JPS6040528A - Magnetic disk and its production - Google Patents
Magnetic disk and its productionInfo
- Publication number
- JPS6040528A JPS6040528A JP14903583A JP14903583A JPS6040528A JP S6040528 A JPS6040528 A JP S6040528A JP 14903583 A JP14903583 A JP 14903583A JP 14903583 A JP14903583 A JP 14903583A JP S6040528 A JPS6040528 A JP S6040528A
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- JP
- Japan
- Prior art keywords
- substrate
- magnetic
- disk
- fine powder
- aluminum
- 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.)
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Links
Landscapes
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の利用分野〕
旨
本発明は、高密度磁気記録に使用される磁気ディスクに
関し、特に摺動強度の大きな構造及びその製造方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic disk used for high-density magnetic recording, and particularly to a structure with high sliding strength and a method for manufacturing the same.
第１図は、電子計算機等の記憶装置として用いられてい
る磁気ディスク装置の概念図である。 。FIG. 1 is a conceptual diagram of a magnetic disk device used as a storage device for electronic computers and the like. .
第１図において、ベース１に回転自在に支持さ。In FIG. 1, it is rotatably supported by a base 1.
わ、た１（１１２に、複数の磁気ディスクろを増刊け、
駆。Wow, ta1 (please add multiple magnetic disks to 112,
Drive.
動手段４によって＋ＩＱｉ ２を介１７て磁気ディスク
ろを。The moving means 4 drives the magnetic disk through the +IQi 2 17.
高ｊ土で回転させる。Rotate on high soil.
一方、ベース１に摺動ｎｉＪ能に支持されたギヤリーノ
シ５にンンバル６を介して磁気ヘット７を支持・させイ
）。On the other hand, the magnetic head 7 is supported by the gear head 5 which is slidably supported on the base 1 via the armature 6).
そｌ〜で図示１７ない電子泪算機本体からの指令に。Then, the command comes from the electronic calculator itself (not shown in the figure).
より、磁気−＼ノド７を磁気ディスクろの半径方向ｌ。Therefore, the magnetic throat 7 is placed in the radial direction l of the magnetic disk.
に移動さぜ、磁気ディスク６−１−の所望の位置で記録
の書込み及び読出（７を行なうようになっている。Then, recording is written and read (7) at a desired position on the magnetic disk 6-1-.
次に第２図は磁気ディスク乙の断面図である。Next, FIG. 2 is a sectional view of the magnetic disk B.
第２図において、基板１１は、アルミニウムのごどき非
磁性体の円板である。In FIG. 2, the substrate 11 is a disk made of a non-magnetic material such as aluminum.
その基４反１１の両面に、バインダと磁性材料の微粉末
を混合した磁性膜１２が塗布され、ている。A magnetic film 12 made of a mixture of a binder and fine powder of a magnetic material is coated on both sides of the base 4 and 11.
」−記のごとき磁気ディスク装置において、通常用いら
れている浮動ヘット方式においては、磁気ディスク６の
高速回転によってその表面に生じる気流により、磁気テ
ィスフ乙の表面と磁気へノド７との間に微小な間隙が形
成され、磁気ヘッド７゜が磁気ディスク表向に接触しな
いように々ってい゛る。'' - In the floating head system normally used in magnetic disk devices such as those described above, air currents generated on the surface of the magnetic disk 6 due to high speed rotation create a minute gap between the surface of the magnetic disk 6 and the magnetic head 7. A large gap is formed so that the magnetic head 7° does not come into contact with the surface of the magnetic disk.
しかし何らかの原因によって磁気ヘッド７が磁気ディス
ク表面に稀に接触することがあり、その頻度が多く力る
と磁気ディスク表面の磁性膜１２゛が剥離するという摺
動事故が生じることがある。。However, for some reason, the magnetic head 7 may occasionally come into contact with the surface of the magnetic disk, and if this happens too often, a sliding accident may occur in which the magnetic film 12 on the surface of the magnetic disk peels off. .
上記のように磁性膜１２が剥離すると、磁気デ。When the magnetic film 12 is peeled off as described above, the magnetic film 12 is peeled off.
