JPH1097169A - Hologram for preventing duplication - Google Patents
Hologram for preventing duplicationInfo
- Publication number
- JPH1097169A JPH1097169A JP8251470A JP25147096A JPH1097169A JP H1097169 A JPH1097169 A JP H1097169A JP 8251470 A JP8251470 A JP 8251470A JP 25147096 A JP25147096 A JP 25147096A JP H1097169 A JPH1097169 A JP H1097169A
- Authority
- JP
- Japan
- Prior art keywords
- hologram
- light
- duplication
- layer
- reflection
- 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
- 239000000463 material Substances 0.000 description 18
- 238000005286 illumination Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 238000000034 method Methods 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
- G03H1/024—Hologram nature or properties
- G03H1/0248—Volume holograms
-
- 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
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0402—Recording geometries or arrangements
- G03H2001/0415—Recording geometries or arrangements for recording reflection holograms
- G03H2001/0417—Recording geometries or arrangements for recording reflection holograms for recording single beam Lippmann hologram wherein the object is illuminated by reference beam passing through the recording material
-
- 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
Landscapes
- Holo Graphy (AREA)
- Credit Cards Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複製防止ホログラ
ムに関し、特に、身分証明書等に貼着してそのセキュリ
ティー性を高めるために使用される複製防止ホログラム
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-duplication hologram, and more particularly to an anti-duplication hologram that is attached to an identification card or the like and used to enhance security.
【０００２】[0002]
【従来の技術】従来から、ＣＤカード、プリペイドカー
ド、定期券、通帳、パスポート、身分証明書、商品等が
真実なもので偽造されたものでないことを保証するため
に、立体像、模様等を記録したレリーフホログラム又は
リップマンホログラムからなるラベル、シール等を対象
物に貼着することが広く行われている。2. Description of the Related Art Conventionally, in order to ensure that a CD card, a prepaid card, a commuter pass, a passbook, a passport, an identification card, a product, and the like are true and not forged, a three-dimensional image, a pattern, and the like are used. 2. Description of the Related Art Affixing a label, a seal, or the like made of a recorded relief hologram or Lippmann hologram to an object is widely performed.
【０００３】[0003]
【発明が解決しようとする課題】これらのホログラム
は、単純な再生照明光あるいは白色光により再生可能で
あり、これを複製等の手法により偽造することは必ずし
も困難なことではない。そのため、このようなホログラ
ムからなるラベル、シール等のセキュリティー性は必ず
しも高いものではなかった。These holograms can be reproduced by simple reproduction illumination light or white light, and it is not always difficult to forge such a hologram by a method such as duplication. Therefore, the security of labels, seals, and the like made of such holograms is not always high.
【０００４】本発明はこのような従来技術の問題点に鑑
みてなされたものであり、その目的は、複製による偽造
物であることが容易に分かるホログラムを提供すること
である。[0004] The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a hologram that can be easily recognized as a counterfeit by duplication.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成する本発
明の複製防止ホログラムは、リップマンホログラムにお
いて、ホログラム記録層の裏面側に反射層が設けられて
いることを特徴とするものである。According to the present invention, there is provided an anti-duplication hologram according to the present invention, wherein a reflection layer is provided on the back side of a hologram recording layer in a Lippmann hologram.
【０００６】本発明のもう１つの複製防止ホログラム
は、リップマンホログラムにおいて、ホログラム記録層
の裏面側に、ホログラム記録層側から順に、半透過鏡、
透明層、反射層が設けられていることを特徴とするもの
である。Another anti-duplication hologram according to the present invention is a Lippmann hologram, in which a semi-transmissive mirror,
A transparent layer and a reflective layer are provided.
【０００７】この場合、半透過鏡は、ホログラム記録層
と透明層の間のフレネル反射を利用するものであっても
よい。In this case, the semi-transmissive mirror may use the Fresnel reflection between the hologram recording layer and the transparent layer.
【０００８】また、透明層は、位置に応じて厚さが変化
しているものであることが望ましい。Further, it is desirable that the thickness of the transparent layer changes depending on the position.
