CN101244679A - Method for implementing false prevention by using metamerism magnetism to match with printing ink - Google Patents
Method for implementing false prevention by using metamerism magnetism to match with printing ink Download PDFInfo
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- CN101244679A CN101244679A CN 200710063963 CN200710063963A CN101244679A CN 101244679 A CN101244679 A CN 101244679A CN 200710063963 CN200710063963 CN 200710063963 CN 200710063963 A CN200710063963 A CN 200710063963A CN 101244679 A CN101244679 A CN 101244679A
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Abstract
The invention provides a method to realize high level composite anti-counterfeit, comprising a plurality of steps: choosing two kinds of magnetic ink with different magnetism and infrared characteristics to form metamerism magnetic paired ink; respectively printing pattern as anti-counterfeit information on the same printing carrier; the printed anti-counterfeit information in specific infrared band can simultaneously display the characteristics of absorption and reflection and has magnetic characteristic, can effectively achieve high level machine reading anti-counterfeit effect. The anti-counterfeit method provided by the method is a combination of infrared anti-counterfeit characteristics and magnetic anti-counterfeit characteristics; printing relative anti-counterfeit information on a proper position of anti-counterfeit product improves the level of anti-counterfeit identification and increases the difficulty of counterfeiting.
Description
Technical field
The present invention relates to field of anti-counterfeit technology, specifically about utilizing metamerism magnetic pairing printing ink to realize false proof technology, to provide anti-counterfeiting technology content higher anti-counterfeiting product.
Background technology
Magnetic ink is applied to that marketable securities are false proof traces back to the thirties in last century, and magnetic characteristic can be traced back to the fifties in last century as the application of machine-readable feature.Up to the present, the application mode of magnetic characteristic probably has four kinds, and promptly magnetic characteristic is applied to gravure, magnetic characteristic and is applied to that protruding seal, magnetic characteristic are applied to safety line, magnetic characteristic embodies its feature such as various magnetic card by form of film.
Soft, retentive material is applied to the existing bibliographical information in false proof field abroad.Disclose a kind of anti-counterfeiting line that contains magnetic material as US7037606, be used for the false proof of banknote, it can adopt serigraphy and printing, and wherein magnetic material is the mixture of Hard Magnetic and soft magnetic materials, utilizes feature soft, Hard Magnetic to realize false proof.And for example US6838166 discloses a kind of multi-layered magnetic pigments, one center magnetosphere is arranged in the middle of multilayer chip powder and sheet metal pigment, become the flakelike powder magnetic paint, the center magnetosphere has first first type surface, opposite second major surface and at least one side, first reflecting layer is at first first type surface of magnetosphere, second reflecting layer is at second first type surface of magnetosphere, magnetosphere can be Hard Magnetic and soft magnetic materials, this multi-layered magnetic pigments can be used for printing ink, make product have colour shift effect or 3-D effect, security of products and ornamental is provided simultaneously.
From improving anti-counterfeiting technology content, utilize INFRARED ABSORPTION printing ink, infrared external reflection printing ink on product, to print anti-counterfeiting information, and utilize the infrared pairing printing ink of INFRARED ABSORPTION printing ink and the configuration of infrared external reflection printing ink that report is all arranged.But the pigment that is used for infrared pairing printing ink at present all is INFRARED ABSORPTION or transparent pigment, and it does not have magnetic characteristic, and magnetic material is in the majority with black, and the magnetic ink of making does not generally have special infrared characteristic yet.From technical standpoint, be formulated in solid colour under the visible light and infrared signature and/or magnetic characteristic have the infrared magnetic printing ink of obvious difference, especially make infrared signature and magnetic characteristic satisfy machine-readable requirement, great difficulty is arranged.Based on such present situation, at present the mode of comparative maturity can only provide the anti-fake machine reading of simple infrared signature or simple magnetic characteristic aspect false proof.
Along with society rises day by day to the requirement of anti-counterfeiting technology, the false proof means that more and more require to have the composite anti-fake function improve false proof level.
Summary of the invention
The technical problem underlying that desire of the present invention solves just provides a kind of new composite anti-fake technology, by utilizing metamerism magnetic pairing printing ink that a kind of technological means that realizes composite anti-fake is provided, the anti-counterfeiting information of printing can show absorption and reflectance signature simultaneously under specific (setting) infrared band, and having a magnetic characteristic, the identification by specific detectors can effectively realize high-level machine-readable anti-false.
