JP2619450B2 - Magneto-optical disk - Google Patents
Magneto-optical diskInfo
- Publication number
- JP2619450B2 JP2619450B2 JP62327137A JP32713787A JP2619450B2 JP 2619450 B2 JP2619450 B2 JP 2619450B2 JP 62327137 A JP62327137 A JP 62327137A JP 32713787 A JP32713787 A JP 32713787A JP 2619450 B2 JP2619450 B2 JP 2619450B2
- Authority
- JP
- Japan
- Prior art keywords
- resin
- magneto
- optical disk
- recording film
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、光磁気デイスクに係り、特に記録膜との接
触性が良く、しかも、磁界変調方式によるオーバライト
記録時のヘツド接触に対して、硬く強い保護膜を形成す
るのに好適な、光磁気デイスク保護膜構造に関する。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magneto-optical disk, and particularly to a magnetic recording disk, which has good contact with a recording film, and is capable of preventing head contact during overwrite recording by a magnetic field modulation method. And a magneto-optical disk protective film structure suitable for forming a hard and strong protective film.
従来の光磁気デイスクの記録膜表面の保護方法として
は、米国特許第4310919号に記載されているように、接
着剤を介し、別種の基板を重ね合わせる方法があつた
が、この方法では、生産性向上,コスト低下が図れない
という問題があつた。また、磁界変調方式によるオーバ
ライト記録も不可能である。As a conventional method for protecting the recording film surface of a magneto-optical disk, as described in U.S. Pat. No. 4,310,919, there has been a method in which another type of substrate is overlaid with an adhesive, but in this method, a production method is used. There is a problem that it is not possible to improve the performance and reduce the cost. Also, overwrite recording by a magnetic field modulation method is impossible.
そこで、実用新案昭61−153129号に記載されているよ
うに、記録膜を有する基盤表面を単層または多層の光透
過性樹脂膜で被覆するという方法が最近では実施されて
きている。Therefore, as described in Utility Model No. 61-153129, a method of covering the surface of a substrate having a recording film with a single-layer or multilayer light-transmitting resin film has recently been implemented.
前述した従来技術は、記録膜との接着性が良好で、か
つ表面硬度の硬い保護膜を形成する点については配慮さ
れておらず、磁界変調方式によるオーバライト記録を行
つた際に、生じる磁気ヘツドの保護膜への接触を考える
と、安定な記録・再生が可能な高品質光磁気デイスクと
しては不充分なものであつた。The prior art described above does not consider the fact that a protective film having good adhesion to the recording film and a hard surface is formed, and the magnetic field generated when performing overwrite recording by the magnetic field modulation method is not considered. Considering the contact of the head with the protective film, it was insufficient as a high-quality magneto-optical disc capable of stable recording and reproduction.
本発明の目的は、記録膜との接着性が良く、表面硬度
の硬い樹脂を光磁気デイスクに形成することにある。SUMMARY OF THE INVENTION It is an object of the present invention to form a resin having high adhesion to a recording film and a high surface hardness on a magneto-optical disk.
上記目的は、樹脂による保護膜を、単層または多層と
し、記録膜に接触する面または層には、記録膜との接着
性の良い樹脂を形成し、保護膜表面または最外層には、
硬度の硬い樹脂を形成することにより達成される。The above-mentioned object is to form a protective film made of a resin into a single layer or a multilayer, and form a resin having good adhesiveness with the recording film on a surface or a layer in contact with the recording film, and on the protective film surface or the outermost layer,
This is achieved by forming a hard resin.
保護膜として用いる樹脂に無機物からなる粉末を混入
して、数分間放置すると、粉末は自重により沈降する。
従つて、記録膜を有する光磁気デイスクの記録膜面に、
記録膜との接着性の良い樹脂と無機物からなる粉末の混
合物を塗布し、これを逆向きにして放置すると、樹脂層
の下部層(保護膜の外層)には、粉末が堆積する。これ
により、保護膜は二層に分離され、記録膜側には接着性
の良い層が、保護膜表面には、無機物からなる粉末によ
り硬い層が形成される。When a powder made of an inorganic material is mixed into a resin used as a protective film and left for several minutes, the powder sediments by its own weight.
