JP2011128416A - Information recording medium, method for manufacturing the same, and information reading method - Google Patents
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- 238000000034 method Methods 0.000 title abstract description 23
- 238000004519 manufacturing process Methods 0.000 title abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 239000004988 Nematic liquid crystal Substances 0.000 claims abstract description 17
- UWCWUCKPEYNDNV-LBPRGKRZSA-N 2,6-dimethyl-n-[[(2s)-pyrrolidin-2-yl]methyl]aniline Chemical compound CC1=CC=CC(C)=C1NC[C@H]1NCCC1 UWCWUCKPEYNDNV-LBPRGKRZSA-N 0.000 claims abstract description 13
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 10
- 239000004973 liquid crystal related substance Substances 0.000 claims description 32
- 239000010409 thin film Substances 0.000 claims description 15
- 239000000758 substrate Substances 0.000 claims description 14
- 230000010287 polarization Effects 0.000 claims description 9
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 238000012795 verification Methods 0.000 abstract description 11
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- 239000006249 magnetic particle Substances 0.000 description 9
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 6
- 239000000835 fiber Substances 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 239000010935 stainless steel Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 4
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- 230000003287 optical effect Effects 0.000 description 3
- -1 polyethylene terephthalate Polymers 0.000 description 3
- 229920002799 BoPET Polymers 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- UHFFVFAKEGKNAQ-UHFFFAOYSA-N 2-benzyl-2-(dimethylamino)-1-(4-morpholin-4-ylphenyl)butan-1-one Chemical compound C=1C=C(N2CCOCC2)C=CC=1C(=O)C(CC)(N(C)C)CC1=CC=CC=C1 UHFFVFAKEGKNAQ-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- CSNCPNFITVRIBQ-UHFFFAOYSA-N [6-[4-[4-(4-prop-2-enoyloxybutoxycarbonyloxy)benzoyl]oxybenzoyl]oxy-2,3,3a,5,6,6a-hexahydrofuro[3,2-b]furan-3-yl] 4-[4-(4-prop-2-enoyloxybutoxycarbonyloxy)benzoyl]oxybenzoate Chemical compound C1=CC(OC(=O)OCCCCOC(=O)C=C)=CC=C1C(=O)OC1=CC=C(C(=O)OC2C3OCC(C3OC2)OC(=O)C=2C=CC(OC(=O)C=3C=CC(OC(=O)OCCCCOC(=O)C=C)=CC=3)=CC=2)C=C1 CSNCPNFITVRIBQ-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000003098 cholesteric effect Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 239000011521 glass Substances 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 230000009878 intermolecular interaction Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920006284 nylon film Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
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- 238000010345 tape casting Methods 0.000 description 1
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- Credit Cards Or The Like (AREA)
- Liquid Crystal (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
Abstract
Description
本発明は、真偽の検証が可能な固有情報を有する情報記録媒体と、その製造方法及び情報読取方法に関する。 The present invention relates to an information recording medium having unique information capable of authenticity verification, a manufacturing method thereof, and an information reading method.
偽造防止対策が施されているカード類、通帳類、金券、証書類等の有価証券類等の情報記録媒体やその真偽を検証するための手段として、例えば、特許文献１に開示されているような、ステンレスファイバをランダムに分布させてなる情報記録媒体と、その媒体中のステンレスファイバの分布状態をマイクロ波を照射させながら照合し、真偽の検証ができるようにした技術がある。これは、媒体中にランダムに分布させた微細なステンレスファイバに対して照射したマイクロ波から得られる応答マイクロ波束を一定のルールに従ってデジタルマークとして記録しておき、媒体の真偽を検証する場合には、媒体にマイクロ波を照射させることによって得られる応答マイクロ波束に応じて決定されるデジタルマークを記録済みのデジタルマークと比較照合するようにしたものである。比較照合に際し、両者が一致した場合にはその媒体を真正物と判定する。 For example, Patent Document 1 discloses information recording media such as cards, passbooks, cash vouchers, certificate documents and other securities for which anti-counterfeit measures have been taken, and means for verifying their authenticity. There is a technology that enables verification of authenticity by collating the information recording medium in which stainless steel fibers are randomly distributed and the distribution state of the stainless steel fibers in the medium while irradiating the microwaves. This is a case where the response microwave packet obtained from the microwave irradiated to the fine stainless steel fiber randomly distributed in the medium is recorded as a digital mark according to a certain rule, and the authenticity of the medium is verified. Is a method in which a digital mark determined according to a response microwave flux obtained by irradiating a medium with microwaves is compared with a recorded digital mark. At the time of comparison and collation, if both match, the medium is determined to be genuine.
