JPS6085408A - Vertical magnetic head - Google Patents
Vertical magnetic headInfo
- Publication number
- JPS6085408A JPS6085408A JP19363183A JP19363183A JPS6085408A JP S6085408 A JPS6085408 A JP S6085408A JP 19363183 A JP19363183 A JP 19363183A JP 19363183 A JP19363183 A JP 19363183A JP S6085408 A JPS6085408 A JP S6085408A
- Authority
- JP
- Japan
- Prior art keywords
- signals
- magnetic pole
- recording
- auxiliary
- recording 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
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
Landscapes
- Magnetic Heads (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野〕
この発明は垂直磁気記録方式に用いられる垂直磁気ヘッ
ドに関し、特に高密度記録・再生においても十分な再生
感度の確保を図るためのヘッド構造の改良に関する。[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a perpendicular magnetic head used in a perpendicular magnetic recording system, and in particular to a head structure designed to ensure sufficient reproduction sensitivity even in high-density recording and reproduction. Regarding improvements.
(従来技術〕
垂直磁気記録方式は、これまでの磁気記録方式とは比較
にならないほどの高密度記録を可能にする磁気記録方式
として近年活発に研究開発が進められている。(Prior Art) Perpendicular magnetic recording has been actively researched and developed in recent years as a magnetic recording method that enables high-density recording incomparably with conventional magnetic recording methods.
ところで、この垂直磁気記録方式はテープやディスクと
いった記録媒体の「厚さ方向」に磁気記録を行おうとす
る方式であることから、この記録媒体は勿論のこと、こ
の記録・再生用のヘッドすなわち垂直磁気ヘッドとして
もおのずと従来の磁気ヘッドとは異なった特性をもつも
のが必要とされる。すなわち垂直磁気ヘッドにおいては
、a)記録媒体が磁気的に垂直異方性を有することから
、分布が鋭く、かつ大きな重置方向磁界を発生してこれ
を十分に磁化し得ること。およびb)小さな起磁力で記
録媒体への記録を可能とし、この記録した記録媒体から
大きな再生出力を取り出し得ること。By the way, this perpendicular magnetic recording method is a method that attempts to perform magnetic recording in the "thickness direction" of a recording medium such as a tape or disk, so it goes without saying that this recording medium as well as the recording/reproducing head, that is, the perpendicular Naturally, a magnetic head is required that has characteristics different from those of conventional magnetic heads. That is, in a perpendicular magnetic head, a) since the recording medium has perpendicular anisotropy magnetically, it is possible to generate a magnetic field with a sharp distribution and a large overlap direction to sufficiently magnetize the magnetic field. and b) It is possible to record on a recording medium with a small magnetomotive force and to extract a large playback output from the recorded recording medium.
が主に要求される。このような要求を満たすものとして
補助磁極励磁型磁気ヘッドが提案されていることは周知
の通りである。この補助磁極励磁型磁気ヘッドの構成を
第1図に示す。is mainly required. It is well known that an auxiliary pole excitation type magnetic head has been proposed to meet these requirements. The structure of this auxiliary pole excitation type magnetic head is shown in FIG.
すなわちこの種の磁気ヘッドは同第1図に示すように、
ニッケル(Ni )−鉄(Fe)合金薄膜等の高透磁率
磁性体薄膜からなりその先端が記録媒体RMの磁性層に
摺接するよう配される主磁極1、この主磁極1を保持す
る非磁性体ホルダ2aおよび2b、上記主磁極1に比べ
て十分な厚さを有するフェライト等の高透磁率磁性体材
料からなり記録媒体RMを介して上記主磁極1の先端部
と対向するよう配される補助磁極3、この補助磁極3の
先端部近傍に巻装された信号記録・再生用コイルとして
の励磁コイル4をそれぞれ有して構成され、上記励磁コ
イル4に適宜な電流を流して補助磁極3を励磁すること
により生じる主磁極1の強い垂直磁界で記録媒体RMの
磁性層に信号を記録し、また記録媒体RMの磁性層から
の磁界により生じる主磁極1の磁束を補助磁極3に誘導
して信号を再生するよう動作する。In other words, this type of magnetic head, as shown in FIG.
