JP2553494B2 - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JP2553494B2 JP2553494B2 JP60096597A JP9659785A JP2553494B2 JP 2553494 B2 JP2553494 B2 JP 2553494B2 JP 60096597 A JP60096597 A JP 60096597A JP 9659785 A JP9659785 A JP 9659785A JP 2553494 B2 JP2553494 B2 JP 2553494B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- thin film
- recording
- head
- gap
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 〔技術分野〕 本発明は、磁気記録媒体に情報を書き込む記録ヘッド
の機能、および磁気記録媒体に記録された情報を読み出
す再生ヘッドの機能が１つに複合された磁気ヘッドに関
するものである。Description: TECHNICAL FIELD The present invention relates to a magnetic recording device in which the function of a recording head for writing information on a magnetic recording medium and the function of a reproducing head for reading information recorded on a magnetic recording medium are combined into one magnetic field. It is about the head.
例えば、フロッピーディスクドライブ、ビデオテープ
レコーダなどの磁気記録装置においては、記録ヘッドお
よび再生ヘッドを格別に配置した場合に生ずる両ヘッド
の角度調整およびトラック調整の困難性を解消するた
め、両ヘッドの機能が１つに複合された磁気ヘッドが用
いられる。For example, in a magnetic recording device such as a floppy disk drive or a video tape recorder, the functions of both heads are eliminated in order to eliminate the difficulty of angle adjustment and track adjustment of both heads, which occurs when the recording head and the reproducing head are specially arranged. A magnetic head in which the above are combined into one is used.
ところで、磁気ヘッドのギャップ長と記録効率および
再生効率との間には、次のような関係がある。即ち、記
録媒体に情報を書き込む場合には、ギャップ長が広い磁
気ヘッドを用いた方が記録効率が高く、深い書き込みが
可能となり、反対に記録媒体に記録された情報を読み出
す場合には、ギャップ長が狭い磁気ヘッドを用いた方が
再生効率が高くなる。一方、磁気ヘッドのギャップ長と
記録密度特性との間には、ギャップ長を広くすると記録
密度が小さくなり、ギャップ長を狭くすると記録密度が
大きくなるという関係がある。このため、ただ１つのギ
ャップ部を備え、記録ヘッドとしての機能と再生ヘッド
としての機能を使い分けるように構成された磁気ヘッド
においては、ギャップ長を広く設定しておけば記録効率
を向上することが可能となるが、反面、再生効率および
記録密度の低下をきたし、逆に、ギャップ長を狭く設定
すると再生効率および記録密度特性は向上するが、記録
効率が低下してしまうという相反する課題をかかえてい
る。By the way, there is the following relationship between the gap length of the magnetic head and the recording efficiency and the reproducing efficiency. That is, when writing information on a recording medium, a magnetic head having a wide gap length has higher recording efficiency and enables deep writing. On the contrary, when reading information recorded on the recording medium, a gap is used. The reproduction efficiency is higher when a magnetic head having a shorter length is used. On the other hand, between the gap length and the recording density characteristic of the magnetic head, there is a relation that the recording density becomes smaller as the gap length is widened and the recording density becomes larger as the gap length is narrowed. For this reason, in a magnetic head having a single gap portion and configured to selectively use the function as a recording head and the function as a reproducing head, it is possible to improve recording efficiency by setting a wide gap length. Although it is possible, on the other hand, the reproduction efficiency and the recording density decrease, and conversely, if the gap length is set narrower, the reproduction efficiency and the recording density characteristics improve, but the recording efficiency decreases. ing.
