JPS62206582A - Production of hologram - Google Patents
Production of hologramInfo
- Publication number
- JPS62206582A JPS62206582A JP4856386A JP4856386A JPS62206582A JP S62206582 A JPS62206582 A JP S62206582A JP 4856386 A JP4856386 A JP 4856386A JP 4856386 A JP4856386 A JP 4856386A JP S62206582 A JPS62206582 A JP S62206582A
- Authority
- JP
- Japan
- Prior art keywords
- hologram
- light
- photographed
- patterns
- photosensitive materials
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000000463 material Substances 0.000 claims abstract description 20
- 238000011161 development Methods 0.000 claims description 8
- 230000002452 interceptive effect Effects 0.000 claims description 3
- 230000001427 coherent effect Effects 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000004907 flux Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 9
- 230000000007 visual effect Effects 0.000 description 9
- 230000035807 sensation Effects 0.000 description 8
- 230000018109 developmental process Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 206010027439 Metal poisoning Diseases 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 208000008127 lead poisoning Diseases 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000001454 recorded image Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Holo Graphy (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はホログラム製造方法に関し、更に詳しくは優れ
た立体感とともに、観察角度によって明瞭な種々の異な
る視感を与えるホログラムを提供する方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for manufacturing a hologram, and more particularly to a method for providing a hologram that provides an excellent three-dimensional effect and a variety of distinct visual sensations depending on the viewing angle.
（従来の技術）
従来、情報光と参照光とを干渉させて得られる干渉縞を
感光材料に記録した透過型および反射型の各種ホログラ
ムは公知であり、各種情報の記録、再生、更には反射型
の場合には種々の装飾材料等としても使用されている。(Prior Art) Conventionally, various types of transmission and reflection holograms are known, in which interference fringes obtained by interfering information light and reference light are recorded on a photosensitive material. In the case of molds, it is also used as various decorative materials.
これらのホログラムはいずれの型においても、記録画像
を立体的に再生し得る点が最大の特徴であり、従来の平
板的な画像と大いに異なるものである。The greatest feature of any of these holograms is that they can reproduce recorded images three-dimensionally, which is very different from conventional flat images.
（発明が解決しようとしている問題点）上記一般的なホ
ログラム画像は、立体感には優れるものの、画像自体が
別の画像に変化するということは不可能であり、この点
においてホログラム画像には限界があった。(Problem to be solved by the invention) Although the above-mentioned general hologram image has excellent three-dimensional effect, it is impossible for the image itself to change into another image, and in this respect, hologram images have limitations. was there.
従って、１個のホログラムであっても画像が変化するよ
うなものは従来全く知られておらず、このような可変画
像の形成が実現されれば、更にホログラムの用途の拡大
が期待される。Therefore, a hologram in which the image of even a single hologram changes has not been known at all, and if the formation of such a variable image is realized, it is expected that the uses of holograms will further expand.
本発明者は、上記の如く、従来全く知られていないホロ
グラム、すなわち１個のホログラムであっても、看者の
見る角度を変化させるのみで別の画像が生じるようなホ
ログラムを得るべく鋭意研究の結果、ホログラム製造方
法に際し、特定の被撮影体を採用することによって、本
発明の目的が達成されることを知見した。As mentioned above, the present inventor has conducted extensive research in order to obtain a hologram that was completely unknown in the past, that is, a hologram in which a different image is generated simply by changing the viewing angle of a single hologram. As a result, it has been found that the object of the present invention can be achieved by employing a specific object to be photographed in a hologram manufacturing method.
（問題点を解決するための手段）
すなわち、本発明は、撮影用光を被撮影体に照射して得
られる情報光と、該情報光と可干渉性の参照光とを干渉
させて得られる干渉縞を感光材料に露光し、しかる後現
像を施すホログラム製造方法において、被撮・形体が相
互にモアレ現象を示す複数の図形であることを特徴とす
るホログラム製造方法である。(Means for Solving the Problems) That is, the present invention provides information light obtained by irradiating a photographic object with photographing light, and a coherent reference light obtained by interfering with the information light. This hologram manufacturing method involves exposing a photosensitive material to interference fringes and then developing it, in which the objects to be imaged are a plurality of figures that mutually exhibit a moiré phenomenon.
次に本発明を添付図面を参照して更に詳細に説明する。The present invention will now be described in more detail with reference to the accompanying drawings.
本発明において使用するホログラム製造方法の各操作は
、いずれも従来公知のホログラム製造方法と同様であり
、従来公知のホログラム。Each operation of the hologram manufacturing method used in the present invention is the same as that of a conventionally known hologram manufacturing method.
