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Color invisible pattern element and preparation method thereof

An invisible and patterned technology, applied in optical elements, polarizing elements, optics, etc., can solve problems such as liquid crystal alignment disorder, loss of hidden meaning, invisible pattern leakage, etc., to achieve high value, good anti-counterfeiting effect, and beautiful product effect

Inactive Publication Date: 2019-11-26
上海先幻新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention has the following deficiencies: 1) The scale drop of the substrate groove of the invention will inevitably produce naked-eye visible boundaries, which will make invisible patterns be detected and leaked before observation, losing hidden meaning ; 2) The boundary of the groove will cause the disorder of the alignment of the liquid crystal, and also make the invisible information be visualized to a certain extent

Method used

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  • Color invisible pattern element and preparation method thereof
  • Color invisible pattern element and preparation method thereof
  • Color invisible pattern element and preparation method thereof

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preparation example Construction

[0059] A second aspect of the present invention provides a method for preparing the colored invisible pattern element as described above, comprising the following steps:

[0060] S1: coating a photosensitive alignment layer material on a substrate with a reflective layer, and drying;

[0061] S2: Exposing different regions of the photosensitive alignment layer with linearly polarized ultraviolet light with different wave vectors, so that the molecules of the photosensitive alignment layer material have different pretilt angles;

[0062] S3: applying a nematic liquid crystal layer material to different regions of the photosensitive alignment layer, drying, and aligning the liquid crystal molecules;

[0063] S4: curing the nematic liquid crystal layer to obtain the color invisible pattern element.

Embodiment 1

[0066] Example 1 : see figure 1 and 2 As shown, embodiment 1 provides a kind of color invisible pattern element, and described color invisible pattern element comprises nematic phase liquid crystal layer 1, photosensitive alignment layer 2 and reflective layer 3, and described photosensitive alignment layer 2 is arranged on described reflective layer 3 and the nematic liquid crystal layer 1; the photosensitive alignment layer 2 includes up to three regions with different molecular pretilt angles relative to the plane of the reflective layer 3 . Wherein the reflective layer 3 is aluminized PET.

[0067] The colored invisible pattern element is prepared by the following method, which specifically includes the following steps:

[0068] Preparation of nematic liquid crystal layer material: by weight, add 2 parts of photoinitiator (IRGACURE369) to the mixed nematic liquid crystal material composed of 75 parts of liquid crystal molecules I, 10 parts of liquid crystal molecules I...

Embodiment 2

[0075] Example 2: see figure 1 and 2 As shown, embodiment 2 provides a kind of color invisible pattern element, and described color invisible pattern element comprises nematic phase liquid crystal layer 1, photosensitive alignment layer 2 and reflective layer 3, and described photosensitive alignment layer 2 is arranged on described reflective layer 3 and the nematic liquid crystal layer 1; the photosensitive alignment layer 2 includes up to three regions with different molecular pretilt angles relative to the plane of the reflective layer 3 . Wherein the reflective layer 3 is a cholesteric liquid crystal layer.

[0076] The colored invisible pattern element is prepared by the following method, which specifically includes the following steps:

[0077] Preparation of nematic liquid crystal layer material: by weight, add 2 parts of photoinitiator (IRGACURE369) to the mixed nematic liquid crystal material composed of 75 parts of liquid crystal molecules I, 10 parts of liquid ...

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Abstract

The invention relates to the technical field of anti-counterfeiting, and particularly relates to a color invisible pattern element and a preparation method thereof. The color invisible pattern elementat least comprises at least a nematic-phase liquid crystal layer, a photosensitive orientation layer and a reflection layer. The photosensitive orientation layer is disposed between the reflection layer and the nematic-phase liquid crystal layer; and the photosensitive orientation layer comprises at least two regions with different molecular pre-tilt angles relative to the plane of the reflectionlayer. Nematic-phase liquid crystal molecules in different regions are oriented in the direction of photosensitive orientation molecules in the corresponding regions, and the different regions have different optical phase delays. When an optical element is observed through a polaroid, different optical delays are produced after polarized light passes through different regions of the element; thewavelength of the reflected light is in the range of visible light; and different colors appear in different regions of the element, and a colorful image is presented, thereby achieving perfect combination of anti-counterfeiting and art.

Description

technical field [0001] The invention relates to the field of anti-counterfeiting technology, in particular to a colored invisible pattern and a preparation method thereof. Background technique [0002] Liquid crystal anti-counterfeiting technology is a widely used anti-counterfeiting technology. Liquid crystals can usually produce special optical effects to achieve the purpose of easy identification and difficult forgery. Among them, the optical anisotropy of the liquid crystal material can be used to form a layer with a certain phase retardation. These layers are colorless and transparent under the naked eye, but can produce polarized light interference under the condition of the presence of a polarizer, showing a certain color. , that is, the color can only be expressed under certain conditions, so it can be considered that the color is invisible, and the specific color is determined by the phase retardation of the liquid crystal layer. Different phase delays and colors c...

Claims

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Application Information

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IPC IPC(8): G02B5/30G09F3/02
CPCG02B5/3016G09F3/0294
Inventor 袁佳玮任旭康方彼岸
Owner 上海先幻新材料科技有限公司
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