JPH01211285A - Rejection processing material for draw type optical disk - Google Patents
Rejection processing material for draw type optical diskInfo
- Publication number
- JPH01211285A JPH01211285A JP63032827A JP3282788A JPH01211285A JP H01211285 A JPH01211285 A JP H01211285A JP 63032827 A JP63032827 A JP 63032827A JP 3282788 A JP3282788 A JP 3282788A JP H01211285 A JPH01211285 A JP H01211285A
- Authority
- JP
- Japan
- Prior art keywords
- disk
- optical disk
- drug
- base material
- rejection processing
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 37
- 230000003287 optical effect Effects 0.000 title claims abstract description 27
- 239000000126 substance Substances 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 abstract description 9
- -1 polyethylene Polymers 0.000 abstract description 9
- 229920000573 polyethylene Polymers 0.000 abstract description 9
- 239000003814 drug Substances 0.000 abstract description 8
- 229940079593 drug Drugs 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 abstract description 5
- 238000003825 pressing Methods 0.000 abstract description 3
- 239000004820 Pressure-sensitive adhesive Substances 0.000 abstract 1
- 230000001850 reproductive effect Effects 0.000 abstract 1
- 239000002699 waste material Substances 0.000 description 13
- 239000002904 solvent Substances 0.000 description 12
- 239000002390 adhesive tape Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000001678 irradiating effect Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 229920000298 Cellophane Polymers 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000003094 microcapsule Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000002982 water resistant material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、使用済みの追記型光ディスクの読み取りが行
なえなくなるようにして再使用の防止を可能にした追記
型光ディスク用廃棄処理材に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a waste treatment material for a used write-once optical disc, which makes it impossible to read a used write-once optical disc and thereby prevents its reuse.
コンピュータの外部記憶装置には、従来、磁気テープ、
磁気ディスク等の磁気記録媒体が主として用いられてき
たが、近年、高密度大容量化が可能で保存寿命が長く且
つ磁気の影響を受けない光ディスクが注目されている。Traditionally, external storage devices for computers include magnetic tape,
Magnetic recording media such as magnetic disks have been mainly used, but in recent years, optical disks that are capable of high density and large capacity, have a long shelf life, and are not affected by magnetism have attracted attention.
光ディスクは、再生専用型、追記型及び書き換１′え型
の３種に大別できる。これらの中で追記型は、−度だけ
書き込みが可能で消去が不可能な構造を有するものであ
るが、例えば銀行業務等に需要が見込まれている。Optical discs can be roughly divided into three types: read-only type, write-once type, and rewritable type. Among these, the write-once type has a structure that allows writing only once but cannot be erased, and is expected to be in demand for example in banking.
第１２図および第１３図は追記型光ディスクの一例を示
す断面図およびピット形成部の詳細を示す拡大断面図で
ある。FIGS. 12 and 13 are a cross-sectional view showing an example of a write-once optical disc, and an enlarged cross-sectional view showing details of a pit forming portion.
この種の追記型光ディスクは、トラッキング信号に対応
するグループ（案内手段）及びアドレス信号に対応する
プレピット（例えば、凹み）が予じめ形成されており、
これらの信号をレーザビーム等を用いた光学的手段によ
って読み出しつつ情報信号を記録する溝成が通常とられ
ている。In this type of write-once optical disc, a group (guiding means) corresponding to a tracking signal and a pre-pit (for example, a recess) corresponding to an address signal are formed in advance.
A groove structure is generally used in which information signals are recorded while reading these signals by optical means using a laser beam or the like.
第１２図、第１３図に示すようにディスク基板２１の片
面に三角溝状のグループ２２が螺旋状に形成されており
、該グループ２２上にグループ２２よりも深い矩形溝状
のプレピット２３が配設されている。そして、上記ディ
スク基板２１の上記グループ２２及びプレピット２３の
形成面に記録層２４が形成されて、１枚の記録媒体が構
成される。As shown in FIGS. 12 and 13, a triangular groove-shaped group 22 is spirally formed on one side of the disk substrate 21, and a rectangular groove-shaped prepit 23 deeper than the group 22 is arranged on the group 22. It is set up. Then, a recording layer 24 is formed on the surface of the disk substrate 21 on which the groups 22 and pre-pits 23 are formed, thereby forming one recording medium.