A main magnetic pole 1 made of a high magnetic permeability magnetic thin film such as a nickel (Ni)-iron (Fe) alloy thin film and arranged so that its tip is in sliding contact with the magnetic layer of the recording medium RM, and a non-magnetic magnetic pole that holds this main magnetic pole 1. The body holders 2a and 2b are made of a high magnetic permeability magnetic material such as ferrite and have a sufficient thickness compared to the main magnetic pole 1, and are arranged to face the tip of the main magnetic pole 1 via the recording medium RM. The structure includes an auxiliary magnetic pole 3 and an excitation coil 4 as a signal recording/reproducing coil wound around the tip of the auxiliary magnetic pole 3. By passing an appropriate current through the excitation coil 4, the auxiliary magnetic pole 3 A signal is recorded in the magnetic layer of the recording medium RM by a strong perpendicular magnetic field of the main magnetic pole 1 generated by excitation of the main magnetic pole 1, and the magnetic flux of the main magnetic pole 1 generated by the magnetic field from the magnetic layer of the recording medium RM is induced to the auxiliary magnetic pole 3. It operates to regenerate the signal.
ただし、このような補助磁極励磁型の垂直磁気ヘッドζ
こおいては、本質的に磁束開放型であることから、特に
高密度で上記信号の記録を行った場合には、この再生時
に磁界ループが大きくなって多大なエネルギー損失を生
じること、および記録媒体RM上の磁界の変化を主磁極
1を介して間接的に補助磁極3に誘導して再生信号とす
ることなどを原因として再生出力が低下したり、あるい
は主磁極1の厚みが記録波長の偶数倍lこ一致したとき
その再生出力が急に降下するいわゆるディップ現像が生
じたりするものであり、いまだ再生系に多々問題を残す
。However, such an auxiliary pole excitation type perpendicular magnetic head ζ
Since this is essentially a magnetic flux open type, when the above-mentioned signal is recorded at a particularly high density, the magnetic field loop becomes large during reproduction, causing a large energy loss, and the recording The reproduction output may decrease due to changes in the magnetic field on the medium RM being indirectly induced to the auxiliary magnetic pole 3 via the main magnetic pole 1 and used as a reproduction signal, or the thickness of the main magnetic pole 1 may be lower than the recording wavelength. So-called dip development, in which the reproduction output suddenly drops when an even number of times L is matched, occurs, and many problems still remain in the reproduction system.
この発明は上記実情に鑑みてなされたもので、高密度な
垂直磁気記録・再生においても十分な再(3)
生感度を確保することができ、かつ構造的にも簡単で実
用性に富む垂直磁気ヘッドを提供することを目的とする
。This invention was made in view of the above-mentioned circumstances, and is a vertical magnetic head that is simple in structure and highly practical, which can ensure sufficient reproducibility even in high-density perpendicular magnetic recording and reproduction. The purpose is to provide a magnetic head.
すなわちこの発明では、磁気抵抗効果を利用して記録媒
体上の磁界変化を抽出する磁気抵抗効果素子ヘッド(M
Rヘッド)を垂直磁気再生ヘッドとして用いれば、高密
度記録が行われた場合であってもS/N比の高い大きな
再生出力を取り出すことができ、かつ前述した補助磁極
励磁型垂直磁気ヘッドの再生系において発生したような
種々不都合も回避されることに着目して、記録媒体への
信号記録時には前記励磁コイル、および高透磁率磁性体
からなる補助磁極、主磁極を用いて信号の書込みを行い
、また記録媒体からの信号再生時には上記磁気抵抗効果
素子を用いて記録信号の読出しを行うようにし、さらに
構造の簡単化、再生出力の増大化、および高密度記録時
における高再生出力の維持等を考慮して、上記磁気抵抗
効果素子を補助磁極の側に配置し、好ましくは同補助磁
極(4)
と一体形成するようにする。That is, in this invention, a magnetoresistive element head (M
R head) as a perpendicular magnetic reproducing head, it is possible to obtain a large reproducing output with a high S/N ratio even in the case of high-density recording, and it is possible to obtain a large reproducing output with a high S/N ratio. Focusing on avoiding various inconveniences that occur in the reproduction system, when recording signals on a recording medium, the excitation coil and an auxiliary magnetic pole and a main magnetic pole made of a high permeability magnetic material are used to write signals. In addition, when reproducing signals from a recording medium, the above-mentioned magnetoresistive element is used to read the recorded signal, and furthermore, the structure is simplified, the reproduction output is increased, and the high reproduction output is maintained during high-density recording. In consideration of the above, the magnetoresistive element is arranged on the side of the auxiliary magnetic pole, and preferably formed integrally with the auxiliary magnetic pole (4).