イスクに記録された情報が失わわてし」うので、１゜極
めて重大な事故と々る。This would cause an extremely serious accident because the information recorded on the disk would be lost.
従来、上記のごとき摺動事故への対策としては、磁性膜
１２の組成物ど１７て磁性材料とバインダの他にフィラ
ーと称するアルミナ微粉末を混入する方法が用いられて
いた。Conventionally, as a countermeasure against the above-mentioned sliding accidents, a method has been used in which fine alumina powder called a filler is mixed into the composition 17 of the magnetic film 12 in addition to the magnetic material and the binder.
上記のように硬いアルミナ微粉末を磁性膜に混入してお
くと、磁気ヘッドが磁性膜に接触したとき、アルミナ微
粉末の突起に当るため、磁性材料とバインダからなる部
分すなわち磁気記録に必要な部分に直接接触することが
なく、したがって剥・ ６ ・
１４１１を防市することが出来る。If hard alumina fine powder is mixed into the magnetic film as described above, when the magnetic head comes into contact with the magnetic film, it will hit the protrusions of the alumina fine powder. There is no direct contact with the parts, so it is possible to prevent the peeling.
ｌ−かｌ〜高密度記録を行々う場合には、上記のよ。When performing high-density recording from 1 to 1, follow the above steps.
うに磁＋ｌ材第１、バインダ及びフィラーの混合物を。Unimagnetic + l material 1st, a mixture of binder and filler.
塗布した磁性膜では、良好な電磁気特性を得るこ。The coated magnetic film has good electromagnetic properties.
どが困ガｔであり、スパッタ法等によって基板１１Ｊ：
”に直接、薄い磁性層を刺着させる方法が良好な特。However, the substrate 11J is formed by sputtering or the like:
A particularly good method is to attach a thin magnetic layer directly to the magnetic layer.
＋１を実ＪＪ）、できると１〜て研究開発が行々われて
いるδしかし上記のスパッタ法では、アルミナのフィ。However, in the above sputtering method, the amount of alumina is reduced.
ラーを混入さぜることが出来ないため、電磁気特。It has electromagnetic properties because it cannot be mixed with
性は良好であっても、摺動強度が小さいため実用、。Although it has good properties, it is not practical due to its low sliding strength.
性に乏しかった。It lacked sex.
雪た］）１１記の磁気ディスクろと磁気ヘッド７との微
小々間隙ず々わち磁気ヘッドの浮上量：は、記録密度を
高密度化するためには、より小さくする心安があイ）が
、浮」−量を小さくすれば摺動事故を生５
しる確率が大きくなるので、その点からも摺動強度の小
さいスパッタ法の磁気ディスクは実用化が困φ（（であ
−）だ。It is safe to make the minute gap between the magnetic disk slot and the magnetic head 7 (the flying height of the magnetic head) smaller in order to increase the recording density. However, if the floating amount is reduced, the probability of a sliding accident will increase, so from this point of view as well, sputtering magnetic disks with low sliding strength are difficult to put into practical use. is.
′８１）／こ従来のフィラーを含んだ混合物を塗布する
方法でｖｌ、フィラーＶこよる突起の高さを均一がっ・
４ ・
精密に設定することが困難であるため、磁気ヘノ。'81)/This conventional method of applying a mixture containing filler can make the height of the protrusions uniform due to VL and filler V.
4. Magnetic heno because it is difficult to set accurately.
ドの浮上量をあ捷り小さく設定することが出来々。It is possible to set the flying height of the board to a small value.
かった。won.
本発明は」−記の問題を解決するためになされだ５もの
であり、高密度記録が可能であり、かつ摺動。The present invention has been devised to solve the problems mentioned above, and is capable of high-density recording and sliding.
強度の大きな磁気ディスク及びその製造方法を提。We propose a magnetic disk with high strength and a method for manufacturing the same.
供することを目的どする。The purpose is to provide.
上記の目的を達成するため本発明の磁気ディス１０りは
、基板表面上からの高さが所要スペーシング。In order to achieve the above object, the magnetic disk 10 of the present invention has a height above the substrate surface with a required spacing.
