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Variable Focal Length Lens System

IP.com Disclosure Number: IPCOM000061388D
Original Publication Date: 1986-Jun-01
Included in the Prior Art Database: 2005-Mar-09
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Scott, WD: AUTHOR

Abstract

A variable focal length lens in which pressurized fluid is contained within a one-piece flexible membrane. Changes in the pressure on the fluid affect changes in the focal length of the lens, and changes in the cross section of the membrane affect changes in the curvature of the lens. Further, selection of a fluid with an index of refraction different from the index of refraction of the membrane adjust for chromatic variation.

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Variable Focal Length Lens System

A variable focal length lens in which pressurized fluid is contained within a one-piece flexible membrane. Changes in the pressure on the fluid affect changes in the focal length of the lens, and changes in the cross section of the membrane affect changes in the curvature of the lens. Further, selection of a fluid with an index of refraction different from the index of refraction of the membrane adjust for chromatic variation.

The figure is a side view of the lens system 1 wherein retaining rings 2 secure the outside edges of a flexible membrane 3 containing a lens fluid 4 pressurized by a pump 5. The flexible membrane 3 deflects as the pressure changes, changing the focal length of the lens, with a greater pressure leading to a shorter focal length and a lesser pressure leading to a longer focal length. The flexible membrane 3 may have a constant cross section, resulting in a parabolic curvature of the lens. Chromatic aberations may be corrected by choosing a lens fluid 4 w has an index of refraction slightly different from that of the membrane 3. The present contribution is simple, while allowing an infinitely variable lens system which allows any desired lens curvature and adjusts for chromatic variation.

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