An actuation mechanism for variable focal length eyeglasses

G - Physics – 02 – C

Patent

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G02C 7/08 (2006.01)

Patent

CA 2180743

Variable power eyeglasses of many shapes can be manufactured having a frame, a pair of lens assemblies and a linear actuation mechanism. Each lens assembly includes: a rigid substrate; a membrane support spaced from the rigid susbtrate; a flexible seal extending between the rigid substrate and the membrane support, where the flexible seal acts as a hinge at a first section and acts as a spring by allowing relative motion between the rigid substrate and the membrane support at a second section; a transparent elastomeric membrane sealed around a periphery to the membrane support; and a transparent liquid filling the space between the rigid substrate and the membrane forming a liquid lens. The linear actuation mechanism causes relative motion between the membrane and the rigid substrate so that both optical and prismatic power of the liquid lens change by varying a force applied to the flexible sealing means at the second section. The linear actuation mechanism is positioned within a plane of the lens assemblies and includes: a pair of sliders connected via a wire passing through a tube mounted onto the frame; a pair of cams with one of the cams attached to each end of the pair of sliders; and a pair of cam followers responsive to the cams causing relative motion in response to movement of the sliders.

Il est possible de fabriquer des lunettes à focale variable de diverses formes comportant une monture, un paire de systèmes de verres et un mécanisme de commande linéaire. Chacun des systèmes de verres comporte: un substrat rigide, une membrane support distante du substrat rigide, un joint souple placé entre ces éléments, dont une première partie sert de charnière et une deuxième partie de ressort permettant un mouvement relatif entre le substrat et la membrane, une membrane transparente d'élastomère entourant de manière étanche la membrane support, et un liquide transparent remplissant l'espace entre le substrat support et la membrane support et formant une lentille liquide. Le mécanisme de commande linéaire produit entre la membrane et le substrat rigide un mouvement relatif qui modifie la puissance optique et la puissance prismatique de la lentille liquide en faisant varier la force appliquée à la deuxième partie du joint souple. Le mécanisme de commande linéaire, placé dans un plan du système de verres, comporte une paire de curseurs, reliés par un fil traversant un tube solidaire de la monture, une paire de cames (une fixée à chaque curseur), une paire de poussoirs actionnés par les cames et produisant un mouvement relatif en réponse au mouvement du curseur.

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