JPH0154766B2 - - Google Patents
Info
- Publication number
- JPH0154766B2 JPH0154766B2 JP56213249A JP21324981A JPH0154766B2 JP H0154766 B2 JPH0154766 B2 JP H0154766B2 JP 56213249 A JP56213249 A JP 56213249A JP 21324981 A JP21324981 A JP 21324981A JP H0154766 B2 JPH0154766 B2 JP H0154766B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- recording
- film
- head
- 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.)
- Expired
Links
- 230000035699 permeability Effects 0.000 claims description 16
- 230000004907 flux Effects 0.000 claims description 4
- 239000010408 film Substances 0.000 description 35
- 239000010409 thin film Substances 0.000 description 23
- 239000010410 layer Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000005415 magnetization Effects 0.000 description 4
- 229910000859 α-Fe Inorganic materials 0.000 description 4
- 229910018605 Ni—Zn Inorganic materials 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000889 permalloy Inorganic materials 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004886 head movement Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000004804 winding Methods 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】
本発明は高透磁率磁性膜を磁極とする磁気記録
再生ヘツドに関し、特に記録と再生とに係る磁極
が異なる磁気記録再生ヘツドに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing head using a high permeability magnetic film as a magnetic pole, and more particularly to a magnetic recording/reproducing head having different magnetic poles for recording and reproducing.
高密度磁気記録を行う為に、従来のNi―Zn等
の焼結フエライトを磁性コアに用いた磁気ヘツド
に代つてパーマロイその他の高透磁率磁性薄膜を
磁極とする磁気ヘツドが用いられてきている。媒
体についても、従来のFe2O3の針状結晶粉等の樹
脂結合材と共に塗布した媒体に代つてCo―Crそ
の他の合金磁性薄膜をスパツタ、或は蒸着、メツ
キにより基板上に形成したものが用いられる様に
なつてきつつある。これらヘツドと媒体の組み合
せによる磁気記録装置に関して説明する。第１図
は、その一例で媒体１０１を挾んで両側にヘツド
が分離したものである。 In order to perform high-density magnetic recording, magnetic heads that use permalloy or other high permeability magnetic thin films as magnetic poles have been used instead of conventional magnetic heads that use sintered ferrite such as Ni-Zn for the magnetic core. . Regarding the medium, instead of the conventional medium coated with a resin binder such as Fe 2 O 3 acicular crystal powder, a magnetic thin film of Co-Cr or other alloy is formed on the substrate by sputtering, vapor deposition, or plating. is beginning to be used. A magnetic recording device using a combination of these heads and media will be explained. FIG. 1 shows an example in which heads are separated on both sides with a medium 101 in between.
第１図は記録トラツク方向の断面図であり、磁
気記録媒体１０１は、記録又は再生の過程で、ヘ
ツドに対し例えばタ印１０６の方向に移動する。
磁気ヘツドは１０２及び１０４より構成され、両
者は媒体１０１を挾む様にして対向している。１
０２の中心付近には、媒体１０１の面にほぼ垂直
になる様に高透磁率磁性薄膜（例えば１ミクロン
前後の厚みのパーマロイ膜）１０３が、基板１０
２上にメツキ又はスパツター等のプロセスで形成
され、サンドイツチされた構造をしている。１０
４は透磁率の比較的高い材料（例えばNi―Znフ
エライト等）で構成された磁性コアでありコア１
０４の周囲には、記録再生用コイル１０５が巻き
つけられている。記録時にはコイル１０５を流す
記録電流によつて生ずる磁界が矢印１０７の如く
媒体１０１を通過し、殊に磁性薄膜１０３と媒体
１０１との接触部分に磁界が集中する事によつて
その部分を磁化記録する。 FIG. 1 is a cross-sectional view in the recording track direction, and the magnetic recording medium 101 moves, for example, in the direction of the mark 106 with respect to the head during the recording or reproducing process.
The magnetic head consists of 102 and 104, which face each other so as to sandwich the medium 101 between them. 1
Near the center of the substrate 102, a high permeability magnetic thin film (for example, a permalloy film with a thickness of about 1 micron) 103 is placed almost perpendicularly to the surface of the medium 101.
