JPH0758533B2 - Thin film magnetic head - Google Patents

Thin film magnetic head

Info

Publication number
JPH0758533B2
JPH0758533B2 JP21213088A JP21213088A JPH0758533B2 JP H0758533 B2 JPH0758533 B2 JP H0758533B2 JP 21213088 A JP21213088 A JP 21213088A JP 21213088 A JP21213088 A JP 21213088A JP H0758533 B2 JPH0758533 B2 JP H0758533B2
Authority
JP
Japan
Prior art keywords
coil
magnetic core
thin film
magnetic head
input
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
Application number
JP21213088A
Other languages
Japanese (ja)
Other versions
JPH0261810A (en
Inventor
啓之 大橋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP21213088A priority Critical patent/JPH0758533B2/en
Publication of JPH0261810A publication Critical patent/JPH0261810A/en
Publication of JPH0758533B2 publication Critical patent/JPH0758533B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G11B5/31—Structure or manufacture of heads, e.g. inductive using thin films
    • 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
    • G11B5/10—Structure or manufacture of housings or shields for heads
    • G11B5/11—Shielding of head against electric or magnetic fields

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は薄膜磁気ヘッドに関し、特に放電現象による雑
音信号の発生を防止する改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film magnetic head, and more particularly to an improvement for preventing generation of a noise signal due to a discharge phenomenon.

（発明の背景） 従来、薄膜磁気ヘッドは磁気コアおよびコイルを薄膜形
成法によって形成しており、磁気コアとコイルの間は薄
膜のコイル絶縁層で絶縁してある。(Background of the Invention) Conventionally, in a thin film magnetic head, a magnetic core and a coil are formed by a thin film forming method, and the magnetic core and the coil are insulated by a thin coil insulating layer.

記録あるいは再生を行うときは磁気コアが僅かな間隙を
介して磁気ディスクのような記録媒体と対面している。
該記録媒体は通常アース電位になっている。コイルの引
き出し導体の端部には入出力線接続部分が形成してあ
り、該接続部分とたとえばリード・ライトICなどを用い
た記録・再生回路とは入出力線で接続している。しかる
に上述した従来の薄膜磁気ヘッドでは記録媒体の走行中
これと共に移動する空気が磁気コアの記録媒体対向面と
摩擦することによって磁気コアが帯電する。When recording or reproducing, the magnetic core faces a recording medium such as a magnetic disk with a slight gap.
The recording medium is usually at ground potential. An input / output line connection portion is formed at an end of the lead conductor of the coil, and the connection portion and a recording / reproducing circuit using, for example, a read / write IC are connected by an input / output line. However, in the above-described conventional thin-film magnetic head, the magnetic core is charged by the air moving along with the recording medium traveling along with the surface of the recording medium facing the recording medium.

この帯電した磁気コアと金属膜製のような導電性の記録
媒体（以下、導電性記録媒体という）が接触すると、前
述したように導電性記録媒体が通常アース電位になって
いるので磁気コアから該導電性記録媒体への放電が生
じ、これによってコイルに雑音信号が生じる。また磁気
コアとコイルがコイル絶縁層を介して静電的に結合して
いるので磁気コアの帯電によってコイルも帯電しコイル
と磁気コアとの間に電位差が生ずるが、コイルと磁気コ
アの間のコイル絶縁層が薄膜で形成されていて放電し易
いので、磁気コアと導電性記録媒体が接触していなくて
もコイルからコイル絶縁層、磁気コアを経て導電性記録
媒体に放電が生じ易く、該放電現象によってもコイルに
雑音信号が生じる。When the charged magnetic core comes into contact with a conductive recording medium such as a metal film (hereinafter referred to as a conductive recording medium), the conductive recording medium is normally at the ground potential as described above. A discharge is generated in the conductive recording medium, which causes a noise signal in the coil. Further, since the magnetic core and the coil are electrostatically coupled via the coil insulating layer, the coil is charged by the charging of the magnetic core and a potential difference is generated between the coil and the magnetic core. Since the coil insulating layer is formed of a thin film and easily discharges, even if the magnetic core and the conductive recording medium are not in contact with each other, discharge easily occurs from the coil to the conductive recording medium through the coil insulating layer and the magnetic core. A noise signal is also generated in the coil due to the discharge phenomenon.