したがってこの発明にかかる垂直磁気ヘッドによれば、
ヘッド自体の構造は勿論のこと、同ヘッドを搭載する装
置も上記磁気抵抗効果素子に定電流を印加するための手
段を追加するだけの簡単な構成で、記録媒体への高効率
かつ高密度な信号記録、および記録媒体からの高感度な
信号再生を行うことができる。Therefore, according to the perpendicular magnetic head according to the present invention,
Not only the structure of the head itself, but also the device equipped with the head has a simple configuration that requires only the addition of a means for applying a constant current to the magnetoresistive element, allowing for highly efficient and high-density recording of the recording medium. Signal recording and highly sensitive signal reproduction from recording media can be performed.
はじめ−こ、第2図を参照して、この発明の垂直磁気ヘ
ッドに用いる磁気抵抗効果素子の信号再生原理を簡単に
説明する。First, the signal reproduction principle of the magnetoresistive element used in the perpendicular magnetic head of the present invention will be briefly explained with reference to FIG.
第2図において、5が上記磁気抵抗効果素子、6がこの
磁気抵抗効果素子50両端電極を通じて定電流を供給す
る定電流源であり、このような状態におかれた磁気抵抗
効果素子5は、何らかの磁界が作用すること暑こよって
その電気抵抗値が変化する。すなわち、この定電KIが
印加されている磁気抵抗効果索子5を同第2図に示すよ
うに、再生時主磁極(図示を省略)から媒体記録内容に
対応した磁束が誘導されて磁界Hが生じる補助磁極3の
側近に配設することにより、該補助磁極3の磁界Hが作
用してこの磁気抵抗効果素子5内に磁化Mが発生し、こ
れに伴なってその電気抵抗値が変化する。したがって、
この磁気抵抗効果素子5の上記両端電極間における電圧
Vの変化を監視していれば、上記記録媒体1M上の磁界
変化が検出できることになり、前述した記録媒体RMへ
の電磁変換記録信号は上記電圧■によって有効に再生さ
れる。In FIG. 2, 5 is the magnetoresistive element, 6 is a constant current source that supplies a constant current through the electrodes at both ends of the magnetoresistive element 50, and the magnetoresistive element 5 in such a state is When some kind of magnetic field acts on it, its electrical resistance changes due to heat. That is, as shown in FIG. 2, when the magnetoresistive effect cable 5 to which the constant electric current KI is applied, a magnetic flux corresponding to the recorded content of the medium is induced from the main magnetic pole (not shown) during reproduction, and a magnetic field H is generated. By disposing it near the auxiliary magnetic pole 3 where the auxiliary magnetic pole 3 is generated, the magnetic field H of the auxiliary magnetic pole 3 acts to generate magnetization M in the magnetoresistive element 5, and the electric resistance value changes accordingly. do. therefore,
By monitoring the change in the voltage V between the electrodes at both ends of the magnetoresistive element 5, changes in the magnetic field on the recording medium 1M can be detected, and the electromagnetic conversion recording signal to the recording medium RM described above can be detected as described above. It is effectively regenerated by the voltage ■.
次曇こ、垂直磁気ヘッドにおいては、上記の磁気抵抗効
果素子による信号再生がなぜ有利か、その理由曇こつい
て第3図を参照して説明する。Next, the reason why signal reproduction using the above magnetoresistive element is advantageous in a perpendicular magnetic head will be explained with reference to FIG.
