Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

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

Inactive Publication Date: 2008-11-12
HUAZHONG UNIV OF SCI & TECH
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] The inventive method arbitrarily selects a pattern, such as text or the icon of the copyright owner, as the encrypted information pattern to be hidden, such as figure 1 The letter "A" in ; the encrypted information pattern is transformed into a phase modulation diffraction grating pattern (such as figure 2 As shown), the human eye 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 information ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com