JP2000250389A - Forgery preventing medium - Google Patents
Forgery preventing mediumInfo
- Publication number
- JP2000250389A JP2000250389A JP5719699A JP5719699A JP2000250389A JP 2000250389 A JP2000250389 A JP 2000250389A JP 5719699 A JP5719699 A JP 5719699A JP 5719699 A JP5719699 A JP 5719699A JP 2000250389 A JP2000250389 A JP 2000250389A
- Authority
- JP
- Japan
- Prior art keywords
- light
- layer
- hologram
- diffraction pattern
- information
- 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
- 238000009792 diffusion process Methods 0.000 claims abstract description 37
- 239000010409 thin film Substances 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 17
- 230000002265 prevention Effects 0.000 claims description 16
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 description 13
- -1 argon ion Chemical class 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000004061 bleaching Methods 0.000 description 3
- 239000005338 frosted glass Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229920005992 thermoplastic resin Polymers 0.000 description 3
- 238000004049 embossing Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000003384 imaging method Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 108010010803 Gelatin Proteins 0.000 description 1
- 101000580748 Homo sapiens Pre-mRNA-splicing factor RBM22 Proteins 0.000 description 1
- 102100027481 Pre-mRNA-splicing factor RBM22 Human genes 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- SOCTUWSJJQCPFX-UHFFFAOYSA-N dichromate(2-) Chemical compound [O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O SOCTUWSJJQCPFX-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000008273 gelatin Substances 0.000 description 1
- 229920000159 gelatin Polymers 0.000 description 1
- 235000019322 gelatine Nutrition 0.000 description 1
- 235000011852 gelatine desserts Nutrition 0.000 description 1
- 239000005337 ground glass Substances 0.000 description 1
- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical compound [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 description 1
- 229910052743 krypton Inorganic materials 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- GGCZERPQGJTIQP-UHFFFAOYSA-N sodium;9,10-dioxoanthracene-2-sulfonic acid Chemical compound [Na+].C1=CC=C2C(=O)C3=CC(S(=O)(=O)O)=CC=C3C(=O)C2=C1 GGCZERPQGJTIQP-UHFFFAOYSA-N 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/0005—Adaptation of holography to specific applications
- G03H1/0011—Adaptation of holography to specific applications for security or authentication
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
- G03H1/0252—Laminate comprising a hologram layer
- G03H1/0256—Laminate comprising a hologram layer having specific functional layer
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2223/00—Optical components
- G03H2223/14—Diffuser, e.g. lens array, random phase mask
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H2250/00—Laminate comprising a hologram layer
- G03H2250/42—Reflective layer
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、金券、有価証券な
どに、複写による偽造を防止する偽造防止媒体に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-counterfeiting medium for preventing counterfeiting of gold notes, securities and the like by copying.
【０００２】[0002]
【従来の技術】従来より、複写装置の性能の向上に伴
い、金券，有価証券などの複写物による不正使用（偽
造）が増加してきており、その対策が望まれている。複
写物であることが判別できるようにする対策として、ホ
ログラムや回折格子を用いた複写防止に係る提案とし
て、特開平１０−２７８４６２号公報が公知である。2. Description of the Related Art Hitherto, with the improvement of the performance of copying apparatuses, illegal use (forgery) of copies such as gold notes and securities has been increasing, and a countermeasure is desired. JP-A-10-278462 is known as a proposal for preventing copying using a hologram or a diffraction grating as a measure for making it possible to determine that the copy is a copy.
【０００３】上記公報により開示された提案は、基材の
印刷層面にホログラム層を部分的に形成することによ
り、複写装置により複写してもホログラム層が再現不可
能なため、偽造できないようにしている。[0003] The proposal disclosed in the above publication discloses that a hologram layer is partially formed on a printing layer surface of a base material, so that the hologram layer cannot be reproduced even when copied by a copying apparatus, so that forgery cannot be performed. I have.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記の提案
は、複写装置によって複写された複写物にはホログラム
層からの回折光が複写され、ホログラム層の何らかの情
報が複写されるので、明白に複写物であると判断できな
いという問題点があった。However, the above-mentioned proposal clearly discloses that a copy copied by a copying apparatus has a structure in which diffracted light from the hologram layer is copied and some information of the hologram layer is copied. There was a problem that it was not possible to judge it as an object.
