JPS6212567B2 - - Google Patents
Info
- Publication number
- JPS6212567B2 JPS6212567B2 JP53158903A JP15890378A JPS6212567B2 JP S6212567 B2 JPS6212567 B2 JP S6212567B2 JP 53158903 A JP53158903 A JP 53158903A JP 15890378 A JP15890378 A JP 15890378A JP S6212567 B2 JPS6212567 B2 JP S6212567B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- disk
- magnetic field
- orientation
- magnetic disk
- 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
- 239000006247 magnetic powder Substances 0.000 description 10
- 238000010586 diagram Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000004907 flux Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000000758 substrate Substances 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
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Landscapes
- Recording Or Reproducing By Magnetic Means (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Description
【発明の詳細な説明】
本発明は、異極関係にある一対の磁極により、
磁気デイスク上で均一かつ高い配向度の媒体を得
る磁気デイスク配向装置の改良に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized by a pair of magnetic poles having different polarity.
The present invention relates to an improvement in a magnetic disk alignment apparatus that obtains a medium with a uniform and high degree of orientation on a magnetic disk.
従来、磁気デイスク媒体は、出力、分解能、前
歴および雑音等に対する電磁変換特性を向上させ
るため、塗膜中の磁性粉の長軸方向をデイスク円
周方向に向けるように配向を行なつている。 Conventionally, magnetic disk media have been oriented so that the long axis direction of the magnetic powder in the coating film is oriented in the circumferential direction of the disk in order to improve the output, resolution, antecedent history, and electromagnetic conversion characteristics against noise.
磁気デイスク媒体の配向は、磁気テープの場合
と異なり、樹脂が熱硬化性であること、基板の形
状が円形であること等のために、困難な点が多
い。磁気デイスク媒体中の磁性粉を配向する装置
として、第１図ａに示すように、複数個の同極を
デイスク２を挾んで互に対向させ、特に異極間磁
極の先端を細くして、互に接近させることによ
り、有効磁束を形成させる方法および装置が従来
より提案されている。第１図ｂは、第１図ａの装
置の上面断面図である。第１図ａ，ｂにおいて、
１はコイル、２はデイスク（アルミ基板）、３は
漏洩磁場、４はコア、５は配向磁場である。 Unlike magnetic tape, the orientation of magnetic disk media is difficult because the resin is thermosetting, the substrate is circular, and so on. As a device for orienting magnetic powder in a magnetic disk medium, as shown in FIG. Methods and devices have been proposed in the past for forming effective magnetic flux by bringing magnetic fluxes close to each other. FIG. 1b is a top sectional view of the device of FIG. 1a. In Figures 1a and b,
1 is a coil, 2 is a disk (aluminum substrate), 3 is a leakage magnetic field, 4 is a core, and 5 is an orientation magnetic field.
しかし、第１図による方法では、漏洩磁場３の
強さが大きく、配向度があまり高くとれない。ま
た、漏洩磁場３を皆無にするためには、きわめて
高度の技術が要求される。 However, in the method shown in FIG. 1, the strength of the leakage magnetic field 3 is large, and the degree of orientation cannot be obtained very high. Furthermore, extremely advanced technology is required to completely eliminate the leakage magnetic field 3.
一般に、第１図ａのような機構では、磁気デイ
スクがこの配向装置に入るときと出るときに互に
Ｎ，Ｓ極が反転する漏洩磁場（反転磁場）が発生
し、この漏洩磁場の強さが大の場合には、磁性粉
の向きを変える。 Generally, in the mechanism shown in Figure 1a, a leakage magnetic field (reversal magnetic field) is generated in which the N and S poles are reversed when the magnetic disk enters and exits the orientation device, and the strength of this leakage magnetic field If it is large, change the direction of the magnetic powder.
第２図は、配向磁場と漏洩磁場の強さが等しい
場合のデイスク一周におけるコーテイング膜厚分
布図である。 FIG. 2 is a distribution diagram of the coating film thickness around one circumference of the disk when the orientation magnetic field and the leakage magnetic field have the same strength.
