JPH022207B2 - - Google Patents
Info
- Publication number
- JPH022207B2 JPH022207B2 JP55066188A JP6618880A JPH022207B2 JP H022207 B2 JPH022207 B2 JP H022207B2 JP 55066188 A JP55066188 A JP 55066188A JP 6618880 A JP6618880 A JP 6618880A JP H022207 B2 JPH022207 B2 JP H022207B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- medium
- magnetic pole
- recording
- head
- 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 - Lifetime
Links
- 239000010408 film Substances 0.000 claims description 19
- 230000004907 flux Effects 0.000 claims description 16
- 230000005415 magnetization Effects 0.000 claims description 16
- 238000004804 winding Methods 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 7
- 238000010992 reflux Methods 0.000 claims description 4
- 239000010409 thin film Substances 0.000 claims description 2
- 229910000889 permalloy Inorganic materials 0.000 description 10
- 230000005284 excitation Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 208000028341 floppy head Diseases 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 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
Description
【発明の詳細な説明】
本発明は垂直磁化記録において、ヘツドのまわ
りに磁路を設けて閉磁路を形成せしめ、書き込み
効率および読み出し効率を大幅に改善した垂直磁
化記録ヘツドに関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a perpendicular magnetization recording head in which a magnetic path is provided around the head to form a closed magnetic path, thereby greatly improving write efficiency and read efficiency.
従来の磁気記録は通常記録媒体の面に沿つた方
向の磁化を利用している。 Conventional magnetic recording typically utilizes magnetization along the plane of the recording medium.
例えば第１図に示すように、基板１の表面に磁
性層２を設け、フエライトヘツド３に巻付けられ
た導線４に信号電流を流したとき、ヘツド３の狭
いギヤツプから漏洩した磁束が磁性層２を経て、
例えば矢印の向きのビツト磁化を行う。このと
き、ヘツド３を微小位置変化させながらビツト磁
化させた時、各ビツトの境界において磁化方向の
対向する場所が発生するから、そこでは自己減衰
が大きくなる。そのため高密度記録を達成するに
は磁束量を小さくして、自己減衰磁界を抑制する
ことが必要である。しかしこの磁束量は再生出力
の大きさを決定するものであり、高密度記録と大
再生出力とは相反関係にあり、記録密度に限界が
ある。 For example, as shown in FIG. 1, when a magnetic layer 2 is provided on the surface of a substrate 1 and a signal current is passed through a conductor 4 wound around a ferrite head 3, the magnetic flux leaking from the narrow gap of the head 3 is absorbed by the magnetic layer. After 2,
For example, bit magnetization is performed in the direction of the arrow. At this time, when the bits are magnetized while changing the position of the head 3 minutely, there are locations where the magnetization directions are opposite at the boundaries of each bit, so that self-attenuation becomes large at those locations. Therefore, in order to achieve high-density recording, it is necessary to reduce the amount of magnetic flux and suppress the self-attenuating magnetic field. However, the amount of magnetic flux determines the magnitude of the reproduction output, and high-density recording and large reproduction output are in a contradictory relationship, and there is a limit to the recording density.
そこで、近年この限界を超えるために、第２図
に示すような膜面に対して垂直方向に異方性を持
つた垂直記録媒体５に対し、主磁極（パーマロイ
膜）６を垂直方向に配設した主磁極ヘツド７と前
記媒体５をはさんで反対側に補助磁極８を対向さ
せ、かつ導線９を複数回巻きつけて構成して、媒
体層に垂直磁化する記録用ヘツドである。 In recent years, in order to overcome this limit, a main magnetic pole (permalloy film) 6 has been disposed perpendicularly to a perpendicular recording medium 5 having anisotropy perpendicular to the film surface as shown in FIG. This recording head is constructed by having a main magnetic pole head 7 and an auxiliary magnetic pole 8 facing on the opposite side with the medium 5 in between, and winding a conductive wire 9 a plurality of times to magnetize perpendicularly to the medium layer.