以下の値をもった高硬度物質からなる多数の微小。A large number of microscopic particles made of highly hard materials with the following values.
々突起を形成した基板を用い、その基板上に磁性。It uses a substrate with many protrusions formed on it, and is magnetic on the substrate.
層を付着させたものである。layers are attached.
なお所要スペーシングとは、前記の磁気ヘッドｌ。Note that the required spacing refers to the above-mentioned magnetic head l.
の浮上量の設計値であり、必要とする記録密度や摺動事
故に対する安全性等から選定され、る値である。This is the design value of the flying height of the disk, which is selected based on the required recording density, safety against sliding accidents, etc.
上記のごとく本発明の磁気ディスクにおいては、予め微
小な突起を形成した基板を用いるので、その」−に磁性
層を利着させるにｄ、スパッタ法ヲ用。As described above, since the magnetic disk of the present invention uses a substrate on which minute projections are formed in advance, a sputtering method is used to attach the magnetic layer to the substrate.
いて直接、伺着さぜることか出来るため、電磁気゛特性
を向上さぜ、高密度記録が【１１′能どなる。 ４だ基
板表面に形成された高硬度物質の微小な゛突起のため、
磁気ヘットが磁性層に直接接触する５おそわ−がなくな
るため、摺動事故に対する耐久性゛にも優わている。Since it is possible to directly touch the magnetic field, it improves the electromagnetic properties and enables high-density recording. Due to the minute protrusions of high hardness material formed on the surface of the four-dimensional substrate,
Since there is no need to worry about direct contact between the magnetic head and the magnetic layer, it also has excellent durability against sliding accidents.
件だ本発明の製造方法は、基板Ｊ−に高硬度物質の微粉
末を塗布し、そノ１．を鏡面仕上げされた平板。In the manufacturing method of the present invention, a fine powder of a high-hardness substance is applied to the substrate J-, and step 1. A flat plate with a mirror finish.
にに１−さんで抑圧することにより、微粉末を基板面１
゜に押込み、次に基板表面を所要スペーシング以下の厚
さだけエツチングすることにより、基板表面からの高さ
が所要スペーシング以下の多数の微小な突起をイ）つだ
基板をつくり、次にその基板表面に磁性層を付着さぜる
ものである。By pressing the fine powder with a sandwich, the fine powder is
By pressing the substrate into A magnetic layer is attached to the surface of the substrate.
上記のごどき製造方法によれば、基板表向上の突起の高
さを均一かつ精密に設定することが出来、捷だ基板ｊ７
ｉ’ｉに突起を堅固に形成することが出来る。According to the manufacturing method described above, the height of the protrusions on the surface of the substrate can be set uniformly and precisely, and the height of the protrusions on the surface of the substrate can be set uniformly and precisely.
A protrusion can be firmly formed on i'i.
以下実施例に基づいて本発明の詳細な説明する。 The present invention will be described in detail below based on Examples.
第６図（ｒ：Ｌ本発明の磁気ディスクの製造方法を示。FIG. 6 (r:L) shows a method for manufacturing a magnetic disk of the present invention.
す工程図である。This is a process diagram.
１ず工程２１で、基板として用いるアルミニラｊ、゛円
板を切削加−王で作る。1. In step 21, an aluminum disc to be used as a substrate is made by cutting.
次に工程２２で、上記アルミニウム円板の表面研５摩を
行々う。ここ捷で工程は従来と同様である。Next, in step 22, the surface of the aluminum disk is polished. The process here is the same as before.
次に工程２３で、」−記アルミニウノ、円板の表面に゛
アルミナ微粉末の塗布を行なう。Next, in step 23, fine alumina powder is applied to the surface of the aluminum disk.
具体的には、所要スペーシングを考慮して選定・しだ粒
径が０．５μｍη〜２μｍ程度のアルミナ微粉末）。Specifically, alumina fine powder with a grain size of about 0.5 μm to 2 μm is selected in consideration of the required spacing.
