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1. 发明专利

JPH0698870A NUCLEAR MAGNETIC RESONATOR 失效
公开(公告)号：JPH0698870A
公开(公告)日：1994-04-12
申请号：JP25138492
申请日：1992-09-21
申请人： HITACHI LTD
发明人： FUKUTOMI KIYOSHI , TAKAHASHI TAKAO , MIYAJIMA TAKESHI
IPC分类号： A61B5/055 , G01N33/38 , G01R33/20 , G01R33/38 , G01R33/385 , H01F7/20
摘要： PURPOSE:To provide a nuclear magnetic resonator which has a gradient magnetic field generating means with intensity and linearity improved of a gradient magnetic field generated. CONSTITUTION:Coils 4A, 4B, 4C, 4D, 5A, 5B, 5C and 5D for gradient magnetic fields are arranged on an circumferential surface of a cylindrical bobbin 3. The coils 5A, 5B, 5C and 5D are of a distribution type and the coils 4A, 4B, 4C and 4D are of a concentration type. The coil 4A is piles on the coil 5A so that a magnetic field of the same direction is generated. Likewise, the oil 4B is piled on the coil 5B, the coil 4C on the coil 5C and the coil 4D on the coil 5D. Moreover, the coils 4A, 5A are opposed to the coils 4B, 5B. The coils 4C and 5C are opposed to the 4D and 5D respectively. With the coils 4A-4D and 5A-5D thus arranged, gradient magnetic field is generated in the direction (y) inside the bobbin 3.

2. 发明专利

JPH0669027A MAGNETIC FIELD GENERATION DEVICE 失效
公开(公告)号：JPH0669027A
公开(公告)日：1994-03-11
申请号：JP27745491
申请日：1991-10-24
申请人： HITACHI LTD , HITACHI INSTRUMENTS ENG
发明人： MIYAJIMA TAKESHI , TAKAHASHI TAKAO , KONNO TAKEHIKO
IPC分类号： H01F7/20 , G01R33/383 , G01R33/421 , H01F6/00 , H01F7/22
摘要： PURPOSE:To realize a new type self-shielding type superconducting magnet developed removing the defects of three types of active shielding type superconducting magnets using iron self-shielding type superconducting coils and a hybrid type superconducting magnet, which is a combination type of the active shielding type super-conducting magnets. CONSTITUTION:In an iron self-shielding type superconducting magnet system consisting of an SCM (a superconducting magnet) 17 and a lightened ferromagnetic magnetic shielding material 19, leakage magnetic field negating normal conducting coil groups + iron self-shielding combination type superconducting coils of 23, 24 and 25 are realized. Accordingly, the problem of an excessive weight, which is the only defect of an iron self-shielding type superconducting magnet, is solved without spoiling most of the strong points of the magnet to lighten the magnet, the cost of the magnet is low, the transferability of the magnet is good, the magnetic shielding efficiency of the magnet is superior and a high even magnetic field is obtained.

3. 发明专利

JPH02159246A INCLINED MAGNETIC FIELD COIL APPARATUS 失效
公开(公告)号：JPH02159246A
公开(公告)日：1990-06-19
申请号：JP31387488
申请日：1988-12-14
申请人： HITACHI LTD
发明人： MIYAJIMA TAKESHI , TAKAHASHI TAKAO , SHUDO TAKESHI , SUZUKI SHOHEI
IPC分类号： G01R33/20 , A61B5/026 , A61B5/055 , G01R33/385 , H01F7/20
摘要： PURPOSE:To prevent a lowering of an effective inclined magnetic field and a lowering of linearity by determining the ampere turn ratio of a pair of the first and second coils so as to make the same equal to the tertiary term magnetic field component ratio at the position arranged from a pair of the second and first coils. CONSTITUTION:A pair of the first coils are arranged at a position d1 where the primary term magnetic field component in a Z-axis direction becomes max. or almost max. The ratio ¦Z (d1)/Z (d1)¦ of the tertiary and quinary term magnetic field components in the Z-axis direction at the position d1 is made equal to the ratio ¦Z (d1)/Z (d1)¦ of the tertiary and quinary term magnetic field components in the Z-axis direction at a position d2 and a pair of the second coils are arranged at the position d2. Further, the ratio ¦Z (d2)/Z (d1)¦ of tertiary term magnetic field components in the Z-axis direc tion at the positions d1, d2 is made substantially equal to the ratio ¦Z (d2)/Z (d1)¦ of quinary term magnetic field components in the Z-axis direction at the positions d2, d1 and further made equal to the ampere turn ratio I1N1/I2N2(I is a current and N is a number of turns) with a pair of the first and second coils. A lowering of a primary term magnetic field component is eliminated and, since tertiary and quinary term magnetic field components are cancelled, a lowering of linearity is also eliminated.

