JPH0370855B2 - - Google Patents
Info
- Publication number
- JPH0370855B2 JPH0370855B2 JP58168590A JP16859083A JPH0370855B2 JP H0370855 B2 JPH0370855 B2 JP H0370855B2 JP 58168590 A JP58168590 A JP 58168590A JP 16859083 A JP16859083 A JP 16859083A JP H0370855 B2 JPH0370855 B2 JP H0370855B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic disk
- pole
- radial direction
- manufacturing apparatus
- 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
- 239000000758 substrate Substances 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 16
- 238000000576 coating method Methods 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 14
- 238000004519 manufacturing process Methods 0.000 claims description 13
- 239000003973 paint Substances 0.000 claims description 12
- 230000004907 flux Effects 0.000 claims description 7
- 239000006247 magnetic powder Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000004528 spin coating Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Description
【発明の詳細な説明】
(a) 発明の技術分野
本発明は磁気デイスク媒体の製造装置に係り、
特に磁気デイスク基盤に磁性塗料をスピンコート
法によりコーデング時又はトーデング直後、均一
に薄い塗膜を得るために磁気デイスク基盤を高速
回転する、所謂振り切り工程に於いて、磁気デイ
スク基盤に与える磁界を形成する為の磁気デイス
ク媒体製造装置の磁極配置方法に関する。[Detailed Description of the Invention] (a) Technical Field of the Invention The present invention relates to an apparatus for manufacturing a magnetic disk medium,
In particular, the magnetic field applied to the magnetic disk substrate is formed during the so-called shake-off process in which the magnetic disk substrate is rotated at high speed in order to obtain a uniformly thin coating, during or immediately after coating the magnetic paint on the magnetic disk substrate using the spin coating method. The present invention relates to a method for arranging magnetic poles in a magnetic disk medium manufacturing apparatus.
(b) 従来技術と問題点
磁気デイスク装置は計算機システムの記憶装置
として用いられ、その磁気デイスク装置の記憶媒
体は磁気デイスクである。磁気デイスクは超仕上
げされたアルミニウム等の基盤に磁性粉を含む塗
料がスピンコート法により塗布され、磁界の中で
前記基盤を回転して塗料を乾燥して表面を研磨す
ることで平滑にして完成されている。そして磁性
粉としては、γ−Fe2O3が一般に用いられる。近
年磁気デイスク媒体に対する情報の記録密度を向
上させることが強く要求されている。記録密度を
向上させる為には塗料の厚みを薄くする必要があ
るが、塗料の厚みが薄くなる程磁性粉が極度に少
ない部分やピンホール等の欠陥が発生し易い傾向
があり、塗料のコーテングを行う際に磁界をかけ
ながら行う、又はコーテング直後の振り切り工程
で磁界をかけながら行うことで均一な塗膜を得る
ことが可能であることが知られている。しかし均
一な塗膜を得るためには前記磁界は磁気デイスク
基盤に垂直な方向で半径方向に均一な磁界分布で
あることが必要である。例えば磁気デイスク基盤
の半径方向に漏洩磁界があると塗料がその漏洩磁
界により偏つて分布し、塗膜の厚みにむらが発生
する。(b) Prior Art and Problems A magnetic disk device is used as a storage device in a computer system, and the storage medium of the magnetic disk device is a magnetic disk. Magnetic disks are made by applying paint containing magnetic powder to a super-finished aluminum base using a spin coating method, then rotating the base in a magnetic field to dry the paint and polishing the surface to make it smooth. has been done. As the magnetic powder, γ-Fe 2 O 3 is generally used. In recent years, there has been a strong demand to improve the recording density of information on magnetic disk media. In order to improve the recording density, it is necessary to reduce the thickness of the paint, but as the thickness of the paint becomes thinner, defects such as pinholes and areas with extremely little magnetic powder tend to occur. It is known that it is possible to obtain a uniform coating film by applying a magnetic field during coating, or by applying a magnetic field during the shaking-off process immediately after coating. However, in order to obtain a uniform coating, it is necessary that the magnetic field has a uniform distribution in the radial direction in a direction perpendicular to the magnetic disk substrate. For example, if there is a leakage magnetic field in the radial direction of the magnetic disk base, the paint will be unevenly distributed due to the leakage magnetic field, causing unevenness in the thickness of the paint film.
従来、上記磁気デイスク基盤に垂直な方向で半
径方向に均一な磁界分布を持つ磁界を簡易な方法
で形成する磁気デイスク媒体製造装置を得ること
が困難であつた。 Conventionally, it has been difficult to obtain a magnetic disk medium manufacturing apparatus that forms a magnetic field having a uniform magnetic field distribution in the radial direction in a direction perpendicular to the magnetic disk substrate using a simple method.
