Shadow mask having apertures divided into symmetrical halves by

Details Shadow mask having apertures divided into symmetrical halves by Shadow mask having apertures divided into symmetrical halves by

1978-04-06

1980-06-10

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2907

Patent

active

042074908

ABSTRACT:
Disclosed is a color display tube having a color selection electrode comprised of a metal plate having a large number of apertures and a plurality of elongated conductors insulated from the plate which extend across the apertures and divide them into two substantially symmetrical halves. Upon application of a suitable potential difference between the conductors and the plate, electric fields are produced in the apertures which deflect the portions of the beam passing through the respective aperture halves towards each other forming on the display screen a single, overlapping electron spot of a width smaller than that of the aperture.

REFERENCES:
patent: 2099749 (1937-11-01), Orth
patent: 3383536 (1968-05-01), Moss
patent: 3502942 (1970-03-01), Khan et al.
patent: 3586900 (1971-06-01), Seki et al.
patent: 3888673 (1975-06-01), Suzuki et al.
patent: 4059781 (1977-11-01), Alphen et al.

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