Variable shaped spot electron beam pattern generator

Details Variable shaped spot electron beam pattern generator Variable shaped spot electron beam pattern generator

1987-11-12

1989-04-25

Albritton, C. L.

Electric heating

Metal heating

By arc

21912127, 250396ML, B23K 1500

Patent

active

048250333

ABSTRACT:
The electron beam 2 of the generator illuminates a first rectangular aperture 4 which is then imaged on a second rectangular aperture 10 by a magnetic lens 7 having reversible flux. The flux of the lens is chosen so that the focused image of the first aperture is rotated by 22.5+45n degrees where n=0,1,2 etc. One flux direction places the aperture image sides 8 parallel to the second aperture sides so that a rectangular shaped beam emerges. The other flux direction places the aperture image sides 8' at 45 degrees to the second aperture sides so that a triangular shaped beam emerges. A beam deflector 6 between the apertures allows rectangles or 45 degree isoceles triangles of a range of sizes to be produced. Thus triangles are produced without further generator components being needed.

REFERENCES:
patent: 4413187 (1983-11-01), Akazawa et al.

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