The present invention at first provides a kind of false proof method that realizes, this method comprises selects magnetic characteristic and infrared signature two kinds of magnetic inks all inequality to form metamerism magnetic pairing printing ink, prints the pattern that can be used as anti-counterfeiting information respectively on the same carrier of undertaking the printing of.
According to the solution of the present invention, wish to filter out for two kinds of printing ink forming metamerism magnetic pairing printing ink all visible and color is closely little in the visible region, but under the setting spectrum of infrared light region, a kind of printing ink has the INFRARED ABSORPTION performance, and another kind of printing ink then has properties of infrared reflection.
Further, the invention provides and realize that false proof means are to use the infrared magnetic printing ink with metamerism characteristic as pairing printing ink by screening, promptly, make infrared pairing printing ink with soft magnetism and Hard Magnetic feature, make the different printing ink of two kinds of magnetic properties two kinds of ink colors of visible light closely little (homochromy substantially), visual can not the resolution; And in region of ultra-red, under specific detectors, can discern (visible level of the two has obvious difference).The present invention uses two kinds of such printing ink pairings, make infrared pairing printing ink with magnetic characteristic, infrared anti-false feature and magnetic anti-counterfeit feature is compound, and realize anti-fake machine reading, anti-counterfeiting performance is improved a lot, and the using method of two kinds of printing ink can variation.Promptly, the anti-counterfeiting characteristic that the present invention obtains is embodied by metamerism magnetic pairing printing ink, and be printed to machine readable pattern (anti-counterfeiting information), and this pattern can be read identification (infrared detection and magnetic detection) under specific detectors, the compound of such two kinds of features certainly will have been improved simple infrared signature or simple magnetic characteristic anti-fake machine reading level, thereby effectively realizes utilizing the purpose of machine-readable composite anti-fake.
The printing ink that is applicable to the false proof means of the present invention all has the anti-counterfeiting characteristic of itself, and itself can use as common Antiforge infrared ink, but when using as pairing printing ink, requiring two kinds of employed pigment of printing ink is different aspect infrared property.That is, in two kinds of printing ink used pigment in the visible region all as seen, but in region of ultra-red a kind of pigment as seen, another pigment is invisible fully, and the two infrared spectrum should have very big difference.Preferably, the difference of the ir-absorbance of described pairing printing ink or infrared reflectivity is greater than 15%.For example, the feature that shows as Fig. 1 respectively of the infrared spectrum of two kinds of magnetic paints.
As can be seen from Figure 1, the infrared property of the metamerism magnetic pairing printing ink that the present invention requires to use is different fully, and under infrared specific spectrum, a kind of printing ink has the INFRARED ABSORPTION performance, and another printing ink has properties of infrared reflection.On the other hand, two kinds of printing ink forming metamerism magnetic pairing printing ink also should have different magnetic characteristics, for example, show that the printing ink of INFRARED ABSORPTION has soft magnetism or semihard magnetic feature, show that the printing ink of infrared external reflection then has the Hard Magnetic feature, and vice versa.Preferably, described Hard Magnetic is characterized as: residual induction is greater than 10emu/g, coercivity at 100 oersteds (Oe) between 1000 oersteds; Described soft magnetism or semihard magnetic are characterized as: residual induction is less than 10emu/g, and coercivity is less than 100 oersteds.The soft magnetic materials or the half-hard magnetic material that are applied in the printing ink can be metal or alloy class materials, for example, and iron, nickel, cobalt, zinc, manganese, copper etc. or its alloy; Hard magnetic material then can be for oxide, barium (strontium) ferrite of iron, contain the metallic iron oxysome of rare earth etc.The selection and the use of these concrete magnetic materials are routine techniques.
The determined metamerism magnetic pairing of the present invention color of ink can be diversified, for example redness, blueness, green, purple, black, brown etc., the conventional pigment that the coloring pigment that uses uses as Antiforge infrared ink, for example, the phthalocyanine serial pigment, but require the infrared signature of two kinds of printing ink that notable difference is arranged.
