JPS62177714A - Magnetic head - Google Patents
Magnetic headInfo
- Publication number
- JPS62177714A JPS62177714A JP1963686A JP1963686A JPS62177714A JP S62177714 A JPS62177714 A JP S62177714A JP 1963686 A JP1963686 A JP 1963686A JP 1963686 A JP1963686 A JP 1963686A JP S62177714 A JPS62177714 A JP S62177714A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- gap
- films
- recording
- thin film
- 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
- 230000005291 magnetic effect Effects 0.000 title claims abstract description 136
- 239000010409 thin film Substances 0.000 claims abstract description 29
- 230000004907 flux Effects 0.000 claims abstract description 20
- 230000035699 permeability Effects 0.000 claims abstract description 8
- 239000003302 ferromagnetic material Substances 0.000 claims abstract description 4
- 230000005294 ferromagnetic effect Effects 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000010408 film Substances 0.000 abstract description 14
- 239000000696 magnetic material Substances 0.000 abstract description 9
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 6
- 239000000463 material Substances 0.000 abstract description 5
- 238000000034 method Methods 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 3
- 239000000956 alloy Substances 0.000 abstract description 3
- 229910052759 nickel Inorganic materials 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 2
- 229910003271 Ni-Fe Inorganic materials 0.000 abstract 1
- 229910052681 coesite Inorganic materials 0.000 abstract 1
- 229910052906 cristobalite Inorganic materials 0.000 abstract 1
- 239000000377 silicon dioxide Substances 0.000 abstract 1
- 235000012239 silicon dioxide Nutrition 0.000 abstract 1
- 229910052682 stishovite Inorganic materials 0.000 abstract 1
- 229910052905 tridymite Inorganic materials 0.000 abstract 1
- 238000007666 vacuum forming Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910000702 sendust Inorganic materials 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000005476 soldering 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
- G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Heads (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、磁気ヘッドに関し、特にＶＴＲ用等の磁気ヘ
ッドに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head, and particularly to a magnetic head for a VTR or the like.
第７図は従来の磁気ヘッドを示す図であり、図において
、ｌａ、ｌｂは一対のフェライ［−磁気コア半体、３は
ＳｉＯ□よりなる磁気ギヤツブ、１０はコイル、２０は
摺動面である。FIG. 7 is a diagram showing a conventional magnetic head. In the figure, la and lb are a pair of ferrite core halves, 3 is a magnetic gear made of SiO□, 10 is a coil, and 20 is a sliding surface. be.
また第８図は第７図に示す磁気ヘッドをその摺動面２０
の側から見た図である。FIG. 8 shows the magnetic head shown in FIG. 7 on its sliding surface 20.
This is a diagram seen from the side.
次に動作について説明する。まず記録時には、コイル１
０に記録電流を流し、ギャップ３からの漏れ磁束によっ
て磁気記録媒体に記録を行なう。Next, the operation will be explained. First, when recording, coil 1
A recording current is passed through the gap 3, and recording is performed on the magnetic recording medium by leakage magnetic flux from the gap 3.
ここでコイル１０に流す電流が同じ場合、ギャップ３の
ギャップ間隔が広い方が記録効率がよい。Here, when the current flowing through the coil 10 is the same, the wider the gap interval of the gap 3, the better the recording efficiency.
一方、再生時には、磁気記録媒体からの磁界をギャップ
３でひろい、コイル１０に再生電圧を発生させる。On the other hand, during reproduction, the magnetic field from the magnetic recording medium is spread through the gap 3, causing the coil 10 to generate a reproduction voltage.
ここで高密度磁気記録を行なう場合、記録波長が短くな
れば、再生ギャップ損失が大きくなるため、ギャップ３
のギャップ間隔を狭くする必要がある。When performing high-density magnetic recording here, the shorter the recording wavelength, the greater the reproduction gap loss, so the gap 3
It is necessary to narrow the gap interval.
また高密度磁気記録を行なう場合、磁気記録媒体として
は、大きな再生電圧を得るため、高磁束密度、高抗磁力
の磁気テープが選ばれる。Further, when performing high-density magnetic recording, a magnetic tape with high magnetic flux density and high coercive force is selected as the magnetic recording medium in order to obtain a large reproduction voltage.
