Cathode-grid support structure for CRT electron gun

Details Cathode-grid support structure for CRT electron gun Cathode-grid support structure for CRT electron gun

1987-08-21

1989-08-01

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313447, 313457, H01J 2904, H01J 2950, H01J 2982

Patent

active

048535842

ABSTRACT:
An electron gun with an improved structure for providing accurately adjusted cut-off voltage. A novel process for producing the improved electron gun, and maintain substantially high uniformity of cut-off voltge in production. The electron gun comprises a plurality of grid electrodes including a first electrode mounted at the closest position to a cathode. The cathode is supported by a cathode base. The cathode base and the first electrode are provided in a pre-assembled form. The pre-assembly of the cathode base and the first electrode is supported by means of a holder which is fixed to glass beads together with other grid electrodes. In assembling of the electron gun, the distance between the cathode surface of the cathode and a plane surface of the first grid electrode, where an electron beam path is defined, is precisely adjusted during formation of the pre-assembly. The holder and the grid electrodes other than the first grid electrodes are subjected to a beading process so as to mount them on the glass beads with known spacings. After the beading process, the pre-assembly of the cathode base and the first grid electrode is mounted to the holder and the distance between the first and second grid electrodes is adjusted to a given distance.

REFERENCES:
patent: 3230600 (1966-01-01), Barnes
patent: 3426413 (1969-02-01), Griffiths
patent: 4376257 (1983-03-01), Miyazaki et al.

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