JPH0240149A - Optical recording medium - Google Patents
Optical recording mediumInfo
- Publication number
- JPH0240149A JPH0240149A JP63188417A JP18841788A JPH0240149A JP H0240149 A JPH0240149 A JP H0240149A JP 63188417 A JP63188417 A JP 63188417A JP 18841788 A JP18841788 A JP 18841788A JP H0240149 A JPH0240149 A JP H0240149A
- Authority
- JP
- Japan
- Prior art keywords
- film
- protective film
- sliding
- recording medium
- resin
- 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.)
- Granted
Links
- 230000003287 optical effect Effects 0.000 title claims description 6
- 230000001681 protective effect Effects 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 20
- 229920005989 resin Polymers 0.000 claims abstract description 20
- 239000000314 lubricant Substances 0.000 claims abstract description 15
- 239000000945 filler Substances 0.000 claims abstract description 5
- 150000004767 nitrides Chemical class 0.000 claims abstract description 5
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 5
- 229930195729 fatty acid Natural products 0.000 claims description 5
- 239000000194 fatty acid Substances 0.000 claims description 5
- -1 fatty acid ester Chemical class 0.000 claims description 4
- 150000004665 fatty acids Chemical class 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229920002545 silicone oil Polymers 0.000 claims 1
- 239000010408 film Substances 0.000 abstract description 35
- 239000000758 substrate Substances 0.000 abstract description 11
- 239000012788 optical film Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract description 2
- 239000007787 solid Substances 0.000 abstract description 2
- 238000003848 UV Light-Curing Methods 0.000 abstract 3
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000001723 curing Methods 0.000 abstract 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 abstract 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
Landscapes
- Thermal Transfer Or Thermal Recording In General (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〕
本発明は光ディスクに係り、特に重ね書き（オーバーラ
イド）ができる光磁気ディスクに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an optical disk, and particularly to a magneto-optical disk that allows overwriting.
オーバーライドできる光磁気ディスクは第１図に示すよ
うな構造になっている。磁気ヘッド７と光磁気膜３との
間隔が狭いので耐摺動保護膜５が使用されている。従来
はこの耐摺動保護膜５として表面硬度の高い紫外線硬化
樹脂、あるいはこれに無機系のフィラーを分散させたも
のを使用してきた。A magneto-optical disk that can be overridden has a structure as shown in FIG. Since the distance between the magnetic head 7 and the magneto-optical film 3 is narrow, the anti-sliding protective film 5 is used. Conventionally, this anti-sliding protective film 5 has been made of an ultraviolet curable resin with high surface hardness, or a resin in which an inorganic filler is dispersed.
上記従来技術は耐摺動保護膜の潤滑性の点について配慮
されておらず、磁気ヘッドと耐摺動保護膜との摩擦力が
大きかった。そのために磁気ヘッドが光磁気ディスクの
回転開始時および停止時に耐摺動保護膜表面に接触した
場合、磁気ヘッドの動作不良や保護膜にキズ、クラック
などが発生し、光磁気膜を損傷させるという問題があっ
た。The above conventional technology does not take into account the lubricity of the anti-sliding protective film, and the frictional force between the magnetic head and the anti-sliding protective film is large. Therefore, if the magnetic head comes into contact with the surface of the anti-sliding protective film when the magneto-optical disk starts or stops rotating, the magnetic head may malfunction or the protective film may be scratched or cracked, damaging the magneto-optical film. There was a problem.
本発明の目的は、上記従来技術の問題を解決するために
、耐摺動保護膜に潤滑性を与えることにある。An object of the present invention is to provide a sliding protective film with lubricity in order to solve the problems of the prior art described above.
上記目的は、光磁気膜上の耐摺動保護膜として潤滑剤を
含む紫外線硬化樹脂、あるいは潤滑剤とフィラーを含む
紫外線硬化樹脂を用いることによって達成される。The above object is achieved by using an ultraviolet curing resin containing a lubricant or an ultraviolet curing resin containing a lubricant and a filler as the anti-sliding protective film on the magneto-optical film.
