JP3431253B2 - Hologram recording method - Google Patents
Hologram recording methodInfo
- Publication number
- JP3431253B2 JP3431253B2 JP00260094A JP260094A JP3431253B2 JP 3431253 B2 JP3431253 B2 JP 3431253B2 JP 00260094 A JP00260094 A JP 00260094A JP 260094 A JP260094 A JP 260094A JP 3431253 B2 JP3431253 B2 JP 3431253B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- hologram recording
- incident
- recording material
- hologram
- 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.)
- Expired - Fee Related
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Description
【０００１】[0001]
【産業上の利用分野】本発明は、ホログラム記録方法に
関し、特に、不要な干渉パターンを低減させ、かつ、撮
影光量の高効率化を図ったホログラム記録方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hologram recording method, and more particularly to a hologram recording method that reduces unnecessary interference patterns and increases the efficiency of photographing light quantity.
【０００２】[0002]
【従来の技術】従来、図３（ａ）に示すように、２つの
光束Ａ、Ｂを記録材料Ｆに入射させて干渉させてホログ
ラム記録する場合も、同図（ｂ）に示すように、ホログ
ラム原版Ｍの上に記録材料Ｆを密着して、記録材料Ｆ側
から１つの光束Ａを入射させ、その入射光Ａと記録材料
Ｆを透過し原版Ｍで回折された回折光Ｃとを干渉させて
ホログラム複製をする場合も、入射光Ａ、Ｂとしては、
通常、干渉成分の大きいＳ偏光を用いていた。その理由
は、Ｓ偏光を用いると、記録材料Ｆ内で２つ光束ＡとＢ
又はＡとＣの電場ベクトル成分が相互に平行になり、干
渉成分が最大になるため、高効率で干渉するからであ
る。2. Description of the Related Art Conventionally, as shown in FIG. 3 (a), when two light beams A and B are made incident on a recording material F and interfere with each other for hologram recording, as shown in FIG. 3 (b), The recording material F is brought into close contact with the hologram master M, one light flux A is made incident from the recording material F side, and the incident light A and the diffracted light C transmitted through the recording material F and diffracted by the master M are interfered with each other. Even when the hologram is duplicated by making the incident lights A and B,
Usually, S-polarized light having a large interference component was used. The reason is that when S-polarized light is used, two light fluxes A and B in the recording material F are obtained.
Alternatively, the electric field vector components of A and C are parallel to each other and the interference component is maximized, so that the interference occurs with high efficiency.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、空気の
ような屈折率ｎ1 の媒質からそれと異なる屈折率ｎ2 の
ホログラム記録材料Ｆへ光が直接入射するとき、記録材
料Ｆ表面でのフレネル反射により入射光Ａ、Ｂの一部が
反射され有効に記録に寄与しない。図４は屈折率ｎ1 ＝
１．０の空気から屈折率ｎ2 ＝１．５の媒質へ入射角θ
1 で光が入射するときのその界面でのエネルギー反射率
Ｒとエネルギー透過率Ｔを表すグラフであり、屈折率ｎ
2 の媒質から屈折率ｎ1 の媒質へ入射するときも同様と
なる。このグラフから明らかなように、光Ａ、ＢがＳ偏
光の場合、記録材料Ｆに入射、出射する際に、Ｐ偏光に
比べて高い反射率を示す。したがって、Ｓ偏光を利用す
る場合、図３のようなホログラム記録、複製時に記録の
低効率化を起こし、また、界面での反射光により不要な
干渉パターンが記録されてしまう。なお、図４における
θB はＰ偏光の反射率が０になるブルースター角であ
る。However, when light is directly incident on a hologram recording material F having a refractive index n 2 different from that of a medium having a refractive index n 1 such as air, Fresnel reflection on the surface of the recording material F causes Part of the incident lights A and B are reflected and do not contribute effectively to recording. FIG. 4 shows the refractive index n 1 =
Incident angle θ from 1.0 air to medium with refractive index n 2 = 1.5
2 is a graph showing energy reflectance R and energy transmittance T at the interface when light is incident at 1 , and a refractive index n
The same applies when light enters from the second medium to the medium having the refractive index n 1 . As is clear from this graph, when the lights A and B are S-polarized light, when entering and exiting the recording material F, the reflectance is higher than that of P-polarized light. Therefore, when the S-polarized light is used, the efficiency of recording is reduced at the time of hologram recording and duplication as shown in FIG. 3, and an unnecessary interference pattern is recorded due to the reflected light at the interface. Note that θ B in FIG. 4 is the Brewster angle at which the reflectance of P-polarized light becomes zero.
