JPS5940336A - Information recording medium - Google Patents
Information recording mediumInfo
- Publication number
- JPS5940336A JPS5940336A JP57150325A JP15032582A JPS5940336A JP S5940336 A JPS5940336 A JP S5940336A JP 57150325 A JP57150325 A JP 57150325A JP 15032582 A JP15032582 A JP 15032582A JP S5940336 A JPS5940336 A JP S5940336A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- layer
- recording medium
- information recording
- protective film
- 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
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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/244—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only
- G11B7/246—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising organic materials only containing dyes
-
- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
-
- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
-
- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24314—Metals or metalloids group 15 elements (e.g. Sb, Bi)
-
- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
- G11B2007/24302—Metals or metalloids
- G11B2007/24316—Metals or metalloids group 16 elements (i.e. chalcogenides, Se, Te)
-
- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25706—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing transition metal elements (Zn, Fe, Co, Ni, Pt)
-
- 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
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/257—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers
- G11B2007/25705—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials
- G11B2007/25708—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of layers having properties involved in recording or reproduction, e.g. optical interference layers or sensitising layers or dielectric layers, which are protecting the recording layers consisting essentially of inorganic materials containing group 13 elements (B, Al, Ga)
Landscapes
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は光学式のビデオディスク、デジタルオーディオ
ディスク等に適用して好適な情報記録媒体に係る。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an information recording medium suitable for application to optical video discs, digital audio discs, and the like.
背景技術とその問題点
光学式のビデオディスク、デジタルオーディオディスク
等は既に実用化されるに至っているが、通常のこの種の
ディスクにおいては、一般ユーザーはそのディスクに記
録された情報を読出すのみの使用態様を採っている。一
般ユーザーにおいてその媒体、例えばディスクに任意の
情報を書込むことのできる記録可能な情報記録媒体も種
々提案されてはいるものの未だ普及されるに至っていな
い。BACKGROUND TECHNOLOGY AND PROBLEMS Optical video discs, digital audio discs, etc. have already been put into practical use, but with these types of discs, general users can only read the information recorded on the discs. The usage pattern is as follows. Although various recordable information recording media on which general users can write arbitrary information on the medium, such as a disk, have been proposed, they have not yet become widespread.
従来提案されている記録可能な情報記録媒体としては、
例えばその記録材料層として厚さの薄い低融点金属膜、
例えばビスマスＢｉ、テルルＴｅによって構成し、これ
にレーザー光を情報信号に応じて照射してこれを溶融さ
せ、その溶融部において透孔ないしは凹部よυなる機械
的形状変化としての記録ピットを形成してその情報記録
を行うようにしている。ところがこのような形状的記録
ビットを形成する記録態様を採るものにおいては、記録
層に対する溶融のだめにその書込みに大きな／４’ワー
を必要とし、またこのようにして例えば溶融によって形
成した記録ピットの形状もその制御がなしにくいために
ノイズレベルが高くなシ、マた解像度が低く高密度記録
がなしにくいという欠点を有する。Recordable information recording media that have been proposed so far include:
For example, as the recording material layer, a thin low melting point metal film,
For example, it is made of bismuth Bi and tellurium Te, and is irradiated with a laser beam in accordance with an information signal to melt it, and in the melted part, a recording pit is formed as a mechanical shape change such as a through hole or a recessed part. and record that information. However, in a recording mode that forms such a shaped recording bit, a large /4' power is required for writing in order to melt the recording layer, and in this way, for example, the recording pits formed by melting are Since the shape is difficult to control, the noise level is high, and the resolution is low, making it difficult to perform high-density recording.