紫外線硬化樹脂（以下ＵＶ樹脂という）に溶解、または
混入させられた潤滑剤分子が、耐摺動保護膜表面に浸み
出し、適切な潤滑性を与えるので、磁気ヘッドの接触時
でもヘッドの動作は正常となり、また保護膜のクラック
やキズが発生することはなくなり、光磁気膜の保護効果
が増大する。Lubricant molecules dissolved or mixed in the ultraviolet curing resin (hereinafter referred to as UV resin) seep out onto the surface of the anti-sliding protective film and provide appropriate lubricity, ensuring head operation even when the magnetic head makes contact. becomes normal, cracks and scratches on the protective film no longer occur, and the protective effect of the magneto-optical film increases.
以下、本発明の一実施例を第１図により説明する。透明
基板１として５″ガラス基板を用い、これの表面に２Ｐ
法（ホトポリメリゼーション：ｐｈｏｔｏｐｏｌｙｍｅ
ｒｉｊａｔｊ、ｏｎ）により、案内溝や信号用ピットを
形成させた。このレプリカ基板上にスパッタリングによ
り誘導体膜２、光磁気膜３、誘電体膜４を順次積層させ
た。誘電体膜４は窒化物であり厚さは約０．１μｍであ
る。An embodiment of the present invention will be described below with reference to FIG. A 5" glass substrate is used as the transparent substrate 1, and 2P is placed on the surface of this.
photopolymerization method (photopolymerization)
guide grooves and signal pits were formed using rijatj, on). A dielectric film 2, a magneto-optical film 3, and a dielectric film 4 were sequentially laminated on this replica substrate by sputtering. The dielectric film 4 is made of nitride and has a thickness of about 0.1 μm.
この窒化膜４の上に耐摺動保護膜５を以下の方法で形成
させた。まずＵＶ樹脂材料はアクリル系であるが、硬化
後の表面硬度の高い材料を選択した。この液状ＵＶ樹脂
に潤滑剤として固形のステアリン酸エステルを約１．０
重量％添加し、十分攪拌させた。これを上述の記録層付
き基板上に回転塗布した後、紫外線を照射し硬化させた
。このようにして形成された耐摺動保護膜５の厚さは約
１０μｍであった。A sliding protection film 5 was formed on this nitride film 4 by the following method. First, the UV resin material is acrylic, and a material with high surface hardness after curing was selected. Approximately 1.0% of solid stearic acid ester is added to this liquid UV resin as a lubricant.
% by weight was added and thoroughly stirred. This was spin-coated onto the above-mentioned substrate with a recording layer, and then irradiated with ultraviolet rays to cure it. The thickness of the anti-sliding protective film 5 thus formed was about 10 μm.
つぎに摺動試験として回転台の上にセットされた記録媒
体表面に、半径３０ ｍ ｍの球面摺動子を一定荷重が
押え付けながら摺動させ、保護膜表面の粗さ、キズなど
を１＠察した。また、摺動開始時における摺動子と保護
膜表面との静止摩擦力を測定した。潤滑剤入り、保護膜
の静止摩擦力はＵＶ樹脂だけの場合と比較して数分の１
と小さくなつている。Next, as a sliding test, a spherical slider with a radius of 30 mm was slid on the surface of the recording medium set on a rotary table while a constant load was applied to check the roughness and scratches on the surface of the protective film. @I guessed it. In addition, the static friction force between the slider and the surface of the protective film at the start of sliding was measured. Contains lubricant, the static friction force of the protective film is a fraction of that of UV resin alone.
It's getting smaller.
また１０６回摺動後でも０．５μｍ以下のキズが認めら
れただけで実用的には問題とならない。実際に浮上型磁
気ヘッドを搭載した装置にかけて試験した結果も良好で
あった。Further, even after sliding 106 times, only scratches of 0.5 μm or less were observed, which does not pose a practical problem. The results of an actual test using a device equipped with a floating magnetic head were also good.
