JPS61188709A - Magnetic head - Google Patents

Magnetic head

Info

Publication number
JPS61188709A
JPS61188709A JP2909785A JP2909785A JPS61188709A JP S61188709 A JPS61188709 A JP S61188709A JP 2909785 A JP2909785 A JP 2909785A JP 2909785 A JP2909785 A JP 2909785A JP S61188709 A JPS61188709 A JP S61188709A
Authority
JP
Japan
Prior art keywords
magnetic head
magnetic
head body
flux density
saturation
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
Application number
JP2909785A
Other languages
Japanese (ja)
Inventor
Hidefumi Yamamoto
英文 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Renesas Semiconductor Manufacturing Co Ltd
Kansai Nippon Electric Co Ltd
Original Assignee
Renesas Semiconductor Manufacturing Co Ltd
Kansai Nippon Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Renesas Semiconductor Manufacturing Co Ltd, Kansai Nippon Electric Co Ltd filed Critical Renesas Semiconductor Manufacturing Co Ltd
Priority to JP2909785A priority Critical patent/JPS61188709A/en
Publication of JPS61188709A publication Critical patent/JPS61188709A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/40Protective measures on heads, e.g. against excessive temperature 
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/10Structure or manufacture of housings or shields for heads
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/133Structure or manufacture of heads, e.g. inductive with cores composed of particles, e.g. with dust cores, with ferrite cores with cores composed of isolated magnetic particles
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/127Structure or manufacture of heads, e.g. inductive
    • G11B5/187Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • G11B5/193Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features the pole pieces being ferrite or other magnetic particles

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)

Abstract

PURPOSE:To raise remarkably the saturation magnetic flux density, and also to eliminate the danger property which causes demagnetization due to seizure by a sliding friction, and an abnormal temperature rise, even in case when a magnetic head is slid with a recording medium, by attaching the magnetic head body to a cooling device which has been packed with a cooling medium. CONSTITUTION:As for a liquid nitrogen 2 being a cooling medium which has been packed completely in a closed space between the inside wall of a vacuum dewer 1 and a sealed wall 3, a liquid temperature is set to about 77 deg.K. A head body containing case 4 surrounded by the sealed wall 3 is fixed to a window part 5 provided on the center part, so that a magnetic head body 6 exposes the top surface having a magnetic gap. As for the magnetic head body 6, it is set to such a low temperature as about 77 deg.K, therefore, a saturation magnetic flux density Bs of a ferrite core rises by scores of %.

Description

【発明の詳細な説明】 庄1」Jl生肚分盟− この発明は、磁気記録を行う磁気ヘッド、特に高記録密
度が要求されるVTR等に使用できる磁気ヘッドに関す
るものである。
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a magnetic head that performs magnetic recording, and particularly to a magnetic head that can be used in VTRs and the like that require high recording density.

