JP2005085094A - Counterfeit-preventing medium and counterfeit-preventing sticker - Google Patents

Counterfeit-preventing medium and counterfeit-preventing sticker Download PDF

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JP2005085094A
JP2005085094A JP2003318211A JP2003318211A JP2005085094A JP 2005085094 A JP2005085094 A JP 2005085094A JP 2003318211 A JP2003318211 A JP 2003318211A JP 2003318211 A JP2003318211 A JP 2003318211A JP 2005085094 A JP2005085094 A JP 2005085094A
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hologram
layer
counterfeit
embossed
counterfeit medium
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JP4487521B2 (en
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Satoshi Gocho
智 牛腸
Noriyuki Ito
典之 伊藤
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Toppan Inc
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Toppan Printing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a counterfeit-preventing medium which has an iridescent multilayered film minutely embossed, which changes the reflection color in accordance with variation of a viewing angle, and is easily visually decided to be authentic and makes wrong actions, such as forging, counterfeiting, and altering difficult, and to provide a counterfeit preventing sticker using the same. <P>SOLUTION: An embossed part like a relief type hologram or a hologram, embossed with minute ruggedness related to a diffraction grating, is provided in at least a part of an iridescent multilayered film, formed by alternately laminating two or more kinds of thin films. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、目視角度の変化に応じて反射色に変化が生じる虹彩性多層フィルムに微小な凹凸がエンボスされてなる偽造防止媒体及びこの偽造防止媒体を用いた偽造防止シールに係り、特に目視による真偽の判定が容易であり、かつ偽造・改ざん・変造を困難とする偽造防止媒体および偽造防止シールに関するものである。   The present invention relates to an anti-counterfeit medium in which minute irregularities are embossed on an iris multilayer film in which a reflection color changes according to a change in visual angle, and an anti-counterfeit seal using the anti-counterfeit medium, particularly by visual inspection. The present invention relates to an anti-counterfeit medium and an anti-counterfeit seal that make it easy to determine authenticity and make counterfeiting, falsification, and alteration difficult.

従来、偽造を防止する手段としては、例えば、物品そのものを真似することが困難なものとするとか、或いは真似することが困難なものを本物であることの証明として物品に取りつけることにより、本物と偽物を区別できるようにする手段がある。後者の代表的なものとしては、近年多用されているレリーフ型ホログラム、回折格子、リップマン型ホログラムなどのホログラムを利用した偽造防止手段がある。ここで利用されるホログラムの中で、例えばレリーフ型ホログラムは、干渉縞を微細な凹凸状に再現したものであり、ここで生じる光の回折と干渉により見る角度(すなわち、ホログラムを支持している角度)に応じて固有のカラーシフト(反射光の色変化)を起こす。従って、このようなホログラムを偽造防止の一手段として用い、その部分におけるカラーシフトの有無を確認することにより、真正物であるか否かを容易に判定でき、真偽の確認が容易に行われるようになる。ところが、近年では上述のようなホログラムは、ホログラム原理やホログラムを構成する層などの構造が簡単であるため、偽造されやすくなりつつあることから、これによる偽造防止効果も薄れてきている。   Conventionally, as means for preventing counterfeiting, for example, it is difficult to imitate the article itself, or it is difficult to imitate the article itself by attaching it to the article as proof that it is genuine. There is a means to be able to distinguish fake. Typical examples of the latter include anti-counterfeiting means using holograms such as relief holograms, diffraction gratings, and Lippmann holograms that are frequently used in recent years. Among the holograms used here, for example, a relief hologram is a reproduction of interference fringes in the form of fine irregularities, and the viewing angle by the diffraction and interference of light generated here (that is, the hologram is supported). Inherent color shift (color change of reflected light) occurs according to (angle). Therefore, by using such a hologram as a means for preventing counterfeiting and confirming the presence or absence of a color shift in that portion, it is possible to easily determine whether or not it is authentic, and authenticity can be easily confirmed. It becomes like this. However, in recent years, since the hologram as described above has a simple hologram principle and a structure such as a layer constituting the hologram, it is becoming easy to forge, and thus the forgery prevention effect due to this is also fading.

これに対し、このホログラムと同様にカラーシフト(反射光の色変化)の効果を有するものとして、セラミックスや金属などからなり、光学特性の異なる薄膜を基材上に多層に積層した多層薄膜構造物が提案されている(例えば、特許文献1参照。)。   On the other hand, as this hologram has the effect of color shift (color change of reflected light), it is a multilayer thin film structure in which thin films made of ceramics or metal and having different optical properties are laminated in layers on a substrate. Has been proposed (see, for example, Patent Document 1).

