An optical authenticity feature

Details An optical authenticity feature An optical authenticity feature

B - Operations, Transporting

42

D

B42D 15/10 (2006.01) G03H 1/04 (2006.01) G07D 7/12 (2006.01) G09F 3/02 (2006.01)

Patent

CA 2310768

The invention relates to an optical authenticity feature for application onto any carriers, for example onto documents, and to a method for reading out the authenticity feature in accordance with the invention. With the aid of the security feature in accordance with the invention, a phase profile is modulated on a light ray incident to the security feature. The modulated phase profile can be transformed into amplitude information visible to the eye by means of, for example, the phase-contrast method, the schlieren method or an interferometer. The security feature can in particular comprise a hologram applied to the carrier, with a light ray incident to the hologram restoring an object ray having a modulated phase profile.

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