JP3669909B2

JP3669909B2 - Magnetic head

Info

Publication number: JP3669909B2
Application number: JP2000276620A
Authority: JP
Inventors: 賢桑原; 真裕美山木
Original assignee: Alps Electric Co Ltd
Current assignee: Alps Alpine Co Ltd
Priority date: 2000-09-07
Filing date: 2000-09-07
Publication date: 2005-07-13
Anticipated expiration: 2020-09-07
Also published as: JP2002092812A

Description

【０００１】
【発明の属する技術分野】
本発明は磁気記録再生装置に用いられる磁気ヘッドに係り、特にトラック幅規制溝及び補強溝にガラスを充填した磁気ヘッドに関する。
【０００２】
【従来の技術】
従来のこの種の磁気ヘッドは、例えば、図１８乃至図２０に示すように、ＭｎＺｎ単結晶フェライト等の強磁性体からなる第１，第２の磁気コア半体３１，３２を備えてなり、これら第１，第２の磁気コア半体３１，３２の一面３１ａ，３２ａ同士が突き合わされて、磁気記録媒体が摺動する上端面３３に、磁気ギャップ３４とこの磁気ギャップ３４のトラック幅Ｔｗを規制するトラック幅規制溝５とが形成され、上端面３３の反対側の下端面３６に、この下端面３６から上端面３３に向かうに従い磁気記録媒体の摺動方向（矢印Ａ方向）の幅が漸次狭くなる補強溝３７が設けられて、トラック幅規制溝３５及び補強溝３７にガラス３８が充填されている（尚、図１９ではガラス３８に対し斜線帯を付した）。
【０００３】
そして、トラック幅規制溝３５が、第１の磁気コア半体３１の一面３１ａの上端側から下端側に向かって延びる両縁に設けられた第１のテーパ部３９と、第２の磁気コア半体３２の一面３２ａの上端側から下端側に向かって延びる両縁に設けられた第２のテーパ部４２とによって構成され、補強溝３７が、第１の磁気コア半体３１の一面３１ａの下端面３６側に第１のテーパ部３９と交叉するように形成された第１の傾斜面４０と、第２の磁気コア半体３２の一面３２ａの下端面３６側に第２のテーパ部４２と交叉するように形成された第２の傾斜面４３とにより構成されており、トラック幅規制溝３５と補強溝３７とが連通した状態となっている。また、第１，第２の磁気コア半体３１，３２の一面３１ａ，３２ａには、巻線溝４１，４４がそれぞれ第１，第２のテーパ部３９，４２を分断するように形成され、この巻線溝４１，４４を利用して第１，第２の磁気コア半体３１，３２に図示せぬ導電コイルが巻装されている。
【０００４】
このように構成された従来の磁気ヘッドの製造は、先ず、図２１，図２２に示すように、ＭｎＺｎ単結晶フェライト等の強磁性体からなる第１，第２のコアブロック４５，４６を用意する。次に、図２３に示すように、第１のコアブロック４５の一面にその長手方向に沿って巻線溝４１とガラス挿入溝４７とを形成し、また、図２４に示すように、第２のコアブロック４６の一面にその長手方向に沿って巻線溝４４とガラス挿入溝４８とを形成する。
【０００５】
次に、図２５に示すように、第１のコアブロック４５の一面にその短手方向に沿って複数の切欠溝４９を長手方向に一定間隔を置いて形成することによって複数の突部５０，５１，５２を形成し、また、図２６に示すように、第２のコアブロック４６の一面にその短手方向に沿って複数の切欠溝５３を長手方向に一定間隔を置いて形成することによって複数の突部５４，５５，５６を形成する。次に、図２７に示すように、第１のコアブロック４５の突部５０，５１，５２に第１のテーパ部３９を形成して、突部５０の端部に傾斜面５７を付けるとともに、突部５１の端部に補強溝３７を構成する第１の傾斜面４０を形成し、また、図２８に示すように、第２のコアブロック４６の突部５４，５５，５６には第２のテーパ部４２を形成し、突部５４の端部に傾斜面５８を付けるとともに、突部５５の端部に補強溝３７を構成する第２の傾斜面４３を形成する。
【０００６】
次いで、第１，第２のコアブロック４５，４６の一面にそれぞれ磁性膜と非磁性膜とを順次スパッタリング等の真空薄膜形成技術により成膜し、図２９に示すように、第１，第２のコアブロック４５，４６の一面同士を突き合わせ、第１，第２のテーパ部３９，４２でトラック幅規制溝３５を構成させ、第１，第２の傾斜面４０，４３で補強溝３７を構成させる。
【０００７】
次に、図３０，図３１に示すように、棒状に形成された２本のガラス３８，３８の一方を第１，第２のコアブロック４５，４６の突き合わせ部分に配置し、他方のガラス３８をガラス挿入溝４７，４８内に配置して第１，第２の傾斜面４０，４３に当接させ、この状態で両ガラス３８，３８を加熱溶融すると、第１，第２のコアブロック４５，４６の突き合わせ部分に配置された一方のガラス３８が切欠溝４９，５３及びトラック幅規制溝３５に流れ込み、ガラス挿入溝４７，４８内に配置された他方のガラス３８が補強溝３７から毛細管現象により切欠溝４９，５３及びトラック幅規制溝３５に浸透し、切欠溝４９，５３及びトラック幅規制溝３５内に両ガラス３８，３８が充填されることにより第１，第２のコアブロック４５，４６が一体化される。
【０００８】
そして、第１，第２のコアブロック４５，４６に切削加工を施して図３２に示す状態とした後、この第１，第２のコアブロック４５，４６を一点鎖線Ｄ−Ｄ及び一点鎖線Ｅ−Ｅに沿って切断し、こうして得られた第１，第２の磁気コア半体３１，３２に巻線溝４１，４４を利用して図示せぬ導電コイルを巻装することにより、図１８乃至図２０に示す従来の磁気ヘッドの製造が完了する。
【０００９】
このようにして従来の磁気ヘッドの製造は完了するが、製造後においては、図１９に示すように、補強溝３７を構成する第１，第２の傾斜面４０，４３のなす角θが９０°に設定された状態となっている。このため、第１，第２のコアブロック４５，４５を一体化する際には、図３１に示すように、ガラス挿入溝４７，４８内に配置された他方のガラス３８と補強溝３７の上端との間にクリアランスＣが大きく生ずるようになっていた。