【０００５】これに対して、本発明では、基材表面に偽
造防止媒体として、反射性金属薄膜層を有した所定の情
報を表示するホログラムあるいは回折格子からなる光回
折パターン情報層を形成する場合に、光回折パターン情
報層の表面に適用するだけで、複写装置により複写を行
なっても、複写物からは光回折パターン情報層による情
報を完全には再現されないような偽造防止媒体として提
供することを目的とする。特に、ホログラム自体の存在
を知らない人でも複写物であることが確実に判別できる
ような複写防止媒体を提供することを目的とする。On the other hand, in the present invention, when a light diffraction pattern information layer made of a hologram or a diffraction grating having a reflective metal thin film layer and displaying predetermined information is formed as a forgery prevention medium on a substrate surface. In addition, it is necessary to provide an anti-counterfeit medium so that the information obtained by the light diffraction pattern information layer is not completely reproduced from the copy even if it is copied by a copying machine only by applying to the surface of the light diffraction pattern information layer. With the goal. In particular, it is an object of the present invention to provide a copy prevention medium that allows a person who does not know the existence of the hologram itself to reliably determine that the copy is a copy.
【０００６】[0006]
【課題を解決するための手段】前記課題を解決するため
に、請求項１記載の発明は、基材と、基材上に形成され
た、反射性金属薄膜層と所定の情報を表示するホログラ
ムあるいは回折格子からなる光回折パターン情報層とを
備える偽造防止媒体において、前記光回折パターン層の
前面に角度選択性を有する光拡散層を配置したことを特
徴とする偽造防止媒体である。According to a first aspect of the present invention, there is provided a hologram for displaying a base material, a reflective metal thin film layer formed on the base material, and predetermined information. Alternatively, a forgery prevention medium comprising a light diffraction pattern information layer comprising a diffraction grating, wherein a light diffusion layer having an angle selectivity is arranged in front of the light diffraction pattern layer.
【０００７】請求項２記載の発明は、請求項１記載の偽
造防止媒体において、前記角度選択性を有した光拡散層
が、複写物であるという明確な情報を含んだ光拡散層で
あるということを特徴とする。According to a second aspect of the present invention, in the anti-counterfeit medium according to the first aspect, the light diffusing layer having the angle selectivity is a light diffusing layer containing clear information that the object is a copy. It is characterized by the following.
【０００８】請求項３記載の発明は、請求項１〜２に記
載の何れかの偽造防止媒体において、前記角度選択性を
有する光拡散層は、ホログラム撮影記録されてなること
を特徴とする。According to a third aspect of the present invention, in the forgery prevention medium according to any one of the first and second aspects, the light diffusion layer having the angle selectivity is formed by holographic imaging and recording.
【０００９】請求項４記載の発明は、請求項１〜３に記
載の何れかの偽造防止媒体において、前記角度選択性を
有する光拡散層が、体積位相透過型ホログラムであるこ
とを特徴とする。According to a fourth aspect of the present invention, in the forgery prevention medium according to any one of the first to third aspects, the light diffusion layer having the angle selectivity is a volume phase transmission hologram. .
【００１０】請求項５記載の発明は、請求項１〜３に記
載の何れかの偽造防止媒体において、前記角度選択性を
有する光拡散層が、表面レリーフホログラムであること
を特徴とする。According to a fifth aspect of the present invention, in the anti-counterfeit medium according to any one of the first to third aspects, the light diffusion layer having the angle selectivity is a surface relief hologram.
