Diffractive surface pattern
US6417968B1 · kind B1 · utility
Inventors
Key dates
| Filing date | Jul 27, 2000 |
| Grant date | Jul 9, 2002 |
| Priority date | — |
| Expiry date | Jul 27, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/16
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A surface pattern is made up of surface elements (1 to 7) which are arranged in a mosaic-like fashion and which have microscopic relief structures. The surface elements (2 to 6) which are divided at least into first and second surface portions (8; 9) have in the first and second surface portions (8; 9) asymmetrical diffraction gratings (12; 13) with an optical diffraction effect, wherein in each divided surface element (2 to 6) adjacent first surface portions (8) are separated by at least one second surface portion (9). The grating vectors of the asymmetrical diffraction gratings (12) of the first surface portions (8) of all divided surface elements (2 to 6) have the same first value in respect of azimuth and the asymmetrical diffraction gratings (13) of the second surface portions (9) of all divided surface elements (2 to 6) have the same second value in respect of azimuth. The divided surface elements (2 to 6) are arranged in accordance with their surface proportion value AN in the mosaic of all surface elements (1 to 7). The surface proportion value AN of the N-th divided surface element is the relationship of the sum of all first surface portions (8) to the total area of all fi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.