【００１０】
【発明が解決しようとする課題】
しかしながら、上述した従来の磁気ヘッドにあっては、第１，第２のコアブロック４５，４６を一体化する際に、加熱溶融された他方のガラス３８が補強溝３７から切欠溝４９，５３及びトラック幅規制溝３５内に充分に行き渡らず、その結果、図３３に示すように、切欠溝４９，５３及びトラック幅規制溝３５が他方のガラス３８で満たされず、巻線溝４１，４４の下端と補強溝３７の上端との間の長さＢの半分程度がガラス未充填部５９となることがあった（尚、図３３では他方のガラス３８に対し斜線帯を付した）。
【００１１】
このようにガラス未充填部５９の長さＦが巻線溝４１，４４の下端と補強溝３７の上端との間の長さＢの半分程度になると、ガラス未充填部５９における第１，第２のコアブロック４５，４６の強度が弱くなり、第１，第２の磁気コア半体３１，３２にするための切削加工や切断の段階で、これらにひび割れ６０等が発生し製造歩留まりが著しく低下するととなる。
【００１２】
本発明は上述した事情に鑑みてなされたもので、その目的は、ガラス未充填部の長さを極力小さくし、製造歩留まりを向上することが可能な磁気ヘッドを提供することにある。
【００１３】
【課題を解決するための手段】
上記目的を達成するために、本発明の磁気ヘッドは、強磁性体からなる第１，第２の磁気コア半体を備えてなり、前記第１，第２の磁気コア半体の一面同士が突き合わされて、磁気記録媒体が摺動する上端面に、磁気ギャップとこの磁気ギャップのトラック幅を規制するトラック幅規制溝とが形成され、前記上端面の反対側の下端面に、この下端面から前記上端面に向かうに従い前記磁気記録媒体の摺動方向の幅が漸次狭くなる補強溝が設けられ、前記第１，第２の磁気コア半体の少なくとも一方の前記一面には巻線溝が形成され、前記トラック幅規制溝及び前記補強溝にガラスが充填されており、前記第１の磁気コア半体の前記一面には、前記上端面側から前記下端面側に向かって延びる両縁に第１のテーパ部が設けられ、前記第１の磁気コア半体の前記一面の前記下端面側に、前記第１のテーパ部と交叉する第１の傾斜面が形成されているとともに、前記第２の磁気コア半体の前記一面には、前記上端面側から前記下端面側に向かって延びる両縁に第２のテーパ部が設けられ、前記第２の磁気コア半体の前記一面の前記下端面側に、前記第２のテーパ部と交叉する第２の傾斜面が形成されて、前記トラック幅規制溝が前記第１，第２のテーパ部によって構成され、前記補強溝が前記第１，第２の傾斜面により構成され、前記トラック幅規制溝と前記補強溝とが連通し、前記第１，第２の傾斜面のなす角が９４°以上の範囲に設定されていることを最も主要な特徴としている。
【００１４】
また、上記構成において、前記補強溝の上端から前記巻線溝の下端までの距離が０．９ｍｍ以下に設定されている構成とした。
【００１５】
【発明の実施の形態】
以下、本発明の磁気ヘッドの一実施形態を図１乃至図１７に基づいて説明する。
【００１６】
図１乃至図３に示すように、この磁気ヘッドは、ＭｎＺｎ単結晶フェライト等の強磁性体からなる第１，第２の磁気コア半体１，２を備えてなり、これら第１，第２の磁気コア半体１，２の一面１ａ，２ａ同士が突き合わされて、磁気記録媒体が摺動する上端面３に、磁気ギャップ４とこの磁気ギャップ４のトラック幅Ｔｗを規制するトラック幅規制溝５とが形成され、上端面３の反対側の下端面６に、この下端面６から上端面３に向かうに従い磁気記録媒体の摺動方向（矢印Ａ方向）の幅が漸次狭くなる補強溝７が設けられて、トラック幅規制溝５及び補強溝７にガラス８が充填された構造となっている（尚、図２ではガラス８に対し斜線帯を付した）。
【００１７】
第１の磁気コア半体１の一面１ａには、上端面３側から下端面６側に向かって延びる両縁に第１のテーパ部９が設けられ、下端面６側にこの第１のテーパ部９と交叉する第１の傾斜面１０が形成されており、巻線溝１１が第１のテーパ部９を分断するように形成されている。
【００１８】
また、第２の磁気コア半体２の一面２ａには、上端面３側から下端面６側に向かって延びる両縁に第２のテーパ部１２が設けられ、下端面６側にこの第２のテーパ部１２と交叉する第２の傾斜面１３が形成されており、巻線溝１４が第２のテーパ部１２を分断するように形成されている。
【００１９】
そして、トラック幅規制溝５が第１，第２のテーパ部９，１２によって構成され、補強溝７が第１，第２の傾斜面１０，１３により構成されて、第１，第２の傾斜面１０，１３のなす角θが磁気ギャップ４を通り上端面３側から下端面６側に向かって第１，第２の磁気コア半体１，２の一面１ａ，２ａと平行に延びる直線（不図示）によって二等分されるようになっており、このなす角θが１０６°に設定されトラック幅規制溝５と補強溝７とが連通した状態になっている。
【００２０】
次に、このように構成された磁気ヘッドの製造方法を説明すると、先ず、図４，図５に示すように、ＭｎＺｎ単結晶フェライト等の強磁性体からなる第１，第２のコアブロック１５，１６を用意する。次に、図６に示すように、第１のコアブロック１５の一面にその長手方向に沿って巻線溝１１とガラス挿入溝１７とを形成し、また、図７に示すように、第２のコアブロック１６の一面にその長手方向に沿って巻線溝１４とガラス挿入溝１８とを形成する。
【００２１】
次に、図８に示すように、第１のコアブロック１５の一面にその短手方向に沿って複数の切欠溝１９を長手方向に一定間隔を置いて形成することによって複数の突部２０，２１，２２を形成し、また、図９に示すように、第２のコアブロック１６の一面にその短手方向に沿って複数の切欠溝２３を長手方向に一定間隔を置いて形成することによって複数の突部２４，２５，２６を形成する。次に、図１０に示すように、第１のコアブロック１５の突部２０，２１，２２に第１のテーパ部９を形成して、突部２０の端部に傾斜面２７を付けるとともに、突部２１の端部に補強溝７を構成する第１の傾斜面１０を形成し、また、図１１に示すように、第２のコアブロック１６の突部２４，２５，２６には第２のテーパ部１２を形成し、突部２４の端部に傾斜面２８を付けるとともに、突部２５の端部に補強溝７を構成する第２の傾斜面１３を形成する。
