【発明の詳細な説明】〔産業上の利用分野］本発明は光学的に情報の追加記録及び再生が可能であり
、さらに記録情報の破壊が可能な光カード、及びその記
録情報破壊方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical card on which additional information can be optically recorded and reproduced, and furthermore, recorded information can be destroyed, and a method for destroying the recorded information.
従来、カード形状の情報記録媒体としては磁気カードが
広く用いられてきたが、大容量化と信輔性向上の要求が
高まるにつれてＩＣカードや光カ−ドが提案されるに至
っている。中でも情報の追加記録が可能な追記型光カー
ドは安価、大容量で磁気や静電気の影響を受けず、情報
の誤消去・改ざんの腹のない携帯型媒体であり、利用範
囲が広く有望視されている。Conventionally, magnetic cards have been widely used as card-shaped information recording media, but as demands for larger capacity and improved reliability have increased, IC cards and optical cards have been proposed. Among these, write-once optical cards that can record additional information are inexpensive, have a large capacity, are unaffected by magnetism or static electricity, and are portable media that do not allow information to be accidentally erased or tampered with, and are seen as promising for a wide range of uses. ing.
かかる追記型光カードに対する光学的情報記録方式とし
ては、カード内に埋設した光記録層の一部に種数μｍに
絞ったレーザビームを照射して孔部を形成する、所謂孔
あけ方式が広く採用されている。この方式の記録材料と
してはＴｅ系化合物やシアニン系色素などが知られてお
り、記録材料を永久変形させる温度で加熱しない限り記
録が消滅することがないことが記録情報の保存上の利点
となっている。As an optical information recording method for such a write-once optical card, a so-called perforation method is widely used, in which a hole is formed by irradiating a part of the optical recording layer embedded in the card with a laser beam focused to a genus number of μm. It has been adopted. Te-based compounds and cyanine-based dyes are known as recording materials for this method, and the advantage in preserving recorded information is that the recording will not disappear unless heated to a temperature that permanently deforms the recording material. ing.
しかしながら、上述した孔あけ方式の記録材料の利点も
時には欠点となることがあり得る。すなわち、上述した
孔あけ方式の追記型光カードの寿命は通常の使用状態で
は１０年以上とされているが、決して永久的なものでは
ないので、長期に亘る記録情報の保存を要する場合には
安全のため数年毎に更新する必要があるとされている。However, the advantages of the above-mentioned perforated recording materials can sometimes also be disadvantages. In other words, the lifespan of the write-once optical card using the punching method described above is said to be over 10 years under normal usage conditions, but it is by no means permanent, so if you need to preserve recorded information for a long time, For safety reasons, it is said that it must be updated every few years.
この更新とは、旧い光カードの記録情報を新しい光カー
ドに書き写して旧い光カードを廃棄することを意味する
。ところが、光カードの用途として医療カードや預金通
帳カードなど個人の秘密情報を記録する用途が考えられ
、この樟なカードを情報再生可能な状態で廃棄すること
は危険である。簡便な方法として、光カードを三片に切
断したり、光記録部に穿孔したりすれば、光カードの記
録再生装置では情報の再生は不可能になるのであろう。This update means copying the recorded information on the old optical card to a new optical card and discarding the old optical card. However, optical cards can be used to record personal confidential information, such as medical cards and bankbook cards, and it is dangerous to dispose of these cards in a state where the information can be reproduced. As a simple method, if the optical card is cut into three pieces or the optical recording section is perforated, the information will not be able to be reproduced by the optical card recording/reproducing device.
しかしそれでもなお、例えば記録痕の顕微鏡観察等の手
段により、多大な労力と困難を伴うとはいえ、配録情報
を読み出すことは全く不可能とは言えない、従って、こ
の様な危険を避けるには不要になった光カードを即時に
焼却するなどの非実用的な方法しかなかった。However, it is still not impossible to read out the recording information by means such as microscopic observation of recording marks, although it requires a great deal of effort and difficulty. The only option available was impractical methods such as immediately incinerating optical cards that were no longer needed.
本発明は上述した問題点に鑑みてなされたものであって
、通常の使用状態では十分な信転性があってしかもその
記録情報を簡便な方法で破壊することが可能な追記型の
光カード、及びその記録情報を簡便に破壊する方法を提
供しようとするものである。The present invention has been made in view of the above-mentioned problems, and is a write-once optical card that has sufficient reliability under normal usage conditions and that allows the recorded information to be destroyed in a simple manner. , and a method for easily destroying its recorded information.
