JPS6240606A - Magnetic erasing head - Google Patents

Magnetic erasing head

Info

Publication number
JPS6240606A
JPS6240606A JP17942385A JP17942385A JPS6240606A JP S6240606 A JPS6240606 A JP S6240606A JP 17942385 A JP17942385 A JP 17942385A JP 17942385 A JP17942385 A JP 17942385A JP S6240606 A JPS6240606 A JP S6240606A
Authority
JP
Japan
Prior art keywords
magnetic
groove
core
head
coil winding
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
JP17942385A
Other languages
Japanese (ja)
Inventor
Takayuki Kumasaka
登行 熊坂
Moichi Otomo
茂一 大友
Takeo Yamashita
武夫 山下
Juichi Morikawa
森川 寿一
Hideo Zama
座間 秀夫
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP17942385A priority Critical patent/JPS6240606A/en
Publication of JPS6240606A publication Critical patent/JPS6240606A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To obtain a high erasion efficiency by making a groove length of a core base piece having a winding groove longer than a groove length of a core base piece having no coil winding groove in an opposed surface of a recording medium, and forming a flank side of a magnetic tape to a magnetic field distribution of a gentle inclination. CONSTITUTION:A coil winding use groove 22 is formed in a base piece 21 of a flank side of a magnetic tape relative moving direction of an arrow A to an erasing head in core base pieces 20, 21 constituted of a metallic oxide magnetic material. Next, a notch groove for prescribing track width tw being narrower than a core width T is formed on an opposed surface side of a magnetic gap G of the base pieces 20, 21, and a groove length L2 of the core base piece having the winding groove 22 in lengths L1, L2 of this groove is lengthened and set to L1<L2. In this way, a flank side of a magnetic recording medium is formed to a magnetic field distribution of a gentle inclination, a signal to be erased is prevented from being re-recorded, and a magnetic erasing head having a high erasion efficiency can be realized.

Description

【発明の詳細な説明】 〔発明の利用分野〕 本発明は、磁気記録媒体に記録された信号を交流消去す
る磁気消去ヘッドに係り、特に高保磁力記録媒体に用い
て好適な磁気消去ヘッドに関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic erasing head for erasing signals recorded on a magnetic recording medium using alternating current, and particularly to a magnetic erasing head suitable for use with a high coercive force recording medium.

〔発明の背景〕[Background of the invention]

従来、例えばビデオテープレコーダ(一般的にVTRと
称す)用の消去ヘッドとして用いられている回転型磁気
消去ヘッドは、フライングイレーズヘッドと称され、磁
気記録媒体である磁気テープに磁気記録された信号を記
録トラック毎に交流消去できるようになっている。
A rotary magnetic erase head conventionally used as an erase head for video tape recorders (generally referred to as VTRs) is called a flying erase head, and is used to erase signals magnetically recorded on magnetic tape, which is a magnetic recording medium. It is now possible to erase each recorded track individually.

ところで、磁気テープに記録される信号の高密度化が要
求されるに従って、高保磁力の磁気記録媒体が用いられ
るようになり、この磁気記録媒体に記録されている信号
を消去するために、フェライトよりも飽和磁束密度の高
い磁性材料が用いられる。高飽和磁束密度を有する磁性
材料を求めようとすると一般的には金属磁性材料となり
、耐摩耗性が問題となる。そこで、耐摩耗性の優れたフ
ェライトとの組み合せで用いる複合材料型の磁性ヘッド
が多数提案されている。なお、この種の磁気ヘットに関
連するものは例えば特開昭51−14708号、特開昭
54−96013号、特開昭55−58823号、特開
昭56−1.24112号等が挙げられる。
By the way, as higher density of signals recorded on magnetic tape is required, magnetic recording media with high coercive force are being used, and in order to erase the signals recorded on these magnetic recording media, ferrite A magnetic material with a high saturation magnetic flux density is also used. When trying to obtain a magnetic material with a high saturation magnetic flux density, a metal magnetic material is generally used, and wear resistance becomes a problem. Therefore, many composite material magnetic heads have been proposed that are used in combination with ferrite, which has excellent wear resistance. Incidentally, examples related to this type of magnetic head include JP-A-51-14708, JP-A-54-96013, JP-A-55-58823, JP-A-56-1.24112, etc. .

