JPS631648B2 - - Google Patents
Info
- Publication number
- JPS631648B2 JPS631648B2 JP21616686A JP21616686A JPS631648B2 JP S631648 B2 JPS631648 B2 JP S631648B2 JP 21616686 A JP21616686 A JP 21616686A JP 21616686 A JP21616686 A JP 21616686A JP S631648 B2 JPS631648 B2 JP S631648B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- disk
- magnetic field
- orientation
- leakage
- 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 105
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 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
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001105 regulatory effect Effects 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
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磁気デイ
スク媒体を得ることが可能な磁気デイスク配向装
置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 a magnetic disk alignment apparatus that can obtain a magnetic disk 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から困難な点が多い。 Unlike the case of magnetic tape, the orientation of magnetic disk media is difficult because the resin is thermosetting and the shape of the substrate is circular.
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を挟んで互いに対向させ、特に異極間磁
極の先端を細くして、互い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
置の上部断面図である。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。 As shown in Fig. 1a, a device for orienting magnetic powder in a magnetic disk medium is constructed by arranging a plurality of like poles facing each other with a disk 2 in between, and making the tips of the magnetic poles between different poles particularly thin so that they can be aligned with each other. Methods and devices have been proposed in the past for forming an effective magnetic flux by bringing them close together. FIG. 1b is a top sectional view of the device of FIG. 1a. In Figure 1 a 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
高度な技術が要求される。 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. Further, 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い
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) in which the N and S poles are reversed is generated when the magnetic disk enters and exits the orientation device, and the strength of this leakage magnetic field increases. If the size is too 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
が周期的に現れる。そして、配向時の回転数を速
くすると周期は短かくなり、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模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、密度が異なつてくる現象であ
る。一周で磁性粉の密度が異なり、膜厚が1μｍ
程度異なつてくると、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。従つて、
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 portions 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 shading pattern with width in the disk diameter direction can be 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 occurs in different ways. The density of magnetic powder is different in one round, and the film thickness is 1 μm.
To a different extent, contact start/stop type heads cannot be used and cannot be used as disk media. 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 inventor has filed a patent application filed in
No. 158434, an improved magnetic disk orienting device as shown in FIG. 3 was proposed.
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。即ち、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度の角度で交差
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度の方向に曲げられることになる。
これに対して、第３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 degree direction by the leakage magnetic field.
On the other hand, as shown in FIG. 3, if a permanent magnet is used that has a shape in which the leakage magnetic field generation direction 7 matches the diameter direction of the disk 2, the magnetic powder oriented by the orientation magnetic field 5 will be exposed to the leakage magnetic field. However, since the NS pole is reversed in the circumferential direction of the disk 2, it becomes difficult for the magnetic powder to move in the circumferential direction, and 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 an even higher degree 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、発明の磁気デイスク配
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、該磁極の他端からの漏洩磁場
が該磁気デイスクの円周方向となるように該一対
の磁極に近接して磁路形成体を設けたことを特徴
とする。 To achieve this object, the magnetic disk orienting device of the invention includes a pair of magnetic poles having different polarity, and the magnetic disk is aligned 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 installed on a magnetic disk and rotates the magnetic disk to orient the magnetic disk using the magnetic field, the pair of magnetic disks are arranged so that the leakage magnetic field from the other end of the magnetic pole is in the circumferential direction of the magnetic disk. It is characterized in that a magnetic path forming body is provided close to the magnetic pole.
以下、本発明を実施例に基づいて説明する。 Hereinafter, the present invention will be explained based on examples.
第４図は本発明の実施例の上面図であり、８′
は一対の磁極、９は円板状の磁気デイスク、１２
は磁路形成体を示す。 FIG. 4 is a top view of an embodiment of the present invention;
are a pair of magnetic poles, 9 is a disc-shaped magnetic disk, 12
indicates a magnetic path forming body.
