JP2550084B2 - Light disk - Google Patents
Light diskInfo
- Publication number
- JP2550084B2 JP2550084B2 JP62183277A JP18327787A JP2550084B2 JP 2550084 B2 JP2550084 B2 JP 2550084B2 JP 62183277 A JP62183277 A JP 62183277A JP 18327787 A JP18327787 A JP 18327787A JP 2550084 B2 JP2550084 B2 JP 2550084B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- curable resin
- inorganic material
- mixture
- recording
- 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
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
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は光デイスクに係り、特に記録膜上の保護を強
化させるのに好適な保護層に関する。The present invention relates to an optical disc, and more particularly to a protective layer suitable for enhancing protection on a recording film.
近年、浮上磁気ヘツドを用いた磁界変調法によりオー
バーライト（重ね書き）を行なう研究がなされている。
以下、第２図により磁界変調法によるオーバーライトの
一例を説明する。In recent years, research has been conducted to perform overwriting by a magnetic field modulation method using a levitating magnetic head.
An example of overwrite by the magnetic field modulation method will be described below with reference to FIG.
６は磁気ヘツド、７はレーザ光を絞り込むレンズ、８
はレーザ光を示す。デイスクの構成は、基板９上にSiN
エンハンス膜10、TbFeCo記録膜11、SiN保護層12および
紫外線硬化樹脂保護膜13を順に形成したものである。6 is a magnetic head, 7 is a lens for narrowing down laser light, 8
Indicates laser light. The disk structure is SiN on the substrate 9.
The enhancement film 10, the TbFeCo recording film 11, the SiN protective layer 12, and the ultraviolet curable resin protective film 13 are sequentially formed.
保護膜の上面に磁気ヘツド６を配置し、記録信号に応
じた磁界を光デイスクに与えている。さらに基板側に光
学系を配置し、記録膜を加熱したり、信号再生に使用す
る。ここで、記録する場合は、光エネルギーで記録膜を
加熱し、磁化を消滅させ、信号に応じて、上向き下向き
の磁界を磁気ヘツドから発生させ、記録膜が冷却させる
際に、光デイスクに信号磁界の向きに磁化分布を形成す
る。再生の場合は、レーザ光を照射し、カー効果による
偏光面の回転を、光の強弱信号として得ることができ
る。A magnetic head 6 is arranged on the upper surface of the protective film, and a magnetic field corresponding to a recording signal is applied to the optical disc. Further, an optical system is arranged on the substrate side to heat the recording film or to use for signal reproduction. Here, in the case of recording, the recording film is heated by light energy to extinguish the magnetization, an upward and downward magnetic field is generated from the magnetic head according to the signal, and when the recording film is cooled, the signal is transmitted to the optical disk. A magnetization distribution is formed in the direction of the magnetic field. In the case of reproduction, it is possible to irradiate a laser beam and obtain the rotation of the polarization plane due to the Kerr effect as a light intensity signal.
尚、この種の装置および方法については、例えば日経
エレクトロニクス1987年４月20日号第94頁から第96頁に
おいて論じられている。The apparatus and method of this type are discussed, for example, in Nikkei Electronics, April 20, 1987, pages 94 to 96.
上記従来技術は、光磁気デイスクの記録方法であるオ
ーバーライト方式において、磁気ヘツドが保護層に接触
するということを考えると、表面硬度の点で問題があつ
た。The above-mentioned prior art has a problem in surface hardness in consideration of the fact that the magnetic head comes into contact with the protective layer in the overwrite method which is a recording method of a magneto-optical disk.
本発明の目的は、表面硬度が高い保護層を有する光デ
イスクを提供することにある。An object of the present invention is to provide an optical disc having a protective layer with high surface hardness.
上記目的は、紫外線硬化樹脂と無機物の混合体から成
る保護層を設けることにより達成される。The above object is achieved by providing a protective layer made of a mixture of an ultraviolet curable resin and an inorganic material.
上記無機物としては、SiO2,Al2O3,Cr2O3,ZrO2等の酸
化物、Si3N4,BN等の窒化物,SiC等の炭化物，グラフアイ
ト、あるいはこれらの混合物が好ましく、その中でもAl
2O3は硬くて粒径がそろつていることから特に好まし
い。As the inorganic material, SiO 2 , Al 2 O 3 , Cr 2 O 3 , oxides such as ZrO 2 , Si 3 N 4 , nitride such as BN, carbide such as SiC, graphite, or a mixture thereof is preferable. , Among them Al
2 O 3 is particularly preferable because it is hard and has a uniform particle size.
紫外線硬化樹脂と無機物の混合体から成る保護層は、
無機物の硬度の高さによつて保護層全体としての硬度が
高くなる。そのため、磁界変調方式において、磁気ヘツ
ドによるオーバーライトを行う上で、ヘツドによる記録
膜への損傷はなく、安定な記録・再生を行なうことがで
き、品質の良い信号を得ることが可能な光磁気デイスク
を作製することができる。The protective layer consisting of a mixture of UV curable resin and inorganic material,
The hardness of the entire protective layer increases due to the high hardness of the inorganic material. Therefore, in the magnetic field modulation method, when overwriting by a magnetic head, there is no damage to the recording film by the head, stable recording / reproducing can be performed, and a magneto-optical device capable of obtaining a high-quality signal can be obtained. Disks can be made.
以下、本発明の一実施例を第１図を用いて説明する。
無機物としてアルミナ（Al2O3）を使用する。Hereinafter, an embodiment of the present invention will be described with reference to FIG.
Alumina (Al 2 O 3 ) is used as an inorganic substance.
凹凸パターン上に記録膜５を有する円板状の基盤１の
上に、あらかじめ調合しておいた紫外線硬化樹脂とアル
ミナの混合物２を円状に塗布し、その上に表面が平坦な
スタンパ３を重ね合わせ、その上から10kg以上の加重を
基盤全体にかけ紫外線硬化樹脂とアルミナの混合物を押
し拡げる。この後、紫外線４を照射して、先の紫外線硬
化樹脂とアルミナの混合物２を硬化させ、先のスタンパ
３を取り去ると、基盤の記録膜５の上には先の紫外線硬
化樹脂とアルミナの混合物２による保護膜が形成され
る。尚、無機物の例としては、SiO2,Cr2O3,ZrO2等の酸
化物,Si3N4,BN等の窒化物,SiC等の炭化物、クラフアイ
トあるいはこれらの混合物等があげられる。特にグラフ
アイトについては潤滑剤の効果もでてくる。On a disk-shaped base 1 having a recording film 5 on the concavo-convex pattern, a mixture 2 of a UV curable resin and alumina prepared in advance is applied in a circular shape, and a stamper 3 having a flat surface is applied thereon. Overlap and apply a weight of 10 kg or more from above to spread the mixture of UV curable resin and alumina on the entire substrate. After this, the ultraviolet ray 4 is irradiated to cure the mixture 2 of the ultraviolet curing resin and alumina, and the stamper 3 is removed. Then, the mixture of the ultraviolet curing resin and alumina is formed on the base recording film 5. 2 forms a protective film. Examples of inorganic substances include oxides such as SiO 2 , Cr 2 O 3 and ZrO 2 , nitrides such as Si 3 N 4 and BN, carbides such as SiC, and kraftite or a mixture thereof. Especially for graphite, the effect of the lubricant also comes out.
又、紫外線硬化樹脂と無機物との混合物を塗布する方
法として、スピンナーによるスピン塗布でも、保護膜作
製は可能である。Further, as a method of applying a mixture of an ultraviolet curable resin and an inorganic material, spin coating with a spinner can also be used to produce a protective film.
次に、第１表を用いて紫外線硬化樹脂に対する無機物
の混合比について説明する。Next, the mixing ratio of the inorganic substance to the ultraviolet curable resin will be described with reference to Table 1.
紫外線硬化樹脂に無機物の粉末を10％〜70％混入した
ものを７種類用意し、前記要領で保護膜を作製して表面
荒さと保護膜強度を調べた。Seven kinds of UV-curing resin mixed with 10% to 70% of inorganic powder were prepared, a protective film was prepared in the same manner as described above, and surface roughness and protective film strength were examined.
混合比が60％以上となると保護膜表面に荒れが生じ
た。また、保護膜の強度の観点からは10％添加のものは
他に比べてやや劣つていた。このことから、混合比は20
％以上50％以下程度の範囲が好ましい。 When the mixing ratio was 60% or more, the surface of the protective film was roughened. Also, from the viewpoint of the strength of the protective film, the one with 10% addition was slightly inferior to the others. From this, the mixing ratio is 20
The range of about 50% to 50% is preferable.
本発明によれば、表面硬度の高い均一な保護膜が作製
でき、磁界変調オーバーライト方式等においても、記録
膜を損うことなく安定した記録・再生が可能となり、記
録膜の寿命を延ばすことができる。According to the present invention, a uniform protective film having a high surface hardness can be produced, and stable recording / reproducing can be performed without damaging the recording film even in the magnetic field modulation overwrite method, etc., and the life of the recording film can be extended. You can
第１図は、本発明の光デイスクの作製工程を示す断面
図、第２図は、磁界変調方式によるオーバーライトの説
明図である。 １……基盤、２……紫外線硬化樹脂と無機物の粉末との
混合物、３……スタンパ、４……紫外線、５……記録
膜、６……磁気ヘツド、７……レンズ、８……レーザ
光、９……基板、10……エンハンス膜、11……記録膜、
12,13……保護膜。FIG. 1 is a cross-sectional view showing a manufacturing process of an optical disk of the present invention, and FIG. 2 is an explanatory view of overwrite by a magnetic field modulation method. 1 ... Substrate, 2 ... Mixture of UV curable resin and inorganic powder, 3 ... Stamper, 4 ... UV, 5 ... Recording film, 6 ... Magnetic head, 7 ... Lens, 8 ... Laser Light, 9 ... Substrate, 10 ... Enhance film, 11 ... Recording film,
12,13 …… Protective film.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 堀篭 信吉 東京都国分寺市東恋ヶ窪１丁目280番地 株式会社日立製作所中央研究所内 (72)発明者 福家 元 東京都国分寺市東恋ヶ窪１丁目280番地 株式会社日立製作所中央研究所内 (72)発明者 尾島 正啓 東京都国分寺市東恋ヶ窪１丁目280番地 株式会社日立製作所中央研究所内 (72)発明者 仲尾 武司 東京都国分寺市東恋ヶ窪１丁目280番地 株式会社日立製作所中央研究所内 (72)発明者 太田 憲雄 東京都国分寺市東恋ヶ窪１丁目280番地 株式会社日立製作所中央研究所内 (72)発明者 川久保 洋一 東京都国分寺市東恋ヶ窪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63−69048（ＪＰ，Ａ) 特開 昭63−69044（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinkichi Hori 1-280, Higashi Koigakubo, Kokubunji City, Tokyo Metropolitan Institute of Hitachi, Ltd. (72) Inventor Fukuya Gen 1-280, Higashi Koigakubo, Kokubunji City, Tokyo Hitachi, Ltd. Central Research Laboratory (72) Inventor Masahiro Ojima 1-280 Higashi Koigakubo, Kokubunji, Tokyo Central Research Laboratory, Hitachi, Ltd. (72) Inventor Takeshi Nakao 1-280 Higashi Koigakubo, Kokubunji, Tokyo Hitachi Central Research Institute ( 72) Inventor Norio Ota 1-280, Higashi Koigakubo, Kokubunji, Tokyo, Central Research Laboratory, Hitachi, Ltd. (72) Inventor, Yoichi Kawakubo 1-280, Higashi Koigakubo, Kokubunji, Tokyo (56) References, Central Research Laboratory, Hitachi, Ltd. (56) References JP 63-69048 (JP, A ) JP-A-63-69044 (JP, A)
Claims (3)
面に直接または中間膜を介して、紫外線硬化樹脂と無機
物の混合体からなる保護膜を形成し、上記無機物はAl2O
3,SiO2,Cr2O3,ZrO2,Si3N4,BN,SiC,および、グラファイ
トから選ばれる少なくとも１種を含むことを特徴とする
光ディスク。1. A protective film made of a mixture of an ultraviolet curable resin and an inorganic material is formed on the surface of the recording film opposite to the substrate as viewed from the recording film directly or through an intermediate film, and the inorganic material is Al 2 O
An optical disk comprising at least one selected from 3 , 3 , SiO 2 , Cr 2 O 3 , ZrO 2 , Si 3 N 4 , BN, SiC, and graphite.
に対して重量比で20％以上50％以下であることを特徴と
する特許請求の範囲第１項記載の光ディスク。2. The optical disk according to claim 1, wherein the amount of the inorganic material mixed is 20% or more and 50% or less by weight of the ultraviolet curable resin.
る特許請求の範囲第１項または第２項記載の光ディス
ク。3. The optical disc according to claim 1, wherein the intermediate film is made of SiN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62183277A JP2550084B2 (en) | 1987-07-24 | 1987-07-24 | Light disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62183277A JP2550084B2 (en) | 1987-07-24 | 1987-07-24 | Light disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6430041A JPS6430041A (en) | 1989-01-31 |
| JP2550084B2 true JP2550084B2 (en) | 1996-10-30 |
Family
ID=16132841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62183277A Expired - Lifetime JP2550084B2 (en) | 1987-07-24 | 1987-07-24 | Light disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2550084B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2838281B2 (en) * | 1988-12-07 | 1998-12-16 | 京セラ株式会社 | Magneto-optical recording element |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0754591B2 (en) * | 1986-09-11 | 1995-06-07 | セイコーエプソン株式会社 | Optical recording medium |
| JPH07105069B2 (en) * | 1986-09-11 | 1995-11-13 | セイコーエプソン株式会社 | Optical recording medium |
-
1987
- 1987-07-24 JP JP62183277A patent/JP2550084B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6430041A (en) | 1989-01-31 |
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