JPS6329341A - Information carrier disk - Google Patents
Information carrier diskInfo
- Publication number
- JPS6329341A JPS6329341A JP61172014A JP17201486A JPS6329341A JP S6329341 A JPS6329341 A JP S6329341A JP 61172014 A JP61172014 A JP 61172014A JP 17201486 A JP17201486 A JP 17201486A JP S6329341 A JPS6329341 A JP S6329341A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- refractive index
- resistant resin
- heat
- resin layer
- 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
- 239000000758 substrate Substances 0.000 claims abstract description 30
- 229920006015 heat resistant resin Polymers 0.000 claims abstract description 26
- 229920005989 resin Polymers 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 8
- 238000004528 spin coating Methods 0.000 abstract description 3
- 238000004299 exfoliation Methods 0.000 abstract 2
- 239000010410 layer Substances 0.000 description 68
- 229910010272 inorganic material Inorganic materials 0.000 description 5
- 239000011147 inorganic material Substances 0.000 description 5
- 239000010409 thin film Substances 0.000 description 3
- CERQOIWHTDAKMF-UHFFFAOYSA-M Methacrylate Chemical compound CC(=C)C([O-])=O CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 125000002723 alicyclic group Chemical group 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は円盤状の透明基板に記録媒体層を設け、光学的
に情報の記鎌、再生あるいは消去を行なう情報担体ディ
スク（以下、単にディスクと称す）の構造に関するもの
である。[Detailed Description of the Invention] Industrial Application Field The present invention relates to an information carrier disk (hereinafter simply referred to as a disk) in which a recording medium layer is provided on a disc-shaped transparent substrate, and information is recorded, reproduced, or erased optically. ).
従来の技術
従来より円盤状の透明基板からなるディスク基板の一方
の面に記録媒体層を形成し、ディスク基板側よシレーザ
光を照射することによって記録媒体層に微小な穴を形成
、あるいは光学的濃度を変化させたビットを形成して記
録再生を行なうディスクが実用化されている。更に記録
媒体層の光学的濃度を可逆的に変化させて繰り返し記録
、消去が可能な消去ディスクが実用化されつつある。Conventional technology Conventionally, a recording medium layer is formed on one side of a disc substrate made of a disc-shaped transparent substrate, and minute holes are formed in the recording medium layer by irradiating laser light from the disc substrate side, or optically. Discs on which recording and reproduction are performed by forming bits with varying densities have been put into practical use. Furthermore, erasing disks that allow repeated recording and erasing by reversibly changing the optical density of the recording medium layer are being put into practical use.
この消去ディスクの場合、記録媒体層をレーザ光によっ
てその融点以上に加熱した後、急冷あるいは徐冷して記
録、消去を行なうものであるため、１μｍ前後の微小な
領域ではあるが高温になりディスク基板に耐熱性の低い
樹脂材料を使用した場合、この熱によってディスク基板
が変形して記録。In the case of this erasing disc, recording and erasing are performed by heating the recording medium layer with a laser beam to a temperature above its melting point and then cooling it rapidly or gradually.As a result, a small area of around 1 μm becomes high temperature, causing the disc to become hot. If a resin material with low heat resistance is used for the substrate, the heat causes the disk substrate to deform and record.
消去の繰シ返しができないものであった。このためディ
スク基板と記録媒体層の間、あるいは記録媒体層とこの
記録媒体層を保獲する保護層との間に熱変形を防止する
ための断熱層を形成する必要があった。従来この断熱層
の材質について種々の提案がなされているが、いずれも
Ｓ ｚ ０２ 、Ｚ ｎ Ｓ 。It was impossible to erase the data repeatedly. Therefore, it is necessary to form a heat insulating layer between the disk substrate and the recording medium layer or between the recording medium layer and a protective layer that protects the recording medium layer to prevent thermal deformation. Conventionally, various proposals have been made regarding the material of this heat insulating layer, but all of them are S z 02 and Z n S .
