JPH05114165A - Optical disk - Google Patents
Optical diskInfo
- Publication number
- JPH05114165A JPH05114165A JP3273775A JP27377591A JPH05114165A JP H05114165 A JPH05114165 A JP H05114165A JP 3273775 A JP3273775 A JP 3273775A JP 27377591 A JP27377591 A JP 27377591A JP H05114165 A JPH05114165 A JP H05114165A
- Authority
- JP
- Japan
- Prior art keywords
- protective film
- film
- optical disk
- dust
- contact angle
- 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
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は光ディスクに係り、特に
光ディスク形成用の樹脂基板のレーザ光の入射面側に保
護膜を設けた光ディスクに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc, and more particularly to an optical disc having a protective film provided on a laser light incident surface side of a resin substrate for forming an optical disc.
【０００２】近年、大容量の文書データや、画像情報を
記憶させる情報記憶媒体として、光ディスクが脚光を浴
びている。光ディスクは、１μm 程度に絞られたレーザ
光により情報の記録や、再生を行うため、大容量の情報
が記憶できる。In recent years, optical discs have been spotlighted as information storage media for storing large-capacity document data and image information. Since an optical disc records and reproduces information with a laser beam focused to about 1 μm, it can store a large amount of information.
【０００３】光ディスクの基板として安価で、軽量で有
ると言った理由で、透明樹脂基板が用いられることが多
く、そのため、該基板に傷や、塵埃（無機、および有機
塵埃）が付着し易い欠点がある。A transparent resin substrate is often used as a substrate for an optical disk because it is inexpensive and lightweight, and therefore scratches and dust (inorganic and organic dust) are likely to adhere to the substrate. There is.
【０００４】そのため、この傷の発生を防止するため
に、樹脂基板上に透明な有機化合物の保護膜、或いは透
明な無機化合物の保護膜がレーザ光の入射面側に被着形
成されている。Therefore, in order to prevent the occurrence of the scratches, a transparent organic compound protective film or a transparent inorganic compound protective film is formed on the resin substrate on the incident surface side of the laser beam.
【０００５】[0005]
【従来の技術】従来の光ディスクに於いては、傷の発生
を防止するためにレーザ光の入射面側に、樹脂基板より
表面硬度が高く、また塵埃の付着を防止するために樹脂
基板より表面抵抗の低い保護膜が用いられていた。2. Description of the Related Art In a conventional optical disk, the surface of the laser light incident surface has a higher hardness than that of a resin substrate in order to prevent scratches, and the surface of the resin substrate has a surface hardness to prevent dust from adhering. A protective film with low resistance was used.
【０００６】ところで、上記した従来の保護膜は、傷の
防止には大きい効果が有るが、無機物の塵埃、煙草の煙
のような有機物の塵埃の付着に対して、今一つ不十分で
余り効果が無い。そのため、光ディスクを定期的に布等
を用いて拭って清掃していたが、オイルミスト等の有機
塵埃が付着していると、清掃しても拭い切れず、清浄に
成らない。By the way, the above-mentioned conventional protective film has a great effect on the prevention of scratches, but it is not enough to adhere to the dust of inorganic substances and the dust of organic substances such as cigarette smoke. There is no. Therefore, the optical disc is regularly wiped with a cloth or the like for cleaning, but if organic dust such as oil mist is attached, the optical disc cannot be wiped off and cannot be cleaned.
【０００７】[0007]
【発明が解決しようとする課題】従って、従来の光ディ
スクでは付着塵埃の悪影響を受けて、情報の記録や再生
にエラーを発生し、精度良く情報の記録や再生を行うこ
とが困難である。Therefore, in the conventional optical disc, the adverse effect of the attached dust causes an error in recording or reproducing information, and it is difficult to record or reproduce information with high accuracy.
【０００８】本発明は上記した問題点を解決し、塵埃が
多少付着しても情報の記録、再生が影響され難い光ディ
スクの提供を目的とする。An object of the present invention is to solve the above-mentioned problems and to provide an optical disc in which the recording and reproducing of information is hardly affected even if dust is attached to some extent.
