Assembly consisting of a complex transparency device and at least one array of micro-images, as well as a security document comprising same
US11148456B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 2018 |
| Grant date | Oct 19, 2021 |
| Priority date | — |
| Expiry date | Dec 13, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/08
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An assembly comprising a complex transparency device, i.e. a refractive and/or diffractive device acting on the light phase, and at least one array of micro-images, wherein: the complex transparency device comprises a periodical two-dimensional array formed from individual “pupils,” wherein each pupil comprises a micro-optical device, at least some of the micro-optical devices having a non-centered optical axis, and at least some of the micro-optical devices positioned non-periodically with variable off-setting of the optical axis thereof with the array; the array of micro-images comprising as many micro-images as micro-optical devices; each micro-image has a contour identical to that of the associated pupil and a surface which is at the most identical to that of the associate pupil; and each micro-image is sub-divided into at least one thumbnail image such that when the transparency device is positioned facing the array of micro-images, and an observer observes the array through the transparency device, the observer sees, at least in a given direction of observation, an image which is reconstructed by the combination of the thumbnail images associated with the direction, wherein w…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.