Interference security image structure
US8064632B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 2007 |
| Grant date | Nov 22, 2011 |
| Priority date | — |
| Expiry date | Jan 7, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/285
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An interference filter having a plurality of layers and a spectrum as a function of angle of observation is combined with a metameric element adjacent the interference filter and appearing to have a same color as the interference filter at at least one angle of observation and a contrasting color as said interference filter at least one other angle of observation. A plurality of interference filter layers, including a metallic layer, can be provided on a support structure for the layers. The support structure is then adapted to allow the layers to be seen from a top and a bottom side, with the layers being adapted to have different spectra as a function of angle of observation in reflection and transmission.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.