JP5310983B2 - Anti-counterfeit medium having flexibility and its verification method - Google Patents
Anti-counterfeit medium having flexibility and its verification method Download PDFInfo
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- JP5310983B2 JP5310983B2 JP2007313176A JP2007313176A JP5310983B2 JP 5310983 B2 JP5310983 B2 JP 5310983B2 JP 2007313176 A JP2007313176 A JP 2007313176A JP 2007313176 A JP2007313176 A JP 2007313176A JP 5310983 B2 JP5310983 B2 JP 5310983B2
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- 230000010287 polarization Effects 0.000 claims description 20
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/378—Special inks
- B42D25/391—Special inks absorbing or reflecting polarised light
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/351—Translucent or partly translucent parts, e.g. windows
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
- G02B5/305—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks including organic materials, e.g. polymeric layers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/003—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using security elements
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
- G07D7/12—Visible light, infrared or ultraviolet radiation
- G07D7/1205—Testing spectral properties
-
- G—PHYSICS
- G07—CHECKING-DEVICES
- G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
- G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
- G07D7/20—Testing patterns thereon
- G07D7/202—Testing patterns thereon using pattern matching
- G07D7/207—Matching patterns that are created by the interaction of two or more layers, e.g. moiré patterns
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Computer Security & Cryptography (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Polarising Elements (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Credit Cards Or The Like (AREA)
Abstract
Description
本発明は、物品の偽造防止及び真贋判定を行うための隠し文字や隠しパターンを、フィルタを用いることによって表示させることを目的とした潜像を用いた偽造防止用媒体に関するものであり、さらに詳しくは、潜像デバイスと検証デバイスとを同一面上に配置した可とう性を有する偽造防止用媒体及びその検証方法に関するものである。 The present invention relates to an anti-counterfeit medium using a latent image for the purpose of displaying hidden characters and hidden patterns for performing anti-counterfeiting and authenticity determination of articles by using a filter. Relates to an anti-counterfeit medium having flexibility, in which a latent image device and a verification device are arranged on the same surface, and a verification method thereof.
従来、銀行券、商品券、パスポートなどの有価証券や認証媒体は、偽造防止対策として偽造の困難な媒体の貼付を行ってきた。そこでは、目視による判定(オバート機能)または検証器を用いた判定(コバート機能)により真贋判定を行っている。 Conventionally, securities such as banknotes, gift certificates, passports, and authentication media have been pasted with a medium that is difficult to forge as a countermeasure against forgery. In this case, authenticity determination is performed by visual determination (overt function) or determination using a verifier (covert function).
しかし、目視により真贋判定が行える偽造防止用媒体は偽造されやすい。そこで、近年、偏光技術を用いた潜像技術が提案され、偏光フィルムを重ねることにより潜像を出現させ真贋判定を行っている。 However, a medium for preventing forgery that can be visually checked for authenticity is easily forged. Therefore, in recent years, a latent image technique using a polarization technique has been proposed, and a latent image appears by overlapping a polarizing film to determine authenticity.
しかし、潜像デバイスの真贋判定には、偏光フィルム等の専用の検証器が必要になる。通常、小売業者もしくはサービス業者は消費者から受け取る金券やチケットを想定して、真贋判定用の検証器を準備し真贋判定を行うことは出来る。しかし、一般消費者はこれらの状況を想定して事前に検証器を入手しているとは考えにくく、真贋判定を行うことが出来ない。 However, in order to determine the authenticity of the latent image device, a dedicated verifier such as a polarizing film is required. Usually, a retailer or a service provider can prepare a verifier for authenticity determination and perform authenticity determination assuming a voucher or ticket received from a consumer. However, it is unlikely that a general consumer has obtained a verifier in advance assuming these situations, and authentication cannot be made.
そこで、この問題を解決するために、検証器と潜像デバイスが一体となった媒体の提案がある（例えば、特許文献１参照。）。 In order to solve this problem, there is a proposal of a medium in which a verifier and a latent image device are integrated (see, for example, Patent Document 1).
しかしながら、この提案のように、検証器を９０°旋回させるとポジの画像がネガで表されるとあるが、検証器と潜像デバイスが一体となった媒体では検証器を９０°旋回させにくく画像が反転するのを確認しづらい。 However, as in this proposal, when the verifier is rotated 90 °, a positive image is expressed as a negative, but it is difficult to rotate the verifier 90 ° in a medium in which the verifier and the latent image device are integrated. It is difficult to confirm that the image is reversed.
以下に先行技術文献を示す。
本発明は、このような従来技術の問題点を解決しようとするものであり、物品の偽造防止及び真贋判定が容易に行える可とう性を有する偽造防止用媒体及びその検証方法を提供することを目的とする。 The present invention is intended to solve such problems of the prior art, and provides a forgery prevention medium having a flexibility that can easily prevent counterfeiting of articles and determine authenticity, and a method for verifying the same. Objective.
本発明は、上記の課題を解決するために成されたものであり、本発明の請求項１に係る発明は、可とう性を有する支持体（１１）に、該支持体（１１）の同一面内もしくは異なる面に潜像デバイス（１２）および検証デバイス（１３）を具備しており、該支持体（１１）を変形させ潜像デバイス（１２）に対して検証デバイス（１３）を合わせたときに支持体（１１）の同一の面が向き合う場合と異なる面が向き合う場合とで、異なる画像が出現する潜像デバイス（１２）および検証デバイス（１３）を具備した可とう性を有する偽造防止用媒体であり、前記潜像デバイス（１２）が右円偏光性を有する領域と左円偏光性を有する領域との２つの領域を持っており、前記検証デバイス（１３）が片方の面からは右円偏光子として機能し、もう片方の面からは左円偏光子として機能する可とう性を有する偽造防止用媒体である。 The present invention has been made to solve the above problems, and the invention according to claim 1 of the present invention is the same as the support (11) having the flexibility. A latent image device (12) and a verification device (13) are provided in the plane or in different planes, and the support (11) is deformed to align the verification device (13) with the latent image device (12). Sometimes the counterfeit prevention device having the latent image device (12) and the verification device (13) in which different images appear depending on whether the same surface of the support (11) faces or a different surface faces each other. a use medium, before Kisenzo device (12) has two regions of a region having an area and left circular polarization having the right circular polarization, the verification device (13) from one side Functions as a right circular polarizer and is already In terms of rectangular are anti-counterfeit medium having flexibility which functions as a left circularly photons.
本発明の請求項２に係る発明は、可とう性を有する支持体（１１）に、該支持体（１１）の同一面内もしくは異なる面に潜像デバイス（１２）および検証デバイス（１３）を具備しており、該支持体（１１）を変形させ潜像デバイス（１２）に対して検証デバイス（１３）を合わせたときに支持体（１１）の同一の面が向き合う場合と異なる面が向き合う場合とで、異なる画像が出現する潜像デバイス（１２）および検証デバイス（１３）を具備した可とう性を有する偽造防止用媒体であり、請求項１又は２記載の可とう性を有する偽造防止用媒体において、前記潜像デバイス（１２）が複数の光軸を持っており、前記検証デバイス（１３）が直線偏光子に位相差子を両側に具備したデバイスであるときに、同一の面が向き合う場合に、潜像デバイス（１２）のある１つの光軸と検証デバイス（１３）のいずれかの面の位相差子の光軸とが一致し、異なる面が向き合う場合に、潜像デバイス（１２）の他の光軸と検証デバイス（１３）のもう片方の面の位相差子の光軸とが一致するように潜像デバイス（１２）および検証デバイス（１３）を配置した可とう性を有する偽造防止用媒体である。 According to the second aspect of the present invention , a latent image device (12) and a verification device (13) are provided on a flexible support (11) on the same surface or different surfaces of the support (11). And when the support (11) is deformed and the verification device (13) is aligned with the latent image device (12), the same surface of the support (11) faces differently. An anti-counterfeit medium having flexibility according to claim 1 or 2 , wherein the medium is a flexible anti-counterfeit medium having a latent image device (12) and a verification device (13) in which different images appear. In the medium for use, when the latent image device (12) has a plurality of optical axes and the verification device (13) is a device having a linear polarizer and phase retarders on both sides, the same surface Latent images when facing each other When one optical axis of the vice (12) coincides with the optical axis of the phase retarder on either side of the verification device (13) and the different surfaces face each other, the other light of the latent image device (12) An anti-counterfeit medium having flexibility in which the latent image device (12) and the verification device (13) are arranged so that the axis and the optical axis of the phase retarder on the other side of the verification device (13) coincide with each other. is there.
本発明の請求項３に係る発明は、前記請求項１または２のいずれか１項記載の長方形の可とう性を有する偽造防止用媒体の長軸側を変形させ同一の面が向き合うようにした場合に出現する画像と、長軸側を変形させ異なる面が向き合うようにした場合に同一の面が向き合うようにした場合とは異なる画像を出現させて真贋判定を行う検証方法である。
In the invention according to claim 3 of the present invention, the long axis side of the rectangular anti-counterfeit medium having flexibility according to claim 1 or 2 is deformed so that the same surface faces each other. This is a verification method in which an authenticity determination is performed by causing an image that appears different from the case where the same surface faces when an image appearing in the case and the long surface side are deformed to face each other to face each other.
本発明に係る可とう性を有する偽造防止用媒体は、可とう性を有する支持体に、該支持体の同一面内もしくは異なる面に潜像デバイスおよび検証デバイスを具備しており、該支持体を変形させ潜像デバイスに対して検証デバイスを合わせたときに支持体の同一の面が向き合う場合と異なる面が向き合う場合とで、異なる画像が出現する潜像デバイスおよび検証デバイスを具備したことにより、特別な検証器を使用せずに媒体のみで物品の真贋判定が正確に容易に行える。 The medium for preventing forgery having flexibility according to the present invention comprises a support having flexibility and a latent image device and a verification device on the same surface or different surfaces of the support, and the support. When the verification device is deformed and the verification device is aligned with the latent image device, the latent image device and the verification device in which different images appear depending on whether the same surface of the support faces or a different surface faces Therefore, it is possible to accurately and easily determine the authenticity of an article using only a medium without using a special verifier.
本発明の実施の形態を図１〜図７に基づいて詳細に説明するが、特にこれに制約されるものではない。 The embodiment of the present invention will be described in detail with reference to FIGS. 1 to 7, but is not particularly limited thereto.
