Actuation mechanism for variable focus spectacles

Details Actuation mechanism for variable focus spectacles Actuation mechanism for variable focus spectacles

G - Physics

02

C

G02C 5/00 (2006.01)

Patent

CA 2587900

An actuating mechanism for spectacles which include two variable focus lens units. The mechanism mounts on the spectacle bridge; and includes two elongated drive levers mounted near opposite ends of the bridge, each extending toward the other end of the bridge. The free end of each driving lever is connected to its corresponding lens unit through a linkage. The driving levers are caused to rotate simultaneously, but in opposite directions, by a cam that is driven by a sliding member that slides along the bridge. By positioning the sliding member as desired, the spectacles wearer causes the cam to rotate, thereby causing the driving levers to rotate, and both lens units to change focal length.

Mécanisme d~actionnement de lunettes comprenant deux unités à grossissement variable. Le mécanisme est monté sur le pont des lunettes et comprend deux leviers d~actionnement allongés montés à côté des extrémités opposées du pont, en direction de l~autre extrémité du pont. L~extrémité libre de chaque levier d~entraînement est reliée à son unité de verre correspondante au moyen d~une liaison. Les leviers d~entraînement sont amenés à tourner simultanément mais dans des directions opposées, à l~aide d~une came entraînée par un élément coulissant qui coulisse le long du pont. En positionnant l~élément coulissant de la façon désirée, le porteur des lunettes fait tourner la came, provoquant ainsi la rotation des leviers d'entraînement et le changement de distance focale des deux unités de verre.

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