JPH0518175B2 - - Google Patents
Info
- Publication number
- JPH0518175B2 JPH0518175B2 JP60220043A JP22004385A JPH0518175B2 JP H0518175 B2 JPH0518175 B2 JP H0518175B2 JP 60220043 A JP60220043 A JP 60220043A JP 22004385 A JP22004385 A JP 22004385A JP H0518175 B2 JPH0518175 B2 JP H0518175B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic disk
- reinforcing material
- coating
- magnetic powder
- 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
- 239000011248 coating agent Substances 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 21
- 239000006247 magnetic powder Substances 0.000 claims description 20
- 239000012779 reinforcing material Substances 0.000 claims description 19
- 239000003973 paint Substances 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 5
- 239000000758 substrate Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 8
- 239000010687 lubricating oil Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 4
- 238000004528 spin coating Methods 0.000 description 3
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/74—Record carriers characterised by the form, e.g. sheet shaped to wrap around a drum
- G11B5/82—Disk carriers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
- G11B5/708—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer characterised by addition of non-magnetic particles to the layer
Landscapes
- Magnetic Record Carriers (AREA)
- Paints Or Removers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】
〔発明の利用分野〕
本発明は磁気デイスクに係り、特に電気特性、
塗膜強度共に向上させるのに好適な磁気デイスク
の塗膜面構造に関する。[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic disk, and particularly relates to electric characteristics,
The present invention relates to a coating surface structure of a magnetic disk suitable for improving both coating strength.
従来、磁気デイスクの塗膜強度を向上させるた
めには、塗膜中の補強材の量を多くしたり、塗膜
表面に塗布する液体潤滑剤の量を増加させたりし
ている。
Conventionally, in order to improve the strength of the coating film of a magnetic disk, the amount of reinforcing material in the coating film is increased, or the amount of liquid lubricant applied to the surface of the coating film is increased.
第４図に従来の磁気デイスクの塗膜面構造を示
す。バインダ３の中に磁性粉２と補強材４が混入
されており、補強材４はバインダ３の中に均一に
分散されているが、補強材４が蓄積している電荷
により補強材４の周りに磁性粉２が集まり磁性粉
２の配列が乱れている。これはノイズ発生の原因
となり電気特性低下の要因となる。従つて補強材
の添加量を減らして、塗膜強度を向上させる検討
が盛んに行われている。この種に関連するものに
は特開昭57−200935号等が挙げられる。 FIG. 4 shows the structure of the coating surface of a conventional magnetic disk. Magnetic powder 2 and reinforcing material 4 are mixed in the binder 3, and the reinforcing material 4 is uniformly dispersed in the binder 3, but the surrounding area of the reinforcing material 4 is caused by the electric charge accumulated in the reinforcing material 4. The magnetic powder 2 gathers in the area, and the arrangement of the magnetic powder 2 is disordered. This causes noise generation and causes deterioration of electrical characteristics. Therefore, studies are actively being conducted to improve the strength of the coating film by reducing the amount of reinforcing material added. Documents related to this species include JP-A No. 57-200935.
一方液体潤滑剤の塗布量を増加させた場合に
は、デイスク面に磁気ヘツドが粘着し、磁気ヘツ
ドの破損の原因となる。しかしながら磁気ヘツド
と磁気デイスクの摺動による摩耗や破損を防止す
るためには、液体潤滑剤は必要であり、従つて液
体潤滑剤の塗布量を多くし、かつヘツドの粘着が
生じないような塗膜面構造が要求されるところで
ある。 On the other hand, if the amount of liquid lubricant applied is increased, the magnetic head will stick to the disk surface, causing damage to the magnetic head. However, in order to prevent wear and damage caused by sliding between the magnetic head and magnetic disk, liquid lubricant is necessary. Therefore, it is necessary to apply a large amount of liquid lubricant and to prevent the head from sticking. This requires a membrane structure.
本発明の目的は、電気特性および塗膜強度共に
優れた磁気デイスクを提供することである。
An object of the present invention is to provide a magnetic disk with excellent electrical properties and coating strength.
本発明の特徴とするところは、磁気デイスクの
塗膜面に、ビツトエラーが発生しない程度の溝を
設け、この溝の中に補強材を保有させることにあ
る。これにより、電気特性を低下させることな
く、補強材の添加量を増加させて塗膜強度を向上
させることができる。
A feature of the present invention is that grooves are provided on the coated surface of the magnetic disk to a degree that does not cause bit errors, and a reinforcing material is held in the grooves. Thereby, the amount of reinforcing material added can be increased and the strength of the coating film can be improved without deteriorating the electrical properties.
