阅读说明：本技术 一种基于随机点阵层的复合防伪结构及其制备方法和应用 (Composite anti-counterfeiting structure based on random lattice layer and preparation method and application thereof ) 是由 谢志梅 黄鹏 董小春 姜世平 王德麾 于 2019-09-24 设计创作，主要内容包括：本发明提供一种基于随机点阵层的复合防伪结构,属于防伪技术领域。所述复合防伪结构由至少两层带有随机点阵的透明材料层依次重叠复合而成,且透明材料层上的随机点阵是通过对第一层透明材料层上随机点阵进行坐标变换而产生的相关联点阵。本发明还提供复合防伪结构的制备方法和应用。本发明的复合防伪结构可以产生多种莫尔图案,且该图案并不能被各层点阵单独显示,具有较高的设计难度与视觉吸引力,同时相对于现有的防伪图形,具有鲜明的特点,可用于商品包装和防伪领域。(The invention provides a composite anti-counterfeiting structure based on a random dot matrix layer, and belongs to the technical field of anti-counterfeiting. The composite anti-counterfeiting structure is formed by sequentially overlapping and compounding at least two layers of transparent material layers with random lattices, and the random lattices on the transparent material layers are associated lattices generated by carrying out coordinate transformation on the random lattices on the first layer of transparent material layer. The invention also provides a preparation method and application of the composite anti-counterfeiting structure. The composite anti-counterfeiting structure can generate various Moire patterns, the patterns cannot be independently displayed by each layer of dot matrix, the design difficulty and the visual attraction are higher, and compared with the existing anti-counterfeiting patterns, the composite anti-counterfeiting structure has the characteristic of vividness and can be used in the fields of commodity packaging and anti-counterfeiting.)

1. The composite anti-counterfeiting structure based on the random dot matrix layer is characterized in that the composite anti-counterfeiting structure is formed by sequentially overlapping and compounding at least two transparent material layers with random dot matrixes, and the random dot matrixes on the transparent material layers are associated dot matrixes generated by carrying out coordinate transformation on the random dot matrixes on the first transparent material layer.

2. The composite anti-counterfeiting structure based on the random lattice layer according to claim 1, wherein the dots forming the lattice are the same in size, and the diameter of the dots is 100-500 μm.

3. A composite security feature based on random lattice layers as claimed in claim 1 wherein the coordinate transformation is a rotation, scaling or geometric transformation.

4. The composite anti-counterfeiting structure based on the random lattice layer as claimed in claim 1, wherein the points constituting the lattice are opaque at positions, and are transparent at other positions, and the ratio of the total area of the opaque points to the total area of the transparent positions is less than 1: 3.

5. a composite security structure based on a random lattice layer according to claim 1, wherein the transparent material is a transparent film or glass, preferably a transparent organic film, PMMA or soda glass.

6. The composite anti-counterfeiting structure based on the random dot matrix layer according to claim 5, wherein the random dot matrix is manufactured on the surface of the transparent film in an ink-jet printing, UV imprinting or screen printing mode; manufacturing the PMMA by a laser processing method; the glass is made on soda glass by means of chemical corrosion.

7. The composite security structure of claim 1, wherein the composite security structure is formed by overlapping two transparent material layers with random lattices, and the random lattices on the second transparent material layer are associated lattices generated by performing coordinate transformation on the random lattices on the first transparent material layer.

8. The composite anti-counterfeiting structure based on the random lattice layer according to claim 1, wherein the dots of the random lattice are all positioned in a rectangle, and the number of the dots is n<(L×W)/πD²And L and W represent the length and width of the rectangle, respectively.

9. A method for preparing a composite security structure based on a random lattice layer as claimed in any one of claims 1 to 8, comprising the steps of:

1) randomly generating a series of points to form a dot matrix A1, and arranging a hollow cross on the edge of the dot matrix A1 for alignment;

2) copying a dot matrix A1, and carrying out coordinate transformation on the dot matrix A1 to obtain a new random dot matrix A2, wherein a solid cross is arranged on the edge of the dot matrix A2, and the position of the solid cross corresponds to the position of an open cross on the edge of the dot matrix A1;

3) repeating the step 2) to copy the dot matrix A1 according to the number of layers of the transparent material, and carrying out coordinate transformation on the dot matrix A1 until each layer of the transparent material layer has a corresponding array An, and arranging a solid cross on the edge of each layer of the dot matrix An, wherein the position of the solid cross corresponds to the hollow cross on the edge of the dot matrix A1;

4) respectively manufacturing random lattices A1, A2 and … An on the transparent material layer;

5) and overlapping the transparent material layers printed with the dot matrixes A1, A2 and … An in sequence, and enabling the solid cross characters of the dot matrixes of each layer to be superposed with the hollow cross characters of the dot matrix A1 of the first layer, so that the composite anti-counterfeiting structure can be obtained.