ところが、このマイクロ波を用いる真偽の検証方法においては、導電性ステンレスファイバを情報記録媒体（例えば、プラスチックカード）の全体に渡って分布させることになり、マイクロ波を照射して真偽を検証するための領域以外の領域に分布されている導電性ステンレスファイバが無駄となってしまう。また、このような媒体は特殊な構成であるため、専用の生産設備が必要となり、コスト高になりやすい。さらに、媒体が磁気カードである場合には、その磁気特性に影響を及ぼして磁気記録の読取りに支障を来たす恐れがある。 However, in this authenticity verification method using microwaves, conductive stainless steel fibers are distributed over the entire information recording medium (for example, a plastic card), and the authenticity is verified by irradiating microwaves. Therefore, the conductive stainless fiber distributed in the region other than the region to be used is wasted. Moreover, since such a medium has a special configuration, a dedicated production facility is required, which tends to increase costs. Further, when the medium is a magnetic card, there is a possibility that the magnetic characteristics will be affected and the reading of the magnetic recording may be hindered.
また、特許文献２には、粒径の異なる磁性粒子と非磁性粒子を樹脂中に分散した磁性インキで所定の印刷を施して真偽検証用の磁気情報部を設けるようにした方法が開示されている。これは、磁性インキ中の磁性粒子と非磁性粒子の粒径が異なることで、磁性インキからなる磁気情報部内で磁性粒子の偏在が生じ、結果として磁気情報部内に真偽検証用の磁気ランダムパターンが得られるようにした方法である。 Patent Document 2 discloses a method of providing a magnetic information part for authenticity verification by performing predetermined printing with magnetic ink in which magnetic particles and nonmagnetic particles having different particle diameters are dispersed in a resin. ing. This is because the magnetic particles in the magnetic ink are different in particle size from the non-magnetic particles, and magnetic particles are unevenly distributed in the magnetic information portion made of magnetic ink. As a result, a magnetic random pattern for verifying authenticity in the magnetic information portion This is a method that can be obtained.
しかし、磁性粒子は一般的には茶褐色もしくは黒褐色であって、情報記録媒体中の他の文字や画像と違和感なく混在させることが難しい。文字や画像と磁気情報部とを違和感なく混在させるためには、両者を完全にエリア分けして設けるようにするか、両者が区別できないように隠蔽層を設ける必要がある。エリア分けを行えば、磁気情報部から得られる情報量が低下し、その読取りに支障を来たすことがある。一方、磁性インキ中の磁性粒子の全体量は、非磁性粒子との混在により磁性粒子単独の場合よりも低下するため、隠蔽層を設けた場合には磁気情報の読取性がさらに低下してしまうことになる。 However, the magnetic particles are generally brownish brown or blackish brown, and are difficult to mix with other characters and images in the information recording medium without a sense of incongruity. In order to mix characters and images with the magnetic information part without a sense of incongruity, it is necessary to provide them in completely divided areas or to provide a concealing layer so that they cannot be distinguished from each other. If the area is divided, the amount of information obtained from the magnetic information unit is reduced, which may hinder reading. On the other hand, the total amount of magnetic particles in the magnetic ink is lower than the case of magnetic particles alone due to the mixture with non-magnetic particles, so that when a concealing layer is provided, the readability of magnetic information is further reduced. It will be.
本発明は、前述したステンレスファイバを用いた情報記録媒体における生産性の悪さや磁気情報への悪影響、あるいは、前述した磁気粒子と非磁性粒子を分散させた磁性インキ
を用いて得られる磁気ランダムパターと他の非真偽検証用の画像情報とを混在させることの難しさや情報読取性の低下等の問題点を解決し、高い生産性を持つと共に、磁気情報に悪影響を及ぼすこともなく、しかも他の非真偽検証用の画像情報との混在が容易で、かつ情報読取性に優れる固有記録情報を有する情報記録媒体と、その製造方法および情報読取方法の提供を課題とする。
The present invention provides a magnetic random pattern obtained by using the magnetic ink in which the aforementioned magnetic particles and nonmagnetic particles are dispersed, or inferior productivity and adverse effect on magnetic information in the information recording medium using the stainless steel fiber. Solves problems such as difficulty in mixing non-authentication image information and reduced information readability, has high productivity, and does not adversely affect magnetic information. It is an object of the present invention to provide an information recording medium having unique recording information that can be easily mixed with other image information for non-authentication verification and excellent in information readability, a manufacturing method thereof, and an information reading method.
以上のような課題を解決すべくなされ、請求項１記載の発明は、配向処理が施されていない基材の上に、ネマチック液晶及びカイラル剤を主成分とするカイラルネマチック液晶組成物からなり、固有記録情報を有する固有情報記録層が少なくとも設けられていることを特徴とする情報記録媒体である。 In order to solve the above problems, the invention according to claim 1 comprises a chiral nematic liquid crystal composition mainly comprising a nematic liquid crystal and a chiral agent on a substrate that has not been subjected to an alignment treatment. An information recording medium comprising at least a unique information recording layer having unique record information.
また、請求項２記載の発明は、請求項１記載の情報記録媒体において、前記カイラルネマチック液晶組成物が左円偏光性または右円偏光性を示すものであることを特徴とする。 The invention according to claim 2 is the information recording medium according to claim 1, wherein the chiral nematic liquid crystal composition exhibits left circular polarization or right circular polarization.
さらにまた、請求項３記載の発明は、請求項１または２記載の情報記録媒体において、前記基材上には、非円偏光性の画像層がさらに設けられていることを特徴とする。 Furthermore, the invention according to claim 3 is the information recording medium according to claim 1 or 2, wherein a non-circularly polarizing image layer is further provided on the substrate.
さらにまた、請求項４記載の発明は、配向処理が施されていない基材の上に、ネマチック液晶及びカイラル剤を主成分とするカイラルネマチック液晶組成物からなる薄膜を塗工し、しかる後にその薄膜中の液晶分子が配向する前に薄膜を固化し、固有記録情報を有する固有情報記録層を基材上に形成することを特徴とする情報記録媒体の製造方法である。 Furthermore, in the invention described in claim 4, a thin film made of a chiral nematic liquid crystal composition mainly composed of a nematic liquid crystal and a chiral agent is applied onto a substrate that has not been subjected to an alignment treatment, and thereafter A method for producing an information recording medium, comprising: solidifying a thin film before liquid crystal molecules in the thin film are aligned and forming a unique information recording layer having unique record information on a substrate.
さらにまた、請求項５記載の発明は、配向処理が施されていない基材の上に、ネマチック液晶及びカイラル剤を主成分とするカイラルネマチック液晶組成物からなる固有情報記録層が少なくとも設けられている情報記録媒体に対して照射した後に反射してくる光を、右円偏光板と左円偏光板のそれぞれを介して読み取った後、それぞれの読取り情報の差分を算出することで固有情報記録層中の固有記録情報を読取ることを特徴とする情報記録媒体の情報読取方法である。 Furthermore, in the invention described in claim 5, at least a specific information recording layer comprising a nematic liquid crystal composition mainly composed of a nematic liquid crystal and a chiral agent is provided on a substrate that has not been subjected to an alignment treatment. After reading the reflected light after irradiating the information recording medium through the right circularly polarizing plate and the left circularly polarizing plate, the unique information recording layer is calculated by calculating the difference between the respective read information An information reading method for an information recording medium, characterized in that the unique recording information is read.
本発明によれば、高い生産性を持つと共に、磁気情報に悪影響を及ぼすこともなく、他の非真偽検証用の画像情報との混在が容易で、情報読取性に優れる真偽検証用の固有記録情報が記録されている情報記録媒体と、その製造方法および情報読取方法の提供が可能である。 According to the present invention, it has high productivity, does not adversely affect magnetic information, can be easily mixed with other non-authentication image information, and has excellent information readability. It is possible to provide an information recording medium on which unique recording information is recorded, a manufacturing method thereof, and an information reading method.
以下、図面を参照にして本発明を詳細に説明する。
本発明の情報記録媒体は、図１にも示すように、配向処理が施されていない基材２の上に、ネマチック液晶及びカイラル剤を主成分とするカイラルネマチック液晶組成物からなり、固有記録情報を有する固有情報記録層３が少なくとも設けられてなるものである。
Hereinafter, the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the information recording medium of the present invention comprises a chiral nematic liquid crystal composition mainly composed of a nematic liquid crystal and a chiral agent on a substrate 2 that has not been subjected to an alignment treatment. The unique information recording layer 3 having information is provided at least.
基材２は、固有情報記録層３を設けるための土台となるものであり、一般的にはハンド
リングのよいプラスチックフィルムを用いればよいが、必ずしもこれに限るものではない。より具体的には、ポチエチレンテレフタレートフィルム（ＰＥＴフィルム）、ナイロンフィルム、ポリエチレンフィルム、ポリプロピレンフィルム等のプラスチックフィルムを挙げることができる。これらの中から、価格や強度、入手性、加工性等を考慮し、適宜のものを選択して用いればよい。これらのプラスチックフィルム以外に、ガラス板や、金属フィルム等を用いることも可能である。
The base material 2 serves as a base for providing the unique information recording layer 3, and generally a plastic film with good handling may be used, but is not necessarily limited thereto. More specifically, a plastic film such as a polyethylene terephthalate film (PET film), a nylon film, a polyethylene film, or a polypropylene film can be used. Of these, an appropriate one may be selected and used in consideration of price, strength, availability, workability, and the like. In addition to these plastic films, glass plates, metal films, and the like can be used.
固有情報記録層３は本発明の中心となるもので、この層に固有の固有記録情報が記録されている。この固有情報記録層３はネマチック液晶材料とカイラル剤を主成分とするカイラルネマチック液晶組成物からなる層である。 The unique information recording layer 3 is the center of the present invention, and unique record information unique to this layer is recorded. The unique information recording layer 3 is a layer made of a chiral nematic liquid crystal composition mainly composed of a nematic liquid crystal material and a chiral agent.
ネマチック液晶とは、ネマチック状態をとる液晶材料のことであって、細長い液晶分子がその一番長い方向を１方向に揃えて並んでいる。このネマチック液晶の分子内には、細長くて変形しにくい主要骨格部分、細長くて変形しやすい末端基部分および極性基部分がある。液晶分子が１方向に揃うのは、この極性基が分子間力を強めているためである。 A nematic liquid crystal is a liquid crystal material that takes a nematic state, and elongated liquid crystal molecules are aligned with the longest direction aligned in one direction. In the nematic liquid crystal molecule, there are a main skeleton portion that is elongated and hardly deformed, an end group portion that is elongated and easily deformed, and a polar group portion. The reason why the liquid crystal molecules are aligned in one direction is that this polar group enhances the intermolecular force.
また、ネマチック液晶中の液晶分子は極性基を有しているため、分子内で分極しやすいという性質がある。そして、光（＝電磁波）の電解ベクトルがこの液晶分子の長軸方向に平行になったときに最も分極が大きくなり、高い屈折率を示すようになる。一方、それ以外の場合では、それより低い屈折率を示すようになる。したがって、液晶分子の長軸方向の向きによって光学的性質が異なる、いわゆる光学異方性を示すことになる。 Further, since the liquid crystal molecules in the nematic liquid crystal have a polar group, they have a property that they are easily polarized in the molecule. Then, when the electrolysis vector of light (= electromagnetic wave) is parallel to the major axis direction of the liquid crystal molecules, the polarization becomes the largest and exhibits a high refractive index. On the other hand, in other cases, the refractive index is lower than that. Therefore, so-called optical anisotropy, which shows different optical properties depending on the direction of the major axis direction of the liquid crystal molecules, is exhibited.
通常、液晶材料を例えばディスプレイの用途に使用する場合には、液晶材料とカイラル剤を主成分として混合してなる混合液を、配向膜の上に塗工する。配向膜は、例えば、ポリイミド樹脂製の薄膜にラビングと呼ばれる一定方向の配向スジをつける操作を行って得られるものである。この配向膜上に液晶材料を塗工すると、配向膜についた配向スジに沿ってまず１層目の液晶分子が並ぶ。そして、この上に液晶分子が順次重なっていくので、液晶分子はその長軸方向を配向膜の配向スジに方向を揃えて同じ方向に並ぼうとする。しかし、混合液中に存在するカイラル剤との分子間相互作用により、２層目の液晶分子はその長軸方向を配向膜の配向スジとわずかに角度を違えて積み重なることになる。３層目以降の液晶分子もさらに角度を変えて積み重なっていくので、結果として螺旋構造が出来上がる。この螺旋構造をコレステリック状態と呼ぶ。 Usually, when a liquid crystal material is used for, for example, a display, a liquid mixture obtained by mixing a liquid crystal material and a chiral agent as main components is applied onto the alignment film. The alignment film is obtained, for example, by performing an operation of attaching alignment stripes in a certain direction called rubbing to a thin film made of polyimide resin. When a liquid crystal material is applied onto the alignment film, first liquid crystal molecules are aligned along the alignment stripes on the alignment film. Then, since liquid crystal molecules sequentially overlap with each other, the liquid crystal molecules try to align the major axis direction in the same direction with the alignment line of the alignment film aligned. However, due to intermolecular interaction with the chiral agent present in the liquid mixture, the liquid crystal molecules in the second layer are stacked with their major axis direction slightly different from the alignment stripes of the alignment film. The liquid crystal molecules in the third and subsequent layers are also stacked at different angles, resulting in a spiral structure. This helical structure is called a cholesteric state.
コレステリック状態の液晶は、上述のように光学異方性を持つ液晶分子が螺旋構造をとっているため、進入してきた光はそのまま直進できずに螺旋に沿って進むこととなり、偏光面が回転する円偏光を示すようになる。そして、コレステリック状態の液晶の螺旋構造が一回転するまでの長さ（＝ピッチ）と同じ波長の光を反射し、他は透過することになる。例えば、ピッチが６５０ｎｍ付近であれば赤色のみを反射して赤く見え、５００ｎｍ付近であれば緑色に見えるようになる。通常、ディスプレイ用途等に使用する場合には、このピッチを厳密にコントロールし、ＲＧＢの三原色を効率よく反射するように液晶層を作成し、これを重ねて構成することで、カラー画像を得ている。反射されてきた光は、前記のように円偏光である。 In the cholesteric liquid crystal, since the liquid crystal molecules having optical anisotropy have a spiral structure as described above, the light that has entered cannot travel straight but travels along the spiral, and the plane of polarization rotates. Shows circularly polarized light. Then, light having the same wavelength as the length (= pitch) until the spiral structure of the cholesteric liquid crystal rotates once is reflected, and the other is transmitted. For example, if the pitch is around 650 nm, only red is reflected and looks red, and if it is around 500 nm, it looks green. Normally, when used for display applications, etc., this pitch is strictly controlled, a liquid crystal layer is created so as to efficiently reflect the three primary colors of RGB, and a color image is obtained by superimposing these layers. Yes. The reflected light is circularly polarized light as described above.
