Process for realization of an optically variable image
US5808776A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1996 |
| Grant date | Sep 15, 1998 |
| Priority date | — |
| Expiry date | Feb 15, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/2273
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Method for the production of an optically variable image including an animated element used as the model for the reproduction of a security element, by insolation of a light-sensitive material through two coherent light beams. The image is broken down into a plurality of elementary images, each corresponding to an optical effect defined by a color, the time when the image elements appear and their duration. A plurality of masks is provided, each including a number of windows defining an elementary image. Two light beams are used to light the entire substrate surface and the substrate is isolated by successively placing each mask on the substrate and in the path of the light beams. The first light beam is stationary while the second light beam is emitted from an illumination surface with adjustable dimensions and position, so as to produce a given optical effect for each elementary image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.