この点に関し、従来は、記録密度特性重視の立場か
ら、ギャップ長を狭くする方向にある。しかしながら、
ギャップ長を狭くすることは、上記のように、記録効率
の低下をもたらし、結果として次のような不具合を生ず
る。即ち、記録媒体としてメタルテープなど保持力の高
いものを用いた場合、これに記録するのに必要な磁界を
得ることができず、記録が浅くなって記録が不安定にな
る。また、消去ヘッドを備えず、既記録部の上から新た
な情報を重ね書きすることによって新たな情報を繰返し
記録するようにしたフロッピーディスクドライブなどの
磁気記録装置においては、深い記録ができないため、以
前に記録された情報が完全に消去されないなどの不具合
を生じ易い。In this regard, conventionally, from the standpoint of emphasizing the recording density characteristic, the gap length has been narrowed. However,
As described above, reducing the gap length causes a decrease in recording efficiency, resulting in the following problems. That is, when a recording medium having a high holding force such as a metal tape is used as the recording medium, a magnetic field necessary for recording on the recording medium cannot be obtained, and the recording becomes shallow and the recording becomes unstable. Further, in a magnetic recording device such as a floppy disk drive, which is not equipped with an erasing head and repeatedly records new information by overwriting new information on an already recorded portion, deep recording cannot be performed. Problems such as the fact that previously recorded information is not completely erased are likely to occur.
このような不具合を防止するため、従来、ギャップ突
き合せ部にコア部材を構成する磁性材料に比べて飽和磁
束密度および透磁率の高い磁性材料の薄膜を形成して、
ギャップ部の飽和磁束密度を高め、狭ギャップ化による
記録効率の低下を補償するようにした磁気ヘッドが知ら
れている。In order to prevent such a problem, conventionally, a thin film of a magnetic material having a higher saturation magnetic flux density and a higher magnetic permeability than that of the magnetic material forming the core member is formed in the gap abutting portion,
There is known a magnetic head in which the saturation magnetic flux density in the gap portion is increased to compensate for the decrease in recording efficiency due to the narrow gap.
しかしながら、上記の手段を施すことによる記録効率
の上昇率は、コア部材の飽和磁束密度とギャップ突き合
せ部に形成される磁性材料の飽和磁束密度の比によって
ほぼ定まるので、記録効率を任意に選択することができ
ないばかりでなく、磁気ヘッドの特性が不均一になると
いう欠点がある。例えば、コア部材としてMn−Znフェラ
イトを用い、また、高飽和磁束密度・高透磁率の磁性材
料としてアモリファスを用いた場合、Mn−Znフェライト
の飽和磁束密度は3000乃至3400ガウスであり、アモルフ
ァスの飽和磁束密度は、5000乃至7000ガウス（特公昭51
−73920号）であるので、この磁気ヘッドの記録効率
は、Mn−Znフェライトのみからなるコア材を用いたもの
に比して約1.5倍乃至2.3倍の間で不均一になることが判
る。However, the rate of increase of the recording efficiency by applying the above means is almost determined by the ratio of the saturation magnetic flux density of the core member and the saturation magnetic flux density of the magnetic material formed in the gap abutting portion, so that the recording efficiency can be arbitrarily selected. In addition to being unable to do so, there is the drawback that the characteristics of the magnetic head become non-uniform. For example, when Mn-Zn ferrite is used as the core member, and when Amorphofus is used as the magnetic material with high saturation magnetic flux density and high magnetic permeability, the saturation magnetic flux density of Mn-Zn ferrite is 3000 to 3400 Gauss, which is amorphous. Saturation magnetic flux density is 5000 to 7,000 gauss (Japanese Patent Publication No. 51
-73920), it can be seen that the recording efficiency of this magnetic head becomes non-uniform between about 1.5 times and 2.3 times that of a magnetic head using a core material consisting only of Mn-Zn ferrite.
本発明は上記した従来の磁気ヘッドの問題点を解消
し、記録効率および再生効率が高く、かつ、記録密度特
性に優れた磁気ヘッドを提供することにある。It is an object of the present invention to solve the problems of the conventional magnetic head described above, and to provide a magnetic head having high recording efficiency and reproducing efficiency and excellent recording density characteristics.
