JPH0440769B2 - - Google Patents
Info
- Publication number
- JPH0440769B2 JPH0440769B2 JP8711582A JP8711582A JPH0440769B2 JP H0440769 B2 JPH0440769 B2 JP H0440769B2 JP 8711582 A JP8711582 A JP 8711582A JP 8711582 A JP8711582 A JP 8711582A JP H0440769 B2 JPH0440769 B2 JP H0440769B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic pole
- recording
- head
- main
- magnetic
- 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
- 238000004804 winding Methods 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 9
- 230000005284 excitation Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 101000606504 Drosophila melanogaster Tyrosine-protein kinase-like otk Proteins 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 230000005415 magnetization Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000010409 thin film Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 230000008602 contraction Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000000694 effects Effects 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Description
【発明の詳細な説明】
本発明は、磁気記録媒体を厚み方向に磁化して
信号を記録する垂直磁気記録方式（公開特許公報
昭52−134706）のための磁気ヘツドに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head for a perpendicular magnetic recording system (Japanese Unexamined Patent Publication No. 134706/1989) in which a magnetic recording medium is magnetized in the thickness direction to record signals.
垂直磁気記録方式に用いられる磁気ヘツドとし
ては補助磁極励磁型ヘツドが記録効率、記録分解
能の点で有利である（公開特許公報昭53−32009
同ヘツドの概念図を第１図に示す。同図において
１は、高透磁率磁性体薄膜からなる主磁極部例え
ば主磁極、２は高透磁率磁性体ブロツクからなる
補助磁極部例えば補助磁極、３は記録層、４は巻
線である。同ヘツドでは、記録時には巻線に信号
を加えて補助磁極を励磁し、補助磁極の磁力線を
主磁極に集束させて、主磁極先端で、記録層に記
録を行なう。この様な構造では、主磁極の先端が
磁化され易いこと、及び主磁極が記録層に垂直な
磁界を急峻に発生することから、記録効率及び記
録分解能が高い。また再生は、記録層の磁化が主
磁極を磁化し、主磁極の磁化が補助磁極に検出さ
れることによつて行なわれる。 As a magnetic head used in the perpendicular magnetic recording system, an auxiliary magnetic pole excitation type head is advantageous in terms of recording efficiency and recording resolution (Japanese Patent Publication No. 1983-32009).
A conceptual diagram of the head is shown in Figure 1. In the figure, 1 is a main magnetic pole made of a thin film of high permeability magnetic material, for example the main pole, 2 is an auxiliary magnetic pole made of a block of high permeability magnetic material, eg an auxiliary magnetic pole, 3 is a recording layer, and 4 is a winding. In this head, during recording, a signal is applied to the winding to excite the auxiliary magnetic pole, the lines of magnetic force of the auxiliary magnetic pole are focused on the main magnetic pole, and recording is performed on the recording layer at the tip of the main magnetic pole. In such a structure, the tip of the main pole is easily magnetized and the main pole sharply generates a magnetic field perpendicular to the recording layer, resulting in high recording efficiency and recording resolution. Further, reproduction is performed by magnetization of the recording layer magnetizing the main magnetic pole, and magnetization of the main magnetic pole being detected by the auxiliary magnetic pole.
次に第２図は同ヘツドを、デイスク装置に応用
した場合を模式的に示したものである。１は主磁
極、２は補助磁極、５はデイスク、６は回転軸で
ある。同図下の円内の拡大図に示す様に、主磁極
の幅とほぼ等しい幅を有する記録トラツク７が形
成される。 Next, FIG. 2 schematically shows the case where the same head is applied to a disk device. 1 is a main magnetic pole, 2 is an auxiliary magnetic pole, 5 is a disk, and 6 is a rotating shaft. As shown in the enlarged view of the circle at the bottom of the figure, a recording track 7 having a width approximately equal to the width of the main magnetic pole is formed.
実際に補助磁極励磁型ヘツドを磁気記録装置に
用いる場合にも、従来の磁気ヘツドと同様にオフ
トラツク時のSN比の低下が問題となる。即ち、
第３図に示す様に、ある記録トラツクについて、
最大ｄのオフトラツクがあるとすると、最悪の場
合主磁極が８の位置にあつて記録し、次にこの記
録トラツクの書きかえを９の位置で行ない、これ
を８の位置で再生するということになり、幅ｄの
領域１０から再生される旧信号がノイズとなる。
これを回避するため、通常、記録・再生を行う磁
気ヘツドの両側に、消磁専用のヘツドを設け、記
録時に記録トラツクの両側を消磁し、旧信号のは
み出し部分１０を消去することが行なわれる。特
にフロツピー・デイスクでは媒体の膨張、収縮等
によるオフ・トラツクが大きく高い信頼性を保証
するSN比を得るためには、消磁ヘツドが不可欠
となつている。 Even when an auxiliary magnetic pole excitation type head is actually used in a magnetic recording device, the same problem as with conventional magnetic heads is that the S/N ratio decreases during off-track. That is,
As shown in Figure 3, for a certain recording track,
Assuming that there is an off-track of maximum d, in the worst case the main magnetic pole will record at position 8, then rewrite this recording track at position 9, and reproduce it at position 8. Therefore, the old signal reproduced from the area 10 of width d becomes noise.
To avoid this, heads dedicated to degaussing are usually provided on both sides of the magnetic head that performs recording and reproduction, and both sides of the recording track are demagnetized during recording to erase the protruding portion 10 of the old signal. In particular, in floppy disks, off-track due to expansion and contraction of the medium is large, and in order to obtain a signal-to-noise ratio that guarantees high reliability, a degaussing head is essential.
第４図は従来のフロツピー・デイスク装置に用
いられている磁気ヘツドの構成を示す概略図であ
る。従来の磁気ヘツドは、リング状のフエライト
コア１１に巻線１２を施こした記録再生ヘツドと
その両側に配置されたフエライト・コア１３と巻
線１４からなる消磁ヘツドとから成つている。図
中１５は記録再生を行なうギヤツプ、１６は消磁
を行うギヤツプである。この磁気ヘツドを媒体側
即ち同図中１７の矢印の側から見ると第５図の様
になつており、記録再生ヘツドのギヤツプ１５で
記録しながら、消磁ヘツドのギヤツプ１６で直流
磁界を発生させ、記録トラツクの両側を消磁して
いる。 FIG. 4 is a schematic diagram showing the structure of a magnetic head used in a conventional floppy disk device. A conventional magnetic head consists of a recording/reproducing head having a ring-shaped ferrite core 11 and a winding 12, and a demagnetizing head having a ferrite core 13 and a winding 14 disposed on both sides thereof. In the figure, 15 is a gap for recording and reproducing, and 16 is a gap for demagnetizing. When this magnetic head is viewed from the medium side, that is, the side indicated by the arrow 17 in the figure, it looks as shown in Fig. 5. While recording is performed using the gap 15 of the recording/reproducing head, a DC magnetic field is generated using the gap 16 of the degaussing head. , both sides of the recording track are demagnetized.
さて、補助磁極励磁型ヘツドに、消磁ヘツドの
機能を付加する場合、第４図の様なリング型の消
磁ヘツドを主磁極の両側に配置する方法、あるい
は、消磁ヘツドとして補助磁極励磁型ヘツド等の
垂直形ヘツドを用いる方法などが考えられるが、
これらの構成では構造が複雑で製造が比較的困難
であり、かつ磁気ヘツドの小型化には不適当であ
る。 Now, when adding the function of a demagnetizing head to an auxiliary magnetic pole excitation type head, there is a method of arranging ring-shaped demagnetizing heads on both sides of the main magnetic pole as shown in Fig. 4, or an auxiliary magnetic pole excitation type head etc. is used as the demagnetizing head. One possible method is to use a vertical head, but
These configurations are complex, relatively difficult to manufacture, and unsuitable for miniaturizing magnetic heads.
本発明は、消磁専用のヘツドを排し上記構成の
欠点を克服した新らしい磁気ヘツドを提供するも
のである。 The present invention provides a new magnetic head that eliminates the demagnetizing head and overcomes the drawbacks of the above structure.