この多層薄膜構造物は薄膜の光学特性と膜厚との組合せにより得られる光の干渉作用を利用してカラーシフトが得られるようにしたものであり、特定の波長域に反射・透過特性を有し、観察する位置を違えることによりこの反射・透過特性が変化し、見える色が異なるようになっている。従って、このような多層薄膜構造物を偽造されたくないものの一部に担持させておき、真偽の判定が必要な時に対象物のカラーシフトの有無を確認することにより、真正物であるか否かを容易に判定することができる。この時、この多層薄膜構造物はそれを形成する基材が透明フィルムのままでは色の変化が判りづらいこともあって、多層薄膜の下地として黒等の濃色の着色層または金属反射膜を付加する場合がある。   This multilayer thin film structure is designed to obtain a color shift by utilizing the interference effect of light obtained by the combination of the optical characteristics and film thickness of the thin film, and has reflection / transmission characteristics in a specific wavelength range. However, by changing the observation position, the reflection / transmission characteristics change, and the visible colors are different. Therefore, whether such a multilayer thin film structure is genuine is carried on a part of the object that is not to be counterfeited, and whether or not the object is color-shifted is checked by checking whether or not the object is color-shifted. Can be easily determined. At this time, since this multilayer thin film structure is difficult to understand the color change if the base material forming the transparent thin film is a transparent film, a dark colored layer such as black or a metal reflective film is used as the base of the multilayer thin film. May be added.

これらのホログラムや多層薄膜構造物におけるカラーシフト(反射光の色変化)は、目視角度の違いによる色の変化が偽造物に対して真偽の判定を可能とし、特にコピー機、カラーコピー機などを利用して不正に複写をしようとした場合にはこのような光学特性までもは再現することが不可能であるため、偽造・変造を困難とし、さらには偽造・変造を諦めさせるよう作用する。   The color shift (color change of reflected light) in these holograms and multilayer thin film structures makes it possible to determine whether a color change due to a difference in viewing angle is true or false with respect to a counterfeit product, particularly copying machines, color copying machines, etc. It is impossible to reproduce even such optical characteristics when trying to copy illegally by using, so that counterfeiting / alteration is difficult, and further acts of giving up counterfeiting / alteration .

このような効果が期待できるようにするために、最近ではシール、または転写箔、転写シート等への展開が図られている。例えば、目視角度の変化に応じて反射色に変化が生じる多層薄膜層やホログラム等形成層をその一部に担持し、これらを被貼着物に貼着、または転写させることにより、所望の物品にホログラム等を形成せしめ、上記した各特性を発揮するようにしている。このような場合、さらにより高いセキュリティの付加として、特にその層構成を考慮し、シールを剥離困難とするとか、或いは脆性シールのような剥離後再生困難となるように構成し、一度貼り付けた後に剥離しようとするとホログラム等の一
部もしくは全体が破壊されることで、偽造ができなくなるだけでなく、改竄などの操作が加えられたことが一目で判別できるようにしている。
In order to be able to expect such an effect, the development to a seal or transfer foil, a transfer sheet, etc. is aimed at recently. For example, a multilayer thin film layer or hologram forming layer that changes in reflection color according to a change in viewing angle is supported on a part thereof, and these are attached to an adherend or transferred to a desired article. A hologram or the like is formed to exhibit the above-described characteristics. In such a case, as a further addition of security, considering the layer structure in particular, it is difficult to peel off the seal, or it is configured to be difficult to regenerate after peeling, such as a brittle seal, and pasted once. If an attempt is made to peel off later, a part or the whole of the hologram or the like is destroyed, so that it becomes impossible to forge, and it is possible to determine at a glance that manipulation such as tampering has been applied.

さらに、多層薄膜のカラーシフト効果を利用し、多層薄膜に一定角度のエンボスをつけることにより、一面上にて様々な色に見えるようにした偽造防止媒体もある(特許文献2参照)。   Furthermore, there is also a forgery prevention medium in which various colors can be seen on one surface by embossing the multilayer thin film at a certain angle by using the color shift effect of the multilayer thin film (see Patent Document 2).

しかしながら、基材にセラミックスや金属などからなり、光学特性の異なる薄膜を多層に積層した多層薄膜層の安定製造は難しく、特に広い面積を所定の膜厚にて何層にも形成するためには、コスト高になる問題がある。
特開平7−146650号公報 特開平11−224050号公報
However, it is difficult to stably manufacture a multilayer thin film layer made of ceramics or metal on a base material, and thin films with different optical properties are laminated in multiple layers. There is a problem of high costs.
Japanese Patent Laid-Open No. 7-146650 Japanese Patent Laid-Open No. 11-2224050

上述の問題点に鑑みなされた本発明は、多層薄膜の薄膜構成材料としてセラミックスや金属などではなく、二種以上のプラスチックフィルムを多層に積層して一定の条件下で延伸して得られる、所謂カラーシフト効果を持つ虹彩性多層フィルムを使用し、この虹彩性多層フィルムの少なくとも一部にレリーフ型ホログラムか回折格子に係る微小な凹凸をエンボスして設けてなる、真偽判定が目視にて容易に可能であるとともに、偽造、変造、改ざんなどの不正行為が困難な偽造防止媒体およびこの偽造防止媒体を用いた偽造防止シールを提供することを課題とする。   The present invention made in view of the above-mentioned problems is a so-called multilayer thin film constituent material obtained by laminating two or more types of plastic films in multiple layers and stretching them under certain conditions, rather than ceramics or metal. Using an iris multi-layer film with a color shift effect, and embossing a relief hologram or a fine irregularity on the diffraction grating on at least a part of this multi-layer film, it is easy to visually check the authenticity It is another object of the present invention to provide a forgery prevention medium that is capable of being counterfeited such as forgery, alteration, and alteration, and a forgery prevention seal using the forgery prevention medium.

