Optical laminate
US7354632B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2004 |
| Grant date | Apr 8, 2008 |
| Priority date | — |
| Expiry date | Apr 21, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31504
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Provided are: a long optical laminate prepared by laminating two obliquely stretched long phase-difference films so that the respective delayed-phase axes cross each other at a specified angle, while at least one of the two phase-difference films is a film containing residual volatile component by 1000 ppm or less; a long optical element prepared by laminating the optical laminate on one surface of polarization film; a long broad-band ¼ wavelength plate; an optical member prepared by laminating a circularly polarized light separating layer of cholesteric liquid crystal on one surface of the broad-band ¼ wavelength plate; a broad-band circular element using the broad-band ¼ wavelength plate; and an optical product having the broad-band circular polarization element. The invention provides long optical laminates having high optical characteristics stability, long broad-band ¼ wavelength plates, long optical elements, broad-band circular polarization elements, and various optical products having the broad-band circular polarization element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.