第６図は本発明による磁気ヘツドを説明するた
めの図で、本発明による磁気ヘツドの構成例であ
る。同図ａは平面図、ｂは正面図である。以下の
説明では媒体は同図の右側方向に走行するものと
する。再生出力を取り出す巻線２１を先端の極く
近傍まで施こした主磁極部例えば主磁極１の両端
に、図示したようにサイド磁極１８を設け、主磁
極とサイド磁極の媒体進行下流側で記録が行われ
る主磁極１とサイド磁極１８のエツジ、即ちトレ
ーリング・エツジが有限な角度θをなす様にす
る。サイド磁極１８は高透磁率磁性体からなる。
そして、主磁極及びサイド磁極と、記録用巻線４
を施こした補助磁極２とを対向させる。 FIG. 6 is a diagram for explaining the magnetic head according to the present invention, and shows an example of the structure of the magnetic head according to the present invention. Figure a is a plan view, and figure b is a front view. In the following description, it is assumed that the medium travels in the right direction in the figure. As shown in the figure, side magnetic poles 18 are provided at both ends of the main magnetic pole section, for example, the main magnetic pole 1, in which the winding 21 for extracting the reproduction output is applied to the very vicinity of the tip, and recording is performed on the downstream side of the main magnetic pole and the side magnetic poles in which the medium travels. The edges of the main magnetic pole 1 and the side magnetic poles 18, ie, the trailing edges, at which this occurs are made to form a finite angle θ. The side magnetic pole 18 is made of a high permeability magnetic material.
Then, the main magnetic pole, the side magnetic pole, and the recording winding 4
The auxiliary magnetic pole 2 is placed opposite to the auxiliary magnetic pole 2.
本発明による磁気ヘツドにおいては主磁極部と
補助磁極部の間を走行する媒体に対し、第１図と
同様に記録を行う。この際、主磁極両側のサイド
磁極の存在によつて、媒体上の記録パターンは第
７図の様になる。即ち、主磁極１による記録領域
１９の両側にサイド磁極１８によつて、θだけ傾
いて記録された領域２０が存在する。 In the magnetic head according to the present invention, recording is performed on a medium running between the main magnetic pole part and the auxiliary magnetic pole part in the same manner as shown in FIG. At this time, due to the presence of side magnetic poles on both sides of the main magnetic pole, the recording pattern on the medium becomes as shown in FIG. That is, on both sides of the recording area 19 formed by the main magnetic pole 1, there are areas 20 recorded by the side magnetic poles 18 at an angle of θ.
次に再生は第６図の様に主磁極１の先端の極く
近くに例えば薄膜形成技術によつて形成した巻線
２１によつて行う。この方式によると、第１図の
様に主磁極１の磁化を補助磁極２の巻線で検出す
る方式より再生効率を高めることが可能である。 Next, reproduction is performed using a winding 21 formed very close to the tip of the main pole 1 by, for example, a thin film forming technique, as shown in FIG. According to this method, it is possible to improve the reproducing efficiency compared to the method of detecting the magnetization of the main magnetic pole 1 using the winding of the auxiliary magnetic pole 2 as shown in FIG.
この様に主磁極によつて第７図の記録トラツク
（主磁極による記録領域１９）を再生すると、主
磁極が再生時のオフ・トラツクのためサイド磁極
で記録された領域２０にかかつても、領域２０の
情報はアジマス損失のため再生されない。即ち領
域２０は再生時には消磁領域と同等に作用する。 In this way, when the main magnetic pole reproduces the recorded track (recorded area 19 by the main magnetic pole) in FIG. Information in region 20 is not reproduced due to azimuth loss. That is, the region 20 acts in the same manner as a demagnetizing region during reproduction.
この様に、本発明によれば消磁用の巻線を設け
て消磁用の電流を流す必要はなく。記録電流によ
つて信号を記録するのと同時に記録トラツクの両
側を消磁したのと同等の効果を得ることができ
る。このため、巻線付きの消磁ヘツドを用いる場
合に比べて構造が容易であり、小型化及び製造が
容易である。また消磁のための回路も不要であ
る。 In this manner, according to the present invention, there is no need to provide a demagnetizing winding and to flow a demagnetizing current. It is possible to obtain an effect equivalent to demagnetizing both sides of a recording track at the same time as recording a signal using a recording current. Therefore, the structure is simpler than the case where a degaussing head with a wire is used, and it is easier to downsize and manufacture. Further, a circuit for demagnetization is not required.
