Composite electromagnetic lens with variable focal distance

Details Composite electromagnetic lens with variable focal distance Composite electromagnetic lens with variable focal distance

1990-03-07

1991-08-06

Berman, Jack I.

Radiant energy

With charged particle beam deflection or focussing

Magnetic lens

335210, H01J 322

Patent

active

050380451

ABSTRACT:
The lens is formed by the association of two electromagnetic lenses sharing one and the same magnetic circuit crossed by one and the same central channel. The first lens is a shielded lens and has an annular gap at one of its ends. This annular gap cuts the central channel along a direction the plane of which is perpendicular to the optical axis. The second lens is a single-pole lens surrounding the annular gap of the first lens. It has an annular gap demarcated by two lips, the walls of which have shapes generated by revolution around the optical axis. Induction coils enable the magnetic flux of the gaps to be made to vary.

REFERENCES:
patent: 4419581 (1983-12-01), Nakagawa
Patent Abstracts of Japan, vol. 9, No. 219; Sep. 6, 1985, JP 60-79653.
Patent Abstracts of Japan, vol. 8, No. 209, Sep. 22, 1984; JP 59-94350.

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