JP4910421B2 - Information recording medium having diffraction grating and information authentication apparatus for the information recording medium - Google Patents
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- 238000005286 illumination Methods 0.000 claims description 20
- 239000000758 substrate Substances 0.000 claims description 16
- 238000000149 argon plasma sintering Methods 0.000 claims description 12
- 238000003384 imaging method Methods 0.000 claims description 3
- 239000011888 foil Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 3
- 238000000059 patterning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000010894 electron beam technology Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
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Description
本発明は、表面に光散乱要素を有する微小な回折格子要素の複数個が二次元平面に配置されている回折格子を有する情報記録媒体、特に微小な回折格子要素を配した基板面の平滑性が悪い場合でも、内在している秘匿情報の認証が確実にでき、その真贋判定を行えるようになっていると共に、微小な回折格子要素を配した領域を目視判別することが困難であり、より一層高度な偽造防止効果を発現し、デザインの自由度の増加ならびに可視性の向上を実現することができるようにした、回折格子を有する情報記録媒体と、この情報記録媒体に隠蔽されている秘匿情報を認証し、その真贋判定を確実に行えるようにした情報記録媒体と情報記録媒体の情報認証装置に関する。 The present invention relates to an information recording medium having a diffraction grating in which a plurality of minute diffraction grating elements having light scattering elements on the surface are arranged in a two-dimensional plane, and particularly to the smoothness of the substrate surface on which the minute diffraction grating elements are arranged. Even if it is bad, it is possible to reliably authenticate the secret information that is inherent, it is possible to determine its authenticity, and it is difficult to visually determine the area where the minute diffraction grating element is arranged, and more An information recording medium having a diffraction grating that expresses a higher level of anti-counterfeiting effect and can realize an increase in design freedom and visibility, and a concealment hidden in the information recording medium The present invention relates to an information recording medium which authenticates information and can reliably determine its authenticity, and an information authentication apparatus for the information recording medium.
従来から、平面状の基板上に、表面に回折格子を有する微小な回折格子要素（ドット）を画素として複数個配置することにより得られる回折格子パターンを有する、ディスプレイなどの情報記録媒体が多く使用されてきている。 Conventionally, an information recording medium such as a display having a diffraction grating pattern obtained by arranging a plurality of minute diffraction grating elements (dots) having a diffraction grating on a surface on a flat substrate has been used. Has been.
この内、２光束干渉による回折格子パターンを有する情報記録媒体は、２光束干渉による微小な干渉縞（以下、回折格子と称す）を、そのピッチ、方向、および光強度を変化させて感光性フィルムに次々と露光して得られるものである（例えば、特許文献１参照）。より具体的には、この回折格子パターンは、複数の微小な回折格子要素に分割されていると共に、各回折格子要素の回折格子におけるピッチ、空間周波数、さらには各回折格子要素の並べ方を適宜変化させ、さらに回折格子要素表面の回折格子の方向を各回折格子要素毎に変化させてなるものである。 Among these, an information recording medium having a diffraction grating pattern by two-beam interference is a photosensitive film in which minute interference fringes (hereinafter referred to as diffraction grating) by two-beam interference are changed in pitch, direction, and light intensity. Are obtained by successive exposures (see, for example, Patent Document 1). More specifically, the diffraction grating pattern is divided into a plurality of minute diffraction grating elements, and the pitch and spatial frequency of each diffraction grating element and the arrangement of the diffraction grating elements are appropriately changed. Further, the direction of the diffraction grating on the surface of the diffraction grating element is changed for each diffraction grating element.
さらに、回折格子パターンを有する情報記録媒体としては、例えば電子ビーム露光装置を用い、コンピュータ制御により、平面状の基板が載置されたＸＹステージを移動させ、基板の表面に微小な回折格子要素の複数個を絵柄状に記録・配置することにより得られる、所定絵柄の回折格子パターンが形成された情報記録媒体も提案されている（例えば、特許文献２参照）。 Furthermore, as an information recording medium having a diffraction grating pattern, for example, an electron beam exposure apparatus is used, and an XY stage on which a planar substrate is placed is moved by computer control, and a minute diffraction grating element is formed on the surface of the substrate. There has also been proposed an information recording medium on which a diffraction grating pattern having a predetermined pattern formed by recording and arranging a plurality of patterns in a pattern (see, for example, Patent Document 2).
