CN101477252B - Production method of encoded point dynamic diffraction pattern and products produced thereby - Google Patents
Production method of encoded point dynamic diffraction pattern and products produced thereby Download PDFInfo
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- CN101477252B CN101477252B CN200910009809.XA CN200910009809A CN101477252B CN 101477252 B CN101477252 B CN 101477252B CN 200910009809 A CN200910009809 A CN 200910009809A CN 101477252 B CN101477252 B CN 101477252B
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Abstract
The invention provides a method for making a code point dynamic diffraction pattern. The method comprises the following steps: designing a pattern of the code point dynamic diffraction pattern; modulating a recording light beam to change the complex amplitude distribution of the recording light beam on the surface of a photosensitive material; and recording the code point dynamic diffraction pattern on the photosensitive material under the control of a computer according to the designed pattern of the code point dynamic diffraction pattern. At least partial spot-shaped diffraction units in the code point dynamic diffraction pattern are the code point diffraction units formed by the modulated light beam record. The code point dynamic diffraction pattern formed by the method has general anti-counterfeiting characteristics of figure structure, dynamic effect, color distribution and the like of the common code point diffraction pattern under the general observation condition. The light intensity of the diffraction light beams of the code point diffraction units is distributed according to certain rules under the condition of specified illumination, and the truth of the diffraction pattern can be judged by analyzing the light intensity distribution of reproduction light.
Description
Technical field
The invention provides a kind of optical anti-counterfeiting method that is applicable to banknote, credit card, the contour safety product of I.D. and high value added product and products thereof, specifically, relate to optical anti-counterfeiting method of a kind of employing diffraction light change image (DOVID, diffractive optically variable image devices) and products thereof.
Background technology
In general diffraction light change image is made of the relief type diffraction grating, and this diffraction grating can be produced in batches on a large scale with the method for mold pressing.Diffraction light change image reproduces out by grating pair illumination diffraction of light, it comprises all kinds of hologram images, dot matrix image, e-beam (electron beam) image, various coded image of white light and laser reconstruction and image that similar techniques forms etc., is important anti-counterfeiting technology means at present.Aspect high safety product, comprise the various securities and the card card of banknote, credit card, I.D., passport, generally adopted DOVID optical anti-counterfeiting technology.At commodity circulation, first-selected especially this technology of various best brands of product is as preventing to palm off the means of safeguarding the brand reputation.
The dot matrix dynamic diffraction is a kind of smooth variable image that is most widely used, and it is made up of the point-like diffraction element, and promptly each pixel all is an independently diffraction grating.The light that laser instrument sends is divided into two bundles; two-beam intersects the generation interference fringe on the surface of photosensitive material; on photosensitive material, note interference fringe by exposure; obtain a point-like diffraction element; the angle and the position angle of the locus of appliance computer sense of control luminescent material and two bundle laser; the pointwise record that exposes on photosensitive material, developing then to obtain the dot matrix dynamic diffraction, the dot matrix dynamic diffraction that forms can be transferred on the product that will protect by follow-up big production technology.The grating orientation of point-like diffraction element and spatial frequency have determined graphic structure, dynamic effect and the color distribution of dot matrix dynamic diffraction, therefore, the design of dot matrix dynamic diffraction designs the grating orientation and the spatial frequency of each point-like diffraction element in fact exactly.That the shape of point-like diffraction element is generally is square, circular, triangle, hexagon or other arbitrary shapes.
Dot matrix dynamic diffraction brightness height, dynamic strong, range of observation is wide, its eye-catching dynamic effect is given deep impression easily, it realizes its antiforge function by features such as graphic structure, dynamic effect and color distribution.
Summary of the invention
According to an aspect of the present invention, provide a kind of method for making of code point dynamic diffraction, may further comprise the steps: the pattern of design code point dynamic diffraction; Writing light beam is modulated to change the COMPLEX AMPLITUDE of writing light beam on the photosensitive material surface; Pattern according to the code point dynamic diffraction that designs, under the control of computing machine on described photosensitive material the described code point dynamic diffraction of record, in the described code point dynamic diffraction to small part point-like diffraction element be the encoded point diffraction element of utilizing the light beam record through ovennodulation to form.
According to another aspect of the present invention, provide a kind of code point dynamic diffraction, in the described diffractogram to small part point-like diffraction element be the encoded point diffraction element of utilizing the light beam record after the modulation to form.Under common observation condition, described code point dynamic diffraction has the popular anti-counterfeiting characteristics such as graphic structure, dynamic effect and color distribution of common dot matrix dynamic diffraction, and under specific lighting condition, the light intensity of the diffracted beam of encoded point diffraction element distributes according to certain rule in the described code point dynamic diffraction, analyzes the true and false that the light distribution of reproducing diffracted beam then can be judged this diffractogram.
Description of drawings
Fig. 1 shows an embodiment of the method for making of code point dynamic diffraction of the present invention.
Embodiment
Describe an embodiment of the method for making of code point dynamic diffraction of the present invention in detail below with reference to Fig. 1.
At first, in step 101, adopt the pattern of method design code point dynamic diffraction well known in the art.Code point dynamic diffraction is made up of plurality of pixels, and each pixel all is an independently point-like diffraction element.Graphic structure, dynamic effect and the color distribution of the grating orientation of point-like diffraction element and spatial frequency decision code point dynamic diffraction, therefore, the design of code point dynamic diffraction designs the grating orientation and the spatial frequency of each point-like diffraction element in fact exactly.That the shape of point-like diffraction element is generally is square, circular, triangle, hexagon or other arbitrary shapes.