【０００９】[0009]
【課題を解決するための手段】本発明の光ディスクは、
記録膜を設けた樹脂基板のレーザ光の入射面側に保護膜
を備えた光ディスクに於いて、前記保護膜の表面粗さが
0.003 μm 以下で、かつ該保護膜に滴下した油滴の該保
護膜に対する接触角が20度以下であることを特徴とす
る。The optical disk of the present invention comprises:
In an optical disc having a protective film on the laser light incident surface side of a resin substrate provided with a recording film, the surface roughness of the protective film is
It is characterized in that it is 0.003 μm or less, and the contact angle of the oil droplets dropped on the protective film to the protective film is 20 degrees or less.
【００１０】また前記保護膜がスピンコート法より塗布
形成された有機化合物膜、或いは真空成膜法により形成
された無機化合物膜であることを特徴とする。更に前記
保護膜が樹脂基板より表面硬度が大であるか、或いは／
および表面抵抗が小さいことを特徴とするものである。Further, the protective film is characterized in that it is an organic compound film formed by spin coating or an inorganic compound film formed by vacuum film forming. Further, the protective film has a surface hardness higher than that of the resin substrate, or
And surface resistance is small.
【００１１】[0011]
【作用】請求項１に示すように、樹脂基板のレーザ光の
入射面側に、表面粗さが小さい保護膜を形成する。According to the first aspect of the present invention, the protective film having a small surface roughness is formed on the laser light incident surface side of the resin substrate.
【００１２】表面粗さが小さいことは、保護膜の微視的
な凹凸が少なく、無機塵埃がこの凹凸箇所に付着する機
会が少なくなるので、表面粗さは小さい方が良い。実験
の結果、保護膜の表面粗さは0.003 μm 以下で有ると、
長時間、無機塵埃の雰囲気で使用しても光ディスク面に
照射したレーザ光の反射強度は低下せず、このことより
塵埃の付着量が少なくなることが確認できた。Since the surface roughness is small, the microscopic unevenness of the protective film is small, and the chances of inorganic dust adhering to the uneven surface are small. Therefore, the surface roughness is preferably small. As a result of the experiment, if the surface roughness of the protective film is 0.003 μm or less,
It was confirmed that even when used in an atmosphere of inorganic dust for a long time, the reflection intensity of the laser beam applied to the optical disc surface did not decrease, and as a result, the amount of dust adhesion decreased.
【００１３】また請求項１に示すように、樹脂基板のレ
ーザ光の入射面側に設けた保護膜に油滴を滴下して、そ
の接触角を測定し、接触角が20度以下であると、長時
間、煙草の煙のような有機塵埃の雰囲気で使用しても、
光ディスク面に照射したレーザ光の反射強度は低下せ
ず、このことは接触角が小さい程、塵埃が広がり易く、
光の散乱が少なくなるため、光ディスク面に照射したレ
ーザ光の反射強度は低下しない。Further, as described in claim 1, oil droplets are dropped on the protective film provided on the laser light incident surface side of the resin substrate, and the contact angle is measured. If the contact angle is 20 degrees or less, Even when used for a long time in an atmosphere of organic dust such as cigarette smoke,
The reflection intensity of the laser beam applied to the optical disk surface does not decrease, which means that the smaller the contact angle, the easier the dust spreads,
Since the scattering of light is reduced, the reflection intensity of the laser light applied to the optical disk surface does not decrease.
【００１４】図4(a)、図4(b)に示すように、この接触角
θは樹脂基板のレーザ光の入射側に形成した保護膜４上
に油滴11を滴下した場合、この油滴11の自由表面と保護
膜４とが接触する位置での角度であり、この接触角θが
大である程、撥油性が大で、接触角が小さい程、撥油性
が小である。As shown in FIGS. 4 (a) and 4 (b), this contact angle θ is the same as when the oil droplet 11 is dropped on the protective film 4 formed on the laser beam incident side of the resin substrate. It is the angle at the position where the free surface of the droplet 11 contacts the protective film 4. The larger the contact angle θ, the greater the oil repellency, and the smaller the contact angle, the smaller the oil repellency.
【００１５】この撥油性が小、つまり接触角θが小さい
場合、保護膜４上に例えばオイルミストのような有機塵
埃が付着すると、この有機塵埃は数mmオーダーで広が
る。一方、該保護膜４上に記録再生用のレーザ光を照射
した場合、この光の直径は数μm のオーダーであるの
で、この拡がった有機塵埃にレーザ光を照射した場合、
レーザ光の散乱が少なくなり、記録、再生時のエラーの
発生が少なくなる。When the oil repellency is small, that is, when the contact angle θ is small, when organic dust such as oil mist adheres to the protective film 4, the organic dust spreads on the order of several mm. On the other hand, when the protective film 4 is irradiated with a laser beam for recording and reproduction, the diameter of this light is on the order of several μm, so when the spread organic dust is irradiated with a laser beam,
The scattering of laser light is reduced, and the occurrence of errors during recording and reproduction is reduced.
