JP5447243B2 - Anti-counterfeit medium and method for manufacturing the same - Google Patents

Anti-counterfeit medium and method for manufacturing the same Download PDF

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JP5447243B2
JP5447243B2 JP2010155955A JP2010155955A JP5447243B2 JP 5447243 B2 JP5447243 B2 JP 5447243B2 JP 2010155955 A JP2010155955 A JP 2010155955A JP 2010155955 A JP2010155955 A JP 2010155955A JP 5447243 B2 JP5447243 B2 JP 5447243B2
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JP2012016899A (en
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学 山本
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Dai Nippon Printing Co Ltd
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本発明は、紙幣、有価証券、証明書等の偽造防止技術に関するものである。   The present invention relates to a technique for preventing forgery of banknotes, securities, certificates, and the like.

各国紙幣等の一部には光に透かして見ると、表の模様と裏の模様が重なって、完成された模様となって見えるものがある。これは一つの図柄を2分割して、一方を基材の表面に、他方を基材の裏面に印刷したもので、単純なパターンが多い。したがって、通常の複写機を用いても容易に再現でき、偽造防止効果が低かった。   Some banknotes from various countries, when viewed through the light, have a pattern that looks like a finished pattern, with the front and back patterns overlapping. In this method, one design is divided into two, one is printed on the surface of the base material and the other is printed on the back surface of the base material, and there are many simple patterns. Therefore, it can be easily reproduced even with a normal copying machine, and the effect of preventing forgery is low.

なお、印刷方式または印刷加工方式による偽造防止技術については、例えば特許文献1〜4に開示されている。   In addition, forgery prevention technology by a printing method or a printing processing method is disclosed in Patent Documents 1 to 4, for example.

特開2000−272219号公報JP 2000-272219 A 特開2001−39004号公報JP 2001-39004 A 特開2007−253600号公報JP 2007-253600 A 特開2008−12722号公報JP 2008-12722 A

本発明者は、上記問題点に鑑みて鋭意検討を重ねた結果、元の図柄として錯視図形を用い、光に透かしたときに錯視図形が出現するとともに錯視が発現するように、基材の両面にそれぞれパターンを形成することで、偽造防止効果を高めることができることを見出した。
しかしながら、基材の一方の面を手前にして光に透かして見ると基材の他方の面に形成されたパターンは濃度が低下するため、元の図柄が出現しないあるいは出現し難い場合があることがわかった。そして、錯視の発現には濃淡が大きく影響するため、錯視図形の種類によっては、錯視が発現しないあるいは発現し難いことがわかった。
本発明は上記実情に鑑みてなされたものであり、基材の両面にパターンを形成したものを光で透かして見たときに両面のパターンが合成されて出現する画像を確認することで真偽の判定ができる、偽造が困難な偽造防止媒体およびその製造方法であって、錯視を生じさせやすくすることができる偽造防止媒体およびその製造方法を提供することを目的とする。
As a result of intensive studies in view of the above problems, the present inventor has used an illusion figure as an original design, and the optical illusion figure appears and the illusion appears when the light is watermarked. It was found that the anti-counterfeiting effect can be enhanced by forming a pattern on each.
However, when viewed through the light with one side of the base material facing forward, the pattern formed on the other side of the base material has a reduced density, so the original design may not appear or may not appear easily. I understood. And since the intensity of the illusion has a large effect on the expression of the illusion, it was found that the illusion does not occur or is difficult to develop depending on the type of the illusion figure.
The present invention has been made in view of the above circumstances, and it is true / false by confirming an image that appears when a pattern on both sides of a base material is formed by seeing the pattern formed on both sides with light. It is an object of the present invention to provide an anti-counterfeit medium that is difficult to counterfeit and a method for manufacturing the same, and an anti-counterfeit medium that can easily cause an optical illusion, and a method for manufacturing the medium.

上記課題を解決するために、本発明は、錯視図形を二分割した第1要素および第2要素のうち、上記第1要素が基材の一方の面に設けられ、上記第2要素が上記基材の他方の面に設けられた偽造防止媒体であって、さらに上記基材の一方の面に上記第2要素に重なるように上記第2要素と同形状の補助要素が設けられており、上記補助要素は、上記基材の一方の面を手前にして上記偽造防止媒体を光に透かしたときには上記錯視図形による錯視が発現し、上記偽造防止媒体を光に透かさないときには上記錯視図形による錯視が発現しないような濃度で設けられていることを特徴とする偽造防止媒体を提供する。   In order to solve the above problems, the present invention provides a first element and a second element obtained by dividing an illusion figure into two parts, wherein the first element is provided on one surface of the substrate, and the second element is the base. An anti-counterfeit medium provided on the other side of the material, further comprising an auxiliary element having the same shape as the second element so as to overlap the second element on one side of the base material, The auxiliary element has an illusion due to the illusion figure when the anti-counterfeit medium is watermarked with light on one side of the substrate, and an illusion due to the illusion figure when the anti-counterfeit medium is not transparent to light. Provided is an anti-counterfeit medium characterized in that it is provided at such a concentration that it does not appear.

本発明においては、基材の一方の面に第1要素が設けられ、基材の他方の面に第2要素が設けられ、さらに基材の一方の面に第2要素に重なるように第2要素と同形状の補助要素が設けられているので、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの第2要素の濃度の低下分を、補助要素によって補うことができる。さらに本発明においては、補助要素は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現し、偽造防止媒体を光に透かさないときには上記錯視図形による錯視が発現しないような濃度で設けられているので、光に透かして見たときにはじめて錯視が起こるため、偽造防止に有効である。通常の複写機では、第1要素、第2要素および補助要素の高精度な位置合わせが困難である上に、第1要素、第2要素および補助要素を所定の濃度で複写することも困難である。したがって本発明においては、高い偽造防止効果を達成することができる。   In the present invention, the first element is provided on one surface of the substrate, the second element is provided on the other surface of the substrate, and the second element is overlapped with the second element on one surface of the substrate. Since an auxiliary element having the same shape as the element is provided, the auxiliary element can compensate for the decrease in the density of the second element when the anti-counterfeit medium is watermarked with light on one side of the substrate facing forward. it can. Further, in the present invention, the auxiliary element has an illusion of an illusion figure when the anti-counterfeit medium is watermarked with light on one side of the substrate in front, and when the anti-counterfeit medium is not transparent to the light, Since the optical illusion is provided at such a concentration that the illusion does not appear, the illusion occurs only when viewed through the light, which is effective in preventing forgery. In a normal copying machine, it is difficult to accurately position the first element, the second element, and the auxiliary element, and it is also difficult to copy the first element, the second element, and the auxiliary element at a predetermined density. is there. Therefore, in the present invention, a high anti-counterfeit effect can be achieved.

上記発明においては、上記補助要素は、上記基材の一方の面を手前にして上記偽造防止媒体を光に透かしたときの上記補助要素および上記第2要素が重なる領域の濃度が、上記錯視図形を二分割した上記第2要素の濃度と略同一になるような濃度で設けられていることが好ましい。基材の一方の面を手前にして偽造防止媒体を光に透かしたときに第2要素の濃度が低下するために、錯視が発現しないあるいは発現し難い錯視図形の場合には、補助要素の濃度が上記のような濃度であることにより、錯視を発現しやすくすることができるからである。   In the above invention, the auxiliary element has an illusion figure in which the concentration of the area where the auxiliary element and the second element overlap when the forgery prevention medium is watermarked with light on one side of the base material facing forward. Is preferably provided at a concentration that is substantially the same as the concentration of the second element divided into two. When the anti-counterfeit medium is watermarked with light on one side of the substrate in front, the density of the second element decreases, so in the case of an illusion figure where the illusion does not occur or is difficult to develop, the density of the auxiliary element This is because the illusion can be easily developed by the above concentration.

また本発明においては、上記錯視図形を二分割した上記第1要素および上記第2要素が略同一の濃度であることが好ましい。錯視図形を二分割した第1要素および第2要素が略同一の濃度である場合には、基材の一方の面を手前にして偽造防止媒体を光に透かしたときに第2要素の濃度が低下するために、錯視が発現しないあるいは発現し難くなるので、本発明の構成とすることが有用である。   In the present invention, it is preferable that the first element and the second element obtained by dividing the illusion figure into two parts have substantially the same density. When the first element and the second element obtained by dividing the illusion figure into two parts have substantially the same density, the density of the second element is determined when the anti-counterfeit medium is watermarked with light with one side of the substrate facing forward. Since the optical illusion does not occur or is difficult to occur due to the decrease, it is useful to have the configuration of the present invention.

さらに本発明は、錯視図形を第1要素および第2要素に二分割する画像処理工程と、上記基材の他方の面に、上記第2要素を形成する第2要素形成工程と、上記基材の一方の面に、上記第1要素を形成し、さらに上記第2要素に重なるように上記第2要素と同形状の補助要素を形成する第1要素・補助要素形成工程とを有し、上記第1要素・補助要素形成工程では、上記補助要素を、上記基材の一方の面を手前にして上記偽造防止媒体を光に透かしたときには上記錯視図形による錯視が発現し、上記偽造防止媒体を光に透かさないときには上記錯視図形による錯視が発現しないような濃度で形成することを特徴とする偽造防止媒体の製造方法を提供する。   Furthermore, the present invention provides an image processing step for dividing an illusion figure into a first element and a second element, a second element forming step for forming the second element on the other surface of the base, and the base A first element / auxiliary element forming step of forming the first element on one surface of the first element and further forming an auxiliary element having the same shape as the second element so as to overlap the second element, In the first element / auxiliary element forming step, when the auxiliary element is watermarked with the anti-counterfeit medium facing one side of the substrate, the illusion with the illusion figure appears, and the anti-counterfeit medium is Provided is a method for producing a forgery prevention medium, characterized in that it is formed at such a concentration that the illusion due to the illusion figure does not appear when it is not transparent to light.

本発明においては、基材の一方の面に第2要素に重なるように第2要素と同形状の補助要素を形成し、さらに補助要素を、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現し、偽造防止媒体を光に透かさないときには上記錯視図形による錯視が発現しないような濃度で形成することによって、上述したように優れた偽造防止効果を得ることができる。したがって、既存の材料および装置を用いて偽造防止媒体を作製することが可能である。   In the present invention, an auxiliary element having the same shape as the second element is formed on one surface of the base material so as to overlap the second element, and the auxiliary element is placed on the one surface of the base material in front to prevent forgery. As described above, the anti-counterfeiting effect is excellent by forming the optical illusion with an illusion figure when it is watermarked in the light, and by forming the anti-counterfeit medium at a concentration that does not cause the illusion with the illusion figure when the anti-counterfeit medium is not transparent to the light. Can be obtained. Therefore, it is possible to produce an anti-counterfeit medium using existing materials and devices.

本発明においては、基材の一方の面に第1要素が設けられ、基材の他方の面に第2要素が設けられ、さらに基材の一方の面に第2要素に重なるように第2要素と同形状の補助要素が設けられているので、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの第2要素の濃度の低下分を補助要素によって補うことができ、その結果、偽造防止媒体を光に透かして観察すると錯視図形が出現し錯視が生じるので、偽造防止効果を向上させることが可能であるという効果を奏する。   In the present invention, the first element is provided on one surface of the substrate, the second element is provided on the other surface of the substrate, and the second element is overlapped with the second element on one surface of the substrate. Since an auxiliary element having the same shape as the element is provided, the auxiliary element can compensate for the decrease in the density of the second element when the anti-counterfeit medium is watermarked with light on one side of the substrate in front. As a result, when the anti-counterfeit medium is observed through the light, an illusion figure appears and an illusion is generated, so that the effect of preventing forgery can be improved.

本発明の偽造防止媒体に用いられる錯視図形の一例を示す模式図である。It is a schematic diagram which shows an example of the illusion figure used for the forgery prevention medium of this invention. 図1に示す錯視図形を二分割した模式図である。It is the schematic diagram which divided the illusion figure shown in FIG. 1 into two. 本発明の偽造防止媒体の一例を示す概略平面図および断面図である。It is the schematic plan view and sectional drawing which show an example of the forgery prevention medium of this invention. 本発明の偽造防止媒体を基材の一方の面を手前にして光に透かして観察した状態の一例を示す模式図である。It is a schematic diagram which shows an example of the state which observed the anti-counterfeit medium of the present invention through the light with one side of the substrate facing forward. 本発明の偽造防止媒体を基材の一方の面を手前にして光に透かして観察した状態の他の例を示す模式図である。It is a schematic diagram which shows the other example of the state which observed the anti-counterfeit medium of the present invention through the light with one side of the substrate facing forward. 本発明の偽造防止媒体の他の例を示す概略平面図である。It is a schematic plan view which shows the other example of the forgery prevention medium of this invention. 本発明の偽造防止媒体を基材の一方の面を手前にして光に透かして観察した状態の他の例を示す模式図である。It is a schematic diagram which shows the other example of the state which observed the anti-counterfeit medium of the present invention through the light with one side of the substrate facing forward. 本発明の偽造防止媒体の他の例を示す概略平面図である。It is a schematic plan view which shows the other example of the forgery prevention medium of this invention. 本発明の偽造防止媒体の他の例を示す概略断面図である。It is a schematic sectional drawing which shows the other example of the forgery prevention medium of this invention.