Ａ Ｉ Ｎ 、Ｓ １３ Ｎａ等の無機材料からなるも
のであり、第２図に示すような構造になっていた。第２
図において１は透明な樹脂材料からなるディスク基板、
２はディスク基板１の一方の面に形成されたレーザ光案
内用のトラック溝、３はトラック溝２の上に形成された
第１の断熱層、４は第１の断熱層３の上に形成された記
録媒体層でその上に第２の断熱層５を形成しており、更
にこの第１の断熱層３゜記録媒体層４．第２の断熱層５
を保護するために、接着材６を介して保護板７を貼り合
わせている第２図の構成において矢印８の方向よりレー
ザ光を照射して記鎌、再生、消去を行なうものである（
例えば特開昭５９−１１００５２号公報）。It was made of inorganic materials such as A I N and S 13 Na, and had a structure as shown in FIG. Second
In the figure, 1 is a disk substrate made of a transparent resin material;
2 is a track groove for guiding laser light formed on one surface of the disk substrate 1, 3 is a first heat insulating layer formed on the track groove 2, and 4 is formed on the first heat insulating layer 3. A second heat insulating layer 5 is formed on the recording medium layer, and furthermore, this first heat insulating layer 3.degree. recording medium layer 4. Second insulation layer 5
In the structure shown in FIG. 2, in which a protective plate 7 is bonded together via an adhesive 6, a laser beam is irradiated from the direction of an arrow 8 to perform recording, reproduction, and erasing.
For example, Japanese Patent Application Laid-Open No. 59-110052).
発明が解決しようとする問題点
しかし、断熱層は無機材料であるため樹脂材料からなる
ディスク基板との間の熱膨張率の差は大きく、この熱膨
張率の差によってディスクの保存環境の変化あるいは記
録、消去を繰シ返した時のレーザ光の熱によって断熱層
とディスク基板の間ではがれあるいは微小な割れが発生
する問題点があった。特にこの微小な割れはトランク溝
のエッヂ部から発生しやすく繰り返し等の性能の劣化【
つながるものであった。また無機材料からなりその厚さ
が１０１００ｎ度の断熱層を形成する方法としては蒸着
法、スパッタ法等の薄膜形成法が必要であり、形成時間
が長い、あるいは形成装置が大型になるといった生産面
での問題点もあった。本発明は断熱層とディスク基板の
間のはがれあるいは微小な割れを防止し、繰り返し特性
に優れ、生産性にも優れたディスクを得ようとするもの
である。Problems to be Solved by the Invention However, since the heat insulating layer is made of an inorganic material, there is a large difference in the coefficient of thermal expansion between the heat insulating layer and the disk substrate made of a resin material. There is a problem in that the heat of the laser beam during repeated recording and erasing may cause peeling or minute cracks between the heat insulating layer and the disk substrate. In particular, these microscopic cracks tend to occur from the edges of the trunk groove, resulting in performance deterioration due to repeated use.
It was something that connected us. In addition, the method of forming a heat insulating layer made of inorganic material and having a thickness of 10100 nm requires a thin film forming method such as vapor deposition or sputtering, which requires a long time to form or a large forming device. There were also problems. The present invention aims to prevent peeling or minute cracks between the heat insulating layer and the disk substrate, and to obtain a disk with excellent repeatability and productivity.
問題点を解決するための手段
上記問題点を解決するため、本発明はレーザ光案内用の
トラック溝を有した円盤状の透明基板のトラック溝面に
、この透明基板の屈折率よシも屈折率が大きい高屈折率
薄層を前記トラック溝面に沿って形成し、この高屈折率
薄層の表面にその表面が平滑になるように耐熱樹脂層を
形成し、この耐熱樹脂層の上に記録媒体層を形成して構
成した情報担体ディスクである。Means for Solving the Problems In order to solve the above problems, the present invention provides a disc-shaped transparent substrate having track grooves for guiding laser light, and a track groove surface having a refractive index that is higher than the refractive index of the transparent substrate. A high refractive index thin layer with a large index is formed along the track groove surface, a heat resistant resin layer is formed on the surface of this high refractive index thin layer so that the surface is smooth, and on top of this heat resistant resin layer. This is an information carrier disk configured by forming a recording medium layer.