を用い、塗布の結果、１ｃｍ 当りの粒数が１００゜乃
至１０００個程度分布するように、適当なバインダ（例
えばニトロセルローズ）を含む液体（例えば酢酸アミル
）にアルミナ微粉末を懸濁させたものを同転塗布し、そ
れを乾燥させる。 １゜なお回転塗布とは、アルミニウ
ム円板を回転させながら、その−（二に−に記懸濁液を
点滴し、遠心力によって一様に薄く塗布する方法である
。Fine alumina powder is suspended in a liquid (e.g. amyl acetate) containing a suitable binder (e.g. nitrocellulose) so that the number of particles per cm is distributed between 100° and 1000 as a result of coating. Apply the same amount and let it dry. 1. Rotary coating is a method in which the suspension described in (2) is dripped onto an aluminum disk while it is being rotated, and the suspension is applied uniformly and thinly by centrifugal force.
１だ上記の例では、アルミナ微粉末を用いだが、高硬度
物質で安定性の良い物であれば、他の物質・ ７ ・
を用いても良い。1. In the above example, fine alumina powder is used, but other materials may be used as long as they are highly hard and stable.
次に工程２４では、アルミナ微粉末を塗布したア。Next, in step 24, a fine alumina powder was applied.
ルミニウノ、円板を、別に用意した表面を鏡面研摩゛１
−だステンレス板（高硬度物質であわ、ば他の物で。Mirror-polishing the surface of the Luminion disc prepared separately 1
- Stainless steel plate (if it is made of a high hardness material, it may not be made of other materials).
も可）にはさみ、高圧プレスで押圧ずろことによ５す、
アルミナ微粉末をアルミニウム円板面に埋込゛む。(also available), press with scissors, and press with a high-pressure press.
Alumina fine powder is embedded into the surface of an aluminum disk.
次に二「程２５では、アルミニウム円板の表面を薬。Next, in Step 25, the surface of the aluminum disk was coated with a medicine.
品又ｄ、スパッタによってエツチングする。Etching by sputtering.
このエツチングの際、軟かいアルミニウムのみ１゜が削
らね、アルミナ微粉末はその′！ｆ、を残るから１、ア
ルミニウム円板の表面に、アルミナ微粉末が半。During this etching, only 1° of soft aluminum is removed, but the fine alumina powder is removed! Since f, remains 1, half of the alumina fine powder is on the surface of the aluminum disk.
ば埋込１：れた形で多数の微小な突起を形成することに
なる。Embedding 1: A large number of minute protrusions are formed in a curved shape.
捷だエツチングの深さｄ］、所要スペーシング以下の値
にする。Depth of curvature etching d], set to a value less than or equal to the required spacing.
上記の工程により、アルミニウム円板の表面に、その高
さが全て均一々多数の微小な突起を形成することが出来
る。By the above process, a large number of minute protrusions of uniform height can be formed on the surface of the aluminum disk.
な“Ｌ−エツチング川の薬液としては、例えば赤面・
８ ・
塩６００ｇと苛性力’Ｊ２０ｇとを水１１に溶解しだ
。Examples of medicinal liquids in the L-Etching River include blush,
8. Dissolve 600 g of salt and 20 g of caustic power in water 11.
.
ものを用いるととが出来る。When you use things, you can make things.
まだエツチング後は、水やアルコールでよく洗。After etching, wash thoroughly with water or alcohol.
滌したのち、乾燥させることは、通常のエノチン。After being soaked, it is normal to dry the enotine.
グと同様である。It is similar to
次に工程２６では、上記の突起を形成したアルミニウム
円板の表面に、磁性層を付着する。 ゛この場合、スパ
ッタ法を用いて磁性層を形成す・れば、電磁気特性の優
れた磁性層を得ることが出・来るが、通常の塗布による
方法等を用いることも、１１出来る。Next, in step 26, a magnetic layer is deposited on the surface of the aluminum disk on which the projections have been formed. In this case, if the magnetic layer is formed using a sputtering method, a magnetic layer with excellent electromagnetic properties can be obtained, but it is also possible to use a conventional coating method.
