公开(公告)号：US4700138A

公开(公告)日：1987-10-13

申请号：US873390

申请日：1986-06-12

申请人： Toru Shimazaki ,  Yoshihiko Watanabe ,  Hideto Iwaoka

发明人： Toru Shimazaki ,  Yoshihiko Watanabe ,  Hideto Iwaoka

IPC分类号： G01R33/48 ,  A61B5/055 ,  A61B10/00 ,  G01R33/36 ,  G01R33/20

CPC分类号： H04W24/02 ,  G01R33/3621 ,  H04W16/24

摘要： In measuring a number of echo signal, which normally attenuate chronologically, in a single pulse sequence, such as in multi-echo method or a multi-slice method, each echo signal is received and suitably amplified by a reception amplifier having predetermined levels of gain for different time periods during which the successive echo signals are processed such that the echo signals received at a data collection unit are all of substantially the same amplitude regardless of where they appear in the time sequence. The predetermined levels of gains are obtained by false scanning prior to actual image scanning and calculation and storing in a memory. As a result, the echo signals can be received within a dynamic range which is smaller than using the conventional system.

摘要翻译： 在按照时间顺序衰减的多个回波信号的测量中，以单脉冲序列（例如，以多回波方式或多切片方法）为单位，每个回波信号被接收并由具有预定增益水平的接收放大器适当地放大 在不同的时间段期间连续的回波信号被处理，使得在数据收集单元处接收的回波信号都基本上是相同的幅度，而不管它们在时间序列中出现的位置。 通过在实际图像扫描之前的伪扫描并计算和存储在存储器中来获得预定的增益水平。 结果，可以在小于使用传统系统的动态范围内接收回波信号。

公开(公告)号：US5061030A

公开(公告)日：1991-10-29

申请号：US567354

申请日：1990-08-14

申请人： Hiroshi Miyamoto ,  Hideto Iwaoka

发明人： Hiroshi Miyamoto ,  Hideto Iwaoka

IPC分类号： G02F1/035

CPC分类号： G02F1/0356

摘要： This invention enables low voltage operation and improves matching in velocities of the radio frequency and of light by lowering effective index and to thereby expand modulation frequency bandwidth by structuring an optical modulator where a substrate of the material of which refractive index changes by an application of electric field description, and the insulating buffer layers are eliminated from the regions other than the electrodes. By structuring the modulator in a manner to satisfy the prescribed conditions with dimensions of each unit, the light can be matched in complete phase matching (group velocity matching) with radio frequency while characteristic impedance of the electrodes is fixed at a desired value.

公开(公告)号：US4684889A

公开(公告)日：1987-08-04

申请号：US719750

申请日：1985-04-04

申请人： Keiki Yamaguchi ,  Kazuya Hoshino ,  Hideto Iwaoka

发明人： Keiki Yamaguchi ,  Kazuya Hoshino ,  Hideto Iwaoka

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/385 ,  G01R33/565 ,  G01N24/08

CPC分类号： G01R33/56563

摘要： An object which can provide a reference for measuring the intensity of a primary magnetic field, is positioned in the vicinity of a subject being examined. A variation in the primary magnetic field intensity is detected, based on a frequency shift of data observed of the object, and is used to control the primary magnetic field intensity, or reference frequency for phase detection, or to correct image data. In this manner image quality is prevented from being degraded due to the variation of the primary magnetic field intensity.

摘要翻译： 可以提供用于测量初级磁场的强度的参考的对象位于被检查对象的附近。 基于对象观察到的数据的频移来检测初级磁场强度的变化，并且用于控制初级磁场强度或用于相位检测的参考频率或校正图像数据。 以这种方式，由于初级磁场强度的变化，防止图像质量劣化。

公开(公告)号：US4623864A

公开(公告)日：1986-11-18

申请号：US723142

申请日：1985-04-15

申请人： Yuji Inoue ,  Hideto Iwaoka

发明人： Yuji Inoue ,  Hideto Iwaoka

IPC分类号： G01R33/20 ,  A61B5/055 ,  A61B10/00 ,  G01R33/381 ,  G01R33/3875 ,  H01F7/20 ,  H01F5/00

CPC分类号： G01R33/3875 ,  H01F7/20

摘要： A 4 coil type air core coil magnet used for NMR imaging apparatus, wherein each coil assembly comprises a plurality of pancake coil elements in layers, and in each of the coil elements the configuration of a predetermined portion and the winding length of the end portion is selectively controlled and connecting wiring between each coil element is parallel to the axis of the four coil assemblies, whereby highly uniform magnetic fields are obtained.