【００１１】＜作用＞本発明による偽造防止媒体は、図
1に示すように、反射性金属薄膜層３を有した所定の情
報を表示するホログラムあるいは回折格子からなる光回
折パターン情報層４の前面に、角度選択性を有した光拡
散層５を配置することにより、偽造防止媒体９の前面よ
り光拡散層５を透過して入射する光は透明シートを透過
するように拡散せずに透過して反射性金属薄膜層３に達
し、反射性金属薄膜層３で反射されて光拡散層５を透過
して前面に出射する光は、光透過性の光拡散シートを透
過する時のような光拡散を生じる。ある所定の入射角度
で入射した光は、光回折パターン情報層４からの情報を
表示する領域Ａ６と拡散光を出射する領域Ｂ７に分割し
て光が出射されるため、光回折パターン情報層４からの
情報を視覚することを困難にすることがない。また、領
域Ａ６と領域Ｂ７をほぼ連続的に分割することにより、
光回折パターン情報と拡散光が各領域の境界で大きく変
化するように視覚されるので、偽造品でないという判別
がしやすい。（請求項1）<Operation> The forgery prevention medium according to the present invention is shown in FIG.
As shown in FIG. 1, a light diffusing layer 5 having an angle selectivity is arranged on the front surface of a light diffraction pattern information layer 4 having a reflective metal thin film layer 3 and displaying a predetermined information and composed of a hologram or a diffraction grating. As a result, the light transmitted through the light diffusion layer 5 from the front surface of the anti-counterfeit medium 9 and transmitted through the transparent sheet without being diffused so as to pass through the transparent sheet, reaches the reflective metal thin film layer 3, and is reflected. The light reflected by 3 and transmitted through the light diffusion layer 5 and emitted to the front surface causes light diffusion as when transmitted through a light transmissive light diffusion sheet. Light incident at a predetermined incident angle is divided into an area A6 for displaying information from the light diffraction pattern information layer 4 and an area B7 for emitting diffused light, and the light is emitted. It does not make it difficult to see information from Also, by dividing the area A6 and the area B7 almost continuously,
Since the light diffraction pattern information and the diffused light are visually perceived as greatly changing at the boundary of each area, it is easy to determine that the light is not a counterfeit. (Claim 1)
【００１２】図２に、一般的な複写装置の光源から感光
ドラムまでの要部の光学系を示す。光源２１から発した
光は、オリジナル台２０の複写原稿を照明し、原稿から
の反射光は全速ミラー２２を経由して半速ミラー２３へ
と導かれる。全速ミラー２２は光源２１とともに移動
し、半速ミラー２３は全速ミラー２２と光源２１の移動
速度の半分の速度で移動する。半速ミラー２３に入射し
た光は、ミラーレンズ２４とミラー２５により感光ドラ
ム２６へ結像される。光源から入射する光が、光拡散層
に垂直な方向（複写装置光軸）に拡散光を出射するた
め、複写装置で複写をした場合、偽造防止媒体が白色に
発色され、観察者は複写物に空白があるように視覚され
る。また、光回折パターン情報層の前面に、複写物であ
るという明確な情報を含んだ形状の光拡散層を配置する
ことにより、複写装置で複写をした場合、その形状が偽
造防止媒体上に白色で発色されるので、観察者には明ら
かに複写物であるという事が認識でき、より高い偽造防
止効果が得られる。（請求項１、２）FIG. 2 shows an optical system of a main part from a light source to a photosensitive drum of a general copying apparatus. The light emitted from the light source 21 illuminates the copy original on the original table 20, and the reflected light from the original is guided to the half speed mirror 23 via the full speed mirror 22. The full-speed mirror 22 moves together with the light source 21, and the half-speed mirror 23 moves at half the moving speed of the full-speed mirror 22 and the light source 21. The light incident on the half-speed mirror 23 is imaged on the photosensitive drum 26 by the mirror lens 24 and the mirror 25. Since the light incident from the light source emits diffused light in the direction perpendicular to the light diffusion layer (the optical axis of the copying apparatus), when copying is performed by the copying apparatus, the forgery prevention medium is colored white, and the observer sees the copy. It looks like there is a space in it. In addition, by arranging a light-diffusing layer in the front of the light diffraction pattern information layer in a shape that includes clear information that the object is a copy, the shape of the light-diffusing layer is white on the forgery-prevention medium when copying is performed by a copying machine. Thus, the observer can clearly recognize that it is a copy, and a higher forgery prevention effect can be obtained. (Claims 1 and 2)
