JP3638767B2

JP3638767B2 - Magnetic head and method of manufacturing the magnetic head

Info

Publication number: JP3638767B2
Application number: JP30184497A
Authority: JP
Inventors: 透秋山; 定義小林; 正富阿部
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 1997-11-04
Filing date: 1997-11-04
Publication date: 2005-04-13
Anticipated expiration: 2017-11-04
Also published as: KR100277376B1; JPH11144206A; KR19990044974A

Description

【０００１】
【発明の属する技術分野】
本発明は、磁気へツドのシールドケースの材料にクラッド材又は積層材を使用して、磁気ヘッドの性能向上と組立効率の向上を図った磁気ヘッド及びこの製造方法に関する。
【０００２】
【従来の技術】
従来のＶＴＲまたはオーディオ用の磁気ヘッド１は、図１０に示すようにシールドケース２のテープ摺接面２ａにガード部材３が取り付けられ、このガード部材３の両端側に形成されているコア挿入窓４、５に、ギャップ部６ｂ、７ｂを有する磁気コア６、７が挿入された状態になっている。
また、シールドケース２の長手方向の図示左側の側面には、図示を省略した消去ヘッドが取り付けられている。
このような従来の磁気ヘッド１のシールドケース２は、パーマロイ等の磁性材料から成り、プレス加工等の絞り加工により、一方にテープ摺接面２ａと、他方が開放されて内部が空洞になっている。また、図１１に示すように一方のテープ摺接面２ａは曲面状に形成されている。
また、シールドケース２の長手方向の両端寄りのテープ摺接面２ａには、磁気コア６、７を挿入するコア挿入窓４、５が略矩形状にプレス等で打ち抜き形成されている。
また、このコア挿入窓４、５の間には、図１１に示すような所定の幅と深さのガード溝２ｂが形成されている。このガード溝２ｂには図１１に示すような複数の樹脂孔２ｃが貫通形成されている。
【０００３】
また、ガード溝２ｂには、該ガード溝２ｂの長手方向の寸法より若干長い、耐摩耗性材料で板状のステンレス板等から成るガード部材３が、接着剤等で仮止めされて取り付けられるようになっている。
また、磁気コア６、７はホルダー（図示せず）等に取り付けられて、該ホルダーと一体化されて、シールドケース２の中空内部に挿入され、磁気コア６、７のギャップ部６ｂ、７ｂ側が、コア挿入窓４、５に挿入されている。そして、テープ摺接面６ａ、７ａがコア挿入窓４、５から外側に露出している。前記磁気コア６、７は樹脂材料８によりシールドケース２内に埋設されている。
また、前記樹脂材料８は、ガード溝２ｂに形成されている樹脂孔２ｅにも流れて、ガード溝２ｂに接着剤で仮止めされているガード部材３も同時に固定されるようになっている。
また、図１４（ａ）に示すように、シールドケース２のガード溝２ｂに取り付けられたガード部材３と、コア挿入窓６ａ、７ａから露出する磁気コア６、７のテープ摺接面６ａ、７ａと、シールドケース２のテープ摺接面２ａとが同時に研磨されて、図１４（ｂ）に示すように、前記それぞれの面が同一曲面に研磨されて、ガード部材３の表面にもテープ摺接面９が形成されている。
【０００４】
前述のような従来の磁気ヘッド１の製造方法は、図１３に示すように、治具１０にシールドケース２を挿入する。そして、前記治具１０の２個の凸部１０ａ、１０ａに、シールドケース２のコア挿入窓４、５を位置させる。
このとき、前記凸部１０ａ、１０ａとコア挿入窓４、５とは、作業性向上のために所定のクリアランスを設けられていた。そのために、このクリアランス分だけ治具１０に対してシールドケース２が矢印Ａ方向に動くガタが生じていた。
次に、治具１０の凸部１０ａ、１０ａ間に位置するガード溝２ｂに、ガード部材３を位置させて、接着剤等で仮止めする。このときガード部材３を凸部１０ａ、１０ａ間に挿入しやすくするために、ガード部材３と凸部１０ａ、１０ａ間とにクリアランスを設けていた。このクリアランスにより、ガード部材３は、凸部１０ａ、１０ａ間で矢印Ａ方向に動くガタが生じていた。
【０００５】
前記治具１０に対するシールドケース２のクリアランスと、凸部１０ａ、１０ａ間でのガード部材３のクリアランスとによって、図１２に示すように、シールドケース２の長手方向の一方側の側面２ｄからガード部材３の端部３ａまでの寸法Ｃにバラツキが発生していた。
次に、ガード溝２ｂにガード部材３を仮止め後、シールドケース２から治具１０を抜き取り、シールドケース２の内部に、前記ホルダーで一体化された磁気コア６、７を挿入する。そして、磁気コア６、７の側面６ｃ、７ｃのどちらか一方を、ガード部材３の端面３ａ、３ｂのどちらかに当接、あるいは近接させて、ガード部材を基準にして磁気コア６、７を位置決めする。
このとき、磁気コア６、７のテープ摺接面６ａ、７ａがコア挿入窓４、５から外側に露出した状態になっている。
【０００６】
次に、シールドケース２の内部に樹脂材料８を充填して、磁気コア６、７をシールドケース２の内部に固定する。また、ガード部材３も樹脂孔２ｃに流れた樹脂材料８により、ガード溝２ｂに固定される。
前記位置決めされた磁気コア６、７は、基準となるガード部材３の位置がばらついているため、図１２に示すシールドケース２の一方側の側面２ｄから、磁気コア６の側面６ｃまでの寸法Ｄにバラツキが生じていた。
次に、図１４（ａ）に示すようにガード部材３がシールドケース２のテープ摺接面２ａから突出している部分と、コア挿入窓４、５から露出している磁気コア６、７のテープ摺接面６ａ、７ａとを同時に研磨して、図１４（ｂ）に示すようにシールドケース２のテープ摺接面２ａと段差のない同一曲面のテープ摺接面９を形成して従来の磁気ヘッド１を製造していた。
【０００７】
【発明が解決しようとする課題】
前述したような磁気ヘッド１は、シールドケース２とは別部材のガード部材３を取り付けていたので、部品点数が多くなっていた。そのために、組立効率が悪くなって、コストアップになっていた。
また、図１２に示す寸法Ｄのバラツキにより、磁気ヘッド１の側面に取り付けられる消去用ヘッド（図示せず）の磁気コアと磁気ヘッド１の磁気コア６との位置ズレが発生し、消去ヘッドの位置調整をしなければならなかったので組立に時間が掛かった。
【０００８】
また、図１２に示す寸法Ｄのバラツキにより、磁気ヘッド１を取り付ける装置（図示せず）側に配置される磁気テープと、磁気コア６、７とに位置ズレが生じるために、磁気ヘッド１を装置に取り付けるときの、磁気ヘッド１の高さ調整に時間が掛かり面倒であった。
また、磁気ヘッド１はシールドケース２の大きさは同じもので、ガード部材３の長さと、コア挿入窓６、７間の寸法が異なる、複数の製品バラエティがあった。そのために、磁気ヘッド１を組み立てるときに、ガード部材３とシールドケース２の組み合わせを間違える、組立ミスが発生する問題があった。
本発明は上記課題の磁気コアの位置ズレを防止すると共に、磁気ヘッドの組立効率を向上させることを目的とする。
【０００９】
【課題を解決するための手段】
本発明は、上記課題を解決するための第１の解決手段として、ギャップ部を有する磁気コアと、該磁気コアを挿入するコア挿入窓をテープ摺接面側に設けたシールドケースとを備え、該シールドケースは外層、中間層、内層の３層構造のクラッド材または積層材からなり、該クラッド材または積層材の材料を外層と内層の両層を磁性材料で、前記中間層を耐摩耗材料で構成し、前記コア挿入窓は、磁気テープの幅方向に位置して対向する一対の端面と、少なくとも一方の前記端面が前記コア挿入窓の内方に向かって突出する突部と、前記シールドケース内に向かって広がるように前記突部の先端端面に設けられた傾斜面を有し、前記磁気コアは前記傾斜面が位置する前記突部で位置規制可能とすると共に、少なくとも前記傾斜面が位置する前記突部の前記テープ摺接面上の磁性材料の前記外層が削られて、耐摩耗材料の前記中間層が露出し、露出した前記中間層の一端側が一方の前記端面と直線状となした構成とした。
【００１０】
また、上記課題を解決するための第２の解決手段として、前記磁気コアと前記コア挿入窓とをそれぞれ２個有し、該２個の磁気コアに挟まれる２つの前記コア挿入窓の内側の前記端面、または前記２個の磁気コアの外側に位置する前記２個のコア挿入窓の外側の前記端面には、前記傾斜面が設けられた前記突部が設けられ、前記突部の前記テープ摺接面上の磁性材料の外層が削られて、耐摩耗材料の中間層が露出した構成とした。
【００１１】
また、上記課題を解決するための第３の解決手段として、前記シールドケースの前記テープ摺接面側の一部に凹部を形成し、該凹部の周辺部と前記テープ摺接面上の磁性材料の前記外層が削られて、耐摩耗材料の前記中間層が露出された構成とした。
【００１２】
また、前記課題を解決する第４の手段として、前記凹部を前記コア挿入窓近傍に形成した構成とした。
【００１３】
また、前記課題を解決する第５の手段として、前記凹部の底面を前記中間層の耐摩耗材料の表面と同じ位置にした構成とした。
【００１４】
また、上記課題を解決するための第６の解決手段として、前記３層構造のクラッド材又は積層材の前記外層と前記内層の厚さを同じ厚さに形成した構成とした。
【００１５】
また、上記課題を解決するための第７の解決手段として、前記３層構造のクラッド材又は積層材の前記外層と前記内層の厚さを、前記外層側を前記内層側より薄く形成した構成とした。
【００１７】
また、上記課題を解決する第８の手段として本発明の磁気ヘッドの製造方法は、外層と内層とが磁性材料から成り、中間層が耐摩耗材料とから成る３層構造のクラッド材又は積層材により形成され、テープ摺接面側にコア挿入窓が形成されたシールドケースを有し、前記コア挿入窓は、磁気テープの幅方向に位置して対向する一対の端面と、少なくとも一方の前記端面が前記コア挿入窓の内方に向かって突出する突部を有し、前記突部の先端端面に、前記シールドケース内に向かって広がる傾斜面を形成する工程と、前記コア挿入窓に磁気コアを挿入して前記傾斜面により前記磁気コアの前記コア挿入窓に対する位置規制を行う工程と、前記磁気コアのテープ摺接面と前記シールドケースのテープ摺接面とを研磨する工程で、少なくとも前記傾斜面が位置する前記突部の前記テープ摺接面上の磁性材料の前記外層を研磨して、耐摩耗材料の中間層を露出し、露出した前記中間層の一端側が一方の前記端面と直線状をなした構成とした。
【００１８】
また、上記課題を解決する第９の手段として本発明の磁気ヘッドの製造方法は、前記磁気コアと前記コア挿入窓とをそれぞれ２個有し、該２個の磁気コアに挟まれる２つの前記コア挿入窓の内側の前記端面、または前記２個の磁気コアの外側に位置する前記２個のコア挿入窓の外側の前記端面には、前記傾斜面が設けられた前記突部が設けられ、前記突部の前記テープ摺接面上の磁性材料の外層が削られて、耐摩耗材料の中間層が露出した構成とした。
【００１９】
また、上記課題を解決する第１０の手段として本発明の磁気ヘッドの製造方法は、前記シールドケースには、前記テープ摺接面側に凹部が形成され、前記磁気コアのテープ摺接面と前記シールドケースのテープ摺接面とを研磨する工程で、前記凹部の周辺部と前記テープ摺接面上の磁性材料の外層を研磨して耐摩耗材料の中間層を露出させた構成とした。
【００２０】
また、上記課題を解決する第１１の手段として本発明の磁気ヘッドの製造方法は、前記凹部を前記コア挿入窓近傍に形成した構成とした。
また、上記課題を解決する第１２の手段として本発明の磁気ヘッドの製造方法は、前記凹部の底面を前記中間層の耐摩耗材料の表面と同じ位置にした構成とした。
【００２１】
また、上記課題を解決する第１３の手段として本発明の磁気ヘッドの製造方法は、前記３層構造のクラッド材又は積層材の前記外層と前記内層の厚さを同じ厚さに形成した構成とした。
また、上記課題を解決する第１４の手段として本発明の磁気ヘッドの製造方法は、前記３層構造のクラッド材又は積層材の前記外層と前記内層の厚さを、前記外層側を前記内層側より薄く形成した構成とした。
【００２２】
【発明の実施の形態】
以下、本発明の一実施の形態の磁気へツド１１を、ＶＴＲの音声コントロールヘッド又はオーディオ用ヘッドを例に図１〜図９を基に説明する。また、従来の技術で説明したものと同一のものについては同一の番号を付して詳細な説明は省略する。
まず、本発明の磁気ヘッド１１には、図１に示すように消去ヘッド１２が取り付けられている。そして、磁気ヘッド１１のシールドケース１３は、図２に示すような外層１３ａ、中間層１３ｂ、内層１３ｃの３層構造のクラッド材又は積層材で形成され、その材質は外層１３ａと内層１３ｃの両層に磁性材料であるパーマロイ材と、中間層１３ｂに耐摩耗材料であるステンレス材とで構成されている。
そして、シールドケース１３はプレス加工等の絞り加工により、内部が空洞で他方側が開放されて、一方側に磁気テープ（図示せず）が摺接するテープ摺接面１４が曲面状に形成されている。
このテープ摺接面１４は後述する製造方法により、パーマロイ材の外層１３ａが研磨により削られて、ステンレス材の中間層１３ｂが露出した状態になっている。しかし、本発明の構成の説明では前記外層１３ａを研磨しない状態の説明が多いので、研磨後の説明をするときのみ、研磨がされていることの注釈を加えて説明する。
【００２３】
前記テープ摺接面１４の前記磁気テープの幅方向には、形状が略矩形の一対のコア挿入窓１５、１６がプレス等で打ち抜き形成されている。
このコア挿入窓１５、１６には、四方がプレス等で打ち抜かれた切断面から成る端面が形成されている。そして、例えば一方側のコア挿入窓１５に、磁気テープの幅方向に位置する端面１５ａ、１５ｂを有し、前記コア挿入窓１５をプレス等で打ち抜き形成するときに、同時に端面１５ａ、１５ｂの一部にシールドケース１３内に向かって広がる、角度αの傾斜面１７、１７（図３参照）が設けられるようになっている。この傾斜面１７、１７の角度αは１０゜〜４５゜に形成されている。
【００２４】
また、図４に示すように、コア挿入窓１５の端面１５ａ、１５ｂ側の一部を内方に突出させた端面を有する突部１７ａが設けられている。この突部１７ａは磁性材料から成る外層１３ａで形成され、前記突部１７ａ、１７ａから前記傾斜面１７、１７がシールドケース１３内に向かって広がって形成されている。
また、他方側のコア挿入窓１６の端面１６ａ、１６ｂは、打ち抜き加工だけで略平行に形成されている。
前記傾斜面１７、１７は、一方側のコア挿入窓１５に形成したものに限定されず、他方側のコア挿入窓１６に傾斜面１７、１７を形成したものでもよい。
【００２５】
また、従来の技術で説明したホルダー（図示せず）等に取り付けられて一体化されたギャップ部６ｂ、７ｂを有する磁気コア６、７が、シールドケース１３の内部に収納され、前記コア挿入窓１５、１６には磁気コア６、７のギャップ部６ｂ、７ｂ側が挿入され、コア挿入窓１５、１６からテープ摺接面６ａ、７ａが露出した状態で位置決めされるようになっている。
前記磁気コア６、７は図３に示すように、幅寸法Ｅ、Ｅ’で形成されている。また、コア挿入窓１５の端面１５ａ、１５ｂ側の突部１７ａ、１７ａ間の間隔は、図３、４に示すように寸法ｆで形成されている。
【００２６】
このコア挿入窓１５の幅寸法ｆは、ｆ≧Ｅの関係になるように形成されている。そして、磁気コア６は前記突部１７ａ、１７ａにガイドされて、コア挿入窓１５にガタのない状態、あるいはガタがあったとしても、極めて微小なガタで挿入されるようになっている。
また、他方側のコア挿入窓１６の幅寸法Ｇは、Ｇ＞Ｅ’の関係になるように形成されて、磁気コア７とコア挿入窓１６とには所定の隙間が形成されている。
前記コア挿入窓１５への磁気コア６の挿入は、図３に示す傾斜面１７、１７の図示下方から、磁気コア６のテープ摺接面６ａ側をコア挿入窓１５に挿入する。すると、磁気コア６のテープ摺接面６ａ側のコーナ部が、前記傾斜面１７、１７に案内されるので、挿入の作業性が落ちることはない。
また、磁気コア６、７はホルダーで一体化されているので、一方側の磁気コア６がコア挿入窓１５に挿入されると、他方の磁気コア７も同時にコア挿入部１６に挿入されて位置するようになっている。そして、図３に示すようにテープ摺接面１４の外層１３ａの磁性材料と、磁気コア６、７のテープ摺接面６ａ、７ａとが略同一面になるようになっている。
【００２７】
また、図１に示すコア挿入窓１５の図示右側の前記テープ摺接面１４側の一部で、コア挿入窓１５近傍に凹部１８が形成されている。この凹部１８の底面は図２に示すように、前記中間層１３ｂの耐摩耗材料の表面と同じ位置に、プレス等で突き出し形成されている。
前記コア挿入窓１５、１６に磁気コア６、７が挿入されて位置決めされると、シールドケース１３の内部に樹脂材料８が充填され、この樹脂材料８により磁気コア６、７がシールドケース１３の内部に固定される。
そして、図３に示すようにシールドケース１３のテープ摺接面１４は、後述する製造方法により、磁気コア６、７のテープ摺接面６ａ、７ａと、シールドケースのテープ摺接面１４とを同時に研磨する。この研磨により、前記コア挿入窓５の端面１５ａ１５ｂ、及び突部１７ａ、１７ａの周辺部を含むテープ摺接面１４上の磁性材料の外層３ａが削られて、テープ摺接面１４に耐摩耗材料の中間層１３ｂが露出されるようになっている。そして、前記磁気コア６、７のテープ摺接面６ａ、７ａと、シールドケース１３のテープ摺接面１４とが鏡面状態になって本発明の磁気ヘッド１１が構成されている。
【００２８】
前述したような構成の本発明の磁気ヘッド１１の製造方法について、図１〜図６を用いて説明すると、まず、前記シールドケース１３は、プレス等で絞り加工されて内部が中空に形成されている。
そして、このシールドケース１３のテープ摺接面１４側に、コア挿入窓１５、１６を打ち抜き形成すると共に、一方側のコア挿入窓１５の磁気テープ（図示せず）の幅方向に位置する端面１５ａ、１５ｂの一部に、前記シールドケース１３内に向かって広がる傾斜面１７、１７を形成する。
この傾斜面１７、１７は、図３、４に示すように、コア挿入窓１５の端面１５ａ、１５ｂ側の一部を内方に突出させた端面を有する突部１７ａ、１７ａを設け、前記内方に突出する突部１７ａ、１７ａの端面に角度αでプレス加工等で形成する。そして、この突部１７ａ、１７ａ間は寸法ｆに形成されている。
