公开(公告)号：US06261471B1

公开(公告)日：2001-07-17

申请号：US09418892

申请日：1999-10-15

申请人： Shiro Tsuda ,  Yasutake Hirota ,  Hisao Suzuki

发明人： Shiro Tsuda ,  Yasutake Hirota ,  Hisao Suzuki

IPC分类号： C04B128

CPC分类号： H01F1/44

摘要： The invention relates to a composition and a process for producing a magnetic fluid comprising finely divided magnetic particles covered with at least one surfactant. A fluorocarbon-silane surface modifier is employed which is added to cover the free oxidizable exterior surface of the outer layer of the particles to increase the acid resistance of the colloid.

摘要翻译： 本发明涉及包含用至少一种表面活性剂覆盖的细碎磁性颗粒的磁性流体的组合物和方法。 使用碳氟硅烷表面改性剂，其加入以覆盖颗粒外层的游离可氧化外表面以增加胶体的耐酸性。

公开(公告)号：US06277298B1

公开(公告)日：2001-08-21

申请号：US09429189

申请日：1999-10-28

申请人： Lucian Borduz ,  Shiro Tsuda ,  Yasutake Hirota

发明人： Lucian Borduz ,  Shiro Tsuda ,  Yasutake Hirota

IPC分类号： H01F128

CPC分类号： H01F1/44

摘要： The invention relates to a composition and process for producing a chemically stable magnetic fluid comprising a plurality of magnetic particles covered first with a small molecular weight surface modifier, which is a nondispersant and acts as a surfactant-accepting layer, and then with at least one surfactant. The surface modifier/surfactant coated magnetic particles are then suspended in a silicone oil-based, hydrocarbon oil-based or an ester oil-based carrier liquid.

摘要翻译： 本发明涉及一种用于生产化学稳定的磁性流体的组合物和方法，其包括首先用小分子量表面改性剂覆盖的多个磁性颗粒，所述小分子量表面改性剂是非分散性的并且用作表面活性剂接受层，然后与至少一种 表面活性剂。 然后将表面改性剂/表面活性剂涂覆的磁性颗粒悬浮在硅油基烃油或酯油基载体液体中。

公开(公告)号：US6056889A

公开(公告)日：2000-05-02

申请号：US948951

申请日：1997-10-10

申请人： Shiro Tsuda ,  Kacey Wiley Heckman ,  Yasutake Hirota ,  Stefan Borduz ,  Lucian Borduz

发明人： Shiro Tsuda ,  Kacey Wiley Heckman ,  Yasutake Hirota ,  Stefan Borduz ,  Lucian Borduz

IPC分类号： H01F1/34 ,  H01F1/44

CPC分类号： H01F1/44

摘要： The invention relates to a composition and a process for producing a chemically stable magnetic fluid comprising finely divided magnetic particles covered with surfactants. A surface modifier is also employed which is added to cover thoroughly the free oxidizable exterior surface of the outer layer of the particles to assure better chemical stability of the colloid under different environmental conditions.

摘要翻译： 本发明涉及一种用于生产化学稳定的磁性流体的组合物和方法，其包括用表面活性剂覆盖的细碎磁性颗粒。 还使用表面改性剂，其被完全覆盖颗粒外层的可氧化的外表面，以确保在不同环境条件下胶体的更好的化学稳定性。

公开(公告)号：US07729504B2

公开(公告)日：2010-06-01

申请号：US11668736

申请日：2007-01-30

申请人： Shiro Tsuda ,  Ronald E. Rosensweig

发明人： Shiro Tsuda ,  Ronald E. Rosensweig

IPC分类号： H04R25/00

CPC分类号： H04R9/041 ,  H04R9/027 ,  H04R2400/00

摘要： An audio speaker has a driver unit having a support frame with a central portion forming a magnetic structure defining an annular gap around a central magnetic post, a vibration system having a diaphragm and a voice coil, the voice coil is attached to one side of the diaphragm where the vibration system is fixed to the support frame and where the voice coil is movably mounted in the annular gap, and a magnetic fluid disposed in the annular gap only in a space between one side of the voice coil and a surface of the annular gap having a higher magnetic flux density.

摘要翻译： 音频扬声器具有驱动单元，该驱动器单元具有支撑框架，中心部分形成围绕中心磁柱限定环形间隙的磁性结构，具有隔膜和音圈的振动系统，音圈连接到 隔膜，其中振动系统固定到支撑框架上，并且其中音圈可移动地安装在环形间隙中，并且磁性流体仅在音圈的一侧和环形表面之间的空间中设置在环形间隙中 间隙具有较高的磁通密度。

公开(公告)号：US07266214B2

公开(公告)日：2007-09-04

申请号：US11001955

申请日：2004-11-30

申请人： Shiro Tsuda

发明人： Shiro Tsuda

IPC分类号： H04R25/00

CPC分类号： H04R31/006 ,  H04R9/025 ,  H04R9/027 ,  H04R9/041 ,  H04R2209/024 ,  Y10T29/49005

摘要： An audio speaker includes a driver unit having a magnetic pole case defining a radial gap, a vibration system having a diaphragm and a voice coil where the vibration system is fixed to the drive unit and the voice coil is movably mounted into the radial gap, and a residual magnetic fluid layer disposed on the surfaces of one or more of the magnetic pole case and the voice coil where an air gap exists between the voice coil and the magnetic pole case.

摘要翻译： 音频扬声器包括具有限定径向间隙的磁极壳体的驱动器单元，具有振动膜的振动系统和音圈固定到驱动单元的音圈，音圈可移动地安装在径向间隙中，以及 剩余的磁性流体层设置在磁极壳体和音圈之间的一个或多个的表面上，在音圈和磁极盒之间存在气隙。

公开(公告)号：US06804368B2

公开(公告)日：2004-10-12

申请号：US10121129

申请日：2002-04-11

申请人： Shiro Tsuda

发明人： Shiro Tsuda

IPC分类号： H04R2500

CPC分类号： H04R31/006 ,  H04R9/027 ,  H04R9/041 ,  Y10T29/49005

摘要： The method of assembling a micro-speaker includes disposing a quantity of volatile magnetic fluid into a radial gap of a driver unit, aligning a vibration system having a diaphragm and a voice coil to the driver unit such that the voice coil is accommodated into the radial gap, fixing the vibration system to the driver unit, and removing the volatile component of the volatile magnetic fluid. The micro-speaker includes a driver unit having a housing, a magnet disposed within the housing forming a radial gap between the magnet and the circumferential walls of the housing, and a magnetic plate disposed on the magnet, a vibration system having a diaphragm and a voice coil where the vibration system is fixed to the drive unit and the voice coil protrudes into the radial gap, and a volatile magnetic fluid in the radial gap about the voice coil.

摘要翻译： 微型扬声器的组装方法包括将一定量的挥发性磁性流体设置在驱动单元的径向间隙中，将具有隔膜的振动系统和音圈对准到驱动单元，使得音圈容纳在径向 间隙，将振动系统固定到驱动器单元，以及去除挥发性磁性流体的挥发性成分。 微型扬声器包括具有壳体的驱动器单元，设置在壳体内的磁体，形成磁体和壳体的周壁之间的径向间隙，以及设置在磁体上的磁性板，具有隔膜和 声音线圈，其中振动系统固定到驱动单元，音圈突出到径向间隙中，以及在音圈周围的径向间隙中的挥发性磁性流体。

公开(公告)号：US5730893A

公开(公告)日：1998-03-24

申请号：US753908

申请日：1996-12-03

申请人： John E. Wyman ,  Shiro Tsuda

发明人： John E. Wyman ,  Shiro Tsuda

IPC分类号： H01F1/44

CPC分类号： H01F1/44

摘要： A novel magnetic colloid composition containing a polar ester carrier liquid, magnetic particles, and an acid terminated poly (12-hydroxystearic acid) dispersant of the Formula I: ##STR1## where "R" is selected from the group consisting of alkyls, aralkyls, and aryls, substituted or unsubstituted, and "n" is an integer from 0 to 4, or mixtures thereof where "R" and "n" may be the same or different.

