JPH06101095B2 - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPH06101095B2 JPH06101095B2 JP5310686A JP5310686A JPH06101095B2 JP H06101095 B2 JPH06101095 B2 JP H06101095B2 JP 5310686 A JP5310686 A JP 5310686A JP 5310686 A JP5310686 A JP 5310686A JP H06101095 B2 JPH06101095 B2 JP H06101095B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic head
- lubricating oil
- recording medium
- magnetic
- fluorine
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） 本発明は、フロッピーディスク、ハードディスク、VTR
などに使用される磁気ヘッドに係わり、特に磁気記録媒
体と潤滑油を介して接触する磁気ヘッドの吸着現象を防
止できるようにした磁気ヘッドに関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a floppy disk, a hard disk, and a VTR.
The present invention relates to a magnetic head used for example, and more particularly to a magnetic head capable of preventing an adsorption phenomenon of a magnetic head that comes into contact with a magnetic recording medium through a lubricating oil.
（従来の技術） 近年、情報処理技術の発達に伴って記憶装置が担う情報
処理量は飛躍的に増加し、磁気記録装置に対する大容量
化および信頼性の要求が益々高まっている。(Prior Art) In recent years, with the development of information processing technology, the amount of information processing carried by a storage device has dramatically increased, and demands for large capacity and reliability of magnetic recording devices have been increasing more and more.
このため、大容量化に適したCo−Crのような金属薄膜を
用いた磁気記録媒体も使用されているが、このような金
属磁性薄膜を用いた磁気記録媒体では、特に磁気ヘッド
との表面潤滑が重要な問題となる。つまり、ハードディ
スクではコンタクト・スタート・ストップ時に磁気ヘッ
ドと磁気ディスクとが直接接触を繰返し、またフロッピ
ーディスク装置では、高速回転している磁気ディスクに
リード・ライト期間中磁気ヘッドが接触状態を保ってい
る。このため、磁気ディスクの表面潤滑が適切でない
と、その表面にスクラッチを生じ、摩耗が進行して磁気
ディスクの寿命や性能が低下してしまうという問題があ
る。勿論、このような問題は他の塗布型記録媒体に共通
する問題でもある。Therefore, although a magnetic recording medium using a metal thin film such as Co-Cr suitable for increasing the capacity is also used, in the magnetic recording medium using such a metal magnetic thin film, especially the surface of the magnetic head Lubrication is an important issue. That is, in the hard disk, the magnetic head and the magnetic disk repeatedly make direct contact at the time of contact start / stop, and in the floppy disk device, the magnetic head keeps contacting the magnetic disk rotating at high speed during the read / write period. . For this reason, if the surface lubrication of the magnetic disk is not appropriate, there is a problem that scratches are generated on the surface, wear progresses, and the life and performance of the magnetic disk decrease. Of course, such a problem is also a problem common to other coating type recording media.
そこで、例えば磁気ディスク記録媒体の場合には、本出
願人が先に出願した特願昭59−276148号（未公知）で述
べられたように媒体保護用の不織布に潤滑油を含浸する
方法や、スピンコート法等によって媒体表面に潤滑油の
保護膜を形成することが行われている。Therefore, for example, in the case of a magnetic disk recording medium, a method of impregnating a non-woven fabric for medium protection with a lubricating oil, as described in Japanese Patent Application No. 59-276148 (not known) previously filed by the present applicant, A protective film of lubricating oil is formed on the surface of a medium by a spin coating method or the like.
ところが、上記のように磁気記録媒体の表面に潤滑油を
コーティングすると、しばしば磁気記録媒体と磁気ヘッ
ドとの間の相対移動が困難になることがあった。However, when the surface of the magnetic recording medium is coated with the lubricating oil as described above, the relative movement between the magnetic recording medium and the magnetic head often becomes difficult.
第２図は磁気ヘッドと磁気記録媒体との間の潤滑油の膜
厚を変化させた場合の摩擦係数の測定データである。一
般に乾面同士の接触の際には、その摩擦係数が最大でも
0.5程度であるが、図に示すように潤滑油が介在する
と、膜厚によってはこの値を大きく超えてしまう。この
ような場合には接触物同士に摩擦力以外のならんかの力
が作用していることが考えられる。このような力には、
潤滑油の粘性による抵抗力や潤滑油の表面張力による吸
着力が考えられる。しかし、潤滑油の粘性力は通常、非
常に小さいため、ここでは潤滑油の表面張力による吸着
力に着目する必要がある。FIG. 2 shows measurement data of the friction coefficient when the film thickness of the lubricating oil between the magnetic head and the magnetic recording medium is changed. Generally, when the dry surfaces are in contact with each other,
Although it is about 0.5, if lubricating oil is present as shown in the figure, this value will be greatly exceeded depending on the film thickness. In such a case, it is considered that some other force than the frictional force acts on the contacting objects. With such power,
The resistance due to the viscosity of the lubricating oil and the adsorption force due to the surface tension of the lubricating oil are considered. However, since the viscous force of the lubricating oil is usually very small, it is necessary to pay attention to the attraction force due to the surface tension of the lubricating oil here.
第３図は、吸着現象に関するデータであり、磁気ヘッド
と磁気記録媒体との間の潤滑油の表面張力を種々変化さ
せたときの結果である。この図から明らかなように、潤
滑油の表面張力が大きくなればなるほど強力な吸着現象
が生じている。FIG. 3 shows data relating to the adsorption phenomenon and shows the results when the surface tension of the lubricating oil between the magnetic head and the magnetic recording medium is variously changed. As is clear from this figure, the stronger the surface tension of the lubricating oil, the stronger the adsorption phenomenon occurs.
（発明が解決しようとする問題点） このように、潤滑油を介して磁気記録媒体に接触する従
来の磁気ヘッドにおいては、磁気記録媒体と磁気ヘッド
との間にしばしば吸着が起り、磁気記録媒体と磁気ヘッ
ドとの相対移動が困難になるという問題があった。(Problems to be Solved by the Invention) As described above, in the conventional magnetic head that comes into contact with the magnetic recording medium via the lubricating oil, adsorption often occurs between the magnetic recording medium and the magnetic recording medium. There is a problem that it becomes difficult to move relative to the magnetic head.
本発明は、このような潤滑油を介して磁気記録媒体と接
触する磁気ヘッドにあって、吸着現象を生じることのな
い磁気ヘッドを提供することを目的とする。It is an object of the present invention to provide a magnetic head that comes into contact with a magnetic recording medium through such a lubricating oil and does not cause an adsorption phenomenon.
［発明の構成］ （問題点を解決するための手段） 本発明は、相対移動する記録媒体にフッソ系潤滑油を介
して接触する磁気ヘッドにおいて、前記記録媒体との接
触面に対して、前記記録媒体よりもフッソ系潤滑油に対
する濡れ性の悪い材料がコーティングしたことを特徴と
している。[Structure of the Invention] (Means for Solving Problems) The present invention relates to a magnetic head that contacts a relatively moving recording medium via a fluorine-based lubricating oil, with respect to a contact surface with the recording medium. It is characterized in that it is coated with a material having a lower wettability with respect to the fluorine-based lubricating oil than the recording medium.
たとえば記録媒体側の保護層がSi3N4,SiO2,ZrO2,WCの場
合には、磁気ヘッドの接触面へのコーティング材料とし
てBN,TiNなどが選択される。For example, when the protective layer on the recording medium side is Si 3 N 4 , SiO 2 , ZrO 2 , and WC, BN, TiN, etc. are selected as the coating material for the contact surface of the magnetic head.
（作用） 一般に、上述したような吸着現象によって生じる吸着力
Ｆは、 Ｆ＝（2A・δ・cosθ）/h で示される。ここに、Ａは潤滑油と磁気ヘッドの接触面
積、δは潤滑油の表面張力、θは磁気ヘッドに対する潤
滑油の濡れ角、ｈは磁気ヘッドと磁気記録媒体との間の
距離である。(Operation) In general, the suction force F generated by the above-described suction phenomenon is expressed by F = (2A · δ · cosθ) / h. Here, A is the contact area between the lubricating oil and the magnetic head, δ is the surface tension of the lubricating oil, θ is the wetting angle of the lubricating oil with respect to the magnetic head, and h is the distance between the magnetic head and the magnetic recording medium.
この式から明らかなように、吸着力Ｆを減少させるには
磁気ヘッドに対する潤滑油の濡れ角θを大きくすれば良
い。通常、この種の潤滑油にはフッ素系潤滑油が使用さ
れるため、磁気ヘッドの記録媒体接触部にフッ素系潤滑
油に対して濡れ性の悪い材料を用いれば良い。BN,TiN
は、フッ素系潤滑油に対し濡れ性が悪い。本発明では、
これらの材料を磁気ヘッドにコーティングしているの
で、吸着力Ｆが抑制される。As is clear from this equation, in order to reduce the attraction force F, the wetting angle θ of the lubricating oil with respect to the magnetic head may be increased. Usually, a fluorine-based lubricating oil is used as this type of lubricating oil, so a material having poor wettability with respect to the fluorine-based lubricating oil may be used for the recording medium contact portion of the magnetic head. BN, TiN
Has poor wettability with a fluorine-based lubricating oil. In the present invention,
Since the magnetic head is coated with these materials, the attractive force F is suppressed.
（実施例） 以下、図面を参照しながら、本発明の一実施例について
説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図は片面ヘッドのフロッピーディスク装置に本発明
を適用した例を示す図である。円板状の磁気記録媒体１
の下面には、曲率半径が例えば50mmで空気軸受に支持さ
れた移動自在の磁気ヘッド２が当接されている。磁気記
録媒体１を介して上記磁気ヘッド２と対向する位置に
は、フェルトパッド３が配設されている。FIG. 1 is a diagram showing an example in which the present invention is applied to a floppy disk device having a single-sided head. Disc-shaped magnetic recording medium 1
A movable magnetic head 2 having a radius of curvature of, for example, 50 mm and supported by an air bearing is in contact with the lower surface of the. A felt pad 3 is arranged at a position facing the magnetic head 2 with the magnetic recording medium 1 interposed therebetween.
磁気記録媒体１は、例えば可撓性樹脂フィルムからなる
基体の上にCo−Cr金属薄膜の記録磁性層を形成し、この
記録磁性層の上にSi3N4からなる保護層を形成し、さら
に上記保護層の上にフッ素系の潤滑油を、例えばスピン
コートによって形成したものである。In the magnetic recording medium 1, for example, a recording magnetic layer of a Co—Cr metal thin film is formed on a substrate made of a flexible resin film, and a protective layer made of Si 3 N 4 is formed on the recording magnetic layer. Further, a fluorine-based lubricating oil is formed on the protective layer by, for example, spin coating.
磁気ヘッド２は、フェライト母材の摺動面にBN（窒化ボ
ロン）を例えばスパッタリングによりコーティングした
ものである。The magnetic head 2 is formed by coating a sliding surface of a ferrite base material with BN (boron nitride) by, for example, sputtering.
以上の構成のフロッピーディスクにおいて、磁気記録媒
体１上にフッ素系潤滑油を介して磁気ヘッド２を接触さ
せ、磁気記録媒体１を回転・停止を繰返したところ、吸
着現象は生じないことが確認できた。When the magnetic head 2 was brought into contact with the magnetic recording medium 1 through the fluorine-based lubricating oil and the magnetic recording medium 1 was repeatedly rotated and stopped in the floppy disk having the above-described structure, it was confirmed that the adsorption phenomenon did not occur. It was
ところで、従来は、磁気記録媒体１の Si3N4の保護層と、磁気ヘッドであるフェライト表面と
の間にフッ素系潤滑油が介在していた。フェライトとSi
3N4とをフッ素系潤滑油の濡れ性について比べると、Si3
N4の方が悪い。従って磁気ヘッド側のフェライト表面の
濡れ性を悪化させた方が吸着力排除という面から見て効
果がある。第４図は磁気ヘッドのコーティング材料とし
て考えられるものについてフッ素系潤滑油の濡れ性を、
濡れ広がり速度の面から調査した結果である。この図か
ら明らかなように、BN,TiN（窒化チタン）は、フェライ
トよりも濡れ性が悪いSi3N4よりも更に濡れ性が悪い。
したがって、これらの材料をコーティング材として使用
することにより吸着現象は効果的に防止できる。By the way, conventionally, a fluorine-based lubricating oil has been interposed between the Si 3 N 4 protective layer of the magnetic recording medium 1 and the surface of the ferrite that is the magnetic head. Ferrite and Si
Comparing 3 N 4 with the wettability of fluorine-based lubricating oil, Si 3
N 4 is worse. Therefore, worsening the wettability of the ferrite surface on the magnetic head side is more effective in terms of eliminating the attractive force. Fig. 4 shows the wettability of the fluorine-based lubricating oil for the possible coating materials for magnetic heads.
This is the result of an investigation in terms of the wetting and spreading speed. As is clear from this figure, BN and TiN (titanium nitride) have even worse wettability than Si 3 N 4 which has poorer wettability than ferrite.
Therefore, the adsorption phenomenon can be effectively prevented by using these materials as the coating material.
また、第４図からも明らかなように、BN,TiNは、Si3N4
やSiO2,ZrO2,WCと比較しても濡れ広がり速度が小さいの
で、これらの材料を記録媒体側にコーティングした場合
にも同様の効果が得られる。Further, as is apparent from FIG. 4, BN, TiN is, Si 3 N 4
Since the wetting and spreading speed is lower than that of SiO 2 , ZrO 2 , and WC, the same effect can be obtained when these materials are coated on the recording medium side.
なお、磁気ヘッドへのBN,TiNのコーティングは、特にス
パッタリングに限らず、蒸着等他の方法によっても良
い。The coating of BN and TiN on the magnetic head is not limited to sputtering in particular, and other methods such as vapor deposition may be used.
［発明の効果］ 以上のように本発明によれば、磁気ヘッドの摺動面のフ
ッ素系潤滑油に対する濡れ性を低下させることができる
ので、磁気ヘッドと磁気記録媒体との間の吸着を効果的
に防止することができる。[Advantages of the Invention] As described above, according to the present invention, the wettability of the sliding surface of the magnetic head with the fluorine-based lubricating oil can be reduced, so that the adsorption between the magnetic head and the magnetic recording medium is effective. Can be prevented.
第１図は本発明の一実施例に係るフロッピーディスク装
置の一部を示す側面図、第２図は磁気ヘッドと磁気記録
媒体との間の潤滑油の油膜と摩擦係数との関係を示す
図、第３図は同潤滑油の表面張力と摩擦係数との関係を
示す図、第４図は磁気ヘッドの摺動面のコーティング材
とフッ素系油の濡れ広がり速度との関係を示す図であ
る。 １…磁気記録媒体、２…磁気ヘッド、３…フェルトパッ
ド。FIG. 1 is a side view showing a part of a floppy disk device according to an embodiment of the present invention, and FIG. 2 is a view showing a relationship between an oil film of lubricating oil and a friction coefficient between a magnetic head and a magnetic recording medium. FIG. 3 is a diagram showing the relationship between the surface tension and the friction coefficient of the lubricating oil, and FIG. 4 is a diagram showing the relationship between the coating material on the sliding surface of the magnetic head and the wetting and spreading speed of the fluorine-based oil. . 1 ... Magnetic recording medium, 2 ... Magnetic head, 3 ... Felt pad.
Claims (1)
介して接触する磁気ヘッドにおいて、 前記記録媒体との接触面には、前記記録媒体よりもフッ
ソ系潤滑油に対する濡れ性の悪い材料がコーティングさ
れていることを特徴とする磁気ヘッド。1. A magnetic head that contacts a relatively moving recording medium through a fluorine-based lubricating oil, and a contact surface with the recording medium is made of a material having a lower wettability with the fluorine-containing lubricating oil than the recording medium. A magnetic head characterized by being coated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5310686A JPH06101095B2 (en) | 1986-03-11 | 1986-03-11 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5310686A JPH06101095B2 (en) | 1986-03-11 | 1986-03-11 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62209709A JPS62209709A (en) | 1987-09-14 |
| JPH06101095B2 true JPH06101095B2 (en) | 1994-12-12 |
Family
ID=12933537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5310686A Expired - Fee Related JPH06101095B2 (en) | 1986-03-11 | 1986-03-11 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06101095B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01311408A (en) * | 1988-06-09 | 1989-12-15 | Victor Co Of Japan Ltd | Magnetic head |
| JP2518424B2 (en) * | 1989-11-17 | 1996-07-24 | 日新電機株式会社 | Magnetic head and manufacturing method thereof |
| JP2503717B2 (en) * | 1990-04-06 | 1996-06-05 | 日新電機株式会社 | Magnetic head |
-
1986
- 1986-03-11 JP JP5310686A patent/JPH06101095B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62209709A (en) | 1987-09-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |