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41. 发明申请

US20050012245A1 Method for manufacturing magnetic recording medium substrates 审中-公开
标题翻译：磁记录介质基板的制造方法
公开(公告)号：US20050012245A1
公开(公告)日：2005-01-20
申请号：US10889272
申请日：2004-07-12
申请人： Masatoshi Ishii , Toshihiro Tsumori , Ken Ohashi
发明人： Masatoshi Ishii , Toshihiro Tsumori , Ken Ohashi
IPC分类号： B23K26/40 , G11B5/84 , H01S3/00 , B23K26/00 , B26D3/16
CPC分类号： G11B5/8404 , B23K26/40 , B23K2101/40 , B23K2103/50
摘要： Provided is a method for improving the productivity of a coring step. More specifically, provided is a method for manufacturing a substrate for a magnetic recording medium substrate, comprising a step of coring for obtaining a plurality of doughnut-shaped substrates having a diameter of at most 55 mm from a monocrystalline silicon wafer of a diameter having at least 150 mm and at most 300 mm, wherein the coring is performed such that a leftover wafer excluding the plurality of substrates remains in one piece. In said step of coring, the coring is preferably performed using a laser cutting or a water jet cutting such that said minimum width of said surface of said leftover wafer is 1.5 to 2.5 times the thickness of the wafer.
摘要翻译：提供了一种提高取芯步骤的生产率的方法。更具体地，提供了一种用于制造用于磁记录介质基板的基板的方法，包括以下步骤：从具有至少55mm直径的单晶硅晶片获得直径至多为55mm的多个环形基板至少150mm且至多300mm，其中进行取芯使得除了多个基板之外的剩余晶片保持一体。在所述取芯步骤中，所述取芯优选使用激光切割或水射流切割进行，使得所述剩余晶片的所述表面的所述最小宽度为所述晶片厚度的1.5至2.5倍。

42. 发明授权

US5864275A Opposed magnet-type magnetic circuit assembly with permanent magnets 失效
公开(公告)号：US5864275A
公开(公告)日：1999-01-26
申请号：US703450
申请日：1996-08-27
申请人： Ken Ohashi , Yuhito Yoneda , Koji Miyata , Yuji Inoue
发明人： Ken Ohashi , Yuhito Yoneda , Koji Miyata , Yuji Inoue
IPC分类号： G01R33/383 , G01R33/3873 , G01R33/20
CPC分类号： G01R33/383 , G01R33/3873
摘要： Proposed is an improvement in an opposed-magnet magnetic circuit assembly with permanent magnets suitable for use, for example, in an MRI instrument comprising a pair of upper and lower permanent magnets to form a magnetic-field gap space therebetween, a pair of magnetic-field adjustment plates each on the surface of the permanent magnet to face the gap space and a pair of back yokes each on the back surface of the permanent magnet. According to the first aspect of the invention, a combination of a gradient coil and a shimming plate is mounted on the magnetic-field adjustment plate with intervention of several pieces of shim members and, further, another set of second shim members are bonded to the surface of the shimming plate facing the gap space with an object to improve the uniformity of the magnetic field in the gap space. According to the second aspect of the invention, which is directed to the problem of alleviation of the oppressive sense received by the patient lying in the MRI instrument due to his encaved condition, the back yokes are magnetically and mechanically connected with two and only two columnar connecting yokes each of which has a smaller cross section in the center portion than in the upper and lower end portions in order to ensure lateral openness on both sides of the patient. Preferable configurations are also proposed for the back yokes and the permanent magnets.

