JPH01118207A - Thin film magnetic head - Google Patents

Thin film magnetic head

Info

Publication number
JPH01118207A
JPH01118207A JP27598987A JP27598987A JPH01118207A JP H01118207 A JPH01118207 A JP H01118207A JP 27598987 A JP27598987 A JP 27598987A JP 27598987 A JP27598987 A JP 27598987A JP H01118207 A JPH01118207 A JP H01118207A
Authority
JP
Japan
Prior art keywords
coil
thin film
ferrite core
substrate
groove
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
Application number
JP27598987A
Other languages
Japanese (ja)
Inventor
Kazunori Narita
成田 万紀
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.)
Renesas Semiconductor Manufacturing Co Ltd
Kansai Nippon Electric Co Ltd
Original Assignee
Renesas Semiconductor Manufacturing Co Ltd
Kansai Nippon Electric Co Ltd
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 Renesas Semiconductor Manufacturing Co Ltd, Kansai Nippon Electric Co Ltd filed Critical Renesas Semiconductor Manufacturing Co Ltd
Priority to JP27598987A priority Critical patent/JPH01118207A/en
Publication of JPH01118207A publication Critical patent/JPH01118207A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To set the thickness of a coil in spite of magnetic gap length and to eliminate limitation with respect to a pitch between heads and to increase the number of windings by forming a thin film conductor coil on a ferrite core substrate of high permeability, and adhering a ferrite core block of high permeability on the upper part of the coil. CONSTITUTION:A groove for coil having the same thickness as that of a thin film coil 2 and a size a little larger than that of the coil 2 is formed on the plane of the ferrite core substrate 1 of high permeability of a thin film magnetic head. Next, a thin film coil material is formed on the entire plane of the substrate 1 by a sputtering method, etc., and by patterning the coil material in prescribed shape, a thin film coil 2 is formed. Next, the groove for glass is formed at a part of the ferrite core block 5, and an insulating glass layer 6 is formed by pouring a glass material into the groove, and an alumina film 3 is formed on the lower plane of the block 5. Finally, the substrate 1 is adhered by epoxy resin 4.

Description

【発明の詳細な説明】 この1 本発明は磁気記録・再生兼用が可能な薄膜磁気へノドに
関するものである。
DETAILED DESCRIPTION OF THE INVENTION (1) The present invention relates to a thin film magnetic nodule that can be used for both magnetic recording and reproduction.

従」辷0」j阻 一般に、微細ピッチで多数トラックの磁気記録、たとえ
ばピッチ= OJ4mm、  トランク数=18゜で用
いられる磁気ヘッドとしてVTR等に用いられているバ
ルクヘッドを多数組合わせて構成することは、巻線寸法
の制限及び各トラック間の18m以下の位置合わせの困
難さなどの理由により、非常に困難である。そこでこの
様な磁気ヘッドとしては、通常−枚のコア基板上にフォ
トリングラフィ技術により薄膜コイルを形成する。薄膜
磁気ヘッドが採用されている。
In general, a magnetic head used for magnetic recording with a large number of tracks at a fine pitch, for example, pitch = OJ 4 mm, number of trunks = 18°, is constructed by combining a large number of bulk heads used in VTRs, etc. This is extremely difficult due to the limitations of the winding dimensions and the difficulty of positioning the tracks within 18 m. Therefore, in such a magnetic head, a thin film coil is usually formed on a single core substrate by photolithography technology. A thin film magnetic head is used.

その薄膜磁気ヘッドの一例を第4図に示す。An example of the thin film magnetic head is shown in FIG.

第4図は薄膜磁気ヘッドの主要部分を示す断面図であっ
て、1はフェライト基板、2は薄膜コイル、3は磁気ギ
ャップを形成するためのアルミナ膜、4はアルミナ膜3
およびコイル2とフェライトブロック5を接着するため
のエポキシ樹脂、6はフェライトブロックの各トラック
の磁気絶縁用ガラス層、7は磁気記録媒体たとえば、磁
気テープ、磁気ディスク等である。
FIG. 4 is a sectional view showing the main parts of a thin film magnetic head, in which 1 is a ferrite substrate, 2 is a thin film coil, 3 is an alumina film for forming a magnetic gap, and 4 is an alumina film 3.
and an epoxy resin for bonding the coil 2 and the ferrite block 5; 6 is a magnetically insulating glass layer for each track of the ferrite block; 7 is a magnetic recording medium such as a magnetic tape, a magnetic disk, etc.

