Browse Prior Art Database

Variable Curvature Fluid Lens

IP.com Disclosure Number: IPCOM000052569D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Edwardss, JC: AUTHOR

Abstract

This is an alternative to fixed curvature lenses that must move in relation to each other for changes in focus and magnification.

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Variable Curvature Fluid Lens

This is an alternative to fixed curvature lenses that must move in relation to each other for changes in focus and magnification.

The idea is to construct variable curvature lenses that change shape rather than position to effect the resulting image. The basic concept is that of a see- through chamber with glass on one side and a clear flexible/stretchable membrane on the other. A clear fluid fills the chamber between the glass and the membrane. Control of the fluid pressure by external means provides controlled variation of the curvature of the membrane and, thus, of the lense focusing characteristics.

Additional improvement of the system, i.e., compensation for alterations or distortions of the lense characteristics due to vibrations and/or gravity, may be provided by using a slightly more complex configuration (see figure). The membrane is placed within a chamber with see-through glasses on both ends and, thus, divides the chamber into two cavities. Fluid would be located on either side of the membrane, and the fluid differential pressure would be controlled by a piston. Using fluids of different indexes of refraction and similar densities will provide more stability within the system characteristics.

A further improvement may also be achieved by increasing the number of membranes and, thus, the number of cavities within the original chamber to get a more complex optical system.

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