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Method of forming coloured dot array diffraction image and product made wing said method

A diffractogram and image technology, which is applied in the field of optical anti-counterfeiting methods and its products, can solve problems such as no color meaning, and achieve the effect of wide observation range, obvious features, and easy identification

Active Publication Date: 2006-01-25
ZHONGCHAO SPECIAL SECURITY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this prior art lattice diffraction pattern does not have an image with clear color meaning

Method used

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  • Method of forming coloured dot array diffraction image and product made wing said method
  • Method of forming coloured dot array diffraction image and product made wing said method
  • Method of forming coloured dot array diffraction image and product made wing said method

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Embodiment Construction

[0010] figure 1 The general principle of grating diffraction is shown. For the convenience of description and without loss of generality, suppose that when the illumination light 3 irradiates the grating 1 at an incident angle θ, and the incident surface is perpendicular to the grating stripes, the diffraction angle of the diffracted light 4 is , 2 is the normal line of the grating 1, and the The spatial frequency is ξ, and the wavelength of the illuminating light is λ. According to the principle of optics, the direction of diffracted light is determined by the following formula:

[0011] sin  m =mξλ+sinθ (1)

[0012] Wherein, m is an integer, representing a diffraction order. In general, the effective diffraction order is plus (or minus) one order, that is, m=±1. It can be known from formula (1) that when light of different wavelengths irradiates the grating at the same incident angle θ, their diffraction angle  m，λ is different, the larger the λ, the larger t...

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Abstract

The invention provides a method of forming color point array diffraction image and the product made by the method. In the course of recording a point array diffraction image, the method records each pixel as a composite grating, where the composite grating can be looked upon as being composed of two basal gratings G1 and G2; selects the parameters of the basal gratings according to the colors of the image to make the pixel recover the appointed image color in a special direction on a certain illuminating condition, i.e. recovering the appointed image color in the observing direction.

Description

technical field [0001] The invention relates to an optical anti-counterfeiting method and its product, in particular to an optical anti-counterfeiting method and its product using optically variable images (OVD, Optically Variable Devices). Background technique [0002] An optically variable image is an image reproduced by the diffraction effect of a diffraction pattern, which includes various holographic images, dot matrix images, e-beam (electron beam) images, various encoded images and similar technologies reproduced by white light and laser The formed images have been widely used in the field of anti-counterfeiting. In terms of products with high security requirements, such as banknotes, credit cards, ID cards, passports and other valuable tickets or cards, OVD optical anti-counterfeiting technology is widely used. In the field of commodity circulation, this technology is the first choice for various famous brand products as a means to prevent counterfeiting and maintai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/44G02B27/42
Inventor 张静方朱军王晓利
Owner ZHONGCHAO SPECIAL SECURITY TECH
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