JPH01296417A - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPH01296417A JPH01296417A JP12571288A JP12571288A JPH01296417A JP H01296417 A JPH01296417 A JP H01296417A JP 12571288 A JP12571288 A JP 12571288A JP 12571288 A JP12571288 A JP 12571288A JP H01296417 A JPH01296417 A JP H01296417A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- magnetic head
- air gap
- permeability
- recording
- 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
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
- G11B5/245—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for controlling the reluctance of the magnetic circuit in a head with single gap, for co-operation with one track
- G11B5/2452—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features comprising means for controlling the reluctance of the magnetic circuit in a head with single gap, for co-operation with one track where the dimensions of the effective gap are controlled
-
- 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
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は情報を磁化反転の形で記録する磁気記録装置に
係り、特に記録時には強記録磁界を発生させ、再生時に
は疑似空隙およびタロストークの影響をなくし再生信号
のＳ／Ｎを向上させるに好適な磁気ヘッドに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording device that records information in the form of magnetization reversal, and in particular generates a strong recording magnetic field during recording and eliminates the effects of pseudo-gap and talostoke during reproduction. The present invention relates to a magnetic head suitable for eliminating noise and improving the S/N of reproduced signals.
従来の磁気ヘッドの技術として、記録時には強記録磁界
を発生させるために磁路の断面積を太きくしたものがあ
る。しかし、そのためにポールピース部分の面積も大き
くなる。一方、再生時には磁気ヘッドの分解能を高める
ために、ビット長に対するポールピース長を小さくする
必要がある。Conventional magnetic head technology includes a method in which the cross-sectional area of the magnetic path is increased in order to generate a strong recording magnetic field during recording. However, this also increases the area of the pole piece portion. On the other hand, in order to improve the resolution of the magnetic head during reproduction, it is necessary to reduce the pole piece length relative to the bit length.
そこでポールピース部分に高飽和磁束密度を持つ磁性材
料を用いて、ポールピース長は短くても強記録磁界を発
生させうる構造にしていた。この構造では、２種類の磁
性体の接合面が空隙の長手方向と平行になると疑似の空
隙となり、信号のＳ／Ｎを劣化させていた。この状態を
防止するために、特開昭５４−９６０１３に記載のよう
に、磁性体の接合面が空隙の長手方向と非平行になる構
造にしていた。この構造ならば、再生時にはアジマス損
失として再生感度が低くなるために疑似空隙の影響は防
止できた。Therefore, a magnetic material with a high saturation magnetic flux density was used in the pole piece to create a structure that could generate a strong recording magnetic field even if the pole piece was short. In this structure, when the joining surfaces of the two types of magnetic materials become parallel to the longitudinal direction of the gap, a pseudo gap is created, which deteriorates the S/N ratio of the signal. In order to prevent this situation, as described in Japanese Unexamined Patent Publication No. 54-96013, a structure was used in which the bonding surface of the magnetic material was not parallel to the longitudinal direction of the gap. With this structure, the influence of pseudo voids could be prevented since the reproduction sensitivity would be lowered due to azimuth loss during reproduction.
上記の従来技術では、ポールピース長が長くなるために
記録時には空隙の幅方向に広く漏れ磁界が発生し、記録
減磁が大きくなるという不具合があった。さらにトラッ
ク幅方向では、記録時のトラック幅と再生時のトラック
幅が同じであることから、隣接トラックの情報がクロス
トークノイズとして読まれるという不具合もあった。In the above-mentioned conventional technology, there is a problem in that the length of the pole piece becomes long, so that a leakage magnetic field is generated widely in the width direction of the gap during recording, and recording demagnetization becomes large. Furthermore, in the track width direction, since the track width during recording and the track width during reproduction are the same, there is also the problem that information on adjacent tracks is read as crosstalk noise.
本発明の目的は、記録時には強記録磁界を得るために磁
路の断面積を大きくかつ空隙の幅方向の漏れ磁界の広さ
を狭くし、再生時には疑似空隙による影響を防ぎかつタ
ロストークノイズを読まないようにすることにある。The purpose of the present invention is to increase the cross-sectional area of the magnetic path and narrow the leakage magnetic field in the width direction of the air gap in order to obtain a strong recording magnetic field during recording, and to prevent the influence of pseudo air gaps and reduce Talostok noise during playback. The goal is to avoid reading it.
上記目的は、一つの磁性体中の空隙近傍部分の透磁率を
高め、透磁率の境界面を空隙の長手方向と非平行に作っ
ておき、さらにトラック幅方向では高透磁率部分はトラ
ック幅より狭くした構造にすることにより達成される。The above purpose is to increase the magnetic permeability in the vicinity of the air gap in one magnetic material, to make the boundary surface of magnetic permeability non-parallel to the longitudinal direction of the air gap, and furthermore, in the track width direction, the high permeability area is higher than the track width. This is achieved by creating a narrow structure.