また、前記テープ摺接面１４にコア挿入窓を打ち抜き形成するときに、同時もしくは同じ工程にて前記凹部１８を形成する。
【００２９】
次に、該傾斜面１７、１７により磁気コア６、７の位置規制を行う工程で、磁気コア６をコア挿入窓１５に挿入すると、磁気コア６が傾斜面１７、１７に案内されて、磁気コア６のテープ摺接面６ａが前記突部１７ａ、１７ａ間に挟まれて位置規制されて、テープ摺接面６ａがコア挿入窓１５から露出する。
また、磁気コア７は前記ホルダーで磁気コア６と所定の間隔が保たれて一体化されているので、前述のように一方の磁気コア６が位置規制されることにより、他方の磁気コア７もコア挿入窓１６内に位置規制される。
そのために、シールドケース１３に取り付けられた磁気コア６、７の位置に、ほとんどバラツキがなく、常にシールドケース１３の図１に示す上部側面１３ｄ、及び下部側面１３ｅから略同じ位置に磁気コア６、７を取り付けることができる。
【００３０】
次に磁気コア６、７を固定する工程で、液状の樹脂材料８をシールドケース１３内に流し込み、この液状の樹脂材料を固化させて磁気コア６、７を固定する。次に磁気コア６、７のテープ摺接面６ａ、７ａとシールドケース１３のテープ摺接面１４とを研磨する工程で、図３に示すように、少なくともコア挿入窓１５の端面１５ａ、１５ｂの周辺部と、前記凹部１８の周辺部とを研磨して、テープ摺接面１４上のパーマロイ材の外層を研磨して、耐摩耗材料の中間層１３ｂを露出させる。
また、前記研磨工程により前記突部１７ａ、１７ａを含むシールドケース１３のテープ摺接面１４を研磨することにより、前記傾斜面１７、１７にステンレス材の中間層１３ｂの端部１７ｂ、１７ｂが形成される。このステンレス材から成る端部１７ｂ、１７ｂはコア挿入窓１５の端面１５ａ、１５ｂと略同一面になるようになっている。
そして端部１７ｂ、１７ｂ間は、コア挿入窓１５の幅寸法と同じ寸法Ｆに形成されて、磁気コア６とコア挿入窓１５とに所定の隙間ｈが形成される。
【００３１】
このような製造方法で製造された本発明の磁気ヘッド１１は、研磨加工によりテープ摺接面１４は鏡面状態になっているので、研磨後のテープ摺接面１４に確実にステンレス材が露出されているかどうかの判断が難しかった。
そのために本発明の磁気ヘッド１１は、もし中間層１３ｂのステンレス材を研磨しすぎて内層１３ｃのパーマロイ材が露出した場合でも容易に肉眼等でチェックできるようになっている。
即ち、中間層１３ｂのステンレス材を研磨しすぎて内層１３ｃのパーマロイ材が露出すると、前記傾斜面１７、１７のステンレス材から成る端部１７ｂ、１７ｂがなくなり、図６に示すように傾斜面１７、１７の端部１７ｃ、１７ｃが内層１３ｃのパーマロイ材で形成され、該内層１３ｃから成る端部１７ｃ、１７ｃが前記コア挿入窓１５の端面１５ａ、１５ｂから外側に突出形成されて階段状に形成される。そのために、コア挿入窓１５の端面１５ａ、１５ｂの一部に形成されている傾斜面１７、１７の端部を観察すれば、テープ摺接面１４が適正に研磨されているかどうかが容易に判断することができる。
【００３２】
また、テープ摺接面１４を研磨仕上げする工程で、テープ摺接面１４の表面から前記凹部１８の痕跡がなくなるまで研磨すると、中間層１３ｂのステンレス材が露出したと判断することができる。
即ち、テープ摺接面１４を研磨仕上げ後に、テープ摺接面１４に凹部１８の痕跡がなくて、且つ図６に示すようなコア挿入窓１５の端面１５ａ、１５ｂから外側に突出する階段状の傾斜面１７の端部１７ｃ、１７ｃが形成されていなければ、テープ摺接面１４が適正に研磨されて、中間層１３ｂのステンレス材が確実に露出されていると容易に判断することができる。
【００３３】
本発明の磁気ヘッド１１の実施の形態では、傾斜面１７をコア挿入窓１５の両側の端面１５ａ、１５ｂの一部に形成したもので説明したが、図７に示すようにどちらか一方の端面にだけに形成して、１個の傾斜面１７の突部１７ａに磁気コア６の側面６ｃを当接して、磁気コア６、７の位置規制をしたものでもよい。
また、前記傾斜面１７の形成は、一方側のコア挿入窓１５だけに限定されず、他方側のコア挿入窓１６に形成してもよい。
【００３４】
また、図８に示すように２個の磁気コア６、７に挟まれる２つのコア挿入窓１５、１６の端面１５ａ、１６ａに前記傾斜面１７、１７を形成して、該傾斜面１７、１７の突部１７ａ、１７ａで磁気コア６、７を位置規制してもよい。
【００３５】
また、図９に示すように、前記２個のコア挿入窓１５、１６の外側の端面１５ｂ、１６ｂに前記傾斜面１７、１７を形成し、該傾斜面１７、１７の突部１７ａ、１７ａで磁気コア６、７を位置規制してもよい。
【００３６】
【発明の効果】
本発明の磁気ヘッドは、ギャップ部を有する磁気コアと、該磁気コアを挿入するコア挿入窓をテープ摺接面側に設けたシールドケースとを備え、該シールドケースは外層、中間層、内層の３層構造のクラッド材又は積層材から成り、該クラッド材又は積層材の材料を外層と内層の両層を磁性材料で、前記中間層を耐摩耗材料とで構成し、前記コア挿入窓の磁気テープの幅方向に位置する少なくとも一方の端面を、前記シールドケース内に向かって広がるような傾斜面となし、前記一方の端面の周辺部を含む前記テープ摺接面上の磁性材料の外層が削られて、耐摩耗材料の中間層が露出された構成になっているので、従来の磁気ヘッドに用いていたガード部材等が不要になり部品点数を少なくすることができ、且つ組み立て工数も削減できる。そのために、低コストの磁気ヘッドを提供することができる。
また、前記傾斜面で磁気コアの位置規制をすることができるので、シールドケース内に樹脂材料で固定された磁気コアの位置バラツキがほとんどなくなった。そのために、消去ヘッドとの位置調整が若干の微調整程度だけでよく、更に組み立て時間を短縮することができる。
また、従来のような種類の異なるガード部材が不要になるので、組立ミス等の問題のない磁気ヘッドを提供することができる。
【００３７】
また、前記磁気コアと前記コア挿入窓とをそれぞれ２個有し、該２個の磁気コアに挟まれる２つの前記コア挿入窓の内側の端面、または前記２個の磁気コアの外側に位置する前記２個のコア挿入窓の外側の端面を前記傾斜面と成したので、該傾斜面で磁気コアの位置精度を向上させることができ、本発明の磁気ヘッドを得意先で装置側に取り付けるときに、磁気ヘッドの取り付け高さの調整も容易になり、装置側の組立時間を短縮することができる。
【００３８】
また、ギャップ部を有する磁気コアと、該磁気コアを挿入するコア挿入窓をテープ摺接面側に設けたシールドケースとを備え、該シールドケースは外層、中間層、内層の３層構造のクラッド材又は積層材から成り、該クラッド材又は積層材の材料を外層と内層の両層を磁性材料で、前記中間層を耐摩耗材料とで構成すると共に、前記シールドケースの前記テープ摺接面側の一部に凹部を形成し、該凹部の周辺部と前記テープ摺接面上の磁性材料の外層が削られて、耐摩耗材料の中間層が露出された構成になっているので、前記テープ摺接面を研磨すると、前記凹部も研磨され、該研磨により前記凹部の痕跡がなくなると、耐摩耗材料の中間層が露出されたと判断することができる。そのために研磨不足等のない適正な研磨を行うことができる。
【００３９】
また、前記凹部を前記コア挿入窓近傍に形成したので、前記コア挿入窓を打ち抜き加工する金型のポンチと、前記凹部を加工する金型のポンチとを近づけて配置することができ、プレス金型を小型にすることができる。
【００４０】
また、前記凹部の底面を前記中間層の耐摩耗材料の表面と同じ位置にしたので、前記テープ摺接面を研磨するときに、前記凹部の底面の痕跡がなくなるまで研磨すれば、テープ摺接面に耐摩耗材料の中間層が露出されたと、容易に判断することができる。
【００４１】
また、前記コア挿入窓の磁気テープの幅方向に位置する少なくとも一方の端面を、前記シールドケース内に向かって広がるような傾斜面となし、前記一方の端面の周辺部の磁性材料の外層が削られて、前記耐摩耗材料の中間層が露出された構成になっているので、前記傾斜面で磁気コアの位置規制をすることができ、且つ前記凹部の底面の痕跡がなくなるまでテープ摺接面を研磨すればよい。そのために、磁気コアの位置のバラツキがなくて、テープ摺接面に耐摩耗材料の中間層を確実に露出させた磁気ヘッドを提供することができる。
【００４２】
また、前記３層構造のクラッド材又は積層材の外層と内層の厚さを、同じ厚さに形成したので、本発明の磁気ヘッドに周囲から熱等が加わっても、シールドケースが片方に反り返るような変形がない。そのために、耐熱特性に優れた磁気ヘッドを提供することができる。
【００４３】
また、前記３層構造のクラッド材又は積層材の外層と内層の厚さを、外層側を内層側より薄く形成したので、外層の磁性材料を研磨するときの研磨量が少なくてすみ、研磨時間を短縮することができる。また、内層の体積を大きく取ることができるので、シールド効果を向上させることができる。
【００４４】
また、本発明の磁気ヘッドの製造方法は、外層と内層とが磁性材料から成り、中間層が耐摩耗材料とから成る３層構造のクラッド材又は積層材により形成され、テープ摺接面側にコア挿入窓が形成されたシールドケースを有し、前記コア挿入窓の磁気テープの幅方向に位置する少なくとも一方の端面に、前記シールドケース内に向かって広がる傾斜面を形成する工程と、前記コア挿入窓に磁気コアを挿入して前記傾斜面により前記磁気コアの前記コア挿入窓に対する位置規制を行う工程と、前記磁気コアのテープ摺接面と前記シールドケースのテープ摺接面とを研磨する工程で、少なくとも前記一方の端面の周辺部と、前記テープ摺接面上の磁性材料の外層を研磨して耐摩耗材料の中間層を露出させたので、従来の磁気ヘッドに用いていたガード部材が不要になり、部品点数が少なくて、且つ組み立て工数も削減することができる。
【００４５】
また、本発明の磁気ヘッドの製造方法は、前記コア挿入窓の前記端面側の一部を内方に突出させた端面を有する突部を設けた前記シールドケースを有し、前記内方に突出する前記突部の端面に前記傾斜面を形成する工程と、前記突部の傾斜面により前記磁気コアの前記コア挿入窓に対する位置規制を行う工程と、前記突部を含む前記磁気コアのテープ摺接面と前記シールドケースのテープ摺接面とを研磨する工程とを備えているので、前記突部で磁気コアの位置規制を精度よく行うことができる。また、前記研磨工程で突部を研磨すると、該突部が削られて前記傾斜面の端部が前記中間層の耐摩耗材料で形成され、該耐摩耗材料から成る傾斜面の端部と、前記コア挿入窓の端面とが略同一面になり、コア挿入窓の形状の変化で、適正な研磨が行われているかどうかの判断を容易に行うことができる。
【００４６】
また、本発明の磁気ヘッドの製造方法は、外層と内層とが磁性材料から成り、中間層が耐摩耗材料とから成る３層構造のクラッド材又は積層材により形成され、テープ摺接面側にコア挿入窓と凹部とが形成されたシールドケースを有し、前記磁気コアのテープ摺接面と前記シールドケースのテープ摺接面とを研磨する工程で、前記凹部の周辺部と前記テープ摺接面上の磁性材料の外層を研磨して耐摩耗材料の中間層を露出させたので、前記研磨工程で前記凹部の底面の痕跡がなくなると、耐摩耗材料の中間層が露出されたと判断することができる。そのために、テープ摺接面の研磨量が適正かどうかを肉眼等で容易に判断することができる。
【００４７】
また、本発明の磁気ヘッドの製造方法は、前記コア挿入窓の磁気テープの幅方向に位置する少なくとも一方の端面に、前記シールドケース内に向かって広がる傾斜面を形成する工程と、前記コア挿入窓に磁気コアを挿入して前記傾斜面により前記磁気コアの前記コア挿入窓に対する位置規制を行う工程と、前記磁気コアのテープ摺接面と前記シールドケースの前記凹部を含むテープ摺接面とを研磨する工程で、前記一方の端面の周辺部と前記テープ摺接面上の磁性材料の外層を研磨して耐摩耗材料の中間層を露出させたので、前記傾斜面により磁気コアの位置規制をすることができ、磁気コアの位置バラツキがない高精度の磁気ヘッドを提供することができる。
【００４８】
また、本発明の磁気ヘッドの製造方法は、前記コア挿入窓の前記端面側の一部を内方に突出させた端面を有する突部を設けた前記シールドケースを有し、前記内方に突出する前記突部の端面に前記傾斜面を形成する工程と、前記突部の傾斜面により前記磁気コアの前記コア挿入窓に対する位置規制を行う工程と、前記突部を含む前記磁気コアのテープ摺接面と前記シールドケースの前記凹部を含むテープ摺接面とを研磨する工程とを備えたので、前記凹部と前記突部とを組み合わせることにより、シールドケースのテープ摺接面が適正に研磨されて、耐摩耗材料の中間層が露出したことを肉眼等で容易に判断することができる。
【図面の簡単な説明】
【図１】本発明の磁気ヘッドを説明する概略斜視図。
【図２】本発明の磁気ヘッドのシールドケースの要部断面図。
【図３】本発明の磁気ヘッドのシールドケースと磁気コアの関係を説明する要部断面図。
【図４】本発明の磁気ヘッドの研磨前のコア挿入窓の形状を説明する概略平面図。
【図５】本発明の磁気ヘッドのコア挿入窓の研磨による変化を説明する概略平面図。
【図６】本発明の磁気ヘッドのコア挿入窓の研磨による変化を説明する概略平面図。
【図７】本発明の磁気ヘッドのその他の実施の形態を説明するよう部断面図。
【図８】本発明の磁気ヘッドのその他の実施の形態を説明するよう部断面図。
【図９】本発明の磁気ヘッドのその他の実施の形態を説明するよう部断面図。
【図１０】従来の磁気ヘッドを説明する概略斜視図。
【図１１】従来の磁気ヘッドのシールドケースを説明する概略斜視図。
【図１２】従来の磁気ヘッドを説明する平面図。
【図１３】従来の磁気ヘッドの製造方法を説明する要部断面図。
【図１４】従来の磁気ヘッドの製造方法を説明する要部断面図。
【符号の説明】
６磁気コア
７磁気コア
８樹脂材料
１１磁気ヘッド
１２消去ヘッド
１３シールドケース
１３ａ外層
１３ｂ中間層
１３ｃ内層
１３ｄ上部側面
１３ｅ下部側面
１４テープ摺接面
１５コア挿入窓
１５ａ端面
１５ｂ端面
１６コア挿入窓
１６ａ端面
１６ｂ端面
１７傾斜面
１７ａ突部
１７ｂ端部
１７ｃ端部
１８凹部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic head that uses a clad material or a laminated material as a material for a shield case of a magnetic head, and to improve the performance and assembly efficiency of the magnetic head, and a method of manufacturing the same.
[0002]
[Prior art]
As shown in FIG. 10, the conventional VTR or audio magnetic head 1 has a guard member 3 attached to the tape sliding contact surface 2 a of the shield case 2, and core insertion windows formed on both ends of the guard member 3. The magnetic cores 6 and 7 having the gap portions 6b and 7b are inserted into 4 and 5 respectively.
An erasing head (not shown) is attached to the left side surface of the shield case 2 in the longitudinal direction.
The shield case 2 of such a conventional magnetic head 1 is made of a magnetic material such as permalloy, and the tape sliding contact surface 2a is opened on one side and the other is opened by a drawing process such as a press process so that the inside is hollow. Yes. Moreover, as shown in FIG. 11, one tape sliding contact surface 2a is formed in a curved surface shape.
Further, core insertion windows 4 and 5 into which the magnetic cores 6 and 7 are inserted are punched and formed in a substantially rectangular shape on the tape sliding contact surface 2a near both ends in the longitudinal direction of the shield case 2 by a press or the like.
A guard groove 2b having a predetermined width and depth as shown in FIG. 11 is formed between the core insertion windows 4 and 5. A plurality of resin holes 2c as shown in FIG. 11 are formed through the guard groove 2b.
[0003]
Further, a guard member 3 made of a wear-resistant material plate-like stainless steel plate or the like that is slightly longer than the longitudinal dimension of the guard groove 2b is temporarily attached to the guard groove 2b with an adhesive or the like. It has become.
