Diffractive safety element

Details Diffractive safety element Diffractive safety element

2005-08-02

2005-08-02

Assaf, Fayez G. (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S569000, C359S571000, C359S572000, C359S566000, C283S086000, C283S094000

Reexamination Certificate

active

06924934

ABSTRACT:
A security element (2) comprising a plastic laminate (1) has a surface pattern which is composed mosaic-like at least from surface elements, wherein in the surface elements a reflecting interface (8) between a shaping layer (5) and a protective layer (6) of the plastic laminate (1) forms optically effective structures (9). Light (11) which is incident on the plastic laminate (1) and which passes through a cover layer (4) of the plastic laminate (1) and through the shaping layer (5) is deflected in a predetermined manner by means of the optically effective structures (9). Shaped in the surface of at least one of the surface elements is a diffraction structure which is produced by a superimposition of a linear asymmetrical diffraction grating (24) with a matt structure. The linear asymmetrical diffraction grating (24) has a spatial frequency from the range of values of between 50 lines/mm and 2,000 lines/mm. The matt structure has a mean roughness value from the range of between 20 nm and 2,000 nm and at least in one direction a correlation length of between 200 nm and 50,000 nm.

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