第3図は、先の第1図に示したような補助磁極励磁型の
垂直磁気ヘッドの入出力特性の一例を示すものであり、
特にここでは、特性曲線A1として主磁極厚が0.8μ
mで垂直磁気記録媒体へのデータ記録密度が5Kbpi
(bit/1nch ) (Dときの同垂直磁気ヘッ
ドの入出力特性を、特性面!l!A2として主磁極厚が
同じ<0.8μmで上記データ記録密度が3QKbpi
のときの同垂直磁気ヘッドの入出力特性を、さらに特性
曲線B1として主磁極厚が0.3μmでデータ記録密度
が5Kbpiのときの同垂直磁気ヘッドの入出力特性を
、特性曲線B2として主磁極厚が0.3μmでデータ記
録密度が30Kbpiのときの同垂直磁気ヘッドの入出
力特性を、そして特性曲線B3として主磁極厚が0.3
μmでデータ記録密度が5QKbpiのときの同垂直磁
気ヘッドの入出力特性を示している。FIG. 3 shows an example of the input/output characteristics of the auxiliary pole excitation type perpendicular magnetic head as shown in FIG. 1 above.
In particular, here, the main magnetic pole thickness is 0.8μ as the characteristic curve A1.
m and the data recording density on the perpendicular magnetic recording medium is 5Kbpi
(bit/1nch) (The input/output characteristics of the same perpendicular magnetic head at time D are the characteristic side !l!A2, where the main magnetic pole thickness is the same <0.8 μm and the above data recording density is 3QKbpi.
Characteristic curve B1 shows the input/output characteristics of the same perpendicular magnetic head when the main magnetic pole thickness is 0.3 μm and data recording density is 5 Kbpi, and characteristic curve B2 shows the input/output characteristics of the same perpendicular magnetic head when the main magnetic pole thickness is 0.3 μm and the data recording density is 5 Kbpi. The input/output characteristics of the perpendicular magnetic head when the thickness is 0.3 μm and the data recording density is 30 Kbpi are shown as characteristic curve B3, and the main pole thickness is 0.3 μm.
It shows the input/output characteristics of the same perpendicular magnetic head when the data recording density is 5QKbpi in μm.
このような第3図の特性について整理すると、主磁極厚
が薄くなり、上記データ記録密度が60Kbpiと高く
なっても、再生出力が飽和する起磁力はほぼ一定である
ということがいえる。すなわち、主磁極が薄くて、超高
密度記録がなされているときでも垂直磁気記録媒体はほ
ぼ飽和記録されている。したがって、このような超高密
度記録がなされたときに再生出力が低下する主因は垂直
磁気ヘッド自体の再生系の損失にあるということになる
。そしてこの再生系の損失の原因の1つに、補助磁極に
巻回されて前述した電磁変換を行う励磁コイルの信号再
生能率の低さが挙げられる。この点、上述した磁気抵抗
効果によって信号再生を行う磁気抵抗効果素子は、上記
電磁変換法におけるような信号再生損失がほとんどない
ため、超高密度記録がなされているような場合であって
も再生出力レベルを落とすことなく有効かつ高能率に記
録信号の再生を行うことができる。Summarizing the characteristics shown in FIG. 3, it can be said that even if the main magnetic pole thickness becomes thinner and the data recording density increases to 60 Kbpi, the magnetomotive force at which the reproduction output is saturated remains almost constant. That is, even when the main pole is thin and ultra-high density recording is being performed, the perpendicular magnetic recording medium is almost saturated with recording. Therefore, the main reason why the reproduction output decreases when such ultra-high density recording is performed is the loss in the reproduction system of the perpendicular magnetic head itself. One of the causes of this loss in the reproduction system is the low signal reproduction efficiency of the excitation coil that is wound around the auxiliary magnetic pole and performs the electromagnetic conversion described above. In this regard, the magnetoresistive element, which reproduces signals using the magnetoresistive effect described above, has almost no signal reproduction loss as in the electromagnetic conversion method described above, so it is difficult to reproduce signals even when ultra-high-density recording is performed. Recorded signals can be effectively and highly efficiently reproduced without reducing the output level.