43. 发明授权

US5774034A Magnet assembly in MRI instrument 失效
标题翻译： MRI仪器中的磁铁组件
公开(公告)号：US5774034A
公开(公告)日：1998-06-30
申请号：US706349
申请日：1996-08-30
申请人： Yuhito Yoneda , Koji Miyata , Ken Ohashi , Dai Higuchi
发明人： Yuhito Yoneda , Koji Miyata , Ken Ohashi , Dai Higuchi
IPC分类号： G01R33/385 , A61B5/055 , G01R33/383 , G01R33/3873 , G01R33/565 , G01V3/00
CPC分类号： G01R33/383 , G01R33/3873 , G01R33/56518
摘要： Proposed is an improvement in a magnet assembly of an MRI instrument of the permanent magnet type comprising a pair of permanent magnets facing each other and forming a magnet gap therebetween. A pair of pole pieces each of which are mounted on one of the permanent magnets and a pair of gradient-field coils each of which are mounted on one of the pole pieces where both the pole pieces and coils face the gap. With an object of the invention to cancel the adverse influences caused by the residual magnetization of the pole pieces by the gradient magnetic field generated in the gradient-field coils. The invention proposes providing a pair of magnetic-field compensation members each on one of the gradient-field coils so that the residual magnetization in the compensation members generates a magnetic field which is compensatory for the magnetic field due to the residual magnetization in the pole pieces.
摘要翻译：提出了一种永磁体MRI仪器的磁体组件的改进，其包括彼此面对的一对永磁体，并在其间形成磁隙。一对极片安装在一个永磁体上，一对倾斜磁场线圈分别安装在磁极片之一上，两个极片和线圈都面对间隙。本发明的目的是通过在梯度场线圈中产生的梯度磁场来消除由极片的剩余磁化引起的不利影响。本发明提出在梯度场线圈中的一个上提供一对磁场补偿元件，使得补偿元件中的剩余磁化产生由于极片中的剩余磁化而导致的磁场补偿的磁场。

44. 发明授权

US5576679A Cylindrical permanent magnet unit suitable for gyrotron 失效
标题翻译：适用于旋转管的圆柱形永久磁铁单元
公开(公告)号：US5576679A
公开(公告)日：1996-11-19
申请号：US547343
申请日：1995-10-24
申请人： Ken Ohashi , Takeo Takada , Toshiyuki Kikunaga
发明人： Ken Ohashi , Takeo Takada , Toshiyuki Kikunaga
IPC分类号： H01J23/10 , H01F7/02
CPC分类号： H01J23/10 , H01J2225/025
摘要： The invention provides a cylindrical permanent magnet unit suitable for application to gyrotrons. Essentially the magnet unit consists of two cylindrical permanent magnets which are coaxially aligned, and there is a space between the two cylindrical magnets. Each of the two cylindrical magnet is a coaxially juxtaposed assembly of a plurality of ring-like permanent magnets, and each ring-like magnet is constructed of a plurality of permanent magnet segments. In one of the two cylindrical magnets every ring-like permanent magnet is magnetized in radial directions from the inside toward the outside, and in the other every ring-like permanent magnet is magnetized in radial directions from the outside toward the inside. In the bore of the cylindrical magnet unit the magnetic field is in the direction of the longitudinal center axis of the bore. By virtue of the space between the two cylindrical magnets, the distribution of flux density in the direction of the center axis becomes flat in a middle section of the bore. A ring-like member of a nonmagnetic material may be inserted in the aforementioned space.
摘要翻译：本发明提供一种适用于旋转陀螺仪的圆柱形永久磁铁单元。本质上，磁体单元由同轴对准的两个圆柱形永磁体组成，并且在两个圆柱形磁体之间存在空间。两个圆柱形磁体中的每一个是多个环形永磁体的同轴并置的组件，并且每个环形磁体由多个永磁体段构成。在两个圆柱形磁体之一中，每个环形永久磁铁从内向外被径向磁化，而另一个环形永久磁铁从外侧到内侧沿径向方向磁化。在圆柱形磁体单元的孔中，磁场在孔的纵向中心轴线的方向上。由于两个圆柱形磁体之间的空间，在孔的中间部分中的磁心密度在中心轴线方向上的分布变得平坦。可以在上述空间中插入非磁性材料的环状构件。

