JPS6329335B2 - - Google Patents
Info
- Publication number
- JPS6329335B2 JPS6329335B2 JP52074478A JP7447877A JPS6329335B2 JP S6329335 B2 JPS6329335 B2 JP S6329335B2 JP 52074478 A JP52074478 A JP 52074478A JP 7447877 A JP7447877 A JP 7447877A JP S6329335 B2 JPS6329335 B2 JP S6329335B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- disk substrate
- disk
- magnetic field
- particles
- 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
Links
- 230000005291 magnetic effect Effects 0.000 claims description 80
- 239000000758 substrate Substances 0.000 claims description 33
- 239000006249 magnetic particle Substances 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 description 11
- 238000000576 coating method Methods 0.000 description 11
- 230000005415 magnetization Effects 0.000 description 8
- 239000000696 magnetic material Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000004528 spin coating Methods 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】
本発明は磁気デイスクの製造方法に係り、特に
デイスク基板上に形成した磁性塗膜の配向方法に
特徴を有する磁気デイスクの製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a magnetic disk, and more particularly to a method for manufacturing a magnetic disk characterized by an orientation method of a magnetic coating film formed on a disk substrate.
磁気デイスクを製造する場合、デイスク基板上
に例えばスピンコート法等によつて磁性塗膜を形
成し、次いでこのデイスク基板に磁場を印加して
磁性塗膜中の磁性粒子、即ち強磁性体の長軸をデ
イスク基板の円周方向に配向させることが行われ
る。即ち、デイスク基板上に塗布した磁性材料が
適当な粘度を有している間にデイスク基板面従つ
て塗布した磁性層面に平行でかつ該デイスクの接
線方向の磁場を印加することにより磁性層内の磁
性粒子を円周方向に配向させて該磁性層の磁気特
性の改善を計つている。 When manufacturing a magnetic disk, a magnetic coating film is formed on a disk substrate by, for example, a spin coating method, and then a magnetic field is applied to the disk substrate to separate the magnetic particles in the magnetic coating film, that is, the length of the ferromagnetic material. The axis is oriented in the circumferential direction of the disk substrate. That is, while the magnetic material coated on the disk substrate has an appropriate viscosity, the magnetic field within the magnetic layer is applied parallel to the disk substrate surface, that is, the coated magnetic layer surface, and in the tangential direction of the disk. The magnetic particles are oriented in the circumferential direction to improve the magnetic properties of the magnetic layer.
しかしながら、単に上述の如く磁場を印加した
のみでは充分な配向度即ち角形比（Br／Bs）を
得ることができない。 However, by simply applying a magnetic field as described above, it is not possible to obtain a sufficient degree of orientation, that is, a squareness ratio (Br/Bs).
従つて本発明の目的は従来技術では達成し得な
かつた高い角形比の磁性層を有する磁気デイスク
を製造する方法を提供することにある。 SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for manufacturing a magnetic disk having a magnetic layer with a high squareness ratio that could not be achieved using the prior art.