2 by a process such as plating or sputtering, and has a sandwiched structure. 10
4 is a magnetic core made of a material with relatively high magnetic permeability (for example, Ni-Zn ferrite, etc.), and core 1
A recording/reproducing coil 105 is wound around the coil 04. During recording, a magnetic field generated by a recording current flowing through the coil 105 passes through the medium 101 as shown by an arrow 107, and the magnetic field concentrates on the contact area between the magnetic thin film 103 and the medium 101, thereby magnetizing and recording that area. do.
再生時には、同じく薄膜１０３が媒体１０１に
接触する部分の媒体上の記録磁化によつて薄膜１
０３とコア１０４の中に矢印１０７の如く発生す
る磁界の変化をコイル１０５が検出する。 At the time of reproduction, the thin film 101 is also
The coil 105 detects changes in the magnetic field generated between the core 104 and the magnetic field 104 as shown by an arrow 107.
ここで、第２図により、記録の際に、媒体面上
に生ずる記録磁界の分布を説明する。第２図Ａ
は、一般的なリング型ヘツドの場合についてであ
る（リングヘツドの構造の説明は略す。）。２０１
は磁性コア、２０２はコア間のギヤツプ部であ
る。２０３は媒体である。第２図Ａは、ヘツドと
媒体の断面図、同図Ｂは、平面図である。同図Ｂ
において、斜線部はヘツドが媒体に接触する領域
を示す。又、ｙ方向は、ヘツドに対する媒体の移
動方向を示し、ｘ方向は媒体の巾方向を示す。さ
らに、同図Ｃ，Ｄは媒体面上の記録磁界分布を示
す。即ち、Ｃに示す分布２０７は、媒体面上のｙ
方向の分布であり、Ｄに示す分布２０６は、媒体
面のｘ方向の分布である。又、２０８はヘツド２
０１の幅であり、２０９は実効記録トラツク幅で
あり、２１０は、消去幅である。ここで、実効記
録トラツク幅とは、再生に有効な記録磁化分布が
存在するトラツク幅である。消去幅とは、新たに
記録する前に記録されていた記録磁化分布が消さ
れるべきトラツク幅を示す。 Here, with reference to FIG. 2, the distribution of the recording magnetic field generated on the medium surface during recording will be explained. Figure 2A
The following is a case of a general ring head (explanation of the structure of the ring head is omitted). 201
202 is a magnetic core, and 202 is a gap between the cores. 203 is a medium. FIG. 2A is a sectional view of the head and medium, and FIG. 2B is a plan view. Figure B
In the figure, the shaded area indicates the area where the head contacts the medium. Further, the y direction indicates the direction of movement of the medium relative to the head, and the x direction indicates the width direction of the medium. Furthermore, C and D in the same figure show the recording magnetic field distribution on the medium surface. That is, the distribution 207 shown in C is y on the medium surface.
A distribution 206 shown in D is a distribution in the x direction of the medium surface. Also, 208 is head 2
01, 209 is the effective recording track width, and 210 is the erasing width. Here, the effective recording track width is a track width in which a recording magnetization distribution effective for reproduction exists. The erase width indicates the track width in which the recorded magnetization distribution should be erased before new recording.
次に、第３図は、磁性薄膜磁極による記録磁界
分布について示している。同図Ａ，Ｂ，Ｃ，Ｄ
は、第２図と同様に各々断面図、平面図、ｘ方向
の記録磁界分布、ｙ方向の記録磁界分布である。
ここで、第２図と第３図について、それぞれの実
用的な記録条件の元での磁界分布の差を説明す
る。 Next, FIG. 3 shows the recording magnetic field distribution due to the magnetic thin film pole. Same figure A, B, C, D
Similarly to FIG. 2, these are a cross-sectional view, a plan view, a recording magnetic field distribution in the x direction, and a recording magnetic field distribution in the y direction, respectively.
Here, with respect to FIG. 2 and FIG. 3, the difference in magnetic field distribution under each practical recording condition will be explained.
