JPH0327963B2 - - Google Patents
Info
- Publication number
- JPH0327963B2 JPH0327963B2 JP56095850A JP9585081A JPH0327963B2 JP H0327963 B2 JPH0327963 B2 JP H0327963B2 JP 56095850 A JP56095850 A JP 56095850A JP 9585081 A JP9585081 A JP 9585081A JP H0327963 B2 JPH0327963 B2 JP H0327963B2
- Authority
- JP
- Japan
- Prior art keywords
- head
- core
- magnetic
- flux density
- recording
- 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 - Lifetime
Links
- 230000005291 magnetic effect Effects 0.000 claims description 77
- 230000004907 flux Effects 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 10
- 239000011162 core material Substances 0.000 description 32
- 230000005294 ferromagnetic effect Effects 0.000 description 16
- 239000010409 thin film Substances 0.000 description 16
- 230000005284 excitation Effects 0.000 description 13
- 239000010408 film Substances 0.000 description 13
- 230000005415 magnetization Effects 0.000 description 9
- 238000000034 method Methods 0.000 description 6
- 229910000859 α-Fe Inorganic materials 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 229910000702 sendust Inorganic materials 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 230000003014 reinforcing effect Effects 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
- 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
Description
【発明の詳細な説明】
本発明は磁気ヘツドに関するものであり、特に
垂直磁気記録方式に適し、かつ実用性のある記録
再生用磁気ヘツドを提供するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, and particularly provides a magnetic head for recording and reproducing that is suitable for perpendicular magnetic recording and is practical.
短波長記録特性の優れた磁気記録方式として、
垂直記録方式があり、この方式を用いた磁気ヘツ
ドは第１図に示す様な基本構成から成つている。
磁気記録媒体１は非磁性基板２の上に膜面内に磁
化容易軸を有するパーマロイ等の強磁性薄膜３を
介して膜面に垂直方向に磁化容易軸を有する垂直
磁化膜４が形成されたものである。一方磁気ヘツ
ドは主磁極５及び補助磁極６から成り磁気記録媒
体１をはさむ構造になつている（以下このヘツド
を補助磁極励磁型垂直ヘツドと呼ぶ。）補助磁極
６は磁気記録媒体１の非磁性基板２側に面してお
り、強磁性体コア７は励磁巻線８が巻かれてい
る。また主磁極５は垂直磁化膜４に接している。 As a magnetic recording method with excellent short wavelength recording characteristics,
There is a perpendicular recording method, and a magnetic head using this method has a basic configuration as shown in FIG.
In the magnetic recording medium 1, a perpendicular magnetization film 4 having an easy axis of magnetization perpendicular to the film surface is formed on a non-magnetic substrate 2 via a ferromagnetic thin film 3 such as permalloy having an easy axis of magnetization in the film surface. It is something. On the other hand, the magnetic head consists of a main magnetic pole 5 and an auxiliary magnetic pole 6, and is structured to sandwich the magnetic recording medium 1 (hereinafter, this head will be referred to as an auxiliary magnetic pole excitation type vertical head). The ferromagnetic core 7 faces the substrate 2 side, and an excitation winding 8 is wound around the ferromagnetic core 7 . Further, the main magnetic pole 5 is in contact with the perpendicularly magnetized film 4 .
信号を記録する際は、励磁巻線８に流れる信号
電流により強磁性体コア７を磁化し、この強磁性
体コア７の発生する磁界により主磁極５を磁化す
る。垂直磁化膜４への記録は主磁極５の発生する
磁界によつて行なわれる。信号を再生する際には
記録時と逆の過程で行なわれる。 When recording a signal, the ferromagnetic core 7 is magnetized by the signal current flowing through the excitation winding 8, and the main magnetic pole 5 is magnetized by the magnetic field generated by the ferromagnetic core 7. Recording on the perpendicularly magnetized film 4 is performed by the magnetic field generated by the main magnetic pole 5. When reproducing a signal, the process is the reverse of the recording process.