本発明は、上記の目的を達成するため、磁気記録媒体
に情報を書き込む記録ヘッドの機能、および磁気記録媒
体に記録された情報を読み出す再生ヘッドの機能が１つ
に複合された磁気ヘッドにおいて、２つのコア半体の対
向面に、当該コア半体を構成する磁性材料よりも飽和磁
束密度が高い磁性材料からなる第１の薄膜を形成し、こ
の第１の薄膜の表面の夫々に、透磁率が高く、かつ前記
第１の薄膜を構成する磁性材料よりも飽和磁束密度が低
い磁性材料からなる第２の薄膜を形成し、この第２の薄
膜の表面に形成されるギャップ突き合せ部に非磁性のギ
ャップ部材を介して前記２つのコア半体を結合した。In order to achieve the above object, the present invention provides a magnetic head in which the function of a recording head for writing information on a magnetic recording medium and the function of a reproducing head for reading information recorded on a magnetic recording medium are combined into one. A first thin film made of a magnetic material having a saturation magnetic flux density higher than that of the magnetic material forming the core halves is formed on the opposing surfaces of the two core halves, and a transparent film is formed on each of the surfaces of the first thin film. A second thin film made of a magnetic material having a high magnetic susceptibility and a saturation magnetic flux density lower than that of the magnetic material forming the first thin film is formed, and a gap abutting portion formed on the surface of the second thin film is formed. The two core halves were joined via a non-magnetic gap member.
第１図は本発明に係る磁気ヘッドの斜視図であり、第
２図は第１図に示す磁気ヘッドの平面図である。FIG. 1 is a perspective view of a magnetic head according to the present invention, and FIG. 2 is a plan view of the magnetic head shown in FIG.
これらの図において、1a,1bはコア半体、２はこのコ
ア半体1a,1bに形成された巻線窓、８はコア半体1a,1bの
対向面６および傾斜面７に形成された第１の薄膜、９は
第１の薄膜８上に積層された第２の薄膜、４は薄膜９の
突き合せ面に介設されたギャップ、５は一体に突き合わ
されたコア半体1a,1bの側面に形成される凹陥部を充填
する非磁性の充填材を示す。In these figures, 1a and 1b are core halves, 2 is a winding window formed in the core halves 1a and 1b, and 8 is formed on the facing surface 6 and the inclined surface 7 of the core halves 1a and 1b. The first thin film, 9 is the second thin film laminated on the first thin film 8, 4 is the gap provided in the abutting surface of the thin film 9, and 5 is the core halves 1a, 1b which are abutted together. 3 shows a non-magnetic filling material that fills a recess formed on the side surface of the.
コア半体1a,1bはMn−Znフェライトによって形成され
ており、所定のトラック幅ｗを有する対向面６の両側に
傾斜面７を形成してある。The core halves 1a and 1b are made of Mn-Zn ferrite, and inclined surfaces 7 are formed on both sides of the facing surface 6 having a predetermined track width w.
第１の薄膜８は、例えばセンダスト、アモルファスな
ど、コア半体1a,1bを構成するMn−Znフェライトに比べ
て飽和磁束密度および透磁率が高い材料をもって形成さ
れる。一方、第２の膜９は、例えばFe20Ni20Co38Si8B14
など、コア半体1a,1bを構成するMn−Znフェライトに比
して飽和磁束密度が低く、かつ、透磁率が高い磁性材料
によって形成される。これら第１および第２の薄膜8,9
は、スパッタリングなど公知に属する薄膜形成手段によ
って形成される。ギャップ４は、例えばSiOなどの非磁
性材料を、前記第１および第２の薄膜8,9と同様に、ス
パッタリングなどすることによって形成される。前記薄
膜９および前記ギャップ４の厚さは、設計上任意に選択
可能であるが、記録効率、再生効率および記録密度を考
慮した場合、前記薄膜９の厚さは1.5μｍ乃至2.0μｍ程
度、また前記ギャップ４の厚さは0.3μｍ乃至0.5μｍ程
度が良好である。The first thin film 8 is formed of a material such as sendust or amorphous having a higher saturation magnetic flux density and magnetic permeability than Mn-Zn ferrite forming the core halves 1a and 1b. On the other hand, the second film 9 is formed of, for example, Fe 20 Ni 20 Co 38 Si 8 B 14
And the like, the magnetic flux has a lower saturation magnetic flux density and a higher magnetic permeability than the Mn-Zn ferrite forming the core halves 1a and 1b. These first and second thin films 8, 9
Is formed by a known thin film forming means such as sputtering. The gap 4 is formed by sputtering a non-magnetic material such as SiO 2 as in the case of the first and second thin films 8 and 9. The thickness of the thin film 9 and the gap 4 can be arbitrarily selected in design, but in consideration of recording efficiency, reproducing efficiency and recording density, the thickness of the thin film 9 is about 1.5 μm to 2.0 μm, and The thickness of the gap 4 is preferably 0.3 μm to 0.5 μm.