さらに、この光情報記録ディスクにおいては、上記記録
層２４を内向きにし、かつこれら記録Ｎ２４゜２４の間
に空隙２５が形成されるようにして、２枚のディスク基
板２１．２１の内周部及び外周部が接合されている。Further, in this optical information recording disk, the recording layer 24 is turned inward, and a gap 25 is formed between these recording layers N24. and the outer periphery are joined.
上記の光情報記録ディスクにおいては、上記グループ２
２に沿って記録用放射線ビームを照射することによって
、第１３図に示すように、グループ２２の裏側に記録ピ
ット２６が開設される。また、上記のようにして記録ピ
ット２６が開設された記録済みディスク２７のグループ
２２に沿って再生用放射線ビームを照射することによっ
て、情報信号を読み出すことができる。また、光情報記
録ディスクを反転することによって、即ち、放射線ビー
ム入射側を入り換えることによって、２つの記録層２４
．２４に情報を記録することができる。In the above optical information recording disc, the above group 2
By irradiating the recording radiation beam along the group 22, a recording pit 26 is opened on the back side of the group 22, as shown in FIG. Moreover, the information signal can be read by irradiating the reproduction radiation beam along the group 22 of the recorded disk 27 in which the recording pit 26 has been established as described above. Furthermore, by reversing the optical information recording disk, that is, by switching the radiation beam incident side, the two recording layers 24
．． Information can be recorded in 24.
ところで、記録がなされておりならが廃棄処分にされた
追記型光ディスクは、記録内容を消去することができな
いため、原型を止どめた状態のまま処分した場合には第
３者の手に渡って悪用される等の恐れがある。このため
、従来においては、ディスク使用者が廃棄時に切断機等
を用いて切断し、再使用を不可能にし、未然に事故等の
防止を図っている。By the way, write-once optical discs that have been recorded and then disposed of cannot be erased, so if they are disposed of with the original format still intact, they may end up in the hands of a third party. There is a risk that it may be misused. For this reason, conventionally, disk users cut the disk using a cutter or the like when disposing of the disk, making it impossible to reuse the disk, in order to prevent accidents and the like.
しかし、追記型光ディスクに対する従来の再使用防止手
段は、ディスクの切断のために大型の切断装置を用いる
必要がある。このため、設置スペースを取られると共に
切断装置等の購入のために相当な費用を負担せねばなら
ない不都合がある。However, conventional reuse prevention means for write-once optical discs require the use of a large cutting device to cut the disc. For this reason, there is an inconvenience that not only installation space is taken up but also a considerable amount of cost must be borne for purchasing the cutting device and the like.
本発明は、上記従来技術の実情に鑑みてなされたもので
、簡単かつ小型な構成によりディスクの再使用防止を可
能にする追記型光ディスク用廃棄処理材を提供すること
を目的とする。The present invention has been made in view of the above-mentioned state of the prior art, and an object of the present invention is to provide a waste disposal material for write-once optical discs that enables prevention of reuse of discs with a simple and compact configuration.
上記目的を達成するために本発明は、ディスク表面を溶
解又は変質可能な薬剤をベース材に保持させるようにし
たものである。In order to achieve the above object, the present invention allows a base material to hold a drug capable of dissolving or altering the disk surface.
本発明によれば、ベース材に保持された薬剤はディスク
表面に接触することにより、ディスク表面を溶解または
変質させ、ディスク表面を例えば不透明にし、読取用ビ
ーム光の通過を妨げ、データの読み出しを防止すること
ができる。According to the present invention, when the drug held on the base material comes into contact with the disk surface, it dissolves or alters the disk surface, making the disk surface opaque, for example, and blocking the passage of the reading beam light, thereby making it impossible to read data. It can be prevented.
以下、本発明の一実施例を図面に基づいて説明する。 Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図は本発明の一実施例を示す斜視図であり、第２図
は第り図ｎ−ｎ矢視断面における分解組立図である。FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is an exploded view of the cross section taken along the line nn in FIG.
