JPH0157405B2 - - Google Patents
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- Publication number
- JPH0157405B2 JPH0157405B2 JP56046746A JP4674681A JPH0157405B2 JP H0157405 B2 JPH0157405 B2 JP H0157405B2 JP 56046746 A JP56046746 A JP 56046746A JP 4674681 A JP4674681 A JP 4674681A JP H0157405 B2 JPH0157405 B2 JP H0157405B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- coil
- main
- pole
- tip
- 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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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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】
本発明は、磁気ヘツド、特に垂直記録方法によ
る磁気ヘツドに係わる。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and particularly to a magnetic head using a perpendicular recording method.
高周波（短波長）信号の記録を行う場合、磁気
テープに磁気ヘツドとの相対的移行方向に沿う方
向の磁化によつて記録するいわゆる長手記録方法
によるよりも、磁気テープの厚さ方向の磁化、い
わゆる垂直記録方法による方が有利であることが
知られている。これは長手記録方法では記録信号
が短波長になるほど自己減磁界が大きくなるに比
し、垂直記録方法では磁性層内の自己減磁界が小
さくなる性質をもつことに因る。 When recording high frequency (short wavelength) signals, magnetization in the thickness direction of the magnetic tape is preferred, rather than the so-called longitudinal recording method in which the magnetic tape is recorded by magnetization in the direction of relative movement with the magnetic head. It is known that the so-called perpendicular recording method is more advantageous. This is because in the longitudinal recording method, the self-demagnetizing field becomes larger as the recording signal becomes shorter in wavelength, whereas in the perpendicular recording method, the self-demagnetizing field in the magnetic layer becomes smaller.
この垂直記録方法に用いられる磁気ヘツドとし
ては、種々のものが提案されているが、この垂直
記録方法において、その記録（磁化）を理想的に
行うためには、磁気ヘツドから出る磁界の主成分
が磁気媒体にできるだけ垂直になつている必要が
ある。このような磁気ヘツドｈとしては、第１図
に示すように、磁気記録媒体１を挾んで対向する
ように、例えばパーマロイ薄膜より成る主磁極２
と、補助磁極３とを有し、この補助磁極３にコイ
ル４が巻装された補助磁極励磁型磁気ヘツドがあ
る。 Various types of magnetic heads have been proposed for use in this perpendicular recording method, but in order to ideally perform recording (magnetization) in this perpendicular recording method, the main component of the magnetic field emitted from the magnetic head must be must be as perpendicular to the magnetic medium as possible. As shown in FIG. 1, such a magnetic head h includes a main magnetic pole 2 made of, for example, a permalloy thin film, which faces the magnetic recording medium 1 between them.
There is an auxiliary pole excitation type magnetic head which has a auxiliary magnetic pole 3 and a coil 4 wound around the auxiliary magnetic pole 3.
しかしながら、この場合、媒体１の背後に、媒
体１に接近して補助磁極３を置く必要があること
から、実際の組立や、磁気媒体の装着などの取扱
い操作が繁雑となる欠点がある。 However, in this case, since it is necessary to place the auxiliary magnetic pole 3 behind the medium 1 and close to the medium 1, there is a drawback that the actual assembly and handling operations such as mounting of the magnetic medium are complicated.
このような欠点を回避するために、第２図に示
すように、磁気媒体１として、非磁性ベース５上
に高透磁率材層６によつて裏打ちされた磁性層７
を設けた構造のものが提案された。この場合、そ
の磁性層７に対向して主磁極励磁型単磁極ヘツド
ｈを配置してその記録を行つても、すぐれた記録
感度、記録特性が得られる。 In order to avoid such drawbacks, as shown in FIG.
A structure with a structure was proposed. In this case, excellent recording sensitivity and recording characteristics can be obtained even if a main pole excitation type single magnetic pole head h is arranged opposite to the magnetic layer 7 for recording.