次に工程２７では、磁気ヘッドと接触した場合。Next, in step 27, when contact is made with the magnetic head.
の衝撃力を弱めるため、潤滑剤（例えば油）を塗。Apply lubricant (for example, oil) to reduce the impact force.
布する。to clothe
なお、工程２６で、スパッタ法を用いる場合、基ｌ。In addition, when using the sputtering method in step 26, the group l.
板表面がアルミニウムの酸化膜である方が磁性層の密着
性が良い場合がある。If the plate surface is an aluminum oxide film, the adhesion of the magnetic layer may be better in some cases.
そのよう々場合には、工程２５と２６との間に工程２５
′として、突起を形成１〜だのちのアルミニウム円板の
表面を酸化又はアルマイト処理する］−程を設けわ、ば
良い。In such a case, between steps 25 and 26, step 25
After forming the protrusions, the surface of the aluminum disk is oxidized or alumite-treated.
次に第４図ｄ−１本発明の磁気ディスクの断面図。Next, FIG. 4 d-1 is a sectional view of the magnetic disk of the present invention.
である。It is.
第４図（Ａ）は、］二程２５で、基板（アルミニウム゛
円板）１６の表面に多数の微小な突起１４を形成し５た
ものを示す。FIG. 4(A) shows a large number of minute protrusions 14 formed on the surface of a substrate (aluminum disk) 16 in step 25.
寸だ第４図（１１）は、基板表面側近の拡大断面図゛で
あり、１５は磁性層を示す。Figure 4 (11) is an enlarged sectional view of the vicinity of the substrate surface, and 15 indicates the magnetic layer.
なお実際の磁性層１５の厚さは、０．１１ｚｍ以下で。Note that the actual thickness of the magnetic layer 15 is 0.11 zm or less.
あり、所要スペーシング（突起の高さよりやや犬１゜）
に比べて非常に小さい値である。Yes, required spacing (slightly 1° from the height of the protrusion)
This is a very small value compared to .
」二記のごとき磁気ディスクにおいては、基板表。For magnetic disks such as those listed in item 2, the board surface.
面に多数の微小な突起１４が形成されているので、磁気
ヘッドが接触した場合でも、突起の先端に当。Since a large number of minute protrusions 14 are formed on the surface, even if a magnetic head comes into contact with it, it will hit the tips of the protrusions.
るだけで磁性層には接触せず、したがって磁性層１゜が
剥離することが々い。The magnetic layer does not come into contact with the magnetic layer, and therefore the magnetic layer 1° often peels off.
なお磁気ヘッドと突起が接触したとき、突起上の磁性層
が剥離したとしても、突起の面積は基板表面の全面積に
比べて極めて小さいから、ディジタル信号の記録再生に
用いられる磁気ディスクとしては障害とはならない。Even if the magnetic layer on the protrusions peels off when the magnetic head and the protrusions come into contact, the area of the protrusions is extremely small compared to the total area of the substrate surface, so this is not a problem for magnetic disks used for recording and reproducing digital signals. It is not.
以」二説明したごどく本発明の磁気ディスクにお′いて
は、予め微小な突起を形成した基板を用いろ。In the magnetic disk of the present invention as described below, a substrate on which minute protrusions are formed in advance is used.
ので、その」二に磁性層を付着させるには、スパン５り
法を用いて直接、旧著させることが出来るため、電磁気
特性を向上させ、高密度記録が可能となる６壕だ基板表
面に形成されまた高硬度物質の微小な・突起のため、磁
気ヘッドが磁性層に直接接触する。Therefore, in order to attach the magnetic layer to the second layer, it is possible to directly attach the magnetic layer to the surface of the substrate using the span bonding method, which improves electromagnetic properties and enables high-density recording. The magnetic head comes into direct contact with the magnetic layer due to the minute protrusions formed in the highly hard material.
おそれがなくなるため、摺動事故に対する耐久性、。Durability against sliding accidents, eliminating the risk of sliding accidents.
にも優れている。It is also excellent.
捷だ本発明の磁気ディスクの製造方法において。In the method for manufacturing a magnetic disk of the present invention.
