Colour cathode ray tube having a screening cap

Details Colour cathode ray tube having a screening cap Colour cathode ray tube having a screening cap

1993-10-27

1995-04-18

Brinich, Stephen

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, H01J 2980

Patent

active

054081580

ABSTRACT:
A color cathode ray tube comprises a color selection electrode which is secured to a frame and a magnetic screening cap. The frame has two diaphragm portions one of which is located near the color selection electrode and the other is further removed from the color selection electrode. The distance between the electron beams deflected towards the outermost apertures of the color selection electrode and the further removed diaphragm is at least 1 cm. By virtue thereof, the negative influence of the frame on the screening effect of the magnetic screening cap is substantially reduced.

REFERENCES:
patent: 4472657 (1984-09-01), Sakurai et al.
patent: 4652792 (1987-03-01), Tokita et al.
patent: 5023507 (1991-06-01), Dougherty et al.
patent: 5298832 (1994-03-01), Jeong et al.
R. Casanova Alig & Ralph J. D'Amato, Computer-Aided Design And Analysis Of Magnetic Shields For Color Picture Tubes, Proceedings of the SID, vol. 30/4, 1989, pp. 287-296.

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