JPH02216630A - Optical information recording medium - Google Patents
Optical information recording mediumInfo
- Publication number
- JPH02216630A JPH02216630A JP63248119A JP24811988A JPH02216630A JP H02216630 A JPH02216630 A JP H02216630A JP 63248119 A JP63248119 A JP 63248119A JP 24811988 A JP24811988 A JP 24811988A JP H02216630 A JPH02216630 A JP H02216630A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- layer
- thin film
- base material
- transparent
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims description 31
- 239000010410 layer Substances 0.000 claims abstract description 136
- 239000000463 material Substances 0.000 claims abstract description 39
- 239000010409 thin film Substances 0.000 claims abstract description 26
- 230000008018 melting Effects 0.000 claims abstract description 23
- 238000002844 melting Methods 0.000 claims abstract description 23
- 239000011241 protective layer Substances 0.000 claims abstract description 19
- 230000009477 glass transition Effects 0.000 claims abstract description 5
- 239000000155 melt Substances 0.000 claims abstract 5
- 239000000126 substance Substances 0.000 claims description 15
- 239000010408 film Substances 0.000 claims description 10
- 230000008859 change Effects 0.000 claims description 8
- 229910052810 boron oxide Inorganic materials 0.000 claims description 6
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 4
- 229910052714 tellurium Inorganic materials 0.000 claims description 4
- 239000005388 borosilicate glass Substances 0.000 claims description 3
- 229910052711 selenium Inorganic materials 0.000 claims description 2
- 239000006104 solid solution Substances 0.000 claims description 2
- 150000004770 chalcogenides Chemical class 0.000 claims 1
- 239000000428 dust Substances 0.000 abstract description 8
- 230000006378 damage Effects 0.000 abstract description 7
- 239000012780 transparent material Substances 0.000 abstract description 5
- 230000008602 contraction Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 239000012790 adhesive layer Substances 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 238000005191 phase separation Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000007704 transition Effects 0.000 description 3
- -1 ZnS Chemical class 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000005387 chalcogenide glass Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000003989 dielectric material Substances 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 150000004763 sulfides Chemical class 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 238000004017 vitrification Methods 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910005900 GeTe Inorganic materials 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 238000004833 X-ray photoelectron spectroscopy Methods 0.000 description 1
- 238000005280 amorphization Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000005566 electron beam evaporation Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- WPYVAWXEWQSOGY-UHFFFAOYSA-N indium antimonide Chemical compound [Sb]#[In] WPYVAWXEWQSOGY-UHFFFAOYSA-N 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910000464 lead oxide Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000012782 phase change material Substances 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 230000001012 protector Effects 0.000 description 1
- 239000005297 pyrex Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000011669 selenium Substances 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
３、産業上の利用分野
本発明はレーザー光線等の高密度エネルギー束の照射に
よって情報を記録し、再生する書き換え可能な光学情報
記録媒体の構成に関するものである。DETAILED DESCRIPTION OF THE INVENTION 3. Field of Industrial Application The present invention relates to the structure of a rewritable optical information recording medium that records and reproduces information by irradiation with a high-density energy flux such as a laser beam.
従来の技術
書き換え可能な光学情報記録媒体の記録層に用いる記録
材料の一つとして相変化材料と総称される材料群がある
０例えばアモルファス相と結晶相の間の、あるいは結晶
相ともう一つの異なった結晶相の間の可逆的な相転移に
伴う光学的特性（例えば反射率、透過率）の変化を利用
し情報を記録するものであるが、記録または消去時には
照射した光がいったん記録層に吸収されて熱に変換され
、その熱によって変態が生じることからいずれもヒート
モード記録の一種である。一般にこのようなヒートモー
ド記録の場合には記録消去の動作時に記録層の温度を上
記記録層の融点またはガラス転移温度以上の高温に昇温
することが必要であり、このため熱による記録層の蒸発
、あるいは基材の変形等が生じやすい。そこで、これを
防止する目的で基材の表面あるいは記録層の両側にある
種の誘電体の層、例えばＳｉＯ□、ＡＩ！２０．等の酸
化物、ＺｎＳ等の硫化物の層を設けることが一般的に行
なわれてきている。誘電体材料の選定基準には化学的熱
的に安定なこと、物理的強度が大きいこと、形成しやす
いこと等色々な要素が有るが、基本的に記録層材料の特
性との関係で選ばれており、例えば記録層に用いる材料
の融点に比較するとそれよりも高い融点のものが用いら
れていた。BACKGROUND ART As one of the recording materials used in the recording layer of a rewritable optical information recording medium, there is a group of materials collectively called phase change materials. Information is recorded by utilizing changes in optical properties (e.g. reflectance, transmittance) that occur due to reversible phase transitions between different crystal phases, but during recording or erasing, the irradiated light once penetrates the recording layer. This is a type of heat mode recording because it is absorbed by and converted into heat, and the heat causes transformation. Generally, in the case of such heat mode recording, it is necessary to raise the temperature of the recording layer to a high temperature higher than the melting point or glass transition temperature of the recording layer during the recording erasing operation. Evaporation or deformation of the base material is likely to occur. Therefore, in order to prevent this, some kind of dielectric layer is added on the surface of the substrate or on both sides of the recording layer, such as SiO□, AI! 20. It has been common practice to provide a layer of oxides such as ZnS and sulfides such as ZnS. There are various criteria for selecting dielectric materials, such as chemical and thermal stability, high physical strength, and ease of formation, but basically dielectric materials are selected based on the characteristics of the recording layer material. For example, materials with a melting point higher than that of the material used for the recording layer were used.
