Variable vergency focussing apparatus

Details Variable vergency focussing apparatus Variable vergency focussing apparatus

1976-10-22

1978-11-07

Corbin, John K.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

1791003V, 250201, 350175DR, 358128, G02F 129, G11B 708

Patent

active

041242734

ABSTRACT:
The invention relates to variable vergency focussing systems which enable the focussing of a light beam on an object to be maintained despite movements of the object. The invention consists in using as variable-vergency element two astigmatic elements made of electro-optical material which are arranged at 90.degree. relative to one another and are subjected to voltages variable in dependence upon the vergency to be obtained.

REFERENCES:
patent: 3424513 (1969-01-01), Lotspeich
patent: 3695745 (1972-10-01), Furukawa
patent: 3876875 (1975-04-01), Velzel
patent: 3952191 (1976-04-01), Tinet

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