JPH01182905A - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPH01182905A JPH01182905A JP594388A JP594388A JPH01182905A JP H01182905 A JPH01182905 A JP H01182905A JP 594388 A JP594388 A JP 594388A JP 594388 A JP594388 A JP 594388A JP H01182905 A JPH01182905 A JP H01182905A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- magnetic
- recording medium
- temperature
- medium
- 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.)
- Pending
Links
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 52
- 230000004907 flux Effects 0.000 abstract description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 229910052742 iron Inorganic materials 0.000 abstract description 3
- 230000005284 excitation Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract 4
- 230000003247 decreasing effect Effects 0.000 abstract 2
- 239000000696 magnetic material Substances 0.000 description 12
- 239000000956 alloy Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000003302 ferromagnetic material Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/245—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for controlling the reluctance of the magnetic circuit in a head with single gap, for co-operation with one track
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B2005/0002—Special dispositions or recording techniques
- G11B2005/0005—Arrangements, methods or circuits
- G11B2005/0021—Thermally assisted recording using an auxiliary energy source for heating the recording layer locally to assist the magnetization reversal
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、一方向に相対的に移動される記録媒体の表面
に接触して各種データの記録・再生を行う磁気ヘッドに
関するもである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head that records and reproduces various data by contacting the surface of a recording medium that is relatively moved in one direction.
［従来技術］
従来、第４図に示すように、フロッピーディスクドライ
ブ用磁気ヘッド２１は、Ｍｎ−Ｚｎフェライト等の強磁
性体より成るコア半休２２８．２２ｂから構成されてお
り、そのコア半体２２ａ。[Prior Art] Conventionally, as shown in FIG. 4, a magnetic head 21 for a floppy disk drive is composed of a core half 228, 22b made of a ferromagnetic material such as Mn-Zn ferrite; .
２２ｂにより形成された磁気ギャップ２３により記録媒
体への記録・再生を行なっている。The magnetic gap 23 formed by the magnet 22b performs recording and reproduction on the recording medium.
［発明が解決しようとする問題点］
しかしながら、最近高密度記録化が要求されるようにな
り、短波長記録が必要となってきた。磁気ヘッドのギャ
ップ長もそれに伴い小さくなってきたが、ギャップ長を
短くすると記録磁界が小ざくなり記録媒体奥深くまで磁
化することができない。そのため、重ね書き特性（以下
０／Ｗ特性と称する）等の記録磁界の強さに関する動特
性値に種々の問題を発生していた。[Problems to be Solved by the Invention] However, recently there has been a demand for higher density recording, and shorter wavelength recording has become necessary. The gap length of magnetic heads has also become smaller as a result, but when the gap length is shortened, the recording magnetic field becomes smaller, making it impossible to magnetize deep into the recording medium. Therefore, various problems have occurred in dynamic characteristic values related to the strength of the recording magnetic field, such as overwriting characteristics (hereinafter referred to as 0/W characteristics).
更に、記録媒体も高抗磁力化が進み、いわゆるデータが
消去しにくい媒体となっている。フロッピーディスクド
ライブの場合、互換性という課題があり、強い磁界で記
録された媒体を、弱い磁界しか出せない磁気ヘッドで記
録する必要があり、その点でもＯ／Ｗ特性が大きな問題
となっていた。Furthermore, recording media are becoming increasingly high in coercive force, making them so-called media from which data is difficult to erase. In the case of floppy disk drives, there was an issue of compatibility; media recorded with a strong magnetic field had to be recorded with a magnetic head that could only emit a weak magnetic field, and O/W characteristics were a major problem in that respect as well. .
［発明の目的］
本発明は、詳述した問題点を解決するためになされたも
のであり、記録特性を向上することができる磁気ヘッド
を提供することを目的とする。[Object of the Invention] The present invention has been made to solve the problems described in detail, and an object of the present invention is to provide a magnetic head that can improve recording characteristics.
［問題点を解決するための手段］
この目的を達成するために本発明の磁気ヘッドは、記録
媒体と（占接する面で磁気ギャップに対して記録媒体の
相対移動方向側に鉄損の大きい１温磁性体が配置されて
いる。[Means for Solving the Problems] In order to achieve this object, the magnetic head of the present invention has a magnetic head with a large iron loss on the side of the relative movement direction of the recording medium with respect to the magnetic gap on the surface that occupies the recording medium. A warm magnetic material is placed.