【０００４】しかしながら、これとは逆に、光Ａ、Ｂを
Ｐ偏光として記録材料Ｆに入射させると、２光束の干渉
成分が小さくなるため、干渉縞が低コントラストになっ
て良好なホログラムが得られない。On the contrary, when the lights A and B are made to enter the recording material F as P-polarized light, the interference component of the two light beams becomes small, so that the interference fringes have a low contrast and a good hologram is obtained. I can't.
【０００５】本発明はこのような状況に鑑みてなされた
ものであり、その目的は、ホログラム記録に低反射率の
Ｐ偏光を用い、記録材料内では干渉成分の大きいＳ偏光
になるようにして、高効率で記録できかつ不要な干渉パ
ターンを低減させるホログラム記録方法を提供すること
である。The present invention has been made in view of the above circumstances, and an object thereof is to use P-polarized light having a low reflectance for hologram recording and to make S-polarized light having a large interference component in a recording material. Another object of the present invention is to provide a hologram recording method capable of highly efficient recording and reducing unnecessary interference patterns.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成する本発
明のホログラム記録方法は、光学異方性を有する透明体
をホログラム記録材料の入射平面に密着あるいは屈折率
整合液を介して密着させることにより、記録材料入射平
面に対してほぼＰ偏光で入射した光がほぼＳ偏光でホロ
グラム記録材料に入るようにしたことを特徴とする方法
である。In the hologram recording method of the present invention to achieve the above object, a transparent body having optical anisotropy is brought into close contact with an incident plane of a hologram recording material or through a refractive index matching liquid. Thus, the light incident on the recording material incident plane with substantially P-polarized light enters the hologram recording material with substantially S-polarized light.
【０００７】この場合、ホログラム記録材料の片側に光
学異方性を有する透明体を密着させ、他方の側にホログ
ラム原版あるいは反射面を密着させてホログラム記録を
行うこともでき、また、ホログラム記録材料の両側に光
学異方性を有する透明体を密着させ、両側から光を入射
させてホログラム記録を行うこともできる。In this case, hologram recording can be performed by bringing a transparent material having optical anisotropy into close contact with one side of the hologram recording material and a hologram original plate or a reflecting surface in close contact with the other side of the hologram recording material. It is also possible to bring a transparent body having optical anisotropy into close contact with both sides of the above and to make light enter from both sides for hologram recording.
【０００８】また、光学異方性を有する透明体として
は、複屈折材料からなるもの、液晶からなるもの等を用
いることができる。As the transparent body having optical anisotropy, one made of a birefringent material, one made of a liquid crystal or the like can be used.
【０００９】[0009]
【作用】本発明においては、光学異方性を有する透明体
をホログラム記録材料の入射平面に密着あるいは屈折率
整合液を介して密着させることにより、記録材料入射平
面に対してほぼＰ偏光で入射した光がほぼＳ偏光でホロ
グラム記録材料に入るようにしたので、入射光として反
射率の低いＰ偏光を用い、ホログラム記録には干渉成分
の大きいＳ偏光に変換することができ、回折効率の高い
干渉縞を記録光の高い利用効率で記録することができ
る。また、透過光等が空気中に出る時の反射率も低くな
り、この反射光に伴う不要な干渉パターンも低く抑えら
れる。In the present invention, a transparent body having optical anisotropy is brought into close contact with the incident plane of the hologram recording material or through a refractive index matching liquid so that the incident plane is substantially P-polarized. Since the generated light is made to enter the hologram recording material with almost S-polarized light, P-polarized light having a low reflectance can be used as incident light, and can be converted into S-polarized light having a large interference component for hologram recording, resulting in high diffraction efficiency. Interference fringes can be recorded with high utilization efficiency of recording light. Further, the reflectance when the transmitted light or the like goes out into the air also becomes low, and an unnecessary interference pattern due to the reflected light can be suppressed low.
【００１０】[0010]
【実施例】以下、本発明のホログラム記録方法の実施例
について図面を参照にして説明する。本発明の基本原理
は、ホログラム記録材料の光入射側に入射光の偏光面を
ほぼ９０°回転させる光学異方素子を密着させ、入射光
として反射率の低いＰ偏光を用い、ホログラム記録材料
内ではその入射光を干渉成分の大きいＳ偏光に変換する
ことである。Embodiments of the hologram recording method of the present invention will be described below with reference to the drawings. The basic principle of the present invention is that an optical anisotropic element that rotates the polarization plane of incident light by about 90 ° is closely attached to the light incident side of the hologram recording material, and P-polarized light having a low reflectance is used as the incident light. Then, the incident light is converted into S-polarized light having a large interference component.
【００１１】図１（ａ）は、ホログラム記録材料Ｆにホ
ログラム原版又はミラーＭを密着し、原版又はミラーＭ
と反対側から記録材料Ｆに光束Ａを入射させ、その入射
光Ａと記録材料Ｆを透過し原版又はミラーＭで回折又は
反射された光束Ｃとを記録材料Ｆで干渉させてホログラ
ム複製又は記録する場合の断面図であり、本発明に基づ
いて、フォトポリマー等のホログラム記録材料Ｆの光Ａ
入射側に光学異方素子Ｗを密着あるいは屈折率整合液を
介して密着する。この光学異方素子Ｗは複屈折性の透明
板からなり、Ｓ偏光の屈折率が記録材料Ｆの屈折率にほ
ぼ等しく設定され、その光学軸Ｘは、同図（ｂ）の光入
射側から見た平面図に示すように、入射光線Ａを含む入
射面と４５°をなし、かつ、記録材料Ｆの入射平面に平
行な方向に向いている。そして、その厚さは、入射光Ａ
の屈折後の通過距離ｄ1 が、ｍ1を０又は正の整数、λ
をその波長、Δｎを常光屈折率と異常光屈折率の差とす
るとき、λ（２ｍ1 ＋１）／２Δｎで表されるような厚
さ分布を有している。In FIG. 1A, a hologram recording material F is closely attached to a hologram original plate or a mirror M, and the original plate or mirror M is attached.
A light beam A is incident on the recording material F from the opposite side, and the incident light A and the light beam C transmitted through the recording material F and diffracted or reflected by the original plate or the mirror M are interfered by the recording material F to perform hologram duplication or recording. FIG. 7 is a cross-sectional view of a case where the light A of the hologram recording material F such as a photopolymer is formed according to the present invention.
The optical anisotropic element W is brought into close contact with the incident side or through a refractive index matching liquid. This optical anisotropic element W is made of a birefringent transparent plate, and the refractive index of S-polarized light is set to be substantially equal to the refractive index of the recording material F, and its optical axis X is from the light incident side in FIG. As shown in the plan view as seen, it forms an angle of 45 ° with the plane of incidence containing the incident ray A and is oriented in a direction parallel to the plane of incidence of the recording material F. The thickness of the incident light A
Passing distance d 1 after refraction of the m 1 0 or a positive integer, lambda
Is the wavelength and Δn is the difference between the ordinary and extraordinary refractive indices, the thickness distribution is represented by λ (2m 1 +1) / 2Δn.
【００１２】このような厚みの条件を満たす光学異方素
子Ｗを入射光Ａの入射側に密着することにより、入射光
Ａとしてフレネル反射損失の小さいＰ偏光を用いても、
記録材料Ｆ内では干渉成分の大きいＳ偏光に変換され、
回折効率の高い干渉縞が記録光の高い利用効率で記録で
きる。Even if P-polarized light having a small Fresnel reflection loss is used as the incident light A by closely contacting the optical anisotropic element W satisfying such a thickness condition with the incident side of the incident light A,
In the recording material F, it is converted into S-polarized light with a large interference component,
Interference fringes with high diffraction efficiency can be recorded with high utilization efficiency of recording light.
【００１３】さらに、回折光又は反射光Ｃも空気中に出
る際、光学異方素子ＷでＳ偏光からＰ偏光に変換される
ので、出射時の反射率も低くなり、この反射光に伴う不
要な干渉パターンも低く抑えられる。特に、記録材料Ｆ
から光学異方素子Ｗを通って出射する距離をｄ2 とする
と、ｄ1 （２ｍ2 ＋１）＝ｄ2 （２ｍ1 ＋１）が近似的
に成り立つように光学異方素子Ｗの厚み分布を持たせる
と、より効率的に不要干渉パターンを抑えることができ
る（ｍ2 は０又は正の整数）。Further, when the diffracted light or the reflected light C is also emitted into the air, the optical anisotropic element W converts the S-polarized light into the P-polarized light, so that the reflectance at the time of emission becomes low, which is unnecessary with the reflected light. The interference pattern is also kept low. Especially, the recording material F
If the distance of light emitted from the optical anisotropic element W through the optical anisotropic element W is d 2 , the thickness distribution of the optical anisotropic element W is set so that d 1 (2m 2 +1) = d 2 (2m 1 +1) approximately holds. By doing so, the unnecessary interference pattern can be suppressed more efficiently (m 2 is 0 or a positive integer).
【００１４】次に、図２は、ホログラム記録材料Ｆの両
側から２つの光束Ａ、Ｂを入射させて、２光束の干渉に
よりホログラム記録する場合の断面図であり、この場合
は、ホログラム記録材料Ｆの両側に同様な光学異方素子
Ｗ1 、Ｗ2 を密着あるいは屈折率整合液を介して密着す
る。この場合の光学異方素子Ｗ1 、Ｗ2 の厚さも、入射
光Ａ、Ｂの屈折後の通過距離ｄ11、ｄ21が、それぞれλ
（２ｍ11＋１）／２Δｎ、λ（２ｍ21＋１）／２Δｎで
表されるような厚さ分布を有している。また、記録材料
Ｆ通過後の出射時の反射率を低くするためには、光Ａ、
Ｂの記録材料Ｆ通過後に光学異方素子Ｗ2 、Ｗ1 を通過
する距離をｄ22、ｄ12とすると、それぞれｄ11（２ｍ12
＋１）＝ｄ12（２ｍ11＋１）、ｄ21（２ｍ22＋１）＝ｄ
22（２ｍ21＋１）が近似的に成り立つように光学異方素
Ｗ1 、Ｗ2 の厚み分布を持たせることが望ましい
（ｍ11、ｍ12、ｍ21、ｍ22は０又は正の整数）。Next, FIG. 2 is a cross-sectional view of a case where two light beams A and B are made incident from both sides of the hologram recording material F and hologram recording is performed by interference of the two light beams. In this case, the hologram recording material is used. Similar optical anisotropic elements W 1 and W 2 are closely adhered to both sides of F or through a refractive index matching liquid. In this case, the thicknesses of the optical anisotropic elements W 1 and W 2 are such that the passing distances d 11 and d 21 of the incident lights A and B after refraction are λ, respectively.
The thickness distribution is represented by (2m 11 +1) / 2Δn and λ (2m 21 +1) / 2Δn. In order to reduce the reflectance at the time of emission after passing through the recording material F, the light A,
Assuming that distances passing through the optical anisotropic elements W 2 and W 1 after passing the recording material F of B are d 22 and d 12 , respectively, d 11 (2 m 12
+1) = d 12 (2m 11 +1), d 21 (2m 22 +1) = d
It is desirable to have the thickness distribution of the optical anisotropic elements W 1 and W 2 so that 22 (2m 21 +1) approximately holds (m 11 , m 12 , m 21 and m 22 are 0 or a positive integer). .
