JP2000293729A - Method and apparatus for mechanically discriminating authenticity printed matter - Google Patents
Method and apparatus for mechanically discriminating authenticity printed matterInfo
- Publication number
- JP2000293729A JP2000293729A JP9811799A JP9811799A JP2000293729A JP 2000293729 A JP2000293729 A JP 2000293729A JP 9811799 A JP9811799 A JP 9811799A JP 9811799 A JP9811799 A JP 9811799A JP 2000293729 A JP2000293729 A JP 2000293729A
- Authority
- JP
- Japan
- Prior art keywords
- ink
- light
- printed matter
- wavelength
- metameric pair
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Accessory Devices And Overall Control Thereof (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
Abstract
(57)【要約】
【課題】 真偽判別方法が目視判別に限られていたメタ
メリックペア印刷物を、誰もがより簡単に真偽判別でき
るようにする方法及びその装置を提供する。
【解決手段】 波長１、波長２の近赤外線を投光する投
光部、フォトダイオードで近赤外線の反射光又は透過光
を受光し、アンプで出力電流の増幅及び電圧への変換を
行う受光部、２つの出力電圧を比較して判別結果を表示
する演算部を備えた機械的判別装置によってメタメリッ
クペア印刷物の真偽判別を行い、メタメリックインキで
ある第１インキ及び第２インキの近赤外線領域における
性質を応用し、第１インキにおいて波長１の出力電圧は
波長２より大きく十分な差があり、第２インキにおいて
両方の出力電圧は等しく、波長１の出力電圧は第１イン
キ及び第２インキ共に等しいという３つの判別条件を満
たせば、真正なメタメリックペア印刷物であると判別す
る。
(57) [Summary] [Problem] To provide a method and an apparatus for allowing anyone to more easily determine the authenticity of a metameric pair printed matter whose authenticity determination method is limited to visual identification. SOLUTION: A light projecting unit that projects near-infrared light of wavelengths 1 and 2, a light-receiving unit that receives reflected light or transmitted light of near-infrared light by a photodiode, and amplifies an output current and converts it to a voltage by an amplifier. The authenticity of the metameric pair printed matter is determined by a mechanical determination device having a calculation unit that compares the two output voltages and displays the determination result, and the near-infrared light of the first ink and the second ink that are the metameric inks Applying the properties in the area, the output voltage of wavelength 1 in the first ink is larger than the wavelength 2 and has a sufficient difference, the output voltages of both are equal in the second ink, and the output voltage of wavelength 1 is the first and second inks. If the three determination conditions that the inks are equal are satisfied, it is determined that the printed matter is a genuine metameric pair print.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、偽造防止を必要と
する真偽判別印刷物を、機械的に判別する方法及びその
装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for mechanically discriminating a printed matter which needs to be prevented from forgery.
【０００２】[0002]
【従来の技術】銀行券や証券等の偽造防止を必要とする
印刷物において、インキの機能を利用して真偽を判別し
偽造防止を図る技術分野があり、真偽判別の方法として
は、目視により判別する方法と、機械により判別する方
法がある。2. Description of the Related Art There is a technical field for discriminating the authenticity of printed matter such as banknotes and securities which requires forgery prevention by using the function of ink to prevent forgery. There is a method of determining by using a method and a method of determining by using a machine.
【０００３】この技術分野の中で目視により真偽を判別
する技術として、照明する光源を適当に選択することに
より、該色料群が同色に見えたり、異なった色に見える
ことを利用した画像形成体（特公昭６０−５８７１１
号）がある。この印刷物に使用される２種類のインキは
条件等色の特徴を持つインキであり、インキに含まれる
顔料の性質により通常光下では等色に見えるが、異なる
光源を使用したり色フィルターを通して見ると異なった
色に見え、またカラー複写機や写真でも異なる色に再現
され、この作用により目視による印刷物の真偽判別が可
能になる。しかし、目視による真偽判別では異なる光源
やフィルターを用意したり、カラー複写機で再現性を確
認する必要があり、確実性、利便性、即効性に欠けてい
た。また近年、証券類等の偽造防止を必要とする印刷物
が、自動販売機等で機械処理される機会が多くなってき
ているが、条件等色のインキの印刷物を、前記機械で判
別することは今まで困難であり、新しい機械的読み取り
による真偽判別方法の開発が望まれていた。As a technique for visually discriminating the authenticity in this technical field, an image utilizing the fact that the color material group looks the same or different colors by appropriately selecting a light source to be illuminated. Formed body (Japanese Patent Publication No. 60-58711)
No.). The two types of inks used in this printed matter are those having a characteristic of color matching, and appear to be color matching under normal light due to the nature of the pigment contained in the ink, but are viewed using a different light source or through a color filter. This color is reproduced in a different color from a color copier or a photograph, and this operation makes it possible to visually discriminate the authenticity of the printed matter. However, visual discrimination requires the preparation of different light sources and filters and the confirmation of reproducibility with a color copier, which lacks certainty, convenience, and immediate effect. Also, in recent years, printed materials that require security prevention, such as securities, have been increasingly machined by vending machines and the like. Until now, it has been difficult, and there has been a demand for the development of a new method for determining the authenticity by mechanical reading.