図１は本発明に係る可とう性を有する偽造防止用媒体の１実施例を示し、（ａ）は平面図であり、（ｂ）は側断面図であり、図２は本発明に係る可とう性を有する偽造防止用媒体の潜像デバイスに対して検証デバイスを合わせたときに支持体の同一面が向き合うように支持体を変形させた状態を示す側断面図であり、図３は本発明に係る可とう性を有する偽造防止用媒体の潜像デバイスに対して検証デバイスを合わせたときに支持体の異なる面で向き合うように支持体を変形させた状態を示す側断面図であり、図４は本発明に係る可とう性を有する偽造防止用媒体のその他の実施例を示し、（ａ）は平面図であり、（ｂ）
は側断面図であり、図５は本発明に係る可とう性を有する偽造防止用媒体のまたその他の実施例を示し、（ａ）は平面図であり、（ｂ）は側断面図であり、図６は図５に示す媒体を図２のように変形させ、検証デバイスを潜像デバイスに重ねた時に出現した画像の１実施例を示す平面図であり、図７は図５に示す媒体を図３のように変形させ、検証デバイスを潜像デバイスに重ねた時に出現した画像の１実施例を示す平面図である。
FIG. 1 shows one embodiment of a flexible anti-counterfeit medium according to the present invention, (a) is a plan view, (b) is a side sectional view, and FIG. FIG. 3 is a side sectional view showing a state in which the support is deformed so that the same surface of the support faces when the verification device is aligned with the latent image device of the anti-counterfeit medium having flexibility. It is a side sectional view showing a state in which the support is deformed so as to face each other on a different surface of the support when the verification device is matched with the latent image device of the anti-counterfeit medium having flexibility according to the invention, FIG. 4 shows another embodiment of the flexible anti-counterfeit medium according to the present invention, (a) is a plan view, (b)
FIG. 5 is a sectional side view, FIG. 5 shows still another embodiment of the flexible anti-counterfeit medium according to the present invention, (a) is a plan view, and (b) is a side sectional view. 6 is a plan view showing an example of an image that appears when the medium shown in FIG. 5 is deformed as shown in FIG. 2 and the verification device is superimposed on the latent image device. FIG. 7 is a plan view showing the medium shown in FIG. FIG. 4 is a plan view showing an example of an image that appears when the verification device is deformed as shown in FIG. 3 and the verification device is superimposed on the latent image device.
本発明の１実施例の可とう性を有する偽造防止用媒体は、図１に示すように、可とう性を有する支持体（１１）に、該支持体（１１）の同一面内もしくは異なる面に潜像デバイス（１２）を設け、さらに支持体（１１）に光透過部（１４）を設け、その光透過部（１４）上に検証デバイス（１３）を具備しており、図２に示すように、該支持体（１１）を変形させ潜像デバイス（１２）に対して検証デバイス（１３）を合わせたときに、支持体（１１）の同一の面が向き合う場合と、図３に示すように、異なる面が向き合う場合とで、異なる画像が出現する潜像デバイス（１２）および検証デバイス（１３）を具備した可とう性を有する偽造防止用媒体である。また、前記異なる画像がネガとポジとの関係に設計されていることが必要である。 As shown in FIG. 1, the medium for preventing forgery having flexibility according to one embodiment of the present invention has a flexible support (11) on the same or different surface of the support (11). 2 is provided with a latent image device (12), a support (11) is provided with a light transmission part (14), and a verification device (13) is provided on the light transmission part (14), as shown in FIG. As shown in FIG. 3, when the support (11) is deformed and the verification device (13) is aligned with the latent image device (12), the same surface of the support (11) faces. As described above, the medium is a flexible anti-counterfeit medium having the latent image device (12) and the verification device (13) in which different images appear when different surfaces face each other. Further, it is necessary that the different images are designed in a relationship between negative and positive.
前記潜像デバイス（１２）は複数の光軸を持っており、前記検証デバイス（１３）が直線偏光子であるときに、同一の面が向き合う場合に、ある１つの潜像デバイス（１２）の光軸と検証デバイス（１３）の光軸とが一致し、異なる面が向き合う場合に、他の潜像デバイス（１２）の光軸と検証デバイス（１３）の光軸とが一致するように、潜像デバイス（１２）および検証デバイス（１３）を配置している。 The latent image device (12) has a plurality of optical axes. When the verification device (13) is a linear polarizer and the same surface faces, the latent image device (12) When the optical axis coincides with the optical axis of the verification device (13) and different surfaces face each other, the optical axis of the other latent image device (12) coincides with the optical axis of the verification device (13). A latent image device (12) and a verification device (13) are arranged.
また、前記潜像デバイス（１２）は右円偏光性を有する領域と左円偏光性を有する領域との２つの領域を持っており、前記検証デバイス（１３）が片方の面からは右円偏光子として機能し、もう片方の面からは左円偏光子として機能する。 The latent image device (12) has two regions, a region having right circular polarization and a region having left circular polarization, and the verification device (13) has a right circular polarization from one surface. It functions as a child and functions as a left circular polarizer from the other side.
さらに、前記潜像デバイス（１２）は複数の光軸を持っており、検証デバイス（１３）が直線偏光子に位相差子を両側に具備したデバイスであるときに、同一の面が向き合う場合に、潜像デバイス（１２）のある１つの光軸と検証デバイス（１３）のいずれかの面の位相差子の光軸とが一致し、異なる面が向き合う場合に、潜像デバイス（１２）の他の光軸と検証デバイス（１３）のもう片方の面の位相差子の光軸とが一致するように潜像デバイス（１２）および検証デバイス（１３）を配置している。 Further, when the latent image device (12) has a plurality of optical axes, and the verification device (13) is a device that includes a linear polarizer and phase retarders on both sides, the same surface faces each other. When the optical axis of one phase of the latent image device (12) and the optical axis of the phase retarder on either side of the verification device (13) match and different surfaces face each other, the latent image device (12) The latent image device (12) and the verification device (13) are arranged so that the other optical axis matches the optical axis of the phase retarder on the other surface of the verification device (13).
