Method for obtaining an ophthalmic lens
US8919954B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 14, 2012 |
| Grant date | Dec 30, 2014 |
| Priority date | — |
| Expiry date | Nov 14, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D11/00932
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method for obtaining an ophthalmic lens, includes: —the step of selecting a material that displays a threshold of pinhole formation during a machining step of a finished surface (20) in a material-removing depth (D) of 0.07 mm, which is at least 15% higher than the threshold of pinhole formation during a machining step of a finished surface in a material-removing depth (D) of 0.22 mm; —the step of selecting a set point for finishing depth of cut (A) between 0.015 mm and 0.075 mm; and—the step of selecting a set point for finishing feed between 85% and 99% of the threshold of pinhole formation for the material-removing depth (D) given by the sum of the selected set point for finishing depth of cut (A) and the blank roughness (B′).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.