Method of injection molding thin thermoplastic lenses
US7854865B2 · kind B2 · utility
3Cited by
77References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 8, 2005 |
| Grant date | Dec 21, 2010 |
| Priority date | — |
| Expiry date | May 16, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D11/00009
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Methods are disclosed to injection mold resins, like polycarbonate, to form solid optical lenses. The lenses are ideally suited for use as very thin coating carriers. The method involves closing the mold with a clamp force less than the force exerted on the insert during injection. During injection the mold is allowed to breathe thereby overcoming many of the obstacles associated with injection molding very thin lenses. As the injection pressure subsides, the mold begins to close to perform a coining operation, resulting in a strong, high yield carrier or lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.