Electron lens equipped with three magnetic pole pieces

Details Electron lens equipped with three magnetic pole pieces Electron lens equipped with three magnetic pole pieces

1981-10-13

1984-05-22

Anderson, Bruce C.

Radiant energy

Invisible radiant energy responsive electric signalling

Flow metering

H01J 2964

Patent

active

044503571

ABSTRACT:
An electron lens equipped with three magnetic pole pieces defining two gaps forming two magnetic fields of opposite polarities. The magnetomotive force of the magnetic field in the upper gap is fixed at a value close to the magnetomotive force providing a minimum focal length under the condition that the magnetomotive forces in both gaps are equal to each other, and a magnetomotive force of the magnetic field in the lower gap is larger than that of the magnetic field in the upper gap, so that not only radial and spiral distortions are eliminated but also the focal length is shortened.

REFERENCES:
patent: 2323328 (1943-07-01), Hillier

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