(c) 発明の目的
本発明の目的は上記欠点を除く為、磁気デイス
ク基盤に垂直は方法で半径方向に均一な磁界分布
を持つ磁界を簡易な方法で形成する磁気デイスク
媒体製造装置の磁極配置方法を提供することにあ
る。(c) Object of the invention In order to eliminate the above-mentioned drawbacks, the object of the present invention is to provide a magnetic pole arrangement for a magnetic disk medium manufacturing apparatus that forms a magnetic field with a uniform magnetic field distribution in the radial direction perpendicular to the magnetic disk substrate in a simple manner. The purpose is to provide a method.
(d) 発明の構成
本発明の構成は磁気デイスク基盤に磁性粉を含
む塗料をスピンコート法により塗布し、高速回転
して均一な厚みを持つ塗膜を形成する磁気デイス
ク媒体製造装置に於いて、磁気デイスク基盤の塗
膜形成時に磁気デイスク基盤に接近して該磁気デ
イスク基盤の半径方向に該磁気デイスク基盤の塗
膜幅を覆う範囲以上の幅を持つ長方形の磁極を設
け、磁気デイスク基盤を挟んで前記磁極に対向す
る位置及び／又は前記磁極と磁気デイスク基盤の
同一面上に於いて前記磁極に近接した位置の片方
及び／又は前記近接した位置の両方に、漏洩磁束
を吸収するための他極を配置し、磁気デイスク基
盤の半径方向に平行で間隔の等しい空隙を構成す
るようにしたものであり、上記長方形の磁極に永
久磁石を用いる場合は該永久磁石の磁気デイスク
基盤面に対向する面に高導磁率材による磁路を設
け、該磁路を介して上記他極と上記空隙を構成す
るようにしたものである。(d) Structure of the Invention The structure of the present invention is applied to a magnetic disk media manufacturing apparatus that applies a paint containing magnetic powder to a magnetic disk substrate by spin coating and rotates at high speed to form a coating film with a uniform thickness. , when forming a coating film on a magnetic disk substrate, a rectangular magnetic pole is provided in the radial direction of the magnetic disk substrate in the vicinity of the magnetic disk substrate, and has a width greater than the width of the coating film on the magnetic disk substrate; for absorbing leakage magnetic flux, at a position opposite to the magnetic pole across and/or at a position close to the magnetic pole on the same surface of the magnetic pole and the magnetic disk base, and/or at both positions close to the magnetic pole. The other poles are arranged to form an air gap parallel to the radial direction of the magnetic disk base and equally spaced, and when a permanent magnet is used for the rectangular magnetic pole, the permanent magnet faces the magnetic disk base surface. A magnetic path made of a high magnetic permeability material is provided on the surface of the magnet, and the other pole and the air gap are formed through the magnetic path.
(e) 発明の実施例
以下本発明の実施例を図面によつて説明する。
第１図は電磁石を用いた場合の磁気デイスク媒体
製造装置の磁極配置方法の一例を示す。同図ａは
上部より見た構成図で同図ｂは同図ａのＣで示す
位置における断面図を示す。磁気デイスク基盤２
は回転軸８に取り付けられて回転する。磁性塗料
が磁気デイスク基盤２の内側にコーテングされ、
該基盤２の表面を拡散する時、又は振り切り工程
で電磁石３を磁気デイスク基盤２に接近させると
共に垂直方向以外の漏洩磁束を吸収するための他
極１を同図ｂに示す如く電磁石３に接近させる。
又は他極４を接近させる。他極を配設する目的は
垂直方向以外の漏洩磁束を吸収するためである。
又は対向位置に他極５を接近させる。又は他極１
と４を同時に接近させる。又は他極１と４と５を
同時に接近させる。又は他極１と５か４と５を同
時に接近させても良い。この場合他極は高導磁率
の純鉄、パーマロイ等を用い磁路６及び７を形成
することで構成しても、他の磁石を用いても良
い。又他極の構造は同図ａに示す如く電磁石３と
磁気デイスク基盤２の半径方向で平行に空隙を形
成するようにすることが必要である。このような
磁極配置を行うと磁気デイスク基盤２に対し垂直
方向で且つ半径方向に均一な磁界分布を持つ磁界
を与えることが出来る。そして塗膜の厚みを不均
一とする半径方向の漏洩磁束は略零になる。(e) Embodiments of the invention Examples of the invention will be described below with reference to the drawings.
