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    Magnetic recording apparatus in a helical scan system
    1.
    发明授权
    Magnetic recording apparatus in a helical scan system 失效
    螺旋扫描系统中的磁记录装置

    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

    IPC分类号： G11B5/008 ,  G11B5/024 ,  G11B5/127 ,  G11B5/48 ,  G11B5/53 ,  G11B5/187 ,  G11B5/23

    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）。

    Magnetic head with improved efficiency in both high and low frequency ranges
    2.
    发明授权
    Magnetic head with improved efficiency in both high and low frequency ranges 失效
    磁头在高频和低频范围内提高了效率

    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。

    Process for producing magnetic head of the floating type
    4.
    发明授权
    Process for producing magnetic head of the floating type 失效
    浮动式磁头制造工艺

    公开(公告)号：US5225033A

    公开(公告)日：1993-07-06

    申请号：US793967

    申请日：1991-11-18

    申请人： Takashi Ogura ,  Takashi Yanai ,  Hiroyuki Okuda ,  Takao Yamano ,  Tsukasa Shimizu

    发明人： Takashi Ogura ,  Takashi Yanai ,  Hiroyuki Okuda ,  Takao Yamano ,  Tsukasa Shimizu

    IPC分类号： G11B5/187

    CPC分类号： G11B5/1871

    摘要： A process for producing a magnetic head of the floating type having a head portion and a slider portion comprises preparing a core block 7 having arranged on a plane a head forming portion and a slider forming portion for providing the head portion and the slider portion, respectively, and forming at least one pair of track width defining grooves 14, 14 across a gap spacer 4 by dry-etching a surface 8 of the core block 7 which is to be opposed to media to form a magnetic gap portion G by a portion of the gap spacer of a predetermined track width between the pair of grooves.

    摘要翻译： 一种具有头部和滑块部分的浮动式磁头的制造方法，包括：准备具有头部形成部的平面上的芯块7和分别设置头部和滑块部的滑块形成部 并且通过干式蚀刻芯块7的与介质相对的表面8来形成至少一对轨道宽度限定槽14,14跨越间隙隔离物4，以形成磁隙部分G，以形成磁隙部分G 在一对槽之间的预定轨道宽度的间隙垫片。