摘要翻译： 一种用于NMR成像设备的4线圈型空心线圈磁体，其中每个线圈组件包括多个薄饼线圈元件，并且在每个线圈元件中，预定部分的构型和端部的卷绕长度为 每个线圈元件之间的选择性地控制和连接布线平行于四个线圈组件的轴线，由此获得高度均匀的磁场。

公开(公告)号：US5583446A

公开(公告)日：1996-12-10

申请号：US351396

申请日：1995-02-14

申请人： Koichiro Takeuchi ,  Yukio Kasahara ,  Akira Miura ,  Hideto Iwaoka ,  Tadashi Sugiyama

发明人： Koichiro Takeuchi ,  Yukio Kasahara ,  Akira Miura ,  Hideto Iwaoka ,  Tadashi Sugiyama

IPC分类号： G01Q30/02 ,  G01Q60/24 ,  G01R1/06 ,  G01R1/067 ,  G01R1/07 ,  G01R19/00 ,  G01R31/28 ,  G01R31/302 ,  G01R31/316 ,  G01R31/02

CPC分类号： G01R31/2886 ,  B82Y35/00 ,  G01Q60/38 ,  G01R1/06711 ,  G01R1/071 ,  Y10S977/868

摘要： A needle-shaped terminal, i.e., a probe tip, is brought into extremely close proximity with an object being measured. This probe tip is formed from an optically active material and in itself is electrically non-conductive, so that it has no electrical influence whatsoever on the object being measured. When optical pulses are beamed onto this probe tip, the probe tip becomes an electric conductor and a current flows between it and the object being measured, so that the electric potential of the object can be measured. This facilitates previously impossible measurements of high-speed electric waveforms. It also facilitates high spatial resolution monitoring and control of probe tip position and characterization of measurement sites, and enables highly reliable measurements to be made inexpensively.

摘要翻译： PCT No.PCT / JP94 / 00611 Sec。 371日期：1995年2月14日 102（e）1995年2月14日PCT PCT 1994年4月12日PCT公布。 出版物WO94 / 24575 日期：1994年10月27日将针状端子，即探针尖端与被测量物体非常接近。 该探针尖端由光学活性材料形成，并且其本身是非导电的，使得其对所测量的物体无任何电学影响。 当光脉冲发射到该探针尖端上时，探针尖端变成电导体，并且电流在它和被测量物体之间流动，从而可以测量物体的电位。 这有助于以前不可能测量的高速电波形。 它还有助于高空间分辨率监测和控制探针尖端位置和测量位置的表征，并且可以低成本地实现高度可靠的测量。

公开(公告)号：US4629886A

公开(公告)日：1986-12-16

申请号：US591511

申请日：1984-03-20

申请人： Koji Akiyama ,  Hideto Iwaoka

发明人： Koji Akiyama ,  Hideto Iwaoka

IPC分类号： G01D5/38 ,  H01J3/14

CPC分类号： G01D5/38

摘要： An optical scale reader comprises a light source for radiating a beam of coherent light on a reflective scale, a half mirror for mixing light beams from the light source which are reflected and diffracted by the scale for interference with each other, an optical system for causing the interfering light beams leaving the half mirror on its opposite sides to be 90.degree. out of phase with each other so that the light beams will fall on the half mirror at a particular angle of incidence, photodetectors for detecting the interfering light beams, respectively, which have left the half mirror, and a signal processor for processing first and second electric signals which are supplied from the photodetectors and 90.degree. out of phase with each other to generate a signal indicative of the distance which the scale has moved. There is also disclosed a position control device incorporating the optical scale reader.

摘要翻译： 一种光学秤读取器，包括用于在反射比例尺上照射相干光束的光源，用于混合来自光源的光束的半反射镜，该反射镜被彼此反射和衍射的刻度尺相互干涉，用于引起 离开其相反侧的半反射镜的干涉光束彼此相差90°，使得光束以特定的入射角落在半反射镜上，分别用于检测干涉光束的光电检测器， 已经离开半反射镜的信号处理器和用于处理从光电检测器提供的第一和第二电信号并且彼此相差90°的信号处理器，以产生指示刻度尺移动的距离的信号。 还公开了一种结合光学刻度读取器的位置控制装置。

公开(公告)号：US5189309A

公开(公告)日：1993-02-23

申请号：US726802

申请日：1991-07-08

申请人： Morio Wada ,  Masahito Seko ,  Youichi Sekiguchi ,  Hideto Iwaoka

发明人： Morio Wada ,  Masahito Seko ,  Youichi Sekiguchi ,  Hideto Iwaoka

IPC分类号： H01L31/10 ,  H01L31/0304 ,  H01L31/105 ,  H01L31/18

CPC分类号： H01L31/03046 ,  H01L31/105 ,  H01L31/1844 ,  Y02E10/544

摘要： A photodiode having a GaInAs light-absorbing layer on an InP substrate which can reduce temperature dependence of the spectral responsivity as well as enable the optical power measurement with less dependence on the incident light spectral width by using a material with smaller composition ratio of Ga for the light-absorbing layer to extend the absorption edge toward the longer wavelengths.