しかし、このようなヘツドでは巻線９に信号電
流が流れて発生した磁束が主磁極６へ流れる場合
に、第３図に示すように磁束の外部への洩れ（50
〜70％）が大きいため、書き込み効率、および読
み出し効率が十分でないという欠点があつた。 However, in such a head, when the signal current flows through the winding 9 and the magnetic flux generated flows to the main magnetic pole 6, the magnetic flux leaks to the outside (50
(up to 70%), the disadvantage was that write efficiency and read efficiency were insufficient.
本発明の目的は、書き込み読み出し用磁極のま
わりを三次元的に完全に覆う閉磁路を作り、外部
への磁束の洩れをなくす事により、ヘツドの書き
込みおよび読み出し効率を改善した記録ヘツドを
提供するにある。 An object of the present invention is to provide a recording head that improves the writing and reading efficiency of the head by creating a closed magnetic path that completely surrounds the writing and reading magnetic pole three-dimensionally and eliminating leakage of magnetic flux to the outside. It is in.
本発明の特徴は膜面に対して垂直方向に異方性
を持つた垂直記録媒体に対し、媒体膜面に対して
垂直方向に置かれた磁極から磁束を該媒体面に入
射して磁気記録するヘツドであつて、前記磁極の
媒体対向面側と反対の側で磁気的に結合し、かつ
前記磁極のまわりを媒体対向面まで三次元的に略
完全に覆うとともに、該磁極の媒体に対する面積
より広い断面積を持つ磁路を有する第１のヘツド
と、上記第１のヘツドと同様に磁極の媒体対向面
側と反対の側で磁気的に結合し、かつ前記磁極の
まわりを媒体対向面まで三次元的に略完全に覆う
とともに、該磁極の媒体に対する面積より広い断
面積を持つ磁路を有する第２のヘツドと、より構
成され、前記第１のヘツドと第２のヘツドは、前
記媒体を挟んで対向配置されて閉磁路が形成さ
れ、さらに、前記第１のヘツドまたは第２のヘツ
ドの何れか一方に記録再生用の巻線が施されてい
ることを特徴とする垂直磁化記録ヘツドおよび、
媒体基板上に磁性薄膜よりなる還流層を介して形
成された媒体面に垂直方向に異方性を持つた垂直
磁気記録媒体に対し、媒体膜面に対して垂直方向
に置かれた磁極から磁束を該媒体面に入射して磁
気記録するヘツドであつて、前記磁極の媒体対向
面側と反対の側で磁気的に結合し、かつ前記磁極
のまわりを媒体対向面まで三次元的に略完全に覆
うとともに、該磁極の媒体に対する面積より広い
断面積を持つ磁路を有する磁極と、該磁極に記録
再生用の巻線が施されて構成されていることを特
徴とする垂直磁化記録ヘツドによつて上述の目的
を達している。 The feature of the present invention is that a perpendicular recording medium having anisotropy in the direction perpendicular to the film surface is used for magnetic recording by injecting magnetic flux into the medium surface from a magnetic pole placed perpendicular to the medium film surface. a head that is magnetically coupled to the magnetic pole on the side opposite to the medium facing surface, and that substantially completely covers the magnetic pole three-dimensionally up to the medium facing surface, and that has an area of the magnetic pole with respect to the medium. A first head having a magnetic path with a wider cross-sectional area is magnetically coupled to the magnetic pole on the side opposite to the medium facing surface side of the magnetic pole, and the medium facing surface extends around the magnetic pole. a second head having a magnetic path that substantially completely covers the medium in three dimensions and has a larger cross-sectional area than the area of the magnetic pole with respect to the medium; Perpendicular magnetization recording characterized in that the heads are arranged opposite to each other with a medium in between to form a closed magnetic path, and further a winding for recording and reproducing is provided on either the first head or the second head. head and
For a perpendicular magnetic recording medium that has anisotropy in the direction perpendicular to the medium surface and is formed on the medium substrate through a reflux layer made of a magnetic thin film, magnetic flux is generated from a magnetic pole placed perpendicular to the medium film surface. A head that performs magnetic recording by injecting a magnetic field into the surface of the medium, which is magnetically coupled to the opposite side of the magnetic pole to the medium facing surface, and which extends almost completely three-dimensionally around the magnetic pole to the medium facing surface. A perpendicular magnetization recording head comprising: a magnetic pole having a magnetic path having a cross-sectional area larger than the area of the magnetic pole with respect to a medium; and a winding for recording and reproducing on the magnetic pole. Thus, the above objectives have been achieved.