本発明の出願人は、上記の欠点を改良できる薄膜磁気ヘ
ッドの発明について現在特許出願中である。出願中の薄
膜磁気ヘッドは、一端が磁気コアと接続し他端には外部
からの接地用リード線が接続される接続部分を設けた導
体を有しているか、あるいは磁気コアの一部分に接地用
リード線が接続される接続部分を有している。したがっ
て、これらの接続部分に外部からの接地用リード線を接
続することにより磁気コアから電荷がアースの方へ移動
してしまい該磁気コアが摩擦電気を帯びなくなるので、
アース電位の導電性記録媒体に対して上記の帯電による
放電が生じなくなりコイルに雑音信号が発生しなくな
る。The applicant of the present invention is currently applying for a patent of the invention of a thin film magnetic head capable of improving the above-mentioned drawbacks. The thin-film magnetic head in the application has a conductor with one end connected to the magnetic core and the other end provided with a connection part to which an external grounding lead wire is connected, or a part of the magnetic core for grounding. It has a connecting portion to which the lead wire is connected. Therefore, by connecting the grounding lead wire from the outside to these connecting portions, the electric charge moves from the magnetic core to the ground, and the magnetic core does not become triboelectrically charged.
The above-mentioned discharge due to the charging does not occur with respect to the conductive recording medium having the ground potential, and the noise signal does not occur in the coil.

（発明が解決しようとする課題） しかしながら、上述した出願中の薄膜磁気ヘッドには次
のような問題点がある。すなわち、コイルの引き出し導
体の端部に入出力線接続部分を形成しており、該接続部
分とたとえばリード・ライトICなどを用いた記録・再生
回路とを入出力線で接続しているので、コイルの電位は
常に記録・再生回路の入出力端と同じになってしまう。(Problems to be Solved by the Invention) However, the above-mentioned pending thin film magnetic head has the following problems. That is, since the input / output line connecting portion is formed at the end of the lead conductor of the coil and the connecting portion and the recording / reproducing circuit using, for example, a read / write IC are connected by the input / output line, The coil potential is always the same as the input / output terminal of the recording / reproducing circuit.

しかも、この記録・再生回路の入出力端の電位はアース
電位とは異なるのでコイルとアース電位の磁気コアの間
に電位差が生じる。コイルと磁気コアの間のコイル絶縁
層は薄膜で形成されていて放電し易いので、上記の電位
差によってコイルからコイル絶縁層、磁気コアを経てア
ースに向かう放電が生じ、該放電によってコイルに雑音
信号が生ずる。以上のように、出願中の薄膜磁気ヘッド
はコイルの電位が記録・再生回路の入出力端と同じにな
ってしまうことによってコイルとアース電位の磁気コア
の間に電位差が生じ、しかもコイル絶縁層が薄膜で形成
されていて放電し易いことによってコイルからアースに
向かう放電が生じるので該放電によってコイルに雑音信
号が生じるという問題がある。Moreover, since the potential at the input / output terminal of this recording / reproducing circuit is different from the ground potential, there is a potential difference between the coil and the magnetic core at the ground potential. Since the coil insulating layer between the coil and the magnetic core is formed of a thin film and easily discharges, the above potential difference causes discharge from the coil toward the ground through the coil insulating layer and the magnetic core, and the discharge causes a noise signal to the coil. Occurs. As described above, in the thin-film magnetic head of the present application, the potential of the coil becomes the same as the input / output terminal of the recording / reproducing circuit, so that a potential difference occurs between the coil and the magnetic core of the ground potential, and the coil insulating layer Since it is formed of a thin film and easily discharges, a discharge from the coil toward the ground occurs, which causes a problem that a noise signal is generated in the coil.

