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Security element

A technology of security element and optical security device, applied in the field of security element

Inactive Publication Date: 2014-01-01
CCL SECURE PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] A further disadvantage of ZOD devices fabricated by known techniques is that they are limited to zeroth order gratings containing equally spaced linear grooves

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0075] refer to figure 1 , FIG. 2(A) and FIG. 2(B), a polarized security element 10 is shown. The security element 10 comprises a transparent or translucent substrate 20 to which is applied a first layer 30 of dielectric material having a refractive index nb. Embossed into the first layer 30 is a relief structure with grooves forming mutually parallel peaks 32 and valleys 33 . These peaks 32 have a width w which is smaller than a predetermined wavelength range. For operation of the security element in the visible region, the predetermined wavelength range will lie in the approximate range of 0.4 to 0.7 microns.

[0076] In FIG. 2(A), a series of grooves 31 of width w have been embossed into a suitable dielectric material 30, such as a radiation curable ink applied to the substrate 20, to form a Relief structure25. These grooves 31 may be embossed and cured substantially simultaneously. The high aspect ratio relief structure 25 of FIG. 2(A) has a groove depth order of 5 to...

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PUM

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Abstract

A polarising security element for polarising light of a predetermined wavelength is provided which includes a first dielectric material (30) having a refractive index nb, and at least one polarising region of mutually parallel segments (34) of a second material having a refractive index np which is different to nb, the second material being a dielectric or conducting material. The segments (34) of the second material are in contact with the first material (30) and the segments (34) have a width and / or an average spacing which is less than a predetermined range of wavelengths. A method of manufacturing such a security element is also provided in which a relief structure is embossed in the layer of the first dielectric material (30), the relief structure including a plurality of mutually parallel peaks and troughs (32,33), and the second layer of dielectric or conducting material is applied on the relief structure, preferably by printing, to form the at least one polarising region of mutually parallel segments (34).

Description

technical field [0001] The invention relates to a security element having an at least partial polarization effect and to a method for its manufacture. Background technique [0002] Security printers face the continuing challenge of staying ahead of counterfeiters who are increasingly gaining access to advanced reproduction techniques. For example, printing elements and diffractive relief structures commonly used as security features on banknotes can be affected by replication by optical scanning and contact replication, respectively. [0003] Designers of secure documents must therefore adopt increasingly advanced features in the technology to protect documents against forgery. One approach is to employ a combination of overt and implicit security features in the same area of ​​the security document. As the name implies, overt features are apparent to a human viewing the security document with the naked eye, while covert features become invisible under special lighting con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30G02B5/18B42D25/46B42D25/391
CPCB42D15/10B42D25/00B42D15/00G02B5/3058B42D25/328G02B5/18G02B5/1823G02B5/30G02B5/3041G09F3/03B42D25/391
Inventor 加里·费尔利斯·鲍尔菲·洛克罗伯特·亚瑟·李
Owner CCL SECURE PTY LTD