JP2018114638A - Counterfeit prevention sheet - Google Patents

Counterfeit prevention sheet Download PDF

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JP2018114638A
JP2018114638A JP2017005504A JP2017005504A JP2018114638A JP 2018114638 A JP2018114638 A JP 2018114638A JP 2017005504 A JP2017005504 A JP 2017005504A JP 2017005504 A JP2017005504 A JP 2017005504A JP 2018114638 A JP2018114638 A JP 2018114638A
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line
display body
minute display
paper
minute
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秀二 佐野
Hideji Sano
秀二 佐野
広之 菊川
Hiroyuki Kikukawa
広之 菊川
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National Printing Bureau
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National Printing Bureau
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Abstract

PROBLEM TO BE SOLVED: To provide a counterfeit prevention sheet that is used for valuables such as banknotes, passports, valuable paper, cards, commodity tags, and art paper.SOLUTION: Lines comprised of watermark and a microscopic display body comprised of watermark are combined on at least part of a substrate of the counterfeit prevention paper, and when observed under the transmitted beam of light, the lines and the microscopic display body are visible as one continuous line. The microscopic display body is formed by oblique lines, and the angle of the lines on the boundary between the lines and the microscopic body is the same as the inclining angle of the oblique lines.SELECTED DRAWING: Figure 1

Description

本発明は、銀行券、パスポート、有価証券、カード、印紙類、商品タグ、美術紙等の貴重品に適用する偽造防止用紙に関するものである。   The present invention relates to anti-counterfeit paper applied to valuable items such as banknotes, passports, securities, cards, stamps, product tags, and art paper.

現在、銀行券、パスポート、有価証券、カード、印紙類、商品タグ、美術紙等の貴重品には様々な偽造防止技術が用いられている。例えば、製紙、印刷技術によって施される偽造防止技術として肉眼では認識できない程度の大きさの表示体(以下「微小表示体」という。)が挙げられる。微小表示体は、複写機、スキャナ等の複写防止対策の一つとして有効であり、肉眼で視認しにくい100μm〜1,000μm程度の微細な文字、記号等を印刷、すき入れで形成する技術である。例えば、すき入れで形成した微小表示体の真偽判別方法は、透過光下ではっきりとすき入れから成る微小表示体は確認できないが、微小表示体を拡大鏡で観察した場合に視認可能であり、更には複写機で複写すると微小表示体は正確に再現されないため、本物か複写物であるか否か容易に判別することができることを特徴とする。   Currently, various anti-counterfeiting techniques are used for valuables such as banknotes, passports, securities, cards, stamps, product tags, and art paper. For example, an anti-counterfeiting technique applied by papermaking and printing techniques includes a display body having a size that cannot be recognized by the naked eye (hereinafter referred to as “microdisplay body”). The micro display is effective as a copy prevention measure for copying machines, scanners, etc., and is a technology that forms fine characters, symbols, etc. of about 100 μm to 1,000 μm, which are difficult to see with the naked eye, by printing and filling. is there. For example, the method for determining the authenticity of a micro-display formed by squeezing cannot confirm a micro-display composed of clear squeeze under transmitted light, but is visible when the micro-display is observed with a magnifying glass. Furthermore, since the minute display is not accurately reproduced when copied by a copying machine, it can be easily discriminated whether it is a genuine or a copy.

例えば、印刷で形成された微小表示体は、シートの適所に印刷する線の少なくとも一部を、拡大すると視認可能で、通常状態では単に線として視認される大きさの文字等で印刷するとともに、この文字等の印刷部分に連なる線の部分の色を文字等の印刷部分と同一濃度に視認されるよう設定したことを特徴とする偽造防止シートが開示されている(例えば、特許文献1参照)。   For example, a minute display formed by printing can be visually recognized by enlarging at least a part of a line to be printed at an appropriate position on the sheet, and printed with characters or the like having a size that can be visually recognized as a line in a normal state. An anti-counterfeit sheet is disclosed in which the color of a line portion connected to a print portion such as characters is set to be visually recognized at the same density as the print portion such as characters (see, for example, Patent Document 1). .

すき入れで形成された微小表示体は、微小紋様がすき入れによって用紙に形成されていることを特徴とする透かし入り用紙が開示されている(例えば、特許文献2参照)。   As for the minute display body formed by insertion, a watermarked sheet is disclosed in which minute patterns are formed on the sheet by insertion (see, for example, Patent Document 2).