その多くは記録・再生用に提案されたものである。この
ような磁気ヘッドも磁気ギャップを広くすることで、消
去用ヘッドに適用できる。しかし、記録および再生を同
一ヘッドで行なうために、記録に必要な特性の他に再生
効率の高いヘッド構造となっているため、構造的にも複
雑で製造コストも高いヘットとなってしまう。ところが
、磁気消去ヘットにおいては再生効率あるいは2種類の
磁気材料で構成した場合の接合部での擬似ギャップ作用
をあまり問題としない。そのため、主に消去効率が高く
、製造方法の容易なヘッド構造が要求される。
Many of them have been proposed for recording and playback. Such a magnetic head can also be applied to an erasing head by widening the magnetic gap. However, since recording and reproduction are performed using the same head, the head structure has not only characteristics necessary for recording but also high reproduction efficiency, resulting in a head that is structurally complex and expensive to manufacture. However, in the case of a magnetic erase head, reproduction efficiency or a pseudo gap effect at a junction when composed of two types of magnetic materials is not much of an issue. Therefore, a head structure that has high erasing efficiency and is easy to manufacture is required.

このような磁気消去ヘッドは、一般的に、第6図に示す
ような磁気ヘッドが知られている。第6図は磁気ヘッド
の記録媒体対向面の平面図および主磁路形成面の平面図
を示す。この磁気消去ヘッドはフェライトコア素片10
,11の磁気ギャップ対向面側にセンダスト等の高飽和
磁束密度の磁性薄膜12.12’ を形成し、トラック
幅1wを規定するための切り欠き溝を設け、非磁性ギャ
ップ材13を配して、前記切り欠き溝にガラス材14を
充填し、接合一体化している。
As such a magnetic erase head, a magnetic head as shown in FIG. 6 is generally known. FIG. 6 shows a plan view of the recording medium facing surface of the magnetic head and a plan view of the main magnetic path forming surface. This magnetic erase head has 10 ferrite core pieces.
, 11, a magnetic thin film 12, 12' having a high saturation magnetic flux density such as Sendust is formed on the side facing the magnetic gap, a cutout groove is provided to define a track width 1w, and a non-magnetic gap material 13 is arranged. , the cutout groove is filled with a glass material 14 and integrally bonded.

第6図に示す構成とすることで、ギャップ部に充分な磁
界強度を得ることができ、メタルテープのような高保磁
力媒体に記録された信号を充分消去することが可能であ
る。しか−し、上記磁気ヘッドの磁気ギャップから発生
する磁界強度の分布aは第8図に示すような特性となり
、磁気ギャップの位置に対して、磁気テープ相対移動方
向の逃げ側(矢印Aで示す方向)での磁界分布が急峻と
なっている。このため、消去周波数の信号が磁気テープ
上に再記録されてしまう現象が発生する。このように、
従来の磁気消去ヘッドは消去効率が充分でないという問
題を有している。
By adopting the configuration shown in FIG. 6, it is possible to obtain sufficient magnetic field strength in the gap portion, and it is possible to sufficiently erase signals recorded on a high coercive force medium such as a metal tape. However, the distribution a of the magnetic field intensity generated from the magnetic gap of the magnetic head has a characteristic as shown in FIG. direction), the magnetic field distribution is steep. For this reason, a phenomenon occurs in which the erase frequency signal is re-recorded on the magnetic tape. in this way,
Conventional magnetic erasing heads have a problem of insufficient erasing efficiency.