The magnetic cores 6 and 7 are attached to a holder (not shown) or the like, integrated with the holder, inserted into the hollow inside of the shield case 2, and the gaps 6b and 7b side of the magnetic cores 6 and 7 are The core insertion windows 4 and 5 are inserted. The tape sliding contact surfaces 6a, 7a are exposed to the outside from the core insertion windows 4, 5. The magnetic cores 6 and 7 are embedded in the shield case 2 with a resin material 8.
The resin material 8 also flows into the resin hole 2e formed in the guard groove 2b, and the guard member 3 temporarily fixed with an adhesive to the guard groove 2b is also fixed at the same time.
Further, as shown in FIG. 14 (a), the tape contact surface 6a, 7a of the guard member 3 attached to the guard groove 2b of the shield case 2 and the magnetic cores 6, 7 exposed from the core insertion windows 6a, 7a. And the tape sliding contact surface 2a of the shield case 2 are polished at the same time, and the respective surfaces are polished to the same curved surface as shown in FIG. A surface 9 is formed.
[0004]
In the conventional method of manufacturing the magnetic head 1 as described above, the shield case 2 is inserted into the jig 10 as shown in FIG. Then, the core insertion windows 4 and 5 of the shield case 2 are positioned on the two convex portions 10 a and 10 a of the jig 10.
At this time, the protrusions 10a and 10a and the core insertion windows 4 and 5 are provided with a predetermined clearance for improving workability. Therefore, there is a backlash that the shield case 2 moves in the direction of arrow A with respect to the jig 10 by this clearance.
Next, the guard member 3 is positioned in the guard groove 2b located between the convex portions 10a and 10a of the jig 10 and temporarily fixed with an adhesive or the like. At this time, in order to facilitate insertion of the guard member 3 between the convex portions 10a and 10a, a clearance is provided between the guard member 3 and the convex portions 10a and 10a. Due to this clearance, the guard member 3 has a backlash that moves in the direction of arrow A between the convex portions 10a and 10a.
[0005]
As shown in FIG. 12, due to the clearance of the shield case 2 with respect to the jig 10 and the clearance of the guard member 3 between the convex portions 10a and 10a, the guard member is removed from the side surface 2d on one side in the longitudinal direction of the shield case 2. 3 had a variation in the dimension C up to the end 3a.
Next, after temporarily securing the guard member 3 in the guard groove 2 b, the jig 10 is removed from the shield case 2, and the magnetic cores 6 and 7 integrated by the holder are inserted into the shield case 2. Then, either one of the side surfaces 6c and 7c of the magnetic cores 6 and 7 is brought into contact with or brought close to one of the end surfaces 3a and 3b of the guard member 3 so that the magnetic cores 6 and 7 are referenced with respect to the guard member. Position.
At this time, the tape sliding contact surfaces 6a and 7a of the magnetic cores 6 and 7 are exposed from the core insertion windows 4 and 5 to the outside.
[0006]
Next, the inside of the shield case 2 is filled with the resin material 8, and the magnetic cores 6 and 7 are fixed inside the shield case 2. The guard member 3 is also fixed to the guard groove 2b by the resin material 8 that has flowed into the resin hole 2c.
Since the positioned magnetic cores 6 and 7 have different positions of the reference guard member 3, the dimension D from the side surface 2d on one side of the shield case 2 shown in FIG. 12 to the side surface 6c of the magnetic core 6 is shown. There was variation.
Next, as shown in FIG. 14 (a), the guard member 3 protrudes from the tape sliding contact surface 2 a of the shield case 2, and the tapes of the magnetic cores 6 and 7 exposed from the core insertion windows 4 and 5. The slidable contact surfaces 6a and 7a are simultaneously polished to form a tape slidable contact surface 9 having the same curved surface as the tape slidable contact surface 2a of the shield case 2 as shown in FIG. The head 1 was manufactured.
[0007]
[Problems to be solved by the invention]
Since the magnetic head 1 as described above is provided with the guard member 3 which is a separate member from the shield case 2, the number of parts is large. For this reason, the assembly efficiency has deteriorated and the cost has been increased.
Further, due to the variation of the dimension D shown in FIG. 12, a positional deviation between the magnetic core of the erasing head (not shown) attached to the side surface of the magnetic head 1 and the magnetic core 6 of the magnetic head 1 occurs. Since it was necessary to adjust the position, it took time to assemble.
[0008]
In addition, due to the variation of the dimension D shown in FIG. 12, the magnetic head 1 is misaligned between the magnetic tape disposed on the apparatus (not shown) side to which the magnetic head 1 is attached and the magnetic cores 6 and 7. It took time and trouble to adjust the height of the magnetic head 1 when it was attached to the apparatus.
Further, the magnetic head 1 has the same size of the shield case 2 and has a plurality of product variety in which the length of the guard member 3 and the dimension between the core insertion windows 6 and 7 are different. For this reason, when assembling the magnetic head 1, there is a problem in that an assembling error occurs due to an incorrect combination of the guard member 3 and the shield case 2.
An object of the present invention is to prevent the above-described magnetic core misalignment and improve the assembly efficiency of the magnetic head.
[0009]
[Means for Solving the Problems]
  The present invention, as a first means for solving the above problems, comprises a magnetic core having a gap portion, and a shield case provided with a core insertion window for inserting the magnetic core on the tape sliding contact surface side, The shield case is composed of a clad material or a laminated material having a three-layer structure of an outer layer, an intermediate layer, and an inner layer, and the material of the clad material or laminated material is a magnetic material for both the outer layer and the inner layer, and the intermediate layer is a wear-resistant material. The core insertion window composed ofIsPositioned in the width direction of the magnetic tapeA pair of opposing end faces,At least one of the end facesA protrusion protruding toward the inside of the core insertion window,To spread toward the shield caseProvided on the tip end face of the protrusionHas an inclined surface,The magnetic core can be regulated by the protrusion where the inclined surface is located, and at least the protrusion of the protrusion where the inclined surface is located.Magnetic material on the tape sliding surfaceSaidThe outer layer is shaved and the wear-resistant materialSaidThe middle layer is exposedAnd one end side of the exposed intermediate layer is linear with one of the end facesThe configuration.
[0010]
  In addition, as a second solution for solving the above-described problem, each of the two magnetic cores and the core insertion window has two each, and the inside of the two core insertion windows sandwiched between the two magnetic cores.SaidAn end face or an outside of the two core insertion windows located outside the two magnetic cores.SaidEnd faceInThe inclined surfaceAnd the outer layer of the magnetic material on the tape-sliding contact surface of the protrusion is scraped to expose the intermediate layer of the wear-resistant material.The configuration.
[0011]
In addition, as a third solving means for solving the above problem,SaidA concave portion is formed in a part of the shield case on the tape sliding contact side, and the magnetic material on the peripheral portion of the concave portion and the tape sliding contact surface is formed.SaidThe outer layer was scraped to expose the intermediate layer of wear-resistant material.