FIG. 1 shows an example of a method for arranging magnetic poles in a magnetic disk medium manufacturing apparatus using electromagnets. Figure a shows the configuration as seen from above, and figure b shows a sectional view at the position indicated by C in figure a. Magnetic disk base 2
is attached to the rotating shaft 8 and rotates. A magnetic paint is coated on the inside of the magnetic disk base 2,
When diffusing the surface of the base 2 or during the shaking-off process, the electromagnet 3 is brought close to the magnetic disk base 2, and the other pole 1 is brought close to the electromagnet 3 as shown in FIG. let
Or bring the other poles 4 closer together. The purpose of arranging the other pole is to absorb leakage magnetic flux in directions other than the vertical direction.
Alternatively, the other pole 5 is brought close to the opposing position. or other pole 1
and 4 approach at the same time. Or, bring the other poles 1, 4, and 5 close to each other at the same time. Alternatively, the other poles 1 and 5 or 4 and 5 may be brought close to each other at the same time. In this case, the other pole may be constructed by forming the magnetic paths 6 and 7 using pure iron, permalloy, etc. with high magnetic permeability, or other magnets may be used. The structure of the other pole must be such that a gap is formed parallel to the electromagnet 3 in the radial direction of the magnetic disk base 2, as shown in FIG. By arranging the magnetic poles in this manner, it is possible to apply a magnetic field having a uniform magnetic field distribution in the perpendicular direction and the radial direction to the magnetic disk base 2. The leakage magnetic flux in the radial direction that makes the thickness of the coating film non-uniform becomes approximately zero.
第２図は永久磁石を用いた場合の磁気デイスク
媒体製造装置の磁極配置方法の一例を示す。第１
図ｂとの相違点は電磁石３の代わりに永久磁石
３′を用いたことと該永久磁石３′の磁気デイスク
基盤２に対向する面に高導磁率材で磁路９を作成
したことである。磁路９を設けることで永久磁石
３′の磁気デイスク基盤２に対向する面の全面か
ら送出される磁力線は１０，１１で示す磁路の角
に集中し１２で示す面からは殆ど送出されない
為、漏洩磁束の発生を防止する効果がある。 FIG. 2 shows an example of a method for arranging magnetic poles in a magnetic disk medium manufacturing apparatus using permanent magnets. 1st
The difference from Figure b is that a permanent magnet 3' is used instead of the electromagnet 3, and that a magnetic path 9 is made of a high magnetic conductivity material on the surface of the permanent magnet 3' that faces the magnetic disk base 2. . By providing the magnetic path 9, the lines of magnetic force sent out from the entire surface of the permanent magnet 3' facing the magnetic disk base 2 are concentrated at the corners of the magnetic path shown by 10 and 11, and are hardly sent out from the surface shown by 12. , which has the effect of preventing the generation of leakage magnetic flux.
上記の如く、磁気デイスク媒体に垂直な磁界を
加えると、塗装材内の磁気材料（フエライト結
晶）は垂直な磁界のために垂直方向に向くととも
に、外周方向への拡散が抑制されて、拡散速度が
低下し、円盤外部に飛散しなくなり塗膜厚の均一
性が実現できるという効果がある。また、磁気材
料（フエライト結晶）は処理をしないままである
と、相互にからみあつて向きが一様にそろわない
が、垂直な磁界のために垂直方向に向くととも
に、結晶の向きがそろつてくるので、その後、乾
燥させるときの磁界の円周配向処理において、残
留磁束の増大及び均一化に有効である。 As mentioned above, when a perpendicular magnetic field is applied to the magnetic disk medium, the magnetic material (ferrite crystal) in the coating material is oriented in the vertical direction due to the perpendicular magnetic field, and diffusion in the outer circumferential direction is suppressed, resulting in a diffusion rate. This has the effect of reducing the amount of paint, preventing it from scattering outside the disk, and making it possible to achieve uniform coating thickness. In addition, if the magnetic material (ferrite crystal) is left untreated, it will become entangled with each other and its orientation will not be uniform, but due to the perpendicular magnetic field, it will become oriented perpendicularly and the orientation of the crystals will become uniform. Therefore, it is effective in increasing and making the residual magnetic flux uniform in the circumferential orientation treatment of the magnetic field during subsequent drying.
(f) 発明の効果
以上説明した如く、本発明は磁気デイスク媒体
を製造する際に磁性塗料の塗膜厚を薄く且つ均一
に磁気デイスク基盤上に形成する為に必要な磁気
デイスク基盤に垂直で半径方向に均一に分布し、
漏洩磁束の無い磁界を形成することが可能となる
ため、其の効果は大なるものがある。(f) Effects of the Invention As explained above, the present invention provides a magnetic coating perpendicular to the magnetic disk substrate, which is necessary for forming a thin and uniform coating film of magnetic paint on the magnetic disk substrate when manufacturing magnetic disk media. evenly distributed in the radial direction,
Since it becomes possible to form a magnetic field without leakage magnetic flux, the effect is great.
