JPH0221060B2 - - Google Patents

Info

Publication number
JPH0221060B2
JPH0221060B2 JP55059713A JP5971380A JPH0221060B2 JP H0221060 B2 JPH0221060 B2 JP H0221060B2 JP 55059713 A JP55059713 A JP 55059713A JP 5971380 A JP5971380 A JP 5971380A JP H0221060 B2 JPH0221060 B2 JP H0221060B2
Authority
JP
Japan
Prior art keywords
recording
layer
substrate
transparent
recording layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP55059713A
Other languages
Japanese (ja)
Other versions
JPS56156941A (en
Inventor
Manabu Yamamoto
Shuzo Fukunishi
Susumu Yonezawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP5971380A priority Critical patent/JPS56156941A/en
Publication of JPS56156941A publication Critical patent/JPS56156941A/en
Publication of JPH0221060B2 publication Critical patent/JPH0221060B2/ja
Granted legal-status Critical Current

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
    • G11B7/252—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
    • 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
    • G11B7/242—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
    • G11B7/247—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 methine or polymethine dyes
    • G11B7/2472—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 methine or polymethine dyes cyanine
    • 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
    • G11B7/2585—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 based on aluminium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Surface Treatment Of Optical Elements (AREA)

Description

【発明の詳細な説明】 本発明は例えばビデオデイスク等の光記録媒体
において媒体構成の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the structure of an optical recording medium such as a video disc.

従来発表されていたこの種の反射防止構造は第
１図に示すように基板１上に順次反射層４、透明
層３、記録層２、を積層し記録層２側からのレー
ザ光７の照射により記録層２を溶融蒸発させて信
号記録を行うものであつた。このような媒体構成
の場合、ゴミなどの付着を防ぐ保護膜は第２図に
示す構成で保護膜５、スペーサ６を設置する必要
があるが、このような保護膜構成の場合、回転に
よるたわみによつて、保護膜５と記録再生ヘツド
との衝突が生ずる危険性があること、第３図に示
すような基板１を保護膜としてかねるサンンドイ
ツチ構成に適用できないこと、及び、記録層２の
溶融蒸発により信号を記録するため、記録後、蒸
発物が媒体表面上に付着し、再生時のノズルが増
大するなどの欠点があつた。 This type of anti-reflection structure that has been announced in the past consists of stacking a reflective layer 4, a transparent layer 3, and a recording layer 2 on a substrate 1 in this order, as shown in FIG. The recording layer 2 was melted and evaporated to perform signal recording. In the case of such a media configuration, it is necessary to install a protective film 5 and a spacer 6 in the configuration shown in Figure 2 to prevent the adhesion of dust, etc.; As a result, there is a risk of a collision between the protective film 5 and the recording/reproducing head, that it cannot be applied to a Sandwich structure in which the substrate 1 can be used as a protective film as shown in FIG. Since signals are recorded by evaporation, evaporated matter adheres to the surface of the medium after recording, resulting in an increase in the number of nozzles during reproduction.

本発明は例えばビデオデイスク等のデイスク媒
体構成において、基板を保護膜とし、基板側から
の入射レーザ光に対し反射防止構造を形成し、記
録層の屈折率変化あるいは透過率変化により信号
記録録を行うことを特徴とし、その目的は、デイ
スク媒体構成において反射防止構造の適用を可能
とするとともに、媒体ノズルの低減を図ることに
ある。 For example, in a disk medium structure such as a video disk, the present invention uses a substrate as a protective film, forms an anti-reflection structure against incident laser light from the substrate side, and records a signal by changing the refractive index or transmittance of the recording layer. The purpose is to enable the application of an anti-reflection structure in a disk medium configuration and to reduce the number of medium nozzles.

以下図面を参照して本発明の実施例を詳細に説
明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.

第４図は本発明の一実施例であつて、第１の基
板１１１上に記録層１２１、透明層１３１、反射
層１４１を順次積層して反射防止構造を形成し、
第２の基板１１２上に記録層１２２、透明層１３
２、反射層１４２を順次積層して反射防止構造を
形成し、両基板１１１，１１２上に形成した記録
層１２１，１２２、透明層１３１，１３２、反射
層１４１，１４２が内側になるようにして各反射
層１４１，１４２を接着剤１８で接着して前記両
基板１１１，１１２をサンドイツチ構造とする。 FIG. 4 shows an embodiment of the present invention, in which a recording layer 121, a transparent layer 131, and a reflective layer 141 are sequentially laminated on a first substrate 111 to form an antireflection structure.
A recording layer 122 and a transparent layer 13 are provided on the second substrate 112.
2. Form an antireflection structure by sequentially laminating the reflective layers 142 so that the recording layers 121, 122, transparent layers 131, 132, and reflective layers 141, 142 formed on both substrates 111, 112 are on the inside. The reflective layers 141 and 142 are bonded together using an adhesive 18 to form the substrates 111 and 112 into a sandwich structure.