本発明の目的は、磁気コアを接地するようにすることに
よって磁気コアの摩擦帯電が防げ、且つコイルの引き出
し導体の端部と入出力線接続用の接続導体との間でカッ
プリング・キャパシタを構成するようにすることによっ
て記録・再生回路の直流電位がコイルにかかるのを遮断
し、これによって磁気コアの摩擦帯電による放電だけで
なく記録・再生回路との接続で生ずるコイルとアース電
位の磁気コアの間の電位差による放電もなくすことがで
き、コイルに放電による雑音信号が一切発生しない薄膜
磁気ヘッドを提供することである。An object of the present invention is to prevent frictional electrification of the magnetic core by grounding the magnetic core and to form a coupling capacitor between the end of the lead conductor of the coil and the connecting conductor for connecting the input / output line. By configuring it, the DC potential of the recording / reproducing circuit is blocked from being applied to the coil, so that not only the discharge due to the frictional charging of the magnetic core but also the magnetic field of the coil and the ground potential generated by the connection with the recording / reproducing circuit. An object of the present invention is to provide a thin film magnetic head which can eliminate discharge due to a potential difference between cores and in which no noise signal due to discharge is generated in a coil.

（課題を解決するための手段） 本発明の薄膜磁気ヘッドは上記の目的を達成するために
次の手段構成を有する。(Means for Solving the Problems) The thin film magnetic head of the present invention has the following means and structure for achieving the above object.

すなわち本発明の薄膜磁気ヘッドは、磁気コアの一部分
にアース電位の導体が接続される接続部分を設けるとと
もに、コイルの引き出し導体の端部は誘電体層を介して
入出力線接続用の接続導体と結合していることを特徴と
するものである。That is, in the thin-film magnetic head of the present invention, a connecting portion to which a conductor of earth potential is connected is provided in a part of the magnetic core, and the end of the lead conductor of the coil is connected to the input / output line via the dielectric layer. It is characterized by being combined with.

（作 用） 以下、上記の手段構成を有する本発明の薄膜磁気ヘッド
の作用を説明する。(Operation) The operation of the thin-film magnetic head of the present invention having the above-mentioned constitution will be described below.

本発明の薄膜磁気ヘッドは、磁気コアの一部分にアース
電位の導体が接続される接続部分が設けられている。し
たがって、これらの接続部分にアース電位の導体を接続
することにより磁気コアから電荷がアースの方へ移動し
てしまい該磁気コアが摩擦電気を帯びなくなるので、ア
ース電位の導電性記録媒体に対して上記の帯電による放
電が生じなくなりコイルに雑音信号が発生しなくなる。
またコイルの引き出し導体の端部は誘電体層を介して入
出力線接続用の接続導体と結合しているので、該接続導
体と入出力線で接続した記録・再生回路の入出力端は薄
膜磁気ヘッドのコイルとカップリング・キャパシタを介
して接続されることになる。したがって記録・再生回路
の入出力端がアース電位と異なる電位であっても、この
記録・再生回路の入出力端の直流電位がコイルにかかる
のを遮断することができるようによってコイルはアース
電位のままで磁気コアとの間に電位差を生じない。これ
により、コイルから磁気コアを経てアースへ向かう放電
が生じなくなりコイルに雑音信号が発生しなくなる。In the thin film magnetic head of the present invention, a connecting portion to which a conductor of earth potential is connected is provided in a part of the magnetic core. Therefore, by connecting a conductor of earth potential to these connecting portions, the electric charge moves from the magnetic core toward the earth, and the magnetic core does not carry triboelectricity. The above-mentioned discharge due to charging does not occur, and no noise signal occurs in the coil.
Further, since the end of the lead conductor of the coil is connected to the connecting conductor for connecting the input / output line through the dielectric layer, the input / output end of the recording / reproducing circuit connected to the connecting conductor by the input / output line is a thin film. It will be connected to the coil of the magnetic head via a coupling capacitor. Therefore, even if the input / output terminal of the recording / reproducing circuit is at a potential different from the ground potential, the coil is kept at the ground potential by blocking the direct current potential at the input / output terminal of the recording / reproducing circuit from being applied to the coil. Until then, there is no potential difference with the magnetic core. As a result, discharge from the coil to the ground via the magnetic core does not occur, and no noise signal is generated in the coil.

