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An optical anti-counterfeiting film device

An optical anti-counterfeiting and film technology, applied in the field of anti-counterfeiting, can solve the problems of inconvenience to carry, not easy to popularize, and high cost of detection equipment

Active Publication Date: 2019-08-27
上海先认新材料合伙企业(有限合伙) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of anti-counterfeiting technology relies on the physical and optical properties of the material itself. In theory, as long as a breakthrough in the material is obtained, it will declare that it has lost its anti-counterfeiting effect.
At the same time, its complex detection equipment is expensive, inconvenient to carry, and not easy to popularize

Method used

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  • An optical anti-counterfeiting film device
  • An optical anti-counterfeiting film device
  • An optical anti-counterfeiting film device

Examples

Experimental program
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Effect test

Embodiment 1

[0075] The first transmission layer (1) and the second transmission layer (2) are respectively formed on the TAC, the first transmission layer (1) is a circular polarizer, and the second transmission layer (2) has two optical axis directions at an angle of 89° , the orientation direction of the nematic liquid crystal molecules in the optical anisotropy region with phase retardation of λ / 4 is as follows Figure 8 As shown, constitute the patterned information. The external polarizer (3) is a linear polarizer with a surface structure such as Figure 9 As shown, it consists of a polarizing area (31) and a non-polarizing area (32). The structure of this optical anti-counterfeiting film device is as follows: figure 1 , where the direction of the arrow is the direction of the transmitted light. The optical anti-counterfeit film device is compounded with paper in the form of a transparent window. In transmitted light, the transparent window is approximately transparent. Place th...

Embodiment 2

[0077] The optical anti-counterfeiting film device of the present invention has a first transmission layer (1) having a selective transmission function for polarized light and an optically anisotropic transmission layer having a first region and a second region with different optical anisotropy, that is, the second transmission layer (2), whose structure is as figure 1 shown. The second transmission layer (2) has an optically anisotropic region with an included angle between two optical axes of 5° and a phase retardation difference of λ / 4, and the first transmission layer (1) is an optically anisotropic region with a selective transmission function for polarized light The cholesteric liquid crystal layer, the second transmission layer is a nematic liquid crystal layer. The optical anti-counterfeiting film device is applied to the anti-counterfeiting of valuable items. The structure of this optical anti-counterfeiting film device is as follows: figure 1 shown. Place the ext...

Embodiment 3

[0079] An optical anti-counterfeiting film device, having Figure 7In the structure shown, the first transmission layer (1) is a cholesteric liquid crystal layer with selective transmission function for polarized light, the second transmission layer (2) has two optical axis directions at 80°, and the phase retardation is λ The optical anisotropy region of / 4, the third transmission layer (4) has an optical anisotropy region with an angle between two optical axes of 7° and a phase retardation difference of 3λ / 4. Both the second transmission layer and the third transmission layer are nematic liquid crystal layers. The external polarizer is a circular polarizing plate, and the width H31 of the polarizing region (31) of the circular polarizing plate and the width H32 of the non-polarizing region (32) and the composition of the second transmission layer (2) and the third transmission layer (4) each The width H of repeating units satisfies the relationship: H31=H / 2 and H32=H. Plac...

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PUM

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Abstract

The invention provides an optical false-proof film device, comprising a first transmission layer (1), a second transmission layer (2), and an external polarizing layer (3) used for detection. The first transmission layer (1) is a polarizing layer having a selective transmission function for polarized light. The second transmission layer (2) comprises a first set of regions and a second set of regions consisting of at least two different optically anisotropic units alternatively distributed, and is located on the lower surface of the first transmission layer. The external polarizing layer (3) at least comprises a polarizing region (32) and a non-polarizing region (31) consisting of a polarizing unit (311) and a non-polarizing unit (321). The optical false-proof film device of the present invention is combined with a valuable article in the form of a transparent window, a product tag and a film, and the information contained in the optical false-proof film device is recognized by the external polarizing layer. The optical false-proof film device is used for preventing counterfeiting of valuable goods.

Description

technical field [0001] The invention relates to the field of anti-counterfeiting, in particular to an optical anti-counterfeiting film device. Background technique [0002] Invisible pattern is a commonly used anti-counterfeiting method, which plays a concealed anti-counterfeiting role. [0003] One of them is based on invisible patterns made of fluorescent, infrared and other materials, which can be assisted in identification by special detection tools. This type of anti-counterfeiting technology relies on the physical and optical properties of the material itself. In theory, as long as a breakthrough in the material is obtained, the anti-counterfeiting effect will be declared lost. At the same time, its complex detection equipment is expensive, inconvenient to carry, and not easy to popularize. [0004] Another class of invisible patterns (as disclosed in US4033059 and US4588212) is based on printing techniques by forming offset or gravure lines in staggered, undulating ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30G02F1/1335G02F1/13363G02F1/137
CPCG02B5/3016G02F1/133528G02F1/133636G02F1/13718G02F1/133638
Inventor 袁佳玮
Owner 上海先认新材料合伙企业(有限合伙)