Injection compression molding method and injection compression machine of lens
US7326375B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 28, 2002 |
| Grant date | Feb 5, 2008 |
| Priority date | — |
| Expiry date | May 27, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An injection compression molding method of a lens is provided, where a toggle link mechanism (65) is actuated to close a molding die (50) and a movable die plate (64) is moved to a position establishing a cavity thickness of greater than a thickness of an article to be molded while the die is closed. After injecting a molten resin into the cavity, the molten resin is sealed in the cavity and the toggle link mechanism (65) is actuated to advance the movable die plate (64) toward a fixed die plate (61), the relative position of a rear die plate (62) and the movable die plate (64) is made constant at a position where extension of a tie bar (63) becomes a predetermined value, and the molten resin is cooled for a predetermined time after completion of pressurizing the resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.