【０００９】上記の本発明においては、リップマンホロ
グラムのホログラム記録層の裏面側に、反射層あるい
は、半透過鏡、透明層、反射層からなる二重反射層が設
けられているので、元のホログラムと複製ホログラムの
間に、再生像の背景の色の変化具合、再生像の濃度の変
化具合等に差が出るため、対象のホログラムが真正なも
のか複製による偽造物であるかが容易に区別できる。し
たがって、身分証明書等の偽造防止用のホログラムに適
したものである。In the present invention, since a reflection layer or a double reflection layer comprising a semi-transmissive mirror, a transparent layer and a reflection layer is provided on the back side of the hologram recording layer of the Lippmann hologram, the original hologram is provided. There is a difference in the degree of change in the background color of the reconstructed image and the degree of change in the density of the reconstructed image between the hologram and the duplicate hologram. it can. Therefore, it is suitable for a hologram for preventing forgery such as an identification card.
【００１０】[0010]
【発明の実施の形態】次に、本発明の複製防止ホログラ
ムの実施例について説明する。図１に本発明による複製
防止ホログラムの基本的な形態の断面図を示す。このホ
ログラム１０は、フォトポリマー等の厚さの厚いホログ
ラム感光材料１中に体積位相型の干渉縞３が記録され、
感光材料１の裏面にはアルミニウム、誘電体多層反射膜
等の反射層２が設けられてなるものである。Next, an embodiment of the anti-duplication hologram of the present invention will be described. FIG. 1 shows a sectional view of a basic form of a duplication preventing hologram according to the present invention. In this hologram 10, volume phase interference fringes 3 are recorded in a thick hologram photosensitive material 1 such as a photopolymer,
On the back surface of the photosensitive material 1, a reflective layer 2 such as aluminum or a dielectric multilayer reflective film is provided.
【００１１】したがって、周囲の白色光４がこのホログ
ラム１０に入射すると、干渉縞３の再生条件に合致する
角度、波長のものが回折光５として反対方向に回折さ
れ、干渉縞３として記録された模様、立体像等が観察で
きる。干渉縞３の再生条件に合致しない他の波長、角度
の光と０次透過光は反射層２で正反射光６として反射さ
れる。この反射光６は周囲光と略同じ白色光となる。Therefore, when the surrounding white light 4 is incident on the hologram 10, the light having an angle and a wavelength that match the reproduction condition of the interference fringes 3 is diffracted in the opposite direction as the diffracted light 5 and recorded as the interference fringes 3. Patterns, three-dimensional images, etc. can be observed. Light of other wavelengths and angles that do not match the reproduction conditions of the interference fringes 3 and the zero-order transmitted light are reflected as regular reflection light 6 by the reflection layer 2. The reflected light 6 is substantially the same white light as the ambient light.
【００１２】ところで、このようなホログラム１０から
ホログラム複製を行おうとすると、図２（ａ）に示すよ
うに、ホログラム１０の感光材料１側表面に別のフォト
ポリマー等の厚さの厚いホログラム感光材料１１を重ね
合わせて、ホログラム１０の感光材料１中の干渉縞３の
再生条件に合致する角度、波長の再生照明光７を入射さ
せることになる。感光材料１１を介して再生照明光７が
入射すると、干渉縞３によって一部の光は再生光８とし
て反対方向に回折されると共に、干渉縞３によって回折
されなかった成分は反射層２で正反射光９として反射さ
れる。そのため、重ね合わされた感光材料１１中では、
入射光７と再生光８が干渉して干渉縞３と同様な干渉縞
１２が記録されると共に、入射光７と反射光９も干渉し
て感光材料１１の平面に平行な干渉縞１３も記録され
る。再生光８と反射光９も干渉するが強度が弱いので無
視できる。When a hologram is to be copied from such a hologram 10, as shown in FIG. 2A, a thick hologram photosensitive material such as another photopolymer is formed on the surface of the hologram 10 on the photosensitive material 1 side. 11 are superimposed, and the reproduction illumination light 7 having an angle and a wavelength that match the reproduction conditions of the interference fringes 3 in the photosensitive material 1 of the hologram 10 is incident. When the reproduction illumination light 7 enters through the photosensitive material 11, a part of the light is diffracted in the opposite direction as the reproduction light 8 by the interference fringes 3, and the components not diffracted by the interference fringes 3 are corrected by the reflection layer 2. The light is reflected as reflected light 9. Therefore, in the superposed photosensitive material 11,
The incident light 7 and the reproduction light 8 interfere with each other to record an interference fringe 12 similar to the interference fringe 3, and the incident light 7 and the reflected light 9 also interfere with each other to record an interference fringe 13 parallel to the plane of the photosensitive material 11. Is done. The reproduction light 8 and the reflected light 9 also interfere with each other, but can be ignored since the intensity is weak.
