Cup member of an in-line electron gun capable of reducing a coma

Details Cup member of an in-line electron gun capable of reducing a coma Cup member of an in-line electron gun capable of reducing a coma

1986-08-21

1987-04-21

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313414, 313440, 315 14, H01J 2951, H01J 2976

Patent

active

046599614

ABSTRACT:
For use in an in-line electron gun of a cathode ray tube, a cup member comprises a planar plate having three apertures aligned with one another and a collar portion protruded from the planar plate. A height of the collar portion is between 2 mm and 6 mm, both inclusive. The collar portion may be either uniform in height or divided into a first pair of protrusions transversely of a predetermined straight line passing through the three apertures and a second pair of protrusions contiguous to the first pair of protrusions and lower in height than the first pair of protrusions.

REFERENCES:
patent: 4225804 (1980-09-01), Bekaert et al.
patent: 4415831 (1983-11-01), Konosu

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