comprises a third grid electrode assembly including an inter-grid assembly installed between the lower electrode and the upper electrode which is made into the first accelerating/focusing electrode, a main electrostatic focusing lens mounted between the fourth grid electrode to be considered as the second accelerating/focusing electrode and the upper electrode of the third grid electrode assembly and other electrostatic focusing lens formed between the inter-grid assemblies which is installed in the third grid electrode assembly, in which the drift space of the electron beam is secured in the electron gun and the focusing electrode of the main electrostatic focusing electrode, which is applied to a lower voltage, is devided into two to get the inter-grid assembly made of ceramics to be integrally installed therebetween, so that the focusing performance of the electron beam enables the multi-focusing effect to be obtained, and the configuration of one focusing electrode in the outer form is contributed to the assembly and accuracy.
REFERENCES:
patent: 4833365 (1989-05-01), Shirai et al.
patent: 4866335 (1989-09-01), Cho
patent: 5081393 (1992-01-01), Kinami
DeMeo Palmer C.
Goldstar Co. Ltd.
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