ところで、このような回折格子を有する情報記録媒体の真贋を、検証機で判定する方法としては、例えば、微小回折格子要素（ドット）の配列中に記録してあるパターン情報部分へレーザー光等を照射して回折光を得、それをセンサーで読み取り、記録し、それに基づき真贋判定を行う方法が採用されている（例えば、特許文献３参照）。 By the way, as a method for determining the authenticity of an information recording medium having such a diffraction grating by a verification machine, for example, laser light or the like is applied to a pattern information portion recorded in an array of minute diffraction grating elements (dots). A method has been adopted in which diffracted light is obtained by irradiation, which is read and recorded by a sensor, and authenticity is determined based on that (for example, see Patent Document 3).
また、肉眼では観察できないパターン、もしくは識別できないパターンとして情報を記録しておき、レーザー光を用いた読み取り装置などを用いてその情報を読み取って真贋判定を行う方法も提案されている。 In addition, a method has been proposed in which information is recorded as a pattern that cannot be observed with the naked eye or a pattern that cannot be identified, and the authenticity is determined by reading the information using a reader using a laser beam.
しかしながら、このような方法で真贋判定を行う場合、判定対象となる情報記録媒体の回折格子パターンが転写箔を利用した転写によって紙上に形成されたような場合には、転写する紙の平坦性が悪いため、転写箔が紙表面の凹凸に沿って曲げられるため、転写箔における回折格子の凹凸状態やパターンが忠実に紙上に転写・再現されず、延いては、判定時に正しい再生像を得ることができなくなってしまい、情報を明確に読み取ることが困難となっていた。 However, when authenticity determination is performed by such a method, when the diffraction grating pattern of the information recording medium to be determined is formed on the paper by transfer using a transfer foil, the flatness of the paper to be transferred is low. Since the transfer foil is bent along the irregularities on the paper surface, the irregularities and patterns of the diffraction grating on the transfer foil are not faithfully transferred / reproduced on the paper. It became difficult to read the information clearly.
さらに、このような転写によって得られる回折格子を有する情報記録媒体は、特定の領域に情報を記録していることから、拡大鏡などの観察装置で容易に情報を記録している領
域を発見することができ、レーザー光を照射する角度さえ解ってしまえば、その情報を基に模造品を作製することも可能となってしまう。
Furthermore, since an information recording medium having a diffraction grating obtained by such transfer records information in a specific area, an area where information is easily recorded can be found with an observation device such as a magnifying glass. If the angle at which the laser beam is irradiated is known, it becomes possible to produce a counterfeit product based on the information.
このような問題を解決するために、目視による認識が不能な大きさに形成され、回折構造の単位画像によって構成されている、認証コードを記録し、レーザー光を用いた読取装置などを用いてその情報を読み取って真贋判定を行う方法が提案されている。（特許文献４参照）
しかしながら、このような方法で真贋の判定を行う場合、判定対象となる情報記録媒体の回折格子パターンが転写箔を利用した転写によって紙上に形成されたような場合には、転写する紙の平坦性が悪いため、転写箔が紙表面の凹凸に沿って曲げられるため、転写箔における回折格子の凹凸状態やパターンが忠実に紙上に転写・再現されず、延いては判定時に正しい再生像を得ることが出来なくなってしまい、情報を明確に読み取ることが困難となってしまう。
However, when authenticity is determined by such a method, if the diffraction grating pattern of the information recording medium to be determined is formed on the paper by transfer using a transfer foil, the flatness of the paper to be transferred Since the transfer foil is bent along the unevenness of the paper surface, the uneven state and pattern of the diffraction grating on the transfer foil are not faithfully transferred / reproduced on the paper, so that a correct reproduced image can be obtained at the time of judgment. It becomes difficult to read the information clearly.