【００１６】そのため、レーザ光の散乱を防止する観点
より見ると、接触角θが少ない程が好ましい。またこの
保護膜は静電荷の帯電を防止して塵埃の付着を少なくす
るために、表面抵抗は小さい方が良く、また塵埃に依る
傷の発生を防止するために樹脂基板より硬度が大きいも
のが望ましい。Therefore, from the viewpoint of preventing the scattering of the laser light, it is preferable that the contact angle θ is smaller. Further, this protective film preferably has a small surface resistance in order to prevent electrostatic charge and reduce adhesion of dust, and has a hardness higher than that of the resin substrate in order to prevent scratches caused by dust. desirable.
【００１７】[0017]
【実施例】以下、図面を用いて本発明の実施例に付き詳
細に説明する。図１は本発明の光ディスクの断面図であ
る。図示するように、直径が５インチのポリカーボネイ
トのような透明の樹脂製の基板１のヘッド案内溝（図示
せず）に、テルビウム−二酸化シリコン(Tb-SiO2) 膜の
誘電体膜、テルビウム−鉄−コバルト(Tb-Fe-Co)のよう
な磁性膜、テルビウム−二酸化シリコン(Tb-SiO2) 膜の
誘電体膜およびアルミニウム(Al)のような反射膜を積層
した光記録膜２をスパッタ法で成膜した後、この基板１
を前記光記録膜２を対向させて接着剤３（商品名；ホッ
トメルトXW-13 、東亜合成化学株式会社製）を用いて貼
り合わせる。Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sectional view of an optical disk of the present invention. As shown in the figure, in the head guide groove (not shown) of the transparent resin substrate 1 such as polycarbonate having a diameter of 5 inches, a dielectric film of terbium-silicon dioxide (Tb-SiO 2 ) film, terbium- The optical recording film 2 is formed by laminating a magnetic film such as iron-cobalt (Tb-Fe-Co), a dielectric film of terbium-silicon dioxide (Tb-SiO 2 ) film and a reflective film such as aluminum (Al). This substrate 1 after film formation by the method
And the optical recording film 2 are made to face each other and bonded using an adhesive 3 (trade name: Hot Melt XW-13, manufactured by Toagosei Kagaku Co., Ltd.).
【００１８】次いで、この基板１の光記録膜２を形成し
た面の反対側の面に、アクリル系樹脂よりなる有機化合
物の保護膜４をスピンコート法を用いて塗布する。そし
てこの光ディスクの中心位置に該ディスクをディスク駆
動装置に装着するためのハブ５を接着して光ディスクを
形成する。Then, an organic compound protective film 4 made of an acrylic resin is applied to the surface of the substrate 1 opposite to the surface on which the optical recording film 2 is formed, by a spin coating method. Then, a hub 5 for mounting the disc in the disc drive is attached to the center position of the optical disc to form the optical disc.
【００１９】そしてこの保護膜のアクリル系樹脂に添加
する透明な無機質のSiO2よりなる充填剤を、前記アクリ
ル樹脂に対して１重量％の割合で添加する。そしてその
粒径を変化させて添加すると、粒径の大きい充填剤程、
表面粗さが大となるので、この添加する充填剤の直径を
変化させることで、表面粗さを変化させた保護膜を形成
した。Then, the transparent inorganic filler of SiO 2 added to the acrylic resin of the protective film is added at a ratio of 1% by weight to the acrylic resin. When the particle size is changed and added, the larger the particle size of the filler,
Since the surface roughness becomes large, the diameter of the filler to be added was changed to form the protective film with the changed surface roughness.