配向磁場と漏洩磁場の強さが等しい場合には、
第２図に示すように、膜厚の厚い部分と薄い部分
が周期的に現われる。そして、配向時の回転数を
速くすると周期は短くなり、遅くすると周期は長
くなる。これを肉眼で観察すると、デイスク直径
方向に幅を持つ濃淡膜様が明確に見られる。これ
は、磁気デイスク特有のものであり、デイスクが
回転するので、漏洩磁場が磁性粉の向きを変える
際、磁性粉が円周方向に移動し、何度も同一磁性
中を通過するため、密度が異つてくる現象であ
る。一周で磁性粉の密度が異なり、膜厚が１μｍ
程度異つてくると、コンタクト・スタート・スト
ツプ式ヘツドは使用できず、デイスク媒体として
は使用できない。漏洩磁場の強さが配向磁場の強
さの1/2以下では問題は起きていない。したがつ
て、漏洩磁場の強さはできる限り弱くするのが好
ましい。 When the strength of the orientation magnetic field and the leakage magnetic field are equal,
As shown in FIG. 2, thicker and thinner parts appear periodically. When the rotation speed during orientation is increased, the period becomes shorter, and when the rotation speed is decreased, the period becomes longer. When this is observed with the naked eye, a dark and light film-like pattern with width in the disk diameter direction is clearly seen. This is unique to magnetic disks.As the disk rotates, when the leakage magnetic field changes the direction of the magnetic powder, the magnetic powder moves in the circumferential direction and passes through the same magnetic medium many times, resulting in This is a phenomenon that differs. The density of magnetic powder is different in one round, and the film thickness is 1 μm.
To a different extent, a contact start/stop type head cannot be used and cannot be used as a disk medium. No problem occurs when the strength of the leakage magnetic field is less than 1/2 of the strength of the orienting magnetic field. Therefore, it is preferable to make the strength of the leakage magnetic field as weak as possible.
この目的のため本発明者は特願昭52―158434号
において、第３図に示すような改良された磁気デ
イスク配向装置を提案した。 For this purpose, the present inventor proposed an improved magnetic disk orienting device as shown in FIG. 3 in Japanese Patent Application No. 52-158434.
第３図は先に提案した配向装置の上面断面図で
ある。この配向装置における正面の断面形状は、
第１図ａに示すように従来と同一であるが、配向
装置を構成する永久磁石（コア４）の平面形状は
第３図に示すような扇形磁石を用いる。すなわ
ち、デイスク２の回転方向に対して漏洩磁場が発
生する磁極の稜の方向７を、デイスク２の直径方
向と一致させる。 FIG. 3 is a top sectional view of the alignment device proposed earlier. The front cross-sectional shape of this orientation device is
As shown in FIG. 1a, the present invention is the same as the conventional one, but the planar shape of the permanent magnet (core 4) constituting the orientation device is a fan-shaped magnet as shown in FIG. 3. That is, the direction 7 of the edge of the magnetic pole in which a leakage magnetic field is generated with respect to the rotational direction of the disk 2 is made to coincide with the diametrical direction of the disk 2.
第１図ｂに示すような平面形状が矩形の永久磁
石の場合には、漏洩磁場が発生する磁極の稜の方
向とデイスクの直径方向とが約45゜の角度で交差
するので、配向磁場５で配向された磁性粉が漏洩
磁場により45゜の方向に曲げられることになる。
これに対して、第３図図に示すように、漏洩磁場
の発生方向７とデイスク２の直径方向とを一致さ
せた形状の永久磁石を用いると、配向磁場５で配
向された磁性粉は漏洩磁場により向きを変更され
るが、デイスク２の円周方向にNS極を反転され
るため、磁性粉が円周方向に移動しにくくなり、
デイスク円周上の密度は均一化される。 In the case of a permanent magnet with a rectangular planar shape as shown in FIG. The magnetic powder oriented in this direction will be bent in a 45° direction by the leakage magnetic field.
On the other hand, as shown in FIG. 3, if a permanent magnet with a shape in which the leakage magnetic field generation direction 7 matches the diameter direction of the disk 2 is used, the magnetic powder oriented by the orientation magnetic field 5 will leak. Although the direction is changed by the magnetic field, the NS pole is reversed in the circumferential direction of disk 2, making it difficult for the magnetic powder to move in the circumferential direction.
The density on the disk circumference is made uniform.
しかしながら、先の提案では漏洩磁場の方向に
よる影響を小さくすることはできても、殆んど無
視しえるまで皆無とすることは原理的に不可能で
あつた。特に、磁気デイスクの高密度記録が要求
されるに伴い更に配向度が高くなるよう要求され
ている。 However, in the previous proposal, although it was possible to reduce the influence of the direction of the leakage magnetic field, it was theoretically impossible to eliminate it to the point where it could be almost ignored. In particular, with the demand for high-density recording on magnetic disks, there is a demand for higher degrees of orientation.