以下、本発明の偽造防止媒体およびその製造方法について詳細に説明する。   Hereinafter, the anti-counterfeit medium of the present invention and the manufacturing method thereof will be described in detail.

A.偽造防止媒体
本発明の偽造防止媒体は、錯視図形を二分割した第1要素および第2要素のうち、上記第1要素が基材の一方の面に設けられ、上記第2要素が上記基材の他方の面に設けられた偽造防止媒体であって、さらに上記基材の一方の面に上記第2要素に重なるように上記第2要素と同形状の補助要素が設けられており、上記補助要素は、上記基材の一方の面を手前にして上記偽造防止媒体を光に透かしたときには上記錯視図形による錯視が発現し、上記偽造防止媒体を光に透かさないときには上記錯視図形による錯視が発現しないような濃度で設けられていることを特徴とするものである。
A. Anti-Counterfeit Medium The anti-counterfeit medium of the present invention is the first element and the second element obtained by dividing an illusion figure into two parts, wherein the first element is provided on one surface of the base material, and the second element is the base material. An anti-counterfeit medium provided on the other surface of the substrate, and further provided with an auxiliary element having the same shape as the second element so as to overlap the second element on one surface of the substrate. The illusion with the illusion figure appears when the anti-counterfeit medium is watermarked with light on one side of the substrate facing forward, and the illusion with the illusion figure appears when the anti-counterfeit medium is not transparent to light It is characterized in that it is provided at a concentration that does not.

本発明の偽造防止媒体について図面を参照しながら説明する。
図1は本発明の偽造防止媒体に用いられる錯視図形の一例を示す模式図であり、図2(a)、(b)は図1に示す錯視図形を第1要素および第2要素に二分割した模式図である。図3(a)〜(d)は本発明の偽造防止媒体の一例を示す概略平面図および断面図であり、図1に示す錯視図形を用いた場合の例である。図3(a)は偽造防止媒体を基材の一方の面から見た平面図、図3(b)は偽造防止媒体を基材の他方の面から見た平面図、図3(c)は図3(a)、(b)のA−A線断面図、図3(d)は図3(a)、(b)のB−B線断面図である。
図1に示す錯視図形30は、白色と黒色の正方形が交互に横に並べられ、上下の正方形が半個分水平にずれて並べられており、上下の正方形の境界に黒色の水平な線が引かれたものである。この錯視図形30では、黒色の線が、左もしくは右に傾いて見える。これは、実際にはどれも水平で互いに平行な線が左もしくは右に傾いて見えるものであり、傾き錯視(Munsterberg, 1897)と呼ばれている。
The anti-counterfeit medium of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing an example of an illusion figure used in the anti-counterfeit medium of the present invention. FIGS. 2 (a) and 2 (b) divide the illusion figure shown in FIG. 1 into a first element and a second element. FIG. 3A to 3D are a schematic plan view and a cross-sectional view showing an example of the anti-counterfeit medium of the present invention, which is an example in the case of using the illusion figure shown in FIG. 3A is a plan view of the anti-counterfeit medium viewed from one side of the substrate, FIG. 3B is a plan view of the anti-counterfeit medium viewed from the other side of the substrate, and FIG. 3A and 3B are cross-sectional views taken along line AA, and FIG. 3D is a cross-sectional view taken along lines BB of FIGS. 3A and 3B.
In the illusion figure 30 shown in FIG. 1, white and black squares are alternately arranged horizontally, the upper and lower squares are horizontally shifted by half, and black horizontal lines are formed at the boundaries of the upper and lower squares. It is drawn. In this illusion figure 30, the black line appears to tilt left or right. This is actually the case where horizontal and parallel lines appear to tilt left or right, and is called the tilt illusion (Munsterberg, 1897).

図3(a)〜(d)に示す偽造防止媒体1においては、図1に示す錯視図形30を二分割した第1要素3(正方形3aおよび直線3b)および第2要素4(正方形)のうち、第1要素3(正方形3aおよび直線3b)が基材2の一方の面に設けられ、第2要素4(正方形)が基材2の他方の面に設けられており、さらに基材2の一方の面に第2要素4に重なるように第2要素4と同形状の補助要素5(正方形)が設けられている。第1要素3、第2要素4および補助要素5は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときに、第1要素3、第2要素4および補助要素5により分割する前の錯視図形が形成されるとともに、第2要素4および補助要素5が重なるように、位置合わせされて設けられている。また、第1要素3および第2要素4は、錯視図形に基づく色および濃度(例えば黒色)で印刷されている。一方、補助要素5は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現し、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないような濃度で印刷されており、具体的には第2要素4の濃度よりも低い濃度(例えば灰色)で印刷されている。   In the anti-counterfeit medium 1 shown in FIGS. 3A to 3D, among the first element 3 (square 3a and straight line 3b) and the second element 4 (square) obtained by dividing the illusion figure 30 shown in FIG. The first element 3 (square 3a and straight line 3b) is provided on one surface of the substrate 2, the second element 4 (square) is provided on the other surface of the substrate 2, and An auxiliary element 5 (square) having the same shape as the second element 4 is provided on one surface so as to overlap the second element 4. The first element 3, the second element 4, and the auxiliary element 5 are formed by the first element 3, the second element 4, and the auxiliary element 5 when the anti-counterfeit medium is watermarked in the light with one side of the substrate facing forward. An illusion figure before division is formed, and the second element 4 and the auxiliary element 5 are aligned and provided so as to overlap. The first element 3 and the second element 4 are printed in a color and density (for example, black) based on the illusion figure. On the other hand, the auxiliary element 5 has an illusion with an illusion figure when the anti-counterfeit medium is watermarked with light on one side of the substrate facing forward, and an illusion with an illusion figure does not appear when the anti-counterfeit medium is not transparent to light. It is printed at such a density, and specifically, it is printed at a density (for example, gray) lower than the density of the second element 4.

図4は、図3(a)〜(d)に示す偽造防止媒体1を基材2の一方の面を手前にして光に透かして観察した状態を示す模式図である。図3(a)〜(d)に示す偽造防止媒体1を基材2の一方の面を手前にして光に透かして観察すると、図4に例示するように、第1要素3と第2要素4と補助要素5とにより錯視図形10が形成される。基材2の両面に何も印刷されていない領域は、光が透過するので、基材2の色、濃度、印刷不透明度等に応じた状態(例えば白色)で視認される。第1要素3は、所定の色および濃度(例えば黒色)で印刷されており、基材2の一方の面を手前にしているので、濃度が維持された状態(例えば黒色)で視認される。第2要素4は所定の色および濃度(例えば黒色)で印刷され、補助要素5は所定の色および濃度(例えば灰色)で印刷されており、第2要素4と補助要素5とは、重なるように印刷されているので、偽造防止媒体1を基材2の一方の面を手前にして光に透かしたときの第2要素4の濃度に補助要素5の濃度が加算された状態(例えば黒色)で視認される。すなわち、偽造防止媒体1を基材2の一方の面を手前にして光に透かして観察すると、第2要素4は基材2の一方の面を手前にしているので濃度が低下するが、基材2の一方の面に、第2要素4に重なるように第2要素4と同形状の補助要素5が印刷されているので、補助要素5によって、基材2の一方の面を手前にして偽造防止媒体1を光に透かしたときの第2要素4の濃度の低下分が補われる。したがって、この場合には、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの第2要素4および補助要素5が重なる領域の濃度は、基材2の他方の面に印刷された第2要素4の濃度と略同一になる。さらに、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの第2要素4および補助要素5が重なる領域の濃度は、基材2の一方の面に印刷された第1要素3の濃度と略同一になる。よって、偽造防止媒体を基材の一方の面を手前にして光に透かして観察すると、図4に例示するように、第1要素3と第2要素4と補助要素5とにより錯視図形10が形成され、第1要素3の直線3bが左もしくは右に傾いて見える、傾き錯視が発現する。   FIG. 4 is a schematic diagram showing a state in which the forgery prevention medium 1 shown in FIGS. 3A to 3D is observed through one side of the base material 2 facing through the light. When the anti-counterfeit medium 1 shown in FIGS. 3A to 3D is observed through the light with one side of the base material 2 facing forward, as illustrated in FIG. 4, the first element 3 and the second element 4 and the auxiliary element 5 form an illusion figure 10. The areas where nothing is printed on both surfaces of the base material 2 transmit light, so that they are visually recognized in a state (for example, white) according to the color, density, printing opacity, and the like of the base material 2. Since the first element 3 is printed with a predetermined color and density (for example, black) and faces one side of the substrate 2, the first element 3 is visually recognized in a state where the density is maintained (for example, black). The second element 4 is printed with a predetermined color and density (for example, black), and the auxiliary element 5 is printed with a predetermined color and density (for example, gray), so that the second element 4 and the auxiliary element 5 overlap each other. Since the density of the auxiliary element 5 is added to the density of the second element 4 when the anti-counterfeit medium 1 is watermarked with light on one side of the substrate 2 facing forward (for example, black) Visible at. That is, when the anti-counterfeit medium 1 is observed through the light with one side of the base material 2 facing forward, the second element 4 has the one surface of the base material 2 facing forward, so the concentration decreases. Since the auxiliary element 5 having the same shape as the second element 4 is printed on one surface of the material 2 so as to overlap the second element 4, the auxiliary element 5 faces one surface of the base material 2 toward the front. The decrease in density of the second element 4 when the forgery prevention medium 1 is watermarked with light is compensated. Therefore, in this case, the concentration of the region where the second element 4 and the auxiliary element 5 overlap when the one surface of the base material is facing forward and the anti-counterfeit medium is watermarked with light is the other surface of the base material 2. It becomes substantially the same as the density of the printed second element 4. Further, the density of the region where the second element 4 and the auxiliary element 5 overlap when the forgery prevention medium is watermarked with light on one side of the base is the first printed on the one side of the base 2. It is substantially the same as the concentration of element 3. Therefore, when the anti-counterfeit medium is observed through the light with one side of the substrate facing forward, the illusion figure 10 is formed by the first element 3, the second element 4, and the auxiliary element 5, as illustrated in FIG. An inclination illusion appears, in which the straight line 3b of the first element 3 appears to tilt left or right.

なお、本発明において、「錯視」とは、濃淡により生じる錯視をいい、濃淡によって実際の図形とは異なる図形に見えることをいう。   In the present invention, the “illusion” means an illusion caused by shading, which means that the figure looks different from the actual figure due to the shading.

本発明において、補助要素は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現し、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないような濃度で設けられている。例えば図3(a)〜(d)に示す偽造防止媒体1を基材2の一方の面から反射光によって見た場合、補助要素5は上述したように錯視が発現しないような濃度で設けられており、また第2要素4は濃度が低下するので、所定の濃淡が出ないために錯視は起こらない。また、図3(a)〜(d)に示す偽造防止媒体1を基材2の他方の面から反射光によって見た場合には、第1要素3は濃度が低下するので、錯視図形自体が認識され難くなり、所定の濃淡が出ないために錯視は起こらない。これに対し、偽造防止媒体を基材の一方の面から透過光によって見ると、所定の濃淡が出るため錯視が起こる。例えば図3(a)〜(d)に示す偽造防止媒体1を基材2の一方の面から透過光によって見た場合、図4に例示するように、第1要素3と第2要素4と補助要素5とにより錯視図形10が出現し、基材2の両面に何も設けられていない領域と、第1要素3が設けられている領域と、第2要素4および補助要素5が重なる領域とが、所定の濃淡の関係となるため、濃淡によって錯視が起こる。   In the present invention, the auxiliary element has an illusion due to an illusion figure when the anti-counterfeit medium is watermarked with light on one side of the substrate facing forward, and an illusion due to an illusion figure appears when the anti-counterfeit medium is not transparent to light. It is provided at a concentration that does not. For example, when the anti-counterfeit medium 1 shown in FIGS. 3 (a) to 3 (d) is viewed from one surface of the substrate 2 by reflected light, the auxiliary element 5 is provided at a concentration that does not cause an illusion as described above. In addition, since the density of the second element 4 is lowered, the predetermined illusion does not occur, so that no illusion occurs. When the anti-counterfeit medium 1 shown in FIGS. 3A to 3D is viewed from the other surface of the base material 2 by reflected light, the density of the first element 3 is reduced, so that the illusion figure itself is The illusion does not occur because it becomes difficult to recognize and the predetermined shading does not appear. On the other hand, when the anti-counterfeit medium is viewed from one side of the base material with transmitted light, an illusion occurs because a predetermined shading appears. For example, when the anti-counterfeit medium 1 shown in FIGS. 3A to 3D is viewed from one surface of the substrate 2 with transmitted light, as illustrated in FIG. 4, the first element 3 and the second element 4 An illusion figure 10 appears by the auxiliary element 5, an area where nothing is provided on both surfaces of the base material 2, an area where the first element 3 is provided, and an area where the second element 4 and the auxiliary element 5 overlap. Is a predetermined shading relationship, and the illusion occurs due to shading.

