A lenticular optical system is described in which a composite image is viewable through a lens sheet from a first angle and an object or image placed at a preselected distance beneath the composite image is viewable from a second angle. Optical designs and alignment processes are disclosed which make...http://www.google.fr/patents/US6084713?utm_source=gb-gplus-shareBrevet US6084713 - Lenticular optical system
