Method for coating an ophthalmic lens within an injection molding machine
US7850879B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2006 |
| Grant date | Dec 14, 2010 |
| Priority date | — |
| Expiry date | Dec 21, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for in-mold coating of an injection molded thermoplastic lens that resides in an injection molding machine oriented to a horizontal parting line. An optical lens is initially formed by injecting molten thermoplastic resin into an edge-gated lens-forming cavity held closed under a primary clamp force. The mold is opened at a time when the lens is rigid enough to retain its shape. An unpressurized full metered charge of coating is applied onto the center of the lens. The coating is co-molded by ramping up the clamp force from zero to a secondary clamp force less than the primary clamp force to compress the coating into a uniformly thick, fringe-free layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.