Diffractive security element

Details Diffractive security element Diffractive security element

2006-12-05

2006-12-05

Dye, Rena (Department: 1774)

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

C428S209000, C428S138000, C428S141000, C428S457000, C428S042100, C428S204000, C428S207000, C428S201000, C428S312800, C283S072000, C283S082000, C283S083000

Reexamination Certificate

active

07144617

ABSTRACT:
A security element (2) comprising a reflective, optically variable surface pattern (3) which is embedded in a layer composite of plastic material and which can be visually recognized from predetermined observation directions is formed from a mosaic of optically active surface elements (13). In the mosaic of the surface pattern (3) at least two of the mosaic surfaces (11; 12) of the surface pattern (3) are arranged substantially adjacent and have microscopically fine light-diffractive relief structures (4). The spatial frequencies of the relief structures in the mosaic surfaces (11; 12) are of values from predetermined spatial frequency ranges in such a way that, in the case of illumination beams which are incident obliquely relative to a normal onto the plane of the layer composite, the relief structures of the mosaic surfaces (11; 12) deflect visible monochromatic light parallel to the normal (32). The relief structures of the mosaic surfaces (11; 12) differ only in respect of spatial frequency, the difference in the spatial frequencies in the adjacent mosaic surfaces (11; 12) being at most 40 lines/mm.

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