第4図に、このような磁気抵抗効果素子を具えたこの発
明にかかる重置磁気ヘッドの一実施例を示す。ただし、
同第4図においては、便宜上この実施例ヘッドの補助磁
極部のみを示し、垂直磁気記録媒体を挾んで同補助磁極
と対向するよう配置される(第4図においてはこの補助
磁極の上部に配置される)主磁極部の図示は省略した。FIG. 4 shows an embodiment of a superimposed magnetic head according to the present invention, which is equipped with such a magnetoresistive element. however,
In FIG. 4, only the auxiliary magnetic pole portion of this embodiment head is shown for convenience, and it is arranged so as to sandwich the perpendicular magnetic recording medium and face the auxiliary magnetic pole (in FIG. 4, it is arranged above the auxiliary magnetic pole). ) The illustration of the main magnetic pole portion is omitted.
さて第4図において、30が補助磁極、40がこの補助
磁極30Jこ巻装された励磁コイル、40Lが該励磁コ
イル40のリード線、50が磁気抵抗効果素子、50P
が該磁気抵抗効果素子50の定電流印加電極であり、同
実施例においては、上記電極50Pを含む磁気抵抗効果
素子50は補助磁極30に直接固着され同補助磁極30
と一体となって補助磁極ブロックを形成している。そし
てこの実施例ヘッドでは、上記リード線40Lが図示し
ない記録信号出力装置に電気的に接続され、また上記電
極50Pが図示しない定電流源および信号再生装置に電
気的に接続されて、垂直磁気記録媒体への信号記録の際
には上記励磁コイル40による記録信号の電磁変換によ
って同記録媒体への磁気記録を行い、また同記録媒体か
らの信号再生の際には上記磁気抵抗効果素子50による
前述した磁気抵抗効果によって同信号の再生を行うよう
になる。Now, in FIG. 4, 30 is an auxiliary magnetic pole, 40 is an excitation coil wound around this auxiliary magnetic pole 30J, 40L is a lead wire of the excitation coil 40, 50 is a magnetoresistive element, 50P
is a constant current applying electrode of the magnetoresistive element 50, and in the same embodiment, the magnetoresistive element 50 including the electrode 50P is directly fixed to the auxiliary magnetic pole 30.
Together with this, it forms an auxiliary magnetic pole block. In this embodiment head, the lead wire 40L is electrically connected to a recording signal output device (not shown), and the electrode 50P is electrically connected to a constant current source and a signal reproducing device (not shown) to perform perpendicular magnetic recording. When recording a signal on a medium, magnetic recording is performed on the recording medium by electromagnetic conversion of the recording signal by the excitation coil 40, and when reproducing a signal from the recording medium, the aforementioned magnetoresistive element 50 performs magnetic recording. The same signal is reproduced by the magnetoresistance effect.
垂直磁気ヘッドをこのような構成とすることにより、前
述したような超高密度記録を行った場合であっても有効
かつ高能率に同記録信号の再生を行うことができるとと
もに、上記リード!I4<)Lと電極50Pとを同一方
向から引き出すことができるため、垂直磁気記録装置と
しての構成も簡単化される。By configuring the perpendicular magnetic head in this manner, even when ultra-high-density recording is performed as described above, the recorded signal can be effectively and highly efficiently reproduced, and the read! Since I4<)L and the electrode 50P can be drawn out from the same direction, the configuration of the perpendicular magnetic recording device is also simplified.
なお、上記の実施例においては、補助磁極3゜として抵
抗率lの大きいNi−Znフェライト等を用いることを
前提としたため、磁気抵抗効果素子50とこの定電流印
加電極50Pとを同補助磁極30に直接固着する構造と
したが、この補助磁極30として抵抗率ρの小さいMn
−Znフェライト等を用いる場合lこけ、#!5図に示
すように適宜な絶縁体薄膜70を介してこれら磁気抵抗
効果素子50および定電流印加電極50Pを同補助磁極
30に固着するようにすることが望ましい。In the above embodiment, since it is assumed that Ni-Zn ferrite or the like having a large resistivity l is used as the auxiliary magnetic pole 3°, the magnetoresistive element 50 and this constant current applying electrode 50P are connected to the auxiliary magnetic pole 30. However, this auxiliary magnetic pole 30 is made of Mn, which has a small resistivity ρ.
- When using Zn ferrite etc. l moss, #! As shown in FIG. 5, it is desirable to fix the magnetoresistive element 50 and the constant current applying electrode 50P to the auxiliary magnetic pole 30 via a suitable insulating thin film 70.