本発明は、上記の問題点に鑑みなされたもので、表面に光散乱要素を有する微小な回折格子要素を配した基板の表面平滑性が悪い場合でも、確実に真贋判定を行うことが可能であると共に、所定の秘匿情報を記録した領域を判別することが困難であり、より一層高度な偽造防止効果を発現し、デザインの自由度の増加ならびに可視性の向上を実現することができる回折格子を有する情報記録媒体及び情報記録媒体の情報認証装置を提供することを目的とする。 The present invention has been made in view of the above problems, and even when the surface smoothness of a substrate on which a minute diffraction grating element having a light scattering element is arranged is poor, it is possible to reliably perform authenticity determination. In addition, it is difficult to discriminate the area where the predetermined confidential information is recorded, and it is possible to realize a higher level of anti-counterfeiting effect, and to realize an increase in design freedom and an improvement in visibility. It is an object to provide an information recording medium having information and an information authentication apparatus for the information recording medium.
以上の目的を達成するために、請求項１に記載の発明は、表面に光散乱要素を有する微小な回折格子要素の複数個が基板表面に配置されており、これら複数個の回折格子要素は秘匿情報の全部又は一部を保持しており、光源からの照明光の照射に基づく散乱光及び回折光の全部又は一部が空間上の所定領域に入射するように矩形形状、格子間隔及び格子角度が設定されていると共に、少なくとも２個以上の回折格子要素の組み合わせからなる回折格子要素群からの光散乱及び回折光の全部又は一部が入射する所定領域における再生情報和により、所定の秘匿情報がパターン化されるようになっていることを特徴とする回折格子を有する情報記録媒体である。 In order to achieve the above object, according to the first aspect of the present invention, a plurality of minute diffraction grating elements having light scattering elements on the surface are arranged on the surface of the substrate. Holds all or part of the confidential information, and has a rectangular shape, lattice spacing, and lattice so that all or part of the scattered light and diffracted light based on the illumination light from the light source is incident on a predetermined area in space. A predetermined concealment is established by light scattering from a diffraction grating element group composed of a combination of at least two or more diffraction grating elements and a reproduction information sum in a predetermined region where all or part of the diffracted light is incident while an angle is set. An information recording medium having a diffraction grating characterized in that information is patterned.
また、請求項２に記載の発明は、表面に光散乱要素を有する微小な回折格子要素の複数個が基板表面に配置されており、これら複数個の回折格子要素は秘匿情報の全部又は一部を保持しており、光源からの照明光の照射に基づく散乱光及び回折光が空間上の所定領域に入射するように矩形形状、格子間隔及び格子角度が設定されていると共に、少なくとも２個以上の回折格子要素の組み合わせからなる回折格子要素群を含んでおり、回折格子要素群からの散乱光及び回折光が入射する所定領域における再生情報和により、所定の秘匿情報がパターン化されるようになっていることを特徴とする回折格子を有する情報記録媒体の真贋を判定するための装置であって、光源と、この光源から回折格子要素への照明光に基づく散乱光及び回折光が入射する所定領域内でのこれら散乱光及び回折光の組み合わせによってパターン化される秘匿情報を読み取るための読み取り手段と、この読み取り手段からの情報に基づいて真贋判定を行う判定手段とを少なくとも具備していることを特徴とする情報記録媒体の情報認証装置である。 In the invention according to claim 2, a plurality of minute diffraction grating elements having light scattering elements on the surface are arranged on the substrate surface, and the plurality of diffraction grating elements are all or a part of the confidential information. The rectangular shape, lattice spacing, and lattice angle are set so that scattered light and diffracted light based on illumination light irradiation from the light source enter a predetermined region in space, and at least two or more A plurality of diffraction grating element groups, and the predetermined secret information is patterned by the sum of reproduction information in a predetermined region where the scattered light and the diffracted light from the diffraction grating element group are incident. An apparatus for determining the authenticity of an information recording medium having a diffraction grating, characterized in that a light source, and scattered light and diffracted light based on illumination light from the light source to the diffraction grating element enter. A reading means for reading confidential information patterned by a combination of the scattered light and the diffracted light within a predetermined area, and a determination means for performing authenticity determination based on information from the reading means An information authentication apparatus for an information recording medium characterized in that:
また、請求項３に記載の発明は、請求項２記載の情報記録媒体の情報認証装置において、前記光源からの照明光が回折格子要素に照射され、散乱及び回折された後に散乱光及び回折光が入射する所定領域の近傍に回折像を結像するための投影スクリーンが配置されていると共に、この投影スクリーンに結像された散乱像及び回折像を情報読み取り手段が読み取って電気信号に変換するようになっていることを特徴とする。
さらにまた、請求項４に記載の発明は、請求項２記載の情報記録媒体の情報認証装置において、前記光源からの照明光が回折格子要素に照射され、散乱及び回折された後に入射する所定領域の近傍に情報読み取り手段の撮像レンズの焦点位置が合致するように設定されていることを特徴とする。
According to a third aspect of the present invention, in the information authentication apparatus for an information recording medium according to the second aspect, the illumination light from the light source is irradiated on the diffraction grating element, and after being scattered and diffracted, the scattered light and the diffracted light. A projection screen for forming a diffracted image is disposed in the vicinity of a predetermined region where the light enters, and the information reading means reads the scattered image and the diffracted image formed on the projection screen and converts them into an electrical signal. It is characterized by that.
Furthermore, the invention according to claim 4 is the information authentication apparatus for the information recording medium according to claim 2, wherein the illumination light from the light source is applied to the diffraction grating element, and is incident after being scattered and diffracted. Is set so that the focal position of the imaging lens of the information reading means matches.
また、請求項５に記載の発明は、請求項２〜４のいずれかに記載の情報記録媒体の情報認証装置において、前記光源が、冷陰極管もしくは発光ダイオードと、反射板と、導光板とを組み合わせてなる平面光源であり、その前面に特定形状部分を遮光する遮光手段が設けられていることを特徴とする。 The invention according to claim 5 is the information authentication apparatus for the information recording medium according to any one of claims 2 to 4, wherein the light source is a cold cathode tube or a light emitting diode, a reflector, and a light guide plate. The light source is characterized in that a light shielding means for shielding a specific shape portion is provided on the front surface thereof.
本発明の回折格子を有する情報記録媒体は、微小な回折格子要素を配した基板面の平滑性が悪い場合でも、確実に真贋判定を行うことが可能であると共に、微小な回折格子要素を配置した領域を判別することが困難であり、より一層高度な偽造防止効果を発現し、デザインの自由度の増加ならびに可視性の向上を実現することができる。 The information recording medium having the diffraction grating of the present invention can reliably determine the authenticity even if the smoothness of the substrate surface on which the fine diffraction grating elements are arranged is low, and the fine diffraction grating elements are arranged. It is difficult to discriminate the region, and a more advanced anti-counterfeit effect can be realized, and an increase in design freedom and an improvement in visibility can be realized.
また、本発明の情報記録媒体の情報認証装置は、所定の光源で照明することで、真贋判定を行おうとする情報記録媒体の回折格子要素配置面における凹凸の影響を少なくすることができ、内在する秘匿情報の認識と判定を確実に行うことが可能である。 In addition, the information authentication apparatus for the information recording medium of the present invention can reduce the influence of unevenness on the diffraction grating element arrangement surface of the information recording medium on which authentication is to be performed by illuminating with a predetermined light source. It is possible to reliably recognize and determine confidential information to be performed.
以下、本発明の一実施例としての実施形態について図面を参照して説明する。図１は、本発明の回折格子を有する情報記録媒体の構成と、この回折格子を有する情報記録媒体の真贋を判定するための、情報記録媒体の情報認証装置の概略の構成を示す説明図である。 Hereinafter, an embodiment as an example of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of an information recording medium having a diffraction grating of the present invention and the schematic configuration of an information authentication apparatus for an information recording medium for determining the authenticity of an information recording medium having this diffraction grating. is there.
回折格子を有する情報記録媒体は、表面に光散乱要素を有する微小な回折格子要素の複数個が基板表面に配置されており、これら複数個の回折格子要素は秘匿情報の全部又は一部を保持しており、所定の光源からの照明光が照射されたときの散乱光及び回折光が、空間上の所定領域に入射するように矩形形状及び格子間隔および格子角度が設定されていると共に、少なくとも２個以上の回折格子要素の組み合わせからなる回折格子要素群を含んでおり、回折格子要素群からの散乱光及び回折光が入射する所定領域における再生情報和により所定の秘匿情報がパターン化されるようになっている。 In an information recording medium having a diffraction grating, a plurality of minute diffraction grating elements having light scattering elements on the surface are arranged on the surface of the substrate, and the plurality of diffraction grating elements hold all or part of confidential information. The rectangular shape and the lattice interval and the lattice angle are set so that the scattered light and the diffracted light when irradiated with the illumination light from the predetermined light source are incident on the predetermined region in the space, and at least It includes a diffraction grating element group composed of a combination of two or more diffraction grating elements, and predetermined secret information is patterned by the sum of reproduction information in a predetermined region where scattered light and diffracted light from the diffraction grating element group are incident. It is like that.
より具体的には、この回折格子を有する情報記録媒体は、表面に光散乱要素を有する微小な回折格子要素の複数個（１ａ、１ｂ、１ｃ、１ｄ）が基板の表面に配置されており、回折格子要素１ａ、１ｂ、１ｃ、１ｄで一つの回折格子要素群１を構成している。
More specifically, in the information recording medium having this diffraction grating, a plurality of fine diffraction grating elements (1a, 1b, 1c, 1d) having light scattering elements on the surface are arranged on the surface of the substrate, The diffraction grating elements 1a, 1b, 1c, and 1d constitute one diffraction
一つの回折格子要素群１の回折格子要素１ａ、１ｂ、１ｃ、１ｄは、所定の面積を持つ光源からの照明光が照射された時の散乱光及び回折光が空間上の所定領域に入射するように、それらの矩形形状及び格子間隔及び格子角度がそれぞれ設定されている。そして、回折格子を有する情報記録媒体は、これらの少なくとも２個以上の回折格子要素の組み合わせになる回折格子要素群を含むと共に、回折格子要素群に対応する空間上の所定領域における再生情報和により所定の秘匿情報がパターン化されるようになっている。
In the diffraction grating elements 1a, 1b, 1c, and 1d of one diffraction
一方、情報記録媒体の情報認証装置は、上記した構成の回折格子を有する情報記録媒体
の真贋を認証するための装置であって、所定の光源と、この光源から本発明の回折格子を有する情報記録媒体上の回折格子要素１ａ、１ｂ、１ｃ、１ｄへ照明光を照射することによってのみパターン化される秘匿情報を読み取るための情報読み取り手段と、この情報読み取り手段からの情報に基づいて真贋判定を行う判定手段を少なくとも具備してなるものである。
On the other hand, an information authentication apparatus for an information recording medium is an apparatus for authenticating the authenticity of an information recording medium having a diffraction grating having the above-described configuration, and includes a predetermined light source and information having the diffraction grating of the present invention from this light source. Information reading means for reading confidential information that is patterned only by irradiating illumination light to the diffraction grating elements 1a, 1b, 1c, and 1d on the recording medium, and authenticity determination based on information from the information reading means It comprises at least determination means for performing the above.
図１において、平面状の光源からの照明光は、各回折格子要素１ａ、１ｂ、１ｃ、１ｄで設定された回折角度で回折及び散乱し、空間上の所定領域に入射し、投影スクリーン上に回折像（回折光の再生情報）が投影される。この時、回折格子要素１ａ、１ｂ、１ｃ及び１ｄで散乱及び回折した光がこの領域に入射するように光散乱要素の矩形形状、ならびに回折格子要素の格子間隔および格子角度を設定してある。 In FIG. 1, illumination light from a planar light source is diffracted and scattered at diffraction angles set by the diffraction grating elements 1a, 1b, 1c, and 1d, is incident on a predetermined region in space, and is projected onto the projection screen. A diffraction image (reproduction information of diffracted light) is projected. At this time, the rectangular shape of the light scattering element and the grating interval and grating angle of the diffraction grating element are set so that the light scattered and diffracted by the diffraction grating elements 1a, 1b, 1c and 1d is incident on this region.
