Focus adjusting apparatus provided with a focus lens member form

Details Focus adjusting apparatus provided with a focus lens member form Focus adjusting apparatus provided with a focus lens member form

1988-11-02

1991-02-05

Sugarman, Scott J.

G02B 314, G02B 106, G02B 1500

Patent

active

049899589

ABSTRACT:
A focus adjusting apparatus comprises a focus lens device provided in an optical system. The focus lens device comprises a transparent container of a rectangular prism form, a lens member supported in the container and formed of poly(acrylic amide) gel as a polymer gel substance having electro-reactive deformability, and a pair of transparent electrodes, the container being filled with water-aceton mixture solution. The lens member is formed by two lens materials having different proportions of acrylic acid group. A voltage is applied to the transparent electrodes under control of an automatic focusing circuit to cause electric field in the container, whereby the lens member is deformed in a concentric spherical form to form a lens. When the application of the voltage is stopped, the lens member returns to the initial form. A focal distance of the lens member is changed according to degrees of such deformation of the lens member.

REFERENCES:
patent: 4407567 (1983-10-01), Michelet et al.
patent: 4444471 (1984-04-01), Ford, Jr. et al.
patent: 4784479 (1988-11-01), Ikemori

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