本発明は、漏洩磁場の方向による影響を皆無と
することが可能な磁気デイスク配向装置を提供す
ることを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk orienting device that can completely eliminate the influence of the direction of leakage magnetic fields.
この目的の達成のため、本発明磁気デイスク配
向装置は、異極関係にある一対の磁極を具え、該
一対の磁極の一端による磁場方向が配向すべき磁
気デイスクの円周方向となるように該磁気デイス
クに対し設け、該磁気デイスクを回転させ該磁場
により磁気デイスクを配向せしめる磁気デイスク
配向装置において、該一対の磁極は夫々前記磁気
デイスクの円周方向に沿う半円形状を成し、且つ
該磁極の一端間の距離は他端間の距離よりも短か
く設定されて成ると共に、該一対の磁極の他端か
らの漏洩磁場が配向すべき磁気デイスクの円周方
向となるように構成されて成ることを特徴とす
る。 In order to achieve this object, the magnetic disk orienting apparatus of the present invention is provided with a pair of magnetic poles having different polarity, and is arranged so that the direction of the magnetic field from one end of the pair of magnetic poles is in the circumferential direction of the magnetic disk to be oriented. In a magnetic disk orientation device that is provided on a magnetic disk and rotates the magnetic disk to orient the magnetic disk using the magnetic field, each of the pair of magnetic poles has a semicircular shape along the circumferential direction of the magnetic disk; The distance between one end of the magnetic poles is set to be shorter than the distance between the other ends, and the leakage magnetic field from the other end of the pair of magnetic poles is configured to be oriented in the circumferential direction of the magnetic disk. It is characterized by becoming.
以下、本発明を実施例に基いて説明する。 The present invention will be explained below based on examples.
第４図は本発明の一実施例上面図であり、８は
一対の磁極、９は円板状の磁気デイスクを示す。 FIG. 4 is a top view of one embodiment of the present invention, in which numeral 8 indicates a pair of magnetic poles, and 9 indicates a disc-shaped magnetic disk.
第３図と相違する点は、各磁極の平面形状がほ
ぼ半円形に構成されている点にある。 The difference from FIG. 3 is that each magnetic pole has a substantially semicircular planar shape.
即ち、磁極の漏洩磁場１１の方向が円周方向に
なるよう磁極が半円形に構成されている。このた
め漏洩磁場１１の方向により影響を受けない。 That is, the magnetic pole is configured in a semicircular shape so that the direction of the leakage magnetic field 11 of the magnetic pole is in the circumferential direction. Therefore, it is not affected by the direction of the leakage magnetic field 11.
漏洩磁場１１は配向磁場１０とは、磁気デイス
ク回転方向に対し方向が逆のため、漏洩磁場の大
きさは配向磁場の大きさの1/3以下が好ましい。
このためには配向磁場を生ずる磁極間隔を漏洩磁
場を生ずる磁極間隔より小とすることが必要であ
る。 Since the direction of the leakage magnetic field 11 is opposite to the orientation magnetic field 10 with respect to the rotational direction of the magnetic disk, the magnitude of the leakage magnetic field is preferably 1/3 or less of the magnitude of the orientation magnetic field.
For this purpose, it is necessary to make the magnetic pole spacing that generates the orientation magnetic field smaller than the magnetic pole spacing that generates the leakage magnetic field.
例えば、第４図では配向磁場の強さ2000Oe，
漏洩磁場の強さ200Oeである。 For example, in Figure 4, the strength of the orientation magnetic field is 2000Oe,
The strength of the leakage magnetic field is 200 Oe.
このような本発明の構成によれば、配向度は下
記の如くなる。 According to such a structure of the present invention, the degree of orientation is as follows.
磁性粉としてγFe2O3の針状粒子を用い、アル
ミナを撹拌のためのボールとして使用した磁性塗
膜を形成した場合、本発明の第４図、第５図の構
成による配向度（角形比Br／Bs）は0.90とな
り、これは静置配向値（磁気デイスクを静置し、
磁石により１部のみを配向したこの一部の配向値
であり、漏洩磁場の影響を一切受けない）と同一
である。 When a magnetic coating film is formed using acicular particles of γFe 2 O 3 as magnetic powder and alumina as a stirring ball, the degree of orientation (square ratio Br/Bs) is 0.90, which is the static orientation value (when the magnetic disk is left still,
This is the orientation value of only a portion of the magnetic field that is oriented by a magnet, and is not affected by the leakage magnetic field at all.