【００１５】ところで、上記において、例えばｍ1 は自
由度を持つ整数であることから、異なるの記録光の波長
をλ1 、λ2 、λ3 …とすると、λ1 （２ｍ11＋１）＝
λ2（２ｍ12＋１）＝λ3 （２ｍ13＋１）…が近似的に
成り立つような厚み分布を持つ光学異方素子Ｗを用いる
ことにより、多色ホログラムの記録においても、同様に
記録光の高効率化や不要な回折パターンの低減が図れ
る。By the way, in the above, for example, m 1 is an integer having a degree of freedom. Therefore, if the wavelengths of different recording lights are λ 1 , λ 2 , λ 3, ... λ 1 (2m 11 +1) =
By using the optical anisotropic element W having a thickness distribution such that λ 2 (2m 12 +1) = λ 3 (2m 13 +1) ... Approximately holds, even when recording a multicolor hologram, the recording light It is possible to improve efficiency and reduce unnecessary diffraction patterns.
【００１６】ところで、図２の場合は２光束を反対側か
ら記録材料Ｆに入射する場合であったが、同じ側から異
なる角度で入射する場合にも同様にして回折効率の高い
干渉縞を記録光の高い利用効率で記録でき、反射光に伴
う不要な干渉パターンも低く抑えることができる。ま
た、光学異方素子Ｗ、Ｗ1 、Ｗ2 として、複屈折材料以
外にもＴＮ液晶等の液晶を用いることができる。By the way, in the case of FIG. 2, the two light beams are incident on the recording material F from the opposite side, but also when they are incident from the same side at different angles, interference fringes having high diffraction efficiency are similarly recorded. Recording can be performed with high light utilization efficiency, and unnecessary interference patterns due to reflected light can be suppressed to a low level. In addition to the birefringent material, liquid crystal such as TN liquid crystal can be used as the optical anisotropic elements W, W 1 and W 2 .
【００１７】なお、以上において、２つの光束Ａ、Ｂは
同一入射面において入射するものとしたが、異なってい
ても、近似的に同じと見なせる範囲で同様に適用でき
る。また、入射光Ａ、Ｂ、Ｃが平行光でなくとも、光学
異方素子の厚さ、光学軸に分布を持たせることにより対
応可能であるし、近似的に透過光をＳ偏光又はＰ偏光に
変換できればその効果は達成できるので、必ずしも平行
光の場合に限定されるものではない。In the above description, the two light beams A and B are assumed to be incident on the same incident surface, but even if they are different, they can be similarly applied within a range that can be regarded as approximately the same. Further, even if the incident lights A, B, and C are not parallel lights, it is possible to deal with them by giving a distribution to the thickness and the optical axis of the optical anisotropic element, and the transmitted light is approximately S-polarized or P-polarized. Since the effect can be achieved if it can be converted to, it is not necessarily limited to the case of parallel light.
【００１８】以上、本発明のホログラム記録方法を実施
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。The hologram recording method of the present invention has been described above based on the embodiments, but the present invention is not limited to these embodiments, and various modifications can be made.
【００１９】[0019]
【発明の効果】以上の説明から明らかなように、本発明
のホログラム記録方法によると、光学異方性を有する透
明体をホログラム記録材料の入射平面に密着あるいは屈
折率整合液を介して密着させることにより、記録材料入
射平面に対してほぼＰ偏光で入射した光がほぼＳ偏光で
ホログラム記録材料に入るようにしたので、入射光とし
て反射率の低いＰ偏光を用い、ホログラム記録には干渉
成分の大きいＳ偏光に変換することができ、回折効率の
高い干渉縞を記録光の高い利用効率で記録することがで
きる。また、透過光等が空気中に出る時の反射率も低く
なり、この反射光に伴う不要な干渉パターンも低く抑え
られる。As is apparent from the above description, according to the hologram recording method of the present invention, the transparent body having optical anisotropy is brought into close contact with the incident plane of the hologram recording material or through the index matching liquid. As a result, since the light incident on the recording material incident plane with substantially P-polarized light enters the hologram recording material with substantially S-polarized light, P-polarized light having a low reflectance is used as incident light and an interference component is used for hologram recording. Can be converted into S-polarized light having a high diffraction efficiency, and interference fringes with high diffraction efficiency can be recorded with high utilization efficiency of recording light. Further, the reflectance when the transmitted light or the like goes out into the air also becomes low, and an unnecessary interference pattern due to the reflected light can be suppressed low.
