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Improvements in printed security features

A security feature and security technology, applied in printing, printed matter, printing technology, etc.

Inactive Publication Date: 2011-09-14
DE LA RUE INT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem facing security printers is how to produce high resolution images in combination with printing processes or inks that are inherently only capable of producing low resolution images

Method used

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  • Improvements in printed security features
  • Improvements in printed security features

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Experimental program
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Effect test

Embodiment Construction

[0035] In its broadest sense, the invention is a security feature comprising a high resolution first image on a substrate, on top of which is printed a second image having a low resolution efficiency, and preferably have optical, tactile or other effects. The images are superimposed, and only the shape of the high resolution image is readily discernible when viewed in transmitted and / or reflected light, not the shape of the low resolution image. This may be due to the relative positioning and shape of the two images such that the second image does not extend beyond the boundaries of the first image, and / or to the composition of the ink forming the second image. The optical properties of the two images can be adjusted to give low contrast in at least one viewing mode, ie in transmission or reflection. Thus, any favorable optical, tactile, or other properties of the low-resolution image do not impair the perceived resolution of the overall image by the viewer.

[0036] The sec...

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Abstract

The invention relates to improvements in security features which comprise at least one printed image and, in particular, to such security features which provide an improvement in the resolution of printed images forming security features using inks, pigments or printing processes which do not lend themselves to the production of sharply defined or high resolution images. The security feature comprises an opague first image and a second image at least partially overlying the first image, the second image being a printed image which has a lower visual resolution than the first image. The formation of the second image is such that, when the security feature is viewed in transmitted and / or reflected light, only the shape of the first image is readily discernable.

Description

technical field [0001] The present invention relates to improvements in security features comprising at least one printed image and, in particular, to security features which are sensitive to the use of inks, pigments or unsuitable for the production of clear or high-resolution images. The printing process provides an improvement in the resolution of the printed image forming the security feature. Background technique [0002] Printed security features on security documents often require or benefit from high resolution printing. For example, micro prints, often used on security documents, make it difficult for counterfeiters to reproduce, but this is only possible if the print has sufficient resolution. In the case where the printing is on a transparent or translucent substrate, the image can be seen in transmission and can interact with the image on the opposite side of the document, eg creating a moiré interference pattern. In such cases, high-resolution images produce b...

Claims

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Application Information

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IPC IPC(8): B41M3/14B42D15/00
CPCB42D2033/10B41M3/148B42D2033/26B42D2035/20B42D15/0013B42D2033/20B42D15/0026B42D25/355B42D25/29B42D2031/06B42D25/351
Inventor S·D·玛钱特P·豪兰
Owner DE LA RUE INT LTD
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