JPH1142875A - Identification structure of object and object with the structure - Google Patents
Identification structure of object and object with the structureInfo
- Publication number
- JPH1142875A JPH1142875A JP20313597A JP20313597A JPH1142875A JP H1142875 A JPH1142875 A JP H1142875A JP 20313597 A JP20313597 A JP 20313597A JP 20313597 A JP20313597 A JP 20313597A JP H1142875 A JPH1142875 A JP H1142875A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- cholesteric liquid
- identification structure
- light
- authenticity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- B42D25/364—Liquid crystals
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Credit Cards Or The Like (AREA)
- Liquid Crystal (AREA)
- Printing Methods (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、パスポート、カー
ド、証書、商品券、絵画、切符、公共競技投票券等の平
面的な対象物または各種立体的な対象物の偽造防止を目
的とする識別構造に関し、特に対象物に設けたセキュリ
ティ媒体を視または機械的に認識することにより、その
真正性を識別するための構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to identification of flat or various three-dimensional objects such as passports, cards, certificates, gift certificates, paintings, tickets, public voting tickets, etc. for the purpose of preventing forgery. The present invention relates to a structure, particularly to a structure for identifying the authenticity of a security medium provided on an object by visually or mechanically recognizing the security medium.
【０００２】[0002]
【従来の技術】従来、例えばカード、証書類の偽造防止
方法としては、その対象物の表面にホログラムを貼付
し、これを目視により識別してその真正性を判定するも
のが一般的であった。また、目視による曖昧さを解消す
るべく特定の回折特性を有するホログラムを用い、該ホ
ログラムに所定波長の光を照射し、その回折光の受光位
置により真正性を判定するものも提案されている。2. Description of the Related Art Conventionally, as a method of preventing forgery of a card or a certificate, for example, a method of attaching a hologram to the surface of an object and visually identifying the hologram to determine its authenticity has been generally used. . There has also been proposed a hologram having a specific diffraction characteristic in order to eliminate ambiguity caused by visual observation, irradiating the hologram with light having a predetermined wavelength, and determining the authenticity based on a light receiving position of the diffracted light.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、近年の
ホログラム製造技術の普及に伴い、ホログラムの製造が
容易になり、特に目視用ホログラムは真正なものと区別
のつかない程の複製（偽造）品が比較的容易に製造され
るようになっている。そのため、ホログラムによる偽造
防止効果が低くなっていることは否めない。また、他の
偽造防止技術は高価であるなど、一般に流通する物品に
適するものが少なく、新規な偽造防止技術の開発が望ま
れていた。However, with the spread of hologram manufacturing technology in recent years, hologram manufacturing has become easier. In particular, visual (hologram) holograms that cannot be distinguished from genuine holograms have been produced. It is relatively easy to manufacture. Therefore, it cannot be denied that the forgery prevention effect of the hologram is low. Other anti-counterfeiting techniques are expensive and few are suitable for commonly distributed articles, and development of new anti-counterfeiting techniques has been desired.
【０００４】本発明は、上記したような従来技術の問題
点を解決するべく案出されたものであり、偽造が極めて
困難であり、かつその識別性も高い一般に流通する物品
に適した対象物の識別構造及びその構造が設けられた対
象物を安価に提供することを目的とする。The present invention has been devised in order to solve the above-mentioned problems of the prior art, and is an object which is extremely difficult to forge and has high discriminability and which is suitable for commonly distributed articles. It is an object of the present invention to provide an inexpensive identification structure and an object provided with the structure.
【０００５】[0005]
【課題を解決するための手段】上記した目的は、本発明
によれば、対象物に設けたセキュリティ媒体を光学的に
認識することにより、該対象物の真正性を識別するため
の対象物の識別構造であって、前記セキュリティ媒体
に、反射波長が１種類または複数種類の高分子コレステ
リック液晶を用いたことを特徴とする対象物の識別構造
を提供することにより達成される。特に、前記セキュリ
ティ媒体からの反射光または透過光を、波長板及び偏光
フィルタを通してまたは色フィルタを通して認識または
検出すると良く、高分子コレステリック液晶をこのフィ
ルタとしても用いることもできる。また、前記セキュリ
ティ媒体を、互いに異なる特性を有する複数種類の高分
子コレステリック液晶を予め定められた規則に従って配
列してなる複数の領域から構成したり、高分子コレステ
リック液晶からなる領域と、擬領域とを予め定められた
規則に従って配列し、その配列パターンを認識すること
により、対象物の真正性を識別すれば、一層その識別性
が向上する。According to the present invention, the object of the present invention is to identify the authenticity of an object by optically recognizing a security medium provided on the object. This is achieved by providing an identification structure for an object, characterized in that a polymer cholesteric liquid crystal having one or more kinds of reflection wavelengths is used as the security medium. In particular, reflected light or transmitted light from the security medium may be recognized or detected through a wave plate and a polarizing filter or through a color filter, and a polymer cholesteric liquid crystal may be used as this filter. Further, the security medium may be composed of a plurality of regions formed by arranging a plurality of types of polymer cholesteric liquid crystals having different characteristics from each other according to a predetermined rule, or a region composed of a polymer cholesteric liquid crystal and a pseudo region. Are arranged in accordance with a predetermined rule, and if the authenticity of the object is identified by recognizing the arrangement pattern, the discriminability is further improved.