上記のような従来の構成の補助磁極励磁型垂直
ヘツドによれば、主磁極先端から垂直磁化膜を磁
化するために最適の磁界が生じ、優れた記録特性
が得られる。また磁気記録媒体は膜面内に磁化容
易軸のある強磁性薄膜３を有しているためにこの
ヘツドによつて再生も可能である。 According to the auxiliary pole-excited vertical head having the above-described conventional structure, an optimum magnetic field is generated from the tip of the main pole to magnetize the perpendicular magnetization film, and excellent recording characteristics can be obtained. Furthermore, since the magnetic recording medium has a ferromagnetic thin film 3 with an axis of easy magnetization in the film plane, reproduction is also possible with this head.
しかし前記従来の補助磁極励磁型垂直ヘツドは
媒体をはさむ構造をしているために、実用性が悪
い。例えば回転ヘツド方式のVTRにこの様なヘ
ツドを応用することは困難である。また、このヘ
ツドは開磁路構造をしているために、現在一般に
用いられているリング形ヘツドに比べ再生効率が
劣つている。 However, the conventional auxiliary magnetic pole excitation type vertical head has a structure in which the medium is sandwiched, and therefore is not practical. For example, it is difficult to apply such a head to a rotating head type VTR. Furthermore, since this head has an open magnetic path structure, its regeneration efficiency is inferior to that of the ring-shaped head commonly used at present.
このような補助磁極励磁型垂直ヘツドの欠点を
除去するために、媒体をはさまない第２図の様な
構成のヘツドが考えられている。このヘツドは従
来のリング形ヘツドの一方のコアを強磁性薄膜９
に変えたものであり、従来のリング形ヘツドに対
し強磁性薄膜近傍における発生磁界の垂直成分が
急俊になつており、垂直磁化膜に対し、第１図に
示し補助磁極励磁型垂直ヘツドと同程度の記録特
性が得られる（ただし記録媒体走行方行をコア１
０が記録媒体入側のコアになる様にした場合に、
この様な特性が得られ、走行方向を逆にすると従
来のリング形ヘツドと同程度の記録特性になる）。
１１は非磁性体より成るギヤツプ材料である。 In order to eliminate these drawbacks of the auxiliary magnetic pole excitation type vertical head, a head having a structure as shown in FIG. 2, which does not sandwich a medium, has been considered. This head has one core of a conventional ring-shaped head with a ferromagnetic thin film 9
The vertical component of the generated magnetic field near the ferromagnetic thin film has become sharper compared to the conventional ring-shaped head. The same level of recording characteristics can be obtained (however, the recording medium running direction is
If 0 is set as the core on the recording medium input side,
Such characteristics are obtained, and if the running direction is reversed, the recording characteristics are comparable to those of a conventional ring head).
11 is a gap material made of non-magnetic material.
また第２図のヘツドは閉磁路構造を有している
ために、補助磁極励磁型垂直ヘツドに比べ再生効
率が優れている。しかし従来のリング形ヘツドに
比べると、２図のヘツドは一方のコアが薄膜であ
るために、リラクタンス（磁気抵抗）が大きくな
り再生効率が劣る。すなわち、第３図に示す従来
のリング形ヘツドの場合には再生時に記録媒体か
ら生ずる磁束は、同図の破線１３に示す様に殆ど
がヘツドコア１４の内部を通るのに対し、第２図
のヘツトでは第４図に示す様にコアの内部を通ら
ずにギヤツプ材料１１内を通つてしまうものが多
くなる。 Furthermore, since the head shown in FIG. 2 has a closed magnetic circuit structure, it has better reproduction efficiency than the auxiliary magnetic pole excitation type vertical head. However, compared to the conventional ring-shaped head, since one of the cores of the head shown in FIG. 2 is made of a thin film, the reluctance (magnetic resistance) is large and the reproduction efficiency is inferior. That is, in the case of the conventional ring-shaped head shown in FIG. 3, most of the magnetic flux generated from the recording medium during reproduction passes through the inside of the head core 14, as shown by the broken line 13 in the same figure, whereas the magnetic flux in FIG. At the top, as shown in FIG. 4, many particles pass through the gap material 11 without passing through the core.
