JP2008065410A - Information authentication method, information authentication apparatus, and information recording medium - Google Patents
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Abstract
【課題】情報記録媒体が表面平滑性の悪い基材を用いた場合でも、基材の影響を受けずに、情報認証が確実に行うことができる情報認証方法、装置、及び情報記録媒体を提供する。
【解決手段】照明ステップＳ１、光学ステップＳ２、撮像ステップＳ３、変換ステップＳ４、及び処理ステップＳ５を設ける。そして、情報記録媒体上の情報記録部と情報記録背景部から構成される情報記録領域の光強度分布、すなわち、情報記録部からの正反射光強度と情報記録背景部からの正反射光強度の強度差を得ることで、情報パターンとしての記録情報を取得し、情報認証を確実に行えるようにした。特に、情報記録媒体の基材の表面平滑性が悪い場合などでも、基材の影響を受けずに、情報認証を確実に行える。
【選択図】図１
Provided is an information authentication method, apparatus, and information recording medium capable of reliably performing information authentication without being affected by the base material even when the information recording medium uses a base material with poor surface smoothness. To do.
An illumination step S1, an optical step S2, an imaging step S3, a conversion step S4, and a processing step S5 are provided. And the light intensity distribution of the information recording area composed of the information recording part and the information recording background part on the information recording medium, that is, the specular reflection light intensity from the information recording part and the specular reflection light intensity from the information recording background part. By obtaining the intensity difference, the recorded information as the information pattern was acquired, and the information authentication could be performed reliably. In particular, even when the surface smoothness of the base material of the information recording medium is poor, information authentication can be reliably performed without being affected by the base material.
[Selection] Figure 1
Description
本発明は、肉眼では認知することができない記録情報を保持する情報記録部と情報記録背景部とからなる情報記録領域を光反射層上に設けた情報記録媒体と、情報記録媒体の認証を行う情報認証方法及び情報認証装置に関する。 The present invention performs authentication of an information recording medium provided with an information recording area including an information recording section that holds recording information that cannot be recognized by the naked eye and an information recording background section on a light reflection layer, and the information recording medium The present invention relates to an information authentication method and an information authentication device.
従来から、平面状の基材上に、複数個の格子縞を有する回折格子セルから形成されている情報記録媒体が多く使用されてきている。
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て、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１参照）。
また、このような回折格子を有する情報記録媒体の真贋を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発生させ、その回折光をセンサーで受光し、回折光情報に基づいて判定を行う方法が採用されている（例えば、特許文献２参照）。
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, so that a plurality of minute diffraction grating elements are arranged 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 obtained by recording and arranging pieces in a pattern is formed (see, for example, Patent Document 1).
In addition, as a method for determining the authenticity of an information recording medium having such a diffraction grating, for example, a pattern information portion recorded in an array of minute diffraction grating elements (dots) is irradiated with laser light or the like for diffraction. A method is adopted in which light is generated, the diffracted light is received by a sensor, and determination is made based on diffracted light information (see, for example, Patent Document 2).
しかしながら、上述のようにし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分かってしまえば、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。
また、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、転写する紙の平滑性の影響を大きく受けてしまう。すなわち、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、情報を明確に判定することが困難となっていた。
However, since the information recording medium having the diffraction grating obtained as described above records information in a specific area, it is easy to find an area where information is recorded by 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.
Further, when authenticity determination is performed 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 smoothness of the paper to be transferred It will be greatly affected. In other words, since the transfer foil is bent along the unevenness of the paper surface, the uneven state and pattern of the diffraction grating in the transfer foil are not faithfully transferred / reproduced on the paper, and as a result, a correct reproduced image can be obtained at the time of determination. It became impossible to determine information clearly.
一方、基板表面に反射型回折格子を設けてこの回折格子に情報を記録・保持させ、特定の光源からの照明光に応答して発生した反射回折光の方向で前記記録情報を再現する情報記録媒体は知られている。
このような情報記録媒体は、転写技術を利用して製造されているものが多く、これらの情報記録媒体はＩＤカード、パスポートや製品認証等の真正証明に利用されている。しかしながら、反射回折光の回折方向は、回折格子の方向と空間周波数、並びに、再生用光線の波長と照射方向によって決まるため、記録情報を再現する光源と回折光を受光するセンサー等の位置関係が分かってしまうと、これらを基に報記録媒体を簡単に偽造することが可能となってしまう。
On the other hand, a reflective diffraction grating is provided on the surface of the substrate, information is recorded and held on this diffraction grating, and the recorded information is reproduced in the direction of reflected diffracted light generated in response to illumination light from a specific light source. The medium is known.