例えば、フルネル示ログラム、フーリエ変換ホログラム
、フラウンホーファーホログラム等のホログラムの製造
方法、これらのホログラムの形式を利用したイメージホ
ログラム、レインボーホログラム、ホログラフィックス
ステレオグラム等のホログラム製造方法はいずれも本発
明において使用できるものである。For example, methods for manufacturing holograms such as Fournel holograms, Fourier transform holograms, and Fraunhofer holograms, and methods for manufacturing holograms such as image holograms, rainbow holograms, and holographic stereograms using these hologram formats are all used in the present invention. It is possible.
その１例を第１図を参照して説明すると、例えば、第１
図において、光源１を発した撮影用光２は、ハーフミラ
−３により２光束に分割され、一方の光はミラー４およ
びレンズ５ａを経て被撮影体６を透過あるいは反射して
情報光７として感光材料８に到達する。また他方の光は
、ミラー３およびレンズ５ｂを経て感光材料８に参照光
９として到達する。これらの情報光７および参照光９は
感光材料８上で干渉し、干渉によって得られる干渉光が
感光材料８に露光され、被撮影体６が撮影される。この
感光材料８を常法に従って現像することによって所望の
ホログラムが形成される。An example of this will be explained with reference to FIG.
In the figure, photographing light 2 emitted from a light source 1 is split into two beams by a half mirror 3, and one of the lights passes through a mirror 4 and a lens 5a, passes through or reflects an object 6, and is exposed as information light 7. Material 8 is reached. The other light reaches the photosensitive material 8 as a reference light 9 via the mirror 3 and the lens 5b. The information light 7 and the reference light 9 interfere on the photosensitive material 8, and the photosensitive material 8 is exposed to the interference light obtained by the interference, and the subject 6 is photographed. A desired hologram is formed by developing this photosensitive material 8 according to a conventional method.
上記においては２個の被撮影体を使用したが、これに代
えて１個の被撮影体を位置をずらして２回使用しても同
様なホログラムが形成できる。Although two photographed objects were used in the above example, a similar hologram can also be formed by using one photographed object twice at different positions.
これらのホログラムは、そのままでは一般的な透過型の
ホログラムであり１反射型のホログラムを必要とする場
合には、得られたホログラムの一方の面に反射性の金属
層を形成すればよい、また、これらのホログラムの複製
が必要な場合には、ホログラムの凹凸形状面に金属層を
形成し。These holograms are general transmission holograms as they are, but if a reflection type hologram is required, a reflective metal layer may be formed on one surface of the obtained hologram, or If it is necessary to duplicate these holograms, a metal layer is formed on the uneven surface of the hologram.
これを金型として他の熟成形性を有する材料にその凹凸
形状を転写すればよい。This may be used as a mold to transfer the concavo-convex shape to another material having aging formability.
本発明の主たる特徴は、上記例示のホログラム製造方法
あるいは例示以外のホログラム製造方法における被撮影
体として、モアレ現像を生じる複数の画像６ａおよび６
ｂ（図形）を採用した点にある。また複数の画像に代え
て、１個の反射型画像を２回使用してもよい、この場合
には、まず１個の画像を６ａまたは６ｂの位置において
最初の露光を行い、次に該画像を６ｂまたは６ａの位置
にずらして第２回目の露光を行っても同様の効果を奏す
る。The main feature of the present invention is that a plurality of images 6a and 6 that cause moiré development are used as objects to be photographed in the above-mentioned hologram manufacturing method or other hologram manufacturing methods.
The point lies in the adoption of b (shape). Also, instead of multiple images, one reflective image may be used twice, in which case the first exposure of one image is made at position 6a or 6b, and then the image is The same effect can be obtained even if the second exposure is performed by shifting the light to the position 6b or 6a.
モアレ現像とは、印刷技術分野等において周知の現像′
であり、１例として第２図および第３図に示す如く、多
数の線または点からなる図形（第１図）を同一または異
なる多数の線または点からなる図形に重ねることにより
、その重ね方に応じて元のいずれの図形とも異なる模様
（第３ａおよび第３ｂ図）が視感できる現象を云うもの
であり、このようなモアレ現像を生じる模様は、第２図
および第３図に示す以外にも無数に存在するものであり
、いずれも本発明において使用できるものである。Moiré development is a well-known development process in the printing technology field.
As an example, as shown in Figures 2 and 3, a figure consisting of many lines or points (Figure 1) can be overlapped with a figure consisting of the same or different lines or points. This refers to a phenomenon in which a pattern (Figs. 3a and 3b) that differs from any of the original figures can be visually perceived depending on the pattern, and patterns that cause such moiré development are those other than those shown in Figs. 2 and 3. There are countless examples of these, and any of them can be used in the present invention.
本発明においては、このようにモアレ現像を生じる２個
の図形（６ａおよび６ｂ）を、第１図示の如くある程度
の距ＩＩ（例えば、数層■〜数ｍ）を置いて、被撮影体
６として使用するものである。In the present invention, the two figures (6a and 6b) that cause moire development in this way are placed at a certain distance II (for example, several layers to several meters) as shown in the first figure, and placed on the subject 6. It is used as a.
また、前記の如く１個の図形を２回使用しても同効であ
る。Further, even if one figure is used twice as described above, the same effect can be obtained.
このようなモアレ現像を生じる被撮影体を従来公知のい
ずれかのホログラム製造方法の被撮影体と使用すること
によって、これら２個の図形が立体的にホログラムとし
て感光材料中に記録され所望のホログラムが得られる。By using an object to be photographed that causes such moiré development as an object to be photographed by any of the conventionally known hologram manufacturing methods, these two figures are three-dimensionally recorded as a hologram in the photosensitive material, and a desired hologram is created. is obtained.
（作用・効果）
以上の如く本発明により得られるホログラムに再生光を
照射したり、あるいはホログラムの裏面に反射層を設け
るなどして、ホログラムを観察すると、図形６ａと図形
６ｂとが立体的に再生されるために、ホログラムを垂直
の角度で観察すると、第２図示の如く図形６ａと図形６
ｂとは完全に一致しているため、観察される図形は第１
図の如くであり、次にホログラムをある別の角度で観察
すると、例えば、第３ａ図の如く、元の図形のいずれに
もない模様が観察されることになり、更に角度を変えて
観察すると、例えば、第３ｂ図の如く、元のいずれの模
様とも異なり、更に第３ａ図の模様とも異なる模様が観
察されることになる。(Function/Effect) As described above, when the hologram obtained by the present invention is irradiated with reproduction light or a reflective layer is provided on the back surface of the hologram and the hologram is observed, the figure 6a and the figure 6b appear three-dimensionally. When the hologram is observed at a vertical angle to be reproduced, the figure 6a and the figure 6 are shown in the second figure.
Since it completely matches b, the observed figure is the first one.
If you then observe the hologram from a different angle, you will see a pattern that does not exist in any of the original shapes, as shown in Figure 3a, and if you observe it from a different angle, For example, a pattern as shown in FIG. 3b will be observed, which is different from any of the original patterns and also different from the pattern shown in FIG. 3a.
以上の例は、本発明を説明するために単に例示したもの
であり、本発明において被撮影体として使用できるモア
レ現像を生じる図形は、第２図および第３図の例に限定
されず１曲線と直線、直線同士、線の太さの異なる曲線
および直線、あるいはこれらの線が点線であるもの、更
にランダムな点の集合であるもの等いずれの組合せでも
可能であり、更に組合せる図形は互いに同一でも異なる
図形でもよく、更に組合せる図形の数は２個に限定され
ず、３個以上でも全く同様の効果を奏することができ、
更に、１個の図形の場合にはこの図形を複数回撮影すれ
ばよく、回数を多くすれば一層複雑且つ多彩な異なる視
感を与えることができる。The above examples are merely exemplified to explain the present invention, and figures that can be used as objects to be photographed in the present invention and that cause moiré development are not limited to the examples shown in FIGS. 2 and 3, but include one curve. Any combination is possible, such as straight lines, straight lines, curves and straight lines with different line thicknesses, dotted lines, or a collection of random points, and the shapes to be combined can be They may be the same or different shapes, and the number of shapes that can be combined is not limited to two, and the same effect can be achieved with three or more shapes.
Furthermore, in the case of one figure, it is sufficient to photograph the figure multiple times, and the more times the figure is photographed, the more complex and various different visual impressions can be provided.
従って、以上の如き本発明によれば、従来のホログラム
は、立体的視感を与えるものの、その視感自体は変化す
ることは無かったのに対し、本発明によるホログラムは
、観察する角度によって、立体感はもとより、全く異な
る多数の模様を現出できるものであり、従来のホログラ
ムでは達成し得ない優れた視感を与えるものである。Therefore, according to the present invention as described above, although the conventional hologram gives a three-dimensional visual sensation, the visual sensation itself does not change, whereas the hologram according to the present invention provides a three-dimensional visual sensation, but the visual sensation itself does not change. It is capable of producing not only a three-dimensional effect but also many completely different patterns, giving an excellent visual sensation that cannot be achieved with conventional holograms.
