LENS UNIT FILLED WITH LIQUID WITH VARIABLE FOCAL DISTANCE Russian patent published in 2015 - IPC G02B3/14 G02C7/06 

FIELD: physics, optics.

SUBSTANCE: optical device with a variable focal distance comprises a rigid curved transparent optical component, two transparent expansible membranes adjoining the perimeter of the rigid optical component and defining two cavities, the first cavity being situated between the rigid optical component and the first membrane, and the second cavity being situated between the first membrane and the second membrane, and a reservoir containing an additional liquid and enabling injection of the liquid into the cavity or removal thereof. The radii of curvature of the front and back surfaces of the rigid optical component are bent in one direction. The radius of curvature of the front surface is less than the radius of curvature of the back surface, such that the intersection of said surfaces is the peripheral edge of the rigid optical component.

EFFECT: enabling adjustment of optical power in a wide range without significant effect on the outward appearance, service life or image quality.

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