Color cathode ray tube with an internal magnetic shield

Details Color cathode ray tube with an internal magnetic shield Color cathode ray tube with an internal magnetic shield

1996-08-02

1998-06-30

Horabik, Michael

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313479, H01J 2906

Patent

active

057739242

ABSTRACT:
A color cathode ray tube includes an envelope having a front panel and a funnel joined to periphery of the front panel; a phosphor screen disposed on an inner surface of the front panel; a shadow mask disposed to face the phosphor screen and having a plurality of apertures for passing electron beams; an electron gun disposed in a neck of the funnel and emitting the electron beams toward the shadow mask; and a magnetic shield disposed within the envelope and surrounding a path along which the electron beams travel. The magnetic shield has a first side plate, a third side plate facing the first side plate, a second side plate, a fourth side portion facing the second side plate, a first opening on the side of the shadow mask, and a second opening on the side of the electron gun, thereby forming almost a hollow frustum of quadrangular pyramid, and only each of the first and third side plates has notches in the vicinity of both ends of edges of the first and third side plates on the side of the second opening.

REFERENCES:
patent: 5336962 (1994-08-01), Keller
patent: 5363010 (1994-11-01), Van Mensvoort

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