The method of patterning that the present invention prints as anti-counterfeiting information on the carrier of undertaking the printing of comprises: two kinds of printing ink are applied to the different piece of same pattern, that is, will have the soft magnetism printing ink of characteristic infrared absorption and have that the Hard Magnetic printing ink of infrared external reflection feature is parallel to be used to print a pattern; The imprint of two kinds of printing ink is distributed in the different pattern of the carrier of undertaking the printing of; Perhaps, the pattern that adopts a kind of printing ink to print is included in the pattern of the another kind of printing ink printing of matching with it, for example, on the contrary the pattern that soft magnetism printing ink with characteristic infrared absorption is formed is contained in the pattern that Hard Magnetic printing ink with infrared external reflection feature formed or.Described metamerism magnetic pairing printing ink can comprise conventional ink types such as gravure ink, letterpress printing ink, offset ink or screen printing ink, and pairing printing ink can be identical or different kind.Be the appearance requirement that satisfies printing and the disguise of anti-counterfeiting characteristic, two kinds of printing ink of described composition metamerism magnetic pairing printing ink are all visible and be homochromy in the visible region, and the aberration of two ink colors is less than 3%.After the combination of having determined printing ink middle infrared material and magnetic material, the concrete prescription and the preparation method of every kind of printing ink are known technology, and the present invention does not do special qualification and description.
Key of the present invention has provided a kind of new false proof method of realization, determines can realize matching two kinds of metamerism magnetic inks that use by screening, and utilizes this pairing printing ink to print anti-counterfeiting information, has more improved the technology content of anti-counterfeiting characteristic.And, the infrared signature and the magnetic characteristic of described metamerism magnetic pairing printing ink all can be realized anti-fake machine reading, promptly, can carry out machine-readable discriminating infrared anti-false according to the infrared external reflection difference, for example, test the characteristic infrared absorption that security pattern has or the reflectivity difference of reflectance signature with the DATACOLOR instrument, also can carry out machine-readable discriminating magnetic according to soft, Hard Magnetic feature, for example, magnetic characteristic uses vibrating specimen magnetometer to measure, thereby the guarantee of multiple anti-fake is provided.
The carrier of undertaking the printing of that is used in the inventive method print does not have special requirement, as long as can satisfy the printability of used printing ink, for example can comprise paper substrate, PVC material (PVC substrate or PVC film), glass (glass plate, vial etc.) suitable materials printed such as, the false proof printing that provides can be any anti-counterfeiting characteristic to be had product than higher demand, can be marketable securities, bill, documentary evidence or anti-false wittness card etc., for example bank note, check, coupons, deposit receipt, documentary evidence, forwarding document, costoms forms, lottery ticket, marketable securities that false proof field such as admission ticket is commonly used or card card.
In a word, false proof means provided by the invention are the compound of infrared anti-false feature and magnetic anti-counterfeit feature, and relevant anti-counterfeiting information is printed on the appropriate location of anti-fake product, have improved the level of false proof discriminating, have more increased counterfeit difficulty.
Description of drawings
Fig. 1 is the Infrared Reflective Spectra of the red different spectrum magnetic pairing printing ink of embodiment 1 use, and curve A is represented the infrared external reflection curve of soft magnetism printing ink among the figure, and curve B is represented the infrared external reflection curve of Hard Magnetic printing ink.As can be seen, in infrared light region, the absolute value of the reflectivity difference of Hard Magnetic printing ink and soft magnetism printing ink is more than 15%.
Fig. 2 and Fig. 3 are respectively the hysteresis curve figure of Hard Magnetic printing ink and soft magnetism printing ink in the red different spectrum magnetic pairing printing ink that embodiment 1 uses.
Specific embodiments
Introduce the realization and the characteristics of technical solution of the present invention in detail below in conjunction with specific embodiment, understand spiritual essence of the present invention and beneficial effect, but but can not constitute any qualification the present invention's practical range to help the reader.
Embodiment 1
Adopt red different spectrum magnetic pairing printing ink to print anti-fake product.
Below prescription is the gravure ink prescription:
The prescription infrared external reflection ink formulations of INFRARED ABSORPTION printing ink
MnZnFe 15％ Co-Y-Fe
2O
3 20％
Red 10% phthalocyanine red 10% of phthalocyanine
Connect material 60% and connect material 55%
Auxiliary agent 5% auxiliary agent 5%
Soft magnetic materials is MnZn ferroalloy (MnZnFe) in the above-mentioned prescription, and hard magnetic material is a ferrite.Coloring pigment is for providing the conventional pigment of the painted usefulness of printing ink, that is, and and the phthalocyanine red.