【０００６】一般にコレステリック液晶は層状構造をな
しており、各層での分子長軸方向が互いに平行であり、
かつ層面に平行である。また、各層は少しずつ回転して
重なっており、立体的にスパイラル構造をとる。この方
向因子が３６０°回転して元へ戻るまでの距離、即ちピ
ッチｐと、各層内の平均屈折率ｎとから、λ＝ｎ・ｐで
表される波長λの円偏光に対して選択的に反射する特徴
を有する。従って、上記各層の液晶の方向が、入射光に
対して左回りならば、上記波長λの成分の左円偏光は反
射され、右円偏光は透過する。また、その他の波長の光
は全て透過する。例えば、可視光を吸収する黒紙の如き
材料の上に、赤色の波長λRを反射するコレステリック
液晶を配置し、太陽光などのランダム光を当てると透過
光は全て吸収され、波長λRの左円偏光のみが反射され
るので、コレステリック液晶は鮮やかな赤色に見える。In general, a cholesteric liquid crystal has a layered structure, and the molecular long axis directions in each layer are parallel to each other.
And it is parallel to the layer plane. In addition, each layer is rotated and overlapped little by little to form a three-dimensional spiral structure. Selective for circularly polarized light of wavelength λ represented by λ = n · p, based on the distance until this direction factor rotates 360 ° and returns to its original state, that is, the pitch p and the average refractive index n in each layer. It has the characteristic of reflecting light. Therefore, if the direction of the liquid crystal in each layer is counterclockwise with respect to the incident light, the left circularly polarized light of the wavelength λ component is reflected and the right circularly polarized light is transmitted. In addition, all light of other wavelengths is transmitted. For example, a cholesteric liquid crystal that reflects a red wavelength λ R is placed on a material such as black paper that absorbs visible light, and when random light such as sunlight is applied, all transmitted light is absorbed and the wavelength λ R Since only left circularly polarized light is reflected, the cholesteric liquid crystal looks bright red.
【０００７】また、コレステリック液晶は見る角度によ
って色が変わるという特徴を有する。これは、液晶面に
対する入射角をθとすると、この液晶の表面と底面、即
ちピッチｐ間で反射する光路差は２ｐｃｏｓθとなる。
この光路差が波長λの整数倍に等しくなる（２ｐ・ｃｏ
ｓθ＝ｎλ ｎは整数）と、両者の反射光は重複して強
め合う。従って、入射角が浅くなるに従い強め合う波長
は短く、即ち赤色から青色へ変化する。[0007] The cholesteric liquid crystal has a characteristic that the color changes depending on the viewing angle. This is because, assuming that the incident angle with respect to the liquid crystal surface is θ, the optical path difference reflected between the surface and the bottom surface of the liquid crystal, that is, between the pitches p is 2 pcos θ.
This optical path difference becomes equal to an integral multiple of the wavelength λ (2p · co
sθ = nλn is an integer), and the reflected light of both overlaps and strengthens. Therefore, as the incident angle becomes shallower, the constructive wavelength becomes shorter, that is, changes from red to blue.
【０００８】一方、一般に低分子の液晶は温度、電場及
び磁気に敏感であり、それらの影響により色の変化を示
すが、高分子のコレステリック液晶はこれらに対して非
常に安定であり、殆どその影響を受けない。高分子のコ
レステリック液晶は、例えばＰＥＴフィルムに液晶を塗
り、温度をかけ、電場、磁場、圧力、添加剤等を工夫す
ることにより、所望のピッチとし、かつ安定化させるこ
とができる。[0008] On the other hand, low-molecular liquid crystals are generally sensitive to temperature, electric field and magnetism, and exhibit a color change under the influence of them. However, high-molecular cholesteric liquid crystals are very stable against these, and almost all Not affected. The polymer cholesteric liquid crystal can be stabilized at a desired pitch by, for example, applying liquid crystal to a PET film, applying a temperature, and devising an electric field, a magnetic field, a pressure, and additives.