【００１３】光拡散層が、ホログラムである場合には、
その撮影条件に応じて、異方性を持つ光拡散機能を付与
することが可能であり、回折光が拡散出射する範囲（方
向）を縦と横のそれぞれの方向に対して任意に制御する
ことも可能である。（請求項３）When the light diffusion layer is a hologram,
It is possible to provide an anisotropic light diffusion function according to the imaging conditions, and to arbitrarily control the range (direction) in which diffracted light is diffused and emitted in each of the vertical and horizontal directions. Is also possible. (Claim 3)
【００１４】光拡散層が、体積位相透過型ホログラムで
ある場合には、光拡散層への入射光は透過して、出射す
る表示光はホログラムで回折して拡散させるような異方
性を持たせることができると共に、ホログラムが持つ角
度選択性により、特定の入射角度での入射光のみを回折
させることも可能である。（請求項４）When the light diffusion layer is a volume phase transmission type hologram, the light incident on the light diffusion layer is transmitted, and the display light emitted is anisotropically diffracted and diffused by the hologram. In addition to the angle selectivity of the hologram, it is also possible to diffract only incident light at a specific incident angle. (Claim 4)
【００１５】光拡散層が、角度選択性を持つ表面レリー
フホログラムである場合には、マスターホログラムから
おこしたスタンパでの熱可塑性樹脂へのエンボス複製に
より、低コストで光拡散層が量産される。（請求項５）When the light diffusion layer is a surface relief hologram having an angle selectivity, the light diffusion layer can be mass-produced at low cost by emboss copying from a master hologram to a thermoplastic resin using a stamper. (Claim 5)
【００１６】[0016]
【発明の実施の形態】以下、図面を参照して本発明の実
施形態を詳細に説明する。図３および図４は、図１に示
した光拡散層をホログラム記録により作製する光学系の
一例を示した図である。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 3 and FIG. 4 are diagrams showing an example of an optical system for producing the light diffusion layer shown in FIG. 1 by hologram recording.
【００１７】光拡散層への入射光の光軸に対して、光拡
散層からの出射光（拡散光）の光軸がずれるものは、図
３に示すように１つのレーザー光源３０から出射された
レーザービームをビームスプリッタ３１により２つに分
け、一方をすりガラスなどの拡散板３２を照明した拡散
光３３である物体光とし、他方を球面波や平面波である
参照光３４として、その２つの光波の干渉縞をまずホロ
グラム用感光材料３５に記録し、現像漂白処理すること
により作成することができる。In the case where the optical axis of the light (diffused light) emitted from the light diffusion layer is shifted from the optical axis of the light incident on the light diffusion layer, the light is emitted from one laser light source 30 as shown in FIG. The divided laser beam is divided into two by a beam splitter 31, one of which is used as object light which is diffused light 33 illuminating a diffusion plate 32 such as frosted glass, and the other is used as reference light 34 which is a spherical wave or a plane wave. Can be prepared by first recording the interference fringes on the hologram photosensitive material 35 and subjecting it to a development bleaching process.
【００１８】また、光拡散層への入射光の光軸と光拡散
層からの出射光（拡散光）の光軸が同じであるものは、
図４に示すように、図３のように作成したマスターホロ
グラム４２を再生して拡散板の像をホログラム用感光材
料４５上に結像し、また再生光４３の光軸と参照光４３
の光軸を一致させた参照光４３でホログラム用感光材料
４５を照明して、再度ホログラフィックな撮影記録を行
い、それを現像漂白処理することにより作成することが
できる。In addition, the optical axis of the light incident on the light diffusion layer and the optical axis of the light emitted from the light diffusion layer (diffused light) are the same.
As shown in FIG. 4, the master hologram 42 formed as shown in FIG. 3 is reproduced to form an image of the diffusion plate on the hologram photosensitive material 45, and the optical axis of the reproduction light 43 and the reference light 43
The holographic photosensitive material 45 is illuminated with the reference light 43 having the same optical axis as described above, holographic photographing and recording is performed again, and the holographic photographing record is developed and bleached.
