JPH0413777B2 - - Google Patents
Info
- Publication number
- JPH0413777B2 JPH0413777B2 JP57205802A JP20580282A JPH0413777B2 JP H0413777 B2 JPH0413777 B2 JP H0413777B2 JP 57205802 A JP57205802 A JP 57205802A JP 20580282 A JP20580282 A JP 20580282A JP H0413777 B2 JPH0413777 B2 JP H0413777B2
- Authority
- JP
- Japan
- Prior art keywords
- substrate
- molecular weight
- recording
- information recording
- recording medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000000758 substrate Substances 0.000 claims description 30
- 230000003287 optical effect Effects 0.000 claims description 27
- 238000002834 transmittance Methods 0.000 claims description 5
- 239000006082 mold release agent Substances 0.000 claims description 3
- 239000000178 monomer Substances 0.000 claims description 3
- 239000003505 polymerization initiator Substances 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 239000000314 lubricant Substances 0.000 claims description 2
- 239000004014 plasticizer Substances 0.000 claims description 2
- 239000003381 stabilizer Substances 0.000 claims description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 12
- 239000004926 polymethyl methacrylate Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 6
- 239000004417 polycarbonate Substances 0.000 description 5
- 229920000515 polycarbonate Polymers 0.000 description 5
- 238000005266 casting Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- 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
-
- 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
- G11B7/253—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 substrates
- G11B7/2533—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 substrates comprising resins
-
- 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
- G11B7/258—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 reflective layers
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
産業上の利用分野
本発明は、光学式ビデオデイスク、光学式デジ
タルオーデイオデイスク等に適用して好適な光学
式情報記録媒体に係る。
背景技術とその問題点
一般のビデオデイスク、デジタルオーデイオデ
イスク等において、一般ユーザー側での情報の記
録ができるようになされた情報記録媒体はいまだ
普及されるに至つていない。このようなビデオデ
イスク、デジタルオーデイオデイスク等の光学式
情報記録媒体において一般ユーザーの側でその媒
体に任意の情報を記録することができるようにす
るにはできるだけ小さいパワーでの記録ができる
情報記録媒体が要求される。この種情報記録媒体
においてその記録の低パワー化のためにその記録
材層に関しての工夫は種々なされている。例えば
先に本出願人によつて提案した情報記録媒体にお
いては、その記録層が主として熱によつて光学的
特性が変化する材料層より構成されるものであ
り、この媒体に、記録信号によつて変調されたレ
ーザー光を照射させることによつてその光エネル
ギーを熱エネルギーに変換して記録層において光
学的特性変化が得られるようにした情報記録媒体
が提案された。この情報記録媒体は、例えば第１
図に示すように透明基板、例えばガラス板或いは
ポリメチルメタクリレート（PMMA）の注型及
び重合作業によるいわゆるキヤステイング板、若
しくはこのPMMAの溶融成型、例えばインジエ
クシヨン成型による成型板等より成る基板１上に
厚さ350〓のSb2Se3層よりなる記録層２を設け、
更にこれの上に例えば厚さ492〓のBi2Te3よりな
る反射層３を設け、第１図中矢印ａに示すように
書き込み情報に応じて変調された書き込み光例え
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つて書き込み情
報に応じた光学的特性、即ち光透過率、反射率の
変化を得て、いわば光学的記録ビツトを形成する
ことによつてその記録を行うようにした記録パワ
ーの低減化を図るようにした情報記録媒体が提供
されている。
しかしながら従来この種、情報記録媒体におけ
る記録パワーの低減化は主として記録層に関して
行われているものであつて、その基板材料につい
ての考察は基板の熱伝導率に対する着目がなされ
ている程度に過ぎない。
すなわち、この種主として熱によつてその記
録、すなわち光学的特性変化によつて記録ビツト
を形成する光学式情報記録媒体における基板１
は、その熱定数（熱伝導率、熱拡散定数）に依存
し、基板の熱伝導率が大きいほどその記録がなし
にくいとされ、基板材料の蓄熱性が高いほどその
記録がされ易いとされている。
しかしながら、実際上は、このような光学式情
報記録媒体における記録パワー、特に、その記録
を光透過率、反射率等の光学的特性の変化として
記録するようにした情報記録媒体における記録パ
ワーは、必ずしも基板材料の熱定数に顕著に依存
する結果が得られていない。
発明の目的
本発明は、その記録を、光透過率、反射率等の
光学的特性の変化として記録するようにした情報
記録媒体において、顕著に記録パワーの低減化を
はかることができるようにした光学式情報記録媒
体を提供せんとするものである。
発明の概要
本発明においては、本発明者等による種々の研
究考察の結果、上述したように、その記録を、光
透過率、反射率等の光学的特性の変化として記録
するようにした情報記録媒体において、その記録
パワーの低減化は、その光学的記録がなされる記
録層を担持する基板の、これに最終的に残存する
低分子量成分、すなわち揮発分の総量が大きく影
響することを究明し、この究明に基いてなされた
発明である。
すなわち、本発明においては、基板上に光学的
特性変化として記録がなされる記録層を有する光
学式情報記録媒体において、この基板がこれに添
加される離型剤、重合開始剤、分子量調節剤、安
定剤、滑剤、可塑剤等の分子量約400以下の低分
子量添加剤や、この基板に残存するモノマー、オ
リゴマー等の低分子成分、更には基板として成型
体に付加させた低分子量物質等の総ての分子量約
400以下の低分子量成分の総量が0.8重量％以上が
最終的に基板成分に存在させるようにする。
実施例
実施例 １
第２図に示すように、厚さ1.2mmで、インジエ
クシヨン成型によつて得たPMMA基板１１上に、
厚さ350〓のSb2Se3の蒸着層より成る記録層１２
を被着し、これの上に厚さ492〓のBi2Teの蒸着
層より成る反射層１３を被着して光学式情報記録
媒体１４を得、これを試料番号１とする。この実
施例１すなわち試料番号１における基板１１の成
型体中には、分子量240〜400の離型剤、重合開始
剤、残存モノマー等によつて低分子量総量が1.2
重量％存在するものが用いられた。
実施例 ２
実施例１と同様の構成によるも、その基板１１
とて、低分子量総量が1.0重量％の同様のPMMA
インジエクシヨン成型体を用いた。この実施例２
による情報記録媒体を試料番号２とする。
実施例 ３
実施例１と同様の構成によるも、その基板１１
として、低分子量総量が0.8〜0.9重量％の同様の
PMMAインジエクシヨン成型体を用いた。この
実施例３による情報記録媒体を試料番号３とす
る。
比較例 １〜３
夫々実施例１と同様の構成によるも、その基板
１１として、低分子量総量が夫々0.6重量％、0.5
重量％、0.4重量％の夫々同様のPMMAインジエ
クシヨン成型体を用い情報記録媒体を得、これら
を試料番号４〜６とする。
実施例 ４
実施例１と同様の構成によるも、その基板１１
として、低分子量総量が約200ppmのポリカーボ
ネート（PC）インジエクシヨン成型体を用いた。
この実施例４による情報記録媒体を試料番号７と
する。
各試料１〜７によつて夫々記録部分が直径100
mmとしたデイスクを得、これらに対し、夫々回転
数1800rpmで、波長8300〓、120ｍＡで半導体レ
ーザーによつて記録を行つた。このときのデイス
ク面における実質的な盤面記録パワーは3.6ｍＷ
に相当する。この時の各試料１〜７による各デイ
スクにおける再生出力を表１に示す。
INDUSTRIAL APPLICATION FIELD The present invention relates to an optical information recording medium suitable for application to optical video discs, optical digital audio discs, and the like. BACKGROUND TECHNOLOGY AND PROBLEMS Information recording media that allow general users to record information, such as general video disks and digital audio disks, have not yet become widespread. In order to enable general users to record arbitrary information on optical information recording media such as video discs and digital audio discs, information recording media that can be recorded with as little power as possible. is required. In order to reduce the recording power of this type of information recording medium, various improvements have been made to the recording material layer. For example, in the information recording medium previously proposed by the applicant, the recording layer is mainly composed of a material layer whose optical properties change with heat, and the medium is An information recording medium has been proposed in which optical characteristics can be changed in a recording layer by irradiating a modulated laser beam and converting the optical energy into thermal energy. This information recording medium is, for example, a first
As shown in the figure, a substrate 1 is formed of a transparent substrate, such as a glass plate, a so-called casting plate made by casting and polymerizing polymethyl methacrylate (PMMA), or a molded plate made by melt-molding PMMA, such as injection molding. A recording layer 2 consisting of three Sb 2 Se layers with a thickness of 350 mm was provided,
Furthermore, a reflective layer 3 made of Bi 2 Te 3 having a thickness of 492 mm, for example, is provided on this layer, and a writing light, such as a semiconductor laser beam, modulated according to the written information is irradiated as shown by the arrow a in FIG. The optical energy of this laser beam is converted into thermal energy in the recording layer 2, and by heating with this, optical characteristics corresponding to the written information, that is, changes in light transmittance and reflectance, are obtained, so to speak, optical recording is performed. An information recording medium is provided in which recording is performed by forming bits, thereby reducing the recording power. However, in the past, the reduction of recording power in this type of information recording medium has mainly been carried out with respect to the recording layer, and consideration of the substrate material has only focused on the thermal conductivity of the substrate. . That is, the substrate 1 of this optical information recording medium in which recording is mainly performed by heat, that is, recording bits are formed by changing optical characteristics.
depends on its thermal constants (thermal conductivity, thermal diffusion constant), and it is said that the higher the thermal conductivity of the substrate, the more difficult it is to record it, and the higher the heat storage property of the substrate material, the easier it is to record it. There is. However, in reality, the recording power of such an optical information recording medium, especially the recording power of an information recording medium that records changes in optical properties such as light transmittance and reflectance, is The results do not necessarily depend significantly on the thermal constant of the substrate material. Purpose of the Invention The present invention makes it possible to significantly reduce the recording power in an information recording medium in which recording is performed as changes in optical characteristics such as light transmittance and reflectance. The present invention aims to provide an optical information recording medium. Summary of the Invention In the present invention, as a result of various research and considerations by the present inventors, as described above, the present invention provides an information recording system in which the recording is performed as a change in optical properties such as light transmittance and reflectance. We have discovered that the reduction in recording power in media is greatly influenced by the total amount of low molecular weight components, that is, volatile components, that ultimately remain in the substrate that supports the recording layer on which optical recording is performed. , this invention was made based on this investigation. That is, in the present invention, in an optical information recording medium having a recording layer on which optical property changes are recorded on a substrate, this substrate is provided with a mold release agent, a polymerization initiator, a molecular weight regulator, The total amount of low molecular weight additives with a molecular weight of approximately 400 or less such as stabilizers, lubricants, and plasticizers, low molecular weight components such as monomers and oligomers remaining on this substrate, and low molecular weight substances added to the molded product as a substrate. The molecular weight of
The total amount of low molecular weight components of 400 or less is made to be present in the final substrate component at least 0.8% by weight. Examples Example 1 As shown in FIG. 2, on a PMMA substrate 11 with a thickness of 1.2 mm obtained by injection molding,
Recording layer 12 consisting of a deposited layer of Sb 2 Se 3 with a thickness of 350 mm
A reflective layer 13 made of a vapor-deposited layer of Bi 2 Te having a thickness of 492 mm was deposited thereon to obtain an optical information recording medium 14, which is referred to as sample number 1. In the molded body of the substrate 11 in this Example 1, that is, sample number 1, the total low molecular weight was 1.2 due to the mold release agent with a molecular weight of 240 to 400, the polymerization initiator, the residual monomer, etc.
% by weight was used. Example 2 Although the structure is similar to that of Example 1, the substrate 11
Similar PMMA with a total low molecular weight of 1.0% by weight
An injection molded body was used. This example 2
Sample number 2 is the information recording medium according to the above. Example 3 Although the structure was similar to that of Example 1, the substrate 11
As a similar product with a total low molecular weight of 0.8-0.9% by weight
A PMMA injection molded body was used. The information recording medium according to Example 3 is designated as sample number 3. Comparative Examples 1 to 3 Same structure as Example 1, but the total low molecular weight of the substrate 11 was 0.6% by weight and 0.5% by weight, respectively.
Information recording media were obtained using similar PMMA injection moldings of 0.4% and 0.4% by weight, respectively, and these were designated as sample numbers 4 to 6. Example 4 Although the structure is similar to that of Example 1, the substrate 11
A polycarbonate (PC) injection molded body with a total low molecular weight of about 200 ppm was used.
The information recording medium according to Example 4 is designated as sample number 7. The recording area for each sample 1 to 7 is 100 mm in diameter.
Discs of 1.0 mm were obtained, and recording was performed on each of them using a semiconductor laser at a rotation speed of 1800 rpm, a wavelength of 8300 mm, and 120 mA. At this time, the actual recording power on the disc surface was 3.6 mW.
corresponds to Table 1 shows the reproduction output on each disk for each of Samples 1 to 7 at this time.
【表】
表１より明らかなように、本発明による試料１
〜３は、試料４〜６に比し、高い再生出力、云い
換えれは記録パワーの低減化をはかることができ
ることがわかる。
尚、試料１〜６においてPMMAが基板材料と
して用いられ、試料７においてPCが用いられて
いるものであり、PMMAは、その熱伝導率が
5cal・s-1・cm-1、C°-1、熱拡散定数が1.2cm2・s-1
程度であるに比し、PCのそれらは4.6cal・s-1・
cm-1、C°-1、0.85cm2・s-1であつて、これら熱定数
の比較によれば、PMMAを用いた場合、PCを用
いた場合に比しその記録再生特性が劣るべきもの
が、本発明による試料１〜３によれば、PCを用
いた試料７と同程度ないしはそれ以上にすぐれた
特性を示すものが得られることがわかる。
尚、デイスク径が大になるにつれ、その回転の
レーザー光との相対的線速度がその周辺で大とな
るので、その周辺部においても良好な記録をなす
ための最適の盤面記録パワーは大きくなる。第３
図はこのデイスクの径と、その良好な記録をなす
ための最適盤面記録パワーとの関係を示したもの
で、同図中曲線２１は、実施例１、と同様の構成
によるも、その基板として従来の低分子総量が
0.8重量％未満のキヤステイングによるPMMA基
板を用いた場合、曲線２２及び２３は夫々低分子
総量が1.0重量％、1.6重量％とした同様の
PMMA基板を用いた本発明による場合のそれで、
これら曲線２１と２２及び２３とを比較すること
によつて明らかなように本発明による場合、最適
記録パワーを充分低めることができることがわか
り、例えば曲線２３による本発明によるデイスク
において、そのデイスク径を200mmとしても、そ
の記録パワーは、曲線２１による従来のそれの
120mm径のときの記録パワーで良いことがわかる。
発明の効果
上述したように、本発明の光学式情報記録媒体
によれば、記録パワーの低減化がはかられるの
で、書き込みレーザ光の駆動電流を小さくするこ
とができ、これに伴つてレーザー光源の使用可能
の寿命を高めることができ、また、一般ユーザー
側での書き込みを可能にするビデオデイスク、オ
ーデイオデイスクの普及化に貢献するところが大
である。また同一パワーで大径のデイスク化が可
能となり、記録内容の増大化においてその利益は
極めて大である。
尚、本発明による記録媒体において、その記録
パワーの低減化、或いは再生出力の向上がはから
れる理由は未だ明確な解明は得られていないもの
の、基板１１の低分子材料、すなわち揮発成分が
存在することによつて記録時のレーザー光照射に
よる記録層の加熱によつて基板１１の記録層側の
その加熱記録部においてその揮発成分の揮発効果
によつて気泡ないしは膨出が生じ、この記録部に
形状的変化による光学的特性変化も生じさせてい
ることによるとも考えられる。[Table] As is clear from Table 1, sample 1 according to the present invention
It can be seen that in Samples 4 to 3, a higher reproduction output, or in other words, a reduction in recording power, can be achieved compared to Samples 4 to 6. In addition, PMMA is used as the substrate material in Samples 1 to 6, and PC is used in Sample 7, and PMMA has a thermal conductivity of
5cal・s -1・cm -1 , C° -1 , thermal diffusion constant is 1.2cm 2・s -1
Compared to those of PC, it is 4.6 cal・s -1・
cm -1 , C° -1 , and 0.85 cm 2 s -1 , and according to a comparison of these thermal constants, when PMMA is used, the recording and reproducing characteristics should be inferior to when using PC. However, it can be seen that Samples 1 to 3 according to the present invention exhibit properties comparable to or even better than Sample 7 using PC. Furthermore, as the disk diameter increases, the linear velocity of its rotation relative to the laser beam increases at the periphery, so the optimal disk recording power for good recording also increases at the periphery. . Third
The figure shows the relationship between the diameter of this disk and the optimum disk recording power for good recording. Curve 21 in the figure shows that even though the structure is similar to that of Example 1, the substrate is Conventional total amount of small molecules
When using a PMMA substrate with less than 0.8 wt% casting, curves 22 and 23 show similar curves with a total low molecular weight of 1.0 wt% and 1.6 wt%, respectively.
In the case according to the present invention using a PMMA substrate,
As is clear from comparing these curves 21, 22, and 23, the optimum recording power can be sufficiently lowered in the case of the present invention.For example, in the disk according to the present invention according to curve 23, the disk diameter can be Even at 200 mm, its recording power is equal to that of the conventional one according to curve 21.
It can be seen that the recording power is good when the diameter is 120mm. Effects of the Invention As described above, according to the optical information recording medium of the present invention, since the recording power can be reduced, the driving current of the writing laser beam can be reduced, and along with this, the laser light source can be reduced. In addition, it greatly contributes to the popularization of video discs and audio discs, which allow general users to write on them. Furthermore, it is possible to create a large-diameter disk with the same power, and the benefits are extremely large in terms of increasing the recorded content. Although it has not yet been clearly elucidated why the recording medium according to the present invention is able to reduce its recording power or improve its reproduction output, By heating the recording layer by laser beam irradiation during recording, bubbles or bulges are generated in the heated recording area on the recording layer side of the substrate 11 due to the volatilization effect of the volatile components, and this recording area This is also thought to be due to the fact that changes in optical properties are also caused by changes in shape.
第１図は本発明と比較されるべき情報記録媒体
の略線的拡大断面図、第２図は本発明による光学
式情報記録媒体の一例の略線的拡大断面図、第３
図は、デイスク径と最適盤面記録パワーとの関係
を示す特性曲線図である。
１１は基板、１２は記録層、１３は反射層であ
る。
FIG. 1 is a schematic enlarged cross-sectional view of an information recording medium to be compared with the present invention, FIG. 2 is a schematic enlarged cross-sectional view of an example of an optical information recording medium according to the present invention, and FIG.
The figure is a characteristic curve diagram showing the relationship between the disk diameter and the optimum disk recording power. 11 is a substrate, 12 is a recording layer, and 13 is a reflective layer.
Claims (1)
性変化として記録がなされる記録層を有する光学
式情報記録媒体において、 上記基板が、該基板に添加される離型剤、重合
開始剤、分子量調節剤、安定剤、滑剤、可塑剤等
の低分子量添加剤、この基板に残存するモノマ
ー、オリゴマー等の分子量約400以下のすべての
低分子量成分の総量として0.8重量％以上有して
成ることを特徴とする光学式情報記録媒体。[Scope of Claims] 1. An optical information recording medium having a recording layer on a substrate in which changes in optical properties are recorded due to light transmittance or reflectance, wherein the substrate is provided with a mold release agent added to the substrate. 0.8% by weight or more as the total amount of all low molecular weight components with a molecular weight of approximately 400 or less, such as low molecular weight additives such as polymerization initiators, molecular weight regulators, stabilizers, lubricants, and plasticizers, monomers and oligomers remaining on this substrate. An optical information recording medium comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57205802A JPS5996544A (en) | 1982-11-24 | 1982-11-24 | Optical information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57205802A JPS5996544A (en) | 1982-11-24 | 1982-11-24 | Optical information recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5996544A JPS5996544A (en) | 1984-06-04 |
| JPH0413777B2 true JPH0413777B2 (en) | 1992-03-10 |
Family
ID=16512919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57205802A Granted JPS5996544A (en) | 1982-11-24 | 1982-11-24 | Optical information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5996544A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5386756A (en) * | 1976-10-15 | 1978-07-31 | Philips Nv | Plastic information carrier duplicating process and plastic record carrier and molding resin |
| JPS5532298A (en) * | 1978-08-28 | 1980-03-06 | Mca Disco Vision | Producing video disk structure |
| JPS5727494A (en) * | 1980-07-23 | 1982-02-13 | Sharp Corp | Magneto-optical storage element |
| JPS5766538A (en) * | 1980-10-08 | 1982-04-22 | Toshiba Corp | Information storage medium |
| JPS5794946A (en) * | 1980-10-15 | 1982-06-12 | Philips Nv | Information disk which can read optically |
| JPS57123208A (en) * | 1980-08-22 | 1982-07-31 | Kyowa Gas Chem Ind Co Ltd | Copolymer for optical information-recording carrier |
| JPS57172547A (en) * | 1981-04-17 | 1982-10-23 | Toshiba Corp | Information storage medium |
-
1982
- 1982-11-24 JP JP57205802A patent/JPS5996544A/en active Granted
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5386756A (en) * | 1976-10-15 | 1978-07-31 | Philips Nv | Plastic information carrier duplicating process and plastic record carrier and molding resin |
| JPS5532298A (en) * | 1978-08-28 | 1980-03-06 | Mca Disco Vision | Producing video disk structure |
| JPS5727494A (en) * | 1980-07-23 | 1982-02-13 | Sharp Corp | Magneto-optical storage element |
| JPS57123208A (en) * | 1980-08-22 | 1982-07-31 | Kyowa Gas Chem Ind Co Ltd | Copolymer for optical information-recording carrier |
| JPS5766538A (en) * | 1980-10-08 | 1982-04-22 | Toshiba Corp | Information storage medium |
| JPS5794946A (en) * | 1980-10-15 | 1982-06-12 | Philips Nv | Information disk which can read optically |
| JPS57172547A (en) * | 1981-04-17 | 1982-10-23 | Toshiba Corp | Information storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5996544A (en) | 1984-06-04 |
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