−Bが  よ゛  、、l占 第4図に示す従来例においては、磁気ギャップ長は、薄
膜コイル2の厚さとエポキシ樹脂4の厚さを加えたもの
に等しい。したがって薄膜コイル2の厚さは少なくとも
磁気ギャップ長より小さくなければならない。ところが
、薄膜コイル2の電気抵抗は電流による発熱をさけるた
め一般に低い方か望ましいことはいうまでもない。しか
るに、多数のヘッド間のピンチが小さくなるに従い、又
、磁束密度を上げるためにコイルのターン数が多くなる
に従い幾何学的な制限により薄膜コイル2の巾は小さく
なり、そのため薄膜コイル2の電気抵抗は増加せざるを
得ない。これを解決するためには薄膜コイル2の厚さを
厚くするほかないわけであるが、第4図に示す従来例に
おいては前述のおとり厚さは磁気ギャップ長により制限
をうける。このため従来例によればヘッド間ピッチおよ
びコイルのターン数に大巾な制限が加わる、高密度磁気
記録は実現できない。
In the conventional example shown in FIG. 4, the magnetic gap length is equal to the sum of the thickness of the thin film coil 2 and the thickness of the epoxy resin 4. Therefore, the thickness of the thin film coil 2 must be at least smaller than the magnetic gap length. However, it goes without saying that it is generally desirable that the electrical resistance of the thin film coil 2 be low in order to avoid heat generation due to current. However, as the pinch between multiple heads becomes smaller, and as the number of turns in the coil increases to increase the magnetic flux density, the width of the thin film coil 2 becomes smaller due to geometrical restrictions, and as a result, the width of the thin film coil 2 becomes smaller. Resistance is bound to increase. In order to solve this problem, there is no choice but to increase the thickness of the thin film coil 2, but in the conventional example shown in FIG. 4, the above-mentioned decoy thickness is limited by the magnetic gap length. For this reason, according to the conventional example, high-density magnetic recording cannot be realized since the pitch between heads and the number of turns of the coil are severely limited.

。            た  の 1肪記の問題点を解決するために本発明の薄膜磁気ヘッ
ドは、高透磁率のフェライトコア基板上にフォトリング
ラフィ技術により薄膜導体コイルを形成し、更にその上
部に高透磁率のフェライトコアブロックを接着させるこ
とにより、フェライトコア基板とフェライトコアブロッ
クにより磁気コアを構成した薄膜磁気ヘッドにおいて、
フェライトコア基板上の薄膜コイル形成箇所に薄膜コイ
ルの厚さにほぼ等しい凹溝を形成し、その溝の中に薄膜
コイルを形成するものである。
. In order to solve the above problems, the thin film magnetic head of the present invention has a thin film conductor coil formed on a high magnetic permeability ferrite core substrate by photolithography technology, and a high magnetic permeability layer on top of the thin film conductor coil. By bonding ferrite core blocks, a thin film magnetic head in which a magnetic core is constructed from a ferrite core substrate and a ferrite core block,
A groove approximately equal to the thickness of the thin film coil is formed at the thin film coil formation location on the ferrite core substrate, and the thin film coil is formed in the groove.

1皿 本発明によれば、フィル厚さが磁気ギャップ長と関係な
く設定できるため、トラックピッチか狭くなり、コイル
のターン数が増加しても、コイルの厚さを厚くすること
によりコイルの電気抵抗を所望の低い値にできる。よっ
て、書込み電流による磁気ヘッドの過熱を防ぎまた、書
込み及び読出しのアンプの低いインピーダンスに十分整
合させることができる。
According to the present invention, the fill thickness can be set independently of the magnetic gap length, so even if the track pitch becomes narrower and the number of turns of the coil increases, the electric current of the coil can be reduced by increasing the thickness of the coil. The resistance can be set to a desired low value. Therefore, it is possible to prevent overheating of the magnetic head due to the write current and to sufficiently match the low impedance of the write and read amplifiers.

また、コイルは溝内に形成されるので、フェライトコア
ブロックを接合する場合に接合面が平坦化し易くなる。
Furthermore, since the coil is formed in the groove, the joining surface can be easily flattened when joining the ferrite core blocks.

実」範例− 以下、本発明の実施例について図面を参照して説明する
。第1図は本発明にかかる薄膜磁気ヘッドの構成例の主
要部分の断面図である。第1図において1はフェライト
コア基板、2は薄膜コイル、3は磁気ギャップを形成す
るためのアルミナ膜、4はアルミナ膜3とフェライトコ
ア基板1および薄膜コイル2を接着するためのエポキシ
樹脂、5はフェライトブロック、6はフェライトブロッ
ク内にあって、各トラックを絶縁分離するためのガラス
層、7は磁気記録媒体である。
EMBODIMENT OF THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the main parts of a configuration example of a thin film magnetic head according to the present invention. In FIG. 1, 1 is a ferrite core substrate, 2 is a thin film coil, 3 is an alumina film for forming a magnetic gap, 4 is an epoxy resin for bonding the alumina film 3, the ferrite core substrate 1, and the thin film coil 2, 5 6 is a ferrite block, 6 is a glass layer for insulating and separating each track, and 7 is a magnetic recording medium.

