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Diffractive device having a surface relief structure which generates two or more diffraction images and includes a series of tracks
Diffractive device having a surface relief structure which generates two or more diffraction images and includes a series of tracks
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机译:具有表面起伏结构的衍射装置,该表面起伏结构产生两个或更多个衍射图像并包括一系列轨迹
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摘要
A diffractive device has a surface relief structure which when illuminated by a light source, generates one or more diffraction effects which are observable from a range of viewing angles around the device. At least part of the surface relief structure is arranged in a series of tracks, each track being less than 0.25 mm in width. The device, which may be embossed onto a metallised foil, is suitable for use as an anti- forgery authentication element on valuable documents.
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