Patent ID: 6927885
Filing Date: 2005-08-09
Classification: G06K

Abstract:
1. A label comprising a layer composite with microscopically fine, optically active structures which are embedded between an embossing layer and a protective layer of the layer composite and which are covered with a reflection layer and which in a band-shaped area form at least one machine-readable diffractive bar code and which are arranged in the form of narrow rectangular fields with a first diffractive relief structure and intermediate surfaces separating the fields, wherein the first diffractive relief structure is formed from an additive superimposition of a first zero-order diffraction structure with a microscopically fine, light scattering relief structure, wherein the first zero-order diffraction structure has a spatial frequency of more than 2,300 lines per millimeter, a geometrical depth in the range of between 50 nm and 350 nm and a first grating vector which establishes a linear polarization capacity of the first zero-order diffraction structure, wherein the microscopically fine, light-scattering relief structure is a structure from the group which is formed from isotropically scattering matt structures, anisotropically scattering matt structures, kinoforms and Fourier holograms, so that the first diffractive relief structure diffracts and backscatters light into the half-space above the first diffractive relief structure, wherein the diffracted and backscattered light is linearly polarized in a plane predetermined by said grating vector, and wherein the microscopically fine, optically active structures differ at least with respect to the polarization capacity from the first diffractive relief structure.