JP4952001B2 - Confidential information verification device for information recording medium - Google Patents
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Description
本発明は、表面に回折格子を有する複数個の微小な回折格子要素が配置されている情報記録媒体の回折格子要素の部分に対して照明光を照射することによって得られる回折光情報から所定の秘匿情報を合成し、この秘匿情報に基づいて情報記録媒体の真贋の検証が安全かつ確実に行えるようにした、情報記録媒体の秘匿情報検証装置に関する。 According to the present invention, predetermined information is obtained from diffracted light information obtained by irradiating illumination light to a portion of a diffraction grating element of an information recording medium in which a plurality of minute diffraction grating elements having a diffraction grating are arranged on the surface. The present invention relates to a secret information verification device for an information recording medium, which synthesizes secret information, and can verify the authenticity of the information recording medium safely and reliably based on the secret information.
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）を画素としてそれを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 as a pixel on a flat substrate has been used. Many have been used.
この内、２光束干渉による回折格子パターンは、２光束干渉による干渉縞を有する微小部分を、干渉縞のピッチ、方向などが各微小部分毎に変化するように感光性フィルム上に写真的手法で複数個配置させて作製されるものである（例えば、特許文献１参照。）。 Among these, the diffraction grating pattern by two-beam interference is obtained by photographic techniques on a photosensitive film so that the minute portions having interference fringes by two-beam interference are changed for each minute portion. It is produced by arranging a plurality (see, for example, Patent Document 1).
より具体的には、この回折格子パターンは、表面に回折格子を有する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や空間周波数、各回折格子要素の並べ方などを適宜変化させ、さらには回折格子要素の表面における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。 More specifically, the diffraction grating pattern is divided into a plurality of minute diffraction grating elements having a diffraction grating on the surface, and the pitch and spatial frequency of each diffraction grating element, and the diffraction grating elements. The arrangement method and the like are appropriately changed, and the direction of the diffraction grating on the surface of the diffraction grating element is changed for each diffraction grating element.
このような、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、コンピュータの制御により、平面状の基板が載置されたＸＹステージを移動させ、基板上に表面に回折格子要素を有する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、絵柄状の回折格子パターンが形成されたものが提案されている（例えば、特許文献２参照。）。 As such 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 under the control of a computer, and a diffraction grating is formed on the surface of the substrate. There has been proposed one in which a pattern-like diffraction grating pattern is formed, which is obtained by recording and arranging a plurality of minute diffraction grating elements having elements 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装置を用いて判定する方法としては、例えば、表面に回折格子を有する微小な回折格子要素（ドット）を所定の配列状態で配置してなる回折格子パターンの部分へレーザー光などを照射して回折光を得、しかる後にこの回折光から回折光情報をセンサーで読み取り、記録し、その記録情報に基づいて真贋の検証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 using a verification device, for example, minute diffraction grating elements (dots) having a diffraction grating on the surface are arranged in a predetermined arrangement state. There is a method of obtaining diffracted light by irradiating a portion of the diffraction grating pattern with laser light, and then reading and recording diffracted light information from the diffracted light with a sensor and verifying the authenticity based on the recorded information. (For example, refer to Patent Document 3).
また、微小な回折格子要素（ドット）の組合せにより、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、それをレーザー光を用いた読取装置などによって読み取って真贋の検証を行う方法も提案されている。 In addition, information is recorded as a pattern that cannot be observed with the naked eye or a pattern that cannot be identified by a combination of minute diffraction grating elements (dots), and the information is read by a reading device using laser light to verify the authenticity. A method has also been proposed.
しかしながら、このような方法で真贋の検証を行う場合、検証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、転写させ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、転写箔における回折格子の凹凸状態や回折パターンが忠実に紙の上に転写・再現されず、延いては検証時に正しい再生像を得ることが出来なくなってしまい、検証に必要な情報を明確に読み取ることが困難となっていた。 However, when verifying authenticity by such a method, if the diffraction grating pattern of the information recording medium to be verified is formed on the paper by transfer using a transfer foil, the flatness of the paper to be transferred The transfer foil is bent along the irregularities on the paper surface, and the diffraction grating irregularities and diffraction patterns on the transfer foil are not faithfully transferred / reproduced on the paper. It became impossible to obtain information, and it was difficult to clearly read information necessary for verification.
