公开(公告)号：DE3862171D1

公开(公告)日：1991-05-02

申请号：DE3862171

申请日：1988-06-17

Applicant: ESSILOR INT

Inventor： BOURSET CLAUDE ,  WAJS GEORGES

IPC: B29C35/12 ,  B29D11/00 ,  B29K96/00 ,  B29L11/00 ,  G02C7/04

Abstract: In this method of manufacturing a flexible contact lens from a protein biological material, such as a protein polymer of the gelatine type or a type IV enriched human collagen, a hydrogel is first made by hydrating the protein biological material, in water or a physiological serum. A lens preform is then made from the hydrogel at a temperature between ambient temperature and the temperature at which the material liquefies, at which temperature the hydrogel has a paste-like consistency. This preform, which reproduces the shape of the finished lens with a greater or lesser degree of accuracy, but always with excess material, is then placed in a mold made from a low-loss dielectric material. The mold is in at least two parts which, when locked together, define a three-dimensional shape and a finished lens surface state. The hydrogel is then liquefied by irradiating the mold with an electromagnetic field at a frequency between 108 and 1010 Hz. The parts of the mold are then locked together and the hydrogel is then gelified by cooling it in the mold. Finally, the hydrogel is then removed from the mold and is cross-linked by contact with a cross-linking agent such as an aldehyde. The resulting lenses have excellent shape and surface state characteristics and are very well tolerated biologically.

公开(公告)号：AU533126B2

公开(公告)日：1983-11-03

申请号：AU4397579

申请日：1979-02-06

Applicant: ESSILOR INT

Inventor： BOURSET CLAUDE ,  LENNE WILLIAM

IPC: G02C7/04 ,  B29B13/00 ,  B29C33/00 ,  B29C33/40 ,  B29C33/42 ,  B29C39/00 ,  B29C39/26 ,  B29C43/00 ,  B29C45/26 ,  B29C45/37 ,  B29C61/00 ,  B29D11/00 ,  B29L11/00

Abstract: A molding assembly for casting soft contact lenses especially such lenses formed of hydrophobic material. Such a molding assembly comprises a molding cavity defined by the dies of the assembly and an annular gasket or sealing member joining the peripheries thereof. The perimeter of largest diameter of the molding cavity is defined by contact between a sealing ridge which is part of the concave die or the gasket or sealing member and a bearing surface which is part of the other of the concave die or the gasket or sealing member. The annular gasket or sealing member may have an annular skirt adapted to embrace the concave die in the closed position of the assembly. The gasket or sealing member is carried by the convex die and may be integrally formed in one piece with the convex mold.

公开(公告)号：DE2960794D1

公开(公告)日：1981-12-03

申请号：DE2960794

申请日：1979-01-25

Applicant: ESSILOR INT

Inventor： BOURSET CLAUDE ,  LENNE WILLIAM

IPC: G02C7/04 ,  B29B13/00 ,  B29C33/00 ,  B29C33/40 ,  B29C33/42 ,  B29C39/00 ,  B29C39/26 ,  B29C43/00 ,  B29C45/26 ,  B29C45/37 ,  B29C61/00 ,  B29D11/00 ,  B29L11/00 ,  B29D11/02 ,  B29C1/00

Abstract: A molding assembly for casting soft contact lenses especially such lenses formed of hydrophobic material. Such a molding assembly comprises a molding cavity defined by the dies of the assembly and an annular gasket or sealing member joining the peripheries thereof. The perimeter of largest diameter of the molding cavity is defined by contact between a sealing ridge which is part of the concave die or the gasket or sealing member and a bearing surface which is part of the other of the concave die or the gasket or sealing member. The annular gasket or sealing member may have an annular skirt adapted to embrace the concave die in the closed position of the assembly. The gasket or sealing member is carried by the convex die and may be integrally formed in one piece with the convex mold.