このように本発明においては、基材の一方の面に第2要素に重なるように第2要素と同形状の補助要素が設けられており、さらに補助要素は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現し、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないような濃度で設けられているので、光に透かして見たときにはじめて錯視が起こる。一方、通常の複写機では、各要素の高精度な位置合わせが困難である上に、所望の濃度で補助要素を複写することも困難であるため、光に透かしたときにはじめて錯視が発現するように各要素を再現することは非常に難しい。したがって本発明においては、優れた偽造防止効果を得ることが可能であり、偽造防止技術として有効である。   As described above, in the present invention, the auxiliary element having the same shape as the second element is provided on one surface of the base material so as to overlap the second element, and the auxiliary element further faces the one surface of the base material. If the anti-counterfeit medium is watermarked with light, an illusion based on an illusion figure appears. The first optical illusion occurs. On the other hand, with ordinary copying machines, it is difficult to position each element with high accuracy, and it is also difficult to copy auxiliary elements at a desired density. It is very difficult to reproduce each element. Therefore, in the present invention, it is possible to obtain an excellent anti-counterfeit effect and is effective as an anti-counterfeit technology.

以下、本発明の偽造防止媒体における各構成について説明する。   Hereinafter, each structure in the forgery prevention medium of this invention is demonstrated.

1.錯視図形
本発明に用いられる錯視図形は、第1要素および第2要素に二分割されるものであり、錯視を発現するものである。本発明においては、基材の一方の面を手前にして偽造防止媒体を光に透かして観察した状態にて、基材の一方の面に設けられた第1要素および補助要素と、基材の他方の面に設けられた第2要素とにより錯視図形が形成される。
1. Illusion figure The illusion figure used in the present invention is divided into a first element and a second element, and expresses an illusion. In the present invention, the first element and the auxiliary element provided on one surface of the base material, with the one surface of the base material facing forward, and the anti-counterfeit medium observed through the light, An illusion figure is formed by the second element provided on the other surface.

本発明に用いられる錯視図形は、濃淡により錯視を発現するものであり、基材の一方の面を手前にして偽造防止媒体を光に透かして観察した状態にて、第1要素と第2要素と補助要素とにより形成され得るものであれば特に限定されるものではない。濃淡により錯視を発現する錯視図形であればいずれも用いることができる。   The illusion figure used in the present invention expresses the illusion by shading, and the first element and the second element are observed with the anti-counterfeit medium being observed through the light with one side of the substrate facing forward. There is no particular limitation as long as it can be formed by the auxiliary element. Any illusion figure that expresses the illusion by shading can be used.

上述したように、例えば図4に示すような錯視図形10が挙げられる。この場合、上述したように、図3(a)に示す基材2の一方の面に設けられた第1要素3および補助要素5と、図3(b)に示す基材2の他方の面に設けられた第2要素4とにより、偽造防止媒体を基材の一方の面を手前にして光に透かしたときに図4に示す錯視図形10を形成することができる。錯視図形10では、上述したように、第1要素3の直線3b(黒色)が、左もしくは右に傾いて見える。これは、実際にはどれも水平で互いに平行な線が左もしくは右に傾いて見えるものであり、傾き錯視(Munsterberg(1897))と呼ばれている。   As described above, for example, an illusion figure 10 as shown in FIG. In this case, as described above, the first element 3 and the auxiliary element 5 provided on one surface of the substrate 2 shown in FIG. 3A and the other surface of the substrate 2 shown in FIG. 4 can be formed when the anti-counterfeit medium is watermarked with light on one side of the substrate facing forward. In the illusion figure 10, as described above, the straight line 3b (black) of the first element 3 appears to tilt to the left or right. In fact, this is what all horizontal and parallel lines appear to tilt to the left or right, and is called the tilt illusion (Munsterberg (1897)).

図4において、第1要素3の直線3bは、正方形3aの濃度(例えば黒色)と同じ濃度(例えば黒色)であってもよく、正方形3aの濃度(例えば黒色)よりも低い濃度(例えば灰色)であってもよい。この場合にも、同様に、第1要素3の直線3b(灰色)が左もしくは右に傾いて見える。これは、実際にはどれも水平で互いに平行な線が左もしくは右に傾いて見えるものであり、傾き錯視(Fraser(1908)、Gregory and Heard(1979))と呼ばれている。   In FIG. 4, the straight line 3b of the first element 3 may have the same density (for example, black) as the density of the square 3a (for example, black), or a lower density (for example, gray) than the density of the square 3a (for example, black). It may be. In this case as well, the straight line 3b (gray) of the first element 3 appears to tilt to the left or right. This is actually a horizontal and parallel line that appears to tilt left or right, and is called the tilt illusion (Fraser (1908), Gregory and Heard (1979)).

また例えば図5に示すような錯視図形10が挙げられる。図5に示す錯視図形10は、黒色の正方形(第2要素4)と、交差部分に白い円形の開口部を有する灰色の格子(第1要素3)とを有している。この錯視図形10では、灰色の格子の交差部分にある白色の円の中に、黒っぽいものが現れたり、消えたりする。これは、実際にはないはずの黒い点がちらついて見えるものであり、きらめき格子錯視(Schrauf, Lingelbach and Wist(1997))と呼ばれている。
図5は、図6(a)、(b)に示す偽造防止媒体を基材の一方の面を手前にして光に透かして観察した状態を示す模式図である。図6(a)、(b)は本発明の偽造防止媒体の他の例を示す概略平面図であり、図6(a)は偽造防止媒体を基材の一方の面から見た平面図、図6(b)は偽造防止媒体を基材の他方の面から見た平面図である。この場合、図6(a)に示す基材2の一方の面に設けられた第1要素3および補助要素5と、図6(b)に示す基材2の他方の面に設けられた第2要素4とにより、偽造防止媒体を基材の一方の面を手前にして光に透かしたときに図5に示す錯視図形10を形成することができる。図5において、基材2の両面に何も印刷されていない領域(円形)は、光が透過するので、基材2の色、濃度、印刷不透明度等に応じた状態(例えば白色)で視認される。第1要素3(格子)は、所定の色および濃度(例えば灰色)で印刷されており、基材2の一方の面を手前にしているので、濃度が維持された状態(例えば灰色)で視認される。第2要素4(正方形)は所定の色および濃度(例えば黒色)で印刷され、補助要素5(正方形)は所定の色および濃度(例えば灰色)で印刷されており、第2要素4と補助要素5とは、重なるように配置されているので、偽造防止媒体1を基材2の一方の面を手前にして光に透かしたときの第2要素4の濃度に補助要素5の濃度が加算された状態(例えば黒色)で視認される。そのため、偽造防止媒体を基材の一方の面を手前にして光に透かしたときに、第1要素と第2要素と補助要素とにより錯視図形が形成され、きらめき格子錯視が発現する。
Further, for example, an illusion figure 10 as shown in FIG. The illusion figure 10 shown in FIG. 5 has a black square (second element 4) and a gray lattice (first element 3) having a white circular opening at the intersection. In this illusion figure 10, a dark thing appears or disappears in the white circle at the intersection of the gray lattice. This is what the black dots that should not actually appear to flicker, and is called the twinkle illusion (Schrauf, Lingelbach and Wist (1997)).
FIG. 5 is a schematic view showing a state in which the forgery prevention medium shown in FIGS. 6A and 6B is observed through the light with one side of the substrate facing forward. 6 (a) and 6 (b) are schematic plan views showing other examples of the forgery prevention medium of the present invention, and FIG. 6 (a) is a plan view of the anti-counterfeit medium viewed from one surface of the substrate, FIG. 6B is a plan view of the anti-counterfeit medium viewed from the other side of the substrate. In this case, the first element 3 and the auxiliary element 5 provided on one surface of the substrate 2 shown in FIG. 6A, and the first element 3 provided on the other surface of the substrate 2 shown in FIG. 6B. The two elements 4 can form the illusion figure 10 shown in FIG. 5 when the anti-counterfeit medium is watermarked with light on one side of the base. In FIG. 5, light is transmitted through areas where nothing is printed on both surfaces of the base material 2 (circular), so that the state is visually recognized (for example, white) according to the color, density, printing opacity, and the like of the base material 2. Is done. The first element 3 (lattice) is printed in a predetermined color and density (for example, gray), and faces one side of the substrate 2 so that the first element 3 (lattice) is visually recognized in a state where the density is maintained (for example, gray). Is done. The second element 4 (square) is printed with a predetermined color and density (for example, black), and the auxiliary element 5 (square) is printed with a predetermined color and density (for example, gray). 5 is arranged so as to overlap, the density of the auxiliary element 5 is added to the density of the second element 4 when the anti-counterfeit medium 1 is watermarked with light on one side of the substrate 2 facing forward. It is visually recognized in the state (for example, black). Therefore, when the anti-counterfeit medium is watermarked with light on one side of the substrate facing forward, an illusion figure is formed by the first element, the second element, and the auxiliary element, and the glittering lattice illusion appears.

図6(a)、(b)において、上述したように補助要素5の濃度(例えば灰色)は第2要素4の濃度(例えば黒色)よりも低くてもよく、補助要素5の濃度(例えば濃い灰色)は第2要素4の濃度(例えば薄い灰色)よりも高くてもよい。いずれの場合においても、偽造防止媒体を基材の一方の面を手前にして光に透かしたときに、第1要素と第2要素と補助要素とにより錯視図形が形成され、きらめき格子錯視が発現する。   6A and 6B, as described above, the density (for example, gray) of the auxiliary element 5 may be lower than the density (for example, black) of the second element 4, and the density of the auxiliary element 5 (for example, dark). Gray) may be higher than the concentration of the second element 4 (for example, light gray). In either case, when the anti-counterfeit medium is watermarked with light on one side of the substrate facing forward, an illusion figure is formed by the first element, the second element, and the auxiliary element, and the glittering lattice illusion appears. To do.