4. 发明专利

JPS61100644A Electromagnet for generating uniform magnetic field 失效
标题翻译：用于产生均匀磁场的电磁体
公开(公告)号：JPS61100644A
公开(公告)日：1986-05-19
申请号：JP22214284
申请日：1984-10-24
申请人： Hitachi Ltd
发明人： TAKAHASHI TAKAO
IPC分类号： G01R33/20 , A61B5/055 , A61B10/00 , G01R33/38 , G01R33/3875 , H01F7/20
CPC分类号： G01R33/3875
摘要： PURPOSE:To make it possible to generate a magnetic field having a highly uniform degree, by arranging a correction coil at a position, where the high uniformity of a magnetic field can be realized, with respect to the field coil of a medical nuclear magnetic resonance tomographic apparatus. CONSTITUTION:(a) is the inner radius of a field coil 1 and two-dimensional coordinates of each point are displayed as distances in the radius direction and the axial direction when the center position of the field coil 2 was set to the origin. Correction coils 2, 3 correct the spacial variation in the static magnetic field due to the field coil 1 of the electromagnet for a nuclear magnetic resonance apparatus. By placing the cross-sectional center position O' of the coil conductors of the correction coils 2, 3 within the cross-sectional region R formed by connecting a point P1(a, 1.66a), a point P2(1.07a, 1.76a), a point P3(1.10a, 2.13a), a point P4(1.07a, 2.45a), a point P5(a, 2.55a), a point P6(a, 2.32a), a point P7(1.04a, 2.24a), a point P8(1.06a, 2.04a), a point P9(1.04a, 1.84a) and a point P10(a, 1.75a), a magnetic field having a highly uniform degree can be generated.
摘要翻译：目的：为了能够产生具有高度均匀度的磁场，通过在可以实现高磁场均匀性的位置处布置校正线圈，相对于医用核磁共振的场线圈断层摄影装置构成：（a）是励磁线圈1的内半径，当将励磁线圈2的中心位置设定为原点时，将各点的二维坐标显示为半径方向和轴方向的距离。校正线圈2,3校正由于核磁共振装置的电磁体的励磁线圈1引起的静磁场的空间变化。通过将校正线圈2,3的线圈导体的横截面中心位置O'设置在通过连接点P1（a，1.66a）形成的横截面区域R中，将点P2（1.07a，1.76a）），点P3（1.10a，2.13a），点P4（1.07a，2.45a），点P5（a，2.55a），点P6（a，2.32a），点P7（1.04a ，2.24a），点P8（1.06a，2.04a），点P9（1.04a，1.84a）和点P10（a，1.75a），可以产生具有高度均匀度的磁场。

5. 发明专利

JPS5155517A DENJITEKINA SHIJI OYOBI ANNAISOCHI 失效
公开(公告)号：JPS5155517A
公开(公告)日：1976-05-15
申请号：JP12899874
申请日：1974-11-11
申请人： HITACHI LTD
发明人： SHIROKURA TOSHIJI , TAKAHASHI TAKAO , MYASHITA TAKAO
IPC分类号： B60L13/04 , B61B13/08

6. 发明专利

JPH0282943A MAGNETIC FIELD GENERATOR FOR MAGNETIC RESONANCE 失效
公开(公告)号：JPH0282943A
公开(公告)日：1990-03-23
申请号：JP23528188
申请日：1988-09-20
申请人： HITACHI LTD
发明人： MIYAJIMA TAKESHI , SHUDO TAKESHI , KURODA KUNISHIGE , TAKAHASHI TAKAO , SUZUKI SHOHEI
IPC分类号： G01R33/421 , A61B5/055 , G01R33/42
摘要： PURPOSE:To correct an inclined magnetic field and to miniaturize the title generator by providing a coil like closed circuit composed of the electric good conductor subjected to the inductive coupling with an inclined magnetic field coil between a static magnetic field coil and the inclined magnetic field coil and canceling the unnecessary leaked magnetic flux toward an ultralow temp. heat reflecting cylinder. CONSTITUTION:Canceling coil groups 18a, 18b are provided between a bore inner cylinder and an inclined magnetic field coil and connected so that a current direction becomes reverse by a pair of inclined magnetic field coils 17a, 17b generating the inclined magnetic field of the Z-term of the inclined magnetic field coil. Since an exciting current Igc has an AC component in rising and falling, the induced current Im in the direction opposite to the exciting current Igc flowing to a pair of the inclined magnetic field coils 17a, 17b flows to metal circular rings 18a, 18b. Since the induced current Im corresponds to the negating current in an active shield system inclined magnetic field coil system, the waveform of a distorted inclined magnetic field can be corrected.

