Spectacles using variable focal length lenses which have an...

G - Physics – 02 – C

Patent

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G02C 7/08 (2006.01) G02B 3/14 (2006.01) G02B 15/02 (2006.01) G02C 1/00 (2006.01)

Patent

CA 2185897

A variable focal length lens whose peripheral shape can be arbitrarily specified, for use in spectacles, which includes a rigid lens (12) to provide the wearer's distance correction, and a liquid-filled lens bounded by a stretched distensible elastomeric membrane (15) to provide a variable near addition. The liquid (21), 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. This is accomplished by supporting the membrane on a transparent spacing member which has substantially the same refractive index as the liquid and which includes a circular opening which defines the free area of the membrane. A pair of spectacles is comprised of two variable focal length lenses mounted to a frame with an actuator for adjusting their focal lengths mounted on the frame between the lenses.

Verre à focale variable dont la forme périphérique peut être arbitrairement spécifiée, destiné à être utilisé dans des lunettes, qui inclut un verre rigide (12) destiné à fournir à l'utilisateur la correction des distances, et un verre rempli de liquide entouré par une membrane (15) élastomère étirée et dilatable destiné à fournir une correction supplémentaire de près variable. Le liquide (21), d'un volume fixe, est contenu dans le champ de vision entre la membrane élastomère et le verre rigide. La variation de la puissance optique du verre rempli de liquide est obtenue par déplacement d'un support de membrane auquel est attachée la périphérie externe de la membrane élastomère étirée. La forme de la membrane dilatable est maintenue pratiquement sphérique, en dépit du fait que la circonférence de la membrane n'est pas circulaire. On y parvient en plaçant la membrane sur un élément d'écartement transparent qui a sensiblement le même indice de réfraction que le liquide et qui comporte une ouverture circulaire définissant la zone libre de la membrane. Une paire de lunettes est composée de deux verres à focale variable montés sur une monture dotée d'un dispositif d'actionnement destiné au réglage des focales et monté sur la monture entre les verres.

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