作 用
上記のように耐熱樹脂層を断熱層とすることによって、
熱膨張率の差によるディスク基板と断熱層の間のはがれ
、微小な割れを防止することができ、また断熱層の表面
を平滑にすることによって、その上に形成する記録媒体
層も平滑な層となりはかれ、微小な割れの発生しやすい
トランク溝のエッヂ部の影響を除去することができるも
のである。Effect By using the heat-resistant resin layer as a heat insulating layer as described above,
It is possible to prevent peeling and minute cracks between the disk substrate and the heat insulating layer due to differences in thermal expansion coefficients, and by making the surface of the heat insulating layer smooth, the recording medium layer formed on it can also be a smooth layer. On the other hand, it is possible to eliminate the influence of the edge portion of the trunk groove where minute cracks are likely to occur.
実施例 以下、本発明の一実施例を図面にもとづいて説明する。Example Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図において９はディスク基板で一方の面にレーザ光
案内用のトランク溝１０を形成している。１１はトラッ
ク溝１０にそって形成した屈折率が２．０以上の高屈折
率薄層、１２は熱変形温度２００℃以上の耐熱性を有し
た耐熱樹脂層でトラック溝１０を埋め込み、表面は平滑
に形成している。１３はＴｅＯｘ、Ｇｅ、Ｓｎの組成か
らなる相変化型の記録媒体層で例えばスパッタ法、蒸着
法等によって耐熱樹脂層１２の平滑な面に形成している
。１４は記録媒体層１３の上に形成した断熱層、１５は
保護板で接着材１６を全面に充填して貼り合わせてディ
スクを構成している。第１図の構成においてディスク基
板９はアクリル、ポリカーボネート等の透明樹脂材料が
使用でき、例えば射出成形法によって成形できるもので
ある。高屈折率薄層１１の役割は、例えば透明樹脂材料
からなるディスク基板嘗のトラック溝１ｏに直接、耐熱
樹脂層１２を形成した場合、両者共に樹脂材料であるた
めその屈折率は同程度であり、光学的にトラック溝１０
が検出できないものである。このためトラック溝１ｏの
上に屈折率が同程度の耐熱樹脂層１１を形成してもトラ
ック溝１０の検出ができるよう形成するものである。こ
のように高屈折率薄層１１を形成することによってトラ
ッキングは可能にな夛、材質も特に限定されるものでは
なく例えばＡＩ 、 Ｎｉ 、 Ｏｒ等の金属材料ある
いはＺｎＳ 、 Ａ７Ｎ 、 Ｔ ｉ○２等の無機材料
を使用することができるものである。具体的には、例え
ばＡｌｔ使用した場合、膜厚を１０ｎｍ以下にすること
によってレーザ光の透過率は８ｏチ以上になってトラッ
キングも可能なものであった。耐熱樹脂層１２を高屈折
率薄層１１を形成したトラック溝１０を埋め込み表面を
平滑になるように形成する方法としては例えば回転塗布
法によって耐熱樹脂材料の粘度１回転数２回転時間を選
ぶことによって、厚さ１μｍ程度で表面が平滑で均一な
膜厚の層を得ることができるものである。ま冷硬化方法
としては耐熱樹脂材料を紫外線硬化型の材料にすること
によって短時間で硬化させることは可能なものである。In FIG. 1, reference numeral 9 denotes a disk substrate having a trunk groove 10 for guiding laser light formed on one surface thereof. 11 is a high refractive index thin layer with a refractive index of 2.0 or more formed along the track groove 10, and 12 is a heat-resistant resin layer having heat resistance with a heat distortion temperature of 200°C or more, which fills the track groove 10, and the surface is It is formed smoothly. Reference numeral 13 denotes a phase change recording medium layer having a composition of TeOx, Ge, and Sn, and is formed on the smooth surface of the heat-resistant resin layer 12 by, for example, sputtering, vapor deposition, or the like. 14 is a heat insulating layer formed on the recording medium layer 13, and 15 is a protective plate whose entire surface is filled with an adhesive 16 and bonded together to form a disk. In the configuration shown in FIG. 1, the disk substrate 9 can be made of a transparent resin material such as acrylic or polycarbonate, and can be molded, for example, by injection molding. The role of the high refractive index thin layer 11 is that when the heat-resistant resin layer 12 is formed directly on the track groove 1o of a disk substrate made of a transparent resin material, for example, since both are resin materials, their refractive indexes are the same. , optically track groove 10