上記実施例の磁気ヘッドは、ギャップ突き合せ部に低
飽和磁束密度の第２の薄膜９を形成したので、記録時、
該第２の薄膜９が磁気的に飽和してギャップ長が実質上
第１の薄膜８の対向面間の間隔ｔに拡大され、記録効率
を向上することができる。この場合、コア半体1a,1bの
対向面６に高飽和磁束密度の第１の薄膜８を形成したの
で、ギャップ部から分布の鋭い磁界が発生し、更に記録
効率を高めることができる。反面、再生時は、記録媒体
からの磁束密度が小さいので第２の薄膜９が磁気的に飽
和することがなく、狭幅に形成された本来のギャップ４
の厚さがギャップ長として機能するので、再生効率が高
くなる。In the magnetic head of the above-mentioned embodiment, since the second thin film 9 having a low saturation magnetic flux density is formed at the gap abutting portion, at the time of recording,
The second thin film 9 is magnetically saturated, and the gap length is substantially expanded to the interval t between the facing surfaces of the first thin film 8, so that the recording efficiency can be improved. In this case, since the first thin film 8 having a high saturation magnetic flux density is formed on the facing surfaces 6 of the core halves 1a and 1b, a sharp distribution magnetic field is generated from the gap portion, and the recording efficiency can be further improved. On the other hand, during reproduction, since the magnetic flux density from the recording medium is small, the second thin film 9 is not magnetically saturated, and the original gap 4 formed with a narrow width is used.
Since the thickness of the gap serves as the gap length, the regeneration efficiency is increased.
なお、上記実施例では、第２の薄膜９を、コア半体1
a,1bを構成する磁性材料よりも透磁率が高い材料にて形
成したので、磁気抵抗が小さく、該第２の薄膜層９の存
在によって再生効率が低下することを抑制できる利点を
有し、特に推奨される。しかしながら、第２の薄膜９の
膜厚が2.0μｍ以下である場合には、上記磁気抵抗の影
響が少ないので、前記第２の薄膜９の透磁率がコア半体
1a,1bを構成するMn−Znフェライトと同等ないしはそれ
以下であっても実用に供し得る。In the above embodiment, the second thin film 9 is used as the core half body 1.
Since it is formed of a material having a magnetic permeability higher than that of the magnetic material forming a and 1b, it has an advantage that the magnetic resistance is small and the reproduction efficiency is prevented from being lowered by the presence of the second thin film layer 9, Especially recommended. However, when the thickness of the second thin film 9 is 2.0 μm or less, the magnetic resistance of the second thin film 9 is small, so that the magnetic permeability of the second thin film 9 is the core half.
Even if it is equal to or less than the Mn-Zn ferrite constituting 1a and 1b, it can be put to practical use.
また、上記実施例では、第１の薄膜８を、コア半体1
a,1bを構成する磁性材料よりも透磁率が高い材料にて形
成したが、必ずしも透磁率が高い磁性材料でなくてもよ
く、コア半体1a,1bを構成する磁性材料よりも高い飽和
磁束密度を有すれば充分である。In the above embodiment, the first thin film 8 is replaced by the core half 1
Although it is formed of a material having a higher magnetic permeability than the magnetic material forming the a and 1b, it does not necessarily have to be a magnetic material having a high magnetic permeability, and a saturation flux higher than that of the magnetic material forming the core halves 1a and 1b. Having a density is sufficient.