特許第3388552号Japanese Patent No. 3388552 特開2005−171429号JP 2005-171429 A

しかしながら、すき入れで形成した微小表示体は、図7に示すような従来の線の一部を微小表示体(5´)で形成した形態において、微小表示体が通常の文字等で形成されていたため、線と微小表示体が同一濃度で視認することが困難であり、違和感が生じ、線内に何らかの情報が施されていることが容易に推測できるものであった。   However, the fine display body formed by interleaving is a form in which a part of the conventional line as shown in FIG. 7 is formed by the fine display body (5 ′), and the fine display body is formed of ordinary characters or the like. For this reason, it is difficult to visually recognize the line and the minute display body at the same density, and a sense of incongruity is generated, and it can be easily estimated that some information is given in the line.

そこで、本発明は、前述した課題の解決を目的とするものであり、線内に微小表示体を違和感なく組み込むことが可能な偽造防止用紙を提供することを目的とする。   SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an anti-counterfeit paper that can solve the above-described problems and can incorporate a minute display body in a line without a sense of incongruity.

本発明の偽造防止用紙は、基材の少なくとも一部にすかしから成る線とすかしから成る微小表示体を組み合わせて、透過光で観察した場合に線と微小表示体が一本の連続線として視認される偽造防止用紙において、微小表示体は斜体で形成されて成り、線と微小表示体の境界の線の角度が斜体の傾斜角度と同一であることを特徴とする。   The anti-counterfeit paper of the present invention is a continuous line consisting of a line and a minute display when observed with transmitted light by combining a line composed of a watermark and a minute display consisting of a watermark on at least a part of the substrate. In the anti-counterfeit paper visually recognized as, the minute display is formed in an italic form, and the angle of the line between the line and the minute display is the same as the inclination angle of the italic.

本発明の偽造防止用紙は、斜体の傾斜角度が20°〜70°の範囲であることを特徴とする。   The anti-counterfeit paper of the present invention is characterized in that the inclination angle of the italic is in the range of 20 ° to 70 °.

本発明の偽造防止用紙は、線と微小表示体の境界において、線と微小表示体が接触又は一部重なっていることを特徴とする。   The anti-counterfeit paper according to the present invention is characterized in that the line and the minute display body are in contact with each other or partially overlapped at the boundary between the line and the minute display body.

本発明の偽造防止用紙の線の幅は、微小表示体の高さに対して50%〜100%の範囲内であることを特徴とする。   The line width of the anti-counterfeit paper according to the present invention is characterized by being in the range of 50% to 100% with respect to the height of the minute display.

本発明の偽造防止用紙の微小表示体は、斜体で形成しているため、線と微小表示体がほぼ同一濃度で視認可能であり、違和感がなく、線内に何らかの情報が施されていることが一見して判断することができないため、偽造防止用紙として適している。   Since the micro-display body of the anti-counterfeit paper of the present invention is formed in italics, the line and the micro-display body are visible at almost the same density, there is no sense of incongruity, and some information is given in the line Can not be judged at first glance, so it is suitable as a forgery prevention paper.

また、本発明の偽造防止用紙の線と微小表示体の境界の線において、線の角度が斜体の傾斜角度と同一、線と微小表示体が接触又は一部重なることで、線と微小表示体の境界の透過光で観察した場合の濃度差が大きくなることを防ぐことが可能となる。   Further, in the line of the anti-counterfeit paper according to the present invention and the boundary line between the minute display bodies, the angle of the line is the same as the inclination angle of the italics, and the line and the minute display body are in contact with each other or partly overlapped. It is possible to prevent an increase in the difference in density when observed with transmitted light at the boundary.

第一の実施形態における偽造防止用紙(1)を示す平面図である。It is a top view which shows the forgery prevention paper (1) in 1st embodiment. 第一の実施形態における偽造防止用紙(1)の連続線(3)を示す拡大図である。It is an enlarged view which shows the continuous line (3) of the forgery prevention paper (1) in 1st embodiment. 斜体の傾斜角度の説明図である。It is explanatory drawing of the inclination-angle of an italic body. 画線(4)の一例を示す図である。It is a figure which shows an example of an image line (4). 第二の実施形態における偽造防止用紙(1)の連続線(3)を示す拡大図である。It is an enlarged view which shows the continuous line (3) of the forgery prevention paper (1) in 2nd embodiment. 第三の実施形態における偽造防止用紙(1)の連続線(3)を示す拡大図である。It is an enlarged view which shows the continuous line (3) of the forgery prevention paper (1) in 3rd embodiment. 従来の微小表示体(5´)を示す図である。It is a figure which shows the conventional micro display body (5 ').

