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公开(公告)号：US5099376A
公开(公告)日：1992-03-24
申请号：US650814
申请日：1991-01-31
申请人： Kazuo Ino , Yoshiaki Shimizu , Hiroyuki Okuda , Kousou Ishihara , Takashi Ogura
发明人： Kazuo Ino , Yoshiaki Shimizu , Hiroyuki Okuda , Kousou Ishihara , Takashi Ogura
CPC分类号： G11B5/127 , G11B5/1871 , Y10T29/49046 , Y10T29/49057 , Y10T29/49067
摘要： A magnetic head comprises a pair of magnetic core halves (1a, 1b), which are abutted with each other through a nonmagnetic material to define a magnetic gap (2), and ferromagnetic thin films (3a, 3b). The magnetic core halves (1a, 1b), which are formed of ferromagnetic oxide, have gap forming surfaces to be abutted with each other. The ferromagnetic metal thin films (3a, 3b) are selectively formed on the gap forming surfaces of the pair of magnetic core halves (1a, 1b). A ferromagnetic thin film (3b) is so formed that portion (12b, 12c, 12d) to be provided with a track width regulating groove (13b), a coil groove (13c) or a joining member receiving groove (13d) is exposed within a gap forming surface of one magnetic core half member (7b). Another ferromagnetic thin film (3a) is so formed that, in a gap forming surface of another magnetic core half member (7a), a portion (12e, 12f) opposite to the coil groove (13c) or the joining member receiving groove (13d) to be provided in the gap forming surface of the magnetic core half member (7b) is exposed. These ferromagnetic thin films (3a, 3b) are selectively formed by ion beam etching. Grooves (13b, 13c, 13d) are provided in one magnetic core half (1b) by mechanical working through a dicing saw or the like.
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公开(公告)号：US4953049A
公开(公告)日：1990-08-28
申请号：US218018
申请日：1988-07-12
申请人： Hiroyuki Okuda , Yoshiaki Shimizu , Kazuo Ino , Kousou Ishihara , Takashi Ogura
发明人： Hiroyuki Okuda , Yoshiaki Shimizu , Kazuo Ino , Kousou Ishihara , Takashi Ogura
CPC分类号： G11B5/1874 , G11B5/1878
摘要： A magnetic head comprises a pair of magnetic core halves, heat-resistant thin films and ferromagnetic thin films, the pair of magnetic core halves being opposed to each other through a non-magnetic material such as SiO.sub.2 to form a magnetic gap. The magnetic core halves are made of a ferromagnetic oxide such as ferrite and have gap forming faces to be opposed to each other to form the magnetic gap. The gap forming faces are etched by phosphoric acid solution and then purified by reverse sputtering, so that a grown crystal of the ferromagnetic oxide is exposed on the gap forming faces. A heat-resistant thin film of a heat-resistant material such as SiO.sub.2 is formed on each of the gap forming faces. A ferromagnetic thin film of a ferromagnetic metal material such as sendust is formed on each heat-resistant thin film. Preferably, the thickness of the heat-resistant thin film to be formed is 1 nm or more and one tenth or less of the width of the magnetic gap. For example, SiO.sub.2 films of 5 nm in thickness as the heat-resistant thin films are formed on the respective gap forming faces and sendust films of 3 .mu.m in thickness as the ferromagnetic metal thin films are formed on the respective SiO.sub.2 films. In this case, the gap length of the magnetic gap is set to 0.2 .mu.m.
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公开(公告)号：US5278716A
公开(公告)日：1994-01-11
申请号：US974757
申请日：1992-11-12
申请人： Hiroyuki Okuda , Yoshiaki Shimizu , Kazuo Ino , Kousou Ishihara , Takashi Ogura
发明人： Hiroyuki Okuda , Yoshiaki Shimizu , Kazuo Ino , Kousou Ishihara , Takashi Ogura
摘要： A magnetic head comprises a pair of magnetic core halves, heat-resistant thin films and ferromagnetic thin films, the pair of magnetic core halves being opposed to each other through a non-magnetic material such as SiO.sub.2 to form a magnetic gap. The magnetic core halves are made of a ferromagnetic oxide such as ferrite and have gap forming faces to be opposed to each other to form the magnetic gap. The gap forming faces are etched by phosphoric acid solution and then purified by reverse sputtering, so that a grown crystal of the ferromagnetic oxide is exposed on the gap forming faces. A heat-resistant thin film of a heat-resistant material such as SiO.sub.2 is formed on each of the gap forming faces. A ferromagnetic thin film of a ferromagnetic metal material such as sendust is formed on each heat-resistant thin film. Preferably, the thickness of the heat-resistant thin film to be formed is 1 nm or more and one tenth or less of the width of the magnetic gap. For example, SiO.sub.2 films of 5 nm in thickness as the heat-resistant thin films are formed on the respective gap forming faces and sendust films of 3 .mu.m in thickness as the ferromagnetic metal thin films are formed on the respective SiO.sub.2 films. In this case, the gap length of the magnetic gap is set to 0.2 .mu.m.
