Optically variable element and the use thereof
US7551335B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2003 |
| Grant date | Jun 23, 2009 |
| Priority date | — |
| Expiry date | Apr 27, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42D25/328
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The invention relates to an optically variable element which at least in surface portions has an interface embedded between two layers and which forms an optically effective structure, that interface having a free-form surface which appears three-dimensionally for a viewer. To emphasise that free-form surface the invention provides that the free-form surface is formed by a partial region of the interface, which is of a lens-like configuration and which produces a magnification, reduction or distortion effect. The invention also provides the use of such optically variable elements as a security element to prevent forgery of value-bearing documents or for articles to be safeguarded, in particular as part of the decorative layer arrangement of a transfer or laminating film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.