【００２０】そして、このように保護膜を形成した光デ
ィスクを、回転させた状態で、関東ローム層の土の微粉
末（粒径1 〜5 μm ）を、無機塵埃として充満させ、容
量が0.25m3のデシケータ内に設置する。そして該光ディ
スクを回転させた状態で0.5時間放置し、その後、この
光ディスクを、デシケータより取り出す。Then, while rotating the optical disk having the protective film thus formed, the fine powder of soil (particle size: 1 to 5 μm) in the Kanto loam layer is filled as inorganic dust to have a capacity of 0.25 m. Install in the desiccator of 3 . Then, the optical disc is left in a rotated state for 0.5 hour, and then the optical disc is taken out from the desiccator.
【００２１】そして、該光ディスクの中心Ｏより半径方
向に沿って35mmの位置の内周の位置Ｐ、該光ディスクの
中心Ｏより半径方向に沿って45mmの位置の中央の位置
Ｑ、該光ディスクの中心Ｏより半径方向に沿って55mmの
位置の外周の位置Ｒの３点にレーザ光を照射し、その反
射光の光量を測定して反射率を測定した。この反射率が
大である程、塵埃の付着量は少なく、また反射率が小で
ある程、塵埃の付着量は少ない。Then, a position P on the inner circumference at a position 35 mm from the center O of the optical disk in the radial direction, a central position Q at a position 45 mm from the center O of the optical disk in the radial direction, and the center of the optical disk Laser light was irradiated to three points at a position R on the outer periphery at a position 55 mm in the radial direction from O, and the light amount of the reflected light was measured to measure the reflectance. The larger the reflectance, the smaller the amount of dust attached, and the smaller the reflectance, the smaller the amount of dust attached.
【００２２】この光ディスクでは、内周と外周囲の位置
では、多少反射率が異なっており、該光ディスクを回転
させない状態の反射率の初期値から、所定時間後、回転
させた反射率の低下量が大である程、塵埃の付着量が大
となるので、その反射率の変動を光ディスクの半径方向
の所定の位置で測定した。In this optical disc, the reflectance is slightly different between the inner circumference and the outer circumference, and the amount of decrease in the reflectance after a predetermined time elapses from the initial value of the reflectance when the optical disc is not rotated. The larger the value, the larger the amount of dust attached, and therefore the fluctuation in the reflectance was measured at a predetermined position in the radial direction of the optical disc.
【００２３】このように表面粗さを変化させた保護膜を
形成した場合の反射率の変化量と、保護膜の表面粗さの
関係図を図２に示す。図の縦軸は、光ディスクを前記し
た関東ローム層の無機塵埃の充満したデシケータ内に設
置する以前に、該光ディスクの所定位置、つまりＰ、
Ｑ、Ｒの位置にレーザ光を照射し、その光ディスク面よ
り反射する反射光の反射強度を測定して、その反射率を
100％と仮定する。( 実際の反射率は20％程度である。)
次いで、この光ディスクを前記したデシケータ内に設置
し、所定時間経過後の光ディスクの反射率を測定し、こ
の反射率がＲ％と成ったとする。FIG. 2 shows a relationship diagram between the amount of change in reflectance and the surface roughness of the protective film when the protective film having the surface roughness thus changed is formed. The vertical axis of the figure indicates a predetermined position of the optical disc, that is, P, before the optical disc is installed in the desiccator filled with the inorganic dust of the Kanto loam layer.
Laser light is applied to the Q and R positions, the reflection intensity of the reflected light reflected from the optical disk surface is measured, and the reflectance is calculated.
Assume 100%. (The actual reflectance is about 20%.)
Next, this optical disk is placed in the desiccator described above, and the reflectance of the optical disk after a predetermined time has elapsed is measured, and it is assumed that the reflectance becomes R%.
【００２４】すると反射率の変化量は（Ｒ／初期値×10
0 ）％で表されるので、この値を縦軸に採って表した。
また横軸は光ディスクの半径方向の位置を示す。図の曲
線ｂ，ｃに示すように、表面粗さを0.005 μm、0.01μm
のように、0.003 μm より増加させると、反射率の変
化量は大となる。然し、曲線a に示すように、表面粗さ
が0.003 μm の保護膜を形成した光ディスクは殆ど反射
率の変化量は見られない。このことより、表面粗さは0.
003 μm 以下が望ましい。Then, the change amount of the reflectance is (R / initial value × 10
It is expressed as 0)%, so this value is plotted on the vertical axis.
