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Magnetically encoding thin-film material and fabrication method therefor

A technology of magnetic coding and thin film material, applied in the direction of magnetic films, magnetic layers, magnetic objects, etc., can solve the problems of being too simple and the detection signal does not have clear directional requirements, so as to reduce the thickness, eliminate the hidden dangers of environmental protection, and improve the anti-counterfeiting effect. Effect

Active Publication Date: 2009-03-25
CHINA BANKNOTE PRINTING & MINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the international application WO 00 / 05693 relates to an anti-theft label, which is composed of a 100-2000nm soft magnetic thin film multilayer film containing an amorphous state. A defect of this invention is that although the alloy composition is suitable for the application of the anti-theft label, However, it is too simple to apply to the field of high-end anti-counterfeiting securities, because there is no clear directional requirement for the detection signal

Method used

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  • Magnetically encoding thin-film material and fabrication method therefor
  • Magnetically encoding thin-film material and fabrication method therefor
  • Magnetically encoding thin-film material and fabrication method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Preparation of Seed Layer by Oil Mask Evaporation Deposition

[0058] The oil is heated to form oil vapor, which is sprayed on one side of the base layer 0 through a pre-designed microporous mask device to form a certain coding pattern. Then, utilize evaporation deposition equipment to carry out the preparation of seed layer (substrate layer), in deposition process, oil layer is evaporated, forms certain oil vapor area on the surface of oil layer, and the metallic element chromium of seed layer (substrate layer) 1a can only be deposited in the absence of In the area of ​​oil layer, in the area 1a' with oil layer, it cannot deposit and grow, forming a blank area, and finally forming a certain concave-convex coding pattern, such as figure 2 and 5 shown.

Embodiment 2

[0060] Preparation of seed layer by demetallization after deposition of metal layer

[0061] 1. Mask photolithography

[0062] First, a metal chromium layer is evaporated and deposited on one side of the base layer, and then a layer of photosensitive material is coated on the surface of the metal chromium layer. The photosensitive material is mainly composed of a photosensitive agent (such as: ammonium dichromate) and a colloid (such as: gum arabic, Polyvinyl alcohol), using optical exposure technology, the exposure source (such as: visible light, ultraviolet light) through the mask to project the coding pattern onto the photosensitive layer, and then through the development process, using water, anhydrous CaCl 2 , ZnCl 2 and lactic acid and other components to remove the residual glue, and then after baking, use various acid-base corrosion solutions (such as: hydrochloric acid, ferric chloride) or organic solutions to remove unnecessary part of the metal chromium, and finall...

Embodiment 3

[0066] Preparation of the seed layer by depositing a metal layer on top of a water-soluble coating

[0067] First, a layer of water-soluble ink layer 1d with a certain coding pattern is coated on the surface of the base layer, and then a layer of metal chromium layer 1f is deposited on the entire surface of the base layer (including the surface of the water-soluble ink layer). Figure 4 , and finally wash the base layer deposited with the metal chromium layer with water, remove the metal layer deposited on the water-soluble ink layer, and finally form a seed layer (substrate layer) 1a with a certain concave-convex coding pattern.

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Abstract

The invention relates to a compound anti-counterfeit thin-film material which is used for a paper currency, a marketable security, a certification and a card of a bill and a note, and similar carriers. The thin-film material is a novel magnetically encoded thin-film material, wherein a magnetically encode layer is formed by a metallic chromium layer provided with an encode pattern and a non-crystalline thin layer deposited on the metallic chromium layer, and the electromagnetic characteristics of an area equipped with the chromium layer and an area not equipped with the chromium layer have notable difference, thereby providing a 0-1 encoding scheme, and further improving the anti-counterfeit invisibility of the thin-film material. The invention further provides an compound anti-counterfeit article, which is formed by using the magnetically encoded thin-film material and has first, second and third anti-counterfeit characteristics.

Description

technical field [0001] The invention relates to a magnetic coding film material, in particular to a composite anti-counterfeiting film material which can be used for banknotes, valuable securities, ticket cards and similar bearing objects. The invention belongs to the field of anti-counterfeit material and anti-counterfeit technology. Background technique [0002] As we all know, adding security threads or special anti-counterfeiting additives of various shapes and anti-counterfeiting labels in or on the surface of anti-counterfeiting paper or anti-counterfeiting plastic polymers such as banknotes, securities or bills can increase the difficulty of counterfeiting. In the form of strips or specially shaped sheets, they are added to the anti-counterfeit paper or plastic polymer during the manufacturing process, and can also be adhered to the surface of the anti-counterfeit paper or anti-counterfeit plastic polymer in the later stage of production. These anti-counterfeiting ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F10/13G09F3/02
CPCH01F10/265H01F10/13
Inventor 李晓伟曹瑜杨惊李新宇曾飞潘峰
Owner CHINA BANKNOTE PRINTING & MINTING
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