(第一の実施形態)
図1は、第一の実施形態における偽造防止用紙(1)(以下「用紙」という。)の一例を示す平面図である。用紙(1)は、基材(2)上の少なくとも一部に、肉眼で透過光で観察した場合に連続して視認される線(以下「連続線(3)」という。)が形成されている。連続線(3)は、線(4)と微小表示体(5)を組み合わせて形成される。本発明の特徴の一つである微小表示体(5)は、複数の斜体で形成されて成る。なお、図1に示すように、連続線(3)以外の領域には、料額、文字、他の模様等の必要な情報が、公知の印刷方式(例えば、凹版印刷、オフセット印刷等)により施されていてもよい。
(First embodiment)
FIG. 1 is a plan view showing an example of an anti-counterfeit paper (1) (hereinafter referred to as “paper”) in the first embodiment. In the sheet (1), a line (hereinafter referred to as “continuous line (3)”) that is continuously visible when observed with transmitted light with the naked eye is formed on at least a part of the substrate (2). Yes. The continuous line (3) is formed by combining the line (4) and the minute display (5). The micro display body (5) which is one of the features of the present invention is formed of a plurality of italics. As shown in FIG. 1, in areas other than the continuous line (3), necessary information such as fees, characters, and other patterns are obtained by a known printing method (for example, intaglio printing, offset printing). It may be given.

基材(2)は、上質紙、コート紙、アート紙等の用紙を用いることができる。基材(2)及びその色彩は、透過光で観察した場合に光を透過できれば、特に限定されるものではない。   As the base material (2), paper such as high-quality paper, coated paper, and art paper can be used. The base material (2) and the color thereof are not particularly limited as long as they can transmit light when observed with transmitted light.

図2は、本発明の用紙(1)の連続線(3)を示す拡大図である。前述したとおり連続線(3)は、すかしから成る線(4)とすかしから成る微小表示体(5)を組み合わせて形成され、微小表示体(5)は、複数の斜体で形成されて成る。図2に示すように斜体で形成された微小表示体(5)は、規則的に配置され、線(4)と微小表示体(5)は接することがない。   FIG. 2 is an enlarged view showing a continuous line (3) of the paper (1) of the present invention. As described above, the continuous line (3) is formed by combining the line (4) made of watermark and the minute display body (5) made of watermark, and the minute display body (5) is formed by a plurality of italics. Become. As shown in FIG. 2, the minute display bodies (5) formed in italics are regularly arranged, and the line (4) and the minute display bodies (5) do not contact each other.

図2で示す斜体で形成された微小表示体(5)は、「JPN」を繰り返した文字を一例としているが本発明はこれに限定されることなく、文字、記号、数字、ロゴマーク又は特殊記号等でもよい。また、斜体で形成された微小表示体(5)のフォントについても、明朝体、ゴシック体、特殊フォント等、特に限定されることがない。また、微小表示体(5)の大きさについては、100μmから1,000μmまでの範囲、好ましくは300μmから600μmまでである。100μmより小さい場合には、微小表示体自体の作製が困難であり、1,000μmより大きくなると目視で微小表示体が認識できてしまい微小表示体の効果が得られなくなるおそれが生じる。なお、微小表示体の大きさとは、文字の高さ及び/又は幅の長さのことである。   The minute display body (5) formed in italics shown in FIG. 2 is an example of characters in which “JPN” is repeated, but the present invention is not limited to this, and characters, symbols, numbers, logo marks or special characters are not limited thereto. It may be a symbol or the like. Further, the font of the minute display (5) formed in italic is not particularly limited, such as Mincho, Gothic, and special fonts. Further, the size of the micro display body (5) is in the range from 100 μm to 1,000 μm, preferably from 300 μm to 600 μm. If it is smaller than 100 μm, it is difficult to produce the micro display body itself. If it exceeds 1,000 μm, the micro display body can be visually recognized and the effect of the micro display body may not be obtained. Note that the size of the minute display means the height of the character and / or the length of the width.