The different spectrum magnetic pairing of this redness printing ink is to be composed of by INFRARED ABSORPTION printing ink and infrared external reflection printing ink, INFRARED ABSORPTION printing ink and infrared external reflection printing ink color under visible light is all shown in red, and two ink colors aberration are less than 3%, show as INFRARED ABSORPTION and infrared external reflection respectively at infrared region, its reflection collection of illustrative plates such as Fig. 1; Simultaneously, INFRARED ABSORPTION printing ink has the soft magnetism feature, and infrared external reflection printing ink has the Hard Magnetic feature, and its magnetic feature is referring to Fig. 2 and Fig. 3, and the about 30emu/g of the remanent magnetism of Hard Magnetic printing ink, coercivity 300Oe, the remanent magnetism of soft magnetism printing ink are 0 substantially, and coercivity is 10Oe.
Utilize this pairing printing ink product surface printed information (being distributed in the same pattern), INFRARED ABSORPTION printing ink is consistent with the infrared external reflection ink colors under visible light, visual undistinguishable, and the visibility of two kinds of printing ink has obvious difference under infrared identification instrument, promptly, visible and the infrared external reflection ink logo of INFRARED ABSORPTION ink logo hardly as seen, and it is machine-readable to utilize infrared signature and magnetic characteristic to carry out, and reaches the machine-readable purpose of composite anti-fake thus.
Embodiment 2
Adopt green different spectrum magnetic pairing printing ink to print anti-fake product.
Below prescription is the letterpress printing ink prescription:
The prescription infrared external reflection ink formulations of INFRARED ABSORPTION printing ink
Phthalocyanine green 15% phthalocyanine green 20%
Connect material 60% and connect material 55%
Auxiliary agent 5% auxiliary agent 5%
Soft magnetic materials is copper-manganese kirsite (MnCuZn) in the above-mentioned prescription, and hard magnetic material is a barium ferrite.Coloring pigment is for providing the conventional pigment of the painted usefulness of printing ink, for example, and the phthalocyanine green serial pigment.
The different spectrum magnetic pairing of this green printing ink is to be composed of by INFRARED ABSORPTION printing ink and infrared external reflection printing ink, INFRARED ABSORPTION printing ink and infrared external reflection printing ink color under visible light is all shown in green, and two ink colors aberration show as INFRARED ABSORPTION and infrared external reflection less than 3% respectively at infrared region; Simultaneously, INFRARED ABSORPTION printing ink has the soft magnetism feature, and infrared external reflection printing ink has the Hard Magnetic feature.
The infrared signature of this printing ink is similar to embodiment 1 with magnetic characteristic.Print the different piece of same pattern respectively, or respectively in product surface different parts printed information, INFRARED ABSORPTION printing ink and the consistent undistinguishable of infrared external reflection ink colors under visible light like this, and the visible and infrared external reflection ink logo of INFRARED ABSORPTION ink logo is hardly as seen under infrared identification instrument, and it is machine-readable to utilize infrared signature and magnetic characteristic to carry out, and reaches the machine-readable purpose of composite anti-fake thus.
Embodiment 3
Adopt blue different spectrum magnetic pairing printing ink to print anti-fake product.
Below prescription is the screen printing ink prescription
The prescription infrared external reflection ink formulations of INFRARED ABSORPTION printing ink
Ni
2MnSn 20％ SrFe
9O
12 15％
Phthalocyanine blue 10% phthalocyanine blue 15%
Connect material 55% and connect material 55%
Auxiliary agent 5% auxiliary agent 5%
Soft magnetic materials Ni in the above-mentioned prescription
2MnSn alloy, hard magnetic material are strontium ferrite.Coloring pigment is for providing the conventional pigment of the painted usefulness of printing ink, for example, and the phthalocyanine blue serial pigment.
The different spectrum magnetic pairing of this blueness printing ink is to be composed of by INFRARED ABSORPTION printing ink and infrared external reflection printing ink, INFRARED ABSORPTION printing ink and infrared external reflection printing ink color under visible light all is shown as blueness, and two ink colors aberration show as INFRARED ABSORPTION and infrared external reflection less than 3% respectively at infrared region; Simultaneously, INFRARED ABSORPTION printing ink has the soft magnetism feature, and infrared external reflection printing ink has the Hard Magnetic feature.
The infrared signature of this printing ink is similar to embodiment 1 with magnetic characteristic.Adopt cover to be imprinted on product surface and print relevant information, INFRARED ABSORPTION printing ink and the consistent undistinguishable of infrared external reflection ink colors under visible light like this, and the visible and infrared external reflection ink logo of INFRARED ABSORPTION ink logo is hardly as seen under infrared identification instrument, and it is machine-readable to utilize infrared signature and magnetic characteristic to carry out, and reaches the purpose of anti-fake machine reading thus.