[0012]
Further, as a fourth means for solving the above problem, the concave portion is formed in the vicinity of the core insertion window.
[0013]
Further, as a fifth means for solving the above problem, the bottom surface of the concave portion is configured to be in the same position as the surface of the wear resistant material of the intermediate layer.
[0014]
  In addition, as a sixth solving means for solving the above problem,The outer layer and the inner layer of the three-layer clad material or laminated material are formed to have the same thickness.The configuration was as follows.
[0015]
  Further, as a seventh solving means for solving the above problems, the thickness of the outer layer and the inner layer of the clad material or laminated material of the three-layer structure,The outer layer side is thinner than the inner layer sideIt was set as the formed structure.
[0017]
  In addition, the first to solve the above problems8As a means for manufacturing the magnetic head according to the present invention, the outer layer and the inner layer are made of a magnetic material, and the intermediate layer is made of a clad material or a laminated material made of an abrasion resistant material. The core insertion window has a shield case formed with a core insertion window.Has a pair of end faces located opposite to each other in the width direction of the magnetic tape, and at least one of the end faces protrudes inward of the core insertion window, and the tip of the protrusionA step of forming an inclined surface extending toward the inside of the shield case on the end surface; a step of inserting a magnetic core into the core insertion window and regulating the position of the magnetic core with respect to the core insertion window by the inclined surface; In the step of polishing the tape sliding contact surface of the magnetic core and the tape sliding contact surface of the shield case, at leastOf the protrusion where the inclined surface is located.Magnetic material on the tape sliding surfaceSaidPolishing the outer layer,Exposed middle layer of wear resistant materialAnd one end side of the exposed intermediate layer is linear with one of the end facesThe configuration.
[0018]
  In addition, the first to solve the above problems9As a means for manufacturing the magnetic head of the present invention,The magnetic core and the core insertion window each have two, and the end face inside the two core insertion windows sandwiched between the two magnetic cores or the outside of the two magnetic cores The protrusions provided with the inclined surfaces are provided on the end faces outside the two core insertion windows, and the outer layer of the magnetic material on the tape-sliding contact surface of the protrusions is shaved to wear resistance. Exposed intermediate layer of materialThe configuration.
[0019]
In addition, the first to solve the above problems10As a means for manufacturing the magnetic head of the present invention,In the shield case, a concave portion is formed on the tape sliding contact surface side, and in the step of polishing the tape sliding contact surface of the magnetic core and the tape sliding contact surface of the shield case, the peripheral portion of the concave portion and the tape The outer layer of magnetic material on the sliding surface was polished to expose the intermediate layer of wear-resistant materialThe configuration.
[0020]
  In addition, the first to solve the above problems11As a means for manufacturing the magnetic head of the present invention,The recess was formed in the vicinity of the core insertion windowThe configuration.
  Further, as a twelfth means for solving the above problems, the magnetic head manufacturing method of the present invention is configured such that the bottom surface of the concave portion is located at the same position as the surface of the wear resistant material of the intermediate layer.
[0021]
  Further, as a thirteenth means for solving the above-described problem, a method for manufacturing a magnetic head according to the present invention includesThe outer layer and the inner layer of the clad material or laminated material having the three-layer structure are formed to have the same thickness.The configuration.
  Further, as a fourteenth means for solving the above-described problem, the method of manufacturing a magnetic head according to the present invention includes the thickness of the outer layer and the inner layer of the clad material or laminated material having the three-layer structure, and the outer layer side is the inner layer side. The structure was formed thinner.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a magnetic head 11 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 9, taking a VTR voice control head or an audio head as an example. In addition, the same components as those described in the related art are denoted by the same reference numerals, and detailed description thereof is omitted.
First, an erasing head 12 is attached to the magnetic head 11 of the present invention as shown in FIG. The shield case 13 of the magnetic head 11 is formed of a clad material or a laminated material having a three-layer structure of an outer layer 13a, an intermediate layer 13b, and an inner layer 13c as shown in FIG. The layer is made of a permalloy material, which is a magnetic material, and the intermediate layer 13b is made of a stainless material, which is a wear-resistant material.
The shield case 13 is formed by a drawing process such as a press process so that the inside of the shield case 13 is hollow and the other side is opened, and a tape slidable contact surface 14 on which a magnetic tape (not shown) slidably contacts is formed on one side. .
The tape sliding contact surface 14 is in a state in which the outer layer 13a made of permalloy material is shaved by polishing and the intermediate layer 13b made of stainless steel is exposed by a manufacturing method described later. However, in the explanation of the configuration of the present invention, there are many explanations of the state in which the outer layer 13a is not polished. Therefore, only the explanation after the polishing will be given with an annotation that the polishing is performed.
[0023]
In the width direction of the magnetic tape on the tape sliding contact surface 14, a pair of core insertion windows 15 and 16 having a substantially rectangular shape are punched and formed by a press or the like.
Each of the core insertion windows 15 and 16 has an end surface formed of a cut surface that is stamped on four sides by a press or the like. For example, the core insertion window 15 on one side has end faces 15a and 15b positioned in the width direction of the magnetic tape. When the core insertion window 15 is formed by stamping with a press or the like, one of the end faces 15a and 15b is simultaneously formed. The inclined surfaces 17 and 17 (see FIG. 3) with an angle α are provided in the part, and spread toward the inside of the shield case 13. The angle α of the inclined surfaces 17 and 17 is 10 ° to 45 °.
[0024]
Further, as shown in FIG. 4, a protrusion 17 a having an end surface in which a part of the end surface 15 a, 15 b side of the core insertion window 15 is protruded inward is provided. The protrusions 17 a are formed of an outer layer 13 a made of a magnetic material, and the inclined surfaces 17, 17 are formed so as to spread from the protrusions 17 a, 17 a toward the shield case 13.
Further, the end surfaces 16a and 16b of the core insertion window 16 on the other side are formed substantially parallel only by punching.
The inclined surfaces 17 and 17 are not limited to the one formed on the core insertion window 15 on one side, and the inclined surfaces 17 and 17 may be formed on the core insertion window 16 on the other side.
[0025]