【００１９】なお、光拡散層に複写物であるという情報
を含ませるには、その情報を含んだマスク板を図３およ
び図４のホログラム感光材料３５、４５の前に配置し
て、上述と同様のホログラム記録を行うことにより作成
することができる。In order for the light diffusion layer to include information that the object is a copy, a mask plate containing the information is arranged in front of the hologram photosensitive materials 35 and 45 shown in FIGS. It can be created by performing similar hologram recording.
【００２０】図３および図４の光学系を用いた上記のよ
うなホログラム記録方法により、光拡散層を作成するこ
とができ、光回折パターン情報層の前面に配置して使用
される。A light diffusion layer can be formed by the above-described hologram recording method using the optical system shown in FIGS. 3 and 4, and is used by being arranged on the front surface of the light diffraction pattern information layer.
【００２１】光拡散性層の作製に使用するアルゴンイオ
ンレーザは、５１４．５ｎｍの波長のレーザ光（緑
色）、４８８ｎｍのレーザー光（青緑色）又は波長４５
７．９ｎｍの波長のレーザ光（青色）を用いることがで
きる。またアルゴンイオンレーザー以外でもコヒーレン
ト性の良いレーザー光源であれば作製可能で、例えばヘ
リウムネオンレーザーやクリプトンイオンレーザーなど
が使用できる。The argon ion laser used for forming the light diffusing layer is a laser beam having a wavelength of 514.5 nm (green), a laser beam of 488 nm (blue-green) or a wavelength of 45 nm.
Laser light (blue) having a wavelength of 7.9 nm can be used. In addition, other than an argon ion laser, a laser light source having good coherence can be produced. For example, a helium neon laser or a krypton ion laser can be used.
【００２２】また、被写体の拡散板３２としては、例え
ば、すりガラスを用い、ホログラム用感光材料３５、４
５としては、例えばアグファゲバルト社製の緑用、青用
のホログラム用銀塩感光材料を用いることができる。As the diffusion plate 32 of the subject, for example, frosted glass is used, and the hologram photosensitive materials 35 and 4 are used.
For example, silver halide photosensitive materials for holograms for green and blue manufactured by Agfagewald can be used as 5.
【００２３】本発明の一実施例では、ホログラム記録方
法により１０００番のすりガラスをアルゴンレーザーの
５１４．５ｎｍの発振光を用いて、アグファゲバルト社
製８Ｅ５６ホログラム用銀塩感光材料に記録した後、現
像にはＣＷＣ２現像液を用い、漂白にはＰＢＱ２漂白液
を用いて現像、漂白、水洗、乾燥を行なったものを、金
属が蒸着された熱可塑性樹脂シートへのエンボス法で複
製したエンボスホログラムに図１のような構成にて実施
した。In one embodiment of the present invention, a hologram recording method is used to record No. 1000 ground glass on a silver halide photosensitive material for 8E56 hologram manufactured by Agfagewald, using an oscillation light of 514.5 nm of an argon laser, and then develop the frosted glass. Developed, bleached, washed with water and dried using a PWC2 bleaching solution for bleaching using a CWC2 developing solution, and embossed holograms were copied by embossing onto a metal-deposited thermoplastic resin sheet. 1 was implemented.
【００２４】また、請求項４に記載の体積位相型ホログ
ラムの場合は上記の銀塩感光材料や重クロム酸ゼラチ
ン、フォトポリマー等を使用して作製される。請求項５
に記載の表面レリーフホログラムの場合は、図３におけ
るホログラム用感光材料４５にフォトレジストを使用し
て作製、あるいはそれを原版（スタンパ）として熱可塑
性樹脂シートへのエンボス法などで複製したエンボスホ
ログラムを使用することができる。Further, in the case of the volume phase type hologram according to the fourth aspect, it is manufactured by using the above-mentioned silver salt photosensitive material, gelatin dichromate, photopolymer and the like. Claim 5
In the case of the surface relief hologram described in (1), an embossed hologram produced by using a photoresist as the hologram photosensitive material 45 in FIG. 3 or replicated by embossing a thermoplastic resin sheet as an original (stamper) is used. Can be used.
