JPH0770018B2 - Magnetic erase head - Google Patents
Magnetic erase headInfo
- Publication number
- JPH0770018B2 JPH0770018B2 JP60285527A JP28552785A JPH0770018B2 JP H0770018 B2 JPH0770018 B2 JP H0770018B2 JP 60285527 A JP60285527 A JP 60285527A JP 28552785 A JP28552785 A JP 28552785A JP H0770018 B2 JPH0770018 B2 JP H0770018B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- film
- erasing head
- core piece
- 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 - Fee Related
Links
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- Magnetic Heads (AREA)
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。Description: FIELD OF THE INVENTION The present invention relates to a magnetic erasing head for AC erasing a signal recorded on a magnetic recording medium, and more particularly to a magnetic erasing head suitable for use in a high coercive force recording medium.
従来、例えばVTR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。このような磁気消去ヘッドは、一般的に高保磁力
記録媒体である。例えばメタルテープ等の磁気テープ用
に開発された記録・再生用の磁気ヘッドの磁気ギャップ
を広くすることで、消去用ヘッドに適用できる。この種
ヘッドとして例えば、特開昭58-155513号がある。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
特性の他に再生効率の高いヘッド構造に設計してあり、
構造的にも複雑で製造コストも高価なヘッドとなってし
まう。ところが、磁気消去用ヘッドにおいては再生効率
あるいは２種類の磁性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。Conventionally, a rotary magnetic erasing head used as an erasing head for a VTR, for example, is called a flying erase head, and is capable of AC erasing a signal magnetically recorded on a magnetic tape as a magnetic recording medium for each recording track. Has become. Such a magnetic erasing head is generally a high coercive force recording medium. For example, by expanding the magnetic gap of a recording / reproducing magnetic head developed for a magnetic tape such as a metal tape, it can be applied to an erasing head. As this type of head, for example, there is JP-A-58-155513. However, in order to perform recording and reproduction with the same head, the head structure is designed to have high reproduction efficiency in addition to recording characteristics,
The head is structurally complicated and the manufacturing cost is high. However, in the magnetic erasing head, the reproducing efficiency or the pseudo-gap action at the joint portion when it is composed of two kinds of magnetic materials does not matter so much. Therefore, a head structure having a high erasing efficiency and an easy manufacturing method is mainly required.
このような磁気消去ヘッドは、一般的に、第３図に示す
ような磁気ヘッドが知られている。第３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10,1
1の磁気ギャップ対向面側に高飽和磁束密度の磁性薄膜1
2,12′を形成し、トラック幅Tw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 erasing head, a magnetic head as shown in FIG. 3 is generally known. FIG. 3 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 erasing head has a ferrite core piece 10,1
1 Magnetic thin film with high saturation magnetic flux density on the side facing the magnetic gap 1
2, 12 'are formed, a notch groove for defining the track width Tw is provided, a non-magnetic gap material 13 is arranged, and the notch groove is filled with a glass material 14 to integrally bond them.
第３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５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。With the structure shown in FIG. 3, a sufficient magnetic field strength can be obtained in the gap portion, and the signal recorded on the high coercive force medium such as a metal tape can be sufficiently erased. However, the distribution a of the magnetic field intensity generated from the magnetic gap of the magnetic head has the characteristics shown in FIG.
The magnetic field distribution on the relief side (the direction indicated by arrow A) in the relative movement direction of the magnetic tape is steep with respect to the position of the magnetic gap. Therefore, a phenomenon occurs in which the signal of the erasing frequency is re-recorded on the magnetic tape. As described above, the conventional magnetic head has a problem that the erasing efficiency is not sufficient.
また、第３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
トラッ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。Further, in the magnetic head shown in FIG. 3, after forming the magnetic thin films 12 and 12 'on the magnetic gap facing surfaces of the core pieces 10 and 11, the core pieces are formed to form the cutout grooves for narrow track width regulation.
Boundaries 15 and 10 between the magnetic thin films 12 and 12 'and 10 and 11 and
The problem arises that the 15 'peels off.