Further, magnetic cores 6 and 7 having gap portions 6b and 7b that are attached to and integrated with a holder (not shown) or the like described in the prior art are accommodated in a shield case 13, and the core insertion window The gaps 6b and 7b side of the magnetic cores 6 and 7 are inserted into 15 and 16, and the tape sliding contact surfaces 6a and 7a are exposed from the core insertion windows 15 and 16 for positioning.
As shown in FIG. 3, the magnetic cores 6 and 7 are formed with width dimensions E and E '. Moreover, the space | interval between the protrusion parts 17a and 17a by the side of the end surfaces 15a and 15b of the core insertion window 15 is formed by the dimension f as shown in FIG.
[0026]
The width f of the core insertion window 15 is formed so as to satisfy the relationship f ≧ E. The magnetic core 6 is guided by the protrusions 17a and 17a so that the core insertion window 15 is inserted with very little play even if there is no play or play.
In addition, the width dimension G of the core insertion window 16 on the other side is formed such that G> E ′, and a predetermined gap is formed between the magnetic core 7 and the core insertion window 16.
The magnetic core 6 is inserted into the core insertion window 15 by inserting the tape sliding contact surface 6a side of the magnetic core 6 into the core insertion window 15 from below the inclined surfaces 17 and 17 shown in FIG. Then, since the corner portion of the magnetic core 6 on the tape sliding contact surface 6a side is guided by the inclined surfaces 17 and 17, the insertion workability does not deteriorate.
Since the magnetic cores 6 and 7 are integrated by the holder, when the magnetic core 6 on one side is inserted into the core insertion window 15, the other magnetic core 7 is also inserted into the core insertion portion 16 at the same time. It is supposed to be. As shown in FIG. 3, the magnetic material of the outer layer 13a of the tape sliding contact surface 14 and the tape sliding contact surfaces 6a and 7a of the magnetic cores 6 and 7 are substantially flush with each other.
[0027]
Further, a recess 18 is formed in the vicinity of the core insertion window 15 in a part on the tape sliding contact surface 14 side on the right side of the core insertion window 15 shown in FIG. As shown in FIG. 2, the bottom surface of the concave portion 18 is formed by a press or the like at the same position as the surface of the wear resistant material of the intermediate layer 13b.
When the magnetic cores 6 and 7 are inserted and positioned in the core insertion windows 15 and 16, the resin material 8 is filled into the shield case 13, and the magnetic cores 6 and 7 are sealed in the shield case 13 by the resin material 8. Fixed inside.
Then, as shown in FIG. 3, the tape sliding contact surface 14 of the shield case 13 is made up of the tape sliding contact surfaces 6a and 7a of the magnetic cores 6 and 7 and the tape sliding contact surface 14 of the shield case by a manufacturing method described later. Polish at the same time. By this polishing, the outer layer 3a of the magnetic material on the tape sliding contact surface 14 including the end surface 15a15b of the core insertion window 5 and the peripheral portions of the protrusions 17a and 17a is scraped, and the abrasion resistant material is applied to the tape sliding contact surface 14. The intermediate layer 13b is exposed. The tape sliding contact surfaces 6a and 7a of the magnetic cores 6 and 7 and the tape sliding contact surface 14 of the shield case 13 are in a mirror state to constitute the magnetic head 11 of the present invention.
[0028]
The manufacturing method of the magnetic head 11 of the present invention having the above-described configuration will be described with reference to FIGS. 1 to 6. First, the shield case 13 is drawn by a press or the like so that the inside is formed hollow. Yes.
Then, the core insertion windows 15 and 16 are punched and formed on the tape sliding contact surface 14 side of the shield case 13, and the end surface 15a located in the width direction of the magnetic tape (not shown) of the core insertion window 15 on one side. , 15b are formed with inclined surfaces 17 and 17 extending toward the inside of the shield case 13.
As shown in FIGS. 3 and 4, the inclined surfaces 17 and 17 are provided with projecting portions 17a and 17a having end surfaces in which a part of the end surface 15a or 15b side of the core insertion window 15 protrudes inward. The protrusions 17a and 17a projecting in the direction are formed at an angle α by press working or the like. And between this protrusion 17a, 17a is formed in the dimension f.
Further, when the core insertion window is punched and formed on the tape sliding contact surface 14, the concave portion 18 is formed simultaneously or in the same process.
[0029]
Next, when the magnetic core 6 is inserted into the core insertion window 15 in the step of restricting the position of the magnetic cores 6 and 7 by the inclined surfaces 17 and 17, the magnetic core 6 is guided to the inclined surfaces 17 and 17 and magnetically The tape sliding contact surface 6 a of the core 6 is sandwiched between the protrusions 17 a and 17 a and the position thereof is restricted, and the tape sliding contact surface 6 a is exposed from the core insertion window 15.
In addition, since the magnetic core 7 is integrated with the magnetic core 6 at a predetermined interval by the holder, the position of one magnetic core 6 is restricted as described above, so that the other magnetic core 7 is also The position is regulated in the core insertion window 16.
Therefore, there is almost no variation in the position of the magnetic cores 6 and 7 attached to the shield case 13, and the magnetic cores 6 and 6 are always located at substantially the same positions from the upper side surface 13d and the lower side surface 13e shown in FIG. 7 can be attached.
[0030]
Next, in the step of fixing the magnetic cores 6 and 7, the liquid resin material 8 is poured into the shield case 13, and the liquid resin material is solidified to fix the magnetic cores 6 and 7. Next, in the step of polishing the tape sliding contact surfaces 6a and 7a of the magnetic cores 6 and 7 and the tape sliding contact surface 14 of the shield case 13, at least the end surfaces 15a and 15b of the core insertion window 15 as shown in FIG. The peripheral portion and the peripheral portion of the recess 18 are polished, and the outer layer of the permalloy material on the tape sliding contact surface 14 is polished to expose the intermediate layer 13b of the wear resistant material.
Further, by polishing the tape sliding contact surface 14 of the shield case 13 including the protrusions 17a and 17a by the polishing step, end portions 17b and 17b of the stainless steel intermediate layer 13b are formed on the inclined surfaces 17 and 17, respectively. Is done. The end portions 17b and 17b made of stainless steel are substantially flush with the end surfaces 15a and 15b of the core insertion window 15.
And between the edge parts 17b and 17b, it forms in the same dimension F as the width dimension of the core insertion window 15, and the predetermined clearance gap h is formed in the magnetic core 6 and the core insertion window 15. FIG.
[0031]
In the magnetic head 11 of the present invention manufactured by such a manufacturing method, since the tape sliding contact surface 14 is in a mirror surface state by polishing, the stainless steel material is surely exposed on the tape sliding contact surface 14 after polishing. It was difficult to judge whether
Therefore, the magnetic head 11 of the present invention can be easily checked with the naked eye even if the stainless material of the intermediate layer 13b is excessively polished and the permalloy material of the inner layer 13c is exposed.