さらに例えば図7に示すような錯視図形10が挙げられる。図7に示す錯視図形10において、上3列の楕円は紙面の左から右に向けて濃度が薄くなり、下3列の楕円は紙面の左から右に向けて濃度が濃くなっている。この錯視図形10では、上3列は左に、下3列は右にゆっくりと動いて見える。これは、コントラストの低い領域からコントラストの高い領域の方向に動いて見える錯視であり、中心ドリフト錯視(北岡明佳(2003))と呼ばれている。
図7は、図8(a)、(b)に示す偽造防止媒体を基材の一方の面を手前にして光に透かして観察した状態を示す模式図である。図8(a)、(b)は本発明の偽造防止媒体の他の例を示す概略平面図であり、図8(a)は偽造防止媒体を基材の一方の面から見た平面図、図8(b)は偽造防止媒体を基材の他方の面から見た平面図である。この場合、図8(a)に示す基材2の一方の面に設けられた第1要素3および補助要素5と、図8(b)に示す基材2の他方の面に設けられた第2要素4とにより、図7に示す錯視図形10を形成することができる。図8(a)において、第1要素3は濃度が連続的に変化する階調を有し、上3列の半円は紙面の左から右に向けて濃度が薄くなり、下3列の半円は紙面の左から右に向けて濃度が濃くなっている。また、補助要素5も濃度が連続的に変化する階調を有し、上3列の半円は紙面の左から右に向けて濃度が薄くなり、下3列の半円は紙面の左から右に向けて濃度が濃くなっている。図8(b)においても、補助要素5と同様に、第2要素4は濃度が連続的に変化する階調を有し、上3列の半円は紙面の左から右に向けて濃度が薄くなり、下3列の半円は紙面の左から右に向けて濃度が濃くなっている。この場合、偽造防止媒体を基材の一方の面を手前にして光に透かしたときに第2要素は濃度が低下するので、図7に示す錯視図形10において、第1要素3と第2要素4および補助要素5が重なる領域との境界部分で濃度が連続的に変化するように、第1要素3、補助要素5および第2要素4の階調が調整される。これにより、錯視図形10も濃度が連続的に変化する階調を有するものとなる。したがって、偽造防止媒体を基材の一方の面を手前にして光に透かしたときに、第1要素と第2要素と補助要素とにより錯視図形が形成され、中心ドリフト錯視が発現する。
Further, for example, an illusion figure 10 as shown in FIG. In the illusion figure 10 shown in FIG. 7, the density of the upper three rows of ellipses decreases from left to right on the paper surface, and the density of the lower three rows of ellipses increases from left to right on the paper surface. In this illusion figure 10, the upper three rows appear to move slowly to the left, and the lower three rows appear to move slowly to the right. This is an illusion that appears to move from a low-contrast region to a high-contrast region, and is called the central drift illusion (Kitaoka Akika (2003)).
FIG. 7 is a schematic view showing a state in which the forgery prevention medium shown in FIGS. 8A and 8B is observed through one side of the base material in front of light. 8A and 8B are schematic plan views showing other examples of the forgery prevention medium of the present invention, and FIG. 8A is a plan view of the anti-counterfeit medium viewed from one surface of the substrate, FIG. 8B is a plan view of the anti-counterfeit medium viewed from the other side of the substrate. In this case, the first element 3 and the auxiliary element 5 provided on one surface of the substrate 2 shown in FIG. 8A, and the first element 3 provided on the other surface of the substrate 2 shown in FIG. 8B. The illusion figure 10 shown in FIG. 7 can be formed by the two elements 4. In FIG. 8A, the first element 3 has a gradation in which the density continuously changes, and the upper three rows of semicircles become darker from the left to the right of the page, and the lower three rows of half circles. Circles are darker from left to right on the page. In addition, the auxiliary element 5 also has a gradation in which the density changes continuously, and the upper three rows of semicircles decrease in density from the left to the right of the page, and the lower three rows of semicircles from the left of the page. The concentration increases toward the right. Also in FIG. 8B, like the auxiliary element 5, the second element 4 has a gradation in which the density continuously changes, and the upper three rows of semicircles have the density from the left to the right of the page. The lower three rows of semicircles become darker from left to right on the page. In this case, when the anti-counterfeit medium is watermarked with light facing one side of the base material, the density of the second element decreases. Therefore, in the illusion figure 10 shown in FIG. The gradation of the first element 3, the auxiliary element 5, and the second element 4 is adjusted so that the density continuously changes at the boundary portion between the area 4 and the area where the auxiliary element 5 overlaps. Thereby, the illusion figure 10 also has a gradation whose density changes continuously. Therefore, when the anti-counterfeit medium is watermarked with light on one side of the substrate facing forward, an illusion figure is formed by the first element, the second element, and the auxiliary element, and the center drift illusion appears.

錯視図形としては、中でも、略同一の濃度の第1要素および第2要素から構成されていることが好ましい。基材の一方の面に第1要素のみが設けられ、基材の他方の面に第2要素のみが設けられている場合には、基材の一方の面を手前にして偽造防止媒体を光に透かしたときに第2要素は濃度が低下した状態で視認されるため、基材の一方の面を手前にして偽造防止媒体を光に透かしたときに第1要素および第2要素が異なる濃度となり、錯視が発現し難くなる。これに対し、本発明においては補助要素によって基材の一方の面を手前にして偽造防止媒体を光に透かしたときの第2要素の濃度の低下分を補うことができるので、上記のような錯視図形の場合に本発明は好適である。
なお、第1要素および第2要素の濃度が略同一であるとは、第1要素の濃度を100%としたときに、第2要素の濃度が±5%以内であることをいう。
It is preferable that the illusion figure is composed of the first element and the second element having substantially the same density. When only the first element is provided on one side of the substrate and only the second element is provided on the other side of the substrate, the anti-counterfeit medium is lighted with one side of the substrate facing forward. Since the second element is visually recognized in a state in which the density is lowered when watermarked, the first element and the second element have different densities when the anti-counterfeit medium is watermarked with light on one side of the substrate. As a result, the illusion is less likely to occur. On the other hand, in the present invention, the auxiliary element can compensate for the decrease in the density of the second element when the anti-counterfeit medium is watermarked in the light with one side of the substrate facing forward. The present invention is suitable for illusion figures.
The fact that the concentrations of the first element and the second element are substantially the same means that the concentration of the second element is within ± 5% when the concentration of the first element is 100%.

2.補助要素
本発明における補助要素は、第2要素と同形状であり、基材の一方の面に第2要素に重なるように設けられ、さらに基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現し、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないような濃度で設けられているものである。
2. Auxiliary element The auxiliary element in the present invention has the same shape as the second element, is provided on one surface of the base material so as to overlap the second element, and further has a forgery prevention medium with the one surface of the base material facing forward. The optical illusion is provided at a concentration such that an illusion with an illusion figure appears when the light is watermarked, and an illusion with an illusion figure does not appear when the anti-counterfeit medium is not transparent to the light.

補助要素の形状としては、第2要素と同形状であれば特に限定されるものではなく、第2要素の形状に応じて適宜選択される。   The shape of the auxiliary element is not particularly limited as long as it is the same shape as the second element, and is appropriately selected according to the shape of the second element.

また、補助要素の形成位置としては、基材の一方の面を手前にして偽造防止媒体を光に透かしたときに補助要素および第2要素が重なるように、基材の一方の面に設けられていれば特に限定されるものではなく、第2要素の形成位置に応じて適宜選択される。   The auxiliary element is formed on one surface of the base material so that the auxiliary element and the second element overlap when the anti-counterfeit medium is watermarked with light facing one side of the base material. If it has, it will not specifically limit, According to the formation position of a 2nd element, it selects suitably.

補助要素の濃度としては、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現し、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないような濃度であれば特に限定されるものではない。
なお、「補助要素の濃度」とは、補助要素の反射濃度をいう。
例えば、基材の一方の面を手前にして偽造防止媒体を光に透かさないときには、第1要素の濃度>(第2要素の濃度+補助要素の濃度)となり、錯視が発現しないが、基材の一方の面を手前にして偽造防止媒体を基材の一方の面を手前にして光に透かしたときには、第1要素の濃度≒(第2要素の濃度+補助要素の濃度)、あるいは、第1要素の濃度<(第2要素の濃度+補助要素の濃度)となり、錯視が発現する場合が挙げられる。
As for the concentration of the auxiliary element, an illusion with an illusion figure appears when the anti-counterfeit medium is watermarked with light on one side of the substrate, and an illusion with an illusion figure does not appear when the anti-counterfeit medium is not transparent to light. There is no particular limitation as long as it has such a concentration.
Note that “the density of the auxiliary element” refers to the reflection density of the auxiliary element.
For example, when one side of the substrate is facing forward and the anti-counterfeit medium is not transparent to light, the concentration of the first element> (the concentration of the second element + the concentration of the auxiliary element), and no illusion appears. When the anti-counterfeit medium is watermarked on the light with one side of the substrate facing forward, the density of the first element ≒ (the density of the second element + the density of the auxiliary element), or The density of one element <(the density of the second element + the density of the auxiliary element).

補助要素の濃度は、基材の他方の面に設けられた第2要素の濃度と略同一であってもよく異なっていてもよい。異なる場合、補助要素の濃度は、基材の他方の面に設けられた第2要素の濃度よりも低くてもよく高くてもよい。   The concentration of the auxiliary element may be substantially the same as or different from the concentration of the second element provided on the other surface of the substrate. If different, the concentration of the auxiliary element may be lower or higher than the concentration of the second element provided on the other side of the substrate.

具体的には、補助要素の濃度は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現するように、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの補助要素と第2要素とが重なる領域の濃度が、錯視図形を二分割した第2要素の濃度と略同一となるような濃度であることが好ましい。基材の一方の面を手前にして偽造防止媒体を光に透かしたときに第2要素の濃度が低下するために、錯視が発現しないあるいは発現し難い錯視図形の場合には、補助要素の濃度が上記のような濃度であることにより、錯視を発現しやすくすることができるからである。   Specifically, the concentration of the auxiliary element is such that when one side of the substrate is facing forward and the anti-counterfeit medium is watermarked with light, an illusion due to an illusion pattern appears. It is preferable that the density of the area where the auxiliary element and the second element overlap when the forgery prevention medium is watermarked with light is substantially the same as the density of the second element obtained by dividing the illusion figure into two. When the anti-counterfeit medium is watermarked with light on one side of the substrate in front, the density of the second element decreases, so in the case of an illusion figure where the illusion does not occur or is difficult to develop, the density of the auxiliary element This is because the illusion can be easily developed by the above concentration.

なお、「基材の一方の面を手前にして偽造防止媒体を光に透かしたときの補助要素と第2要素とが重なる領域の濃度が、錯視図形を二分割した第2要素の濃度と略同一となる」とは、錯視図形を二分割した第2要素の濃度を100%としたときに、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの補助要素と第2要素とが重なる領域の濃度が±10%以内であることをいう。   It should be noted that “the density of the region where the auxiliary element and the second element overlap when the anti-counterfeit medium is watermarked with light on one side of the base material is close to the density of the second element obtained by dividing the illusion figure into two parts. “Same” means that when the density of the second element obtained by dividing the illusion figure into two is 100%, the auxiliary element when the anti-counterfeit medium is watermarked in the light with one side of the substrate facing forward The density of the region where the two elements overlap is within ± 10%.

そのため、例えば、基材の他方の面に設けられた第2要素の濃度が、錯視図形を二分割した第2要素の濃度と略同一である場合には、補助要素の濃度は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの補助要素と第2要素とが重なる領域の濃度が、基材の他方の面に設けられた第2要素の濃度と略同一となるような濃度であることが好ましい。基材の一方の面を手前にして偽造防止媒体を光に透かしたときに第2要素の濃度が低下するために、錯視が発現しないあるいは発現し難い錯視図形の場合には、補助要素の濃度が上記のような濃度であることにより、錯視を発現しやすくすることができるからである。
この場合、補助要素の濃度は、通常、基材の他方の面に設けられた第2要素の濃度よりも低くなる。
Therefore, for example, when the concentration of the second element provided on the other surface of the substrate is substantially the same as the concentration of the second element obtained by dividing the illusion figure into two, the concentration of the auxiliary element is The density of the area where the auxiliary element and the second element overlap when the anti-counterfeit medium is watermarked with light on one side is approximately the same as the density of the second element provided on the other side of the substrate It is preferable that the concentration be such that When the anti-counterfeit medium is watermarked with light on one side of the substrate in front, the density of the second element decreases, so in the case of an illusion figure where the illusion does not occur or is difficult to develop, the density of the auxiliary element This is because the illusion can be easily developed by the above concentration.
In this case, the concentration of the auxiliary element is usually lower than the concentration of the second element provided on the other surface of the substrate.

なお、「基材の一方の面を手前にして偽造防止媒体を光に透かしたときの補助要素と第2要素とが重なる領域の濃度が、基材の他方の面に設けられた第2要素の濃度と略同一となる」とは、基材の他方の面に設けられた第2要素の濃度を100%としたときに、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの補助要素と第2要素とが重なる領域の濃度が±10%以内であることをいう。
ここで、「基材の他方の面に設けられた第2要素の濃度」とは、第2要素の反射濃度をいう。
It should be noted that “the second element provided on the other surface of the base material has a concentration in a region where the auxiliary element and the second element overlap when the anti-counterfeit medium is watermarked with light on one side of the base material. "It is almost the same as the density of" when the concentration of the second element provided on the other surface of the base material is 100% and the anti-counterfeit medium is lighted with one surface of the base material facing forward. It means that the density of the area where the auxiliary element and the second element overlap when watermarked is within ± 10%.
Here, “the density of the second element provided on the other surface of the substrate” refers to the reflection density of the second element.

また、補助要素の濃度は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現するように、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの補助要素と第2要素とが重なる領域の濃度が、錯視図形を二分割した第1要素の濃度と略同一となるような濃度であることが好ましい。通常、基材の一方の面に設けられた第1要素の濃度は、錯視図形を二分割した第1要素の濃度と略同一とされることから、補助要素の濃度は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの補助要素と第2要素とが重なる領域の濃度が、基材の一方の面に設けられた第1要素の濃度と略同一となるような濃度であることが好ましい。錯視図形を二分割した第1要素および第2要素が略同一の濃度である場合には、補助要素の濃度が上記のような濃度であることにより、錯視を発現しやすくすることができるからである。
この場合、補助要素の濃度は、通常、基材の一方の面に設けられた第1要素の濃度よりも低くなる。
In addition, the concentration of the auxiliary element is such that when one side of the substrate is facing forward and the anti-counterfeit medium is watermarked with light, an illusion due to an illusion pattern appears, and the anti-counterfeit medium is facing one side of the substrate. It is preferable that the density of the area where the auxiliary element and the second element overlap when the light is watermarked is substantially the same as the density of the first element obtained by dividing the illusion figure into two. Usually, the concentration of the first element provided on one surface of the substrate is substantially the same as the concentration of the first element obtained by dividing the illusion figure into two parts. The density of the region where the auxiliary element and the second element overlap when the anti-counterfeit medium is watermarked with light facing forward is substantially the same as the density of the first element provided on one side of the substrate. It is preferable that the concentration is high. When the first element and the second element obtained by dividing the illusion figure into two parts have substantially the same density, the auxiliary element has the above-described density, so that the illusion can be easily expressed. is there.
In this case, the concentration of the auxiliary element is usually lower than the concentration of the first element provided on one surface of the substrate.

なお、「基材の一方の面を手前にして偽造防止媒体を光に透かしたときの補助要素と第2要素とが重なる領域の濃度が、基材の一方の面に設けられた第1要素の濃度と略同一となる」とは、基材の一方の面に設けられた第1要素の濃度を100%としたときに、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの補助要素と第2要素とが重なる領域の濃度が±10%以内であることをいう。
ここで、「基材の一方の面に設けられた第1要素の濃度」とは、第1要素の反射濃度をいう。
The first element provided on the one surface of the substrate has the density of the area where the auxiliary element and the second element overlap when the forgery prevention medium is watermarked with light on one side of the substrate. "It is almost the same as the concentration of" when the concentration of the first element provided on one side of the substrate is 100% and the anti-counterfeit medium is lighted with one side of the substrate facing forward. It means that the density of the area where the auxiliary element and the second element overlap when watermarked is within ± 10%.
Here, “the density of the first element provided on one surface of the substrate” refers to the reflection density of the first element.

また、補助要素の濃度は、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないように、基材の一方の面を手前にして偽造防止媒体を反射光によって見たときの第2要素および補助要素が重なる領域の濃度が、基材の一方の面を手前にして偽造防止媒体を透過光によって見たときの第2要素および補助要素が重なる領域の濃度よりも薄くなるような濃度であることが好ましい。補助要素の濃度が上記のような濃度であることにより、偽造防止媒体を光に透かさないときに、錯視を発現し難くすることができるからである。   Further, the concentration of the auxiliary element is second when the anti-counterfeit medium is viewed by reflected light with one side of the substrate facing forward so that the optical illusion is not generated when the anti-counterfeit medium is not transparent to light. Concentration in which the area where the element and the auxiliary element overlap is such that the density of the area where the second element and the auxiliary element overlap when the anti-counterfeit medium is viewed with transmitted light with one side of the substrate facing forward It is preferable that This is because when the concentration of the auxiliary element is as described above, the optical illusion can be made difficult to occur when the anti-counterfeit medium is not transparent to light.

さらに、補助要素の濃度は、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないように、基材の一方の面を手前にして偽造防止媒体を反射光によって見たときの第2要素および補助要素が重なる領域の濃度が、錯視図形を二分割した第2要素の濃度よりも薄くなるような濃度であることが好ましい。すなわち、補助要素の濃度は、基材の一方の面を手前にして偽造防止媒体を反射光によって見たときの第2要素および補助要素が重なる領域の濃度が、基材の他方の面に設けられた第2要素の濃度よりも薄くなるような濃度であることが好ましい。補助要素の濃度が上記のような濃度であることにより、偽造防止媒体を光に透かさないときに、錯視を発現し難くすることができるからである。   Further, the concentration of the auxiliary element is the second when the anti-counterfeit medium is viewed by reflected light with one side of the substrate facing forward so that an optical illusion due to an illusion figure does not appear when the anti-counterfeit medium is not transparent to light. It is preferable that the density of the region where the element and the auxiliary element overlap is such that the density is lower than the density of the second element obtained by dividing the illusion figure into two parts. That is, the concentration of the auxiliary element is such that the concentration of the region where the second element and the auxiliary element overlap when the anti-counterfeit medium is viewed with reflected light with one surface of the substrate facing forward is provided on the other surface of the substrate. The concentration is preferably lower than the concentration of the second element. This is because when the concentration of the auxiliary element is as described above, the optical illusion can be made difficult to occur when the anti-counterfeit medium is not transparent to light.

補助要素の反射濃度、第1要素の反射濃度、第2要素の反射濃度は、通常、反射濃度計で計測する。このとき、例えば基材の濃度をゼロとして相対濃度を算出することができる。
また、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの補助要素と第2要素とが重なる領域の濃度も、通常、反射濃度計で計測する。このとき、例えば基材を光に透かしたときの基材の濃度をゼロとして相対濃度を算出することができる。
The reflection density of the auxiliary element, the reflection density of the first element, and the reflection density of the second element are usually measured with a reflection densitometer. At this time, for example, the relative concentration can be calculated by setting the concentration of the substrate to zero.
Also, the density of the region where the auxiliary element and the second element overlap when the forgery prevention medium is watermarked with light facing one side of the substrate is usually measured with a reflection densitometer. At this time, for example, the relative density can be calculated by setting the density of the base material to zero when the base material is watermarked with light.

補助要素の色としては、錯視図形の色に応じて適宜選択されるものであり、特に限定されるものではない。   The color of the auxiliary element is appropriately selected according to the color of the illusion figure, and is not particularly limited.

3.第1要素
本発明における第1要素は、錯視図形を二分割した一方の要素であり、基材の一方の面に設けられるものである。
3. 1st element The 1st element in this invention is one element which divided the illusion figure into two, and is provided in one surface of a base material.

第1要素の形状としては、錯視図形に応じて適宜選択されるものであり、特に限定されるものではない。
また、第1要素の形成位置としては、基材の一方の面を手前にして偽造防止媒体を光に透かしたときに第1要素と第2要素と補助要素とにより錯視図形が形成されるように、基材の一方の面に設けられていれば特に限定されるものではなく、錯視図形に応じて適宜選択される。
基材の一方の面に設けられた第1要素の濃度としては、通常、錯視図形を二分割した第1要素と略同一の濃度とされる。
なお、基材の一方の面に設けられた第1要素の濃度と錯視図形を二分割した第1要素の濃度とが略同一であるとは、錯視図形を二分割した第1要素の濃度を100%としたときに、基材の一方の面に設けられた第1要素の濃度が±5%以内であることをいう。
第1要素の色としては、錯視図形の色に応じて適宜選択されるものであり、特に限定されるものではない。
The shape of the first element is appropriately selected according to the illusion figure, and is not particularly limited.
The first element is formed such that an illusion figure is formed by the first element, the second element, and the auxiliary element when the forgery prevention medium is watermarked with light on one side of the substrate facing forward. In addition, it is not particularly limited as long as it is provided on one surface of the substrate, and is appropriately selected according to the illusion figure.
The density of the first element provided on one surface of the substrate is generally set to be approximately the same as the density of the first element obtained by dividing the illusion figure into two parts.
The density of the first element provided on one surface of the substrate and the density of the first element obtained by dividing the illusion figure into two are substantially the same. When 100%, the concentration of the first element provided on one surface of the substrate is within ± 5%.
The color of the first element is appropriately selected according to the color of the illusion figure, and is not particularly limited.

4.第2要素
本発明における第2要素は、錯視図形を二分割した他方の要素であり、基材の他方の面に設けられるものである。
4). 2nd element The 2nd element in this invention is the other element which divided the illusion figure into two, and is provided in the other surface of a base material.

第2要素の形状としては、錯視図形に応じて適宜選択される。
また、第2要素の形成位置としては、基材の一方の面を手前にして偽造防止媒体を光に透かしたときに第1要素と第2要素と補助要素とにより錯視図形が形成されるように、基材の他方の面に設けられていれば特に限定されるものではなく、錯視図形に応じて適宜選択される。
基材の他方の面に設けられた第2要素の濃度としては、錯視図形を二分割した第2要素の濃度と略同一であってもよく異なっていてもよい。また、異なる場合には、基材の他方の面に設けられた第2要素の濃度が、錯視図形を二分割した第2要素の濃度よりも低くてもよく高くてもよい。
なお、基材の他方の面に設けられた第2要素の濃度と錯視図形を二分割した第2要素の濃度とが略同一であるとは、錯視図形を二分割した第2要素の濃度を100%としたときに、基材の他方の面に設けられた第2要素の濃度が±5%以内であることをいう。
第2要素の色としては、錯視図形の色に応じて適宜選択されるものであり、特に限定されるものではない。
The shape of the second element is appropriately selected according to the illusion figure.
The second element is formed such that an illusion figure is formed by the first element, the second element, and the auxiliary element when the anti-counterfeit medium is watermarked with light on one side of the substrate facing forward. In addition, it is not particularly limited as long as it is provided on the other surface of the substrate, and is appropriately selected according to the illusion figure.
The concentration of the second element provided on the other surface of the substrate may be substantially the same as or different from the concentration of the second element obtained by dividing the illusion figure into two parts. In addition, when different, the density of the second element provided on the other surface of the substrate may be lower or higher than the density of the second element obtained by dividing the illusion figure into two.
Note that the density of the second element provided on the other surface of the base material and the density of the second element obtained by dividing the illusion figure into two are substantially the same. When 100%, it means that the concentration of the second element provided on the other surface of the substrate is within ± 5%.
The color of the second element is appropriately selected according to the color of the illusion figure, and is not particularly limited.

5.基材
本発明における基材は、一方の面に第1要素および補助要素が設けられ、他方の面に第2要素が設けられるものである。
5. Substrate In the substrate of the present invention, the first element and the auxiliary element are provided on one surface, and the second element is provided on the other surface.

本発明においては、基材の一方の面を手前にして偽造防止媒体を光に透かして観察することから、基材は光を透過する必要がある。一方、基材の光透過率が高いと、偽造防止媒体を光に透かさなくとも錯視図形が視認されて錯視が生じてしまうおそれがある。したがって、基材の印刷不透明度は、25%〜95%の範囲内であることが好ましい。
ここで、印刷不透明度とは、基材に印刷した画像がその反対面から透き通って見えない程度のことをいう。印刷不透明度は、基材の白紙不透明度(単に不透明度ともいう。)の他にインキの浸透性の影響を受ける。基材の不透明度が高くとも、インキの浸透性が良ければインキが浸透した分だけ、印刷不透明度は低下する。
また、白紙不透明度とは、一枚の基材を透き通して、下の基材の画像が見えない程度のことをいう。
なお、基材の印刷不透明度は、不透明度測定器、ハンター白色度計等により測定することができる。
In the present invention, since the anti-counterfeit medium is observed through the light with one side of the substrate facing forward, the substrate needs to transmit light. On the other hand, when the light transmittance of the base material is high, the illusion figure may be visually recognized without causing the anti-counterfeit medium to transmit light, and an illusion may occur. Therefore, the printing opacity of the substrate is preferably in the range of 25% to 95%.
Here, the printing opacity refers to an extent that an image printed on a base material cannot be seen through from the opposite side. The printing opacity is affected by the ink permeability in addition to the blank paper opacity (also simply referred to as opacity) of the substrate. Even if the opacity of the substrate is high, if the ink permeability is good, the printing opacity is reduced by the amount of ink penetration.
Further, the blank paper opacity refers to a level where an image of a lower substrate cannot be seen through a single substrate.
The printing opacity of the substrate can be measured with an opacity meter, a hunter whiteness meter, or the like.

また、基材は裏抜けしにくいものであることが好ましい。第1要素、第2要素および補助要素が裏抜けすると、偽造防止媒体を光に透かさなくとも錯視図形が視認されて錯視が生じてしまうおそれがあるからである。
ここで、裏抜けとは、インキが反対面に抜けることをいう。裏抜けは、基材の光学的特性ではなく、インキの浸透性に起因する。
なお、基材が裏抜けしにくいものであることは、例えば、基材の他方の面を手前にして反射光で見たときの第1要素の濃度を測定することで、評価することができる。
Moreover, it is preferable that a base material is hard to penetrate through. This is because if the first element, the second element, and the auxiliary element pass through, the optical illusion figure may be visually recognized without causing the anti-counterfeit medium to pass through the light and an optical illusion may occur.
Here, the back-through means that the ink escapes to the opposite surface. The strike-through is not due to the optical properties of the substrate, but due to the penetrability of the ink.
In addition, it can be evaluated that the base material is difficult to see through, for example, by measuring the concentration of the first element when viewed with reflected light with the other surface of the base material facing forward. .

