JPS60125944A - Recording medium - Google Patents
Recording mediumInfo
- Publication number
- JPS60125944A JPS60125944A JP58234521A JP23452183A JPS60125944A JP S60125944 A JPS60125944 A JP S60125944A JP 58234521 A JP58234521 A JP 58234521A JP 23452183 A JP23452183 A JP 23452183A JP S60125944 A JPS60125944 A JP S60125944A
- Authority
- JP
- Japan
- Prior art keywords
- state
- needle
- information
- alloy
- recording medium
- 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
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 14
- 229910045601 alloy Inorganic materials 0.000 claims description 13
- 239000000956 alloy Substances 0.000 claims description 13
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 10
- 238000005530 etching Methods 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 3
- 238000000034 method Methods 0.000 description 7
- 230000001678 irradiating effect Effects 0.000 description 4
- 239000010409 thin film Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 229910004337 Ti-Ni Inorganic materials 0.000 description 2
- 229910011209 Ti—Ni Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium oxide Inorganic materials O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 2
- KHYBPSFKEHXSLX-UHFFFAOYSA-N iminotitanium Chemical compound [Ti]=N KHYBPSFKEHXSLX-UHFFFAOYSA-N 0.000 description 2
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 229910052714 tellurium Inorganic materials 0.000 description 2
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 2
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 241000226585 Antennaria plantaginifolia Species 0.000 description 1
- HZEWFHLRYVTOIW-UHFFFAOYSA-N [Ti].[Ni] Chemical compound [Ti].[Ni] HZEWFHLRYVTOIW-UHFFFAOYSA-N 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- JCXGWMGPZLAOME-UHFFFAOYSA-N bismuth atom Chemical compound [Bi] JCXGWMGPZLAOME-UHFFFAOYSA-N 0.000 description 1
- WJCRZORJJRCRAW-UHFFFAOYSA-N cadmium gold Chemical compound [Cd].[Au] WJCRZORJJRCRAW-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical compound [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- OBACEDMBGYVZMP-UHFFFAOYSA-N iron platinum Chemical compound [Fe].[Fe].[Pt] OBACEDMBGYVZMP-UHFFFAOYSA-N 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- 238000001020 plasma etching Methods 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Substances [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 1
- 229920003217 poly(methylsilsesquioxane) Polymers 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052716 thallium Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/16—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by mechanical cutting, deforming or pressing
- G11B11/18—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by mechanical cutting, deforming or pressing with reproducing by optical means
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B13/00—Recording simultaneously or selectively by methods covered by different main groups among G11B3/00, G11B5/00, G11B7/00 and G11B9/00; Record carriers therefor not otherwise provided for; Reproducing therefrom not otherwise provided for
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
- ing And Chemical Polishing (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（ａ） 発明の技術分野
本発明は形状記憶合金を用いて形成した記録媒体の構成
に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field of the Invention The present invention relates to the structure of a recording medium formed using a shape memory alloy.
（ｂ） 技術の背景
形状記憶合金としてはチタン・ニッケル（ＴＩ−Ｎｉ）
合金、銅・アルミ、（ＣｕｓＡｔ）合金、銅・アルミ・
ニッケル（Ｃｕ−Ａｔ−Ｎ１）合金、金・カドミ（Ａｕ
・Ｃｄ）合金、鉄・白金（Ｆｅ、Ｐｔ）合金、インジウ
ム・タリウム（Ｉｎ−Ｔｔ）合金などが知られている。(b) Technology background Titanium-nickel (TI-Ni) is a shape memory alloy.
Alloy, copper/aluminum, (CusAt) alloy, copper/aluminum/
Nickel (Cu-At-N1) alloy, gold-cadmium (Au
・Cd) alloy, iron-platinum (Fe, Pt) alloy, indium-thallium (In-Tt) alloy, etc. are known.
これらの合金の組成で決る相転位温度以上では弾性体と
してまた常温では塑性体として振舞う性質をもっている
。例えばＴｉ−Ｎｉ合金の相転移温度は５０〜７０〔℃
〕であり、この温度以上に保持して任意の形状に成型し
た後急冷して常温に戻して変形させると形状記憶合金と
して動作する。These alloys have the property of behaving as elastic bodies above the phase transition temperature determined by their composition, and as plastic bodies at room temperature. For example, the phase transition temperature of Ti-Ni alloy is 50 to 70 [℃
], and if it is held above this temperature and molded into an arbitrary shape, then rapidly cooled, returned to room temperature, and deformed, it behaves as a shape memory alloy.