これは記録層を高温まで加熱した際に両側の誘電体層を
も溶かしてしまわないようにということからであった。This was done to prevent the dielectric layers on both sides from melting when the recording layer was heated to a high temperature.
発明が解決しようとする課題
相変化型の光学情報記録媒体における記録消去の繰り返
し寿命を決定する要因を検討し、問題の一つが従来の多
層膜の構成にあることがわかった。Problems to be Solved by the Invention After studying the factors that determine the repeated recording/erasing life of a phase-change optical information recording medium, it was found that one of the problems lies in the structure of the conventional multilayer film.
即ち、例えば記録層がゴミ、埃等の異物を含んでいたよ
うな場合、また記録層の一部にピンホール等の欠陥を含
んでいた場合、記録層と保護層との間に微細な空間が生
じこの部分の熱的な条件が周囲と異なってしまうという
ことである。レーザー光線の照射条件によっては、この
局所的な欠陥を起点とし膜の破壊が起こるという現象が
発見された。That is, for example, if the recording layer contains foreign matter such as dirt or dust, or if part of the recording layer contains defects such as pinholes, minute spaces may be created between the recording layer and the protective layer. This means that the thermal conditions in this area are different from those in the surrounding area. It has been discovered that, depending on the laser beam irradiation conditions, film destruction occurs starting from these local defects.
課題を解決するための手段
本発明は上記記録消去の繰り返しの際に局部的に発生し
拡大する破壊を防止する目的で成されたものであって、
従来例における記録層と誘電体層との間にさらに透明体
からなる層を追加し、その融点あるいはガラス化転移′
温度を記録層を構成する物質の融点もしくはガラス化転
移温度と同等またはそれより低く設定するものである。Means for Solving the Problems The present invention has been made for the purpose of preventing damage that locally occurs and expands when the above-mentioned record erasure is repeated, and includes:
A layer made of a transparent material is further added between the recording layer and the dielectric layer in the conventional example, and its melting point or vitrification transition'
The temperature is set to be equal to or lower than the melting point or vitrification transition temperature of the material constituting the recording layer.
また同時に上記透明体を形成する物質をあらかじめ混合
した記録層を用い記録層の特性を改良しようと言うもの
である。At the same time, it is an attempt to improve the characteristics of the recording layer by using a recording layer premixed with the substance forming the transparent body.
作用
上記透明体層の融点もしくはガラス転移温度を上記記録
層の融点に近く選べば、この透明体層は記録消去時にお
いて必ず溶融あるいは軟化することとなり、ゴミ、傷等
の影響でその周囲の部分に生じる空間を充填し、記録層
の膨張収縮に伴う記録層−誘電体層間の隙間の発生、拡
大を抑制するものである。また記録層中に上記透明体を
含有させることにより記録層の粘度が高まり、たとえゴ
ミ、埃等による空間が形成されたとしても記録層の物質
的移動を抑制し上記破壊の進行を押さえるものである。Function: If the melting point or glass transition temperature of the transparent layer is selected to be close to the melting point of the recording layer, this transparent layer will always melt or soften when erasing records, and the surrounding area will be affected by dust, scratches, etc. This fills the space created between the recording layer and the dielectric layer, thereby suppressing the generation and expansion of a gap between the recording layer and the dielectric layer due to expansion and contraction of the recording layer. In addition, by including the above-mentioned transparent body in the recording layer, the viscosity of the recording layer is increased, and even if a space is formed due to dirt, dust, etc., the physical movement of the recording layer is suppressed and the progress of the above-mentioned destruction is suppressed. be.