以下の説明は、磁界の数値解析によるシミユレ
ーシヨンによつて得られた結果であり、又実測デ
ータとの対応もよく得られているものである。 The following explanation is the result obtained by simulation based on numerical analysis of the magnetic field, and also corresponds well with actually measured data.
これらの傾向は一般に当該技術者間には周知の
事として説明するものである。第２図においてト
ラツク幅方向の分布２０７は比較的なだらかな勾
配を持ち、その結果、ヘツド幅２０８に対して実
効記録トラツク幅２０９はかなり広く、しかも消
去幅２１０は更に広くなる。通常のヘツドの場合
２０９は２０８に対し数ミクロン広く、２１０は
２０８に対し十〜二十ミクロン程度広い。これに
対し、第３図におけるトラツク幅方向の分布２１
６は、極めて急峻であり磁極２１１の幅２１７と
同等程度の実効記録幅２１８となる。トラツク方
向即ちｙ方向の分布は第２図と第３図の間では大
きな差はない２０６と２１５。次に、磁気記録再
生装置において、装置の機械的な誤差或は温度、
湿度等の影響によつて生ずる記録トラツク位置と
再生トラツク位置の変動について第４図に示す。
記録トラツク位置とは、磁気記録ヘツドによつて
媒体上に記録した磁化データの場所を言い、再生
トラツク位置とは、再生ヘツドが検出対象とする
媒体上の位置を言うものとする。一点鎖線３０１
は記録トラツクの中心、ｙはヘツドに対する媒体
の移動方向を示す。テープ状の媒体においても、
デイスク状の媒体においても必ず記録トラツク３
０２に対し、再生トラツク３０３とは位置ずれを
生ずる。同一の媒体を、複数の記録再生装置の間
で共有使用する場合は、トラツクの位置ずれ量が
特に大きくなる。この結果、記録トラツク位置と
再生トラツク位置のずれに相当する部分３０４，
３０５の影響が再生信号に現れ、信号の信頼性を
劣化させる事になる。記録トラツク幅３０２の内
３０５の幅だけ無効部分となり、同時に３０４の
幅だけ再生すべからざる信号が含まれる事にな
る。従来、所謂るバルクコアを用いたリングヘツ
ドにあつては、同一のリングヘツドを記録再生に
用い、第２図２１０を消去幅とし、２０９を記録
トラツク幅とし、２０８を再生トラツク幅として
いた。この時、再生トラツク位置は記録トラツク
位置に対してｘ方向に誤差の余裕が得られてい
た。又消去幅が記録幅より大きい為、再生トラツ
ク位置は最悪の場合でも消去トラツク内にあれば
再生時の信号の信頼性は保障できた。 These trends are generally explained as well known to those skilled in the art. In FIG. 2, the distribution 207 in the track width direction has a relatively gentle slope, and as a result, the effective recording track width 209 is considerably wider than the head width 208, and the erase width 210 is even wider. In a normal head, 209 is several microns wider than 208, and 210 is about 10 to 20 microns wider than 208. On the other hand, the distribution 21 in the track width direction in FIG.
6 is extremely steep and has an effective recording width 218 that is about the same as the width 217 of the magnetic pole 211. The distribution in the track direction, ie, the y direction, is not significantly different between FIGS. 2 and 3 at 206 and 215. Next, in a magnetic recording/reproducing device, mechanical error or temperature of the device,
FIG. 4 shows fluctuations in the recording track position and reproduction track position caused by the influence of humidity and the like.
The recording track position refers to the location of magnetized data recorded on the medium by the magnetic recording head, and the reproduction track position refers to the position on the medium that the reproduction head detects. Dot-dashed line 301
indicates the center of the recording track, and y indicates the direction of movement of the medium relative to the head. Even in tape-shaped media,
Recording track 3 is always available even on disk-shaped media.
