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AssigneeEssilor International (Compagnie Generale d'Optique)
InventorsRoland Mandler, Walter Danhardt, Dan Riall, Marc Silva
Estimating the term…
For manufacturing ophthalmic lenses and other optical form bodies made of plastic material, plastic form parts are used which are made by non-cutting shaping and are then further worked by mechanical production steps. Said plastic form parts are circular blanks (1) made of two different plastic materials which are firmly joined to each other. Thereby, an interior lens element (2) that consists of a high-quality material is concentrically surrounded by a ring fixture (3) which consists of a low priced material. Either surface of the lens element (2) may feature any given geometry. During mechanical working, the ring fixture (3) is used for mounting as well as for depositing and, in addition, for stabilizing the workpiece (9). For this reason it is partially maintained throughout the mechanical working and is cut off at the end only.
1-19. (canceled)
A circular blank for manufacturing ophthalmic lenses and other form bodies made of plastic material, comprising a lens element made of a high-quality optical material which is worked using mechanical production steps, wherein the lens element is surrounded by a ring fixture made of a low-cost material, wherein the lens element and the ring fixture made of two different plastic materials are firmly connected to each other, and wherein the ring fixture is mountable in a mounting tool of a working machine and is machinale together with the lens element.
Dependencies are inferred from the claim text.