〔発明が解決しようとする問題点〕
このように記録密度を上げる場合には、磁気ヘッドのギ
ャップ間隔を狭くし、記録媒体として高磁束密度、高抗
磁力の磁気テープを使用するのが−ｍ的であるが、従来
の磁気ヘッドでは、ギヤノブ間隔を狭くすると記録効率
が低くなり、又高抗磁力の磁気テープを使用するとへン
ドコアが飽和するために十分な記録が行なえなかった。[Problems to be solved by the invention] In order to increase the recording density in this way, it is important to narrow the gap distance of the magnetic head and use a magnetic tape with high magnetic flux density and high coercive force as the recording medium. However, in conventional magnetic heads, recording efficiency decreases when the gear knob interval is narrowed, and when a magnetic tape with high coercive force is used, the magnetic head core becomes saturated and sufficient recording cannot be performed.
この発明は上記のような問題点を解消するためになされ
たもので、再生ギャップ損失を小さくできるとともに、
高抗磁力の磁気テープに対して十分な記録が行なえる磁
気ヘッドを得ることを目的としている。This invention was made to solve the above-mentioned problems, and it is possible to reduce reproduction gap loss, and
The object of the present invention is to obtain a magnetic head that can perform sufficient recording on a magnetic tape with high coercive force.
そこでこの発明は、強磁性体よりなる一対の磁気コア半
体を突き合わせて磁気ギャップを形成してなる磁気ヘッ
ドにおいて、上記磁気コア半体の接合面に真空薄膜形成
技術により飽和磁束密度が小さくかつ透磁率が高い磁性
薄膜を形成したものである。Accordingly, the present invention provides a magnetic head in which a pair of magnetic core halves made of ferromagnetic material are butted against each other to form a magnetic gap, in which the saturation magnetic flux density is small and A magnetic thin film with high magnetic permeability is formed.
この発明においては、再生時には上記磁性薄膜がヘッド
コアとして作用し、ヘッドギャップが狭くなって短波長
領域での再生ギャップ損失が小さくなり、−大記録時に
は上記磁性薄膜が磁気飽和を起こしてギャップとして作
用し、ヘッドギャップが広くなってギャップからの漏れ
磁束が大きくなり、記録効率が向上し、高抗磁力の磁気
記録媒体に対しても十分な記録が行なえる。In this invention, during reproduction, the magnetic thin film acts as a head core, narrowing the head gap and reducing reproduction gap loss in the short wavelength region, and - during large recording, the magnetic thin film causes magnetic saturation and acts as a gap. However, since the head gap becomes wider, the leakage magnetic flux from the gap becomes larger, the recording efficiency improves, and sufficient recording can be performed even on a magnetic recording medium with high coercive force.
以下、本発明の実施例を図について説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図及び第２図は本発明の一実施例による磁気ヘッド
を示す。第１図において、ｌａ、ｌｂは強磁性体、例え
ばフェライトよりなる一対の磁気コア半体、３は例えば
５ｉＯ１よりなり、ギャップを構成する非磁性材、４ａ
、４ｂは飽和磁束密度が小さく、例えば５００Ｇ以下で
あり、かつ透磁率が高い磁性材料（例えばＮｉ−Ｆｅ合
金Ｎｉ３０％前後又はＭｇ−フェライトなど）の磁性薄
膜である。1 and 2 show a magnetic head according to an embodiment of the present invention. In FIG. 1, la and lb are a pair of magnetic core halves made of a ferromagnetic material, such as ferrite; 3 is a nonmagnetic material made of, for example, 5iO1, forming the gap; 4a
, 4b is a magnetic thin film made of a magnetic material having a low saturation magnetic flux density, for example, 500 G or less, and a high magnetic permeability (for example, Ni--Fe alloy of around 30% Ni or Mg-ferrite).
また第２図は本実施例における磁気ヘッドを磁気記録媒
体との摺動面２０の側から見た図である。FIG. 2 is a view of the magnetic head in this embodiment viewed from the side of the sliding surface 20 with respect to the magnetic recording medium.
まず本実施例における磁気ヘッドの製造方法を簡単に説
明する。First, a method for manufacturing the magnetic head in this embodiment will be briefly explained.
本実施例の磁気ヘッドを製造する場合、第１図に示す一
対の磁気コア半体１ａ、ｌｂの突き合せ面に平面研磨加
工を行ない、この磁気コア半体１ａ、ｌｂの突き合せ面
上にスパッタリング、イオンブレーティング、蒸着等の
薄膜形成技術により磁性薄膜４ａ、４ｂを形成する。こ
のとき磁性薄膜４ａ、４ｂの（膜厚は、０．２μｍ以下
、例えば０．１ μｍとする。次にこの磁性薄膜４ａ、
４ｂ上にスパッタリング、蒸着等の薄膜形技術により非
磁性材３を形成する。このとき磁性薄膜４ａ、４ｂ上の
非磁性材３の膜厚は例えば０．１μｍづつとする。次い
で、これらの加工を施した一対の磁気コア半体１ａ、−
１ｂを突き合せ、ガラスモールド。When manufacturing the magnetic head of this embodiment, the abutting surfaces of the pair of magnetic core halves 1a and lb shown in FIG. The magnetic thin films 4a and 4b are formed by a thin film forming technique such as sputtering, ion blasting, or vapor deposition. At this time, the thickness of the magnetic thin films 4a and 4b is 0.2 μm or less, for example, 0.1 μm.
A non-magnetic material 3 is formed on the non-magnetic material 4b by a thin film technique such as sputtering or vapor deposition. At this time, the thickness of the non-magnetic material 3 on the magnetic thin films 4a and 4b is, for example, 0.1 μm each. Next, a pair of magnetic core halves 1a, −
Match 1b and make a glass mold.
銀蝋づけなどの手法により固定し、こうして本実施例の
磁気ヘッドを製造することができる。The magnetic head of this embodiment can be manufactured in this way by fixing by a method such as silver soldering.
次に本実施例における磁気ヘッドの動作について説明す
る。Next, the operation of the magnetic head in this embodiment will be explained.
この発明に係る磁気ヘッドにおいては、再生時には、磁
性薄膜４ａ、４ｂを通過する磁束の磁束密度が小さいた
め、磁性薄膜４ａ、４ｂは高透磁率の磁気コアとして作
用し、磁気ギャップ長は非磁性材３の膜厚つまり０．２
μｍとなる。In the magnetic head according to the present invention, during reproduction, since the magnetic flux density of the magnetic flux passing through the magnetic thin films 4a, 4b is small, the magnetic thin films 4a, 4b act as magnetic cores with high magnetic permeability, and the magnetic gap length is The film thickness of material 3 is 0.2
It becomes μm.
一方、記録時には、磁性薄膜４ａ、４ｂを通過する磁束
の磁束密度が大きくなるため、磁性薄膜４ａ、４ｂは磁
気飽和を起こし、はとんど磁性を示さなくなり、ギャッ
プ材として作用する。この場合の磁気ギャップ長は非磁
性材３の膜厚と磁性薄膜４ａ、４ｂの薄膜を加えたもの
であり、０．４μｍとなる。On the other hand, during recording, the magnetic flux density of the magnetic flux passing through the magnetic thin films 4a, 4b increases, so that the magnetic thin films 4a, 4b undergo magnetic saturation, hardly exhibiting magnetism, and act as gap materials. The magnetic gap length in this case is the thickness of the non-magnetic material 3 plus the thickness of the magnetic thin films 4a and 4b, and is 0.4 μm.
このように再生時においては、磁気ギャップ長は非磁性
材３の膜厚０．２μｍと等しい寸法となるため、再生ギ
ャップ損失が小さくなる。また記録時においては、ヘッ
ドギャップ長は非磁性材３の膜ＪＷと磁性薄膜４ａ、４
ｂの膜厚とを加えた厚さ０．４μｍと等しい寸法となる
ため、ギャップからの漏れ磁束が大きくなり、記録効率
が向上する。In this manner, during reproduction, the magnetic gap length is equal to the film thickness of the non-magnetic material 3 of 0.2 μm, so that the reproduction gap loss is reduced. Also, during recording, the head gap length is between the film JW of the non-magnetic material 3 and the magnetic thin films 4a and 4.
Since the size is equal to the thickness of 0.4 μm including the film thickness b, leakage magnetic flux from the gap increases and recording efficiency improves.
そのため高抗磁力の（５ｆ気記録媒体に記録する場−合
においても、磁気コアｌａ、ｌｂが磁気飽和を起こすこ
となく、十分に記録を行なうことができる。Therefore, even when recording on a high coercive force (5f) recording medium, sufficient recording can be performed without magnetic saturation of the magnetic cores la and lb.
なお、上記実施例では飽和磁束密度が小さくかつ透磁率
が高い磁性薄膜４ａ、４ｂを両方の磁気コア半体１ａ、
ｌｂの接合面に形成したが、第３図あるいは第４図に示
すように上記磁性薄膜４ａまたは４ｂを磁気コア半体１
ａまたは１ｂの片方だけに形成してもよく、こ−の場合
にはその膜厚を０．４μｍ以下とすればよい。In the above embodiment, the magnetic thin films 4a and 4b having low saturation magnetic flux density and high magnetic permeability are used in both magnetic core halves 1a,
The magnetic thin film 4a or 4b is formed on the joint surface of the magnetic core half 1 as shown in FIG. 3 or 4.
It may be formed only on one side of a or 1b, and in this case, the film thickness may be 0.4 μm or less.
また、上記実施例では磁性薄膜４ａ、４ｂの膜厚がそれ
ぞれ０．１μｍであったが、これは必ずしも０．ＩＩｊ
ｍである必要はない。また磁性薄膜４ａと磁性薄膜４ｂ
の膜厚が異なってもよい。Further, in the above embodiment, the thickness of each of the magnetic thin films 4a and 4b was 0.1 μm, but this is not necessarily 0.1 μm. IIj
It does not have to be m. Moreover, the magnetic thin film 4a and the magnetic thin film 4b
may have different film thicknesses.
また、上記実施例では狭トラツク加工を、はどこしてな
いが、第５図に示すように狭トラ・ツク加工をほどこし
てもよい。なお第５図中、２はガラスである。Further, although the narrow track processing is not performed in the above embodiment, narrow track processing may be performed as shown in FIG. In addition, in FIG. 5, 2 is glass.
さらに、上記実施例では磁気コア半体としてフェライト
単体を用いたが、これは第６図に示すように、接合面に
高飽和磁束密度の強磁性金属′Ｆ！４膜（例えば、セン
ダスト合金、又はアモルファス合金など）５ａ、５ｂを
形成しであるものであってもよい。Furthermore, in the above embodiment, a single ferrite was used as the magnetic core half, but as shown in FIG. 6, this is a ferromagnetic metal with a high saturation magnetic flux density 'F! 4 films (for example, sendust alloy or amorphous alloy) 5a and 5b may be formed.
またさらに、上記実施例では磁気コア半体１ａ。Furthermore, in the above embodiment, the magnetic core half body 1a.
１ｂとして、フェライトを用いたが、これは強磁性金属
材料（例えばセンダスト合金、又はアモルファス合金な
ど）を用いてもよい。Although ferrite is used as 1b, a ferromagnetic metal material (for example, sendust alloy or amorphous alloy) may also be used.
以上のように、この発明に係る磁気ヘッドによれば、記
録時と再生時においてヘッドギャップ長が変化するよう
に構成したので、高抗磁力の磁気記録媒体に対しても十
分な記録ができ、また再生ギャップ損失を小さくでき、
その結果裔密度の磁気記録再生に適した磁気ヘッドが得
られる効果がある。As described above, according to the magnetic head according to the present invention, since the head gap length is configured to change during recording and reproduction, sufficient recording can be performed even on a magnetic recording medium with high coercive force. In addition, playback gap loss can be reduced,
As a result, a magnetic head suitable for magnetic recording and reproducing at a descendant density can be obtained.
第１図はこの発明の一実施例による磁気ヘッドの斜視図
、第２図は上記磁気ヘッドを摺動面倒より見た図、第３
図、第４図、第５図、第６図は各々本発明の他の実施例
による磁気ヘッドを摺動面側より見た図、第７図は従来
の磁気ヘッドの斜視図、第８図は従来の磁気ヘッドを摺
動面側より見た図である。
図中、ｌａ、ｌｂは磁気コア半体、３は非磁性材よりな
る磁気ギャップ、４ａ、４ｂは飽和磁束密度が小さくか
つ透磁率が高い磁性薄膜。
なお図中同一符号は同−又は相当部分を示す。FIG. 1 is a perspective view of a magnetic head according to an embodiment of the present invention, FIG. 2 is a view of the magnetic head seen from the sliding surface, and FIG.
4, 5, and 6 are views of magnetic heads according to other embodiments of the present invention viewed from the sliding surface side, FIG. 7 is a perspective view of a conventional magnetic head, and FIG. 8 is a perspective view of a conventional magnetic head. is a diagram of a conventional magnetic head viewed from the sliding surface side. In the figure, la and lb are magnetic core halves, 3 is a magnetic gap made of a non-magnetic material, and 4a and 4b are magnetic thin films with low saturation magnetic flux density and high magnetic permeability. Note that the same reference numerals in the figures indicate the same or equivalent parts.
Claims (8)
せて磁気ギャップを形成してなる磁気ヘッドにおいて、 上記磁気コア半体の接合面に真空薄膜形成技術により飽
和磁束密度が小さくかつ透磁率が高い磁性薄膜を形成し
たことを特徴とする磁気ヘッド。(1) In a magnetic head in which a pair of magnetic core halves made of ferromagnetic material are butted against each other to form a magnetic gap, the saturation magnetic flux density is low and magnetic permeability is low due to vacuum thin film formation technology on the bonding surface of the magnetic core halves. A magnetic head characterized by forming a magnetic thin film with high magnetic properties.
々形成されていることを特徴とする特許請求の範囲第１
項記載の磁気ヘッド。(2) Claim 1, characterized in that the magnetic thin film is formed on each joint surface of both the magnetic core halves.
The magnetic head described in Section 1.
に形成されていることを特徴とする特許請求の範囲第１
項記載の磁気ヘッド。(3) Claim 1, wherein the magnetic thin film is formed on the joint surface of the one magnetic core half.
The magnetic head described in Section 1.
を特徴とする特許請求の範囲第２項記載の磁気ヘッド。(4) The magnetic head according to claim 2, wherein the thickness of the magnetic thin film is 0.2 μm or less.
を特徴とする特許請求の範囲第３項記載の磁気ヘッド。(5) The magnetic head according to claim 3, wherein the thickness of the magnetic thin film is 0.4 μm or less.
ることを特徴とする特許請求の範囲第４項または第５項
記載の磁気ヘッド。(6) The magnetic head according to claim 4 or 5, wherein the magnetic thin film has a saturation magnetic flux density of 500G or less.
ていることを特徴とする特許請求の範囲第１項記載の磁
気ヘッド。(7) The magnetic head according to claim 1, wherein the magnetic core half is formed of a ferromagnetic oxide.
れていることを特徴とする特許請求の範囲第１項記載の
磁気ヘッド。(8) The magnetic head according to claim 1, wherein the magnetic core half is formed of a ferromagnetic metal material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1963686A JPS62177714A (en) | 1986-01-30 | 1986-01-30 | Magnetic head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1963686A JPS62177714A (en) | 1986-01-30 | 1986-01-30 | Magnetic head |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62177714A true JPS62177714A (en) | 1987-08-04 |
Family
ID=12004699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1963686A Pending JPS62177714A (en) | 1986-01-30 | 1986-01-30 | Magnetic head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62177714A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02105309A (en) * | 1988-10-13 | 1990-04-17 | Mitsubishi Electric Corp | Thin film magnetic head |
-
1986
- 1986-01-30 JP JP1963686A patent/JPS62177714A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02105309A (en) * | 1988-10-13 | 1990-04-17 | Mitsubishi Electric Corp | Thin film magnetic head |
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