また、第6図に示す磁気ヘッドはコア素片10゜11の
磁気ギャップ対向面側に磁性薄膜12゜12′ を形成
した後、狭トラツク幅規定用の切り欠き溝を形成するた
めコア素片10および11と磁性薄膜12および12′
との境界部15および15′がはく離するという問題が
発生する。また、切り欠き溝にガラス14を充填する際
にガラスが境界部に侵入し効率を著しく低減する。さら
に、切り欠き溝形成の際にエツジ部にパリが発生するた
め磁気ギャップの寸法精度が得られない等の問題がある
In addition, in the magnetic head shown in FIG. 6, after forming a magnetic thin film 12° 12' on the side of the core piece 10° 11 facing the magnetic gap, the core piece 10° 11 is removed in order to form a cutout groove for defining a narrow track width. 10 and 11 and magnetic thin films 12 and 12'
A problem arises in that the boundary portions 15 and 15' between the two are separated. Moreover, when the glass 14 is filled into the cutout groove, the glass enters the boundary portion, significantly reducing efficiency. Further, there is a problem that dimensional accuracy of the magnetic gap cannot be obtained because burrs occur at the edge portions when forming the notch grooves.

上記問題を解決した磁気ヘッドとして、特開昭60−8
9807号および特開昭60−89806号がある。そ
の−例を示す磁気ヘッドの記録媒体対向面の平面図を第
7図に示す。この磁気ヘッドにおいてはトラック幅規定
用切り欠き溝をトラック幅に対して傾斜させ台形部を残
すことによって加工時に磁性薄膜のはく離を防止する方
法が提案されている。しかし、磁性薄膜のはく離に対し
てはまだ十分とはいえない。
As a magnetic head that solved the above problem, JP-A-60-8
No. 9807 and JP-A-60-89806. FIG. 7 is a plan view of the recording medium facing surface of a magnetic head showing an example of this. In this magnetic head, a method has been proposed in which the track width defining notch groove is inclined with respect to the track width to leave a trapezoidal portion to prevent peeling of the magnetic thin film during processing. However, it is still not sufficient to prevent peeling of magnetic thin films.

〔発明の目的〕[Purpose of the invention]

本発明の目的は高い保磁力を有する磁気記録媒体に記録
された信号を消去するのに適した高い消去効率を持つ磁
気消去ヘッドを提供することにある。さらに、製造方法
が容易で、量産に適したヘッド構造を提供する。
An object of the present invention is to provide a magnetic erasing head with high erasing efficiency and suitable for erasing signals recorded on a magnetic recording medium having high coercive force. Furthermore, the present invention provides a head structure that is easy to manufacture and suitable for mass production.

〔発明の概要〕[Summary of the invention]

本発明を達成するための磁気消去ヘッドは、一方にコイ
ル巻線用溝を有する金属酸化物磁性材料よりなる一対の
コア素片の磁気ギャップ形成面側に高飽和磁束密度の磁
性薄膜を形成し、該一対のコア素片を非磁性ギャップ材
を介して接合してなる磁気消去ヘッドにおいて、前記一
対のコア素片が磁気ギャップ形成面側にコア幅より狭い
トラック幅を形成するための切り欠き溝を有し、該切り
欠き溝が記録媒体対向面においてコイル巻線溝をもたな
いコア素片の溝長さLlよりコイル巻線溝を有するコア
素片の溝さL2を長くしたことを特徴とする。
A magnetic erasing head for achieving the present invention has a magnetic thin film having a high saturation magnetic flux density formed on the magnetic gap forming surface side of a pair of core pieces made of a metal oxide magnetic material having a coil winding groove on one side. , in a magnetic erasing head formed by joining the pair of core pieces through a non-magnetic gap material, the pair of core pieces have a notch on the magnetic gap forming surface side for forming a track width narrower than the core width; The groove length L2 of the core piece having a coil winding groove is longer than the groove length Ll of the core piece having no coil winding groove on the surface facing the recording medium. Features.

さらに、一対のコア素片のうちコイル巻線溝のないコア
素片の磁気ギャップ形成面側に磁性薄膜を形成してなる
ことを特徴とする特 また、一対のコア素片が接合されてなる磁気消去ヘッド
は、磁気記録媒体の逃げ側にコイル巻線溝を有するコア
素片が位置するように配置される。
Furthermore, a magnetic thin film is formed on the magnetic gap forming surface side of the core piece having no coil winding groove among the pair of core pieces. The magnetic erasing head is arranged such that a core piece having a coil winding groove is located on the relief side of the magnetic recording medium.