That is, if the stainless steel material of the intermediate layer 13b is excessively polished and the permalloy material of the inner layer 13c is exposed, the end portions 17b and 17b made of the stainless material of the inclined surfaces 17 and 17 are lost, and the inclined surface 17 as shown in FIG. The end portions 17c and 17c of the inner layer 13c are formed of a permalloy material, and the end portions 17c and 17c made of the inner layer 13c are formed to project outward from the end surfaces 15a and 15b of the core insertion window 15 to form a stepped shape. Is done. Therefore, if the end portions of the inclined surfaces 17 and 17 formed on part of the end surfaces 15a and 15b of the core insertion window 15 are observed, it can be easily determined whether or not the tape sliding contact surface 14 is properly polished. can do.
[0032]
Further, when the tape sliding contact surface 14 is polished and polished until the traces of the recesses 18 disappear from the surface of the tape sliding contact surface 14, it can be determined that the stainless material of the intermediate layer 13b is exposed.
That is, after the tape sliding contact surface 14 is polished, the tape sliding contact surface 14 has no trace of the recess 18 and protrudes outward from the end surfaces 15a, 15b of the core insertion window 15 as shown in FIG. If the end portions 17c and 17c of the inclined surface 17 are not formed, it can be easily determined that the tape sliding contact surface 14 is properly polished and the stainless material of the intermediate layer 13b is reliably exposed.
[0033]
In the embodiment of the magnetic head 11 of the present invention, the inclined surface 17 is described as being formed on part of the end surfaces 15a and 15b on both sides of the core insertion window 15. However, as shown in FIG. The magnetic cores 6 and 7 may be restricted in position by being formed only on the side surface 6 a and contacting the side surface 6 c of the magnetic core 6 with the protrusion 17 a of one inclined surface 17.
Further, the formation of the inclined surface 17 is not limited to the core insertion window 15 on one side, and may be formed on the core insertion window 16 on the other side.
[0034]
Further, as shown in FIG. 8, the inclined surfaces 17, 17 are formed on the end surfaces 15 a, 16 a of the two core insertion windows 15, 16 sandwiched between the two magnetic cores 6, 7, and the inclined surfaces 17, 17 are formed. The positions of the magnetic cores 6 and 7 may be regulated by the protrusions 17a and 17a.
[0035]
Further, as shown in FIG. 9, the inclined surfaces 17 and 17 are formed on the outer end surfaces 15b and 16b of the two core insertion windows 15 and 16, and the protrusions 17a and 17a of the inclined surfaces 17 and 17 are formed. The positions of the magnetic cores 6 and 7 may be restricted.
[0036]
【The invention's effect】
The magnetic head of the present invention includes a magnetic core having a gap portion and a shield case in which a core insertion window for inserting the magnetic core is provided on the tape sliding contact surface side. The shield case includes an outer layer, an intermediate layer, and an inner layer. It consists of a clad material or a laminated material having a three-layer structure, and the clad material or laminated material is composed of a magnetic material for both the outer layer and the inner layer, and the intermediate layer is composed of a wear-resistant material. At least one end surface located in the width direction of the tape is formed as an inclined surface extending toward the inside of the shield case, and the outer layer of the magnetic material on the tape sliding contact surface including the peripheral portion of the one end surface is cut. In addition, since the intermediate layer of the wear-resistant material is exposed, the guard member used in the conventional magnetic head becomes unnecessary, and the number of parts can be reduced and the number of assembly steps can be reduced. . Therefore, a low-cost magnetic head can be provided.
In addition, since the position of the magnetic core can be regulated by the inclined surface, there is almost no variation in the position of the magnetic core fixed with a resin material in the shield case. Therefore, the position adjustment with the erasing head needs only a slight fine adjustment, and the assembly time can be further reduced.
In addition, since different types of guard members as in the prior art are not required, a magnetic head free from problems such as assembly errors can be provided.
[0037]
Further, each of the two magnetic cores and the core insertion window has two magnetic cores and is positioned on the inner end face of the two core insertion windows sandwiched between the two magnetic cores or on the outer side of the two magnetic cores. Since the outer end surfaces of the two core insertion windows are formed as the inclined surfaces, the inclined core can improve the position accuracy of the magnetic core, and when the magnetic head of the present invention is attached to the apparatus side by the customer In addition, the mounting height of the magnetic head can be easily adjusted, and the assembly time on the apparatus side can be shortened.
[0038]
A magnetic core having a gap portion; and a shield case having a core insertion window for inserting the magnetic core provided on the tape sliding contact surface side, the shield case being a clad having a three-layer structure of an outer layer, an intermediate layer, and an inner layer The clad material or laminated material is composed of a magnetic material for both the outer layer and the inner layer, and the intermediate layer is made of a wear-resistant material, and the tape sliding contact side of the shield case. Since the concave portion is formed in a part of the tape, the outer portion of the magnetic material on the peripheral portion of the concave portion and the tape sliding contact surface is scraped, and the intermediate layer of the wear-resistant material is exposed. When the slidable contact surface is polished, the concave portion is also polished. When the trace of the concave portion is eliminated by the polishing, it can be determined that the intermediate layer of the wear-resistant material is exposed. Therefore, it is possible to perform appropriate polishing without insufficient polishing.
[0039]
Further, since the concave portion is formed in the vicinity of the core insertion window, the punch of the die for punching the core insertion window and the punch of the die for processing the concave portion can be arranged close to each other. The mold can be made small.
[0040]
In addition, since the bottom surface of the concave portion is located at the same position as the surface of the wear-resistant material of the intermediate layer, when the tape sliding contact surface is polished, if polishing is performed until there is no trace of the bottom surface of the concave portion, the tape sliding contact is achieved. It can be easily determined that the intermediate layer of the wear-resistant material is exposed on the surface.
[0041]
Further, at least one end surface of the core insertion window positioned in the width direction of the magnetic tape is formed as an inclined surface that extends toward the inside of the shield case, and the outer layer of the magnetic material around the one end surface is cut. Since the intermediate layer of the wear-resistant material is exposed, the position of the magnetic core can be regulated by the inclined surface, and the tape sliding contact surface until there is no trace of the bottom surface of the recess. Can be polished. Therefore, it is possible to provide a magnetic head in which the position of the magnetic core does not vary and the intermediate layer of the wear-resistant material is reliably exposed on the tape sliding contact surface.
[0042]
Further, since the thickness of the outer layer and the inner layer of the clad material or laminated material having the three-layer structure is formed to the same thickness, even if heat or the like is applied from the surroundings to the magnetic head of the present invention, the shield case is warped to one side. There is no such deformation. Therefore, a magnetic head having excellent heat resistance can be provided.