従速]支術− 従来よりVTRやコンピュータ等の磁気記録を行わせる
磁気ヘッドは、高透磁率、高飽和磁束密度、低抗磁力、
そして高周波特性や媒体に対する耐摩耗性等の特性が要
求される。したがって、その磁気へッドファは、周知の
通り磁性材料であり、その代表例としては、Mn−Zn
単結晶フェライトやセンダスト合金及・びアモルファス
合金がある。まずMn−Zn単結晶フェライトコア(以
下単にフェライトコアと記す)は、記録媒体の材質が、
以前から採用されて来た、針状ゲータイト粒子から得ら
れるγ−Fe2O3に適合するので賞月されているが、
飽和を磁束密度特性では、より一層の向上は困難とされ
ている。つぎに、センダスト合金及びアモルファス合金
コアは、媒体がFe−GoやFe−Go−Nt等を主組
成とする、メタル磁性粉使用の場合、フェライトコアが
適合しないのに対して、確実に適応するので、今後の実
用化が期待されている。その中で、センダスト合金は、
公知化されている通り、Fe−51−Ml等を主組成と
する合金であって、例えば、第7回日本応用磁気学会学
術講演概要集(1983・11.8PA−11,P12
3)や特開昭58−18916号公報等に紹介されてい
る。
Traditionally, magnetic heads used for magnetic recording in VTRs, computers, etc. have high magnetic permeability, high saturation magnetic flux density, low coercive force,
Further, characteristics such as high frequency characteristics and wear resistance against media are required. Therefore, the magnetic head is made of a magnetic material as is well known, and a typical example thereof is Mn-Zn.
There are single crystal ferrite, sendust alloy, and amorphous alloy. First, the Mn-Zn single crystal ferrite core (hereinafter simply referred to as ferrite core) has a recording medium made of
It has been praised because it is compatible with γ-Fe2O3 obtained from acicular goethite particles, which has been used for a long time.
It is considered difficult to further improve saturation in magnetic flux density characteristics. Next, Sendust alloy and amorphous alloy cores are definitely compatible with metal magnetic powder, where the medium has a main composition such as Fe-Go or Fe-Go-Nt, whereas ferrite cores are not compatible. Therefore, it is expected that it will be put into practical use in the future. Among them, Sendust alloy is
As is publicly known, it is an alloy whose main composition is Fe-51-Ml etc.
3) and Japanese Unexamined Patent Publication No. 18916/1983.

フェライトコアとセンダスト合金コアの具体的な諸性性
を比較すると、次の表1の通りである。
A comparison of the specific properties of the ferrite core and the sendust alloy core is shown in Table 1 below.

表1 ビデオヘッド用磁性材料 ロ (よ′  。占 ところで、上述した第1表から判るように、センダスト
合金コアは、フェライトコアに比べてビッカース硬度が
小さり、シたがって4′F11!耗性が劣る。また高周
波帯域における透磁率も低い欠点がある。しかも、セン
ダスト合金は、コアの巻線溝やトラック溝などの加工を
施す場合、フェライトよりも脆く、実用性の面でやや難
色がある。このような欠点があるにもかかわらず、セン
ダスト合金が高記録密度となるメタルテープ等に対する
磁気ヘッドに採用され始めた根拠は、フェライトに比べ
飽和磁束密度が圧倒的に高いからに尽きる。
Table 1 Magnetic materials for video heads By the way, as can be seen from Table 1 above, the Sendust alloy core has a lower Vickers hardness than the ferrite core, and therefore has a wear resistance of 4'F11! It also has the disadvantage of low magnetic permeability in the high frequency band.In addition, Sendust alloy is more brittle than ferrite when processing core winding grooves and track grooves, making it somewhat difficult to use in terms of practicality. Despite these drawbacks, the reason why Sendust alloy has begun to be used in magnetic heads for metal tapes with high recording densities is that it has an overwhelmingly higher saturation magnetic flux density than ferrite.

したがって、フェライトコアを用いても高飽和磁束密度
が得られればよい訳であるが、フェライトの材質改善は
困難であった。この発明は、以上の経緯があって、フェ
ライトコアの欠点是正を図った磁気ヘッドを提案するも
のである。
Therefore, even if a ferrite core is used, it is sufficient to obtain a high saturation magnetic flux density, but it has been difficult to improve the material quality of the ferrite. Based on the above background, the present invention proposes a magnetic head in which the drawbacks of the ferrite core are corrected.

口            ′        こ  
 のこの発明は、フェライトコアを従来と同様に用いて
形成した磁気ヘッド本体を、冷媒を充填した冷却装置に
取付けすることを提唱する。すなわち、この発明は、磁
気ヘッド本体自身は、従来より実績があるフェライトコ
アを採用し、冷却装置に取付けることによって、高飽和
磁束密度特性を得よ・うとする点に特徴がある。
Mouth
This invention proposes that a magnetic head body formed using a ferrite core in a conventional manner be attached to a cooling device filled with a coolant. That is, the present invention is characterized in that the magnetic head body itself uses a ferrite core, which has been used in the past, and is attached to a cooling device to obtain high saturation magnetic flux density characteristics.