上述の目的を達成する本発明の特徴は、磁気異
方性を有する磁性粒子を含む磁性層をデイスク基
板上に形成し、次いで、形成した磁性層中の磁性
粒子をデイスク基板面に平行でかつ該デイスクの
接線方向に平行に配向させる磁気デイスクの製造
方法において、前記面内配向磁場の影響を受けな
い場所で、前記デイスク基板の両面に近接し前記
デイスク基板を挟んで配置された少なくとも１対
の異極間磁石からなる垂直磁場発生手段により前
記磁性層に垂直磁場を印加し、前記磁性層中の前
記磁性粒子を一旦垂直方向に配向する第１の工
程、前記垂直方向に配向された磁性粒子を前記垂
直磁場から遠ざけて該磁性粒子を水平方向に整位
せしめる第２の工程、前記デイスク基板の上下面
に対向して配置された少なくとも２対の磁石によ
つて発生された面内配向磁場を印加して前記水平
方向に整位された磁性粒子をさらに印加磁束方向
に配向させる第３の工程を具備し、前記第１から
第３の工程のうちの任意の工程から開始し、前記
順序で複数回繰り返すことにある。 The present invention is characterized in that a magnetic layer containing magnetic particles having magnetic anisotropy is formed on a disk substrate, and then the magnetic particles in the formed magnetic layer are aligned parallel to the disk substrate surface and In the method for manufacturing a magnetic disk that is oriented parallel to the tangential direction of the disk, at least one pair of magnetic disks are arranged adjacent to both surfaces of the disk substrate and sandwiching the disk substrate in a location not affected by the in-plane alignment magnetic field. a first step of applying a perpendicular magnetic field to the magnetic layer by a perpendicular magnetic field generating means consisting of a magnet with different polarities to once orient the magnetic particles in the magnetic layer in the perpendicular direction; a second step of horizontally aligning the magnetic particles by moving the particles away from the vertical magnetic field; an in-plane orientation generated by at least two pairs of magnets disposed opposite to each other on the upper and lower surfaces of the disk substrate; a third step of applying a magnetic field to further orient the horizontally aligned magnetic particles in the direction of the applied magnetic flux, starting from any one of the first to third steps; It consists in repeating the sequence multiple times.
以下図面を用いて本発明を説明する。 The present invention will be explained below using the drawings.
第１図Ａ，Ｂは本発明の一実施例における製造
装置の概略を表わす立面図、平面図である。この
図において、１は磁性層を形成すべきデイスク基
板、２は該デイスク基板１を回転させる回転装置
に連結される回転軸、３は該デイスク基板１の上
面及び下面にそれぞれ近接し該デイスク基板を挟
むように設けられた１対の磁極から成る第１の直
流磁化装置である。この第１の直流磁化装置３は
デイスク基板１の一つの半径方向に設けられてお
り、本実施例においてはデイスク基板１の上側が
Ｓ極、下側がＮ極の磁極となるように構成されて
いる。従つて磁束はデイスク基板面と垂直に下側
から上側に向つて形成される。この第１の直流磁
化装置３は、上述のように１対の異極間磁石から
なり、垂直方向成分のみのかつ磁場勾配のない垂
直磁場を発生する。デイスク基板１の軸に関して
第１の直流磁化装置３の反対側には２対の第２の
直流磁化装置４が半径方向に設けられている。第
１の直流磁化装置３と第２の直流磁化装置４は互
いに影響を与えないように離間して配置される。
この直流磁化装置４のうちの１対はデイスク基板
１の上面に近接して平行に設けられており、その
磁極はデイスク基板１の回転方向に順次Ｎ極、Ｓ
極となるように配置されている。また他の１対は
デイスク基板１の下面に同様に設けられている。
従つてこれらの第２の直流磁化装置４による磁束
はデイスク基板面と平行にかつデイスクの回転接
線方向に向つたものとなる。 FIGS. 1A and 1B are an elevation view and a plan view schematically showing a manufacturing apparatus in an embodiment of the present invention. In this figure, 1 is a disk substrate on which a magnetic layer is to be formed, 2 is a rotating shaft connected to a rotating device that rotates the disk substrate 1, and 3 is a rotating shaft that is close to the upper and lower surfaces of the disk substrate 1, respectively. This is a first direct current magnetization device consisting of a pair of magnetic poles placed on both sides of the magnetic pole. This first DC magnetization device 3 is provided in the radial direction of one of the disk substrates 1, and in this embodiment, it is configured so that the upper side of the disk substrate 1 is the S pole and the lower side is the N pole. There is. Therefore, magnetic flux is formed perpendicularly to the disk substrate surface from the bottom to the top. As described above, the first DC magnetization device 3 is composed of a pair of magnets with different polarities, and generates a vertical magnetic field having only a vertical component and no magnetic field gradient. On the opposite side of the first DC magnetizer 3 with respect to the axis of the disk substrate 1, two pairs of second DC magnetizers 4 are provided in the radial direction. The first DC magnetization device 3 and the second DC magnetization device 4 are arranged apart from each other so as not to affect each other.