第１図及び第２図に示すように、ポリエチレン等の耐水
性の材料を用いたベース材１の周縁に両面粘着テープ２
が連続的に粘着されている。この両面粘着テープ２で囲
繞されたスペース内にポリエチレンシート３を***とす
るゲル状溶剤４が充填されている。ゲル状液剤４は廃棄
対象の追記型光ディスクの読出し面（ポリカーボネート
樹脂、エポキシ樹脂等の材料が用いられる）に付着した
際に、その表面が白濁化するように溶解または変質させ
うる溶液をゲル化させたものである。As shown in FIGS. 1 and 2, double-sided adhesive tape 2 is attached to the periphery of a base material 1 made of a water-resistant material such as polyethylene.
are continuously attached. A space surrounded by this double-sided adhesive tape 2 is filled with a gel-like solvent 4 surrounded by a polyethylene sheet 3. The gel-like liquid agent 4 is a solution that, when attached to the readout surface (materials such as polycarbonate resin and epoxy resin are used) of the write-once optical disk to be discarded, can dissolve or change the quality of the disk so that the surface becomes cloudy. This is what I did.
ポリエチレンシート３は、封入したゲル状溶剤４が通常
時には密封された状態にあり、使用時（ゲル状溶剤４を
廃棄対象ディスクに圧接させた状態）に滲出するように
ベース材１に固着されている。このために、例えば、固
着面に溝を設け、或いは加圧時にのみ滲出可能な微細な
穴、さらには加圧によって破砕する構造等をポリエチレ
ンシート３に施している。The polyethylene sheet 3 is fixed to the base material 1 so that the gelled solvent 4 enclosed therein is normally in a sealed state, and oozes out during use (when the gelled solvent 4 is pressed against the disk to be disposed of). There is. For this purpose, for example, the polyethylene sheet 3 is provided with grooves on the fixing surface, minute holes that allow water to seep out only when pressure is applied, or a structure that breaks when pressure is applied.
このポリエチレンシート３を覆うようにし、且つ剥離可
能に剥離紙５が両面粘着テープ２に貼着されている。な
お、６はベース材１の一辺に突設されている指摘み部で
あり、後述するディスク廃棄処理の作業を容易にするこ
とができる。A release paper 5 is attached to the double-sided adhesive tape 2 so as to cover the polyethylene sheet 3 and to be peelable. Note that reference numeral 6 indicates a pointing portion protruding from one side of the base material 1, which can facilitate the disk disposal process described later.
次に、以上の構成による廃棄処理材の使用法について説
明する。Next, a method of using the waste treatment material with the above configuration will be explained.
第１図の如くに構成された廃棄処理材１０は、剥離紙５
を両面粘着テープ２より剥がし、指摘み部６を持って第
３図のように廃棄対象の追記型光ディスク２０の表面に
貼着する（ベース材１が表になる状態に貼着する）。次
に、ベース材１の中央部を押圧することにより、ゲル状
液剤４がポリエチレンシート３外に滲出し、滲出した液
剤４は追記型光ディスク２０の表面に接触し、その接触
面を溶解させ、白濁化する。したがって廃棄処理材１０
を剥がしても、その表面が不透明に変化しているため、
データを読み出そうとしても、読取用のビーム光が遮断
あるいは乱反射され、データが読み取られることは無い
。The waste treatment material 10 configured as shown in FIG.
Peel off the tape from the double-sided adhesive tape 2, hold the pointing part 6, and stick it to the surface of the write-once optical disk 20 to be discarded as shown in FIG. 3 (stick it with the base material 1 facing up). Next, by pressing the center part of the base material 1, the gel-like liquid agent 4 exudes out of the polyethylene sheet 3, and the exuded liquid agent 4 contacts the surface of the write-once optical disc 20 and dissolves the contact surface. It becomes cloudy. Therefore, waste treatment material 10
Even if you peel it off, the surface remains opaque, so
Even if an attempt is made to read data, the reading beam light is blocked or diffusely reflected, and the data cannot be read.
廃棄処理材１０は、廃棄処理効果を確実にするために、
第３図に示すように複数を用いるのが好ましい。In order to ensure the waste treatment effect, the waste treatment material 10 has the following features:
It is preferable to use a plurality of them as shown in FIG.
なお、以上の実施例においては、剥離紙５がベース材１
と同一サイズの単独紙としたが、廃棄処理材１０を頻繁
に用いる場合には、使い勝手及び保管の便を考えた第４
図の如き構成が適している。In addition, in the above embodiment, the release paper 5 is the base material 1.