この種磁気ヘツドｈの主磁極２は、その厚さが
0.5〜3μｍ程度のパーマロイ、センダスト等の強
磁性薄膜より成り、この薄膜主磁極２を励磁する
コイル４、すなわち記録巻線は、例えば薄膜主磁
極２の先端付近の周囲にSiO2、Al2O3、Si3N4等
の絶縁膜を介して被着形成した薄膜コイルによつ
て形成し得る。この場合、コイル４によつてその
励磁を効率良く行うには、コイル４の前方端が、
磁気媒体との摺動面に臨む主磁極２の先端と一致
するように配置することが望まれる。ところが、
このようにコイル４の前方端が磁気媒体との摺動
面にコイル４が臨む場合、磁気媒体の磁性層が導
電性を有する場合、この媒体によつてコイル４を
短絡してしまう。また、仮りに媒体が絶縁性のも
のであつても、一般にコイル４を構成するような
良導電性の金属は、例えば銅、アルミニウム、
銀、金のような比較的軟い金属であるので、これ
が磁気媒体と摺接しているうちに、この摺接縁が
伸長して短絡事故を招来する場合もある。また、
このようにコイルが磁気媒体と近接している場
合、主磁極２によつて生じる記録磁界以外に、コ
イルからの磁界が直接的に媒体に与えられる。そ
してこのコイルによつて作られる磁界の広がりは
大きいので、磁気媒体に与えられる記録磁界が広
がつてしまつて高密度記録を阻害することにな
る。これらの欠点を回避するには、コイルの先端
を主磁極２の先端より、すなわち磁気媒体との摺
動面より少し後退させれば良い。すなわち、この
励磁コイルを少し後退させることによつて、コイ
ルが直接媒体に接触することを回避でき、しかも
励磁コイルによる磁界は、コイルが少し離間して
も急激に減少するのでこのコイルの少しの後退
で、このコイルによる磁界が直接磁気媒体に与え
る影響を小さくすることができる。しかしなが
ら、反面このようにすると、主磁極２のコイルが
巻回された部分においては強く磁化されるが、主
磁極２のコイル巻回部より突出した先端部では、
その磁化レベルが急激に低下する。これは、励磁
コイル４が、主磁極２にほぼ密接して巻かれてい
て、そのコイル巻回径が比較的小さいこと、コイ
ル端部より離間するとその磁界は急激に減少する
ものであること、主磁極２は薄膜であつてその磁
気抵抗が高いことなどに因る。第３図中実線曲線
８は、主磁極２上のその軸心方向成分の磁化の強
さByの分布を示したもので、横軸は主磁極２の
軸心ｙ上の位置を示し、その先端を０位置とし、
コイル４の先端の位置が−50μｍの位置にある場
合である。また、同図において破線曲線９は、平
行磁界による励磁をなした場合を示す。曲線８よ
り明らかなように、主磁極２の、コイル４より突
出した先端では急激に磁化が減少している。これ
に比し平行磁界によるときは主磁極２の先端まで
励磁される。したがつて主磁極２に対する励磁は
平行磁界によることが望ましく、このような平行
磁界を得るには、コイル４の巻径を大きくすれば
良い。ところがこのようにコイル４の巻径を大き
くすると、記録効率が悪くなり、大きな記録電流
を必要としてくる。そこでこれを改善するため
に、第４図に示すように、薄膜主磁極２の一方の
面、或いは両方の面に高透磁率の補助コア１０を
主磁極２の先端、すなわち、磁気媒体との摺動面
より後退させた位置に配置させることが考えられ
る。尚、この場合、その励磁コイル４は、補助コ
ア１０上のできるだけ先端部分に巻装する方が効
率が良いことは明らかである。 The main magnetic pole 2 of this kind of magnetic head h has a thickness of
The coil 4, that is, the recording winding, is made of a ferromagnetic thin film such as permalloy or sendust with a thickness of about 0.5 to 3 μm, and excites the thin film main pole 2. For example, the coil 4, that is, the recording winding, is made of a ferromagnetic thin film such as permalloy or sendust with a thickness of about 0.5 to 3 μm. It can be formed by a thin film coil deposited through an insulating film such as 3 , Si 3 N 4 or the like. In this case, in order to efficiently excite the coil 4, the front end of the coil 4 must be
It is desirable to arrange it so that it coincides with the tip of the main pole 2 facing the sliding surface with the magnetic medium. However,
In this way, when the front end of the coil 4 faces the sliding surface with the magnetic medium, if the magnetic layer of the magnetic medium has conductivity, the coil 4 will be short-circuited by this medium. Furthermore, even if the medium is insulating, generally the highly conductive metal that constitutes the coil 4 is, for example, copper, aluminum,
Since it is a relatively soft metal such as silver or gold, while it is in sliding contact with the magnetic medium, the sliding contact edge may expand, causing a short circuit accident. Also,
When the coil is in close proximity to the magnetic medium in this way, in addition to the recording magnetic field generated by the main magnetic pole 2, the magnetic field from the coil is directly applied to the medium. Since the spread of the magnetic field created by this coil is large, the recording magnetic field applied to the magnetic medium is spread, which impedes high-density recording. In order to avoid these drawbacks, the tip of the coil may be set back a little from the tip of the main magnetic pole 2, that is, from the sliding surface with the magnetic medium. In other words, by retracting this excitation coil a little, it is possible to avoid direct contact of the coil with the medium.Moreover, the magnetic field due to the excitation coil decreases rapidly even if the coil is moved a little apart. By retreating, the influence that the magnetic field from this coil has directly on the magnetic medium can be reduced. However, when doing this, the part of the main pole 2 where the coil is wound is strongly magnetized, but the tip part of the main pole 2 that protrudes from the coil winding part is magnetized.