ところが、上記した配向膜ではなく、配向処理が施されていない基材上に同じように液晶層を設けようとすると、１層目の液晶分子は落ち着く方向がないので、液晶分子の長軸方向が様々な方向を向くことになる。そして、長軸方向がランダムな状態で１層目の液晶分子が並んだ上に２層目以降の液晶分子が重なっていくので、全体として規則性がなく、液晶分子の長軸方向がバラバラの状態の液晶層が形成されることになる。そして、この液晶層を固化すると、螺旋構造のピッチが一定しない状態となるので、部分的に異なった色相を呈することになる。この色相表現の違いは、各液晶層の固化条件の微妙な違いにより
生じるので、個々の液晶層において異なり、他の液晶層においても同じ色相模様（固有記録情報）を作ることは困難である。本発明では、このような固有記録情報を固有情報記録層３、２３中に内在させ、それを真偽検証のための情報として利用する（図１、図４参照）。
However, if an attempt is made to provide a liquid crystal layer in the same manner on a substrate that has not been subjected to an alignment treatment instead of the alignment film described above, the liquid crystal molecules in the first layer have no direction to settle, so the major axis direction of the liquid crystal molecules Will face in various directions. And since the liquid crystal molecules in the second and subsequent layers overlap with each other with the liquid crystal molecules in the first layer arranged in a state where the major axis direction is random, there is no regularity as a whole, and the major axis direction of the liquid crystal molecules varies. A liquid crystal layer in a state is formed. When the liquid crystal layer is solidified, the pitch of the spiral structure is not constant, so that a partially different hue is exhibited. This difference in hue expression is caused by a subtle difference in the solidification conditions of each liquid crystal layer, so that it is different in each liquid crystal layer, and it is difficult to make the same hue pattern (unique recording information) in other liquid crystal layers. In the present invention, such unique recording information is included in the unique information recording layers 3 and 23 and used as information for authenticity verification (see FIGS. 1 and 4).
この固有記録情報は個々の個別情報記録層３、２３において異なっているが、いずれも円偏光性を示す。したがって、例えば、この固有情報記録層３、２３で反射してくる光が右円偏光の場合、右円偏光板を介して観察すれば固有情報記録層３、２３中に内在していた固有記録情報が見られるようになるが、逆の左円偏光板を介して観察すると反射光が透過できず固有情報記録層３、２３の固有記録情報は見ることができなくなる。また、反射光が左回転の円偏光の場合は、逆に左円偏光板のみで固有記録情報が観察できる。 This unique recording information differs in each individual information recording layer 3, 23, but both exhibit circular polarization. Therefore, for example, when the light reflected by the unique information recording layers 3 and 23 is right circularly polarized light, the inherent recording inherent in the unique information recording layers 3 and 23 is observed through the right circularly polarizing plate. Information can be seen, but when viewed through the reverse left circularly polarizing plate, the reflected light cannot be transmitted and the unique recorded information of the unique information recording layers 3 and 23 cannot be seen. On the other hand, when the reflected light is counterclockwise circularly polarized light, the inherent recording information can be observed only with the left circularly polarizing plate.
一方、図４に示すように、情報記録媒体の構成が固有情報記録層２３の下に文字や絵柄等の非円偏光性の画像２５を有する画像層２４を有するものである場合は、この画像層２４は特定の偏光状態ではないため、左右どちらの円偏光板でも同様に観察されて差異は生じない。 On the other hand, as shown in FIG. 4, when the configuration of the information recording medium has an image layer 24 having a non-circularly polarized image 25 such as letters and pictures under the unique information recording layer 23, this image Since the layer 24 is not in a specific polarization state, it is observed in the same way in both the left and right circularly polarizing plates, and no difference occurs.
したがって、固有記録情報を左円偏光板と左円偏光板のそれぞれを介して観察して得られたそれぞれの画像情報の差分を取れば、固有情報記録層中の液晶分子（成分）が表す固有記録情報が検証できることとなる。より具体的には、図２に示すように、情報記録装置６の前に円偏光板４を配置し、検証用光源５から照射されて情報記録媒体１で反射してきた光を撮像素子等の画像記録装置６で観察し、その記録情報を画像処理装置７で処理することにより、検証が行えるようになる。 Therefore, if the difference between the respective image information obtained by observing the inherent recording information through the left circularly polarizing plate and the left circularly polarizing plate is taken, the inherent characteristic represented by the liquid crystal molecules (components) in the inherent information recording layer The recorded information can be verified. More specifically, as shown in FIG. 2, a circularly polarizing plate 4 is disposed in front of the information recording device 6, and the light irradiated from the verification light source 5 and reflected by the information recording medium 1 is captured by an image sensor or the like. By observing with the image recording device 6 and processing the recorded information with the image processing device 7, verification can be performed.
