Document

Details Document Document

B - Operations, Transporting

42

D

283/20

B42D 15/00 (2006.01) B42D 15/10 (2006.01) D21H 21/48 (2006.01)

Patent

CA 1336779

A document (1) is provided with a macroscopic structure (7) which is difficult to forge embossed into a substrate (3), said structure (7) being provided with an optically acting covering (4) and being protected beneath a protective cover (5). The structure (7) consists of several surface portions (8, 9, 10) which are defined by a microscopic relief structure (12, 12') and are different from each other under visual observation as a result of optical diffraction effects. Several of the surface portions (8, 9) measure less than .3 mm and can occur individually or in a row in the structure (7), whereby the distances between the surface portions (8, 9) measure less than .3 mm. The document (1) shows a pattern consisting of a mesh of dots and lines to the naked eye. An examiner viewing the document (1) through a magnifying glass will see the dots and the lines dissolve into characters, numbers and other graphic features. A device to produce a master structure for the shaping of a stamp used to emboss the document (1) is described here.

591661

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