Method and apparatus for masking removable optical lens markings during lens grinding
US5343657A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 18, 1992 |
| Grant date | Sep 6, 1994 |
| Priority date | — |
| Expiry date | Sep 18, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/8305
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for protecting removable markings on an optical lens during grinding thereof to a desired prescription. A mask is placed over the markings prior to application of an adhesive tape, to which a low temperature alloy block is bonded for holding of the lens during grinding. The mask preferably covers only the markings, and is transparent to allow alignment thereof. Preferably the mask is held in place on the lens surface without the use of an adhesive, although a low tack adhesive may be used which does not remove the markings when the mask is peeled away from the lens. A preferred material for the mask is a static cling vinyl.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.