ここで、本発明に用いることのできる支持体（１１、２９、４２）について説明をする。支持体は可とう性を有することが必須であり、不透明なものでも透明なものでもよい。ただし、図２〜３に示すように、検証デバイス（１３）は支持体越しに検証を行う場合もあるので、不透明な支持体の場合には、支持体に窓を設ける等の工夫をしなくてはならない。 Here, the support (11, 29, 42) that can be used in the present invention will be described. It is essential that the support has flexibility, and it may be opaque or transparent. However, as shown in FIGS. 2 to 3, since the verification device (13) may perform verification over the support, in the case of an opaque support, there is no need to devise such as providing a window on the support. must not.
また、透明なものであっても支持体の複屈折率をコントロールされているものがよい。例えば、延伸加工により作製されたプラスチックフィルムを用いることができる。延伸フィルムには伸ばし方により、１軸延伸、２軸延伸フィルムがある。これらには、セロハン、ポリカーボネート（ＰＣ）、ポリエチレン（ＰＥ）、ポリプロピレン（ＰＰ）、ポリオレフィン（ＰＯ）、エチレンビニールアルコール（ＥＶＯＨ）、ポリビニールアルコール（ＰＶＡ）、ポリ塩化ビニル、ポリエチレンナフタレート（ＰＥＮ）、ポリエチレンテレフタレート（ＰＥＴ)、ナイロン、アクリル、トリアセチルセルロース（ＴＡＣ）フィルムなどが挙げられる。 Further, it is preferable that the birefringence of the support is controlled even if it is transparent. For example, a plastic film produced by stretching can be used. There are uniaxially stretched and biaxially stretched films depending on how to stretch. These include cellophane, polycarbonate (PC), polyethylene (PE), polypropylene (PP), polyolefin (PO), ethylene vinyl alcohol (EVOH), polyvinyl alcohol (PVA), polyvinyl chloride, polyethylene naphthalate (PEN). Polyethylene terephthalate (PET), nylon, acrylic, triacetyl cellulose (TAC) film, and the like.
次に、潜像デバイス（１２）と検証デバイス（１３）との組み合わせについて説明をする。本発明では、図２のように検証したときと、図３のように検証したときで異なる画像
が出現することを特徴としているので、支持体の形状及び、潜像デバイス（１２）と検証デバイス（１３）の支持体上の位置、潜像デバイス（１２）と検証デバイス（１３）との組み合わせは重要となってくる。本発明では検証のし易さから、支持体の形状は長方形で、潜像デバイス（１２）と検証デバイス（１３）とは、図1に示すように、長方形の長軸の両端に位置するように配置するのが望ましい。
Next, a combination of the latent image device (12) and the verification device (13) will be described. Since the present invention is characterized in that different images appear when verified as shown in FIG. 2 and when verified as shown in FIG. 3, the shape of the support, the latent image device (12), and the verification device The position on the support (13) and the combination of the latent image device (12) and the verification device (13) become important. In the present invention, for ease of verification, the shape of the support is rectangular, and the latent image device (12) and the verification device (13) are positioned at both ends of the long axis of the rectangle as shown in FIG. It is desirable to arrange in.
本発明で用いることのできるデバイスに偏光子がある。この偏光子は、ＰＶＡにヨウ素もしくは２色性染料を含浸させ、延伸配向させた吸収型偏光子、もしくは、２色性染料を配向膜状で配向させた吸収型偏光子、もしくはコレステリック液晶にλ／４位相差子を組み合わせた反射型偏光子、複屈折性多層フィルムを積層した反射型偏光子、ブルースター角でレンチキュラーレンズ状に形成したプリズム偏光子、複屈折物質を回折格子状に形成した複屈折回折偏光子、回折構造の溝を深く形成した回折偏光子などを利用することができる。この他にも、反射光、もしくは、透過光にて特定偏光成分を分離もしくは抽出できる素子であれば利用可能であり、本発明での偏光子とする。 A device that can be used in the present invention is a polarizer. This polarizer is an absorption polarizer in which PVA is impregnated with iodine or a dichroic dye and stretched and aligned, an absorption polarizer in which a dichroic dye is aligned in an alignment film, or a cholesteric liquid crystal with λ A reflective polarizer combining a / 4 phase retarder, a reflective polarizer laminated with a birefringent multilayer film, a prism polarizer formed into a lenticular lens shape with a Brewster angle, and a birefringent material formed in a diffraction grating shape A birefringent diffractive polarizer, a diffractive polarizer in which grooves of a diffractive structure are formed deeply, and the like can be used. In addition to this, any element that can separate or extract a specific polarization component by reflected light or transmitted light can be used, and the polarizer of the present invention is used.
潜像デバイス（１２）には、偏光子と位相差子の光軸方向をパターンで変えたものを組み合わせて形成され、部分的に潜像デバイス（１２）の偏光方向をパターンで変える方法を用いることが出来る。例えば、直線偏光子の光軸に対してλ／２位相差子の光軸が一致もしくは９０°傾けて設置した場合は位相差子の影響を受けない。しかし、直線偏光子の光軸に対して位相差子の光軸を１φ傾けて設置すると、偏光面が２φ傾く。例えば、偏光子光軸に対して４５°の角度でλ／２位相差子を形成した場合、偏光面は９０°回転する。このように、位相差子の光軸方向をパターンで変化させることにより、部分的に入射する偏光の偏光状態を変えることが出来る。 The latent image device (12) is formed by combining the optical axis directions of the polarizer and the phase retarder with a pattern, and a method of partially changing the polarization direction of the latent image device (12) with the pattern is used. I can do it. For example, when the optical axis of the λ / 2 phase retarder coincides with or is inclined by 90 ° with respect to the optical axis of the linear polarizer, it is not affected by the phase retarder. However, if the optical axis of the phase retarder is inclined by 1φ with respect to the optical axis of the linear polarizer, the polarization plane is inclined by 2φ. For example, when a λ / 2 phase retarder is formed at an angle of 45 ° with respect to the polarizer optical axis, the plane of polarization rotates 90 °. In this way, by changing the optical axis direction of the phase retarder with a pattern, the polarization state of partially incident polarized light can be changed.