上記課題を達成するためになされ、請求項1に記載の発明は、二種またはそれ以上の種類の薄膜が交互に積層されてなる虹彩性多層フィルムの少なくとも一部に、レリーフ型ホログラムか回折格子に係る微小な凹凸がエンボスされてなるホログラム等エンボス部が設けられていることを特徴とする偽造防止媒体である。   In order to achieve the above object, the invention according to claim 1 is characterized in that a relief hologram or diffraction grating is formed on at least a part of an iris multilayer film in which two or more kinds of thin films are alternately laminated. An anti-counterfeit medium characterized by being provided with an embossed portion such as a hologram formed by embossing minute irregularities according to the above.

また、請求項2に記載の発明は、二種またはそれ以上の種類の薄膜が交互に積層されてなる虹彩性多層フィルム上にホログラム等形成層が設けられており、該ホログラム等形成層の少なくとも一部に、レリーフ型ホログラムか回折格子に係る微小な凹凸がエンボスされてなるホログラム等エンボス部が設けられていることを特徴とする偽造防止媒体である。   In the invention according to claim 2, a hologram etc. forming layer is provided on an iris multilayer film formed by alternately laminating two or more kinds of thin films, and at least the hologram etc. forming layer is provided. An anti-counterfeit medium characterized in that a relief hologram or an embossed portion such as a hologram formed by embossing minute irregularities related to a diffraction grating is provided.

さらにまた、請求項3に記載の発明は、請求項1または2に記載の偽造防止媒体において、前記ホログラム等エンボス部上に透明保護層が設けられ、該透明保護層上の一部または全部に光吸収層が設けられていることを特徴とする。   Furthermore, the invention according to claim 3 is the forgery prevention medium according to claim 1 or 2, wherein a transparent protective layer is provided on the embossed portion such as the hologram, and a part or all of the transparent protective layer is provided. A light absorption layer is provided.

さらにまた、請求項4に記載の発明は、請求項1乃至3のいずれかに記載の偽造防止媒体において、前記ホログラム等エンボス部上の一部に、パターン状の光吸収層が設けられ、さらにその上層に光反射層が設けられていることを特徴とする。   Furthermore, the invention according to claim 4 is the forgery prevention medium according to any one of claims 1 to 3, wherein a patterned light absorption layer is provided on a part of the embossed portion such as the hologram, A light reflection layer is provided on the upper layer.

さらにまた、請求項5に記載の発明は、請求項4に記載の偽造防止媒体において、前記光反射層は、前記ホログラム等エンボス部の前記微小な凹凸の形成領域に部分的に設けられていることを特徴とする。   Furthermore, in the invention according to claim 5, in the forgery prevention medium according to claim 4, the light reflecting layer is partially provided in the formation area of the minute unevenness of the embossed portion such as the hologram. It is characterized by that.

さらにまた、請求項6に記載の発明は、請求項1乃至5のいずれかに記載の偽造防止媒体にさら粘着層を設けたことを特徴とする偽造防止シールである。   Furthermore, the invention described in claim 6 is a forgery-preventing seal characterized in that an anti-counterfeit medium according to any one of claims 1 to 5 is further provided with an adhesive layer.

本発明の偽造防止媒体および偽造防止シールは、目視角度の違いによって色が変化する虹彩性多層フィルムの少なくとも一部にレリーフ型ホログラムか回折格子に係る微小な凹凸を設けてあり、必要に応じてパターン状に光吸収層を設け、さらにフィルム全面に光反射層を設けることで、ホログラムが鮮明に目視できると共に、目視角度の違いにより所定のパターン状に色が変化して観察されるようになるので、カラーコピー機などによる偽造・改ざん・変造などの不正行為を未然に防ぐことが出来、さらにはレリーフ型ホログラムか回折格子に係る微小な凹凸が施されていることより、カラーコピー機などでの再現は困難となり、より一層の偽造防止効果を高めることが出来る。   The anti-counterfeit medium and the anti-counterfeit seal of the present invention are provided with minute reliefs on relief holograms or diffraction gratings on at least a part of the iris multilayer film whose color changes depending on the viewing angle. By providing a light-absorbing layer in a pattern and further providing a light-reflecting layer on the entire film surface, the hologram can be clearly observed and the color changes to a predetermined pattern due to the difference in viewing angle. Therefore, it is possible to prevent fraudulent acts such as counterfeiting, falsification, and alteration by a color copier, etc., and furthermore, since there are relief irregularities on the relief hologram or diffraction grating, Is difficult to reproduce, and the effect of preventing forgery can be further enhanced.

以下、図面を用いて本発明の実施の形態を詳細に説明する。図1は本発明の偽造防止媒体の一実施形態を示す平面説明図であり、図2は図1に示す偽造防止媒体のX−X線における断面図である。図3は本発明の偽造防止媒体の他の実施形態に係る断面説明図である。図4は本発明の偽造防止媒体の他の実施形態を示す平面説明図であり、図5は図4に示す偽造防止媒体のX−X線における断面図である。また、図6は本発明の偽造防止シールの一実施形態を示す平面説明図であり、図7は図6に示す偽造防止シールのX−X線における断面図である。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory plan view showing an embodiment of the anti-counterfeit medium of the present invention, and FIG. 2 is a sectional view of the anti-counterfeit medium shown in FIG. FIG. 3 is a cross-sectional explanatory view according to another embodiment of the forgery prevention medium of the present invention. FIG. 4 is an explanatory plan view showing another embodiment of the anti-counterfeit medium of the present invention, and FIG. 5 is a cross-sectional view taken along line XX of the anti-counterfeit medium shown in FIG. 6 is an explanatory plan view showing an embodiment of the anti-counterfeit seal according to the present invention, and FIG. 7 is a cross-sectional view taken along line XX of the anti-counterfeit seal shown in FIG.