これに対してこの情報記録を光学的特性変化によって行
うようにした情報記録媒体を本出願人によって先に提案
した。この種の光学的特性変化によってその記録を行う
ようにした情報記録媒体の例としては、例えば第１図に
示すようにぼりメチルメタクリレート等の光透過性の基
体（１）上にその光学的記録層としての例えば厚さ４０
０ＸのＳｂ ２８ｅａよシなる記録層（２）を設け、こ
れの上に反射層として例えば４００Ｘの厚さのＢｉ２Ｔ
ｅ３よりなる反射層（３）を設け、第１図中矢印ａに示
すように書込み情報に応じて変調された書込み光、例え
ば半導体レーザー光を照射して記録層（２）においてこ
のレーザー光による光エネルギーを熱エネルギーに変換
してこれによる加熱によって書込み情報に応じたパター
ンの光学的特性例えば透過率、反射率の変化を得ていわ
ば、光学的記録ビットによって情報の記録を行うように
しだものが提案された。In contrast, the present applicant has previously proposed an information recording medium in which this information recording is performed by changing optical characteristics. An example of an information recording medium in which information is recorded by a change in optical characteristics is, for example, as shown in FIG. For example thickness 40 as a layer
A recording layer (2) of 0X Sb 28ea is provided, and on top of this a recording layer (2) of Bi2T with a thickness of 400X is provided.
A reflective layer (3) made of E3 is provided, and as shown by the arrow a in FIG. A device that converts light energy into thermal energy and uses the resulting heating to obtain changes in the optical characteristics of a pattern, such as transmittance and reflectance, in accordance with the written information, so to speak, to record information using optical recording bits. was proposed.
また他の例としては例えば第２図に示すように、同様に
光透過性の基体（１）上に例えば厚さ４００ＸのＳｂ２
Ｓｅ３よシなる反射防止層（４）を被着し、これの上に
例えば厚さ４００ＸのＳｂ２Ｔｅ３よりなる記録層（５
）が形成され、同様に矢印ａに示すように基体（１）側
から記録情報に応じて変調された書込み光、例えば半導
体レーザー光を照射して記録層（５）においてこの光エ
ネルギーを熱エネルギーに変換して記録情報に応じたパ
ターンをもってこの記録層（５）における光学的特性例
えば透過率、反射率の変化を得てその記録をいわば光学
的記録ビットとして行うようになした情報記録媒体が提
案された。As another example, for example, as shown in FIG.
An antireflection layer (4) made of Se3 is deposited, and a recording layer (5) made of Sb2Te3 with a thickness of 400X is deposited on this.
) is formed, and similarly, as shown by arrow a, writing light modulated according to the recording information, such as semiconductor laser light, is irradiated from the substrate (1) side, and this light energy is converted into thermal energy in the recording layer (5). There is an information recording medium in which changes in optical properties such as transmittance and reflectance in the recording layer (5) are obtained with a pattern corresponding to the recorded information, and the information is recorded as so-called optical recording bits. was suggested.
ところが、これらいずれの情報記録媒体においても、そ
の書込みに際してその記録層において光学的特性の変化
のみならず、機械的変形が生じてＳ／Ｎの低下を来す場
合がある。これはその記録層（２）及び（５）、すなわ
ちＳｂ ２Ｓ ｅ ａ及びＳｂ２Ｔｅ３における夫々の
光学的特性の変化は、１６０℃以上及び６０℃以上にお
いて得られるものの、実際上書込みレーザー例えば半導
体レーザー光を照射した場合にその各光学的記録ビット
の中心部においてはかなシ高温に熱せられ、これによっ
て記録層或いはこれに積層された反射層若しくは反射防
止層が溶融されて機械的形状変化をも生じることによる
ものであることが見出された。従ってこの種情報記録媒
体に対する書込み光の・ぐワー、例えば半導体レーザー
光のパワーはこのような形状的変化が生ずることがない
ように厳密にそのノ卆ワーの設定を行う必要があって一
般ユーザーにおける普及型のビデオディスク或いはデジ
タルオーディオディスク等として用いる場合難点がある
。However, in any of these information recording media, during writing, not only changes in optical properties but also mechanical deformation may occur in the recording layer, resulting in a decrease in S/N. Although changes in the optical properties of the recording layers (2) and (5), that is, Sb 2S e a and Sb 2 Te 3, respectively, can be obtained at temperatures above 160°C and above 60°C, in practice, writing laser beams such as semiconductor laser beams When irradiated with irradiation, the center of each optical recording bit is briefly heated to a high temperature, which melts the recording layer or the reflective layer or antireflection layer laminated thereon, causing a mechanical shape change. It was found that this is due to the following. Therefore, it is necessary to strictly set the power of the writing light for this type of information recording medium, such as the power of semiconductor laser light, so that such shape changes do not occur, and general users There are some difficulties when using it as a popular video disc or digital audio disc.