また、このような転写によって得られる回折格子パターンを有する情報記録媒体は、その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情報を記録している領域を容易に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、その情報をもとに模造品を作成することも可能となってしまう問題がある。 In addition, since an information recording medium having a diffraction grating pattern obtained by such a transfer records information in a specific area, the area where information is recorded by an observation device such as a magnifying glass can be easily obtained. If it can be discovered and the angle at which the laser beam is irradiated is known, there is a problem that it becomes possible to create a counterfeit product based on the information.
このような問題を解決するために、例えば、微小な回折格子要素によって構成される認証コードを目視で認識できない大きさで形成しておき、その部分に所定の面積を持つ光源からの光を照射して回折光を得、しかる後にその回折光に基づく回折光情報を読取装置を用いて読み取って真贋の検証を行う方法が提案されている。 In order to solve such a problem, for example, an authentication code constituted by a minute diffraction grating element is formed in a size that cannot be visually recognized, and light from a light source having a predetermined area is irradiated to that part. Thus, a method has been proposed in which diffracted light is obtained, and then diffracted light information based on the diffracted light is read using a reader to verify authenticity.
さらに、真贋の検証をより安全かつ確実に行うようにするため、情報記録媒体中の回折格子要素の構成と照明光の位置関係に関連性を持たせ、特定領域から照明される照明光によってのみ回折光が生じ、その回折光情報が所定の領域で得られるようにし、この回折光情報を読取装置を用いて読み取って真贋の検証を行うようにした方法も提案されている。 Furthermore, in order to verify the authenticity more safely and reliably, the configuration of the diffraction grating elements in the information recording medium and the positional relationship of the illumination light are related, and only by the illumination light illuminated from a specific area There has also been proposed a method in which diffracted light is generated and the diffracted light information is obtained in a predetermined region, and this diffracted light information is read using a reader to verify authenticity.
このような真贋の検証において使用される、特定領域からの所定の照明光を照射できるようにした照明手段としては、拡散光が円形の部分で発光する光源の照射面に遮光マスクが付設されていて、特定領域（遮光部分以外の部分）のみから照明光が照射できるようにしたもの、または、発光領域を分割して特定分割領域のみから照明光が照射できるようにしたものなどがある。 As a lighting means that can irradiate predetermined illumination light from a specific area used in such verification of authenticity, a light-shielding mask is attached to the irradiation surface of a light source that emits diffuse light at a circular portion. The illumination light can be irradiated only from a specific region (portion other than the light shielding portion), or the light emission region can be divided so that the illumination light can be irradiated only from the specific divided region.
しかし、このような照明手段を用いて情報記録媒体中の秘匿情報を読取る際、利用している照明手段の照明パターンを第三者が観察して知ってしまうと、その知り得た照明パターンで情報記録媒体を照明することで秘匿情報を読み出すことが可能となってしまい、延いてはその知見をもとに贋造物が不正に作製されてしまうといった問題も発生し得る。また、前記遮光マスクを用いた場合などは照明手段を実際に作動させずに装置に付設の遮光マスクの形状を見るだけで照明パターンが判ってしまうという問題があった。
本発明は、上記の問題点に鑑みなされたもので、情報記録媒体上に配置されている回折格子要素に対応した照明パターンで照明光の照射を行って秘匿情報を読み出す際に、読取装置や秘匿情報読み取り時の照明パターンを観察しても、秘匿情報の読み取りに関与する照明パターンを知り得ることが困難であり、より安全かつ確実に秘匿情報の検証が行えるようにした、情報記録媒体の隠匿情報検証装置を提供するものである。 The present invention has been made in view of the above problems, and when reading confidential information by irradiating illumination light with an illumination pattern corresponding to a diffraction grating element arranged on an information recording medium, Even if the illumination pattern at the time of reading the confidential information is observed, it is difficult to know the illumination pattern involved in the reading of the confidential information, and it is possible to verify the confidential information more safely and reliably. A concealment information verification device is provided.