斜体で形成された微小表示体(5)は、傾斜角度が20°〜70°の範囲であることが好ましい。ここでいう傾斜角度とは、図3に示すように微小表示体(5)が傾いた角度(θ)のことである。傾斜角度が20°よりも小さいと後述する線面積率が稼ぎ難くなり、70°よりも大きいと文字等から成る微小表示体(5)が拡大鏡で把握し難い形態となる。   The minute display body (5) formed of an italic body preferably has an inclination angle in the range of 20 ° to 70 °. The inclination angle here is an angle (θ) at which the minute display (5) is inclined as shown in FIG. If the inclination angle is smaller than 20 °, the line area ratio described later is difficult to earn, and if it is larger than 70 °, the fine display body (5) composed of characters and the like is difficult to grasp with a magnifying glass.

図2で示す線(4)は、直線を一例として示しているが、本発明はこれに限定されることなく、図4(a)に示すように直線、図4(b)に示すように曲線、図4(c)に示すように破線、図4(d)に示すように円形、その他彩紋模様等、特に限定されるものではない。また、線(4)の幅は、100μmから1,000μmまでの範囲、好ましくは150μmから600μmまでである。   The line (4) shown in FIG. 2 shows a straight line as an example, but the present invention is not limited to this, and the straight line as shown in FIG. 4 (a), as shown in FIG. 4 (b). Curves, broken lines as shown in FIG. 4 (c), circles as shown in FIG. 4 (d), and other colored patterns are not particularly limited. The width of the line (4) is in the range from 100 μm to 1,000 μm, preferably from 150 μm to 600 μm.

図7に示した従来の微小表示体(5´)は、傾斜のない文字で形成されているため、本発明のすかしから成る微小表示体(5)よりもすかしから成る線の面積が低い状態になり易い。つまり、本発明の微小表示体(5)は斜体であるため単位面積当たりの線の面積率が稼ぎ易く、非線領域を狭くし易いメリットが得られる。よって、線(4)の領域と微小表示体(5)の領域で濃度調整をしなくても透過光で観察した場合に線(4)と微小表示体(5)が一本の連続線として視認し易い状況になる。   Since the conventional minute display body (5 ') shown in FIG. 7 is formed with characters having no inclination, the area of the line composed of the watermark is smaller than that of the minute display body (5) of the present invention. It tends to be low. That is, since the micro display body (5) of the present invention is an italic body, it is easy to increase the area ratio of lines per unit area, and the merit of easily narrowing the non-linear region can be obtained. Therefore, the line (4) and the minute display body (5) are formed as one continuous line when observed with transmitted light without adjusting the density in the line (4) area and the minute display body (5) area. It becomes easy to see.

線(4)と微小表示体(5)の関係について下記に説明する。線(4)の幅は、微小表示体(5)の高さと同一以下であることが好ましい。さらに、好ましくは、線(4)の幅は、微小表示体(5)の高さに対して50%〜100%の範囲内である。これは、線(4)と微小表示体(5)の単位面積当たりの面積率は、線(4)>微小表示体(5)の関係であるため、線(4)の幅が微小表示体(5)の高さに対して50%より小さい場合、又は、100%よりも大きい場合は、透過光で観察した場合に線(4)と微小表示体(5)が一本の連続線(3)として視認し難い形態となる。   The relationship between the line (4) and the minute display body (5) will be described below. The width of the line (4) is preferably equal to or less than the height of the minute display (5). Further, preferably, the width of the line (4) is in the range of 50% to 100% with respect to the height of the minute display body (5). This is because the area ratio per unit area of the line (4) and the minute display body (5) is such that the line (4)> the minute display body (5). Therefore, the width of the line (4) is smaller than the minute display body. When the height of (5) is smaller than 50% or larger than 100%, the line (4) and the minute display body (5) are formed as a single continuous line ( It becomes a form that is difficult to visually recognize as 3).

また、前述したとおり、線(4)と微小表示体(5)の単位面積当たりの面積率は、線(4)>微小表示体(5)の関係であるため、線(4)の色彩濃度は、微小表示体(5)の色彩濃度に対して同一濃度以下が好ましい。さらに、好ましくは、線(4)の色彩濃度は、微小表示体(5)の色彩濃度よりも低濃度である。   Further, as described above, the area ratio per unit area of the line (4) and the minute display body (5) has the relationship of the line (4)> the minute display body (5). Is preferably equal to or less than the color density of the fine display (5). Further preferably, the color density of the line (4) is lower than the color density of the microdisplay (5).