【０００９】ホログラムは、平面上の溝間隔によってそ
の光学的な特性が定まることから、その溝の加工技術さ
え有していれば比較的複製し易いが、高分子コレステリ
ック液晶の光学的な特性は立体的な分子間隔によって定
まることから、その製造には材料、加工技術等に高いノ
ウハウを必要とし、複製は困難である。そこで、高分子
コレステリック液晶の上記特性を利用してカード、パス
ポート、証券、商品券等の偽造を防止するための識別に
利用することで識別性を向上すると共に偽造防止効果を
向上し得る。Since the optical characteristics of a hologram are determined by the distance between grooves on a plane, it is relatively easy to copy the hologram as long as the hologram has a processing technique. However, the optical characteristics of a polymer cholesteric liquid crystal are poor. Since it is determined by the three-dimensional molecular spacing, its production requires high know-how in materials and processing techniques, and it is difficult to duplicate. Therefore, by utilizing the above characteristics of the polymer cholesteric liquid crystal for identification for preventing forgery of cards, passports, securities, gift certificates, and the like, it is possible to improve the discriminating property and improve the forgery prevention effect.
【００１０】[0010]
【発明の実施の形態】以下に、本発明の好適な実施形態
について説明する。Preferred embodiments of the present invention will be described below.
【００１１】図１に示すように、所定のピッチｐの高分
子コレステリック液晶を形成した箔１を、例えばホット
スタンプ法によってカード、パスポート、証券、商品券
等の対象物Ａの適所または全体に１つまたは２つ以上貼
り付ける。ここで、ホットスタンプとは、図９に示すよ
うな装置を用いて装飾薄膜を瞬間的な熱と圧力とにより
対象物の表面に転写する方法である。具体的には、ホル
ダ６１に対象物Ａをセットし、供給ロール６２から供給
され、巻き取りロール６３に巻き取られるホットスタン
ピングホイル６４を、図示されないシリンダ等のアクチ
ュエータにより駆動されると共に加熱板６５により加熱
される凸型金型６６により対象物Ａに押圧する。ホット
スタンピングホイル６４は、一般にベースフィルムに離
型層、保護層、金属薄膜層及び接着層を重ねたものであ
り、押圧時にその圧力及び熱によりベースフィルムから
保護層、高分子コレステリック液晶を形成した金属薄膜
層及び接着層が離型し、対象物に転写され、箔１をなす
ようになる。As shown in FIG. 1, a foil 1 on which a polymer cholesteric liquid crystal having a predetermined pitch p is formed is put on a target object A such as a card, a passport, a security, a gift certificate or the like by a hot stamp method, for example. Paste one or more. Here, hot stamping is a method of transferring a decorative thin film to the surface of an object using instantaneous heat and pressure using an apparatus as shown in FIG. More specifically, the target A is set on the holder 61, and the hot stamping wheel 64 supplied from the supply roll 62 and wound on the take-up roll 63 is driven by an actuator such as a cylinder (not shown) and heated by the heating plate 65. The object A is pressed by the convex mold 66 heated by the above. The hot stamping foil 64 is generally formed by laminating a release layer, a protective layer, a metal thin film layer and an adhesive layer on a base film. When pressed, the pressure and heat form a protective layer and a polymer cholesteric liquid crystal from the base film. The metal thin film layer and the adhesive layer are released from the mold, transferred to the object, and form the foil 1.
【００１２】このようにして対象物に設けられた箔１、
即ち高分子コレステリック液晶を目視により、または機
械により読み取り、認識することとなる。The foil 1 provided on the object in this way,
That is, the polymer cholesteric liquid crystal is read and recognized visually or mechanically.
【００１３】尚、対象物にセキュリティ媒体としての箔
１を貼付する方法としては上記ホットスタンプ以外にヒ
ートシール法、ロール式手貼りのシール等がある。As a method for attaching the foil 1 as a security medium to an object, there are a heat sealing method, a roll-type hand-applied seal and the like in addition to the hot stamp.
【００１４】[0014]
実施例１ 図２に示すように、本発明による高分子コレステリック
液晶を形成したセキュリティ媒体としての箔１を対象物
Ａの適所に転写、または貼り付けている。Example 1 As shown in FIG. 2, a foil 1 as a security medium on which a polymer cholesteric liquid crystal according to the present invention was formed was transferred or affixed to an appropriate position of an object A.
