Optical information carrier
US6060143A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 18, 1998 |
| Grant date | May 9, 2000 |
| Priority date | — |
| Expiry date | May 18, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31678
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An optical information carrier is in the form of a composite laminate having a carrier foil. The underside and the top side of the carrier foil are provided with optically effective structures. The carrier foil is approximately transparent for light in a predetermined spectral range. The structures allow light impinging on the top side to penetrate at least partially into the composite laminate. The structures on the underside are microscopically fine relief structures which are covered with a base layer whose refractive index differs from the refractive index of the carrier foil in at least a portion of the electromagnetic spectrum so that the structures on the underside at least partially reflect and diffract the light which has penetrated into the composite laminate. The structures on the top side in turn modify the diffracted light. The interplay of the two structures provides manifold characteristic optical effects such as moire effects and light guide effects. It is also possible in that way to produce optical storage means, retroreflectors and other security features, being well protected from foreign access.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.