実施例 第１図に本発明の記録媒体の基本構成を示す。Example FIG. 1 shows the basic configuration of the recording medium of the present invention.
（図中ａ）は、透明体層を最初から形成しておく場合の
構成例であって基ｖｉ、ｌの上に保護！２．透明体層３
．記録層４．透明体層５．保護体層６゜接着層７．保護
基材８というように積層された構成になっている。（ｂ
）は、記録層中に上記透明体を構成する物質と同様の物
質１０を添加した例を示している。いずれの構成につい
ても第２図に示すように、保護層６の上にさらに光学的
反射層９を追加した構造（ａ）、透明体層と保護層が記
録層の上側か下側のどちらか一方だけにある構造（ロ）
および（Ｃ）、保護基材のない構造（Φ等、樟々な形態
をとることができる。透明体層は初めから形成しておく
場合と、後述するように例えば記録層の相分離を利用し
て後から形成する場合とがある。(a) in the figure is an example of a structure in which a transparent layer is formed from the beginning, and is protected on the groups vi and l. 2. Transparent layer 3
．． Recording layer 4. Transparent layer 5. Protector layer 6゜adhesive layer 7. The protective base material 8 has a laminated structure. (b
) shows an example in which a substance 10 similar to the substance constituting the transparent body is added to the recording layer. In both configurations, as shown in FIG. 2, there is a structure (a) in which an optical reflective layer 9 is further added on top of the protective layer 6, and the transparent layer and the protective layer are either above or below the recording layer. Structure that exists only on one side (b)
and (C), a structure without a protective base material (Φ, etc., can take various forms.The transparent layer may be formed from the beginning, or it may be formed by using phase separation of the recording layer, for example, as described later. In some cases, it may be formed later.
基板、誘電体層、記録層、接着層等の各層を構成する材
質としては、従来光学情報記録媒体に用いられているも
のをそのまま同様に使用することが可能である。たとえ
ば基板としてはＰＭＭＡ。As for the materials constituting each layer such as the substrate, dielectric layer, recording layer, adhesive layer, etc., those conventionally used in optical information recording media can be used as they are. For example, the substrate is PMMA.
ポリカーボネイト塩化ビニール等の樹脂基材の他にガラ
ス板、Ｃｕ、Ａ１等の金属板等を用いることが出来る。In addition to resin base materials such as polycarbonate vinyl chloride, glass plates, metal plates such as Cu, A1, etc. can be used.
誘電体層は５ｉＯ７，Ａｎ２０３等の酸化物、ＺｎＳ等
の硫化物またはこれらの混合物等が用いられる。記録層
としてはアモルファス−結晶の相変態を利用するものと
してＴｅ、Ｓｅをヘースとした例えばＧｅＴｅ、Ｇｅ−
３ｂ−Ｔｅ。For the dielectric layer, oxides such as 5iO7 and An203, sulfides such as ZnS, or mixtures thereof are used. The recording layer is made of amorphous-crystalline phase transformation, such as GeTe, Ge-
3b-Te.