以下本発明の一実施例を第１図〜第３図を参照
して詳細に説明する。
An embodiment of the present invention will be described in detail below with reference to FIGS. 1 to 3.
本実施例では磁性塗料として特公昭57−40566
号に記載のものを使用する。すなわち、エポキシ
樹脂45重量部をミクロヘキサノン230重量部で溶
解した溶液に、磁性粉（γ−Fe2O3）100重量部、
α−Al2O310重量部を加えてボールミル混練を７
日間行つて磁性粉を分散させた後、フエノール樹
脂45重量部、ビニール樹脂の25％のミクロヘキサ
ノン溶液350重量部を添加し調合した磁性塗料で
ある。この磁性塗料は、安定な分散状態として磁
性粉粒子を数十ケ均一な束状に分散させる特徴が
ある。 In this example, the magnetic paint used was Special Publication No. 57-40566
Use the one listed in the issue. That is, 100 parts by weight of magnetic powder (γ-Fe 2 O 3 ),
Add 10 parts by weight of α-Al 2 O 3 and knead in a ball mill for 7
After dispersing the magnetic powder for several days, 45 parts by weight of phenol resin and 350 parts by weight of a 25% vinyl resin solution in microhexanone were added to create a magnetic paint. This magnetic coating material has the characteristic that magnetic powder particles are dispersed in a uniform bundle of several tens of particles in a stable dispersion state.
この磁性塗料をアルミ基板１上にスピンコーテ
イングすると、第１図ａに示すように塗料は磁性
粉粒子２が数十ケ均一な束状で分散しているため
にスピンコーテイングによりその束を崩す事なく
遠心力により振り切られ、束と束の間にすき間が
生じ、そのすき間に補強材４が存在する状態とな
る。 When this magnetic paint is spin-coated onto an aluminum substrate 1, as shown in Figure 1a, the paint has tens of magnetic powder particles 2 dispersed in the form of uniform bundles, so the spin coating breaks up the bundles. The bundles are shaken off by the centrifugal force, and a gap is created between the bundles, and the reinforcing material 4 is present in the gap.
スピンコーテイング後、第２図に示すような磁
場配向機により磁場配向を行う。第２図ａは平面
図、ｂは側面図、ｃは磁石の配列を説明するため
に磁気デイスクを展開した図である。磁気デイス
ク７はスピンドル６装着され、磁気デイスク７の
面には磁石５が永久磁石を２本１組で90°間隔で
４組配置される。磁石５の磁気デイスク７からの
距離は15mmである。磁石５の極性はNS／NS−
NS／NSと異なる極性を交互に配置する。スピン
ドル６を回転数10〜40rpmで回転させ、磁気デイ
スク７を矢印８方向に回転させて磁場配向処理を
行う。 After spin coating, magnetic field orientation is performed using a magnetic field orientation machine as shown in FIG. 2A is a plan view, FIG. 2B is a side view, and FIG. 2C is an exploded view of the magnetic disk to explain the arrangement of magnets. A spindle 6 is attached to the magnetic disk 7, and four sets of two permanent magnets 5 are arranged on the surface of the magnetic disk 7 at 90° intervals. The distance of the magnet 5 from the magnetic disk 7 is 15 mm. The polarity of magnet 5 is NS/NS-
Alternate NS/NS and different polarities. The spindle 6 is rotated at a rotation speed of 10 to 40 rpm, and the magnetic disk 7 is rotated in the direction of arrow 8 to perform magnetic field orientation processing.
第３図は配向処理後の磁性粉粒子２の状態を示
すが、NS／NS−NS／NSと磁石を配置すること
によりＡ点とＢ点では隣り合う極性が異極である
ため磁性粉に対して反発が起らずに磁石に引きつ
けられるため磁石粉２とバインダ３の束が引き伸
ばされる形となり、引き伸ばされた磁性粉２の束
が連がり帯状になり、スピンコーテイングにより
生じたすきま９が溝になる。 Figure 3 shows the state of the magnetic powder particles 2 after the orientation treatment. By arranging the magnets as NS/NS-NS/NS, the adjacent polarities at points A and B are different, so the magnetic powder becomes On the other hand, since it is attracted to the magnet without repulsion, the bundle of magnetic powder 2 and binder 3 is stretched, and the stretched bundle of magnetic powder 2 becomes a continuous band shape, and the gap 9 caused by spin coating is removed. Become a groove.