Therefore, on the recording film surface of a magneto-optical disc having a recording film,
When a mixture of a resin and an inorganic powder having good adhesiveness to the recording film is applied, and the mixture is turned upside down and left to stand, the powder is deposited on the lower layer of the resin layer (outer layer of the protective film). As a result, the protective film is separated into two layers, and a layer having good adhesiveness is formed on the recording film side, and a hard layer is formed on the surface of the protective film by powder made of an inorganic substance.
一方、記録膜を有する基盤の上に、まず記録膜との接
着性の良い樹脂を塗布して半硬化する。次に別種の硬度
の硬い樹脂をさらに重ねて塗布したのち完全硬化する
と、先の半硬化した樹脂と表面硬度の硬い樹脂は密着性
良く接着でき、しかも記録膜との接着性も良好である。On the other hand, a resin having good adhesiveness with the recording film is first applied on the substrate having the recording film and semi-cured. Next, when a hard resin having another hardness is further applied and further cured, the semi-cured resin and the resin having a high surface hardness can be adhered with good adhesion, and the adhesion with the recording film is also good.
以上の方法により作製した光磁気デイスクは、第1図
(a)に示すような構造となり、記録膜の厚みの位置と
硬度(ビッカース硬度計による計測)の関係は第1図
(b)のようになつている。The magneto-optical disk manufactured by the above method has a structure as shown in FIG. 1A, and the relationship between the position of the thickness of the recording film and the hardness (measured by a Vickers hardness meter) is as shown in FIG. 1B. It has become.
また、このデイスクは、高温(60℃以上)、高湿(95
%以上)の環境下においても、記録膜との剥離は発生せ
ず、磁界変調方式によるオーバライト記録を行う際に生
じる保護膜への磁気ヘツド接触に対しても、保護膜の損
傷を防止できるようになるので、安定した記録・再生が
行える。In addition, this disk can be used at high temperature (60 ° C or higher), high humidity (95%
% Or more), no separation from the recording film occurs, and damage to the protective film can be prevented even when the magnetic head comes into contact with the protective film when performing overwrite recording by the magnetic field modulation method. As a result, stable recording and reproduction can be performed.
以下、本発明の実施例を図を用いて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[実施例1] 第2図に示すように、透光性で平坦な剥離性の良いス
タンパ8に、あらかじめ調合してある記録膜との接着性
の良い紫外線硬化樹脂と無機物からなる粉末(SiO2等)
の混合物4を同心円状に塗布する。次に、情報パターン
状に記録膜2を有する基盤1を、膜面を下に向け、泡が
入らないよう重ね合わせ、基盤1の裏面側から10kg以上
の加重をかけ、先の混合物4を均一に押し拡げる。基盤
1からはみ出した余分な混合物4を取り除いた後、混合
物4中の無機物からなる粉末が自重により沈降するま
で、数分間放置する。Example 1 As shown in FIG. 2, a powder (SiO) made of an ultraviolet curable resin having good adhesiveness to a recording film previously prepared and an inorganic material was applied to a transparent, flat, and highly releasable stamper 8. 2 etc.)
Is applied concentrically. Next, the substrate 1 having the recording film 2 in an information pattern is overlaid so that the film surface faces downward so that bubbles do not enter, and a weight of 10 kg or more is applied from the back side of the substrate 1 to homogenize the mixture 4 previously. And spread it out. After removing the excess mixture 4 protruding from the base 1, the mixture 4 is left for several minutes until the inorganic powder in the mixture 4 sediments by its own weight.
この後、スタンパ8側から紫外線9を照射し、混合物
4を硬化してスタンパ8を取り去る。このようにして作
製された光磁気デイスクは、保護膜表面が非常に硬く、
しかも接着性に優れており、従来では高温(60℃以
上)、高湿(95%)以上の環境下で試験した結果、数週
間で記録膜から剥離していた保護膜の寿命を数ケ月以上
に延長することができた。Thereafter, the mixture 4 is cured by irradiating ultraviolet rays 9 from the stamper 8 side, and the stamper 8 is removed. The magneto-optical disk manufactured in this way has a very hard protective film surface,
In addition, it has excellent adhesiveness. As a result of testing under high temperature (60 ° C. or more) and high humidity (95%) or more environment, the life of the protective film that has been peeled off from the recording film in several weeks is more than several months. Could be extended.
