Blanks for making prescription eyeglass lenses
US5042935A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1990 |
| Grant date | Aug 27, 1991 |
| Priority date | — |
| Expiry date | Jun 19, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24B13/06
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
In a method and apparatus for making a lens for a pair of prescription eyeglasses a lens blank is shaped and finished on one of its major surfaces through the use of a machine controlled by the prescription information and with a new expendable lap being made each time a new lens is wanted. A machine for cutting a lens blank and/or a lap blank is controlled in three axes by a set of point data related to and obtained in response to the input into the control system for the machine of prescription information. Lap blanks and lens blanks usable by the machine are distinguishable from one another by each lap blank, or each lens blank, having an anomaly, such as a piece of magnetic material detectable by a sensor or the blank is rotated by the machine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.