Optically variable surface pattern

Details Optically variable surface pattern Optically variable surface pattern

2005-12-13

2005-12-13

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Holographic system or element

Authentication

C283S902000

Reexamination Certificate

active

06975438

ABSTRACT:
An optically variable surface pattern (1) contains relief structures (9.1; 9.2; 9.3) for producing at least two representations (2; 3; 4). The relief structures (9.1; 9.2; 9.3) have a period length (L) of at least five micrometers and are sawtooth-shaped. The relief structures (9.1; 9.2; 9.3) associated with different representations (2; 3; 4) have different angles of inclination (α;β;γ). The angles of inclination are so selected that the representations (2; 3; 4) can be perceived separately by a viewer on the one hand and on the other hand when producing a copy by means of a color photocopier they are all transferred onto the copy.

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