以下、図面を用いて本発明を説明する。 The present invention will be explained below using the drawings.
第４図は本発明による垂直磁化記録ヘツドの１
実施例を説明するための断面図を示す。 FIG. 4 shows one of the perpendicular magnetization recording heads according to the present invention.
A sectional view for explaining an example is shown.
図において、膜面に対して垂直方向に異方性を
持つた垂直記録媒体に対し垂直方向に主磁極を設
け、該主磁極には書き込みを行うパーマロイ膜１
４を搭載し、まわりに媒体対向面まで三次元的に
完全に覆い且つ該媒体に対向する面積が上記磁極
の媒体に対向する面積より広い磁路ａを持たせて
いる。該主磁極１３と垂直記録媒体１２をはさん
で対向させて、同じようにまわりに媒体対向面ま
で三次元的に完全に覆い且つ該媒体に対向する面
積が上記磁極の媒体に対向する面積より広い磁路
ａを持たせた導体１５の巻かれた補助磁極１６を
設けて構成した補助磁極励磁方式の垂直磁化記録
ヘツドである。 In the figure, a main magnetic pole is provided perpendicularly to a perpendicular recording medium having anisotropy perpendicular to the film surface, and the permalloy film 1 on which writing is performed is provided on the main magnetic pole.
4 is mounted therearound, and has a magnetic path a that completely covers the medium facing surface three-dimensionally and whose area facing the medium is wider than the area facing the medium of the magnetic pole. The main magnetic pole 13 and the perpendicular recording medium 12 are placed opposite to each other, and are completely covered three-dimensionally up to the medium facing surface, and the area facing the medium is larger than the area of the magnetic pole facing the medium. This is a perpendicular magnetization recording head of the auxiliary magnetic pole excitation type, which is constructed by providing an auxiliary magnetic pole 16 wound with a conductor 15 having a wide magnetic path a.
補助磁極１６の巻線に信号電流を流すことによ
り、主磁極のパーマロイ膜１４先端が垂直記録媒
体１２に当つている面だけ書き込み、読み出しが
行われる。主磁極１３と補助磁極１６はまわりに
磁路ａを持ち、記録媒体の厚さだけしかギヤツプ
のない十分良好な閉磁路が形成されるので、第３
図で説明したような磁束の外部の洩れは極端に減
少し、書き込み効率、および読み出し効率を改善
することができる。 By passing a signal current through the winding of the auxiliary magnetic pole 16, writing and reading are performed only on the surface where the tip of the permalloy film 14 of the main magnetic pole is in contact with the perpendicular recording medium 12. The main magnetic pole 13 and the auxiliary magnetic pole 16 have a magnetic path a around them, and a sufficiently good closed magnetic path with a gap only by the thickness of the recording medium is formed.
External leakage of magnetic flux as explained in the figure is extremely reduced, and writing efficiency and reading efficiency can be improved.
また、パーマロイ膜１４の厚さを補助磁極１６
および主磁極１３の幅ｂより十分小さくして媒体
１２に高密度に書いた場合でも、補助磁極１６お
よび主磁極１３の幅ｂよりも、磁路ａの媒体面に
接する幅ｃを大きくとつているため、磁路ａの媒
体に対向する面積が上記補助磁極１６および主磁
極１３の媒体に対向する面積より大きく、従つて
磁路ａの媒体対向面で媒体１２に書き込んだり、
或いは読んだりするような事はない。 In addition, the thickness of the permalloy film 14 is adjusted to the auxiliary magnetic pole 16.
Even if the width b of the main magnetic pole 13 is sufficiently smaller than the width b of the main magnetic pole 13 to write on the medium 12 with high density, the width c of the magnetic path a in contact with the medium surface is set larger than the width b of the auxiliary magnetic pole 16 and the main magnetic pole 13. Therefore, the area of the magnetic path a facing the medium is larger than the area of the auxiliary magnetic pole 16 and the main magnetic pole 13 facing the medium.