以上の如き本発明によるホログラムは、上記の如き特異
な視感を与えることから、特に装飾材等として有用であ
り、例えば、株券、商品券、ギフト券、小切手、社債券
、切手、印紙、手形、各種証明用カード、通帳、会員券
、招待券、入場券、図書券、ビール券、抽選券、宝くじ
券、航空券、乗車鉛毒、保険証書、その他の有価証券類
、あるいは更にラベル、伝票の一部に貼着あるいは組み
込むことによって、それらの物品に優れた装飾性を与え
ることができ、またこのような本発明のホログラムは、
複写すると本発明のホログラムの上記の如き作用効果を
全く失うことになるので、重要書類や重要物件の偽造防
止にも有効である。The hologram according to the present invention as described above provides the above-mentioned unique visual sensation and is therefore particularly useful as a decorative material, etc., such as stock certificates, gift certificates, gift certificates, checks, corporate bonds, stamps, stamps, bills, etc. , various identification cards, bankbooks, membership tickets, invitation tickets, admission tickets, book tickets, beer tickets, lottery tickets, lottery tickets, airline tickets, lead poisoning, insurance certificates, other securities, and even labels and slips. The hologram of the present invention can be attached to or incorporated into a part of the object to impart excellent decorative properties to the object.
Since the above-mentioned effects of the hologram of the present invention are completely lost when it is copied, it is also effective in preventing counterfeiting of important documents and objects.
次に実施例を挙げて本発明を更に具体的に説明する。Next, the present invention will be explained in more detail with reference to Examples.
実施例１
この実施例の被撮影体としては、第２図示の如き同心円
図形を有する反射型原稿（６ａ）と同一の同心円図形を
有する透過型原稿（６ｂ）を用意し、反射型原稿を後方
に、且つ透過型原稿を１０１０ｌ１前方に配置して使用
する。Example 1 As objects to be photographed in this example, a reflective original (6a) having a concentric circle figure as shown in the second figure and a transmission type original (6b) having the same concentric circle figure are prepared. In addition, the transmissive original is placed in front of 1010l1.
第１図に示す如き配置のアルゴンレーザー、ビームスプ
リッタ−、ミラーおよびレンズを用いて、感光材料（ジ
プレー社製、ＡＺ−１３５０Ｊ）をガラス基板に厚み２
．５＃Ｌｍに塗布してなる乾板に、上記の被撮影体をフ
ルネルホログラムとして撮影後、所定の現像液（シブレ
ー社製、ＡＺデベロッハー）により現像し、レリーフホ
ログラム化した後、ホログラム面に銀を用いて厚みが４
００オングストロームとなるように蒸着し、更に銀蒸着
膜を電極として厚みが１ｍｓになるようにニッケルをメ
ッキし、剥離してレリーフホログラムの逆型形状の金型
を作成した。Using an argon laser, beam splitter, mirror, and lens arranged as shown in Figure 1, a photosensitive material (AZ-1350J manufactured by Zipley) was deposited on a glass substrate to a thickness of 2.
．． After photographing the above-mentioned object as a Fournel hologram on a dry plate coated with 5#Lm, it was developed with a prescribed developer (AZ Developer, manufactured by Sibley) to form a relief hologram, and then silver was applied to the hologram surface. The thickness is 4 using
00 angstroms, and further plated with nickel to a thickness of 1 ms using the silver evaporated film as an electrode, and then peeled off to create a mold in the reverse shape of a relief hologram.
別に基材として厚み０．４醜脂のポリ塩化ビニルシート
にアルミニウムを厚み５００オングストロームになるよ
うに蒸着し、この蒸着面に前記のレリーフホログラムの
逆型形状の金型の金型面を重ね、基材側に鏡面板を重ね
て熱プレスを用いて１５０℃、圧力１０ｋｇ／ｃゴ、５
分間の条件で加熱および加圧した後冷却し、反射型のレ
リーフホログラムを得た。このホログラムを正面から観
察すると第２図示の如き視感を与えるが、観察角度を変
えることにより、第３ａ図および第３ｂ図の如くその観
察角度によって各々異なる模様が観察された。Separately, aluminum was vapor-deposited to a thickness of 500 angstroms on a polyvinyl chloride sheet with a thickness of 0.4 ugliness as a base material, and the mold surface of the mold in the inverted shape of the relief hologram was placed on this vapor-deposited surface. Layer the mirror plate on the base material side and use a heat press at 150℃, pressure 10kg/c, 5
After being heated and pressurized for 1 minute, it was cooled to obtain a reflection type relief hologram. When this hologram is viewed from the front, it gives a visual sensation as shown in the second figure, but by changing the viewing angle, different patterns can be observed depending on the viewing angle, as shown in Figures 3a and 3b.
