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公开(公告)号：EP0271098A3
公开(公告)日：1990-05-16
申请号：EP87118313.3
申请日：1987-12-10
发明人： Koizumi, Noboru , Yamazaki, Kazuya
IPC分类号： G11B5/325
CPC分类号： G11B5/325 , G11B5/00821 , G11B5/024
摘要： A permanent magnet type demagnetizing head has a first magnetic part disposed on a front part (21a₁) of a tape running surface of a magnetic material, a second magnetic part(21c) disposed on a rear part of the tape running surface and a non-magnetic part or a feeble magnetic part(21b) disposed between the first and the second magnetic parts in the tape running direction; and the first magnetic part is magnetized in a magnetic pattern having plural magnetized regions of one or more N-pole and S-pole; the second magnetic part is magnetized in a magnetic pattern of alternating stripes of N-pole regions and S-pole regions, the boundaries between neighboring N-pole regions and S-pole regions are inclined, and the intensity of magnetization of each regions are made to be gradually reduced.
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公开(公告)号：EP0328459A1
公开(公告)日：1989-08-16
申请号：EP89400379.7
申请日：1989-02-09
申请人： EUROFARAD EFD
发明人： Benain, Ezer , Lelièvre, Jean-Yves
摘要： La présente invention concerne une tête magnétique qui comprend un aimant permanent (10) et deux éléments de blindage (20a, 20b) en matériau magnétique placés en regard et à distance des faces polaires (11, 12) de l'aimant, afin de définir deux entrefers actifs.
摘要翻译： 磁头，其包括永磁体（10）和由磁性材料制成并彼此相对且离开磁体的极面（11,12）一定距离的两个屏蔽元件（20a，20b），以限定 两个活跃的气垫。
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公开(公告)号：EP0081855B1
公开(公告)日：1989-08-09
申请号：EP82111647.2
申请日：1982-12-15
IPC分类号： G11B5/127
CPC分类号： G11B5/325 , G11B5/00826 , G11B5/024
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4.发明公开Data erasure apparatus, data erasure method and method for writing servo patterns on recording disk 审中-公开数据记录盘上擦除装置，数据删除方法，和方法，用于记录伺服模式
公开(公告)号：EP1592007A3
公开(公告)日：2006-11-08
申请号：EP05003926.2
申请日：2005-02-23
发明人： Kitamura, Mitsuru , Katoh, Masahiko , Tamura, Hitoshi , Uchiyama, Hiroaki , Murayama, Masashi , Ikeda, Migifumi , Sasaki, Kazuo , Watanabe, Shigeki
CPC分类号： G11B19/20 , G11B5/0245 , G11B5/325 , G11B5/59633
摘要： To prevent a spindle motor from stopping rotation while data on a magnetic disk is being erased by using a permanent magnet 151. Data in the whole area of the magnetic disk 113 is erased as a consequence of the magnetic disk 113 rotating in the magnetic field of the permanent magnet 151 located so as to face a part of the magnetic disk 113. A back yoke 161 is located so as to face a base 111. The back yoke 161 gives a magnetic force to the spindle motor in the opposite direction of the magnetic force of the erasing permanent magnet 151 so that the fluid dynamic bearing spindle motor can retain the rotation as required without stopping rotation.
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5.发明公开Data erasure apparatus, data erasure method and method for writing servo patterns on recording disk 审中-公开数据记录盘上擦除装置，数据删除方法，和方法，用于记录伺服模式
公开(公告)号：EP1592007A2
公开(公告)日：2005-11-02
申请号：EP05003926.2
申请日：2005-02-23
发明人： Kitamura, Mitsuru , Katoh, Masahiko , Tamura, Hitoshi , Uchiyama, Hiroaki , Murayama, Masashi , Ikeda, Migifumi , Sasaki, Kazuo , Watanabe, Shigeki
CPC分类号： G11B19/20 , G11B5/0245 , G11B5/325 , G11B5/59633
摘要： To prevent a spindle motor from stopping rotation while data on a magnetic disk is being erased by using a permanent magnet 151. Data in the whole area of the magnetic disk 113 is erased as a consequence of the magnetic disk 113 rotating in the magnetic field of the permanent magnet 151 located so as to face a part of the magnetic disk 113. A back yoke 161 is located so as to face a base 111. The back yoke 161 gives a magnetic force to the spindle motor in the opposite direction of the magnetic force of the erasing permanent magnet 151 so that the fluid dynamic bearing spindle motor can retain the rotation as required without stopping rotation.
摘要翻译： 为了防止主轴马达从而磁盘上的数据是通过使用一个永久磁铁在磁盘113的整个区域151的数据被擦除的磁盘113的磁场旋转的结果擦除旋转停止 永久磁铁151定位成面向磁盘113的背磁轭161被定位成面对基座的一部分111的背轭铁161给出了磁性相反的方向的磁力向主轴电机 擦除永久磁铁151的力，从而没有根据需要在不停止旋转的流体动力轴承主轴电动机可以保持旋转。
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公开(公告)号：EP0744736A3
公开(公告)日：1997-07-02
申请号：EP96106357.5
申请日：1996-04-23
CPC分类号： G11B5/54 , G11B5/024 , G11B5/325 , G11B15/125
摘要： An erase head assembly for high speed and density, precision magnetic tape data storage systems movable into and out of an erase/record position without affecting the tape transport path. A cylindrical drum having an axis of rotation and a peripheral, tape bearing, curved surface of a width sufficient to bear against and make intimate contact across the width of the magnetic tape is provided in the tape transport path. The permanent magnet erase head is mounted within the drum adjacent a first portion of the peripheral curved surface, the magnetic erase head providing a permanent magnetic erase field extending outside the first portion of the peripheral surface and across the width thereof. The drum is rotated between a first rotational position, wherein the permanent magnet erase head is positioned in the tape transport path to effect erasure of the magnetic tape, and a second rotational position, wherein the permanent magnet erase head is rotated out of the tape transport path and distanced therefrom sufficiently to prevent erasure of the magnetic tape to allow magnetic tape transport without erasure. The permanent magnet erase head assembly is preferably formed of an array of an odd number of alternatingly polarized permanent magnets of substantially equal thickness having terminators sandwiching the array therebetween for suppressing respective portions of the fields associated with the adjacent leading and trailing permanent magnets in the array.
摘要翻译： 一种用于高速和密度的擦除头组件，可以进入和移出擦除/记录位置而不影响磁带传送路径的精密磁带数据存储系统。 具有旋转轴的圆柱形滚筒和周边带状轴承，宽度足以承受横跨磁带宽度的紧密接触的弯曲表面设置在带传送路径中。 永久磁铁擦除头安装在与圆周曲面的第一部分相邻的滚筒内，磁性擦除头提供延伸到外围表面的第一部分外部并跨越其宽度的永久磁性擦除磁场。 鼓在第一旋转位置之间旋转，其中永磁体擦除头位于带传送路径中以实现磁带的擦除，以及第二旋转位置，其中永磁体擦除头旋转离开带传送 路径并远离其，以防止磁带的擦除，从而允许磁带传输而不被擦除。 永磁体擦除头组件优选地由具有基本相同厚度的奇数交替极化永磁体的阵列形成，具有将阵列夹在其间的端子，用于抑制与阵列中相邻的前和后永磁体相关联的磁场的各个部分 。
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公开(公告)号：EP0744736A2
公开(公告)日：1996-11-27
申请号：EP96106357.5
申请日：1996-04-23
CPC分类号： G11B5/54 , G11B5/024 , G11B5/325 , G11B15/125
摘要： An erase head assembly for high speed and density, precision magnetic tape data storage systems movable into and out of an erase/record position without affecting the tape transport path. A cylindrical drum having an axis of rotation and a peripheral, tape bearing, curved surface of a width sufficient to bear against and make intimate contact across the width of the magnetic tape is provided in the tape transport path. The permanent magnet erase head is mounted within the drum adjacent a first portion of the peripheral curved surface, the magnetic erase head providing a permanent magnetic erase field extending outside the first portion of the peripheral surface and across the width thereof. The drum is rotated between a first rotational position, wherein the permanent magnet erase head is positioned in the tape transport path to effect erasure of the magnetic tape, and a second rotational position, wherein the permanent magnet erase head is rotated out of the tape transport path and distanced therefrom sufficiently to prevent erasure of the magnetic tape to allow magnetic tape transport without erasure. The permanent magnet erase head assembly is preferably formed of an array of an odd number of alternatingly polarized permanent magnets of substantially equal thickness having terminators sandwiching the array therebetween for suppressing respective portions of the fields associated with the adjacent leading and trailing permanent magnets in the array.
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9.发明公开Permanent magnet type demagnetizing head 失效永久磁铁（Entmagnetisierungskopf der Art mit Permanentmagnet）
公开(公告)号：EP0271098A2
公开(公告)日：1988-06-15
申请号：EP87118313.3
申请日：1987-12-10
发明人： Koizumi, Noboru , Yamazaki, Kazuya
IPC分类号： G11B5/325
CPC分类号： G11B5/325 , G11B5/00821 , G11B5/024
摘要： A permanent magnet type demagnetizing head has a first magnetic part disposed on a front part (21a₁) of a tape running surface of a magnetic material, a second magnetic part(21c) disposed on a rear part of the tape running surface and a non-magnetic part or a feeble magnetic part(21b) disposed between the first and the second magnetic parts in the tape running direction; and the first magnetic part is magnetized in a magnetic pattern having plural magnetized regions of one or more N-pole and S-pole; the second magnetic part is magnetized in a magnetic pattern of alternating stripes of N-pole regions and S-pole regions, the boundaries between neighboring N-pole regions and S-pole regions are inclined, and the intensity of magnetization of each regions are made to be gradually reduced.
摘要翻译： 永久磁铁式退磁头具有设置在磁性材料的带运行表面的前部（21a1）上的第一磁性部分，和设置在磁带运行表面的后部的第二磁性部分（21c） 磁性部分或在磁带运行方向上设置在第一和第二磁性部分之间的微弱磁性部分（21b） 并且第一磁性部件以具有一个或多个N极和S极的多个磁化区域的磁性图案磁化; 第二磁性部件以N极区域和S极区域的交替条纹的磁性图案被磁化，相邻N极区域和S极区域之间的边界倾斜，并且每个区域的磁化强度被制成 逐渐减少。
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公开(公告)号：EP0081855A3
公开(公告)日：1985-11-06
申请号：EP82111647
申请日：1982-12-15
IPC分类号： G11B05/12
CPC分类号： G11B5/325 , G11B5/00826 , G11B5/024
摘要： A permanent magnet type erasing head for generating a gradually decreasing alternating magnetic field in which a plurality of magnetic poles (43-45, 110, 111) are provided along a magnetic recording medium. The first magnetic pole (43, 110) generates a magnetic field of an intensity strong enough to saturate the magnetic recording medium while each of the second and succeeding magnetic poles (44, 111) except the last magnetic pole (45) have a magnetic field with an opposite polarity to that of a preceding magnetic pole and a weaker intensity than that of the preceding magnetic pole.
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