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
溝形成の際にエッジ部にバ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。Further, when the notch groove is filled with the glass 14, the glass penetrates into the boundary portion to significantly reduce the efficiency. Further, there is a problem that dimensional accuracy of the magnetic gap cannot be obtained because burrs are generated at the edge portion when the notch groove is formed.
上記問題を解決した磁気ヘッドとして、特開昭60-89807
号および特開昭60-89806号がある。その一例を示す磁気
ヘッドの記録媒体対向面の平面図を第４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 solves the above problems, Japanese Patent Application Laid-Open No. 60-89807
And JP-A-60-89806. FIG. 4 is a plan view of the recording medium facing surface of the magnetic head showing an example thereof. In this magnetic head, a method has been proposed in which the notch groove for defining the track width 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 cannot be said that it is sufficient for the peeling of the magnetic thin film.
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。It is an object of the present invention to provide a magnetic erasing head having a high erasing efficiency suitable for erasing a signal recorded on a magnetic recording medium having a high coercive force.
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、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アモルファス膜を形成すること
を特徴とする。A magnetic erasing head for achieving the present invention forms a magnetic thin film having a high saturation magnetic flux density on a 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 with a non-magnetic gap material, a cutout for forming the track width narrower than the core width on the magnetic gap forming surface side of the pair of core pieces. An amorphous film is formed on the magnetic gap forming surface side of a core piece having a groove and having no coil winding groove among the pair of core pieces.
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
素片が位置し、もう一方の磁気記録媒体進行側のコア素
片の磁気ギャップ形成面側にのみにアモルファス膜を形
成し、その上にギャップ材として非磁性酸化膜と非磁性
金属を形成し、トラック幅を形成するための切り欠き溝
をガラスで充填することを特徴とする磁気消去ヘッド。In a magnetic erasing head formed by joining a pair of core pieces, the core piece having a coil winding groove is located on the escape side of the magnetic recording medium, and the magnetic piece of the core piece on the advancing side of the other magnetic recording medium is located. An amorphous film is formed only on the gap forming surface side, a non-magnetic oxide film and a non-magnetic metal are formed on it as a gap material, and a notch groove for forming a track width is filled with glass. Magnetic erase head.
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、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1,2は金属酸化物磁性材料（Mn-Zn単結晶
フェライト）で構成される。コア素片1,2のうち消去動
作を行なう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２にコイル巻線用の溝３が
形成されている。そして、コア素片1,2の磁気ギャップ
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。FIG. 1 is a plan view of a magnetic medium facing surface and a main magnetic path forming surface of a magnetic erase head according to the present invention. In the figure,
The pair of core pieces 1 and 2 are composed of a metal oxide magnetic material (Mn-Zn single crystal ferrite). A groove 3 for coil winding is formed in the core piece 2 of the core pieces 1 and 2 on the escape side in the direction of relative movement of the magnetic tape with respect to the erasing head for erasing operation. 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 of the core pieces 1 and 2.
次に、４は高飽和磁束密度の磁性薄膜であり、スパッタ
リング法により形成された、Co-Nb-Zr3元系アモルファ
ス膜で約３μm1層である。Next, 4 is a magnetic thin film having a high saturation magnetic flux density, which is a Co—Nb—Zr ternary amorphous film formed by a sputtering method and has a thickness of about 3 μm 1.
次にアモルファス膜上に６で示される非磁性酸化膜SiO2
膜を約１μｍスパッタ法により形成し、その上７で示さ
れる非磁性金属膜としてCr膜を約1.8μｍ形成すること
により非磁性酸化膜と非磁性金属膜とでギャップを形成
する。Next, a non-magnetic oxide film SiO 2 indicated by 6 is formed on the amorphous film.
A film is formed by a sputtering method of about 1 μm, and a Cr film of about 1.8 μm is formed thereon as a nonmagnetic metal film 7 to form a gap between the nonmagnetic oxide film and the nonmagnetic metal film.