The horizontal axis represents the radial position of the optical disc. As shown by curves b and c in the figure, the surface roughness is 0.005 μm, 0.01 μm
As shown in, the amount of change in reflectance becomes large when the thickness is increased from 0.003 μm. However, as shown by the curve a, the optical disc on which the protective film having the surface roughness of 0.003 μm is formed shows almost no change in the reflectance. From this, the surface roughness is 0.
003 μm or less is desirable.
【００２５】また、上記実施例に用いた保護膜のアクリ
ル系樹脂に、更にシリコンオイルを添加し、このシリコ
ンオイルの添加量を変化させて図４に示す油滴11の保護
膜４に対する接触角θを変化させることで、保護膜の撥
油性を変化させる。そして、このような接触角を異なら
させた保護膜を光ディスクに付着させて、この光ディス
クを煙草の煙を充満させたデシケータ内にディスクを回
転させたまま、２時間設置した後、この光ディスクを取
り出して、その反射率を前記したのと同様にして測定
し、その結果を図３に示す。Silicon oil is further added to the acrylic resin of the protective film used in the above embodiment, and the addition amount of this silicone oil is changed to change the contact angle of the oil droplet 11 shown in FIG. 4 with respect to the protective film 4. The oil repellency of the protective film is changed by changing θ. Then, such a protective film having a different contact angle is attached to the optical disc, and the optical disc is placed in a desiccator filled with cigarette smoke for 2 hours while rotating the disc, and then the optical disc is taken out. Then, the reflectance was measured in the same manner as described above, and the result is shown in FIG.
【００２６】この接触角θは、図４に示すように、日本
真空技術株式会社製で商品名がULVOIL R-7の真空ポンプ
用オイルの油滴11を保護膜４に滴下し、その接触角θを
実験的に測定した。As shown in FIG. 4, this contact angle θ is obtained by dropping an oil drop 11 of vacuum pump oil manufactured by Nippon Vacuum Technology Co., Ltd. under the trade name ULVOIL R-7 onto the protective film 4. θ was measured experimentally.
【００２７】図の縦軸は前記した反射率の変化量を示
し、横軸は光ディスクの半径方向の位置を示す。図の曲
線a に示すように、接触角θが20度であると反射率の変
化は殆ど見られず、図の曲線b 、c に示すように接触角
θが25度、40度と大になる程、反射率の低下が見られ
る。The vertical axis of the figure shows the amount of change in the reflectance described above, and the horizontal axis shows the position of the optical disk in the radial direction. As shown by the curve a in the figure, when the contact angle θ is 20 degrees, there is almost no change in reflectance, and as shown by the curves b and c in the figure, the contact angle θ is 25 degrees and 40 degrees. The lower the reflectance, the more.
【００２８】このことは、煙草の煙等の有機塵埃に対し
て、接触角が20度以下となる保護膜を用いると、長時間
使用しても有機塵埃の影響を受け難く、布等を用いて拭
き取り操作のような煩雑な清掃作業を行わなずに、長時
間使用しても、情報の記録再生に影響を受け難い光ディ
スクが得られることが判る。This means that if a protective film having a contact angle of 20 degrees or less against organic dust such as cigarette smoke is used, it is unlikely to be affected by the organic dust even if it is used for a long time. It can be seen that an optical disc that is not easily affected by the recording and reproduction of information can be obtained even when used for a long time without performing a complicated cleaning work such as a wiping operation.
【００２９】なお、本実施例では保護膜としてアクリル
系樹脂の有機化合物膜を用いたが、その他、ＩＴＯ（イ
ンジウム錫酸化物）のような無機化合物膜を保護膜とし
てスパッタ法等の真空成膜方法で形成して用いても良
い。In this embodiment, an organic compound film of acrylic resin is used as the protective film, but in addition, an inorganic compound film such as ITO (indium tin oxide) is used as the protective film in a vacuum film forming method such as a sputtering method. You may form and use it by the method.
【００３０】また前記した本発明の保護膜が樹脂基板よ
り表面硬度が大であるか、表面抵抗が小さいか、または
両者の性質を兼ね備えたものであると更に一層好まし
い。It is even more preferable that the protective film of the present invention described above has a surface hardness higher than that of the resin substrate, a surface resistance lower than that of the resin substrate, or has both properties.
