RU94032168A - Information carrier - Google Patents

Abstract

FIELD: information carriers for identification or credit cards. SUBSTANCE: information carrier has at least three layers which are connected to one another. Middle and upper layers are made from opaque materials while lower layer is made from transparent or reflecting material. Said layers have reflecting diffraction patterns which direction, step and shape of lines conform to condition of concentration of half of light which enters pattern to spectrum of some non-zero order defined for this pattern. In addition it conforms to condition of coincidence of directions for diffraction light beams. Lower layer directs to red part of spectrum, middle layer to green, upper layer to blue part. Direction for diffraction light beams coincides with direction for verification of information carrier. This direction should be no more than 50 degrees with respect to plane of information carrier. Color identification picture has zebra-strip pattern and is generated by means of removal of material in some part of carrier down to depth of either upper or both upper and middle opaque layers using laser cut. Carrier handles either text or graphic pictures which are produced by means of removal of in some part of carrier down to depth of either upper or both upper and middle opaque layers using laser cut. EFFECT: increased protection. 2 cl, 3 dwg

Claims (1)

The invention relates to information carriers in which records of various types are used, moreover, one type of record is intended to identify the authenticity of the medium. The invention can be applied to identify, for example, identification or credit cards. The storage medium contains at least three layers connected to each other, of which the middle and upper layers are made of opaque materials, and the lower one is made of transparent or light-reflecting material. The layers contain reflective diffraction gratings, the directions, step and stroke profile of which are selected from a concentration of 50% of the light incident on the grating in the spectrum of some nonzero order specified for each grating, and also from the condition that the propagation directions of diffracted light for the grating of the lower layer coincide red, for the grating of the middle layer - in green, and for the grating of the upper layer - in the blue parts of the spectrum of a given nonzero order, the direction of diffused light propagation is the direction of an observation that identifies the authenticity of the image information medium and makes an angle of no more than 45 degrees with the plane of the medium, the color identification image has a raster structure and is formed by deleting in certain areas of the information medium the material to a depth of either only the upper or upper and middle opaque layers using the method laser engraving, the information placed on the medium has the form of text and graphic images formed by deleting in certain tkah information carrier material to a depth of the upper and middle opaque layers by means of laser engraving method. 1 p., 1 s p.f. 3 ill.