【００１３】図２（ｂ）に示すように、このようにして
複製されたホログラム１１’に周囲の白色光１４が入射
すると、干渉縞１２の再生条件に合致する角度、波長の
ものが回折光１５として反対方向に回折され、元のホロ
グラム１０と同様の模様、立体像等が観察できる。同時
に、感光材料１１の平面に平行な干渉縞１３に入射した
光の中、その再生条件に合致する角度、波長の成分が回
折光１６として正反射方向に回折される。この回折光１
６は、元のホログラム１０の正反射光６とは異なり、反
射方向に依存して色が変化するものとなる。したがっ
て、ホログラムによる正反射光の差により、そのホログ
ラムが真正なもの（図１）か複製による偽造物（図２
（ａ））であるか容易に区別できる。また、ホログラム
の裏面を見ることにより、その裏面に反射層２がないに
もかかわらす正反射があれば、偽造物であると判定でき
る。さらには、ホログラムをミクロに分析して、その中
に感光材料の平面に平行な干渉縞１３が記録されていれ
ば、偽造物であると判定できる。As shown in FIG. 2B, when the surrounding white light 14 is incident on the hologram 11 ′ thus copied, the hologram 11 ′ having an angle and wavelength matching the reproduction conditions of the interference fringe 12 is diffracted. 15, the light is diffracted in the opposite direction, and the same pattern, three-dimensional image, and the like as the original hologram 10 can be observed. At the same time, out of the light incident on the interference fringe 13 parallel to the plane of the photosensitive material 11, an angle and a wavelength component that match the reproduction conditions are diffracted in the specular direction as the diffracted light 16. This diffracted light 1
6 differs from the original regular reflection light 6 of the hologram 10 in that the color changes depending on the reflection direction. Therefore, depending on the difference in the regular reflection light from the hologram, the hologram is authentic (FIG. 1) or counterfeit by duplication (FIG. 2).
(A)) can be easily distinguished. In addition, by looking at the back surface of the hologram, if there is regular reflection despite the absence of the reflective layer 2, it can be determined that the hologram is a counterfeit. Furthermore, the hologram is analyzed microscopically, and if interference fringes 13 parallel to the plane of the photosensitive material are recorded therein, it can be determined that the hologram is a counterfeit.
【００１４】図３に本発明による複製防止ホログラムの
変形例の断面図を示す。このホログラム１０’は、フォ
トポリマー等の厚さの厚いホログラム感光材料１中に体
積位相型の干渉縞３が記録され、感光材料１の裏面に
は、波長オーダーの薄い透明層１７と反射層２が順に積
層され、感光材料１と透明層１７の間に半透過鏡２’が
設けられてなるものである。半透過鏡２’としては、金
属蒸着膜あるいは多層膜からなる半透過鏡、あるいは、
感光材料１の屈折率と透明層１７の屈折率とをある程度
異ならせてフレネル反射を利用するものであってもよ
い。FIG. 3 is a sectional view of a modification of the anti-duplication hologram according to the present invention. This hologram 10 ′ has a volume phase interference fringe 3 recorded in a hologram photosensitive material 1 having a large thickness such as a photopolymer, and a transparent layer 17 and a reflective layer 2 having a wavelength order on the back surface of the photosensitive material 1. Are laminated in order, and a semi-transmissive mirror 2 ′ is provided between the photosensitive material 1 and the transparent layer 17. As the semi-transmissive mirror 2 ′, a semi-transmissive mirror made of a metal deposition film or a multilayer film, or
The refractive index of the photosensitive material 1 and the refractive index of the transparent layer 17 may be made different from each other to some extent to utilize Fresnel reflection.
【００１５】このホログラム１０’においては、周囲の
白色光４がこのホログラム１０’に入射すると、干渉縞
３の再生条件に合致する角度、波長のものが回折光５と
して反対方向に回折され、干渉縞３として記録された模
様、立体像等が観察できる。干渉縞３の再生条件に合致
しない他の波長、角度の光と０次透過光の一部は、半透
過鏡２’で正反射光６1 として反射され、残りの部分
は、反射層２で正反射光６2 として反射される。透明層
１７は波長オーダーの薄い層であるので、反射光６1 と
６2 は相互に干渉する。透明層１７が全面が一様に同じ
厚さの場合には、その厚さに応じた位相差で全面一様に
干渉するが、通常若干の厚さの変動があるため、場所に
応じて比較的大きな繰り返しピッチで干渉する波長が異
なり、場所に依存して色が異なることになる。すなわ
ち、このホログラム１０’を回折光５の方向から見る
と、記録された模様、立体像等が観察でき、その背後に
繰り返しピッチの大きい虹色が薄く付くが、それ以外の
方向から見ると、位置毎に異なる薄い虹色に見える。な
お、この虹色は、周囲の白色光４の可干渉性が小さいの
で、余り濃い色にはならず、目立つことはない。In the hologram 10 ', when the surrounding white light 4 is incident on the hologram 10', a light having an angle and a wavelength which match the reproduction condition of the interference fringe 3 is diffracted in the opposite direction as the diffracted light 5, and the interference Patterns, three-dimensional images, and the like recorded as stripes 3 can be observed. Other wavelengths that do not meet the reproduction conditions of the interference fringe 3, is part of the angle of the light and 0-order transmission light is reflected as regular reflection light 61 with semitransparent mirror 2 ', rest, a reflective layer 2 It is reflected as specularly reflected light 6 2. Because the transparent layer 17 is a thin layer of wavelength order, the reflected light 61 and 6 2 interfere with each other. When the entire surface of the transparent layer 17 has the same thickness, the entire surface uniformly interferes with a phase difference corresponding to the thickness. Interfering wavelengths differ with a repetition pitch that is extremely large, and the color differs depending on the location. That is, when the hologram 10 ′ is viewed from the direction of the diffracted light 5, a recorded pattern, a three-dimensional image, or the like can be observed, and a rainbow color having a large repetition pitch is faintly behind the hologram 10 ′. It looks like a light rainbow that varies from position to position. Note that this rainbow color does not become very dark and does not stand out because the coherence of the surrounding white light 4 is small.
【００１６】このようなホログラム１０’から、図２
（ａ）と同様に、ホログラム１０の感光材料１側表面に
別の厚いホログラム感光材料１１を重ね合わせて、ホロ
グラム複製を行うと、図４に示すようなホログラム１
１’が得られる。複製ホログラム１１’には、干渉縞３
と同様な干渉縞１２が記録されていると共に、半透過鏡
２’で反射された光６1 と反射層２で反射された光６2
とによる繰り返しピッチの大きい干渉縞１８が記録され
ている。このホログラム１１’に周囲の白色光１４が入
射すると、干渉縞１２の再生条件に合致する角度、波長
のものが回折光１５として反対方向に回折されるが、干
渉縞１８の低屈折部分から回折される光１５1 とその高
屈折部分から回折される光１５2 との間には、干渉縞１
２の屈折率変調度合いが異なるので、強度の差が存在す
ることになる。したがって、再生される模様、立体像等
の濃度変動と背後の差から、そのホログラムが真正なも
の（図３）か複製による偽造物（図４）であるか容易に
区別できる。すなわち、前者の場合は、その背後に繰り
返しピッチの大きい虹色が薄く付いているのに対し、後
者の場合は、模様、立体像等自体の濃度がホログラムの
位置に応じて薄くなったり濃くなっている。また、ホロ
グラムの裏面を見ることにより、その裏面に反射層２が
ないにもかかわらす正反射があれば、偽造物であると判
定できる。さらには、ホログラムを分析して、その中に
繰り返しピッチの大きい干渉縞１８が記録されていれ
ば、偽造物であると判定できる。From such a hologram 10 ', FIG.
Similarly to FIG. 4A, when another thick hologram photosensitive material 11 is overlaid on the surface of the hologram 10 on the photosensitive material 1 side and the hologram is duplicated, the hologram 1 shown in FIG.
1 ′ is obtained. In the duplicate hologram 11 ', the interference fringes 3
With the same fringe 12 is recorded as a semi-transmissive mirror light 61 reflected by the 2 'and the reflective layer 2 light 6 2 reflected by the
And interference fringes 18 having a large repetition pitch are recorded. When the surrounding white light 14 is incident on the hologram 11 ′, a beam having an angle and a wavelength that match the reproduction condition of the interference fringes 12 is diffracted in the opposite direction as the diffracted light 15, but is diffracted from the low refraction portion of the interference fringes 18. between the light 15 2 diffracted light 15 1 and its high refractive portion that is, the interference fringes 1
Since the two refractive index modulation degrees are different, there is a difference in intensity. Therefore, it is easy to discriminate whether the hologram is a genuine one (FIG. 3) or a duplicated one (FIG. 4) based on the difference between the density of the reproduced pattern and the three-dimensional image and the background. In other words, in the former case, the rainbow color having a large repeated pitch is thinly applied behind the former, whereas in the latter case, the density of the pattern, the stereoscopic image, etc. itself becomes thinner or darker depending on the position of the hologram. ing. In addition, by looking at the back surface of the hologram, if there is regular reflection despite the absence of the reflective layer 2, it can be determined that the hologram is a counterfeit. Furthermore, the hologram is analyzed, and if interference fringes 18 having a large repetition pitch are recorded therein, it can be determined that the hologram is a forgery.
【００１７】以上、本発明の複製防止ホログラムをいく
つかの実施例に基づいて説明してきたが、本発明はこれ
ら実施例に限定されず種々の変形が可能である。Although the anti-duplication hologram of the present invention has been described based on several embodiments, the present invention is not limited to these embodiments, and various modifications are possible.
【００１８】[0018]
【発明の効果】以上の説明から明らかなように、本発明
の複製防止ホログラムによると、リップマンホログラム
のホログラム記録層の裏面側に、反射層あるいは、半透
過鏡、透明層、反射層からなる二重反射層が設けられて
いるので、元のホログラムと複製ホログラムの間に、再
生像の背景の色の変化具合、再生像の濃度の変化具合等
に差が出るため、対象のホログラムが真正なものか複製
による偽造物であるかが容易に区別できる。したがっ
て、身分証明書等の偽造防止用のホログラムに適したも
のである。As is apparent from the above description, according to the anti-duplication hologram of the present invention, the back surface of the hologram recording layer of the Lippmann hologram has a reflective layer or a semi-transmissive mirror, a transparent layer and a reflective layer. Since the double reflection layer is provided, there is a difference between the original hologram and the duplicate hologram in the degree of change in the background color of the reproduced image, the degree of change in the density of the reproduced image, and the like. It can be easily distinguished from a copy or a copy. Therefore, it is suitable for a hologram for preventing forgery such as an identification card.
【図１】本発明による複製防止ホログラムの基本的な形
態の断面図である。FIG. 1 is a cross-sectional view of a basic form of an anti-duplication hologram according to the present invention.
【図２】図１のホログラムを複製する際の配置を示す図
と複製されたホログラムの断面図である。FIG. 2 is a diagram showing an arrangement when the hologram of FIG. 1 is duplicated, and a cross-sectional view of the duplicated hologram.
【図３】本発明による複製防止ホログラムの変形例の断
面図である。FIG. 3 is a sectional view of a modification of the anti-duplication hologram according to the present invention.
【図４】図３のホログラムから複製されたホログラムの
断面図である。FIG. 4 is a sectional view of a hologram copied from the hologram of FIG. 3;
１…ホログラム感光材料 ３…干渉縞 ２…反射層 ２’…半透過鏡 ４…周囲の白色光 ５…回折光 ６、６1 、６2 …正反射光 ７…再生照明光 ８…再生光 ９…正反射光 １０、１０’…ホログラム（本発明） １１…ホログラム感光材料 １１’…複製ホログラム １２、１３…干渉縞 １４…周囲の白色光 １５、１６…回折光 １５1 …低屈折部分から回折される光 １５2 …高屈折部分から回折される光 １７…透明層 １８…干渉縞1 ... hologram photosensitive material 3 ... fringe 2 ... reflective layer 2 '... semitransparent mirror 4 ... white light 5 ... diffracted light 6,6 1 around, 6 2 ... regularly reflected light 7 ... reproduction illumination light 8 ... reproduction beam 9 Specular reflected light 10, 10 'Hologram (the present invention) 11 Hologram photosensitive material 11' Duplicated hologram 12, 13 Interference fringe 14 White light around 16, 15, Diffracted light 15 1 Diffraction from low refraction part Light 15 2 … Light diffracted from the high refraction part 17… Transparent layer 18… Interference fringes
Claims (4)
ラム記録層の裏面側に反射層が設けられていることを特
徴とする複製防止ホログラム。1. An anti-duplication hologram according to claim 1, wherein a reflection layer is provided on the back side of the hologram recording layer in the Lippmann hologram.
