Methods, devices, and systems for injection molding contact lenses
US9370906B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 8, 2011 |
| Grant date | Jun 21, 2016 |
| Priority date | — |
| Expiry date | Apr 10, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2011/0041
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Methods, devices, and systems for manufacturing ophthalmic lenses using direct injection molding are described. The present methods, devices, and systems include a mold block having a first mold insert and a second mold insert defining a lens-shaped cavity between them. A raised non-uniform region that projects into the lens-shaped cavity is incorporated in a peripheral zone of the molding surface of at least one of the mold inserts. When an ophthalmic lens is formed using the described mold block, at least one depression is produced in the lens. A gate placed at the non-uniform region allows the depression to hide any gate witness that may form when the mold is closed or separated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.