位相差子の光軸をパターンで変える手段に、複屈折性を持つ液晶材料を用いることができる。複屈折とは、物質の屈折率が光軸方向によって異なることで、そのため物質中を光が通過するときにその速度が異なってくる。そのため、物質通過後の光には通過速度の差の分だけ位相差が生じる。ここで、配向膜を２軸方向に配向処理をし、その上に液晶を塗布することで２軸に配向された液晶を得ることができる。位相差値は液晶の複屈折率と膜厚で決定することができる。 A liquid crystal material having birefringence can be used as means for changing the optical axis of the phase retarder by a pattern. Birefringence means that the refractive index of a substance varies depending on the direction of the optical axis, and therefore the speed of light varies when passing through the substance. Therefore, a phase difference is generated in the light after passing through the substance by the difference in the passing speed. Here, the alignment film is subjected to an alignment treatment in a biaxial direction, and a liquid crystal is applied thereon, whereby a biaxially aligned liquid crystal can be obtained. The retardation value can be determined by the birefringence and film thickness of the liquid crystal.
図４のように、偏光子（３０）とパターンで配置された位相差子（２５）を組み合わせて潜像デバイスとすることもできる。偏光子（３０）の上に（２１）及び（２３）の位相差子ａ、ｂにλ／２位相差子を用いパターンで配置し、かつ２つの位相差子ａ、ｂの光軸（２２）と（２４）は長方形の支持体の長軸もしくは短軸を軸に±２２．５°の方向になるように配置したものを潜像デバイスとすることが望ましい。この位相差子に液晶をλ／２位相差子になるように設計し用いることもできる。コントラストを向上させるために吸収層を設けてもよい。このとき、偏光子（３０）の光軸は位相差子ａ、ｂの光軸（２２）もしくは（２４）と平行もしくは９０°になるように配置する。このとき、検証デバイスには直線偏光子を用い、検証デバイスの偏光子の光軸（２７）は潜像デバイスの位相差子ａ、ｂの光軸（２２）もしくは（２４）左右反転するように配置する。 As shown in FIG. 4, the polarizer (30) and the phase retarder (25) arranged in a pattern can be combined to form a latent image device. On the polarizer (30), λ / 2 phase retarders are arranged in a pattern for the phase retarders a and b of (21) and (23), and the optical axes (22 of the two phase retarders a and b) ) And (24) are preferably a latent image device in which a rectangular support is arranged so that the major axis or minor axis is in the direction of ± 22.5 °. The liquid crystal can be designed and used as a λ / 2 phase retarder for this phase retarder. An absorbing layer may be provided to improve the contrast. At this time, it arrange | positions so that the optical axis of a polarizer (30) may be parallel or 90 degrees with the optical axis (22) or (24) of phase differencer a and b. At this time, a linear polarizer is used as the verification device, and the optical axis (27) of the polarizer of the verification device is reversed left and right with respect to the optical axis (22) or (24) of the phase difference a, b of the latent image device. Deploy.
例えば、潜像デバイスの偏光子の光軸を位相差子ａ（２１）の光軸（２２）と一致させて作製したとすると、位相差子ａ（２１）を通過する光は位相差子の影響を受けないので偏光状態が保たれて通過し、位相差子ｂ（２３）を通過する光は、位相差子の光軸に４５°傾いて入射するために位相差子の影響を受け入射前の偏光状態から偏光方向が９０°傾いたものが通過してくることになる。このような潜像デバイスに対して、検証デバイスの光軸（２７）を位相差子ａ（２１）の光軸（２２）と左右反転した向きに配置した場合、媒体の長軸側を変形させ同一の面が向き合うようにすると、検証デバイスの光軸（２７）は位相差子ａ（２１）の光軸（２２）と方向が一致する。すると、位相差子ａ（２１）を通過する光は検証デバイスを通過し、位相差子ｂ（２３）を通過する光は偏光面が９０°回転しているので検証デバイスにより光を遮られる。 For example, assuming that the optical axis of the polarizer of the latent image device is made to coincide with the optical axis (22) of the phase retarder a (21), the light passing through the phase retarder a (21) Since it is not affected, the light passing through the polarization state is maintained and the light passing through the phase difference b (23) is incident on the optical axis of the phase difference at an angle of 45 °. The light whose polarization direction is inclined by 90 ° from the previous polarization state passes. For such a latent image device, when the optical axis (27) of the verification device is arranged in the direction horizontally reversed with respect to the optical axis (22) of the phase difference element a (21), the major axis side of the medium is deformed. If the same surface is made to face, the direction of the optical axis (27) of the verification device coincides with the optical axis (22) of the phase difference a (21). Then, the light passing through the phase retarder a (21) passes through the verification device, and the light passing through the phase retarder b (23) is blocked by the verification device because the polarization plane is rotated by 90 °.