【０００４】また、インキの機能を利用して機械により
真偽を判別する技術として、基材上に赤外線を吸収する
インキを使用して不可視又は隠蔽した情報として印刷
し、赤外光の吸収を検知して真偽判別する方法がある
が、その機械による赤外線領域の検知だけではカーボン
ブラックを含む墨インキで印刷されている場合、可視領
域及び赤外線領域のいずれに対しても吸収して真正品と
判断してしまうため、これを確実に判定する方法とし
て、前記不可視又は隠蔽した情報部分に赤外光と可視光
を照射して、前記情報部分からの反射光のうち赤外光が
吸収され、可視光が反射していることで真正品と判断す
る方法（特開平８−１５３２３３号）、前記情報部分か
らの反射光を赤外光と可視光にそれぞれ区別して検知
し、赤外光からのみ情報が得られるものを真とし、赤外
光及び可視光の両方から、あるいは可視光からのみ情報
が得られるものを偽として判別する装置（特開平９−２
４５１１５号）がある。これらの方法では可視領域の情
報は除き、赤外領域の情報のみを判別できるように工夫
されているが、赤外線を吸収又は反射する領域を判別し
ていないため、異なる特性の赤外線吸収インキが付与さ
れたものでも真正品として誤判別する危険があり、銀行
券や証券等の貴重な印刷物の真偽判別方法としては完全
とは言えない。[0004] As a technique for discriminating the authenticity by a machine utilizing the function of ink, as a technique of printing as invisible or concealed information using ink that absorbs infrared rays on a base material, the absorption of infrared light is determined. There is a method of detecting and authenticity determination, but if the machine only detects the infrared region, if it is printed with black ink containing carbon black, it absorbs both visible and infrared regions and it is a genuine product Therefore, as a method of reliably determining this, irradiating the invisible or concealed information portion with infrared light and visible light, infrared light of the reflected light from the information portion is absorbed. A method of judging a genuine product by reflecting visible light (Japanese Patent Application Laid-Open No. 8-153233), detecting the reflected light from the information portion separately from infrared light and visible light, and detecting the reflected light from infrared light. Only information Are those was true, apparatus for determining what both infrared light and visible light or viewing information from the visible light, is obtained as false (JP-9-2
No. 45115). In these methods, information in the visible region is excluded, and information is devised so that only the information in the infrared region can be determined.However, since the region that absorbs or reflects infrared light is not determined, infrared absorbing ink having different characteristics is applied. However, there is a risk of misjudgment as a genuine product, and the method of judging the authenticity of valuable printed matter such as banknotes and securities is not perfect.
【０００５】[0005]
【発明が解決しようとする課題】本発明は上述の点に鑑
みなされたもので、目視による判別に限られていたとこ
ろの、条件等色のインキを使用したメタメリックペア印
刷物の真偽判別において、赤外光と可視光にそれぞれ区
別して検知する従来の方法とは異なり、本発明は２種類
の異なる波長の近赤外線を検出することにより、近赤外
線領域の光学特性が互いに異なる２種類のインキ、すな
わち赤外線吸収材料を含むインキと、近赤外線領域のみ
の領域において、異なった分光反射率特性を持つインキ
を３つの判別条件により判別できるようにし、個人の識
別能力に関係なく、誰もが簡単な方法で、より精度の高
い真偽判別を可能にする方法及びその装置を提供するこ
とを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has been limited to visual discrimination. In contrast to the conventional method of detecting infrared light and visible light separately, the present invention detects two types of near-infrared rays having different wavelengths, and thus, two kinds of inks having different optical characteristics in the near-infrared region. In other words, inks containing infrared absorbing materials and inks with different spectral reflectance characteristics in the near infrared region only can be distinguished by three criteria, making it easy for anyone, regardless of personal identification ability It is an object of the present invention to provide a method and an apparatus for enabling more accurate true / false judgment by a simple method.
【０００６】[0006]
【課題を解決するための手段】本発明の第１の発明は、
通常光下では等色に見え、異なる光源では異なる色に見
えるメタメリックペアインキにおいて、近赤外線領域の
光学特性が互いに異なる２種類の第１インキ及び第２イ
ンキを、基材上に相対して印刷して作製したメタメリッ
クペア印刷物の機械的判別方法であって、前記第１イン
キ及び第２インキにより印刷された前記メタメリックペ
ア印刷物に向けて、それぞれ異なる波長域を持つ波長１
及び波長２の２種類の近赤外線を投光する投光部と、前
記メタメリックペア印刷物からの２種類の近赤外線の反
射光又は透過光を受光し、それぞれの受光量に応じた電
圧を出力する受光部と、前記受光部からの２つの出力電
圧を比較して、前記第１インキの前記２種類の波長によ
る出力電圧の差があらかじめ設定したしきい値以上の差
を有し、前記第２インキの前記２種類の波長による出力
電圧が等しく、且つ前記波長１による近赤外線の投光に
よる前記メタメリックペア印刷物からの反射又は透過に
よる出力電圧が第１インキ及び第２インキにおいて等し
いことにより、メタメリックペア印刷物の真偽判別を行
うことを特徴とする真偽判別印刷物の機械的判別方法で
ある。Means for Solving the Problems A first invention of the present invention is:
Two types of first and second inks, which look similar under normal light and look different under different light sources, have different optical properties in the near-infrared region. A method for mechanically discriminating a metameric pair printed matter produced by printing, comprising: a wavelength 1 having a different wavelength range toward the metameric pair printed matter printed by the first ink and the second ink.
And a light emitting unit that emits two types of near-infrared rays having a wavelength of 2 and receives reflected light or transmitted light of two types of near-infrared rays from the printed metalic pair, and outputs a voltage corresponding to the amount of received light. And comparing the two output voltages from the light receiving unit, the difference between the output voltages at the two wavelengths of the first ink has a difference equal to or greater than a preset threshold value, The output voltages of the two inks at the two wavelengths are equal, and the output voltages of the first ink and the second ink are the same due to the reflection or transmission of the near-infrared light at the wavelength 1 from the printed or printed metameric pair. A mechanical discrimination method for authenticated printed matter, wherein the authenticity of the printed metameric pair is determined.
【０００７】本発明の第２の発明は、通常光下では等色
に見え、異なる光源では異なる色に見えるメタメリック
ペアインキにおいて、近赤外線領域の光学特性が互いに
異なる２種類の第１インキ及び第２インキを、基材上に
相対して印刷して作製したメタメリックペア印刷物の機
械的判別装置であって、前記第１インキ及び第２インキ
により印刷された前記メタメリックペア印刷物に向け
て、それぞれ異なる波長域を持つ波長１及び波長２の２
種類の近赤外線を投光する投光部と、前記メタメリック
ペア印刷物からの２種類の近赤外線の反射光又は透過光
を受光し、それぞれの受光量に応じた電圧を出力する受
光部と、前記受光部からの２つの出力電圧を比較して、
前記第１インキの前記２種類の波長による出力電圧の差
があらかじめ設定したしきい値以上の差を有し、前記第
２インキの前記２種類の波長による出力電圧が等しく、
且つ前記波長１による近赤外線の投光による前記メタメ
リックペア印刷物からの反射又は透過による出力電圧が
第１インキ及び第２インキにおいて等しいことにより、
メタメリックペア印刷物の真偽判別を行う演算部とを備
えた機械的判別装置により、前記メタメリックペア印刷
物の真偽判別を行うことを特徴とする、真偽判別印刷物
の機械的判別装置である。According to a second aspect of the present invention, there is provided a metameric pair ink which looks similar under normal light and looks different under different light sources. A mechanical discriminating apparatus for a metameric pair printed matter produced by printing a second ink on a substrate relative to the metameric pair printed matter printed by the first ink and the second ink. , Wavelengths 1 and 2 having different wavelength ranges, respectively.
