Security element with diffraction structures

Details Security element with diffraction structures Security element with diffraction structures

2005-06-21

2005-06-21

Assaf, Fayez G. (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S573000, C359S567000, C359S566000, C283S086000

Reexamination Certificate

active

06909547

ABSTRACT:
A security element (2) comprising a plastic laminate has a surface pattern (12) composed mosaic-like from surface elements (13; 14; 15). Shaped into at least two of the surface elements (14; 15) is a respective diffraction structure {B(x, y, T)} produced from a superimposition of a low-frequency grating structure {G(x, y)} with a high-frequency relief structure {R(x, y)}. In the one surface element (14) a grating vector of the grating structure {G(x, y)} and a relief vector of the relief structure {R(x, y)} are parallel and in the other surface element (15) the grating vector (16) and the relief vector (17) include a substantially right angle. In addition the grating vectors (16) of the grating structures {G(x, y)} in the two surface elements (14; 15) are parallel. A common boundary (18) of the two surface elements (14; 15) is visible only upon lighting with linearly polarized light, in daylight both surface elements (14; 15) have the same surface brightness.

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