また、無機物の粉末としては、SiO2の他に、Al2O3・C
r2O3・ZrO2等の酸化物、Si3N4・BN等の窒化物、SiC等の
炭化物でも前述した効果と同様に保護膜を硬くすること
ができる。As the inorganic powder, in addition to SiO 2 , Al 2 O 3 .C
An oxide such as r 2 O 3 .ZrO 2, a nitride such as Si 3 N 4 .BN, and a carbide such as SiC can harden the protective film in the same manner as the above-described effect.
それと同時に、紫外線硬化樹脂と無機物の粉末との混
合物を塗布する方法も、上述以外に、スピンナーによる
スピン塗布でも可能である。At the same time, a method of applying a mixture of an ultraviolet curable resin and an inorganic powder can also be applied by spin coating using a spinner in addition to the above.
[実施例2] 第3図に示すように、記録膜2を有する基盤1を、回
転台10に取り付け、記録膜との接着性の良い紫外線硬化
樹脂5を、均一に回転塗布する。表面に塵や不純物が付
着していないのを確認した後紫外線9を照射する。この
時、紫外線9の照射時間は樹脂硬化の半分以下の範囲
(例えば1〜5秒)の間に設定し、樹脂5は半硬化の状
態とする。次に、再び樹脂5の付いた基盤1を回転台11
に取り付け、硬度の高い樹脂6を樹脂5の上に回転塗布
し、異物のないことを確認したら、紫外線9をこの時は
30秒照射する。これにより、下層の樹脂5と上層の樹脂
6の密着性が強化され、二層の間で剥離が起こるような
ことはなくなる。更に三層,四層と重ね続ける場合に
は、最外層の樹脂を硬化する時のみ30秒以上の紫外線を
照射すれば良い。それ以外の層の照射時間は1〜5秒以
内である。Example 2 As shown in FIG. 3, the substrate 1 having the recording film 2 is mounted on a turntable 10, and an ultraviolet curable resin 5 having good adhesion to the recording film is spin-coated uniformly. After confirming that dust and impurities do not adhere to the surface, ultraviolet rays 9 are irradiated. At this time, the irradiation time of the ultraviolet rays 9 is set within a range of half or less (for example, 1 to 5 seconds) of the curing of the resin, and the resin 5 is in a semi-cured state. Next, the base 1 with the resin 5 is again attached to the turntable 11.
And apply a high hardness resin 6 by spin coating on the resin 5 and confirm that there is no foreign matter.
Irradiate for 30 seconds. Thereby, the adhesiveness between the lower resin 5 and the upper resin 6 is strengthened, and peeling between the two layers does not occur. In the case where three or four layers are continuously stacked, it is sufficient to irradiate ultraviolet rays for 30 seconds or more only when curing the resin of the outermost layer. The irradiation time of the other layers is within 1 to 5 seconds.
[実施例3] 第2図,第3図に示した実施例では、保護膜材料の樹
脂は紫外線硬化樹脂に限定したが、熱硬化樹脂あるいは
嫌気性樹脂7を用いての作製も可能である。また、第4
図に示すように多層の場合は、紫外線硬化樹脂と熱硬化
樹脂あるいは嫌気性樹脂7による組合せも有効である。[Embodiment 3] In the embodiment shown in FIGS. 2 and 3, the resin of the protective film material is limited to the ultraviolet curable resin, but it is also possible to use the thermosetting resin or the anaerobic resin 7 for production. . Also, the fourth
As shown in the figure, in the case of a multilayer, a combination of an ultraviolet curable resin and a thermosetting resin or an anaerobic resin 7 is also effective.
以上の方法により作製した保護膜の厚みの位置に対す
る硬度の測定をビツカース硬度計により行つた結果を第
1図(b)に示す。これにより、最外層より約10μmの
厚さの場所の硬度は、内層部より硬いものとなつてお
り、その硬さは500g/cm2程度であることがわかる。FIG. 1 (b) shows the results obtained by measuring the hardness of the protective film produced by the above method with respect to the thickness position using a Vickers hardness tester. This shows that the hardness at the place having a thickness of about 10 μm from the outermost layer is harder than that of the inner layer part, and the hardness is about 500 g / cm 2 .
