Assembly consisting of a complex transparency device and at least one array of micro-images, as well as a security document comprising same

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 within the same subdivision, certain thumbnail images, form 'firsts group' and are distributed such that when the transparency device is positioned facing the array of micro-images, the thumb-nail images are respectively arranged according to the optical axis of the associated micro-optical device.