10. The use of a composite security structure based on random lattice layers as claimed in any one of claims 1 to 8, wherein the security structure is used in commodity packaging and security labels.

Technical Field

The invention belongs to the technical field of anti-counterfeiting, and particularly relates to a composite anti-counterfeiting structure based on a random dot matrix layer, and a preparation method and application thereof.

Background

Nowadays, anti-counterfeiting technologies based on thin films are more and more favored by markets, such as rainbow holography, micro-lens array anti-counterfeiting and the like. The preparation of the rainbow holographic film depends on nano-scale micro-nano processing technology, the preparation condition is strict, and the cost is higher. The microlens array and the micro-graphic array need to be simultaneously prepared by the microlens array anti-counterfeiting film, so that the preparation process, the cost and the preparation period are increased, and the forming technology of the microlens array with the controllable surface shape is often a technical problem in the field of micro-nano processing.

Historically, moire patterns visible to the naked eye have been studied extensively. When two gratings with slightly different spatial frequencies are overlapped, the difference frequency component forms a fringe called a moire fringe, and when the two gratings have relative movement, the moire fringe moves along with the relative movement. Moire fringes have become an optical anti-counterfeiting technique and are reported in many articles. However, many moire patterns are limited to the stripe patterns formed by the grating, the design is simple, the pattern moving mode is single, and the moire patterns are greatly limited in practical application. In addition, many existing anti-counterfeiting technologies, such as laser holography, watermarks, two-dimensional codes and the like, have failed to achieve good anti-counterfeiting effects due to high preparation cost, single display effect or mature technology, and are easily imitated by lawbreakers. In later research, foreign researchers have demonstrated that not only periodic gratings but also random lattices can produce moire patterns through more in-depth analysis of moire patterns. When two similar lattices approach and interfere in a certain way, a certain pattern of moire is produced.

Disclosure of Invention

The invention aims to provide a composite anti-counterfeiting structure based on a random dot matrix layer, and the pattern generated by the anti-counterfeiting structure has strong visual attraction, has the characteristic of vividness compared with the existing anti-counterfeiting pattern, and can be used in the fields of commodity packaging and anti-counterfeiting.

The purpose of the invention is realized by the following technical scheme:

the composite anti-counterfeiting structure is formed by sequentially overlapping and compounding at least two transparent material layers with random lattices, and the random lattices on the transparent material layers are associated lattices generated by carrying out coordinate transformation on the random lattices on the first transparent material layer.

Fig. 1 and fig. 2 show the composite anti-counterfeiting structure of the present invention, wherein fig. 1 is a three-dimensional structure diagram of two layers of random dot matrix layers, and fig. 2 is a three-dimensional structure diagram of multiple layers of random dot matrix layers. The composite anti-counterfeiting structure is a two-layer or multi-layer associated random lattice layer structure obtained by carrying out coordinate transformation on other layers of lattices on the basis of a random lattice layer on a first layer of transparent material, and the coordinate transformation of each layer can be the same or different.

Furthermore, the dot sizes of the composition dot matrix are the same, and the dot diameters are 100-500 mu m.

Further, the coordinate transformation is a rotation, scaling or geometric transformation. The specific coordinate transformation, rotation, scaling or geometric transformation can be realized according to the conventional means in the field as long as the purpose of the coordinate transformation of the lattice layer can be realized, and the specific implementation mode is not limited.

Furthermore, the positions of the points forming the lattice are opaque, other positions are transparent, and the ratio of the total area of the opaque points to the total area of the transparent positions is less than 1: 3.

further, the transparent material is a transparent film or glass, preferably a transparent organic film, PMMA or soda glass.

Further, the random dot matrix is manufactured on the surface of the transparent film in an ink-jet printing, UV imprinting or screen printing mode; manufacturing the PMMA by a laser processing method; the glass is made on soda glass by means of chemical corrosion.

Furthermore, the composite anti-counterfeiting structure is formed by overlapping and compounding two layers of transparent material layers with random lattices, and the random lattices on the second layer of transparent material layer are associated lattices generated by carrying out coordinate transformation on the random lattices on the first layer of transparent material layer.