本発明によれば、光磁気デイスク基盤の上に、表面硬
度が硬く、記録膜との接着性の良い保護膜を形成するこ
とができるので、安定な記録・再生を行える高品質光磁
気デイスクとして効果がある。According to the present invention, a protective film having a high surface hardness and good adhesion to a recording film can be formed on a magneto-optical disk substrate, so that a high-quality magneto-optical disk capable of performing stable recording and reproduction can be obtained. effective.
【図面の簡単な説明】 第1図(a)は、本発明の光磁気デイスク構造の断面図
であり、(b)は、保護膜の厚さ方向の位置に対応する
硬度を示したものである。第2図は、本発明の実施例
1、第3図は、本発明の実施例2の光磁気デイスク保護
膜作製工程を示す断面図である。第4図は、本発明の実
施例3の光磁気デイスク構造を示す断面図である。 1……基盤、2……記録膜、3……保護膜(単・多層構
造)、4……紫外線硬化樹脂と無機物からなる粉末の混
合物、5……記録膜との接着性の良い樹脂、6……硬度
の硬い樹脂、7……熱硬化樹脂あるいは嫌気性樹脂、8
……スタンパ、9……紫外線、10……回転台。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (a) is a cross-sectional view of a magneto-optical disk structure of the present invention, and FIG. 1 (b) shows hardness corresponding to a position in a thickness direction of a protective film. is there. FIG. 2 is a cross-sectional view showing a first embodiment of the present invention, and FIG. 3 is a cross-sectional view showing a step of forming a magneto-optical disk protective film according to a second embodiment of the present invention. FIG. 4 is a sectional view showing a magneto-optical disc structure according to a third embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Base, 2 ... Recording film, 3 ... Protective film (single / multilayer structure), 4 ... Mixture of powder composed of an ultraviolet curable resin and an inorganic substance, 5 ... Resin having good adhesion to the recording film, 6: Hard resin, 7: Thermosetting resin or anaerobic resin, 8
…… Stamper, 9… Ultraviolet, 10… Turn table.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 安斎 由美子 東京都国分寺市東恋ケ窪1丁目280番地 株式会社日立製作所中央研究所内 (56)参考文献 特開 昭63−302447(JP,A) ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yumiko Ansai 1-280 Higashi Koigakubo, Kokubunji-shi, Tokyo Inside Central Research Laboratory, Hitachi, Ltd. (56) References JP-A-63-302447 (JP, A)
Claims (3)
を覆う単層又は多層の樹脂膜を有する光磁気ディスクに
おいて、上記樹脂膜の上記記録膜に接する第1の面より
その反対側の第2の面の硬度が大であり、該第2の面側
の樹脂には無機物が混入してなることを特徴とする光磁
気ディスク。1. A magneto-optical disk having a single-layer or multilayer resin film on a substrate having a recording film and covering the surface of the recording film, opposite to the first surface of the resin film in contact with the recording film. A second surface on the side having a high hardness, wherein the resin on the second surface is mixed with an inorganic material.
と、光磁気ディスク表面に露出する第2の層を有し、該
第2の層を構成する樹脂には無機物の粉末が混入してい
ることを特徴とする請求項1記載の光磁気ディスク。2. The resin film has a first layer in contact with the recording film and a second layer exposed on the surface of the magneto-optical disk, and the resin constituting the second layer contains an inorganic powder. 2. The magneto-optical disk according to claim 1, wherein the magneto-optical disk is mixed.
物,窒化物,もしくは炭化物の粉末としたことを特徴と
する請求項1または2記載の光磁気ディスク。3. The magneto-optical disk according to claim 1, wherein said inorganic substance is an oxide, nitride, or carbide powder of metal or silicon.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62327137A JP2619450B2 (en) | 1987-12-25 | 1987-12-25 | Magneto-optical disk |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62327137A JP2619450B2 (en) | 1987-12-25 | 1987-12-25 | Magneto-optical disk |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01171139A JPH01171139A (en) | 1989-07-06 |
JP2619450B2 true JP2619450B2 (en) | 1997-06-11 |
Family
ID=18195727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62327137A Expired - Lifetime JP2619450B2 (en) | 1987-12-25 | 1987-12-25 | Magneto-optical disk |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2619450B2 (en) |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63302447A (en) * | 1987-06-03 | 1988-12-09 | Teijin Ltd | Magneto-optical recording medium |
-
1987
- 1987-12-25 JP JP62327137A patent/JP2619450B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH01171139A (en) | 1989-07-06 |
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