は、基板表面に高硬度物質の微粉末を塗布したのち、平
板で押圧して微粉末を押込み、次に基板面をエツチング
することによって微小な突起を形成ｌコ
するように構成しているので、突起の高さを均一にする
ことが出来、かつ精密に設定することが出来る。そのた
め所要スペーシングの値を小さく設定することが出来る
ので、記録密度を向上さぜることか出来る。The structure is such that after applying fine powder of a highly hard substance to the surface of the substrate, pressing it with a flat plate to push the fine powder in, and then etching the substrate surface to form minute protrusions. , the height of the protrusions can be made uniform and can be set precisely. Therefore, since the required spacing value can be set small, the recording density can be improved.
・１１・
寸だ基板面に微小々突起を堅固に形成するとと゛が出来
るので、摺動事故に対する耐久性も向上さ。・11. If small protrusions are firmly formed on the surface of a large substrate, it will be possible to create cracks, which will improve durability against sliding accidents.
せることか出来る等、多くの効果がある。 。It has many effects, such as making it more effective. .
第１図は磁気ティスフ装置の概念図、第２図は５従来の
磁気ディスクの一例の断面図、第６図は本。
発明の製造方法の一実施例の工程図、第４図は本゛発明
の磁気ディスクの一実施例の断面図である。・符号の説
明
１・・・ベース ２・・・軸 、。
６・・・磁気ディスク ４・・・駆動手段５・・・キャ
リッジ ６・・・ジンバル７・・・磁気ヘッド １１・
・・基板
１２・・磁性膜 １３・・・基板
１４・・・突起 １５・・・磁性層 １゜代理人弁理士
中村純之助
・１２・
矛１ 図
矛２図
旦
矛３図
才４図
（Ａ）
Ａ
（Ｂ）Fig. 1 is a conceptual diagram of a magnetic disk device, Fig. 2 is a sectional view of an example of a conventional magnetic disk, and Fig. 6 is a book. FIG. 4 is a process diagram of an embodiment of the manufacturing method of the invention, and is a sectional view of an embodiment of the magnetic disk of the invention.・Explanation of symbols 1...Base 2...Axis. 6... Magnetic disk 4... Drive means 5... Carriage 6... Gimbal 7... Magnetic head 11.
...Substrate 12...Magnetic film 13...Substrate 14...Protrusion 15...Magnetic layer 1゜Representative Patent Attorney Junnosuke Nakamura・12. ) A (B)
Claims (4)
高硬度物質からなる多数の微小な突起を表面。 に形成した基板と、該基板上に付着せしめられた。 磁性層とからなる磁気ディスク。(1) A surface with many minute protrusions made of a highly hard material whose height from the substrate surface is 5 or less than the required spacer. A substrate was formed on the substrate and the substrate was attached onto the substrate. A magnetic disk consisting of a magnetic layer.
ィスク。(2) Alumina is used as the high hardness material. A magnetic 1° disk according to claim 1, characterized in that:
面仕上げされた平板にはさんで押圧することにより、微
粉末を基板面に埋込み、次に基板表面を所要スペーシン
グ以下の厚さだけエツチング５ することによシ、基板表面からの高さが所要スペーシン
グ以下の多数の微小な突起をもった基板をつくり、次に
その基板表面に磁性層を付着させることを特徴とする磁
気ディスクの製造方法。(3) Apply a fine powder bed of high-hardness material on the substrate, press it between mirror-finished flat plates to embed the fine powder into the substrate surface, and then spread the substrate surface to the required spacing or less. The method is characterized in that a substrate having a large number of minute protrusions whose height from the substrate surface is less than or equal to the required spacing is created by etching the thickness 5, and then a magnetic layer is attached to the substrate surface. A method for manufacturing magnetic disks.
