Radiant energy – With charged particle beam deflection or focussing – Magnetic lens
Patent
1983-05-13
1985-10-01
Anderson, Bruce C.
Radiant energy
With charged particle beam deflection or focussing
Magnetic lens
250396ML, 250423F, H01J 3773
Patent
active
045448450
ABSTRACT:
An electron gun having a field emission cathode is provided with a focusing magnetic lens. In the vicinity of the cathode, a pole piece is defined by two parts. The orifice of the part closer to the cathode is smaller than that positioned downstream. The air gap between the two parts is small and the filament of the cathode extends up to a distance of from about 1.5 to 3 mm from the median plane of the air gap. The excitation of the coil of the focusing magnetic lens is provided such that the image of the electronic source is substantially positioned at the level of the orifice of an intermediate electrode surrounding at least the magnetic lens.
REFERENCES:
patent: 3509503 (1970-04-01), Yanaka et al.
patent: 3678333 (1972-07-01), Coutes et al.
patent: 3862419 (1975-01-01), Veneklasen
patent: 4315152 (1982-02-01), Smith
Optic, vol. 57, No. 3, Dec. 1980, M. Troyon: "High Current Efficiency Field Emission Gun System Incorporation . . . ", pp. 401-419.
Processings of the Symposium on Electron and Ion Beam Science and Technology, vol. 78-5, 1979, H. P. Kuo: "A High Brightness . . . ", pp. 3-9.
Anderson Bruce C.
Guss Paul A.
University de Reims Champagne Ardenne
LandOfFree
Electron gun with a field emission cathode and a magnetic lens does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electron gun with a field emission cathode and a magnetic lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electron gun with a field emission cathode and a magnetic lens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1444337