02, a positional deviation occurs from the playback track 303. When the same medium is shared between a plurality of recording and reproducing devices, the amount of track positional deviation becomes particularly large. As a result, a portion 304 corresponding to the deviation between the recording track position and the reproduction track position,
The influence of 305 appears on the reproduced signal, deteriorating the reliability of the signal. Of the recording track width 302, a width 305 becomes an invalid portion, and at the same time, a width 304 contains a signal that should not be reproduced. Conventionally, in a ring head using a so-called bulk core, the same ring head was used for recording and reproducing, and 210 in FIG. 2 was used as the erase width, 209 as the recording track width, and 208 as the reproducing track width. At this time, the reproduction track position had a margin of error in the x direction with respect to the recording track position. Furthermore, since the erasing width is larger than the recording width, even in the worst case, if the reproduction track position is within the erasing track, the reliability of the signal during reproduction can be guaranteed.
これら所謂るバルクコアを用いたリングヘツド
に対し、第５図に示した様な膜状の高透磁率磁性
体を磁極とするヘツドにあつては第３図に示した
如くトラツク幅方向の磁界分布が急峻となり、消
去幅或は記録幅共に磁極幅２１７にほぼ等しくな
る。従つて磁界の拡がりに伴う、再生トラツク位
置ずれ許容誤差は無いに等しい。 In contrast to ring heads using these so-called bulk cores, in the case of a head whose magnetic pole is made of a film-like high permeability magnetic material as shown in Fig. 5, the magnetic field distribution in the track width direction is as shown in Fig. 3. It becomes steep, and both the erase width and the recording width become almost equal to the magnetic pole width 217. Therefore, the permissible error in the positional deviation of the read track due to the spread of the magnetic field is negligible.
本発明は膜状の高透磁率磁極を用いたヘツドに
おいて問題となる、記録トラツクと再生トラツク
の位置ずれに関し、許容ずれ量を与えたヘツドを
供する事を目的とし、バルクリングヘツドと同等
又は、それ以上の許容ずれ量が得られるヘツドを
供するものである。以下本発明になるヘツドに関
し、実施例に基いて説明する。 The purpose of the present invention is to provide a head with a permissible amount of misalignment between the recording track and the reproducing track, which is a problem in heads using film-like high magnetic permeability magnetic poles, and which is equivalent to or equal to bulk ring heads. The present invention provides a head that can provide a greater amount of permissible deviation. The head according to the present invention will be explained below based on examples.
第５図は本発明になるヘツド例についてその断
面図を示してある。４０４は磁気記録媒体で、ヘ
ツドに対しｙ方向に移動するものとする。Ｃはト
ラツク方向の断面図、Ｄはトラツク幅方向の断面
図である。４０１と４０２は膜状の高透磁率磁性
膜である。４０７は上側ヘツド基板である。４０
６は媒体下側に設けた磁性コアでバルクフエライ
ト等で形成される。Ｄに示す如く、磁性膜４０１
の媒体対向部分の幅は、磁性膜４０２の媒体対向
部分の幅より大きく、又それぞれの膜幅方向の中
心は一致している。磁性膜４０１と４０２の端面
は、媒体を挾んで対向する磁性コア４０６の端面
内において該磁性コア４０６と対向している。磁
性コア４０６には記録用コイル４０５が巻いてあ
り、磁性膜４０２には、再生用コイル４０３が巻
いてある。磁性膜４０１は、媒体に対するヘツド
の移動方向に対して磁性膜４０２の後側に配され
ている。記録時に、コイル４０５に記録電流を流
すと、磁束は、磁性膜４０１と４０２の先端で媒
体に対向する端面部にそれぞれ集中し、該磁束集
中部分の媒体が記録磁化される。ヘツド移動方向
の後部に磁性膜４０１がある事から、最終的に媒
体上に残る記録磁化は磁性膜４０１の先端部で磁
化記録されたデータだけとなる。再生時には、磁
性膜４０１，４０２の中を、それぞれの膜端面が
対向する媒体上の磁化に基く磁束が通る。検出コ
イルは磁性膜４０２に巻いておく事により、検出
再生は磁性膜４０２の膜端面が対向する媒体部分
について行なう。磁性膜４０２の媒体対向面付近
での幅を、磁性膜４０１の媒体対向面付近での幅
に対し、該ヘツドを使用する磁気記録装置におけ
るヘツド媒体間設定誤差を許容できる様に予め狭
めておき、再生トラツク位置が記録トラツク位置
の中にある様にする。例えば磁性膜４０１による
記録トラツク幅を第２図２１０に一致させ、磁性
膜４０２による再生トラツク幅を２０８に一致さ
せる。この結果本発明になるヘツドの、再生トラ
ツク位置ずれ許容誤差は従来リングヘツド第３図
と同等になる。 FIG. 5 shows a cross-sectional view of an exemplary head according to the present invention. 404 is a magnetic recording medium that moves in the y direction with respect to the head. C is a sectional view in the track direction, and D is a sectional view in the track width direction. 401 and 402 are film-like high permeability magnetic films. 407 is an upper head board. 40