以上の課題を解決すべくなされ、請求項１に記載の発明は、回折格子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、所定の面積を持つ照明手段からの照明光の照射により得られる回折光が所定空間領域に到達して回折光情報を示すようにその格子間隔および格子角度が設定され、かつそれぞれの回折格子要素からの回折光の前記所定空間領域における回折光情報の組合せにより、所定の秘匿情報が合成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検証するための装置であって、所定の分割照明領域から照明光が照射されるようになっている照明手段と、この照明手段の所定分割照明領域からの照明光の照射を回折格子要素に対して行った結果得られる前記所定空間領域における回折光情報を個別に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により得られる個別の読み取り情報中の特定情報に基づいて所定秘匿情報を合成するための秘匿情報合成手段と、この秘匿情報合成手段によって得られる秘匿情報に基づいて真贋の検証を行う検証手段とを少なくとも具備していて、前記照明手段の分割照明領域からは前記秘匿情報の合成に関与しない回折光情報に対応する回折格子要素に対しても照明光が照明されるようになっていることを特
徴とする情報記録媒体の秘匿情報検証装置である。
In order to solve the above problems, the invention according to claim 1 is characterized in that a plurality of minute diffraction grating elements having a diffraction grating are arranged on the surface of the substrate, and the plurality of diffraction grating elements have a predetermined structure. The grating interval and the grating angle are set so that the diffracted light obtained by illuminating the illumination light from the illuminating means having the area reaches the predetermined space region and shows the diffracted light information, and the diffraction from each diffraction grating element An apparatus for verifying the authenticity of an information recording medium having a diffraction grating, wherein predetermined secret information is synthesized by a combination of diffracted light information in the predetermined spatial region of light. The result is obtained by irradiating the diffraction grating element with illumination light that is irradiated with illumination light from a predetermined divided illumination area and illumination light from the predetermined divided illumination area of the illumination means. Information reading means for individually reading diffracted light information in the predetermined space region, and secret information combining means for combining predetermined secret information based on specific information in the individual read information obtained by the information reading means, And at least verification means for verifying authenticity based on the confidential information obtained by the confidential information synthesizing means, and from the divided illumination area of the illumination means to the diffracted light information not involved in the synthesis of the confidential information. The secret information verification device for an information recording medium is characterized in that the illumination light is also illuminated on the corresponding diffraction grating element.
また、請求項２に記載の発明は、請求項１記載の情報記録媒体の秘匿情報検証装置において、前記所定の面積を持つ照明手段から照射される照明光が回折格子要素に照射され、その結果得られる回折光に係る回折光情報を所定空間領域において読み取るための情報読取り手段は、前記所定空間領域の近傍に配置されているレンズと撮像素子を少なくとも具備していることを特徴とする。 According to a second aspect of the present invention, in the confidential information verification device for the information recording medium according to the first aspect, the illumination light emitted from the illumination means having the predetermined area is irradiated to the diffraction grating element, and as a result An information reading means for reading diffracted light information related to the obtained diffracted light in a predetermined space region includes at least a lens and an image sensor arranged in the vicinity of the predetermined space region.
本発明の情報記録媒体の秘匿情報認証装置は、情報記録媒体中の秘匿情報を読み出すために使用される照明手段が、所定の面積を持つ複数の分割照明領域のそれぞれから照明光が順次照射されるようになっていて、しかも秘匿情報合成手段による秘匿情報の合成に関与しない回折格子要素にもそれに対応する分割照明領域からの照明光の照射を行うと共に、情報読み取り手段での回折光情報の読取りは行わないようにして、読み取った必要データのみから秘匿情報を秘匿情報合成手段により合成し、この合成させた秘匿情報に基づいて検証手段で真偽の検証を行うようになっているため、情報読み取り手段や照明パターンを観察しても真贋の検証に係る照明光パターンを判別することが困難となり、より安全かつ確実に情報記録媒体の真贋を検証することができる。 In the confidential information authentication device for an information recording medium of the present invention, the illumination means used for reading the confidential information in the information recording medium is irradiated with illumination light sequentially from each of a plurality of divided illumination areas having a predetermined area. In addition, the diffraction grating elements that are not involved in the synthesis of the secret information by the secret information synthesizing unit are also irradiated with illumination light from the corresponding divided illumination areas, and the diffraction light information of the information reading unit Since the confidential information is synthesized from the necessary data read by the confidential information synthesizing means without performing the reading, and the authenticating means is verified by the verification means based on the synthesized confidential information, Even if the information reading means and the illumination pattern are observed, it becomes difficult to discriminate the illumination light pattern related to authenticity verification. I can testify.