第５図に本実施例のプロセスにて作成した仕上
後の塗膜面の走査形電子顕微鏡（倍率2000倍）写
真を示す。尚、紙面の上下方向は、デイスクの半
径方向と一致する。写真より補強材４が溝９の中
に集中して磁性粉２の配列中にほとんど存在せず
磁性粉の配列を乱していない事がわかる。これは
磁性粉２と補強材４の撹拌動作がないため、磁性
粉２と補強材４が混じり合わず、補強材４は溝９
の間にはさまれるような状態で存在するからであ
る。 FIG. 5 shows a scanning electron microscope (2000x magnification) photograph of the finished coating surface created by the process of this example. Note that the vertical direction of the paper surface coincides with the radial direction of the disk. It can be seen from the photograph that the reinforcing material 4 is concentrated in the groove 9 and hardly exists in the arrangement of the magnetic powder 2, and does not disturb the arrangement of the magnetic powder. This is because there is no stirring action between the magnetic powder 2 and the reinforcing material 4, so the magnetic powder 2 and the reinforcing material 4 do not mix together, and the reinforcing material 4 is in the groove 9.
This is because they exist in a state where they are caught in between.
溝９の幅は、ビツトエラーを考慮してトラツク
幅（30〜40μｍ）の10％以下（１〜2μｍ）とし、
深さは信頼性の面から媒体厚さの50％〜100％が
適当である。 The width of the groove 9 should be 10% or less (1 to 2 μm) of the track width (30 to 40 μm), taking into account bit errors.
From the viewpoint of reliability, the appropriate depth is 50% to 100% of the medium thickness.
第６図は従来の磁気デイスクと本実施例の磁気
デイスクの特性を比較するもので、横軸に再生時
におけるＳ／Ｎ比、縦軸に塗膜強度を評価する高
速摺動テストの結果を示す。塗膜強度（塗膜が破
壊に至るまでの時間）は従来に比べて約３倍向上
し、再生信号におけるＳ／Ｎ比は約1.5dB向上し
ている。 Figure 6 compares the characteristics of the conventional magnetic disk and the magnetic disk of this example. The horizontal axis shows the S/N ratio during playback, and the vertical axis shows the results of a high-speed sliding test to evaluate the coating strength. show. The strength of the paint film (the time it takes for the paint film to break down) is approximately three times higher than before, and the S/N ratio of the reproduced signal is approximately 1.5 dB higher.
このように本実施例によれば、補強材は溝の中
に存在し、磁性粉が配列している中には存在しな
いので、補強材の添加量を増しても電気特性は低
下しない。そして補強材の添加量を増すことがで
きるので塗膜強度は飛躍的に向上する。さらに塗
膜面に付された液体潤滑剤は溝の中に浸透するの
で、塗布量を増してもヘツドの粘着現象は増えな
い。また、磁気ヘツドが塗膜に接触した際、溝が
あるためにヘツドとの接触面積が減り、摩擦抵抗
による発熱を減少させることができるし、接触の
際に発生した切粉等の逃げ場とすることもでき
る。 As described above, according to this embodiment, the reinforcing material is present in the grooves and not in the array of magnetic powder, so that even if the amount of reinforcing material added is increased, the electrical characteristics do not deteriorate. Since the amount of reinforcing material added can be increased, the strength of the coating film can be dramatically improved. Furthermore, since the liquid lubricant applied to the coating surface permeates into the grooves, the head sticking phenomenon does not increase even if the amount of application is increased. In addition, when the magnetic head comes into contact with the paint film, the grooves reduce the contact area with the head, reducing heat generation due to frictional resistance, and providing an escape area for chips generated during contact. You can also do that.
以上の説明の如く本発明によれば、電気特性お
よび塗膜強度共に優れた磁気デイスクを得ること
ができる。
As described above, according to the present invention, a magnetic disk having excellent electrical properties and coating strength can be obtained.