【図１】本発明のホログラム記録方法を実施するための
１実施例の配置を示す断面図と平面図である。FIG. 1 is a sectional view and a plan view showing the arrangement of an embodiment for carrying out a hologram recording method of the present invention.
【図２】他の実施例の配置を示す断面図である。FIG. 2 is a sectional view showing an arrangement of another embodiment.
【図３】従来のホログラム記録、複製を行う場合の配置
を示す断面図である。FIG. 3 is a cross-sectional view showing an arrangement when performing conventional hologram recording and duplication.
【図４】屈折率が異なる界面での反射率と透過率を示す
図である。FIG. 4 is a diagram showing reflectance and transmittance at an interface having different refractive indexes.
Ｆ…ホログラム記録材料 Ｍ…ホログラム原版又はミラー Ａ、Ｂ…入射光 Ｃ…回折光又は反射光 Ｗ、Ｗ1 、Ｗ2 …光学異方素子F ... hologram recording material M ... hologram master or mirror A, B ... incident light C ... diffracted light or reflected light W, W 1, W 2 ... optical anisotropic element
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G03H 1/04 ─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) G03H 1/04
Claims (5)
記録材料の入射平面に密着あるいは屈折率整合液を介し
て密着させることにより、記録材料入射平面に対してほ
ぼＰ偏光で入射した光がほぼＳ偏光でホログラム記録材
料に入るようにしたことを特徴とするホログラム記録方
法。1. A transparent material having optical anisotropy is brought into close contact with the incident plane of the hologram recording material or through a refractive index matching liquid so that light incident on the incident plane of the recording material as P-polarized light is A hologram recording method, characterized in that the hologram recording material is made to enter substantially a S-polarized light.
を有する透明体を密着させ、他方の側にホログラム原版
あるいは反射面を密着させてホログラム記録を行うこと
を特徴とする請求項１記載のホログラム記録方法。2. The hologram recording is performed by bringing a transparent body having optical anisotropy into close contact with one side of the hologram recording material and a hologram original plate or a reflecting surface in close contact with the other side of the hologram recording material. Hologram recording method.
を有する透明体を密着させ、両側から光を入射させてホ
ログラム記録を行うことを特徴とする請求項１記載のホ
ログラム記録方法。3. The hologram recording method according to claim 1, wherein a transparent body having optical anisotropy is brought into close contact with both sides of the hologram recording material, and light is incident from both sides to perform hologram recording.
材料からなることを特徴とする請求項１から３の何れか
１項記載のホログラム記録方法。4. The hologram recording method according to claim 1, wherein the transparent body having optical anisotropy is made of a birefringent material.
らなることを特徴とする請求項１から３の何れか１項記
載のホログラム記録方法。5. The hologram recording method according to claim 1, wherein the transparent body having optical anisotropy is made of liquid crystal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00260094A JP3431253B2 (en) | 1994-01-14 | 1994-01-14 | Hologram recording method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00260094A JP3431253B2 (en) | 1994-01-14 | 1994-01-14 | Hologram recording method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07210067A JPH07210067A (en) | 1995-08-11 |
| JP3431253B2 true JP3431253B2 (en) | 2003-07-28 |
Family
ID=11533888
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00260094A Expired - Fee Related JP3431253B2 (en) | 1994-01-14 | 1994-01-14 | Hologram recording method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3431253B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001272906A (en) * | 2000-01-21 | 2001-10-05 | Dainippon Printing Co Ltd | Hologram original plate and method for making the same |
| JP4199099B2 (en) * | 2003-12-09 | 2008-12-17 | パイオニア株式会社 | Hologram recording medium and recording / reproducing system |
| JP5360392B2 (en) * | 2009-05-26 | 2013-12-04 | 大日本印刷株式会社 | Hologram replication method and hologram replicated thereby |
-
1994
- 1994-01-14 JP JP00260094A patent/JP3431253B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07210067A (en) | 1995-08-11 |
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