以下、本発明の実施の形態を図面を参照して詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
図２は回折格子を有する情報記録媒体の概略の構成と、この回折格子を有する情報記録媒体の真贋を検証するための、従来のタイプの情報記録媒体の秘匿情報検証装置の概略の構成を示す説明図である。 FIG. 2 shows a schematic configuration of an information recording medium having a diffraction grating and a schematic configuration of a secret information verification apparatus for a conventional type information recording medium for verifying the authenticity of the information recording medium having the diffraction grating. It is explanatory drawing.
情報記録媒体を構成する基板１１の表面には、表面に微小な回折格子を有する回折格子要素１２、回折格子要素１３、回折格子要素１４、回折格子要素１５のそれぞれが配置されており、これら複数個の回折格子要素１２、１３、１４、１５は、所定の面積を持つ照明手段１６からの照明光の照射により得られる回折光が所定空間領域に到達して回折光情報を示すようにその格子間隔および格子角度が設定され、かつそれぞれの回折格子要素からの回折光の前記所定空間領域における回折光情報の組合せにより、所定の秘匿情報が合成されるようになっている。 On the surface of the substrate 11 constituting the information recording medium, a diffraction grating element 12, a diffraction grating element 13, a diffraction grating element 14, and a diffraction grating element 15 each having a minute diffraction grating on the surface are arranged. The diffraction grating elements 12, 13, 14, and 15 are arranged so that the diffracted light obtained by irradiating the illumination light from the illumination means 16 having a predetermined area reaches the predetermined space region and shows the diffracted light information. An interval and a grating angle are set, and predetermined secret information is synthesized by a combination of diffracted light information in the predetermined space region of diffracted light from each diffraction grating element.
このような構成になる情報記録媒体１の真贋の検証を従来のタイプの情報記録媒体の秘匿情報検証装置を用いて行うに当たっては、図２に示すように、所定の面積を持つ照明手
段１６から照明光を情報記録媒体１の回折格子要素１２、１３、１４、１５のそれぞれに対して照射した後、この照射によって得られる回折光を空間上に配置したレンズ１７を介して所定空間領域に配置された撮像素子１８上で回折光情報１９として捉え、この回折光情報１９により所定の秘匿情報を合成させ、合成された秘匿情報をもとに情報記録媒体の真贋を判定するようになっている。
In verifying the authenticity of the information recording medium 1 having such a configuration using a secret information verification apparatus for a conventional type information recording medium, as shown in FIG. 2, the illumination means 16 having a predetermined area is used. After irradiating illumination light to each of the diffraction grating elements 12, 13, 14, 15 of the information recording medium 1, the diffracted light obtained by this irradiation is arranged in a predetermined spatial region via a lens 17 arranged in space. The diffracted light information 19 is regarded as diffracted light information 19 on the image pickup device 18, and predetermined secret information is synthesized by the diffracted light information 19, and the authenticity of the information recording medium is determined based on the synthesized secret information. .
従来の秘匿情報検証装置は、図２からも分かるように、その一部を構成する照明手段１６は円形の部分全面から情報記録媒体１の回折格子要素１２、１３、１４、１５の配置面に向かって照明光が照射されるようになっている。このような構成の照明手段１６は比較的容易に入手可能であり、さらには照明光の回折格子要素に対する照射位置や、照明パターンなどが第三者にも容易に知られ易いので、検証時に照明に係るこれらの情報を察知し、知り得た情報に基づいて秘匿情報を容易に再生することができ、延いては贋造物が作製されていまうといった問題がある。 As can be seen from FIG. 2, the conventional secret information verification apparatus is configured such that the illumination means 16 constituting a part thereof is arranged on the arrangement surface of the diffraction grating elements 12, 13, 14, 15 of the information recording medium 1 from the entire circular portion. Illumination light is irradiated toward the camera. The illumination means 16 having such a configuration can be obtained relatively easily, and further, the irradiation position of the illumination light with respect to the diffraction grating element, the illumination pattern, etc. can be easily known to a third party. Such information is perceived, and the secret information can be easily reproduced based on the obtained information, and a forged product is produced.
