Rimless spectacle lens bore polishing method and apparatus
US7726808B1 · kind B1 · utility
2Cited by
11References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 20, 2009 |
| Grant date | Jun 1, 2010 |
| Priority date | — |
| Expiry date | May 20, 2029 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24B5/485
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for improving the performance of rimless spectacle lenses. An abrasive wire is provided for polishing bore holes which are drilled in lenses. The abrasive wire includes a wire substrate with abrasive particles embedded along its length. The wire and particles are dimensioned for threading through the bore hole and allowing space to perform a soft-filing operation. By polishing the micro cracks formed during drilling, propagation leading to lens failure which arises from spectacle use can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.