Multi-layer body with volume hologram
US8187771B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2007 |
| Grant date | May 29, 2012 |
| Priority date | — |
| Expiry date | Feb 11, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/2635
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Described is a process for the production of a multi-layer body having a volume hologram with at least two different items of image information, wherein a photosensitive layer (46) of the multi-layer body is directly or with the interposition of a transparent optical medium (44s, 45) brought into contact with the front side of a master (44), in which interlaced regions with different asymmetrical surface structures or kinoform structures are shaped, which embody the at least two different items of image information. The photosensitive layer (46) and the master are exposed with a coherent light beam (47) whereby a volume hologram is formed in the photosensitive layer (46). Also described are a master for the production of the multi-layer body and a security element having said multi-layer body.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.