発明の目的
本発明においては、このような光学的特性変化としてそ
の記録を行うようにした情報記録媒体において特にその
書込み光の・やワーを厳密に選定せずに比較的広い範囲
において形状的変化を来すことの無（Ｓ／Ｎの高い記録
を行うようにできるようにした情報記録媒体を提供する
ものである。Purpose of the Invention In the present invention, in an information recording medium in which such changes in optical characteristics are recorded, it is possible to record a shape change in a relatively wide range without strictly selecting the writing light or the power. An object of the present invention is to provide an information recording medium that can perform recording with high S/N without causing problems.
発明の概要
本発明においては、基体上に主として加熱により光学的
特性の変化として記録がなされる記録層を有する情報記
録媒体において、その記録時の力０熱温度より高い融点
を有し、記録層の機械的３杉状変化を抑止する効果を有
する高融点物質よりなる保護膜を被着する。SUMMARY OF THE INVENTION The present invention provides an information recording medium having a recording layer on a substrate in which changes in optical properties are recorded mainly by heating. A protective film made of a high melting point substance is applied, which has the effect of inhibiting mechanical deformation of the material.
実施例
第３図を参照して本発明による情報記録媒体の一例を説
明するも、この例においては第１図で説明した構成によ
る情報記録媒体に本発明を適用したもので、第３図中（
６）は本発明による情報記録媒体を全体として示す。ま
た第３図において第１図と対応する部分には同一符号を
付す。この例においては第１図で説明したように例えば
ポリメチルメタクリレートよシなる光透過性の基体（１
）上に、例えば厚さ４００ＸのＳｂ２Ｓｅ３よシなる記
録層（２）が蒸着等によって被着され、これの上に同様
に厚さ例えば４００ＸのＢ ｓ ２Ｔｅ ３よシなる反
射層（３）が例えば蒸着され、更にこれの上に、特に本
発明においては、この反射層（３）の融点例えばＢｉ２
Ｔｅ３における融点５８５℃よ９１００℃以上高い高融
点の金属、例えばＩｎ２Ｔｅ３． Ｍｎ 、 Ｎｉ 、
Ｃｒ 、 Ｎｉ −Ｃｒ合金、Ｎｈ−Ｃｒ合金、Ｍｎ
７ Ｃｕ −Ｎｉ合金等よシなる少なくとも記録層（
２）及び反射層（３）における機械的変形を抑止する保
護膜（７）を蒸着等によって例えば厚さ１５０又をもっ
て被着する。Embodiment An example of an information recording medium according to the present invention will be described with reference to FIG. 3. In this example, the present invention is applied to the information recording medium having the configuration explained in FIG. (
6) shows the information recording medium according to the present invention as a whole. Further, in FIG. 3, parts corresponding to those in FIG. 1 are given the same reference numerals. In this example, as explained in FIG.
), a recording layer (2) of Sb2Se3 with a thickness of 400X, for example, is deposited by vapor deposition or the like, and on top of this a reflective layer (3) of Bs2Te3 with a thickness of 400X, for example, is deposited. For example, the melting point of this reflective layer (3), e.g. Bi2
A metal with a high melting point higher than the melting point of 585°C in Te3 by 9100°C or more, such as In2Te3. Mn, Ni,
Cr, Ni-Cr alloy, Nh-Cr alloy, Mn
7 At least a recording layer (such as Cu-Ni alloy)
2) and a protective film (7) for suppressing mechanical deformation in the reflective layer (3) is deposited to a thickness of, for example, 150 mm by vapor deposition or the like.
また第４図は本発明を第２図で説明した構成を有する情
報記録媒体に適用した場合で、この場合においても例え
ばポリメチルメタクリレート等よシなる光透過性の基体
（１）上に例えば４００ Ｘの厚さを有するＳｂ２Ｓｅ
３よりなる反射防止層（４）を蒸着等によって被着し、
これの上に例えば厚さ４００ ＸのＳｂ ２Ｔｅ ３よ
りなる記録層（５）を例えば蒸着し、更にこれの上に本
発明においては第３図の例で説明した保護膜（力を蒸着
する。この場合においてもこの保護膜（力としては、表
面側の方の記録層（５）のＳｂ２Ｔｅ３の融点６２２℃
より１００℃以上高い前掲した各側の高融点金属によっ
て構成し得る。FIG. 4 shows a case where the present invention is applied to an information recording medium having the structure explained in FIG. Sb2Se with a thickness of
An antireflection layer (4) consisting of 3 is deposited by vapor deposition or the like,
On top of this, a recording layer (5) made of Sb 2 Te 3 having a thickness of 400×, for example, is deposited by vapor deposition, and furthermore, in the present invention, a protective film (deposited) as described in the example of FIG. 3 is deposited on top of this. In this case, the melting point of Sb2Te3 of the recording layer (5) on the surface side is 622°C.
The above-mentioned high melting point metals on each side can be made of metals having a temperature higher than 100°C.
尚、保護膜（力としては、上述した高融点金属層に限ら
ず高融点の樹脂膜を用いることができ、この場合におい
ては、例えば赤外線吸収の書込み光及び読出し光の波長
に対して吸収率の高い色素例えば赤外吸収剤を混入して
なる保護膜を用いることができる。このように色素を混
入した樹脂保護膜を用いるときは、保護膜表面からの反
射によるノイズを小さくできる効果がある。すなわち一
般に樹脂膜によって保護膜を形成する場合、通常スピナ
ー法で行われるだめ、その表面は比較的ギザギザな面と
なシ、これがために書込み光及び読出し光のこの保護膜
表面よシの反射によるノイズが生ずる恐れがある。そこ
で、この場合、この保護膜としては表面の光学的反射に
よる影響を受けることがないようにその厚さを充分大に
する必要を生ずるが、上述した光吸収の色素を混入して
おくときは、このような厚さを大とすることなく反射光
によるノイズの発生を効果的に回避できるので、この保
護膜を厚くすることに伴う剥離などの不都合を回避でき
る。In addition, the protective film is not limited to the above-mentioned high melting point metal layer, but a high melting point resin film can also be used. It is possible to use a protective film made by mixing a pigment with a high level of absorption, such as an infrared absorber.When using a resin protective film mixed with a pigment in this way, it has the effect of reducing noise caused by reflection from the surface of the protective film. That is, when a protective film is generally formed using a resin film, it is usually done using a spinner method, and the surface thereof is relatively jagged, which causes the reflection of writing and reading light from the surface of the protective film. Therefore, in this case, it is necessary to make the thickness of the protective film sufficiently large so as not to be affected by the optical reflection on the surface. When a dye is mixed in, it is possible to effectively avoid noise caused by reflected light without increasing the thickness, thereby avoiding inconveniences such as peeling that would otherwise be caused by making this protective film thicker. .
発明の効果
上述した本発明による情報記録媒体によれば、表面に高
一点の保護膜（力を被着するようにしたので、記録層（
２）或いは（５）に対してその書込みに際して、高温加
熱による各記録層、或いは反射層、または反射防止層に
おいてこれらがその融点以上に加熱された場合にこれが
変形１ようとしても、高融点保護膜（７）によってその
変形が抑えられるので形状変化を来すことなくその記録
を行うことができ、これに伴ってＳ／Ｎの高い記録及び
読出しを行うことができる。Effects of the Invention According to the information recording medium according to the present invention described above, since a high point protective film (force) is applied to the surface, the recording layer (
2) Or for (5), when writing, if each recording layer, reflective layer, or anti-reflection layer is heated above its melting point by high-temperature heating, even if this tends to deform 1, the high melting point protection Since the deformation is suppressed by the film (7), recording can be performed without causing any change in shape, and accordingly, recording and reading with high S/N can be performed.
因みに、第５図は各情報記録媒体によるビデオディスク
における記録レーザーノ母ワーとＣ／Ｎとの関係を測定
した結果を示すもので、同図中曲線６υは第１図で説明
した情報記録媒体の構成を採シ表面に保護膜（力が形成
されない場合、同図中曲線１５２及び６■は夫々第３図
で説明した本発明による情報記録媒体の構成を採シ、保
護膜（刀が夫々１５０ ＸのＭｎ 、 Ｎｉ −Ｃｒに
よって構成した夫々の測定結果を示す。この場合、キャ
リア信号Ｃとしては、５６ＭＨｚを記録し、ビデオバン
ド幅３０ＫＨｚでＣ／Ｎの測定をした。ディスクの回転
数は１８００ ｒｐｍとした。Incidentally, Fig. 5 shows the results of measuring the relationship between recording laser power and C/N on video discs using various information recording media, and the curve 6υ in the figure shows the relationship between the recording laser power and C/N for video discs using various information recording media. The curves 152 and 6 in the same figure represent the structure of the information recording medium according to the present invention explained in FIG. The results of measurements made using Mn and Ni-Cr of 150X are shown below. In this case, 56 MHz was recorded as the carrier signal C, and the C/N was measured with a video bandwidth of 30 KHz. The number of rotations of the disk was The speed was set at 1800 rpm.
これより明らかなように、Ｃ／Ｎ （Ｓ／Ｎ ）の高い
記録を行うことのできる・やワーの許容範囲は、曲線Ｉ
５２及び鰻に示された本発明による場合、曲線６１）に
示された保護膜（力を有しない場合のそれに比し格段的
に広がっていることが確認された。As is clear from this, the permissible range of power that allows high C/N (S/N) recording is the curve I
In the case of the present invention shown in 52 and eel, it was confirmed that the protective film shown in curve 61) was much wider than that in the case of no force.
第１図及び第２図は本発明と比較されるべき情報記録媒
体の各側の拡大路線的断面図、第３図及び第４図は夫々
本発明による情報記録媒体の各側の拡大断面図、第５図
は記録ノクワーとＣ／Ｎとの関係の測定曲線図である。
（１）は基体、（２）及び（５）は記録層、（力は保護
膜である。
第１図
第２図
第３図
′ｌ
第４図
第５図
記録Ｌ−’ｊ”パフ＝ （ｍＷ）□1 and 2 are enlarged sectional views of each side of an information recording medium to be compared with the present invention, and FIGS. 3 and 4 are enlarged sectional views of each side of an information recording medium according to the present invention, respectively. , FIG. 5 is a measurement curve diagram of the relationship between recording noise and C/N. (1) is the base, (2) and (5) are the recording layers, (the force is the protective film. Figure 1 Figure 2 Figure 3 'l Figure 4 Figure 5 Recording L-'j'' Puff= (mW)□
Claims (1)
がなされる記録層を有する情報記録媒体において、上記
記録時の加熱温度よシ高い融点を有し上記記録層の機械
的変形を抑止する高融点保護膜が設けられてなる情報記
録媒体。In an information recording medium having a recording layer on a substrate in which recording is performed mainly as a change in optical properties by heating, a high temperature recording layer having a melting point higher than the heating temperature during recording and suppressing mechanical deformation of the recording layer is used. An information recording medium provided with a melting point protective film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57150325A JPS5940336A (en) | 1982-08-30 | 1982-08-30 | Information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57150325A JPS5940336A (en) | 1982-08-30 | 1982-08-30 | Information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5940336A true JPS5940336A (en) | 1984-03-06 |
Family
ID=15494547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57150325A Pending JPS5940336A (en) | 1982-08-30 | 1982-08-30 | Information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5940336A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0353392A2 (en) * | 1988-07-30 | 1990-02-07 | Taiyo Yuden Co., Ltd. | Optical information recording medium |
| US5155723A (en) * | 1988-07-30 | 1992-10-13 | Yuden Co., Ltd. Taiyo | Optical information recording method and medium |
-
1982
- 1982-08-30 JP JP57150325A patent/JPS5940336A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0353392A2 (en) * | 1988-07-30 | 1990-02-07 | Taiyo Yuden Co., Ltd. | Optical information recording medium |
| US4990388A (en) * | 1988-07-30 | 1991-02-05 | Taiyo Yuden Co., Ltd. | Optical information recording medium |
| US5155723A (en) * | 1988-07-30 | 1992-10-13 | Yuden Co., Ltd. Taiyo | Optical information recording method and medium |
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