その結果、第２図のヘツドは従来のリング形ヘ
ツトに比べ再生効率が劣化する。なお、第３図，
第４図にいて矢印１２は垂直磁化膜４に記録され
た残留磁化の向きを示す。 As a result, the head of FIG. 2 has a lower regeneration efficiency than the conventional ring-shaped head. In addition, Fig. 3,
In FIG. 4, an arrow 12 indicates the direction of residual magnetization recorded in the perpendicularly magnetized film 4.
本発明は上記の欠点を除去するものであり記録
媒体をはさむことなく、記録特性が優れ、かつ従
来のリング形ヘツドと同程度の再生特性を有する
垂直記録再生用ヘツドを提供するものである。 The present invention eliminates the above-mentioned drawbacks and provides a perpendicular recording/reproducing head which does not sandwich a recording medium, has excellent recording characteristics, and has reproduction characteristics comparable to those of conventional ring-shaped heads.
本発明の一実施例における磁気ヘツドの構成を
第５図に示す。なお、第５図において従来例を示
す第第１図，第２図と同様の箇所には同一番号を
付している。本実施例のヘツドの基本構成は従来
のリング形ヘツドと同様に１対のコア１０及び１
５から成つている。ただし、コア１５の飽和磁束
密度Bs1はコア１０の飽和磁束密度Bs2よりも小さ
く、かつコア１５とギヤツプ材料１１との間に強
磁性薄膜９が形成されており、この薄膜の飽和磁
束密度Bs3は前記Bs1よりも大きい。また垂直記録
媒体１は図示矢印Ａの方向に走行させ、コア１５
が記録体出側のコアになる様にする。 FIG. 5 shows the configuration of a magnetic head in one embodiment of the present invention. In FIG. 5, the same numbers are given to the same parts as in FIGS. 1 and 2 showing the conventional example. The basic structure of the head of this embodiment is the same as the conventional ring head, which includes a pair of cores 10 and 1.
It consists of 5. However, the saturation magnetic flux density B s1 of the core 15 is smaller than the saturation magnetic flux density B s2 of the core 10, and the ferromagnetic thin film 9 is formed between the core 15 and the gap material 11, and the saturation magnetic flux density of this thin film is B s3 is larger than the above B s1 . Further, the perpendicular recording medium 1 is run in the direction of arrow A in the figure, and the core 15
so that it becomes the core on the recording body exit side.
次に第５図に示す構造を有する本実施例の磁気
ヘツドの記録及び再生時の動作について説明す
る。 Next, the recording and reproducing operations of the magnetic head of this embodiment having the structure shown in FIG. 5 will be explained.
まず記録時の動作を説明する。本実施例のヘツ
ドはコア１５の飽和磁束密度Bs1をコア１０の飽
和磁束密度Bs2及び強磁性薄膜９の飽和磁束密度
Bs3よりも小さく設定しているために、コア１０
及び強磁性薄膜９よりも先にコア１５が磁気飽和
を生じ、記録時には第２図のヘツドに近い動作を
する。すなわちコア１５が飽和する様な領域で本
実施例のヘツドを使すると、第２図のヘツドと同
様の急俊な垂直成分を有する磁界を強磁性薄膜９
の近傍に発生し、垂直磁化膜に対し補助磁極励磁
型垂直ヘツドと同程度の記録特性が得られる。 First, the operation during recording will be explained. In the head of this embodiment, the saturation magnetic flux density B s1 of the core 15 is converted into the saturation magnetic flux density B s2 of the core 10 and the saturation magnetic flux density B s2 of the ferromagnetic thin film 9.
B Since it is set smaller than s3 , core 10
The core 15 becomes magnetically saturated before the ferromagnetic thin film 9, and operates similar to the head shown in FIG. 2 during recording. That is, when the head of this embodiment is used in a region where the core 15 is saturated, a magnetic field having a steep vertical component similar to the head of FIG. 2 is applied to the ferromagnetic thin film 9.
This occurs in the vicinity of , and it is possible to obtain recording characteristics comparable to those of an auxiliary pole excitation type perpendicular head for a perpendicularly magnetized film.
