Non-circular variable focus lens

Details Non-circular variable focus lens Non-circular variable focus lens

1993-02-04

1994-12-06

Look, Edward K.

Optical: systems and elements

Lens

Fluid

351 41, 351158, G02B 314, G02C 708

Patent

active

053716299

ABSTRACT:
A non-circular variable focal length lens, for use in spectacles, which includes a rigid lens to provide the wearer's distance correction, and a liquid-filled lens bounded by a distensible stretched elastomeric membrane to provide a variable near addition. The liquid, which has a fixed volume, is stored in the field of view between the elastomeric membrane and the rigid lens. Variation of the optical power of the liquid filled lens is achieved by displacement of a membrane support to which the outer periphery of the stretched elastomeric membrane is attached. The shape of the distended membrane is kept substantially spherical, despite the circumference of the membrane being non-circular, by allowing the membrane support to bend in a predetermined controlled manner as it is moved.

REFERENCES:
patent: 1269422 (1918-06-01), Gordon
patent: 2576581 (1951-11-01), Edwards
patent: 3598479 (1971-08-01), Wright
patent: 4181408 (1980-01-01), Senders
patent: 4261655 (1981-04-01), Honigsbaum
patent: 4403840 (1983-09-01), Okun
patent: 4913536 (1990-04-01), Barnea
patent: 5124734 (1992-06-01), Barnea
patent: 5138494 (1992-08-01), Kurtin
patent: 5182585 (1993-01-01), Stoner

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