この時、固有情報記録層２が左円偏光性を示す場合、図３の左円偏光板による観察情報８と右円偏光板を介して得られた観察情報９に係る図面のそれぞれに示すように、左円偏光板を使用した場合には固有情報記録層中の固有記録情報１０と下層の非円偏光性の画像１１とが観察され、右円偏光板を使用した場合には非円偏光性の画像１１のみが観察されることとなる。そしてこれらの読取り情報から算出される差分情報１２には、両者で共通の非円偏光性の画像１１は読取られず、固有記録情報１０のみが読取れることになる。 At this time, when the unique information recording layer 2 exhibits left circular polarization, the observation information 8 by the left circular polarizing plate and the drawing relating to the observation information 9 obtained through the right circular polarizing plate in FIG. In addition, when the left circularly polarizing plate is used, the inherent recording information 10 in the inherent information recording layer and the non-circularly polarized image 11 in the lower layer are observed, and when the right circularly polarizing plate is used, the noncircularly polarized light is observed. Only the sex image 11 is observed. In the difference information 12 calculated from these read information, the non-circularly polarized image 11 common to both is not read, and only the unique record information 10 is read.
このような情報記録媒体は、配向処理が施されていない基材の上に、ネマチック液晶及びカイラル剤を主成分とするカイラルネマチック液晶組成物からなる薄膜を塗工し、しかる後にその薄膜中の液晶分子が配向する前に薄膜を固化し、固有記録情報を有する固有情報記録層を基材上に設けるようにすればよい。 In such an information recording medium, a thin film composed of a nematic liquid crystal composition mainly composed of a nematic liquid crystal and a chiral agent is coated on a substrate that has not been subjected to an alignment treatment, and then the thin film in the thin film The thin film may be solidified before the liquid crystal molecules are aligned, and a unique information recording layer having unique record information may be provided on the substrate.
カイラルネマチック液晶組成物からなる薄膜の塗工は、グラビア法、マイクログラビア法、リバースグラビア法、ロールコート法、カーテンコート法、コンマコート法、ナイフコート法等の一般的な薄膜形成方法により行えばよい。また、その塗工膜厚は、加工性等を考慮して、０．１〜１０μｍ、好ましくは０．５〜５μｍ程度とすればよい。 Coating of a thin film comprising a chiral nematic liquid crystal composition can be performed by a general thin film forming method such as a gravure method, a micro gravure method, a reverse gravure method, a roll coating method, a curtain coating method, a comma coating method, or a knife coating method. Good. Moreover, the coating film thickness should just be about 0.1-10 micrometers, preferably about 0.5-5 micrometers considering workability etc.
基材として、厚みが２５μｍの透明ＰＥＴフィルム（２５Ｔ６０；東レ社製）を用い、この上にグラビア法にて下記組成のカイラルネナチック液晶組成物からなる薄膜を塗工した。 A transparent PET film (25T60; manufactured by Toray Industries, Inc.) having a thickness of 25 μm was used as a substrate, and a thin film made of a chiral nematic liquid crystal composition having the following composition was applied thereon by a gravure method.