第１図は本発明の一実施例による塗膜面の状態
を示す図で、ａは磁性塗料塗布後の塗膜面状態
図、ｂは磁場配向後の塗膜面状態図、第２図は磁
場配向を説明するための図で、ａは平面図、ｂは
側面図、ｃは磁気デイスクを直線に展開した図、
第３図は本発明の一実施例における磁場配向時の
磁性粉の挙動を説明するための図、第４図は従来
例の塗膜面構造を示す図、第５図は本発明の一実
施例による塗膜面の構造を示す図であり、ａは写
真図、ｂは一部拡大図、ｃはＣ−Ｃ線断面図、第
６図は従来例と本発明の一実施例による磁気デイ
スクの塗膜強度とＳ／Ｎ比を示す図である。
１……アルミ基板、２……磁性粉、３……バイ
ンダ、４……補強材、５……磁石、６……スピン
ドル、７……磁気デイスク、９……溝。
FIG. 1 is a diagram showing the state of the coated film surface according to an embodiment of the present invention, where a is a state diagram of the coated film surface after applying the magnetic paint, b is a state diagram of the coated film surface after magnetic field orientation, and FIG. Diagrams for explaining magnetic field orientation, a is a plan view, b is a side view, c is a diagram of the magnetic disk developed in a straight line,
Fig. 3 is a diagram for explaining the behavior of magnetic powder during magnetic field orientation in an embodiment of the present invention, Fig. 4 is a diagram showing the coating surface structure of a conventional example, and Fig. 5 is an embodiment of the present invention. 6 is a diagram showing the structure of a coating surface according to an example, in which a is a photograph, b is a partially enlarged view, c is a sectional view taken along the line C-C, and FIG. 6 is a magnetic disk according to a conventional example and an embodiment of the present invention. It is a figure showing coating film strength and S/N ratio of. DESCRIPTION OF SYMBOLS 1... Aluminum substrate, 2... Magnetic powder, 3... Binder, 4... Reinforcement material, 5... Magnet, 6... Spindle, 7... Magnetic disk, 9... Groove.
Claims (1)
入させた磁性塗料を塗布してなる磁気デイスクに
おいて、磁性塗料を塗布して形成された塗膜に設
けられた溝と、該溝に前記補強材が保有されてい
ることを特徴とする磁気デイスク。 ２ 前記溝の幅は、情報トラツク幅の10％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
の磁気デイスク。 ３ 前記溝の深さは、塗膜の厚さの50〜100％で
あることを特徴とする特許請求の範囲第１項若し
くは第２項記載の磁気デイスク。 ４ 前記補強材は、前記磁性粉の０乃至20重量％
混入されていることを特徴とする特許請求の範囲
第１項乃至第３項いずれかに記載の磁気デイス
ク。[Scope of Claims] 1. In a magnetic disk formed by coating a substrate with a magnetic paint in which magnetic powder and reinforcing material are mixed in a binder, grooves formed in the coating film formed by applying the magnetic paint and a magnetic disk characterized in that the reinforcing material is held in the groove. 2. The magnetic disk according to claim 1, wherein the width of the groove is 10% or less of the information track width. 3. The magnetic disk according to claim 1 or 2, wherein the depth of the groove is 50 to 100% of the thickness of the coating film. 4 The reinforcing material accounts for 0 to 20% by weight of the magnetic powder.
A magnetic disk according to any one of claims 1 to 3, characterized in that the magnetic disk is mixed with a magnetic disk.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60220043A JPS6280827A (en) | 1985-10-04 | 1985-10-04 | Magnetic disc |
| CN198686106834A CN86106834A (en) | 1985-10-04 | 1986-10-02 | Disk and manufacture method thereof |
| DE19863633590 DE3633590A1 (en) | 1985-10-04 | 1986-10-02 | Magnetic disc and process for its production |
| KR1019860008308A KR910004633B1 (en) | 1985-10-04 | 1986-10-04 | Magnetic disk and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60220043A JPS6280827A (en) | 1985-10-04 | 1985-10-04 | Magnetic disc |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6280827A JPS6280827A (en) | 1987-04-14 |
| JPH0518175B2 true JPH0518175B2 (en) | 1993-03-11 |
Family
ID=16745028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60220043A Granted JPS6280827A (en) | 1985-10-04 | 1985-10-04 | Magnetic disc |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS6280827A (en) |
| KR (1) | KR910004633B1 (en) |
| CN (1) | CN86106834A (en) |
| DE (1) | DE3633590A1 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5447606A (en) * | 1977-09-22 | 1979-04-14 | Hitachi Ltd | Production of magnetic recording media |
| JPS5990234A (en) * | 1982-11-15 | 1984-05-24 | Hitachi Ltd | Magnetic disk |
-
1985
- 1985-10-04 JP JP60220043A patent/JPS6280827A/en active Granted
-
1986
- 1986-10-02 DE DE19863633590 patent/DE3633590A1/en active Granted
- 1986-10-02 CN CN198686106834A patent/CN86106834A/en active Pending
- 1986-10-04 KR KR1019860008308A patent/KR910004633B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| KR870004409A (en) | 1987-05-09 |
| DE3633590C2 (en) | 1991-02-14 |
| CN86106834A (en) | 1987-04-08 |
| DE3633590A1 (en) | 1987-04-16 |
| JPS6280827A (en) | 1987-04-14 |
| KR910004633B1 (en) | 1991-07-08 |
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