基材としては、上述の特性を満たすものであれば特に限定されるものではなく、例えば、紙、樹脂基材などを用いることができる。また、基材は、透明な樹脂基材上に、上述の特性を満たす下地層が形成されたものであってもよい。下地層の材料としては、上述の特性を満たすものであれば特に限定されるものではないが、中でも、透明な樹脂基材と密着性を有する材料であることが好ましく、例えば、酸化チタンを含有する白色コート剤、顔料インキ、染料インキ、第1要素、第2要素および補助要素の印刷に用いられるインキを吸収し得るコーティング材料、多孔質層形成用コーティング材料等が挙げられる。   The substrate is not particularly limited as long as it satisfies the above-described characteristics. For example, paper, a resin substrate, or the like can be used. Further, the base material may be one in which a base layer satisfying the above-described characteristics is formed on a transparent resin base material. The material for the underlayer is not particularly limited as long as it satisfies the above-mentioned characteristics, but among them, a material having adhesion to a transparent resin base material is preferable, for example, containing titanium oxide. White coating agent, pigment ink, dye ink, coating material capable of absorbing ink used for printing of the first element, the second element and the auxiliary element, a coating material for forming a porous layer, and the like.

上述したように、錯視の発現には濃淡が重要であり、通常は基材の両面に何も設けられていない領域も存在することから、錯視図形に応じて、基材の色や濃度等を選択することが好ましい。   As mentioned above, shade is important for the development of optical illusions, and there are usually areas where nothing is provided on both sides of the substrate, so depending on the illusion figure, the color, density, etc. of the substrate can be changed. It is preferable to select.

6.保護層
本発明においては、図9に例示するように、基材2の一方の面に第1要素(図示なし)および補助要素5を覆うように、第1要素(図示なし)および補助要素5を保護する保護層7が形成されていてもよい。また、図9に例示するように基材2の他方の面に第2要素4を覆うように、第2要素4を保護する保護層8が形成されていてもよい。
保護層の材料としては、透明性を有し、第1要素、第2要素および補助要素を保護することができるものであれば特に限定されるものではなく、一般的な樹脂材料を用いることができる。
6). Protective layer In the present invention, as illustrated in FIG. 9, the first element (not shown) and the auxiliary element 5 are arranged so as to cover the first element (not shown) and the auxiliary element 5 on one surface of the substrate 2. Protective layer 7 may be formed. Moreover, the protective layer 8 which protects the 2nd element 4 may be formed so that the other surface of the base material 2 may cover the 2nd element 4 so that it may illustrate in FIG.
The material of the protective layer is not particularly limited as long as it has transparency and can protect the first element, the second element, and the auxiliary element, and a general resin material may be used. it can.

7.用途
本発明の偽造防止媒体は、例えば、紙幣、商品券、株券、小切手、手形等の各種の有価証券、パスポート、カード等の各種の証明書、機密文書等に用いることができる。
7). Applications The anti-counterfeit medium of the present invention can be used for various securities such as banknotes, gift certificates, stock certificates, checks, bills, various certificates such as passports and cards, confidential documents, and the like.

B.偽造防止媒体の製造方法
本発明の偽造防止媒体の製造方法は、錯視図形を第1要素および第2要素に二分割する画像処理工程と、上記基材の他方の面に、上記第2要素を形成する第2要素形成工程と、上記基材の一方の面に、上記第1要素を形成し、さらに上記第2要素に重なるように上記第2要素と同形状の補助要素を形成する第1要素・補助要素形成工程とを有し、上記第1要素・補助要素形成工程では、上記補助要素を、上記基材の一方の面を手前にして上記偽造防止媒体を光に透かしたときには上記錯視図形による錯視が発現し、上記偽造防止媒体を光に透かさないときには上記錯視図形による錯視が発現しないような濃度で形成することを特徴とするものである。
B. Method for manufacturing anti-counterfeit medium The method for manufacturing an anti-counterfeit medium according to the present invention comprises an image processing step of dividing an illusion figure into a first element and a second element, and the second element on the other surface of the substrate. A second element forming step to be formed, and a first element for forming the first element on one surface of the substrate and further forming an auxiliary element having the same shape as the second element so as to overlap the second element. An element / auxiliary element forming step. In the first element / auxiliary element forming step, when the auxiliary element is watermarked with light on the anti-counterfeit medium facing one side of the substrate, the illusion When the optical illusion is caused by a figure and the anti-counterfeit medium is not transparent to light, the optical illusion by the illusion figure is formed at such a concentration.

本発明の偽造防止媒体の製造方法について図面を参照しながら説明する。
図1に例示する錯視図形30は、白色と黒色の正方形が交互に横に並べられ、上下の正方形が半個分水平にずれて並べられており、上下の正方形の境界に黒色の水平な線が引かれたものである。まず、図1に示す錯視図形30を、図2(a)、(b)に示すように、第1要素3(黒色の正方形3aおよび直線3b)(図2(a))と、第2要素4(黒色の正方形)(図2(b))とに二分割する。この際、錯視図形を二分割する2つの要素のいずれを基材の一方の面および他方の面に印刷するかを考慮して、錯視図形を二分割する。ここでは、第1要素が基材の一方の面に印刷され、第2要素が基材の他方の面に印刷される。
The manufacturing method of the forgery prevention medium of this invention is demonstrated referring drawings.
An illusion figure 30 illustrated in FIG. 1 has white and black squares alternately arranged side by side, and the upper and lower squares are horizontally shifted by half, and a black horizontal line at the boundary of the upper and lower squares. Is drawn. First, as shown in FIGS. 2 (a) and 2 (b), an illusion figure 30 shown in FIG. 1 is converted into a first element 3 (black square 3a and straight line 3b) (FIG. 2 (a)) and a second element. 4 (black square) (FIG. 2B). At this time, the illusion figure is divided into two parts in consideration of which of the two elements that divide the illusion figure into two parts is printed on one side and the other side of the substrate. Here, the first element is printed on one side of the substrate and the second element is printed on the other side of the substrate.

基材の一方の面には、第1要素が印刷され、さらに第2要素に重なるように第2要素と同形状の補助要素が印刷される。そこで、次に、基材の一方の面に印刷される第1要素および補助要素の濃度と、基材の他方の面に印刷される第2要素の濃度とを決定する。基材の一方の面に印刷される第1要素の濃度は、通常、錯視図形を二分割した第1要素と略同一の濃度とされる。一方、基材の他方の面に印刷される第2要素の濃度は、錯視図形を二分割した第2要素と略同一であってもよく異なっていてもよい。また、基材の一方の面に印刷される補助要素の濃度は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現し、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないような濃度とされる。具体的に、補助要素の濃度は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現するように、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの第2要素および補助要素が重なる領域の濃度と、錯視図形を二分割した第2要素の濃度とが略同一となるように、調整される。また、補助要素の濃度は、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないように、基材の一方の面を手前にして偽造防止媒体を反射光によって見たときの第2要素および補助要素が重なる領域の濃度が、錯視図形を二分割した第2要素の濃度よりも薄くなるように、調整される。   A first element is printed on one surface of the substrate, and an auxiliary element having the same shape as the second element is printed so as to overlap the second element. Then, next, the density | concentration of the 1st element printed on one side of a base material and an auxiliary element, and the density | concentration of the 2nd element printed on the other side of a base material are determined. The density of the first element printed on one surface of the base material is usually substantially the same density as the first element obtained by dividing the illusion figure into two parts. On the other hand, the density of the second element printed on the other surface of the substrate may be substantially the same as or different from the second element obtained by dividing the illusion figure into two parts. Also, the concentration of the auxiliary element printed on one side of the substrate is such that when one side of the substrate is facing forward and the anti-counterfeit medium is watermarked with light, an optical illusion appears, and the anti-counterfeit medium is When it is not transparent, the density is set so that the illusion due to the illusion figure does not appear. Specifically, the concentration of the auxiliary element is counterfeited with one side of the substrate facing forward so that an illusion with an illusion figure appears when the anti-counterfeit medium is watermarked with light facing one side of the substrate facing forward. The density of the region where the second element and the auxiliary element overlap when the prevention medium is watermarked with light is adjusted so that the density of the second element obtained by dividing the illusion figure into two is substantially the same. Further, the concentration of the auxiliary element is second when the anti-counterfeit medium is viewed by reflected light with one side of the substrate facing forward so that the optical illusion is not generated when the anti-counterfeit medium is not transparent to light. The density of the region where the element and the auxiliary element overlap is adjusted to be lower than the density of the second element obtained by dividing the illusion figure into two parts.

次いで、図2(b)に示す第2要素4を、図3(b)に示すように基材2の他方の面に予め決定した濃度(例えば黒色)で印刷する(第2要素形成工程)。続いて、図2(a)に示す第1要素3を、図3(a)に示すように基材2の一方の面に予め決定した濃度(例えば黒色)で印刷し、さらに図2(b)に示す第2要素4と同形状の補助要素5を、図3(a)、(c)に示すように基材2の一方の面に第2要素4に重なるように予め算出した濃度(例えば灰色)で印刷する(第1要素・補助要素形成工程)。この際、第1要素3と第2要素4と補助要素5とは互いに位置が合うように印刷される。   Next, the second element 4 shown in FIG. 2B is printed at a predetermined density (for example, black) on the other surface of the substrate 2 as shown in FIG. 3B (second element forming step). . Subsequently, the first element 3 shown in FIG. 2A is printed at a predetermined density (for example, black) on one surface of the substrate 2 as shown in FIG. The concentration of the auxiliary element 5 having the same shape as the second element 4 shown in FIG. 3) calculated in advance so as to overlap the second element 4 on one surface of the substrate 2 as shown in FIGS. For example, it is printed in gray) (first element / auxiliary element forming step). At this time, the first element 3, the second element 4, and the auxiliary element 5 are printed so that their positions are aligned with each other.

図4は、図3(a)、(b)に示す偽造防止媒体1を基材2の一方の面を手前にして光に透かして観察した状態を示す模式図である。図4においては、上述したように、基材2の一方の面に第2要素4に重なるように第2要素4と同形状の補助要素5を印刷するので、補助要素5によって、基材2の一方の面を手前にして偽造防止媒体1を光に透かしたときの第2要素4の濃度の低下分が補われる。すなわち、第2要素4は所定の色および濃度(例えば黒色)で印刷され、補助要素5は所定の色および濃度(例えば灰色)で印刷されており、第2要素4と補助要素5とは、重なるように印刷されているので、偽造防止媒体1を基材2の一方の面を手前にして光に透かしたときの第2要素4の濃度に補助要素5の濃度が加算された状態(例えば黒色)で視認される。第1要素3は、所定の色および濃度(例えば黒色)で印刷されており、基材2の一方の面を手前にしているので、濃度が維持された状態(例えば黒色)で視認される。基材2の両面に何も印刷されていない領域は、光が透過するので、基材2の色、濃度、印刷不透明度等に応じた状態(例えば白色)で視認される。したがって、偽造防止媒体を基材の一方の面を手前にして光に透かして観察すると、図4に例示するように、第1要素3と第2要素4と補助要素5とにより錯視図形10が形成され、第1要素3の直線3bが左もしくは右に傾いて見える、傾き錯視が発現する。   FIG. 4 is a schematic diagram showing a state in which the forgery prevention medium 1 shown in FIGS. 3A and 3B is observed through one side of the substrate 2 in front of the light. In FIG. 4, as described above, the auxiliary element 5 having the same shape as the second element 4 is printed on one surface of the base material 2 so as to overlap the second element 4. The amount of decrease in the density of the second element 4 when the forgery prevention medium 1 is watermarked with light facing one side of the above is compensated. That is, the second element 4 is printed with a predetermined color and density (for example, black), the auxiliary element 5 is printed with a predetermined color and density (for example, gray), and the second element 4 and the auxiliary element 5 are Since the printing is performed so as to overlap, the density of the auxiliary element 5 is added to the density of the second element 4 when the anti-counterfeit medium 1 is watermarked in the light with one side of the base material 2 facing forward (for example, Black). Since the first element 3 is printed with a predetermined color and density (for example, black) and faces one side of the substrate 2, the first element 3 is visually recognized in a state where the density is maintained (for example, black). The areas where nothing is printed on both surfaces of the base material 2 transmit light, so that they are visually recognized in a state (for example, white) according to the color, density, printing opacity, and the like of the base material 2. Therefore, when the anti-counterfeit medium is observed through the light with one side of the substrate facing forward, the illusion figure 10 is formed by the first element 3, the second element 4, and the auxiliary element 5, as illustrated in FIG. An inclination illusion appears, in which the straight line 3b of the first element 3 appears to tilt left or right.