Ｉｎ５ｅｉｌ！１等のカルコゲナイドガラス薄膜、Ｔｅ
−０−Ｇｅ−３ｎ、Ｔｅ−Ｇｅ−３ｎ−Ａｕ等の低酸化
物系の薄膜、結晶−結晶間の相変態を利用するものとし
てＩｎＳｂ、ＡｇＺｎ１ｌ膜等ヒートモードによって繰
返し記録消去を行なう記録薄膜が適用される０本発明を
特徴づけるのは上記透明体物質の存在であるが、その材
質は記録層の材質との関係において以下の特徴を存する
ことが重要である。すなわち記録層の融点と同等（同じ
か高くてもせいぜい１００度程度の差）もしくはそれよ
りもやや低い融点を有していて、記録時には溶融、軟化
することが必要である。あるいはたとえ融点は高くとも
そのガラス転移温度が記録層の融点と同等（同じか高く
てもせいぜい１００度程度の差）もしくはそれよりもや
や低いことが必要である。また記録層とは固溶しない物
質であることも必要である。透明体層が追加されること
によって、例えば記録層の表面にゴミ、埃等があってな
んらかの隙間が空いたとしても上記透明体層がその隙間
を補填し空間が生じることに起因する記録層の破壊、破
壊の進行を低減することができる。また記録層に添加し
た場合には、系の粘度を高め、これによっていわばバイ
ンダーのような働きをし、たとえ記録層と保護層の間に
なんらかの原因で空間が生じたとしても空間の拡大を抑
制する効果を生じるものである。この際記録層中に添加
した物質が記録層を形成する物質と固溶しない性質のも
のであれば記録消去の作業によって相分離が生じ、あた
かもあらかじめ透明体層を形成したのと同様の効果を得
ることもできる。特性としてはこれ以外にも例えば光学
的に透明であること、化学的に安定であって変質しにく
いこと、緻密であること等、上記誘電体層と共通した特
徴を備えていることが必要である。具体的には記録層と
の関係で選ばれるべきものであるが、記録層の融点がテ
ルル、セレン等のカルコゲナイドガラス薄膜を用いるよ
うな場合においては融点はほぼ摂氏４５０度−７００度
の間に入っており、酸化ボロン、または酸化ボロンと酸
化珪素、酸化アルミニウムあるいは酸化鉛との混合物ガ
ラス、例えばパイレックスガラス等のホウ珪酸ガラスが
用いられる。In5eil! 1st grade chalcogenide glass thin film, Te
- Low oxide thin films such as 0-Ge-3n and Te-Ge-3n-Au, recording thin films that repeatedly erase records by heat mode, such as InSb and AgZn1l films that utilize phase transformation between crystals. What characterizes the present invention is the presence of the above-mentioned transparent material, and it is important that the material has the following characteristics in relation to the material of the recording layer. That is, it must have a melting point that is equal to or slightly lower than the melting point of the recording layer (at most, a difference of about 100 degrees at most), and must be melted and softened during recording. Alternatively, even if the melting point is high, it is necessary that the glass transition temperature is equal to or slightly lower than the melting point of the recording layer (at most, the difference is about 100 degrees). It is also necessary that the material is not dissolved in solid form with the recording layer. By adding a transparent layer, even if there is some kind of gap on the surface of the recording layer due to dirt, dust, etc., the transparent layer will compensate for the gap, and the recording layer will not be damaged due to the gap. Destruction and progression of destruction can be reduced. Additionally, when added to the recording layer, it increases the viscosity of the system and acts like a binder, suppressing the expansion of the space even if it is created for some reason between the recording layer and the protective layer. It produces the effect of At this time, if the substance added to the recording layer does not dissolve solidly with the substance forming the recording layer, phase separation will occur during the recording erasing operation, resulting in the same effect as if a transparent layer had been formed in advance. You can also get it. In addition to the above properties, it must also have characteristics common to the dielectric layer mentioned above, such as being optically transparent, being chemically stable and difficult to change in quality, and being dense. be. Specifically, it should be selected in relation to the recording layer, but in cases where a chalcogenide glass thin film of tellurium, selenium, etc. is used, the melting point of the recording layer should be approximately between 450 and 700 degrees Celsius. Boron oxide or a mixture glass of boron oxide and silicon oxide, aluminum oxide, or lead oxide, such as borosilicate glass such as Pyrex glass, is used.
記録媒体の製法としてはまず下の層から上の層へと順次
形成してゆく方法がある。各層は蒸着、スパッタリング
、ＣＶＤ等の方法で形成される。One method for manufacturing a recording medium is to form layers sequentially from the bottom layer to the top layer. Each layer is formed by a method such as vapor deposition, sputtering, or CVD.
透明体を形成するためのもう一つの製法としては、透明
体層を形成するための物質だけは記録層中にあらかじめ
含ませておいておくというのがある。Another manufacturing method for forming a transparent body is to pre-include only the substance for forming the transparent body layer in the recording layer.