A light-emitting unit that emits near-infrared rays of a type, a light-receiving unit that receives reflected light or transmitted light of two types of near-infrared rays from the printed metalic pair, and outputs a voltage corresponding to the amount of received light, By comparing two output voltages from the light receiving unit,
The difference between the output voltages of the first ink at the two wavelengths has a difference equal to or greater than a preset threshold value, and the output voltages of the second ink at the two wavelengths are equal,
And output voltages due to reflection or transmission from the printed metalic pair by the near-infrared light with the wavelength 1 are equal in the first ink and the second ink,
A mechanical discriminating apparatus including a calculation unit that performs authenticity discrimination of the metameric pair printed matter, wherein the authenticity of the metameric pair printed matter is judged by the mechanical discriminating apparatus. .
【０００８】本発明の第３の発明は、請求項１記載の２
種類のインキが、近赤外線領域の一部を吸収する前記第
１インキと、近赤外線領域の分光反射率が一定である前
記第２インキであることを特徴とする真偽判別印刷物の
機械的判別方法である。According to a third aspect of the present invention, there is provided the second aspect of the present invention.
Wherein the two types of inks are the first ink absorbing a part of the near infrared region and the second ink having a constant spectral reflectance in the near infrared region. Is the way.
【０００９】本発明の第４の発明は、請求項２記載の２
種類のインキが、特定の近赤外線領域を吸収する前記第
１インキと、近赤外線領域の分光反射率が一定である前
記第２インキであることを特徴とする真偽判別印刷物の
機械的判別装置である。According to a fourth aspect of the present invention, there is provided the second aspect of the present invention.
A mechanical discrimination device for authenticity discrimination printed matter, wherein the first kind of ink absorbs a specific near-infrared region and the second ink has a constant near-infrared region spectral reflectance. It is.
【００１０】[0010]
【発明の実施の形態】本発明は、通常光下では等色に見
え、異なる光源では異なる色に見える条件等色インキ、
すなわちメタメリックペアインキにおいて、近赤外線領
域の光学特性が相互に異なる２種類の第１インキ及び第
２インキを、基材上に相対して印刷して作製したメタメ
リックペア印刷物を作製し、前記メタメリックペア印刷
物に向けて、それぞれ異なる波長域を持つ波長１及び波
長２の２種類の近赤外線を投光する投光部と、前記メタ
メリックペア印刷物上で反射、又は前記メタメリックペ
ア印刷物を透過した２種類の近赤外線の反射光又は透過
光を受光し、それぞれの受光量に応じた電圧を出力する
受光部と、前記受光部からの２つの出力電圧を比較し
て、前記第１インキの前記２種類の波長による出力電圧
の差があらかじめ設定したしきい値以上の差を有し、前
記第２インキの前記２種類の波長による出力電圧が等し
く、且つ前記波長１による近赤外線の投光による前記メ
タメリックペア印刷物からの反射又は透過による出力電
圧が第１インキ及び第２インキにおいて等しいことによ
り、メタメリックペア印刷物の真偽判別を行う演算部と
を備えた機械的判別装置により、判別条件にすべて適合
するものを真正物、１つでも判別条件に適合しないもの
を偽造物とする、メタメリックペア印刷物の機械的判別
方法及びその装置である。なお、メタメリックペアイン
キの前記２種類のインキは、近赤外線領域の光学特性が
互いに異なる２種類の第１インキ及び第２インキを使用
する。また、２種類のＬＥＤ又はレーザで出力される２
種類の近赤外線を、前記メタメリックペア印刷物に投光
する投光部と、前記メタメリックペア印刷物からそれぞ
れ反射又は透過した近赤外線を、２種類のフォトダイオ
ードで受光する受光部及び前記２種類のフォトダイオー
ドから出力された電流を、アンプで増幅した後出力電圧
に変換し、前記２つの出力電圧の比較演算を行う演算部
を有する前記機械的判別装置により、前記第１インキの
前記２種類の波長による出力電圧の差がしきい値以上の
差を有し、前記第２インキの前記２種類の波長による出
力電圧が等しく、且つ前記波長１による近赤外線の投光
による前記メタメリックペア印刷物からの反射又は透過
による出力電圧が、第１インキ及び第２インキにおいて
等しいことにより印刷物の真偽判別を行う。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a conditionally color matching ink which looks normal under normal light and looks different under different light sources.
That is, in a metameric pair ink, two types of first ink and second ink having optical properties different from each other in the near infrared region are mutually printed on the base material to produce a metameric pair printed matter, Toward the metameric pair printed matter, a light projecting unit that emits two types of near-infrared rays of wavelength 1 and wavelength 2 having different wavelength ranges, and reflection on the metameric pair printed matter, or the metameric pair printed matter A light receiving unit that receives two types of transmitted near-infrared reflected light or transmitted light and outputs a voltage corresponding to the amount of each received light, and compares two output voltages from the light receiving unit to obtain the first ink. The difference between the output voltages of the two wavelengths is equal to or greater than a preset threshold value, the output voltages of the second ink of the two wavelengths are equal, and the wavelength 1 And a computing unit for determining whether the metameric pair printed matter is true or false by making the output voltages of the first ink and the second ink equal by reflection or transmission from the printed matter printed by the near-infrared light. A mechanical discriminating method for a metameric pair printed matter and an apparatus therefor, wherein a thing that satisfies all of the discriminating conditions is regarded as a genuine one and a thing that does not conform to the discriminating condition is forged. The two types of inks of the metameric pair ink use two types of first ink and second ink having different optical characteristics in the near infrared region. In addition, two types of LED or laser output
A kind of near-infrared light, a light-emitting unit that projects light onto the metameric pair printed matter, a light-receiving part that receives near-infrared light reflected or transmitted from the metameric pair printed matter by two kinds of photodiodes, and the two kinds of near infrared rays, respectively. The current output from the photodiode is converted into an output voltage after being amplified by an amplifier, and the two types of the first ink are converted by the mechanical discriminator having a calculation unit that performs a comparison calculation of the two output voltages. The output voltage difference according to the wavelength has a difference equal to or greater than a threshold value, the output voltage according to the two types of wavelengths of the second ink is equal, and The output voltage due to the reflection or transmission of the first ink and the second ink is equal to each other, so that the authenticity of the printed matter is determined.
【００１１】以下に本発明を実施例によって詳細に説明
するが、本発明の技術思想の範囲であれば、実施例によ
って何ら限定されるものではない。Hereinafter, the present invention will be described in detail with reference to examples, but the examples are not intended to limit the scope of the present invention.
【００１２】通常光下で等色に見えるメタメリックペア
インキの２種類のインキのうち、近赤外線領域の一部を
吸収するインキを第１インキとし、近赤外線領域の分光
反射率がほぼ一定となるインキを第２インキとする。第
１インキとして、コバルト系化合物と有機系色顔料を組
み合わせて、1200〜1400nmの近赤外線を吸収するインキ
とし、第２インキとして、有機系色顔料を組み合わせて
近赤外線領域において分光反射率がほぼ一定のインキと
する。２種類のインキは互いに近赤外線領域の分光反射
率が異なる組み合わせであれば、他の材料を組み合わせ
たインキでも良い。[0012] Of the two types of metameric pair inks that look the same color under normal light, the ink that absorbs part of the near infrared region is the first ink, and the spectral reflectance in the near infrared region is almost constant. The resulting ink is referred to as a second ink. As the first ink, a cobalt compound and an organic color pigment are combined to form an ink that absorbs near-infrared light of 1200 to 1400 nm. As the second ink, an organic color pigment is combined to have a spectral reflectance in the near infrared region. Use a constant ink. As long as the two types of inks are combinations having different spectral reflectances in the near-infrared region, inks combining other materials may be used.
【００１３】近赤外線領域の特定波長域に吸収がある材
料として、インジウム系化合物、ジルコニウム系化合
物、アントラキノン系化合物、コバルト系化合物、フタ
ロシアニン系化合物等があり、近赤外線領域で発光する
材料にはLiAlO２:Fe、(Zn・Cd)S:Cu、YVO４:Nd等があ
る。Materials that absorb in a specific wavelength region in the near infrared region include indium compounds, zirconium compounds, anthraquinone compounds, cobalt compounds, phthalocyanine compounds, and the like. 2 : Fe, (Zn · Cd) S: Cu, YVO 4 : Nd and the like.
【００１４】以下の実施例では、近赤外線の反射光を受
光する機械的判別方法を示すが、透過光を受光する機械
的判別方法でも可能である。また、２種類の近赤外線を
出力する方法としてＬＥＤがあるが、一方又は両方にレ
ーザを使用する方法、手段もある。In the following embodiment, a mechanical discrimination method for receiving reflected light of near-infrared rays is shown, but a mechanical discrimination method for receiving transmitted light is also possible. In addition, there is an LED as a method of outputting two types of near-infrared rays, but there is also a method or means using a laser for one or both.
【００１５】図１はメタメリックペア印刷物（Ｐ）で、
基材である上質紙（ｐ）上に第１インキの印刷部（１）
と第２インキの印刷部（２）が印刷されている。FIG. 1 shows a printed metameric pair (P).
Printing part (1) of first ink on high quality paper (p) as a base material
And a printing portion (2) of the second ink.
【００１６】図２は第１インキの印刷部（１）の分光反
射率曲線（３）、第２インキの印刷部（２）の分光反射
率曲線（４）及び上質紙（ｐ）の分光反射率曲線（５）
を示した図である。第１インキは横軸における波長１の
近赤外線の反射率が高く、横軸における波長２の近赤外
線の反射率が低い。第２インキは波長１及び波長２の近
赤外線の反射率がほぼ等しい特徴を有しており、これら
の特徴に基づいて後述の判別条件と比較して真偽判別を
行う。FIG. 2 shows the spectral reflectance curve (3) of the printing section (1) of the first ink, the spectral reflectance curve (4) of the printing section (2) of the second ink, and the spectral reflection of the high quality paper (p). Rate curve (5)
FIG. The first ink has a high reflectance of near-infrared light of wavelength 1 on the horizontal axis and a low reflectance of near-infrared light of wavelength 2 on the horizontal axis. The second ink has a feature that the reflectances of the near infrared rays having the wavelengths 1 and 2 are substantially equal, and the authenticity is determined based on these features by comparing with a determination condition described later.
【００１７】図３は図１のメタメリックペア印刷物
（Ｐ）の真偽判別を行う機械的判別装置（Ａ）の構成を
示した図である。機械的判別装置（Ａ）の投光部には前
記波長１、波長２の２種類のＬＥＤを設け、メタメリッ
クペア印刷物（Ｐ）に投光する。波長１のＬＥＤはピー
ク波長900nm 付近の近赤外線を発光し、波長２のＬＥＤ
はピーク波長1300nm付近の近赤外線を発光する。図１の
メタメリックペア印刷物（Ｐ）の第１インキの印刷部
（１）及び第２インキの印刷部（２）で反射した前記２
種類の近赤外線は、受光部に設けたそれぞれの波長の近
赤外線に反応する２種類のフォトダイオードに受光され
る。近赤外線の投、受光は波長別に光ファイバーを通じ
て行う。２種類のフォトダイオードは、２種類の近赤外
線が第１インキの印刷部（１）及び第２インキの印刷部
（２）で反射した近赤外線の受光量に応じた電流を出力
し、電流はアンプで増幅されて電圧に変換し演算部
（Ｃ）に出力する。演算部（Ｃ）では、第１インキの印
刷部（１）及び第２インキの印刷部（２）に対応したそ
れぞれの電圧を比較して、比較結果をあらかじめ設定し
たしきい値及び設定値と照合して真偽判別を行う。FIG. 3 is a diagram showing the structure of a mechanical discriminating apparatus (A) for discriminating the authenticity of the printed metameric pair (P) shown in FIG. The light emitting portion of the mechanical discriminating device (A) is provided with the two kinds of LEDs of the wavelength 1 and the wavelength 2, and emits light to the metameric pair printed matter (P). The LED of wavelength 1 emits near-infrared light near the peak wavelength of 900 nm, and the LED of wavelength 2
Emits near-infrared light having a peak wavelength of about 1300 nm. In the metameric pair printed matter (P) shown in FIG. 1, the above-mentioned 2 reflected on the printing portion (1) of the first ink and the printing portion (2) of the second ink.
The two types of near-infrared rays are received by two types of photodiodes provided in the light receiving unit that respond to the near-infrared rays of the respective wavelengths. Near-infrared light is emitted and received through optical fibers for each wavelength. The two types of photodiodes output currents corresponding to the amounts of near-infrared rays received by the two types of near-infrared rays reflected on the printing portion (1) of the first ink and the printing portion (2) of the second ink. The signal is amplified by an amplifier, converted into a voltage, and output to a calculation unit (C). The calculation unit (C) compares respective voltages corresponding to the printing unit (1) of the first ink and the printing unit (2) of the second ink, and compares the comparison result with a preset threshold value and set value. Collation is performed to determine the authenticity.
【００１８】図２に示すように、波長１の近赤外線の反
射率は第１インキ及び第２インキではほぼ等しく、波長
２の近赤外線の反射率は第２インキに比べて第１インキ
の方が低い。このため第１インキの印刷部（１）におい
て、フォトダイオードにより変換された波長２の出力電
圧が波長１の出力電圧より小さくなり、波長１の出力電
圧と差が生じる。しかし、メタメリックペア印刷物
（Ｐ）の複写物に使用される黒色以外のインキや、カラ
ーコピーのトナーには、特定の波長領域の近赤外線を吸
収する性質がないため、両方のインキの印刷部において
波長１及び波長２の出力電圧がほぼ等しくなる。これら
のことから、第１インキの印刷部（１）にあたる箇所を
読み取り、波長１の出力電圧が波長２の出力電圧より大
きく、設定したしきい値以上の差を有していれば、読み
取り箇所において第１インキが使われていると判別でき
る［判別条件１］。しきい値は、複写物の電圧差波形の
最大値より大きい値とする。As shown in FIG. 2, the reflectance of the near-infrared ray of wavelength 1 is substantially equal in the first ink and the second ink, and the reflectance of the near-infrared ray of wavelength 2 is higher in the first ink than in the second ink. Is low. Therefore, in the printing section (1) of the first ink, the output voltage of the wavelength 2 converted by the photodiode becomes smaller than the output voltage of the wavelength 1, and a difference occurs from the output voltage of the wavelength 1. However, the non-black ink used in the copy of the metameric pair print (P) and the color copy toner do not have the property of absorbing near-infrared rays in a specific wavelength region. , The output voltages of wavelengths 1 and 2 become substantially equal. From these, the portion corresponding to the printing portion (1) of the first ink is read, and if the output voltage of wavelength 1 is higher than the output voltage of wavelength 2 and has a difference equal to or greater than the set threshold value, Can be determined that the first ink is used [determination condition 1]. The threshold value is set to a value larger than the maximum value of the voltage difference waveform of the copy.
【００１９】次に、第２インキは、図２に示すように波
長１と波長２の分光反射率がほぼ等しいため、波長１及
び波長２の出力電圧の差はほとんどない。また、第２イ
ンキの印刷部（２）においての波長１の分光反射率は第
１インキの印刷部（１）と等しく、近赤外線領域におい
て第１インキと第２インキの分光反射率が同じになるの
は波長１付近のみである。従って、第２インキの印刷部
（２）にあたる箇所を読み取り、第２インキの波長１と
波長２の出力電圧が等しく［判別条件２］、且つ波長１
の出力電圧が第１インキ及び第２インキにおいて等しい
［判別条件３］という２つの条件を前記判別条件１と合
わせて、３つの判別条件をすべて満たせば、前記メタメ
リックペア印刷物（Ｐ）であると判別できる。判別条件
２及び判別条件３において２つの値が等しいと判別する
方法は、２つの出力電圧の差が設定値の範囲内であるか
比較して行い、本発明においての設定値は約１Ｖとす
る。Next, as shown in FIG. 2, the second ink has almost the same spectral reflectance at wavelengths 1 and 2, so that there is almost no difference between the output voltages at wavelengths 1 and 2. In addition, the spectral reflectance of wavelength 1 in the printing portion (2) of the second ink is equal to that of the printing portion (1) of the first ink, and the spectral reflectances of the first ink and the second ink in the near infrared region are the same. Only around the wavelength 1. Therefore, the portion corresponding to the printing portion (2) of the second ink is read, and the output voltages of the second ink at wavelengths 1 and 2 are equal [determination condition 2] and the wavelength 1
If the two output conditions are the same for the first ink and the second ink, the two conditions of [determination condition 3] and the determination condition 1 are satisfied, and if all three determination conditions are satisfied, the metameric pair print (P) is obtained. Can be determined. The method of determining that the two values are equal in the determination conditions 2 and 3 is performed by comparing whether the difference between the two output voltages is within the range of the set value, and the set value in the present invention is about 1V. .
【００２０】本実施例の演算部（Ｃ）においての真偽判
別方法のフローチャートを図４に示す。第１インキの読
み取り（ステップＳ１）及び第２インキの読み取り（ス
テップＳ２）を行い、各インキの波長１及び波長２の出
力電圧を測定する。第１インキにおいての波長１の出力
電圧と波長２の出力電圧の差を求め（ステップＳ３）、
しきい値以下であれば偽造物とし（ステップＳ７）、し
きい値以上であればステップＳ４へ進む。FIG. 4 shows a flowchart of a method for determining the authenticity in the arithmetic section (C) of this embodiment. The reading of the first ink (Step S1) and the reading of the second ink (Step S2) are performed, and the output voltage of each ink at wavelength 1 and wavelength 2 is measured. The difference between the output voltage of wavelength 1 and the output voltage of wavelength 2 in the first ink is obtained (step S3),
If it is less than the threshold value, it is determined to be a forgery (step S7). If it is more than the threshold value, the process proceeds to step S4.
【００２１】次に、ステップＳ４で第２インキにおいて
の波長１の出力電圧及び波長２の出力電圧の差を求め、
設定値以上の差の場合は偽造物とし（ステップＳ７）、
設定値以下の差の場合はステップＳ５へ進む。Next, in step S4, the difference between the output voltage at wavelength 1 and the output voltage at wavelength 2 for the second ink is determined.
