An optic incorporating a power gradient

Details An optic incorporating a power gradient An optic incorporating a power gradient

B - Operations, Transporting

29

D

B29D 11/00 (2006.01) G02C 7/06 (2006.01)

Patent

CA 2265973

A progressive optic (10) has an optical preform (30) wherein the radius of curvature of the surface is altered by forming discrete spherical portions (20) across the surface. A thin intermediate layer (40), having a different refractive index from the optical preform (30), is then cast over the formed optical preform surface. The optical preform (30) having the thin intermediate layer (40) is then cast with a resin superstrate layer (60) which restores the curve of the optic (10). Each spherical section (50), defined by spherical portions (20) and corresponding portions of outer surface of the superstrate layer (60), alters the spherical power of the adjacent spherical section (50) by about .03D to .05D.

Cette optique progressive (10) se compose d'une préforme optique (30) dont on modifie le rayon de courbure de la surface en formant des portions sphériques distinctes (20) sur toute la surface. On coule ensuite sur la surface de la préforme optique ainsi formée, une couche mince intermédiaire (40) présentant un indice de réfraction différent de celui de la préforme optique (30). Puis on coule sur cette préforme optique (30) pourvue de la couche mince intermédiaire (40) une couche supérieure de résine (60), laquelle rétablit la courbe de l'optique (10). Chaque section sphérique (50), délimitée par des portions sphériques (20) et par des portions correspondantes de surface extérieure de la couche supérieure (60), modifie la puissance sphérique de la section sphérique adjacente (50) d'environ 0,03 D à 0,05 D.

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