However, if the waste treatment material 10 is used frequently, a fourth sheet of paper with the same size as the
The configuration shown in the figure is suitable.
すなわち、帯状の剥離紙７に部材２〜４を装着したベー
ス材ｌを連続的に貼着し、この剥離紙７をリール８に巻
回して構成される。使用に際しては、剥離紙７よりベー
ス材１側を指摘み部６を持ち上げるようにして剥離する
。剥離枚数が増えるにつれて剥離紙７の使用済み部分が
多くなるが、適宜ハサミ等によって切断除去すればよい
。That is, the base material 1 on which the members 2 to 4 are attached is continuously attached to a strip-shaped release paper 7, and the release paper 7 is wound around a reel 8. In use, the base material 1 side is peeled off from the release paper 7 by lifting up the pointing part 6. As the number of sheets to be peeled increases, the used portion of the release paper 7 increases, but it may be removed by cutting it with scissors or the like as appropriate.
また、廃棄処理材１０は、四角形状の例を示したが、第
５図〜第７図に示すような形状にしてもよい。第５図は
円形の例、第６図はディスクのデータ列半径に合せた形
状、第７図は扇形にし半径方向の所定領域に同時に貼着
できるようにした形状を各々示している。Further, although the waste treatment material 10 has a rectangular shape as an example, it may have a shape as shown in FIGS. 5 to 7. FIG. 5 shows an example of a circular shape, FIG. 6 shows a shape that matches the radius of the data row of the disk, and FIG. 7 shows a fan-shaped shape that can be attached simultaneously to a predetermined area in the radial direction.
さらに、第８図に示すように、ベース材１の表面に廃棄
処理を行なったものであることを取扱者及び第３者に明
示できるように、廃棄対象ディスクであることを意味す
る語句を記載したステッカ９を貼着し、或いは印刷を施
すこともできる。Furthermore, as shown in Fig. 8, words and phrases indicating that the disc is subject to disposal are written on the surface of the base material 1 so that it can be clearly shown to the handler and third parties that the disc has undergone disposal treatment. It is also possible to attach a sticker 9 or print it.
第９図は本発明の他の実施例を示す斜視図、第１０図は
第９図のＸ−Ｘ矢視断面図である。FIG. 9 is a perspective view showing another embodiment of the present invention, and FIG. 10 is a sectional view taken along the line X--X in FIG. 9.
第９図及び第１０図に示すように、テープ状のポリエチ
レン等によるベース材１１の片面の両側縁に２条の両面
粘着テープ１２が貼られ、この両面粘着テープ１２間に
ゲル状溶剤１３を均一な厚みに塗布し、これをセロハン
テープのように巻回して廃棄処理材１５が構成される。As shown in FIGS. 9 and 10, two strips of double-sided adhesive tape 12 are pasted on both sides of one side of a base material 11 made of tape-shaped polyethylene, etc., and a gel-like solvent 13 is applied between the double-sided adhesive tapes 12. The waste treatment material 15 is constructed by applying it to a uniform thickness and winding it like cellophane tape.
ベース材１１及び両面粘着テープ１２には、一定の長さ
毎にミシン目１４が入れられており、所望の長さにおい
て切断できるようにされている。ゲル状溶剤１３は、所
定の粘度を有しているため、切口部から流出する恐れは
無い。また、ベース材層間より露出するゲル状溶剤１３
の面積は極めて小さいため、溶剤が空気に触れて固化す
るのはわずかであり、長時間放置しても次の廃棄処理に
影響を与えることは無い。The base material 11 and the double-sided adhesive tape 12 are provided with perforations 14 at regular intervals so that they can be cut at a desired length. Since the gel-like solvent 13 has a predetermined viscosity, there is no risk of it flowing out from the cut portion. In addition, the gel-like solvent 13 exposed from between the base material layers
Since the area of the solvent is extremely small, there is only a small amount of solidification of the solvent when it comes into contact with the air, and even if it is left for a long time, it will not affect the next disposal process.
次に、第９図の°実施例の使用法について説明する。Next, how to use the embodiment shown in FIG. 9 will be explained.