If the difference is greater than the set value, it is determined to be a forgery (step S7),
If the difference is equal to or smaller than the set value, the process proceeds to step S5.
【００２２】次に、ステップＳ５で第１インキ及び第２
インキにおいての波長１の出力電圧の差を求め、設定値
以上の差の場合は偽造物とし（ステップＳ７）、設定値
以下の差の場合は真正物とする（ステップＳ６）。Next, in step S5, the first ink and the second ink
The difference between the output voltages at wavelength 1 in the ink is determined. If the difference is equal to or larger than the set value, it is determined to be a forgery (step S7), and if the difference is equal to or smaller than the set value, it is determined to be authentic (step S6).
【００２３】図５は、図１の前記メタメリックペア印刷
物（Ｐ）を機械的読み取りして得られた波長１の出力電
圧波形(6a)、波長２の出力電圧波形(7a)［図５（１）］
及びこれらの波長における電圧差波形(8a)［図５
（２）］である。第１インキの測定箇所（９）において
波長２の出力電圧(7a)が波長１の出力電圧(6a)より小さ
くなり、電圧差がしきい値以上になるため、判別条件１
を満たす。第２インキの測定箇所(10)において、波長１
の出力電圧(6a)及び波長２の出力電圧(7a)はほぼ等し
く、電圧差が０Ｖに近くなるため、判別条件２を満た
す。また、第１インキの印刷部（１）及び第２インキの
印刷部（２）においての波長１の出力電圧(6a)は等しい
ため、判別条件３を満たす。前記の判別条件をすべて満
たすことから前記メタメリックペア印刷物（Ｐ）である
と判別できる。FIG. 5 shows the output voltage waveform (6a) of wavelength 1 and the output voltage waveform (7a) of wavelength 2 obtained by mechanically reading the metameric pair printed matter (P) of FIG. 1 [FIG. 1)]
And the voltage difference waveforms at these wavelengths (8a) [FIG.
(2)]. At the measurement point (9) of the first ink, the output voltage (7a) of the wavelength 2 becomes smaller than the output voltage (6a) of the wavelength 1, and the voltage difference becomes larger than the threshold value.
Meet. At the measurement point (10) of the second ink, the wavelength 1
And the output voltage (7a) of wavelength 2 are almost equal, and the voltage difference is close to 0 V, so that the determination condition 2 is satisfied. Further, the output voltage (6a) of the wavelength 1 in the printing section (1) of the first ink and the printing section (2) of the second ink are equal, and thus the determination condition 3 is satisfied. Since all of the above-mentioned determination conditions are satisfied, it can be determined that the printed matter is the metameric pair printed matter (P).
【００２４】図６は図１の前記メタメリックペア印刷物
（Ｐ）の複写物［Ｐ’（図示せず）］をカラー複写機で
作製し、機械的読み取りして得られた波長１の出力電圧
波形(6b)、波長２の出力電圧波形(7b)［図６（１）］及
びこれらの波長における電圧差波形(8b)［図６（２）］
である。第１インキの測定箇所（９）において、波長１
の出力電圧(6b)及び波長２の出力電圧(7b)はほとんど等
しく、その差がしきい値以下であるため、判別条件１を
満たさないことがわかる。黒色トナーを含んで印刷され
た場合、第２インキの測定箇所(10)において波長１の出
力電圧(6b)及び波長２の出力電圧(7b)は等しく、電圧差
が０Ｖに近いので判別条件２を満たすが、波長１の出力
電圧(6b)は第１インキの印刷部（１）及び第２インキの
印刷部（２）では差があり、判別条件３を満たさない。
以上のことから、判別条件１及び判別条件３を満たして
いないため、複写物であると判別できる。FIG. 6 shows an output voltage of wavelength 1 obtained by making a copy [P ′ (not shown)] of the printed matter (P) shown in FIG. 1 with a color copying machine and mechanically reading it. Waveform (6b), output voltage waveform at wavelength 2 (7b) [FIG. 6 (1)] and voltage difference waveform (8b) at these wavelengths [FIG. 6 (2)]
It is. At the measurement point (9) of the first ink, the wavelength 1
And the output voltage (7b) of the wavelength 2 are almost equal, and the difference is equal to or less than the threshold value. When printing is performed with black toner, the output voltage (6b) of wavelength 1 and the output voltage (7b) of wavelength 2 are equal at the measurement point (10) of the second ink, and the voltage difference is close to 0 V. However, the output voltage (6b) of wavelength 1 is different between the printing portion (1) of the first ink and the printing portion (2) of the second ink, and does not satisfy the determination condition 3.
From the above, since the determination condition 1 and the determination condition 3 are not satisfied, the copy can be determined.
【００２５】[0025]
【発明の効果】従来の条件等色のインキを使用したメタ
メリックペア印刷物の真偽判別は、光源やフィルター等
の機材を使用した目視による方法に限られていたが、本
発明の機械的判別方法及びその装置により、前記メタメ
リックペア印刷物の偽造防止技術において、機械装置に
よる方法が加わって新たな付加価値を生み出し、目視に
よる判別では機材の特性や、個人の識別能力の相違によ
り、判別結果の確実性に問題があったが、本発明は確実
に前記メタメリックペア印刷物の真偽判別ができるよう
になった。また、本発明の機械的判別方法及びその装置
では、真偽判別の対象とするインキの近赤外線領域の特
性に対応して、２種類の異なる波長の近赤外線を利用し
た装置により、前記条件等色のインキであるか否かを検
知する方法を採用しているため、従来の広い波長領域の
赤外光による検知方法、又は可視光及び赤外光の２波長
による検知方法よりも高度な検知が可能となり、近赤外
線領域全体を吸収するインキや特性の異なる近赤外線吸
収インキを判別することができる。The conventional method for determining the authenticity of a metameric pair print using a metameric ink has been limited to a visual method using equipment such as a light source and a filter. According to the method and the apparatus thereof, in the technology for preventing forgery of the printed metalic pair, a method by a mechanical device is added to create a new added value. However, according to the present invention, the authenticity of the printed metameric pair can be reliably determined. In the mechanical discrimination method and the apparatus thereof according to the present invention, the above-described conditions and the like are determined by using an apparatus using two kinds of near-infrared rays having different wavelengths in accordance with the properties of the ink to be authenticated in the near-infrared region. Because it uses a method to detect whether or not it is a color ink, detection is more advanced than the conventional detection method using infrared light in a wide wavelength range, or the detection method using two wavelengths of visible light and infrared light. This makes it possible to distinguish between an ink that absorbs the entire near-infrared region and a near-infrared absorbing ink having different characteristics.