［作用］
上記の構成を有する発明により、記録媒体への記録時に
発生される記録磁束により感温磁性体の温度が上昇され
ると、その温度上昇にともなって記録媒体も同様に温度
が上昇されて抗磁力が低下され、Ｏ／Ｗ特性が向上され
る。[Function] According to the invention having the above configuration, when the temperature of the temperature-sensitive magnetic body is increased by the recording magnetic flux generated during recording on the recording medium, the temperature of the recording medium is similarly increased with the temperature increase. As a result, the coercive force is reduced and the O/W characteristics are improved.
［実施例］
以下、本発明を具体化した一実施例を図面を参照して説
明する。[Example] Hereinafter, an example embodying the present invention will be described with reference to the drawings.
第１図に示すように、磁気ヘッド１はフェライト等の強
磁性体よりできているコア半体２ａ、２ｂで構成されて
おり、磁気ギャップ３の記録媒体の移動方向（矢印方向
）手前側にＮ ｉ −３ｉ系の合金材料で形成された感
温磁性体４が設けられている。感温磁性体４は比較的低
い温度領域にキュリー温度（Ｔｃ）を有し、ＴＣを境に
磁気特性が大きく変化する。As shown in FIG. 1, the magnetic head 1 is composed of core halves 2a and 2b made of ferromagnetic material such as ferrite, and is located at the front side of the magnetic gap 3 in the direction of movement of the recording medium (in the direction of the arrow). A temperature-sensitive magnetic body 4 made of a Ni-3i alloy material is provided. The temperature-sensitive magnetic material 4 has a Curie temperature (Tc) in a relatively low temperature range, and its magnetic properties change significantly after TC.
感温磁性体４にはヒステリシス損と渦電流損等の鉄損の
多い磁性体を選定しており、高周波磁界で励磁すると、
第２図に示した鉄損の温度特性を有する。従って、磁心
温度がＴＣ以下では発熱量が比較的大きく、ＴＯ以上で
は発熱量がほとんどない機能を磁性体自身が有しており
、Ｔｃを温度基準値とした制御が可能となる。A magnetic material with high core losses such as hysteresis loss and eddy current loss is selected for the temperature-sensitive magnetic material 4, and when excited with a high frequency magnetic field,
It has the temperature characteristics of iron loss shown in Figure 2. Therefore, the magnetic body itself has a function in which the amount of heat generated is relatively large when the core temperature is below TC, and almost no amount of heat is generated when the temperature is above TO, and control using Tc as the temperature reference value is possible.
磁気ヘッド１は、記録媒体への記録時において、記録電
流を流した励磁コイル（図示せず）からの磁束がコア半
体２ａ、 ２ｂ内を流れる。この磁束は、磁気ギャップ
３からのもれ磁束となり対接する記録媒体を磁化する。In the magnetic head 1, when recording on a recording medium, magnetic flux from an excitation coil (not shown) through which a recording current flows flows through the core halves 2a and 2b. This magnetic flux becomes a leakage flux from the magnetic gap 3 and magnetizes the recording medium that is in contact with it.
一方、記録媒体は一般に、第３図に示すように、抗磁力
の温度依存性があり、最も広く使用されているＣｏ添加
酸化物磁性体の場合−０，３％／ｄｅｇの温度計数をも
っている。On the other hand, recording media generally have a temperature dependence of coercive force, as shown in Figure 3, and the most widely used Co-added oxide magnetic material has a temperature coefficient of -0.3%/deg. .
従って、抗磁力が低下することにより、記録媒体が磁化
され易い状態になり記録磁界は媒体を十分に磁化させる
ことができる。記録時に磁気ヘッド１のコア半休２ａ、
２ｂを通った磁束は、同時に感温磁性体４も高周波励磁
するため、その温度はキュリー点まで上昇し、対接する
記録直前の記録媒体が加熱させられることになる。Therefore, by reducing the coercive force, the recording medium becomes easily magnetized, and the recording magnetic field can sufficiently magnetize the medium. During recording, the core half of the magnetic head 1 is closed 2a,
The magnetic flux passing through 2b simultaneously excites the temperature-sensitive magnetic body 4 with high frequency, so that its temperature rises to the Curie point, and the recording medium that is in contact with it immediately before recording is heated.
記録媒体としてのフロッピーディスクは、磁気ヘッド１
と記録媒体との接触記録であり、感温磁性体４から記録
媒体への熱伝導はきわめて良いことから、記録時に媒体
の抗磁力を下げることにより高密度記録時にでもＯ／Ｗ
特性を向上することができる。また、記録磁界により加
熱されるため特にヒーター等も必要なく非常に簡便に行
うことができる。更に、感温磁性体４はキュリー点以上
は絶対に上昇しないので、加熱により記録媒体のベース
を溶かしてしまう危険性もない。A floppy disk as a recording medium has a magnetic head 1.
This is contact recording between the temperature-sensitive magnetic material 4 and the recording medium, and the heat conduction from the temperature-sensitive magnetic material 4 to the recording medium is extremely good.
Characteristics can be improved. Further, since heating is performed by the recording magnetic field, there is no need for a heater or the like, making it very easy to perform. Furthermore, since the temperature-sensitive magnetic material 4 never rises above its Curie point, there is no risk of melting the base of the recording medium due to heating.
尚、感温磁性体４としては、Ｎｉ−３ｉ系合金に限定さ
れることなく、Ｎ １−Ｃｕ系若しくはＦｅ−１）を系
合金再挿々の材料を利用できることは言うまでもない。It goes without saying that the temperature-sensitive magnetic material 4 is not limited to the Ni-3i alloy, but may also be made of N1-Cu or Fe-1 alloys.
［発明の効果］
以上詳述したことから明らかなように、本発明によれば
、記録磁束を利用して感温磁性体を加熱することにより
媒体の抗磁力を下げて記録を行うようにしたので、非常
に簡単な構成で十分な記録ができ、Ｏ／Ｗ等の記録特性
を向上することができる効果を有する。[Effects of the Invention] As is clear from the detailed description above, according to the present invention, recording is performed by lowering the coercive force of the medium by heating the temperature-sensitive magnetic material using recording magnetic flux. Therefore, sufficient recording can be performed with a very simple configuration, and the recording characteristics such as O/W can be improved.
第１図は、本発明を具体化した一実施例を示す磁気ヘッ
ドの斜視図、第２図は感温磁性体の温度・発熱特性を示
す様式図、第３図は記録媒体の抗磁力の温度特性を示す
様式図、第４図は従来の磁気ヘッドの斜視図である。
図中、２ａ及び２ｂはコア半休、３は磁気ギャップ、４
は感温磁性体である。FIG. 1 is a perspective view of a magnetic head showing an embodiment of the present invention, FIG. 2 is a style diagram showing the temperature and heat generation characteristics of the temperature-sensitive magnetic material, and FIG. 3 is a diagram showing the coercive force of the recording medium. FIG. 4, a style diagram showing temperature characteristics, is a perspective view of a conventional magnetic head. In the figure, 2a and 2b are half cores, 3 is a magnetic gap, and 4
is a temperature-sensitive magnetic material.
Claims (1)
ャップ（３）を有し、一方向に相対的に移動される記録
媒体の表面に接触して各種データの記録・再生を行う磁
気ヘッドにおいて、 前記記録媒体と摺接する面で、前記磁気ギャップ（３）
に対して記録媒体の相対移動方向側に鉄損の大きい感温
磁性体（４）が配置されていることを特徴とする磁気ヘ
ッド。[Claims] 1. A magnetic gap (3) formed by a pair of cores (2a, 2b), which records various data by contacting the surface of a recording medium that is relatively moved in one direction. - In the magnetic head that performs reproduction, the magnetic gap (3) is formed on the surface that makes sliding contact with the recording medium.
A magnetic head characterized in that a temperature-sensitive magnetic body (4) having a large core loss is arranged on the side in the direction of relative movement of a recording medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP594388A JPH01182905A (en) | 1988-01-14 | 1988-01-14 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP594388A JPH01182905A (en) | 1988-01-14 | 1988-01-14 | Magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01182905A true JPH01182905A (en) | 1989-07-20 |
Family
ID=11624983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP594388A Pending JPH01182905A (en) | 1988-01-14 | 1988-01-14 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01182905A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0665541A2 (en) * | 1994-01-31 | 1995-08-02 | Matsushita Electric Industrial Co., Ltd. | Information recording and reproducing device |
-
1988
- 1988-01-14 JP JP594388A patent/JPH01182905A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0665541A2 (en) * | 1994-01-31 | 1995-08-02 | Matsushita Electric Industrial Co., Ltd. | Information recording and reproducing device |
| EP0665541A3 (en) * | 1994-01-31 | 1996-11-20 | Matsushita Electric Ind Co Ltd | Information recording and reproducing device. |
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