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.

公开(公告)号：US5270894A

公开(公告)日：1993-12-14

申请号：US28171

申请日：1993-03-09

申请人： Horiyuki Okuda ,  Isao Tanaka ,  Jyoichi Tamada ,  Kazuo Ino ,  Takashi Ogura ,  Fumio Kameoka ,  Kouzo Ishihara

发明人： Horiyuki Okuda ,  Isao Tanaka ,  Jyoichi Tamada ,  Kazuo Ino ,  Takashi Ogura ,  Fumio Kameoka ,  Kouzo Ishihara

IPC分类号： G11B5/187 ,  G11B5/31 ,  G11B5/23

CPC分类号： G11B5/1874 ,  G11B5/1878

摘要： A parallel type MIG (Metal in Gap) magnetic head includes single-crystal ferrite core halves with a thin ferromagnetic film formed on the gap-forming face of at least one of the core halves. The core halves are joined together using a glass having an Fe content in the range of 2-13 at %. The crystalline geometry of the principal magnetic path forming faces and gap forming faces of the core halves is selected to minimize the pseudo-gap problem and to improve reproduction output.

摘要翻译： 平行式MIG（金属间隙）磁头包括形成在至少一个芯半部的间隙形成面上的薄铁磁膜的单晶铁氧体磁芯半部。 使用Fe含量在2-13at％范围内的玻璃将核心半部连接在一起。 选择主磁路形成面和芯半部的间隙形成面的结晶几何形状以最小化伪间隙问题并提高再现输出。

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。