JPH0340240A - Optical information recording medium - Google Patents
Optical information recording mediumInfo
- Publication number
- JPH0340240A JPH0340240A JP1174703A JP17470389A JPH0340240A JP H0340240 A JPH0340240 A JP H0340240A JP 1174703 A JP1174703 A JP 1174703A JP 17470389 A JP17470389 A JP 17470389A JP H0340240 A JPH0340240 A JP H0340240A
- Authority
- JP
- Japan
- Prior art keywords
- recording layer
- layer
- solid state
- recording
- light
- 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
- 230000003287 optical effect Effects 0.000 title claims description 26
- 239000010410 layer Substances 0.000 claims abstract description 94
- 239000011241 protective layer Substances 0.000 claims abstract description 25
- 239000007787 solid Substances 0.000 claims abstract description 16
- 238000002844 melting Methods 0.000 claims abstract description 10
- 230000008018 melting Effects 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000010521 absorption reaction Methods 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims abstract 4
- 239000000463 material Substances 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052732 germanium Inorganic materials 0.000 claims description 4
- 230000031700 light absorption Effects 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 229910052718 tin Inorganic materials 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 229910052785 arsenic Inorganic materials 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229910052802 copper Inorganic materials 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 229910052709 silver Inorganic materials 0.000 claims description 2
- 229910052715 tantalum Inorganic materials 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims 1
- 229910052804 chromium Inorganic materials 0.000 claims 1
- 229910052738 indium Inorganic materials 0.000 claims 1
- 150000004767 nitrides Chemical class 0.000 claims 1
- 229910052757 nitrogen Inorganic materials 0.000 claims 1
- 229910052697 platinum Inorganic materials 0.000 claims 1
- 229910052721 tungsten Inorganic materials 0.000 claims 1
- 229910052727 yttrium Inorganic materials 0.000 claims 1
- 239000010408 film Substances 0.000 description 13
- 238000000034 method Methods 0.000 description 9
- 239000000758 substrate Substances 0.000 description 6
- 239000012071 phase Substances 0.000 description 5
- 239000007790 solid phase Substances 0.000 description 5
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000015654 memory Effects 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 230000005374 Kerr effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000010365 information processing Effects 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920003217 poly(methylsilsesquioxane) Polymers 0.000 description 1
- 229920005668 polycarbonate resin Polymers 0.000 description 1
- 239000004431 polycarbonate resin Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000012780 transparent material Substances 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、レーザ光等の光照射により記録層を昇温させ
記録層に相変化を生しさせて情報を記録消去する大容量
メモリなる光情報記録媒体に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to optical information processing, which is a large-capacity memory that records and erases information by heating a recording layer by irradiating it with light such as a laser beam and causing a phase change in the recording layer. Regarding recording media.
従来の技術
従来、実用化が容易であり大容量メモリで情報の消去が
可能な光情報記録媒体としては光磁気型と相変化型のも
のが知られている。両者ともシステムの高速化および小
型化のために１つの光で一度に記録消去をする方式、す
なわち、１ビ一ムオーバーライド方式の開発が行われて
いる。光磁気型の場合は磁界の向きを高速で変える磁界
変調方式と記録層を磁気特性の温度依存性が異なる２層
構造として照射光の強度を変える光変調方式がある。し
かし、磁界変調方式では磁界をかけるへンドを光情報記
録媒体に非常に接近させて固定するため光情報記録媒体
にヘッドが接触する恐れがあり非破壊性に課題がある。2. Description of the Related Art Conventionally, magneto-optical and phase-change types have been known as optical information recording media that are easy to put into practical use and allow erasing of information in large-capacity memories. In order to speed up the system and make it more compact, a method of recording and erasing information at once using one beam, that is, a one-beam override method is being developed for both systems. In the case of the magneto-optical type, there are two methods: a magnetic field modulation method in which the direction of the magnetic field is changed at high speed, and an optical modulation method in which the recording layer has a two-layer structure with different temperature dependencies of magnetic properties and the intensity of the irradiated light is changed. However, in the magnetic field modulation method, since the head that applies the magnetic field is fixed very close to the optical information recording medium, there is a risk that the head may come into contact with the optical information recording medium, and there is a problem in non-destructiveness.
また、光学調方式では磁界をかけるへンドを磁界変調方
式のように極度に光情報記録媒体に接近させる必要はな
いが上述したように光情報記録媒体の記録層を２層構造
とするため構造が複雑になる。さらに、光磁気型ではカ
ー効果により記録層の磁界の向きで入射光に対する反射
光の偏向角が変化することを利用しているがその変化量
は１ ｄｅｇ程度と小さいため光学系に精度が要求され
る。また、記録層材料は酸化されやすく酸化すると保磁
力が低下するので耐候性が悪かった。一方、相変化型の
場合は、相異なる２つの固相状態によって反射光量が変
化することを利用しており、この固相状態間の変化は照
射光の強度変調のみで行うため光磁気型のような外部磁
界をかけるヘッドが不要でドライブの構成が簡単である
。また、記録層は１層でよく特別な構造にする必要がな
い。さらに、酸化に対しても強いので耐候性もよい。In addition, in the optical modulation method, unlike in the magnetic field modulation method, it is not necessary to bring the end that applies the magnetic field extremely close to the optical information recording medium, but as mentioned above, the recording layer of the optical information recording medium has a two-layer structure. becomes complicated. Furthermore, the magneto-optical type uses the fact that the deflection angle of the reflected light relative to the incident light changes depending on the direction of the magnetic field in the recording layer due to the Kerr effect, but the amount of change is small at about 1 degree, so precision is required in the optical system. be done. In addition, the recording layer material is easily oxidized and when oxidized, the coercive force decreases, resulting in poor weather resistance. On the other hand, the phase change type utilizes the fact that the amount of reflected light changes depending on two different solid phase states, and the change between these solid phase states is achieved only by intensity modulation of the irradiated light, so the magneto-optical type There is no need for a head that applies such an external magnetic field, and the drive configuration is simple. Further, the recording layer may be one layer and there is no need for a special structure. Furthermore, it is resistant to oxidation and has good weather resistance.
発明が解決しようとする課題
上述したように相変化型は光磁気型に比べて多くのよい
点がある。しかし、相変化型の光情報記録媒体の場合、
記録消去の繰り返し回数が増すにつれて記録層の膜厚が
不均一になり、記録消去の感度が局所的に異なるので繰
返し回数が制？１１されるという課題があった。Problems to be Solved by the Invention As mentioned above, the phase change type has many advantages over the magneto-optical type. However, in the case of phase change type optical information recording media,
As the number of repetitions of recording and erasing increases, the thickness of the recording layer becomes uneven, and the sensitivity of recording and erasing varies locally, so the number of repetitions becomes limited. There was the issue of being hit by 11.
本発明はかかる課題を鑑みて、記録消去の繰り返し回数
を飛躍的に伸ばす相変化型の光情報記録媒体を提供する
ことを目的とする。In view of the above problems, the present invention aims to provide a phase-change optical information recording medium that dramatically increases the number of times recording and erasing can be repeated.
課題を解決するための手段
上記課題を解決するために本発明では、光照射によりエ
ネルギーを吸収し昇温し熔融し急令して第１の固相状態
になる＋ｈ質と、第１の固相状態を昇温し２除冷して第
２の固相状態になる４４に質と、第１の固相状態と第２
の固相状態とで照射光に対する反射光量が異なる性質と
を有する記録層と、記録層の上および下に形成された記
録層より高融点な第１および第２の保護層と、第２の保
護層の上に形成され記録層を透過した光を反射させて記
録層に再入射させる反射層とを有する光情報記録媒体に
おいて、記録層の膜厚によらず記録層の到達温度を略同
−にするものである。Means for Solving the Problems In order to solve the above problems, in the present invention, a +H material which absorbs energy by irradiation with light, heats up, melts and rapidly enters a first solid phase state; The temperature of the phase state is increased and the temperature is gradually cooled to reach the second solid state.
a recording layer having a property that the amount of reflected light with respect to irradiation light differs depending on the solid phase state of the recording layer; first and second protective layers having a higher melting point than the recording layer formed above and below the recording layer; In an optical information recording medium having a reflective layer formed on a protective layer to reflect light that has passed through the recording layer and make it re-enter the recording layer, the temperature reached by the recording layer is approximately the same regardless of the thickness of the recording layer. −.
作用
本発明は記録層の膜厚が不均一になっても記録層の到達
温度が略同−になるので局所的に記録消去の感度が異な
ることはない。また、記録層はどこでも同様の温度履歴
を示すので記録層の膜厚は均一化される。その結果、記
録消去の繰返し回数を飛躍的に伸ばすことができる。In the present invention, even if the thickness of the recording layer becomes non-uniform, the temperature reached by the recording layer remains approximately the same, so there is no difference in the sensitivity of recording and erasing locally. Furthermore, since the recording layer exhibits the same temperature history everywhere, the thickness of the recording layer can be made uniform. As a result, the number of times recording and erasing can be repeated can be dramatically increased.
実施例
以下、本発明の一実施例について回向を参照しながら具
体的に説明する。EXAMPLE Hereinafter, an example of the present invention will be specifically described with reference to the following.
まず、本発明の光情報記録媒体の構成の例を第１図に示
す。第１図において、基板１は透明な材料、例えば、ガ
ラスやポリカーボネート樹脂等の材料で作られている。First, an example of the structure of the optical information recording medium of the present invention is shown in FIG. In FIG. 1, a substrate 1 is made of a transparent material, such as glass or polycarbonate resin.
基板ｉ上には真空薄膜形成方法、例えば、スパッタ法に
より第１の保護層２、記録層３、第２の保護層４、反射
層５と順次積層し接着剤６を介して保護板７と貼り合わ
せている。On the substrate i, a first protective layer 2, a recording layer 3, a second protective layer 4, and a reflective layer 5 are sequentially laminated by a vacuum thin film forming method, for example, a sputtering method, and a protective plate 7 is formed via an adhesive 6. It is pasted together.
保護板７は基板１と同じ材料でもよいし光を透過しない
金属等でもよい。第１図の場合、光は基板１の方から入
射する。The protective plate 7 may be made of the same material as the substrate 1, or may be made of a metal that does not transmit light. In the case of FIG. 1, light enters from the substrate 1.
ここで、第１の保護層２および第２の保護層４は基板１
や接着剤６や保護板７が変形するのを防止する役割をす
る。したがって記録層３は光の照射によって一旦溶融す
るので第１の保護層２および第２の保護層４の融点は記
録層３の融点より高い必要がある。Here, the first protective layer 2 and the second protective layer 4 are formed on the substrate 1.
It also serves to prevent the adhesive 6 and protection plate 7 from being deformed. Therefore, since the recording layer 3 is once melted by light irradiation, the melting points of the first protective layer 2 and the second protective layer 4 need to be higher than the melting point of the recording layer 3.
また、第１の保護層２、第２の保ＫＷＮ４および反射層
５は光の干渉によって記録情報信号となる記録層３の相
異なる固相状態間での反射光量差を大きくする働きをす
る。Further, the first protective layer 2, the second protective KWN 4, and the reflective layer 5 serve to increase the difference in the amount of reflected light between different solid phase states of the recording layer 3, which becomes a recorded information signal by light interference.
ここでは、光情報記録媒体の構成の例として片面密着型
を示したが、両面構成でもいいし、サンドインチ型構成
でもよい。Here, a single-sided contact type is shown as an example of the structure of the optical information recording medium, but a double-sided structure or a sandwich-type structure may also be used.
記録層３の材料としてはＴｅ、Ｓｂ、ＩｎＳｅ、Ｂｉ、
Ｓｎ、Ｚｎ、Ｇｅ、Ｓｉ、Ａｓ、Ｐのうちから選択され
る少なくとも２つの元素からなる材料である。Materials for the recording layer 3 include Te, Sb, InSe, Bi,
The material is made of at least two elements selected from Sn, Zn, Ge, Si, As, and P.
第１の保護層２および第２の保護層４の材料としては、
Ｓｉ、Ａｌ、Ｔａ、Ｔｉ Ｚｎ、ＳｂＹ、Ｇｅ、Ｚｒ
、Ｓｎ、Ｎｂ、Ｖ、Ｍｇのうちから選択される元素の酸
化物または窒化物または硫化物もしくはこれら化合物の
混合物からなる材料である。ここで、第１の保護層２と
第２の保護層４との材料は異なっていてもよい。The materials for the first protective layer 2 and the second protective layer 4 include:
Si, Al, Ta, Ti Zn, SbY, Ge, Zr
, Sn, Nb, V, Mg, or a mixture of these compounds. Here, the first protective layer 2 and the second protective layer 4 may be made of different materials.
反射層５の材料はＡｌ、Ｃｕ、Ａｕ、Ａｇ、ＣｒＮｉ、
ＰＬ、Ｗのうちから選択される少なくとも１つの元素か
らなる材料である。The material of the reflective layer 5 is Al, Cu, Au, Ag, CrNi,
The material is made of at least one element selected from PL and W.
上記の構造を有する光情報記録媒体において本発明を以
下に説明する。The present invention will be explained below using an optical information recording medium having the above structure.
本発明の第１の実施例は、光照射による記録層の到達温
度を、記録層の膜厚が不均一でも略同−にするものであ
る。In the first embodiment of the present invention, the temperature reached by the recording layer by light irradiation is made to be approximately the same even if the thickness of the recording layer is non-uniform.
記録のために記録層３に光が照射されると光エネルギー
が熱に変わり、記録層３が溶融する。すると、記録層３
の上下を覆っている第１の保！Ｉ層２および第２の保護
Ｎ４は、記録層３が熱源になってバイメタル効果によっ
て記録層３側を凸とする変形を生しる。この際、第１の
保護層２および第２の保護層４は記録トランク方向の温
度分布が非対称になるので、記録層３の材料は一方向に
多く押し出される。そして、冷却される際に元どおりに
戻らず局所的に膜厚の不均一が生しる。しかし、本発明
では膜厚が変化しても到達温度が略同−なので記録消去
の感度が初期と変化しない。When the recording layer 3 is irradiated with light for recording, the light energy is converted into heat and the recording layer 3 is melted. Then, recording layer 3
The first protection that covers the top and bottom of! The I layer 2 and the second protection N4 are deformed so that the recording layer 3 side becomes convex due to the bimetallic effect when the recording layer 3 becomes a heat source. At this time, since the temperature distribution of the first protective layer 2 and the second protective layer 4 in the direction of the recording trunk becomes asymmetrical, a large amount of the material of the recording layer 3 is extruded in one direction. Then, when the film is cooled, it does not return to its original state, resulting in localized non-uniform film thickness. However, in the present invention, even if the film thickness changes, the temperature reached is approximately the same, so the recording/erasing sensitivity does not change from the initial level.
また、記録層３の膜厚が厚い所は熱容量が大きく、膜厚
が薄い所は熱容量が小さい。そこで、同一のエネルギー
が記録層３に供給される場合には膜厚が厚い所では到達
温度が低くなり、反対に膜厚が薄い所では到達温度が高
くなる。したがって、記録光が入射した際の記録層３の
記録トラック方向における温度分布の非対称性が大きく
なり、記録層３の膜厚の不均一が一層助長される。しか
し、本発明では記録層３の膜厚が不均一になっても記録
層３の到達温度が略同−であるのでこの記録層３の不均
一化は抑制される。Further, the heat capacity is large where the recording layer 3 is thick, and the heat capacity is small where the recording layer 3 is thin. Therefore, when the same energy is supplied to the recording layer 3, the reached temperature will be lower where the film thickness is thicker, and on the contrary, the reached temperature will be higher where the film thickness is thinner. Therefore, the asymmetry of the temperature distribution in the recording track direction of the recording layer 3 when the recording light is incident becomes large, and the non-uniformity of the film thickness of the recording layer 3 is further promoted. However, in the present invention, even if the thickness of the recording layer 3 becomes non-uniform, the temperature reached by the recording layer 3 remains approximately the same, so that non-uniformity of the recording layer 3 is suppressed.
第２図に記録消去の繰り返し数ど記録層３のシミニレ−
ジョンで求めた膜厚の厚い所と薄い所とでの到達温度差
の関係を示す、繰り返し回数は任意単位である。到達温
度差が±２０にの時、繰り返し回数は１０万回でも、Ｂ
Ｅ Ｒ（ＢｉＬ Ｅｒｒｏｒ Ｒａｔｅ）は１０５台
で良好な結果が得られた。Figure 2 shows the number of repetitions of recording and erasing, as well as the markings of the recording layer 3.
The number of repetitions, which indicates the relationship between the difference in temperature achieved between thick and thin film thickness areas determined by John, is an arbitrary unit. When the temperature difference reached is ±20, even if the number of repetitions is 100,000, B
Good results were obtained for ER (BiL Error Rate) at 105 units.
次に本発明の第２の実施例を示す。Next, a second embodiment of the present invention will be described.
本発明は記録層３での光の吸収率を記録層３の膜厚の不
均一によらず略同−にするか、膜厚が厚いほど大きくす
るものである。この結果、光情報記録媒体に光が照射さ
れると記録層３は記録マーク部において膜厚によらず到
達ｌ温度が略同−になるので、記録層３の膜厚の不均一
は抑制される。In the present invention, the absorption rate of light in the recording layer 3 is made substantially the same regardless of the non-uniformity of the film thickness of the recording layer 3, or is made larger as the film thickness becomes thicker. As a result, when the optical information recording medium is irradiated with light, the temperature reached by the recording layer 3 at the recording mark portion is approximately the same regardless of the film thickness, so non-uniformity in the film thickness of the recording layer 3 is suppressed. Ru.
第３図に記録消去の繰り返し回数と記録層３の膜厚増加
に対する光吸収率の変化率との関係を示す。ここで操り
返し回数は任意単位である。実験の結果、光情報記録媒
体に入射する光の強度を１、 Ｏ０％とすると記録層３
の膜厚増力■に対して光吸収率の変化率が一３％／ ｎ
ｒｎ以ｈｌＯ％／ ｎ ｍ以下の時にＢＥＲは繰り返
し回数が１０万でも１０”台であった。FIG. 3 shows the relationship between the number of repetitions of recording and erasing and the rate of change in light absorption rate with respect to increase in the film thickness of the recording layer 3. Here, the number of repetitions is an arbitrary unit. As a result of the experiment, when the intensity of light incident on the optical information recording medium is 1.0%, the recording layer 3
The rate of change in light absorption rate is 13%/n for the film thickness increase ■
When rn was less than hlO%/nm, the BER was in the 10'' range even if the number of repetitions was 100,000.
発明の効果
本発明により記録層の膜厚が不均一になっても記録層に
光が照射された場合の到達温度に変動がないため記録層
材料の移動は抑制されるので記録消去の繰り返し回数が
飛躍的に伸びる。Effects of the Invention According to the present invention, even if the thickness of the recording layer becomes uneven, there is no change in the temperature reached when the recording layer is irradiated with light, so the movement of the recording layer material is suppressed, which reduces the number of repetitions of recording and erasing. is growing dramatically.
第１図は本発明にかかる光情報記録媒体の構成を示す断
面図、第２図は本発明の第１の実施例における記録消去
の繰り返し回数と記録層の膜厚の厚い所と薄い所との到
達温度差との関係図、第３図は本発明の第２の実施例に
おける記録消去の繰り返し回数と記録膜の膜厚増加に伴
う光吸収率の変化率との関係図である。
Ｉ・・・・・・基板、２・・・・・・第１の保護層、３
・・・・・・記録層、４・・・・・・第２の保護層、５
・・・・・・反射層、６・・・・・・接着剤、７・・・
・・・保護板。FIG. 1 is a cross-sectional view showing the structure of an optical information recording medium according to the present invention, and FIG. 2 shows the number of repetitions of recording and erasing and thick and thin areas of the recording layer in the first embodiment of the invention. FIG. 3 is a diagram showing the relationship between the number of repetitions of recording and erasing and the rate of change in light absorption rate as the thickness of the recording film increases in the second embodiment of the present invention. I...Substrate, 2...First protective layer, 3
...Recording layer, 4...Second protective layer, 5
...Reflection layer, 6...Adhesive, 7...
...Protection board.
Claims (5)
令して第１の固相状態になる性質と、第１の固相状態を
昇温し除冷して第２の固相状態になる性質と、第１の固
相状態と第２の固相状態とで照射光に対する反射光量が
異なる性質とを有する記録層と、記録層の上および下に
形成された記録層より高融点な第１および第２の保護層
と、第２の保護層の上に形成され記録層を透過した光を
反射させて記録層に再入射させる反射層とを有し、記録
層の膜厚変動に対して記録層の光エネルギーの吸収によ
る到達温度の変動幅が±２０Ｋ以下であることを特徴と
する光情報記録媒体。(1) The property of absorbing energy through light irradiation, raising the temperature, melting, and rapidly changing to the first solid state, and the second solid state by heating the first solid state and slowly cooling it. and a recording layer having a property that the amount of reflected light with respect to irradiation light is different between the first solid state and the second solid state, and a recording layer having a higher melting point than the recording layers formed above and below the recording layer. It has first and second protective layers, and a reflective layer formed on the second protective layer to reflect the light transmitted through the recording layer and make it re-enter the recording layer. An optical information recording medium characterized in that the variation range of the temperature reached by absorption of optical energy in the recording layer is ±20K or less.
令して第１の固相状態になる性質と、第１の固相状態を
昇温し除冷して第２の固相状態になる性質と、第１の固
相状態と第２の固相状態とで照射光に対する反射光量が
異なる性質とを有する記録層と、記録層の上および下に
形成された記録層より高融点な第１および第２の保護層
と、第２の保護層の上に形成された記録層を透過した光
を反射させて記録層に再入射させる反射層とを有し、記
録層の膜厚増加に対する記録層での光吸収率の変化率が
入射光量を１００％として−３％／ｎｍ以上１０％／ｎ
ｍ以下であることを特徴とする光情報記録媒体。(2) The property of absorbing energy through light irradiation, raising the temperature, melting, and rapidly changing to the first solid state, and the second solid state by heating the first solid state and slowly cooling it. and a recording layer having a property that the amount of reflected light with respect to irradiation light is different between the first solid state and the second solid state, and a recording layer having a higher melting point than the recording layers formed above and below the recording layer. It has first and second protective layers that are formed on the second protective layer, and a reflective layer that reflects the light that has passed through the recording layer and makes it re-enter the recording layer. The rate of change in the light absorption rate in the recording layer with respect to the increase is -3%/nm or more, assuming the amount of incident light as 100%, or 10%/n
An optical information recording medium characterized in that it is less than m.
ｎ、Ｚｎ、Ｇｅ、Ｓｉ、Ａｓ、Ｐのうちから選択される
少なくとも２つの元素からなることを特徴とする請求項
（１）または（２）のいずれかに記載の光情報記録媒体
。(3) Recording layer material is Te, Sb, In, Se, Bi, S
2. The optical information recording medium according to claim 1, wherein the optical information recording medium is made of at least two elements selected from n, Zn, Ge, Si, As, and P.
ｂ、Ｙ、Ｇｅ、Ｚｒ、Ｓｎ、Ｎｂ、Ｖ、Ｍｇのうちから
選択される元素の酸化物または窒化物または硫化物もし
くはこれら化合物の混合物からなることを特徴とする請
求項（１）または（２）のいずれかに記載の光情報記録
媒体。(4) Protective layer material is Si, Al, Ta, Ti, Zn, S
Claim (1) or (1) characterized in that it consists of an oxide, nitride or sulfide of an element selected from b, Y, Ge, Zr, Sn, Nb, V, Mg or a mixture of these compounds. The optical information recording medium according to any one of 2).
ｉ、Ｐｔ、Ｗのうちから選択される少なくとも１つの元
素からなることを特徴とする請求項（１）または（２）
のいずれかに記載の光情報記録媒体。(5) Reflection layer material is Al, Cu, Au, Ag, Cr, N
Claim (1) or (2) characterized in that it consists of at least one element selected from i, Pt, and W.
The optical information recording medium according to any one of.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1174703A JPH0340240A (en) | 1989-07-06 | 1989-07-06 | Optical information recording medium |
| DE1990630026 DE69030026T2 (en) | 1989-06-19 | 1990-06-18 | Optical information recording medium |
| EP90111430A EP0404005B1 (en) | 1989-06-19 | 1990-06-18 | Optical information recording medium |
| US07/713,008 US5191565A (en) | 1989-06-19 | 1991-06-10 | Optical information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1174703A JPH0340240A (en) | 1989-07-06 | 1989-07-06 | Optical information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0340240A true JPH0340240A (en) | 1991-02-21 |
Family
ID=15983187
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1174703A Pending JPH0340240A (en) | 1989-06-19 | 1989-07-06 | Optical information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0340240A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7169533B2 (en) | 2001-03-19 | 2007-01-30 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium, method for manufacturing the same and recording/reproduction method |
-
1989
- 1989-07-06 JP JP1174703A patent/JPH0340240A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7169533B2 (en) | 2001-03-19 | 2007-01-30 | Matsushita Electric Industrial Co., Ltd. | Optical information recording medium, method for manufacturing the same and recording/reproduction method |
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