図1並びに図2に示す本発明の偽造防止媒体1は、二種またはそれ以上の薄膜が交互に積層されてなる虹彩性多層フィルム11の一部に、レリーフ型ホログラムか回折格子に係る微小な凹凸がエンボスされてなるホログラム等エンボス部12が設けられている。また、図3に示す本発明の偽造防止媒体1’は、二種またはそれ以上の薄膜が交互に積層されてなる虹彩性多層フィルム11の上にホログラム等形成層13が設けられており、このホログラム等形成層13の一部にはレリーフ型ホログラムか回折格子に係る微小な凹凸がエンボスされてなるホログラム等エンボス部12が設けられている。   The anti-counterfeit medium 1 of the present invention shown in FIG. 1 and FIG. 2 is a microscopic film related to a relief hologram or diffraction grating on a part of an iris multilayer film 11 in which two or more kinds of thin films are alternately laminated. An embossed portion 12 such as a hologram is provided in which irregularities are embossed. Further, the anti-counterfeit medium 1 ′ of the present invention shown in FIG. 3 is provided with a hologram-forming layer 13 on an iris multilayer film 11 in which two or more kinds of thin films are alternately laminated. A hologram or the like embossed portion 12 is formed on a part of the hologram or the like forming layer 13 by embossing a relief hologram or a minute unevenness on the diffraction grating.

また、図4並びに図5に示す本発明の偽造防止媒体2は、二種またはそれ以上の薄膜が交互に積層されてなる虹彩性多層フィルム21上にホログラム等形成層23が設けられており、このホログラム等形成層23の一部にレリーフ型ホログラムか回折格子に係る微小な凹凸がエンボスされてなるホログラム等エンボス部22が設けられており、さらにその上に光吸収層24がパターン状に設けられており、さらにその上に光反射層25が全面に設けられている。   The anti-counterfeit medium 2 of the present invention shown in FIGS. 4 and 5 is provided with a hologram-forming layer 23 on an iris multilayer film 21 in which two or more thin films are alternately laminated, A hologram or the like embossed portion 22 is formed on a part of the hologram or the like forming layer 23 by embossing a relief hologram or a minute unevenness related to the diffraction grating, and a light absorbing layer 24 is provided in a pattern on the embossed portion 22. Furthermore, a light reflection layer 25 is provided on the entire surface.

一方、図6並びに図7に示す本発明の偽造防止シール3は、二種またはそれ以上の薄膜が交互に積層されてなる虹彩性多層フィルム31上にホログラム等形成層33が設けられており、このホログラム等形成層33の一部にレリーフ型ホログラムか回折格子に係る微小な凹凸がエンボスされてなるホログラム等エンボス部32が設けられており、さらにその上には光吸収層34がパターン状に設けられており、またその上には光反射層35がパターン状に設けられており、さらにその上には粘着層36が設けられている。   On the other hand, the anti-counterfeit seal 3 of the present invention shown in FIG. 6 and FIG. 7 is provided with a hologram etc. formation layer 33 on an iris multilayer film 31 in which two or more kinds of thin films are alternately laminated. A part of this hologram etc. forming layer 33 is provided with an embossed part 32 such as a relief hologram or embossed with minute irregularities related to the diffraction grating, and further a light absorbing layer 34 is formed in a pattern on it. In addition, a light reflection layer 35 is provided in a pattern shape thereon, and an adhesive layer 36 is provided thereon.

上記各虹彩性多層フィルム11、21、31は、屈折率の異なる2種類以上の薄膜が交互に多層に積層されてなるもので、さらに具体的には屈折率の異なる2種類以上のポリマー薄膜を交互に多層に積層したものである。薄膜の構成材料として用いられるポリマーとしては、高屈折率ポリマーとしてはポリエチレンナフタレート(1.63=屈折率n:以下同じ)、ポリカーボネート(1.59)、ポリスチレン(1.59)、ポリエチレンテレフタレート(1.58)などが挙げられ、また低屈折率ポリマーとしてはナイロン(1.53)、ポリメチルメタアクリレート(1.49)、ポリメチルペンテン(1.46)、フッ素系ポリメチルメタアクリレート(1.4)などが挙げられる。これらのポリマーの中から高屈折率材料より少なくとも一種、低屈折率材料より少なくとも一種を選択し、
それらを所定の厚さで交互に積層させることにより、特定の波長の可視光に対する特有の吸収あるいは反射特性を示し、目視角度の変化に応じて反射色に変化が生じる虹彩性多層フィルムが得られる。
Each of the above-mentioned iris multi-layer films 11, 21 and 31 is formed by alternately laminating two or more types of thin films having different refractive indexes, and more specifically, two or more types of polymer thin films having different refractive indexes. It is alternately laminated in multiple layers. As a polymer used as a constituent material of the thin film, as a high refractive index polymer, polyethylene naphthalate (1.63 = refractive index n: the same applies hereinafter), polycarbonate (1.59), polystyrene (1.59), polyethylene terephthalate ( 1.58), and examples of the low refractive index polymer include nylon (1.53), polymethyl methacrylate (1.49), polymethylpentene (1.46), and fluorine-based polymethyl methacrylate (1). .4). From these polymers, select at least one from a high refractive index material, at least one from a low refractive index material,
By alternately laminating them at a predetermined thickness, an iris multi-layer film is obtained that exhibits unique absorption or reflection characteristics for visible light of a specific wavelength and that changes in reflection color according to changes in viewing angle. .

