Polarizing lens for sunglasses
US9977264B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 19, 2013 |
| Grant date | May 22, 2018 |
| Priority date | — |
| Expiry date | Aug 19, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/305
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a polarizing lens that is excellent in terms of impact resistance, prevention of eye strain, and a small variation of color tone or transparency or both. A sunglass polarizing lens that is formed by laminating a transparent protective sheet via an adhesive layer to each surface of a polarizing film that is made from polyvinyl alcohol and that is stretched and stained with dichroic organic dye; curving the resultant laminate so as to impart spherical or aspherical surfaces thereto to obtain a polarizing sheet; and injecting a transparent resin for a lens onto a surface of the polarizing sheet, wherein the polarizing film is stained by combined dichroic organic dyes so that the dichroic ratio of the film is within the range of from 5 to 14.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.