本発明の実施例では第4図の従来例で見られる問題点、
すなわち薄膜コイル2の厚さが磁気ギャップ長以下に制
限されるということを防止するために、フェライト基板
1に、薄膜コイル2の厚さと同等の溝を形成している。
In the embodiment of the present invention, the problems seen in the conventional example shown in FIG.
That is, in order to prevent the thickness of the thin film coil 2 from being limited to less than the magnetic gap length, a groove having the same thickness as the thin film coil 2 is formed in the ferrite substrate 1.

これにより、薄膜コイル2の厚さは磁気ギャップ長とは
無関係に大きくできて、所望の低い抵抗値の薄膜コイル
2を実現できる。
Thereby, the thickness of the thin film coil 2 can be increased regardless of the magnetic gap length, and the thin film coil 2 with a desired low resistance value can be realized.

次に本発明の薄膜磁気ヘッドの製造法について、第2図
を用いて説明する。まず第2図(a)のごとく、フェラ
イトコア基板1の面上に、後工程で薄膜コイル2が形成
できる大きさおよび深さでコイル用の溝8を広く知られ
ているフォトリングラフィ法およびフェライトのエツチ
ング法により形成する。溝8の大きさは、薄膜コイル2
よりい(らか大きめとし、深さは同等とするのが適当で
ある。次に第2図(b)のごとく、フェライト基板1の
上面の全面にわたりスパッタリング法・蒸着法などによ
り薄膜コイル材料9たとえば金・銅などを形成する。薄
膜コイル材料9の厚さはのちに薄膜コイル2になったと
きに必要な厚さとし、また、コイル用溝8の深さと同じ
とする。次に第3図(C)に示すように、よく知られた
フォトリングラフィ法及び、エツチング法を用いて、薄
膜コイル材料9を、所望のコイル形状にパターンニング
し、薄膜コイル2を形成する。以上でフェライトコア基
板側の製造工程は完了するので、次にフェライトコアブ
ロック側の製造工程について説明する。まず第3図(a
)のごとく、フェライトコアブロック5の一部に、ダイ
サー、スライサーなどを用いてガラス用溝lOを形成す
る。次に第3図(b)のごとく、真空加熱炉等を用いて
、ガラス材をガラス用溝lOに流し込み、ブロゾク内、
絶縁ガラス層6を形成する。次に第3図(C)のように
、ブロフク5の下面に、スバタリング法、蒸若法などを
用いて、アルミナ膜3を形成する。アルミナ膜3の厚さ
は、のちに接着剤であるエポキシ樹脂4の厚さと合計し
て、所望の磁気ギャップ長になるような厚さを選ぶ。第
3図(C)で、フェライトブロック部分の製造工程は完
了し、これと第2図(C)に示したフェライト基板をエ
ポキシ樹脂4により接首することにより第1図に示した
本発明の薄膜磁気ヘッド完成品を得ることができる。
Next, a method for manufacturing the thin film magnetic head of the present invention will be explained with reference to FIG. First, as shown in FIG. 2(a), a groove 8 for a coil is formed on the surface of a ferrite core substrate 1 by the widely known photolithography method to a size and depth that allows the thin film coil 2 to be formed in a later process. Formed by ferrite etching method. The size of the groove 8 is the same as that of the thin film coil 2.
It is appropriate to make the coil material 9 larger and have the same depth. Next, as shown in FIG. For example, gold, copper, etc. are formed.The thickness of the thin film coil material 9 is set to be the thickness required for forming the thin film coil 2 later, and is the same as the depth of the coil groove 8.Next, FIG. As shown in (C), the thin film coil material 9 is patterned into a desired coil shape using the well-known photolithography method and etching method to form the thin film coil 2. Now that the manufacturing process on the substrate side has been completed, we will next explain the manufacturing process on the ferrite core block side.First, Figure 3 (a)
), a glass groove lO is formed in a part of the ferrite core block 5 using a dicer, a slicer, etc. Next, as shown in FIG. 3(b), using a vacuum heating furnace or the like, pour the glass material into the glass groove lO,
An insulating glass layer 6 is formed. Next, as shown in FIG. 3(C), an alumina film 3 is formed on the lower surface of the block 5 using a sputtering method, a steaming method, or the like. The thickness of the alumina film 3 is selected so that the desired magnetic gap length is obtained by adding up the thickness of the epoxy resin 4 which is an adhesive later. In FIG. 3(C), the manufacturing process of the ferrite block part is completed, and by connecting this and the ferrite substrate shown in FIG. 2(C) with epoxy resin 4, the present invention shown in FIG. A completed thin film magnetic head can be obtained.