[0043]
Further, since the outer layer and the inner layer of the three-layered clad material or laminated material are formed thinner on the outer layer side than the inner layer side, the amount of polishing when the outer layer magnetic material is polished can be reduced, and the polishing time can be reduced. Can be shortened. Moreover, since the volume of the inner layer can be increased, the shielding effect can be improved.
[0044]
In the method of manufacturing the magnetic head according to the present invention, the outer layer and the inner layer are made of a magnetic material, and the intermediate layer is made of a clad material or a laminated material made of a wear resistant material. Forming a shield case in which a core insertion window is formed, and forming an inclined surface extending toward the inside of the shield case on at least one end surface of the core insertion window located in the width direction of the magnetic tape; Inserting the magnetic core into the insertion window and regulating the position of the magnetic core relative to the core insertion window with the inclined surface, and polishing the tape sliding contact surface of the magnetic core and the tape sliding contact surface of the shield case In the process, at least the peripheral portion of the one end surface and the outer layer of the magnetic material on the tape sliding contact surface were polished to expose the intermediate layer of the wear-resistant material. De member becomes unnecessary, with a small number of parts, and assembling steps can be reduced.
[0045]
The method of manufacturing a magnetic head according to the present invention includes the shield case provided with a protrusion having an end surface in which a part of the end surface side of the core insertion window protrudes inward, and protrudes inward. Forming the inclined surface on the end surface of the projecting portion, regulating the position of the magnetic core with respect to the core insertion window by the inclined surface of the projecting portion, and tape-sliding the magnetic core including the projecting portion. Since the step of polishing the contact surface and the tape-sliding contact surface of the shield case is provided, the position of the magnetic core can be accurately regulated by the protrusion. Further, when the protrusion is polished in the polishing step, the protrusion is shaved and the end of the inclined surface is formed of the wear-resistant material of the intermediate layer, and the end of the inclined surface made of the wear-resistant material; The end face of the core insertion window is substantially flush with the change of the shape of the core insertion window, and it can be easily determined whether or not proper polishing is performed.
[0046]
In the method of manufacturing the magnetic head according to the present invention, the outer layer and the inner layer are made of a magnetic material, and the intermediate layer is made of a clad material or a laminated material made of a wear resistant material. A shield case in which a core insertion window and a recess are formed, and in the step of polishing the tape sliding contact surface of the magnetic core and the tape sliding contact surface of the shield case, the peripheral portion of the recess and the tape sliding contact Since the outer layer of the magnetic material on the surface is polished to expose the intermediate layer of the wear-resistant material, it is determined that the intermediate layer of the wear-resistant material is exposed when there is no trace of the bottom surface of the recess in the polishing step. Can do. Therefore, it can be easily determined with the naked eye whether or not the polishing amount of the tape sliding contact surface is appropriate.
[0047]
The method of manufacturing a magnetic head according to the present invention includes the step of forming an inclined surface extending toward the inside of the shield case on at least one end surface of the core insertion window located in the width direction of the magnetic tape; A step of inserting a magnetic core into a window and regulating the position of the magnetic core with respect to the core insertion window by the inclined surface; a tape sliding contact surface including the tape sliding contact surface of the magnetic core and the concave portion of the shield case; In the step of polishing the outer peripheral layer of the magnetic material on the peripheral portion of the one end surface and the tape sliding contact surface to expose the intermediate layer of the wear-resistant material, the position of the magnetic core is regulated by the inclined surface. Thus, it is possible to provide a high-precision magnetic head free from variations in the position of the magnetic core.
[0048]
The method of manufacturing a magnetic head according to the present invention includes the shield case provided with a protrusion having an end surface in which a part of the end surface side of the core insertion window protrudes inward, and protrudes inward. Forming the inclined surface on the end surface of the projecting portion, regulating the position of the magnetic core with respect to the core insertion window by the inclined surface of the projecting portion, and tape-sliding the magnetic core including the projecting portion. A step of polishing the contact surface and the tape sliding contact surface including the concave portion of the shield case. By combining the concave portion and the protrusion, the tape sliding contact surface of the shield case is properly polished. Thus, it can be easily determined with the naked eye that the intermediate layer of the wear-resistant material is exposed.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view illustrating a magnetic head of the present invention.
FIG. 2 is a cross-sectional view of a main part of a shield case of a magnetic head according to the present invention.
FIG. 3 is a cross-sectional view of an essential part for explaining the relationship between a shield case and a magnetic core of the magnetic head of the present invention.
FIG. 4 is a schematic plan view illustrating the shape of a core insertion window before polishing of the magnetic head of the present invention.
FIG. 5 is a schematic plan view for explaining a change due to polishing of the core insertion window of the magnetic head of the present invention.
FIG. 6 is a schematic plan view for explaining changes due to polishing of the core insertion window of the magnetic head of the present invention.
FIG. 7 is a cross-sectional view illustrating another embodiment of the magnetic head of the present invention.
FIG. 8 is a cross-sectional view illustrating another embodiment of the magnetic head of the present invention.
FIG. 9 is a partial cross-sectional view illustrating another embodiment of the magnetic head of the present invention.
FIG. 10 is a schematic perspective view illustrating a conventional magnetic head.
FIG. 11 is a schematic perspective view for explaining a shield case of a conventional magnetic head.
FIG. 12 is a plan view illustrating a conventional magnetic head.
FIG. 13 is a cross-sectional view of an essential part for explaining a conventional method of manufacturing a magnetic head.
FIG. 14 is a fragmentary cross-sectional view for explaining a conventional method of manufacturing a magnetic head.
[Explanation of symbols]
6 Magnetic core
7 Magnetic core
8 Resin materials
11 Magnetic head
12 Erase head
13 Shield case
13a outer layer
13b intermediate layer
13c inner layer
13d upper side
13e bottom side
14 Tape sliding surface
15 core insertion window
15a end face
15b end face
16 Core insertion window
16a end face
16b end face
17 Inclined surface
17a protrusion
17b end
17c end
18 recess

