Wavelength selective coatings for optical disc security
US7269123B2 · kind B2 · utility
6Cited by
4References
38Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2005 |
| Grant date | Sep 11, 2007 |
| Priority date | — |
| Expiry date | Feb 6, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/282
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical disc for data storage includes a layer of color-shifting material. Light passing through the color-shifting layer will have a color determined by the various constructive and destructive interference of the various wavelengths after they have passed through the material, diffracted while passing through the material, and are reflected off of various portions of the material, resulting in a color change when the viewing angle is changed. Additionally, an optical variable device may be defined within the disc, and may include the color-shifting layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.