7. 发明专利

JPS5763473A Cord ring setting method 失效
标题翻译：线环设置方法
公开(公告)号：JPS5763473A
公开(公告)日：1982-04-16
申请号：JP13766480
申请日：1980-10-03
申请人： Japan Atomic Energy Res Inst , Hitachi Ltd
发明人： OOKUBO MINORU , NISHIO SATOSHI , NISHIMURA HIDETOMO , TAKAHASHI TAKAO , TAKIZAWA TERUHIRO
IPC分类号： G21B1/11 , G21B1/00 , H05H1/12
CPC分类号： Y02E30/126

8. 发明专利

JPS55146274A WATER TURBINE RUNNER 失效
公开(公告)号：JPS55146274A
公开(公告)日：1980-11-14
申请号：JP5418979
申请日：1979-05-04
申请人： HITACHI LTD
发明人： MIMORI KIYOYASU , TAKAHASHI TAKAO , SATOU MASAYUKI , MORIGUCHI KAZUO
IPC分类号： F03B3/12
摘要： PURPOSE:To prevent a runner from being damaged by a method wherein a damping material is stuck on to the outer periphery of the runner to curb the vibration in the axial direction and thereby reduce a vibration stress concentrating on the part of joint of a blade in a pump wheel and a turbine. CONSTITUTION:In the runner of a turbine having a large capacity and rotating at a high speed, a crown 1 and a shrouded ring 3 strongly vibrate in the axial direction by hydraulic pulsations, whereby the vibration stress occurs intensively in the part of joint of a blade 2. This vibration is damped by a damping material 54 stuck on to the outer periphery of the crown 1 and the shrouded ring 3, thereby the occuring vibration stress being reduced. As the damping material 54, synthetic resin or the stuff made beforehand of viscous and elastic materials is used, the former being molded into the objective place, while the latter being laminated in one or several layers thereon by sticking. In this way, a turbine runner bearable to high head and high speed can be obtained without a substantial change in the form of the exisiting machines.

9. 发明专利

JPS5180968A 失效
公开(公告)号：JPS5180968A
公开(公告)日：1976-07-15
申请号：JP472275
申请日：1975-01-08
申请人： HITACHI LTD
发明人： KUWABARA SHOJI , SUGAWARA HIROYUKI , TAKAHASHI TAKAO
IPC分类号： H01H33/00 , H01H9/16 , H01L39/14

10. 发明专利

JPH04336037A MAGNETIC FIELD GENERATING DEVICE 失效
公开(公告)号：JPH04336037A
公开(公告)日：1992-11-24
申请号：JP10552091
申请日：1991-05-10
申请人： HITACHI LTD
发明人： TAKAHASHI KAZUHIKO , TAKAHASHI TAKAO , ITO MOTOYA
IPC分类号： A61B5/055 , G01R33/3875 , G01R33/42 , G01R33/421
摘要： PURPOSE:To reduce the generation of the magnetomotive force of a cancel coil by magnetically connecting a magnetic substance flange part to an opening part between both end parts of an inner and outer magnetic substance pair. CONSTITUTION:An inner magnetic substance 3 and the outer magnetic substance of a cancel coil 2 are located between a main coil 1 to generate a ferromagnetic field and a cancel coil 2 having a current flowing in a reverse direction to that of the main coil. Since a magnetic flange part 5 is formed so that the inner and outer magnetic substances 3 and 4 are magnetically interconnected, an axial leakage magnetic field is reduced through the passage of it through a magnetic passage comprising the magnetic substance flange part 5 and the outer magnetic substance 4, whereby the generation of the magnetomotive force of the cancel coil 2 can be reduced.

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