尚、第３図の構成による配向度は0.75であつ
た。 The degree of orientation with the configuration shown in FIG. 3 was 0.75.
上述のように本発明によれば、一対の磁極の形
状を半円形状とし、他端による磁場方向をも磁気
デイスクの円周方向と平行となるように構成した
ので、漏洩磁場を皆無とすることができ、漏洩磁
場による磁気デイスクの配向への悪影響をなくす
ことが可能となるため、配向度が向上し、極めて
高性能の磁気デイスクを得ることができる。 As described above, according to the present invention, the shape of the pair of magnetic poles is semicircular, and the direction of the magnetic field from the other end is also parallel to the circumferential direction of the magnetic disk, so that there is no leakage magnetic field. This makes it possible to eliminate the negative influence of leakage magnetic fields on the orientation of the magnetic disk, thereby improving the degree of orientation and making it possible to obtain a magnetic disk with extremely high performance.
第１図は従来の磁気デイスク配向装置構成図、
第２図は従来の構成によるコーテイング膜厚分布
図、第３図は先の提案による磁気デイスク配向装
置構成図、第４図は本発明の実施例構成図を示し
図中、１はコイル、２，９はデイスク、３，１
１，１４，１５は漏洩磁場、４はコア、５，１
０，１３は配向磁場を示す。
Figure 1 is a configuration diagram of a conventional magnetic disk alignment device.
FIG. 2 is a coating film thickness distribution diagram with a conventional configuration, FIG. 3 is a configuration diagram of a magnetic disk alignment apparatus proposed earlier, and FIG. 4 is a configuration diagram of an embodiment of the present invention. In the figure, 1 is a coil, 2 , 9 is a disk, 3, 1
1, 14, 15 are leakage magnetic fields, 4 is the core, 5, 1
0,13 indicates the orientation magnetic field.
Claims (1)
磁極の一端による磁場方向が配向すべき磁気デイ
スクの円周方向となるように該磁気デイスクに対
し設け、該磁気デイスクを回転させ該磁場により
磁気デイスクを配向せしめる磁気デイスク配向装
置において、 該一対の磁極は夫々前記磁気デイスクの円周方
向に沿う半円形状を成し、且つ該磁極の一端間の
距離は他端間の距離よりも短かく設定されて成る
と共に、該一対の磁極の他端からの漏洩磁場が配
向すべき磁気デイスクの円周方向となるように構
成されて成ることを特徴とする磁気デイスク配向
装置。[Scope of Claims] 1. A device comprising a pair of magnetic poles having a different polarity relationship, provided to the magnetic disk so that the direction of the magnetic field from one end of the pair of magnetic poles is in the circumferential direction of the magnetic disk to be oriented; In a magnetic disk orientation device that rotates a disk and orients the magnetic disk using the magnetic field, each of the pair of magnetic poles has a semicircular shape along the circumferential direction of the magnetic disk, and the distance between one end of the magnetic pole is equal to the other. A magnetic disk characterized in that the distance is set shorter than the distance between the two ends, and the leakage magnetic field from the other end of the pair of magnetic poles is oriented in the circumferential direction of the magnetic disk. Orientation device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15890378A JPS5584026A (en) | 1978-12-20 | 1978-12-20 | Orientation device for magnetic disk |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15890378A JPS5584026A (en) | 1978-12-20 | 1978-12-20 | Orientation device for magnetic disk |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21616686A Division JPS6265239A (en) | 1986-09-12 | 1986-09-12 | Magnetic disk orienting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5584026A JPS5584026A (en) | 1980-06-24 |
| JPS6212567B2 true JPS6212567B2 (en) | 1987-03-19 |
Family
ID=15681874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15890378A Granted JPS5584026A (en) | 1978-12-20 | 1978-12-20 | Orientation device for magnetic disk |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5584026A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6059533A (en) * | 1983-09-13 | 1985-04-05 | Fujitsu Ltd | Method for arranging magnetic pole in magnetic disc medium manufacturing device |
| JPS6063726A (en) * | 1983-09-19 | 1985-04-12 | Fujitsu Ltd | Method and device for manufacturing magnetic disk medium |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5194805A (en) * | 1975-02-19 | 1976-08-19 | Jikikirokubaitaino seizohoho |
-
1978
- 1978-12-20 JP JP15890378A patent/JPS5584026A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5194805A (en) * | 1975-02-19 | 1976-08-19 | Jikikirokubaitaino seizohoho |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5584026A (en) | 1980-06-24 |
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