【００２２】
次いで、第１，第２のコアブロック１５，１６の一面にそれぞれ磁性膜と非磁性膜とを順次スパッタリング等の真空薄膜形成技術により成膜し、図１２に示すように、第１，第２のコアブロック１５，１６の一面同士を突き合わせ、第１，第２のテーパ部９，１２でトラック幅規制溝５を構成させ、第１，第２の傾斜面１０，１３で補強溝７を構成させる。
【００２３】
次に、図１３，図１４に示すように、棒状に形成された２本のガラス８，８の一方を第１，第２のコアブロック１５，１６の突き合わせ部分に配置し、他方のガラス８をガラス挿入溝１７，１８内に配置して第１，第２の傾斜面１０，１３に当接させ、この状態で両ガラス８，８を加熱溶融すると、第１，第２のコアブロック１５，１６の突き合わせ部分に配置された一方のガラス８が切欠溝１９，２３及びトラック幅規制溝５に流れ込み、ガラス挿入溝１７，１８内に配置された他方のガラス８が補強溝７から毛細管現象により切欠溝１９，２３及びトラック幅規制溝５に浸透し、切欠溝１９，２３及びトラック幅規制溝５内に両ガラス８，８が充填されることにより第１，第２のコアブロック１５，１６が一体化される。
【００２４】
そして、第１，第２のコアブロック１５，１６に切削加工を施して図１５に示す状態とした後、この第１，第２のコアブロック１５，１６を一点鎖線Ｄ−Ｄ及び一点鎖線Ｅ−Ｅに沿って切断し、こうして得られた第１，第２の磁気コア半体１，２に巻線溝１１，１４を利用して図示せぬ導電コイルを巻装することにより、図１乃至図３に示す磁気ヘッドの製造が完了する。
【００２５】
しかして、このように構成・製造された磁気ヘッドにあっては、第１，第２のコアブロック１５，１６を一体化する際に、図１４に示すように、補強溝７を構成する第１，第２の傾斜面１０，１３のなす角θが１０６°に設定されているので、ガラス挿入溝１７，１８内に配置された他方のカラス８と補強溝７の上端との間に生ずるクリアランスＣが従来技術と比較して小さくなり、加熱溶融された他方のガラス８が補強溝７の上端に速やかに到達することができることから、他方のガラス８が補強溝７から切欠溝１９，２３及びトラック幅規制溝５内に容易に浸透して充分に行き渡り、切欠溝１９，２３及びトラック幅規制溝５が他方のガラス８で満たされないというような前述したガラス未充填部５９が、切欠溝１９，２３及びトラック幅規制溝５内の巻線溝１１，１４の下端下に生じるのを抑制し、ガラス未充填部５９の長さＦを巻線溝１１，１４の下端と補強溝７の上端との間の長さＢに対して極めて小さくすることができる。
【００２６】
図１６は、巻線溝１１，１４の下端と補強溝７の上端との間の長さＢを０．８３ｍｍとし、補強溝７を構成する第１，第２の傾斜面１０，１３のなす角θを変えて測定したガラス未充填部５９の長さＦの平均値を示すグラフである。これより、第１，第２の傾斜面１０，１３のなす角θが９０°のときに、ガラス未充填部５９の長さＦが巻線溝１１，１４の下端と補強溝７の上端との間の長さＢの４６％を占める３８２μｍであったものが、第１，第２の傾斜面１０，１３のなす角θを大きくするに従いガラス未充填部５９の長さＦが小さくなっていくのが見て取れる。
【００２７】
そして、第１，第２の磁気コア半体１，２にするための切削加工や切断の段階で第１，第２のコアブロック１５，１６に発生する前述したひび割れ６０が、第１，第２の傾斜面１０，１３のなす角θを９４°以上にしたときに殆ど無くなり、第１，第２の傾斜面１０，１３のなす角θを１００°以上にしたときにはガラス未充填部５９の長さＦが５０μｍ以下になって、ひび割れ６０の発生が完全に無くなった。この結果より第１，第２の傾斜面１０，１３のなす角θを９４°以上にすることによって製造歩留まりを向上でき、更に第１，第２の傾斜面１０，１３のなす角θを１００°以上にすることにより製造歩留まりを大幅に向上できることが判る。
【００２８】
また、図１７は、補強溝７を構成する第１，第２の傾斜面１０，１３のなす角θを１０６°とし、巻線溝１１，１４の下端と補強溝７の上端との間の長さＢを変えて測定したガラス未充填部５９の長さＦの平均値を示すグラフである。これより、巻線溝１１，１４の下端と補強溝７の上端との間の長さＢが１．００ｍｍのときに、ガラス未充填部５９の長さＦが１５１．８７ｍｍであったものが、巻線溝１１，１４の下端と補強溝７の上端との間の長さＢを小さくするに従いガラス未充填部５９の長さＦが小さくなっていくのが見て取れる。
【００２９】
そして、巻線溝１１，１４の下端と補強溝７の上端との間の長さＢを０．９ｍｍ以下にしたときにガラス未充填部５９の長さＦが７０μｍ以下になって、第１，第２の磁気コア半体１，２にするための切削加工や切断の段階で第１，第２のコアブロック１５，１６に前述したひび割れ６０が発生することが完全に無くなった。この結果より補強溝５を構成する第１，第２の傾斜面９，１２のなす角θの角度範囲を規定するのに加え、巻線溝１１，１４の下端と補強溝５の上端との間の長さＢを０．９ｍｍ以下にすることによって製造歩留まりを一層大幅に向上できることが判る。
【００３０】
【発明の効果】
本発明は、以上説明したような形態で実施され、以下に記載されるような効果を奏する。
【００３１】
本発明の磁気ヘッドは、強磁性体からなる第１，第２の磁気コア半体を備えてなり、前記第１，第２の磁気コア半体の一面同士が突き合わされて、磁気記録媒体が摺動する上端面に、磁気ギャップとこの磁気ギャップのトラック幅を規制するトラック幅規制溝とが形成され、前記上端面の反対側の下端面に、この下端面から前記上端面に向かうに従い前記磁気記録媒体の摺動方向の幅が漸次狭くなる補強溝が設けられ、前記第１，第２の磁気コア半体の少なくとも一方の前記一面には巻線溝が形成され、前記トラック幅規制溝及び前記補強溝にガラスが充填されており、前記第１の磁気コア半体の前記一面には、前記上端面側から前記下端面側に向かって延びる両縁に第１のテーパ部が設けられ、前記第１の磁気コア半体の前記一面の前記下端面側に、前記第１のテーパ部と交叉する第１の傾斜面が形成されているとともに、前記第２の磁気コア半体の前記一面には、前記上端面側から前記下端面側に向かって延びる両縁に第２のテーパ部が設けられ、前記第２の磁気コア半体の前記一面の前記下端面側に、前記第２のテーパ部と交叉する第２の傾斜面が形成されて、前記トラック幅規制溝が前記第１，第２のテーパ部によって構成され、前記補強溝が前記第１，第２の傾斜面により構成され、前記トラック幅規制溝と前記補強溝とが連通し、前記第１，第２の傾斜面のなす角が９４°以上の範囲に設定されているので、ガラス未充填部の長さを極力小さくし、製造歩留まりを向上することが可能となる。
