Shadow mask having magnetic quadrupoles around each mask apertur

Details Shadow mask having magnetic quadrupoles around each mask apertur Shadow mask having magnetic quadrupoles around each mask apertur

1976-12-16

1979-01-16

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2907, H01J 3120

Patent

active

041351118

ABSTRACT:
A cathode ray tube for displaying colored pictures of the post focusing type. A magnetic quadrupole lens is formed in each aperture of the color selection means. The defocusing direction of quadrupole lenses is parallel to the phosphor strips of the display screen.

REFERENCES:
patent: 2717323 (1955-09-01), Clay
patent: 2972073 (1961-02-01), Clay
patent: 3136910 (1964-06-01), Kaplan
patent: 3354336 (1967-11-01), Rennick
patent: 4059781 (1977-11-01), Van Alphen et al.

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