【００１５】これに光を当てた場合、液晶の特性に応じ
た色を反射することから、これを目視により、または機
械的に検出することによりその真正性を判定できる。但
し、通常のインクを塗布（印刷）した場合でも或る程度
これと同様な効果は得られることから、液晶面に対して
光の入射角を徐々に浅く変化させ、その色変化により識
別すると良い。前述したように反射光の強め合う波長は
短波光側に連続的に変化し反射光の色を変化することか
ら、これにより、その真正性を確実に判定できる。云う
までもなく、通常のインクを塗布したものでは入射角変
化によって反射光の色（波長）変化は得られない。When light is applied to this, since the color reflects the characteristics of the liquid crystal, its authenticity can be determined by visual or mechanical detection. However, even when ordinary ink is applied (printed), the same effect can be obtained to some extent, so that the incident angle of light with respect to the liquid crystal surface is gradually changed to be shallow, and it is preferable to identify the light by its color change. . As described above, the constructive wavelength of the reflected light continuously changes to the short-wave light side and changes the color of the reflected light, so that its authenticity can be reliably determined. Needless to say, the color (wavelength) of the reflected light cannot be obtained due to the change in the incident angle in the case where ordinary ink is applied.
【００１６】実施例２ 図３に示すように、本実施例では、識別時、対象物Ａの
適所に転写、または貼り付けたセキュリティ媒体として
の高分子コレステリック液晶を形成した箔１の直上に、
この液晶の反射波長をカットするフィルタ２を配置し、
箔１と直交する方向に対してθだけ傾けた方向から光が
入射した場合の反射光の方向に上記同様なフィルタ３を
配置する。Embodiment 2 As shown in FIG. 3, in this embodiment, at the time of discrimination, a polymer cholesteric liquid crystal as a security medium which has been transferred or affixed to an appropriate position of an object A is formed immediately above a foil 1.
A filter 2 for cutting the reflection wavelength of the liquid crystal is arranged,
A filter 3 similar to the above is disposed in the direction of reflected light when light enters from a direction inclined by θ with respect to a direction orthogonal to the foil 1.
【００１７】この箔１にランダム光をその直上から入射
した場合、例えばこの液晶が赤色光を反射する特性を有
するものとすると、反射光がフィルタ２を透過せず、暗
くなり、反射光を認識できないが、箔１と直交する方向
に対してθだけ傾けた方向から光を入射した場合、強め
合う波長が短くなり（青色に近くなり）、フィルタ３を
透過し、反射光を認識できる。これを目視により認識
し、真正性を判定しても良いが、受光素子等を上記各方
向に対応する位置に配置して反射光の受光強度を検出し
て真正性を判定しても良い。When random light is incident on the foil 1 from directly above, for example, if the liquid crystal has a property of reflecting red light, the reflected light does not pass through the filter 2 but becomes dark, and the reflected light is recognized. However, when light is incident from a direction inclined by θ with respect to a direction orthogonal to the foil 1, the constructive wavelength is shortened (closer to blue), transmitted through the filter 3, and reflected light can be recognized. This may be visually recognized to determine the authenticity, or the authenticity may be determined by arranging a light receiving element or the like at a position corresponding to each of the above directions and detecting the received light intensity of the reflected light.
【００１８】実施例３ 図４に示すように、本実施例では、識別時、対象物Ａの
適所に転写、または貼り付けたセキュリティ媒体として
の高分子コレステリック液晶を形成した箔１からの反射
光の至る位置に、この液晶と同じ特性、即ち箔１に形成
された高分子コレステリック液晶と同じ波長の同じ円偏
光成分のみを反射する特性を有するコレステリック液晶
からなる液晶フィルタ４を配置する。Embodiment 3 As shown in FIG. 4, in this embodiment, at the time of identification, reflected light from a foil 1 on which a polymer cholesteric liquid crystal is formed or transferred as a security medium at an appropriate position on an object A. A liquid crystal filter 4 made of a cholesteric liquid crystal having the same characteristics as this liquid crystal, that is, the characteristics of reflecting only the same circularly polarized light component having the same wavelength as that of the polymer cholesteric liquid crystal formed on the foil 1 is arranged.
【００１９】この箔１にランダム光を入射した場合、そ
の反射光はフィルタ４を透過せず、暗くなり、反射光を
認識できないが、フィルタ４を介さずに見ると所定の色
の反射光を認識できる。その差を目視により認識し、真
正性を判定しても良いが、フィルタ４を介在させた場合
とさせない場合とで受光素子等により反射光の受光強度
を検出し、その差から真正性を判定しても良い。When random light is incident on the foil 1, the reflected light does not pass through the filter 4 and becomes dark, and the reflected light cannot be recognized. However, when viewed without passing through the filter 4, the reflected light of a predetermined color is reflected. Can be recognized. The difference may be visually recognized and the authenticity may be determined, but the light receiving intensity of the reflected light is detected by a light receiving element or the like when the filter 4 is interposed or not, and the authenticity is determined from the difference. You may.
【００２０】実施例４ 図５に示すように、本実施例では、対象物Ａの適所に、
セキュリティ媒体としての互いに異なる特性を有する２
種類の高分子コレステリック液晶２１ａ、２１ｂを重ね
て形成した箔２１を転写、または貼り付けている。Embodiment 4 In this embodiment, as shown in FIG.
2 with different properties as security media
A foil 21 formed by stacking various types of polymer cholesteric liquid crystals 21a and 21b is transferred or pasted.
【００２１】また識別時、箔２１からの反射光の至る位
置に、各液晶２１ａ、２１ｂと同じ特性を有するコレス
テリック液晶からなる液晶フィルタ５、６を配置する。At the time of identification, liquid crystal filters 5 and 6 made of cholesteric liquid crystal having the same characteristics as the liquid crystals 21a and 21b are arranged at positions where the reflected light from the foil 21 reaches.
【００２２】例えば、液晶２１ａ及び液晶フィルタ５は
赤色を反射し、液晶２１ｂ及び液晶フィルタ６は青色を
反射するものとすると、まずランダム光が入射したとき
の箔２１からの反射光は紫色になる。また、その反射光
を液晶フィルタ５を介して見ると透過光は青色になり、
液晶フィルタ６を介して見ると赤色になる。従って、そ
の違いを直接目視により認識し、真正性を判定しても良
いが、両者の波長を検出して比較することにより真正性
を判定しても良い。For example, assuming that the liquid crystal 21a and the liquid crystal filter 5 reflect red, and the liquid crystal 21b and the liquid crystal filter 6 reflect blue, the light reflected from the foil 21 when random light enters first becomes purple. . When the reflected light is viewed through the liquid crystal filter 5, the transmitted light becomes blue,
The color turns red when viewed through the liquid crystal filter 6. Therefore, the difference may be directly visually recognized to determine the authenticity, or the authenticity may be determined by detecting and comparing the two wavelengths.
【００２３】実施例５ 図６（ａ）に示すように、本実施例では、対象物Ａの適
所または全体に、セキュリティ媒体としての互いに異な
る特性を有する２種類の高分子コレステリック液晶３１
ａ、３１ｂを互いに重ならないようにデザイン図形、文
字または模様をなすように形成した箔３１を転写、また
は貼り付けている。これらの液晶は反射波長は同じであ
るが、反射する円偏向成分が相反するものである。即
ち、液晶３１ａが右円偏向成分を反射するものであり、
液晶３１ｂが左円偏向成分を反射するものであるとす
る。Embodiment 5 As shown in FIG. 6 (a), in this embodiment, two types of polymer cholesteric liquid crystals 31 having different characteristics as security media are provided at appropriate places or on the entirety of an object A.
A foil 31 formed to form a design figure, character, or pattern is transferred or pasted so that a and 31b do not overlap each other. These liquid crystals have the same reflection wavelength, but the reflected circularly polarized components are opposite. That is, the liquid crystal 31a reflects the right circularly polarized component,
It is assumed that the liquid crystal 31b reflects a left circularly polarized light component.
【００２４】また識別時、箔３１からの反射光の至る位
置に、液晶３１ａ、３１ｂのいずれか一方と同じ特性を
有するコレステリック液晶からなる液晶フィルタ７を配
置する（図６（ｂ））。At the time of identification, a liquid crystal filter 7 made of a cholesteric liquid crystal having the same characteristics as one of the liquid crystals 31a and 31b is arranged at a position where the reflected light from the foil 31 reaches (FIG. 6B).
【００２５】ランダム光が入射したときの箔３１からの
反射光は液晶３１ａ、３１ｂの反射波長に応じた色にな
るが、液晶３１ａと液晶３１ｂとの区別、即ちデザイン
図形、文字または模様を認識することはできない。そこ
で、その反射光を液晶フィルタ７を介して見ると、液晶
３１ａ、３１ｂのいずれか一方からの反射光が見えなく
なり、デザイン図形、文字または模様が認識できるよう
になる。これを直接目視により認識し、真正性を判定す
ることとなる。The light reflected from the foil 31 when the random light is incident has a color corresponding to the reflection wavelength of the liquid crystals 31a and 31b, but distinguishes the liquid crystal 31a from the liquid crystal 31b, that is, recognizes a design figure, character or pattern. I can't. Therefore, when the reflected light is viewed through the liquid crystal filter 7, the reflected light from one of the liquid crystals 31a and 31b becomes invisible, and the design figure, character, or pattern can be recognized. This is directly visually recognized to determine authenticity.
【００２６】実施例６ 本実施例では対象物Ａの適所に転写、または貼り付けら
れたセキュリティ媒体としての箔４１に形成された高分
子コレステリック液晶が赤外線を反射するようになって
いる。従って、可視光を反射しないことから目視では透
明となる。Embodiment 6 In this embodiment, a polymer cholesteric liquid crystal formed on a foil 41 as a security medium transferred or affixed to an appropriate position of the object A reflects infrared rays. Therefore, since it does not reflect visible light, it becomes transparent visually.
【００２７】また図７に示すように、識別時、赤外線レ
ーザの発光素子８から赤外線レーザを箔４１に照射する
ようになっている。その反射光の至る位置には、λ／４
板９、偏光フィルタ１０及び受光素子１１がこの順番に
配置されている。As shown in FIG. 7, an infrared laser is emitted from the infrared laser light emitting element 8 to the foil 41 at the time of identification. At the position where the reflected light reaches, λ / 4
The plate 9, the polarizing filter 10, and the light receiving element 11 are arranged in this order.
【００２８】識別時、赤外線レーザを箔４１に照射し、
その反射光をλ／４板９で直線偏光に変換し、その光軸
に合わせて偏光フィルタ１０を通して受光部１１で受光
することにより、その受光強度から真正性を判定するこ
とができる。At the time of identification, the foil 41 is irradiated with an infrared laser,
The reflected light is converted into linearly polarized light by the λ / 4 plate 9 and received by the light receiving unit 11 through the polarizing filter 10 in accordance with the optical axis, so that the authenticity can be determined from the received light intensity.
【００２９】実施例７ 本実施例では、対象物Ａの適所に、赤外線を反射する高
分子コレステリック液晶が形成された箔５１ａ、５１ｃ
と透明なＰＥＴフィルム５１ｂ、５１ｄ、５１ｅとが予
め定められた規則に従って配列され、セキュリティ媒体
を構成している。Embodiment 7 In this embodiment, foils 51a and 51c on which a polymer cholesteric liquid crystal reflecting infrared rays are formed at a proper position of an object A.
And the transparent PET films 51b, 51d, 51e are arranged according to a predetermined rule, and constitute a security medium.
【００３０】識別時、箔５１ａ、ＰＥＴフィルム５１
ｂ、箔５１ｃ、ＰＥＴフィルム５１ｄ、５１ｅを順番に
スキャンして実施例６と同様にその反射光をλ／４板、
偏光フィルタを通して受光部で受光すると、箔５１ａ、
５１ｃの受光強度のみが強くなることから、例えば所定
値以上の受光強度を「１」、それ以外を「０」として、
上記配列パターンの場合、「１０１００」という２値デ
ータが得られる。これを予め記憶されたデータと比較す
ることにより、その真正性を判定することができる。そ
の組み合わせは、箔またはフィルムの数をｎとして２n
−１通りである。At the time of identification, the foil 51a, the PET film 51
b, foil 51c, PET films 51d and 51e are sequentially scanned, and the reflected light is
When light is received by the light receiving unit through the polarizing filter, the foil 51a,
Since only the received light intensity of 51c becomes strong, for example, the received light intensity of a predetermined value or more is set to “1”, and the other is set to “0”.
In the case of the above arrangement pattern, binary data “10100” is obtained. By comparing this with data stored in advance, its authenticity can be determined. The combination is 2 n , where n is the number of foils or films.
-1.
【００３１】尚、ＰＥＴフィルムに代えて箔５１ａ、５
１ｃの高分子コレステリック液晶と異なる特性を有する
高分子コレステリック液晶を形成した箔を用い、その特
性の差から上記の如く２値データを読み取っても良い。In place of the PET film, foils 51a,
The binary data may be read as described above from the difference in the characteristics using a foil formed with a polymer cholesteric liquid crystal having characteristics different from those of the polymer cholesteric liquid crystal 1c.