【００３２】
また、前記補強溝の上端から前記巻線溝の下端までの距離が０．９ｍｍ以下に設定されているので、製造歩留まりの一層大幅な向上を図ることができる。
【図面の簡単な説明】
【図１】本発明の磁気ヘッドの平面図。
【図２】本発明の磁気ヘッドの正面図。
【図３】本発明の磁気ヘッドの底面図。
【図４】本発明の磁気ヘッドに備わる第１の磁気コア半体となるべき第１のコアブロックの斜視図。
【図５】本発明の磁気ヘッドに備わる第２の磁気コア半体となるべき第２のコアブロックの斜視図。
【図６】本発明の磁気ヘッドに備わる第１の磁気コア半体となるべき第１のコアブロックに巻線溝とガラス挿入溝とを形成した状態を示す斜視図。
【図７】本発明の磁気ヘッドに備わる第２の磁気コア半体となるべき第２のコアブロックに巻線溝とガラス挿入溝とを形成した状態を示す斜視図。
【図８】本発明の磁気ヘッドに備わる第１の磁気コア半体となるべき第１のコアブロックに複数の切欠溝を形成することにより複数の突部を形成した状態を示す斜視図。
【図９】本発明の磁気ヘッドに備わる第２の磁気コア半体となるべき第２のコアブロックに複数の切欠溝を形成することにより複数の突部を形成した状態を示す斜視図。
【図１０】本発明の磁気ヘッドに備わる第１の磁気コア半体となるべき第１のコアブロックに形成された複数の突部に第１のテーパ部及び第１の傾斜面を形成した状態を示す斜視図。
【図１１】本発明の磁気ヘッドに備わる第２の磁気コア半体となるべき第２のコアブロックに形成された複数の突部に第２のテーパ部及び第２の傾斜面を形成した状態を示す斜視図。
【図１２】本発明の磁気ヘッドに備わる第１，第２の磁気コア半体となるべき第１，第２のコアブロックを突き合わせた状態を示す斜視図。
【図１３】本発明の磁気ヘッドに備わる第１，第２の磁気コア半体となるべき第１，第２のコアブロックの突き合わせ部分及び第１，第２のガラス挿入溝内に各々ガラスを配置した状態を示す斜視図。
【図１４】本発明の磁気ヘッドに備わる第１，第２の磁気コア半体となるべき第１，第２のコアブロックの突き合わせ部分及び第１，第２のガラス挿入溝内に各々ガラスを配置した状態を示す断面図。
【図１５】本発明の磁気ヘッドに備わる第１，第２の磁気コア半体となるべき一体化された第１，第２のコアブロックに切削加工を施した状態を示す斜視図。
【図１６】補強溝を構成する第１，第２の傾斜面のなす角とガラス未充填部の平均長さとの関係を表すグラフを示す図。
【図１７】巻線溝の下端と補強溝の上端との間の長さとガラス未充填部の平均長さとの関係を表すグラフを示す図。
【図１８】従来の磁気ヘッドの平面図。
【図１９】従来の磁気ヘッドの正面図。
【図２０】従来の磁気ヘッドの底面図。
【図２１】従来の磁気ヘッドに備わる第１の磁気コア半体となるべき第１のコアブロックの斜視図。
【図２２】従来の磁気ヘッドに備わる第２の磁気コア半体となるべき第２のコアブロックの斜視図。
【図２３】従来の磁気ヘッドに備わる第１の磁気コア半体となるべき第１のコアブロックに巻線溝とガラス挿入溝とを形成した状態を示す斜視図。
【図２４】従来の磁気ヘッドに備わる第２の磁気コア半体となるべき第２のコアブロックに巻線溝とガラス挿入溝とを形成した状態を示す斜視図。
【図２５】従来の磁気ヘッドに備わる第１の磁気コア半体となるべき第１のコアブロックに複数の切欠溝を形成することにより複数の突部を形成した状態を示す斜視図。
【図２６】従来の磁気ヘッドに備わる第２の磁気コア半体となるべき第２のコアブロックに複数の切欠溝を形成することにより複数の突部を形成した状態を示す斜視図。
【図２７】従来の磁気ヘッドに備わる第１の磁気コア半体となるべき第１のコアブロックに形成された複数の突部に第１のテーパ部及び第１の傾斜面を形成した状態を示す斜視図。
【図２８】従来の磁気ヘッドに備わる第２の磁気コア半体となるべき第２のコアブロックに形成された複数の突部に第２のテーパ部及び第２の傾斜面を形成した状態を示す斜視図。
【図２９】従来の磁気ヘッドに備わる第１，第２の磁気コア半体となるべき第１，第２のコアブロックを突き合わせた状態を示す斜視図。
【図３０】従来の磁気ヘッドに備わる第１，第２の磁気コア半体となるべき第１，第２のコアブロックの突き合わせ部分及び第１，第２のガラス挿入溝内に各々ガラスを配置した状態を示す斜視図。
【図３１】従来の磁気ヘッドに備わる第１，第２の磁気コア半体となるべき第１，第２のコアブロックの突き合わせ部分及び第１，第２のガラス挿入溝内に各々ガラスを配置した状態を示す断面図。
【図３２】従来の磁気ヘッドに備わる第１，第２の磁気コア半体となるべき一体化された第１，第２のコアブロックに切削加工を施した状態を示す斜視図。
【図３３】従来の磁気ヘッドの課題を説明するための要部断面図。
【符号の説明】
１第１の磁気コア半体
１ａ一面
２第２の磁気コア半体
２ａ一面
３上端面
４磁気ギャップ
５トラック幅規制溝
６下端面
７補強溝
８ガラス
９第１のテーパ部
１０第１の傾斜面
１１巻線溝
１２第２のテーパ部
１３第２の傾斜面
１４巻線溝
１５第１のコアブロック
１６第２のコアブロック
１７ガラス挿入溝
１８ガラス挿入溝
１９切欠溝
２０突部
２１突部
２２突部
２３切欠溝
２４突部
２５突部
２６突部
２７傾斜面
２８傾斜面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic head used in a magnetic recording / reproducing apparatus, and more particularly to a magnetic head in which a track width regulating groove and a reinforcing groove are filled with glass.
[0002]
[Prior art]
A conventional magnetic head of this type includes first and second magnetic core halves 31 and 32 made of a ferromagnetic material such as MnZn single crystal ferrite, as shown in FIGS. The surfaces 31a and 32a of the first and second magnetic core halves 31 and 32 are abutted with each other, and the magnetic gap 34 and the track width Tw of the magnetic gap 34 are set on the upper end surface 33 on which the magnetic recording medium slides. A track width regulating groove 5 to be regulated is formed, and the width in the sliding direction (arrow A direction) of the magnetic recording medium is formed on the lower end surface 36 opposite to the upper end surface 33 from the lower end surface 36 toward the upper end surface 33. Reinforcing grooves 37 that are gradually narrowed are provided, and the track width restricting grooves 35 and the reinforcing grooves 37 are filled with glass 38 (note that a hatched band is attached to the glass 38 in FIG. 19).
[0003]
The track width restricting groove 35 includes a first taper portion 39 provided on both edges extending from the upper end side to the lower end side of the one surface 31a of the first magnetic core half body 31, and the second magnetic core half portion. And the second tapered portion 42 provided on both edges extending from the upper end side to the lower end side of the one surface 32a of the body 32, and the reinforcing groove 37 is formed below the one surface 31a of the first magnetic core half 31. A first inclined surface 40 formed so as to cross the first tapered portion 39 on the end surface 36 side, and a second tapered portion 42 on the lower end surface 36 side of the one surface 32a of the second magnetic core half body 32. The second inclined surface 43 is formed so as to intersect, and the track width regulating groove 35 and the reinforcing groove 37 communicate with each other. In addition, the winding grooves 41 and 44 are formed on the first surfaces 31a and 32a of the first and second magnetic core halves 31 and 32 so as to divide the first and second tapered portions 39 and 42, respectively. A conductive coil (not shown) is wound around the first and second magnetic core halves 31 and 32 using the winding grooves 41 and 44.
[0004]
In manufacturing the conventional magnetic head constructed as described above, first and second core blocks 45 and 46 made of a ferromagnetic material such as MnZn single crystal ferrite are prepared as shown in FIGS. To do. Next, as shown in FIG. 23, a winding groove 41 and a glass insertion groove 47 are formed along the longitudinal direction on one surface of the first core block 45, and as shown in FIG. A winding groove 44 and a glass insertion groove 48 are formed on one surface of the core block 46 along the longitudinal direction thereof.
[0005]
Next, as shown in FIG. 25, a plurality of protrusions 50 are formed on the surface of the first core block 45 by forming a plurality of cutout grooves 49 along the short direction at regular intervals in the longitudinal direction. In addition, as shown in FIG. 26, a plurality of cutout grooves 53 are formed on one surface of the second core block 46 along the short direction at regular intervals in the longitudinal direction. A plurality of protrusions 54, 55, and 56 are formed. Next, as shown in FIG. 27, the first taper portion 39 is formed on the protrusions 50, 51, 52 of the first core block 45, and the inclined surface 57 is attached to the end of the protrusion 50, The first inclined surface 40 constituting the reinforcing groove 37 is formed at the end of the protrusion 51, and the protrusions 54, 55, and 56 of the second core block 46 have second protrusions as shown in FIG. The tapered portion 42 is formed, an inclined surface 58 is attached to the end portion of the protruding portion 54, and a second inclined surface 43 constituting the reinforcing groove 37 is formed at the end portion of the protruding portion 55.
[0006]
Next, a magnetic film and a nonmagnetic film are sequentially formed on one surface of the first and second core blocks 45 and 46 by a vacuum thin film forming technique such as sputtering, as shown in FIG. The first and second taper portions 39 and 42 constitute a track width regulating groove 35, and the first and second inclined surfaces 40 and 43 constitute a reinforcing groove 37. Let
[0007]
Next, as shown in FIGS. 30 and 31, one of the two glasses 38, 38 formed in a rod shape is arranged at the abutting portion of the first and second core blocks 45, 46, and the other glass 38. Is placed in the glass insertion grooves 47 and 48 and brought into contact with the first and second inclined surfaces 40 and 43. When both the glasses 38 and 38 are heated and melted in this state, the first and second core blocks 45 are placed. 46, one glass 38 disposed in the butted portion flows into the notch grooves 49, 53 and the track width regulating groove 35, and the other glass 38 disposed in the glass insertion grooves 47, 48 capillarizes from the reinforcing groove 37. Penetrating into the notch grooves 49, 53 and the track width regulating groove 35, and filling the both glasses 38, 38 into the notch grooves 49, 53 and the track width regulating groove 35, thereby the first and second core blocks 45, 46 is one It is of.
[0008]
Then, after cutting the first and second core blocks 45 and 46 into the state shown in FIG. 32, the first and second core blocks 45 and 46 are changed to a one-dot chain line DD and a one-dot chain line E. By cutting along the line E and winding a conductive coil (not shown) on the first and second magnetic core halves 31 and 32 thus obtained using the winding grooves 41 and 44, FIG. Through the manufacture of the conventional magnetic head shown in FIG.
[0009]
In this way, the manufacturing of the conventional magnetic head is completed. After the manufacturing, as shown in FIG. 19, the angle θ formed by the first and second inclined surfaces 40 and 43 constituting the reinforcing groove 37 is 90. It is set to °. For this reason, when integrating the first and second core blocks 45, 45, as shown in FIG. 31, the other glass 38 disposed in the glass insertion grooves 47, 48 and the upper end of the reinforcing groove 37 A large clearance C occurs between the two.
[0010]
[Problems to be solved by the invention]
However, in the above-described conventional magnetic head, when the first and second core blocks 45 and 46 are integrated, the other glass 38 heated and melted is cut from the reinforcing groove 37 to the cutout grooves 49 and 53 and As a result, as shown in FIG. 33, the notch grooves 49 and 53 and the track width restriction groove 35 are not filled with the other glass 38, and the lower ends of the winding grooves 41 and 44 are not sufficiently spread into the track width restriction groove 35. In some cases, about half of the length B between the upper end of the reinforcing groove 37 and the upper end of the reinforcing groove 37 becomes the glass unfilled portion 59 (in FIG. 33, the other glass 38 is hatched).
[0011]
Thus, when the length F of the glass unfilled portion 59 is about half of the length B between the lower ends of the winding grooves 41 and 44 and the upper end of the reinforcing groove 37, the first and first glass unfilled portions 59 have the first and first lengths. The strength of the core blocks 45 and 46 of the second core is weakened, and cracks 60 and the like are generated in the cutting and cutting stages for forming the first and second magnetic core halves 31 and 32, so that the manufacturing yield is remarkably increased. It will decrease.