第３図との相違点は、磁極８，８′の形成され
ていない磁気デイスク９上に磁路形成体１２をそ
の円周方向に沿つて設けたことにある。この磁路
形成体１２は強磁性体であることが好ましく、例
えば鉄板で構成される。磁路形成体１２により漏
洩磁場１４，１５は磁気デイスク９の円周方向に
沿つた方向に規制され、漏洩磁場１４，１５の方
向により影響を受けない。 The difference from FIG. 3 is that a magnetic path forming body 12 is provided along the circumferential direction on a magnetic disk 9 on which magnetic poles 8, 8' are not formed. This magnetic path forming body 12 is preferably made of a ferromagnetic material, and is made of, for example, an iron plate. The leakage magnetic fields 14 and 15 are regulated by the magnetic path forming body 12 in a direction along the circumferential direction of the magnetic disk 9, and are not affected by the direction of the leakage magnetic fields 14 and 15.
但し、漏洩磁場１４，１５の方向と配向磁場１
３の方向とは磁気デイスク回転方向に対し、反転
しているため、漏洩磁場１４，１５の強さを配向
磁場１３の強さの1/3以下とすることが好ましい。 However, the directions of the leakage magnetic fields 14 and 15 and the orientation magnetic field 1
Since the direction No. 3 is reversed with respect to the direction of rotation of the magnetic disk, it is preferable that the strength of the leakage magnetic fields 14 and 15 be 1/3 or less of the strength of the alignment magnetic field 13.
本実施例では配向磁場の強さ2000Oe、漏洩磁
場の強さ700Oeである。 In this example, the strength of the orientation magnetic field is 2000 Oe, and the strength of the leakage magnetic field is 700 Oe.
このような本発明の構成によれば、配向度は下
記の如くとなる。 According to the configuration 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
向度（磁気デイスクを静置し、磁石により一部の
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 (squareness ratio Br/Bs) according to the configuration of the present invention is 0.90. , this is the same as the static orientation degree (this is the orientation value of a part of the magnetic disk when it is left still and only a part of it is oriented by a magnet, and is not affected by any leakage magnetic field).
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.
以上説明したように、本発明によれば、一対の
磁極の他に、この磁極の他端による漏洩磁場の方
向が磁気デイスクの円周方向となるように磁路形
成体を配置したので、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 explained above, according to the present invention, in addition to the pair of magnetic poles, the magnetic path forming body is arranged so that the direction of the leakage magnetic field due to the other end of the magnetic pole is in the circumferential direction of the magnetic disk. Since the magnetic field can be completely eliminated and the negative influence of the leakage magnetic field on the orientation of the magnetic disk can be eliminated, the degree of orientation can be improved and a magnetic disk with extremely high performance can be obtained.
第１図は従来の磁気デイスクの配向装置構成
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
夫々示す。
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、１２は磁路形成体を夫々示
す。
FIG. 1 is a diagram showing the configuration of a conventional magnetic disk orientation device, FIG. 2 is a coating film thickness distribution diagram with the conventional configuration, FIG. 3 is a configuration diagram of the magnetic disk orientation device proposed earlier, and FIG. The configuration diagrams of the embodiments are shown respectively. In the figure, 1 is a coil, 2, 9 are disks, 3, 1
1, 14, 15 are leakage magnetic fields, 4 is the core, 5, 1
0 and 13 are orientation magnetic fields, and 12 is a magnetic path forming body, respectively.
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、 該磁極の他端からの漏洩磁場が該磁気デイスク
の円周方向となるように該一対の磁極に近接して
磁路形成体を設けた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, a magnetic path is formed close to the pair of magnetic poles so that the leakage magnetic field from the other end of the magnetic poles is in the circumferential direction of the magnetic disk. A magnetic disk orienting device characterized by having a body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21616686A JPS6265239A (en) | 1986-09-12 | 1986-09-12 | Magnetic disk orienting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21616686A JPS6265239A (en) | 1986-09-12 | 1986-09-12 | Magnetic disk orienting device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15890378A Division JPS5584026A (en) | 1978-12-20 | 1978-12-20 | Orientation device for magnetic disk |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6265239A JPS6265239A (en) | 1987-03-24 |
| JPS631648B2 true JPS631648B2 (en) | 1988-01-13 |
Family
ID=16684320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21616686A Granted JPS6265239A (en) | 1986-09-12 | 1986-09-12 | Magnetic disk orienting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6265239A (en) |
-
1986
- 1986-09-12 JP JP21616686A patent/JPS6265239A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6265239A (en) | 1987-03-24 |
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