Identification medium, identification method and identification device
A technology for identifying media and camera devices, which is applied in the field of identifying the authenticity of items, and can solve problems such as difficult identification of authenticity and insignificant anti-counterfeiting effects
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no. 1 approach
[0072] (1-1) Structure of Embodiment
[0073] image 3 It is a conceptual diagram which shows the cross-sectional structure of the identification medium using this invention. exist image 3 The identification medium 300 is shown in the state (unused state) before sticking to the article. The identification medium 300 has a structure including an adhesive layer 302 on the back surface side (adhesion surface side) of the hologram formation layer 303 and an aluminum vapor deposition layer 304 on the front surface side (observation surface side). The adhesive layer 302 is made of an adhesive material and is used to fix the identification medium 300 to an object to be identified. A release paper ((separator) separator) 301 is attached to the exposed surface side (surface side exposed at the time of attachment) of the adhesive layer 302 . When the identification medium 300 is affixed to the article, the release paper 301 is peeled off, the adhesive layer 302 is exposed, and the ...
manufacture example
[0078] The cholesteric liquid crystal layer 306 can be formed by printing with commercially available liquid crystal ink. As this liquid crystal ink, Wacker-Chemie Corporation (ワ ツ Ink made by Kaichi Co., Ltd. Color-changing liquid crystals can be obtained by the following production examples.
[0079] For example, a method of applying a solution containing a liquid crystal material to an alignment substrate, performing twisted nematic alignment in a liquid crystal state, and then fixing the alignment structure of the liquid crystal molecules can be employed. In addition, as such a liquid crystal material, what is necessary is just a liquid crystal material whose liquid crystal molecules have a twisted nematic alignment structure, and either a polymer liquid crystal or a low molecular liquid crystal can be used. Furthermore, as a method of fixing the alignment structure of liquid crystal molecules in this way, when a polymer liquid crystal having a glass transition temperatu...
no. 2 approach
[0100] This embodiment relates to Figure 4 A method in which reuse of the identification medium 300 becomes difficult is shown. Figure 5 It is a front view showing the identification medium of another embodiment. Figure 5 The identification medium 320 shown is for Figure 4 At least a portion of the layer of identification medium 300 is shown with radially incorporated cracks 321 near its perimeter. According to this structure, when the identification medium 320 is peeled off from the state of being attached to the article that is the object of authenticity determination, the identification medium 320 is torn from the crack 321 and reuse becomes difficult. Therefore, it becomes difficult for a malicious person to reuse the identification medium 320 (malicious use).
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