Focus magnet with separate static and dynamic control coils

Details Focus magnet with separate static and dynamic control coils Focus magnet with separate static and dynamic control coils

1991-05-23

1992-05-12

Broome, Harold

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

335213, 335306, 315 535, 250396ML, H01F 312, H01F 700, H01J 2308

Patent

active

051131625

ABSTRACT:
A focus magnet having (a) three axially magnetized hollow cylindrical permanent magnets disposed concentrically along a center axis of a cathode ray tube such that their opposite magnetic poles face each other; (b) yokes in the form of hollow discs disposed on both sides of the permanent magnets; (c) a static control coil disposed inside a center permanent magnet; (d) a horizontal dynamic control coil disposed inside one of side permanent magnets; and (e) a vertical dynamic control coil disposed inside the other side permanent magnet, whereby electron beams passing in the cathode ray tube are converged to a small spot diameter.

REFERENCES:
patent: 3686527 (1972-08-01), Gabor
patent: 4975668 (1990-12-01), Nishinuma

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