摘要翻译： 磁头包括一对磁芯半部，耐热薄膜和铁磁性薄膜，一对磁芯半部通过非磁性材料如SiO 2彼此相对以形成磁隙。 磁芯半部由诸如铁氧体的铁磁性氧化物制成，并且具有彼此相对的间隙形成面以形成磁隙。 通过磷酸溶液蚀刻间隙形成面，然后通过反溅射进行纯化，使得在间隙形成面上暴露铁磁性氧化物的生长晶体。 在每个间隙形成面上形成耐热材料如SiO 2的耐热薄膜。 在每个耐热薄膜上形成铁硬金属材料如铁硅铝铁合金的铁磁薄膜。 优选地，要形成的耐热薄膜的厚度为磁隙宽度的1nm以上且十分之一以下。 例如，由于在各SiO 2膜上形成强磁性金属薄膜，所以在3（μm）m的间隙形成面和厚度为3μm的厚度的薄膜上，形成5nm厚的SiO 2膜。 在这种情况下，磁隙的间隙长度设定为0.2（my）m。
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公开(公告)号：US5195004A
公开(公告)日：1993-03-16
申请号：US826192
申请日：1992-01-21
申请人： Hiroyuki Okuda , Yoshiaki Shimizu , Kazuo Ino , Kousou Ishihara , Takashi Ogura
发明人： Hiroyuki Okuda , Yoshiaki Shimizu , Kazuo Ino , Kousou Ishihara , Takashi Ogura
IPC分类号： G11B5/187
CPC分类号： G11B5/1874 , G11B5/1878 , Y10T29/49043 , Y10T29/49052 , Y10T29/49067
摘要： A magnetic head comprises a pair of magnetic core halves, heat-resistant thin films and ferromagnetic thin films, the pair of magnetic core halves being opposed to each other through a non-magnetic material such as SiO.sub.2 to form a magnetic gap. The magnetic core halves are made of a ferromagnetic oxide such as ferrite and have gap forming faces to be opposed to each other to form the magnetic gap. The gap forming faces are etched by phosphoric acid solution and then purified by reverse sputtering, so that a grown crystal of the ferromagnetic oxide is exposed on the gap forming faces. A heat-resistant thin film of a heat-resistant material such as SiO.sub.2 is formed on each of the gap forming faces. A ferromagnetic thin film of a ferromagnetic metal material such as sendust is formed on each heat-resistant thin film. Preferably, the thickness of the heat-resistant thin film to be formed is 1 nm or more and one tenth or less of the width of the magnetic gap. For example, SiO.sub.2 films of 5 nm in thickness as the heat-resistant thin films are formed on the respective gap forming faces and sendust films of 3 .mu.m in thickness as the ferromagnetic metal thin films are formed on the respective SiO.sub.2 films. In this case, the gap length of the magnetic gap is set to 0.2 .mu.m.