摘要翻译： 含有极性酯载体液体，磁性颗粒和式I的酸封端的聚（12-羟基硬脂酸）分散剂的新型磁性胶体组合物：其中“R”选自烷基，芳烷基， 和芳基，取代或未取代的，“n”为0至4的整数，或其混合物，其中“R”和“n”可以相同或不同。

公开(公告)号：US5656196A

公开(公告)日：1997-08-12

申请号：US356519

申请日：1994-12-15

申请人： Shiro Tsuda ,  Mayumi Takayama

发明人： Shiro Tsuda ,  Mayumi Takayama

IPC分类号： B01J13/00 ,  C09K15/18 ,  C10M125/10 ,  C10N10/16 ,  C10N40/14 ,  H01F1/44 ,  C09K3/00 ,  C09K15/00

CPC分类号： H01F1/44 ,  H01F1/445

摘要： The present invention relates to a ferrofluid composition having improved oxidation resistance, which contains a carrier liquid, magnetic particles in a stable colloidal suspension, and from about 5% to about 50% by weight of an antioxidant.

摘要翻译： 本发明涉及具有改善的抗氧化性的铁磁流体组合物，其含有载体液体，稳定的胶体悬浮液中的磁性颗粒和约5％至约50％的抗氧化剂。

公开(公告)号：US07063802B2

公开(公告)日：2006-06-20

申请号：US10402527

申请日：2003-03-28

申请人： Shiro Tsuda ,  Koji Nemoto ,  Nobuharu Iijima ,  Nobuaki Kurihara

发明人： Shiro Tsuda ,  Koji Nemoto ,  Nobuharu Iijima ,  Nobuaki Kurihara

IPC分类号： H01F1/44

CPC分类号： H01F1/44

摘要： An element-modified ferrofluid comprising a base oil, a plurality of magnetic particles covered with at least one surfactant, and an elemental modifier. The elemental modifier is a metal, a metal mixture, an alloy, or a nonmetal.

摘要翻译： 一种元素改性的铁磁流体，其包含基础油，多个被至少一种表面活性剂覆盖的磁性颗粒和元素改性剂。 元素改性剂是金属，金属混合物，合金或非金属。

公开(公告)号：US20050105758A1

公开(公告)日：2005-05-19

申请号：US11001955

申请日：2004-11-30

申请人： Shiro Tsuda

发明人： Shiro Tsuda

IPC分类号： H04R9/02 ,  H04R9/04 ,  H04R31/00 ,  H04R1/00 ,  H04R9/06

CPC分类号： H04R31/006 ,  H04R9/025 ,  H04R9/027 ,  H04R9/041 ,  H04R2209/024 ,  Y10T29/49005

摘要： An audio speaker includes a driver unit having a magnetic pole case defining a radial gap, a vibration system having a diaphragm and a voice coil where the vibration system is fixed to the drive unit and the voice coil is movably mounted into the radial gap, and a residual magnetic fluid layer disposed on the surfaces of one or more of the magnetic pole case and the voice coil where an air gap exists between the voice coil and the magnetic pole case.

摘要翻译： 音频扬声器包括具有限定径向间隙的磁极壳体的驱动器单元，具有振动膜的振动系统和音圈固定到驱动单元的音圈，音圈可移动地安装在径向间隙中，以及 剩余的磁性流体层设置在磁极壳体和音圈之间的一个或多个的表面上，在音圈和磁极盒之间存在气隙。