JPH02161609A - Magnetic recording medium - Google Patents
Magnetic recording mediumInfo
- Publication number
- JPH02161609A JPH02161609A JP31598088A JP31598088A JPH02161609A JP H02161609 A JPH02161609 A JP H02161609A JP 31598088 A JP31598088 A JP 31598088A JP 31598088 A JP31598088 A JP 31598088A JP H02161609 A JPH02161609 A JP H02161609A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic recording
- substrate
- layer
- recording medium
- synthetic 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.)
- Pending
Links
- 239000000758 substrate Substances 0.000 claims abstract description 31
- 229920003002 synthetic resin Polymers 0.000 claims abstract description 21
- 239000000057 synthetic resin Substances 0.000 claims abstract description 21
- 230000007547 defect Effects 0.000 abstract description 8
- 239000000428 dust Substances 0.000 abstract description 3
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract 6
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000011651 chromium Substances 0.000 description 9
- 229910052804 chromium Inorganic materials 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- 229910000531 Co alloy Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004697 Polyetherimide Substances 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 229920001601 polyetherimide Polymers 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004695 Polyether sulfone Substances 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229920001643 poly(ether ketone) Polymers 0.000 description 1
- 229920001230 polyarylate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920006393 polyether sulfone Polymers 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 150000003609 titanium compounds Chemical class 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、磁気記録媒体に関し、特に合成樹脂よりなる
基板を用いた磁気記録媒体に係わる。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a magnetic recording medium, and particularly to a magnetic recording medium using a substrate made of synthetic resin.
［従来の技術］
従来、磁気記録媒体としては、表面をアルマイト処理ま
たは金属メツキし、さらにその表面を鏡面研磨仕上げし
たアルミニウム合金からなる基板上にＣｏ、酸化鉄等か
らなる磁気記録層が形成された磁気記録媒体が知られて
いる。[Prior Art] Conventionally, in magnetic recording media, a magnetic recording layer made of Co, iron oxide, etc. is formed on a substrate made of an aluminum alloy whose surface is alumite-treated or metal-plated, and whose surface is mirror-polished. Magnetic recording media are known.
これに対して、近年、軽量化が強く要請されており、か
かる観点から、アルミニウム合金よりも軽量で、かつ加
工性の良好な合成樹脂からなる基板を用いた磁気記録媒
体が試みられている。On the other hand, in recent years, there has been a strong demand for weight reduction, and from this point of view, attempts have been made to develop magnetic recording media using substrates made of synthetic resins that are lighter than aluminum alloys and have better workability.
しかし、このような合成樹脂からなる基板を用いた磁気
記録媒体においては、合成樹脂からなる基板が従来のア
ルミニウム合金からなる基板に比べて、その表面の硬度
が低いため、磁気ディスク装置に搭載して使用し、スタ
ート・ストップを繰り返している間にヘッドクラッシュ
を起こし、磁気記録層が損傷する危惧がある。すなわち
Ｃ８Ｓ耐久性に関して十分な信頼性が得られなかったり
、基板が合成樹脂からなるため、製造工程中に静電気を
帯電して雰囲気中の塵を吸引して磁気記録媒体として信
号欠陥が発生したり、磁気ディスク装置に搭載して使用
中に同様に帯電してノイズが発生したりして、磁気記録
媒体や磁気ヘッドに損傷が生じる等々の課題を有してい
る。However, in magnetic recording media using such substrates made of synthetic resin, the surface hardness of the substrate made of synthetic resin is lower than that of conventional substrates made of aluminum alloy, so it is difficult to install them in magnetic disk drives. There is a risk that a head crash may occur during repeated start and stop operations, damaging the magnetic recording layer. In other words, sufficient reliability in terms of C8S durability cannot be obtained, and because the substrate is made of synthetic resin, static electricity is charged during the manufacturing process and dust in the atmosphere is attracted, causing signal defects as a magnetic recording medium. However, when used in a magnetic disk device, the magnetic disk is similarly charged and generates noise, causing damage to the magnetic recording medium and the magnetic head.
これらの課題のうち、基板の表面硬度を改良するため、
特開昭６１−１８７１１７号公報記載の発明ではプラス
チック基板上にチタンを被覆することが検討されている
。Among these issues, to improve the surface hardness of the substrate,
In the invention described in JP-A-61-187117, coating titanium on a plastic substrate is considered.