この場合、透明体は記録媒体が完成後、レーザー照射す
ることで記録層から相分離して形成されるが、この方法
によって形成する透明体層の組成は記録層中に含ませた
物質と同一の組成である場合と、多少異なる場合がある
０例えば酸化物の透明体層を形成しようと言う場合単体
元素として添加し、記録層中の酸素を取り込ませること
によつて生じる酸化物を相分離させるようなことも出来
るし、最初から酸化物を記録層の中に含ませてしまうこ
とも出来る。この場合大切なことは透明体層を形成する
物質の特性として、記録層を形成する物質とは固溶しな
いことであって、固溶してしまうと透明体としての働き
をなさなくなってしまう。In this case, the transparent body is formed by phase separation from the recording layer by laser irradiation after the recording medium is completed, but the composition of the transparent body layer formed by this method is the same as the substance contained in the recording layer. For example, when forming a transparent layer of oxide, it is added as a single element, and the oxide produced by incorporating oxygen in the recording layer is phase-separated. It is also possible to make the recording layer contain the oxide from the beginning. In this case, what is important is that the material forming the transparent layer does not form a solid solution with the material forming the recording layer, and if it does, it will no longer function as a transparent material.
以下、具体例をもって本発明の詳細な説明する。Hereinafter, the present invention will be explained in detail using specific examples.
実施例１
厚さ１．２閤、直径１２０■のポリカーボネイト製ディ
スク基材上に厚さ１１００ｎのＺｎＳ層（融点は摂氏１
７００度）、厚さ５層ｍの８２０８層（融点は摂氏４５
０度）、６００ｎｍのＧ ｅ ２ Ｓ ｂ ２ Ｔ ｅ
５層（融点は摂氏６２５度）、厚さ５層ｍの８２０３
層、厚さ２０ｎｍのＡｕ層を順次電子ビーム蒸着法によ
って形成しその上に基材と同しポリカーボネイト板を接
着層を介して張り合わせて光ディスクを試作した。記録
層はＧｅ、Ｓｂ、Ｔｅの３つのソースを用意し、それぞ
れのソースからの蒸発量を独立に制御することで基板上
に希望する組成の膜を形成した。また本発明の透明体層
の効果を確認する意味から８２０８層のないディスクも
試作して比較見当を行なった。Example 1 A ZnS layer with a thickness of 1100 nm (melting point of
700 degrees), 8208 layers with a thickness of 5 layers (melting point is 45 degrees Celsius)
0 degrees), 600 nm G e 2 S b 2 T e
8203 with 5 layers (melting point is 625 degrees Celsius), 5 layers thick
A 20 nm thick Au layer was sequentially formed by electron beam evaporation, and a polycarbonate plate, which was the same as the base material, was laminated thereon via an adhesive layer to fabricate a prototype optical disk. Three sources of Ge, Sb, and Te were prepared for the recording layer, and a film with a desired composition was formed on the substrate by independently controlling the amount of evaporation from each source. Furthermore, in order to confirm the effect of the transparent layer of the present invention, a trial disc without the 8208 layer was also produced for comparison purposes.
上記各ディスクを１８００回転／回転速度で回転させ第
三図に示すように記録（アモルファス化）パワーレベル
と消去（結晶化）パワーレベルの間で変調したレーザー
光を照射して記録消去の繰返し寿命を調べた。Each of the above disks is rotated at 1800 rotations/rotation speed and irradiated with a laser beam modulated between the recording (amorphization) power level and the erasing (crystallization) power level as shown in Figure 3, and the repetition life of recording and erasure is achieved. I looked into it.
第４図に繰返し回数とＣＮ比の関係を調べた結果を示す
、Ｂ２０．層のないディスクについては５万回付近から
徐々にＣＮ比の減少が観察されたが、Ｂ２０．層を設け
たディスクについては１０万回付近まで顕著な変化は観
察されなかった。光学顕微鏡によって８２０．層のない
ディスクを観察したところ記録消去を繰返したトラック
の何ケ所かにゴミ等の異物が有り、そこを起点として記
録膜の破壊が見出された。一方８２０８層を設けたディ
スクについても同様の異物は観察されたが上記のような
破壊は観察されなかった。Figure 4 shows the results of investigating the relationship between the number of repetitions and the CN ratio, B20. For the disc without a layer, a gradual decrease in the CN ratio was observed from around 50,000 cycles, but for the B20. Regarding the layered disc, no significant change was observed until around 100,000 cycles. 820. by optical microscope. When the disk without a layer was observed, it was found that there were foreign substances such as dust in several places on the track where recording and erasure had been repeated, and that the recording film was destroyed starting from there. On the other hand, similar foreign matter was observed in the disk provided with the 8208 layer, but no breakage as described above was observed.
