Plastic lens substrate and apparatus for and method of producing the same
US6276994A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1997 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Oct 8, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D11/00942
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A method of the production of a plastic lens substrate is provided which comprises the steps of retaining a starting plastic block material on a processing material retainer, holding a processing tool on a tool holder, the processing tool having a processing end portion dimensioned to be smaller than the dimension of the block material, manipulating the processing tool and/or the block material to thereby subject both of the same to relative movement, and repeating the steps mentioned upon exchange of the processing tool for one for use in subsequent processing. The method leads, in automated manner with improved production efficiency and increased cost saving, to a plastic lens substrate having a lens surface such as a spherical surface, a toric surface, an aspherical surface, a progressive surface, a combination of aspherical and toric surfaces or a combination of progressive and toric surfaces. Also disclosed is an apparatus for producing the lens substrate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.