磁性体中の空隙近傍部分を高透磁率（２０００程度）に
し、空隙近傍以外を低透磁率にする。この時高透磁率部
分は低透磁率部分の約１０程度度でよい。さらに低透磁
率部分は少なくとも１００程度は必要である。The part of the magnetic material near the air gap has high magnetic permeability (approximately 2000), and the area other than the area near the air gap has low magnetic permeability. At this time, the high magnetic permeability portion may be about 10 degrees of the low magnetic permeability portion. Furthermore, a low magnetic permeability portion of at least about 100 is required.
記録時には磁性体全体から漏れ磁束をだすために、飽和
磁束数は大きくなり、強記録磁界を得ることができる。During recording, leakage magnetic flux is emitted from the entire magnetic body, so the saturation magnetic flux number increases and a strong recording magnetic field can be obtained.
さらに空隙部分の透磁率が高くなっているために、空隙
近傍の記録磁界はさらに強くなる。一方再生時には記録
媒体からの漏れ磁束を磁気ヘッドの高透磁率部分のみで
読み取るので、等測的に疑似空隙部分が空隙の長手方向
と非平行になる。それによって疑似空隙によるＳ／Ｈの
低下は防止できる。またトラック幅方向で見ると、幅広
く記録して狭く読むことから、隣接トラックの情報があ
る位置までの間隔が広くなる。媒体からの漏れ磁界は間
隔の２乗に反比例してか弱くなるので、ノイズとして読
まれる磁束数が少なくなりクロストークノイズを低減す
ることができる。Furthermore, since the magnetic permeability of the air gap portion is increased, the recording magnetic field near the air gap becomes even stronger. On the other hand, during reproduction, leakage magnetic flux from the recording medium is read only by the high magnetic permeability portion of the magnetic head, so that the pseudo gap portion is isometrically non-parallel to the longitudinal direction of the gap. Thereby, a decrease in S/H due to pseudo voids can be prevented. In addition, when viewed in the track width direction, since the information is recorded widely and read narrowly, the distance between adjacent tracks and the position where the information is located becomes wider. Since the leakage magnetic field from the medium becomes weaker in inverse proportion to the square of the interval, the number of magnetic fluxes read as noise decreases, and crosstalk noise can be reduced.
以下、本発明の一実施例を説明する。第１図。 An embodiment of the present invention will be described below. Figure 1.
第２図は、薄膜ヘッドの記録媒体対抗面から見た図であ
る。従来の薄膜ヘッドでは、第２図に示すようにポール
ピース部の透磁率はどの部分も同じ（μ）である。これ
を第１図のように、ボールビ−スの空隙ｇ近傍でトラッ
ク幅方向の中央部に透磁率の高い部分（μｈ）を設け、
それ以外の部分には透磁率の低い部分（μＱ）を設ける
。さらに、透磁率の境界面ａａ’ を空隙の長手方向と
非平行になるように設ける。このようにすることによっ
て、記録時には第３図に示すように磁性体部分会てがボ
ールになり、記録トラック幅はＴｗになる。FIG. 2 is a view of the thin film head viewed from the surface facing the recording medium. In the conventional thin-film head, the magnetic permeability of the pole piece portion is the same (μ) everywhere, as shown in FIG. As shown in Fig. 1, a high permeability portion (μh) is provided at the center in the track width direction near the gap g of the ball bead.
A portion with low magnetic permeability (μQ) is provided in the other portions. Further, a magnetic permeability boundary surface aa' is provided so as to be non-parallel to the longitudinal direction of the gap. By doing so, during recording, the magnetic material portions form a ball as shown in FIG. 3, and the recording track width becomes Tw.
一方再生時には、第４図に示すように高透磁率部分のみ
が見えて、再生トラック幅はＴｒになる。On the other hand, during reproduction, only the high permeability portion is visible as shown in FIG. 4, and the reproduction track width is Tr.
さらに、透磁率の境界面で空隙の長手方向と平行になる
部分がなく、疑似空隙の影響をなくすることができる。Furthermore, there is no part of the magnetic permeability boundary that is parallel to the longitudinal direction of the air gap, and the influence of pseudo air gaps can be eliminated.
また記録トラック幅Ｔｗと再生１−ラック幅Ｔｒの間に
はＴｗ）Ｔｒの関係にあることから、隣接トラックから
のタロストークノイズを低減することができる。Further, since there is a relationship Tw)Tr between the recording track width Tw and the reproduction 1-rack width Tr, it is possible to reduce the tarostalk noise from adjacent tracks.