（実 施 例） 以下、本発明の薄膜磁気ヘッドの実施例を図面を参照し
て説明する。(Examples) Examples of the thin-film magnetic head of the present invention will be described below with reference to the drawings.

第１図は本発明の薄膜磁気ヘッドの実施例の構成を示す
図である。図（ａ）は実施例の薄膜磁気ヘッドの後端部
を示し、図（ｂ）は図（ａ）のＡ・Ａ線断面を示し、図
（ｃ）は図（ａ）のＢ・Ｂ線断面を示す。図（ｂ）に示
すようにアルミナ・チタンカーバイド製のスライダ10の
後端面には下部絶縁層５を介して下部磁気コア22とこれ
に接合する上部磁気コア21およびコイル１が形成してあ
る。上部磁気コア21および下部磁気コア22はスパッタや
電気メッキなどによって形成したニッケル−鉄合金の薄
膜で、上部磁気コア21と下部磁気コア22はコイル絶縁層
３を介してコイル１を挟んでおり、両コアの記録媒体対
向面の間には記録媒体の走行方向で0.1〜1.0μｍのギャ
ップが形成してある。下部磁気コア22は記録媒体対向面
とは反対側に薄膜磁気ヘッドの背面まで伸ばしてあり、
該ヘッドの背面にチタン膜（この外、ニッケルや金の膜
でも良い）で形成した磁気コア接地用端子部25に接合さ
せてある。これが、課題解決手段にいうアース電位の導
体が接続される接続部分である。FIG. 1 is a diagram showing the configuration of an embodiment of the thin film magnetic head of the present invention. FIG. 7A shows the rear end portion of the thin film magnetic head of the embodiment, FIG. 8B shows a cross section taken along the line AA of FIG. 10A, and FIG. A cross section is shown. As shown in FIG. 2B, a lower magnetic core 22, an upper magnetic core 21 and a coil 1 bonded to the lower magnetic core 22 are formed on the rear end surface of the slider 10 made of alumina / titanium carbide via the lower insulating layer 5. The upper magnetic core 21 and the lower magnetic core 22 are nickel-iron alloy thin films formed by sputtering or electroplating, and the upper magnetic core 21 and the lower magnetic core 22 sandwich the coil 1 with the coil insulating layer 3 interposed therebetween. A gap of 0.1 to 1.0 μm is formed between the surfaces of both cores facing the recording medium in the running direction of the recording medium. The lower magnetic core 22 extends to the back surface of the thin film magnetic head on the side opposite to the recording medium facing surface,
It is bonded to the magnetic core grounding terminal portion 25 formed of a titanium film (a nickel film or a gold film may be used as well) on the back surface of the head. This is the connecting portion to which the conductor of earth potential referred to in the problem solving means is connected.

該磁気コア接地用端子部25はスライダ10の背面に接合し
て形成してあり該スライダ10は図示していないジンバル
ばねと導電性接着剤で結合している。該ジンバルばねは
通常アース電位になっているので、上記磁気コア21又は
下部磁気コア22に摩擦電気が発生しても該電荷は下部磁
気コア22と磁気コア接地用端子部25は経てアースの方へ
移動してしまい上部磁気コア21および下部磁気コア22は
摩擦電気を帯びなくなる。The magnetic core grounding terminal portion 25 is formed by being joined to the back surface of the slider 10, and the slider 10 is joined to a gimbal spring (not shown) by a conductive adhesive. Since the gimbal spring is normally at the earth potential, even if triboelectricity is generated in the magnetic core 21 or the lower magnetic core 22, the electric charge is passed through the lower magnetic core 22 and the magnetic core grounding terminal portion 25 to the earth side. Therefore, the upper magnetic core 21 and the lower magnetic core 22 are not charged with triboelectricity.

したがってアース電位の導電性記録媒体に対して上記の
帯電による放電が生じなくなりコイル１に雑音信号が発
生しなくなる。Therefore, the discharge due to the above charging does not occur in the conductive recording medium having the ground potential, and the noise signal does not occur in the coil 1.

また、図（ｃ）に示したコイルの引き出し導体11および
入出力用端子部15はともにコイル１と同じ銅で形成さ
れ、コイルの引き出し導体11の端部は誘電体層12を介し
て上記の入出力用端子部15に結合している。入出力用端
子部15と図示していないリード・ライトICはワイヤボン
ディングによって接続してある。以上のようにしてコイ
ルの引き出し導体11の端部と誘電体層12と入出力用端子
部15で形成したコンデンサは、10MHz程度の信号の伝達
に対して10-8F以上の容量を持つことが好ましいので、
この容量を持つために誘電体層12の厚さは数百オングス
トローク以下、コイルの引き出し導体11の端部と入出力
用端子部15の対向面積は10-8m2以上にしてある。また本
実施例では誘電体層12を保護膜７と別に設けているが、
保護膜７と誘電体層12を同材質とする構成にしても良
い。以上のようにしたことによってコイル１とリード・
ライトICをカップリング・キャパシタを介して接続した
ことになるので、リード・ライトICの入出力端がアース
電位と異なる電位であっても、このリード・ライトICの
入出力端の直流電位がコイルにかかるのを遮断すること
ができることによってコイル１はアース電位のままで上
部磁気コア21又は下部磁気コア22との間に電位差を生じ
ない。Further, the lead conductor 11 and the input / output terminal portion 15 of the coil shown in FIG. 7C are both formed of the same copper as the coil 1, and the end portion of the lead conductor 11 of the coil has the dielectric layer 12 interposed therebetween. It is connected to the input / output terminal section 15. The input / output terminal portion 15 and the read / write IC (not shown) are connected by wire bonding. As described above, the capacitor formed by the end portion of the lead conductor 11 of the coil, the dielectric layer 12, and the input / output terminal portion 15 must have a capacitance of 10 -8 F or more for transmitting a signal of about 10 MHz. Is preferred,
In order to have this capacitance, the thickness of the dielectric layer 12 is several hundred angstroms or less, and the facing area between the end portion of the lead conductor 11 of the coil and the input / output terminal portion 15 is 10 -8 m 2 or more. Further, in this embodiment, the dielectric layer 12 is provided separately from the protective film 7,
The protective film 7 and the dielectric layer 12 may be made of the same material. By doing the above, the coil 1 and the lead
Since the write IC is connected via the coupling capacitor, even if the input / output terminal of the read / write IC is different from the ground potential, the DC potential at the input / output terminal of this read / write IC is the coil. Since it is possible to block this, the coil 1 remains at the ground potential and no potential difference is generated between the coil 1 and the upper magnetic core 21 or the lower magnetic core 22.

これにより、コイル１からアースに向かう放電が生じな
くなりコイル１に雑音信号が発生しなくなる。As a result, the discharge from the coil 1 to the ground does not occur and the noise signal does not occur in the coil 1.

（発明の効果） 以上説明したように、本発明の薄膜磁気ヘッドは、磁気
コアの一部分にアース電位の導体が接続される接続部分
を設けるようにしたことによって磁気コアを接地して摩
擦帯電が防げるようになり、且つコイルの引き出し導体
の端部が誘電体層を介して入出力線接続用の接続導体と
結合するようにしたことによってコイルと記録・再生回
路とがカップリング・キャパシタを介して接続されるこ
とによって記録再生回路の直流電位がコイルにかかるの
を遮断することができ、これによって磁気コアの摩擦帯
電による放電だけでなく記録・再生回路との接続で生ず
るコイルとアース電位の磁気コアの間の電位差による放
電もなくすことができ、コイルに放電による雑音信号が
一切発生しなくなるという利点を有する。(Effects of the Invention) As described above, in the thin-film magnetic head of the present invention, the magnetic core is grounded and the triboelectrification is performed by providing the connecting portion to which the conductor of the ground potential is connected to a part of the magnetic core. In addition, the end of the lead conductor of the coil is coupled to the connecting conductor for connecting the input / output line through the dielectric layer, so that the coil and the recording / reproducing circuit are connected via the coupling capacitor. It is possible to block the direct current potential of the recording / reproducing circuit from being applied to the coil by the connection, and this not only discharges due to frictional charging of the magnetic core, but also the potential of the coil and ground potential generated by the connection with the recording / reproducing circuit. There is an advantage that the discharge due to the potential difference between the magnetic cores can be eliminated, and no noise signal due to the discharge is generated in the coil.

【図面の簡単な説明】[Brief description of drawings]

第１図は本発明の薄膜磁気ヘッドの実施例の構成を示す
図である。 １……コイル、３……コイル絶縁層、５……下部絶縁
層、７……保護膜、10……スライダ、11……コイルの引
き出し導体、12……誘電体層、15……入出力用端子部、
21……上部磁気コア、22……下部磁気コア、25……磁気
コア接地用端子部。FIG. 1 is a diagram showing the configuration of an embodiment of the thin film magnetic head of the present invention. 1 ... Coil, 3 ... Coil insulation layer, 5 ... Lower insulation layer, 7 ... Protective film, 10 ... Slider, 11 ... Coil lead conductor, 12 ... Dielectric layer, 15 ... Input / output Terminal part,
21 …… Upper magnetic core, 22 …… Lower magnetic core, 25 …… Magnetic core ground terminal.

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】磁気コアの一部分にアース電位の導体が接
続される接続部分を設けるとともに、コイルの引き出し
導体の端部は誘電体層を介して入出力線接続用の接続導
体と結合していることを特徴とする薄膜磁気ヘッド。1. A connecting portion to which a conductor of earth potential is connected is provided in a part of a magnetic core, and an end portion of a lead conductor of a coil is connected to a connecting conductor for connecting an input / output line through a dielectric layer. A thin film magnetic head characterized in that
JP21213088A 1988-08-26 1988-08-26 Thin film magnetic head Expired - Fee Related JPH0758533B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21213088A JPH0758533B2 (en) 1988-08-26 1988-08-26 Thin film magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21213088A JPH0758533B2 (en) 1988-08-26 1988-08-26 Thin film magnetic head

Publications (2)

Publication Number Publication Date
JPH0261810A JPH0261810A (en) 1990-03-01
JPH0758533B2 true JPH0758533B2 (en) 1995-06-21

Family

ID=16617391

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21213088A Expired - Fee Related JPH0758533B2 (en) 1988-08-26 1988-08-26 Thin film magnetic head

Country Status (1)

Country Link
JP (1) JPH0758533B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5142425A (en) * 1990-08-09 1992-08-25 Hewlett-Packard Company Disk drive in which magnetic head-to-disk capacitive coupling is eliminated
JPH08111015A (en) * 1994-09-01 1996-04-30 Tdk Corp Supporting device of magnetic head slider and magnetic head device
CN1145933C (en) 1998-11-13 2004-04-14 Tdk株式会社 Supporting mechanism and system for recording/reproducing head

Also Published As

Publication number Publication date
JPH0261810A (en) 1990-03-01

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