JPH0435888B2 - - Google Patents
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- Publication number
- JPH0435888B2 JPH0435888B2 JP1306386A JP1306386A JPH0435888B2 JP H0435888 B2 JPH0435888 B2 JP H0435888B2 JP 1306386 A JP1306386 A JP 1306386A JP 1306386 A JP1306386 A JP 1306386A JP H0435888 B2 JPH0435888 B2 JP H0435888B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic medium
- surface layer
- magnetic
- layer
- inner layer
- 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
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- Compounds Of Iron (AREA)
- Hard Magnetic Materials (AREA)
Description
産業上の利用分野
本発明は、一つの磁石媒体に多数の磁石を有す
る多極磁石に関する。
従来の技術
近年、製造の自動化、事務の機械化に伴い、自
動化機器の制御の精度に対する要求が厳しくなつ
てきている。すなわち、速度や位置の制御精度を
向上させ、また機器の小型化を図る上で、制御手
段として、小さな磁石媒体に多数の磁極を着磁し
た多極磁石が必要になつて来た。
従来は、MO・6Fe2O3（但し、ＭはBaまたは
Sr）をポリアミド等の合成樹脂に分散せしめた
磁石媒体が使用されている。この磁石媒体に多極
着磁を施こす場合、一極の極ピツチは、せいぜい
100μm程度であつた。これより磁極間距離を小さ
くすることは、MO・6Fe2O3の粒子径や着磁を施
こすに際して、小さなギヤツプの着磁ヘツドによ
り発生する磁場も限られることから難しく、高精
度で高再生出力の着磁は不可能であつた。
これらの問題点を解決するために、δFe2O3を
合成樹脂に分散せしめた磁石媒体が提供されてい
る。しかし、δFe2O3は粒子径が小さいため、見
掛密度が小さく高充填をしなければ、再生出力の
非常に小さい磁石しか得られない。そこで、磁粉
を高充填した場合は、機械強度の低いものしか出
来なかつた。
一方、磁気式エンコーダの場合、一般にアルミ
ニウム等の金属基体に磁性粉を塗布して着磁する
方式が採用されている。ただ、この場合、着磁膜
の膜厚が薄くなるに従つて、反磁場が生じやすく
なり、再生出力が低下してエンコーダの精度が悪
くなることがあり、また、着磁膜が脱落する等の
欠点があつた。
発明が解決しようとする問題点
上述のように、従来の技術では、高精度で高再
生出力を有し、機械強度の大きい多極磁石を提供
することは難しかつた。
本発明は、これらの欠点に鑑み、磁極間距離の
小さな多極磁石の構成に関して、高精度で高再生
出力を有し、機械的強度の大きいものを提供する
ものである。
問題点を解決するための手段
すなわち、本発明は、磁石媒体の表面層が
δFe2O3分散した樹脂で構成され、前記表面層と
一体の内層がMO・6Fe2O3（但し、ＭはBrまたは
Sr）を分散した樹脂で構成されたことを特徴と
し、このような二層構造の磁石媒体を用いた多極
磁石である。
作 用
本発明は、磁石媒体の表面層がδFe2O3を充填
したものであり、着磁が容易であることから、高
精度に充填することにより高精度で高再生出力の
多極着磁を施こすことが出来る。また、MO・
6Fe2O3を樹脂に分散せしめた、表面層と一体の
内層は機械的強度が大きく、この層でジツクアツ
プしているため機械的強度の高い磁石媒体とする
ことが出来る。
実施例
次に、本発明の実施例を説明する。
実施例 １
第１図において、表面層１は、δFe2O375wt％、
12ナイロン25wt％からなつており、表面層１と
一体の内層２は、BaO・Fe2O380wt％、12ナイロ
ン20wt％からなつている。上記配合で予め混練
したペレツトを用意し、皿状の金属製保持体３の
立上り部外周面に、内層２を1300μm厚、表面層
１を200〜250μm厚でダブルインジエクシヨンに
より一体成形した。これを機械加工し、表面層
１、内層２の二層構造を有する磁石媒体部分を外
径35mm、高さ3.5mmに仕上げた。
上記金属製保持体は磁石媒体にＮ極、Ｓ極合せ
て5000極の着磁を行なつた。使用した着磁機は、
磁気ヘツドを用いた回転着磁機である。
上記多極磁石を周波数発生器として使用し、磁
気抵抗素子を用いて該素子と磁石媒体の間隔を
20μmに設定して再生出力を測定した。また、
1000rpm時のFG信号のWOWを、目黒電波製MK
−616にて測定した。合せて、100℃−1Hr→−40
℃−1Hrを100サイクル繰り返えす熱サイクルテ
ストを行なつた。結果を第１表に示す。
また、アイゾツト衝撃試験に供するために、上
述と同じ組成、厚さ構成で、ダブルインジエクシ
ヨンにて、第２図に示すような表面層１′と内層
２′からなる1.5mm厚の被層板を成形した。アイゾ
ツト衝撃試験の結果を第１表に示す。
比較例 １
実施例１の表面層用材料のみで金属製保持体付
磁石媒体及びアイゾツト衝撃試験用単層板を製造
し、実施例１と同様に評価した。測定結果を第１
表に示した。
比較例 ２
実施例１の内層用材料のみで金属製保持体付磁
石媒体及びアイゾツト衝撃試験用単層板を製造
し、実施例１と同様に評価した。測定結果を第１
表に示した。
INDUSTRIAL APPLICATION FIELD The present invention relates to a multipolar magnet having a large number of magnets in one magnetic medium. BACKGROUND OF THE INVENTION In recent years, with the automation of manufacturing and mechanization of office work, demands on the accuracy of control of automated equipment have become stricter. That is, in order to improve speed and position control accuracy and to downsize devices, multipolar magnets, in which a small magnetic medium is magnetized with a large number of magnetic poles, have become necessary as control means. Conventionally, MO・6Fe 2 O 3 (where M is Ba or
A magnetic medium in which Sr) is dispersed in a synthetic resin such as polyamide is used. When applying multi-pole magnetization to this magnetic medium, the pole pitch of one pole is at most
