Diffractive device for generating one or more diffracting images including a surface relief structure at least partly arranged in a series of tracks
US5825547A · kind A · utility
18Cited by
11References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1996 |
| Grant date | Oct 20, 1998 |
| Priority date | — |
| Expiry date | Feb 5, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/328
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A diffractive device having a surface relief structure which, when illuminated by a light source, generates one or more diffraction images which are observable from particular ranges of viewing angles around the device, wherein at least part of the surface relief structure (1) is arranged in a series of tracks (2), each track (4, 5) having a diffracting surface (3) which generates a component of a diffraction image, such that at least one of the diffraction images generated by the diffractive device is formed from image components generated by a plurality of the tracks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.