一方、図3(a)、(b)に示す偽造防止媒体1を基材2の一方の面から反射光によって見た場合、上述したように補助要素5は錯視が発現しないような濃度で印刷されており、また第2要素4は濃度が低下するので、所定の濃淡が出ないために錯視は起こらない。また、図3(a)、(b)に示す偽造防止媒体1を基材2の他方の面から反射光によって見た場合には、第1要素3は濃度が低下するので、錯視図形自体が認識され難くなり、所定の濃淡が出ないために錯視は起こらない。   On the other hand, when the anti-counterfeit medium 1 shown in FIGS. 3 (a) and 3 (b) is viewed from one surface of the substrate 2 by reflected light, the auxiliary element 5 is printed at such a concentration that the optical illusion does not appear as described above. In addition, since the density of the second element 4 is lowered, no predetermined illusion is produced, so that no illusion occurs. Also, when the anti-counterfeit medium 1 shown in FIGS. 3A and 3B is viewed from the other surface of the base material 2 by reflected light, the density of the first element 3 decreases, so that the illusion figure itself is The illusion does not occur because it becomes difficult to recognize and the predetermined shading does not appear.

このように本発明においては、基材の一方の面に第2要素に重なるように第2要素と同形状の補助要素を形成し、その際、補助要素を、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現し、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないような濃度で形成するので、光に透かして見たときにはじめて錯視が起こる。一方、通常の複写機では、各要素の高精度な位置合わせが困難である上に、所望の濃度で補助要素を複写することも困難であるため、光に透かしたときにはじめて錯視が発現するように各要素を再現することは非常に難しい。したがって本発明においては、優れた偽造防止効果を得ることが可能であり、偽造防止技術として有効である。   Thus, in the present invention, an auxiliary element having the same shape as the second element is formed on one surface of the base material so as to overlap the second element, and in this case, the auxiliary element is placed in front of one surface of the base material. When an anti-counterfeit medium is watermarked with light, an illusion due to an illusion figure appears. The first optical illusion occurs. On the other hand, with ordinary copying machines, it is difficult to position each element with high accuracy, and it is also difficult to copy auxiliary elements at a desired density. It is very difficult to reproduce each element. Therefore, in the present invention, it is possible to obtain an excellent anti-counterfeit effect and is effective as an anti-counterfeit technology.

さらに本発明においては、第1要素、第2要素および補助要素を形成するに際して、位置合わせの印刷技術については高い精度が必要とされるが、既存の材料や装置を利用して偽造防止媒体を作製することが可能である。   Furthermore, in the present invention, when forming the first element, the second element, and the auxiliary element, high accuracy is required for the alignment printing technique. However, a forgery prevention medium is used by utilizing existing materials and apparatuses. It is possible to produce.

なお、錯視図形、第1要素、第2要素および補助要素については、上記「A.偽造防止媒体」の項に詳しく記載したので、ここでの説明は省略する。
以下、本発明の偽造防止媒体の製造方法における各工程について説明する。
Since the illusion figure, the first element, the second element, and the auxiliary element are described in detail in the section “A. Anti-counterfeit medium”, description thereof is omitted here.
Hereinafter, each process in the manufacturing method of the forgery prevention medium of this invention is demonstrated.

1.画像処理工程
本発明における画像処理工程は、錯視図形を第1要素および第2要素に二分割する工程である。
錯視図形を第1要素および第2要素に二分割するに際しては、錯視図形を二分割する2つの要素のいずれを基材の一方の面および他方の面に形成するかを考慮して、錯視図形を二分割する。
錯視図形の分割は、例えばコンピューターシステム上の画像処理ソフトウェアを用いて行うことができる。
1. Image processing step The image processing step in the present invention is a step of dividing an illusion figure into two parts, a first element and a second element.
When the illusion figure is divided into the first element and the second element, the illusion figure is determined in consideration of which of the two elements that divide the illusion figure into one side and the other side of the substrate. Is divided into two.
The division of the illusion figure can be performed using image processing software on a computer system, for example.

2.第1要素・補助要素形成工程
本発明における第1要素・補助要素形成工程は、基材の一方の面に、第1要素を形成し、さらに第2要素に重なるように第2要素と同形状の補助要素を形成する工程であり、補助要素を、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現し、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないような濃度で形成する工程である。
2. First element / auxiliary element forming step The first element / auxiliary element forming step in the present invention is the same shape as the second element so that the first element is formed on one surface of the base material and further overlaps the second element. When the auxiliary element is watermarked with light on the anti-counterfeit medium facing one side of the substrate, the optical illusion appears, and the anti-counterfeit medium is not transparent to the light. This is a step of forming at a concentration that does not cause the illusion of an illusion figure.

第1要素および補助要素の形成方法としては、第1要素、補助要素および第2要素を位置合わせして形成できる方法であれば特に限定されるものではなく、例えば、オフセット印刷、グラビア印刷、活版印刷、凹版印刷、スクリーン印刷、粉体電子写真方式のデジタル印刷、液体電子写真方式のデジタル印刷、インクジェット方式のデジタル印刷等の印刷法や、転写法が挙げられる。   The method for forming the first element and the auxiliary element is not particularly limited as long as the first element, the auxiliary element, and the second element can be formed by alignment. For example, offset printing, gravure printing, letterpress Examples thereof include printing methods such as printing, intaglio printing, screen printing, powder electrophotographic digital printing, liquid electrophotographic digital printing, inkjet digital printing, and transfer methods.

第1要素を形成するに際しては、通常、第1要素の濃度を、錯視図形を二分割する第1要素の濃度と略同一になるように調整する。   When forming the first element, the density of the first element is usually adjusted so as to be substantially the same as the density of the first element that bisects the illusion figure.

また、補助要素の濃度は、基材の一方の面を手前にして偽造防止媒体を光に透かしたときには錯視図形による錯視が発現し、偽造防止媒体を光に透かさないときには錯視図形による錯視が発現しないような濃度に調整される。補助要素の濃度は、実際に測定して求めてもよく、検量線を用いて求めてもよく、シミュレーションにより求めてもよい。
検量線を用いる場合には、例えば次のように補助要素の濃度を求めることができる。すなわち、まず、基材の他方の面に、実際に基材の他方の面に形成する第2要素の濃度にて複数のベタの測定用パターンIを形成する。次に、基材の一方の面に、測定用パターンIと重なるように異なる濃度(少なくとも3種)にて複数のベタの測定用パターンAを形成し、さらに測定用パターンIと重ならないように同様に異なる濃度(少なくとも3種)にて複数のベタの測定用パターンBを形成する。次いで、基材の一方の面から反射による各測定用パターンBの相対濃度Bを計測し、さらに基材の一方の面から透過による各測定用パターンIおよび各測定用パターンAが重なる領域の相対濃度Aを計測する。続いて、上記の相対濃度Aと相対濃度Bとにより検量線を作成する。この検量線を基に、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの第2要素および補助要素が重なる領域の濃度と、補助要素の濃度とを予測することができる。同じ基材、同じインキを使用する場合には、作成した検量線を用いて、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの第2要素および補助要素が重なる領域の濃度と、補助要素の濃度とを予測することが可能である。
In addition, the concentration of the auxiliary element causes an illusion with an illusion figure when the anti-counterfeit medium is watermarked with light on one side of the substrate, and an illusion with an illusion figure appears when the anti-counterfeit medium is not transparent to light. The density is adjusted so that it does not. The concentration of the auxiliary element may be obtained by actual measurement, may be obtained using a calibration curve, or may be obtained by simulation.
When using a calibration curve, for example, the concentration of the auxiliary element can be obtained as follows. That is, first, a plurality of solid measurement patterns I are formed on the other surface of the substrate at the concentration of the second element that is actually formed on the other surface of the substrate. Next, a plurality of solid measurement patterns A are formed on one surface of the substrate at different concentrations (at least three types) so as to overlap with the measurement pattern I, and so as not to overlap with the measurement pattern I. Similarly, a plurality of solid measurement patterns B are formed at different concentrations (at least three). Next, the relative density B of each measurement pattern B by reflection is measured from one surface of the base material, and the relative area of each measurement pattern I and each measurement pattern A by transmission from one surface of the base material is compared. Concentration A is measured. Subsequently, a calibration curve is created from the relative concentration A and the relative concentration B described above. Based on this calibration curve, it is possible to predict the density of the area where the second element and the auxiliary element overlap when the forgery prevention medium is watermarked with light on one side of the substrate and the density of the auxiliary element it can. When the same substrate and the same ink are used, the area where the second element and auxiliary element overlap when the forgery prevention medium is watermarked with light on one side of the substrate facing forward using the created calibration curve And the concentration of the auxiliary element can be predicted.

なお、補助要素の濃度については、上記「A.偽造防止媒体」の項に詳しく記載したので、ここでの説明は省略する。
また、第1要素および補助要素のその他の点については、上記「A.偽造防止媒体」の項に記載したので、ここでの説明は省略する。
Since the concentration of the auxiliary element is described in detail in the above section “A. Anti-counterfeit medium”, description thereof is omitted here.
Further, since the other points of the first element and the auxiliary element are described in the above section “A. Anti-counterfeit medium”, the description thereof is omitted here.

3.第2要素形成工程
本発明における第2要素形成工程は、基材の他方の面に、第2要素を、基材の一方の面を手前にして偽造防止媒体を光に透かしたときの濃度の低下分を計算して形成する工程である。
3. Second Element Forming Step The second element forming step in the present invention is the concentration of the second element on the other surface of the base material when the second element is on the front side of the base material and the anti-counterfeit medium is watermarked with light. This is a step of calculating and forming a decrease.

第2要素を形成するに際して、第2要素の濃度は、上述したように、錯視図形を二分割する第2要素の濃度と略同一であってもよく異なっていてもよい。   When forming the second element, the density of the second element may be substantially the same as or different from the density of the second element that bisects the illusion figure, as described above.

なお、第2要素の形成方法については、上記の第1要素および補助要素の形成方法と同様であるので、ここでの説明は省略する。
また、第2要素のその他の点については、上記「A.偽造防止媒体」の項に記載したので、ここでの説明は省略する。
The method for forming the second element is the same as the method for forming the first element and the auxiliary element described above, and a description thereof is omitted here.
The other points of the second element are described in the above section “A. Anti-counterfeit medium”, and thus the description thereof is omitted here.

本発明は、上記実施形態に限定されるものではない。上記実施形態は例示であり、本発明の特許請求の範囲に記載された技術的思想と実質的に同一な構成を有し、同様な作用効果を奏するものは、いかなるものであっても本発明の技術的範囲に包含される。   The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has any configuration that has substantially the same configuration as the technical idea described in the claims of the present invention and that exhibits the same effects. Are included in the technical scope.

以下、実施例を挙げて本発明を具体的に説明する。
[実施例1](紙媒体 傾き錯視)
(画像処理)
CADシステム上にて、1辺が20mmの黒色の正方形を横方向に20mmの間隔をおいて5個並べた画像を形成し、1段目の正方形画像群とした。この1段目の正方形画像群の下方に、1段目の正方形画像群と同様の画像を、1段目の正方形画像群と接するように配置し、かつ左右の位置が1段目の正方形画像群に対して左に10mmずれるように配置し、2段目の正方形画像群とした。また、2段目の正方形画像群の下方に、1段目の正方形画像群と同様の画像を、2段目の正方形画像群と接するように配置し、かつ左右の位置が2段目の正方形画像群に対して右に10mmずれるように配置し、3段目の正方形画像群とした。さらに、3段目の正方形画像群の下方に、1段目の正方形画像群と同様の画像を、3段目の正方形画像群と接するように配置し、かつ左右の位置が3段目の正方形画像群に対して左に10mmずれるように配置し、4段目の正方形画像群とした。そして、4段目の正方形画像群の下方に、1段目の正方形画像群と同様の画像を、4段目の正方形画像群と接するように配置し、かつ左右の位置が4段目の正方形画像群に対して右に10mmずれるように配置し、5段目の正方形画像群とした。このようにして、横方向に正方形が5個並ぶ正方形画像群が縦方向に5段並んだ画像を作成した。
次に、各正方形の接する部分をつなぐように、横方向に4本の直線を配置し、傾き錯視画像(錯視図形30)を作成した(図1)。
Hereinafter, the present invention will be specifically described with reference to examples.
[Example 1] (paper medium tilt illusion)
(Image processing)
On the CAD system, an image in which five black squares each having a side of 20 mm were arranged in the horizontal direction at intervals of 20 mm was formed as a first-stage square image group. Below the first-stage square image group, an image similar to the first-stage square image group is arranged so as to be in contact with the first-stage square image group, and the left and right positions are the first-stage square image group. Arranged so as to be shifted 10 mm to the left of the group, a second-stage square image group was obtained. An image similar to the first-stage square image group is arranged below the second-stage square image group so as to be in contact with the second-stage square image group, and the left and right positions are the second-stage square image group. Arranged so as to be shifted 10 mm to the right with respect to the image group, a third-stage square image group was obtained. Furthermore, an image similar to the first-stage square image group is arranged below the third-stage square image group so as to be in contact with the third-stage square image group, and the left and right positions are the third-stage square image group. Arranged so as to be shifted 10 mm to the left with respect to the image group, a fourth-stage square image group was obtained. An image similar to the first-stage square image group is arranged below the fourth-stage square image group so as to be in contact with the fourth-stage square image group, and the left and right positions are the fourth-stage square images. Arranged so as to be shifted 10 mm to the right with respect to the image group, a fifth-stage square image group was obtained. In this way, an image was created in which five square image groups in which five squares are arranged in the horizontal direction are arranged in five stages in the vertical direction.
Next, four straight lines were arranged in the horizontal direction so as to connect the contact portions of each square, and an inclination illusion image (illusion figure 30) was created (FIG. 1).