45. 发明授权

US5512872A Permanent magnet arrangement for use in magnetron plasma processing 失效
标题翻译：用于磁控管等离子体处理的永磁体布置
公开(公告)号：US5512872A
公开(公告)日：1996-04-30
申请号：US179551
申请日：1994-01-10
申请人： Ken Ohashi
发明人： Ken Ohashi
IPC分类号： C23C14/35 , C23F4/00 , H01J37/34 , H01L21/203 , H01L21/302 , H01L21/3065 , H05H1/46 , H03F7/02
CPC分类号： H01J37/3408
摘要： A permanent magnet arrangement for magnetron plasma processing is disclosed. The arrangement includes a plurality of permanent magnets each of which has a fan-shaped or equilateral cross section parallel to the major surfaces thereof. The permanent magnets are assembled to form the permanent magnet arrangement which takes a disk-like configuration or a polygon. Each of the plural permanent magnets is made of rare-earth material and radially or essentially radially magnetized.
摘要翻译：公开了一种用于磁控管等离子体处理的永磁体装置。该装置包括多个永磁体，每个永磁体具有平行于其主表面的扇形或等边横截面。永磁体被组装以形成采用盘状结构或多边形的永磁体布置。多个永磁体中的每一个由稀土材料制成，并且径向或基本上径向磁化。

46. 发明授权

US5057165A Rare earth permanent magnet and a method for manufacture thereof 失效
标题翻译：稀土永磁体及其制造方法
公开(公告)号：US5057165A
公开(公告)日：1991-10-15
申请号：US558788
申请日：1990-07-27
申请人： Hiroaki Nagata , Ken Ohashi , Yoshio Tawara , Kenichi Uesaka
发明人： Hiroaki Nagata , Ken Ohashi , Yoshio Tawara , Kenichi Uesaka
IPC分类号： H01F1/053 , C22C1/04 , C22C19/07 , H01F1/055
CPC分类号： H01F1/0557 , C22C1/0441 , H01F1/055
摘要： A rare earth permanent magnet of a composition, Ce(CO.sub.1-x-y-a Fe.sub.x Cu.sub.y M.sub.a).sub.z, where a, x, y, and z are: 0.005

47. 发明授权

US4678634A Method for the preparation of an anisotropic sintered permanent magnet 失效
标题翻译：各向异性烧结永磁体的制备方法
公开(公告)号：US4678634A
公开(公告)日：1987-07-07
申请号：US851529
申请日：1986-04-14
申请人： Yoshio Tawara , Ken Ohashi
发明人： Yoshio Tawara , Ken Ohashi
IPC分类号： H01F13/00 , H01F41/02 , B22F1/00
CPC分类号： H01F41/0273 , H01F13/003 , Y10S29/095
摘要： Method of preparing an anisotropic permanent magnet by a powder metallurgical technique, in which, the step of orientation of anisotropically magnetic particles during shaping by compression to give a green body prior to sintering, the magnetic field is applied pulse-wise to the mass of magnetic particles and an impacting compressive force is applied to the thus oriented particles in the direction parallel to the magnetic field during the period in which a pulse of the pulse-wise magnetic field is sustained. This method ensures a much higher degree of particle orientation than in the conventional static-field method by virtue of the possibility of obtaining a much stronger magnetic field without problems which otherwise are unavoidable. The principle of the method is applicable to the preparation of a cylindrical or annular permanent magnet magnetizable in a plurality of radial directions.
摘要翻译：通过粉末冶金技术制备各向异性永久磁体的方法，其中，通过压缩成型期间各向异性磁性颗粒的取向步骤在烧结之前产生生坯，将磁场脉冲地施加到磁性体在持续脉冲方向磁场的脉冲期间，颗粒和冲击压力在平行于磁场的方向上施加到这样取向的颗粒上。由于可以获得更强的磁场而不存在问题，因此这种方法确保了比传统的静态方法高得多的颗粒取向度，否则这是不可避免的。该方法的原理适用于制备可沿多个径向磁化的圆柱形或环形永磁体。

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