【図１】 メタメリックペア印刷物を示す図。FIG. 1 is a view showing a metameric pair printed matter.
【図２】 メタメリックペア印刷物用インキ及び基材の
分光反射率曲線を示す図。FIG. 2 is a view showing a spectral reflectance curve of an ink for a metameric pair print and a substrate.
【図３】 本発明の機械的判別装置の構成を示すブロッ
ク図。FIG. 3 is a block diagram showing a configuration of a mechanical discrimination device of the present invention.
【図４】 本発明の真偽判別方法のフローチャート。FIG. 4 is a flowchart of the authenticity determination method of the present invention.
【図５】 メタメリックペア印刷物の両波長の出力電圧
波形図とメタメリックペア印刷物の電圧差波形図。FIG. 5 is an output voltage waveform diagram of both wavelengths of a metameric pair printed material and a voltage difference waveform diagram of the metameric pair printed material.
【図６】 複写物の両波長の出力電圧波形図と複写物の
電圧差波形図。FIG. 6 is an output voltage waveform diagram of both wavelengths of a copy and a voltage difference waveform diagram of the copy.
１ 第１インキの印刷部 ２ 第２インキの印刷部 ３ 第１インキの分光反射率曲線 ４ 第２インキの分光反射率曲線 ５ 基材（上質紙）の分光反射率曲線 ６ａ メタメリックペア印刷物の波長１の出力電圧
波形 ６ｂ 複写物の波長１の出力電圧波形 ７ａ メタメリックペア印刷物の波長２の出力電圧
波形 ７ｂ 複写物の波長２の出力電圧波形 ８ａ メタメリック印刷物の電圧差波形 ８ｂ 複写物の電圧差波形 ９ 第１インキの測定箇所 １０ 第２インキの測定箇所 Ｓ１〜７ ステップ Ｐ メタメリックペア印刷物 ｐ 基材（上質紙） Ａ 機械的判別装置 Ｃ 演算部DESCRIPTION OF SYMBOLS 1 Printing part of 1st ink 2 Printing part of 2nd ink 3 Spectral reflectance curve of 1st ink 4 Spectral reflectance curve of 2nd ink 5 Spectral reflectance curve of base material (high quality paper) 6a Metametric pair printed matter Output voltage waveform of wavelength 1 6b Output voltage waveform of wavelength 1 of the copy 7a Output voltage waveform of wavelength 2 of the metameric pair print 7b Output voltage waveform of wavelength 2 of the copy 8a Voltage difference waveform of metameric print 8b Voltage of the copy Difference waveform 9 Measurement point of 1st ink 10 Measurement point of 2nd ink S1-7 Step P Metameric pair printed matter p Base material (high quality paper) A Mechanical discriminator C Operation unit
───────────────────────────────────────────────────── フロントページの続き Ｆターム(参考） 2C061 CL10 2G051 AA34 AB11 AB20 BA06 BA08 BA10 BA20 CA02 CA07 CB01 CB02 CC17 EA08 EB01 EB02 2G059 AA05 BB10 CC20 EE01 EE02 EE12 FF06 GG01 GG02 GG03 HH01 HH06 JJ17 KK01 KK03 MM01 MM05 3E041 AA01 AA02 AA03 BA09 BB02 BB03 BB06 BC03 CA09 CB02 CB08 DB01 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 2C061 CL10 2G051 AA34 AB11 AB20 BA06 BA08 BA10 BA20 CA02 CA07 CB01 CB02 CC17 EA08 EB01 EB02 2G059 AA05 BB10 CC20 EE01 EE02 EE12 FF06 GG01 GG02 GG03 HH01 MM03 H0101 AA02 AA03 BA09 BB02 BB03 BB06 BC03 CA09 CB02 CB08 DB01
Claims (4)
は異なる色に見えるメタメリックペアインキにおいて、
近赤外線領域の光学特性が相互に異なる２種類の第１イ
ンキ及び第２インキを、基材上に相対して印刷して作製
したメタメリックペア印刷物の機械的判別方法であっ
て、前記第１インキ及び第２インキにより印刷された前
記メタメリックペア印刷物に向けて、それぞれ異なる波
長域を持つ波長１及び波長２の２種類の近赤外線を投光
する投光部と、前記メタメリックペア印刷物からの２種
類の近赤外線の反射光又は透過光を受光し、それぞれの
受光量に応じた電圧を出力する受光部とを備え、前記受
光部からの２つの出力電圧を比較して、前記第１インキ
の前記２種類の波長による出力電圧の差があらかじめ設
定したしきい値以上の差を有し、前記第２インキの前記
２種類の波長による出力電圧が等しく、且つ前記波長１
による近赤外線の投光による前記メタメリックペア印刷
物からの反射又は透過による出力電圧が、第１インキ及
び第２インキにおいて等しいことにより、メタメリック
ペア印刷物の真偽判別を行う機械的判別方法。Claims: 1. A metameric pair ink that appears to be of the same color under normal light and of a different color under different light sources.
A method for mechanically discriminating a metameric pair printed matter produced by printing two types of first ink and second ink having mutually different optical properties in the near infrared region on a substrate, wherein the first ink and the second ink are different from each other. A light projecting unit that emits two types of near-infrared rays of wavelengths 1 and 2 each having a different wavelength band toward the metameric pair printed matter printed with the ink and the second ink, and the metameric pair printed matter. A light receiving unit that receives reflected light or transmitted light of two types of near infrared rays and outputs a voltage corresponding to the amount of received light, compares two output voltages from the light receiving unit, The difference in output voltage between the two wavelengths of the ink has a difference equal to or greater than a predetermined threshold value, the output voltage of the second ink at the two wavelengths is equal, and the wavelength 1
A mechanical discrimination method for judging whether a metameric pair print is true or false by making the output voltages of the first ink and the second ink equal by reflection or transmission from the metameric pair print by the near-infrared light projection.
