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公开(公告)号：US20230258746A1
公开(公告)日：2023-08-17
申请号：US18130100
申请日：2023-04-03
Applicant: TDK CORPORATION
Inventor： Kei TANABE
CPC classification number: G01R33/09 , G01B7/003 , G01R33/02 , G01R33/0005 , H10N50/10
Abstract: An object of the present invention is to provide a magnetic sensor less subject to an environmental magnetic field. A magnetic sensor includes magnetic detection elements MR1 to MR4 positioned on a first plane P1 and a magnetic member 30A provided on a second plane P2. The magnetic member 30A includes first and second leg parts 41 and 42 and a first main body part 51 positioned between the first and second leg parts 41 and 42 so as to form a first space 61 between itself and the second plane P2. The magnetic detection elements MR1 to MR4 are covered with the first main body part 51. According to the present invention, magnetic field to be detected is collected to the first and second leg parts 41 and 42, and the magnetic detection elements MR1 to MR4 are covered with the first main body part 51, thereby allowing an environmental magnetic field acting as noise to bypass the magnetic detection elements MR1 to MR4 through the first main body part 51. Thus, influence of the environmental magnetic field can be reduced.
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Patent Agency Ranking
公开(公告)号：US20220018819A1
公开(公告)日：2022-01-20
申请号：US17360063
申请日：2021-06-28
Applicant: TDK Corporation
Inventor： Kei TANABE
Abstract: Disclosed herein is a sensor module that includes a substrate having a top surface and a back surface, a sensor element mounted on the top surface of the substrate, an external terminal formed on the back surface of the substrate, and a case fixed to the substrate so as to cover the sensor element. The case has a top plate part having a plurality of through holes. The top plate part has a center area having no through holes and a through hole formation area having the plurality of through holes, the through hole formation area being positioned so as to surround the center area.
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公开(公告)号：US20210003642A1
公开(公告)日：2021-01-07
申请号：US16613671
申请日：2018-05-14
Applicant: TDK Corporation
Inventor： Kei TANABE
Abstract: To provide a magnetic sensor capable of supporting a magnetic block stably and allowing a further size reduction of the sensor chip. A magnetic sensor includes a sensor chip and a magnetic block which are mounted on a circuit board. The sensor chip is mounted on the circuit board such that a mounted surface thereof faces a mounting surface, and the magnetic block is mounted on the circuit board such that first and second surfaces and face an element formation surface and the mounting surface, respectively. The magnetic block has a cutout portion, and some of terminal electrodes E11 to E16 are disposed within a space formed by the cutout portion. According to the present invention, the magnetic block can be supported stably. In addition, the presence of the cutout portion in the magnetic block allows a further size reduction of the sensor chip.
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公开(公告)号：US20200300936A1
公开(公告)日：2020-09-24
申请号：US16085706
申请日：2016-10-20
Applicant: TDK CORPORATION
Inventor： Kei TANABE
Abstract: An object of the present invention is to reduce the size and cost of a magnetic sensor suitable for closed loop control. A magnetic sensor includes a magnetoresistive effect element MR1 electrically connected between terminals 41 and 42 and extending in the x-direction and a magnetic member 31 electrically connected between terminal and 44 and extending in the x-direction along the magnetoresistive effect element MR1. The magnetoresistive effect element MR1 is disposed offset with respect to the center position of the magnetic member 31 in the y-direction. According to the present invention, magnetic flux to be detected is collected by the magnetic member 31, and current is made to flow in the magnetic member 31 in accordance with the resistance value of the magnetoresistive effect element MR1, whereby closed loop control can be achieved. That is, the magnetic member 31 has both a magnetism collection function and a function as a cancel coil, thereby reducing the number of elements required, which achieves reduction in size and cost.
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公开(公告)号：US20180321332A1
公开(公告)日：2018-11-08
申请号：US15770195
申请日：2016-10-20
Applicant: TDK CORPORATION
Inventor： Kei TANABE
CPC classification number: G01R33/091 , A61B5/05 , G01R33/0023 , G01R33/025 , G01R33/09 , G01R33/093 , G01R33/095
Abstract: An object of the present invention is to selectively detect a detection magnetic field without separately providing a sensor for detecting an environmental magnetic field. A magnetic field detection device includes a magnetic field detection unit 10 that generates an output signal S1 according to a magnetic field, a first signal generation unit 20 that extracts a predetermined frequency component from the output signal S1 and generates a cancel signal S2 based on the predetermined frequency component, a first magnetic field generation unit 40 that applies a first cancel magnetic field to the magnetic field detection unit 10 based on the cancel signal S2, and a second signal generation unit 30 that generates a detection signal S3 based on the output signal S1 of the magnetic field detection unit 10 to which the first cancel magnetic field is applied. According to the present invention, a cancel signal is generated based on a frequency component of an output signal, and a first cancel magnetic field is applied to a magnetic field detection unit using the cancel signal. Therefore, it is not necessary to separately provide a sensor for detecting an environmental magnetic field. Because this configuration reduces the number of parts, downsizing and cost reduction can be realized.
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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
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。
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