＜カイラルネナチック液晶組成物＞
ネマチック液晶 Ｐａｌｉｏｃｏｌｏｒ ＬＣ２４２（ＢＡＳＦ社製） ５０重量部
カイラル剤 Ｐａｌｉｏｃｏｌｏｒ ＬＣ７５６（ＢＡＳＦ社製） ５重量部
ＵＶ重合開始剤 Ｉｒｇａｃｕｒｅ ３６９（チバスペシャリティケミカル社製）
３重量部
メチルエチルケトン ４２重量部
<Chiral Nenatic Liquid Crystal Composition>
Nematic liquid crystal Paliocolor LC242 (manufactured by BASF) 50 parts by weight chiral agent Paliocolor LC756 (manufactured by BASF) 5 parts by weight UV polymerization initiator Irgacure 369 (manufactured by Ciba Specialty Chemicals)
3 parts by weight methyl ethyl ketone 42 parts by weight
次に、得られた塗工物を１００℃のオーブン中に入れ、溶媒であるメチルエチルケトンを蒸発させ、続いて紫外線硬化装置にて高圧水銀灯（２４０Ｗ）から紫外線を照射させて薄膜を硬化させ、本発明の情報記録媒体１を得た。 Next, the obtained coated material is put in an oven at 100 ° C. to evaporate methyl ethyl ketone, which is a solvent, and subsequently irradiated with ultraviolet rays from a high pressure mercury lamp (240 W) in an ultraviolet curing device to cure the thin film. An information recording medium 1 of the invention was obtained.
続いて、この情報記録媒体１の上に通常のプロセス印刷インキを用いて非円偏光性の画像を印刷して本発明に係る情報記録媒体２を得た。そして、得られた情報記録媒体２を通常の蛍光灯の下で左円偏光板を介して市販のデジタルカメラにより撮影した。撮影画像には情報記録媒体２の固有情報記録層中の固有記録情報に係るランダムな模様が記録されていた。次に、同じ部分を右円偏光板を介して同じデジタルカメラで撮影したところ、固有情報記録層中の固有記録情報に係るランダムな模様は記録されていなかった。そして、両者の撮影画像情報の差分を画像処理ソフト（フリーソフト；ｇＤｉｆｆ．ｅｘｅ）で得たところ、ほぼ固有記録情報のみを抽出することができた。この抽出情報を元に、特徴点の抽出を行うことで、固有記録情報の読出しにつなげることが可能であることが示された。 Subsequently, an information recording medium 2 according to the present invention was obtained by printing a non-circularly polarized image on the information recording medium 1 using a normal process printing ink. The obtained information recording medium 2 was photographed with a commercially available digital camera through a left circularly polarizing plate under a normal fluorescent lamp. A random pattern related to the unique recording information in the unique information recording layer of the information recording medium 2 was recorded on the photographed image. Next, when the same portion was photographed with the same digital camera through the right circularly polarizing plate, a random pattern related to the unique recording information in the unique information recording layer was not recorded. Then, when the difference between the two pieces of captured image information was obtained by image processing software (free software; gDiff.exe), only the inherent recording information could be extracted. It has been shown that by extracting feature points based on this extracted information, it is possible to lead to the reading of unique recorded information.
１…情報記録媒体
２…基材
３…固有情報記録層
４…円偏光板
５…検証用光源
６…情報読取装置
７…情報処理装置
８…左円偏光板を介して得られた観察情報
９…右円偏光板を介して得られた観察情報
１０…固有記録情報
１１…非円偏光性の画像
１２…差分情報
DESCRIPTION OF SYMBOLS 1 ... Information recording medium 2 ... Base material 3 ... Specific information recording layer 4 ... Circular polarizing plate 5 ... Light source 6 for verification ... Information reading device 7 ... Information processing device 8 ... Observation information 9 obtained via the left circular polarizing plate ... Observation information 10 obtained through the right circularly polarizing plate ... Specific recording information 11 ... Non-circularly polarized image 12 ... Difference information
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| WO2016002765A1 (en) * | 2014-06-30 | 2016-01-07 | 日本ゼオン株式会社 | Identification medium, method for producing identification medium, and method for using identification medium |
| JP2017072928A (en) * | 2015-10-06 | 2017-04-13 | 日本電気株式会社 | Illegal change determination device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2016002765A1 (en) * | 2014-06-30 | 2016-01-07 | 日本ゼオン株式会社 | Identification medium, method for producing identification medium, and method for using identification medium |
| JP2017072928A (en) * | 2015-10-06 | 2017-04-13 | 日本電気株式会社 | Illegal change determination device |
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