Composite plastic lens and method of making the same
US4892403A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 19, 1988 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | Aug 19, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The composite plastic lens includes an anterior plastic lens having a first corrective feature and a posterior plastic lens having a second corrective feature. The anterior and posterior lenses are joined together by an adhesive that bonds opposing, etched surfaces of those lenses. The method of making the composite plastic lens includes, in one embodiment, the steps of etching the front and rear surfaces of the posterior and anterior lenses and bonding those etched surfaces together with an adhesive. Another method of making the composite plastic lens includes heating the lenses prior to bonding them together for a time such that the posterior and anterior lenses return to their original shape and curvature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.