さらに、上記実施例の磁気ヘッドは、コア半体1a,1b
としてMn−Znフェライトからなるものを用いてので、渦
電流損が少なく、かつ耐摩耗性に優れる。Furthermore, the magnetic heads of the above-mentioned embodiments are the core halves 1a, 1b.
Since it is made of Mn-Zn ferrite, the eddy current loss is small and the wear resistance is excellent.
本発明の要旨は、コア半体1a,1bの対向面６に、コア
半体1a,1bを構成する磁性材料よりも高飽和磁束密度の
磁性材料からなる第１の薄膜８を設けると共に、この第
１の薄膜８上に、この第１の薄膜８を構成する磁性材料
よりも低飽和磁束密度の磁性材料からなる第２の薄膜９
を積層した点に存するのであって、ヘッド各部の形状お
よび材料が上記実施例に限定されるものではない。これ
らについては、本発明の要旨を逸脱しない範囲で適宜設
計できる。The gist of the present invention is to provide the first thin film 8 made of a magnetic material having a higher saturation magnetic flux density than the magnetic material forming the core halves 1a, 1b on the facing surfaces 6 of the core halves 1a, 1b. On the first thin film 8, a second thin film 9 made of a magnetic material having a saturation magnetic flux density lower than that of the magnetic material forming the first thin film 8.
However, the shape and material of each part of the head are not limited to those in the above embodiment. These can be appropriately designed without departing from the scope of the present invention.
以上説明したように本発明によれば、記録時にギャッ
プ長が第１の薄膜の対向面にまで実質的に拡大するの
で、記録効率が高くなり、深い書き込みが可能となる。
従って、高保持力を有する記録済みの情報の上から重ね
書きするとによって再記録を行うようにした磁気記録装
置にも適用可能となる。一方、再生時にはギャップ長
が、狭幅に形成された本来のギャップ長となるので、再
生効率が高く、高密度化の要請をも満足することができ
る。かように、本発明によれば、予じめ第２の薄膜の厚
さを適宜調整しておくことによって、記録時および再生
時のギャップ長を夫々所定の値に調整することができる
ので、ギャップ突き合せ部に高飽和磁束密度の薄膜を形
成することによりギャップ長の狭幅化による記録効率の
低下を補償するようにした従来の磁気ヘッドに比べて、
磁気ヘッドの実用性および汎用性を大幅に向上すること
ができる。As described above, according to the present invention, the gap length is substantially expanded to the facing surface of the first thin film during recording, so that the recording efficiency is increased and the deep writing is possible.
Therefore, it can be applied to a magnetic recording device in which re-recording is performed by overwriting on recorded information having high coercive force. On the other hand, at the time of reproduction, the gap length becomes the original gap length formed to be narrow, so that the reproduction efficiency is high and the demand for higher density can be satisfied. As described above, according to the present invention, the gap length at the time of recording and the gap at the time of reproducing can be adjusted to the respective predetermined values by appropriately adjusting the thickness of the second thin film beforehand. Compared with a conventional magnetic head that is designed to compensate for the decrease in recording efficiency due to the narrowing of the gap length by forming a thin film of high saturation magnetic flux density in the gap abutting portion,
The practicality and versatility of the magnetic head can be greatly improved.
