Method, apparatus and adhesive composition for ophthalmic...

B - Operations – Transporting – 24 – B

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B24B 13/005 (2006.01) B29D 11/00 (2006.01) C03C 17/32 (2006.01) C03C 27/04 (2006.01) C08F 290/08 (2006.01) C09D 175/16 (2006.01) C09J 4/06 (2006.01)

Patent

CA 2458863

A method is provided for blocking a lens according to which a lens block (210) is obtained which transmits UV and visible light. An adhesive curable by light within the UV and visible spectrum is applied between the lens blank (60) and a lens mounting face of the lens block (210). The lens blank (60) is placed adjacent the lens block (210) with the adhesive extending therebetween. UV light is applied to cure the adhesive. The adhesive is selected to have a suitable low dimensional change on setting so as not to impart any undue stresses on the lens blank which being capable of total adhesive failure without lens damage or leaving a residue upon application of a suitable stripping force.

L'invention concerne un procédé pour bloquer une lentille dans lequel un blocage de lentille est obtenu, permettant de transmettre des UV et de la lumière visible. Un adhésif durcissable au moyen de lumière, à l'intérieur du spectre d'UV et du spectre visible, est appliqué entre la lentille semi-finie et une surface de montage de lentille du bloc de lentille. La lentille semi-finie est placée adjacente au bloc de lentille, l'adhésif s'étendant entre ces deux éléments. De la lumière UV est appliquée pour faire durcir l'adhésif. L'adhésif est sélectionné pour présenter une modification dimensionnelle faible de manière appropriée, lors du durcissement, de sorte à ne pas conférer de quelconques contraintes non voulues sur la lentille semi-finie, tout en permettant un échec total au niveau de l'adhésif, sans endommager la lentille ou sans laisser de résidu lors de l'application d'une force d'arrachement appropriée.

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