Cathode ray tube with multipole correction ring

Details Cathode ray tube with multipole correction ring Cathode ray tube with multipole correction ring

1980-09-22

1984-01-03

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313437, H01J 2974

Patent

active

044244665

ABSTRACT:
A cathode ray tube including, in an evacuated envelope, at least one electron gun to generate an electron beam directed onto a target, and first and second pairs of deflection plates for deflecting the electron beam in two mutually perpendicular directions. Various defects in the displayed image are corrected by providing at least one ring of magnetizable material, permanently magnetized as a multipole, between the first pair of deflection plates and the target.

REFERENCES:
patent: 2102421 (1937-12-01), Kuehni
patent: 2258643 (1941-10-01), De Gier et al.
patent: 2619607 (1952-11-01), Steers
patent: 3023336 (1962-02-01), Frenkel
patent: 3217200 (1965-11-01), Gethmann
patent: 3819984 (1974-06-01), Hawken
patent: 4220897 (1980-09-01), Barten et al.

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