〔課題を解決する手段］本発明の第１は、記録再生光の波長λ、と異なる波長λ
□の光の照射により褪色することのできる光記録層と、
少なくとも光記録部の全体を覆う樺にカード表面に剥離
可能に設けられた、波長λ、を透過し波長λ２を透過し
ないカバーフィルム層とを有することを特徴とする光カ
ードである。[Means for Solving the Problems] The first aspect of the present invention is to use a wavelength λ different from the wavelength λ of the recording/reproducing light.
an optical recording layer that can be discolored by irradiation with light;
This optical card is characterized in that it has a cover film layer that is removably provided on the surface of the card and that transmits wavelength λ and does not transmit wavelength λ2, which covers at least the entire optical recording section.
本発明の第２は、記録再生光の波長λ１が７００〜９０
０ｎｍの近赤外域、光記録層を褪色する光の波長λ２が
２００〜４００ｎｍの紫外域であることを特徴とする、
本発明の第１に記載の光カードである。The second aspect of the present invention is that the wavelength λ1 of the recording/reproducing light is 700-900.
It is characterized in that the wavelength λ2 of the light that fades the optical recording layer is in the near-infrared region of 0 nm and in the ultraviolet region of 200 to 400 nm.
This is an optical card according to the first aspect of the present invention.
本発明の第３は、本発明の第１に記載の光カードにつき
、表面に剥離可能に設けられたカバーフィルム層を剥離
除去したのち、該光カードの少なくとも光記録部全体に
波長λ２の光を照射することにより光記録層を褪色させ
ることを特徴とする、光カードの記録情報破壊方法であ
る。A third aspect of the present invention is that, in the optical card according to the first aspect of the present invention, after the cover film layer removably provided on the surface is peeled off, at least the entire optical recording portion of the optical card is illuminated with a wavelength λ2. This is a method for destroying recorded information on an optical card, which is characterized by discoloring the optical recording layer by irradiating it with
本発明の第４は、本発明の第２に記載の光カードにつき
、光記録層の褪色のために用いる光の波長λ２が２００
〜４００ｎｍの紫外域であることを特徴とする、本発明
の第３に記載の光カードの記録情報破壊方法である。A fourth aspect of the present invention is the optical card according to the second aspect of the present invention, in which the wavelength λ2 of the light used for fading the optical recording layer is 200 nm.
The method for destroying information recorded on an optical card according to the third aspect of the present invention is characterized in that the wavelength is in the ultraviolet region of ~400 nm.
以下、図面を参照しつつ本発明の詳細な説明する。第１
図は本発明の光カードの基本構成を示す断面図、第２図
は本発明の光カードの記録情報破壊方法の一実施例を示
す説明図である。Hereinafter, the present invention will be described in detail with reference to the drawings. 1st
FIG. 2 is a sectional view showing the basic structure of the optical card of the present invention, and FIG. 2 is an explanatory diagram showing an embodiment of the method of destroying information recorded on the optical card of the present invention.
本発明の光カードの基本構成は第１図に示す通りであり
、カバーフィルム層１、透明基板２、光記録層３、接着
剤層４及び裏打基板５をこの順に積層して構成される。The basic structure of the optical card of the present invention is as shown in FIG. 1, and is constructed by laminating a cover film layer 1, a transparent substrate 2, an optical recording layer 3, an adhesive layer 4, and a backing substrate 5 in this order.
透明基板２の光記録部７には通常、記録再往時のトラッ
キングを可能とするための案内溝６が設けられるが、ト
ラッキング方式としては光記録層３内に反射率の異なる
トラフキングガイド部を設ける濃淡方式など案内溝６に
よらない方式も提案されている。本発明は案内溝６を用
いる方式に限定されるものではない。The optical recording section 7 of the transparent substrate 2 is usually provided with a guide groove 6 to enable tracking during re-recording, but the tracking method uses tracking guide sections with different reflectances in the optical recording layer 3. A method that does not rely on the guide groove 6, such as a light and shade method provided, has also been proposed. The present invention is not limited to the method using the guide groove 6.
