Variable vergency focussing apparatus

Details Variable vergency focussing apparatus Variable vergency focussing apparatus

G - Physics

02

F

345/56, 88/94.5

G02F 1/00 (2006.01) G02F 1/29 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1059601

Abstract of the Disclosure 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° relative to one another and are subjected to voltages variable in dependence upon the vergency to be obtained.

264249

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