【００３２】[0032]
【発明の効果】以上の説明により明らかなように、本発
明によれば、対象物に設けるセキュリティ媒体に、反射
波長が１種類または複数種類の高分子コレステリック液
晶を用いることで、その高い識別性及び安定性に加えて
高い製造困難性により対象物の真正性の判定を容易に、
かつ信頼性良く行うことができ、偽造防止効果を向上し
得る。また、高分子コレステリック液晶は安価であこと
から、製造コストが高騰化する心配もない。As is apparent from the above description, according to the present invention, a high cholesteric liquid crystal having one or a plurality of reflection wavelengths is used as a security medium provided on an object, thereby achieving high discrimination. And easy to determine the authenticity of the object by high manufacturing difficulty in addition to stability,
And it can be performed with high reliability, and the forgery prevention effect can be improved. Further, since the polymer cholesteric liquid crystal is inexpensive, there is no concern that the production cost will increase.
【図１】本発明に基づく識別構造が設けられた対象物の
基本構成を示す斜視図。FIG. 1 is a perspective view showing a basic configuration of an object provided with an identification structure according to the present invention.
【図２】本発明に基づく対象物の識別構造の実施例１に
於ける構成を示す斜視図。FIG. 2 is a perspective view showing a configuration of an object identification structure according to a first embodiment of the present invention.
【図３】本発明に基づく対象物の識別構造の実施例２に
於ける構成を示す斜視図。FIG. 3 is a perspective view showing a configuration of an object identification structure according to a second embodiment of the present invention.
【図４】本発明に基づく対象物の識別構造の実施例３に
於ける構成を示す斜視図。FIG. 4 is a perspective view showing a configuration of an object identification structure according to a third embodiment of the present invention.
【図５】本発明に基づく対象物の識別構造の実施例４に
於ける構成を示す拡大断面図。FIG. 5 is an enlarged cross-sectional view showing a configuration of an object identification structure according to a fourth embodiment of the present invention.
【図６】（ａ）、（ｂ）共に本発明に基づく対象物の識
別構造の実施例５に於ける構成を示す平面図。6 (a) and 6 (b) are plan views showing the configuration of an object identification structure according to a fifth embodiment of the present invention.
【図７】本発明に基づく対象物の識別構造の実施例６に
於ける構成を示す斜視図。FIG. 7 is a perspective view showing a configuration of an object identification structure according to a sixth embodiment of the present invention.
【図８】本発明に基づく対象物の識別構造の実施例７に
於ける構成を示す斜視図。FIG. 8 is a perspective view showing the configuration of an object identification structure according to a seventh embodiment of the present invention.
【図９】ホットスタンピング装置の概略構成を示す側面
図。FIG. 9 is a side view showing a schematic configuration of a hot stamping device.
１ 箔 ２、３ フィルタ ４〜７ 液晶フィルタ ８ 赤外線レーザ発光素子 ９ λ／４板 １０ 偏光フィルタ １１ 受光素子 ２１ 箔 ２１ａ、２１ｂ 液晶 ３１ 箔 ３１ａ、３１ｂ 液晶 ４１、５１ 箔 ５１ａ、５１ｃ 箔 ５１ｂ、５１ｄ、５１ｅ ＰＥＴフィルム ６１ ホルダ ６２ 供給ロール ６３ 巻き取りロール ６４ ホットスタンピングホイル ６５ 加熱板 ６６ 凸型金型 Reference Signs List 1 foil 2, 3 filter 4 to 7 liquid crystal filter 8 infrared laser light emitting element 9 λ / 4 plate 10 polarizing filter 11 light receiving element 21 foil 21a, 21b liquid crystal 31 foil 31a, 31b liquid crystal 41, 51 foil 51a, 51c foil 51b, 51d , 51e PET film 61 Holder 62 Supply roll 63 Winding roll 64 Hot stamping foil 65 Heating plate 66 Convex mold
Claims (7)
学的に認識することにより、該対象物の真正性を識別す
るための対象物の識別構造であって、 前記セキュリティ媒体に、反射波長が１種類または複数
種類の高分子コレステリック液晶を用いたことを特徴と
する対象物の識別構造。An object identification structure for identifying the authenticity of an object by optically recognizing a security medium provided on the object, wherein the security medium has a reflection wavelength of 1 An object identification structure characterized by using one or more kinds of polymer cholesteric liquid crystals.