透明基板２の材質は通常アクリル系樹脂、エポキシ系樹
脂、ポリカーボネート樹脂、ポリエステル系樹脂、ポリ
塩化ビニル樹脂、ポリオレフィン系樹脂等、透明性や光
学的等方性、均質性に優れた材質が用いられている。本
発明の光カードにおいては特に、記録再生光の波長λ、
及び光記録層３の褪色に用いる光の波長λ２の双方に対
して透明であることが必要である。カバーフィルム層１
の材質は透明基板２と同一でも異なっていても良いが、
これに対しては上記波長λ１に対しては透明性が、上記
波長λ、に対しては 遮蔽性が要求される。透明基板２
と同一の材質でも、これに上記波長λ、を吸収せず上記
波長λ２を吸収する物質を添加することにより、カバー
フィルムＮ１用材として使用することも可能である。カ
バーフィルム層１の厚さは５０μｍ乃至２００μｍ程度
が好適であり、これを透明基板２上に剥離可能に積層す
る方法としては、比較的接着力の弱い粘着性接着剤を用
いる方法や、低めの温度で熱圧着する方法などを適用す
ることができる。The material of the transparent substrate 2 is usually a material with excellent transparency, optical isotropy, and homogeneity, such as acrylic resin, epoxy resin, polycarbonate resin, polyester resin, polyvinyl chloride resin, or polyolefin resin. ing. In particular, in the optical card of the present invention, the wavelength λ of the recording/reproducing light,
It needs to be transparent to both the wavelength λ2 of the light used for fading the optical recording layer 3. Cover film layer 1
The material of the transparent substrate 2 may be the same or different, but
For this purpose, transparency is required for the wavelength λ1, and shielding property is required for the wavelength λ. Transparent substrate 2
It is also possible to use the same material as the material for the cover film N1 by adding a substance that does not absorb the wavelength λ but absorbs the wavelength λ2. The thickness of the cover film layer 1 is preferably about 50 μm to 200 μm, and methods for releasably laminating it on the transparent substrate 2 include a method using a tacky adhesive with relatively weak adhesive strength, or a method using a relatively low adhesive adhesive. A method such as thermocompression bonding at high temperature can be applied.
光記録層３としては、シアニン系、フタロシアニン系、
インドアニリン系、スクワリリウム系、等の有機色素を
含む組成物を適用するのが好適である。記録再生光の光
源としては、小型・軽量で安定的に高出力が得られる半
導体レーザ（波長λ＝８３０ ｎｍなど）が最も好適で
あるので、前記有機色素としては７００〜９００ ｎｍ
の近赤外域に最大吸収波長λ１．．を有するものが選ば
れ、特にシアニン系色素には上記半導体レーザの波長に
対し高い記録感度を有するものが多種知られている（例
えば特開昭５９−２４６９２号、特開昭５９−８５７９
１号などを参照）。またこれらの有機色素には紫外線照
射により褪色性のものも多種知られている。これらはそ
のまま本発明の光カードの光記録層３として使用できる
場合もあろうが、一般には褪色速度や飽和褪色度などが
不十分であるので、この様な場合には紫外線増感剤を添
加するのが良い。この紫外線増悪剤としては、例えばア
ゾ化合物、ジアゾ化合物、アントラキノン類、ベンゾイ
ン類等の物質が適用可能であり、その添加量は前記有機
色素に対し０．５％乃至５％程度が適当である。As the optical recording layer 3, cyanine-based, phthalocyanine-based,
It is preferable to apply a composition containing an organic dye such as indoaniline type or squarylium type. As a light source for recording and reproducing light, a semiconductor laser (wavelength λ = 830 nm, etc.) is most suitable because it is small and lightweight and can stably provide high output.
The maximum absorption wavelength is λ1 in the near-infrared region. ．． In particular, many cyanine-based dyes are known that have high recording sensitivity to the wavelength of the semiconductor laser (for example, Japanese Patent Laid-Open No. 59-24692, Japanese Patent Laid-Open No. 59-8579).
(See issue 1, etc.). Furthermore, many types of these organic dyes are known to be fading when exposed to ultraviolet irradiation. These may be able to be used as they are as the optical recording layer 3 of the optical card of the present invention, but generally the fading speed and saturation degree of fading are insufficient, so in such cases, an ultraviolet sensitizer may be added. It's good to do that. As the ultraviolet aggravating agent, substances such as azo compounds, diazo compounds, anthraquinones, and benzoins can be used, and the appropriate amount of addition thereof is about 0.5% to 5% based on the organic dye.