次に再生時の動作について説明する。再生時の
ヘツドの特性は一般に飽和磁束密度には依存せ
ず、透磁率μに依存する。従つて本実施例のヘツ
ドにおいてコア１５として、飽和磁束密度が小さ
くても透磁率μの大きな材料を使用すれば、再生
時には従来のリング形ヘツドと同様の再生特性が
得られる。すなわち、第５図に示す本実施例のヘ
ツドにおいては再生時には媒体の発生する磁束は
第３図の様に殆どが、ギヤツプ部を通らずにコア
を通るために再生効率が良い。 Next, the operation during playback will be explained. The characteristics of the head during reproduction generally do not depend on the saturation magnetic flux density but on the magnetic permeability μ. Therefore, if a material having a low saturation magnetic flux density but a large magnetic permeability .mu. is used for the core 15 in the head of this embodiment, the same reproducing characteristics as the conventional ring-shaped head can be obtained during reproducing. That is, in the head of this embodiment shown in FIG. 5, during reproduction, most of the magnetic flux generated by the medium passes through the core rather than through the gap portion, as shown in FIG. 3, so that the reproduction efficiency is good.
以上をまとめると、本実施例のヘツドは記録時
には補助磁極励磁型垂直ヘツドあるいは第２図の
ヘツドと同程度の性能を有し、再生時には従来の
リング形ヘツドと同程度の性能を有する。かつ記
録媒体をはさむ必要がないために実用性がある。 In summary, the head of this embodiment has a performance comparable to that of the auxiliary magnetic pole excitation type vertical head or the head shown in FIG. 2 during recording, and a performance comparable to that of a conventional ring head during reproduction. Moreover, it is practical because there is no need to sandwich the recording medium.
次に本実施例のヘツド、従来のリング形ヘツ
ド、補助磁極励磁型垂直ヘツド及び第２図のヘツ
ドにより第１図に示す様な垂直記録媒体１に信号
を記録し再生した場合の周波数特性を第６図に示
す。ただし本実施例のヘツドのコア１０の材料は
飽和磁束密度が5000ガウスのMn−Znフエライ
ト，コア１５の材料は飽和磁束密度2500ガウスの
Ni−Znフエライト、薄膜９は飽和磁束密度が
10000ガウス、膜厚が1μmのセンダストであり、
ギヤツプ長は0.3μmである。 Next, we will examine the frequency characteristics when signals are recorded and reproduced on the perpendicular recording medium 1 as shown in FIG. 1 using the head of this embodiment, the conventional ring type head, the auxiliary magnetic pole excitation type vertical head, and the head shown in FIG. It is shown in FIG. However, the material of the core 10 of the head in this example is Mn-Zn ferrite with a saturation magnetic flux density of 5000 Gauss, and the material of the core 15 is a saturation magnetic flux density of 2500 Gauss.
Ni-Zn ferrite, thin film 9 has a saturation magnetic flux density of
10000 Gauss, 1 μm thick Sendust,
The gap length is 0.3 μm.
一方、従来のリング形ヘツドのコア材料はMn
−Znフエライトであり、ギヤツプ長は0.3μmであ
る。補助磁極励磁型垂直ヘツドの主磁極は0.3μm
厚のセンダスト、補強磁極は２mm厚のMn−Znフ
エライトである。第２図のヘツドのコア１０の材
料はMn−Znフエライト、薄膜９は膜厚が1μmの
センダストであり、ギヤツプ長は0.3μmである。
また垂直記録媒体１における強磁性薄膜３の飽和
磁化は600ガウス、膜厚は0.2μmとし、垂直磁化
膜４の飽和磁化は300ガウス、保磁力は600Oe、
膜厚は0.2μmとした。 On the other hand, the core material of the conventional ring head is Mn.
-Zn ferrite with a gap length of 0.3 μm. The main magnetic pole of the auxiliary magnetic pole excitation type vertical head is 0.3μm.
The thick sendust and reinforcing magnetic poles are 2mm thick Mn-Zn ferrite. The material of the core 10 of the head in FIG. 2 is Mn--Zn ferrite, the thin film 9 is sendust with a thickness of 1 μm, and the gap length is 0.3 μm.
In addition, the saturation magnetization of the ferromagnetic thin film 3 in the perpendicular recording medium 1 is 600 Gauss, the film thickness is 0.2 μm, the saturation magnetization of the perpendicular magnetization film 4 is 300 Gauss, the coercive force is 600 Oe,
The film thickness was 0.2 μm.
第６図の曲線１６，１７，１８及び１９はそれ
ぞれ本実施例のヘツド、従来のリング形ヘツド、
補助磁極励磁型垂直ヘツド及び第２図のヘツドで
垂直記録体に記録再生した場合の周波数特性を示
す。本実施例のヘツドはリング形ヘツドに対し約
7.5dB、第２図のヘツドに対し約3.5dB、補助磁
極励磁型垂直ヘツドに対し約5dB出力が高くなつ
ている。 Curves 16, 17, 18 and 19 in FIG. 6 represent the head of this embodiment, the conventional ring-shaped head, and
The frequency characteristics when recording and reproducing data on a perpendicular recording medium using the auxiliary magnetic pole excitation type vertical head and the head shown in FIG. 2 are shown. The head in this example is approximately
The output is 7.5 dB, approximately 3.5 dB higher than the head shown in Figure 2, and approximately 5 dB higher than the auxiliary magnetic pole excitation type vertical head.
なお以上の実施例では第５図に示す様にコア１
５全体の飽和磁束密度をコア１０の飽和磁束密度
よりも小さくしいるが、第７図の本発明の他の実
施例に示す如く、コア１５のかわりに記録媒体摺
動面近傍部２１の飽和磁束密度を記録媒体入側の
コア１０の飽和磁束密度よりも小なる様にし、近
傍部２１以外の部分２０の飽和磁束密度はコア１
０と同じ値を有するコアを用いても第５図のヘツ
ドと同様の記録再生特性を示す。 In the above embodiment, as shown in FIG.
The saturation magnetic flux density of the whole 5 is made smaller than the saturation magnetic flux density of the core 10, but as shown in another embodiment of the present invention in FIG. The magnetic flux density is set to be smaller than the saturation magnetic flux density of the core 10 on the recording medium entrance side, and the saturation magnetic flux density of the portion 20 other than the vicinity portion 21 is set to be smaller than the saturation magnetic flux density of the core 10 on the recording medium entrance side.
Even if a core having the same value as 0 is used, the same recording/reproducing characteristics as the head shown in FIG. 5 are obtained.
以上では、垂直記録媒体として、垂直磁化膜４
と非磁性基板２との間に強磁性薄膜３が形成され
ている媒体の例について具体的に説明したがが、
強磁性薄膜３のない垂直記録媒体の場合について
も同様の効果が得られる。 In the above description, the perpendicular magnetic film 4 is used as a perpendicular recording medium.
Although we specifically explained an example of a medium in which a ferromagnetic thin film 3 is formed between a non-magnetic substrate 2 and
Similar effects can be obtained in the case of a perpendicular recording medium without the ferromagnetic thin film 3.
以上の実施例で説明したように、本発明の磁気
ヘツドは垂直記録媒体をはさむ必要がないために
実用性にすぐれ、さらに垂直記録媒体に対し優れ
た記録再生特性を有しているもので、工業上の利
用価値が高い。 As explained in the above embodiments, the magnetic head of the present invention has excellent practicality because it does not require a perpendicular recording medium to be sandwiched between the heads, and also has excellent recording and reproducing characteristics for perpendicular recording media. High industrial value.