A magnetic core 6 is provided below the medium and is made of bulk ferrite or the like. As shown in D, the magnetic film 401
The width of the medium facing portion of the magnetic film 402 is larger than the width of the medium facing portion of the magnetic film 402, and the centers of the respective films in the width direction coincide with each other. The end faces of the magnetic films 401 and 402 face the magnetic core 406 within the end faces of the magnetic core 406, which face each other with the medium in between. A recording coil 405 is wound around the magnetic core 406, and a reproducing coil 403 is wound around the magnetic film 402. The magnetic film 401 is arranged behind the magnetic film 402 with respect to the direction of movement of the head relative to the medium. During recording, when a recording current is passed through the coil 405, magnetic flux is concentrated at the end faces of the magnetic films 401 and 402 facing the medium, and the medium in the magnetic flux concentrated portions is magnetized for recording. Since the magnetic film 401 is located at the rear in the head movement direction, the only recording magnetization that ultimately remains on the medium is the data that was magnetized and recorded at the tip of the magnetic film 401. During reproduction, magnetic flux based on the magnetization on the medium whose end surfaces face each other passes through the magnetic films 401 and 402. By winding the detection coil around the magnetic film 402, detection and reproduction is performed on the portion of the medium where the film end surfaces of the magnetic film 402 face each other. The width of the magnetic film 402 near the medium facing surface is made narrower than the width of the magnetic film 401 near the medium facing surface in advance so as to allow for head-medium setting errors in the magnetic recording apparatus using the head. , so that the playback track position is within the recording track position. For example, the recording track width by the magnetic film 401 is made to match 210 in FIG. 2, and the reproduction track width by the magnetic film 402 is made to match 208. As a result, the playback track position deviation tolerance of the head according to the present invention is the same as that of the conventional ring head shown in FIG.
薄膜４０１の記録トラツク幅と薄膜４０２の再
生トラツク幅との比、即ち実効的に薄膜４０１と
４０２の媒体対向部分での幅の比を、第２図２１
０と２０８の比よりも大きく取る事によつて、従
来リングヘツドよりも、許容ずれ量を大きくする
事ができる。 The ratio of the recording track width of the thin film 401 to the reproduction track width of the thin film 402, that is, the effective ratio of the widths of the thin films 401 and 402 at the portion facing the medium, is shown in FIG.
By setting the ratio to be larger than the ratio of 0 to 208, the allowable deviation amount can be made larger than that of the conventional ring head.
本発明になる磁気ヘツドの構造と効果について
基本的な原理は以上の通りであり、高密度記録に
おいて必要となる高透磁率磁性膜を用いたヘツド
においても、再生トラツク位置ずれ許容誤差を、
記録再生装置の形態、仕様に合せて適当に設定で
きる事が最大の特徴となる。勿論、応用ヘツドの
形態としては様々あるが、基本的に、記録用薄膜
磁極幅に対して再生用薄膜磁極幅を小さくしたヘ
ツドを本発明に帰属するものとする。 The basic principle of the structure and effect of the magnetic head of the present invention is as described above, and even in a head using a high magnetic permeability magnetic film required for high-density recording, the permissible error of playback track position deviation can be maintained.
The biggest feature is that it can be set appropriately according to the format and specifications of the recording/reproducing device. Of course, there are various forms of applied heads, but basically the present invention belongs to a head in which the width of the thin-film magnetic pole for reproduction is smaller than the width of the thin-film magnetic pole for recording.
ここで本発明になる別のヘツド例を示す。第６
図において、媒体５０１を上下両側から挾む様に
上側ヘツド５０２と下側ヘツド５０３が対向して
いる。上側ヘツド５０２には薄膜磁極４０１と４
０２が既述の如く形成され、４０２には再生コイ
ル４０３が巻いてある。更に、上側ヘツド５０２
は、媒体対向面とは反対側において、磁性薄膜４
０１，４０２と接する若しくは近接し、媒体対向
内面側でこれらと離反した磁気コア５０４があ
る。下側ヘツドにおいても、磁気コア４０６に対
し、媒体対向面側で離反し、反対側で近接する磁
気コア５０５がある。磁性薄膜４０１，４０２と
コア４０６，５０４，５０５は、記録時、及び再
生時において磁気的な閉回路を構成し、記録、及
び再生の効率を向上する。同時に、外部磁界に対
しても、再生信号のＳ／Ｎ比を保護する。コア４
０６と５０５は一体で構成する事もできる。第７
図は更に別のヘツド例があり、下側ヘツドには空
芯の記録用コイル６０１がある。記録時にコイル
６０１が発生する磁界は、薄膜４０１と４０２の
先端に集中し、媒体を記録磁化する事から、多少
の記録効率を落としても、ヘツド構造を簡単にし
て製造し易くした例である。第８図は更に、下側
ヘツドを不要にしたヘツドの構造例である。磁性
薄膜４０１，４０２を芯とする様に記録用コイル
７０１が巻いてある。再生用コイルは、既述のヘ
ツドと同様に、薄膜４０２に対してのみ巻かれて
いる。第９図は、第８図のヘツド構造について、
磁性薄膜４０１，４０２のみならず、コイルにつ
いても薄膜によつて実際に形成したものであり、
ヘツドのトラツク方向断面図を示してある。８０
１は媒体である。８０５は磁気コアで、Ni―Zn
フエライト焼結体を用いている。記録用コイル７
０１に相当するコイル８０４を、コア８０５を基
板としてその上に、うず巻き状にアルミニウムの
薄膜で形成してある。うず巻き状のパターンは、
アルミニウム薄膜蒸着後、ホトリゾグラフイプロ
セスでエツチングにより形成する。更に、絶縁層
の形成と、エツチング工程とを重ねて、順次高透
磁率磁性膜４０１、絶縁層、コイル７０２の下側
部分導体パターン８０３、絶縁層、磁性薄膜４０
２、絶縁層、コイル７０２の上側導体パターン８
０６を形成する。８０３と８０６は磁性層４０２
の無い部分で結合され、４０２を囲うコイル構造
を形成する。又、磁性膜４０１と４０２は、コイ
ル８０４の中心付近で、磁気コア８０５と近接す
る。全層の膜を形成して後、保護層８０７を形成
してヘツド構造ができ上る。このままの形状で、
該薄膜形成部分を後端とする磁気デイスク用浮上
ヘツドスライダーの加工をする事ができる。更に
又、保護層の上にスライダ材をはり合せば第７図
の様なフロツピーデイスク用或はテープ用ヘツド
の形状に加工する事ができる。第１０図は更に別
のヘツド構造を示す。第５図４０１に相当する磁
性膜９０１と４０２に相当する磁性膜９０２とが
あり、記録用コイル９０３は、磁性膜９０１のみ
に巻いてある。記録時に磁性膜９０２は励磁され
ず、従つて、磁性膜９０１に接する媒体面のみが
磁化される事になる。又、記録用磁性膜９０３の
膜厚を媒体対向近傍で図の如く薄くする事によ
り、記録磁界を大きくし、効率を向上できる。再
生側磁性膜については単一膜厚で構わない。記録
再生の基本的な原理は第５図の場合に準ずるもの
である。 Here, another example of the head according to the present invention will be shown. 6th
In the figure, an upper head 502 and a lower head 503 face each other so as to sandwich a medium 501 from above and below. The upper head 502 has thin film magnetic poles 401 and 4.