実施例２
実施例１における反射型原稿を使用し、この原稿で６ｂ
の位置で第１回目の露光を行い、次いで同じ原稿を６ａ
の位置をずらして第２回目の露光を行い、他は実施例１
と同様にしてホログラムを形成した。このホログラムも
実施例１と同様な効果を示した。Example 2 The reflective type original in Example 1 was used, and 6b
The first exposure is performed at the position 6a, and then the same document is exposed at 6a.
A second exposure was performed by shifting the position of
A hologram was formed in the same manner. This hologram also showed the same effect as Example 1.
第１図は、本発明のホログラム製造方法を図解的に示す
図であり、且つ第２図および第３図は、本発明で使用す
る被撮影体の１例と１本発明の効果を図解的に示す図で
ある。
１；光源 ２；撮影光
３：ハーフミラ−４；ミラー
５；レンズ ６；被撮影体
７：情報光 ８；感光材料
９；参照光
第１図FIG. 1 is a diagram schematically showing the hologram manufacturing method of the present invention, and FIGS. FIG. 1; Light source 2; Photographing light 3: Half mirror 4; Mirror 5; Lens 6; Subject 7: Information light 8; Photosensitive material 9; Reference light FIG.
Claims (2)
と、該情報光と可干渉性の参照光とを干渉させて得られ
る干渉縞を感光材料に露光し、しかる後現像を施すホロ
グラム製造方法において、被撮影体が相互にモアレ現象
を示す複数の図形であることを特徴とするホログラム製
造方法。(1) Information light obtained by irradiating a photographic object with photographic light and interference fringes obtained by interfering the information light with a coherent reference light are exposed onto a photosensitive material, and then developed. A hologram manufacturing method according to the present invention, wherein the object to be photographed is a plurality of figures that mutually exhibit a moiré phenomenon.
または異なる図形である特許請求の範囲第（１）項に記
載のホログラム製造方法。(2) The hologram manufacturing method according to claim (1), wherein the objects to be photographed are a plurality of identical or different figures that mutually exhibit moiré development.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61048563A JP2533835B2 (en) | 1986-03-07 | 1986-03-07 | hologram |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61048563A JP2533835B2 (en) | 1986-03-07 | 1986-03-07 | hologram |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62206582A true JPS62206582A (en) | 1987-09-11 |
| JP2533835B2 JP2533835B2 (en) | 1996-09-11 |
Family
ID=12806855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61048563A Expired - Lifetime JP2533835B2 (en) | 1986-03-07 | 1986-03-07 | hologram |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2533835B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01142589A (en) * | 1987-11-28 | 1989-06-05 | Toppan Printing Co Ltd | Production of multi-layered plane type rainbow hologram |
| WO1993024333A1 (en) * | 1992-05-26 | 1993-12-09 | De La Rue Holographics Limited | Holographic security device |
| US8956786B2 (en) | 2002-07-09 | 2015-02-17 | Dai Nippon Printing Co., Ltd. | Volume hologram medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5194858A (en) * | 1975-02-18 | 1976-08-19 | ||
| JPS5493400A (en) * | 1977-09-09 | 1979-07-24 | Bergkvist Lars A | Screen device occurring moire |
-
1986
- 1986-03-07 JP JP61048563A patent/JP2533835B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5194858A (en) * | 1975-02-18 | 1976-08-19 | ||
| JPS5493400A (en) * | 1977-09-09 | 1979-07-24 | Bergkvist Lars A | Screen device occurring moire |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01142589A (en) * | 1987-11-28 | 1989-06-05 | Toppan Printing Co Ltd | Production of multi-layered plane type rainbow hologram |
| WO1993024333A1 (en) * | 1992-05-26 | 1993-12-09 | De La Rue Holographics Limited | Holographic security device |
| US5694229A (en) * | 1992-05-26 | 1997-12-02 | De La Rue Holographics Limited | Holographic security device |
| US8956786B2 (en) | 2002-07-09 | 2015-02-17 | Dai Nippon Printing Co., Ltd. | Volume hologram medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2533835B2 (en) | 1996-09-11 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |