公开(公告)号：US20150115938A1

公开(公告)日：2015-04-30

申请号：US14528231

申请日：2014-10-30

Applicant: TDK CORPORATION

Inventor： Tamon KASAJIMA ,  Kei TANABE ,  Akihiro OGAWA

IPC: G01D5/22 ,  G01R33/09

CPC classification number: G01R33/09 ,  G01R33/0041

Abstract: A magnetic field detection device includes: a first magnetic field generating part, including a first magnetic field generating conductor; a first magnetic field detection part, including a first magnetic field detection element and a first differential operation part, wherein a first output of the first magnetic field detection element corresponding to the environment magnetic field is inputted into the first differential operation part, and a first feedback current flows into the first magnetic field generating conductor, and thus the first magnetic field generating part provides the first magnetic field detection element with a first feedback current magnetic field, with a direction opposite to the environment magnetic field; a second magnetic field generating part, including a second magnetic field generating conductor, in which a second current corresponding to the first feedback current flows; and a second magnetic field detection part, including a second magnetic field detection element.

Abstract translation: 磁场检测装置包括：第一磁场产生部，包括第一磁场产生导体; 第一磁场检测部，其包括第一磁场检测元件和第一差分运算部，其中与所述环境磁场对应的所述第一磁场检测元件的第一输出被输入到所述第一差分运算部， 反馈电流流入第一磁场产生导体，因此第一磁场产生部分向第一磁场检测元件提供具有与环境磁场相反的方向的第一反馈电流磁场; 第二磁场产生部分，包括第二磁场产生导体，其中对应于第一反馈电流的第二电流流动; 以及包括第二磁场检测元件的第二磁场检测部。

公开(公告)号：US20230118663A1

公开(公告)日：2023-04-20

申请号：US17966061

申请日：2022-10-14

Applicant: TDK Corporation

Inventor： Yuichiro YAMAJI ,  Tamon KASAJIMA ,  Taiju AKUSHICHI

IPC: G01R33/09 ,  G01R33/00

Abstract: Disclosed herein is a magnetic sensor that includes a first magnetic field sensor that detects an environmental magnetic field to generate a first magnetic field signal, a second magnetic field sensor that detects a detection target magnetic field to generate a second magnetic field signal, a first filter that removes an AC component in a predetermined frequency band from the first magnetic field signal to extract a DC component, a first compensation coil that applies a first cancelling magnetic field to the second magnetic field sensor based on the DC component, a second compensation coil that applies a second cancelling magnetic field to the second magnetic field sensor based on the second magnetic field signal, and a second filter that removes an AC component in at least a predetermined frequency band from the second magnetic field signal.

公开(公告)号：US20220349960A1

公开(公告)日：2022-11-03

申请号：US17778249

申请日：2020-07-30

Applicant: TDK Corporation

Inventor： Taiju AKUSHICHI ,  Makoto KAMENO ,  Tamon KASAJIMA

IPC: G01R33/025 ,  G01R33/09

Abstract: To provide a small-sized magnetic sensor capable of achieving closed-loop control. A magnetic sensor includes: a sensor chip mounted on a surface of a substrate such that an element formation surface is perpendicular to the surface of the substrate or inclined by a predetermined angle with respect thereto; an external magnetic member mounted on the surface of the substrate and collecting a magnetic field to be detected in a magnetosensitive element; and a compensating coil wound around the external magnetic member. The compensating coil is thus wound around the external magnetic member, so that it is possible to cancel a magnetic field to be applied to the magnetosensitive element and to prevent the external magnetic member from being magnetically saturated.

公开(公告)号：US20150331072A1

公开(公告)日：2015-11-19

申请号：US14712374

申请日：2015-05-14

Applicant: TDK CORPORATION

Inventor： Akihiro OGAWA ,  Tamon KASAJIMA ,  Kei TANABE

IPC: G01R33/12

CPC classification number: G01R33/09 ,  G01R33/1253

Abstract: A magnetic field detecting sensor includes a bridge circuit which is connected to multiple magnetoresistive effect elements and is capable of outputting a differential voltage between specified connection points, a magnetic field generating conductor for providing the magnetoresistive effect elements with a magnetic field in a direction opposite to that of the detection magnetic field by disposing a magnetic body near the center of the bridge circuit, a differential operation circuit which the differential voltage is input in and makes a feedback current flow to the magnetic field generating conductor, wherein the feedback current generates the magnetic field in a direction opposite to that of the detection magnetic field in the magnetic field generating conductor, and a voltage converting circuit for outputting the feedback current as a voltage value. The magnetic field generating conductor and the magnetoresistive effect elements are formed in the same stacked body.

Abstract translation: 磁场检测传感器包括连接到多个磁阻效应元件并能够输出指定连接点之间的差分电压的桥接电路，用于向磁阻效应元件提供磁场的磁场产生导体，该磁场产生导体沿与 通过将磁体配置在桥接电路的中心附近的检测磁场的位置，输入差分电压并使反馈电流流向磁场产生导体的差分运算电路，其中反馈电流产生磁场 在与磁场产生导体中的检测磁场的方向相反的方向上设置电场，以及电压转换电路，用于输出反馈电流作为电压值。 磁场产生导体和磁阻效应元件形成在相同的层叠体中。

公开(公告)号：US20240248156A1

公开(公告)日：2024-07-25

申请号：US18566578

申请日：2022-05-31

Applicant: TDK Corporation ,  National University Corporation YOKOHAMA National University

Inventor： Tamon KASAJIMA ,  Shuichi OKAWA ,  Masanori KOSUDA ,  Yasushi TAKEMURA ,  Bagus Trisnanto Suko

IPC: G01R33/06 ,  G01R33/12

CPC classification number: G01R33/06 ,  G01R33/1276

Abstract: A magnetic field measurement device includes: an excitation coil that applies an excitation AC magnetic field to an object to be measured including a magnetic material to make a magnetization change of the magnetic material exhibit linear response; a detection coil that detects a primary detection magnetic field caused due to the magnetization change of the magnetic material to generate a primary detection signal; a magnetic field generation coil that generates a secondary detection magnetic field based on the primary detection signal; and a magnetic sensor that detects the secondary detection magnetic field to generate a secondary detection signal including a non-sine wave component. With this configuration, it is possible to obtain the secondary detection signal including a non-sine wave component without making the magnetization change of the magnetic material exhibit nonlinear response, allowing reduction in the current value and frequency of a current flowing in the excitation coil.

公开(公告)号：US20240151785A1

公开(公告)日：2024-05-09

申请号：US18549713

申请日：2022-02-24

Applicant: TDK Corporation

Inventor： Taiju AKUSHICHI ,  Tamon KASAJIMA

IPC: G01R33/09

CPC classification number: G01R33/091

Abstract: To provide a magnetic sensor capable of detecting a weak magnetic field at a position situated apart from a magnetic field source. A magnetic sensor includes magnetic bodies whose magnetic collecting surfaces face mutually opposite sides and a magnetic detecting part 30 that detects magnetic flux passing between the magnetic bodies. With this configuration, magnetic flux collected from one magnetic collecting surface of one magnetic body passes to another magnetic collecting surface of another magnetic body through the magnetic detecting part, thereby making it possible to efficiently collect a magnetic field spreading in a space. Thus, even when a distance from a magnetic field source is large, magnetic collection can be achieved with high uniformity of a magnetic field.

公开(公告)号：US20200100363A1

公开(公告)日：2020-03-26

申请号：US16494809

申请日：2018-03-16

Applicant: TDK Corporation

Inventor： Masafumi KAMI ,  Hiroshi KOBAYASHI ,  Tamon KASAJIMA

IPC: H05K1/18 ,  H01M2/02 ,  H05K1/11

Abstract: A state detecting device which can be applied even in a severe environment. The state detecting device includes a chargeable all-solid-state battery, a piezoelectric element which supplies charging power to the all-solid-state battery, and an integrated circuit including various sensors which operate with electric power supplied from the all-solid-state battery. The all-solid-state battery, the piezoelectric element, and the integrated circuit are mounted on one surface of a flexible substrate. The flexible substrate is attached to a flexible object which is either an object to be measured or constitutes at least part of an inner surface of a space to be measured.

公开(公告)号：US20230204686A1

公开(公告)日：2023-06-29

申请号：US17927134

申请日：2021-05-10

Applicant: TDK Corporation

Inventor： Takato FUKUI ,  Tamon KASAJIMA ,  Yuichiro YAMAJI ,  Taiju AKUSHICHI ,  Osamu HARAKAWA ,  Makoto KAMENO

IPC: G01R33/00 ,  G01R33/09

CPC classification number: G01R33/0041 ,  G01R33/091

Abstract: To reduce the number of components and simplify the circuit configuration in a magnetic field detection device capable of detecting a weak magnetic field without using a shield room. A magnetic field detection device includes a cancel coil wound around a winding core part of a bobbin, magnetic sensors fixed to mutually different positions of the bobbin, and a feedback circuit that makes a cancel current flow in the cancel coil according to an output signal from the magnetic sensor to cancel the environmental magnetic field in a cancel space. Since the cancel coil is used in common for the magnetic sensors, it is possible to reduce the number of components to be used and to simplify the circuit configuration.

公开(公告)号：US20230176145A1

公开(公告)日：2023-06-08

申请号：US17928852

申请日：2021-05-27

Applicant: TDK Corporation

Inventor： Makoto KAMENO ,  Taiju AKUSHICHI ,  Takato FUKUI ,  Yuichiro YAMAJI ,  Osamu HARAKAWA ,  Tamon KASAJIMA

IPC: G01R33/025 ,  G01R33/09

CPC classification number: G01R33/025 ,  G01R33/09

Abstract: To facilitate a change in the number and layout of magnetic field detection devices to be arranged in an array. A magnetic field detection device includes a cancel coil wound around a bobbin, a cover member fixed to the bobbin and covering the cancel coil in a direction perpendicular to the axial direction of the cancel coil, and magnetic sensors fixed to the bobbin or cover member. The cover member has side surfaces and extending in the z-direction and positioned on mutually opposite sides. The side surfaces have first and second engagement portions, respectively, and the first engagement portion has a shape engageable with the shape of the second engagement portion. This makes it possible to arrange a desired number of the magnetic field detection devices.