One pair of the DC magnetizers 4 is provided close to and parallel to the upper surface of the disk substrate 1, and its magnetic poles are successively N and S in the rotational direction of the disk substrate 1.
It is arranged as a pole. The other pair is similarly provided on the lower surface of the disk substrate 1.
Therefore, the magnetic flux produced by these second DC magnetizers 4 is directed parallel to the disk substrate surface and in the tangential direction of rotation of the disk.
第２図Ａ，Ｂ，Ｃは本実施例における磁性層の
配向の模様を説明する図であり、以下これらの図
を参照して本実施例の工程を説明する。まず、デ
イスク基板１を回転軸２に同軸に固定し、これを
矢印方向に回転させる。次いで磁性材料５を該デ
イスク基板１の内周部上に滴下する。磁性材料５
は磁性酸化鉄等の磁気異方性を有する針状粒子を
熱硬化性樹脂等のバインダーが溶解した有機溶媒
液に分散させたものである。滴下された磁性材料
５はデイスク基板１の遠心力により離心方向に拡
がり、斯くして磁性塗膜６が形成される。この形
成されたばかりの磁性塗膜６内の磁性粒子７は第
２図Ａに示す如くランダムに配向している。さ
て、デイスク基板１の回転によりこの塗膜６の部
分が適度の粘度のまま第１の直流磁化装置３に達
すると、塗膜面に対して垂直の磁場が印加される
ことから第２図Ｂの如く磁性粒子７が垂直方向に
配向する。次いで第１の直流磁化装置３を通り過
ぎ垂直方向の磁場がとり去られると塗膜の厚さが
数μmと極めて薄いため磁性粒子７は自らの反磁
場により水平方向に倒れる。この状態の塗膜が第
２の直流磁化装置４によりデイスク基板面従つて
塗膜面に平行でかつデイスク回転接線方向の磁場
を受け磁性粒子はこの磁場方向に配向される（第
２図Ｃ）。 FIGS. 2A, B, and C are diagrams for explaining the orientation pattern of the magnetic layer in this embodiment, and the steps of this embodiment will be explained below with reference to these diagrams. First, the disk substrate 1 is coaxially fixed to the rotating shaft 2 and rotated in the direction of the arrow. Next, the magnetic material 5 is dropped onto the inner peripheral portion of the disk substrate 1. Magnetic material 5
is a material in which acicular particles having magnetic anisotropy such as magnetic iron oxide are dispersed in an organic solvent solution in which a binder such as a thermosetting resin is dissolved. The dropped magnetic material 5 spreads in an eccentric direction due to the centrifugal force of the disk substrate 1, thus forming a magnetic coating film 6. The magnetic particles 7 in the newly formed magnetic coating 6 are randomly oriented as shown in FIG. 2A. Now, when the coating film 6 reaches the first DC magnetizer 3 with an appropriate viscosity due to the rotation of the disk substrate 1, a magnetic field perpendicular to the coating film surface is applied. The magnetic particles 7 are oriented in the vertical direction as shown in FIG. Next, when the magnetic particles 7 pass through the first DC magnetizer 3 and the vertical magnetic field is removed, the magnetic particles 7 fall horizontally due to their own demagnetizing field because the coating film is extremely thin, a few μm thick. The coating film in this state is subjected to a magnetic field parallel to the disk substrate surface or coating surface and tangential to the disk rotation by the second DC magnetization device 4, and the magnetic particles are oriented in the direction of this magnetic field (Fig. 2C). .
