Laser marking and/or ablation to create micro-imagery for micro-lens security features

摘要

#$%^&*AU2017101215B420180315.pdf#####Abstract A method of manufacturing a security device, including: providing a substrate having a first and a second side; applying an ablative coating on the first side of the substrate; directing laser light through a mask including laser light transmissive portions corresponding to a desired imagery pattern to be ablated from the ablative coating; focusing laser light transmitted though the mask via projection optics to form a focused mask image on the ablative coating, without passing through a first array of micro-lenses forming part of the security device, resulting in the removal of the ablative coating in a plurality of areas to create multiple patterns, each pattern being viewable at a particular viewing angle or range of angles through the first array of micro-lenses.