潤滑剤はＵＶ樹脂膜のなかに分子的に分散した状態、あ
るいは数１００人の塊として分散した状態で存在し、潤
滑分子が徐々に浸み出してきて潤滑性が保たれるものと
考えられる。It is thought that the lubricant exists in the UV resin film in a molecularly dispersed state or in a dispersed state in clusters of several hundred molecules, and that lubricant molecules gradually seep out to maintain lubricity. .
つぎに耐摺動性のより一層の向上は、アルミナなどのフ
ィラーをさらに添加した保護膜で達成される。アルミナ
は粒径約０．５μｍ￥Ｓ度は１０重量％以下である。潤
滑剤としては上記以外の高級脂肪酸、高級脂肪酸イミド
、およびこれらを部分的にフッ化させた化合物を用いて
も同等の性能の保護膜を得ることができた。透明基板が
プラスチックの場合でも同様に作製することができる。Next, further improvement in sliding resistance can be achieved by using a protective film to which a filler such as alumina is further added. The particle size of alumina is approximately 0.5 μm and the degree of S degree is 10% by weight or less. A protective film with equivalent performance could be obtained using higher fatty acids, higher fatty acid imides, and partially fluorinated compounds of these as lubricants. Even when the transparent substrate is made of plastic, it can be produced in the same way.
耐摺動保護膜の形成法としては回転塗布のほかにつぎの
ような方法でも良い。光磁気積層膜付基板の上に潤滑剤
を含む液状のＵＶ樹脂をのせ、その上から表面が平坦で
しかも紫外線を透過させる板を重ね合せＵＶ樹脂を拡げ
た後、紫外線を照射し、ＵＶ樹脂を硬化させた後に平坦
板をＵＶ樹脂膜との境界から剥離させる方法である。In addition to spin coating, the following method may be used to form the anti-sliding protective film. A liquid UV resin containing a lubricant is placed on a substrate with a magneto-optical laminated film, and a plate with a flat surface that transmits ultraviolet rays is placed on top of it to spread the UV resin. This is a method in which the flat plate is peeled off from the boundary with the UV resin film after curing.
本発明によれば、表面硬度が大でしかも潤滑性のある耐
摺動保護膜が得られるので、磁気ヘッドによる摺動回数
が１０６回以上でも問題は発生しない、つまり信頼性の
高い磁界変調型光磁気媒体を作製することができる。ま
た紫外線硬化樹脂を用いているので生産性の点でも優れ
ている。According to the present invention, since an anti-sliding protective film with high surface hardness and lubricity can be obtained, no problem occurs even when the magnetic head is slid over 106 times. In other words, a highly reliable magnetic field modulation type Magneto-optical media can be created. Furthermore, since it uses ultraviolet curing resin, it is also excellent in terms of productivity.
第１図は、本発明のオーバーライド用光磁気媒体の断面
図である。
１・・・基板、２・・・誘電体膜、３・・・光磁気膜、
４・・・誘電体膜、５・・・耐摺動保護膜、６・・・レ
ーザビーム、７・・・磁気ヘッド。FIG. 1 is a sectional view of a magneto-optical medium for override according to the present invention. DESCRIPTION OF SYMBOLS 1... Substrate, 2... Dielectric film, 3... Magneto-optical film,
4... Dielectric film, 5... Anti-sliding protective film, 6... Laser beam, 7... Magnetic head.
Claims (1)
た紫外線硬化樹脂、または潤滑剤とフィラーを溶解混入
させた紫外線硬化樹脂から形成される耐摺動保護膜を有
してなることを特徴とする光記録媒体。 ２、耐摺動膜において潤滑剤がシリコンオイル高級脂肪
酸、高級脂肪酸エステル、高級脂肪酸アミド、およびこ
れらが部分的にフッ素化された化合物等を使用したこと
を特徴とする特許請求の範囲第１項記載の光記録媒体。 ３、耐摺動膜において、フィラーが、ＳｉＯ＿２、Ａｌ
＿２Ｏ＿３、Ｃｒ＿２Ｏ＿３、ＺｒＯ＿２等の酸化物、
Ｓｉ＿３Ｎ＿４、ＢＮ等の窒化物、ＳｉＣ等の炭化物で
あることを特徴とする特許請求の範囲第１項記載の光記
録媒体。[Claims] 1. A sliding-resistant protective film formed from an ultraviolet curable resin in which a lubricant is dissolved or mixed, or an ultraviolet curable resin in which a lubricant and a filler are dissolved and mixed, on a magneto-optical laminated film. An optical recording medium comprising: 2. Claim 1, characterized in that in the anti-sliding film, the lubricant is silicone oil, higher fatty acid, higher fatty acid ester, higher fatty acid amide, partially fluorinated compound of these, or the like. The optical recording medium described. 3. In the anti-sliding film, the filler is SiO_2, Al
Oxides such as _2O_3, Cr_2O_3, ZrO_2,
The optical recording medium according to claim 1, wherein the optical recording medium is a nitride such as Si_3N_4 or BN, or a carbide such as SiC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63188417A JP2804045B2 (en) | 1988-07-29 | 1988-07-29 | Optical recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63188417A JP2804045B2 (en) | 1988-07-29 | 1988-07-29 | Optical recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0240149A true JPH0240149A (en) | 1990-02-08 |
| JP2804045B2 JP2804045B2 (en) | 1998-09-24 |
Family
ID=16223299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63188417A Expired - Fee Related JP2804045B2 (en) | 1988-07-29 | 1988-07-29 | Optical recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2804045B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03219448A (en) * | 1990-01-24 | 1991-09-26 | Matsushita Electric Ind Co Ltd | Magneto-optical disk and disk cartridge |
| EP0464674A2 (en) * | 1990-06-29 | 1992-01-08 | Sony Corporation | Magneto-optical disc |
| EP0574930A2 (en) * | 1992-06-19 | 1993-12-22 | TDK Corporation | Magneto-optical disc |
| US5279877A (en) * | 1991-09-06 | 1994-01-18 | Tdk Corporation | Magneto optical disc |
| US5604005A (en) * | 1993-10-19 | 1997-02-18 | Tdk Corporation | Magneto-optical disc |
| US6171673B1 (en) | 1998-06-01 | 2001-01-09 | Sony Chemicals Corp. | Compositions for protective films and optical recording media |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01277348A (en) * | 1988-04-28 | 1989-11-07 | Hitachi Maxell Ltd | Magneto-optical recording medium and its production |
-
1988
- 1988-07-29 JP JP63188417A patent/JP2804045B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01277348A (en) * | 1988-04-28 | 1989-11-07 | Hitachi Maxell Ltd | Magneto-optical recording medium and its production |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03219448A (en) * | 1990-01-24 | 1991-09-26 | Matsushita Electric Ind Co Ltd | Magneto-optical disk and disk cartridge |
| EP0464674A2 (en) * | 1990-06-29 | 1992-01-08 | Sony Corporation | Magneto-optical disc |
| US5506023A (en) * | 1990-06-29 | 1996-04-09 | Sony Corporation | Magneto-optical disc |
| EP0756275A1 (en) * | 1990-06-29 | 1997-01-29 | Sony Corporation | Magneto-optical disc recording/reproducing system |
| US5279877A (en) * | 1991-09-06 | 1994-01-18 | Tdk Corporation | Magneto optical disc |
| EP0574930A2 (en) * | 1992-06-19 | 1993-12-22 | TDK Corporation | Magneto-optical disc |
| EP0574930A3 (en) * | 1992-06-19 | 1994-03-16 | Tdk Corp | |
| US5578355A (en) * | 1992-06-19 | 1996-11-26 | Tdk Corporation | Magneto-optical disk having a microporous protective coating containing a lubricant |
| US5604005A (en) * | 1993-10-19 | 1997-02-18 | Tdk Corporation | Magneto-optical disc |
| US6171673B1 (en) | 1998-06-01 | 2001-01-09 | Sony Chemicals Corp. | Compositions for protective films and optical recording media |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2804045B2 (en) | 1998-09-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |