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Diffractive security element comprising a half-tone picture

A security element and halftone technology, which is applied in the direction of optical elements, printing and printing of special varieties of printed matter, and can solve the problems of difficult imitation and so on.

Inactive Publication Date: 2006-12-06
OVD KINEGRAM AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Such security elements can be used to authenticate documents, banknotes, passports and ID cards, various valuables, etc. Although they are easy to verify, they are difficult to imitate

Method used

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  • Diffractive security element comprising a half-tone picture
  • Diffractive security element comprising a half-tone picture
  • Diffractive security element comprising a half-tone picture

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0023] In Fig. 1, reference numeral 1 denotes a diffractive security element, reference numeral 2 denotes a halftone image of a pattern element, reference numeral 3 denotes a large portion of the security element 1, reference numeral 4 denotes a pixel, reference numeral 5 denotes a background area, and reference numeral 4 denotes a pixel. 6 represents a pixel pattern. The pattern elements of the halftone image 2 are picture elements 4 like pixels, which constitute a mosaic of surface parts. The fine surface structure in the surface portion of the picture element 4 modulates the light incident on the security element 1 depending on the illumination and viewing direction. The surface portion with the light conditioning surface structure includes at least a background area 5 and a pattern of pixels 6 . The surface structure may have a reflective layer to enhance the light conditioning effect.

[0024] In FIG. 1 , the surface of the security element 1 is oriented with respect to...

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PUM

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Abstract

The invention concerns a diffractive security element (1) comprising a half-tone picture (2), consisting of diffracting structures which are located in a reflective layer (13) incorporated in a plurality of layers (10), between a transparent embossing layer (11) and a protective coating layer (12). The half-tone picture (2) is divided into picture elements (4) having at least a dimension less than 1 mm. The surface of each picture element (4) comprises a background zone (5) and a pattern picture element (6). The surface occupied by the picture element pattern (6) with respect to the total surface of the picture element (4) determines the brightness of the half-tone picture (2) in one point (P) of the picture element (4). The background zone (5) comprises a first diffracting structure which does not modify the light in the same way as the picture element pattern (6). Pattern strips (36), having a width up to 0.3 mm, can further extend over the surface of the half-tone picture (2). Said pattern strips (36) occupy a small portion of the surface of the background zone (5) and / or of the picture element patterns (6) and form coloured strips (43) on the half-tone picture (2).

Description

technical field [0001] The invention relates to a diffractive security element with a halftone image, which is set forth in the classification part of claim 1 . Background technique [0002] Such security elements can be used to authenticate documents, banknotes, passports and ID cards, various valuables, etc. Although they are easy to verify, they are difficult to imitate. Typically, such security elements are secured to the item to be authenticated with an adhesive. [0003] From EP-A 0 105 099 a security pattern of graphic structure is known which forms diffractive image elements like a mosaic pattern. A change in the appearance of the security pattern can be seen when the security pattern is tilted and / or rotated in its plane. [0004] EP-A 0 330 738 describes a security pattern with diffractive surface portions smaller than 0.3 mm and arranged individually or in rows in the structure of the security pattern. In particular, the surface portion forms text characters wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B42D15/10G02B5/32B42D15/00
CPCB42D25/29B42D15/0013B42D25/328B41M3/14B42D15/0066B42D25/23
Inventor A·希林W·R·汤普金
Owner OVD KINEGRAM AG