Or, I don't have anything to read.
又、第５図イ，ロは主磁極１３側に巻線を施し
た主磁極励磁方式の垂直磁化記録ヘツドを示した
もので、巻線に信号電流が流れて発生した磁束を
より主磁極のパーマロイ１４に集中させることが
可能である。 5A and 5B show a main pole excitation type perpendicular magnetization recording head in which a winding is provided on the main pole 13 side, and the magnetic flux generated when a signal current flows through the winding is directed toward the main pole. It is possible to concentrate on permalloy 14.
以上の本発明は垂直フロツピイヘツド、又は磁
気テープ用ヘツドに採用すると最も効果がある。 The present invention described above is most effective when applied to a vertical floppy head or a magnetic tape head.
第６図イ，ロは本発明による補助磁極励磁方式
の両面垂直フロツピイヘツドへの適用した１実施
例を示した断面図である。 6A and 6B are sectional views showing an embodiment in which the auxiliary magnetic pole excitation method according to the present invention is applied to a double-sided vertical floppy head.
図は垂直記録媒体１２をはさんで両側から補助
磁極１６及び主磁極１３の対を対向させたもので
あり、加圧ジンバル１７により一定の加圧力にな
る様にされているものである。主磁極１３のパー
マロイ膜１４の厚さは0.7μｍ程であり、これによ
り20000BPIなる記録密度の書き込み、読み出し
が可能となつた。 The figure shows a pair of auxiliary magnetic poles 16 and main magnetic poles 13 facing each other from both sides with a perpendicular recording medium 12 in between, and a pressure gimbal 17 is used to maintain a constant pressure. The thickness of the permalloy film 14 of the main pole 13 is about 0.7 μm, which enables writing and reading at a recording density of 20,000 BPI.
また、この様な主磁極および補助磁極が１対以
上が磁路ａの円の中に入つたマルチトラツクのヘ
ツドも可能である。 Further, a multi-track head in which one or more pairs of such main magnetic poles and auxiliary magnetic poles are arranged within the circle of the magnetic path a is also possible.
なお、記録媒体の基板が厚い（２mm）場合は以
上の駆動方式では磁場を作ることができない。そ
こで第７図に示すように基板１８の片側だけに浮
上させ使うヘツドがある。第７図は両面用垂直磁
化記録ヘツドの断面図を示す。これはまわりに磁
路を持つた第４図同様の主磁極１３に導線１５が
巻かれた主磁極励磁方式で、補助磁極がなく、
Alよりなる基板１８とCo−Crよりなる磁性膜１
９との間に、パーマロイ膜２０の環流層を設けた
記録媒体と前記主磁極１３により構成したもので
ある。 Note that if the substrate of the recording medium is thick (2 mm), it is not possible to create a magnetic field with the above driving method. Therefore, as shown in FIG. 7, there is a head that is used by floating only on one side of the substrate 18. FIG. 7 shows a sectional view of a double-sided perpendicular magnetization recording head. This is a main pole excitation method in which a conducting wire 15 is wound around a main pole 13 similar to that shown in Fig. 4 with a magnetic path around it, but there is no auxiliary pole.
Substrate 18 made of Al and magnetic film 1 made of Co-Cr
The main magnetic pole 13 and a recording medium provided with a permalloy film 20 reflux layer between the magnetic pole 9 and the main magnetic pole 13.
この方式は主磁極１３のまわりに磁路ａを持
ち、パーマロイ膜の環流層２０とギヤツプない状
態で閉磁路が形成されるので、前述した実施例と
同じように磁束の外部への洩れなく書き込み効率
および読出し効率を改善できる。 This method has a magnetic path a around the main magnetic pole 13, and a closed magnetic path is formed with no gap between the permalloy film reflux layer 20 and the magnetic flux can be written without leaking to the outside, as in the previous embodiment. Efficiency and read efficiency can be improved.
