Field emission gun improvement

Details Field emission gun improvement Field emission gun improvement

1974-10-21

1976-03-23

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Combined load device or load device temperature modifying...

Distributed parameter resonator-type magnetron

250311, 315 12R, 315 17, 315 16, 313449, H01J 2956

Patent

active

039462684

ABSTRACT:
A field emission gun for use in an instrument such as an electron microscope including the field emission tip, an extraction electrode and focusing and accelerating anode means wherein there is disposed between the tip and the accelerating field of the anode means an electric field of a strength expressed in terms of electron voltage, at least equal to the lowest energy secondary electron sought to be prevented from entering the accelerating field.

REFERENCES:
patent: 2407906 (1946-09-01), Rose
patent: 2716204 (1955-08-01), Rodenhuis
patent: 2888606 (1959-05-01), Beam
patent: 2983842 (1975-10-01), Hrbek
patent: 3784815 (1974-01-01), Coates et al.
patent: 3873878 (1975-03-01), Odenthal

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