Its magnetization level drops rapidly. This is because the excitation coil 4 is wound almost closely around the main magnetic pole 2 and the coil winding diameter is relatively small, and the magnetic field decreases rapidly when separated from the end of the coil. This is because the main magnetic pole 2 is a thin film and has high magnetic resistance. The solid line curve 8 in FIG. 3 shows the distribution of the magnetization strength By of the axial component on the main magnetic pole 2, and the horizontal axis shows the position on the axis y of the main magnetic pole 2. With the tip at the 0 position,
This is a case where the tip of the coil 4 is at a position of -50 μm. Further, in the same figure, a broken line curve 9 indicates the case where excitation is performed by a parallel magnetic field. As is clear from the curve 8, the magnetization rapidly decreases at the tip of the main pole 2 that protrudes from the coil 4. In contrast, when a parallel magnetic field is used, the tip of the main pole 2 is excited. Therefore, it is desirable that the main magnetic pole 2 is excited by a parallel magnetic field, and in order to obtain such a parallel magnetic field, the winding diameter of the coil 4 may be increased. However, when the winding diameter of the coil 4 is increased in this manner, recording efficiency deteriorates and a large recording current is required. Therefore, in order to improve this, as shown in FIG. 4, an auxiliary core 10 with high magnetic permeability is placed on one or both surfaces of the thin film main pole 2 at the tip of the main pole 2, that is, in contact with the magnetic medium. It is conceivable to arrange it at a position set back from the sliding surface. In this case, it is clear that it is more efficient to wind the excitation coil 4 as close to the tip of the auxiliary core 10 as possible.
本発明者等は、このような補助コアを具備する
磁気ヘツドにおいて、主磁極先端部分の記録磁界
の大きさは、主磁極先端部分の位置の励磁界の大
きさ、すなわち、主磁極をとり除いた状態の、コ
イルが巻装された補助コアのみが存在する場合の
主磁極先端部分の位置における磁界の大きさに依
存していることを究明した。したがつて最も効率
良く記録するには、主磁極先端位置に一定の記録
電流を流したとき、最も強い磁界が出るようにす
ればよい。一般にコイルの巻径が大きいほどコイ
ルの中心軸上でのコイルから離れるにしたがつて
生じる磁界の減衰は小さい。一方、コイルの中心
軸上の磁界は、コイルの径が大きいほど小さくな
る。したがつて主磁極先端位置の励磁磁界を最大
にするには、コイルの巻回径、配置位置等に適当
な選定が必要と思われる。 The present inventors believe that in a magnetic head equipped with such an auxiliary core, the magnitude of the recording magnetic field at the tip of the main pole is equal to the magnitude of the excitation field at the tip of the main pole, that is, when the main pole is removed. It was determined that this depended on the magnitude of the magnetic field at the position of the main pole tip when only the auxiliary core around which the coil was wound was present. Therefore, for most efficient recording, the strongest magnetic field should be generated when a constant recording current is passed through the tip of the main pole. Generally, the larger the winding diameter of the coil, the smaller the attenuation of the magnetic field that occurs as the distance from the coil on the central axis of the coil increases. On the other hand, the larger the diameter of the coil, the smaller the magnetic field on the central axis of the coil. Therefore, in order to maximize the excitation magnetic field at the tip of the main pole, it is necessary to appropriately select the winding diameter, arrangement position, etc. of the coil.
本発明は、上述した考察、究明に基き、更に
種々の実験考察を重ねた結果、記録効率の高い垂
直記録用の磁気ヘツドを提供するに至つた。 The present invention is based on the above-mentioned considerations and investigations, and as a result of various experimental studies, it has been possible to provide a magnetic head for perpendicular recording with high recording efficiency.
第５図以下を参照して本発明を説明するに、図
中Ｈは本発明による磁気ヘツドを全体として示
す。 The present invention will be described with reference to FIG. 5 and subsequent figures, in which H generally indicates a magnetic head according to the present invention.
