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1. 发明专利

JP2002094280A ACTIVE SHIELDING DEVICE 失效
公开(公告)号：JP2002094280A
公开(公告)日：2002-03-29
申请号：JP2000281311
申请日：2000-09-18
申请人： MAGBANG KK , TAKENAKA KOMUTEN CO
发明人： MATSUBA HIRONORI , KATO KAZUO , YAMAZAKI KEITA
IPC分类号： G01R33/02 , A61B5/055 , G01R33/42 , H05K9/00
摘要： PROBLEM TO BE SOLVED: To provide an active shielding device that can obtain shielding performance over a wide frequency range even if the frequency of an external magnetic field is fluctuated, and at the same time prevents the shielding performance from easily deteriorating even if the position of the generation source of the external magnetic field changes. SOLUTION: When the external magnetic field is applied to a magnetic shielding body 3 made of a ferromagnetic material, magnetic sensors 5X, 5Y, and 5Z for detecting the size of a magnetic field merely in one direction are installed at a position (a center section on a wall surface) that can detect the synthetic magnetic field of the external magnetic field and the magnetic field due to the magnetization of the magnetic shielding body 3. Coils 6X1, 6X2, 6Y1, 6Y2, 6Z1, and 6Z2 are installed so that the magnetic field having the same direction as the magnetic-field detection direction of the magnetic sensor is generated. When the synthetic magnetic field detected by the magnetic sensor is changed, a controlling device 7 is provided, where the controlling device allows current for generating the magnetic field canceling the change to flow to the coils. In the controlling device 7, the relationship between the output of the magnetic sensor and the current that is allowed to flow to the coils is set so that the magnetic field at the center section in the magnetic shielding body is minimized.

2. 发明专利

JP2003294704A Magnetic material detecting device 审中-公开
标题翻译：磁性材料检测装置
公开(公告)号：JP2003294704A
公开(公告)日：2003-10-15
申请号：JP2002087638
申请日：2002-03-27
申请人： Ge Medical Systems Global Technology Co Llc , Magbang Kk , ジーイー・メディカル・システムズ・グローバル・テクノロジー・カンパニー・エルエルシー , マグバン株式会社
发明人： GOTO TAKAO , MATSUBA HIRONORI
IPC分类号： G01R33/02 , G01N27/72 , G01R33/04
摘要： PROBLEM TO BE SOLVED: To provide a magnetic material detecting device which does not require a special magnetic-field applying means and can detect even a small magnetic material.
SOLUTION: Two magnetic sensors 1A and 1B are arranged so as to sandwich therebetween a moving path P of a material J to be detected. Input signals Sa and Sb from the sensors 1A and 1B are computed in an arithmetic circuitry 3 so as to minimize an output signal to a magnetic noise. Then, a low frequency component is removed from an output signal Sc of the computing means 3 by a high pass filter 4, and, based on an output signal Sd of the high pass filter 4, a determining circuitry 5 determines whether or not the material J to be detected is a magnetic material.
COPYRIGHT: (C)2004,JPO
摘要翻译：要解决的问题：提供一种不需要特殊的磁场施加装置的磁性材料检测装置，甚至可以检测小的磁性材料。解决方案：两个磁传感器1A和1B布置成夹在其间待检测材料J的移动路径P。在运算电路3中计算来自传感器1A和1B的输入信号Sa和Sb，以使对于磁噪声的输出信号最小化。然后，通过高通滤波器4从计算装置3的输出信号Sc去除低频分量，并且基于高通滤波器4的输出信号Sd，确定电路5确定材料被检测的J是磁性材料。版权所有（C）2004，JPO

3. 发明专利

JP2001083223A MAGNETOMETER 失效
公开(公告)号：JP2001083223A
公开(公告)日：2001-03-30
申请号：JP29573199
申请日：1999-09-09
申请人： MAGBANG KK
发明人： MATSUBA HIRONORI
IPC分类号： G01C17/32 , G01R33/02
摘要： PROBLEM TO BE SOLVED: To obtain a high sensitivity magnetometer through a simple arrangement by detecting the phase difference between the oscillation waveform of an oscillator for exciting a resonance circuit and an waveform resonant to the resonance circuit. SOLUTION: The magnetometer has a resonance circuit 1 comprising a coil wound around a ferromagnetic, and a capacitor connected in series therewith. An AC high frequency power supply 3 (oscillator) having a frequency close to a resonance frequency for exciting the resonance circuit 1, a phase difference detection circuit 4 and a bias current source 2 for applying a bias field to the ferromagnetic are also provided. The AC high frequency power supply 3 excites the resonance circuit 1 and the phase difference detection circuit 4 detects the phase difference between the oscillation voltage waveform and the AC current waveform of the high frequency power supply 3 thus detecting variation of external field sensitively as the variation of inductance of the coil. Noise due to amplitude variation of the high frequency power supply 3 does not exist.

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