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Process for preparing phase regulating diffraction light grating encrypted anti-false identifier

A diffraction grating and phase modulation technology, which is applied in optics, optical components, instruments, etc., can solve the problems of spreading and reducing the anti-counterfeiting performance of molded holographic marks, and achieve the effect of improving anti-counterfeiting strength and increasing the difficulty of counterfeiting

Inactive Publication Date: 2007-04-18
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
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Problems solved by technology

Moreover, with the rapid popularization of molded holographic technology, the counterfeiting technology of molded holographic anti-counterfeiting marks has also spread, thereby reducing the anti-counterfeiting performance of molded holographic marks

Method used

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  • Process for preparing phase regulating diffraction light grating encrypted anti-false identifier
  • Process for preparing phase regulating diffraction light grating encrypted anti-false identifier
  • Process for preparing phase regulating diffraction light grating encrypted anti-false identifier

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Embodiment Construction

[0024] The method of the present invention arbitrarily selects a pattern, such as text or the icon of the copyright owner, as the encrypted information pattern to be hidden, such as the letter "A" in Figure 1; the encrypted information pattern is converted into a phase modulation For the diffraction grating pattern (as shown in FIG. 2 ), human eyes cannot directly distinguish what is the encrypted information in the modulated diffraction grating pattern. Since the modulated diffraction grating pattern cannot be realized directly by optical methods, it can only be calculated under certain parameter conditions according to optical principles. According to the principle of Fresnel imaging, the image function on the imaging optical plane is obtained by calculation method, which is represented by the function U(ξ, η), where (ξ, η) is the coordinate of the image plane, and this image function U(ξ, η) is Modulated diffraction grating pattern for encrypted information. The hidden inf...

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Abstract

The invention discloses phase modulation diffraction grating enciphered anti-fake mark preparing method. It includes the following steps: selecting out one pattern as enciphered information pattern; transforming to phase modulation diffraction grating pattern; shortening to the size generated optical diffraction as phase modulation diffraction grating making unit; using cameo structure form to make the unit set on the film. The produced enciphered anti-fake mark of the invention can change the enciphered information into optical information which can not be determined by human eye. Thus it needs machine identifying method to detect. This can increase faking difficulty in order to improve anti-fake performance.

Description

technical field [0001] The invention belongs to the technical field of laser holographic anti-counterfeiting, and in particular relates to a method for preparing a phase-modulated diffraction grating encrypted anti-counterfeiting mark. Background technique [0002] my country has started the development of laser embossed holographic technology since the mid-1980s. Due to the emergence of the embossed holographic process, low-cost mass production of holograms can be realized, so laser embossed holographic marks have quickly been applied in anti-counterfeiting security. [0003] Due to the successful application of laser holographic anti-counterfeiting technology, it has become the number one counterfeit target of counterfeiters, and they try their best to forge anti-counterfeiting holographic marks. Moreover, with the rapid popularization of molded holographic technology, the forgery technology of molded holographic anti-counterfeiting labels has also spread, thereby reducin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00
Inventor 曹汉强张建军王树初陈汝钧邓承志
Owner HUAZHONG UNIV OF SCI & TECH
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