Then, in step 102, design is also made the beam modulation device.According to given lighting condition (light wavelength of for example throwing light on and the incident angle) light distribution of point-like diffraction element a certain position reproduction light in the space down, the applied optics diffraction theory calculates the complex amplitude transmitance of beam modulation device.The optical diffraction theory is physioptial basic theories, can be " scalar diffraction theory " in " Fourier optics " book that light is compiled, China Machine Press published in 1988 with reference to Lu for example.Optical diffraction can be divided into fresnel diffraction and Fraunhofer diffraction usually, is applicable to the diffraction under the different condition, and applicable elements is discussed in this book in detail, can select according to specific circumstances when design beam modulation device.According to result of calculation, make the beam modulation device.The concrete grammar of making the beam modulation device can be photoetching, electron beam lithography, ion beam etching etc.Described beam modulation device both can be an amplitude type, also can be phase-type, can also be mixed type.
Next, in step 103, the beam modulation device of making is placed in the recording beam path by designing requirement, the angle of controlling two-beam in real time according to the graphic structure and the pixel distribution of the code point dynamic diffraction that designs by computing machine and the locus of position angle and photosensitive material, two-beam intersects the generation interference fringe on the surface of photosensitive material, on photosensitive material, note interference fringe by exposure, can obtain an encoded point diffraction element of utilizing the light beam record after modulating.The dot matrix dynamic diffraction that comprises the encoded point diffraction element just is called code point dynamic diffraction.Thus, each the point-like diffraction element in the code point dynamic diffraction can be noted in the pointwise record that exposes on photosensitive material on photosensitive material.
After this, develop, can produce the code point dynamic diffraction that comprises the encoded point diffraction element in step 104.
At last, in step 105, can produce in batches described code point dynamic diffraction by technologies such as electroforming, mold pressings.The code point dynamic diffraction of making can be transferred on the finished product that will protect by follow-up big production technology.
Be to utilize the encoded point diffraction element of the light beam record after the modulation to small part point-like diffraction element in the code point dynamic diffraction of making according to method of the present invention.Described encoded point diffraction element is under the certain angle illumination light, and the light intensity of diffracted beam distributes according to certain rule, and the light distribution of analyzing playback light just can be judged the true and false of this code point dynamic diffraction.
Described code point dynamic diffraction can be transmission-type also can be reflective.
When carrying out the anti-false sign design, described code point dynamic diffraction picture can use separately, also can be used in combination, comprising all kinds of hologram images, dot matrix image, e-beam (electron beam) image or various coded image with other light variable image (OVD).
The present invention can use with forms such as labels, sign, wide, safety line, can be bonded on the various article by various bonding mechanisms, for example, perhaps transfer on the safety products such as banknote, credit card or and transfer on the high value added product by the adhesive sticker mode by thermoprint.Safety line can be partially submerged into and make the cheque paper that has opened window safety line in the paper.
Claims (8)
1. the method for making of a code point dynamic diffraction may further comprise the steps:
The pattern of design code point dynamic diffraction;
Writing light beam is modulated to change the COMPLEX AMPLITUDE of writing light beam on the photosensitive material surface;
Pattern according to the code point dynamic diffraction that designs, under the control of computing machine on described photosensitive material the described code point dynamic diffraction of record, in the described code point dynamic diffraction to small part point-like diffraction element be the encoded point diffraction element of utilizing the light beam record through ovennodulation to form;
Described photosensitive material is developed.
2. method according to claim 1 is characterized in that, utilizes the beam modulation device of amplitude type, phase-type or mixed type that writing light beam is modulated.
3. method according to claim 1 and 2 is characterized in that, being shaped as of described encoded point diffraction element is square, circular, triangle or hexagon.
4. code point dynamic diffraction of utilizing the described method of claim 1 to form.
5. code point dynamic diffraction according to claim 4 is characterized in that, described code point dynamic diffraction is transmission-type or reflective.
6. code point dynamic diffraction according to claim 4 is characterized in that, being shaped as of described encoded point diffraction element is square, circular, triangle or hexagon.
7. diffraction light variable image that comprises code point dynamic diffraction as claimed in claim 4, it is characterized in that, code point dynamic diffraction in the described diffraction light variable image and other light variable image are used in combination, and described other light variable image comprises all kinds of hologram images, dot matrix image, electron beam image and coded image.
8. label, sign, wide or safety line that comprises as any described code point dynamic diffraction in the claim 4 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910009809.XA CN101477252B (en) | 2009-01-23 | 2009-01-23 | Production method of encoded point dynamic diffraction pattern and products produced thereby |
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| Application Number | Priority Date | Filing Date | Title |
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| CN200910009809.XA CN101477252B (en) | 2009-01-23 | 2009-01-23 | Production method of encoded point dynamic diffraction pattern and products produced thereby |
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| Publication Number | Publication Date |
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| CN101477252A CN101477252A (en) | 2009-07-08 |
| CN101477252B true CN101477252B (en) | 2011-01-19 |
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Address after: 100044 Beijing city Xicheng District Xizhimen Street No. 143 Patentee after: China Banknote Printing and Minting Group Co.,Ltd. Address before: 100044 Beijing city Xicheng District Xizhimen Street No. 143 Patentee before: CHINA BANKNOTE PRINTING AND MINTING Corp. |
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