Optical security marking component, method of manufacturing such a component, system comprising such a component, and reader for checking such a component
US8488223B2 · kind B2 · utility
0Cited by
2References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 2, 2007 |
| Grant date | Jul 16, 2013 |
| Priority date | — |
| Expiry date | Feb 4, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/2276
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to an optical security marking component producing a first visible configuration when observed through a polarizer oriented in a first orientation, and a second configuration, separate from the first, visible when observed through the polarizer oriented in a second orientation, the optical component comprising a stamped film for forming at least two diffraction gratings having different orientations, characterized in that each of said gratings has a period of less than 550 nm and a modulation between 0.25 and 0.5 relative to a reference plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.