Patent ID: 8488223
Filing Date: 2013-07-16
Classification: B41M,B42D,G02B,G03H

Abstract:
1. An optical security marking component producing a first configuration visible when observed through a polarizer oriented in a first orientation, and a second configuration separate from the first, visible when observed through a polarizer oriented in a second orientation, the optical component comprising: a stamped transparent film for forming at least two diffraction gratings having different orientations; and a reflecting coating coated on the stamped transparent film, the reflecting coating being at least one of metallic and transparent, wherein each of said gratings has a period of less than 550 nm, and a uniform modulation μ=h/d between 0.25 and 0.5 relative to a reference plane, wherein h is the groove height and d is the groove spacing, the stamped transparent film having a surface, said surface having a random and chaotic nature.