本発明においては、例えば第５図または第６図
に示すように、例えば厚さｔが0.5〜3μｍのパー
マロイ、センダスト等の磁性薄膜より成る主磁極
２を設け、その両面または一方の面に、高透磁率
の例えばMn−Znフエライト、Ni−Znフエライ
トより成る補助コア１０を磁気的に密に結合配置
する。この補助コア１０は、主磁極２の磁気媒体
との摺動面に臨む先端より距離ｌだけ後退した位
置にその先端が位置するように配置される。そし
て、この補助コア１０上に、すなわち両補助コア
１０とこれら間に挾み込まれた主磁極２を内部に
配置するように、コイル４をその先端面が、補助
コア１０の先端と一致するように、できるだけ補
助コア１０の先方に位置させて、例えば導線の巻
回によつて巻装する。この場合、主磁極２の一方
の面からこれに対向するコイル４の内面までの距
離をａとし、このコイル４の巻回厚をｂとすると
き、、主磁極２の先端と補助コア１０の先端との
間の距離ｌが、その実用範囲のｌ＝10〜200μｍ
の範囲で（ａ＋ｂ／２）／ｌが0.55〜2.4の範囲とな
るように選定する。この選定の理由は、第７図及
び第８図に夫々第５図及び第６図の構造のものに
おいて、（ａ＋ｂ／２）／ｌを変化させたときの、主
磁極２の先端におけるその軸心方向の成分の磁界
をみた結果に基く。第７図及び第８図において、
その磁界は、これの最大の値を100％としこれに
対する相対的な値として表示したものである。尚
第７図において曲線１１，１２及び１３は、第５
図に示したように、主磁極２を挾んで対称的に配
置された対の補助コア１０の夫々の先端位置を主
磁極２の先端からの距離がｌ＝30μｍ、ｌ＝50μ
ｍ、ｌ＝100μｍとなるように選定した場合であ
り、第８図において曲線１４，１５及び１６は、
第６図に示した主磁極２の一側に配置された補助
コア１０の先端位置を主磁極２の先端からの距離
がｌ＝30μｍ、ｌ＝50μｍ、ｌ＝100μｍとなるよ
うに選定した場合である。第７図をみると、（ａ
＋ｂ／２）／ｌ＝1.3で磁界の強さは最大となり、
（ａ＋ｂ／２）／ｌ＝0.8〜2.0でその−２％（±１
％）程度の減少がみられ、（ａ＋ｂ／２）／ｌ＝0.65
〜2.4で−４％（±２％）の減少となつている。
そして、第７図及び第８図を比較するに、補助コ
ア１０が第５図及び第６図に示されるように、主
磁極２の両面に補助コアを設ける場合も、片面に
設ける場合も、主磁極２の先端における磁界への
影響の傾向はほぼ一致しており、第７図及び第８
図から（ａ＋ｂ／２）／ｌは、0.55〜2.4の範囲で主
磁極２の先端の磁界が効果的に高められることが
わかり、ここに（ａ＋ｂ／２）を0.55〜2.4に選定
する所以がある。 In the present invention, as shown in FIG. 5 or 6, for example, a main magnetic pole 2 made of a magnetic thin film such as permalloy or sendust with a thickness t of 0.5 to 3 μm is provided, and on both or one side thereof, An auxiliary core 10 made of, for example, Mn--Zn ferrite or Ni--Zn ferrite having high magnetic permeability is magnetically closely coupled and arranged. The auxiliary core 10 is arranged such that its tip is located at a position retreating by a distance l from the tip of the main pole 2 facing the sliding surface with the magnetic medium. Then, the tip surface of the coil 4 is aligned with the tip of the auxiliary core 10 so that both the auxiliary cores 10 and the main magnetic pole 2 sandwiched between them are placed inside the auxiliary core 10. As such, it is positioned as far forward as possible to the auxiliary core 10 and is wound, for example, by winding a conducting wire. In this case, when the distance from one surface of the main magnetic pole 2 to the inner surface of the coil 4 facing it is a, and the winding thickness of this coil 4 is b, the distance between the tip of the main magnetic pole 2 and the auxiliary core 10 is The distance l between the tip and the practical range l = 10 to 200 μm
(a+b/2)/l is selected to be in the range of 0.55 to 2.4. The reason for this selection is that the axis at the tip of the main magnetic pole 2 when changing (a+b/2)/l in the structures shown in FIGS. 5 and 6, respectively, is shown in FIGS. 7 and 8. This is based on the results of looking at the magnetic field component in the direction of the heart. In Figures 7 and 8,
The magnetic field is expressed as a value relative to the maximum value of 100%. In addition, curves 11, 12 and 13 in FIG.
As shown in the figure, the respective tip positions of the pair of auxiliary cores 10 arranged symmetrically with the main magnetic pole 2 in between are set at distances l=30 μm and l=50 μm from the tip of the main magnetic pole 2.
This is the case where m, l = 100 μm, and curves 14, 15 and 16 in Fig. 8 are
When the tip position of the auxiliary core 10 placed on one side of the main magnetic pole 2 shown in FIG. 6 is selected so that the distance from the tip of the main magnetic pole 2 is l = 30 μm, l = 50 μm, l = 100 μm. It is. Looking at Figure 7, (a
The strength of the magnetic field reaches its maximum when +b/2)/l = 1.3, and it decreases by about -2% (±1%) when (a+b/2)/l = 0.8 to 2.0. /l = 0.65 to 2.4, resulting in a decrease of -4% (±2%).
Comparing FIGS. 7 and 8, it is found that whether the auxiliary core 10 is provided on both sides of the main magnetic pole 2 as shown in FIGS. 5 and 6, or on one side, The trends of the influence on the magnetic field at the tip of the main magnetic pole 2 are almost the same, as shown in Figures 7 and 8.
From the figure, it can be seen that the magnetic field at the tip of the main magnetic pole 2 is effectively increased when (a+b/2)/l is in the range of 0.55 to 2.4, and the reason for selecting (a+b/2) in the range of 0.55 to 2.4 is as follows. be.
尚、第６図に示すように、補助コア１０を、主
磁極２の一側面にのみ配置する場合において、主
磁極２のその補助コアが配置されていない側の面
からこれに対向するコイル４の内周面までの距離
ｄを変化させて、主磁極２の先端における同様の
磁界を測定したところ第９図の結果が得られた。
ここの場合ｌ＝50μｍ、ａ＝50μｍ、ｂ＝20μｍと
し、コイル４の長さｃを50μｍと選定した場合で
ある。これより明らかなように、ｄｂで主磁極
先端の磁界が大となるので、補助コア１０を主磁
極(2)の一側にのみ配置する場合は、ｄｂの関係
に選定することが望ましい。 As shown in FIG. 6, when the auxiliary core 10 is disposed only on one side of the main magnetic pole 2, the coil 4 facing this from the side of the main magnetic pole 2 where the auxiliary core is not disposed. When the same magnetic field at the tip of the main magnetic pole 2 was measured while changing the distance d to the inner circumferential surface of the main magnetic pole 2, the results shown in FIG. 9 were obtained.
In this case, l=50 μm, a=50 μm, b=20 μm, and the length c of the coil 4 is selected to be 50 μm. As is clear from this, the magnetic field at the tip of the main magnetic pole becomes large at db, so when the auxiliary core 10 is disposed only on one side of the main magnetic pole (2), it is desirable to select the relationship db.
また、補助コア１０は、そのコイル４が巻装さ
れる先端側において、前述したように（ａ＋
ｂ／２）／ｌが0.55〜2.4となる関係にその値ａが選
定されるが、コイル４の巻装部より後端側におい
ては、その機械的強度を考慮してその厚さを大と
することができる。第１０図はこの場合の一例を
示し、更に、補助コア１０の先端には、主磁極２
の先端まで延長して、主磁極２を挾んで、非磁性
の例えばZnフエライトより成る補強体１７を接
着配置して主磁極２の先端の補強をはかることが
できる。尚、補助コア１０を、主磁極２の一側に
設ける場合は、この補助コア１０が配置されない
側の補強体１７を後方に一体に延長してこの補強
体と他方側の補強コア１０上にコイル４の巻装を
行うことができる。 In addition, the auxiliary core 10 has (a+
The value a is selected so that b/2)/l is 0.55 to 2.4, but the thickness of the rear end of the coil 4 should be increased in consideration of its mechanical strength. can do. FIG. 10 shows an example of this case, and furthermore, a main magnetic pole 2 is provided at the tip of the auxiliary core 10.
The tip of the main pole 2 can be reinforced by extending it to the tip of the main pole 2 and adhering a reinforcing body 17 made of non-magnetic material such as Zn ferrite to sandwich the main pole 2 . In addition, when the auxiliary core 10 is provided on one side of the main magnetic pole 2, the reinforcing body 17 on the side where the auxiliary core 10 is not arranged is integrally extended rearward, and is placed over this reinforcing body and the reinforcing core 10 on the other side. The coil 4 can be wound.
尚、第１０図の構造のものにおいて、各部の寸
法を例示すると、ｌ＝100μｍ、ａ＝150μｍ、ｂ
＝50μｍ、ｃ＝1.5μｍに、更に補助コア１０の後
方の厚さが大なる部分の厚さｅを１mm、その長さ
ｆを４mmに選定し得る。尚、磁気媒体１は、高透
磁率材層６を厚さ0.5μｍのパーマロイ層によつて
磁性層７を0.5μｍのCo−Cr層によつて形成した
ものを使用し得る。 In addition, in the structure shown in Fig. 10, the dimensions of each part are exemplified as l = 100 μm, a = 150 μm, b
= 50 μm, c = 1.5 μm, the thickness e of the thicker rear portion of the auxiliary core 10 can be selected to be 1 mm, and the length f thereof can be selected to be 4 mm. The magnetic medium 1 may be one in which the high magnetic permeability material layer 6 is a permalloy layer with a thickness of 0.5 μm, and the magnetic layer 7 is a Co--Cr layer with a thickness of 0.5 μm.
次に本発明による磁気ヘツドを得る製法の一例
を第１１図以下を参照して詳細に説明しよう。 Next, an example of a manufacturing method for obtaining a magnetic head according to the present invention will be explained in detail with reference to FIG. 11 and subsequent figures.
先ず、第１１図に示すように例えば直方体状の
磁性体２０を設け、その一の面に例えば板状の非
磁性体２７を接合した接合体３０を得る。磁性体
２０は、例えばMn−Zn系フエライト、或いはNi
−Zn系フエライトより構成し得、非磁性体２７
は、ガラス、セラミツクス、非磁性のMn系フエ
ライト等より構成し得るが、磁性体２０及び非磁
性体２７は、その熱膨脹率が近似することが望ま
れこれがため磁性体２０及び非磁性体２７は、
夫々磁性及び非磁性フエライトより構成すること
が望ましい。また、磁性体２０及び非磁性体２７
の接合は、ガラス融着、或いは、エポキシ接着
剤、若しくは無機系接着剤、或いは水ガラス等に
よつて行い得る。 First, as shown in FIG. 11, for example, a rectangular parallelepiped-shaped magnetic body 20 is provided, and a bonded body 30 is obtained by joining, for example, a plate-shaped non-magnetic body 27 to one surface thereof. The magnetic material 20 is made of, for example, Mn-Zn ferrite or Ni.
- Can be composed of Zn-based ferrite, non-magnetic material 27
can be made of glass, ceramics, non-magnetic Mn-based ferrite, etc. However, it is desirable that the coefficients of thermal expansion of the magnetic material 20 and the non-magnetic material 27 be similar, and therefore the magnetic material 20 and the non-magnetic material 27 are ,
Preferably, they are made of magnetic and non-magnetic ferrite, respectively. In addition, the magnetic material 20 and the non-magnetic material 27
The bonding can be performed by glass fusion, epoxy adhesive, inorganic adhesive, water glass, or the like.
次に第１１図に鎖線m1，m2，m3……に示す面
に沿つて、磁性体２０及び非磁性体２７の接合体
３０を所要の厚さに磁性体２０及び非磁性体２７
を横切るように切断して第１２図に示すように複
数の板状体３１を切り出す。そして、板状体３１
の磁性体２０及び非磁性体２７に差し渡る１主面
３１ａを鏡面仕上しこの面３１ａにSiO2、
Si3N4、Al2O3等の絶縁膜３２を被着し、これの
上に最終的に前述した主磁極２を構成する例え
ば、厚さ0.5〜3μｍのパーマロイ、センダスト等
より成る磁性薄膜２２を、蒸着、スパツタリング
等によつて被着する。 Next, along the planes shown by chain lines m 1 , m 2 , m 3 . . . in FIG.
A plurality of plate-shaped bodies 31 are cut out as shown in FIG. 12 by cutting across the plate. Then, the plate-shaped body 31
One main surface 31a spanning the magnetic material 20 and non-magnetic material 27 is mirror-finished, and this surface 31a is coated with SiO 2 ,
An insulating film 32 of Si 3 N 4 , Al 2 O 3 or the like is deposited, and on top of this is a magnetic thin film made of permalloy, sendust, etc. with a thickness of 0.5 to 3 μm, which will finally constitute the main magnetic pole 2 described above. 22 is applied by vapor deposition, sputtering, etc.
次に、第１３図に示すように、磁性薄膜２２
を、例えばフオトエツチングによつて所要の幅と
間隔をもつて平行をなす帯状に残して除去し、こ
の除去部に、非磁性の例えばSiO2より成る枕材
層３４を被着する。この枕材層３４は、その表面
が磁性薄膜２２の表面と同一平面を形成する厚さ
に選定される。 Next, as shown in FIG.
is removed by, for example, photo-etching, leaving behind parallel strips with a desired width and spacing, and a non-magnetic pillow material layer 34 made of, for example, SiO 2 is applied to this removed portion. The thickness of the pillow material layer 34 is selected so that its surface forms the same plane as the surface of the magnetic thin film 22.
一方、第１１図で説明したと同様の磁性体２０
と非磁性体２７との接合体３０から切り出した他
の板状体３１′を用意し、その一主面３１a′を鏡
面として、第１４図に示すようにこの面３１
a′を、第１３図の板状体３１の磁性薄膜２２と枕
材層３４との被着面側に接着する。この場合、板
状体３１′の面３１a′に予め溝３５を例えばエツ
チングによつて形成し、この溝３５内に接着剤３
６を充填することによつて、両板状体３１及び３
１′の接着を強固に行うことができるようになし
得る。 On the other hand, a magnetic body 20 similar to that explained in FIG.
Another plate-shaped body 31' cut out from the bonded body 30 of the non-magnetic material 27 and the non-magnetic material 27 is prepared, and one main surface 31a' thereof is made a mirror surface, and this surface 31 is shaped as shown in FIG.
a' is adhered to the side of the plate-shaped body 31 shown in FIG. 13 on which the magnetic thin film 22 and the pillow material layer 34 are adhered. In this case, a groove 35 is formed in advance on the surface 31a' of the plate-shaped body 31' by, for example, etching, and the adhesive 35 is filled in the groove 35.
6, both plate-like bodies 31 and 3
1' can be strongly bonded.