さらに、媒体の長軸側を変形させ異なる面が向き合うようにすると、検証デバイスの光軸（２７）は位相差子ｂの光軸（２４）と方向が一致する。すると、位相差子ａ（２１）の部分を通過する光の偏光面は検証デバイスの光軸（２７）と９０°傾いているので光は遮られ、位相差子ｂ（２３）の部分は検証デバイスの光軸と一致するので光が透過する。 Further, when the long axis side of the medium is deformed so that different surfaces face each other, the direction of the optical axis (27) of the verification device coincides with the optical axis (24) of the phase difference b. Then, since the plane of polarization of the light passing through the phase retarder a (21) is inclined by 90 ° with respect to the optical axis (27) of the verification device, the light is blocked and the phase retarder b (23) is verified. Light is transmitted because it matches the optical axis of the device.
図５のように、位相差子（３５）を（３１）及び（３３）の位相差子ｃ、ｄにλ／４位相差子を用いパターンで配置し、かつ２つの位相差子ｃ、ｄの光軸（３２）と（３４）は長方形の支持体の長軸もしくは短軸を軸に±４５°の方向になるように配置したものを潜像デバイスとすることもできる。コントラストを向上させるために吸収層を設けてもよい。このとき、偏光子（３６）の光軸と位相差子ｃ、ｄの光軸（３２）もしくは（３４）に対して４５°の角度差をつけて配置する。この潜像デバイスに対して、検証デバイスは図５のように偏光子（４０）を２つの位相差子（３９）で挟んで作製する。このとき、位相差子（３９）はλ／４位相差子とし、偏光子の光軸（３８）と位相差子の光軸（４１）を４５°の角度差をつけて配置する。この場合、検証デバイスの光軸の方向は特に指定はない。 As shown in FIG. 5, the phase retarder (35) is arranged in a pattern using λ / 4 phase retarders for the phase retarders c and d of (31) and (33), and two phase retarders c and d are used. The optical axes (32) and (34) may be a latent image device in which the long and short axes of a rectangular support are arranged in a direction of ± 45 ° with respect to the long axis or short axis. An absorbing layer may be provided to improve the contrast. At this time, the optical axis of the polarizer (36) and the optical axes (32) or (34) of the phase retarders c and d are arranged with an angle difference of 45 °. For this latent image device, a verification device is manufactured by sandwiching a polarizer (40) between two phase retarders (39) as shown in FIG. At this time, the phase retarder (39) is a λ / 4 phase retarder, and the optical axis (38) of the polarizer and the optical axis (41) of the phase retarder are arranged with an angle difference of 45 °. In this case, the direction of the optical axis of the verification device is not particularly specified.
図５の偏光子（３６）に円偏光反射型偏光子を用いることもできる。（３１）及び（３３）の位相差子ｃ、ｄにλ／４位相差子を用いパターンで配置し、かつ２つの位相差子ｃ、ｄの光軸（３２）と（３４）は長方形の支持体の長軸もしくは短軸を軸に±４５°の方向になるように配置したものを潜像デバイスとすることが望ましい。このとき、検証デバイスには直線偏光子を用い、検証デバイスの偏光子の光軸（３８）を潜像デバイスの位相差子ｃ、ｄの光軸（３２）もしくは（３４）に対して４５°傾けて配置する。 A circularly polarized reflective polarizer can also be used for the polarizer (36) of FIG. The phase retarders c and d of (31) and (33) are arranged in a pattern using λ / 4 phase retarders, and the optical axes (32) and (34) of the two phase retarders c and d are rectangular. It is desirable to use a latent image device that is arranged so that the major axis or minor axis of the support is in the direction of ± 45 °. At this time, a linear polarizer is used for the verification device, and the optical axis (38) of the polarizer of the verification device is 45 ° with respect to the optical axis (32) or (34) of the phase shifter c, d of the latent image device. Tilt and place.
また、図５の偏光子（３６）に円偏光反射型偏光子を用いたときに、（３１）及び（３３）の位相差子ｃ、ｄにλ／２位相差子を用いパターンで配置し、かつ２つの位相差子ｃ、ｄの光軸（３２）と（３４）は長方形の支持体の長軸もしくは短軸を軸に±２２．５°の方向になるように配置したものを潜像デバイスとすることが望ましい。この潜像デバイスに対して、検証デバイスは図５のように偏光子（４０）を２つの位相差子（３９）で挟んで作製する。このとき、位相差子（３９）はλ／４位相差子とし、偏光子の光軸（３８）と位相差子の光軸（４１）を４５°の角度差をつけて配置する。 In addition, when a circularly polarized reflective polarizer is used for the polarizer (36) in FIG. 5, λ / 2 phase difference is used for the phase retarders c and d in (31) and (33) and arranged in a pattern. In addition, the optical axes (32) and (34) of the two phase retarders c and d are latently arranged in a direction of ± 22.5 ° with respect to the long or short axis of the rectangular support. An imaging device is desirable. For this latent image device, a verification device is manufactured by sandwiching a polarizer (40) between two phase retarders (39) as shown in FIG. At this time, the phase retarder (39) is a λ / 4 phase retarder, and the optical axis (38) of the polarizer and the optical axis (41) of the phase retarder are arranged with an angle difference of 45 °.
円偏光反射型偏光子はコレステリック液晶を用いても良い。また、前記の潜像デバイスには、右回り円偏光を反射するコレステリック液晶と左回り円偏光を反射するコレステリック液晶をパターン印刷しても良い。 A cholesteric liquid crystal may be used for the circularly polarized reflection type polarizer. The latent image device may be printed with a pattern of cholesteric liquid crystal that reflects clockwise circularly polarized light and cholesteric liquid crystal that reflects counterclockwise circularly polarized light.
また、潜像デバイス及び検証デバイスは、それぞれの機能を有する転写箔を作製し支持体に転写してもよいし、支持体に直接印刷することによって作製してもよいし、それぞれの機能を有するフィルムをラミネートして作製してもよい。 In addition, the latent image device and the verification device may be prepared by transferring a transfer foil having each function and transferring it to the support, or by printing directly on the support, or having each function. You may laminate and produce a film.
本発明を、具体的な実施例をあげて詳細に説明する。 The present invention will be described in detail with specific examples.
＜実施例１＞
可とう性を有する支持体として無延伸のトリアセチルセルロース（ＴＡＣ）フィルムを使用した。潜像デバイスは転写箔を作成しＴＡＣフィルムに転写した。また、検証デバイスはポリビニールアルコール（ＰＶＡ）フィルムにヨウ素を含浸させ、延伸配向させた吸収型偏光子を用い貼付した。
<Example 1>
An unstretched triacetyl cellulose (TAC) film was used as a support having flexibility. The latent image device produced a transfer foil and transferred it to a TAC film. Moreover, the verification device was stuck using the absorption type polarizer which impregnated the iodine and impregnated the polyvinyl alcohol (PVA) film, and was oriented.
潜像デバイスは、以下のように作成した。２軸延伸ポリエチレンテレフタレート（ＰＥＴ）フィルム（商品名：ルミラー２５Ｔ６０ 東レ株式会社製)を基材とし光配向剤（商品名：ＩＡ−０１ 大日本インキ化学工業株式会社製)をマイクログラビアで塗布し製膜を行った。この光配向剤は、３６５ｎｍの偏光光を照射すると、偏光方向に液晶配向力をもつ材料である。そこで光配向膜に対して偏光紫外線を用いて全面で２Ｊ／ｃｍ2の照射を行い、全面照射した偏光方向に対して４５°の角度差がつけた方向にパターンで２Ｊ／ｃｍ2の照射を行った。その後、液晶性モノアクリレートであるＵＶキュアラブル液晶（商品名：ＵＣＬ−００８ 大日本インキ化学工業株式会社製）をマイクログラビアにて塗工した。ＵＣＬ−００８の複屈折率は０．１８であるので、可視光の中心波長５５０ｎｍの光に対して位相差値がλ／４となるようにするために、膜厚を０．７６μｍとなるようにした。その上にコレステリック液晶（メルク社製）をマイクログラビアで塗工した。これに、スミインキを１．４μｍの厚さで、塩化ビニルと酢酸ビニルの共重合体の樹脂をインキ化し２μｍの厚さでマイクログラビアにて順次塗布しそれぞれ吸収層と接着剤として設けた。これを光配向膜が最上面になるように支持体にロール転写機にて熱転写した。転写する際は、片方の液晶の配向方向が支持体の短軸に対して平行になるように転写した。これに対して、検証デバイスは光軸が支持体の短軸に対して４５°傾くように転写した。 The latent image device was created as follows. Biaxially stretched polyethylene terephthalate (PET) film (trade name: Lumirror 25T60 manufactured by Toray Industries, Inc.) as a base material and photo-alignment agent (trade name: IA-01 manufactured by Dainippon Ink & Chemicals, Inc.) applied by microgravure. Membrane was performed. This photo-alignment agent is a material having a liquid crystal alignment force in the polarization direction when irradiated with 365 nm polarized light. Therefore, the surface of the photo-alignment film is irradiated with 2 J / cm 2 using polarized ultraviolet rays, and irradiated with a pattern of 2 J / cm 2 in a direction with an angle difference of 45 ° with respect to the polarization direction of the entire surface. went. Thereafter, UV curable liquid crystal (trade name: UCL-008, manufactured by Dainippon Ink & Chemicals, Inc.), which is a liquid crystalline monoacrylate, was applied by microgravure. Since the birefringence of UCL-008 is 0.18, the film thickness is set to 0.76 μm so that the phase difference value becomes λ / 4 with respect to the light having a central wavelength of 550 nm of visible light. I made it. A cholesteric liquid crystal (manufactured by Merck & Co., Inc.) was coated thereon with a micro gravure. To this, a sumi ink with a thickness of 1.4 μm and a vinyl chloride / vinyl acetate copolymer resin was converted into an ink and coated with a microgravure in a thickness of 2 μm to provide an absorption layer and an adhesive, respectively. This was thermally transferred to a support with a roll transfer machine so that the photo-alignment film was the uppermost surface. At the time of transfer, transfer was performed so that the alignment direction of one liquid crystal was parallel to the short axis of the support. On the other hand, the verification device was transferred so that the optical axis was inclined by 45 ° with respect to the short axis of the support.
このようにして作製した媒体を、図２に示すように、支持体を変形させて検証デバイスで潜像デバイスを見たところ、図６のような星型の画像が出現した。図５に示す、位相差子（３３）の部分が光が遮断され黒くなり、位相差子（３１）の部分がコレステリック液晶のカイラルピッチに一致した波長で光が反射された画像が出現した。 As shown in FIG. 2, when the latent image device was viewed with the verification device by deforming the support as shown in FIG. 2, a star-shaped image as shown in FIG. 6 appeared. As shown in FIG. 5, the phase difference (33) portion was blocked by light and black, and the phase difference (31) portion reflected light at a wavelength that coincided with the chiral pitch of the cholesteric liquid crystal.