Claims (12)
1. realize false proof method for one kind, it is characterized in that this method selects magnetic characteristic and infrared signature two kinds of magnetic inks all inequality to form metamerism magnetic pairing printing ink, prints the pattern that can be used as anti-counterfeiting information respectively on the same carrier of undertaking the printing of.
2. method according to claim 1, it is characterized in that, two kinds of printing ink forming metamerism magnetic pairing printing ink are all visible and color is closely little in the visible region, but under the setting wave band of infrared light region, a kind of printing ink has the INFRARED ABSORPTION performance, and another kind of printing ink then has properties of infrared reflection.
3. method according to claim 2 is characterized in that, the absolute value of the ir-absorbance of described pairing printing ink or the difference of infrared reflectivity is greater than 15%.
4. method according to claim 1 and 2, it is characterized in that, two kinds of printing ink forming metamerism magnetic pairing printing ink have different magnetic characteristics, show that the printing ink of INFRARED ABSORPTION has soft magnetism or semihard magnetic feature, show that the printing ink of infrared external reflection then has the Hard Magnetic feature.
5. method according to claim 4 is characterized in that, described Hard Magnetic is characterized as: residual induction is greater than 10emu/g, coercivity at 100 oersteds between 1000 oersteds; Described soft magnetism or semihard magnetic are characterized as: residual induction is less than 10emu/g, and coercivity is less than 100 oersteds.
6. method according to claim 1 is characterized in that, the method for patterning of printing as anti-counterfeiting information on the carrier of undertaking the printing of comprises: two kinds of printing ink are applied to the different piece of same pattern; The imprint of two kinds of printing ink is distributed in the different pattern of the carrier of undertaking the printing of; Perhaps, the pattern that adopts a kind of printing ink to print is included in the pattern of the another kind of printing ink printing of matching with it.
7. method according to claim 1 is characterized in that, the infrared signature and the magnetic characteristic of described metamerism magnetic pairing printing ink all can be realized anti-fake machine reading.
8. according to claim 1,2,6 or 7 described methods, it is characterized in that two kinds of printing ink of described composition metamerism magnetic pairing printing ink are all visible in the visible region to be homochromy also, and the aberration of two kinds of ink colors is less than 3%.
9. method according to claim 1 is characterized in that, described metamerism magnetic pairing printing ink comprises gravure ink, letterpress printing ink, offset ink, ink-jet or screen printing ink.
10. method according to claim 1 is characterized in that, the described carrier of undertaking the printing of comprises paper substrate, PVC material or glass.
11. an anti-counterfeiting product, it has the anti-counterfeiting information of printing according to each described method of claim 1-10.
12. anti-counterfeiting product according to claim 11, it comprises: marketable securities, bill, documentary evidence or anti-false wittness card.
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| CN103509379A (en) * | 2013-09-24 | 2014-01-15 | 惠州市华阳光学技术有限公司 | Sheet-like magnetic infrared pigment and preparation method thereof |
| CN103593903A (en) * | 2012-08-17 | 2014-02-19 | 中钞特种防伪科技有限公司 | Anti-counterfeiting element and product using same |
| CN103770489A (en) * | 2014-02-27 | 2014-05-07 | 深圳市法兰文化产业有限公司 | Printing method of color image for anti-counterfeiting |
| CN103895379A (en) * | 2012-12-28 | 2014-07-02 | 中国人民银行印制科学技术研究所 | Anti-counterfeiting pattern manufacturing method and product with anti-counterfeiting pattern |
| CN104316469A (en) * | 2014-10-29 | 2015-01-28 | 永发印务(东莞)有限公司 | Printing spectrum color-separating method facing to metamerism anti-fake |