Ｕ発明が解決しようとする課題］
しかし、特開昭６１〜１８７１１７号公報記載の発明で
は、プラスチック基板−トにチタン、チタン合金または
チタン化合物を直接、あるいは酸化シリコンまたは酸化
アルミニウムを介在させて被覆することを１２案してい
るが、上記の被覆処理により基板の表面硬度はかなり改
善されるが、絶縁性の磁気記録層を形成した磁気記録媒
体となした場合には信号欠陥が発生したり、磁気ディス
ク装置に搭載して高速回転させると空気との摩擦で磁気
記録媒体が帯電し、磁気ヘッドとの間で放電を起こした
りして磁気記録媒体や磁気ヘッドの損傷を与えたりする
ことがある。Problems to be Solved by the Invention] However, in the invention described in JP-A-61-187117, a plastic substrate is coated with titanium, a titanium alloy, or a titanium compound directly or with silicon oxide or aluminum oxide interposed therebetween. Although the surface hardness of the substrate is considerably improved by the above-mentioned coating treatment, signal defects may occur if it is used as a magnetic recording medium with an insulating magnetic recording layer formed thereon. When installed in a magnetic disk drive and rotated at high speed, the magnetic recording medium becomes charged due to friction with the air, causing discharge between the magnetic head and the magnetic head, which can damage the magnetic recording medium and the magnetic head. be.
本発明は、上記従来の技術の課題を解決して、Ｃ８Ｓ耐
久性にすぐれ、かつ信号欠陥が殆ど無く、高速回転中に
磁気記録媒体や磁気ヘッドの損傷が殆ど発生しない磁気
記録媒体を提供することを目的とする。The present invention solves the above problems of the conventional technology and provides a magnetic recording medium that has excellent C8S durability, has almost no signal defects, and causes almost no damage to the magnetic recording medium or magnetic head during high-speed rotation. The purpose is to
［課題を解決するための手段］
本発明の要旨は、合成樹脂からなる基板」−に磁気記録
層が形成された磁気記録媒体において、前記合成樹脂か
らなる基板と前記磁気記録層との間に、Ｃｒ、Ｏ，から
なる層を介在せしめることにある。[Means for Solving the Problems] The gist of the present invention is to provide a magnetic recording medium in which a magnetic recording layer is formed on a substrate made of synthetic resin, in which a magnetic recording layer is formed between the substrate made of synthetic resin and the magnetic recording layer. , Cr, and O.
本発明においては、ＣｒｚＯ＝からなる層の厚さとして
は１μ以上であることが好ましいａＣｒ８０、からなる
層の厚さを１μ以上とした場合には、膜として必要な硬
度がより一層高くなり、Ｃ８Ｓ耐久性が一段と向上する
。In the present invention, the thickness of the layer made of CrzO= is preferably 1 μ or more, and when the thickness of the layer made of aCr80 is made 1 μ or more, the hardness required as a film becomes even higher, C8S durability is further improved.
また、本発明において用いる合成樹脂としては、例えば
ポリエーテルイミド、ポリエーテルサルホン、ポリフェ
ニレンサルファイド、ボリアリレート、ポリカーボネー
ト、ポリイミド、ポリエーテルケトン等を挙げることが
できるが、これらに限定するものではなく、耐熱性にす
ぐれた合成樹脂であればよい。さらに、必要に応じて上
記合成樹脂中に無機質充填材、例えばチタン酸カリウム
ウィスカ、炭素繊維、ガラスピーズ、セラミック粉末、
カーボン、マイカ等を適宜添加してもよい。In addition, examples of the synthetic resin used in the present invention include, but are not limited to, polyetherimide, polyethersulfone, polyphenylene sulfide, polyarylate, polycarbonate, polyimide, polyetherketone, etc. Any synthetic resin with excellent heat resistance may be used. Furthermore, if necessary, inorganic fillers may be added to the synthetic resin, such as potassium titanate whiskers, carbon fibers, glass beads, ceramic powder, etc.
Carbon, mica, etc. may be added as appropriate.
なお、合成樹脂からなる基板は、２層以上の多層構造で
もよい。Note that the substrate made of synthetic resin may have a multilayer structure of two or more layers.
また、本発明において、Ｃｒ、Ｏ，からなる層は、真空
蒸着法、スパッタリング法、イオンブレーティング法等
いずれの方法でも形成することが。Further, in the present invention, the layer made of Cr and O can be formed by any method such as a vacuum evaporation method, a sputtering method, or an ion blasting method.
できる。can.
また、本発明において、磁気記録層はＣｏ等の金属薄膜
磁性層、あるいは磁性粉末（例えば、酸化鉄、炭化鉄等
）と合成樹脂バインダからなる塗布型の磁性層等いずれ
の磁性層でもよい。Further, in the present invention, the magnetic recording layer may be any magnetic layer such as a metal thin film magnetic layer made of Co or the like, or a coated magnetic layer made of magnetic powder (eg, iron oxide, iron carbide, etc.) and a synthetic resin binder.