本発明のすかしから成る線(4)とすかしから成る微小表示体(5)の作製は、従来のすかしを作製する方法、例えば、ダンディーロール等で形成することができる。すかしの種類は白すかし、黒すかし、白黒すかしのいずれでもよく、特に限定されるものではない。   Production of the line (4) comprising the watermark and the minute display body (5) comprising the watermark of the present invention can be performed by a conventional method of producing a watermark, for example, a dandy roll. The type of watermark may be any of white watermark, black watermark, and black and white watermark, and is not particularly limited.

(第一の実施形態の作用)
本発明の偽造防止用紙の線(4)と微小表示体(5)は、透過光で観察した場合に連続線(3)として視認でき、違和感がなく、線内に何らかの情報が施されていることが一見して判断することができない。また、微小表示体(5)を拡大鏡で観察した場合に微小表示体(5)の文字等がはっきりと視認できる。また、複写機で複製物を作製した場合に微小表示体(5)は正確に再現することができず複製物であることが容易に判断することができる。
(Operation of the first embodiment)
The line (4) and the minute display body (5) of the anti-counterfeit paper of the present invention can be visually recognized as a continuous line (3) when observed with transmitted light, and there is no sense of incongruity, and some information is given in the line. I cannot judge at first glance. Further, when the fine display body (5) is observed with a magnifying glass, the characters of the fine display body (5) can be clearly recognized. In addition, when a duplicate is produced by a copying machine, the minute display (5) cannot be accurately reproduced, and it can be easily determined that the duplicate is a duplicate.

(第二の実施形態)
図5は、第三の実施形態における用紙(1)の連続線(3)を示す拡大図である。なお、第一の実施形態と同様の内容についての一部の説明は、省略する。
(Second embodiment)
FIG. 5 is an enlarged view showing a continuous line (3) of the paper (1) in the third embodiment. A part of the description of the same contents as those in the first embodiment will be omitted.

第一の実施形態と同様に、第二の実施形態の用紙(1)の連続線(3)は、線(4)と微小表示体(5)を組み合わせて形成され、微小表示体(5)は、複数の斜体で形成されて成る。図5に示すように斜体で形成された微小表示体(5)は、規則的に配置され、線(4)と微小表示体(5)は接することがなく、線(4)と微小表示体(5)の境界(6)の線(4)において、線(4)の角度が微小表示体(5)の斜体の傾斜角度と同一である。   Similar to the first embodiment, the continuous line (3) of the paper (1) of the second embodiment is formed by combining the line (4) and the minute display (5), and the minute display (5). Is formed of a plurality of italics. As shown in FIG. 5, the minute display bodies (5) formed in italics are regularly arranged, and the line (4) and the minute display body (5) are not in contact with each other, and the line (4) and the minute display body are not in contact with each other. In the line (4) at the boundary (6) of (5), the angle of the line (4) is the same as the inclination angle of the italic body of the minute display body (5).

(第二の実施形態の作用)
第二の実施形態における用紙(1)は、線(4)と微小表示体(5)の境界(6)の線(4)において、線(4)の角度が微小表示体(5)の斜体の傾斜角度と同一であるため、透過光で観察した場合に線(4)と微小表示体(5)の境界の濃度差が大きくなることを防ぎ、境界の違和感をなくすことができる。
(Operation of the second embodiment)
In the sheet (1) in the second embodiment, the line (4) at the boundary (6) between the line (4) and the minute display body (5) has an angle of the line (4) and the italic body of the minute display body (5). Therefore, it is possible to prevent the difference in density at the boundary between the line (4) and the minute display body (5) from increasing when observed with transmitted light, and to eliminate the uncomfortable feeling at the boundary.

(第三の実施形態)
図5は、第三の実施形態における用紙(1)の連続線(3)を示す拡大図である。なお、第二の実施形態と同様の内容についての一部の説明は、省略する。
(Third embodiment)
FIG. 5 is an enlarged view showing a continuous line (3) of the paper (1) in the third embodiment. Note that a part of the description about the same contents as in the second embodiment will be omitted.

