JP7006014B2 - 偽造防止構造体 - Google Patents
偽造防止構造体 Download PDFInfo
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- JP7006014B2 JP7006014B2 JP2017160323A JP2017160323A JP7006014B2 JP 7006014 B2 JP7006014 B2 JP 7006014B2 JP 2017160323 A JP2017160323 A JP 2017160323A JP 2017160323 A JP2017160323 A JP 2017160323A JP 7006014 B2 JP7006014 B2 JP 7006014B2
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Images
Landscapes
- Credit Cards Or The Like (AREA)
- Optical Filters (AREA)
- Polarising Elements (AREA)
- Laminated Bodies (AREA)
Description
偽造防止構造体1を構成する発色層5は、ポリカーボネート材料にレーザー波長光を吸収するエネルギー吸収体や感熱性色変化材料が添加されたものが使用可能である。例えば、SABIC社のLEXANシリーズSD8B94ポリカーボネートシートなどが挙げられる。
印刷部4は、伝えるべき情報や意匠を付与する為に、任意の色彩やパターン、文字や記号、絵柄などによって、全面または部分的に設けられる層である。
セキュリティデバイス3は、光学機能層7と、貼り換え防止層9とを積層して構成する。セキュリティデバイス3は、既知の印刷方式にて発色層5に積層して備えることができ、転写箔として支持体にセキュリティデバイス3を予め準備しておき、熱圧等で発色層5上に積層してもよい。
光学機能層7は、セキュリティデバイス3に含まれる。光学機能層7としては、コレステリック液晶や回折構造を用いることができる。コレステリック液晶は分子軸に垂直な方向に螺旋周期構造を持ち、その螺旋構造のピッチが光と相互関係を構築している。その結果、コレステリック液晶は螺旋ピッチに対応した波長の光を選択的に反射する。
回折構造8の形成面に光学効果を高めるために反射層を設けてもよい。セキュリティデバイス3越しにレーザー発色領域2を観察するため、反射層は透明であることが好ましい。材料としては例えばZnS、TiO2などが挙げられる。反射層は、単層でも多層でも良い。単層の場合は、単層の蒸着により反射層を形成でき、多層の場合は、複数の蒸着膜を順次形成できる多層蒸着により形成できる。
貼り換え防止層9は、レーザー発色性や蛍光発色性と、接着性を有するため、それぞれの機能を発揮する材料を適宜使用するとよい。
レーザー発色させる方法として、例えば1)樹脂を発泡させて発色する方法、2)樹脂にレーザー光を吸収する添加剤を加えて添加剤自体を発色させる方法、および3)樹脂にレーザー光を吸収する添加剤を加えて添加剤を発熱させ周囲の樹脂を炭化させて発色する方法などが知られている。用途に応じて、適切な方法を選択してよい。
蛍光発光性を付与する材料として、次のものが使用できる。紫外線用蛍光体としては、例えば、Ca2B5O3Cl:Eu2 +、CaWO4、ZnO:Zn2SiO4:Mn、Y2O2S:Eu、ZnS:Ag、YVO4:Eu、Y303:Eu、Gd2O2S:Tb、La2O2S:Tb、Y3Al5O12:Ce等が挙げられる。蛍光発光性を付与する材料としては、無機顔料も用いることができる。無機顔料の中でも、特に結晶性のものを用いることができる。
接着性を付与する材料としては、一般的な粘着材料を用いて形成することができる。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できる。
Claims (4)
- レーザー発色部を有する発色層の少なくとも片面側の一部もしくは全面に、セキュリティデバイスが配置され、前記セキュリティデバイスの前記発色層側とは反対側に、透明保護シートが配置された偽造防止構造体であって、
前記セキュリティデバイスは、光学機能層と、貼り換え防止層とを積層して構成し、
前記貼り換え防止層は、接着性およびレーザー変質性を備え、
前記レーザー発色部が、前記透明保護シート側から、前記透明保護シートおよび前記セキュリティデバイス越しに観察され、
前記貼り換え防止層はさらに、前記レーザー発色部と対になる貼り替え検知柄記録部を備え、
前記貼り換え検知柄記録部が、前記透明保護シート側から、前記透明保護シートおよび前記セキュリティデバイス越しに観察されることを特徴とする偽造防止構造体。 - 前記光学機能層が、垂直に入射した赤外光を反射するコレステリック液晶であることを特徴とする請求項1に記載の偽造防止構造体。
- 前記貼り換え防止層が蛍光発光性を有することを特徴とする請求項1に記載の偽造防止構造体。
- カードまたはパスポートにおける個別情報の記録のために適用されたことを特徴とする請求項1乃至3のうち何れか1項に記載の偽造防止構造体。
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PCT/JP2018/031046 WO2019039524A1 (ja) | 2017-08-23 | 2018-08-22 | 積層体、身分証明、および、身分証明の検証方法 |
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