また、各コア半体の夫々に第１の薄膜と第２の薄膜と
を形成したので、記録時と再生時におけるギャップ長の
中心を一定にすることができ、記録信号と再生信号の同
期をとるための特別な回路を必要としないので、記録再
生装置の回路構成を簡単にできる。また、これと共に、
各コア半体の夫々に第１の薄膜と第２の薄膜とを形成し
たので、各コア半体を同一の製造工程を経て製造するこ
とができ、記録ヘッドの機能および再生ヘッドの機能が
１つに複合された磁気ヘッドの製造を容易なものにする
ことができる。さらに、各コア半体の夫々に高飽和磁束
密度材料からなる第１の薄膜を形成したので、ギャップ
に高密度の磁束を集中することができ、記録効率の高い
磁気ヘッドを構成できる。また、各コア半体の夫々に高
透磁率かつ低飽和磁束密度材料からなる第２の薄膜を形
成したので、再生時にコイルの周囲に高透磁率磁性材料
のループを構成することができ、再生効率の高い磁気ヘ
ッドを構成できる。Further, since the first thin film and the second thin film are formed in each of the core halves, the center of the gap length during recording and reproducing can be made constant, and the synchronization of the recording signal and the reproducing signal can be achieved. Since no special circuit for obtaining the data is required, the circuit configuration of the recording / reproducing apparatus can be simplified. Also, with this,
Since the first thin film and the second thin film are formed on each core half, each core half can be manufactured through the same manufacturing process, and the function of the recording head and the function of the reproducing head are 1 It is possible to easily manufacture the magnetic head combined with one another. Further, since the first thin film made of the high saturation magnetic flux density material is formed in each of the core halves, the high density magnetic flux can be concentrated in the gap, and the magnetic head with high recording efficiency can be constructed. In addition, since the second thin film made of a material having a high magnetic permeability and a low saturation magnetic flux density is formed in each of the core halves, a loop of a magnetic material having a high magnetic permeability can be formed around the coil during reproduction. A highly efficient magnetic head can be constructed.
添付の図面は本発明の実施例を示すものであって、第１
図は磁気ヘッドの斜視図、第２図は第１図に示す複合型
磁気ヘッドの平面図である。 1a,1b:コア半体、2:巻線窓、4:再生用ギャップ、5:非磁
性充填材、6:対向面、7:傾斜面、8:第１の薄膜、9:第２
の薄膜。The accompanying drawings show an embodiment of the present invention,
2 is a perspective view of the magnetic head, and FIG. 2 is a plan view of the composite magnetic head shown in FIG. 1a, 1b: half core, 2: winding window, 4: reproducing gap, 5: non-magnetic filler, 6: facing surface, 7: inclined surface, 8: first thin film, 9: second
Thin film.
Claims (1)
の機能、および磁気記録媒体に記録された情報を読み出
す再生ヘッドの機能が１つに複合された磁気ヘッドにお
いて、２つのコア半体の対向面に、当該コア半体を構成
する磁性材料よりも飽和磁束密度が高い磁性材料からな
る第１の薄膜を形成し、この第１の薄膜の表面の夫々
に、透磁率が高く、かつ前記第１の薄膜を構成する磁性
材料よりも飽和磁束密度が低い磁性材料からなる第２の
薄膜を形成し、この第２の薄膜の表面に形成されるギャ
ップ突き合せ部に非磁性のギャップ部材を介して前記２
つのコア半体を結合したことを特徴とする磁気ヘッド。1. In a magnetic head in which the function of a recording head for writing information on a magnetic recording medium and the function of a reproducing head for reading information recorded on a magnetic recording medium are combined into one, two core halves face each other. A first thin film made of a magnetic material having a saturation magnetic flux density higher than that of the magnetic material forming the core half body is formed on the surface, and the magnetic permeability is high and the first thin film is formed on each of the surfaces of the first thin film. Forming a second thin film made of a magnetic material having a saturation magnetic flux density lower than that of the magnetic material forming the first thin film, and interposing a non-magnetic gap member in the gap abutting portion formed on the surface of the second thin film. 2
A magnetic head characterized by combining two core halves.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60096597A JP2553494B2 (en) | 1985-05-09 | 1985-05-09 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60096597A JP2553494B2 (en) | 1985-05-09 | 1985-05-09 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61255512A JPS61255512A (en) | 1986-11-13 |
| JP2553494B2 true JP2553494B2 (en) | 1996-11-13 |
Family
ID=14169294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60096597A Expired - Fee Related JP2553494B2 (en) | 1985-05-09 | 1985-05-09 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2553494B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6087411A (en) * | 1983-10-20 | 1985-05-17 | Yaskawa Electric Mfg Co Ltd | Magnetic head |
| JPS60123716U (en) * | 1984-01-27 | 1985-08-21 | ティーディーケイ株式会社 | magnetic head |
-
1985
- 1985-05-09 JP JP60096597A patent/JP2553494B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61255512A (en) | 1986-11-13 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |