JPH0546929A - Thin film magnetic head - Google Patents
Thin film magnetic headInfo
- Publication number
- JPH0546929A JPH0546929A JP22842091A JP22842091A JPH0546929A JP H0546929 A JPH0546929 A JP H0546929A JP 22842091 A JP22842091 A JP 22842091A JP 22842091 A JP22842091 A JP 22842091A JP H0546929 A JPH0546929 A JP H0546929A
- Authority
- JP
- Japan
- Prior art keywords
- film
- magnetic
- thin film
- magnetic head
- thin
- 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
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- Magnetic Heads (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、浮上型の薄膜磁気ヘッ
ドに関し、更に詳しくは、薄膜磁気変換素子を構成する
コイル膜と磁性膜との間に発生するキャパシタの蓄積電
荷に起因する放電を防止し得る薄膜磁気ヘッドに係る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a levitation type thin film magnetic head, and more specifically, to a discharge caused by an accumulated charge of a capacitor generated between a coil film and a magnetic film forming a thin film magnetic conversion element. The present invention relates to a thin film magnetic head that can be prevented.
【０００２】[0002]
【従来の技術】この種の薄膜磁気ヘッドは、スライダ
と、薄膜磁気変換素子とを有し、薄膜磁気変換素子があ
る電位に保たれるコイル膜と、コイル膜と共に薄膜磁気
回路を構成する磁性膜とを有しており、磁性膜とコイル
膜との間にキャパシタが発生する。2. Description of the Related Art A thin film magnetic head of this type has a slider and a thin film magnetic conversion element, and a coil film that holds the thin film magnetic conversion element at a certain potential, and a magnetic film that constitutes a thin film magnetic circuit together with the coil film. And a film, and a capacitor is generated between the magnetic film and the coil film.
【０００３】一方、最近の小型ＨＤＤでは、パソコン搭
載を考慮してパソコン電源である５ボルト、１２ボルト
をそのまま利用すべく、小型ＨＤＤ用の読み書き用ＩＣ
も５ボルトまたは１２ボルトの片電源を用いるようにな
っている。このため、薄膜磁気ヘッドは一定電圧、具体
的には、６ボルトの正電圧で常時バイアスされる。その
結果、キャパシタはバイアス電圧により常時一方向に電
荷が蓄積される。On the other hand, in the recent compact HDD, a read / write IC for the compact HDD is used so that the personal computer power supply of 5 volt or 12 volt can be used as it is in consideration of mounting on a personal computer.
Also uses a single 5 or 12 volt power supply. Therefore, the thin film magnetic head is constantly biased with a constant voltage, specifically, a positive voltage of 6 volts. As a result, the capacitor always accumulates charges in one direction due to the bias voltage.
【０００４】キャパシタに蓄積された電荷はポ−ル部と
媒体との間の接触などによる放電により放出され、磁性
膜の電位が変動する。磁性膜の電位変動によりコモンモ
ードノイズが発生し、読み取りデ−タにエラ−を生じ
る。かかる放電防止技術に関する先行技術文献として
は、例えば、特開平２−２４６０４８号公報等がある。
この先行技術においては、薄膜磁気ヘッドのバイアス電
位と媒体の電位とを等しくして放電を生じさせないよう
にして亜る。The charges accumulated in the capacitor are discharged by the discharge caused by the contact between the pole portion and the medium, and the potential of the magnetic film fluctuates. Common mode noise is generated due to the potential fluctuation of the magnetic film, which causes an error in the read data. Prior art documents relating to such discharge prevention technology include, for example, Japanese Patent Laid-Open No. 2-246048.
In this prior art, the bias potential of the thin film magnetic head and the potential of the medium are made equal to each other so that no discharge is generated.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上述し
た先行技術では、薄膜磁気ヘッドのバイアス電位と媒体
の電位とを等しくするために、回転する媒体に薄膜磁気
ヘッドと同電位にする手段を設けることが必須になるの
で、磁気ディスク装置の構造が複雑となり、大型化を招
くと共に、高価になる。However, in the above-mentioned prior art, in order to equalize the bias potential of the thin-film magnetic head and the potential of the medium, the rotating medium is provided with a means for making the same potential as the thin-film magnetic head. Is essential, the structure of the magnetic disk device becomes complicated, the size is increased, and the cost is increased.
【０００６】そこで本発明の課題は、上述する従来の問
題点を解決し、薄膜磁気回路に対する磁気的悪影響を小
さくして、キャパシタンス蓄積電荷に起因する放電を確
実に防止し得るようにした薄膜磁気ヘッドを提供するこ
とである。Therefore, an object of the present invention is to solve the above-mentioned conventional problems, reduce the magnetic adverse effect on the thin film magnetic circuit, and surely prevent the discharge caused by the charge accumulated in the capacitance. Is to provide a head.
【０００７】[0007]
【課題を解決するための手段】上述した課題解決のた
め、本発明は、スライダと、薄膜磁気変換素子とを有す
る薄膜磁気ヘッドであって、前記スライダは、その大部
分を構成する導電性基体と、前記導電性基体の表面に設
けられた絶縁膜とを有しており、前記薄膜磁気変換素子
は、磁性膜とコイル膜とを含み、前記絶縁膜の上に設け
られ、前記磁性膜の少なくとも一部が前記絶縁膜に設け
られた孔を通して前記導電性基体上に直接に形成されて
いることを特徴とする。In order to solve the above-mentioned problems, the present invention is a thin film magnetic head having a slider and a thin film magnetic conversion element, wherein the slider is a conductive substrate that constitutes the majority thereof. And an insulating film provided on the surface of the conductive substrate, the thin film magnetic conversion element includes a magnetic film and a coil film, and is provided on the insulating film. At least a part thereof is directly formed on the conductive substrate through a hole provided in the insulating film.
【０００８】[0008]
【作用】薄膜磁気変換素子は、磁性膜の少なくとも一部
が、スイライダの絶縁膜に設けられた孔を通して、導電
性基体上に直接に形成されているから、磁性膜がアース
電位となる導電性基体と同電位に保たれる。このため、
コイル膜と磁性層との間に発生するキャパシタに電荷が
蓄積されても、蓄積電荷に起因して磁性膜のポ−ル部と
媒体との間に放電を発生することはない。しかも、薄膜
磁気回路に対する磁気的な悪影響を生じる余地がない。In the thin-film magnetic conversion element, at least a part of the magnetic film is directly formed on the conductive substrate through the hole formed in the insulating film of the swider, so that the magnetic film has a conductive property such that it is at ground potential. It is kept at the same potential as the substrate. For this reason,
Even if electric charges are accumulated in the capacitor generated between the coil film and the magnetic layer, the accumulated electric charges do not cause discharge between the pole portion of the magnetic film and the medium. Moreover, there is no room for magnetically adversely affecting the thin film magnetic circuit.
【０００９】スライダは導電性基体の表面に設けられた
絶縁膜を有しており、薄膜磁気変換素子は絶縁膜の上に
設けられ、磁性膜は絶縁膜に設けられた孔を通して導電
性基体上に形成されているから、薄膜磁気変換素子のコ
イル膜、そのリード電極及び取出電極と、導電性基体と
の間で絶縁膜による充分な電気絶縁を確保できる。The slider has an insulating film provided on the surface of the conductive substrate, the thin film magnetic conversion element is provided on the insulating film, and the magnetic film is provided on the conductive substrate through a hole provided in the insulating film. Therefore, sufficient electrical insulation can be secured between the coil film of the thin film magnetic conversion element, its lead electrode and extraction electrode, and the conductive substrate by the insulating film.
【００１０】[0010]
【実施例】図１は本発明に係る薄膜磁気ヘッドの薄膜磁
気変換素子の部分の拡大断面図である。図は構造の概略
を示すために用いられているもので、各部寸法は誇張さ
れている。図において、１はスライダ、２は薄膜磁気変
換素子である。1 is an enlarged sectional view of a thin film magnetic conversion element of a thin film magnetic head according to the present invention. The figure is used to show the outline of the structure, and the dimensions of each part are exaggerated. In the figure, 1 is a slider and 2 is a thin film magnetic conversion element.
【００１１】スライダ１は、その大部分を構成する例え
ばAl2O3-Tic 等の導電性基体１１と、導電性基体１１の
表面に設けられたアルミナ等の絶縁膜１２とを有してい
る。薄膜磁気変換素子２は、下部磁性膜２１と、上部磁
性膜２２と、コイル膜２３とを有し、下部磁性膜２１が
絶縁膜１２に設けられた孔１２１を通して導電性基体１
１上に直接に形成されている。下部磁性膜２１及び上部
磁性膜２２は、通常、パーマロイ等で構成され、先端部
が変換ギャップを構成するポ−ル部２１１、２２１とな
っていて、ポ−ル部２１１、２２１に連なるヨ−ク部２
１２、２２２の後方側２１３、２２３が磁気回路を完成
するように結合されている。ポール部２１１、２２１は
アルミナ等でなるギャップ膜２４により隔てられてい
る。下部磁性膜２１は、ヨーク部２１２の大部分が絶縁
膜１２に設けられた孔１２１を通して導電性基体１１上
に形成され、ポール部２１１が先端部に残る絶縁膜１２
２によって支持されている。ヨーク部２１２の表面は、
ポール部２１１の表面から段差をもって落ち込んでい
る。The slider 1 has a conductive base 11 such as Al 2 O 3 -Tic, which constitutes most of the slider 1, and an insulating film 12 such as alumina provided on the surface of the conductive base 11. .. The thin-film magnetic conversion element 2 has a lower magnetic film 21, an upper magnetic film 22, and a coil film 23, and the lower magnetic film 21 passes through a hole 121 provided in the insulating film 12 to form the conductive substrate 1.
It is formed directly on the 1. The lower magnetic film 21 and the upper magnetic film 22 are usually made of permalloy or the like, and the tip portions thereof are the pole portions 211 and 221 constituting the conversion gap, and the yaw connecting to the pole portions 211 and 221. Part 2
The rear sides 213, 223 of 12, 222 are joined to complete the magnetic circuit. The pole portions 211 and 221 are separated by a gap film 24 made of alumina or the like. The lower magnetic film 21 is formed on the conductive substrate 11 through the holes 121 formed in the insulating film 12 in most of the yoke part 212, and the pole part 211 remains at the tip part of the insulating film 12.
Supported by 2. The surface of the yoke portion 212 is
It falls from the surface of the pole portion 211 with a step.
【００１２】コイル膜２３は、ヨーク部２１２ー２２２
間に形成される間隔内を通りヨーク部２１２、２２２の
結合部の周りを渦巻状にまわるように配置され、有機絶
縁膜２５１〜２５３によって支持されている。有機絶縁
膜２５１〜２５３は、通常、ノボラック樹脂等の有機樹
脂で構成される。２６はアルミナ等でなる保護膜であ
る。The coil film 23 has yoke portions 212-222.
The organic insulating films 251 to 253 are arranged so as to spirally wind around the joints of the yoke portions 212 and 222 passing through the space formed therebetween. The organic insulating films 251 to 253 are usually made of organic resin such as novolac resin. Reference numeral 26 is a protective film made of alumina or the like.
【００１３】上述のように、薄膜磁気変換素子２は、下
部磁性膜２１が絶縁膜１２に設けられた孔１２１を通し
て導電性基体１１上に直接に形成されているから、下部
磁性膜２１及び上部磁性膜２２がアース電位となる導電
性基体１１と同電位に保たれる。このため、コイル膜２
３と下部磁性層２１及び上部磁性膜２２との間に発生す
るキャパシタに電荷が蓄積されても、蓄積電荷に起因し
て磁性膜２１、２２のポ−ル部２１１、２２１と媒体
（図示しない）との間に放電を発生することはない。し
かも、薄膜磁気回路に対する磁気的な悪影響を生じる余
地がない。As described above, in the thin-film magnetic conversion element 2, since the lower magnetic film 21 is directly formed on the conductive substrate 11 through the hole 121 provided in the insulating film 12, the lower magnetic film 21 and the upper part are formed. The magnetic film 22 is kept at the same potential as the conductive substrate 11 which is at the ground potential. Therefore, the coil film 2
3 is stored in the capacitor generated between the lower magnetic layer 21 and the upper magnetic film 22, the stored electric charges cause the pole portions 211 and 221 of the magnetic films 21 and 22 and the medium (not shown). ) And discharge does not occur. Moreover, there is no room for magnetically adversely affecting the thin film magnetic circuit.
【００１４】また、薄膜磁気変換素子１２は絶縁膜１２
の上に設けられているから、薄膜磁気変換素子２のコイ
ル膜２３は、有機絶縁膜２５１〜２５３による電気絶縁
の他に、絶縁膜１２による電気絶縁も受ける。The thin film magnetic conversion element 12 is an insulating film 12.
Since the coil film 23 of the thin-film magnetic conversion element 2 is provided on the above, the coil film 23 of the thin film magnetic conversion element 2 receives not only the electric insulation by the organic insulating films 251 to 253 but also the electric insulation by the insulating film 12.
【００１５】図２は本発明に係る薄膜磁気ヘッドの薄膜
磁気変換素子部分の拡大断面図である。図において、図
１と同一の参照符号は同一性ある構成部分を示してい
る。この実施例では、下部磁性膜２１は、絶縁膜１２に
設けられた孔１２１を通して導電性基体１１上に直接に
形成され、ヨーク部２１２の表面とポール部２１１の表
面が実質的に同一の平面を形成している。FIG. 2 is an enlarged sectional view of the thin film magnetic conversion element portion of the thin film magnetic head according to the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same components. In this embodiment, the lower magnetic film 21 is directly formed on the conductive substrate 11 through the hole 121 formed in the insulating film 12, and the surface of the yoke portion 212 and the surface of the pole portion 211 are substantially the same plane. Is formed.
【００１６】本発明に係る薄膜磁気ヘッドにおいて、ス
ライダ１は種々の構造をとることができる。その例を図
３及び図４に示す。図３では、スライダ１は、媒体対向
面側に２つのレール１０１、１０２を有しており、レー
ル１０１、１０２の表面が空気ベアリング面１０３、１
０４として利用される。２７、２８はコイル膜２３に導
通する取出電極、２７１、２８１はリード電極である。
これらは、スライダ１を構成する絶縁膜１２の上に設け
られている。従って、取出電極２７、２８及びリード電
極２７１、２８１と、導電性基体１１との間で絶縁膜１
２による充分な電気絶縁を確保できる。In the thin film magnetic head according to the present invention, the slider 1 can have various structures. Examples thereof are shown in FIGS. 3 and 4. In FIG. 3, the slider 1 has two rails 101 and 102 on the medium facing surface side, and the surfaces of the rails 101 and 102 are air bearing surfaces 103 and 1, respectively.
It is used as 04. 27 and 28 are extraction electrodes that are electrically connected to the coil film 23, and 271 and 281 are lead electrodes.
These are provided on the insulating film 12 forming the slider 1. Therefore, the insulating film 1 is formed between the extraction electrodes 27, 28 and the lead electrodes 271, 281 and the conductive substrate 11.
2 can ensure sufficient electric insulation.
【００１７】図４では、スライダ１は媒体対向面がレー
ル部を持たない平面状の空気ベアリング面１０５となっ
ている。取出電極２７、２８及びリード電極２７１、２
８１は絶縁膜１２の上に設けられており、導電性基体１
１との間で絶縁膜１２による充分な電気絶縁を確保でき
る。In FIG. 4, the slider 1 has a flat air bearing surface 105 having no rail portion at the medium facing surface. Extraction electrodes 27, 28 and lead electrodes 271, 2
81 is provided on the insulating film 12, and the conductive substrate 1
It is possible to secure sufficient electrical insulation between the first and second insulating films 12.
【００１８】実施例では、面内記録再生用の薄膜磁気ヘ
ッドを示したが、垂直記録再生用の薄膜磁気ヘッドにも
同様に適用が可能である。In the embodiment, the thin film magnetic head for in-plane recording / reproducing is shown, but the invention can be similarly applied to the thin film magnetic head for perpendicular recording / reproducing.
【００１９】[0019]
【発明の効果】以上述べたように、本発明によれば、次
のような効果が得られる。 （ａ）薄膜磁気変換素子は、磁性膜の少なくとも一部
が、スイライダの絶縁膜に設けられた孔を通して、導電
性基体上に直接に形成されているから、キャパシタへの
電荷蓄積に起因する磁性膜のポ−ル部と媒体との間の放
電、及び、放電による読み取りデ−タ・エラ−を発生す
ることのない薄膜磁気ヘッドを提供できる。 （ｂ）放電防止構造が薄膜磁気回路に対して磁気的な悪
影響を与える余地のない薄膜磁気ヘッドを提供できる。 （ｃ）スライダは導電性基体の表面に設けられた絶縁膜
を有しており、薄膜磁気変換素子は絶縁膜の上に設けら
れ、磁性膜は絶縁膜に設けられた孔を通して導電性基体
上に形成されているから、薄膜磁気変換素子のコイル
膜、そのリード電極及び取出電極と、導電性基体との間
で絶縁膜による充分な電気絶縁を確保し得る薄膜磁気ヘ
ッドを提供できる。As described above, according to the present invention, the following effects can be obtained. (A) In the thin-film magnetic conversion element, at least a part of the magnetic film is directly formed on the conductive substrate through the hole provided in the insulating film of the swider, so that the magnetic property caused by the charge accumulation in the capacitor is reduced. It is possible to provide a thin film magnetic head which does not generate a discharge between the pole portion of the film and the medium and a read data error due to the discharge. (B) It is possible to provide a thin film magnetic head in which there is no room for the discharge prevention structure to adversely affect the thin film magnetic circuit. (C) The slider has an insulating film provided on the surface of the conductive substrate, the thin film magnetic conversion element is provided on the insulating film, and the magnetic film is provided on the conductive substrate through a hole provided in the insulating film. Thus, it is possible to provide a thin film magnetic head capable of ensuring sufficient electrical insulation between the coil film of the thin film magnetic conversion element, its lead electrodes and extraction electrodes, and the conductive substrate by the insulating film.
