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PhotoallergicPhototropic anti-fake element for protectingeventing valuable object

A technology for optically changing anti-counterfeiting and valuable items, applied in optics, printed matter, nonlinear optics, etc., to enrich anti-counterfeiting features and avoid forgery and imitation

Active Publication Date: 2011-01-05
CHINA BANKNOTE SECURITY PRINTING TECH RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Moreover, the continuous upgrade of the current forgery methods has also put forward new requirements and challenges for the optical variable anti-counterfeiting technology. The optical variable technology must be upgraded from the "one-dimensional" simple color-changing feature in order to curb the ever-expanding threat of counterfeiting

Method used

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  • PhotoallergicPhototropic anti-fake element for protectingeventing valuable object
  • PhotoallergicPhototropic anti-fake element for protectingeventing valuable object
  • PhotoallergicPhototropic anti-fake element for protectingeventing valuable object

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Form the first liquid crystal alignment layer 22 and the first nematic liquid crystal layer 23 on the surface of the substrate 21 according to the method described in US6734936, wherein, the first liquid crystal alignment layer 22 induces alignment through linearly polarized ultraviolet light in different directions, the first The molecules of the nematic liquid crystal layer 23 are aligned according to the arrangement of the first liquid crystal alignment layer 22, forming a corresponding alignment structure;

[0084] Prepare the cholesteric liquid crystal prepolymer solution with different mass percentages of chiral substances to form successively the first cholesteric liquid crystal layer 24, the local second cholesteric liquid crystal layer 25 and The third local cholesteric liquid crystal layer 26 makes the angle-dependent discoloration law of the first cholesteric liquid crystal layer 24 (that is, changes from the vertical angle to the oblique angle with the viewin...

Embodiment 2

[0092] Form the first liquid crystal alignment layer 22 and the first nematic liquid crystal layer 23 on the surface of the substrate 21 in the same manner as in Example 1, and the other side surface of the substrate 21 forms a local dealuminated layer (a partially hollowed out metal layer) 28;

[0093] Prepare cholesteric liquid crystal prepolymer solutions with different concentrations of chiral substances to form the first cholesteric liquid crystal layer 24, the second cholesteric liquid crystal layer 25 and the third cholesteric liquid crystal layer 26 in sequence, wherein the first cholesteric liquid crystal The angle-dependent color change law of the layer 24 is green-blue, the angle-dependent color change law of the second cholesteric liquid crystal layer 25 is infrared-red, and the angle-dependent color change law of the third cholesteric liquid crystal layer 26 is purple-ultraviolet;

[0094] Form a dark background layer 27 by printing with dark magnetic ink to obtai...

Embodiment 3

[0101] In the optically variable anti-counterfeiting element provided in this embodiment, the first liquid crystal alignment layer 22 partially exists in the element in the form of a pattern, and the first liquid crystal alignment layer 22 is unidirectionally aligned with linearly polarized ultraviolet light, and the others are the same as in Embodiment 1;

[0102] The dark infrared ink 1 which absorbs electromagnetic waves with a wavelength of 800nm ​​and reflects electromagnetic waves with a wavelength of 1300nm and the dark infrared ink 2 which absorbs electromagnetic waves with a wavelength of 1300nm and reflects electromagnetic waves with a wavelength of 800nm ​​are overprinted in the form of patterns corresponding to positive and negative characters Form a dark background layer 27 .

[0103] In addition to the optically variable anti-counterfeiting element provided in this embodiment, which has the angle-dependent discoloration and angle-dependent pattern change character...

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PUM

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Abstract

The invention relates to a photoallergichototropic anti-fake element for protectingeventing a valuable object, at least provided with a first liquid crystal orientation layer, a first nematic liquid crystal layer, a first cholesteric liquid crystal layer, a second cholesteric liquid crystal layer and a dark background layer. The photoallergichototropic anti-fake element has the visually identifiable angle-dependantular allochroic characteristic, the visually identifiable angle-dependantular pattern change characteristic and the identifiable hidden patterns characteristic under a polaroid sheet, combines a plurality of photoallergicphototropic anti-fake characteristics in the same photoallergicphototropic anti-fake element and provides the phototropicphototropi anti-fake element which is easy for the mass to identify and hard to forge. The invention also relates to the valuable object provided with the phototropiphototropic anti-fake element.

Description

technical field [0001] The invention relates to an optically variable anti-counterfeit element for protecting valuable articles, in particular to an optically variable anti-counterfeit element integrating multiple optically variable anti-counterfeit features. Background technique [0002] Due to the continuous popularization of color copiers and imaging systems and the continuous improvement of printing technology, the phenomenon of counterfeiting banknotes, passports and ID cards has increased. For the purpose of preventing counterfeiting and counterfeiting, items of value such as certificates, securities and branded products are often provided with security elements in order to verify the authenticity of the item of value and at the same time prevent unauthorized copying. [0003] Optical variable technology is an effective means to prevent counterfeiting methods such as copying and scanning. On the one hand, the imaging system records the scattered light information on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1347G02F1/1337G02F1/139B42D15/10B42D25/355B42D25/364
Inventor 周基炜柯光明王斌刘卫东黄小义魏先印
Owner CHINA BANKNOTE SECURITY PRINTING TECH RES INST CO LTD
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