第１図は垂直記録方式を用いた従来の磁気ヘツ
ドの構成を示す図、第２図は従来の他の実施例に
おける磁気ヘツドの構造を示す図、第３図は従来
のリング形ヘツドにおいて再生時に内部を通る磁
束の状態を示す図、第４図は第２図の磁気ヘツド
において再生時に内部を通る磁束の状態を示す
図、第５図は本発明の一実施例における磁気ヘツ
ドの構成を示す図、第６図は本発明の実施例にお
ける磁気ヘツドおよび従来の磁気ヘツドの記録再
生周波数特性を示す図、第７図は本発明の他の実
施例における磁気ヘツドの構成を示す図である。
１……磁気記録媒体、８……励磁巻線、９……
強磁性薄膜、１０……コア、１１……ギヤツプ材
料、１５……コア、２０……記録媒体摺動面近傍
部２１以外の部分、２１……記録媒体摺動面近傍
部。
Figure 1 shows the structure of a conventional magnetic head using the perpendicular recording method, Figure 2 shows the structure of another conventional magnetic head, and Figure 3 shows reproduction in a conventional ring head. FIG. 4 is a diagram showing the state of magnetic flux passing inside the magnetic head of FIG. 2 during reproduction, and FIG. 5 is a diagram showing the configuration of the magnetic head in an embodiment of the present invention. 6 is a diagram showing the recording and reproducing frequency characteristics of a magnetic head in an embodiment of the present invention and a conventional magnetic head, and FIG. 7 is a diagram showing the configuration of a magnetic head in another embodiment of the present invention. . 1... Magnetic recording medium, 8... Excitation winding, 9...
Ferromagnetic thin film, 10...core, 11...gap material, 15...core, 20...portion other than portion 21 near recording medium sliding surface, 21... portion near recording medium sliding surface.
Claims (1)
密度がBs1の第１のコアと、前記第１のコアに対
して前記記録媒体の進行方向と反対側に設けら
れ、前記第１のコアと組み合わせられて間隙を形
成する飽和磁束密度がBs2の第２のコアと、前記
間隙に形成されたギヤツプ材料と、前記第１のコ
アと前記ギヤツプ材料との間に設けられた飽和磁
束密度がBs3の磁性膜とを有する磁気ヘツドであ
つて、前記飽和磁束密度の大きさが、Bs1＜Bs2，
Bs3の関係を満たすことを特徴とする磁気ヘツド。1. A first core having a saturation magnetic flux density of B s1 at least in the vicinity of the recording medium sliding surface, and a first core provided on the opposite side of the traveling direction of the recording medium with respect to the first core; a second core having a saturation magnetic flux density B s2 combined to form a gap; a gap material formed in the gap; and a saturation magnetic flux density provided between the first core and the gap material. A magnetic head having a magnetic film of B s3 , wherein the magnitude of the saturation magnetic flux density satisfies B s1 <B s2 ,
A magnetic head characterized by satisfying the relationship B s3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9585081A JPS57210415A (en) | 1981-06-19 | 1981-06-19 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9585081A JPS57210415A (en) | 1981-06-19 | 1981-06-19 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57210415A JPS57210415A (en) | 1982-12-24 |
| JPH0327963B2 true JPH0327963B2 (en) | 1991-04-17 |
Family
ID=14148842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9585081A Granted JPS57210415A (en) | 1981-06-19 | 1981-06-19 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57210415A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5996517A (en) * | 1982-11-22 | 1984-06-04 | Seiko Epson Corp | Magnetic recording and reproducing method |
| JPS59178610A (en) * | 1983-03-29 | 1984-10-09 | Fujitsu Ltd | Thin film head for vertical magnetic recording |
| JPH0658724B2 (en) * | 1985-01-09 | 1994-08-03 | 松下電器産業株式会社 | Magnetic head |
| ATE100962T1 (en) * | 1987-10-30 | 1994-02-15 | Seagate Technology | MAGNETIC HEAD FOR VERTICAL MAGNETIC RECORDING SYSTEM AND METHOD OF MANUFACTURE. |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53116809A (en) * | 1977-03-22 | 1978-10-12 | Hitachi Ltd | Magnetic head core |
| JPS5740722A (en) * | 1980-08-25 | 1982-03-06 | Matsushita Electric Ind Co Ltd | Vertical magnetic recording head |
-
1981
- 1981-06-19 JP JP9585081A patent/JPS57210415A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS53116809A (en) * | 1977-03-22 | 1978-10-12 | Hitachi Ltd | Magnetic head core |
| JPS5740722A (en) * | 1980-08-25 | 1982-03-06 | Matsushita Electric Ind Co Ltd | Vertical magnetic recording head |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57210415A (en) | 1982-12-24 |
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