【図１】本発明に係る薄膜磁気ヘッドの薄膜磁気変換素
子部分の拡大断面図である。FIG. 1 is an enlarged cross-sectional view of a thin film magnetic conversion element portion of a thin film magnetic head according to the present invention.
【図２】本発明に係る薄膜磁気ヘッドの別の実施例にお
ける薄膜磁気変換素子部分の拡大断面図である。FIG. 2 is an enlarged cross-sectional view of a thin film magnetic conversion element portion in another embodiment of the thin film magnetic head according to the present invention.
【図３】本発明に係る薄膜磁気ヘッドの外観斜視図であ
る。FIG. 3 is an external perspective view of a thin film magnetic head according to the present invention.
【図４】本発明に係る薄膜磁気ヘッドの別の実施例にお
ける外観斜視図である。FIG. 4 is an external perspective view of another embodiment of the thin film magnetic head according to the present invention.
１ 基体 １１ 導電性基体 １２ 絶縁膜 １２１ 孔 ２ 薄膜磁気変換素子 ２１ 下部磁性膜 ２２ 上部磁性膜 ２３ コイル膜 1 Substrate 11 Conductive Substrate 12 Insulating Film 121 Hole 2 Thin Film Magnetic Conversion Element 21 Lower Magnetic Film 22 Upper Magnetic Film 23 Coil Film
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年７月２５日[Submission date] July 25, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】０００３[Name of item to be corrected] 0003
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【０００３】一方、最近の小型ＨＤＤでは、パソコン搭
載を考慮してパソコン電源である５ボルト、１２ボルト
をそのまま利用すべく、小型ＨＤＤ用の読み書き用ＩＣ
も５ボルトの片電源を用いるようになっている。このた
め、薄膜磁気ヘッドは一定電圧、具体的には、２．５ボ
ルトの正電圧で常時バイアスされる。その結果、キャパ
シタはバイアス電圧により常時一方向に電荷が蓄積され
る。On the other hand, in the recent compact HDD, a read / write IC for the compact HDD is used so that the personal computer power supply of 5 volt or 12 volt can be used as it is in consideration of mounting on a personal computer.
Also uses a single 5 volt power supply. Therefore, the thin film magnetic head is constantly biased with a constant voltage, specifically, a positive voltage of 2.5 volts. As a result, the capacitor always accumulates charges in one direction due to the bias voltage.
Claims (4)
る薄膜磁気ヘッドであって、 前記スライダは、その大部分を構成する導電性基体と、
前記導電性基体の表面に設けられた絶縁膜とを有してお
り、 前記薄膜磁気変換素子は、磁性膜とコイル膜とを含み、
前記絶縁膜の上に設けられ、前記磁性膜の少なくとも一
部が前記絶縁膜に設けられた孔を通して前記導電性基体
上に直接に形成されていることを特徴とする薄膜磁気ヘ
ッド。1. A thin film magnetic head having a slider and a thin film magnetic conversion element, wherein the slider comprises a conductive base constituting a majority of the slider.
An insulating film provided on the surface of the conductive substrate, the thin film magnetic conversion element includes a magnetic film and a coil film,
A thin-film magnetic head provided on the insulating film, wherein at least a part of the magnetic film is directly formed on the conductive substrate through a hole provided in the insulating film.
とを含み、 前記下部磁性膜及び上部磁性膜は、先端部に変換ギャッ
プを構成するポール部を有すると共に、前記ポール部に
連なるヨーク部を有し、前記ヨーク部が互いに間隔を隔
てて対向し後方で互いに結合されており、 前記下部磁性膜は、前記ヨーク部の大部分が前記孔を通
して前記導電性基体上に形成され、前記ポール部が前記
絶縁膜によって支持されてており、 前記コイル膜は、前記ヨーク部間に形成される前記間隔
内を通り前記ヨーク部の結合部の周りを渦巻状にまわる
ように配置され、有機絶縁膜によって支持されているこ
とを特徴とする請求項１に記載の薄膜磁気ヘッド。2. The magnetic film includes a lower magnetic film and an upper magnetic film, and each of the lower magnetic film and the upper magnetic film has a pole portion forming a conversion gap at a tip thereof and is continuous with the pole portion. A yoke portion, the yoke portions are opposed to each other with a space therebetween, and are coupled to each other in the rear, and in the lower magnetic film, most of the yoke portion is formed on the conductive substrate through the holes, The pole portion is supported by the insulating film, the coil film is arranged so as to spirally wind around the coupling portion of the yoke portion, passing through the space formed between the yoke portions, The thin film magnetic head according to claim 1, wherein the thin film magnetic head is supported by an organic insulating film.
が前記ポール部の表面から段差をもって落ち込んでいる
ことを特徴とする請求項２に記載の薄膜磁気ヘッド。3. The thin film magnetic head according to claim 2, wherein in the lower magnetic film, the surface of the yoke portion is stepped down from the surface of the pole portion.
と前記ポール部の表面が実質的に同一の平面を形成して
いることを特徴とする請求項２に記載の薄膜磁気ヘッ
ド。4. The thin-film magnetic head according to claim 2, wherein in the lower magnetic film, the surface of the yoke portion and the surface of the pole portion form substantially the same plane.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22842091A JPH0546929A (en) | 1991-08-13 | 1991-08-13 | Thin film magnetic head |
| US08/259,154 US6166880A (en) | 1991-08-13 | 1994-06-13 | Thin film magnetic head which prevents errors due to electric discharge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22842091A JPH0546929A (en) | 1991-08-13 | 1991-08-13 | Thin film magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0546929A true JPH0546929A (en) | 1993-02-26 |
Family
ID=16876197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22842091A Pending JPH0546929A (en) | 1991-08-13 | 1991-08-13 | Thin film magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0546929A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06207280A (en) * | 1992-07-21 | 1994-07-26 | Seagate Technol Internatl | Thin film magnetic head and its preparation |
| US7292408B2 (en) | 2004-07-30 | 2007-11-06 | Hitachi Global Storage Technologies Netherlands B.V. | Bilayer coil insulation for magnetic write heads to minimize pole recession |
| US7436633B2 (en) | 2004-10-15 | 2008-10-14 | Tdk Corporation | Thin-film magnetic head, head gimbal assembly and hard disk system |
| US9284209B2 (en) | 2007-05-18 | 2016-03-15 | Corning Incorporated | Method and apparatus for minimizing inclusions in a glass making process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58161126A (en) * | 1982-03-19 | 1983-09-24 | Sanyo Electric Co Ltd | Thin film magnetic head |
| JPH03104009A (en) * | 1989-09-18 | 1991-05-01 | Fujitsu Ltd | Thin film magnetic head |
-
1991
- 1991-08-13 JP JP22842091A patent/JPH0546929A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58161126A (en) * | 1982-03-19 | 1983-09-24 | Sanyo Electric Co Ltd | Thin film magnetic head |
| JPH03104009A (en) * | 1989-09-18 | 1991-05-01 | Fujitsu Ltd | Thin film magnetic head |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06207280A (en) * | 1992-07-21 | 1994-07-26 | Seagate Technol Internatl | Thin film magnetic head and its preparation |
| US7292408B2 (en) | 2004-07-30 | 2007-11-06 | Hitachi Global Storage Technologies Netherlands B.V. | Bilayer coil insulation for magnetic write heads to minimize pole recession |
| US7436633B2 (en) | 2004-10-15 | 2008-10-14 | Tdk Corporation | Thin-film magnetic head, head gimbal assembly and hard disk system |
| US9284209B2 (en) | 2007-05-18 | 2016-03-15 | Corning Incorporated | Method and apparatus for minimizing inclusions in a glass making process |
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| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19951128 |