すなわち相転移温度以上にまで加熱すると元の成型状態
に戻すことができる。That is, heating to a temperature above the phase transition temperature can restore the original molded state.
本発明はこのような形状記憶合金を用いて作った記録媒
体ｌこ関するものである。The present invention relates to a recording medium made using such a shape memory alloy.
（ｃ） 従来技術と問題点
レーザ光を用いて情報の記録と再生を行う方法として光
ディスクがある。(c) Prior Art and Problems Optical discs are a method of recording and reproducing information using laser light.
すなわちガラス或はアクリル樹脂などの透明基板上にテ
ルル（Ｔｏ）、ビスマス（Ｂｉ）などの薄膜を形成し、
レーザ光を照射して穴開けを行う方法或は酸化テルル（
ＴｅＯＸ）、酸化ゲルマニウム（ＧｅＯｘ）などの非晶
質薄膜を形成し、これにレーザ光を照射して結晶質に相
転移させる場合に生ずる反射率の変化を利用して情報の
記録が行われている。That is, a thin film of tellurium (To), bismuth (Bi), etc. is formed on a transparent substrate such as glass or acrylic resin,
A method of drilling holes by irradiating laser light or using tellurium oxide (
Information is recorded by utilizing the change in reflectance that occurs when an amorphous thin film such as TeOX) or germanium oxide (GeOx) is irradiated with laser light to cause a phase transition to crystalline. There is.
然し薄膜に穴開は行う方法を用いる場合は情報の消去が
できず、一方反射率の変化を用いる方法では非晶質が経
年変化して結晶質に変化する場合があり、長期間の保管
性に問題がある。However, when using a method that involves punching holes in a thin film, information cannot be erased, and on the other hand, when using a method that uses changes in reflectance, the amorphous state may change over time and become crystalline, resulting in poor long-term storage. There is a problem.
（ｄ） 発明の目的
本発明は形状記憶合金を記録媒体に用いて情報の書き換
えが可能な記録媒体を提供することを目的とする。(d) Purpose of the Invention An object of the present invention is to provide a recording medium in which information can be rewritten using a shape memory alloy.
（ｅ） 発明の構成
本発明の目的は形状記憶合金からなるディスク基板の表
面を剣山状に選択エツチングして形成した多数の微少な
針状金属を記憶媒体として用い、該針状金属を一定方向
に倒した状態をＯＦＦ状態とし、またレーザ光を局部的
に照射して該合金の転移温度以上にまで上げて該針状金
属が直立状に復した状態をＯＮ状態として情報を記録せ
しめ、該記憶媒体に微少電力のレーザ光を照射して反射
率の変化から情報の読み出しを行うことを特徴とする記
憶合金により達成することができる。(e) Structure of the Invention The object of the present invention is to use, as a storage medium, a large number of minute metal needles formed by selectively etching the surface of a disk substrate made of a shape memory alloy into a crest shape, and to move the needles in a certain direction. The state in which the needle-shaped metal is tilted down is defined as the OFF state, and the state in which the needle metal returns to an upright state by locally irradiating a laser beam to raise the temperature above the transition temperature of the alloy is defined as the ON state, and information is recorded. This can be achieved using a memory alloy characterized by irradiating a storage medium with a laser beam of very low power and reading information from changes in reflectance.
（ｆ） 発明の実施例
本発明は形状記憶合金を用いて針状の突起をもつ剣山状
の記録媒体を作り、この針状の突起が彎曲しているか或
は直立しているかの形状の相違を情報の有無に対応させ
て情報の記録を行うものである。(f) Embodiments of the Invention The present invention uses a shape memory alloy to produce a recording medium in the shape of a pincushion having needle-like protrusions, and the shape of the needle-like protrusions varies depending on whether they are curved or upright. Information is recorded in correspondence with the presence or absence of information.
以下形状記憶合金としてＴ１・Ｎ１合金を用いた実施例
について本発明を説明する。The present invention will be described below with reference to an example in which a T1/N1 alloy is used as the shape memory alloy.
直径２０ （ｚ）、厚さ３〔調〕のＴｉ−Ｎｉ合金から
なるディスク基板１に１００〔℃〕の熱処理を施した後
急冷しておく。こ＼でＴ１・Ｎ１合金の相転移温度は５
０〜７０〔℃〕である。A disk substrate 1 made of a Ti-Ni alloy having a diameter of 20 (z) and a thickness of 3 [degrees] is heat treated at 100 [° C.] and then rapidly cooled. Here, the phase transition temperature of T1/N1 alloy is 5
The temperature is 0 to 70 [°C].
か＼るディスク基板１にスピンコード法により第１図（
４）に示すようにホトレジスト層２を形成した後同図（
Ｂ）に示すように露光と現像を行って直径約１．５（μ
ｍ〕のレジスト３からなるパターンを３ＣＡ−〕間隔に
ディスク基板１の全面に互って形成する。Figure 1 (
4) After forming the photoresist layer 2 as shown in the same figure (
Exposure and development were performed as shown in B) to obtain a diameter of approximately 1.5 (μ
Patterns made of resists 3 of 3 CA-] are formed alternately over the entire surface of the disk substrate 1 at intervals of 3 CA-].
次にアルゴン（Ａｒ）ガスと四塩化炭素（ＣＣｔ、）ガ
スを用いてリアクティブイオンエツチングを行い深さ約
５〔μｍ〕まで垂直にディスク基板１をエツチングする
同図（Ｃ）０次にレジスト３を溶解することにより微少
径の針状金属が剣山状に配列した記録媒体４ができ上る
。Next, reactive ion etching is performed using argon (Ar) gas and carbon tetrachloride (CCt) gas to vertically etch the disk substrate 1 to a depth of approximately 5 μm. By melting 3, a recording medium 4 in which needle-like metals of minute diameter are arranged in a crest shape is completed.
第２図はか＼る記録媒体４を表面にもつディスク基板１
を記録再生装置に取りつけた状態を示すもので、ディス
ク基板１はモータ５により回転すると共に上方には消去
針６を備えた消去器７と情報の記録と再生を行う対物レ
ンズ８１反射鏡９があり、図示を省略したレーザ光源よ
りのレーザ光１０は反射鏡９で反射後に対物レンズ８で
ディスク基板１上に集光されまた半径方向に移動できる
よう構成されている。Figure 2 shows a disk substrate 1 with a recording medium 4 on its surface.
The disk substrate 1 is rotated by a motor 5, and above there is an eraser 7 equipped with an erasing needle 6, an objective lens 81 for recording and reproducing information, and a reflecting mirror 9. A laser beam 10 from a laser light source (not shown) is reflected by a reflecting mirror 9, focused onto the disk substrate 1 by an objective lens 8, and is configured to be movable in the radial direction.
さて、本発明に係る記録媒体の情報記録は針状金属がデ
ィスク基板１に対し直立している状態をＯＮ、また彎曲
している状態をＯＦＦ’とし反射率の相違から情報の検
出を行うものである。Now, information is recorded on the recording medium according to the present invention by turning ON when the metal needle is upright with respect to the disk substrate 1, and OFF when it is curved, and detecting information from the difference in reflectance. It is.
第３図はこの状態を示すもので、情報の記録に先立って
消失−を行う必要がありこれはディスク基板１を回転さ
せた状態で消去針６を針状金属１１に触れるまで降下さ
せ針状金属１１の先端を彎曲することにより行われる。FIG. 3 shows this state. Prior to recording information, it is necessary to erase the information. This is done by lowering the erasing needle 6 until it touches the needle metal 11 while rotating the disk substrate 1. This is done by curving the tip of the metal 11.
すなわちこの場合はレーザ光は針状金属１１の彎曲部の
背面に投射されて反射される結果光の吸収は少く反射率
は最大となりでいる同図（Ａ）０次に情報の書き込みは
針状金属１１からなる記録媒体を選択的にレーザ照射し
て被照射部１２を形状記憶合金の相転移温度以上にまで
高めればよい。In other words, in this case, the laser beam is projected onto the back surface of the curved part of the needle-like metal 11 and is reflected, resulting in little light absorption and maximum reflectance. The recording medium made of the metal 11 may be selectively irradiated with a laser to raise the irradiated portion 12 to a temperature equal to or higher than the phase transition temperature of the shape memory alloy.
この方法として半導体レーザ或はヘリウム・ネオン（Ｈ
ａ−Ｎｏ）レーザの出力を２０ ［ｍｗ］程度きし対物
レンズ８で集光して数〔ｍ秒〕加熱すればよ１０
か＼る場合レーザ光の照射が行われた被照射部１２は加
熱されて容易に相転移温度を越えるため元の直立状態に
復元し、この状態ではレーザ光はエツチング孔内で繰り
返し反射し吸収されるため反射率が最小となる。This method uses a semiconductor laser or helium neon (H
a-No) If the output of the laser is about 20 [mw], the light should be focused by the objective lens 8 and heated for several [m seconds]. As it is heated and easily exceeds the phase transition temperature, it returns to its original upright state. In this state, the laser beam is repeatedly reflected and absorbed within the etching hole, so that the reflectance becomes minimum.