Many of such information recording media are manufactured using a transfer technique, and these information recording media are used for authenticating ID cards, passports, product authentication, and the like. However, since the diffraction direction of the reflected diffracted light is determined by the direction and spatial frequency of the diffraction grating, and the wavelength and irradiation direction of the light beam for reproduction, there is a positional relationship between the light source that reproduces the recorded information and the sensor that receives the diffracted light. If it becomes clear, it becomes possible to easily forge the information recording medium based on these.
本発明は、上記のような問題点に鑑みてなされたものであり、情報記録媒体の基材の表面平滑性が悪い場合などでも、基材の影響を受けずに情報認証が確実に行うことができる情報認証方法、情報認証装置、及び情報記録媒体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 the base material of the information recording medium is poor, the information authentication is reliably performed without being affected by the base material. An object of the present invention is to provide an information authentication method, an information authentication apparatus, and an information recording medium.
上述の目的を達成するため、本発明の情報認証方法は、基材上の光反射層に情報記録部及び情報記録背景部から構成される情報記録領域を設けた情報記録媒体の認証を行う情報認証方法であって、前記情報記録媒体に照明光を照射する照明ステップと、前記情報記録領域からの反射光のうち略正反射光成分を抽出する光学ステップと、前記光学ステップによって抽出した正反射光を受光して前記情報記録領域を撮像する撮像ステップと、撮像した情報記録領域の光強度分布を情報パターンとして電気信号に変換し、前記情報記録領域が保持する記録情報を取得する変換ステップと、前記記録情報を所定の規則に従ってデコードする処理ステップとを有することを特徴とする。なお、前記情報記録領域の光強度分布は、前記情報記録部の光強度と前記情報記録背景部の光強度の強度差から成り、前記強度差が情報パターンを成すことを特徴とする。 In order to achieve the above-described object, the information authentication method of the present invention is an information authentication method for authenticating an information recording medium in which an information recording area including an information recording portion and an information recording background portion is provided on a light reflection layer on a substrate. An authentication method comprising: an illumination step of irradiating the information recording medium with illumination light; an optical step of extracting a substantially specularly reflected light component from the reflected light from the information recording region; and a regular reflection extracted by the optical step An imaging step of receiving light to image the information recording area, a conversion step of converting the light intensity distribution of the imaged information recording area into an electrical signal as an information pattern, and acquiring recording information held by the information recording area; And a process step of decoding the recorded information in accordance with a predetermined rule. The light intensity distribution in the information recording area is composed of a difference in intensity between the light intensity in the information recording portion and the light intensity in the information recording background portion, and the intensity difference forms an information pattern.
また本発明の情報認証装置は、基材上の光反射層に情報記録部及び情報記録背景部から構成される情報記録領域を設けた情報記録媒体の認証を行う情報認証装置であって、前記情報記録媒体に照明光を照射する照明手段と、前記情報記録領域からの反射光のうち略正反射光成分を抽出する光学手段と、前記光学手段によって抽出した正反射光を受光して前記情報記録領域を撮像する撮像手段と、撮像した情報記録領域の光強度分布を情報パターンとして電気信号に変換し、前記情報記録領域が保持する記録情報を取得する変換手段と、前記記録情報を所定の規則に従ってデコードする処理手段とを有することを特徴とする。なお、前記情報記録領域の光強度分布は、前記情報記録部の光強度と前記情報記録背景部の光強度の強度差から成り、前記強度差が情報パターンを成すことを特徴とする。また、前記照明手段は所定の面積を有する拡散光源を有することを特徴とする。また、前記光学手段は多数のセル群からなる情報記録部と多数の回折格子セル群からなる情報記録背景部の反射光のうち略正反射光成分を抽出することを特徴とする。 The information authentication device of the present invention is an information authentication device for authenticating an information recording medium provided with an information recording area composed of an information recording portion and an information recording background portion on a light reflection layer on a base material. Illuminating means for illuminating the information recording medium with illumination light, optical means for extracting a substantially specularly reflected light component from the reflected light from the information recording area, and receiving the specularly reflected light extracted by the optical means to receive the information Imaging means for imaging the recording area, conversion means for converting the light intensity distribution of the imaged information recording area into an electrical signal as an information pattern, and acquiring recording information held in the information recording area; and And processing means for decoding according to a rule. The light intensity distribution in the information recording area is composed of a difference in intensity between the light intensity in the information recording portion and the light intensity in the information recording background portion, and the intensity difference forms an information pattern. The illuminating means may include a diffused light source having a predetermined area. The optical means is characterized by extracting a substantially regular reflection light component from the reflected light of the information recording portion comprising a large number of cell groups and the information recording background portion comprising a large number of diffraction grating cell groups.
また本発明は、情報記録媒体は、基材上の光反射層に情報記録部及び情報記録背景部から構成される情報記録領域を設けた情報記録媒体であって、前記情報記録背景部には、光吸収素子または／及び光散乱素子または／及び回折格子素子を有する光学素子が配置されていることを特徴とする。なお、前記基材は、紙または布または皮または木等の粗面からなることを特徴とする。また、前記光散乱素子は光散乱要素の凹凸形状を含むことを特徴とする。 The present invention is also an information recording medium in which an information recording area comprising an information recording portion and an information recording background portion is provided on a light reflection layer on a substrate, and the information recording background portion includes: An optical element having a light absorbing element or / and a light scattering element or / and a diffraction grating element is arranged. The substrate is characterized by comprising a rough surface such as paper, cloth, leather or wood. Further, the light scattering element includes an uneven shape of the light scattering element.
本発明の情報認証方法、及び情報認証装置によれば、情報記録媒体の肉眼では認知することができない記録情報を認証する際に、情報記録領域の光強度分布（例えば情報記録部からの正反射光強度と情報記録背景部からの正反射光強度の強度差）を得ることで、情報パターンとしての記録情報を取得するため、確実な情報認証が可能であり、特に、情報記録媒体の基材の表面平滑性が悪い場合などでも、基材の影響を受けずに確実な情報認証を行うことができる。
また本発明の情報記録媒体によれば、情報記録背景部に、光吸収素子または／及び光散乱素子または／及び回折格子素子を有する光学素子を配置したことにより、上述した情報記録領域の光強度分布から情報パターンとしての記録情報を取得する情報認証方法、及び情報認証装置に適した情報記録媒体を提供することができ、確実な情報認証に寄与できる。
According to the information authentication method and the information authentication apparatus of the present invention, when authenticating recorded information that cannot be recognized by the naked eye of the information recording medium, the light intensity distribution in the information recording area (for example, regular reflection from the information recording unit). By obtaining the light intensity and the intensity difference between the specular reflected light intensity from the information recording background part), the recorded information as the information pattern is obtained, so that reliable information authentication is possible. In particular, the base material of the information recording medium Even when the surface smoothness is poor, reliable information authentication can be performed without being affected by the base material.
Further, according to the information recording medium of the present invention, the light intensity of the information recording area described above is obtained by arranging the optical element having the light absorbing element or / and the light scattering element or / and the diffraction grating element in the information recording background portion. An information authentication method for acquiring recorded information as an information pattern from the distribution and an information recording medium suitable for the information authentication apparatus can be provided, which can contribute to reliable information authentication.
本発明の実施の形態では、情報記録媒体上の情報記録部と情報記録背景部から構成される情報記録領域の光強度分布、すなわち、情報記録部からの正反射光強度と情報記録背景部からの正反射光強度の強度差を得ることで、情報パターンとしての記録情報を取得し、情報認証を確実に行えるようにしたものであり、特に、情報記録媒体の基材の表面平滑性が悪い場合などでも、基材の影響を受けずに、情報認証を確実に行えるものである。 In the embodiment of the present invention, the light intensity distribution of the information recording area composed of the information recording portion and the information recording background portion on the information recording medium, that is, from the specular reflection light intensity from the information recording portion and the information recording background portion. By obtaining the intensity difference of the intensity of regular reflection light, it is possible to acquire recording information as an information pattern and reliably perform information authentication. In particular, the surface smoothness of the base material of the information recording medium is poor. Even in cases, information authentication can be performed reliably without being affected by the base material.
以下、本発明の実施の形態を図面を参照しながら詳細に説明する。
図１は本発明の実施の形態による情報認証方法の概念を説明するためのフローチャートである。
図示のように、本例の情報認証方法は、照明ステップＳ１、光学ステップＳ２、撮像ステップＳ３、変換ステップＳ４、及び処理ステップＳ５から構成される。本例で用いる情報記録媒体は、紙または布または皮または木等の粗面からなる基材上の光反射層を設け、この光反射層に、多数のセル群からなる情報記録部及び多数の回折格子セル群からなる情報記録背景部から構成される情報記録領域を設けたものである。そして、情報記録背景部には、光吸収素子または／及び光散乱素子または／及び回折格子素子を有する光学素子が配置されている。また、光散乱素子は光散乱要素の凹凸形状を含むものである。
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a flowchart for explaining the concept of an information authentication method according to an embodiment of the present invention.
