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公开(公告)号：US11644517B2
公开(公告)日：2023-05-09
申请号：US17569194
申请日：2022-01-05
Applicant: TDK CORPORATION
Inventor： Kei Tanabe
CPC classification number: G01R33/09 , G01B7/003 , G01R33/0005 , G01R33/02 , H01L43/08
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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公开(公告)号：US10168395B2
公开(公告)日：2019-01-01
申请号：US15069462
申请日：2016-03-14
Applicant: TDK CORPORATION
Inventor： Kei Tanabe
IPC: G01R33/09
Abstract: The present invention relates to a magnetic sensor which can improve the detection precision of a weak magnetic field. A magnetic sensor wherein a magnetic body which changes the direction of a magnetic field input to a magnetoresistance effect element is provided in the vicinity of the magnetoresistance effect element in which the resistance value changes according to the direction of the input magnetic field, and the magnetic body has a recess with a concave shape on the surface at a side where the magnetoresistance effect element is formed. The center of the recess may be substantially identical to that of the magnetic body. The concave shape may at least include polygon having three or more sides, or may at least include arc.
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公开(公告)号：US11199593B2
公开(公告)日：2021-12-14
申请号：US16603636
申请日：2018-04-06
Applicant: TDK Corporation
Inventor： Kei Tanabe , Akihiro Unno
Abstract: A magnetic sensor suppressing bias magnetic field effects includes a magnetic detecting unit including first to fourth magneto-resistive elements to which a first magnetic field to be detected is applied, a differential amplifier into which the output voltage of the magnetic detecting unit is input, a first magnetic field generating conductor which, by a first feedback current output by the differential amplifier, applies to the magnetic detecting unit a second magnetic field to cancel the first magnetic field detected by the magnetic detecting unit, a bias magnetic field detector which detects a bias magnetic field applied to the magnetic detecting unit and outputs a second feedback current corresponding to the bias magnetic field, and a second magnetic field generating conductor which, by the second negative feedback current, applies to the magnetic detecting unit a correcting magnetic field to cancel the bias magnetic field detected by the magnetic detecting unit.
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公开(公告)号：US10247790B2
公开(公告)日：2019-04-02
申请号：US15069189
申请日：2016-03-14
Applicant: TDK CORPORATION
Inventor： Kei Tanabe
Abstract: The present invention relates to a magnetic sensor which can detect a weak magenetic field and improve the detection precision with an easy and convenient configuration. A magnetic sensor is provided with a magnetic body changing the direction of a magnetic field input to a magnetoresistance effect element in the vicinity of the magnetoresistance effect element in which the resistance value changes according to the direction of the input magnetic field, the magnetic body has at leas one projection portion in the direction almost parallel to direction in which the magnetic induction occurs in the magnetoresistance effect element. The direction in which the projection portion of the magnetic body projects is substantially parallel to the direction in which the magnetization of the magnetoresistance effect element is fixed.
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公开(公告)号：US11927648B2
公开(公告)日：2024-03-12
申请号：US18130100
申请日：2023-04-03
Applicant: TDK CORPORATION
Inventor： Kei Tanabe
CPC classification number: G01R33/09 , G01B7/003 , G01R33/0005 , G01R33/02 , 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：US10101413B2
公开(公告)日：2018-10-16
申请号：US14528231
申请日：2014-10-30
Applicant: TDK CORPORATION
Inventor： Tamon Kasajima , Kei Tanabe , Akihiro Ogawa
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.
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公开(公告)号：US11898980B2
公开(公告)日：2024-02-13
申请号：US17312292
申请日：2019-09-24
Applicant: TDK Corporation
Inventor： Kei Tanabe
IPC: G01N27/18
CPC classification number: G01N27/18
Abstract: A gas sensor includes a feedback circuit part and a sensor circuit part. The feedback circuit part includes a reference resistor and a first temperature sensing element which are connected in series, a first heater resistor that heats the first temperature sensing element, and a first amplifier circuit that controls the amount of current to flow in the first heater resistor based on an internal potential. The sensor circuit part includes a second temperature sensing element and a second heater resistor that heats the second temperature sensing element. A current according to the output of the first amplifier circuit flows in the second heater resistor. With this configuration, it is possible to automatically change the amount of current to flow in the second heater resistor according to ambient temperature without digital processing to thereby heat the second temperature sensing element to a constant temperature.
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公开(公告)号：US11703491B2
公开(公告)日：2023-07-18
申请号：US17360063
申请日：2021-06-28
Applicant: TDK Corporation
Inventor： Kei Tanabe
CPC classification number: G01N33/004 , H05K5/0026
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：US11249149B2
公开(公告)日：2022-02-15
申请号：US16079944
申请日：2016-10-20
Applicant: TDK CORPORATION
Inventor： Kei Tanabe
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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公开(公告)号：US09983273B2
公开(公告)日：2018-05-29
申请号：US14712374
申请日：2015-05-14
Applicant: TDK CORPORATION
Inventor： Akihiro Ogawa , Tamon Kasajima , Kei Tanabe
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.
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