Diffraction surfaces and methods for the manufacture thereof

Details Diffraction surfaces and methods for the manufacture thereof Diffraction surfaces and methods for the manufacture thereof

G - Physics

02

B

G02B 5/18 (2006.01) G06K 7/10 (2006.01) G06K 19/06 (2006.01) G06K 19/16 (2006.01)

Patent

CA 2199037

A diffraction surface (100) and a method of making the surface. The surface (100) may be applied to labels and other items, to identify the origin of the goods to which the label is attached. The surface (100) can include a block grating. For example, the surface could include a plurality of blocks (350) which adapted when illuminated will produce a recognisable image on an intercepting surface. The diffraction grating is manufactured by processing a data stream indicative of the image. Processing of the data stream includes obtaining a Fourier Transform of the data stream. Preferably, the data stream is clipped and quantised.

On décrit une surface de diffraction (100) et un procédé permettant de la fabriquer. Cette surface (100) peut être appliquée sur des étiquettes et d'autres articles pour signaler l'origine des marchandises où l'étiquette est apposée. Cette surface (100) peut comporter un réseau de diffraction en blocs, un ensemble de blocs (350), par exemple, qui une fois adaptés en cas d'illumination, produisent une image reconnaissante sur une surface d'interception. On fabrique ce réseau de diffraction en traitant un flux de données correspondant à cette image, et notamment en obtenant une transformation de Fourier à partir de ce flux de données. Ce dernier est de préférence écrêté et quantifié.

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