たは透過光を、波長板及び偏光フィルタを通してまたは
色フィルタを通して認識または検出することを特徴とす
る請求項１に記載の対象物の識別構造。2. The object identification structure according to claim 1, wherein reflected light or transmitted light from the security medium is recognized or detected through a wave plate and a polarizing filter or through a color filter.
フィルタとしても用いたことを特徴とする請求項２に記
載の対象物の識別構造。3. The object identification structure according to claim 2, wherein the polymer cholesteric liquid crystal is also used as the filter.
る特性を有する複数種類の高分子コレステリック液晶を
予め定められた規則に従って配列してなる複数の領域か
ら構成され、その配列パターンを認識することにより、
対象物の真正性を識別するようになっていることを特徴
とする請求項１乃至請求項３のいずれかに記載の対象物
の識別構造。4. The security medium includes a plurality of regions in which a plurality of types of polymer cholesteric liquid crystals having different characteristics are arranged according to a predetermined rule, and by recognizing the arrangement pattern,
4. The object identification structure according to claim 1, wherein the authenticity of the object is identified.
ステリック液晶からなる領域と、擬領域とを予め定めら
れた規則に従って配列してなり、その配列パターンを認
識することにより、対象物の真正性を識別するようにな
っていることを特徴とする請求項１乃至請求項３のいず
れかに記載の対象物の識別構造。5. The security medium according to claim 1, wherein the security medium has a region composed of a polymer cholesteric liquid crystal and a pseudo region arranged in accordance with a predetermined rule, and recognizes the arrangement pattern to identify the authenticity of the object. The object identification structure according to any one of claims 1 to 3, wherein the object is identified.
読み取り、該２値データにより対象物の真正性を識別す
るようになっていることを特徴とする請求項４または請
求項５に記載の対象物の識別構造。6. The object according to claim 4, wherein the arrangement pattern is read as binary data, and the authenticity of the object is identified based on the binary data. Identification structure.
載の識別構造が設けられたことを特徴とする対象物。7. An object provided with the identification structure according to any one of claims 1 to 6.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20313597A JP3652476B2 (en) | 1997-07-29 | 1997-07-29 | Object identification structure and object provided with the structure |
| EP98305901A EP0911758B1 (en) | 1997-07-29 | 1998-07-24 | Optical identification system using cholesteric liquid crystals |
| DE69832574T DE69832574T2 (en) | 1997-07-29 | 1998-07-24 | Optical identification system with cholesteric liquid crystals |
| US09/123,512 US6061122A (en) | 1997-07-29 | 1998-07-28 | Optical identification system using cholesteric liquid crystals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20313597A JP3652476B2 (en) | 1997-07-29 | 1997-07-29 | Object identification structure and object provided with the structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1142875A true JPH1142875A (en) | 1999-02-16 |
| JP3652476B2 JP3652476B2 (en) | 2005-05-25 |
Family
ID=16469001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20313597A Expired - Lifetime JP3652476B2 (en) | 1997-07-29 | 1997-07-29 | Object identification structure and object provided with the structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3652476B2 (en) |
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| WO2002010807A1 (en) * | 2000-07-27 | 2002-02-07 | Shiseido Co., Ltd. | Optical sheets containing cholesteric liquid crystal layer and data recording media, data recording method and data discriminating method by using the same |
| JP2002127647A (en) * | 2000-10-19 | 2002-05-08 | Nhk Spring Co Ltd | Discriminating medium of object and manufacturing method thereof |
| JP2003500665A (en) * | 1999-05-25 | 2003-01-07 | キネティック リミテッド | Special purpose surfaces |
| WO2004102234A1 (en) | 2003-05-16 | 2004-11-25 | Nhk Spring Co., Ltd. | Object identification medium and identification method |
| WO2005002874A1 (en) * | 2003-07-03 | 2005-01-13 | Nippon Oil Corporation | Structure for identifying object and object provided with that structure |
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| US7742136B2 (en) | 2004-11-22 | 2010-06-22 | Nitto Denko Corporation | Manufacturing method for sheet with anti-counterfeit functions |
| JP2007301941A (en) * | 2006-05-15 | 2007-11-22 | Dainippon Printing Co Ltd | Forgery prevention member, security medium, and security-medium authenticity determination method |
| JP2008026958A (en) * | 2006-07-18 | 2008-02-07 | Dainippon Printing Co Ltd | Infrared reflection pattern print transparent sheet |
| JP2010525343A (en) * | 2007-04-24 | 2010-07-22 | シクパ・ホールディング・ソシエテ・アノニム | Method for marking a document or item, method and apparatus for identifying a marked document or item, usage of circularly polarized particles |
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