第３図は本実施例装置により製造した磁性層と
従来装置により製造した磁性層の磁気特性を表わ
す図である。この図において横軸はデイスク基板
面に平行でかつデイスクの接線方向に平行な磁場
即ち面内配向磁場（Oe）、縦軸は角形比（Br／
Bs）を表わしており、７は従来装置即ち面内配
向操作のみを行う装置による場合、８は本実施例
装置により800Oeの垂直磁場を印加した後、面内
配向操作を行つた場合、９は本実施例装置により
1600Oeの垂直磁場を印加した後、面内配向操作
を行つた場合である。なお、これらの場合に用い
た磁性粒子はγ―Fe2O3であり、この保磁力は
350Oeである。 FIG. 3 is a diagram showing the magnetic properties of the magnetic layer manufactured by the apparatus of this embodiment and the magnetic layer manufactured by the conventional apparatus. In this figure, the horizontal axis is the magnetic field parallel to the disk substrate surface and the tangential direction of the disk, that is, the in-plane orientation magnetic field (Oe), and the vertical axis is the squareness ratio (Br/
Bs), where 7 is a conventional device, that is, a device that performs only an in-plane alignment operation, 8 is a device of this embodiment, where an in-plane alignment operation is performed after applying a vertical magnetic field of 800 Oe, and 9 is a device that performs an in-plane alignment operation. With this example device
This is the case where an in-plane orientation operation was performed after applying a perpendicular magnetic field of 1600 Oe. The magnetic particles used in these cases were γ-Fe 2 O 3 , and the coercive force was
It is 350Oe.
第３図からも明らかのように、一度垂直方向に
配向させた磁性粒子は、垂直磁場を取り去ると反
磁場によつて水平方向に倒れ、この倒れた状態の
磁性粒子に面内配向磁場を印加すると、無配向状
態の磁性粒子にいきなり面内配向磁場を印加した
場合よりもはるかに配向度が良くなり、従つて角
形比が向上する。 As is clear from Figure 3, once the vertical magnetic field is removed, the magnetic particles fall horizontally due to the demagnetizing field, and an in-plane alignment magnetic field is applied to the fallen magnetic particles. As a result, the degree of orientation becomes much better than when an in-plane orientation magnetic field is suddenly applied to magnetic particles in a non-oriented state, and the squareness ratio improves.
なお、前述の実施例ではスピンコート法により
磁性層を形成しているが、本発明はその他の磁性
層形成方法例えばスプレーコート法にも適用でき
る。さらに、垂直配向磁場及び面内配向磁場の印
加方法については、面内配向磁場を印加する前に
垂直配向磁場を印加してこれを取り去るようにす
れば良く、上述の実施例の印加方法に限定される
ものではない。実際の製造工程においては、前述
の工程は複数回の繰り返しの後、磁性塗料の乾燥
により終了する。 Although the magnetic layer is formed by spin coating in the above embodiment, the present invention can also be applied to other methods of forming the magnetic layer, such as spray coating. Furthermore, regarding the method of applying the vertical alignment magnetic field and the in-plane alignment magnetic field, it is sufficient to apply the vertical alignment magnetic field and remove it before applying the in-plane alignment magnetic field, and is limited to the application method of the above-mentioned embodiment. It is not something that will be done. In the actual manufacturing process, the above-mentioned process is completed by drying the magnetic paint after repeating a plurality of times.
以上詳細に説明したように、本発明の製造方法
は、磁性層に垂直配向磁場を印加してこれを取り
去つた後、面内配向磁場を印加しているため、配
向度が非常に良くなり、従つて磁気特性が大幅に
向上される利点を有している。 As explained in detail above, in the manufacturing method of the present invention, a vertical alignment magnetic field is applied to the magnetic layer and then removed, and then an in-plane alignment magnetic field is applied, so that the degree of alignment is very good. Therefore, it has the advantage that the magnetic properties are greatly improved.
第１図Ａ，Ｂは本発明の一実施例装置の立面
図、平面図、第２図Ａ，Ｂ，Ｃは上記実施例の作
用を説明する図、第３図は製造された磁性層の磁
気特性図である。
１…デイスク基板、２…回転軸、３…第１の磁
化装置、４…第２の磁化装置、５…磁性材料、６
…磁性塗膜。
Figures 1A and B are an elevation view and a plan view of an apparatus according to an embodiment of the present invention, Figures 2A, B and C are diagrams explaining the operation of the above embodiment, and Figure 3 is a manufactured magnetic layer. FIG. DESCRIPTION OF SYMBOLS 1... Disk substrate, 2... Rotating shaft, 3... First magnetization device, 4... Second magnetization device, 5... Magnetic material, 6
...Magnetic coating.
