Variable focus lens and spectacles

Details Variable focus lens and spectacles Variable focus lens and spectacles

G - Physics

02

B

G02B 3/14 (2006.01) G02C 7/08 (2006.01)

Patent

CA 2667437

A variable focus lens (10) comprises a ring (20) with a front surface and a rear surface. A flexible membrane (40) is held between the front surface of the ring and a generally rigid transparent front cover (50), and a rear cover (60) is mounted on the rear surface of the ring, such that a cavity formed between the flexible membrane and the rear cover can be filled with a liquid. The amount of fluid in the cavity can be varied to vary the curvature of the flexible membrane and so vary the optical characteristics of the lens. The ring is provided with an integral hollow extension (22), whose hollow interior (24) communicates with the cavity and forms a liquid reservoir for the variable focus lens (10). The invention also extends to spectacles using the lens.

Verre à foyer variable (10) comprenant un anneau (20) pourvu d'une surface frontale et d'une surface arrière. Une membrane flexible (40) est maintenue entre la surface frontale de l'anneau et un couvercle frontal transparent généralement rigide (50), et un couvercle arrière (60) est fixé sur la surface arrière de l'anneau, de telle sorte qu'une cavité formée entre la membrane flexible et le couvercle arrière peut être remplie d'un liquide. La quantité de fluide dans la cavité peut être modifiée pour faire varier la courbure de la membrane flexible et faire varier ainsi les caractéristiques optiques du verre. L'anneau est doté d'un prolongement creux intégré (22), dont la partie intérieure creuse (24) communique avec la cavité et forme un réservoir de liquide pour le verre à foyer variable (10). L'invention s'étend également aux lunettes utilisant ce verre.

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