発訓Fと熟未− 以上の説明から明らかなように、本発明の薄膜磁気ヘッ
ドは、薄膜コイルの厚さを、磁気ギャップ長の制限を受
けることな(、自由に厚(することができるため、記録
の高密度化のためトラックピッチが狭くなり、コイルの
ターン数が増加してもコイルの電気抵抗を所望の低い値
にできる。これにより、書込み電流による磁気ヘッドの
過熱を防ぎ、また、書込み及び読出しのアンプからくる
低いインピーダンスの要求に答えられる高信頼性の磁気
ヘッドが実現できる。
Lesson F and Unrefined As is clear from the above explanation, the thin film magnetic head of the present invention allows the thickness of the thin film coil to be freely changed without being limited by the magnetic gap length. Therefore, even if the track pitch becomes narrower due to higher recording density and the number of coil turns increases, the electrical resistance of the coil can be kept at the desired low value.This prevents the magnetic head from overheating due to the write current, and , a highly reliable magnetic head that can meet the requirements for low impedance from write and read amplifiers can be realized.

また、コア基板側とコアブロック側とを接合する作業が
容易となり薄膜磁気ヘッドの製造歩留向上にも寄与でき
る。
Furthermore, the work of joining the core substrate side and the core block side becomes easier, which contributes to improving the manufacturing yield of thin-film magnetic heads.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例を示す、薄膜磁気ヘッド主要
部分の断面図、第2図、第3図は本発明の薄膜磁気ヘッ
ドの製造工程の一例を示す断面図、第4図は従来例を示
す断面図である。 1・・・フェライトコア基板、 2・・・薄膜コイル、 3・・・アルミナ膜、 4・・・エポキシ樹脂、 5・・・フェライトコアブロック、 6・・・絶縁ガラス層、 7・・・磁気記録媒体、 8・・・コイル用溝、 9・・・薄膜コイル材料、 IO・・・ガラス用溝。 一部 第 2 ( 第 3 図 第 4 図
FIG. 1 is a cross-sectional view of the main parts of a thin-film magnetic head showing an embodiment of the present invention, FIGS. 2 and 3 are cross-sectional views showing an example of the manufacturing process of the thin-film magnetic head of the present invention, and FIG. FIG. 2 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1... Ferrite core substrate, 2... Thin film coil, 3... Alumina film, 4... Epoxy resin, 5... Ferrite core block, 6... Insulating glass layer, 7... Magnetism Recording medium, 8... Coil groove, 9... Thin film coil material, IO... Glass groove. Part 2 (Fig. 3, Fig. 4)

Claims (1)

【特許請求の範囲】[Claims] 高透磁率のフェライトコア基板上に、フォトリソグラフ
ィ技術により薄膜導体コイルを形成し更にその上部に高
透磁率のフェライトコアブロックを接着させることによ
り、フェライト基板とフェライトブロックにて開磁気路
を形成した薄膜磁気ヘッドにおいて、フェライト基板上
の薄膜コイル形成箇所に薄膜コイルの厚さにほぼ等しい
凹溝を形成しその溝の中に薄膜コイルを形成したことを
特徴とする薄膜磁気ヘッド。
By forming a thin film conductor coil on a high magnetic permeability ferrite core substrate using photolithography technology and then bonding a high magnetic permeability ferrite core block on top of the coil, an open magnetic path was formed between the ferrite substrate and the ferrite block. 1. A thin film magnetic head, characterized in that a concave groove approximately equal to the thickness of the thin film coil is formed at a location on a ferrite substrate where the thin film coil is formed, and a thin film coil is formed in the groove.
JP27598987A 1987-10-30 1987-10-30 Thin film magnetic head Pending JPH01118207A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27598987A JPH01118207A (en) 1987-10-30 1987-10-30 Thin film magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27598987A JPH01118207A (en) 1987-10-30 1987-10-30 Thin film magnetic head

Publications (1)

Publication Number Publication Date
JPH01118207A true JPH01118207A (en) 1989-05-10

Family

ID=17563223

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27598987A Pending JPH01118207A (en) 1987-10-30 1987-10-30 Thin film magnetic head

Country Status (1)

Country Link
JP (1) JPH01118207A (en)

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