Apparatus and method for injection molding lenses
US4540534A · kind A · utility
89Cited by
13References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 11, 1983 |
| Grant date | Sep 10, 1985 |
| Priority date | — |
| Expiry date | Oct 11, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus and method for molding polycarbonate lenses is disclosed in which the lenses are formed in a single injection molding operation. Polycarbonate is injected into a cavity between two movable dies which are forced apart by the injected polycarbonate. These dies are then urged together forcing a portion of the injected polycarbonate back through the same port through which the polycarbonate was injected. The finished lens does not have the knit line normally associated with injection molded lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.