As shown in the figure, the information authentication method of this example includes an illumination step S1, an optical step S2, an imaging step S3, a conversion step S4, and a processing step S5. The information recording medium used in this example is provided with a light reflecting layer on a base material made of a rough surface such as paper, cloth, leather, or wood, and this light reflecting layer is provided with an information recording unit consisting of a number of cell groups and a number of cells. An information recording area composed of an information recording background portion composed of a diffraction grating cell group is provided. In the information recording background portion, an optical element having a light absorbing element or / and a light scattering element or / and a diffraction grating element is arranged. The light scattering element includes the uneven shape of the light scattering element.
また、図１において、照明ステップＳ１は、所定の面積を有する拡散光源によって情報記録媒体に照明光を照射するステップである。また、光学ステップＳ２は、情報記録領域からの反射光のうち略正反射光成分を抽出するステップである。また、撮像ステップＳ３は、光学ステップＳ２によって抽出した正反射光を受光して情報記録領域を撮像するステップである。
また、変換ステップＳ４は、撮像した情報記録領域の光強度分布を情報パターンとして電気信号に変換し、情報記録領域が保持する記録情報を取得するステップである。ここで、情報記録領域の光強度分布は、情報記録部の光強度と情報記録背景部の光強度の強度差から成り、この強度差が情報パターンを成すようにしたものである。また、処理ステップＳ５は、変換ステップＳ４によって取得した記録情報を所定の規則に従ってデコードするステップである。
In FIG. 1, illumination step S1 is a step of irradiating the information recording medium with illumination light by a diffusion light source having a predetermined area. The optical step S2 is a step of extracting a substantially regular reflection light component from the reflection light from the information recording area. The imaging step S3 is a step of receiving the regular reflection light extracted in the optical step S2 and imaging the information recording area.
The conversion step S4 is a step of converting the light intensity distribution of the imaged information recording area into an electrical signal as an information pattern, and acquiring recording information held in the information recording area. Here, the light intensity distribution of the information recording area is composed of a difference in intensity between the light intensity of the information recording portion and the light intensity of the information recording background portion, and this intensity difference forms an information pattern. Further, the processing step S5 is a step of decoding the recording information acquired in the conversion step S4 according to a predetermined rule.
図２は本実施の形態による情報認証方法の概念を説明するための説明図である。
図２において、情報記録領域２は情報記録媒体１の基材上に設けられた光反射層に設けられており、情報記録部３と情報記録背景部４を有する。
そして、所定の角度から１つあるいは複数個の拡散光源照明５（電源５ａ）からの照明光６が照射されたときの情報記録領域２からの反射光７が光学手段８を通過する。ここで、光学手段８を通過する際に、正反射光９のみが抽出され、正反射光９のみが撮像手段１０で受光される。そして、受光した正反射光を変換手段１１で情報記録領域が保持する秘匿情報として電気信号に変化し、処理手段１２へ送られる。
処理手段１２では、記録情報を所定の規則に従ってデコードし、情報記録領域が保持する記録情報の判定を行う。
FIG. 2 is an explanatory diagram for explaining the concept of the information authentication method according to the present embodiment.
In FIG. 2, the
Then, the
The processing means 12 decodes the recorded information according to a predetermined rule, and determines the recorded information held in the information recording area.
図３は図１及び図２に示した情報認証方法を適用した情報認証装置の概略を説明するための説明図であり、基本的には図２に示す内容と共通している。
すなわち、図３に示す装置において、情報記録領域２２は情報記録媒体２１の基材上に設けられた光反射層に設けられており、情報記録部２３と情報記録背景部２４を有する。
そして、所定の角度から１つあるいは複数個の拡散光源照明２５（電源２５ａ）からの照明光２６が照射されたときの情報記録領域２２からの反射光２７が光学手段２８を通過する。光学手段２８を通過する際に、正反射光２９のみが抽出され、正反射光２９のみが、カメラ３０ａとレンズ３０ｂから構成される撮像手段３０で受光される。
そして、受光した正反射光を変換手段３１で情報記録領域が保持する記録情報として電気信号に変化し、処理手段３２へ送られる。処理手段３２では秘匿情報を所定の規則に従ってデコードし、情報記録領域が保持する記録情報の判定を行う。
FIG. 3 is an explanatory diagram for explaining the outline of the information authentication apparatus to which the information authentication method shown in FIGS. 1 and 2 is applied, and is basically the same as the contents shown in FIG.
