Color cathode-ray tube having internal magnetic shield

Details Color cathode-ray tube having internal magnetic shield Color cathode-ray tube having internal magnetic shield

1997-10-15

2000-02-01

Day, Michael H.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, 313479, H01J 2906

Patent

active

060206780

ABSTRACT:
A color cathode-ray tube including a panel portion, a neck portion and a funnel portion connecting these two portions and having an internal magnetic shield, wherein the internal magnetic shield is disposed in the funnel portion and made of a substantially quadrangular pyramid-shaped frame structure which has a substantially rectangular first opening of small diameter at one end adjacent to an electron gun and a substantially rectangular second opening of large diameter at the other end adjacent to a shadow mask and creased lines formed between corresponding corners of the first and second openings, side faces of the internal magnetic shield opposite to each other being formed with substantially V-shaped notches respectively in the portions thereof adjacent to the first opening, and each of the creased lines of the internal magnetic shield is formed in such a manner that an end of an imaginary line extension of the creased line adjacent to the second opening is located on a projected plane parallel to the second opening at a point shifted by a predetermined length from the corresponding corner of the second opening in the direction of side of the second opening and a segment is made by connecting a predetermined point on a line connecting between the end of the imaginary line extension and the corresponding corner of the first opening to the corresponding corner of the second opening so as to form a part of the creased line adjacent to the second opening.

REFERENCES:
H. Yoshida et al., High Resolution Color Display Tubes for Display Terminals, Hitachi Review vol. 32, No. 1, pp. 33-36, 1983 (no month).

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