Variable focal length lens

Details Variable focal length lens Variable focal length lens

1990-05-07

1992-08-11

Arnold, Bruce Y.

Optical: systems and elements

Lens

Fluid

359665, 359832, 351158, G02B 106, G02C 100

Patent

active

051384949

ABSTRACT:
A variable focal length lens, for use in spectacles, which includes one or two rigid lenses 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 one of the rigid lenses. Variation of the optical power of the liquid filled lens in one embodiment is achieved by displacement of the outer periphery of the stretched elastomeric membrane. In a second embodiment, both the optical power and the prismatic power of the liquid lens is varied by changing the angle between the membrane support and the rigid lens.

REFERENCES:
patent: 3598479 (1971-08-01), Wright
patent: 3614215 (1971-10-01), Mackta
patent: 4174156 (1979-11-01), Glorieux
patent: 4261655 (1981-04-01), Honigsbaum
patent: 4286839 (1981-09-01), Ilzig et al.
patent: 4300818 (1981-11-01), Schachar
patent: 4444471 (1984-04-01), Ford, Jr. et al.
patent: 4477158 (1984-10-01), Pollock et al.
patent: 4913536 (1990-04-01), Barnea
"A Variable Focus Lens and Its Uses"-Graham J. Opt. Soc. of Amer., vol. 30, Nov., 1940 pp. 560-563.

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