実施例２
Ｇｅ、Ｓｂ、Ｔｅに加えＢ（ボロン）およびＢ、Ｏ，を
蒸着するためのソースを用意した。記録層の組成が（Ｇ
ｅｏ、ｔｚｓ ｂｅ、ｇｚＴ ｅｏ、５ｈ）ｓ。Ｂ１
、および（Ｃｒ ｅ＠、！ｌｓ ｂｏ、ｚｔＴ ｅｏ、
ｓ＆）＊ｏ（Ｂ２０３ ）１となるよに各ソースからの
蒸着量を制御し、上記透明体のない二枚の光ディスクを
試作した。これらの記録媒体にレーザー光線を照射し記
録膜をいったん溶融させた後、記録層の断面をＳＥＭで
観察したところ記録層と保護層の間に透明な層が形成さ
れていることが分かった。またこの層はボロンの酸化物
層であることがＥＳＣＡによって確かめられた。実施例
１と同様の繰返しテストをしたところいずれの場合にも
実施例１における酸化ボロン層を設けた場合と同様の効
果が確かめられた。Example 2 A source for vapor depositing B (boron) and B, O, in addition to Ge, Sb, and Te was prepared. The composition of the recording layer is (G
eo, tzs be, gzT eo, 5h)s. B1
, and (Cr e@, !ls bo, ztT eo,
The amount of vapor deposition from each source was controlled so that s&)*o(B203)1 was obtained, and two optical discs without the above-mentioned transparent body were experimentally manufactured. After irradiating these recording media with a laser beam to once melt the recording film, the cross section of the recording layer was observed with an SEM, and it was found that a transparent layer was formed between the recording layer and the protective layer. Furthermore, it was confirmed by ESCA that this layer was a boron oxide layer. When the same repeated tests as in Example 1 were carried out, the same effects as in Example 1 when the boron oxide layer was provided were confirmed in all cases.
発明の効果
本発明の透明体層を設けた書き換え可能な相変化型の光
記録媒体では、たとえゴミ、塵等の異物が記録層にまぎ
れこんで保護層との間に隙間を作っても上記透明体層が
その隙間を埋めることによって、密着性を保つことがで
きた。すなわち、書き換えに際してレーザー光線を繰返
し照射した時にも、異物周辺の隙間から記録層の破壊が
進行するといった現象は生じず、蒸発を防止する働きを
示し、安定に書き換えの行なえる回数を向上させられる
ことが示された。Effects of the Invention In the rewritable phase change optical recording medium provided with the transparent layer of the present invention, even if foreign matter such as dirt or dust gets into the recording layer and creates a gap between it and the protective layer, the transparent Adhesion was maintained by the body layer filling the gap. In other words, even when repeatedly irradiated with a laser beam during rewriting, the phenomenon that destruction of the recording layer progresses through the gaps around foreign objects does not occur, and the recording layer works to prevent evaporation, increasing the number of times that rewriting can be performed stably. It has been shown.
また上記透明体を記録層に添加した記録媒体においても
同様に書き換え回数の向上が確認された。In addition, a similar improvement in the number of rewrites was confirmed in a recording medium in which the above-mentioned transparent material was added to the recording layer.
第１図は本発明の記録媒体の代表的な構成を示す断面図
、第２図は同じく記録媒体の様々な構成例を示す断面図
、第３図は本発明の記録媒体に単一のレーザーでオーバ
ーライドを行なう際の照射光の変調方法を示すグラフ図
、第４図は本発明にオーバーライドを行なった際のＣＮ
比と繰返し回数の関係を従来例と比較してしめずグラフ
である。
１・・・・・・基板、２，６．８・・・・・・保護層、
３，５・・・・・・透明体層、４・・・・・・記録層、
７・・・・・・接着層代理人の氏名 弁理士 粟野重孝
はか１名図
Ｍ２図
（（Ｌ）
（６しン
（ｂ）
（Ｃ）
（ｃｔ）
書き筏え８数
手続補正書動式）
％式％
１事件の表示
昭和６３年特許願第２４８１１９号
発明の名称
光学情報記録媒体
補正をする者
事件との関係 特 許 出 願
人任 所 大阪府門真市大字門真１００６番地名
称 （５８２）松下電器産業株式会社代表者
谷 井 昭 雄FIG. 1 is a cross-sectional view showing a typical configuration of the recording medium of the present invention, FIG. 2 is a cross-sectional view showing various configuration examples of the recording medium, and FIG. A graph showing the method of modulating the irradiation light when overriding in the present invention, FIG.