Furthermore, the points of the random dot matrix are all positioned in the rectangle, and the number of the points is n<(L×W)/πD²And L, W, D denote rectangles respectivelyLength and width and spot diameter.

A preparation method of a composite anti-counterfeiting structure based on a random lattice layer comprises the following steps:

1) randomly generating a series of points to form a dot matrix A1, and arranging a hollow cross on the edge of the dot matrix A1 for alignment;

2) copying a dot matrix A1, and carrying out coordinate transformation on the dot matrix A1 to obtain a new random dot matrix A2, wherein a solid cross is arranged on the edge of the dot matrix A2, and the position of the solid cross corresponds to the position of an open cross on the edge of the dot matrix A1;

3) repeating the step 2) to copy the dot matrix A1 according to the number of layers of the transparent material, and carrying out coordinate transformation on the dot matrix A1 until each layer of the transparent material layer has a corresponding array An, and arranging a solid cross on the edge of each layer of the dot matrix An, wherein the position of the solid cross corresponds to the hollow cross on the edge of the dot matrix A1;

4) respectively manufacturing random lattices A1, A2 and … An on the transparent material layer;

5) and overlapping the transparent material layers printed with the dot matrixes A1, A2 and … An in sequence, and enabling the solid cross characters of the dot matrixes of each layer to be superposed with the hollow cross characters of the dot matrix A1 of the first layer, so that the composite anti-counterfeiting structure can be obtained.

The application of the composite anti-counterfeiting structure based on the random dot matrix layer is applied to commodity packaging and anti-counterfeiting labels.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides an anti-counterfeiting technology for generating moire patterns by overlapping double-layer or multi-layer related random dot matrix films based on a random dot matrix moire pattern theory and a preparation method thereof. The invention designs a layer of random lattice, and obtains a second layer lattice … … and a third layer lattice … … through zooming, rotation or geometric change on the basis of the lattice, and the lattices are respectively made on the transparent material, when the related lattices are overlapped, the corresponding unique patterns can appear. Compared with the prior anti-counterfeiting technology, the anti-counterfeiting method has the advantages that: low preparation cost, good visual effect, hidden design parameters, visibility with naked eyes and the like.

The random lattice layer breaks through the limitation of the periodic arrangement of the traditional grating, non-periodic, namely random, multiple layers of same lattices are utilized for overlapping and compounding, and coordinate transformation (tiny rotation, scaling or geometric transformation) is carried out on each layer of lattices on the basis of the first layer of lattices, so that novel patterns can be seen from the overlapping structure, and the effect of the novel patterns is higher than the Moire brightness formed by the grating, the patterns are richer, and the preparation technical requirement is higher. For a two-layer structure, the first layer random lattice a1 can be used as an encoding layer, no pattern can be seen at this time, and the second layer lattice a2 can be used as a decoding layer, so that a hidden pattern is obtained by overlapping the two layers; for the structure with more than two layers, each layer of random dot matrix does not display any special pattern, the first layer can be used as a coding layer, the other structural layers can be used as decoding layers, and only when all the decoding layers are overlapped with the coding layer, the hidden pattern can be obtained. Because the arrangement of each layer of random array has correlation, if the coordinate transformation form of each layer of random array is unknown, the related random dot matrix can not be obtained, and the expected pattern can not be realized.

Drawings

FIG. 1 is a perspective view of two superimposed associated random dot matrix layers;

FIG. 2 is a perspective view of a multi-layer random dot matrix layer overlay;

FIG. 3 shows a random dot pattern A1 in example 1;

FIG. 4 shows a random dot pattern A2 in example 1;

FIG. 5 is a graph showing an overlay of the random dot matrix A1 and the random dot matrix A2 in example 1;

FIG. 6 is a graph showing an overlay of the random dot matrix A1 and the random dot matrix A2 in example 2;

FIG. 7 is a graph showing an overlay of the random dot matrix A1 and the random dot matrix A2 in example 3;

FIG. 8 is a graph showing an overlay of the random dot matrix A1, the random dot matrix A2 and the random dot matrix A3 in example 4;

FIG. 9 is a schematic view of the microstructure of the random lattice A1 obtained on the PET film in example 5;

FIG. 10 is a graph showing an overlay of the random dot matrix A1, the random dot matrix A2, the random dot matrix A3 and the random dot matrix A4 in example 5.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.