また、図３に示すように、支持体を変形させて検証デバイスで潜像デバイスを見たところ、図６とはネガポジが反転した図７のような画像が出現した。位相差子（３３）の部分では、コレステリック液晶のカイラルピッチに一致した波長の光が反射されてきて、位相差子（３１）の部分が黒くなって現れた。このように、図２のように検証したときとは異なる画像が出現した。 Further, as shown in FIG. 3, when the latent image device was viewed with the verification device after the support was deformed, an image as shown in FIG. 7 in which the negative / positive was reversed from FIG. 6 appeared. At the phase retarder (33), light having a wavelength matching the chiral pitch of the cholesteric liquid crystal is reflected, and the phase retarder (31) appears black. In this way, an image different from that in the verification as shown in FIG. 2 appeared.
以上のような、偽造防止用媒体の検証方法は、可とう性を有する偽造防止用媒体の長軸側を変形させ同一の面が向き合うようにした場合に出現する画像と、長軸側を変形させ異なる面が向き合うようにした場合に同一の面が向き合うようにした場合とは異なる画像を出現させて真贋判定を行うものである。 As described above, the verification method of the anti-counterfeit medium is an image that appears when the major axis side of the anti-counterfeit medium having flexibility is deformed so that the same surface faces each other, and the major axis side is deformed. When different faces are made to face each other, an image different from the case where the same faces are made to face is made to appear and authenticity determination is performed.
１１、２９、４２・・・可とう性を有する支持体
１２・・・潜像デバイス
１３・・・検証デバイス
１４・・・光透過部
２１・・・位相差子ａ
２２・・・位相差子ａの光軸
２３・・・位相差子ｂ
２４・・・位相差子ｂの光軸
２５・・・パターンで配置した位相差子
２６、２８・・・偏光子
２７・・・偏光子の光軸
３０・・・偏光子
３１・・・位相差子ｃ
３２・・・位相差子ｃの光軸
３３・・・位相差子ｄ
３４・・・位相差子ｄの光軸
３５・・・パターンで配置した位相差子
３６、３７、３９、４０・・・偏光子
３８・・・偏光子の光軸
３９・・・位相差子
４１・・・位相差子の光軸
DESCRIPTION OF SYMBOLS 11, 29, 42 ... Flexible support body 12 ... Latent image device 13 ... Verification device 14 ... Light transmission part 21 ... Phase difference element a
22 ... Optical axis of phase difference element a 23 ... Phase difference element b
24: Optical axis of phase difference element b 25: Phase difference element arranged in pattern 26, 28: Polarizer 27: Optical axis of polarizer 30: Polarizer 31: Position Phase difference c
32 ... Optical axis of phase difference c 33 ... Phase difference d
34: Optical axis of phase difference element d 35: Phase difference elements arranged in a pattern 36, 37, 39, 40: Polarizer 38: Optical axis of polarizer 39: Phase difference element 41: Optical axis of phase retarder
Claims (3)
前記潜像デバイスが右円偏光性を有する領域と左円偏光性を有する領域との２つの領域を持っており、前記検証デバイスが片方の面からは右円偏光子として機能し、もう片方の面からは左円偏光子として機能する可とう性を有する偽造防止用媒体。 When a flexible support is provided with a latent image device and a verification device on the same or different surfaces of the support, and the verification device is aligned with the latent image device by deforming the support. A counterfeit prevention medium having a latent image device and a verification device in which different images appear depending on whether the same surface of the support faces or a different surface faces,
The latent image device has two regions, a region having right circular polarization and a region having left circular polarization, and the verification device functions as a right circular polarizer from one side, anti-counterfeit medium having flexible properties that acts as a left circularly photons from the surface.
前記潜像デバイスが複数の光軸を持っており、前記検証デバイスが直線偏光子に位相差子を両側に具備したデバイスであり、同一の面が向き合う場合に、潜像デバイスのある１つの光軸と検証デバイスのいずれかの面の位相差子の光軸とが一致し、異なる面が向き合う場合に、潜像デバイスの他の光軸と検証デバイスのもう片方の面の位相差子の光軸とが一致するように潜像デバイスおよび検証デバイスを配置した可とう性を有する偽造防止用媒体。 When a flexible support is provided with a latent image device and a verification device on the same or different surfaces of the support, and the verification device is aligned with the latent image device by deforming the support. A counterfeit prevention medium having a latent image device and a verification device in which different images appear depending on whether the same surface of the support faces or a different surface faces,
The latent image device has a plurality of optical axes, the verification device Ri Ah in the device provided with the phase Sako on both sides linear polarizer, when the same surface is facing, one with a latent image device If the optical axis and the optical axis of the phase retarder on one side of the verification device match and different planes face each other, the other optical axis of the latent image device and the phase retarder on the other side of the verification device latent image device and the anti-counterfeit medium having variable Tou of placing the verification device such that the optical axes coincide.
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| JP3689237B2 (en) * | 1998-03-27 | 2005-08-31 | 日本発条株式会社 | Object identification structure |
| JP2003170649A (en) * | 2001-12-06 | 2003-06-17 | Toppan Printing Co Ltd | Antiforgery printed matter having latent image |
| JP4909535B2 (en) * | 2005-06-23 | 2012-04-04 | 日東電工株式会社 | Laminated reflector, authentication card, barcode label, authentication system, and authentication area forming system |
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