第二の実施形態と同様に、第三の実施形態の用紙(1)の連続線(3)は、線(4)と微小表示体(5)を組み合わせて形成され、微小表示体(5)は、複数の斜体で形成され、線(4)と微小表示体(5)の境界(6)の線(4)において、線(4)の角度が微小表示体(5)の斜体の傾斜角度と同一である。図6に示すように斜体で形成された微小表示体(5)は、規則的に配置され、線(4)と微小表示体(5)の境界(6)に当たる線(4)と微小表示体(5)同士が接触又は一部重なっている。   Similar to the second embodiment, the continuous line (3) of the paper (1) of the third embodiment is formed by combining the line (4) and the minute display body (5), and the minute display body (5). Is formed of a plurality of italics, and in the line (4) at the boundary (6) between the line (4) and the minute display (5), the angle of the line (4) is the inclination angle of the italic of the minute display (5) Is the same. As shown in FIG. 6, the minute display body (5) formed in italics is regularly arranged, and the line (4) and the minute display body which hit the boundary (6) between the line (4) and the minute display body (5). (5) They are in contact with each other or partly overlapped.

(第三の実施形態の作用)
第三の実施形態における用紙(1)は、線(4)と微小表示体(5)が接触又は一部重なっているため、透過光で観察した場合に線(4)と微小表示体(5)の境界の濃度差が大きくなることを防ぎ、境界の違和感をなくすことができる。
(Operation of the third embodiment)
In the sheet (1) in the third embodiment, the line (4) and the minute display body (5) are in contact with each other or partly overlapped. ) Can be prevented from becoming large, and the uncomfortable feeling at the boundary can be eliminated.

1 用紙
2 基材
3、3´ 連続線
4、4´ 線
5、5´ 微小表示体
6 境界
θ 角度
1 Paper 2 Substrate 3, 3 ′ Continuous line 4, 4 ′ line 5, 5 ′ Micro display 6 Boundary θ angle

Claims (4)

基材の少なくとも一部にすかしから成る線とすかしから成る微小表示体を組み合わせて、透過光で観察した場合に前記線と前記微小表示体が一本の連続線として視認される偽造防止用紙において、
前記微小表示体は斜体で形成されて成り、
前記線と前記微小表示体の境界の前記線の角度が前記斜体の傾斜角度と同一であることを特徴とする偽造防止用紙。
Combining at least a part of a substrate with a line composed of a watermark and a minute display composed of a watermark, and when observed with transmitted light, the line and the minute display are prevented from being counterfeited as a single continuous line In paper
The minute display body is formed of an italic type,
An anti-counterfeit paper characterized in that the angle of the line at the boundary between the line and the minute display body is the same as the inclination angle of the italic body.
前記斜体の傾斜角度が20°〜70°の範囲であることを特徴とする請求項1記載の偽造防止用紙。   The anti-counterfeit paper according to claim 1, wherein an inclination angle of the italic body is in a range of 20 ° to 70 °. 前記線と前記微小表示体の境界において、
前記線と前記微小表示体が接触又は一部重なっていることを特徴とする請求項1又は2記載の偽造防止用紙。
At the boundary between the line and the minute display body,
The anti-counterfeit paper according to claim 1 or 2, wherein the line and the minute display are in contact with each other or partly overlapped.
前記線の幅は、前記微小表示体の高さに対して50%〜100%の範囲内であることを特徴とする請求項1から3までのいずれか一項記載の偽造防止用紙。   The forgery prevention paper according to any one of claims 1 to 3, wherein a width of the line is in a range of 50% to 100% with respect to a height of the minute display body.
JP2017005504A 2017-01-17 2017-01-17 Counterfeit prevention sheet Pending JP2018114638A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06183192A (en) * 1992-12-18 1994-07-05 Toppan Moore Co Ltd Forgery preventive sheet
JP2005171429A (en) * 2003-12-12 2005-06-30 National Printing Bureau Watermarked paper
JP2007015320A (en) * 2005-07-11 2007-01-25 National Printing Bureau Printed matter with character on part of chromatic crest
JP2013018177A (en) * 2011-07-11 2013-01-31 National Printing Bureau Copy protection printed matter
US20160339733A1 (en) * 2014-01-20 2016-11-24 De La Rue International Limited Security elements and methods of their manufacture

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06183192A (en) * 1992-12-18 1994-07-05 Toppan Moore Co Ltd Forgery preventive sheet
JP2005171429A (en) * 2003-12-12 2005-06-30 National Printing Bureau Watermarked paper
JP2007015320A (en) * 2005-07-11 2007-01-25 National Printing Bureau Printed matter with character on part of chromatic crest
JP2013018177A (en) * 2011-07-11 2013-01-31 National Printing Bureau Copy protection printed matter
US20160339733A1 (en) * 2014-01-20 2016-11-24 De La Rue International Limited Security elements and methods of their manufacture

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