公开(公告)号：US4772843A

公开(公告)日：1988-09-20

申请号：US56140

申请日：1987-05-29

申请人： Takao Asaka ,  Yuji Yamaguchi ,  Hideto Iwaoka

发明人： Takao Asaka ,  Yuji Yamaguchi ,  Hideto Iwaoka

IPC分类号： G04F10/10 ,  H02J15/00

CPC分类号： G04F10/105

摘要： In order to accurately measure time interval Tx from time t.sub.j to time t.sub.k, the pulse widths of a start interpolation pulse and a stop interpolation pulse must be measured accurately. The invention uses two time-to-voltage converters, one for the start interpolation pulse and the other for the stop interpolation pulse, to convert these pulses to corresponding voltage signals to thereby measure the pulse widths. These converters each comprises a high speed circuit which comprises a current switch, a capacitor, a constant current source and a diode. Advantageously, even though the start and stop interpolation pulses occur close to each other, the pulses can be measured accurately. Also, even though the pulses occur at short intervals, the time interval Tx can be measured accurately.

摘要翻译： 为了准确测量从时间tj到时间tk的时间间隔Tx，必须准确测量起始插补脉冲和停止插补脉冲的脉冲宽度。 本发明使用两个时间 - 电压转换器，一个用于起始内插脉冲，另一个用于停止内插脉冲，以将这些脉冲转换成相应的电压信号，从而测量脉冲宽度。 这些转换器各自包括高速电路，其包括电流开关，电容器，恒流源和二极管。 有利地，即使开始和停止插补脉冲彼此接近发生，可以精确地测量脉冲。 此外，即使脉冲以短间隔发生，也可以精确地测量时间间隔Tx。

公开(公告)号：US4716370A

公开(公告)日：1987-12-29

申请号：US778368

申请日：1985-09-20

申请人： Yuji Inoue ,  Hideto Iwaoka ,  Tadashi Sugiyama

发明人： Yuji Inoue ,  Hideto Iwaoka ,  Tadashi Sugiyama

IPC分类号： G01R33/20 ,  A61B5/055 ,  A61B10/00 ,  G01R33/381 ,  G01R33/3875 ,  H01F5/00 ,  H01F7/20

CPC分类号： H01F7/20 ,  G01R33/3875

摘要： A coil arrangement for producing a static magnetic field comprising a central coil and two outer coils disposed on opposite sides of the central coil. The positions and dimensions of the coils are so selected that each term contained in the Taylor series of the function of the magnetic field in the axial direction (z axis) of the coil arrangement in minimized. The current density in the central portion of the central coil is made to be higher than at other portions. The inventive coil arrangement is smaller in size, lighter in weight, and consumers a smaller amount of power than the prior art for the same magnetic strength and with a better homogeneous magnetic field.

摘要翻译： 一种用于产生静磁场的线圈装置，包括中心线圈和设置在中心线圈的相对侧上的两个外部线圈。 线圈的位置和尺寸如此选择，使得包含在线圈装置的轴向（z轴）上的磁场的函数的泰勒级数中的每个项目最小化。 使中心线圈的中心部分的电流密度高于其它部分的电流密度。 本发明的线圈装置的尺寸更小，重量更轻，并且对于相同的磁强度和更好的均匀的磁场，消耗了比现有技术更少的功率。

公开(公告)号：US4651097A

公开(公告)日：1987-03-17

申请号：US659409

申请日：1984-10-10

申请人： Hideto Iwaoka ,  Tadashi Sugiyama ,  Hiroyuki Matsuura

发明人： Hideto Iwaoka ,  Tadashi Sugiyama ,  Hiroyuki Matsuura

IPC分类号： G01R33/54 ,  G01R33/20

CPC分类号： G01R33/482

摘要： In an examination method and apparatus utilizing nuclear magnetic resonance, high frequency pulses for producing nuclear magnetic resonance are applied by successively imposing a first 90.degree. pulse, a first 180.degree. pulse, a second 90.degree. pulse, and a second 180.degree. pulse substantially immediately after the second 90.degree. pulse, and a next pulse sequence is initiated upon elapse of a wait time after the second 180.degree. pulse has been applied. The wait time is rendered much shorter than the conventional prior art wait times for high speed scanning operation, by forcibly aligning magnetization M first with the direction of a -Z direction axis and then with the direction of a +Z direction axis, using the second 90.degree. pulse and the second 180.degree. pulse. By applying a number of first 180.degree. pulses, a number of nuclear magentic resonance signals are produced for additionally shortening the overall measurement time.

摘要翻译： 在使用核磁共振的检查方法和装置中，通过依次施加第一个90°脉冲，第一个180°脉冲，第二个90°脉冲和第二个180°脉冲，基本上立即产生用于产生核磁共振的高频脉冲 在第二个90度脉冲之后，并且在施加第二个180度脉冲之后经过等待时间后开始下一个脉冲序列。 通过将磁化M首先与-Z方向轴的方向，然后与+ Z方向轴的方向强制对准，等待时间比传统现有技术的高速扫描操作等待时间短得多，使用第二个 90度脉冲和第二个180度脉冲。 通过应用多个第一180度脉冲，产生许多核磁共振信号以额外缩短整个测量时间。