Two-aperture immersion lens

Details Two-aperture immersion lens Two-aperture immersion lens

1974-05-08

1976-02-03

Segal, Robert

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313429, 313432, H01J 2962, H01J 2980

Patent

active

039366936

ABSTRACT:
A two-aperture immersion lens comprising two substantially parallel plates having a plurality of optically aligned apertures therein is disclosed for an electron optical system. The spacing between the plates and the dimensions of the apertures are selected to provide spherical aberration characteristics which are substantially lower than those for the three-aperture Einzel lens. Also, higher beam current densities and longer cathode lifetimes are provided for electron beam systems by employing two-aperture immersion lenses.

REFERENCES:
patent: 2452919 (1948-11-01), Gabor
patent: 2954499 (1960-09-01), Gundert et al.
patent: 3040205 (1962-06-01), Walker
patent: 3534219 (1970-10-01), Newberry
patent: 3604969 (1971-09-01), Blumenberg

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