| CN105131718A (en) * | 2015-09-16 | 2015-12-09 | 永发印务(东莞)有限公司 | Anti-counterfeiting metamerism ink as well as preparation method and printing method of anti-counterfeiting metamerism ink |
| CN106349809A (en) * | 2016-11-07 | 2017-01-25 | 上海印钞有限公司 | Infrared absorption-nonabsorption paired carving gravure ink |
| CN108602370A (en) * | 2016-02-25 | 2018-09-28 | 大日本印刷株式会社 | The combination of hot transfer piece and transfer printing body and the forming method of photographic printed material and hot transfer piece |
| CN109572258A (en) * | 2018-12-21 | 2019-04-05 | 北京印刷学院 | The stealthy infrared complementary identification dimension code anti-counterfeit method of pseudo-code |
| CN109726787A (en) * | 2018-12-21 | 2019-05-07 | 北京信息科技大学 | Page stealth multi-code complementation pharmaceutical products package anti-counterfeiting method |
| CN109726789A (en) * | 2018-12-21 | 2019-05-07 | 北京印刷学院 | Hide the anti-fake two-dimension code of digital signature |
| CN109754042A (en) * | 2018-12-21 | 2019-05-14 | 北京信息科技大学 | Trademark image stealth identification and false proof method |
| CN114574028A (en) * | 2022-02-22 | 2022-06-03 | 惠州市华阳光学技术有限公司 | Anti-counterfeiting pigment composition and preparation method thereof |
| CN114664171A (en) * | 2022-02-22 | 2022-06-24 | 惠州市华阳光学技术有限公司 | Magnetic infrared anti-counterfeiting pigment |
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| CN103593903A (en) * | 2012-08-17 | 2014-02-19 | 中钞特种防伪科技有限公司 | Anti-counterfeiting element and product using same |
| CN103895379B (en) * | 2012-12-28 | 2016-04-27 | 中国人民银行印制科学技术研究所 | The manufacture method of security pattern and there is the product of security pattern |
| CN103895379A (en) * | 2012-12-28 | 2014-07-02 | 中国人民银行印制科学技术研究所 | Anti-counterfeiting pattern manufacturing method and product with anti-counterfeiting pattern |
| CN103509379B (en) * | 2013-09-24 | 2014-11-05 | 惠州市华阳光学技术有限公司 | Sheet-like magnetic infrared pigment and preparation method thereof |
| CN103509379A (en) * | 2013-09-24 | 2014-01-15 | 惠州市华阳光学技术有限公司 | Sheet-like magnetic infrared pigment and preparation method thereof |
| CN103770489A (en) * | 2014-02-27 | 2014-05-07 | 深圳市法兰文化产业有限公司 | Printing method of color image for anti-counterfeiting |
| CN104316469A (en) * | 2014-10-29 | 2015-01-28 | 永发印务(东莞)有限公司 | Printing spectrum color-separating method facing to metamerism anti-fake |
| CN105131718A (en) * | 2015-09-16 | 2015-12-09 | 永发印务(东莞)有限公司 | Anti-counterfeiting metamerism ink as well as preparation method and printing method of anti-counterfeiting metamerism ink |
| CN108602370A (en) * | 2016-02-25 | 2018-09-28 | 大日本印刷株式会社 | The combination of hot transfer piece and transfer printing body and the forming method of photographic printed material and hot transfer piece |
| CN106349809B (en) * | 2016-11-07 | 2019-09-03 | 上海印钞有限公司 | A kind of non-absorbing pairing engraving intaglio printing ink of infrared absorption- |
| CN106349809A (en) * | 2016-11-07 | 2017-01-25 | 上海印钞有限公司 | Infrared absorption-nonabsorption paired carving gravure ink |
| CN109572258A (en) * | 2018-12-21 | 2019-04-05 | 北京印刷学院 | The stealthy infrared complementary identification dimension code anti-counterfeit method of pseudo-code |
| CN109726789A (en) * | 2018-12-21 | 2019-05-07 | 北京印刷学院 | Hide the anti-fake two-dimension code of digital signature |
| CN109754042A (en) * | 2018-12-21 | 2019-05-14 | 北京信息科技大学 | Trademark image stealth identification and false proof method |
| CN109726787A (en) * | 2018-12-21 | 2019-05-07 | 北京信息科技大学 | Page stealth multi-code complementation pharmaceutical products package anti-counterfeiting method |
| CN109726789B (en) * | 2018-12-21 | 2023-06-27 | 北京印刷学院 | Anti-fake two-dimensional code with hidden digital signature |
| CN114574028A (en) * | 2022-02-22 | 2022-06-03 | 惠州市华阳光学技术有限公司 | Anti-counterfeiting pigment composition and preparation method thereof |
| CN114664171A (en) * | 2022-02-22 | 2022-06-24 | 惠州市华阳光学技术有限公司 | Magnetic infrared anti-counterfeiting pigment |
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