Electron gun with means for expanding the focussing lens field

Details Electron gun with means for expanding the focussing lens field Electron gun with means for expanding the focussing lens field

H - Electricity

01

J

355/10

H01J 29/56 (2006.01) H01J 29/48 (2006.01) H01J 29/50 (2006.01)

Patent

CA 1041217

ABSTRACT An electron gun for producing and directing preferably a plurality of electron beams has a wide focussing lens gap within which is disposed conductive means, preferably a plurality of apertured metal plates. resistive means such as a thin cermet film serves to distribute voltages to the plates such that an electrostatic focussing field is generated which duplicates that in a large aperture lens.

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