Method for manufacturing a spectacle-glass for myopes
US4707949A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1986 |
| Grant date | Nov 24, 1987 |
| Priority date | — |
| Expiry date | Jul 15, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method for manufacturing a spectacle-glass for myopes, starting for simplicity sake from a semi-finished glass, that is a glass having on the inner side, a slight concave hollowing, which comprises computing according to the desired diopter value, the required curvature, and with torus-like grinding, the so-called cross-curvature, and computing according to the desired field of view, a second curvature, whereafter the glass is arranged in a generator and a center hollowing is milled according to the basic curvature, while thereafter the glass edge around the center hollowing is milled according to said second curvature, and the center hollowing of the thus-machined glass is finished, respectively polished, by using a tool with convex radiusing which corresponds to the basic curvature, whereafter the edge is subjected to at least one finishing operation and one polishing operation by using an implement with a convex radiusing which corresponds to said second curvature, whereby moreover use is made of a resilient intermediate part between said implement and a finishing pad, respectively polishing pad.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.