Shaped plastic light-polarizing lens and method of making same

Details Shaped plastic light-polarizing lens and method of making same Shaped plastic light-polarizing lens and method of making same

G - Physics

02

B

G02B 5/30 (2006.01) B29D 11/00 (2006.01) G02B 3/00 (2006.01) G02C 7/12 (2006.01)

Patent

CA 2146258

Plastic lenses having substantially no op- tical power and a light-polarizing layer therein are prepared by shaping composite laminate of the light-polarizing layer (10) between op- posed sheets of thermoplastic material (12, 14) by heating and pressing the laminate between opposed shaping molds (platens), the platens having predetermined radii of curvature for the production a lens having substantially no op- tical power. Shaping is effected under condi- tions of heating and pressing sufficient to cause flow of the thermoplastic sheets and conforma- tion thereof to the respective curvatures of the forming surfaces of the platens. The lenses are especially suited as sunglass lenses for spectacles.

Verres plastiques n'ayant pratiquement pas de puissance optique et contenant une couche polarisant la lumière, qui sont fabriqués en conférant une forme à un stratifié composite constitué d'une couche polarisant la lumière (10) entre des feuilles opposées de matériau thermoplastique (12, 14), par chauffe et pression dudit stratifié entre des moules de mise en forme opposés (plateaux), lesdits plateaux ayant des rayons de courbure prédéterminés pour la production de verres n'ayant pratiquement aucune puissance optique. La mise en forme est effectuée dans des conditions de chauffe et de pressage suffisantes pour provoquer la coulée des feuilles thermoplastiques et pour que ces dernières épousent les courbures respectives des surfaces de mise en forme des plateaux. Lesdits verres sont particulièrement adaptés comme verres pour des lunettes de soleil.

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