02 is formed as described above, and a reproducing coil 403 is wound around 402. Furthermore, the upper head 502
is a magnetic thin film 4 on the side opposite to the medium facing surface.
There is a magnetic core 504 that is in contact with or close to 01 and 402 and is separated from them on the inner surface facing the medium. In the lower head as well, there is a magnetic core 505 which is separated from the magnetic core 406 on the medium facing surface side and is close to the magnetic core 406 on the opposite side. The magnetic thin films 401, 402 and the cores 406, 504, 505 form a magnetic closed circuit during recording and reproduction, improving the efficiency of recording and reproduction. At the same time, the S/N ratio of the reproduced signal is protected against external magnetic fields. core 4
06 and 505 can also be configured as one unit. 7th
The figure shows another example of a head, and the lower head has an air-core recording coil 601. The magnetic field generated by the coil 601 during recording is concentrated at the tips of the thin films 401 and 402 and magnetizes the medium for recording, so this is an example in which the head structure is simplified and manufactured easier even if the recording efficiency is reduced to some extent. . FIG. 8 further shows an example of the structure of a head that eliminates the need for a lower head. A recording coil 701 is wound around the magnetic thin films 401 and 402 as its core. The reproduction coil is wound only around the thin film 402, similar to the previously described head. Figure 9 shows the head structure in Figure 8.
Not only the magnetic thin films 401 and 402 but also the coils are actually formed of thin films,
A cross-sectional view of the head in the track direction is shown. 80
1 is the medium. 805 is a magnetic core, Ni-Zn
A sintered ferrite body is used. Recording coil 7
A coil 804 corresponding to No. 01 is formed on a core 805 as a substrate in a spiral shape using a thin aluminum film. The spiral pattern is
After depositing an aluminum thin film, it is formed by etching using a photolithography process. Furthermore, by repeating the formation of the insulating layer and the etching process, the high permeability magnetic film 401, the insulating layer, the lower partial conductor pattern 803 of the coil 702, the insulating layer, and the magnetic thin film 40 are sequentially formed.
2. Insulating layer, upper conductor pattern 8 of coil 702
Form 06. 803 and 806 are magnetic layers 402
402 to form a coil structure surrounding 402. Further, the magnetic films 401 and 402 are close to the magnetic core 805 near the center of the coil 804. After forming all layers of the film, a protective layer 807 is formed to complete the head structure. With this shape,
It is possible to process a flying head slider for a magnetic disk with the thin film formed portion as the rear end. Furthermore, by gluing a slider material onto the protective layer, it can be processed into the shape of a floppy disk or tape head as shown in FIG. FIG. 10 shows yet another head structure. There are a magnetic film 901 corresponding to 401 in FIG. 5 and a magnetic film 902 corresponding to 402, and a recording coil 903 is wound only around the magnetic film 901. During recording, the magnetic film 902 is not excited, and therefore only the medium surface in contact with the magnetic film 901 is magnetized. Furthermore, by reducing the thickness of the recording magnetic film 903 near the medium facing region as shown in the figure, the recording magnetic field can be increased and the efficiency can be improved. The magnetic film on the reproduction side may have a single thickness. The basic principle of recording and reproduction is similar to the case shown in FIG.
第１図は、本発明が係る磁気ヘツドに関する構
造と原理を示した図である。第２図はリング型ヘ
ツドの磁界分布、第３図は本発明が係る薄膜磁極
の磁界分布を示す。第４図は媒体上での磁気ヘツ
ドの記録トラツク位置と再生トラツク位置のずれ
量を示す。第５，６，７，８，９図は本発明にな
る磁気ヘツドの実施例である。第１０図は、第９
図の具体的な構造について実施例の断面形状を示
している。
１０３，２１１，４０１，４０２……高透磁率
磁性膜、１０１，４０４，５０１……磁気記録媒
体、４０５，６０１，７０１，８０４……記録用
コイル、４０３，７０２，８０３，８０６……再
生用コイル、２０８，２１７……ヘツド幅、２０
９，２１８……記録幅、２１０……消去幅。
FIG. 1 is a diagram showing the structure and principle of a magnetic head according to the present invention. FIG. 2 shows the magnetic field distribution of the ring type head, and FIG. 3 shows the magnetic field distribution of the thin film magnetic pole according to the present invention. FIG. 4 shows the amount of deviation between the recording track position and the reproducing track position of the magnetic head on the medium. Figures 5, 6, 7, 8 and 9 show embodiments of the magnetic head according to the present invention. Figure 10 shows the 9th
The cross-sectional shape of an example of the specific structure in the figure is shown. 103,211,401,402...High permeability magnetic film, 101,404,501...Magnetic recording medium, 405,601,701,804...Recording coil, 403,702,803,806...For reproduction Coil, 208, 217...Head width, 20
9,218... Recording width, 210... Erasing width.
Claims (1)
に略直角となる面を持ち各々独立して間隔をもつ
て配置される第１と第２の膜状高透磁率磁性層
と、前記第１の膜状高透磁率磁性層に巻回される
第１のコイルと、前記第１と第２の膜状高透磁率
磁性層に対し同一極性の磁界を発生する第２コイ
ルからなり、前記第１膜状高透磁率磁性層の幅を
前記第２膜状高透磁率磁性層の幅より小さくする
とともに各々の中心部をほぼ対向して配置し、記
録時には前記第２コイルにより発生される同一極
性の記録磁界によつて前記第１と前記第２の膜状
高透磁率磁性層を同時に励磁するとともに前記第
２膜状高透磁率磁性層を後端として前記記録媒体
を記録磁化し、再生時には前記記録媒体から前記
第１膜状高透磁率磁性層に漏れ込む磁束を前記第
１コイルにより検出することを特徴とする磁気ヘ
ツド。1 first and second film-like high permeability magnetic layers having surfaces substantially perpendicular to the medium surface near the surface facing the magnetic recording medium and arranged independently with a gap between them; a first coil wound around the film-like high permeability magnetic layer; and a second coil that generates a magnetic field of the same polarity to the first and second film-like high permeability magnetic layers; The width of one film-like high-permeability magnetic layer is made smaller than the width of the second film-like high-permeability magnetic layer, and the centers of each layer are arranged substantially opposite each other, so that the same magnetic layer generated by the second coil during recording is The first and second film-like high permeability magnetic layers are simultaneously excited by a polar recording magnetic field, and the recording medium is magnetized for recording with the second film-like high permeability magnetic layer as the rear end, and reproduction is performed. A magnetic head characterized in that the magnetic flux sometimes leaking from the recording medium into the first film-like high permeability magnetic layer is detected by the first coil.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21324981A JPS58115615A (en) | 1981-12-28 | 1981-12-28 | Magnetic head |
| US06/446,119 US4575777A (en) | 1981-12-08 | 1982-12-02 | Magnetic recording and reproducing head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21324981A JPS58115615A (en) | 1981-12-28 | 1981-12-28 | Magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58115615A JPS58115615A (en) | 1983-07-09 |
| JPH0154766B2 true JPH0154766B2 (en) | 1989-11-21 |
Family
ID=16635971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21324981A Granted JPS58115615A (en) | 1981-12-08 | 1981-12-28 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58115615A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6226612A (en) * | 1985-07-27 | 1987-02-04 | Sony Corp | Composite type single magnetic pole magnetic head |
| US4642709A (en) * | 1985-10-16 | 1987-02-10 | International Business Machines Corporation | Twin track vertical magnetic recording servo control method |
| DE69117323T2 (en) | 1990-04-16 | 1996-07-11 | Hitachi Ltd | Thin film magnetic head with a narrow track width and its manufacturing process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5613514A (en) * | 1979-07-16 | 1981-02-09 | Olympus Optical Co Ltd | Magnetic head |
-
1981
- 1981-12-28 JP JP21324981A patent/JPS58115615A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5613514A (en) * | 1979-07-16 | 1981-02-09 | Olympus Optical Co Ltd | Magnetic head |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58115615A (en) | 1983-07-09 |
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