Grinding machine for forming the edge of an ophthalmic lens
US4596091A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 22, 1984 |
| Grant date | Jun 24, 1986 |
| Priority date | — |
| Expiry date | Mar 22, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T409/30196
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a method for bevelling an ophthalmic lens, the lens is rotated about its own axis and is also displaced parallel to its axis as a function of its angle of rotation. Simultaneously, the edge of the lens is kept in contact with a grinding wheel. Thus the point of contact of the lens with the grinding wheel is constrained to follow a specific path. The specific path to be followed by the point of contact is an intermediate path selected between two paths resulting from a comparison between a collection of predetermined paths and two reference paths. The reference paths are each obtained from a plotting operation carried out prior to the bevelling operation on the ophthalmic lens using feelers. This method is used in grinding machines such that trimming and bevelling of ophthalmic lenses can be automatically performed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.