一方、図１には、回折格子を有する情報記録媒体の概略の構成と、この回折格子を有する情報記録媒体の真贋を検証するための、本発明に係る情報記録媒体の秘匿情報検証装置の概略の構成が示してある。 On the other hand, FIG. 1 shows a schematic configuration of an information recording medium having a diffraction grating and an outline of a secret information verification apparatus for an information recording medium according to the present invention for verifying the authenticity of the information recording medium having the diffraction grating. The configuration is shown.
ここに示す情報記録媒体も、図２に示す情報記録媒体と同様の構成のものである。すなわち、基板１１の表面には、微小な回折格子からなる回折格子要素１２、回折格子要素１３、回折格子要素１４、回折格子要素１５がそれぞれ配置されており、これらの複数個の回折格子要素は、所定の面積を持つ照明手段２１から照明光が照射されたときに得られる回折光が所定空間領域に到達して回折光情報が得られるようにその格子間隔および格子角度が設定されていて、かつそれぞれの回折格子要素からの回折光の前記所定空間領域における回折光情報の組合せにより、所定の秘匿情報が合成されるようになっている。 The information recording medium shown here also has the same configuration as the information recording medium shown in FIG. That is, on the surface of the substrate 11, a diffraction grating element 12, a diffraction grating element 13, a diffraction grating element 14, and a diffraction grating element 15 each consisting of a minute diffraction grating are arranged, respectively. The grating interval and the grating angle are set so that the diffracted light obtained when the illumination light is irradiated from the illuminating means 21 having a predetermined area reaches the predetermined space region to obtain the diffracted light information, In addition, predetermined secret information is synthesized by a combination of diffracted light information in the predetermined space region of the diffracted light from each diffraction grating element.
このような構成になる情報記録媒体の真贋の判定を行うための、本発明に係る秘匿情報認証装置は、大略的には前述した従来の秘匿情報認証装置と同じような構成であるが、照明手段の構成が大きく異なっている。 The confidential information authenticating device according to the present invention for determining the authenticity of the information recording medium having such a configuration is generally similar in configuration to the conventional confidential information authenticating device described above, The structure of the means is greatly different.
すなわち、この秘匿情報認証装置は、所定の分割照明領域２２、２３、２４、２５のそれぞれから照明光が照射されるようになっている照明手段２１と、この照明手段２１の所定分割照明領域からの照明光の照射を回折格子要素に対して順次行った結果得られる前記所定空間領域における回折光情報を個別に読み取るための情報読み取り手段３０と、この情報読み取り手段３０により得られる個別の読み取り情報中の特定情報に基づいて所定の秘匿情報を合成するための秘匿情報合成手段３１と、この秘匿情報合成手段３１によって得られる秘匿情報に基づき真贋の検証を行う検証手段３２とを少なくとも具備していて、前記照明手段２１からはその一部の分割照明領域から前記秘匿情報の合成に関与しない回折光情報に対応する回折格子要素に対しても照明光が順次照明されるようになっている。 That is, the secret information authenticating device includes an illuminating unit 21 configured to irradiate illumination light from each of the predetermined divided illumination regions 22, 23, 24, and 25, and the predetermined divided illumination region of the illuminating unit 21. Information reading means 30 for individually reading the diffracted light information in the predetermined space region obtained as a result of sequentially irradiating the illumination light on the diffraction grating elements, and individual reading information obtained by the information reading means 30 At least a secret information synthesizing unit 31 for synthesizing predetermined secret information based on the specific information therein, and a verification unit 32 for verifying authenticity based on the secret information obtained by the secret information synthesizing unit 31 From the illumination means 21, a diffraction grating element corresponding to diffracted light information not involved in the synthesis of the secret information from a part of the divided illumination area is required. So that the illumination light is sequentially illuminated against.