第1図は補助磁極励磁型垂直磁気ヘッドの基本構成を示
す斜視図、第2図はこの発明における磁気抵抗効果素子
の信号再生原理を説明するための斜視図、第3図は第4
図に示したような補助磁極励磁型垂直磁気ヘッドの入出
力特性例を示す線図、第4図はこの発明にかかる垂直磁
気ヘッド−実施例を示す斜視図、aI5図はこの発明に
かかる垂直磁気ヘッドの他の実施例を示す斜視図である
。
1・・主磁極、2・・・非磁性体ホルダ、3,30・・
補助磁極、4,40・・・励磁コイル、40L・・・励
磁コイルリード線、5,50・・・磁気抵抗効果素子、
50P・・・定電流印加電極、6・・・定電流源、7o
・・絶縁体薄膜。
第4図
第5図
0LFIG. 1 is a perspective view showing the basic configuration of an auxiliary pole excitation type perpendicular magnetic head, FIG.
4 is a perspective view showing an embodiment of the perpendicular magnetic head according to the present invention, and FIG. FIG. 7 is a perspective view showing another embodiment of the magnetic head. 1... Main magnetic pole, 2... Non-magnetic material holder, 3, 30...
Auxiliary magnetic pole, 4, 40... Excitation coil, 40L... Excitation coil lead wire, 5, 50... Magnetoresistive element,
50P... Constant current applying electrode, 6... Constant current source, 7o
...Insulator thin film. Figure 4 Figure 5 0L
Claims (1)
極と、該主磁極に前記垂直磁気記録媒体を介して対向す
るよう配されてかつ励磁コイルが巻装された補助磁極と
、該補助磁極に近接した位置に配される磁気抵抗効果素
子と、該磁気抵抗効果素子に定電流を印加するための電
極とを具え、前記補助磁極を励磁して生じる前記主磁極
の垂直磁界に基づいて前記垂直磁気記録媒体への信号記
録を行い、前記磁気抵抗効果素子の定電流印加電極間に
生じる電圧変化に基づいて前記垂直磁気記録媒体からの
信号再生を行う垂直磁気ヘッド。 (2) 前記磁気抵抗効果素子とこの定電流印加電極と
は、前記補助磁極に一体形成される特許請求の範囲第(
1)項記載の重置磁気ヘッド。[Claims] (IJ) A main magnetic pole arranged perpendicularly to a perpendicular magnetic recording medium, and an excitation coil arranged to face the main magnetic pole with the perpendicular magnetic recording medium interposed therebetween. The main magnetic pole, which is generated by exciting the auxiliary magnetic pole, includes an auxiliary magnetic pole, a magnetoresistive element disposed close to the auxiliary magnetic pole, and an electrode for applying a constant current to the magnetoresistive element. a perpendicular magnetic head that records signals on the perpendicular magnetic recording medium based on a perpendicular magnetic field of the perpendicular magnetic recording medium and reproduces signals from the perpendicular magnetic recording medium based on voltage changes occurring between constant current applying electrodes of the magnetoresistive element; (2) The magnetoresistive element and the constant current applying electrode are integrally formed with the auxiliary magnetic pole.
1) The overlapping magnetic head described in item 1).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19363183A JPS6085408A (en) | 1983-10-17 | 1983-10-17 | Vertical magnetic head |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19363183A JPS6085408A (en) | 1983-10-17 | 1983-10-17 | Vertical magnetic head |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6085408A true JPS6085408A (en) | 1985-05-14 |
Family
ID=16311152
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19363183A Pending JPS6085408A (en) | 1983-10-17 | 1983-10-17 | Vertical magnetic head |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6085408A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04123113U (en) * | 1991-04-25 | 1992-11-06 | 丸善工業株式会社 | carry bag |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5488110A (en) * | 1977-12-26 | 1979-07-13 | Toshiba Corp | Vertical magnetization recorder-reproducer |
-
1983
- 1983-10-17 JP JP19363183A patent/JPS6085408A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5488110A (en) * | 1977-12-26 | 1979-07-13 | Toshiba Corp | Vertical magnetization recorder-reproducer |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04123113U (en) * | 1991-04-25 | 1992-11-06 | 丸善工業株式会社 | carry bag |
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