また、この回折格子を有する情報記録媒体の回折格子要素１ａ、１ｂ、１ｃ及び１ｄ以外の回折格子要素はこの領域には入射しないように設定してある。このため、回折格子を有する情報記録媒体に所定の光源より照明光を照明することで、上記各回折格子要素からの散乱光及び回折光が所定領域にそれぞれ入射し、投影スクリーン上に投影され、それらの組み合わせにより所定の秘匿情報がパターン化される。
本発明の回折格子を有する情報記録媒体においては、上述したように、所定領域のような、同一の領域を複数個配置されるようにし、これらの同一の領域の組み合わせにより所定の秘匿情報がパターン化（現出）するようになっていて、情報読み取り手段によりその存在が認識できるようになる。図１に示す例では、投影スクリーン上に秘匿情報が投影できるようになっており、この投影パターンを確認することにより、真贋判定を行うことができる。
Further, diffraction grating elements other than the diffraction grating elements 1a, 1b, 1c and 1d of the information recording medium having this diffraction grating are set so as not to enter this region. For this reason, by illuminating the information recording medium having a diffraction grating with illumination light from a predetermined light source, scattered light and diffracted light from each of the diffraction grating elements are incident on a predetermined area and projected onto a projection screen, Predetermined secret information is patterned by the combination thereof.
In the information recording medium having the diffraction grating of the present invention, as described above, a plurality of identical areas such as predetermined areas are arranged, and predetermined confidential information is patterned by a combination of these identical areas. The information can be recognized by the information reading means. In the example shown in FIG. 1, confidential information can be projected on a projection screen, and authenticity can be determined by confirming this projection pattern.
このような真贋判定を行う場合、情報記録媒体上の回折格子要素が転写箔を利用した転写によって紙上に形成されたような場合には、転写箔上での回折格子要素の凹凸が紙表面の凹凸形状に沿った表面形状となってしまい、それを構成する回折格子要素からの散乱光及び回折光が当初計算された角度では射出されず、レーザー光などの面積の小さいビーム光を入射した場合には、広がりを持った回折光となってしまい、また、射出角度の変動が大きくなり、照射位置を僅かに変えただけでも射出角度が大きく振れてしまうので、回折光の機械読み取りが困難となり、延いては真贋の判定が不正確になってしまう。 When performing such authentication, if the diffraction grating elements on the information recording medium are formed on the paper by transfer using the transfer foil, the irregularities of the diffraction grating elements on the transfer foil are When the surface shape conforms to the uneven shape, the scattered light and diffracted light from the diffraction grating elements that make up the surface shape are not emitted at the initially calculated angle, and a light beam with a small area such as laser light is incident In this case, the diffracted light has a wide spread, and the emission angle fluctuates greatly. Even if the irradiation position is changed slightly, the emission angle can fluctuate greatly, making it difficult to mechanically read the diffracted light. As a result, the determination of authenticity becomes inaccurate.
ところが、図１に示すように、配置する回折格子要素の格子間隔及び格子角度の設定、ならびに光散乱要素の矩形形状の設定を適切に行うことで、基板表面の凹凸形状による射出角度の変動を最小限にでき、所望の領域に回折光が確実に入射するため、撮像素子などの情報読み取り手段による読み取りが正確に行われるようになる。 However, as shown in FIG. 1, by appropriately setting the grating interval and grating angle of the diffraction grating elements to be arranged and the rectangular shape of the light scattering element, the variation of the emission angle due to the uneven shape of the substrate surface can be changed. Since it can be minimized and the diffracted light reliably enters the desired region, reading by an information reading means such as an image pickup device can be performed accurately.