第１１図に示すように、廃棄対象の追記型光ディスク２
０の表面に、巻回された本体部より引き出した廃棄処理
材１５を必要な長さだけ貼着し、ミシン目１４よりカッ
トする。貼着された廃棄処理材１５の表面をディスク面
へ押圧したのち、ディスク面より剥がすことにより、前
記実施例と同様に溶剤接触面が溶解し、ディスク表面を
不透明状態にする。したがって、記録されているデータ
の読み出しはできず、再使用される恐れはない。As shown in FIG. 11, the write-once optical disc 2 to be discarded
A required length of waste treatment material 15 pulled out from the wound main body is pasted on the surface of 0, and cut from the perforation 14. By pressing the surface of the adhered waste treatment material 15 against the disk surface and then peeling it off from the disk surface, the solvent contact surface is dissolved and the disk surface becomes opaque as in the previous embodiment. Therefore, the recorded data cannot be read and there is no possibility of it being reused.
本実施例は、ゲル状溶剤Ｉ３を連続に所望の長さにディ
スク面に回着させることができるため、ＣＤ（コンパク
トディスク）等の径の異なるものにも用いることができ
る。In this embodiment, since the gel-like solvent I3 can be continuously spun onto the disc surface to a desired length, it can also be used for discs with different diameters, such as CDs (compact discs).
なお、いずれの実施例もディスクの一部を不透明化し、
ディスク全面に及ぶものでは無いが、読み出し途中に１
ケ所でも読み出し不可能な場所があれば、続出装置はエ
ラー状態になり、読み出しが不可能になるので問題は無
い。In addition, in each example, a part of the disk is made opaque,
Although it does not cover the entire disk, 1 error occurs during reading.
If there is a location where reading is not possible, the successive device enters an error state and reading becomes impossible, so there is no problem.
また、薬剤としてゲル状溶剤の例を示したが、このほか
、布等に含浸させ、或いは破砕が容易な材料で作られた
マイクロカプセル等に封入する等の構成にしてもよい。Further, although a gel-like solvent is shown as an example of the drug, it may also be impregnated into cloth or the like, or encapsulated in microcapsules or the like made of a material that is easily crushed.
以上説明した通り、本発明によれば、光ディスクの表面
を化学的に変化させることのできる薬剤をベース剤に保
持させ、この薬剤をディスク表面へ接触させうるように
したので、追記型光ディスクの再使用の防止、すなわち
廃棄処分を簡単な構成によってローコストに行なうこと
ができる。As explained above, according to the present invention, a base agent holds a chemical that can chemically change the surface of an optical disc, and this chemical can be brought into contact with the disc surface, so that write-once optical discs can be reused. Prevention of use, that is, disposal can be done at low cost with a simple configuration.
第１図は本発明の一実施例を示す斜視図、第２図は第１
図の実施例のＩｆ−ＩＩ矢視断面における分解組立図、
第３図は第１図の実施例の使用状態を示す斜視図、第４
図は第１図の実施例の変形例を示す斜視図、第５図〜第
７図は本発明に係る廃棄処理材の他の形状例を示す平面
図、第８図は第１図の実施例に廃棄処分の明示する語句
を付加した例を示す平面図、第９図は本発明の他の実施
例を示す斜視図、第１０図は第９図の実施例のＸ−Ｘ矢
視断面図、第１１図は第９図の実施例の使用状態を示す
斜視図、第１２図は追記型光ディスクの一例を示す断面
図、第１３図は第１２図のディスクのピット形成部の詳
細を示す拡大断面図である。
１．１１・・・・・・ベース材、２．１２・・・・・・
両面粘着テープ、３・・・・・・ポリエチレンシート、
４．１３・・・・・・ゲル状溶剤、５，７・・・・・・
剥離紙、８・・・・・・リール、１０．１５・・・・・
・廃棄処理材、２０・・・・・・追記型光ディスク。
第１図
Ｉ〈
第２図
第４図
第５図 第６図
第９＠
第１０図
Ｉ
第１１図
第１２５！！！
第１３図FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
An exploded assembly view of the embodiment shown in the If-II arrow cross section,
Fig. 3 is a perspective view showing the usage state of the embodiment shown in Fig. 1;
The figure is a perspective view showing a modification of the embodiment shown in Fig. 1, Figs. FIG. 9 is a perspective view showing another embodiment of the present invention, and FIG. 10 is a cross section taken along the line X-X of the embodiment shown in FIG. 9. 11 is a perspective view showing the usage state of the embodiment shown in FIG. 9, FIG. 12 is a sectional view showing an example of a write-once optical disk, and FIG. 13 shows details of the pit forming portion of the disk shown in FIG. 12. FIG. 1.11...Base material, 2.12...