、それを鏡面仕上げされたステンレス板には゛さんで高
圧プレスで押圧することにより、アルミ。 ナ微粉末をアルミニウム、円板面に埋込み、次にア。 ルミニウム円板表面を薬品又はスパッタによって゛所要
スペーシング以下の厚さだけエツチングする５ことによ
り、所要スペーシング以下の高さをもつ。 だ多数のアルミナ微粉末の突起を有するアルミニ。 ラム円板をつくり、次にアルミニウム円板表面に。 磁性層を付着させることを特徴とする特許請求の。 範囲第６項記載の磁気ディスクの製造方法。 １゜（５
）上記アルミナ微粉末の粒径を０．３ｚｚｍ乃至２μｍ
にしたことを特徴とする特許請求の範囲第４項記載の磁
気ディスクの製造方法。(4) Aluminum is produced by applying fine alumina powder onto an aluminum disk, sandwiching it between mirror-finished stainless steel plates, and pressing it with a high-pressure press. Embed the fine powder into the aluminum disk surface, and then a. By etching the surface of the aluminum disk by chemicals or sputtering to a thickness that is less than the required spacing, it has a height that is less than the required spacing. It is made of aluminum with many protrusions of fine alumina powder. Make a ram disk, then make an aluminum disk surface. Claims characterized in that a magnetic layer is deposited. A method for manufacturing a magnetic disk according to scope 6. 1° (5
) The particle size of the above fine alumina powder is 0.3zzm to 2μm.
A method of manufacturing a magnetic disk according to claim 4, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14903583A JPS6040528A (en) | 1983-08-15 | 1983-08-15 | Magnetic disk and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14903583A JPS6040528A (en) | 1983-08-15 | 1983-08-15 | Magnetic disk and its production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6040528A true JPS6040528A (en) | 1985-03-02 |
| JPH0320814B2 JPH0320814B2 (en) | 1991-03-20 |
Family
ID=15466232
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14903583A Granted JPS6040528A (en) | 1983-08-15 | 1983-08-15 | Magnetic disk and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6040528A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01263932A (en) * | 1988-04-14 | 1989-10-20 | Nec Corp | Magnetic recording body and production thereof |
| EP0422640A2 (en) * | 1989-10-13 | 1991-04-17 | Hitachi, Ltd. | Magnetic disk apparatus and magnetic disk |
| US5504646A (en) * | 1989-10-13 | 1996-04-02 | Hitachi, Ltd. | Magnetic disk including protective layer having surface with protusions and magnetic disk apparatus including the magnetic disk |
| US5576918A (en) * | 1991-12-17 | 1996-11-19 | Baradun R&D Ltd. | Magnetic disk medium with designed textured surfaces and controlled surface roughness and method of producing same |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6038720A (en) * | 1983-08-09 | 1985-02-28 | Fujitsu Ltd | Substrate for magnetic disk |
-
1983
- 1983-08-15 JP JP14903583A patent/JPS6040528A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6038720A (en) * | 1983-08-09 | 1985-02-28 | Fujitsu Ltd | Substrate for magnetic disk |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01263932A (en) * | 1988-04-14 | 1989-10-20 | Nec Corp | Magnetic recording body and production thereof |
| EP0422640A2 (en) * | 1989-10-13 | 1991-04-17 | Hitachi, Ltd. | Magnetic disk apparatus and magnetic disk |
| US5285343A (en) * | 1989-10-13 | 1994-02-08 | Hitachi, Ltd. | Magnetic disk with surface protective layer having convex portions and magnetic disk apparatus including such a magnetic disk |
| US5504646A (en) * | 1989-10-13 | 1996-04-02 | Hitachi, Ltd. | Magnetic disk including protective layer having surface with protusions and magnetic disk apparatus including the magnetic disk |
| US5930073A (en) * | 1989-10-13 | 1999-07-27 | Hitachi, Ltd. | Magnetic disk including protective layer having surface with magnetic disk including protrusions, and magnetic disk apparatus including the magnetic disk |
| US6303205B1 (en) | 1989-10-13 | 2001-10-16 | Hitachi, Ltd. | Magnetic disk including protective layer having surface with protrusions, and substrate therefor |
| US5576918A (en) * | 1991-12-17 | 1996-11-19 | Baradun R&D Ltd. | Magnetic disk medium with designed textured surfaces and controlled surface roughness and method of producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0320814B2 (en) | 1991-03-20 |
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