Colored polarizing films, colored polarizing sheets, and colored polarizing lenses, and methods thereof
US9897823B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 19, 2013 |
| Grant date | Feb 20, 2018 |
| Priority date | — |
| Expiry date | Aug 19, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T156/1002
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A polarizing film is produced by swelling a polyvinyl alcohol film with water, uniaxially stretching it, dyeing it with an organic dichroic dye, and drying it, wherein a dichroic organic dye composition includes a combination of organic dyes having a dichroic ratio of 13 or higher used in an amount to keep the degree of polarization at 90% or more, and wherein the coloration dye composition comprises a combination of dyes having extremely low dichroic ratios of 4 or less or substantially having no dichroic ratio, laminating at least one layer of a transparent plastic sheet onto at least both sides of the polarizing film, curving the polarizing sheet so as to impart spherical or aspherical surfaces thereto to obtain a polarizing and injecting a transparent resin to the concave surface of the curved polarizing sheet to obtain an injection polarizing lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.