Cathode ray tube having a tubular focus structure

Details Cathode ray tube having a tubular focus structure Cathode ray tube having a tubular focus structure

1989-01-23

1990-07-31

Wieder, Kenneth

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313451, 313456, H01J 2902, H01J 2962

Patent

active

049452835

ABSTRACT:
Cathode ray tube having an electron gun positioned in the neck portion, the gun comprising a beam-forming part and a focusing structure and the beam-forming part comprising at least a cathode and a metal electrode plate provided with a central aperture, and the focusing structure comprising a hollow tube of an electrically insulating material with inner and outer surfaces and with a layer of high-ohmic resistive material on at least one of the surfaces. The electrodes of the beam-forming part of the electron gun are secured via metal pins to rods for forming an assembly. The hollow tube is directly secured to the metal electrode plate for the purpose of correct alignment. The tube has a first and a second end face, the first end face in one embodiment having a metal plate with a coaxial aperture, and the said metal plate is fixedly connected to the metal electrode plate of the beam-shaping part of the electron gun in such a way that their apertures are coaxial.

REFERENCES:
patent: 3375390 (1968-03-01), Schlesinger
patent: 3950667 (1976-04-01), DeJong et al.
patent: 4857797 (1989-08-01), Vrijssen et al.

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