しかして、前記各基板１１１，１１２側からレ
ーザ光１７１，１７２を照射して前記記録層１２
１，１２２の屈折率変化もしくは透過率変化によ
り信号を記録する。この構成において、基板１１
１，１１２側から入射したレーザ光１７１，１７
２の反射率は各層（プラスチツク基板１１１，１
１２も含む）の複素屈折率及び膜厚により導出す
ることができる。 Then, the recording layer 12 is irradiated with laser beams 171 and 172 from the sides of the respective substrates 111 and 112.
A signal is recorded by a refractive index change or a transmittance change of 1,122. In this configuration, the substrate 11
Laser beams 171, 17 incident from the 1,112 side
The reflectance of each layer (plastic substrate 111, 1
12) and the film thickness.

今、各層の境界における振幅反射率、振幅透過
率をrj，tj（ｊ＝１〜４、例えば空気層と基板１１
１，１１２の境界における反射率と透過率はr1，
t1となる）各層の膜厚をdj、複素屈折率nc j＝nj−
iKjとする。基板１１１，１１２側から入射する
レーザビームの振幅をE+ 1、反射光の振幅をE- 1、
媒体透過光をE+ 5とすると次の式が成立する。 Now, the amplitude reflectance and amplitude transmittance at the boundary of each layer are r j , t j (j = 1 to 4, for example, between the air layer and the substrate 11
The reflectance and transmittance at the boundary of 1,112 are r 1 ,
t 1 )) The film thickness of each layer is d j , and the complex refractive index n c j = n j −
Let iK j . The amplitude of the laser beam incident from the substrates 111 and 112 side is E + 1 , the amplitude of the reflected light is E - 1 ,
If the light transmitted through the medium is E + 5 , the following equation holds true.

ここで δj＝2π／λnc jdj λ：記録レーザ波長 rj＝nc／j−nc／j+1／nc／j＋nc／j+1 tj＝2nc／j／nc／j＋nc／j+1 媒体からの反射率Ｒ＝｜E-／1／E+／1｜2は次の式で
示 される。 Here, δ j = 2π/λn c j d j λ: Recording laser wavelength r j = n c / j −n c / j+1 / n c / j + n c / j+1 t j = 2n c / j / n c / j + n c / j+1 The reflectance from the medium R = |E - / 1 /E + / 1 | 2 is expressed by the following formula.

Ｒ＝｜E-／1／E+／1｜2＝｜A21／A11｜2 ｜A21／A11｜2は各層の複素屈折率、膜厚および記 録レーザ波長の関数である。従つて、反射防止構
造を形成し得る複素屈折率をもつ材料を基板１１
１，１１２、記録層１２１，１２２、透明層１３
１，１３２、反射層１４１，１４２として用い、
それらの膜厚を制御することにより反射防止構造
が可能となる。実施例としては、λ＝830nm、基
板１１１，１１２をPMMA、記録層１２１，１
２２として、レーザの熱効果により透過率変化を
生ずるAsTe，AsSeTeなどの非晶質薄膜あるい
はシアニン色素、C43H35ClO6，
C39H34Cl3N3S2O4など、透明層１３１，１３２と
してSiO2、あるいはAs2S3、反射層１４１，１４
２としてTe，Bi、あるいはAlを用いることによ
り反射防止構造が可能であり、数mW半導体レー
ザにより信号記録再生が可能であつた。 R = |E - / 1 /E + / 1 | 2 = |A 21 /A 11 | 2 |A 21 /A 11 | 2 is a function of the complex refractive index of each layer, film thickness, and recording laser wavelength. Therefore, the substrate 11 is made of a material having a complex refractive index that can form an antireflection structure.
1, 112, recording layer 121, 122, transparent layer 13
1,132, used as reflective layer 141,142,
By controlling the thickness of these films, an antireflection structure becomes possible. As an example, λ=830 nm, the substrates 111 and 112 are PMMA, and the recording layers 121 and 1
22, an amorphous thin film such as AsTe or AsSeTe that causes a change in transmittance due to the thermal effect of the laser, or cyanine dye, C 43 H 35 ClO 6 ,
C 39 H 34 Cl 3 N 3 S 2 O 4 etc., SiO 2 as the transparent layer 131, 132, or As 2 S 3 , reflective layer 141, 14
By using Te, Bi, or Al as 2, an antireflection structure was possible, and signal recording and reproduction was possible with a several mW semiconductor laser.