次にトラック幅を形成するための切り欠き部にガラス材
５を充填する。ここでこのガラス材料には次の特性が要
求される。アモルファス膜の結晶化温度を考慮して低融
点であること（作業温度で460℃以下）。ガラス充填時
に発生するクラックを防止するために熱膨張係数が低い
こと（α≦115×10-7／℃）。ガラス欠けやクラックを
考慮して破壊強度が高い材料が必要となる。以上の特性
を満足するガラスとして、V2O5:55〜65wt％，P2O5:15〜
25wt％，Sb2O3:6〜12wt％その他PbO,TL2O，Nb2O5組成か
らなる低融点（作業温度425℃〜445℃），熱膨張係数
（α:75〜85×10-7／℃）のガラス材を充点ガラスとし
て使用する。また実施例の２）としては、PbO:80〜85wt
％，B2O5:10〜15wt％その他SiO2，AL2O3の組成からなる
低融点ガラス（作業温度:450〜460℃，熱膨張係数:100
〜113×10-7／℃）を使用する場合もある。Next, the glass material 5 is filled in the notch for forming the track width. Here, the following characteristics are required for this glass material. A low melting point in consideration of the crystallization temperature of the amorphous film (460 ° C or less at working temperature). Low coefficient of thermal expansion (α ≦ 115 × 10 -7 / ° C) to prevent cracks generated during glass filling. A material having high fracture strength is required in consideration of glass breakage and cracks. As a glass satisfying the above characteristics, V 2 O 5 : 55 to 65 wt%, P 2 O 5 : 15 to
25wt%, Sb 2 O 3: 6~12wt% Other PbO, TL 2 O, Nb 2 O 5 a composition low melting point (working temperature 425 ℃ ~445 ℃), thermal expansion coefficient (α: 75~85 × 10 - (7 / ° C) glass material is used as full-filled glass. As Example 2), PbO: 80 to 85 wt
%, B 2 O 5 : 10〜15wt% Other low melting glass composed of SiO 2 and AL 2 O 3 (working temperature: 450〜460 ℃, thermal expansion coefficient: 100
~ 113 × 10 -7 / ° C) may be used.
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 described above, according to the present invention, it is possible to obtain a magnetic field strength sufficient for erasing a signal recorded on a magnetic recording medium having a high coercive force, and to provide a gentle inclination on the escape side of the magnetic recording medium. Due to the magnetic field distribution possessed, it is possible to realize a magnetic erase head having a high erase efficiency without re-recording a signal to be erased.
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としてアモ
ルファス膜を用いることで、金属酸化物磁性材との熱膨
張係数を合致させることが可能であり、アモルファス膜
の結晶化温度より低融点のガラスを充填し、磁性薄膜が
はく離しない構造となり磁気消去ヘッドの製造歩留りも
高い。Also, by using an amorphous film as a magnetic thin film with a high saturation magnetic flux density formed on the gap facing surface side of the metal oxide magnetic material that becomes the core element, it is possible to match the thermal expansion coefficient with the metal oxide magnetic material. The glass is filled with a glass having a melting point lower than the crystallization temperature of the amorphous film, and the magnetic thin film does not come off, resulting in a high production yield of the magnetic erasing head.
第１図（ａ），（ｂ）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３図，第４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５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。 1,2……コア素片,3……コイル巻線用溝,4……アモルフ
ァス膜,5……充填ガラス,6……非磁性酸化膜,7……非磁
性金属膜,A……磁気記録媒体の相対移動方向1 (a) and 1 (b) 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 shows a magnetic field distribution of the magnetic erasing head of the present invention. FIG. 3 is a plan view of a recording medium facing surface and a main magnetic path forming surface showing a conventional magnetic erase head, and FIG. 5 is a characteristic diagram showing a magnetic field strength distribution of the conventional magnetic erase head. is there. 1,2 …… Core element, 3 …… Coil winding groove, 4 …… Amorphous film, 5 …… Filled glass, 6 …… Non-magnetic oxide film, 7 …… Non-magnetic metal film, A …… Magnetic Relative movement direction of recording medium
フロントページの続き (72)発明者 井手上 人司 茨城県勝田市大字稲田1410番地 株式会社 日立製作所東海工場内 (72)発明者 山村 茂樹 茨城県勝田市大字稲田1410番地 株式会社 日立製作所東海工場内 (56)参考文献 特開 昭58−179920（ＪＰ，Ａ) 特開 昭56−37821（ＪＰ，Ａ) 実公 昭56−32980（ＪＰ，Ｙ２)Front page continuation (72) Inventor Hitoshi Idegami 1410 Inada, Katsuta City, Ibaraki Prefecture, Hitachi Ltd.Tokai Plant (72) Inventor Shigeki Yamamura 1410 Inada, Katsuta City, Ibaraki Hitachi Ltd., Tokai Plant (56) References JP 58-179920 (JP, A) JP 56-37821 (JP, A) JP 56-32980 (JP, Y2)
Claims (4)
コア素片及び後行側コア素片の一対の金属酸化物磁性材
料によりなるコア素片が、所定のトラック幅の磁気ギャ
ップで非磁性材を介して接合され、前記所定のトラック
幅にコア素片が切り欠かれて形成され、一方の前記コア
素片にコイル巻線用溝を有する磁気消去ヘッドにおい
て、 前記後行側コア素片に前記コイル巻線用溝が形成され、 前記先行側コア素片のみに高飽和磁束密度の磁性薄膜の
アモルファス膜と、該高飽和磁束密度の磁性薄膜のアモ
ルファス膜の上の非磁性酸化膜と、該非磁性酸化膜の上
の非磁性金属膜とが形成され、 先行側コア素片及び後行側コア素片の切欠き部が前記ア
モルファス膜の結晶化温度より低融点のガラスで充填さ
れたことを特徴とする磁気消去ヘッド。1. A core piece made of a pair of metal oxide magnetic materials, a leading side core piece and a trailing side core piece, which move relative to a magnetic tape, is not formed in a magnetic gap having a predetermined track width. In a magnetic erasing head, which is joined via a magnetic material, is formed by cutting out a core piece in the predetermined track width, and has one of the core pieces having a groove for coil winding, The groove for coil winding is formed in one piece, the amorphous film of the magnetic thin film having a high saturation magnetic flux density only on the leading side core element, and the non-magnetic oxide film on the amorphous film of the magnetic thin film having the high saturation magnetic flux density And a nonmagnetic metal film on the nonmagnetic oxide film are formed, and the notches of the leading core piece and the trailing core piece are filled with glass having a melting point lower than the crystallization temperature of the amorphous film. Magnetic erasing head characterized by
り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。2. A magnetic erasing head according to claim 1, wherein the amorphous film is composed of three elements of Co, Nb and Zr.
膜としてCrを使用す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。3. The magnetic erasing head according to claim 1, wherein SiO 2 is used as the nonmagnetic oxide film and Cr is used as the nonmagnetic metal film.
を主成分とするガラスを用いることを特徴とする特許請
求の範囲第１項記載の磁気消去ヘッド。4. V 2 O 5 , P 2 O 5 , Sb 2 O 5 as the filling glass
The magnetic erasing head according to claim 1, characterized in that glass containing as a main component is used.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60285527A JPH0770018B2 (en) | 1985-12-20 | 1985-12-20 | Magnetic erase head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60285527A JPH0770018B2 (en) | 1985-12-20 | 1985-12-20 | Magnetic erase head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62145512A JPS62145512A (en) | 1987-06-29 |
| JPH0770018B2 true JPH0770018B2 (en) | 1995-07-31 |
Family
ID=17692684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60285527A Expired - Fee Related JPH0770018B2 (en) | 1985-12-20 | 1985-12-20 | Magnetic erase head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0770018B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04106706A (en) * | 1990-08-28 | 1992-04-08 | Matsushita Electric Ind Co Ltd | Magnetic head |
| JPH06203323A (en) * | 1992-06-16 | 1994-07-22 | Samsung Electro Mech Co Ltd | Magnetic head and its production |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5632980U (en) * | 1979-08-22 | 1981-03-31 | ||
| JPS58179920A (en) * | 1982-04-14 | 1983-10-21 | Pioneer Electronic Corp | Magnetic head and its production |
-
1985
- 1985-12-20 JP JP60285527A patent/JPH0770018B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62145512A (en) | 1987-06-29 |
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