〔発明の実施例〕[Embodiments of the invention]

以下、本発明の一実施例を図面によって説明する。 An embodiment of the present invention will be described below with reference to the drawings.

第1図は1本発明に係る磁気消去ヘッドの磁気媒体対向
面の平面図および主磁路形成面の平面図である。図中、
一対のコア素片20,21は金属酸化物磁性材料(例え
ば、M、−Znフェライト、あるいはN□−Znフェラ
イト)で構成される。
FIG. 1 is a plan view of a magnetic medium facing surface and a main magnetic path forming surface of a magnetic erasing head according to the present invention. In the figure,
The pair of core pieces 20 and 21 are made of a metal oxide magnetic material (for example, M, -Zn ferrite, or N□-Zn ferrite).

コア素片20,21のうち、消去ヘッドに対する矢印A
の磁気テープ相対移動方向の逃げ側のコア素片21にコ
イル巻線用の溝22が形成されている。そして、コア素
片20,21の磁気ギャップGの対向面側にコア幅Tよ
り狭いトラック幅twを規定するための切り欠き溝が形
成される。この切り欠き溝の長さLl、L2はコイル巻
線溝22を有するコア素片の溝長さL2を長くし、L、
<L2とする。例えば、Llを0.05〜0.2mmと
し、L2をL工の長さの約1.5〜2倍にすると好適で
ある6L□を0.05+n+a以下にするとクロストー
クが問題となり、また、L2をQ 、4 mm以上にす
ると絞り部の磁気抵抗が大きくなり、消去電流が必要以
上に大きくなり好ましくない。一方、コイル巻線溝の角
度θは30〜80°が好ましく、より好ましくは40〜
70″である。θを30’以下にすると漏洩磁束が多く
なり消去効率が低下する。また、80°以上にするとギ
ャップ深さdが浅くなった場合に磁気抵抗が高くなり好
ましくない。
Among the core pieces 20 and 21, arrow A toward the erase head
A groove 22 for coil winding is formed in the core piece 21 on the relief side in the direction of relative movement of the magnetic tape. Then, a notch groove for defining a track width tw narrower than the core width T is formed on the opposing surface side of the magnetic gap G of the core pieces 20 and 21. The lengths Ll and L2 of the notch grooves lengthen the groove length L2 of the core piece having the coil winding groove 22;
<L2. For example, it is preferable to set Ll to 0.05 to 0.2 mm and L2 to be approximately 1.5 to 2 times the length of L. If 6L□ is set to 0.05+n+a or less, crosstalk becomes a problem, and If L2 is Q, 4 mm or more, the magnetic resistance of the aperture portion will increase, and the erase current will become larger than necessary, which is not preferable. On the other hand, the angle θ of the coil winding groove is preferably 30 to 80 degrees, more preferably 40 to 80 degrees.
70''. If θ is less than 30', leakage magnetic flux will increase and the erasing efficiency will decrease. If it is more than 80 degrees, the magnetic resistance will increase when the gap depth d becomes shallow, which is not preferable.

次に、23は高飽和磁束密度の磁性薄膜であり、飽和磁
束密度が7KG以上のセンダストあるいは非晶質磁性合
金膜からなっており、一般的にはスパッタリングで形成
される。磁性薄膜23はコイル巻線溝のないコア素片2
0側に形成するのが好ましい。すなわち、磁気記録媒体
進入側のコア素片に形成することによって、磁気ギャッ
プ進入側で磁界強度の分布が急峻となる。また、磁性薄
膜23はコア素片20の磁気ギャップ形成面および側面
に形成することによって磁性薄膜のはく離を防止してい
る。
Next, 23 is a magnetic thin film with a high saturation magnetic flux density, which is made of Sendust or an amorphous magnetic alloy film with a saturation magnetic flux density of 7 KG or more, and is generally formed by sputtering. The magnetic thin film 23 is a core piece 2 without a coil winding groove.
It is preferable to form it on the 0 side. That is, by forming the core piece on the magnetic recording medium entry side, the distribution of magnetic field strength becomes steep on the magnetic gap entry side. Further, the magnetic thin film 23 is formed on the magnetic gap forming surface and side surfaces of the core piece 20 to prevent peeling of the magnetic thin film.

