Reflective sheet
US11789185B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 2021 |
| Grant date | Oct 17, 2023 |
| Priority date | — |
| Expiry date | Jan 26, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/3041
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Provided is a reflective sheet that includes a reflective layer having a wide reflection wavelength range, excellent diffusion reflection properties, and inconspicuous defects. The reflective sheet includes a plurality of reflective layers that are laminated, the reflective layers being obtained by immobilizing a cholesteric liquid crystalline phase, in a cross-section of the reflective layer observed with a scanning electron microscope, at least a part of bright portions and dark portions derived from the cholesteric liquid crystalline phase has a flapping structure, a helical pitch in one or more reflective layers changes in a thickness direction, and a thickness of a reflective layer that is formed on a surface other than a surface of the reflective layer is less than those of other reflective layers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.