以上実施例により本発明を説明したが、本発明
によれば書き込み読み出し用磁極のまわりを記録
媒体をはさんだ状態で三次元的に完全に覆う磁路
で包み込み、且つ該磁路が上記記録媒体を横切る
面積を上記磁極の記録媒体に対向する面積より大
きくすることによつて、外部への磁束の洩れを減
らし、書き込み効率および読み出し効率のよい垂
直磁化記録ヘツドが提供できる効果は大きい。 The present invention has been described above with reference to the embodiments. According to the present invention, a write/read magnetic pole is surrounded by a magnetic path that completely covers the recording medium in three dimensions, and the magnetic path covers the recording medium. By making the cross-sectional area of the magnetic pole larger than the area of the magnetic pole facing the recording medium, leakage of magnetic flux to the outside can be reduced, and a perpendicular magnetization recording head with good writing efficiency and reading efficiency can be provided.
第１図は従来の磁気記録装置を説明する斜視
図、第２図イ〜ハ、第３図は従来の垂直磁化記録
用ヘツドを説明するための断面図、第４図、第５
図は本発明による垂直磁化記録ヘツドの１実施例
を説明するための断面図で、うち第５図ロはＡ−
A′断面図を示し、第６図は本発明による垂直磁
化記録用ヘツドの適用の１実施例で、イはその断
面図、ロはＡ−A′断面図を示し、第７図は本発
明による垂直磁化記録ヘツドの別の実施例の断面
図。
図中、１２は垂直記録媒体、１３は主磁極、１
４はパーマロイ膜、１５は導体、１６は補助磁
極、１７は加圧ジンバル、１８は基板、１９は磁
性膜、２０はパーマロイ膜である。
FIG. 1 is a perspective view illustrating a conventional magnetic recording device, FIGS.
The figures are cross-sectional views for explaining one embodiment of the perpendicular magnetization recording head according to the present invention, of which FIG.
6 shows an example of application of the perpendicular magnetization recording head according to the present invention, A is a sectional view thereof, B is a sectional view taken along line A-A', and FIG. FIG. 3 is a cross-sectional view of another embodiment of a perpendicular magnetization recording head according to the present invention. In the figure, 12 is a perpendicular recording medium, 13 is a main magnetic pole, 1
4 is a permalloy film, 15 is a conductor, 16 is an auxiliary magnetic pole, 17 is a pressure gimbal, 18 is a substrate, 19 is a magnetic film, and 20 is a permalloy film.
Claims (1)
記録媒体に対し、媒体膜面に対して垂直方向に置
かれた磁極から磁束を該媒体面に入射して磁気記
録するヘツドであつて、 前記磁極の媒体対向面側と反対の側で磁気的に
結合し、かつ前記磁極のまわりを媒体対向面まで
三次元的に略完全に覆うとともに、該磁極の媒体
に対する面積より広い断面積を持つ磁路を有する
第１のヘツドと、 上記主磁極と同様に磁極の媒体対向面側と反対
の側で磁気的に結合し、かつ前記磁極のまわりを
媒体対向面まで三次元的に略完全に覆うととも
に、該磁極の媒体に対する面積より広い断面積を
持つ磁路を有する第２のヘツドより構成され、 前記第１と第２のヘツドは、前記媒体を挟んで
対向配置されて閉磁路が形成され、 さらに、前記第１および第２のヘツドの何れか
一方に記録再生用の巻線が施されていることを特
徴とする垂直磁化記録ヘツド。 ２ 媒体基板上に磁性薄膜よりなる還流層を介し
て形成された媒体面に垂直な方向に異方性を持つ
た垂直磁気記録媒体に対し、媒体膜面に対して垂
直方向に置かれた磁極から磁束を該媒体面に入射
して磁気記録するヘツドであつて、 前記磁極の媒体対向面側と反対の側で磁気的に
結合し、かつ前記磁極のまわりを媒体対向面まで
三次元的に略完全に覆うとともに、該磁極の媒体
に対する面積より広い断面積を持つ磁路を有する
磁極と、該磁極に記録再生用の巻線が施されて構
成されていることを特徴とする垂直磁化記録ヘツ
ド。[Claims] 1. For a perpendicular recording medium having anisotropy in the direction perpendicular to the film surface, magnetic flux is incident on the medium surface from a magnetic pole placed perpendicular to the medium film surface. A head for magnetic recording, which is magnetically coupled to the side of the magnetic pole opposite to the medium facing surface, and substantially completely covers the magnetic pole in a three-dimensional manner up to the medium facing surface; A first head having a magnetic path having a cross-sectional area larger than the area of the main magnetic pole is magnetically coupled to the magnetic pole on the side opposite to the medium facing surface side of the magnetic pole, and the medium facing surface extends around the magnetic pole. a second head having a magnetic path that substantially completely covers the magnetic field three-dimensionally and having a cross-sectional area larger than the area of the magnetic pole with respect to the medium; 1. A perpendicular magnetization recording head, characterized in that the heads are arranged facing each other to form a closed magnetic path, and further a recording/reproducing winding is provided on one of the first and second heads. 2. For a perpendicular magnetic recording medium that has anisotropy in a direction perpendicular to the medium surface and is formed on a medium substrate via a reflux layer made of a magnetic thin film, a magnetic pole placed perpendicular to the medium film surface. A head that performs magnetic recording by injecting magnetic flux from a magnetic flux into the medium surface, the magnetic flux being coupled magnetically on the side opposite to the medium facing surface of the magnetic pole, and three-dimensionally extending around the magnetic pole to the medium facing surface. Perpendicular magnetization recording characterized by comprising a magnetic pole having a magnetic path that covers the medium almost completely and has a cross-sectional area larger than the area of the magnetic pole with respect to the medium, and a winding for recording and reproducing on the magnetic pole. Head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6618880A JPS56163517A (en) | 1980-05-19 | 1980-05-19 | Vertical magnetization recording head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6618880A JPS56163517A (en) | 1980-05-19 | 1980-05-19 | Vertical magnetization recording head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56163517A JPS56163517A (en) | 1981-12-16 |
| JPH022207B2 true JPH022207B2 (en) | 1990-01-17 |
Family
ID=13308614
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6618880A Granted JPS56163517A (en) | 1980-05-19 | 1980-05-19 | Vertical magnetization recording head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56163517A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5737714A (en) * | 1980-08-20 | 1982-03-02 | Seiko Epson Corp | Magnetic head for vertical magnetic recording and reproduction |
| JP2502490B2 (en) * | 1983-08-08 | 1996-05-29 | 日本電信電話株式会社 | Perpendicular magnetic recording head |
| FR2559294B1 (en) * | 1984-02-03 | 1988-08-12 | Commissariat Energie Atomique | NOVEL MAGNETIC WRITE AND READ HEAD FOR PERPENDICULAR RECORDING AND MANUFACTURING METHOD THEREOF |
| US4663676A (en) * | 1985-09-13 | 1987-05-05 | International Business Machines | Return to zero vertical magnetic recording system |
| US5159511A (en) * | 1987-04-01 | 1992-10-27 | Digital Equipment Corporation | Biasing conductor for MR head |
| CA1334447C (en) * | 1988-08-03 | 1995-02-14 | Digital Equipment Corporation | Perpendicular anisotropy in thin film devices |
| US5089334A (en) * | 1988-08-03 | 1992-02-18 | Digital Equipment Corporation | Flux spreading thin film magnetic devices |
| US5085935A (en) * | 1988-08-03 | 1992-02-04 | Digital Equipment Corporation | Flux spreading thin film magnetic devices |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5255513A (en) * | 1975-10-30 | 1977-05-07 | Fujitsu Ltd | Magnetic head |
| JPS5440618A (en) * | 1977-09-06 | 1979-03-30 | Tdk Corp | Magnetic head |
| JPS6221178A (en) * | 1985-07-22 | 1987-01-29 | Konishiroku Photo Ind Co Ltd | Developing device |
-
1980
- 1980-05-19 JP JP6618880A patent/JPS56163517A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5255513A (en) * | 1975-10-30 | 1977-05-07 | Fujitsu Ltd | Magnetic head |
| JPS5440618A (en) * | 1977-09-06 | 1979-03-30 | Tdk Corp | Magnetic head |
| JPS6221178A (en) * | 1985-07-22 | 1987-01-29 | Konishiroku Photo Ind Co Ltd | Developing device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56163517A (en) | 1981-12-16 |
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