［作用］
本発明においては、基板に用いる合成樹脂よりも導電性
がよく、硬度が高いＣｒ、Ｏ，からなる層を基板と磁気
記録層との間に介在せしめることにより、基板表面の帯
電を抑えることができ、したがって塵等を基板表面に付
着することがなく、形成された磁気記録層の信号欠陥が
大幅に減少し、磁気記録媒体や磁気ヘッドの損傷の発生
も防ぐことができる。さらに、磁気記録媒体の表面の硬
度が高くなり、その結果、表面の耐摩耗性が向上しＣ３
Ｓ耐久性が向上する。[Function] In the present invention, a layer made of Cr and O, which has better conductivity and higher hardness than the synthetic resin used for the substrate, is interposed between the substrate and the magnetic recording layer, thereby reducing the charge on the surface of the substrate. Therefore, it is possible to prevent dust and the like from adhering to the substrate surface, significantly reducing signal defects in the formed magnetic recording layer, and preventing damage to the magnetic recording medium and magnetic head. Furthermore, the hardness of the surface of the magnetic recording medium increases, resulting in improved surface wear resistance and C3
S Durability is improved.
［実施例１
以下、本発明を実施例に基づいてさらに詳細に説明する
。[Example 1] Hereinafter, the present invention will be explained in more detail based on Examples.
ポリエーテルイミド樹脂を用い、射出成形により、厚み
１．９ｍｍ、内径４０ｍｍ、外径１３０ｍｍの基板を成
形した。この基板に、ＣｒｚＯｔターゲットを用いて、
ＲＦマグネトロン方式のスパッタリングを行いＣｒ、Ｏ
，からなる層を表−１に示したように４種類の膜厚で形
成した。A substrate having a thickness of 1.9 mm, an inner diameter of 40 mm, and an outer diameter of 130 mm was molded by injection molding using polyetherimide resin. Using a CrzOt target on this substrate,
Cr, O was sputtered using the RF magnetron method.
, were formed with four different thicknesses as shown in Table 1.
次いで、それらの表面に、ＤＣ方式のスパッタリングに
よりクロム層、コバルト合金層、カーボン層をそれぞれ
Ｏ２２μ、０．０８μ、０．０３μの厚みで形成し、磁
気記録層を作成した。さらに、この上にスピンコード法
により潤滑剤を塗布して磁気記録媒体を作成した。Next, a chromium layer, a cobalt alloy layer, and a carbon layer were formed on these surfaces by DC sputtering to a thickness of O22μ, 0.08μ, and 0.03μ, respectively, to create a magnetic recording layer. Further, a lubricant was applied thereon by a spin code method to produce a magnetic recording medium.
以下余白
表
表−２
また、比較例として、ポリエーテルイミド樹脂からなる
基板上に直接クロム層、コバルト合金層、カーボン層、
潤滑層を、上記実施例の場合と同様の方法で同じ膜厚で
形成した磁気記録媒体（以下、比較例という）を作成し
た。Margin Table Table-2 Below, as a comparative example, a chromium layer, a cobalt alloy layer, a carbon layer, a chromium layer, a cobalt alloy layer, a carbon layer,
A magnetic recording medium (hereinafter referred to as a comparative example) was prepared in which a lubricating layer was formed with the same thickness using the same method as in the above example.
これらの磁気記録媒体につき、３３７０型ヘツド（トラ
ック幅２０μ、ミニモノシリツクヘッド）を用いて、信
号欠陥、Ｃ３Ｓ耐久性をそれぞれ測定した。その結果を
表−２、表−３に示した。These magnetic recording media were measured for signal defects and C3S durability using a 3370 type head (track width 20 μm, mini monolithic head). The results are shown in Table-2 and Table-3.
表−３においては、Ｃ３Ｓ耐久性の各回数における出力
の低下率を％で示した。In Table 3, the rate of decrease in output for each number of C3S durability is shown in %.
以下余白
表−２から明らかなように、Ｃｒ ｚ Ｏ３からなる層
の介在により、信号欠陥の発生は皆無になり、著しく改
良されていることがわかる。As is clear from Margin Table 2 below, the presence of the layer made of Cr z O3 eliminates the occurrence of signal defects, indicating a significant improvement.
表−３
表−３から明らかなように、ＣｒｚＯｓからなる層の介
在により、Ｃ５Ｓ耐久性は著しく向上することがわかる
。特にＣｒｚＯ＝からなる層を１μ以上の膜厚みで形成
するとＣ５Ｓ耐久試験における出力の低下は無くなり、
著しい改良がなされていることがわかる。Table 3 As is clear from Table 3, the presence of the layer made of CrzOs significantly improves the C5S durability. In particular, when a layer consisting of CrzO= is formed with a thickness of 1μ or more, there is no decrease in output in the C5S durability test,
It can be seen that significant improvements have been made.
