Method of producing a polarized lens and a casting die used in the same
US7175785B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Oct 2, 2003 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Nov 27, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/0034
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method of producing a polarized lens and a casting die used therein are provided to allow a polarized film to be securely positioned within a casting die and a polarized lens to be cast in a uniform density and be almost free from any distortion on the surface so as to secure the stable uniformity of a lens as produced, which method comprises the steps of hot-pressing a polarized film 2 that is formed into a shape substantially corresponding to one of mobile portions 12 into a curved shape adaptable into a curvature of the lens; descending one of mobile portions 12 so as to generate a recess H thereat; mounting the polarized film 2 as shaped with the curvature into the recess H and closing a casting die 1; injecting a fused lens molding resin M into a cavity within the casting die 1 from a gate 13 with the lens molding resin M filled in a runner 13a engaged to the casting die 1; and taking out a prototype lens Lb in which the lens molding resin M is integrally jointed with the polarized film 2 when the molding resin M is cured.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.