Multipole magnet for electron beam correction

Details Multipole magnet for electron beam correction Multipole magnet for electron beam correction

1982-07-28

1984-12-25

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

335210, 313431, H01F 702

Patent

active

044907036

ABSTRACT:
A permanent magnet used in conjunction with electron beam correction is disclosed which is disk-shaped and exhibits in the plane of the disk an asymmetric quadrapole magnetic field. The strength of the magnetic field between any two adjacent poles is proportional to the distance between the two poles giving four magnetic fields of differing strength in view of the differing distances between the four magnetic poles around the periphery of the disk. A plurality of such magnets can be supported adjacent the envelope of a cathode ray tube to achieve electron beam centering, multiple beam convergence, and the like.

REFERENCES:
patent: 2903327 (1959-09-01), Weber
patent: 2980814 (1961-04-01), Vasilevskis
patent: 3184654 (1965-05-01), Bey
patent: 3191104 (1965-06-01), Mak
patent: 3335377 (1967-08-01), Kohlhagen
patent: 3375389 (1968-03-01), Hughes
patent: 3514729 (1970-05-01), Webb
patent: 3701065 (1972-10-01), Mirsch
patent: 3873953 (1975-03-01), Puhak
patent: 3898597 (1975-08-01), Vonk
patent: 4091347 (1978-05-01), Barbin
patent: 4162470 (1979-07-01), Smith
patent: 4295110 (1981-10-01), Uesaka et al.

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