This is a graph showing the relationship between the ratio and the number of repetitions in comparison with a conventional example. 1...Substrate, 2,6.8...Protective layer,
3, 5... Transparent layer, 4... Recording layer,
7...Adhesive layer agent's name Patent attorney Shigetaka Awano Figure M2 ((L) (6 lines (b) (C) (ct) Written raft 8 number procedure amendment letter Formula) % Formula % 1 Indication of the case Patent Application No. 248119 of 1988 Name of the invention Person who corrects optical information recording media Relationship to the case Patent application Person 1006 Kadoma, Kadoma City, Osaka Prefecture Name ( 582) Representative of Matsushita Electric Industrial Co., Ltd.
Akio Tanii
Claims (10)
ってその光学的特性を局所的に変化する記録媒薄膜と、
上記基材または記録薄膜を保護するために上記記録薄膜
の両側または片側に備えられた保護膜と、さらに上記記
録層と保護層の間に設けられ記録または消去時において
溶融あるいは軟化する透明体層とを備えた光学情報記録
媒体。(1) at least a base material, a recording medium thin film formed on the base material and whose optical properties locally change by light irradiation;
A protective film provided on both sides or one side of the recording thin film to protect the base material or the recording thin film, and a transparent layer that is further provided between the recording layer and the protective layer and melts or softens during recording or erasing. An optical information recording medium comprising:
ってその光学的特性を局所的に変化する記録薄膜と、上
記基材または記録薄膜を保護するために上記記録薄膜の
両側または片側に備えられた保護膜と、さらに上記記録
層と保護層の間に設けられ記録または消去時において溶
融あるいは軟化し上記記録層と保護層の間に隙間の発生
を抑制するための透明体層を備えた光学情報記録媒体。(2) At least a base material, a recording thin film formed on the base material and having its optical characteristics locally changed by light irradiation, and a provision on both sides or one side of the recording thin film to protect the base material or the recording thin film. A transparent layer is provided between the recording layer and the protective layer and melts or softens during recording or erasing to suppress the generation of gaps between the recording layer and the protective layer. Optical information recording medium.
性を局所的に変化する記録薄膜と、上記基材または記録
膜を保護するために上記記録薄膜の両側または片側に備
えられた保護膜と、さらに記録層と保護層の間に設けら
れた透明体層から成り、上記透明体層を構成する物質の
融点を上記記録薄膜を形成する物質の融点に比較して、
同等、もしくは低く選んだことを特徴とする請求項（１
）記載の光学情報記録媒体。(3) at least a base material, a recording thin film whose optical properties are locally changed by light irradiation, and a protective film provided on both sides or one side of the recording thin film to protect the base material or the recording film; , further comprising a transparent layer provided between the recording layer and the protective layer, comparing the melting point of the substance constituting the transparent layer with the melting point of the substance forming the recording thin film,
Claims characterized by the same or lower selection (1)
) optical information recording medium.
性を局所的に変化する記録薄膜と、上記基材または記録
膜を保護するために上記記録薄膜の両側または片側に備
えられた保護層と、さらに記録層と保護層の間に設けら
れた透明体層からなる光学的情報記録媒体において、上
記保護層を形成する物質のガラス転移温度を上記記録薄
膜を形成する物質の融点と同じ、もしくはそれよりも低
くなるように選んで形成したことを特徴とする請求項（
１）記載の光学情報記録媒体。(4) At least a base material, a recording thin film whose optical properties are locally changed by light irradiation, and a protective layer provided on both sides or one side of the recording thin film to protect the base material or the recording film. Further, in an optical information recording medium comprising a transparent layer provided between a recording layer and a protective layer, the glass transition temperature of the substance forming the protective layer is the same as the melting point of the substance forming the recording thin film, or A claim characterized in that it is selected and formed to be lower than
1) The optical information recording medium described above.
い物質から成ることを特徴とする請求項（１）記載の光
学情報記録媒体。(5) The optical information recording medium according to claim (1), wherein the transparent body is made of a substance that does not form a solid solution with the substance of the recording layer.
