Discrimination medium and discrimination method using the same
US7391546B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 2004 |
| Grant date | Jun 24, 2008 |
| Priority date | — |
| Expiry date | Nov 13, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2250/38
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A discrimination medium 10a includes a first double layered body 101 having a right-handed circular polarization polymer cholesteric liquid crystal layer 11 and a left-handed circular polarization polymer cholesteric liquid crystal layer 12 which are stacked. The right-handed circular polarization polymer cholesteric liquid crystal layer 11 reflects a specific right-handed circular polarization light, and the left-handed circular polarization polymer cholesteric liquid crystal layer 12 reflects a specific left-handed circular polarization light. The discrimination medium 10a is applied to the article 30, and is viewed via a simple determination tool 20 having a filter 21 allowing only right-handed circular polarization light to pass therethough and a filter 22 allowing only left-handed circular polarization light to pass therethough. As a result, the color of the right-handed circular polarization polymer cholesteric liquid crystal layer 11 is seen via the right-handed circular polarization light filter 21, and the color of the left-handed circular polarization polymer cholesteric liquid crystal layer 12 is seen via the right-handed circular polarization light filter 22. This uniqu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.