That is, in the apparatus shown in FIG. 3, the information recording area 22 is provided in a light reflection layer provided on the base material of the
Then, the
The received regular reflection light is converted into an electrical signal as recording information held in the information recording area by the conversion means 31 and sent to the processing means 32. The processing means 32 decodes the confidential information according to a predetermined rule, and determines the recording information held in the information recording area.
Ｓ１……照明ステップ、Ｓ２……光学ステップ、Ｓ３……撮像ステップ、Ｓ４……変換ステップ、Ｓ５……処理ステップ、１、２１……情報記録媒体、２、２２……情報記録領域、３、２３……情報記録部、４、２４……情報記録背景部、５、２５……拡散光源照明、６、２６……照明光、７、２７……反射光、８、２８……光学手段、９、２９……正反射光、１０、３０……撮像手段、１１、３１……変換手段、１２、３２……処理手段。
S1: Illumination step, S2: Optical step, S3: Imaging step, S4: Conversion step, S5: Processing step, 21, 21 ... Information recording medium, 2, 22 ... Information recording area, 3, 23 …… Information recording unit, 4, 24 …… Information recording background unit, 5, 25 …… Diffusion light source illumination, 6, 26 …… Illumination light, 7, 27 …… Reflected light, 8, 28 …… Optical means, 9, 29 ... Regular reflection light, 10, 30 ... Imaging means, 11, 31 ... Conversion means, 12, 32 ... Processing means.
Claims (9)
前記情報記録媒体に照明光を照射する照明ステップと、
前記情報記録領域からの反射光のうち略正反射光成分を抽出する光学ステップと、
前記光学ステップによって抽出した正反射光を受光して前記情報記録領域を撮像する撮像ステップと、
撮像した情報記録領域の光強度分布を情報パターンとして電気信号に変換し、前記情報記録領域が保持する記録情報を取得する変換ステップと、
前記記録情報を所定の規則に従ってデコードする処理ステップと、
を有することを特徴とする情報認証方法。 An information authentication method for authenticating an information recording medium provided with an information recording area composed of an information recording portion and an information recording background portion on a light reflecting layer on a substrate,
An illumination step of illuminating the information recording medium with illumination light;
An optical step of extracting a substantially specularly reflected light component from the reflected light from the information recording area;
An imaging step of receiving the regular reflection light extracted by the optical step and imaging the information recording area;
A conversion step of converting the light intensity distribution of the imaged information recording area into an electrical signal as an information pattern, and acquiring recording information held by the information recording area;
A processing step of decoding the recorded information according to a predetermined rule;
An information authentication method characterized by comprising:
前記情報記録媒体に照明光を照射する照明手段と、
前記情報記録領域からの反射光のうち略正反射光成分を抽出する光学手段と、
前記光学手段によって抽出した正反射光を受光して前記情報記録領域を撮像する撮像手段と、
撮像した情報記録領域の光強度分布を情報パターンとして電気信号に変換し、前記情報記録領域が保持する記録情報を取得する変換手段と、
前記記録情報を所定の規則に従ってデコードする処理手段と、
を有することを特徴とする情報認証装置。 An information authentication device for authenticating an information recording medium provided with an information recording area composed of an information recording portion and an information recording background portion on a light reflection layer on a substrate,
Illuminating means for illuminating the information recording medium with illumination light;
Optical means for extracting a substantially specularly reflected light component from the reflected light from the information recording area;
Imaging means for receiving the specularly reflected light extracted by the optical means and imaging the information recording area;
Conversion means for converting the light intensity distribution of the imaged information recording area into an electrical signal as an information pattern, and acquiring recording information held by the information recording area;
Processing means for decoding the recorded information according to a predetermined rule;
An information authentication apparatus comprising:
前記情報記録背景部には、光吸収素子または／及び光散乱素子または／及び回折格子素子を有する光学素子が配置されていることを特徴とする情報記録媒体。 An information recording medium provided with an information recording area composed of an information recording portion and an information recording background portion on a light reflecting layer on a substrate,
An information recording medium, wherein an optical element having a light absorbing element or / and a light scattering element or / and a diffraction grating element is arranged in the information recording background portion.
9. The information recording medium according to claim 7, wherein the light scattering element includes an uneven shape of a light scattering element.
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| US9939466B2 (en) | 2009-07-27 | 2018-04-10 | Iii Holdings 3, Llc | Non-contact current sensor |
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