Double-sided adhesive tape, 3... Polyethylene sheet,
4.13... Gel solvent, 5,7...
Release paper, 8...Reel, 10.15...
・Waste disposal material, 20...Writable optical disc. Figure 1 I < Figure 2 Figure 4 Figure 5 Figure 6 Figure 9 @ Figure 10 I Figure 11 Figure 125! ! ! Figure 13
Claims (1)
とが可能な薬剤と、可撓性を有するベース材と、該ベー
ス材に前記薬剤を保持する手段とを具備することを特徴
とする追記型光ディスク用廃棄処理材。Disposal for a write-once optical disc, characterized by comprising a chemical capable of dissolving or altering the signal readout surface of an optical disc, a flexible base material, and means for holding the chemical on the base material. Processed material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63032827A JPH01211285A (en) | 1988-02-17 | 1988-02-17 | Rejection processing material for draw type optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63032827A JPH01211285A (en) | 1988-02-17 | 1988-02-17 | Rejection processing material for draw type optical disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01211285A true JPH01211285A (en) | 1989-08-24 |
Family
ID=12369659
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63032827A Pending JPH01211285A (en) | 1988-02-17 | 1988-02-17 | Rejection processing material for draw type optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01211285A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6011772A (en) * | 1996-09-16 | 2000-01-04 | Spectradisc Corporation | Machine-readable optical disc with reading-inhibit agent |
| US6338933B1 (en) | 1998-06-25 | 2002-01-15 | Spectradisc Corporation | Methods and apparatus for rendering an optically encoded medium unreadable |
| US6477134B1 (en) * | 1998-06-29 | 2002-11-05 | Recording Industry Association Of America | Security marking system and method for minimizing pirating of data on data media including compact discs and digital versatile discs |
| US6531262B1 (en) | 1998-06-25 | 2003-03-11 | Spectradisc Corporation | Methods and apparatus for rendering an optically encoded medium unreadable and tamper-resistant |
| US6747930B1 (en) | 1996-12-24 | 2004-06-08 | Hide & Seek Technologies, Inc. | Data protection on an optical disk |
| WO2006027921A1 (en) * | 2004-09-03 | 2006-03-16 | Kazuma Toyama | Disc-type information recording medium, and magnetic card discarding method and device capable of disabling reading of information |
-
1988
- 1988-02-17 JP JP63032827A patent/JPH01211285A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6011772A (en) * | 1996-09-16 | 2000-01-04 | Spectradisc Corporation | Machine-readable optical disc with reading-inhibit agent |
| US6434109B2 (en) * | 1996-09-16 | 2002-08-13 | Spectradisc Corporation | Machine-readable optical disc with reading-inhibit agent |
| US6747930B1 (en) | 1996-12-24 | 2004-06-08 | Hide & Seek Technologies, Inc. | Data protection on an optical disk |
| US6338933B1 (en) | 1998-06-25 | 2002-01-15 | Spectradisc Corporation | Methods and apparatus for rendering an optically encoded medium unreadable |
| US6531262B1 (en) | 1998-06-25 | 2003-03-11 | Spectradisc Corporation | Methods and apparatus for rendering an optically encoded medium unreadable and tamper-resistant |
| US6709802B2 (en) | 1998-06-25 | 2004-03-23 | Flexplay Technologies, Inc. | Methods and apparatus for rendering an optically encoded medium unreadable |
| US6477134B1 (en) * | 1998-06-29 | 2002-11-05 | Recording Industry Association Of America | Security marking system and method for minimizing pirating of data on data media including compact discs and digital versatile discs |
| WO2006027921A1 (en) * | 2004-09-03 | 2006-03-16 | Kazuma Toyama | Disc-type information recording medium, and magnetic card discarding method and device capable of disabling reading of information |
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