It was about 100 μm. It is difficult to make the distance between the magnetic poles smaller than this due to the particle size of MO・6Fe 2 O 3 and the magnetic field generated by the small gap magnetizing head during magnetization. It was impossible to magnetize the output. In order to solve these problems, a magnetic medium in which δFe 2 O 3 is dispersed in a synthetic resin has been provided. However, since δFe 2 O 3 has a small particle size, it has a small apparent density and unless it is highly packed, only a magnet with a very small reproduction output can be obtained. Therefore, when highly charged with magnetic powder, only a product with low mechanical strength could be produced. On the other hand, in the case of a magnetic encoder, a method is generally adopted in which magnetic powder is applied to a metal base such as aluminum and magnetized. However, in this case, as the thickness of the magnetized film becomes thinner, a demagnetizing field is more likely to occur, which may reduce the reproduction output and deteriorate the accuracy of the encoder, and may cause the magnetized film to fall off. There were some shortcomings. Problems to be Solved by the Invention As described above, with the conventional techniques, it has been difficult to provide a multipolar magnet with high precision, high reproduction output, and high mechanical strength. In view of these drawbacks, the present invention provides a multipolar magnet with a small distance between magnetic poles, which has high precision, high reproduction output, and high mechanical strength. Means for Solving the Problems That is, in the present invention, the surface layer of the magnetic medium is composed of a resin in which δFe 2 O 3 is dispersed, and the inner layer integrated with the surface layer is composed of MO.6Fe 2 O 3 (However, M is Br or
It is a multipolar magnet that uses a magnetic medium with a two-layer structure, and is characterized by being composed of a resin in which Sr) is dispersed. Effects The present invention is characterized in that the surface layer of the magnetic medium is filled with δFe 2 O 3 and is easy to magnetize. Therefore, by filling with high precision, multi-polar magnetization with high precision and high reproduction output can be achieved. can be applied. Also, MO・
The inner layer, which is made by dispersing 6Fe 2 O 3 in a resin and is integral with the surface layer, has a high mechanical strength, and since this layer is jagged, it is possible to create a magnetic medium with high mechanical strength. Examples Next, examples of the present invention will be described. Example 1 In FIG. 1, the surface layer 1 contains δFe 2 O 3 75wt%,
The inner layer 2, which is integral with the surface layer 1, consists of 80 wt% BaO.Fe 2 O 3 and 20 wt% 12 nylon. Pellets pre-kneaded with the above-mentioned composition were prepared and integrally formed on the outer peripheral surface of the rising portion of the dish-shaped metal holder 3 by double injection molding to form the inner layer 2 with a thickness of 1300 μm and the surface layer 1 with a thickness of 200 to 250 μm. This was machined, and the magnetic medium portion having a two-layer structure of a surface layer 1 and an inner layer 2 was finished to have an outer diameter of 35 mm and a height of 3.5 mm. The metal holder was magnetized with 5,000 poles including N and S poles on the magnetic medium. The magnetizing machine used was
This is a rotary magnetizing machine that uses a magnetic head. The above multipolar magnet is used as a frequency generator, and the distance between the element and the magnetic medium is controlled using a magnetoresistive element.
The reproduction output was measured with the setting at 20 μm. Also,
WOW of FG signal at 1000rpm, Meguro Denpa MK
Measured at -616. In total, 100℃−1Hr→−40
A thermal cycle test was conducted in which 100 cycles of ℃-1 hour were repeated. The results are shown in Table 1. In addition, in order to perform the Izot impact test, a 1.5 mm thick coating consisting of a surface layer 1' and an inner layer 2' as shown in Fig. 2 was made by double injection with the same composition and thickness as described above. The board was formed. The results of the Izod impact test are shown in Table 1. Comparative Example 1 A magnetic medium with a metal holder and a single layer plate for Izod impact test were manufactured using only the surface layer material of Example 1, and evaluated in the same manner as in Example 1. Measurement results first
Shown in the table. Comparative Example 2 A magnetic medium with a metal holder and a single layer plate for Izod impact test were manufactured using only the inner layer material of Example 1, and evaluated in the same manner as in Example 1. Measurement results first
Shown in the table.
【表】
発明の効果
本発明の構成によれば、第１表に示した様に、
再生出力が大きく着磁精度が高い、かつ機械的強
度の高い多極磁石となり、その工業的価値は極め
て大なるものである。[Table] Effects of the Invention According to the configuration of the present invention, as shown in Table 1,
This results in a multipolar magnet with large reproduction output, high magnetization precision, and high mechanical strength, and its industrial value is extremely large.
第１図は本発明の一実施例を示す断面図、第２
図はアイゾツト衝撃試験用複層板の斜視図であ
る。
１は表面層、２は内層。
FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIG.
The figure is a perspective view of a multilayer plate for Izotz impact testing. 1 is the surface layer, 2 is the inner layer.
Claims (1)
表面層と一体の内層がMO・6Fe2O3（但し、Ｍ：
BaまたはSr）分散樹脂である二層構造を有する
多極磁石。1 The surface layer of the magnetic medium is δFe 2 O 3 dispersed resin, and the inner layer integrated with the surface layer is MO.6Fe 2 O 3 (However, M:
Multipolar magnet with double layer structure which is Ba or Sr) dispersed resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1306386A JPS62171103A (en) | 1986-01-24 | 1986-01-24 | Multipolar magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1306386A JPS62171103A (en) | 1986-01-24 | 1986-01-24 | Multipolar magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62171103A JPS62171103A (en) | 1987-07-28 |
| JPH0435888B2 true JPH0435888B2 (en) | 1992-06-12 |
Family
ID=11822679
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1306386A Granted JPS62171103A (en) | 1986-01-24 | 1986-01-24 | Multipolar magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62171103A (en) |
-
1986
- 1986-01-24 JP JP1306386A patent/JPS62171103A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62171103A (en) | 1987-07-28 |
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