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Genuine-fake identification method for laser holographic plate-making

A laser holography, authenticity technology, applied in the field of anti-counterfeiting, can solve the problems of difficult details or authenticity identification of technical parameters, lack of quantification, easy to be deciphered, etc., to achieve the effect of simple and easy identification method and low cost

Inactive Publication Date: 2009-02-04
SHANDONG TAIBAO PREVENTING COUNTERFEIT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is: this technology is easy to be deciphered, and the imitation effect is equivalent to the genuine effect
The disadvantage is: once it is counterfeited, it is difficult to identify the authenticity of the details or technical parameters
The disadvantages are: the content of the miniature information is not easy to disclose; the identification is only based on whether there is a miniature information, and there is a lack of further identification requirements for the miniature information
The disadvantage is that it needs to be compared and compared with the genuine product by professionally trained personnel, mainly based on visual perception, and lacks quantitative content that can be clearly used as a legal basis - written anti-counterfeiting key points

Method used

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  • Genuine-fake identification method for laser holographic plate-making
  • Genuine-fake identification method for laser holographic plate-making
  • Genuine-fake identification method for laser holographic plate-making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Use electron beam scanning to obtain a row of Chinese character information positioning reference masks with a height of 0.1mm and a length of 10mm, and use a single laser beam with a wavelength of 441.6nm to perform optical copying on the photoresist photosensitive material, and the exposure amount is 100mJ / cm2; Control the average diameter of the speckle to 0.02mm, record holographically, and the exposure amount is 50mJ / cm2. The subsequent preparation process includes development, electroforming, hot pressing and other processes to produce a holographic master. A CCD is placed at the image plane of the 100X magnified optical path to record a standardized phase image of the set area, and the image pixels are 2048×1536. Color inkjet printer output images (such as figure 1 , 2 shown). The reproduction is made by molded reproduction, and its partially enlarged schematic diagram is as follows image 3 , 4 As shown in the identification, use a 40 times magnifying glass ...

Embodiment 2

[0046] See attached Figure 5 , 6 , and the difference from Example 1 is: the average diameter of the control speckle is 0.05mm; the standardized phase image is stored in digital form; the replica is made by laser copying, and its partial enlarged schematic diagram is as follows Figure 7 , 8 As shown, when identifying, place a CCD at the image plane of the 100X magnified optical path to obtain a digital image of the set area of ​​​​the sample to be inspected, and use a traditionally called "pattern recognition" program to compare the correlation with the standardized phase image to identify authenticity , identified by the program, Figure 8 and Figure 6 A correlation coefficient greater than 0.9 indicates a true replica.

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Abstract

An authenticity identification method for laser holographic plate making belongs to the technical field of laser holographic plate making identification methods; the method is characterized in that graphic information locator benchmarks are overprinted or superimposed on the laser holographic plate making region micro-constituted by random speckles; a partial enlarged photograph are obtained from the region on a holographic master plate through photomicrography to serve as the standardized phase image; during the authenticity identification, a magnifier / microscope is used to observe the conformity degree between the graphics features of a given region on the product copied by the master plate and the provided standard image so as to identify the authenticity of the laser holographic product. The identification method is simple and rapid to implement and low in cost, and is accurate.

Description

technical field [0001] The invention relates to an identification method for laser holographic plate-making, in particular to a method for authenticity identification using micro-optical processing and speckle hologram microscopic features. [0002] The invention is mainly applied in the technical field of anti-counterfeiting. Background technique [0003] Hologram (Hologram) was proposed by Gabor in 1948. With the advent of lasers in 1962, Leith and Upatnix invented off-axis holography. In 1969, Benton (Benton) invented rainbow holography, a holography using white light as a display light source. This invention is a welcome first step for holograms to go out of the laboratory and into the society. In order to solve the global problem of counterfeiting and counterfeiting, people have widely used holography in the field of anti-counterfeiting, and achieved gratifying results. Up to now, the holographic printing industry still occupies a pivotal position in the anti-counterf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03F7/00
Inventor 盖树建张钦永田加密蒋胜利田兴坡
Owner SHANDONG TAIBAO PREVENTING COUNTERFEIT
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