このような反射防止構造では、反射率が零の時
記録感度が最大となるが、反射率が零でない場
合、例えば反射率が０〜10％の場合においても記
録可能であり、光記録媒体として用いることがで
きる。又、ビデオデイスクのように反射光を用い
た焦点制御を行う場合には、反射防止の条件を多
少くずして、媒体を構成する方が有効である。 In such an anti-reflection structure, the recording sensitivity is maximum when the reflectance is zero, but recording is possible even when the reflectance is not zero, for example, when the reflectance is 0 to 10%, and it can be used as an optical recording medium. Can be used. In addition, when performing focus control using reflected light as in the case of a video disk, it is more effective to configure the medium with some degree of anti-reflection conditions.

さらに、透明プラスチツクからなる基板と
SiO2あるいはAs2S3からなる透明層とで記録層を
直接挟み込むことによつて記録層の蒸発が抑圧さ
れることを第５図を用いて説明する。この第５図
は記録パワーと再生した信号出力の関係を示すも
のである。 Furthermore, a substrate made of transparent plastic and
It will be explained with reference to FIG. 5 that evaporation of the recording layer is suppressed by directly sandwiching the recording layer between transparent layers made of SiO 2 or As 2 S 3 . FIG. 5 shows the relationship between recording power and reproduced signal output.

基板上に記録層（AsTe）のみを形成して回転
数1800rpm、パルス幅100nSで記録・再生した実
験結果を第５図ａに示す。第５図ａより、記録パ
ワーに対する相変化を起こす範囲が狭く、記録パ
ワーを増加するとすぐ溶融蒸発が発生しているこ
とがわかる。 Figure 5a shows the results of an experiment in which only a recording layer (AsTe) was formed on the substrate and recording and reproduction were performed at a rotational speed of 1800 rpm and a pulse width of 100 nS. From FIG. 5a, it can be seen that the range in which the phase change occurs with respect to the recording power is narrow, and melting and evaporation occurs immediately when the recording power is increased.

これに対し、基板上に記録層（AsTe）、透明
層（SiO2）、反射層（Al）を形成したこの発明を
前記の例と同時に記録・再生した実験結果を第５
図ｂに示す。第５図ｂより、記録パワーに対する
相変化を起こす範囲が大きくなることがわかる。
これは、熱に強いSiO2を透明層に用いて、記録
層を基板上の間にはさみ込んでいるので、記録層
の蒸発が抑圧されているために記録パワーのマー
ジンが大きくなつていることによる。 In contrast, the experimental results of recording and reproducing the present invention in which a recording layer (AsTe), a transparent layer (SiO 2 ), and a reflective layer (Al) were formed on a substrate at the same time as in the above example are presented in the fifth section.
Shown in Figure b. From FIG. 5b, it can be seen that the range in which phase change occurs with respect to recording power becomes larger.
This is because heat-resistant SiO 2 is used for the transparent layer and the recording layer is sandwiched between the substrates, which suppresses evaporation of the recording layer and increases the recording power margin. by.

以上説明したように、基板上に記録層、透明
層、反射層を順次積層して、基板側から入射する
光に対し反射防止構造を形成し、記録層の屈折率
変化あるいは透過率変化により信号を記録する媒
体構成をとることにより、ビデオデイスク等にお
けるサンドイツチ型デイスク媒体における反射防
止構造の適用を可能とし、また、記録層の溶融蒸
発を防止する構造となつているので、媒体の信頼
性が向上し、記録後の媒体ノイズの増大を防ぐ利
点がある。 As explained above, a recording layer, a transparent layer, and a reflective layer are sequentially laminated on a substrate to form an antireflection structure against light incident from the substrate side, and a signal is generated by changing the refractive index or transmittance of the recording layer. By adopting a medium configuration for recording, it is possible to apply an anti-reflection structure to Sanderch-type disk media such as video disks, and the structure prevents melting and evaporation of the recording layer, which improves the reliability of the medium. This has the advantage of preventing an increase in media noise after recording.