融点ガラスからなることを特徴とする請求項（１）記載
の光学情報記録媒体。(6) The optical information recording medium according to claim 1, wherein the transparent body is made of low melting point glass such as boron oxide or borosilicate glass.
ってその光学的特性を局所的に変化する記録薄膜と、上
記基材または記録薄膜を保護するために上記記録薄膜の
両側または片側に備えられた保護膜とからなり、上記記
録層が相変化によって光学的変化を生ずる成分と記録消
去または初期化のいずれかの作業によって上記成分より
も比較的容易に溶融または軟化する透明な成分とから形
成されることを特徴とする光学情報記録媒体。(7) At least a base material, a recording thin film formed on the base material and having its optical properties locally changed by light irradiation, and a provision on both sides or one side of the recording thin film to protect the base material or the recording thin film. The recording layer is composed of a component that causes an optical change due to a phase change, and a transparent component that melts or softens relatively more easily than the above component by either recording erasing or initialization. An optical information recording medium characterized by being formed.
ってその光学的特性を局所的に変化する記録薄膜と、上
記基材または記録薄膜を保護するために上記記録薄膜の
両側または片側に備えられた保護膜とからなり、上記記
録層が記録、消去または初期化のいずれかの作業によっ
て一部の成分を相分離し、上記記録層と上記保護層の間
に透明な層を形成し、その層が記録または消去時におい
て溶融あるいは軟化し上記記録層と保護層の間で隙間が
発生することを抑制することを特徴とする光学情報記録
媒体。(8) At least a base material, a recording thin film formed on the base material and having its optical characteristics locally changed by light irradiation, and a provision on both sides or one side of the recording thin film to protect the base material or the recording thin film. A transparent layer is formed between the recording layer and the protective layer by phase-separating some components of the recording layer during recording, erasing, or initialization, and forming a transparent layer between the recording layer and the protective layer. An optical information recording medium characterized in that the layer melts or softens during recording or erasing, thereby suppressing the generation of a gap between the recording layer and the protective layer.
ってその光学的特性を局所的に変化する記録薄膜と、上
記基材または記録薄膜を保護するために上記記録薄膜の
両側または片側に備えられた保護膜とからなり、上記記
録層が相変化を起こす主成分と酸化ボロン、ホウ珪酸ガ
ラス等の低融点ガラスからなることを特徴とする請求項
（７）記載の光学情報記録媒体。(9) At least a base material, a recording thin film formed on the base material and having its optical characteristics locally changed by light irradiation, and a provision on both sides or one side of the recording thin film to protect the base material or the recording thin film. 8. The optical information recording medium according to claim 7, wherein the recording layer is made of a main component that causes a phase change and a low melting point glass such as boron oxide or borosilicate glass.
スとするカルコゲン化物であることを特徴とする請求項
（９）記載の光学情報記録媒体。(10) The optical information recording medium according to claim 9, wherein the main component that causes a phase change is a chalcogenide based on Te or Se.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63248119A JP2537995B2 (en) | 1988-09-30 | 1988-09-30 | Optical information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63248119A JP2537995B2 (en) | 1988-09-30 | 1988-09-30 | Optical information recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02216630A true JPH02216630A (en) | 1990-08-29 |
| JP2537995B2 JP2537995B2 (en) | 1996-09-25 |
Family
ID=17173513
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63248119A Expired - Fee Related JP2537995B2 (en) | 1988-09-30 | 1988-09-30 | Optical information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2537995B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6047246A (en) * | 1983-08-26 | 1985-03-14 | Hitachi Ltd | Optical recording medium |
| JPS6199950A (en) * | 1984-10-19 | 1986-05-19 | Hitachi Ltd | Optical recording member |
| JPS61184743A (en) * | 1985-02-13 | 1986-08-18 | Matsushita Electric Ind Co Ltd | Optical recording medium |
-
1988
- 1988-09-30 JP JP63248119A patent/JP2537995B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6047246A (en) * | 1983-08-26 | 1985-03-14 | Hitachi Ltd | Optical recording medium |
| JPS6199950A (en) * | 1984-10-19 | 1986-05-19 | Hitachi Ltd | Optical recording member |
| JPS61184743A (en) * | 1985-02-13 | 1986-08-18 | Matsushita Electric Ind Co Ltd | Optical recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2537995B2 (en) | 1996-09-25 |
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