本発明の他の実施例を説明する。第５図は、バルクヘッ
ドの空隙部分に高飽和磁束密度材料を蒸着した場合のヘ
ッドの一部分を表した図である。Another embodiment of the present invention will be described. FIG. 5 is a diagram showing a portion of the head when a high saturation magnetic flux density material is deposited in the gap portion of the bulk head.
本ヘッドは磁性体で構成するが、記録再生に関与する部
分は主として高飽和磁束密度材料部分５０１である。そ
こで、高飽和磁束密度材料５０１の内部を高透磁率／低
透磁率部分に分け、記録再生時にそれぞれの効果を生か
した。Although this head is made of a magnetic material, the part involved in recording and reproduction is mainly the high saturation magnetic flux density material part 501. Therefore, the inside of the high saturation magnetic flux density material 501 was divided into high magnetic permeability and low magnetic permeability parts, and the effects of each part were utilized during recording and reproduction.
５０１の透磁率境界面の内部形状の拡大図を第６図に示
した。媒体対抗面での高透磁率部分は、空隙の長手方向
を底辺とする三角形にする。さらに、媒体対抗面から内
部方向に進むに従い、断面積を大きくして磁気抵抗を下
げるために、三角形の頂点から稜線２本による面を作る
。この面は、空隙を形成する面と対面になる。これによ
って、薄膜ヘッドと同様に、クロストークノイズの低減
、疑似空隙によるＳ／Ｎ劣化の防止が達成できる。An enlarged view of the internal shape of the magnetic permeability boundary surface of 501 is shown in FIG. The high permeability portion on the surface facing the medium has a triangular shape with its base in the longitudinal direction of the air gap. Furthermore, in order to increase the cross-sectional area and lower the magnetic resistance as one moves inward from the medium facing surface, a surface is formed by two ridge lines from the apex of the triangle. This surface faces the surface forming the void. This makes it possible to reduce crosstalk noise and prevent S/N deterioration due to pseudo voids, similar to the thin film head.
また空隙部の形状は、再生トラック幅部分では空隙の長
手方向には平行にする必要があるが、記録トラック幅部
分では平行でなくてもよい。Further, the shape of the gap needs to be parallel to the longitudinal direction of the gap in the reproduction track width portion, but it does not need to be parallel in the recording track width portion.
本発明によれば、同一磁気ヘッドにより記録再生を行い
、記録トラック幅より再生トラック幅の方が狭いことか
らクロストークノイズを低減できる。その低減効果（ク
ロストークノイズの大きさＮ ｃ ）は、
Ｎ ｃ ｃｅ １ ／ （（Ｔ ｗ −Ｔ ｒ ）
／ ２ ） ２になる。一方再生のときの疑似空隙
部分は、空隙の長手方向と非平行であるために、アジマ
ス損失により疑似空隙部の再生によるノイズの大きさを
低減できる。アジマス角とアジマス損失の関係は、公知
である。また記録時には磁性体全体を用いることから、
記録磁界を強めることができる。その効果ＨＷは、
Ｈｗｃｅ １／（１−（（Ｔｗ＊ｔａｎＯ）／（２’ｋ
Ｐ）））になる。ここでＰはボール厚さの最大値、０
はアジマス角である。According to the present invention, recording and reproduction are performed using the same magnetic head, and crosstalk noise can be reduced because the reproduction track width is narrower than the recording track width. The reduction effect (size Nc of crosstalk noise) is Ncce1/((Tw-Tr)
/ 2) becomes 2. On the other hand, since the pseudo-gap portion during reproduction is non-parallel to the longitudinal direction of the gap, the magnitude of noise due to reproduction of the pseudo-gap portion can be reduced by azimuth loss. The relationship between azimuth angle and azimuth loss is well known. Also, since the entire magnetic material is used during recording,
The recording magnetic field can be strengthened. The effect HW is Hwce 1/(1-((Tw*tanO)/(2'k
P))) becomes. Here, P is the maximum ball thickness, 0
is the azimuth angle.