Claims

A magnetic core having a gap portion, and a shield case in which a core insertion window for inserting the magnetic core is provided on the tape sliding contact surface side. The shield case is a clad material having a three-layer structure of an outer layer, an intermediate layer, and an inner layer, or The clad material or the laminated material is made of a magnetic material for both the outer layer and the inner layer, and the intermediate layer is made of a wear-resistant material. The core insertion window is positioned in the width direction of the magnetic tape. A pair of end faces opposed to each other , at least one of the end faces projecting inward of the core insertion window, and provided at the tip end face of the projecting part so as to expand into the shield case . an inclined surface, the outer layer of the with the magnetic core allows the position restricted by the projections the inclined surface is positioned, the magnetic material on the tape sliding surface of the projection at least the inclined surface is positioned Is shaved Magnetic head, characterized in that the intermediate layer of wear resistant material is exposed, one end side of the exposed said intermediate layer is without the one of said end faces and straight.

Wherein a two magnetic core and the core insertion window respectively, said to be located outside the two said end surface of the inner of the core insertion window or the two magnetic cores, sandwiched by the two magnetic cores the said end faces of the two outer core insertion window, the said projections inclined surface is provided is provided, said outer layer of magnetic material on the tape sliding surface is cut in the projections, abrasion 2. A magnetic head according to claim 1, wherein an intermediate layer of the material is exposed .

The portion of the tape sliding surface side of the shield case in a recess, the outer layer is scraped of the magnetic material on the peripheral portion of the concave portion the tape sliding surface, the intermediate layer of wear-resistant material 3. The magnetic head according to claim 1, wherein the magnetic head is exposed.

4. The magnetic head according to claim 3, wherein the recess is formed in the vicinity of the core insertion window.

The magnetic head according to claim 3 or 4, wherein in that the bottom face of the groove in the same position as the surface of the wear resistant material of the intermediate layer.

The magnetic head according to any one of claims 1 to 5, characterized in that the formation of the outer layer and the thickness of the inner layer of the clad material or laminate of the three-layer structure in the same thickness.

The thickness of the outer layer and the inner layer of the clad material or laminate of the three-layer structure, the magnetic head according to any one of claims 1 to 5, characterized in that the outer layer was thinner than the inner layer .

It has a shield case in which the outer layer and inner layer are made of a magnetic material, the intermediate layer is made of a clad material or a laminated material made of a wear-resistant material, and a core insertion window is formed on the tape sliding contact surface side. The core insertion window has a pair of end faces positioned in the width direction of the magnetic tape and facing each other, and at least one of the end faces protrudes inward of the core insertion window, the protrusion A step of forming an inclined surface extending toward the inside of the shield case at a tip end surface of the magnetic material, and a step of inserting a magnetic core into the core insertion window and restricting the position of the magnetic core with respect to the core insertion window by the inclined surface. And polishing the tape sliding contact surface of the magnetic core and the tape sliding contact surface of the shield case, the outer layer of the magnetic material on the tape sliding contact surface of the protrusion at least where the inclined surface is located. Polished To expose the intermediate layer of wear resistant material, method of manufacturing the magnetic head is characterized in that one end of the exposed said intermediate layer is made a one of said end surface and a straight line.

The magnetic core and the core insertion window each have two, and the end face inside the two core insertion windows sandwiched between the two magnetic cores or the outside of the two magnetic cores The protrusions provided with the inclined surfaces are provided on the end faces outside the two core insertion windows, and the outer layer of the magnetic material on the tape-sliding contact surface of the protrusions is shaved to wear resistance. 9. The method of manufacturing a magnetic head according to claim 8, wherein the intermediate layer of the material is exposed .

In the shield case, a concave portion is formed on the tape sliding contact surface side, and in the step of polishing the tape sliding contact surface of the magnetic core and the tape sliding contact surface of the shield case, the peripheral portion of the concave portion and the tape 10. The method of manufacturing a magnetic head according to claim 8, wherein the outer layer of the magnetic material on the sliding surface is polished to expose the intermediate layer of the wear-resistant material .

The method of manufacturing a magnetic head according to claim 10, wherein the recess is formed in the vicinity of the core insertion window .

12. The method of manufacturing a magnetic head according to claim 10, wherein the bottom surface of the recess is located at the same position as the surface of the wear resistant material of the intermediate layer .

13. The method of manufacturing a magnetic head according to claim 8 , wherein the outer layer and the inner layer of the clad material or laminated material having the three-layer structure are formed to have the same thickness .

13. The magnetic head according to claim 8, wherein the outer layer and the inner layer of the three-layered clad material or laminated material are formed such that the outer layer side is thinner than the inner layer side. Manufacturing method.