一方、ホログラム等形成層13、23、33は、光の干渉を利用したレリーフ型ホログラムか回折格子に係る微小な凹凸を形成し、立体画像の表現や見る角度によりパターンが変化するチェンジングを生じる表示部を形成するための層である。このレリーフ型のホログラム(回折格子)は光学的な撮影方式により、微細な凹凸パターンからなるレリーフ型のマスター版を作製した後、電気メッキ法により前記マスター版からパターンを複製したプレス版を得、このプレス版をポリカーボネート樹脂等からなる層に押し当てて賦型することによって得られる。前記ホログラム等形成層13、23、33へのレリーフ型ホログラムもこのような方法、すなわちプレス版を加熱してホログラム等形成層13、23、33に押し当て、ホログラム等エンボス部12、22、32を形成する方法が採られる。それゆえ、ホログラム等形成層13、23、33は熱による成形性が良好で、プレスムラが生じ難く、明るい再生像が得られる材料によって構成する。具体的には、ポリカーボネート樹脂、ポリスチレン樹脂、ポリ塩化ビニル樹脂などの熱可塑性樹脂、不飽和ポリエステル樹脂、メラミン樹脂、エポキシ樹脂などの熱硬化性樹脂、あるいは、ラジカル重合性不飽和基を有する紫外線や電子線硬化性樹脂を単独あるい複合して用いることができる。また、上記以外ものでも、ホログラム等のレリーフパターンが形成可能で安定性を有する材料であれば使用可能である。   On the other hand, the hologram etc. forming layers 13, 23, and 33 form relief irregularities using light interference or minute irregularities related to the diffraction grating, and display that changes in the pattern depending on the representation of the stereoscopic image and the viewing angle. It is a layer for forming a part. This relief-type hologram (diffraction grating) is produced by producing a relief-type master plate having a fine uneven pattern by an optical photographing method, and then obtaining a press plate by copying the pattern from the master plate by electroplating, It is obtained by pressing the press plate against a layer made of polycarbonate resin or the like and shaping. The relief type hologram to the hologram etc. forming layers 13, 23, 33 is also applied in this manner, that is, the press plate is heated and pressed against the hologram etc. forming layers 13, 23, 33, and the hologram etc. embossed parts 12, 22, 32 are applied. The method of forming is taken. Therefore, the hologram layer 13, 23, 33 is made of a material that has good moldability by heat, hardly causes press unevenness, and can obtain a bright reproduced image. Specifically, thermoplastic resins such as polycarbonate resins, polystyrene resins, and polyvinyl chloride resins, thermosetting resins such as unsaturated polyester resins, melamine resins, and epoxy resins, or ultraviolet rays having radically polymerizable unsaturated groups An electron beam curable resin can be used alone or in combination. In addition, materials other than those described above can be used as long as they can form a relief pattern such as a hologram and have stability.

また、光吸収層24、34は、前記虹彩性多層フィルム11、21、31の光学特性をより強調させるために設ける層である。前記虹彩性多層フィルム11、21、31はその膜厚により特定の波長を吸収させそれ以外の波長を反射させる性質を持っているが、前記吸収波長を光吸収層24、34にて吸収することにより、より鮮明に反射波長のみが見えることになる。この光吸収層24、34は、虹彩性多層フィルム11、21、31によって吸収される光の波長を吸収出来る色で有れば特に限定はなく、一般的には濃色の色を用いるが、黒色が一般的に使用される。   Moreover, the light absorption layers 24 and 34 are layers provided in order to further emphasize the optical characteristics of the iris multilayer films 11, 21, and 31. The iris multilayer films 11, 21, and 31 have a property of absorbing a specific wavelength and reflecting other wavelengths depending on the film thickness, but absorbing the absorption wavelength by the light absorption layers 24 and 34. Thus, only the reflected wavelength can be seen more clearly. The light absorbing layers 24 and 34 are not particularly limited as long as they have a color that can absorb the wavelength of light absorbed by the iris multilayer films 11, 21, and 31, and generally a dark color is used. Black is commonly used.

さらに、光反射層25、35は、光反射性を有する層であれば特に限定されるものではなく、各種金属、合金等の蒸着膜、スパッタリング膜などを用いることができる。例えば、使用される金属としてはAl、Cr、Ni、Cu、Agなどがあり、合金としてはPt・Rh、Ni・Crなどがある。また、上記金属のペーストを用いてスクリーン印刷法もしくはグラビア印刷法にて設けることも可能である。   Further, the light reflecting layers 25 and 35 are not particularly limited as long as they have light reflectivity, and vapor deposition films such as various metals and alloys, sputtering films, and the like can be used. For example, the metals used include Al, Cr, Ni, Cu, and Ag, and the alloys include Pt · Rh and Ni · Cr. Alternatively, the metal paste can be used for screen printing or gravure printing.