ラム記録層の裏面側に、ホログラム記録層側から順に、
半透過鏡、透明層、反射層が設けられていることを特徴
とする複製防止ホログラム。2. In a Lippmann hologram, on the back side of the hologram recording layer, in order from the hologram recording layer side
An anti-duplication hologram comprising a semi-transmissive mirror, a transparent layer, and a reflective layer.
と前記透明層の間のフレネル反射を利用するものである
ことを特徴とする請求項２記載の複製防止ホログラム。3. The anti-duplication hologram according to claim 2, wherein the semi-transmissive mirror utilizes Fresnel reflection between the hologram recording layer and the transparent layer.
ていることを特徴とする請求項２又は３記載の複製防止
ホログラム。4. The anti-duplication hologram according to claim 2, wherein the thickness of the transparent layer changes according to the position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25147096A JP3722316B2 (en) | 1996-09-24 | 1996-09-24 | Anti-hologram |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25147096A JP3722316B2 (en) | 1996-09-24 | 1996-09-24 | Anti-hologram |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1097169A true JPH1097169A (en) | 1998-04-14 |
| JP3722316B2 JP3722316B2 (en) | 2005-11-30 |
Family
ID=17223299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25147096A Expired - Lifetime JP3722316B2 (en) | 1996-09-24 | 1996-09-24 | Anti-hologram |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3722316B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8477315B2 (en) | 2007-02-09 | 2013-07-02 | Seiko Epson Corporation | Volume hologram, light source device, illumination device, monitor, and image display device |
| WO2016143639A1 (en) * | 2015-03-06 | 2016-09-15 | 大日本印刷株式会社 | Hologram laminate, security medium, and method of using hologram laminate |
-
1996
- 1996-09-24 JP JP25147096A patent/JP3722316B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8477315B2 (en) | 2007-02-09 | 2013-07-02 | Seiko Epson Corporation | Volume hologram, light source device, illumination device, monitor, and image display device |
| WO2016143639A1 (en) * | 2015-03-06 | 2016-09-15 | 大日本印刷株式会社 | Hologram laminate, security medium, and method of using hologram laminate |
| JPWO2016143639A1 (en) * | 2015-03-06 | 2017-12-21 | 大日本印刷株式会社 | Hologram laminate, security medium, and method of using hologram laminate |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3722316B2 (en) | 2005-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4832445A (en) | Security diffraction devices difficult to exactly duplicate | |
| EP0548142B2 (en) | Security device | |
| RU2175777C2 (en) | Information medium and device for verifying its authenticity | |
| JPH01246582A (en) | Manufacture of discontinuous hologram and article having discontinuous hologram | |
| US6747768B1 (en) | Information carrier with a hologram | |
| US6271967B1 (en) | Optically diffractive structure | |
| KR20200015350A (en) | Reflective-transmissive type film for preventing counterfeit | |
| JPH0685102B2 (en) | Card with hologram | |
| US9594345B2 (en) | Hybrid reflection hologram | |
| JP4076240B2 (en) | Compound hologram | |
| US20080259417A1 (en) | Holographic Recording Media | |
| KR102009115B1 (en) | Reflective-transmissive type film for preventing counterfeit | |
| US5640255A (en) | Holographic authentication patch | |
| JP3563774B2 (en) | Information recording medium | |
| JP3722316B2 (en) | Anti-hologram | |
| JPH06118864A (en) | Hologram, generating method for its hologram, and method and device for confirmation using same | |
| EP0746472A1 (en) | Diffractive device with enhanced anti-copying protection | |
| JP4580573B2 (en) | Forgery prevention medium and its authenticity discrimination device | |
| JP4258055B2 (en) | Anti-counterfeit media | |
| JP4154738B2 (en) | Two-layer hologram | |
| JP3714432B2 (en) | Hologram display and method for producing the same | |
| JPH0844837A (en) | Medium for certificate and circulating path discriminating method for the same | |
| AU679333B2 (en) | Diffractive device with enhanced anti-copying protection | |
| US20110249307A1 (en) | Hologram and associated methods of fabrication thereof and use in security/authentication applications | |
| Bjelkhagen | New OVDs for personalized documents based on color holography and Lippmann photography |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20050812 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20050907 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20050908 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090922 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090922 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100922 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110922 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110922 Year of fee payment: 6 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120922 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120922 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130922 Year of fee payment: 8 |
|
| EXPY | Cancellation because of completion of term |