Lens block and method of processing lenses
US6110016A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1998 |
| Grant date | Aug 29, 2000 |
| Priority date | — |
| Expiry date | Jun 22, 2018 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB24B13/005
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A two-piece lens block allows for the rotation of an edged lens blank in order to align the cylinder of the lens blank correctly. The lens block includes a substantially cylindrical base having a first surface facing the lens blank and an opposed second surface with a plurality of driving recesses extending into the base from the second surface. A ring member surrounds the base and includes a mounting surface generally adjacent to the lens blank. The ring member is rotatable relative to the base prior to the attachment of the lens blank to the lens block. An edged lens-shaped cavity is provided in the ring member and provides for nearly full surface contact of an attachment alloy with a front surface of the lens blank to alleviate distortion. The two-piece lens block allows edged lens blanks to be surfaced to finished lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.