この光反射層は、図6に示すように、パターン状に形成されていることより、レリーフ型ホログラムか回折格子に係る微小な凹凸がエンボスがなされた偽造防止媒体3は、虹彩性多層フィルム31がそのままの状態、虹彩性多層フィルムの下層に光吸収層34が設けられた状態および虹彩性多層フィルムの下層に光反射層35が設けられた状態となり、装飾性がより多様になると同時に偽造をより一層困難にしている。   As shown in FIG. 6, since the light reflecting layer is formed in a pattern, the anti-counterfeit medium 3 in which minute irregularities related to a relief hologram or a diffraction grating are embossed is an iris multilayer film 31. As it is, the light absorption layer 34 is provided in the lower layer of the iris multilayer film and the light reflection layer 35 is provided in the lower layer of the iris multilayer film. Making it even more difficult.

また、透明保護層26、36は、ホログラム等エンボス部12、22、32のエンボス部分の汚れもしくは、他の樹脂との溶解によるホログラム等に係る微小な凹凸が破壊するのを防止する目的で設けられるもので、例えばセラミックス薄膜を真空蒸着法もしくはスパッタリング法にて形成する。   Further, the transparent protective layers 26 and 36 are provided for the purpose of preventing destruction of the embossed portions of the embossed portions 12, 22, and 32 such as holograms, or the destruction of minute irregularities related to the holograms caused by dissolution with other resins. For example, a ceramic thin film is formed by vacuum deposition or sputtering.

このセラミック薄膜を構成するセラミックスとしては、Sb23(3.0=屈折率n:以下同じ)、Fe23(2.7)、TiO2(2.6)、CdS(2.6)、CeO2(2.3)、ZnS(2.3)、PbCl2(2.3)、CdO(2.2)、Sb23(2.0)、WO3(2.0)、SiO(2.0)、Si23(2.5)、In23(2.0)
、PbO(2.6)、Ta23(2.4)、ZnO(2.1)、ZrO2(2.0)、MgO(1.6)、SiO2(1.5)、MgF2(1.4)、CeF3(1.6)、CaF2(1.3〜1.4)、AlF3(1.6)、Al23(1.6)、GaO(1.7)などが挙げられ、ホログラム等に係る微小な凹凸がエンボスされたホログラム等エンボス部12、22、32のエンボスを壊さない透明なセラミックであれば特に制限はないが、ホログラム等形成層13、23、33の樹脂と屈折率が異なるセラミックスを使用した方がレリーフ型ホログラムや回折格子の視認性が良くなるため好ましい。
As ceramics constituting this ceramic thin film, Sb 2 O 3 (3.0 = refractive index n: the same applies hereinafter), Fe 2 O 3 (2.7), TiO 2 (2.6), CdS (2.6) ), CeO 2 (2.3), ZnS (2.3), PbCl 2 (2.3), CdO (2.2), Sb 2 O 3 (2.0), WO 3 (2.0), SiO (2.0), Si 2 O 3 (2.5), In 2 O 3 (2.0)
, PbO (2.6), Ta 2 O 3 (2.4), ZnO (2.1), ZrO 2 (2.0), MgO (1.6), SiO 2 (1.5), MgF 2 (1.4), CeF 3 (1.6), CaF 2 (1.3 to 1.4), AlF 3 (1.6), Al 2 O 3 (1.6), GaO (1.7) There is no particular limitation as long as it is a transparent ceramic that does not break the embossing of the embossed portions 12, 22, 32, such as holograms in which minute irregularities related to the holograms are embossed, but the hologram forming layers 13, 23, It is preferable to use ceramics having a refractive index different from that of the resin 33 because the visibility of relief holograms and diffraction gratings is improved.

一方、本発明の偽造防止シール3の一部を構成する粘着層37は、接する光吸収層24、34や、虹彩性多層フィルム11、21、31、光反射層25、35もしくはホログラム形成層13、23、33を変質させたり、冒すものでなければ、一般的な粘着材料を用いて形成することが出来る。例えば塩化ビニル−酢酸ビニル共重合体、ポリエステル系ポリアミド、アクリル系、ブチルゴム系、天然ゴム系、シリコン系、ポリイソブチル系の粘着剤を単独、もしくはアルキルメタクリレート、ビニルエステル、アクリルニトリル、スチレン、ビニルモノマーなどの凝集成分、不飽和カルボン酸、ヒドロキシ基含有モノマー、アクリルニトリルなどに代表される改質成分や重合開始剤、可塑剤、硬化剤、硬化促進剤、酸化防止剤などの添加剤を必要に応じて添加したものを用いることが出来る。粘着層37の形成には公知のグラビア印刷法、オフセット印刷法、スクリーン印刷法などの印刷方法やバーコート法、グラビア法、ロールコート法などの塗布方法などを用いることが出来る。   On the other hand, the pressure-sensitive adhesive layer 37 constituting a part of the anti-counterfeit seal 3 of the present invention includes the light absorbing layers 24 and 34 in contact with each other, the iris multilayer films 11, 21 and 31, the light reflecting layers 25 and 35, or the hologram forming layer 13. , 23, 33 can be formed using a general adhesive material if they are not altered or affected. For example, vinyl chloride-vinyl acetate copolymer, polyester-based polyamide, acrylic-based, butyl rubber-based, natural rubber-based, silicon-based, polyisobutyl-based adhesive alone or alkyl methacrylate, vinyl ester, acrylonitrile, styrene, vinyl monomer Necessary additives such as coagulation components such as unsaturated carboxylic acids, hydroxy group-containing monomers, acryl nitriles, and other reforming components, polymerization initiators, plasticizers, curing agents, curing accelerators, and antioxidants What was added according to it can be used. For the formation of the adhesive layer 37, a known gravure printing method, offset printing method, screen printing method or other printing method, or a bar coating method, gravure method, roll coating method or the like can be used.