また、同一領域にその散乱光及び回折光が入射するように回折格子要素を基板上に配置する際に、秘匿情報のパターン化を担う回折格子要素を不規則に配置することにより、真贋判定を行う情報を記録した領域の判別を困難とすることができる。 Further, when the diffraction grating elements are arranged on the substrate so that the scattered light and the diffracted light are incident on the same region, the authenticity determination is performed by irregularly arranging the diffraction grating elements responsible for patterning the confidential information. It is possible to make it difficult to determine the area in which information to be recorded is recorded.
一方、図２は、本発明の他の回折格子を有する情報記録媒体の構成と、この回折格子を有する情報記録媒体の真贋を判定するための、情報認証装置の概略の構成とこの装置を用いて行う秘匿情報の認証方法を模式的に示す説明図である。 On the other hand, FIG. 2 shows a configuration of an information recording medium having another diffraction grating of the present invention, a schematic configuration of an information authentication apparatus for determining the authenticity of the information recording medium having this diffraction grating, and this apparatus. It is explanatory drawing which shows typically the authentication method of the confidential information performed.
この情報認証装置は、複数個の所定の光源２２、２３と、各光源２２、２３を切り替えて所定の回折格子要素群に照明光を照射するための切り替え手段２２ａ、２３ａと、この切り替え手段２２ａ、２３ａをそれぞれ動作させて順次回折格子要素群毎に照明光を照射させ、散乱及び回折された後に散乱光及び回折光が入射する所定領域のそれぞれを投影するための投影スクリーンと、この投影スクリーンに投影されたそれぞれの領域の組み合わ
せからの所定の秘匿情報のデータを読み取るための情報読み取り手段（レンズ、撮像素子等）とを少なくとも具備してなるものである。
The information authentication apparatus includes a plurality of predetermined
光源２２と光源２３はそれぞれ異なる形状の面積を持った平面状の光源である。光源２２より照射された照明光は、回折格子要素２ａと回折格子要素２ｂによって回折し、また、光源２３より照射された照明光は、回折格子要素２ｃと回折格子要素２ｄによって散乱・回折して、投影スクリーン２７上に散乱像及び回折像が投影される。このようにして現出される秘匿情報はその構造が、図１で示したものよりも複雑であり、その解読をより一層困難とすることができる。
The
散乱光及び回折光が入射する所定領域の組み合わせによってパターン化されてなる秘匿情報は、情報読み取り手段を構成するレンズを介して、投影スクリーンに投影された像を秘匿情報として撮像素子上に記録する。そして、この記録データから所定の演算を行い、判定手段により真贋判定を行うことができる。 The secret information that is patterned by the combination of the predetermined areas where the scattered light and the diffracted light are incident is recorded on the image pickup device as the secret information through the lens constituting the information reading means as the secret information. . Then, a predetermined calculation can be performed from the recorded data, and the authenticity can be determined by the determining means.
また、図１に示した例で説明したのと同様に、同一領域に回折光が入射する回折格子要素を基板上に配置する際に、秘匿情報のパターン化を担う回折格子要素群を不規則に配置することにより、情報記録媒体においては、真贋判定を行う情報を記録した領域を判別することが困難となる。 In addition, as described in the example shown in FIG. 1, when arranging diffraction grating elements on which the diffracted light is incident on the same region on the substrate, the diffraction grating element group responsible for patterning the secret information is irregular. By arranging them in the information recording medium, it is difficult to discriminate an area in which information for authenticity determination is recorded.
１、２、３、４、５・・・回折格子要素群
１ａ、１ｂ、１ｃ、１ｄ・・・回折格子要素
１０、２０・・・基板
１１、２１・・・回折格子を有する情報記録媒体
１２、２２、２３・・・光源
１３、２４・・・照明光
１４、２５・・・散乱光及び回折光
１５、２６・・・散乱光及び回折光の全部又は一部が入射する領域
１６、２９・・・撮像素子
１７、３０・・・判定手段
２ａ、２ｂ、２ｃ、２ｄ、２ｅ、２ｆ・・・回折格子要素
１２、２２、２３・・・光源
２７・・・投影スクリーン
２８・・・レンズ
1, 2, 3, 4, 5... Diffraction grating element groups 1a, 1b, 1c, 1d... Diffraction grating elements 10, 20...
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