上記のような磁気コア素片20,21は非磁性ギャップ
材G(例えば、8102′4膜)を介して。
The magnetic core pieces 20 and 21 as described above are connected via a non-magnetic gap material G (for example, 8102'4 film).

切り欠き部にガラス24を充填して接合一体化し磁気消
去ヘッドコアを得る。場合によっては磁気コア後部にガ
ラスだめ25で補強してもよい。
The cutout portion is filled with glass 24 and joined together to obtain a magnetic erasing head core. In some cases, the rear part of the magnetic core may be reinforced with a glass reservoir 25.

第2図は本発明の磁気消去ヘッドのギャップ周辺での磁
界強度分布をテープ相対移動方向距離を横軸に取り示し
たものである。すなわち、上記消去ヘッドは、ギャップ
部より発生する消去磁界の磁界強度が高く、またこの磁
界分布aが磁気テープ移動方向にギャップ位置に対して
非対称となっている。そして、磁気テープ相対移動方向
の逃げ側方向での強度分布aが、緩やかな傾斜の分布と
なっている。これは第1図の磁気コアにおいて進入側の
ギャップ近傍に高飽磁束密度の磁性薄膜23を有するた
めに磁気飽和を起すことなく強い磁界が発生し、逃げ側
はコイル巻線用の溝とトラック幅規定用の切り欠き溝に
よってギャップ近傍部の磁性体の体積が小さいことから
ギャップ近傍部から先に磁気飽和を起すことに起因する
。さらに、コイル巻線側のコア素片がフェライトのみで
構成されている場合はさらに顕著であるためその最適化
が必要となる。その影響を与える部分が、切り欠き溝の
長さL2であり、コイル巻線溝の角度りである。
FIG. 2 shows the magnetic field strength distribution around the gap of the magnetic erasing head of the present invention, plotting the distance in the tape relative movement direction on the horizontal axis. That is, in the erase head, the magnetic field strength of the erase magnetic field generated from the gap portion is high, and the magnetic field distribution a is asymmetrical with respect to the gap position in the magnetic tape moving direction. The intensity distribution a in the escape side direction in the direction of relative movement of the magnetic tape has a gentle slope. This is because the magnetic core shown in Figure 1 has a magnetic thin film 23 with a high saturation magnetic flux density near the gap on the entrance side, so a strong magnetic field is generated without causing magnetic saturation, and the escape side has grooves and tracks for coil winding. This is because the volume of the magnetic material in the vicinity of the gap is small due to the width-defining notch, so that magnetic saturation occurs first in the vicinity of the gap. Furthermore, if the core piece on the coil winding side is made of only ferrite, the problem is even more noticeable, and therefore optimization is required. The parts that have this effect are the length L2 of the notch groove and the angle of the coil winding groove.

第3図は本発明の第2の実施例を示す磁気コアの記録媒
体対向面および主磁路形成面の平面図である。以下、第
1図と同一箇所および同一材料は同一記号で記しである
。第3図においては、磁気記録媒体の進入側のコア素片
20のギャップ対向面側の形状を台形になるように切り
欠き溝を形成し、これに磁性薄膜23を形成した構造を
示す。
FIG. 3 is a plan view of a recording medium facing surface and a main magnetic path forming surface of a magnetic core showing a second embodiment of the present invention. Hereinafter, the same parts and materials as in FIG. 1 are indicated by the same symbols. FIG. 3 shows a structure in which a notch groove is formed so that the shape of the gap-opposing surface of the core piece 20 on the entrance side of the magnetic recording medium is trapezoidal, and a magnetic thin film 23 is formed therein.

このようにすることによって、磁気記録媒体進入側の磁
束効率を高めることができる。また、主磁路形成面も図
示のように変形することができる。
By doing so, the magnetic flux efficiency on the magnetic recording medium entrance side can be increased. Further, the main magnetic path forming surface can also be deformed as shown.

第4図は本発明の第3の実施例を示す磁気コアの記録媒
体対向面の平面図を示す。なお、主磁路形成面は省略し
である。第4図は磁気記録媒体の逃げ側のコア素片のギ
ャップ対向面側に台形の切り欠き溝を形成し、L 1<
 L 2として本発明の効果を得たものである。
FIG. 4 shows a plan view of the recording medium facing surface of a magnetic core showing a third embodiment of the present invention. Note that the main magnetic path forming surface is omitted. In FIG. 4, a trapezoidal notch groove is formed on the gap-opposing surface side of the core piece on the escape side of the magnetic recording medium, and L 1 <
The effect of the present invention was obtained as L2.

第5図は本発明の第4の実施例を示す磁気コアの記録媒
体対向面の平面図である。第5図は一対のコア素片20
,21の両方に磁性薄膜23゜2:3′ を形成した構
造を示す。この構造においてもトラック幅規定用切り欠
き溝長さLl< L2の条件を溝だせば本発明の効果を
得ることができる。
FIG. 5 is a plan view of the recording medium facing surface of a magnetic core showing a fourth embodiment of the present invention. Figure 5 shows a pair of core pieces 20
, 21 is shown with a magnetic thin film 23°2:3' formed thereon. Even in this structure, the effects of the present invention can be obtained by satisfying the condition that the track width defining notch groove length Ll<L2.

以上に述べた実施例は本発明の一例であるが、上記実施
例を示す第1図、第3図、第4図、第5図のそれぞれの
コア素片を互いに組み合せてもよ(A。
Although the embodiment described above is an example of the present invention, the core pieces shown in FIG. 1, FIG. 3, FIG. 4, and FIG. 5 showing the above embodiment may be combined with each other (A).

なお、本発明の磁気消去ヘッドは、VTR用の回転消去
ヘッドとして用いる以外に、固定型消去ヘッドとして用
いるようにしてもよい。
The magnetic erasing head of the present invention may be used not only as a rotating erasing head for a VTR but also as a fixed erasing head.

〔発明の効果〕〔Effect of the invention〕

以上説明したごとく本発明によれば、高保磁力を有する
磁気記録媒体に記録された信号を消去するのに充分な磁
界強度を得ることができるとともに、磁気記録媒体の逃
げ側に緩らかな傾斜を持つ磁界分布によって、消去され
るべき信号が再記録されるようなことはなく高い消去効
率を持つ磁気消去ヘッドを実現できる。
As explained above, according to the present invention, it is possible to obtain a magnetic field strength sufficient to erase signals recorded on a magnetic recording medium having a high coercive force, and to create a gentle slope on the escape side of the magnetic recording medium. Due to the magnetic field distribution, the signal to be erased is not re-recorded, and a magnetic erasing head with high erasing efficiency can be realized.

また、コア素片となる金属酸化物磁性材のギャップ対向
面側に形成された高飽和磁束密度の磁性薄膜がはく離し
ない構造となっているため、磁気ヘッドの製造歩留りも
高い。
Furthermore, since the magnetic thin film with a high saturation magnetic flux density formed on the side facing the gap of the metal oxide magnetic material serving as the core piece does not peel off, the manufacturing yield of the magnetic head is also high.

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

第1図、第3図、第4図ならびに第5図は本発明の磁気
消去ヘッドの一例を示す記録媒体対向面および主磁路形
成面の平面図、第2図は本発明の磁気消去ヘッドの磁界
分布を示す特性図、第6図。 第7図は従来の磁気消去ヘッドを示す記録媒体対向面お
よび主磁路形成面の平面図、第8図は従来の磁気消去ヘ
ッドの磁界強度分布を示す特性図である。 20.21・・・コア素片、22・・・コイル巻線用溝
、23.23’・・・磁性薄膜、24・・・ガラス、L
l。 L2・・・トラック幅規定用切り欠き溝、A・・・磁気
記録媒体の相対移動方向 第7図 舊2圀 テープJ目jJ負仏万1町距九1− 第3図 第4図
1, 3, 4, and 5 are plan views of a recording medium facing surface and a main magnetic path forming surface showing an example of the magnetic erasing head of the present invention, and FIG. 2 is a plan view of the magnetic erasing head of the present invention. FIG. 6 is a characteristic diagram showing the magnetic field distribution of . FIG. 7 is a plan view of the recording medium facing surface and the main magnetic path forming surface of a conventional magnetic erasing head, and FIG. 8 is a characteristic diagram showing the magnetic field strength distribution of the conventional magnetic erasing head. 20.21... Core piece, 22... Coil winding groove, 23.23'... Magnetic thin film, 24... Glass, L
l. L2... Notch groove for defining track width, A... Direction of relative movement of magnetic recording medium.

Claims (1)

【特許請求の範囲】 1、一方にコイル巻線用溝を有する金属酸化物磁性材料
よりなる一対のコア素片の磁気ギャップ形成面側に高飽
和磁束密度の磁性薄膜を形成し、該一対のコア素片を非
磁性ギャップ材を介して接合してなる磁気消去ヘッドに
おいて、前記一対のコア素片が磁気ギャップ形成面側に
コア幅より狭いトラック幅を形成するための切り欠き溝
を有し、該切り欠き溝が記録媒体対向面においてコイル
巻線溝のないコア素片の溝長さL_1よりコイル巻線溝
を有するコア素片の溝長さL_2を長くしたことを特徴
とする磁気消去ヘッド。 2、前記一対のコア素片のうちコイル巻線溝をもたない
コア素片の磁気ギャップ形成面側に磁性薄膜を形成して
なることを特徴とする特許請求の範囲第1項記載の磁気
消去ヘッド。
[Claims] 1. A magnetic thin film with a high saturation magnetic flux density is formed on the magnetic gap forming surface side of a pair of core pieces made of a metal oxide magnetic material having a coil winding groove on one side, In a magnetic erasing head formed by joining core pieces through a non-magnetic gap material, the pair of core pieces have a cutout groove on a magnetic gap forming surface side for forming a track width narrower than the core width. , a magnetic eraser characterized in that the notched groove has a groove length L_2 of a core piece having a coil winding groove longer than a groove length L_1 of a core piece without a coil winding groove on the surface facing the recording medium. head. 2. The magnetism according to claim 1, wherein a magnetic thin film is formed on the magnetic gap forming surface side of the core piece that does not have a coil winding groove among the pair of core pieces. erase head.
JP17942385A 1985-08-16 1985-08-16 Magnetic erasing head Pending JPS6240606A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17942385A JPS6240606A (en) 1985-08-16 1985-08-16 Magnetic erasing head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17942385A JPS6240606A (en) 1985-08-16 1985-08-16 Magnetic erasing head

Publications (1)

Publication Number Publication Date
JPS6240606A true JPS6240606A (en) 1987-02-21

Family

ID=16065601

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17942385A Pending JPS6240606A (en) 1985-08-16 1985-08-16 Magnetic erasing head

Country Status (1)

Country Link
JP (1) JPS6240606A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS632110A (en) * 1986-06-20 1988-01-07 Sanyo Electric Co Ltd Erasure magnetic head and its manufacture
JPH05121129A (en) * 1991-10-29 1993-05-18 Japan Aviation Electron Ind Ltd Slip ring type connector

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS632110A (en) * 1986-06-20 1988-01-07 Sanyo Electric Co Ltd Erasure magnetic head and its manufacture
JPH05121129A (en) * 1991-10-29 1993-05-18 Japan Aviation Electron Ind Ltd Slip ring type connector

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