このような粘着層は、図2、3そして図5などに示す本発明の偽造防止媒体1、1’、2の虹彩性多層フィルム11、ホログラム等形成層13、光反射層25上に設けることで、それらを偽造防止シールとすることができる。以下、本発明を、具体的な実施例を挙げて詳細に説明する。   Such an adhesive layer is provided on the anti-counterfeit medium 1, 1 ′, 2 of the iris multilayer film 11, the hologram etc. forming layer 13, and the light reflecting layer 25 shown in FIGS. 2, 3 and 5. Thus, they can be used as anti-counterfeit seals. Hereinafter, the present invention will be described in detail with reference to specific examples.

19μm厚の虹彩性多層フィルム上に下記[ホログラム等形成層形成用インキ組成]に係るインキを用いてグラビア印刷法により厚さ0.8μmのホログラム等形成層を塗工・形成した。次に、微小な凹凸のホログラムパターンを有するニッケル製のホログラム画像形成金型を165℃に加熱し、ロールエンボス法により前記ホログラム等形成層の上に押圧することで、その一部に微小な凹凸状のホログラムパターンを形成した。続いてホログラムパターンの上に硫化亜鉛を真空蒸着法にて厚さ80nmで成膜し、透明保護層を設けた。続いて下記[光吸収層形成用インキ組成]に係るインキを用いスクリーン印刷法で厚さ3μmの層をパターン状に塗工して光吸収層を設け、続いて真空蒸着法にてアルミニウムを80nmの厚さで蒸着して光反射層を設け、最後に下記[粘着層形成用粘着剤組成]に係る粘着剤を用いてグラビア法で厚さ10μmの粘着層を設けると共に、離型紙を貼り合わせ、所定の大きさに切り取り偽造防止シールを得た。
[ホログラム等形成層形成用インキ組成]
塩化ビニル・酢酸ビニル共重合体 25部
ウレタン樹脂 10部
メチルエチルケトン 70部
トルエン 30部
[光吸収層形成用インキ組成]
スミインキ 90部
(商品名:SS66 911墨 東洋インキ製造社製)
希釈溶剤(商品名:S695溶剤 東洋インキ製造社製) 10部
[粘着層形成用粘着剤組成]
アクリル系樹脂
(商品名:BPS5160 東洋インキ製造社製) 60部
希釈溶剤(商品名:VC202C溶剤 東洋インキ製造社製) 40部
上記偽造防止シールを商品券等の被帖着物に添付してカラーコピーを行ったところ、真正品(偽造防止シールを添付した被貼着物)ではホログラムが目視でき、さらに所定のパターンが目視角度を違えることにより色が変化して見えるのに対して、複製品(カラー複写物)はホログラムが観察されず、目視確度を違えても色変化が生じないことより、真正品と複製品を容易に区別することが出来た。
On the 19 μm-thick iris multilayer film, a 0.8 μm-thick hologram-forming layer was applied and formed by gravure printing using the ink according to the following “Ink composition for forming a hologram-forming layer”. Next, a holographic image forming mold made of nickel having a fine uneven hologram pattern is heated to 165 ° C. and pressed onto the hologram or the like formation layer by a roll embossing method. A hologram pattern was formed. Subsequently, zinc sulfide was deposited on the hologram pattern with a thickness of 80 nm by a vacuum deposition method, and a transparent protective layer was provided. Subsequently, a layer having a thickness of 3 μm was applied in a pattern by using a screen printing method using an ink according to the following [ink composition for forming a light absorption layer] to provide a light absorption layer, followed by 80 nm of aluminum by vacuum deposition. A light reflective layer is provided by vapor deposition with a thickness of 10 mm, and finally an adhesive layer having a thickness of 10 μm is provided by a gravure method using an adhesive according to the following [Adhesive composition for forming an adhesive layer], and a release paper is bonded. Then, it was cut into a predetermined size to obtain a forgery prevention seal.
[Ink composition for forming hologram and other layers]
Vinyl chloride / vinyl acetate copolymer 25 parts Urethane resin 10 parts Methyl ethyl ketone 70 parts Toluene 30 parts [Ink composition for forming light absorbing layer]
90 parts of Sumiink (trade name: SS66 911 Black, manufactured by Toyo Ink Co., Ltd.)
Diluent solvent (trade name: S695 solvent, manufactured by Toyo Ink Co., Ltd.) 10 parts [adhesive composition for forming an adhesive layer]
Acrylic resin (Brand name: BPS5160, manufactured by Toyo Ink Mfg. Co., Ltd.) 60 parts Diluent solvent (Brand name: VC202C solvent, manufactured by Toyo Ink Mfg. Co., Ltd.) 40 parts Color copy by attaching the anti-counterfeit seal to a substrate such as a gift certificate As a result, the hologram is visible on the genuine product (attachment with an anti-counterfeit sticker), and the color of the predetermined pattern appears to change due to the difference in the viewing angle. In the copy), the hologram was not observed, and no color change occurred even when the visual accuracy was different. Therefore, the genuine product and the duplicate product could be easily distinguished.

