Inline type color picture tube having coma distortion correcting

Details Inline type color picture tube having coma distortion correcting Inline type color picture tube having coma distortion correcting

1988-02-19

1989-10-31

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313412, 313413, 313431, H01J 2951

Patent

active

048779938

ABSTRACT:
The present invention relates to an inline type color picture tube having a coma distortion correcting mechanism in electron guns. A shield cup is attached to the tips of the electron guns. Three electron beam through-holes are formed in the shield cup in the inline direction. Ring-shaped magnetic material members are arranged around the two outside electron beam through-holes among those three through-holes. This magnetic material member is made of a material of a high permeability. Further, each ring-shaped magnetic material has a gap portion on the side opposite to the central electron beam through-hole. The gap portions of the ring-shaped magnetic materials arranged around both of the outside through-holes have shapes which are symmetrical in the lateral direction around the central electron beam through-hole as a center.

REFERENCES:
patent: 3873879 (1975-03-01), Hughes
patent: 4196370 (1980-04-01), Hughes
patent: 4225804 (1980-09-01), Bekaert et al.
patent: 4547697 (1985-10-01), Burdick et al.

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