【００２５】[0025]
【発明の効果】以上のように、基材とその上に形成され
た、反射性金属薄膜層を有した所定の情報を表示するホ
ログラムあるいは回折格子からなる光回折パターン情報
層とを備える偽造防止媒体において、前記光回折パター
ン層の前面に角度選択性を有した光拡散層を配置したこ
とにより、複写による偽造が妨げられることになる。特
に、複写物の偽造防止媒体部分には、空白あるいは明ら
かに偽造である情報の画像が複写されるので、ホログラ
ムや回折格子からなる光回折パターン情報の存在を知ら
ない人でも、複写物に対して違和感を持って視覚される
ため、複写物であることが判別できるような偽造防止媒
体が提供される。なお、偽造防止が必要な物品として
は、カード、プリペイドカード、商品券、トラベラーズ
チェック、通帳、切符、入場券、名刺などの信用が求め
られるもの全てに適用でき、紙、樹脂、金属材など材質
を問うものではない。As described above, forgery prevention comprising a substrate and a light diffraction pattern information layer comprising a hologram or diffraction grating formed on the substrate and having a reflective metal thin film layer for displaying predetermined information. By disposing a light diffusion layer having an angle selectivity in front of the light diffraction pattern layer in the medium, forgery by copying is prevented. In particular, an image of blank or clearly counterfeit information is copied on the forgery prevention medium portion of the copy, so even those who do not know the existence of light diffraction pattern information consisting of holograms and diffraction gratings can copy the copy. A forgery prevention medium is provided which can be visually recognized with a sense of incongruity and can be identified as a copy. In addition, it is applicable to all items that require credit, such as cards, prepaid cards, gift certificates, traveler's checks, passbooks, tickets, admission tickets, business cards, etc. Do not ask.
【００２６】[0026]
【図１】本発明の偽造防止媒体を概念的に示す説明図。FIG. 1 is an explanatory view conceptually showing a forgery prevention medium of the present invention.
【図２】複写装置の要部の光学系を概略的に示す説明
図。FIG. 2 is an explanatory view schematically showing an optical system of a main part of the copying apparatus.
【図３】光拡散層をホログラム記録により作製する光学
系（１ステップ目）の一例を示す説明図。FIG. 3 is an explanatory view showing an example of an optical system (first step) for producing a light diffusion layer by hologram recording.
【図４】光拡散層をホログラム記録により作製する光学
系（２ステップ目）の一例を示す説明図。FIG. 4 is an explanatory view showing an example of an optical system (second step) for producing a light diffusion layer by hologram recording.
１…基材 ２…入射光 ３…反射性金属薄膜層 ４…光回折パターン情報層 ５…光拡散層 ６…領域Ａ ７…領域Ｂ ８…観察者 ９…偽造防止媒体 ２０…オリジナル台 ２１…光源 ２２…全速ミラー ２３…半速ミラー ２４…ミラーレンズ ２５…ミラー ２６…感光ドラム ３０…レーザー光源 ３１…ビームスプリッタ ３２…拡散板 ３３…拡散光 ３４…参照光 ３５…ホログラム用感光材料 ３６ａ，３６ｂ，３６ｃ，４６ａ，４６ｂ，４６ｃ…反
射鏡 ３7 ａ，３７ｂ，４7 ａ，４７ｂ…空間フィルタ ３8 ａ，３８ｂ，４8 ａ，４８ｂ…レンズ ４０…レーザー光源 ４１…ビームスプリッタ ４２…マスターホログラム ４３…回折光 ４４…参照光 ４５…ホログラム用感光材料DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Incident light 3 ... Reflective metal thin film layer 4 ... Light diffraction pattern information layer 5 ... Light diffusion layer 6 ... Area A 7 ... Area B 8 ... Observer 9 ... Forgery prevention medium 20 ... Original stand 21 ... Light source 22 Full speed mirror 23 Half speed mirror 24 Mirror lens 25 Mirror 26 Photosensitive drum 30 Laser light source 31 Beam splitter 32 Diffusion plate 33 Diffusion light 34 Reference light 35 Photosensitive material for hologram 36a, 36b , 36c, 46a, 46b, 46c: Reflecting mirror 37a, 37b, 47a, 47b: Spatial filter 38a, 38b, 48a, 48b: Lens 40: Laser light source 41: Beam splitter 42: Master hologram 43: Diffracted light 44: Reference light 45: Photosensitive material for hologram
Claims (5)
金属薄膜層と所定の情報を表示するホログラムあるいは
回折格子からなる光回折パターン情報層とを備える偽造
防止媒体において、前記光回折パターン層の前面に角度
選択性を有する光拡散層を配置したことを特徴とする偽
造防止媒体。An anti-counterfeit medium comprising: a base material; a reflective metal thin film layer formed on the base material; and a light diffraction pattern information layer including a hologram or a diffraction grating for displaying predetermined information. An anti-counterfeit medium comprising a light diffusing layer having an angle selectivity disposed in front of a light diffraction pattern layer.