この傾き錯視画像を、縦方向1,3,5段目の正方形画像群および4本の直線(第1要素3(正方形3aおよび直線3b))と、縦方向2,4段目の正方形画像群(第2要素4)との、2つの画像に分割した(図2(a)、(b))。   This tilt illusion image is divided into a square image group of the first, third, and fifth stages in the vertical direction and four straight lines (first element 3 (square 3a and straight line 3b)) and a square image group of the second and fourth stages in the vertical direction. The image was divided into two images (second element 4) (FIGS. 2A and 2B).

(印刷)
厚さ64g/m2の上質紙に、オフセット印刷機にてブラックインクを用いて、傾き錯視画像を得るための2つの画像を印刷した。
上質紙の一方の面に、図2(a)に示す縦方向1,3,5段目の正方形画像群および4本の直線(第1要素3)と、図2(b)に示す縦方向2,4段目の正方形画像群(第2要素4)と同形状の補助要素とを印刷した。このとき、縦方向1,3,5段目の正方形画像群および4本の直線を相対濃度D=1.50にて印刷し、縦方向2,4段目の正方形画像群を相対濃度D=0.2にて印刷した(図3(a))。この際、補助要素の濃度は、上述の手法にて求めた。
上質紙の他方の面には、図9(b)に示す縦方向2,4段目の正方形画像群(第2要素4)を相対濃度D=1.50にて印刷した(図3(b))。この際、両面の画像の印刷位置は、光に上質紙を透かしたときに両面の画像が重なり、画像を2つに分割する前の画像が見える位置とした。
(printing)
Two images for obtaining a tilt illusion image were printed on high-quality paper having a thickness of 64 g / m 2 by using black ink with an offset printer.
On one surface of the high-quality paper, a group of square images in the vertical direction 1, 3 and 5 shown in FIG. 2A and four straight lines (first element 3), and a vertical direction shown in FIG. The square image group (second element 4) in the second and fourth stages and the auxiliary element having the same shape were printed. At this time, the square images in the first, third, and fifth rows in the vertical direction and the four straight lines are printed at a relative density D = 1.50, and the square image group in the second and fourth rows in the vertical direction is printed with the relative density D = Printing was performed at 0.2 (FIG. 3A). At this time, the concentration of the auxiliary element was obtained by the method described above.
On the other surface of the high-quality paper, a square image group (second element 4) in the second and fourth stages in the vertical direction shown in FIG. 9B was printed at a relative density D = 1.50 (FIG. 3B )). At this time, the printing position of the double-sided image was set to a position where the double-sided image overlapped when the high-quality paper was watermarked on the light and the image before the image was divided into two could be seen.

(透過検証)
作製した印刷物を、40Wの蛍光灯から2.0m離れた場所にて、一方の面から透かして見たところ、傾き錯視が発現した。透かして見た状態における印刷物の相対濃度は、すべての正方形画像群および線がD=1.50相当であった(図4)。なお、ここでいう相対濃度は、基材の両面ともに印刷されていない部分の濃度をD=0とした場合の濃度をいう。
(Transparent verification)
When the produced printed material was viewed through one side at a location 2.0 m away from a 40 W fluorescent lamp, an inclination illusion appeared. With respect to the relative density of the printed matter in the state seen through, all the square image groups and lines corresponded to D = 1.50 (FIG. 4). The relative density referred to here is a density when D = 0 is set to a density of a portion where both surfaces of the base material are not printed.

(反射検証)
作製した印刷物を、一方の面および他方の面から反射光のみで見たところ、一方の面では1,3,5段目の正方形画像群および4本の直線が相対濃度D=1.50、2,4段目の正方形画像群が相対濃度D=0.4にて見え、他方の面では1,3,5段目の正方形画像群および4本の直線が相対濃度D=0.05、2,4段目の正方形画像群が相対濃度D=1.50にて見え、傾き錯視は発現しなかった。なお、ここでいう相対濃度は、基材の両面ともに印刷されていない部分の濃度をD=0とした場合の濃度をいう。
印刷物は、光に透かして見ることによって、傾き錯視を発現することを確認した。
(Reflection verification)
When the produced printed material was viewed from only one surface and the other surface with only reflected light, the first, third, and fifth step square image groups and the four straight lines had a relative density D = 1.50 on one surface. The second and fourth step square image groups are visible at a relative density D = 0.4, and the other surface has the first, third, and fifth step square image groups and four straight lines with a relative density D = 0.05. The second and fourth square image groups were visible at a relative density D = 1.50, and the tilt illusion did not appear. The relative density referred to here is a density when D = 0 is set to a density of a portion where both surfaces of the base material are not printed.
It was confirmed that the printed material developed a tilt illusion when viewed through light.

[比較例1](紙媒体 傾き錯視)
(画像処理)
実施例1と同様にして、傾き錯視画像(錯視図形30)を作成した(図1)。
この傾き錯視画像を、縦方向1,3,5段目の正方形画像群および4本の直線(第1要素3(正方形3aおよび直線3b))と、縦方向2,4段目の正方形画像群(第2要素4)との、2つの画像に分割した(図2(a)、(b))。
[Comparative Example 1] (Paper medium tilt illusion)
(Image processing)
A tilt illusion image (illusionary figure 30) was created in the same manner as in Example 1 (FIG. 1).
This tilt illusion image is divided into a square image group of the first, third, and fifth stages in the vertical direction and four straight lines (first element 3 (square 3a and straight line 3b)) and a square image group of the second and fourth stages in the vertical direction. The image was divided into two images (second element 4) (FIGS. 2A and 2B).

(印刷)
厚さ64g/m2の上質紙の両面に、オフセット印刷機にてブラックインクを用いて、傾き錯視画像を分割した2つの画像をそれぞれ印刷した。上質紙の一方の面には、図2(a)に示す縦方向1,3,5段目の正方形画像群および4本の直線(第1要素3)を相対濃度D=1.50にて印刷し、上質紙の他方の面には、図2(b)に示す縦方向2,4段目の正方形画像群(第2要素4)を相対濃度D=1.50にて印刷した。この際、両面の画像の印刷位置は、光に上質紙を透かしたときに両面の画像が重なり、画像を2つに分割する前の画像が見える位置とした。
(printing)
Two images obtained by dividing the tilt illusion image were printed on both sides of a high-quality paper having a thickness of 64 g / m 2 by using black ink with an offset printer. On one surface of the high-quality paper, a group of square images in the vertical direction 1, 3, and 5 shown in FIG. 2A and four straight lines (first element 3) are provided at a relative density D = 1.50. On the other side of the high-quality paper, the second and fourth square image groups (second element 4) shown in FIG. 2B were printed at a relative density D = 1.50. At this time, the printing position of the double-sided image was set to a position where the double-sided image overlapped when the high-quality paper was watermarked on the light and the image before the image was divided into two could be seen.

(透過検証)
作製した印刷物を、40Wの蛍光灯から2.0m離れた場所にて、一方の面から光に透かして見たところ、傾き錯視は発現しなかった。光に透かして見た状態における印刷物の相対濃度は、縦方向1,3,5段目の正方形画像群および4本の直線部分が相対濃度D=1.50、縦方向2,4段目の正方形画像群が相対濃度D=0.3相当であり、傾き錯視は発現しなかった。なお、ここでいう相対濃度は、基材の両面ともに印刷されていない部分の濃度をD=0とした場合の濃度をいう。
(Transparent verification)
When the produced printed matter was viewed through light from one side at a distance of 2.0 m from a 40 W fluorescent lamp, no tilt illusion was developed. The relative density of the printed material in the state viewed through the light is as follows: the square image group in the first, third, and fifth stages in the vertical direction and the four straight lines have a relative density D = 1.50, and the second and fourth stages in the vertical direction. The square image group had a relative density of D = 0.3, and the tilt illusion did not appear. The relative density referred to here is a density when D = 0 is set to a density of a portion where both surfaces of the base material are not printed.

1 … 偽造防止媒体
2 … 基材
3 … 第1要素
4 … 第2要素
5 … 補助要素
7,8 … 保護層
10,30 … 錯視図形
DESCRIPTION OF SYMBOLS 1 ... Anti-counterfeit medium 2 ... Base material 3 ... 1st element 4 ... 2nd element 5 ... Auxiliary element 7, 8 ... Protective layer 10,30 ... Illusion figure

Claims (4)

錯視図形を二分割した第1要素および第2要素のうち、前記第1要素が基材の一方の面に設けられ、前記第2要素が前記基材の他方の面に設けられた偽造防止媒体であって、
さらに前記基材の一方の面に前記第2要素に重なるように前記第2要素と同形状の補助要素が設けられており、
前記補助要素は、前記基材の一方の面を手前にして前記偽造防止媒体を光に透かしたときには前記錯視図形による錯視が発現し、前記偽造防止媒体を光に透かさないときには前記錯視図形による錯視が発現しないような濃度で設けられていることを特徴とする偽造防止媒体。
Of the first element and the second element obtained by dividing the optical illusion figure into two, the first element is provided on one surface of the base material, and the second element is provided on the other surface of the base material. Because
Furthermore, an auxiliary element having the same shape as the second element is provided so as to overlap the second element on one surface of the base material,
The auxiliary element has an illusion with the illusion figure when the anti-counterfeit medium is watermarked with light on one side of the substrate facing forward, and an illusion with the illusion figure when the anti-counterfeit medium is not transparent to the light A medium for preventing forgery, characterized in that it is provided at such a concentration that does not develop.
前記補助要素は、前記基材の一方の面を手前にして前記偽造防止媒体を光に透かしたときの前記補助要素および前記第2要素が重なる領域の濃度が、前記錯視図形を二分割した前記第2要素の濃度と略同一になるような濃度で設けられていることを特徴とする請求項1に記載の偽造防止媒体。   In the auxiliary element, the density of the region where the auxiliary element and the second element overlap when the anti-counterfeit medium is watermarked with light on one side of the base material is divided into two parts of the illusion figure. The anti-counterfeit medium according to claim 1, wherein the medium is provided at a concentration that is substantially the same as the concentration of the second element. 前記錯視図形を二分割した前記第1要素および前記第2要素が略同一の濃度であることを特徴とする請求項1または請求項2に記載の偽造防止媒体。   The forgery prevention medium according to claim 1 or 2, wherein the first element and the second element obtained by dividing the illusion figure into two parts have substantially the same density. 錯視図形を第1要素および第2要素に二分割する画像処理工程と、
前記基材の他方の面に、前記第2要素を形成する第2要素形成工程と、
前記基材の一方の面に、前記第1要素を形成し、さらに前記第2要素に重なるように前記第2要素と同形状の補助要素を形成する第1要素・補助要素形成工程と
を有し、
前記第1要素・補助要素形成工程では、前記補助要素を、前記基材の一方の面を手前にして前記偽造防止媒体を光に透かしたときには前記錯視図形による錯視が発現し、前記偽造防止媒体を光に透かさないときには前記錯視図形による錯視が発現しないような濃度で形成することを特徴とする偽造防止媒体の製造方法。
An image processing step of dividing the illusion figure into a first element and a second element;
A second element forming step of forming the second element on the other surface of the substrate;
A first element / auxiliary element forming step of forming the first element on one surface of the base material, and further forming an auxiliary element having the same shape as the second element so as to overlap the second element; And
In the first element / auxiliary element forming step, when the auxiliary element is watermarked with light on the forgery prevention medium facing one side of the base material, an illusion with the illusion figure appears, and the forgery prevention medium The method for producing a forgery prevention medium is characterized in that the optical illusion pattern is formed at a concentration such that the illusion due to the illusion figure does not appear.
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