このようにして情報は反射率の変化を利用したＯＮ、Ｏ
ＦＦ信号により記録される。In this way, information is transmitted through ON and O using changes in reflectance.
Recorded by FF signal.
なお情報の読み出しは相転移を起さない電力、すなわち
本実施例の場合約１［ｍｗ）のレーザ光を照射してこの
反射光の強度を検出器で読みとることにより行われる。Note that the information is read by irradiating a laser beam with a power that does not cause a phase transition, that is, in the case of this embodiment, approximately 1 [mw], and reading the intensity of this reflected light with a detector.
また情報の消去は消去針６を用いて直立状態にある針状
金属１１を再び彎曲させればよい。Further, information can be erased by using the erasing needle 6 to bend the needle metal 11 which is in an upright state again.
（ｇ） 発明の効果
本発明は形状記憶合金を用いた記録媒体を提供するもの
で、本発明の使用により反復使用が可能なメモリの形成
が可能となる。(g) Effects of the Invention The present invention provides a recording medium using a shape memory alloy, and by using the present invention, it becomes possible to form a memory that can be used repeatedly.
第１図囚〜Ｃ）は本発明に係る記録媒体の形成工程を示
す断面図、第２図は書き込みおよび消去法を説明する斜
視図、また第３図（５）は情報の消去状態、同図（Ｂ）
は書き込み状態を示す断面図である。
図において、１はディスク基板、２はホトレジスト層、
４は記録媒体、６は消去針、８は対物レンズ、１０はレ
ーザ光、１１は針状金属、１２は被照射部。Figures 1-C) are cross-sectional views showing the process of forming a recording medium according to the present invention, Figure 2 is a perspective view illustrating the writing and erasing method, and Figure 3 (5) shows the state of information being erased. Diagram (B)
FIG. 2 is a cross-sectional view showing a written state. In the figure, 1 is a disk substrate, 2 is a photoresist layer,
4 is a recording medium, 6 is an erasing needle, 8 is an objective lens, 10 is a laser beam, 11 is a needle-like metal, and 12 is an irradiated part.
Claims (1)
択エツチングして形成した多数の微少な針状金属を記憶
媒体として用い、紋針状金属を一定方向に倒した状態を
ＯＦＦ状態とし、またレーザ光を局部的に照射して該合
金の転移温度以上にまで上げて該針状金属が直立状に復
した状態をＯＮ状態として情報を記録せしめ、該記憶媒
体に微少電力のレーザ光を照射して反射率の変化から情
報の読み出しを行うことを特徴とする記憶合金からなる
記録媒体。A large number of minute needle-shaped metals formed by selectively etching the surface of a disk substrate made of a shape memory alloy into a crest shape is used as a storage medium, and the state in which the needle-shaped metals are tilted in a certain direction is the OFF state. Light is irradiated locally to raise the temperature above the transition temperature of the alloy, and the state in which the acicular metal returns to an upright state is set as the ON state to record information, and the storage medium is irradiated with a laser beam of very low power. A recording medium made of a memory alloy, characterized in that information is read out from changes in reflectance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58234521A JPS60125944A (en) | 1983-12-13 | 1983-12-13 | Recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58234521A JPS60125944A (en) | 1983-12-13 | 1983-12-13 | Recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60125944A true JPS60125944A (en) | 1985-07-05 |
Family
ID=16972324
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58234521A Pending JPS60125944A (en) | 1983-12-13 | 1983-12-13 | Recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60125944A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61228989A (en) * | 1985-04-02 | 1986-10-13 | Hamamatsu Photonics Kk | Optical recording medium using shape memory alloy |
| EP0292675A2 (en) * | 1987-04-15 | 1988-11-30 | BASF Aktiengesellschaft | Irreversible optical recording media and method of manufacture |
| JPH05159357A (en) * | 1991-12-03 | 1993-06-25 | Nec Corp | Optical recording medium and its production |
-
1983
- 1983-12-13 JP JP58234521A patent/JPS60125944A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61228989A (en) * | 1985-04-02 | 1986-10-13 | Hamamatsu Photonics Kk | Optical recording medium using shape memory alloy |
| EP0292675A2 (en) * | 1987-04-15 | 1988-11-30 | BASF Aktiengesellschaft | Irreversible optical recording media and method of manufacture |
| JPH05159357A (en) * | 1991-12-03 | 1993-06-25 | Nec Corp | Optical recording medium and its production |
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