Method for manufacturing ophthalmic lenses using circular blanks
US8685292B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2004 |
| Grant date | Apr 1, 2014 |
| Priority date | — |
| Expiry date | Nov 18, 2026 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D11/00009
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.