作1− この発明では、冷却装置によって、磁気ヘンド本体が極
めて低い温度に設定されるので、飽和磁束密度が大幅に
上昇する。またこの発明では、磁気ヘッド本体が常時冷
却されているので、記録媒体と摺動させる場合でも、摺
動摩擦による焼き付きや、異常昇温か生じて減磁してし
まう危険性が排除できる。
Production 1 - In this invention, the temperature of the magnetic hend body is set to an extremely low temperature by the cooling device, so that the saturation magnetic flux density increases significantly. Further, in this invention, since the magnetic head main body is constantly cooled, even when sliding with a recording medium, it is possible to eliminate the risk of burning due to sliding friction or demagnetization due to abnormal temperature rise.

炎監外 第1図は、この発明の一実施例を説明する上で参照する
磁気ヘッドの概念図である。まず、1は、極めて低い温
度にする冷却装置の真空デユアである。2は、真空デユ
ア1の内壁と、密封壁3との間の密閉空間に完全に充填
された冷媒としての液体窒素で、液温を約77°Kに設
定したものである。
FIG. 1 is a conceptual diagram of a magnetic head to be referred to in explaining an embodiment of the present invention. First, 1 is a vacuum dure of a cooling device that brings the temperature to an extremely low temperature. 2 is liquid nitrogen as a refrigerant that is completely filled in the sealed space between the inner wall of the vacuum dure 1 and the sealing wall 3, and the liquid temperature is set to about 77°K.

4は、密封壁3に囲繞されたヘッド本体収納テープで、
中央部に設けられた窓部5に、磁気へノド本体6が磁気
ギャップを有する頂面を露出するように固定されている
。さて、磁気ヘッド本体6は、従来と同様なMn −Z
n単結晶フェライトコアを用いたもので、第2図に示す
通りの構造である。すなわち第2図で、7,8はコア半
休であり、巻線挿通窓9、巻線係止溝10.11を設け
、低融点ガラス12を接着材として接合したものである
。そして、磁気ヘッド本体6の曲面研磨された頂面13
上のほぼ中央部に、磁気ギャップ14が形成されている
4 is a head body storage tape surrounded by a sealing wall 3;
A magnetic nod main body 6 is fixed to a window 5 provided in the center so as to expose the top surface having a magnetic gap. Now, the magnetic head main body 6 is made of Mn-Z similar to the conventional one.
It uses an n single-crystal ferrite core and has a structure as shown in FIG. That is, in FIG. 2, cores 7 and 8 are half-open, provided with a winding insertion window 9, a winding locking groove 10, 11, and bonded with low melting point glass 12 as an adhesive. Then, the curved polished top surface 13 of the magnetic head main body 6
A magnetic gap 14 is formed approximately in the upper center.

また15は、コイル巻線である。Further, 15 is a coil winding.

以上構造概略を説明した磁気ヘッドは、冷却装置にて、
磁気ヘッド本体6が約776にという低温に設定されて
いるので、フェライトコアの飽和磁束密度Bsが、数十
%上昇する。この点は、第3図に示すように、Mn−Z
n単結晶フェライトコアの温度−飽和磁化特性曲線16
上の常温でのA点と、1000にでのB点との飽和磁化
Msを比べると、B点ではA点に対して約50%増加す
ることから判明する。
The magnetic head whose structure has been explained above is installed in a cooling device.
Since the magnetic head body 6 is set at a low temperature of about 776°C, the saturation magnetic flux density Bs of the ferrite core increases by several tens of percent. This point is important for Mn-Z, as shown in Figure 3.
Temperature-saturation magnetization characteristic curve 16 of n single crystal ferrite core
Comparing the saturation magnetization Ms at point A at normal temperature and point B at 1000 ℃ above, it is found that the saturation magnetization Ms increases by about 50% at point B compared to point A.

尚、上記実施例では、フェライトコアとしてMn−zn
単結晶フェライト、冷媒として液体窒素を掲げたが、こ
の発明ではその他に、ホットプレスフェライトとしたり
、エチレングリコール等を用いたりしてもよい。
In the above embodiment, Mn-zn is used as the ferrite core.
Although single crystal ferrite and liquid nitrogen are used as the refrigerant, in this invention, hot pressed ferrite, ethylene glycol, etc. may also be used.

光朋」峠l良 この発明によれば、従来よりのフエライトコアの欠点で
ある飽和磁束密度が低い点が是正されるので、メタルテ
ープ等の記録媒体にも十分対応でき、センダスト合金コ
アを用いなくても高密度記録が可能な磁気ヘッドが得ら
れる。またこの発明によれば、異常昇温によるコアの減
磁等の事故が回避でき、安定した動作をする磁気ヘッド
が期待できる。
According to this invention, the low saturation magnetic flux density, which is a drawback of conventional ferrite cores, can be corrected, so it is fully compatible with recording media such as metal tapes, and it can be used with sendust alloy cores. A magnetic head capable of high-density recording can be obtained even without this. Further, according to the present invention, accidents such as demagnetization of the core due to abnormal temperature rise can be avoided, and a magnetic head that operates stably can be expected.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は、この発明の一実施例を説明するための磁気ヘ
ッドの概念図、第2図は、その磁気ヘッド本体の斜視図
、第3図は、Mn−Zn単結晶フェライトの温度−飽和
磁化特性曲線図である。 1・・・・・・冷却装置(真空デユア)、2・・・・・
・冷媒(液体窒素)、 6・・・・・・磁気ヘッド本体。
FIG. 1 is a conceptual diagram of a magnetic head for explaining an embodiment of the present invention, FIG. 2 is a perspective view of the main body of the magnetic head, and FIG. 3 is a temperature-saturation diagram of Mn-Zn single crystal ferrite. It is a magnetization characteristic curve diagram. 1... Cooling device (vacuum dua), 2...
- Refrigerant (liquid nitrogen), 6...Magnetic head body.

Claims (1)

【特許請求の範囲】[Claims] フェライトコアを用いた磁気ヘッド本体を、冷媒を充填
した冷却装置に取付けしたことを特徴とする磁気ヘッド
A magnetic head characterized in that a magnetic head body using a ferrite core is attached to a cooling device filled with a refrigerant.
JP2909785A 1985-02-16 1985-02-16 Magnetic head Pending JPS61188709A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2909785A JPS61188709A (en) 1985-02-16 1985-02-16 Magnetic head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2909785A JPS61188709A (en) 1985-02-16 1985-02-16 Magnetic head

Publications (1)

Publication Number Publication Date
JPS61188709A true JPS61188709A (en) 1986-08-22

Family

ID=12266847

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2909785A Pending JPS61188709A (en) 1985-02-16 1985-02-16 Magnetic head

Country Status (1)

Country Link
JP (1) JPS61188709A (en)

Similar Documents

Publication Publication Date Title
US5270894A (en) MIG magnetic head structured to minimize pseudo-gap problem
KR910007871B1 (en) Magnetic head having a core of mn-zn-co ferrous ferrite
US5029032A (en) Magnetic head for high density recording
JPS61188709A (en) Magnetic head
US4568993A (en) Magnetic head
Mallinson The next decade in magnetic recording
JPH03131006A (en) Magnetic head
KR880001197B1 (en) Magnetic heads
JPS61194607A (en) Magnetic head
JPH0467245B2 (en)
JP2834261B2 (en) Composite magnetic head
JPS63187404A (en) Magnetic head
JPS6334710A (en) Magnetic head
JPH011115A (en) Magnetic head manufacturing method
JPS6220606B2 (en)
JP2763703B2 (en) Magnetic head
JPS6374107A (en) Magnetic head
JPS6215805A (en) Magnetic head
JPS61258325A (en) Magnetic head
JPH02177007A (en) Magnetic head
JPS58128019A (en) Video head for tape with high corecive force
JPS63285715A (en) Magnetic head
JPS6227442B2 (en)
JPH0358307A (en) Magnetic head
JPH08255308A (en) Production of composite magnetic head