[0012]
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a magnetic head capable of reducing the length of a glass unfilled portion as much as possible and improving the manufacturing yield.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, a magnetic head of the present invention comprises first and second magnetic core halves made of a ferromagnetic material, and one surface of each of the first and second magnetic core halves is formed between them. A magnetic gap and a track width regulating groove for regulating the track width of the magnetic gap are formed on the upper end surface where the magnetic recording medium slides against each other, and the lower end surface is formed on the lower end surface opposite to the upper end surface. A reinforcing groove whose width in the sliding direction of the magnetic recording medium gradually decreases from the upper end surface toward the upper end surface, and a winding groove is formed on at least one surface of the first and second magnetic core halves. The track width regulating groove and the reinforcing groove are formed of glass, and the one surface of the first magnetic core half is formed on both edges extending from the upper end surface side toward the lower end surface side. A first taper portion is provided, and the first magnetism A first inclined surface that intersects with the first taper portion is formed on the lower end surface side of the one surface of the half, and the one surface of the second magnetic core half has the upper surface Second tapered portions are provided on both edges extending from the end surface side toward the lower end surface side, and intersect with the second tapered portion on the lower end surface side of the one surface of the second magnetic core half. A second inclined surface is formed, the track width restricting groove is constituted by the first and second tapered portions, the reinforcing groove is constituted by the first and second inclined surfaces, and the track width restricting groove is formed. The most important feature is that the groove and the reinforcing groove communicate with each other, and the angle formed by the first and second inclined surfaces is set in a range of 94 ° or more.
[0014]
In the above configuration, the distance from the upper end of the reinforcing groove to the lower end of the winding groove is set to 0.9 mm or less.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
A magnetic head according to an embodiment of the present invention will be described below with reference to FIGS.
[0016]
As shown in FIGS. 1 to 3, the magnetic head includes first and second magnetic core halves 1 and 2 made of a ferromagnetic material such as MnZn single crystal ferrite. 1a, 2a of the magnetic core halves 1 and 2 of each of the magnetic core halves face each other, and a magnetic gap 4 and a track width regulating groove for regulating the track width Tw of the magnetic gap 4 are formed on the upper end surface 3 on which the magnetic recording medium slides. 5 is formed on the lower end surface 6 opposite to the upper end surface 3, and the width of the magnetic recording medium in the sliding direction (arrow A direction) gradually decreases from the lower end surface 6 toward the upper end surface 3. Are provided so that the track width regulating groove 5 and the reinforcing groove 7 are filled with glass 8 (in FIG. 2, the glass 8 is hatched).
[0017]
One surface 1a of the first magnetic core half 1 is provided with first taper portions 9 on both edges extending from the upper end surface 3 side toward the lower end surface 6 side, and this first taper is formed on the lower end surface 6 side. A first inclined surface 10 intersecting with the portion 9 is formed, and the winding groove 11 is formed so as to divide the first tapered portion 9.
[0018]
The one surface 2a of the second magnetic core half 2 is provided with second taper portions 12 on both edges extending from the upper end surface 3 side toward the lower end surface 6 side, and the second taper portion 12 is provided on the lower end surface 6 side. A second inclined surface 13 intersecting with the tapered portion 12 is formed, and the winding groove 14 is formed so as to divide the second tapered portion 12.
[0019]
The track width regulating groove 5 is constituted by the first and second tapered portions 9 and 12, and the reinforcing groove 7 is constituted by the first and second inclined surfaces 10 and 13, so that the first and second inclined surfaces are formed. An angle θ formed by the surfaces 10 and 13 passes through the magnetic gap 4 and extends straight from the upper end surface 3 side toward the lower end surface 6 side in parallel with the first surfaces 1a and 2a of the first and second magnetic core halves 1 and 2 ( The angle θ formed is set to 106 °, and the track width regulating groove 5 and the reinforcing groove 7 are in communication with each other.
[0020]
Next, a method of manufacturing the magnetic head constructed as described above will be described. First, as shown in FIGS. 4 and 5, first and second core blocks 15 made of a ferromagnetic material such as MnZn single crystal ferrite are used. , 16 are prepared. Next, as shown in FIG. 6, the winding groove 11 and the glass insertion groove 17 are formed on one surface of the first core block 15 along the longitudinal direction thereof, and as shown in FIG. A winding groove 14 and a glass insertion groove 18 are formed on one surface of the core block 16 along the longitudinal direction thereof.
[0021]
Next, as shown in FIG. 8, a plurality of protrusions 20 are formed by forming a plurality of cutout grooves 19 at regular intervals in the longitudinal direction along the short direction on one surface of the first core block 15. 9, and a plurality of cutout grooves 23 are formed on one surface of the second core block 16 along the short direction at regular intervals in the longitudinal direction, as shown in FIG. A plurality of protrusions 24, 25, and 26 are formed. Next, as shown in FIG. 10, the first taper portion 9 is formed on the protrusions 20, 21, and 22 of the first core block 15, and the inclined surface 27 is attached to the end of the protrusion 20, A first inclined surface 10 constituting the reinforcing groove 7 is formed at the end of the protrusion 21, and as shown in FIG. 11, the protrusions 24, 25, 26 of the second core block 16 have a second The tapered portion 12 is formed, an inclined surface 28 is attached to the end portion of the protruding portion 24, and the second inclined surface 13 constituting the reinforcing groove 7 is formed at the end portion of the protruding portion 25.
[0022]
Next, a magnetic film and a non-magnetic film are sequentially formed on one surface of the first and second core blocks 15 and 16 by a vacuum thin film forming technique such as sputtering. As shown in FIG. The first and second taper portions 9 and 12 constitute the track width regulating groove 5, and the first and second inclined surfaces 10 and 13 constitute the reinforcing groove 7. Let
[0023]
Next, as shown in FIGS. 13 and 14, one of the two glasses 8, 8 formed in a rod shape is placed at the abutting portion of the first and second core blocks 15, 16, and the other glass 8 Is placed in the glass insertion grooves 17 and 18 and brought into contact with the first and second inclined surfaces 10 and 13, and the both glasses 8 and 8 are heated and melted in this state, the first and second core blocks 15. , 16, one glass 8 disposed in the butted portion flows into the notch grooves 19, 23 and the track width regulating groove 5, and the other glass 8 disposed in the glass insertion grooves 17, 18 capillarizes from the reinforcing groove 7. Penetrating into the notch grooves 19 and 23 and the track width regulating groove 5 and filling both the glasses 8 and 8 into the notch grooves 19 and 23 and the track width regulating groove 5, whereby the first and second core blocks 15, 16 is integrated.
[0024]
Then, after cutting the first and second core blocks 15 and 16 into the state shown in FIG. 15, the first and second core blocks 15 and 16 are made to show a one-dot chain line DD and a one-dot chain line E. By cutting along the line E and winding a conductive coil (not shown) on the first and second magnetic core halves 1 and 2 obtained in this manner using the winding grooves 11 and 14, FIG. The manufacture of the magnetic head shown in FIG. 3 is completed.
[0025]
Therefore, in the magnetic head constructed and manufactured in this way, when the first and second core blocks 15 and 16 are integrated, as shown in FIG. 1, the angle θ formed by the second inclined surfaces 10 and 13 is set to 106 °, and therefore occurs between the other crow 8 disposed in the glass insertion grooves 17 and 18 and the upper end of the reinforcing groove 7. The clearance C becomes smaller than that of the prior art, and the other glass 8 heated and melted can quickly reach the upper end of the reinforcing groove 7, so that the other glass 8 is notched from the reinforcing groove 7 to the notched grooves 19 and 23. In addition, the glass unfilled portion 59 described above, which easily penetrates into the track width regulation groove 5 and spreads sufficiently and the notch grooves 19 and 23 and the track width regulation groove 5 are not filled with the other glass 8, is provided in the notch groove. 19, 23 and track width Suppressing the lower end of the winding grooves 11 and 14 in the regulation groove 5 is suppressed, and the length F of the glass unfilled portion 59 is set to the length between the lower ends of the winding grooves 11 and 14 and the upper end of the reinforcing groove 7. The height B can be made extremely small.
[0026]
In FIG. 16, the length B between the lower ends of the winding grooves 11 and 14 and the upper end of the reinforcing groove 7 is 0.83 mm, and the first and second inclined surfaces 10 and 13 constituting the reinforcing groove 7 are formed. It is a graph which shows the average value of length F of the glass unfilling part 59 measured by changing angle (theta). Thus, when the angle θ formed by the first and second inclined surfaces 10 and 13 is 90 °, the length F of the glass unfilled portion 59 is such that the lower ends of the winding grooves 11 and 14 and the upper ends of the reinforcing grooves 7 The length F of the glass unfilled portion 59 becomes smaller as the angle θ formed by the first and second inclined surfaces 10 and 13 is increased. I can see it going.
[0027]
The above-described crack 60 generated in the first and second core blocks 15 and 16 at the stage of cutting and cutting to form the first and second magnetic core halves 1 and 2 is the first and second magnetic core halves 1 and 2. 2 when the angle θ formed by the two inclined surfaces 10 and 13 is 94 ° or more, and almost no when the angle θ formed by the first and second inclined surfaces 10 and 13 is 100 ° or more. When the length F was 50 μm or less, the generation of cracks 60 was completely eliminated. From this result, the manufacturing yield can be improved by setting the angle θ formed by the first and second inclined surfaces 10 and 13 to 94 ° or more, and the angle θ formed by the first and second inclined surfaces 10 and 13 is further set to 100. It can be seen that the manufacturing yield can be significantly improved by setting the angle to more than °.
[0028]
In FIG. 17, the angle θ formed by the first and second inclined surfaces 10 and 13 constituting the reinforcing groove 7 is 106 °, and the gap between the lower ends of the winding grooves 11 and 14 and the upper end of the reinforcing groove 7 is set. It is a graph which shows the average value of the length F of the glass unfilled part 59 measured by changing length B. Accordingly, when the length B between the lower ends of the winding grooves 11 and 14 and the upper end of the reinforcing groove 7 is 1.00 mm, the length F of the glass unfilled portion 59 is 151.87 mm. It can be seen that the length F of the glass unfilled portion 59 becomes smaller as the length B between the lower ends of the winding grooves 11 and 14 and the upper end of the reinforcing groove 7 is reduced.
[0029]
When the length B between the lower end of the winding grooves 11 and 14 and the upper end of the reinforcing groove 7 is 0.9 mm or less, the length F of the glass unfilled portion 59 is 70 μm or less, and the first , The above-described cracks 60 are completely eliminated from the first and second core blocks 15 and 16 at the stage of cutting and cutting to form the second magnetic core halves 1 and 2. As a result, in addition to defining the angle range of the angle θ formed by the first and second inclined surfaces 9 and 12 constituting the reinforcing groove 5, the lower end of the winding grooves 11 and 14 and the upper end of the reinforcing groove 5 are defined. It can be seen that the production yield can be further improved by setting the length B between them to 0.9 mm or less.
[0030]
【The invention's effect】
The present invention is implemented in the form as described above, and has the following effects.
[0031]
A magnetic head according to the present invention includes first and second magnetic core halves made of a ferromagnetic material, and one surface of the first and second magnetic core halves are abutted to each other to form a magnetic recording medium. A magnetic gap and a track width regulating groove for regulating the track width of the magnetic gap are formed on the sliding upper end surface, and the lower end surface on the opposite side of the upper end surface is moved from the lower end surface toward the upper end surface. Reinforcing grooves in which the width in the sliding direction of the magnetic recording medium gradually decreases are provided, winding grooves are formed on at least one surface of the first and second magnetic core halves, and the track width regulating grooves And the reinforcing groove is filled with glass, and the one surface of the first magnetic core half is provided with a first taper portion on both edges extending from the upper end surface side toward the lower end surface side. The bottom of the one side of the first magnetic core half A first inclined surface intersecting with the first taper portion is formed on the surface side, and the one surface of the second magnetic core half is directed from the upper end surface side to the lower end surface side. A second taper portion is provided on both edges of the second magnetic core half, and a second inclined surface intersecting the second taper portion is formed on the lower end surface side of the one surface of the second magnetic core half. The track width regulating groove is constituted by the first and second tapered portions, the reinforcing groove is constituted by the first and second inclined surfaces, and the track width regulating groove and the reinforcing groove communicate with each other. Since the angle formed by the first and second inclined surfaces is set in the range of 94 ° or more, the length of the glass unfilled portion can be made as small as possible to improve the manufacturing yield.
[0032]
Further, since the distance from the upper end of the reinforcing groove to the lower end of the winding groove is set to 0.9 mm or less, the manufacturing yield can be further greatly improved.
[Brief description of the drawings]
FIG. 1 is a plan view of a magnetic head of the present invention.
FIG. 2 is a front view of the magnetic head of the present invention.
FIG. 3 is a bottom view of the magnetic head of the present invention.
FIG. 4 is a perspective view of a first core block to be a first magnetic core half provided in the magnetic head of the present invention.