図に示す照明手段２１は円形の照明部分を有しており、この部分は領域２２、領域２３、領域２４、領域２５に分割されていて、各分割領域からは独立して照明光が情報記録媒体１の各回折格子要素１２、１３、１４、１５に向かって照射できるようになっている。図２は、領域２３と領域２５の部分が発光して照明光が照射されていて、領域２２と領域２４の部分は消灯されていて照明光が照射されていない状態を示している。 Illuminating means 21 shown in the figure has a circular illumination portion, which is divided into region 22, region 23, region 24, and region 25, and illumination light is recorded on the information independently of each divided region. Irradiation can be performed toward each diffraction grating element 12, 13, 14, 15 of the medium 1. FIG. 2 shows a state where the regions 23 and 25 emit light and are irradiated with illumination light, and the regions 22 and 24 are turned off and are not irradiated with illumination light.
このような照明手段２１においては、分割照明領域２２から照明光が情報記録媒体１中の回折格子要素１２の部分に照射されることにより回折光が得られ、その回折光情報が情報読み取り手段３０により所定空間領域に配置された撮像素子２８おいて回折光情報として読み取られるようになっている。同様に、分割照明領域２３から照明光が情報記録媒体
１中の回折格子要素１３の部分に照射されることにより回折光が得られ、その回折光情報が情報読み取り手段３０により所定空間領域に配置された撮像素子２８おいて回折光情報として読み取られ、また、分割照明領域２４から照明光が情報記録媒体１中の回折格子要素１４の部分に照射されることにより回折光が得られ、その回折光情報が情報読み取り手段３０により所定空間領域に配置された撮像素子２８おいて回折光情報として読み取られ、そして、分割照明領域２５から照明光が情報記録媒体１中の回折格子要素１５の部分に照射されることにより回折光が得られ、その回折光情報が情報読み取り手段３０により所定空間領域に配置された撮像素子２８おいて回折光情報として読み取られる。
In such an illuminating means 21, the diffracted light is obtained by irradiating the illumination light from the divided illumination region 22 onto the portion of the diffraction grating element 12 in the information recording medium 1, and the diffracted light information is obtained as the information reading means 30. As a result, the image sensor 28 arranged in a predetermined space region can read the diffracted light information. Similarly, diffracted light is obtained by irradiating illumination light from the divided illumination region 23 onto the portion of the diffraction grating element 13 in the information recording medium 1, and the diffracted light information is arranged in a predetermined space region by the information reading means 30. The diffracted light information is read by the image pickup device 28, and the diffracted light is obtained by irradiating the portion of the diffraction grating element 14 in the information recording medium 1 with the illumination light from the divided illumination region 24. The optical information is read as diffracted light information by the image reading device 28 arranged in a predetermined space area by the information reading means 30, and the illumination light from the divided illumination area 25 enters the portion of the diffraction grating element 15 in the information recording medium 1. The diffracted light is obtained by irradiation, and the diffracted light information is read as diffracted light information by the image reading device 28 arranged in a predetermined space region by the information reading means 30. It is taken.
照明手段２１からの照明光の照射状態が、図２に示すような状態、すなわち領域２３と領域２５とから照射光が照射される状態では、回折格子要素１３と回折格子要素１５の部分で照射光が回折され、その回折光情報が情報読み取り装置３０を構成し、所定空間領域配置されている撮像素子２８において読み取られる。このような照明手段２１の所定分割照明領域からの照明光の照射を他の回折格子要素に対して順次行った結果得られる所定照明領域からの照明光の照射に対応する回折光情報を情報読み取り手段３０で個別に読み取り、さらに情報読み取り手段３０の個別読み取り情報に基づいて秘匿情報合成手段３１により秘匿情報を合成する。そして最後に、秘匿情報合成手段３１により得られた秘匿隠匿情報が所定の情報と符合するか否かの判断を検証手段３２により行い、真贋の検証を行えるようになっている。 When the illumination light irradiation state from the illumination means 21 is as shown in FIG. 2, that is, the irradiation light is irradiated from the region 23 and the region 25, the diffraction grating element 13 and the diffraction grating element 15 are irradiated. The light is diffracted, and the diffracted light information constitutes the information reading device 30 and is read by the image sensor 28 arranged in a predetermined space region. Information reading of diffracted light information corresponding to irradiation of illumination light from a predetermined illumination region obtained as a result of sequentially irradiating illumination light from the predetermined divided illumination region of the illumination means 21 to other diffraction grating elements is performed. The information is individually read by the means 30, and the secret information is synthesized by the secret information synthesizing means 31 based on the individual read information of the information reading means 30. Finally, the verification unit 32 determines whether or not the confidential information obtained by the confidential information synthesizing unit 31 matches predetermined information, so that the authenticity can be verified.