第１図は補助磁極励磁型ヘツドの説明図。第２
図は補助磁極励磁型ヘツドを磁気デイスク装置に
応用した場合の説明図。第３図はヘツドのオフ・
トラツクの影響を説明するための図。第４図、第
５図は従来のフロツピー・デイスク装置の磁気ヘ
ツドの構造を示す図。第６図は本発明の磁気ヘツ
ドの構成の一例を示す図。同図ａは平面図、ｂは
正面図。第７図は本発明の磁気ヘツドによる記録
トラツクの説明図。
１……主磁極、２……補助磁極、３……記録
層、４……巻線、５……デイスク、６……回転
軸、７……記録領域、８，９……主磁極位置、１
０……旧信号の記録領域、１１……記録再生ヘツ
ドのコア、１２，１４……巻線、１３……消磁ヘ
ツドのコア、１５……記録再生ヘツドのギヤツ
プ、１６……消磁ヘツドのキヤツプ、１７……媒
体との接触面を示す矢印、１８……サイド磁極、
１９……主磁極による記録領域、２０……サイド
磁極による記録領域、２１……巻線。
FIG. 1 is an explanatory diagram of an auxiliary magnetic pole excitation type head. Second
The figure is an explanatory diagram when an auxiliary magnetic pole excitation type head is applied to a magnetic disk device. Figure 3 shows the head off/off state.
Diagram for explaining the influence of tracks. 4 and 5 are diagrams showing the structure of a magnetic head of a conventional floppy disk device. FIG. 6 is a diagram showing an example of the configuration of the magnetic head of the present invention. Figure a is a plan view, and b is a front view. FIG. 7 is an explanatory diagram of a recording track by the magnetic head of the present invention. 1... Main magnetic pole, 2... Auxiliary magnetic pole, 3... Recording layer, 4... Winding wire, 5... Disk, 6... Rotating shaft, 7... Recording area, 8, 9... Main magnetic pole position, 1
0... Old signal recording area, 11... Core of recording/reproducing head, 12, 14... Winding, 13... Core of degaussing head, 15... Gap of recording/reproducing head, 16... Cap of degaussing head. , 17...Arrow indicating the contact surface with the medium, 18...Side magnetic pole,
19... Recording area by main magnetic pole, 20... Recording area by side magnetic pole, 21... Winding wire.
Claims (1)
部とからなる磁気ヘツドにおいて、 前記主磁極部は、薄膜状の主磁極とこの主磁極
に施された再生用巻線とを有し、 前記補助磁極部は、補助磁極とこの補助磁極に
施された記録用巻線とを有し、 前記主磁極とは離れてこの主磁極の両端の外周
に、この主磁極に対して傾斜したサイド磁極を配
置したことを特徴とする磁気ヘツド。[Scope of Claims] 1. A magnetic head consisting of a main magnetic pole part and an auxiliary magnetic pole part facing each other with a medium in between, the main magnetic pole part comprising a thin film-like main pole and a reproduction winding applied to the main pole. The auxiliary magnetic pole part has an auxiliary magnetic pole and a recording winding applied to the auxiliary magnetic pole, and the main magnetic pole is placed on the outer periphery of both ends of the main magnetic pole apart from the main magnetic pole. A magnetic head characterized in that side magnetic poles are arranged at an angle to the magnetic head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8711582A JPS58203612A (en) | 1982-05-21 | 1982-05-21 | magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8711582A JPS58203612A (en) | 1982-05-21 | 1982-05-21 | magnetic head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58203612A JPS58203612A (en) | 1983-11-28 |
| JPH0440769B2 true JPH0440769B2 (en) | 1992-07-06 |
Family
ID=13905951
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8711582A Granted JPS58203612A (en) | 1982-05-21 | 1982-05-21 | magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58203612A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0139018B1 (en) * | 1983-03-22 | 1990-06-13 | Sony Corporation | Magnetic transducer head assembly having a single magnetic pole type for perpendicular mode recording |
| US4945438A (en) * | 1987-04-24 | 1990-07-31 | Fuji Photo Film Co., Ltd. | Combined magnetic head |
| US7079344B2 (en) * | 2004-11-30 | 2006-07-18 | Hitachi Global Storage Technologies Netherlands B.V. | Magnetic recording disk drive with data written and read as cross-track magnetizations |
-
1982
- 1982-05-21 JP JP8711582A patent/JPS58203612A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58203612A (en) | 1983-11-28 |
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