Claims (1)
デイスク基板上に形成し、次いで、形成した磁性
層中の磁性粒子をデイスク基板面に平行でかつ該
デイスクの接線方向に平行に配向させる磁気デイ
スクの製造方法において、 面内配向磁場の影響を受けない場所で、前記デ
イスク基板の両面に近接し前記デイスク基板を挟
んで配置された少なくとも１対の異極間磁石から
なる垂直磁場発生手段により前記磁性層に垂直磁
場を印加し、前記磁性層中の前記磁性粒子を一旦
垂直方向に配向する第１の工程、 前記垂直方向に配向された磁性粒子を前記垂直
磁場から遠ざけて該磁性粒子を水平方向に整位せ
しめる第２の工程、 前記デイスク基板の上下面に対向して配置され
た少なくとも２対の磁石によつて発生された面内
配向磁場を印加して前記水平方向に整位された磁
性粒子をさらに印加磁束方向に配向させる第３の
工程を具備し、前記第１から第３の工程のうちの
任意の工程から開始し、前記順序で複数回繰り返
すことを特徴とする磁気デイスクの製造方法。[Claims] 1. A magnetic layer containing magnetic particles having magnetic anisotropy is formed on a disk substrate, and then the magnetic particles in the formed magnetic layer are aligned parallel to the surface of the disk substrate and in a tangential direction of the disk. In a method for manufacturing a magnetic disk that is oriented parallel to the magnetic field, at least one pair of interpolar magnets that are disposed close to both sides of the disk substrate and sandwiching the disk substrate in a place that is not affected by an in-plane alignment magnetic field. A first step of applying a perpendicular magnetic field to the magnetic layer using a perpendicular magnetic field generating means to once orient the magnetic particles in the magnetic layer in the vertical direction; a second step of horizontally aligning the magnetic particles by moving them away; comprising a third step of further orienting the horizontally aligned magnetic particles in the direction of the applied magnetic flux, starting from any step among the first to third steps and repeating the above order multiple times; A method for manufacturing a magnetic disk characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7447877A JPS549905A (en) | 1977-06-24 | 1977-06-24 | Production of magnetic discs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7447877A JPS549905A (en) | 1977-06-24 | 1977-06-24 | Production of magnetic discs |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS549905A JPS549905A (en) | 1979-01-25 |
| JPS6329335B2 true JPS6329335B2 (en) | 1988-06-13 |
Family
ID=13548410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7447877A Granted JPS549905A (en) | 1977-06-24 | 1977-06-24 | Production of magnetic discs |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS549905A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5812138A (en) * | 1981-07-13 | 1983-01-24 | Toshiba Corp | Production of magnetic recording medium |
| DE3308052A1 (en) * | 1983-03-08 | 1984-09-13 | Agfa-Gevaert Ag, 5090 Leverkusen | METHOD FOR PRODUCING A MAGNETIC RECORDING MATERIAL WITH VERTICAL ALIGNMENT |
| JPS61187125A (en) * | 1985-02-14 | 1986-08-20 | Hitachi Ltd | Method for orientating magnetic field of magnetic disk |
| EP0203002B1 (en) * | 1985-05-20 | 1992-01-15 | Fujitsu Limited | Longitudinal magnetic coated recording medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5045603A (en) * | 1973-08-25 | 1975-04-23 | ||
| JPS531508A (en) * | 1976-06-28 | 1978-01-09 | Nec Corp | Preparation of magnetic recording medium and device therefor |
-
1977
- 1977-06-24 JP JP7447877A patent/JPS549905A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5045603A (en) * | 1973-08-25 | 1975-04-23 | ||
| JPS531508A (en) * | 1976-06-28 | 1978-01-09 | Nec Corp | Preparation of magnetic recording medium and device therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS549905A (en) | 1979-01-25 |
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