光記録層３にはこの他バインダー樹脂や各種安定剤等が
含有されていても良い。成膜方法としては真空蒸着法、
スパッタリング法等の真空プロセスや、スピンコード法
、ロールコート法等の湿式プロセス等が適用でき、その
膜厚は通常３００人乃至２０００人の範囲が適当である
。The optical recording layer 3 may also contain a binder resin, various stabilizers, and the like. The film forming method is vacuum evaporation method,
A vacuum process such as a sputtering method, a wet process such as a spin code method or a roll coating method, etc. can be applied, and the appropriate film thickness is usually in the range of 300 to 2,000 layers.
必要な場合には、下引層、光反射層、光吸収層、増感層
等を光記録層３に積層して設けても良い。If necessary, a subbing layer, a light reflecting layer, a light absorbing layer, a sensitizing layer, etc. may be laminated on the optical recording layer 3.
接着剤層４及び裏打基板５は、少なくともその一方が光
記録層３を褪色する波長λ２を遮蔽することが必要であ
るが、その他はカードの体裁上必要な物理的・化学的特
性を満足するものであれば、その材質は特に限定されな
い。It is necessary for at least one of the adhesive layer 4 and the backing substrate 5 to block the wavelength λ2 that discolors the optical recording layer 3, but the other components satisfy the physical and chemical properties necessary for the appearance of the card. The material is not particularly limited.
以上説明した構成の光カードの記録情報を破壊するには
以下に述べる操作を行えば良い。まず光カードの表面に
設けられたカバーフィルム層１を剥離除去する（第２図
ａ）ｍ次に該光カードの少なくとも光記録部７全体に、
光記録層３を褪色する波長λ２の光の光源８、例えば高
圧水銀灯、を用いて前記波長λ２の光、例えば波長３６
５ ｎｍの紫外光、を照射して、光記録層３を褪色させ
る（第２図ｂ）。褪色した光記録層３１は、光反射能、
光吸収能とも失っているので、光カードの記録再生装置
では勿論、顕微鏡観察等の手段を用いても、もはや記録
層３に形成されていた記録痕を識別することができず、
記録情報の読み出しは不可能である。To destroy the recorded information on the optical card configured as described above, the following operations may be performed. First, the cover film layer 1 provided on the surface of the optical card is peeled off (FIG. 2a).Next, at least the entire optical recording section 7 of the optical card is coated with
Using a light source 8 of light having a wavelength λ2, such as a high-pressure mercury lamp, which discolors the optical recording layer 3, the light having the wavelength λ2, for example, a wavelength 36 is used.
The optical recording layer 3 is faded by irradiation with 5 nm ultraviolet light (FIG. 2b). The faded optical recording layer 31 has light reflecting ability,
Since it has lost its light absorption ability, it is no longer possible to identify the recording marks that had been formed on the recording layer 3, not only with an optical card recording/reproducing device, but also with means such as microscopic observation.
It is impossible to read the recorded information.
〈作用〉本発明の光カードは、カバーフィルム層１、透明基板２
とも記録再生光の波長λ１をよく透過するので、情報の
記録再生に支障をきたすことがなく、カバーフィルム層
１が光記録層３を褪色する光の波長λ２を遮蔽するので
、通常の使用環境において自然光中の前記波長λ２の光
によって光記録層３が褪色、劣化することがないので、
信頼性が高い。一方、カバーフィルム層１を剥離除去し
たのち前記波長λ２の光を照射するという簡便な方法に
より、光記録層３を褪色させ記録情報の読み出しを不可
能にすることができるので、光カードの更新後不要にな
った旧い光カードの廃棄により個人の秘密情報が他人に
読み出されなどの戊がなく、安全性が高い、特に、記録
再生光の波長λとして７００〜９００ｎｍの近赤外域、
光記録層３を褪色する光の波長λ２として２００〜４０
０ｎｍの紫外域を選ぶことにより、使用可能な光記録材
料が広く選択できるほか、記録再生光の光源として半導
体レーザ、光記録層３を褪色する波長λ２の光の光源と
して高圧水銀灯など、比較的簡便な装置を用いることが
でき、最も好適である。<Function> The optical card of the present invention includes a cover film layer 1, a transparent substrate 2
Since the wavelength λ1 of the recording and reproducing light is transmitted well in both cases, there is no problem in recording and reproducing information, and the cover film layer 1 blocks the wavelength λ2 of the light that discolors the optical recording layer 3, so it can be used under normal usage environment. Since the optical recording layer 3 is not discolored or deteriorated by the light of the wavelength λ2 in natural light,
Highly reliable. On the other hand, by peeling off the cover film layer 1 and then irradiating it with light of the wavelength λ2, it is possible to discolor the optical recording layer 3 and make it impossible to read the recorded information, so that the optical card can be updated. There is no risk of personal confidential information being read out by others when old optical cards are disposed of when they are no longer needed, and are highly secure.In particular, near-infrared light with a wavelength λ of 700 to 900 nm for recording and reproducing light,
The wavelength λ2 of the light that discolors the optical recording layer 3 is 200 to 40.