【００３１】[0031]
【発明の効果】以上述べたように、本発明の光ディスク
によれば、長時間使用して仮に光ディスク面に塵埃が付
着したとしても、レーザ光の反射光に影響を及ぼさない
ので、情報の記録、再生に影響を及ぼさなくなり、拭き
取り作業の回数も少なくて済み、取扱が簡単で且つ高信
頼度の光ディスクが得られる効果がある。As described above, according to the optical disk of the present invention, even if dust adheres to the surface of the optical disk after being used for a long period of time, it does not affect the reflected light of the laser beam, so that information recording is possible. In addition, there is an effect that the reproduction is not affected, the number of wiping operations is small, and the optical disc is easy to handle and has high reliability.
【図１】 本発明の光ディスクの断面図である。FIG. 1 is a cross-sectional view of an optical disc of the present invention.
【図２】 保護膜の表面粗さと反射率の変化量との関係
図である。FIG. 2 is a diagram showing the relationship between the surface roughness of a protective film and the amount of change in reflectance.
【図３】 保護膜の接触角と反射率の変化量との関係図
である。FIG. 3 is a relationship diagram between a contact angle of a protective film and a change amount of reflectance.
【図４】 接触角の説明図である。FIG. 4 is an explanatory diagram of a contact angle.
1 基板 2 光記録膜 3 接着剤 4 保護膜 5 ハブ 11 油滴 1 substrate 2 optical recording film 3 adhesive 4 protective film 5 hub 11 oil drop
Claims (2)
光の入射面側に保護膜(4) を備えた光ディスクに於い
て、 前記保護膜(4) の表面粗さが0.003 μm 以下で、かつ該
保護膜(4) 上に滴下した油滴の該保護膜(4) に対する接
触角が、20度以下であることを特徴とする光ディスク。1. An optical disc having a protective film (4) on the laser light incident surface side of a substrate (1) provided with an optical recording film (2), wherein the surface roughness of the protective film (4) is An optical disk having a contact angle of not more than 0.003 μm and an oil droplet dropped on the protective film (4) with respect to the protective film (4) is 20 degrees or less.
ト法より塗布形成された有機化合物膜、或いは真空成膜
法により形成された無機化合物膜であることを特徴とす
る光ディスク。2. An optical disk, wherein the protective film (4) according to claim 1 is an organic compound film formed by spin coating or an inorganic compound film formed by vacuum film forming.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3273775A JPH05114165A (en) | 1991-10-22 | 1991-10-22 | Optical disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3273775A JPH05114165A (en) | 1991-10-22 | 1991-10-22 | Optical disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05114165A true JPH05114165A (en) | 1993-05-07 |
Family
ID=17532405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3273775A Pending JPH05114165A (en) | 1991-10-22 | 1991-10-22 | Optical disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05114165A (en) |
-
1991
- 1991-10-22 JP JP3273775A patent/JPH05114165A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH11203724A (en) | Optical disk and its production | |
| JPH10249264A (en) | Method and apparatus for forming protective coat | |
| JP2702905B2 (en) | optical disk | |
| JP3742583B2 (en) | Optical information recording medium and method for manufacturing optical information recording medium | |
| US4600682A (en) | Optical storage structure | |
| JP2001023239A (en) | Information recording disk and information recording and reproducing device | |
| JP3125370B2 (en) | optical disk | |
| JP3086501B2 (en) | optical disk | |
| JP3557863B2 (en) | Protective film forming apparatus and protective film forming method | |
| JPH05114165A (en) | Optical disk | |
| JPH097243A (en) | Magnetooptical disk and manufacturing method thereof | |
| JP2833197B2 (en) | optical disk | |
| JP2789837B2 (en) | optical disk | |
| JP2002288879A (en) | Phase change information recording medium | |
| US4625217A (en) | Broad band multilayer optical storage structure having a thin metallic optically transmissive layer | |
| JPH05159394A (en) | Production of optical disk | |
| JP4085300B2 (en) | Phase change optical disk medium and method for initializing the medium | |
| JPS6047247A (en) | Recording medium | |
| JP3200153B2 (en) | Optical information recording medium | |
| JP2002260285A (en) | Phase change optical recording medium and its initializing method | |
| JP2562428B2 (en) | Optical information recording medium | |
| JPH0362338A (en) | Overcoat layer for optical disk and its material | |
| JPH05325289A (en) | Magneto-optical recording medium | |
| JPH0652022U (en) | Magneto-optical disk | |
| JPH0831011A (en) | Optical disk |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20001017 |