FIG. 5 is a perspective view of a second core block to be a second magnetic core half of the magnetic head of the present invention.
FIG. 6 is a perspective view showing a state in which a winding groove and a glass insertion groove are formed in a first core block to be a first magnetic core half of the magnetic head of the present invention.
FIG. 7 is a perspective view showing a state in which a winding groove and a glass insertion groove are formed in a second core block to be a second magnetic core half of the magnetic head of the present invention.
FIG. 8 is a perspective view showing a state in which a plurality of protrusions are formed by forming a plurality of cutout grooves in a first core block to be a first magnetic core half of the magnetic head of the present invention.
FIG. 9 is a perspective view showing a state in which a plurality of protrusions are formed by forming a plurality of cutout grooves in a second core block to be a second magnetic core half of the magnetic head of the present invention.
FIG. 10 shows a state in which a first taper portion and a first inclined surface are formed on a plurality of protrusions formed on a first core block to be a first magnetic core half of the magnetic head of the present invention. FIG.
FIG. 11 shows a state in which a second taper portion and a second inclined surface are formed on a plurality of protrusions formed on a second core block to be a second magnetic core half of the magnetic head of the present invention. FIG.
FIG. 12 is a perspective view showing a state in which the first and second core blocks to be the first and second magnetic core halves provided in the magnetic head of the present invention are butted together.
FIG. 13 shows glass in each of the butted portions of the first and second core blocks and the first and second glass insertion grooves to be the first and second magnetic core halves of the magnetic head of the present invention. The perspective view which shows the state arrange | positioned.
FIG. 14 shows glass in each of the butted portions of the first and second core blocks and the first and second glass insertion grooves to be the first and second magnetic core halves of the magnetic head of the present invention. Sectional drawing which shows the state which has arrange | positioned.
FIG. 15 is a perspective view showing a state in which cutting is performed on the integrated first and second core blocks to be the first and second magnetic core halves included in the magnetic head of the present invention.
FIG. 16 is a graph showing the relationship between the angle formed by the first and second inclined surfaces constituting the reinforcing groove and the average length of the glass unfilled portion.
FIG. 17 is a graph showing a relationship between a length between a lower end of a winding groove and an upper end of a reinforcing groove and an average length of a glass unfilled portion.
FIG. 18 is a plan view of a conventional magnetic head.
FIG. 19 is a front view of a conventional magnetic head.
FIG. 20 is a bottom view of a conventional magnetic head.
FIG. 21 is a perspective view of a first core block to be a first magnetic core half of a conventional magnetic head.
FIG. 22 is a perspective view of a second core block to be a second magnetic core half of a conventional magnetic head.
FIG. 23 is a perspective view showing a state in which a winding groove and a glass insertion groove are formed in a first core block to be a first magnetic core half provided in a conventional magnetic head.
FIG. 24 is a perspective view showing a state in which a winding groove and a glass insertion groove are formed in a second core block to be a second magnetic core half of a conventional magnetic head.
FIG. 25 is a perspective view showing a state in which a plurality of protrusions are formed by forming a plurality of cutout grooves in a first core block to be a first magnetic core half provided in a conventional magnetic head.
FIG. 26 is a perspective view showing a state in which a plurality of protrusions are formed by forming a plurality of cutout grooves in a second core block to be a second magnetic core half of a conventional magnetic head.
FIG. 27 shows a state in which a first taper portion and a first inclined surface are formed on a plurality of protrusions formed on a first core block to be a first magnetic core half provided in a conventional magnetic head. FIG.
FIG. 28 shows a state in which a second taper portion and a second inclined surface are formed on a plurality of protrusions formed on a second core block to be a second magnetic core half of a conventional magnetic head. FIG.
FIG. 29 is a perspective view showing a state in which the first and second core blocks to be the first and second magnetic core halves provided in the conventional magnetic head are butted together.
FIG. 30 shows glass placed in the butted portions of the first and second core blocks to be the first and second magnetic core halves of the conventional magnetic head and in the first and second glass insertion grooves. The perspective view which shows the state which carried out.
FIG. 31 shows glass placed in the butted portions of the first and second core blocks to be the first and second magnetic core halves of the conventional magnetic head and in the first and second glass insertion grooves. Sectional drawing which shows the state which carried out.
FIG. 32 is a perspective view showing a state in which cutting is performed on the integrated first and second core blocks to be the first and second magnetic core halves provided in the conventional magnetic head.
FIG. 33 is a fragmentary cross-sectional view for explaining a problem of a conventional magnetic head.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st magnetic core half body 1a One surface 2 2nd magnetic core half body 2a One surface 3 Upper end surface 4 Magnetic gap 5 Track width control groove 6 Lower end surface 7 Reinforcing groove 8 Glass 9 1st taper part 10 1st inclination Surface 11 Winding groove 12 Second taper portion 13 Second inclined surface 14 Winding groove 15 First core block 16 Second core block 17 Glass insertion groove 18 Glass insertion groove 19 Notch groove 20 Projection 21 Projection 22 Projection 23 Notch groove 24 Projection 25 Projection 26 Projection 27 Inclined surface 28 Inclined surface

Claims

The first and second magnetic core halves made of a ferromagnetic material are provided, one surface of the first and second magnetic core halves are abutted with each other, and the upper end surface on which the magnetic recording medium slides, A magnetic gap and a track width regulating groove for regulating the track width of the magnetic gap are formed,
On the lower end surface opposite to the upper end surface, a reinforcing groove is provided in which the width in the sliding direction of the magnetic recording medium gradually decreases from the lower end surface toward the upper end surface.
A winding groove is formed on the one surface of at least one of the first and second magnetic core halves,
The track width regulating groove and the reinforcing groove are filled with glass,
The one surface of the first magnetic core half is provided with first tapered portions on both edges extending from the upper end surface side toward the lower end surface side on the one surface of the first magnetic core half body. A first inclined surface intersecting with the first tapered portion is formed on the lower end surface side of the
The one surface of the second magnetic core half is provided with second tapered portions at both edges extending from the upper end surface toward the lower end surface, and the one surface of the second magnetic core half A second inclined surface intersecting the second tapered portion is formed on the lower end surface side of
The track width regulating groove is constituted by the first and second tapered portions;
The reinforcing groove is constituted by the first and second inclined surfaces;
The track width regulating groove and the reinforcing groove communicate with each other;
The magnetic head is characterized in that an angle formed by the first and second inclined surfaces is set in a range of 94 ° or more.

2. The magnetic head according to claim 1, wherein a distance from an upper end of the reinforcing groove to a lower end of the winding groove is set to 0.9 mm or less.