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Method of mfg. achromatic color changed silver diffraction images

A manufacturing method and achromatic technology, applied in optical components, optics, instruments, etc., can solve the problems of needing graphic masks, unfavorable precise optical variable images, and large granularity of stripe speckle

Active Publication Date: 2006-09-20
SUZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the granularity of the striped speckle produced by this scheme is very large, and a graphic mask is required at the same time, which is not conducive to the production of precise optically variable images

Method used

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  • Method of mfg. achromatic color changed silver diffraction images
  • Method of mfg. achromatic color changed silver diffraction images
  • Method of mfg. achromatic color changed silver diffraction images

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Embodiment 1: A method for making an achromatic color-changing silver diffraction image, comprising the following steps:

[0047] (1) Prepare a binary optical element, which is a pure phase diffractive optical element, and its far-field diffractive light field is a slit;

[0048] (2) Construct a 4F optical system, the light emitted by the laser light source is used as the incident light after collimation and aperture, and the recording material is placed on the image plane of the 4F optical system, and the binary optical element obtained in step (1) is placed on the On its transformation plane, as a beam splitting element, the incident light is divided into two strip-shaped light fields, and after being imaged by the lens group, a speckle interference image unit is formed on the surface of the recording material, wherein the front focal length of the 4F optical system If it is greater than the back focal length, the reduced image of the diaphragm is obtained on the imag...

Embodiment 2

[0060] Embodiment 2: through control Figure 4 The rotating mechanism 9 in can record the speckle structures with different orientations, see the attached Figure 10 As shown, the orientations of the diffraction slits of the speckle structure with different orientations are different, so that the lithographic image has the effect of light change, that is, the color-changing silver light-change image mentioned in this patent. Figure 11 It is a real photo map of the optically variable image.

Embodiment 3

[0061] Embodiment three: replace Figure 4 The beam splitting element 7 can produce optically variable images with different effects. For example, when the beam splitting element is a one-dimensional grating, the photolithographic image has a rainbow effect; when the beam splitting element is an orthogonal grating, the photolithographic image has a rainbow effect in the two-dimensional direction (it is called an orthogonal plain rainbow in the industry) ; When the beam splitting element is a binary phase grating, the photoetched image has a color-changing silver effect. Therefore, if the photolithographic rainbow effect and the color-changing silver effect are combined into a new type of light-variable image, only different beam splitting elements need to be replaced. Since the replacement of the phase element does not affect the position of the light spot, the above method can realize any mosaic combination of the achromatic diffraction image and the rainbow diffraction opti...

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Abstract

The invention discloses a method for making achromatic alteration silver diffraction pattern, comprising the following steps of: (1) preparing a binary optical element whose far-field diffraction optical field is a slot; (2) building a 4F optical system, placing the binary optical element on its conversion plane as a beam splitting element to split incident light into two strip optical fields, which are imaged by lens set to form a speckle interference image unit on the surface of a recording material; (3) changing relative position between the optical system and the recording material to record a corresponding strip speckle interference image unit so as to obtain the achromatic alteration silver diffraction pattern. Besides, the invention provides a device for implementing the method.

Description

technical field [0001] The invention relates to a method for realizing an achromatic color-changing silver diffraction image, in particular to using a binary phase element as a beam splitter, the diffraction light field of which is interfered to form light spots with striped speckle, the striped speckle The phase structure, the far-field diffraction of light is an achromatic slit shape, and the strip-shaped speckles with different orientations can form a color-changing silver diffraction image. Background technique [0002] In the prior art, the laser rainbow transfer material has gradually become an important printing, packaging and appearance decoration material. Through digitally controlled interference light spot recording, a complex diffractive light-variable image can be formed. The laser image material thus prepared has a rainbow effect and is colorful, and its color distribution and graphics change with the change of the observation position. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/42
Inventor 周小红陈林森魏国军邵洁解正东解剑锋毛利华
Owner SUZHOU UNIV
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