次に必要に応じて第１５図に示すように両板状
体３１及び３１′の外面を非磁性体２７側におい
て切り欠き、その厚さを他部に比し小とする。そ
して第１５図中鎖線n1，n2，n3……に示すよう
に、各帯状の磁性薄膜２２に関して切断し、第１
６図に示すようにその先端面を研磨し、ここに磁
気媒体との摺動面Ｓを構成する。このようにすれ
ば、この磁気媒体との摺動面Ｓに臨んで、磁性薄
膜２２から成る薄膜主磁極２が設けられ、この主
磁極２の先端部の両側には非磁性体２７から成る
補強体１７が配置され、。その後方に、磁性体２
０から成る補助コア１０が配置された本発明によ
る磁気ヘツドＨが得られる。この場合、主磁極２
に隣接して枕材層３４を配置するときは、磁気媒
体との摺動面に臨む主磁極２の両側の両補強体１
７間の間隙がこの枕材層３４によつて殆んど埋め
られることになり、この枕材層３４を設けない場
合の間隙に充填される接着剤の量、すなわち磁気
媒体との摺動面Ｓに臨む接着剤部を小とし、この
接着剤が摺動面Ｓに多く臨むことによるヘツドク
ロツキングの発生の縮少化をはかり得る。 Next, if necessary, as shown in FIG. 15, the outer surfaces of both plate-like bodies 31 and 31' are cut out on the non-magnetic body 27 side, so that the thickness thereof is smaller than that of the other parts. Then, as shown by chain lines n 1 , n 2 , n 3 . . . in FIG. 15, each strip-shaped magnetic thin film 22 is cut, and the first
As shown in FIG. 6, the tip surface is polished to form a sliding surface S with the magnetic medium. In this way, a thin main magnetic pole 2 made of a magnetic thin film 22 is provided facing the sliding surface S with the magnetic medium, and reinforcement made of a non-magnetic material 27 is provided on both sides of the tip of the main magnetic pole 2. A body 17 is arranged. Behind that, magnetic material 2
A magnetic head H according to the invention is obtained in which an auxiliary core 10 made of 0 is arranged. In this case, main pole 2
When arranging the pillow layer 34 adjacent to the reinforcing bodies 1 on both sides of the main pole 2 facing the sliding surface with the magnetic medium,
7 is almost completely filled by this pillow material layer 34, and the amount of adhesive filled in the gap when this pillow material layer 34 is not provided, that is, the sliding surface with the magnetic medium. By making the adhesive portion facing S smaller, more of this adhesive faces the sliding surface S, and the occurrence of headlocking can be reduced.
この磁気ヘツドＨには、その肉薄部に摺動面Ｓ
より後退した位置にコイル４が巻装される。尚、
このようにして得た磁気ヘツドにおいても、各部
の寸法配置関係は、前述したように選ばれる。 This magnetic head H has a sliding surface S on its thin part.
The coil 4 is wound at a position further back. still,
Also in the magnetic head thus obtained, the dimensional arrangement of each part is selected as described above.
また、この磁気ヘツドＨは、例えば第１７図に
示すように例えばビデオテープレコーダの回転ド
ラムにとりつけられる取付孔４１が穿設され、導
電性の端子パターン４２が被着されたヘツド取付
板４３上にとりつけられる。そして、各パターン
４２に磁気ヘツドＨのコイル４の端末が例えば半
田付けによつて電気的に接続される。 Further, as shown in FIG. 17, the magnetic head H is mounted on a head mounting plate 43, which has a mounting hole 41 for mounting on a rotating drum of a video tape recorder, for example, and has a conductive terminal pattern 42 attached thereto. be possessed by. Then, the terminals of the coils 4 of the magnetic head H are electrically connected to each pattern 42 by, for example, soldering.
上述したように、本発明による磁気ヘツドによ
れば、コイル４を磁気媒体との摺動面より後退さ
せて配置するにもかかわらず、記録効率の高い磁
気ヘツドを得ることができるものであり、本発明
による磁気ヘツドは、複数の主磁極２が配置され
た多素子磁気ヘツドに適用しても同様の効果を奏
せしめ得ることは明らかであろう。 As described above, according to the magnetic head according to the present invention, it is possible to obtain a magnetic head with high recording efficiency even though the coil 4 is placed back from the sliding surface with the magnetic medium. It is clear that the magnetic head according to the present invention can produce similar effects even when applied to a multi-element magnetic head in which a plurality of main magnetic poles 2 are arranged.
第１図、第２図、及び第４図は垂直記録型磁気
ヘツドの構成図、第３図は磁化状態の説明図第５
図及び第６図は夫々本発明による磁気ヘツドの各
例の構成図、第７図ないし第９図は夫々その寸法
選定の説明図、第１０図は本発明による磁気ヘツ
ドの他の例の構成図、第１１図ないし第１７図は
本発明による磁気ヘツドの一例の一製法の工程図
である。
Ｈは磁気ヘツド、２はその主磁極、４はコイ
ル、１０は補助コア、１７は補強体である。
1, 2, and 4 are configuration diagrams of a perpendicular recording type magnetic head, and FIG. 3 is an explanatory diagram of the magnetization state.
6 and 6 are configuration diagrams of each example of the magnetic head according to the present invention, FIGS. 7 to 9 are explanatory diagrams of dimension selection, respectively, and FIG. 10 is a configuration of another example of the magnetic head according to the present invention. 11 to 17 are process diagrams of a manufacturing method of an example of a magnetic head according to the present invention. H is a magnetic head, 2 is its main pole, 4 is a coil, 10 is an auxiliary core, and 17 is a reinforcing body.