第１図は本発明の第１の実施例であり記録媒体対抗面か
ら見た磁気ヘットのポール部の平面図、第２図は従来形
磁気ヘッドのポール部の平面図、第３図は第１の実施例
で記録時の等価ポール形状図、第４図は第１の実施例で
再生時の等価ポール形状図、第５図は本発明の第２の実
施例であるバルクヘッドの空隙近傍の外観図、第６図は
第５図のＡＡ’から見た高飽和磁束密度材料の透視図で
ある。
ｇ・・・空隙、Ｔｗ・・・記録時の等価トラック幅、Ｔ
ｒ・・・再生時の等価トランク幅、ａａ’・・・透磁率
の境界面、μ・・・透磁率、μｈ・・・高透磁率、μ悲
・低透磁率、５０１・・・高飽和磁束密度材料、６０
１・・透磁率の境界面。FIG. 1 shows a first embodiment of the present invention, and is a plan view of the pole portion of a magnetic head seen from the surface facing the recording medium, FIG. 2 is a plan view of the pole portion of a conventional magnetic head, and FIG. FIG. 4 is a diagram of the equivalent pole shape during recording in the first embodiment, FIG. 4 is a diagram of the equivalent pole shape during reproduction in the first embodiment, and FIG. 5 is the vicinity of the gap in the bulkhead according to the second embodiment of the present invention. FIG. 6 is a perspective view of the high saturation magnetic flux density material seen from AA' in FIG. g...Gap, Tw...Equivalent track width during recording, T
r...Equivalent trunk width during playback, aa'...Boundary surface of magnetic permeability, μ...Magnetic permeability, μh...High magnetic permeability, μ-low magnetic permeability, 501...High saturation magnetic flux density material, 60
1...Boundary surface of magnetic permeability.
Claims (1)
る磁気ヘッドにおいて、一つの磁性体中の空隙近傍部分
の透磁率を変化させ、透磁率の境界面を空隙の長手方向
と非平行になるように配置し、空隙部分を構成したこと
を特徴とする磁気ヘッド。 ２、情報を記録する場合は、磁性体の全体を利用し磁束
数を増すことにより強磁界を発生させたことを特徴とす
る磁気ヘッド。 ３、磁化反転を再生する場合は、透磁率の高い磁性体の
部分のみを利用して疑似空隙の影響である主ピークと逆
極性のピークを主ピークの一方または両方に生じさせな
いことを特徴とする磁気ヘッド。 ４、磁性体の一部を熱、圧力または化学変化によつて組
成変形させることにより、透磁率のことなる磁性材料を
生成させたことを特徴とする磁気ヘッド。 ５、熱、圧力または化学変化によつて透磁率が変化する
材料を用いることを特徴とする磁気ヘッド。 ６、トラック幅方向に広く記録し、狭く読むことにより
クロストークノイズを低減させたことを特徴とする磁気
ヘッド。 ７、空隙部近傍に高飽和磁束密度材料を用いたことを特
徴とする請求項第１項記載の磁気ヘッド。[Claims] 1. In a magnetic head formed of a ring-shaped magnetic material with an air gap in a part thereof, the magnetic permeability of a portion of one magnetic material near the air gap is changed, and the boundary surface of the magnetic permeability is changed to the boundary surface of the air gap. A magnetic head characterized in that the magnetic head is arranged non-parallel to the longitudinal direction and has a gap portion. 2. A magnetic head characterized in that when recording information, a strong magnetic field is generated by using the entire magnetic body and increasing the number of magnetic fluxes. 3. When reproducing magnetization reversal, only the part of the magnetic material with high magnetic permeability is used to prevent the main peak and the opposite polarity peak from occurring in one or both of the main peaks due to the influence of the pseudo air gap. magnetic head. 4. A magnetic head characterized in that magnetic materials with different magnetic permeabilities are produced by changing the composition of a part of the magnetic material by heat, pressure, or chemical change. 5. A magnetic head characterized by using a material whose magnetic permeability changes due to heat, pressure, or chemical change. 6. A magnetic head characterized in that crosstalk noise is reduced by recording widely in the track width direction and reading narrowly. 7. The magnetic head according to claim 1, characterized in that a high saturation magnetic flux density material is used near the air gap.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12571288A JPH01296417A (en) | 1988-05-25 | 1988-05-25 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12571288A JPH01296417A (en) | 1988-05-25 | 1988-05-25 | Magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01296417A true JPH01296417A (en) | 1989-11-29 |
Family
ID=14916878
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12571288A Pending JPH01296417A (en) | 1988-05-25 | 1988-05-25 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01296417A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5168409A (en) * | 1989-02-08 | 1992-12-01 | Hitachi, Ltd. | Integrated magnetic head having a magnetic layer functioning as both a magnetic shield and a magnetic pole |
| JPH04366403A (en) * | 1991-06-14 | 1992-12-18 | Nec Corp | Vertical magnetic head and its manufacture |
-
1988
- 1988-05-25 JP JP12571288A patent/JPH01296417A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5168409A (en) * | 1989-02-08 | 1992-12-01 | Hitachi, Ltd. | Integrated magnetic head having a magnetic layer functioning as both a magnetic shield and a magnetic pole |
| JPH04366403A (en) * | 1991-06-14 | 1992-12-18 | Nec Corp | Vertical magnetic head and its manufacture |
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