は異なる色に見えるメタメリックペアインキにおいて、
近赤外線領域の光学特性が互いに異なる２種類の第１イ
ンキ及び第２インキを、基材上に相対して印刷して作製
したメタメリックペア印刷物の機械的判別装置であっ
て、前記第１インキ及び第２インキにより印刷された前
記メタメリックペア印刷物に向けて、それぞれ異なる波
長域を持つ波長１及び波長２の２種類の近赤外線を投光
する投光部と、前記メタメリックペア印刷物からの２種
類の近赤外線の反射光又は透過光を受光し、それぞれの
受光量に応じた電圧を出力する受光部と、前記受光部か
らの２つの出力電圧を比較して、前記第１インキの前記
２種類の波長による出力電圧の差があらかじめ設定した
しきい値以上の差を有し、前記第２インキの前記２種類
の波長による出力電圧が等しく、且つ前記波長１による
近赤外線の投光による前記メタメリックペア印刷物から
の反射又は透過による出力電圧が、第１インキ及び第２
インキにおいて等しいことにより、メタメリックペア印
刷物の真偽判別を行う演算部とを備えたことを特徴とす
る真偽判別印刷物の機械的判別装置。2. A metameric pair ink, which looks like a normal color under normal light and looks different under different light sources,
A mechanical discriminating apparatus for a metallic pair printed matter produced by printing two types of first ink and second ink having mutually different optical properties in the near infrared region on a base material, wherein the first ink And a light projecting unit for projecting two types of near-infrared rays of wavelengths 1 and 2 each having a different wavelength range toward the metameric pair printed matter printed with the second ink, and A light-receiving unit that receives two types of near-infrared reflected light or transmitted light and outputs a voltage corresponding to the amount of each received light, compares two output voltages from the light-receiving unit, and compares the two output voltages from the first ink. The difference between the output voltages at the two wavelengths is equal to or greater than a preset threshold value, the output voltages at the two wavelengths of the second ink are equal, and the near-infrared light at the wavelength 1 is projected. Yo Output voltage due to reflection or transmission from the metameric pair printed matter, first ink and the second
A mechanical discriminating device for authenticity discrimination printed matter, comprising: an arithmetic unit for discriminating the authenticity of the metameric pair printed matter by equality in ink.
外線領域の一部を吸収する前記第１インキと、近赤外線
領域の分光反射率が一定である前記第２インキであるこ
とを特徴とする真偽判別印刷物の機械的判別方法。3. The two kinds of inks according to claim 1, wherein the first ink absorbs a part of a near infrared region and the second ink has a constant spectral reflectance in a near infrared region. A mechanical discrimination method for the authenticity discrimination printed matter.
外線領域の一部を吸収する前記第１インキと、近赤外線
領域の分光反射率が一定である前記第２インキであるこ
とを特徴とする真偽判別印刷物の機械的判別装置。4. The two kinds of inks according to claim 2, wherein the first ink absorbs a part of a near infrared region and the second ink has a constant spectral reflectance in a near infrared region. A mechanical discrimination device for authenticity printed matter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9811799A JP3709539B2 (en) | 1999-04-05 | 1999-04-05 | Authenticity discrimination printed matter mechanical discrimination method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9811799A JP3709539B2 (en) | 1999-04-05 | 1999-04-05 | Authenticity discrimination printed matter mechanical discrimination method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000293729A true JP2000293729A (en) | 2000-10-20 |
| JP3709539B2 JP3709539B2 (en) | 2005-10-26 |
Family
ID=14211370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9811799A Expired - Fee Related JP3709539B2 (en) | 1999-04-05 | 1999-04-05 | Authenticity discrimination printed matter mechanical discrimination method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3709539B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003536303A (en) * | 2000-06-08 | 2003-12-02 | ハネウェル・インターナショナル・インコーポレーテッド | Near infrared camouflage detection |
| JP2005246821A (en) * | 2004-03-05 | 2005-09-15 | National Printing Bureau | Printed matter, identification method thereof and identification device |
| JP2006242909A (en) * | 2005-03-07 | 2006-09-14 | Toyota Central Res & Dev Lab Inc | Device part identification device |
| JP2007152841A (en) * | 2005-12-07 | 2007-06-21 | National Printing Bureau | True / false discrimination printed matter |
| JP2008068511A (en) * | 2006-09-14 | 2008-03-27 | National Printing Bureau | Authentic printed material |
| JP2011189319A (en) * | 2010-03-16 | 2011-09-29 | Nisshin Steel Co Ltd | Method for manufacturing chemically treated steel plate |
| WO2015035700A1 (en) * | 2013-09-16 | 2015-03-19 | 深圳市同盛绿色科技有限公司 | Optical anti-counterfeiting system, mobile terminal, and anti-counterfeiting label |
| JP2018522350A (en) * | 2015-07-13 | 2018-08-09 | イノヴィア フィルムズ リミテッド | Authentication apparatus and method |
-
1999
- 1999-04-05 JP JP9811799A patent/JP3709539B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003536303A (en) * | 2000-06-08 | 2003-12-02 | ハネウェル・インターナショナル・インコーポレーテッド | Near infrared camouflage detection |
| JP2005246821A (en) * | 2004-03-05 | 2005-09-15 | National Printing Bureau | Printed matter, identification method thereof and identification device |
| JP2006242909A (en) * | 2005-03-07 | 2006-09-14 | Toyota Central Res & Dev Lab Inc | Device part identification device |
| JP2007152841A (en) * | 2005-12-07 | 2007-06-21 | National Printing Bureau | True / false discrimination printed matter |
| JP2008068511A (en) * | 2006-09-14 | 2008-03-27 | National Printing Bureau | Authentic printed material |
| JP2011189319A (en) * | 2010-03-16 | 2011-09-29 | Nisshin Steel Co Ltd | Method for manufacturing chemically treated steel plate |
| WO2015035700A1 (en) * | 2013-09-16 | 2015-03-19 | 深圳市同盛绿色科技有限公司 | Optical anti-counterfeiting system, mobile terminal, and anti-counterfeiting label |
| JP2018522350A (en) * | 2015-07-13 | 2018-08-09 | イノヴィア フィルムズ リミテッド | Authentication apparatus and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3709539B2 (en) | 2005-10-26 |
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