Claims (1)
とも一側面に配置される補助コアと、該補助コア
上に巻装されるコイルとを具備し、上記主磁極
の、磁気媒体との摺動面に臨む先端と上記補助コ
アの先端との間の距離をｌとし、上記主磁極の上
記補助コアが設けられた側面から、これに対向す
る上記コイルの巻回内面までの距離をａとし、上
記コイルの巻回厚をｂとするとき、（ａ＋ｂ／２）／ ｌが0.55〜2.4に選定されて成る磁気ヘツド。[Claims] 1. A main magnetic pole made of a magnetic thin film, an auxiliary core disposed on at least one side of the main magnetic pole, and a coil wound on the auxiliary core, , the distance between the tip facing the sliding surface with the magnetic medium and the tip of the auxiliary core is l, and from the side surface of the main pole where the auxiliary core is provided, the inner surface of the winding of the coil facing the side surface where the auxiliary core is provided. A magnetic head in which (a+b/2)/l is selected from 0.55 to 2.4, where a is the distance to the coil and b is the winding thickness of the coil.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4674681A JPS57162114A (en) | 1981-03-30 | 1981-03-30 | Magnetic head |
| CA000399018A CA1179771A (en) | 1981-03-30 | 1982-03-22 | Perpendicular mode magnetic transducer head |
| NL8201231A NL8201231A (en) | 1981-03-30 | 1982-03-24 | MAGNETIC HEAD. |
| DE19823211581 DE3211581A1 (en) | 1981-03-30 | 1982-03-29 | MAGNETIC HEAD FOR SIGNAL RECORDING ON A MEDIUM |
| FR8205338A FR2502824B1 (en) | 1981-03-30 | 1982-03-29 | MAGNETIC TRANSDUCER HEAD |
| GB8209188A GB2095888B (en) | 1981-03-30 | 1982-03-29 | Magnetic transducer heads |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4674681A JPS57162114A (en) | 1981-03-30 | 1981-03-30 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57162114A JPS57162114A (en) | 1982-10-05 |
| JPH0157405B2 true JPH0157405B2 (en) | 1989-12-05 |
Family
ID=12755893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4674681A Granted JPS57162114A (en) | 1981-03-30 | 1981-03-30 | Magnetic head |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS57162114A (en) |
| CA (1) | CA1179771A (en) |
| DE (1) | DE3211581A1 (en) |
| FR (1) | FR2502824B1 (en) |
| GB (1) | GB2095888B (en) |
| NL (1) | NL8201231A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59157819A (en) * | 1983-02-25 | 1984-09-07 | Sony Corp | Vertical magnetic recording head |
| WO1984003788A1 (en) * | 1983-03-22 | 1984-09-27 | Sony Corp | Single magnetic pole type of composite magnetic head for perpendicular recording |
| JPH07101483B2 (en) * | 1983-08-29 | 1995-11-01 | ソニー株式会社 | Thin film magnetic head |
| US4672494A (en) * | 1983-09-01 | 1987-06-09 | Matsushita Electric Industrial Co., Ltd. | Magnetic head for effecting perpendicular magnetic recording |
| JPS60197914A (en) * | 1984-03-20 | 1985-10-07 | Olympus Optical Co Ltd | Vertical magnetization type magnetic head |
| JPS6134710A (en) * | 1984-07-26 | 1986-02-19 | Akai Electric Co Ltd | Magnetic head |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5810764B2 (en) * | 1977-09-30 | 1983-02-28 | 岩崎 俊一 | magnetic recording and reproducing device |
| JPS5584015U (en) * | 1978-12-07 | 1980-06-10 | ||
| JPS56165918A (en) * | 1980-05-23 | 1981-12-19 | Ricoh Co Ltd | Vertical magnetic recorder and reproducer |
-
1981
- 1981-03-30 JP JP4674681A patent/JPS57162114A/en active Granted
-
1982
- 1982-03-22 CA CA000399018A patent/CA1179771A/en not_active Expired
- 1982-03-24 NL NL8201231A patent/NL8201231A/en not_active Application Discontinuation
- 1982-03-29 DE DE19823211581 patent/DE3211581A1/en not_active Ceased
- 1982-03-29 GB GB8209188A patent/GB2095888B/en not_active Expired
- 1982-03-29 FR FR8205338A patent/FR2502824B1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57162114A (en) | 1982-10-05 |
| DE3211581A1 (en) | 1982-12-02 |
| NL8201231A (en) | 1982-10-18 |
| GB2095888A (en) | 1982-10-06 |
| FR2502824A1 (en) | 1982-10-01 |
| GB2095888B (en) | 1984-09-26 |
| FR2502824B1 (en) | 1985-01-04 |
| CA1179771A (en) | 1984-12-18 |
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