By choosing the ultraviolet region of 0 nm, it is possible to choose from a wide range of usable optical recording materials, and it is also possible to use a comparatively more flexible material, such as a semiconductor laser as a light source for recording and reproducing light, and a high-pressure mercury lamp as a light source for light with a wavelength λ2 that discolors the optical recording layer 3. It is most suitable because a simple device can be used.
〈実施例〉所定の案内溝が形成された厚さ３００μｍのメタクリル
樹脂製透明基板の光記録部に、１．１“３．３．３゛
３−へキサメチル−４，５−４“ ５′−ジベンゾ
−２，２−インドトリカルポシアニンヨーダイド及び２
．２−ジメトキシ−２−フェニルアセトフェノンをそれ
ぞれ１．５重量％及び０．０３重量％含有するシクロヘ
キサノン溶液をスピナー塗布して膜厚約７５ＯＡの光記
録層を形成し、ポリエステル系接着剤を介して裏打基板
と貼合わせ、さらに表面にカルボキシメチルセルロース
系粘着剤を介して厚さ１００μｍの紫外線吸収剤添加変
性アクリルフィルムを積層してカバーフィルム層とし、
カード形状に打抜いて光カードを得た。この光カードに
対し波長８３０ｎｍ、スポット径４μｍの半導体レーザ
光にて記録を行ったところ、レーザパワー４ｍＷにてＣ
Ｎ比４７ ｄ、 Ｂの再生信号が得られた。記録後の光
カードの光記録部を顕微鏡観察したところ、記録信号に
対応した記録痕が容易に確認できた。またこの光カード
をウェザ−メータにより晴天屋外２週間相当の紫外線曝
露試験を行ったところ、光記録層の反射率の低下は５％
以内であった。<Example> An optical recording section of a transparent substrate made of methacrylic resin with a thickness of 300 μm on which a predetermined guide groove was formed was coated with 1.1"3.3.3".
3-hexamethyl-4,5-4"5'-dibenzo-2,2-indotricarpocyanine iodide and 2
．． A cyclohexanone solution containing 1.5% by weight and 0.03% by weight of 2-dimethoxy-2-phenylacetophenone, respectively, was applied using a spinner to form an optical recording layer with a thickness of about 75 OA, and the layer was backed with a polyester adhesive. It is laminated with a substrate, and a 100 μm thick modified acrylic film added with an ultraviolet absorber is laminated on the surface via a carboxymethyl cellulose adhesive to form a cover film layer.
An optical card was obtained by punching it into a card shape. Recording was performed on this optical card using a semiconductor laser beam with a wavelength of 830 nm and a spot diameter of 4 μm.
A reproduced signal with an N ratio of 47 d.B was obtained. When the optical recording section of the optical card was observed under a microscope after recording, recording marks corresponding to the recorded signals were easily confirmed. In addition, when this optical card was subjected to a UV exposure test equivalent to two weeks outdoors in sunny weather using a weather meter, the reflectance of the optical recording layer decreased by 5%.
It was within
次に、この光カードの表面のカバーフィルム層を剥離除
去したのち、高圧水銀灯にて２００ｍＪ／ ｃ ｍ ’
の紫外線照射を行ったところ、光記録層の反射能は消失
し、光カード記録再生装置ではトラッキング不能であり
、顕微鏡観察によっても記録痕を認めることができなか
った。Next, after peeling and removing the cover film layer on the surface of this optical card, it was heated at 200 mJ/cm' with a high-pressure mercury lamp.
When irradiated with ultraviolet rays, the reflective ability of the optical recording layer disappeared, making it impossible to track with an optical card recording/reproducing device, and no recording traces could be observed by microscopic observation.
〈効果〉以上詳細に説明した様に、本発明の光カードは情報の記
録・再生に何等の支障もなく、通常の使用状態における
信転性にも優れ、しかも本発明の光カードの記録情報破
壊方法を通用することによって簡便にその記録情報を破
壊し安心して廃棄することができるという優れた利点を
有する。<Effects> As explained in detail above, the optical card of the present invention has no trouble in recording and reproducing information, has excellent reliability under normal use conditions, and moreover, the optical card of the present invention has excellent reliability in recording and reproducing information. It has the excellent advantage that by using a common destruction method, the recorded information can be easily destroyed and disposed of with peace of mind.
第１図は本発明の光カードの基本構成を示す断面図、第
２図ａ −ｂは本発明の光カードの記録情報破壊方法の
一実施例を示す説明図である。１−−−−一・−カバーフィルム層２−−−−一−−−−透明基板３−−−−−−一光記録層３１ ・−褪色した光記録層４−ｍ−接着剤層５ −−−−一 裏打基板６−−−−一 案内溝光記録部光記録層を褪色させる光の光源FIG. 1 is a sectional view showing the basic structure of the optical card of the present invention, and FIGS. 2a-2b are explanatory diagrams showing an embodiment of the method of destroying information recorded on the optical card of the present invention. 1----1.-Cover film layer 2-----1--Transparent substrate 3--1 optical recording layer 31 ・-Faded optical recording layer 4-m-Adhesive layer 5 -----1 Backing substrate 6----1 Guide groove optical recording section Light source of light that discolors the optical recording layer
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2152966AJPH0444898A (en) | 1990-06-12 | 1990-06-12 | Optical card and its recorded information destruction |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2152966AJPH0444898A (en) | 1990-06-12 | 1990-06-12 | Optical card and its recorded information destruction |
| Publication Number | Publication Date |
|---|---|
| JPH0444898Atrue JPH0444898A (en) | 1992-02-14 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2152966APendingJPH0444898A (en) | 1990-06-12 | 1990-06-12 | Optical card and its recorded information destruction |
| Country | Link |
|---|---|
| JP (1) | JPH0444898A (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0968984A1 (en)* | 1998-06-29 | 2000-01-05 | SM Schweizerische Munitionsunternehmung AG | Pyrotechnic layer for the targeted destruction of machine readable data on information carriers |
| US8570840B2 (en) | 2009-09-01 | 2013-10-29 | Seiko Epson Corporation | Timepiece with internal antenna |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0968984A1 (en)* | 1998-06-29 | 2000-01-05 | SM Schweizerische Munitionsunternehmung AG | Pyrotechnic layer for the targeted destruction of machine readable data on information carriers |
| US8570840B2 (en) | 2009-09-01 | 2013-10-29 | Seiko Epson Corporation | Timepiece with internal antenna |
| US8755253B2 (en) | 2009-09-01 | 2014-06-17 | Seiko Epson Corporation | Timepiece with internal antenna |
| Publication | Publication Date | Title |
|---|---|---|
| DE69734020T2 (en) | OTPIC MEDIUM WITH COPIER PROTECTION AND METHOD | |
| US6747930B1 (en) | Data protection on an optical disk | |
| JP5622710B2 (en) | Holographic data recording medium | |
| JPS63276721A (en) | Optical recording member and method for manufacturing the same, and method for manufacturing optical recording card | |
| JP3026358B2 (en) | Optical recording medium | |
| US20060204894A1 (en) | Optical recording medium and displaying method on surface of the medium | |
| JP2004506945A (en) | Holographic data recording medium | |
| US20040053140A1 (en) | Use of a packaging strip as a holographic data carrier | |
| JPH01503814A (en) | optical data storage | |
| JPH0444898A (en) | Optical card and its recorded information destruction | |
| US5292616A (en) | Optical card of closed type | |
| US4916300A (en) | Optically readable/writable card | |
| US5175720A (en) | Interactive optical disk | |
| EP0395053B1 (en) | Optical information recording medium | |
| JPH05318975A (en) | Information recording carrier and data hiding method for information recording medium | |
| US20040240369A1 (en) | Holographic data storage medium | |
| JPH07244869A (en) | Organic optical recording medium and its re-recording prevention method | |
| JPS63197040A (en) | optical card | |
| JP3314274B2 (en) | Magneto-optical recording medium | |
| AU5669490A (en) | Interactive optical disk, method of fabrication and apparatus for recording thereon | |
| JPH106044A (en) | How to prevent tampering with laser marking | |
| JPH02132655A (en) | optical card | |
| JP2938906B2 (en) | Optical recording medium | |
| JPH0336517A (en) | optical recording medium | |
| JPH0237527A (en) | optical card |