JPS63257915A - Magnetic disk - Google Patents
Magnetic diskInfo
- Publication number
- JPS63257915A JPS63257915A JP9084687A JP9084687A JPS63257915A JP S63257915 A JPS63257915 A JP S63257915A JP 9084687 A JP9084687 A JP 9084687A JP 9084687 A JP9084687 A JP 9084687A JP S63257915 A JPS63257915 A JP S63257915A
- Authority
- JP
- Japan
- Prior art keywords
- film
- magnetic
- magnetic disk
- thin film
- disk
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 34
- 230000001681 protective effect Effects 0.000 claims abstract description 33
- 238000007747 plating Methods 0.000 claims abstract description 26
- 239000000758 substrate Substances 0.000 claims abstract description 11
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000010408 film Substances 0.000 claims description 53
- 239000010409 thin film Substances 0.000 claims description 28
- 239000000428 dust Substances 0.000 abstract description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 abstract 2
- 229910052759 nickel Inorganic materials 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000011109 contamination Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、カーボン保護膜を形成した磁気ディスクに関
し、特に、磁性薄膜の表面にカーボン保護膜を形成した
磁気ディスクにおいて帯電を防止する技術に関するもの
である。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic disk on which a carbon protective film is formed, and particularly relates to a technique for preventing charging in a magnetic disk on which a carbon protective film is formed on the surface of a magnetic thin film. It is something.
従来、磁気ディスクの帯電を防止する技術に関しては、
特開昭５９−１８０８２８号公報に記載のものがある。Conventionally, regarding the technology to prevent charging of magnetic disks,
There is one described in JP-A-59-180828.
これは、磁気ディスクの構造として、γ型三酸化二鉄（
γ−ＦｅＱＯｓ）の磁性薄膜を用いたもので、γ型三酸
化二鉄の磁性薄膜と電気絶縁性無機材料からなるディス
ク基板との間に導電性薄膜を介在させたものである。こ
こでは、導電性薄膜を介在させることにより、基板とし
て硬度の高い材料を用いると共に、ディスク表面に帯電
した電荷が導電性薄膜を経て放電されるようになってお
り、磁気ディスクの帯電を防止する構成となっている。This is because the structure of the magnetic disk is γ-type diiron trioxide (
A conductive thin film is interposed between a magnetic thin film of γ-type diiron trioxide and a disk substrate made of an electrically insulating inorganic material. Here, by interposing a conductive thin film, a material with high hardness is used as the substrate, and the electric charge accumulated on the disk surface is discharged through the conductive thin film, thereby preventing the magnetic disk from being charged. The structure is as follows.
しかしながら、近年一般的に使用されているγ型三酸化
二鉄の磁性薄膜の表面に保護膜のカーボン薄膜を設けた
磁気ディスクは、コーティングした磁気ディスクに比べ
て、ヘッドの汚れが多いことが実験結果から解った。こ
れは、カーボン保護膜を設けた磁気ディスクにおいて。However, experiments have shown that magnetic disks that have been commonly used in recent years, which have a protective carbon thin film on the surface of a γ-type diiron trioxide magnetic thin film, have more head contamination than coated magnetic disks. I understood from the results. This applies to magnetic disks with a carbon protective film.
カーボン保護膜を設けた場合の帯電防止については配慮
されておらず、カーボン保護膜の表面に塵埃が付着し易
くなっているためである。したがって、このような磁気
ディスクを用いた磁気ディスク装置においては、コンタ
クト・スタート・ストップ（ＣＳＳ）時もしくはシーク
時、磁気へラドスライダ面に塵埃が堆積してヘッドの浮
」二特性を悪化させるために、摺動事故に至るという問
題点があった。This is because no consideration is given to preventing static electricity when a carbon protective film is provided, and dust tends to adhere to the surface of the carbon protective film. Therefore, in a magnetic disk device using such a magnetic disk, during contact start/stop (CSS) or seek, dust accumulates on the magnetic slider surface and deteriorates the floating characteristics of the head. However, there was a problem in that it could lead to sliding accidents.
本発明は、前記問題点を解決するためになされたもので
ある。The present invention has been made to solve the above problems.
本発明の目的は、γ型三酸化二鉄の磁性薄膜の表面にカ
ーボン保護膜を設けた磁気ディスクにおいて、カーボン
保護膜の帯電を防止し、カーボン保護膜の表面に塵埃が
付着することを防止する技術を提供することにある。The purpose of the present invention is to prevent charging of the carbon protective film and prevent dust from adhering to the surface of the carbon protective film in a magnetic disk in which a carbon protective film is provided on the surface of a magnetic thin film of γ-type diiron trioxide. The goal is to provide technology that will
本発明の前記ならびにその他の目的と新規な特徴は、本
明細書の記述及び添付図面によって明らかになるであろ
う。The above and other objects and novel features of the present invention will become apparent from the description of this specification and the accompanying drawings.
〔問題点を解決するための手段〕
本願において開示される発明のうち代表的なものの概要
を簡単に説明すれば、下記のとおりである６
すなわち、本発明においては磁気ディスクの構造として
、非磁性のディスク基板の全表面に導電性メッキ膜を設
け、該導電性メッキ膜の表面にγ型三酸化二鉄の磁性薄
膜を設け、さらに前記磁性薄膜を覆うような状態でカー
ボン保護膜を設けた磁気ディスクにおいて、該磁気ディ
スクの端部で前記導電性メッキ膜が露出する状態の磁性
薄膜未形成部を設け、該磁性薄膜未形成部で前記カーボ
ン保護膜と導電性メッキ膜としたものである。[Means for Solving the Problems] A brief summary of typical inventions disclosed in this application is as follows.6 In other words, in the present invention, the structure of the magnetic disk is A conductive plating film was provided on the entire surface of the disk substrate, a magnetic thin film of γ-type diiron trioxide was provided on the surface of the conductive plating film, and a carbon protective film was further provided to cover the magnetic thin film. In the magnetic disk, a portion where the magnetic thin film is not formed is provided at an end of the magnetic disk where the conductive plating film is exposed, and the carbon protective film and the conductive plating film are formed in the portion where the magnetic thin film is not formed. .
前記手段によれば、磁気ディスクの端部で導電性メッキ
膜が露出する状態の磁性薄膜未形成部が設けられ、この
磁性薄膜未形成部でカーボン保護膜と導電性メッキ膜と
が接触する構造となっているので、磁気ディスク表面の
カーボン保護膜に帯電した電荷は、磁気ディスクの端部
でカーボン保護膜と接触された導電性メッキ膜を通し、
ディスク基板を介してディスク装置の放電路を通して大
地に放電される。これにより。According to the above means, there is provided a portion where the magnetic thin film is not formed, in which the conductive plating film is exposed, at the end of the magnetic disk, and the carbon protective film and the conductive plating film are in contact with each other in this portion where the magnetic thin film is not formed. Therefore, the electric charge on the carbon protective film on the surface of the magnetic disk passes through the conductive plating film that is in contact with the carbon protective film at the edge of the magnetic disk.
It is discharged to the ground through the discharge path of the disk device via the disk substrate. Due to this.
磁気ディスク表面のカーボン保護膜に電荷が帯電しなく
なるので、カーボン保護膜表面に塵埃が付着することを
防止することができる。Since the carbon protective film on the surface of the magnetic disk is no longer charged with electric charge, it is possible to prevent dust from adhering to the surface of the carbon protective film.
以下１本発明の一実施例を図を用いて具体的に説明する
。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the drawings.
第１図は１本発明の一実施例の磁気ディスクの構造を示
す要部の部分断面図である。FIG. 1 is a partial sectional view of essential parts showing the structure of a magnetic disk according to an embodiment of the present invention.
本実施例の磁気ディスクは、第１図に示すように、非磁
性のディスク基板となるアルミ基板１の全表面に導電性
のニッケル・リン（Ｎｉ−Ｐ）メッキ膜２を形成し、こ
のメッキ膜２の表面に、酸化反応スパッタリングおよび
熱処理でγ型三酸化二鉄（γ−Ｆｅ２０ｓ）の磁性薄膜
３を形成する。このとき、ディスク端部で導電性メッキ
膜２が露出する状態で、磁性薄膜未形成部５が残されて
、磁性薄膜３が形成される。そして、さらに前記磁性薄
膜３を覆うような状態でカーボン保護膜４が形成される
。すなわち、磁性薄膜３の全表面部分と共にディスクの
端部で露出する状態の導電性メッキ膜２と磁性薄膜未形
成部５をオーバラップさせて、カーボン保護膜４が形成
される。このため、ディスクの端部の磁性薄膜未形成部
５で露出した前記導電性メッキ膜２とカーボン保護膜４
とが接触する構造となっている。As shown in FIG. 1, the magnetic disk of this embodiment has a conductive nickel-phosphorous (Ni-P) plating film 2 formed on the entire surface of an aluminum substrate 1, which serves as a non-magnetic disk substrate. A magnetic thin film 3 of γ-type diiron trioxide (γ-Fe20s) is formed on the surface of the film 2 by oxidation reaction sputtering and heat treatment. At this time, the conductive plating film 2 is exposed at the end of the disk, and the magnetic thin film 3 is formed with the magnetic thin film non-formed portion 5 remaining. Then, a carbon protective film 4 is further formed to cover the magnetic thin film 3. That is, the carbon protective film 4 is formed by overlapping the conductive plating film 2 exposed at the edge of the disk with the entire surface of the magnetic thin film 3 and the portion 5 where the magnetic thin film is not formed. Therefore, the conductive plating film 2 and carbon protective film 4 exposed at the magnetic thin film-free portion 5 at the edge of the disk are removed.
The structure is such that they are in contact with each other.
このように構成することにより、磁気ディスクの端部で
導電性メッキ膜２が露出する状態の磁性薄膜未形成部５
が設けられ、この磁性薄膜未形成部５でカーボン保護膜
４と導電性メッキ膜２とが接触する構造となっているの
で、磁気ディスク表面のカーボン保護１１１４に帯電し
た電荷は、磁気ディスクの端部でカーボン保護膜４と接
触された導電性メッキ膜２を通し、アルミ基板１を介し
てディスク装置の放電路を通して大地に放電される。こ
れにより、磁気ディスク表面のカーボン保護膜４に電荷
が帯電しなくなるので、カーボン保護膜４の表面に塵埃
が付着することを防止することができる。With this configuration, the magnetic thin film-free portion 5 where the conductive plating film 2 is exposed at the end of the magnetic disk is formed.
is provided, and the structure is such that the carbon protective film 4 and the conductive plating film 2 are in contact with each other in the area 5 where the magnetic thin film is not formed, so that the electric charge accumulated on the carbon protective film 1114 on the surface of the magnetic disk is transferred to the edge of the magnetic disk. The electric current is discharged to the ground through the conductive plating film 2 which is in contact with the carbon protective film 4 at the bottom, through the aluminum substrate 1, and through the discharge path of the disk device. As a result, the carbon protective film 4 on the surface of the magnetic disk is no longer charged with electric charge, so that it is possible to prevent dust from adhering to the surface of the carbon protective film 4.
なお、この磁性薄膜未形成部５は、ディスク端部の内周
部または外周部の磁性薄膜を形成していない部分を利用
するため、膜形成装置の大幅な変更を必要とすることな
く製造できる。The magnetic thin film-unformed portion 5 can be manufactured without requiring major changes to the film forming apparatus, since it utilizes the inner or outer peripheral portion of the disk end where no magnetic thin film is formed. .
以上１本発明を実施例とともに具体的に説明したが、本
発明は、その要旨を逸脱しない範囲において種々変更可
能であることは言うまでもない。Although the present invention has been specifically explained above along with examples, it goes without saying that the present invention can be modified in various ways without departing from the gist thereof.
以上、説明したように、本発明によれば、磁気ディスク
の端部で導電性メッキ膜が露出する状態の磁性薄膜未形
成部が設けられ、この磁性薄膜未形成部でカーボン保護
膜と導電性メッキ膜とが接触する構造となっているので
、磁気ディスク表面のカーボン保護膜に帯電した電荷は
。As described above, according to the present invention, a portion where a magnetic thin film is not formed is provided at the end of the magnetic disk where a conductive plating film is exposed, and a carbon protective film and a conductive layer are formed in this portion where a magnetic thin film is not formed. Since the structure is such that it contacts the plating film, the electric charge accumulated on the carbon protective film on the surface of the magnetic disk.
磁気ディスクの端部でカーボン保護膜と接触された導電
性メッキ膜を通し、ディスク基板を介してディスク装置
の放電路を通して大地に放電される。これにより、磁気
ディスク表面のカーボン保護膜に電荷が帯電しなくなる
ので、カーボン保護膜表面に塵埃が付着することを防止
することができる。The electric current is discharged to the ground through the conductive plating film that is in contact with the carbon protective film at the end of the magnetic disk, through the disk substrate, and through the discharge path of the disk device. As a result, the carbon protective film on the surface of the magnetic disk is not charged with electric charge, so that it is possible to prevent dust from adhering to the surface of the carbon protective film.
第１図は、本発明の一実施例の磁気ディスクの構造を示
す要部の部分断面図である。FIG. 1 is a partial sectional view of essential parts showing the structure of a magnetic disk according to an embodiment of the present invention.
Claims (1)
設け、該導電性メッキ膜の表面にγ型三酸化二鉄の磁性
薄膜を設け、さらに前記磁性薄膜を覆うような状態でカ
ーボン保護膜を設けた磁気ディスクにおいて、該磁気デ
ィスクの端部で前記導電性メッキ膜が露出する状態の磁
性薄膜未形成部を設け、該磁性薄膜未形成部で前記カー
ボン保護膜と導電性メッキ膜とが接触する構造としたこ
とを特徴とする磁気ディスク。1. A conductive plating film is provided on the entire surface of a non-magnetic disk substrate, a magnetic thin film of γ-type diiron trioxide is provided on the surface of the conductive plating film, and carbon protection is further applied to cover the magnetic thin film. In the magnetic disk provided with the film, a portion where the magnetic thin film is not formed is provided at the end of the magnetic disk where the conductive plating film is exposed, and the carbon protective film and the conductive plating film are formed in the portion where the magnetic thin film is not formed. What is claimed is: 1. A magnetic disk characterized by having a structure in which the two are in contact with each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9084687A JPS63257915A (en) | 1987-04-15 | 1987-04-15 | Magnetic disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9084687A JPS63257915A (en) | 1987-04-15 | 1987-04-15 | Magnetic disk |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63257915A true JPS63257915A (en) | 1988-10-25 |
Family
ID=14009948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9084687A Pending JPS63257915A (en) | 1987-04-15 | 1987-04-15 | Magnetic disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63257915A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006209913A (en) * | 2005-01-31 | 2006-08-10 | Toshiba Corp | Patterned magnetic recording medium, stamper for preparing patterned magnetic recording medium, manufacturing method of patterned magnetic recording medium, and magnetic recording and reproducing apparatus |
-
1987
- 1987-04-15 JP JP9084687A patent/JPS63257915A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006209913A (en) * | 2005-01-31 | 2006-08-10 | Toshiba Corp | Patterned magnetic recording medium, stamper for preparing patterned magnetic recording medium, manufacturing method of patterned magnetic recording medium, and magnetic recording and reproducing apparatus |
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