cannot be detected. Therefore, the track groove 10 is formed so that the track groove 10 can be detected even if the heat-resistant resin layer 11 having the same refractive index is formed on the track groove 1o. Tracking is made possible by forming the high refractive index thin layer 11 in this manner, and the material is not particularly limited, for example, metal materials such as AI, Ni, Or, etc., or ZnS, A7N, Ti○2, etc. Inorganic materials can be used. Specifically, when Alt was used, for example, by setting the film thickness to 10 nm or less, the transmittance of the laser beam became 8 degrees or more, making tracking possible. As a method of forming the heat-resistant resin layer 12 by burying the track groove 10 in which the high refractive index thin layer 11 is formed so as to make the surface smooth, for example, the heat-resistant resin material may be coated with a viscosity of 1 rotation speed and 2 rotation times using a spin coating method. By this method, a layer having a thickness of approximately 1 μm and a smooth surface and a uniform thickness can be obtained. As for the cold curing method, it is possible to cure the resin material in a short time by using an ultraviolet curing type material as the heat-resistant resin material.
この耐熱樹脂層１２の耐熱性に対し熱変形温度と記録、
消去の繰り返し特性について次の確認を行なった。Recording the heat distortion temperature for the heat resistance of this heat-resistant resin layer 12,
The following confirmation was made regarding the erase repetition characteristics.
実施例１
ディスク基板として熱変形温度が約１３０℃のポリカー
ボネートを使用し、直接記録媒体層を形成して記録パワ
ー８ ｍＷ 、消去パワー１６ｍＷで記録消去を行なっ
た結果、約１００回の繰９返しで基板に熱変形が発生し
、ノイズが大幅に増加した。Example 1 Polycarbonate with a heat deformation temperature of about 130°C was used as a disk substrate, a recording medium layer was directly formed, and recording and erasing was performed with a recording power of 8 mW and an erasing power of 16 mW, resulting in approximately 100 repetitions of 9. Thermal deformation occurred in the board and the noise increased significantly.
実施例２
耐熱樹脂層として熱変形温度が２３０℃の脂環式メタア
クリレートを使用し、上記実施例１と同様の評価を行な
った結果、１０４回の繰シ返しで熱変形によるノイズの
増加はなく良好な繰り返し特性を得た。Example 2 An alicyclic methacrylate with a heat distortion temperature of 230°C was used as the heat-resistant resin layer, and the same evaluation as in Example 1 was conducted. As a result, no increase in noise due to heat distortion was observed after 104 repetitions. Good repeatability was obtained.
実施例３
上記実施例１，２の結果にもとづき脂環式メタアクリレ
ートの組成比を変えて熱変形温度を１５０’Ｃ，１７０
℃、２００℃と変えて同様の評価を行なった結果、熱変
形温度を２００℃以上にすることによって熱変形による
ノイズの増加はなく良好な繰り返し特性を得ちれた。Example 3 Based on the results of Examples 1 and 2 above, the composition ratio of the alicyclic methacrylate was changed to increase the heat distortion temperature to 150'C and 170'C.
