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    • 3. 发明授权
    • Computer readable medium having a program using particle method
    • 具有使用粒子法的程序的计算机可读介质
    • US07672821B2
    • 2010-03-02
    • US12218637
    • 2008-07-18
    • Akio HoriHiromi Kojo
    • Akio HoriHiromi Kojo
    • G06G7/48
    • G06F17/5009G06F2217/16
    • Finite element methods are unsuitable for a dispersed system. Particle methods suitable for a dispersed system are limited in their particle shapes of only spheres that require many particles to model a complicated shape especially in 3D. Proposed procedures for a particle method are roughly as follows. 1): Judging the existence of the contact between particles as that between mathematically-smooth closed surfaces representing particle shape and size. 2): Assuming an imaginary contact point and an imaginary contact plane the same as when both closed surfaces are reduced with the same scale to touch at one point. 3): Calculating imaginary contact area and imaginary contact stiffness using the above point and plane. Based on these procedures, particle shapes are not limited but smooth. Therefore, a more complicated shaped problem in a dispersed system can be analyzed with a smaller number of particles. Additionally, combined use with finite elements enlarges usability.
    • 有限元方法不适用于分散系统。 适用于分散系统的粒子方法仅限于需要许多粒子以特别是3D模拟复杂形状的球体的粒子形状。 粒子方法的拟议程序大致如下。 1):判断颗粒之间的接触存在于表示颗粒形状和尺寸的数学平滑闭合表面之间。 2):假设虚拟接触点和虚拟接触平面与当两个闭合表面都以相同的刻度在一点上相互缩小时相同。 3):使用上述点和平面计算假想接触面积和假想接触刚度。 基于这些程序,粒子形状并不局限于光滑。 因此,可以用较少数量的颗粒分析分散系统中更复杂的成型问题。 另外,结合使用有限元可以扩大可用性。
    • 4. 发明授权
    • Thin-film magnetic head having a portion of the upper magnetic core
coplanar with a portion of the lower magnetic core
    • 薄膜磁头具有与下部磁芯的一部分共面的上部磁芯的一部分
    • US5872693A
    • 1999-02-16
    • US826749
    • 1997-03-24
    • Hiroaki YodaAtsuhito SawabeNaoyuki InoueAkio Hori
    • Hiroaki YodaAtsuhito SawabeNaoyuki InoueAkio Hori
    • G11B5/31
    • G11B5/3113G11B5/3116G11B5/313G11B5/3146G11B5/3153G11B5/3163
    • A thin-film magnetic head comprising a lower magnetic core formed on a substrate, an upper magnetic core formed on the lower magnetic core with a magnetic gap therebetween, and a coil interposed between the lower magnetic core and the upper magnetic core as insulated from the lower magnetic core and the upper magnetic core, characterized in that at least either of the lower magnetic core and the upper magnetic core comprises a front body of a magnetic pole facing a magnetic recording medium and a rear body of a magnetic pole having part thereof superposed on the front body of the magnetic pole, the rear body of the magnetic pole is disposed as recessed from the head surface facing the medium and held in contact with the front body of the magnetic pole in a plane, the plane is terminated at a rear of the end of the front body of the magnetic pole, and the rear body of the magnetic pole has a shape curved or bent in the direction opposite to the magnetic gap, and further the front body of the magnetic pole is composed of a magnetic member embedded in a trench formed in advance in an insulating layer.
    • 一种薄膜磁头,包括形成在基板上的下磁芯,形成在下磁芯上的上磁芯,其间具有磁隙,以及插入在下磁芯和上磁心之间的线圈, 下磁芯和上磁芯,其特征在于,下磁芯和上磁芯中的至少一个包括面向磁记录介质的磁极的前体和磁极的后体,其部分叠加 在磁极的前体上,磁极的后体被设置为从面向介质的头表面凹陷并且在平面中与磁极的前体保持接触,平面终止在后面 的磁极的前体的端部,并且磁极的后体具有与磁隙相反的方向弯曲或弯曲的形状,并且还具有前体o f磁极由嵌入在预先形成在绝缘层中的沟槽中的磁性构件组成。
    • 6. 发明授权
    • Magnetic head with magneto-resistance effect element disposed on opposite side of magnetic core pair from recording coil
    • 具有磁阻效应元件的磁头设置在与记录线圈的磁芯对的相对侧上
    • US06285531B1
    • 2001-09-04
    • US09040353
    • 1998-03-16
    • Yuichi OhsawaHiroaki YodaAkio HoriMasatoshi YoshikawaMasashi Sahashi
    • Yuichi OhsawaHiroaki YodaAkio HoriMasatoshi YoshikawaMasashi Sahashi
    • G11B539
    • G11B5/3967G11B5/2652G11B5/313G11B5/332G11B5/4886
    • A magnetic head has a recording magnetic yoke on the side of an air bearing surface of which a recording magnetic gap film is interposed and a reproducing magnetic yoke on the side of an air bearing surface of which a reproducing magnetic gap film is interposed. The magnetic yoke can serve concurrently for recording/reproducing. A recording coil supplying a recording magnetic flux to a recording medium through a recording magnetic yoke is disposed along one main surface of a magnetic yoke. An MR element in which a signal magnetic flux is led from a recording medium through a reproducing magnetic yoke is disposed along the other main surface on opposite side from a recording coil of a magnetic yoke. Or, at least on extension of a film plane of a magnetic gap film, a ferromagnetic layer is disposed so as for a film plane to exist in almost perpendicular direction relative to the film plane. According to such a head structure, reproducing sensitivity decrease of the reproducing MR head due to noise or occurrence of recording fringe can be suppressed.
    • 磁头在记录磁隙膜的空气轴承表面一侧具有记录磁轭,并且在其中插入有再现磁隙膜的空气轴承表面侧的再现磁轭。 磁轭可以同时用于记录/再现。 通过记录磁轭向记录介质提供记录磁通的记录线圈沿磁轭的一个主表面设置。 通过再现磁轭将信号磁通从记录介质引出的MR元件沿与磁轭的记录线圈相反的另一个主表面设置。 或者,至少在磁隙膜的膜平面延伸的情况下,设置铁磁层,以使膜平面相对于膜平面以大致垂直的方向存在。 根据这种头部结构,可以抑制由于噪声或记录条纹的发生而导致的再现MR磁头的再现灵敏度降低。
    • 7. 发明授权
    • Magnetic head
    • 磁头
    • US6108167A
    • 2000-08-22
    • US150926
    • 1998-09-10
    • Kohichi TateyamaHiroaki YodaTadahiko KobayashiHiromi SakataMichiko HaraAkio HoriTakashi KoizumiTomohiko Nagata
    • Kohichi TateyamaHiroaki YodaTadahiko KobayashiHiromi SakataMichiko HaraAkio HoriTakashi KoizumiTomohiko Nagata
    • G11B5/31G11B5/39G11B5/187
    • G11B5/3109G11B5/3146G11B5/3153G11B5/3116G11B5/3163G11B5/3967
    • At least one magnetic pole out of a pair of magnetic poles is provided with a T-shaped magnetic pole having a magnetic pole chip at the position contacting with a magnetic gap and an auxiliary magnetic pole which is wider than thereof. The proximity of an air bearing surface of the T-shaped magnetic pole is composed of a laminated film containing a magnetic material layer with a high saturated magnetic flux density which composes the magnetic pole chip and a portion of the auxiliary magnetic pole and a magnetic material layer with a low saturated magnetic flux density which composes the remaining portion of the auxiliary magnetic pole. When the front portion of the magnetic pole with the track width of 1.8 .mu.m or less is composed of a laminated film containing a magnetic material layer having a high saturated magnetic flux density and a magnetic material layer having a low saturated magnetic flux density, the thickness of the magnetic material layer having the high saturated magnetic flux density is 0.5 .mu.m or more. According to the above described magnetic pole, the magnetic saturation near the tip portion of the magnetic pole is controlled, so that preferable magnetic field strength and magnetic field gradient can be attained when the track width is narrowed.
    • 在一对磁极中的至少一个磁极设置有在与磁隙接触的位置处具有磁极片的T形磁极和比其宽的辅助磁极。 T形磁极的空气轴承表面的接近度由包含构成磁极片和辅助磁极的一部分的磁性材料层和具有高饱和磁通密度的磁性材料层的叠层膜构成, 具有构成辅助磁极的剩余部分的低饱和磁通密度的层。 当轨道宽度为1.8μm或更小的磁极的前部由包含具有高饱和磁通密度的磁性材料层和具有低饱和磁通密度的磁性材料层的层叠膜构成时, 具有高饱和磁通密度的磁性材料层的厚度为0.5μm以上。 根据上述磁极,控制磁极尖端部附近的磁饱和,从而当磁道宽度变窄时可以获得优选的磁场强度和磁场梯度。