第１図は電磁石を用いた場合の磁気デイスク媒
体製造装置の磁極配置方法の一例を示す図、第２
図は永久磁石を用いた場合の磁気デイスク媒体製
造装置の磁極配置方法の一例を示す図である。
１，４，５は他極、２は磁気デイスク基盤、３
は電磁石、３′は永久磁石、６，７，９は磁路、
８は回転軸である。
Fig. 1 is a diagram showing an example of a method of arranging magnetic poles in a magnetic disk medium manufacturing apparatus using electromagnets;
The figure shows an example of a method for arranging magnetic poles in a magnetic disk medium manufacturing apparatus using permanent magnets. 1, 4, 5 are other poles, 2 is a magnetic disk base, 3
is an electromagnet, 3' is a permanent magnet, 6, 7, 9 are magnetic paths,
8 is a rotation axis.
Claims (1)
ンコート法により塗布し、高速回転して均一な厚
みを持つ塗膜を形成する磁気デイスク媒体製造装
置に於いて、磁気デイスク基盤の塗膜形成時に磁
気デイスク基盤に接近して該磁気デイスク基盤の
半径方向に該磁気デイスク基盤の塗膜幅を覆う範
囲以上の幅を持つ長方形の磁極を設け、磁気デイ
スク基盤を挟んで前記磁極に対向する位置及び／
又は前記磁極と磁気デイスク基盤の同一面上に於
いて前記磁極に近接した位置の片方及び／又は前
記近接した位置の両方に、漏洩磁束を吸収するた
めの他極を配置し、磁気デイスク基盤の半径方向
に平行で間隔の等しい空〓を構成することを特徴
とする磁気デイスク媒体製造装置の磁極配置方
法。 ２ 上記長方形の磁極に永久磁石を用いる場合は
該永久磁石の磁気デイスク基盤面に対向する面に
高導磁率材による磁路を設け、該磁路を介して上
記他極と上記空〓を構成することを特徴とする磁
気デイスク媒体製造装置の磁極配置方法。[Scope of Claims] 1. In a magnetic disk media manufacturing apparatus that applies a paint containing magnetic powder to a magnetic disk substrate by spin coating and rotates at high speed to form a coating film with a uniform thickness, When forming a coating film, a rectangular magnetic pole is provided in the radial direction of the magnetic disk substrate in the radial direction of the magnetic disk substrate, and the magnetic pole is placed on both sides of the magnetic disk substrate. position facing and/
Alternatively, on the same surface of the magnetic pole and the magnetic disk base, another pole for absorbing leakage magnetic flux is arranged at one of the positions close to the magnetic pole and/or at both positions close to the magnetic pole, and the magnetic disk base A method for arranging magnetic poles in a magnetic disk medium manufacturing apparatus, characterized in that spaces are formed parallel to each other in the radial direction and equally spaced. 2. When a permanent magnet is used as the rectangular magnetic pole, a magnetic path made of a high magnetic conductivity material is provided on the surface of the permanent magnet facing the magnetic disk base surface, and the other pole and the air are connected via the magnetic path. A method for arranging magnetic poles in a magnetic disk medium manufacturing apparatus, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16859083A JPS6059533A (en) | 1983-09-13 | 1983-09-13 | Method for arranging magnetic pole in magnetic disc medium manufacturing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16859083A JPS6059533A (en) | 1983-09-13 | 1983-09-13 | Method for arranging magnetic pole in magnetic disc medium manufacturing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6059533A JPS6059533A (en) | 1985-04-05 |
| JPH0370855B2 true JPH0370855B2 (en) | 1991-11-11 |
Family
ID=15870871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16859083A Granted JPS6059533A (en) | 1983-09-13 | 1983-09-13 | Method for arranging magnetic pole in magnetic disc medium manufacturing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6059533A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5182693A (en) * | 1989-12-29 | 1993-01-26 | Tdk Corporation | Magnetic disk |
| US5160761A (en) * | 1989-12-29 | 1992-11-03 | Tdk Corporation | Method for making a magnetic disk |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5584026A (en) * | 1978-12-20 | 1980-06-24 | Fujitsu Ltd | Orientation device for magnetic disk |
| JPS58130444A (en) * | 1982-01-29 | 1983-08-03 | Hitachi Ltd | Orienting method of magnetic field of magnetic disc |
-
1983
- 1983-09-13 JP JP16859083A patent/JPS6059533A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5584026A (en) * | 1978-12-20 | 1980-06-24 | Fujitsu Ltd | Orientation device for magnetic disk |
| JPS58130444A (en) * | 1982-01-29 | 1983-08-03 | Hitachi Ltd | Orienting method of magnetic field of magnetic disc |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6059533A (en) | 1985-04-05 |
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