C. and 200.degree. C., and as a result, it was found that by setting the thermal deformation temperature to 200.degree. C. or higher, there was no increase in noise due to thermal deformation, and good repeatability was obtained.
以上の結果よシ樹脂材料の熱変形温度を２００℃以上に
することによって、無機材料からなる耐熱性の高い断熱
層を使用しなくても記録、消去の繰り返しによるレーザ
光の熱衝撃を防止できることを確認した。The above results show that by setting the thermal deformation temperature of the resin material to 200°C or higher, it is possible to prevent the thermal shock of laser light due to repeated recording and erasing without using a highly heat-resistant heat insulating layer made of inorganic material. It was confirmed.
ここで、記録、再生、消去はレーザ光１了をディスク基
板９の方向より照射し、前述したように高屈折率薄層１
１によってトラッキングを行ないながら、金属薄膜層１
１を透過したレーザ光１７で行なうものである。すなわ
ち記録の時にはスポット径１μｍ程度まで絞られたパワ
ー密度の高いレーザ光を照射することによシ、記録媒体
層１１は急熱、急冷されて反射率の低いアモルファス状
態となって情報ビットが形成される。消去の時には楕円
状に成形されたパワー密度の低いレーザ光を照射するこ
とによって記録媒体層は除熱、徐冷されて反射率の高い
結晶状態となって情報ビットが消去される。再生は記録
、消去時より低いパワーのレーザ光で、記録された情報
ビットを読取るものである。この時高屈折率薄層１１に
金属薄膜層を使用した場合記録、消去時の入射光及び再
生時の反射光は若干損失するが、膜厚が薄すためレーザ
光の損失は小さいものである。このように記録媒体層１
３はレーザ光の熱によってアモルファス状態と結晶状態
を繰り返すものであるため、トラック溝の段差があった
場合、その段差部分から記録媒体層の破れが発生すると
いった問題もあるが、耐熱樹脂層１２の平滑な面の上に
形成しているため、この問題に対しても効果がある。Here, for recording, reproduction, and erasing, a laser beam is irradiated from the direction of the disk substrate 9, and as described above, the high refractive index thin layer 1 is
1 while tracking the metal thin film layer 1.
This is performed using a laser beam 17 that has passed through the laser beam 17. That is, during recording, the recording medium layer 11 is rapidly heated and cooled to an amorphous state with low reflectance by irradiating it with a high-power-density laser beam focused to a spot diameter of about 1 μm, forming information bits. be done. During erasing, the recording medium layer is heated and slowly cooled by irradiation with a laser beam shaped into an ellipse and having a low power density, and becomes a crystalline state with high reflectance, thereby erasing information bits. During reproduction, recorded information bits are read using a laser beam of lower power than during recording and erasing. At this time, if a metal thin film layer is used as the high refractive index thin layer 11, there will be some loss of incident light during recording and erasing and reflected light during playback, but the loss of laser light will be small because the film thickness is thin. . In this way, recording medium layer 1
Since the heat-resistant resin layer 12 repeats between an amorphous state and a crystalline state due to the heat of the laser beam, there is a problem that if there is a step in the track groove, the recording medium layer may break from the step. Since it is formed on a smooth surface, it is also effective against this problem.
この実施例では相変化型の消去ディスクの例で述べたが
レーザ光の熱と磁界によって記録、再生。In this embodiment, we have described an example of a phase change type erasing disk, but recording and reproduction is performed using the heat of laser light and magnetic field.
消去を行なう光磁気ディスクにも応用できるものである
。It can also be applied to magneto-optical disks that perform erasing.
発明の効果
本発明は耐熱性を有した樹脂層を、ディスク基板のトラ
ック溝面に高屈折率薄層を介して表面が平滑になるよう
に形成して記録媒体層を形成することによって、ディス
ク基板と耐熱樹脂層の間の熱膨張率の差によるはがれあ
るいは微小な割れを防止することができ、繰り返し記録
、消去を行なった時のトランク溝゛の段差部分による記
録媒体層の破れを防止することもでき、桶り返し特性の
優れた信頼性のあるディスクを得ることができるもので
ある。また耐熱樹脂層は例えば回転塗布法で容易に短時
間で形成することができるため生産性にも優れたもので
ある。Effects of the Invention The present invention forms a recording medium layer by forming a heat-resistant resin layer on the track groove surface of a disk substrate via a high refractive index thin layer so that the surface is smooth. It can prevent peeling or minute cracks due to the difference in thermal expansion coefficient between the substrate and the heat-resistant resin layer, and prevent the recording medium layer from tearing due to the stepped portion of the trunk groove when repeatedly recording and erasing. It is also possible to obtain a reliable disk with excellent reversibility characteristics. Further, the heat-resistant resin layer can be easily formed in a short time by, for example, a spin coating method, and therefore has excellent productivity.
第１図は本発明の一実施例における情報担体ディスクの
断正面図、第２図は従来例における情報担体ディスクの
断正面図である。
９・・・・・・ディスク基板、１ｏ・・・・・・トラッ
ク溝、１１・・・・・・高屈折率薄層、１２・・・・・
・耐熱樹脂層、１３・・・・・・記録媒体層。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図FIG. 1 is a sectional front view of an information carrier disk in an embodiment of the present invention, and FIG. 2 is a sectional front view of an information carrier disk in a conventional example. 9...Disc substrate, 1o...Track groove, 11...High refractive index thin layer, 12...
- Heat-resistant resin layer, 13...Recording medium layer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2
Claims (1)
のトラック溝面に、この透明基板の屈折率よりも屈折率
が大きい高屈折率薄層を前記トラック溝面に沿つて形成
し、この高屈折率薄層の表面に、その表面が平滑になる
ように耐熱樹脂層を形成し、この耐熱樹脂層の上に記録
媒体層を形成した情報担体ディスク。 ２）耐熱性樹脂層を熱変形温度が２００℃以上の耐熱性
を有した樹脂層とした特許請求の範囲第１項記載の情報
担体ディスク。[Claims] 1) A high refractive index thin layer having a refractive index higher than that of the transparent substrate is applied to the track groove surface of a disk-shaped transparent substrate with track grooves formed on one surface. , a heat-resistant resin layer is formed on the surface of this high refractive index thin layer so that the surface is smooth, and a recording medium layer is formed on this heat-resistant resin layer. 2) The information carrier disk according to claim 1, wherein the heat-resistant resin layer is a resin layer having heat resistance with a heat distortion temperature of 200° C. or higher.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61172014A JPS6329341A (en) | 1986-07-22 | 1986-07-22 | Information carrier disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61172014A JPS6329341A (en) | 1986-07-22 | 1986-07-22 | Information carrier disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6329341A true JPS6329341A (en) | 1988-02-08 |
Family
ID=15933928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61172014A Pending JPS6329341A (en) | 1986-07-22 | 1986-07-22 | Information carrier disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6329341A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5878022A (en) * | 1996-09-13 | 1999-03-02 | Nec Corporation | High density optical information recording medium using high refractive index layer |
| US5919799A (en) * | 1995-03-13 | 1999-07-06 | Nikken Chemicals Co., Ltd. | Imidazothiazole compound |
-
1986
- 1986-07-22 JP JP61172014A patent/JPS6329341A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5919799A (en) * | 1995-03-13 | 1999-07-06 | Nikken Chemicals Co., Ltd. | Imidazothiazole compound |
| US5878022A (en) * | 1996-09-13 | 1999-03-02 | Nec Corporation | High density optical information recording medium using high refractive index layer |
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