【図面の簡単な説明】[Brief explanation of drawings]

第１図は従来の反射防止構造の光記録媒体構成
図、第２図は従来の反射防止構造光記録媒体構成
における保護膜形成法を示す図、第３図は従来の
サンドイツチ型光記録媒体構成図、第４図は本発
明の一実施例を示す断面図、第５図は記録パワー
と信号出力を示す図である。 １１１，１１２…基板、１２１，１２２…記録
層、１３１，１３２…透明層、１４１，１４２…
反射層、１８…接着剤。 Figure 1 is a configuration diagram of a conventional optical recording medium with an anti-reflection structure, Figure 2 is a diagram showing a method of forming a protective film in a conventional optical recording medium configuration with an anti-reflection structure, and Figure 3 is a configuration of a conventional sand-gerch type optical recording medium. FIG. 4 is a sectional view showing an embodiment of the present invention, and FIG. 5 is a diagram showing recording power and signal output. 111, 112... Substrate, 121, 122... Recording layer, 131, 132... Transparent layer, 141, 142...
Reflective layer, 18...Adhesive.

Claims (1)

【特許請求の範囲】[Claims] １ 透明プラスチツクからなる基板と、前記基板
上に形成された記録層と、SiO2あるいはAs2S3か
らなる前記記録層上に形成された透明層と、前記
透明層上に形成された反射層とからなり、前記基
板側からレーザ光を照射して前記記録層の屈折率
変化もしくは透過率変化により信号を記録するこ
とを特徴とする光学的記録媒体。1. A substrate made of transparent plastic, a recording layer formed on the substrate, a transparent layer formed on the recording layer made of SiO 2 or As 2 S 3 , and a reflective layer formed on the transparent layer. An optical recording medium characterized in that a signal is recorded by a change in refractive index or a change in transmittance of the recording layer by irradiating a laser beam from the substrate side.
JP5971380A 1980-05-06 1980-05-06 Optical recording medium Granted JPS56156941A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5971380A JPS56156941A (en) 1980-05-06 1980-05-06 Optical recording medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5971380A JPS56156941A (en) 1980-05-06 1980-05-06 Optical recording medium

Publications (2)

Publication Number Publication Date
JPS56156941A JPS56156941A (en) 1981-12-03
JPH0221060B2 true JPH0221060B2 (en) 1990-05-11

Family

ID=13121117

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5971380A Granted JPS56156941A (en) 1980-05-06 1980-05-06 Optical recording medium

Country Status (1)

Country Link
JP (1) JPS56156941A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58501883A (en) * 1981-11-09 1983-11-04 バロ−ス・コ−ポレ−ション Archival recording medium with improved information layer and associated substrate
WO1983001701A1 (en) * 1981-11-09 1983-05-11 Burroughs Corp Archival recording media for digital data storage using low power radiation
JPS59203252A (en) * 1983-05-06 1984-11-17 Ricoh Co Ltd Optical information recording medium
JPS6057553A (en) * 1983-06-01 1985-04-03 バロ−ス・コ−ポレ−シヨン Optical memory disc and manufacture thereof
JPS6042095A (en) * 1983-08-19 1985-03-06 Hitachi Ltd Information recording member
WO1985002482A1 (en) * 1983-12-02 1985-06-06 Burroughs Corporation Cost-reduced optical disk record
JPH0630168B2 (en) * 1984-11-30 1994-04-20 株式会社日立製作所 Optical information recording medium
JPH0264933A (en) * 1989-07-04 1990-03-05 Ricoh Co Ltd Optical information recording method
JP2833556B2 (en) * 1995-12-15 1998-12-09 株式会社日立製作所 Information recording member
KR100448323B1 (en) * 2000-11-21 2004-09-10 마츠시타 덴끼 산교 가부시키가이샤 Optical information recording and reproducing apparatus

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53120506A (en) * 1977-03-28 1978-10-21 Rca Corp Information recorder
JPS5538665A (en) * 1978-09-08 1980-03-18 Matsushita Electric Ind Co Ltd Optical recording member

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53120506A (en) * 1977-03-28 1978-10-21 Rca Corp Information recorder
JPS5538665A (en) * 1978-09-08 1980-03-18 Matsushita Electric Ind Co Ltd Optical recording member

Also Published As

Publication number Publication date
JPS56156941A (en) 1981-12-03

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