摘要翻译： 磁头包括一对磁芯半部，耐热薄膜和铁磁性薄膜，一对磁芯半部通过非磁性材料如SiO 2彼此相对以形成磁隙。 磁芯半部由诸如铁氧体的铁磁性氧化物制成，并且具有彼此相对的间隙形成面以形成磁隙。 通过磷酸溶液蚀刻间隙形成面，然后通过反溅射进行纯化，使得在间隙形成面上暴露铁磁性氧化物的生长晶体。 在每个间隙形成面上形成耐热材料如SiO 2的耐热薄膜。 在每个耐热薄膜上形成铁硬金属材料如铁硅铝铁合金的铁磁薄膜。 优选地，要形成的耐热薄膜的厚度为磁隙宽度的1nm以上且十分之一以下。 例如，在相应的SiO 2膜上形成强磁性金属薄膜的情况下，在厚度为3μm的各个间隙形成面和厚度厚度的薄膜上形成5nm厚的作为耐热薄膜的SiO 2膜。 在这种情况下，磁隙的间隙长度设定为0.2μm。
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公开(公告)号：US5007158A
公开(公告)日：1991-04-16
申请号：US307654
申请日：1989-02-08
申请人： Kazuo Ino , Yoshiaki Shimizu , Hiroyuki Okuda , Kousou Ishihara , Takashi Ogura
发明人： Kazuo Ino , Yoshiaki Shimizu , Hiroyuki Okuda , Kousou Ishihara , Takashi Ogura
CPC分类号： G11B5/127 , G11B5/1871 , Y10T29/49046 , Y10T29/49057 , Y10T29/49067
摘要： A magnetic head comprises a pair of magnetic core halves (1a, 1b), which are abutted with each other through a nonmagnetic material to define a magnetic gap (2), and ferromagnetic thin films (3a, 3b). The magnetic core halves (1a, 1b), which are formed of ferromagnetic oxide, have gap forming surfaces to be abutted with each other. The ferromagnetic metal thin films (3a, 3b) are selectively formed on the gap forming surfaces of the pair of magnetic core halves (1a, 1b). A ferromagnetic thin film (3b) is so formed that portion (12b, 12c, 12d) to be provided with a track width regulating groove (13b), a coil groove (13c) or a joining member receiving groove (13d) is exposed within a gap forming surface of one magnetic core half member (7b). Another ferromagnetic thin film (3a) is so formed that, in a gap forming surface of another magnetic core half member (7a), a portion (12e, 12f) opposite to the coil groove (13c) or the joining member receiving groove (13d) to be provided in the gap forming surface of the magnetic core half member (7b) is exposed. These ferromagnetic thin films (3a, 3b) are selectively formed by ion means beam etching. Grooves (13b, 13c, 13d) are provided in one magnetic core half (1b) by mechanical working through a dicing saw or the like.
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6.发明授权
公开(公告)号：US5155645A
公开(公告)日：1992-10-13
申请号：US611574
申请日：1990-11-13
申请人： Tsukasa Shimizu , Yoshiaki Shimizu , Jyoichi Tamada , Hiroyuki Okuda , Takao Yamano , Kazuo Ino , Koso Ishihara , Takashi Ogura
发明人： Tsukasa Shimizu , Yoshiaki Shimizu , Jyoichi Tamada , Hiroyuki Okuda , Takao Yamano , Kazuo Ino , Koso Ishihara , Takashi Ogura
IPC分类号： G11B5/187
CPC分类号： G11B5/1877
摘要： A magnetic head has a pair of magnetic core halves opposed to each other with a non-magnetic material posed therebetween to form a magnetic gap, which head includes a pair of magnetic core halves, a first ferromagnetic metal thin film and a second ferromagnetic metal thin film. The magnetic core halves are formed of ferromagnetic oxide such as Mn-Zn ferrite, and they have opposing surfaces opposed to each other to provide the magnetic gap. The first ferromagnetic metal thin film formed of Fe-Si-Al alloy is formed at least on one of the opposing surfaces. The second ferromagnetic metal thin film formed of Fe-Si-Al alloy having different constituent ratio from the first ferromagnetic metal thin film is formed between the magnetic gap and the first ferromagnetic metal thin film. The flux density of the second ferromagnetic metal thin film induced when a magnetic field of 1.2K oersted is applied exceeds 1000 gauss. The ratio of the saturation flux density of the second ferromagnetic metal thin film to that of the first ferromagnetic metal thin film is not higher than 0.6. The self recording reproducing capability of the magnetic head is not degraded in the high frequency region, and the self recording reproducing capability in the low frequency region is increased.
摘要翻译： 磁头具有彼此相对的一对磁芯半部，其间具有非磁性材料，以形成磁隙，该磁头包括一对磁芯半部，第一铁磁金属薄膜和第二铁磁金属薄片 电影。 磁芯半部由诸如Mn-Zn铁氧体的铁磁性氧化物形成，并且它们具有彼此相对的相对表面以提供磁隙。 由Fe-Si-Al合金形成的第一铁磁金属薄膜至少在相对的表面之一上形成。 在磁隙和第一铁磁金属薄膜之间形成由与第一强磁性金属薄膜构成比不同的Fe-Si-Al合金形成的第二强磁性金属薄膜。 当施加1.2K奥斯特的磁场时引起的第二铁磁性金属薄膜的磁通密度超过1000高斯。 第二强磁性金属薄膜的饱和磁通密度与第一强磁性金属薄膜的饱和磁通密度的比率不高于0.6。 在高频区域中，磁头的自记录再现能力不会降低，并且低频区域中的自动记录再现能力增加。
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公开(公告)号：US5218500A
公开(公告)日：1993-06-08
申请号：US813751
申请日：1991-12-31
申请人： Hiroyuki Okuda , Isao Tanaka , Jyoichi Tamada , Kazuo Ino , Takashi Ogura , Fumio Kameoka , Kouzo Ishihara
发明人： Hiroyuki Okuda , Isao Tanaka , Jyoichi Tamada , Kazuo Ino , Takashi Ogura , Fumio Kameoka , Kouzo Ishihara
IPC分类号： G11B5/187
CPC分类号： G11B5/1878 , G11B5/1874
摘要： With a view to solving the problem of "pseudo-gap" in a parallel type MIG head and to improving its reproduction output, effective combinations of the principal magnetic path forming face and the gap-forming face were determined empirically for the case of using a single-crystal ferrite core material. The improved magnetic head comprises a pair of magnetic core halves made of a single-crystal ferrite, at least one of said magnetic core halves having a thin ferromagnetic metal film formed on the gap-forming face, and said thin ferromagnetic metal film abutting against the other magnetic core half with a non-magnetic material being interposed to form a magnetic gap, the improvement wherein the principal magnetic path forming face of the magnetic core half provided with said thin ferromagnetic metal film has a crystal plane generally designated {211} whereas a vector A that is parallel to the crystal axis in said principal magnetic path forming face and that is directed away from the gap-forming face forms an angle .theta. of the range 0.degree.-60.degree. or 150.degree.-180.degree. with a vector B that is parallel to the intersection of the principal magnetic path forming face and the gap-forming face and that approaches the face opposite to a recording medium.
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公开(公告)号：US4772967A
公开(公告)日：1988-09-20
申请号：US927487
申请日：1986-11-06
申请人： Hiroyuki Okuda , Masaru Doi , Yoshiaki Shimizu , Takao Yamano , Kazuo Ino , Koso Ishihara
发明人： Hiroyuki Okuda , Masaru Doi , Yoshiaki Shimizu , Takao Yamano , Kazuo Ino , Koso Ishihara
CPC分类号： G11B5/4893 , G11B5/0086 , G11B5/024 , G11B5/127 , G11B5/53
摘要： A magnetic recording apparatus of a helical scanning system comprises a rotary cylinder (13), recording heads (A and B) and an erase head (10) attached to slightly project from a rotating surface (13a) of the cylinder (13). The rotary erase head (10) has a gap (4) comprising a ferrite core half (1) and a Sendust film (3) formed on a ferrite core half (2) opposed to the ferrite core half (1) and having a larger saturation magnetic flux density. In addition, the recording heads (A and B) and the rotary erase head (10) are attached on the rotary cylinder (13) so that an end (P1) located forward with respect to the tape travelling direction (11) of the Sendust film (3) may trace the backward side with respect to the tape travelling direction (11), apart by a distance which is a half of the gap length of the rotary erase head (10), as compared with a forward end (Q) of a recorded track pattern ( 15a) formed on a tape (14) by the recording head (A) scanning immediately after erasing by the rotary erase head (10).
摘要翻译： 螺旋扫描系统的磁记录装置包括旋转圆筒（13），记录头（A和B）以及从气缸（13）的旋转表面（13a）稍微伸出的擦除头（10）。 旋转擦除头（10）具有包括铁氧体磁芯半部（1）的间隙（4）和与铁氧体磁芯半体（1）相对的铁氧体磁心半部（2）上形成的具有较大的铁氧体磁芯半部 饱和磁通密度。 此外，记录头（A和B）和旋转擦除头（10）安装在旋转圆筒（13）上，使得相对于塞浦路斯的磁带行进方向（11）位于前方的端部（P1） 与前端（Q）相比，膜（3）可以相对于磁带行进方向（11）相对于旋转擦除头（10）的间隙长度的一半的距离来追踪向后侧， 通过由旋转擦除头（10）擦除之后立即扫描的记录头（A）形成在带（14）上的记录轨迹图案（15a）。
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公开(公告)号：US6012218A
公开(公告)日：2000-01-11
申请号：US42631
申请日：1998-03-17
申请人： Yoshiaki Shimizu , Fumio Tatezono , Naoto Matono , Takashi Ogura , Hiroyuki Okuda , Katsumi Umeda
发明人： Yoshiaki Shimizu , Fumio Tatezono , Naoto Matono , Takashi Ogura , Hiroyuki Okuda , Katsumi Umeda
CPC分类号： G11B5/3967 , G11B5/3116 , G11B5/3163 , Y10T29/49044 , Y10T29/49046
摘要： The invention provides a thin film magnetic head including an upper core layer 9 which comprises a front first core layer 91a formed on a gap spacer layer 6 and having the same width as a track width on the recording medium at least in the vicinity of the face to be opposed to a recording medium, and a second core layer 92 extending from the medium-opposed face over the upper surface of the front first core layer 91a and further over the upper surface of an upper insulating layer 72. The upper core layer 9 has a thickness greater in a region extending from the medium-opposed face to a depth end restricting face DE of a lower insulating layer 71 than in a region extending over the upper surface of the upper insulating layer 72. The front first core layer 91a has an upper surface flush with the upper surface of the lower insulating layer 71. This structure gives an accurate track width and assures production with a high yield.
摘要翻译： 本发明提供了一种薄膜磁头，其包括上芯层9，其包括形成在间隙隔离层6上的前第一芯层91a，并且至少在表面附近具有与记录介质上的磁道宽度相同的宽度 与记录介质相对，第二芯层92从前第一芯层91a的上表面延伸并且在上绝缘层72的上表面上方从介质相对面延伸。上芯层9 在从中间相对面延伸到下绝缘层71的深度限制面DE的区域中的厚度大于在上绝缘层72的上表面延伸的区域中的厚度。前第一芯层91a具有 上表面与下绝缘层71的上表面齐平。这种结构提供了准确的轨道宽度并以高产量确保生产。
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公开(公告)号：US5768072A
公开(公告)日：1998-06-16
申请号：US663841
申请日：1996-06-14
申请人： Yutaka Ueta , Hiroyuki Ohno , Takao Yamano , Kiyotaka Itou , Kousou Ishihara , Kazuhiro Koga , Yoshifumi Fukumoto , Atsushi Furuzawa , Takahiro Ogawa , Hiroyuki Okuda , Toshinori Urano
发明人： Yutaka Ueta , Hiroyuki Ohno , Takao Yamano , Kiyotaka Itou , Kousou Ishihara , Kazuhiro Koga , Yoshifumi Fukumoto , Atsushi Furuzawa , Takahiro Ogawa , Hiroyuki Okuda , Toshinori Urano
CPC分类号： G11B5/1276 , G11B5/1878 , G11B5/232
摘要： A magnetic head comprises a first abutting segment formed with a winding groove having an open side, and a second abutting segment opposed to the open side of the groove and joined to the first segment. The first abutting segment comprises a first core segment having the groove, and gap spacers and second ferromagnetic thin films formed on the surface thereof opposed to the second segment and positioned above and below the groove. The first core segment comprises a core segment member made of a ferromagnetic material, formed with the groove and having a first ferromagnetic thin film which is formed on the surface thereof opposed to the second abutting segment and which is positioned toward the face of the head to be opposed to recording media. The second abutting segment has a face to be opposed to the recording medium and formed by a nonmagnetic material.
摘要翻译： 磁头包括形成有具有开口侧的卷绕槽的第一邻接部分和与凹槽的敞开侧相对并连接到第一部分的第二邻接部分。 第一邻接部分包括具有凹槽的第一芯部段和形成在其与第二部分相对并且位于沟槽上方和下方的表面上的间隔间隔物和第二铁磁性薄膜。 第一芯部段包括由铁磁材料制成的芯部分部件，其形成有沟槽并且具有第一铁磁性薄膜，该第一铁磁性薄膜形成在与第二抵接部分相对的表面上并且朝向头部的表面定位 反对记录媒体。 第二邻接部分具有与记录介质相对并由非磁性材料形成的面。
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