Optical component

Details Optical component Optical component

2006-08-07

2008-05-20

Shafer, Ricky D. (Department: 2872)

Optical: systems and elements

Polarization without modulation

Depolarization

C359S506000, C359S489040, C283S090000, C283S902000

Reexamination Certificate

active

07375888

ABSTRACT:
An optical component contains two or more hidden images for authentication and antiforgery purposes. The images are successively revealed and concealed when the optical component is held between two polarisers and one of them is rotated. The optical component comprises one or more optical retarder(s) in which the images are embedded in separate adjacent stripes or areas, each image being associated with a different mode of interaction with polarised light. Instead of two polarisers, one will suffice if the component is mounted on a reflector.

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