このように、本発明の秘匿情報認証装置においては、分割された各分割照明領域のそれぞれから照明光が別個に照射されるようになっていると共に、各分割照明領域毎に順次照明光が照射されるようにコントロールしてある。このとき、秘匿情報合成手段３１による秘匿情報の合成に関与しない回折格子要素にもそれに対応する分割照明領域からの照明光の照射を行うが、情報読み取り手段３１での回折光情報の読取りは行わないようにし、読み取った必要データのみから秘匿情報を秘匿情報合成手段３１により合成し、上述したようにして、情報記録媒体の真贋を検証する。 Thus, in the confidential information authentication device of the present invention, the illumination light is irradiated separately from each of the divided divided illumination areas, and the illumination light is sequentially irradiated for each divided illumination area. It is controlled to be done. At this time, illumination light from the corresponding divided illumination area is also irradiated to the diffraction grating elements not involved in the synthesis of the secret information by the secret information synthesizing unit 31, but the information reading unit 31 reads the diffracted light information. The secret information is synthesized from the read necessary data only by the secret information synthesizing means 31, and the authenticity of the information recording medium is verified as described above.
以上のような装置によって情報記録媒体の真贋を検証する場合は、その回折光情報取得に際して行われる情報記録媒体への照明光の照射は、照明手段２１の全ての分割照明領域において順次行われるため、、どの分割照明領域からの照明光の照射によって秘匿情報に関連する回折光情報が取り込まれるのか判別することが困難となる。 When verifying the authenticity of the information recording medium using the apparatus as described above, the irradiation of the illumination light to the information recording medium performed when acquiring the diffracted light information is sequentially performed in all the divided illumination areas of the illumination means 21. It becomes difficult to determine which diffracted light information related to the confidential information is captured by irradiation of illumination light from which divided illumination area.
このため、遮光マスクを用いて照明光の照射領域を制限して行うタイプの照明手段を有する従来の隠匿情報検証装置と比較すると、検証時の照明パターンが第三者に察知されることがないため、安全に情報記録媒体の秘匿情報の真贋を検証することが可能となる。 For this reason, the illumination pattern at the time of verification is not perceived by a third party as compared with a conventional concealment information verification apparatus having an illumination means of a type that restricts the illumination light irradiation area using a light shielding mask. Therefore, it is possible to safely verify the authenticity of the confidential information on the information recording medium.
１・・・情報記録媒体
１１・・・基板
１２、１３、１４、１５・・・回折格子要素
１６、２１・・・照明手段
１７、２７・・・レンズ
１８、２８・・・撮像素子
１９、２９・・・回折光情報
２２、２３、２４、２５・・・分割照明領域
３０・・・情報読み取り装置
３１・・・秘匿情報合成手段
３１・・・検証手段
DESCRIPTION OF SYMBOLS 1 ... Information recording medium 11 ... Board | substrate 12, 13, 14, 15 ... Diffraction grating element 16, 21 ... Illumination means 17, 27 ... Lens 18, 28 ... Imaging element 19, 29 ... Diffracted light information 22, 23, 24, 25 ... Divided illumination area 30 ... Information reading device 31 ... Secret information combining means 31 ... Verification means
Claims (2)
The information reading means for reading the diffracted light information related to the diffracted light obtained as a result of irradiating the diffraction grating element with the illumination light emitted from the illumination means having the predetermined area, The secret information verification device for an information recording medium according to claim 1, further comprising at least a lens and an image sensor disposed in the vicinity of the information recording medium.
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