JP5674471B2 - 回折表面構造を有するセキュリティ文書 - Google Patents
回折表面構造を有するセキュリティ文書 Download PDFInfo
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Description
定義
セキュリティ素子は、少なくとも1つのセキュリティ特徴を含む構造ユニットである。セキュリティ素子は、有価証券でもあり得るセキュリティ文書と結合し、例えば接着することができる独立した構造ユニットであることができる。さらに、セキュリティ素子は、セキュリティ文書の一体化された構成要素であることもできる。前者の例は、セキュリティ文書に接着可能なビザである。後者の例は、証明書にエンボス加工された回折表面レリーフである。
Λ=λ/2n sinθであり、
λは波長であり、nは材料の屈折率であり、両方のコヒーレント光ビームが角度2θで交互に当たる。両方のコヒーレント光ビームの強度が理想的に同じである場合、干渉パターンの光度は周期的にゼロに戻る。ホログラフィック構造のみが表面レリーフとして回折層2の表面に設けられる場合、通常、いわゆる光学的に薄いホログラムが得られる。これは、ホログラムにおいて、通常、ホログラフィック構造により発生されている光の波長に対応する再生波長の選択性、およびホログラムの製造時の形状によって固定されている、再生のための照射角度の選択性がそれぞれ低くなっていることを意味する。記録されたホログラフィック構造が体積領域を介して延び、これにより、いわゆるブラッグ条件を正確に満たす必要があり、高い角度選択性も、高い波長選択性も与えられている光学的に厚いホログラムとは対照的に、光学的に薄い回折表面構造の場合、回折効率を低下させることなく、異なる波長および異なる照射角度の光によって、記憶された情報の再生を行うことができる。
2 回折層
3 別の層
4 回折表面構造
5 (入射した)再生光
6 上面
7 (直接)反射回折された再生光
8 スクリーン
9 透過した再生光(中性線に接続された回折パターン)
10 透過した再生光(+/−の第1の回折パターン)
11 別のスクリーン
12 情報
13 拡散散乱された再生光
21 透明なチャネル
22 広がり(a)
23 距離(d)
24 面法線
25 反対面
31 反射素子
41 吸収素子
61 体積ホログラム
Claims (7)
- 少なくとも1つのセキュリティ素子を有するセキュリティ文書(1)であって、
前記セキュリティ文書(1)が、少なくとも1つの回折層(2)を含む文書体を含み、前記少なくとも1つの回折層(2)が上面に、光学的に薄い投影ホログラムとして形成されている回折表面構造(4)を前記少なくとも1つのセキュリティ素子として含むセキュリティ文書(1)において、
前記回折表面構造(4)を読み取るために前記回折層(2)の前記上面(6)に当たって、前記回折表面構造(4)を透過した再生光(9、10)の、前記回折層(2)の前記上面(6)を介して戻る全方向の反射を最小限にするために、前記文書体において、前記少なくとも1つの回折層(2)の前記上面(6)から見て前記回折表面構造(4)の後方に、少なくとも1つのノイズ抑制構造体が形成または配置されていること、前記文書体が、前記回折層(2)と少なくとも1つの別の層(3’)を含む複数層から製造されており、かつ、前記ノイズ抑制構造体が、透明なチャネル(21)を含み、当該透明なチャネル(21)が、少なくとも部分的に不透明である前記少なくとも1つの別の層(3’)の全てを通過していることによって、当該透明なチャネル(21)が、前記少なくとも一つの別の層(3’)内に形成されているので、当該透明なチャネルが、前記回折表面構造(4)を透過した前記再生光(9、10)の少なくとも一部を、前記文書体の前記少なくとも1つの回折層の前記上面(6)の反対面から出すことを可能にすることを特徴とするセキュリティ文書(1)。 - 前記ノイズ抑制構造体が反射素子(31)を含み、前記反射素子(31)が、前記回折表面構造(4)を透過した前記再生光(9、10)の少なくとも一部の指向性反射を支持すること、前記回折表面構造(4)を透過した前記再生光が、前記回折表面構造(4)の境界面で反射回折された再生光(7)と重なり合うような方法で、前記反射素子(31)で反射されるように、前記反射素子(31)が配置および形成されていることを特徴とする請求項1に記載のセキュリティ文書(1)。
- 前記ノイズ抑制構造体が反射素子(31)を含み、前記反射素子(31)が、前記回折表面構造(4)を透過した前記再生光(9、10)の少なくとも一部の指向性反射を支持すること、前記反射素子(31)が、光学可変色素で覆われた部分を含み、少なくとも1つのスペクトル色素の反射が、幾何学的な光学系に従って反射角度からの偏差角度だけずれる観察角度において、最大強度を有することを特徴とする請求項1に記載のセキュリティ文書(1)。
- 読み取りのために、再生光(5)の際立った入射角度が存在するように、前記回折表面構造(4)が形成されており、その結果、前記際立った角度で前記回折表面構造(4)に当たった前記再生光(5)が、読み取りのために、前記偏差角度で前記光学可変色素に当たり、前記回折層(2)の前記上面(6)を介して垂直に戻るように反射されることを特徴とする請求項3に記載のセキュリティ文書(1)。
- 前記ノイズ抑制構造体が光学的体積ホログラム(61)を含み、前記光学的体積ホログラム(61)が、前記透過した再生光(9、10)の少なくとも1つの回折パターンを回折または反射回折することを特徴とする請求項1〜4のいずれか一項に記載のセキュリティ文書(1)。
- 前記体積ホログラム(61)に、少なくとも1つのパターンが符号化されていること、前記体積ホログラム(61)に符号化された前記パターンが全パターンのパターン構成要素であり、前記回折表面構造(4)の境界面における反射が前記全パターンの別のパターン構成要素を再生し、前記回折表面構造(4)に当たった前記再生光(5)の別の際立った入射角度が存在し、その結果、前記少なくとも1つのパターン構成要素が再生され、前記全パターンに対して前記別のパターン構成要素を補足するように、前記別の際立った入射角度で前記回折表面構造(4)に当たって、前記回折表面構造(4)を透過した前記再生光(9、10)の少なくとも1つの回折パターンが、前記体積ホログラム(61)を再生することを特徴とする請求項5に記載のセキュリティ文書(1)。
- 前記回折表面構造(4)を透過した前記再生光(9、10)の、少なくとも1つの回折パターンが、前記回折層(2)の前記上面(6)を介して反射されて戻るように回折すべく、前記体積ホログラム(61)が形成されていることを特徴とする請求項5または6に記載のセキュリティ文書(1)。
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DE102007052950A DE102007052950B3 (de) | 2007-10-31 | 2007-10-31 | Sicherheitsdokument mit beugender Oberflächenstruktur und Verfahren zu dessen Herstellung |
DE102007052950.5 | 2007-10-31 | ||
PCT/EP2008/009349 WO2009056359A2 (de) | 2007-10-31 | 2008-10-31 | Sicherheitsdokument mit beugender oberflächenstruktur und verfahren zu dessen herstellung |
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DE102010015302A1 (de) * | 2010-04-14 | 2011-10-20 | Bundesdruckerei Gmbh | Selbstverifizierendes optisches Sicherheitselement |
DE102015010811A1 (de) * | 2015-08-21 | 2017-02-23 | Veridos Gmbh | Mehrschichtiger Datenträger mit flächigem Durchsichtsfenster |
WO2017179685A1 (ja) * | 2016-04-14 | 2017-10-19 | 凸版印刷株式会社 | 積層体、個人認証媒体、および、積層体の製造方法 |
GB2563187B (en) * | 2017-02-03 | 2020-07-22 | De La Rue Int Ltd | Method of forming a security sheet substrate |
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KR100837593B1 (ko) * | 2000-01-21 | 2008-06-13 | 플렉스 프로덕츠, 인코포레이티드 | 가변적 광학 특성의 보안 장치 |
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DE102004053367A1 (de) * | 2004-04-27 | 2005-11-17 | Bundesdruckerei Gmbh | Sicherheitselement, Wertdokument und Verfahren zur Herstellung eines Sicherheitselements |
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JP2007003760A (ja) * | 2005-06-23 | 2007-01-11 | Toppan Printing Co Ltd | 偽造防止媒体及び偽造防止シール |
US20070013983A1 (en) * | 2005-07-04 | 2007-01-18 | Dai Nippon Printing Co., Ltd. | Holographic viewing device, and holographic viewing card incorporating it |
DE102007019522A1 (de) * | 2007-04-25 | 2008-10-30 | Giesecke & Devrient Gmbh | Durchsichtssicherheitselement |
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EP2208115A2 (de) | 2010-07-21 |
WO2009056359A3 (de) | 2009-06-25 |
DE102007052950B3 (de) | 2009-05-07 |
EP2208115B1 (de) | 2019-06-26 |
JP2011502063A (ja) | 2011-01-20 |
WO2009056359A2 (de) | 2009-05-07 |
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