本発明の偽造防止媒体の一実施形態を示す平面説明図である。It is a plane explanatory view showing one embodiment of the forgery prevention medium of the present invention. 図1に示す偽造防止媒体のX−X線における断面図である。It is sectional drawing in the XX line of the forgery prevention medium shown in FIG. 本発明の偽造防止媒体における他の実施形態の断面説明図である。It is sectional explanatory drawing of other embodiment in the forgery prevention medium of this invention. 本発明の偽造防止媒体のさらに他の実施形態を示す平面説明図である。It is a plane explanatory view showing further another embodiment of the forgery prevention medium of the present invention. 図4に示す偽造防止媒体のX−X線における断面図である。It is sectional drawing in the XX line of the forgery prevention medium shown in FIG. 本発明の偽造防止シールの一実施形態を示す平面説明図である。It is a plane explanatory view showing one embodiment of a forgery prevention seal of the present invention. 図6に示す偽造防止シールのX−X線における断面図である。It is sectional drawing in the XX line of the forgery prevention seal | sticker shown in FIG.

符号の説明Explanation of symbols

1、1’、2 偽造防止媒体
3 偽造防止シール
11、21、31 虹彩性多層フィルム
12、22、32 ホログラム等エンボス部
13、23、33 ホログラム等形成層
24、34 光吸収層
25、35 光反射層
26、36 透明保護層
37 粘着層
1, 1 ', 2 Anti-counterfeit medium 3 Anti-counterfeit seal 11, 21, 31 Iris multilayer film 12, 22, 32 Embossed portion 13, 23, 33 such as hologram 24, 34 Hologram forming layer 24, 34 Light absorbing layer 25, 35 Light Reflective layer 26, 36 Transparent protective layer 37 Adhesive layer

Claims (6)

二種またはそれ以上の種類の薄膜が交互に積層されてなる虹彩性多層フィルムの少なくとも一部に、レリーフ型ホログラムか回折格子に係る微小な凹凸がエンボスされてなるホログラム等エンボス部が設けられていることを特徴とする偽造防止媒体。   At least a part of the iris multilayer film in which two or more kinds of thin films are alternately laminated is provided with an embossed part such as a relief hologram or a hologram or the like in which minute irregularities relating to a diffraction grating are embossed. An anti-counterfeit medium characterized by 二種またはそれ以上の種類の薄膜が交互に積層されてなる虹彩性多層フィルム上にホログラム等形成層が設けられており、該ホログラム等形成層の少なくとも一部に、レリーフ型ホログラムか回折格子に係る微小な凹凸がエンボスされてなるホログラム等エンボス部が設けられていることを特徴とする偽造防止媒体。   A hologram etc. forming layer is provided on an iris multi-layer film in which two or more kinds of thin films are alternately laminated, and a relief hologram or diffraction grating is formed on at least a part of the hologram etc. forming layer. An anti-counterfeit medium comprising an embossed portion such as a hologram formed by embossing such minute irregularities. 前記ホログラム等エンボス部上に透明保護層が設けられ、該透明保護層上の一部または全部に光吸収層が設けられていることを特徴とする、請求項1または2に記載の偽造防止媒体。   The anti-counterfeit medium according to claim 1, wherein a transparent protective layer is provided on the embossed portion such as the hologram, and a light absorbing layer is provided on a part or all of the transparent protective layer. . 前記ホログラム等エンボス部上の一部に、パターン状の光吸収層が設けられ、さらにその上層に光反射層が設けられていることを特徴とする、請求項1乃至3のいずれかに記載の偽造防止媒体。   The pattern light absorption layer is provided in a part on the embossed part such as the hologram, and the light reflection layer is further provided thereon. Anti-counterfeit medium. 前記光反射層は、前記ホログラム等エンボス部の前記微小な凹凸の形成領域に部分的に設けられていることを特徴とする、請求項4記載の偽造防止媒体。   The anti-counterfeit medium according to claim 4, wherein the light reflection layer is partially provided in a formation region of the minute unevenness of the embossed portion such as the hologram. 請求項1乃至5のいずれかに記載の偽造防止媒体にさら粘着層が設けられていることを特徴とする偽造防止シール。   An anti-counterfeit seal, wherein the anti-counterfeit medium according to any one of claims 1 to 5 is further provided with an adhesive layer.
JP2003318211A 2003-09-10 2003-09-10 Anti-counterfeit media and anti-counterfeit seal Expired - Fee Related JP4487521B2 (en)

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