物であるという明確な情報を含んだ光拡散層であるとい
うことを特徴とする請求項１記載の偽造防止媒体。2. An anti-counterfeit medium according to claim 1, wherein said light-diffusing layer having angle selectivity is a light-diffusing layer containing clear information of a copy.
グラム撮影記録されてなることを特徴とする請求項１〜
２に記載の何れかの偽造防止媒体。3. A light diffusion layer having an angle selectivity, wherein a hologram is recorded.
3. The forgery prevention medium according to any of 2.
位相透過型ホログラムであることを特徴とする請求項１
〜３に記載の何れかの偽造防止媒体。4. The hologram according to claim 1, wherein the light diffusion layer having the angle selectivity is a volume phase transmission type hologram.
4. The forgery prevention medium according to any one of items 1 to 3.
レリーフホログラムであることを特徴とする請求項１〜
３に記載の何れかの偽造防止媒体。5. The light diffusing layer having an angle selectivity is a surface relief hologram.
4. A forgery prevention medium according to any one of the above items 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05719699A JP4258055B2 (en) | 1999-03-04 | 1999-03-04 | Anti-counterfeit media |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05719699A JP4258055B2 (en) | 1999-03-04 | 1999-03-04 | Anti-counterfeit media |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000250389A true JP2000250389A (en) | 2000-09-14 |
| JP4258055B2 JP4258055B2 (en) | 2009-04-30 |
Family
ID=13048748
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05719699A Expired - Fee Related JP4258055B2 (en) | 1999-03-04 | 1999-03-04 | Anti-counterfeit media |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4258055B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003012733A1 (en) * | 2001-07-27 | 2003-02-13 | Durand Technology Limited | Security and authentication marking of products |
| JP2006011513A (en) * | 2004-06-22 | 2006-01-12 | Toppan Printing Co Ltd | Verification method of article including blazed grating, device and article |
| JP2012226260A (en) * | 2011-04-22 | 2012-11-15 | Toppan Printing Co Ltd | Forgery prevention medium |
| CN111645436A (en) * | 2020-06-12 | 2020-09-11 | 山东泰宝包装制品有限公司 | Laser encrypted anti-counterfeiting transfer paper and preparation method thereof |
| CN113296177A (en) * | 2021-05-24 | 2021-08-24 | 苏州博瑞塔光电科技有限公司 | Design method of thin film reflective grating |
-
1999
- 1999-03-04 JP JP05719699A patent/JP4258055B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003012733A1 (en) * | 2001-07-27 | 2003-02-13 | Durand Technology Limited | Security and authentication marking of products |
| JP2006011513A (en) * | 2004-06-22 | 2006-01-12 | Toppan Printing Co Ltd | Verification method of article including blazed grating, device and article |
| JP2012226260A (en) * | 2011-04-22 | 2012-11-15 | Toppan Printing Co Ltd | Forgery prevention medium |
| CN111645436A (en) * | 2020-06-12 | 2020-09-11 | 山东泰宝包装制品有限公司 | Laser encrypted anti-counterfeiting transfer paper and preparation method thereof |
| CN113296177A (en) * | 2021-05-24 | 2021-08-24 | 苏州博瑞塔光电科技有限公司 | Design method of thin film reflective grating |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4258055B2 (en) | 2009-04-30 |
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