また、本実施例では、ＣｒｚＯｉからなる層と基板およ
び磁気記録層との間の密着性は良好でありクラックの発
生は全く見られなかった。Furthermore, in this example, the adhesion between the layer made of CrzOi, the substrate, and the magnetic recording layer was good, and no cracks were observed at all.
［効果］
以上のように、本発明によれば、合成樹脂からなる基板
と磁気記録層との間にＣｒｚＯ＝からなる層を介在させ
ることにより、導電性が高くなり、帯電防止効果が生じ
、信号欠陥の発生が殆ど無くなる。さらに、ＣｒｔＯ３
からなる層の介在により、硬度も高くなり、Ｃ３Ｓ耐久
性が著しく向上し、磁気記録媒体や磁気ヘッドの損傷の
発生を防止できするという効果を奏することができる。[Effects] As described above, according to the present invention, by interposing a layer made of CrzO= between a substrate made of a synthetic resin and a magnetic recording layer, conductivity is increased and an antistatic effect is produced. The occurrence of signal defects is almost eliminated. Furthermore, CrtO3
The presence of the layer made of C3S increases the hardness, significantly improves C3S durability, and prevents damage to the magnetic recording medium and magnetic head.
また、Ｃｒ、Ｏ，からなる層は安定であり、上記の効果
は長期間にわたり安定的に得られる。Furthermore, the layer made of Cr and O is stable, and the above effects can be stably obtained over a long period of time.
Claims (1)
た磁気記録媒体において、前記合成樹脂からなる基板と
前記磁気記録層との間に、Ｃｒ＿２Ｏ＿３からなる層を
介在せしめたことを特徴とする磁気記録媒体。(1) A magnetic recording medium having a magnetic recording layer formed on a substrate made of synthetic resin, characterized in that a layer made of Cr_2O_3 is interposed between the substrate made of synthetic resin and the magnetic recording layer. magnetic recording media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31598088A JPH02161609A (en) | 1988-12-13 | 1988-12-13 | Magnetic recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31598088A JPH02161609A (en) | 1988-12-13 | 1988-12-13 | Magnetic recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02161609A true JPH02161609A (en) | 1990-06-21 |
Family
ID=18071892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31598088A Pending JPH02161609A (en) | 1988-12-13 | 1988-12-13 | Magnetic recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02161609A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1760699A1 (en) * | 2005-08-30 | 2007-03-07 | Konica Minolta Opto, Inc. | Substrate for magnetic information recording medium, and producing method of substrate for magnetic information recording medium |
-
1988
- 1988-12-13 JP JP31598088A patent/JPH02161609A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1760699A1 (en) * | 2005-08-30 | 2007-03-07 | Konica Minolta Opto, Inc. | Substrate for magnetic information recording medium, and producing method of substrate for magnetic information recording medium |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4074016A (en) | Magnetic record carrier | |
| JPH02161609A (en) | Magnetic recording medium | |
| JPH0192975A (en) | Magnetic head | |
| JPH05143972A (en) | Metal thin film magnetic recording medium and its production | |
| JP2005092991A (en) | Magnetic recording medium | |
| JPH02132630A (en) | Magnetic recording medium | |
| JPS62103823A (en) | Magnetic disk | |
| JPS61210521A (en) | Production of magnetic disk | |
| JPH0262714A (en) | Magnetic recording medium | |
| JPS61222024A (en) | Magnetic disk | |
| JPS61220119A (en) | Magnetic disk | |
| JPH08337873A (en) | Sputtering method | |
| JPS62209719A (en) | Magnetic recording medium | |
| JPH0262713A (en) | Magnetic recording medium | |
| JPH0294111A (en) | Magnetic recording medium | |
| JPS61208620A (en) | Magnetic disk | |
| JP2624473B2 (en) | Manufacturing method of magnetic head | |
| CN116334553A (en) | Coating method for hard disk drive parts | |
| JPH02130723A (en) | Production of magnetic recording medium | |
| JPH02189717A (en) | Magnetic recording medium and production thereof | |
| JPH02208819A (en) | Magnetic recording medium | |
| JPH04285727A (en) | Magnetic disk device | |
| JPH033115A (en) | Magnetic recording medium | |
| JP2005129207A (en) | Magnetic recording medium and its manufacturing method | |
| JPH01271910A (en) | Magnetic recording medium |