Electromagnetic focusing

Details Electromagnetic focusing Electromagnetic focusing

1989-04-20

1990-12-04

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

315 535, 335306, H01F 700

Patent

active

049756680

ABSTRACT:
A permanent magnet for an electric lens including at least two ring-shaped permanent magnets, wherein a yoke comprised of a ferromagnetic body having the same inner and outer diameters of adjacent ring-shaped permanent magnets to be inserted into a portion between said both ring-shaped permanent magnets, and said yoke is comprised of a sintered alloy and is provided with one groove or more for taking out a lead wire of a coil assembled in said yoke and said ring-shaped permanent magnets.

REFERENCES:
patent: 4731598 (1988-03-01), Clarke
patent: 4829276 (1989-05-01), Leupold

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