公开(公告)号：US20210156933A1

公开(公告)日：2021-05-27

申请号：US17084376

申请日：2020-10-29

Applicant: TDK CORPORATION

Inventor： Kenzo MAKINO ,  Norikazu OTA

IPC: G01R33/09 ,  H01F7/20

Abstract: A magnetic sensor includes at least one MR element and a coil. The coil includes at least one conductor portion. The at least one conductor portion is each located at a position such that a partial magnetic field generated by the conductor portion is applied to one of the at least one MR element, the one corresponding to the conductor portion, and extends along an imaginary curve curving to protrude in a direction away from the corresponding MR element.

公开(公告)号：US20210018337A1

公开(公告)日：2021-01-21

申请号：US17064873

申请日：2020-10-07

Applicant: TDK CORPORATION

Inventor： Kenzo MAKINO ,  Tsuyoshi UMEHARA

IPC: G01D5/16

Abstract: A magnetic sensor generates a detection signal that varies according to the strength of a target magnetic field at a detection position in a reference plane. The magnetic sensor includes a magnetoresistive element. The magnetoresistive element includes a magnetization pinned layer having a magnetization in a first direction, and a free layer having a magnetization whose direction is variable according to the direction of an acting magnetic field, the acting magnetic field being a composite magnetic field of all magnetic fields acting on the free layer. The free layer has uniaxial magnetic anisotropy such that an easy axis of magnetization is oriented in a direction parallel to a second direction. In the reference plane, both of two directions orthogonal to the second direction are different from the direction of the target magnetic field.

公开(公告)号：US20200292630A1

公开(公告)日：2020-09-17

申请号：US16798796

申请日：2020-02-24

Applicant: TDK Corporation

Inventor： Kenzo MAKINO

IPC: G01R33/00 ,  H01F27/34 ,  G01R33/09

Abstract: A magnet flux absorber of the present invention has a soft magnetic layer having a first surface and a second surface that is a back surface of the first surface, as well as and at least one magnetically pinning portion that faces a part of the first surface of the soft magnetic layer or a part of the second surface of the soft magnetic layer. A region of the soft magnetic layer that faces the magnetically pinning portion is magnetized by the magnetically pinning portion in a direction that is different from a direction in which at least a part of remaining region of the soft magnetic layer is magnetized.

公开(公告)号：US20240110951A1

公开(公告)日：2024-04-04

申请号：US18538546

申请日：2023-12-13

Applicant: TDK CORPORATION

Inventor： Takafumi KOBAYASHI ,  Norikazu OTA ,  Kenzo MAKINO

IPC: G01R15/20 ,  G01R19/00 ,  G01R33/09

CPC classification number: G01R15/205 ,  G01R19/0092 ,  G01R33/09

Abstract: A magnetic field detection apparatus includes a magnetoresistive effect element and a coil. The coil includes first and second tier parts opposed to each other in a first axis direction, with the magnetoresistive effect element interposed therebetween. The coil is configured to be supplied with a current and thereby configured to generate an induction magnetic field to be applied to the magnetoresistive effect element in a second axis direction. The first tier part includes first conductors extending in a third axis direction, arranged in the second axis direction and coupled in parallel to each other. The second tier part includes a second conductor or second conductors extending in the third axis direction, the second conductors being arranged in the second axis direction and coupled in parallel to each other. The first conductors each have a width smaller than a width of the second conductor or each of the second conductors.

公开(公告)号：US20240094315A1

公开(公告)日：2024-03-21

申请号：US18517863

申请日：2023-11-22

Applicant: TDK CORPORATION

Inventor： Hirokazu TAKAHASHI ,  Kenzo MAKINO

IPC: G01R33/09

CPC classification number: G01R33/098 ,  G01R33/093

Abstract: A magnetic sensor includes an MR element. The MR element includes a free layer. The free layer has a first surface having a shape that is long in one direction and a second surface located opposite the first surface, and has a thickness that is a dimension in a direction perpendicular to the first surface. The first surface has a first edge and a second edge located at both lateral ends of the first surface. In a given cross section, the thickness at the first edge is smaller than the thickness at a predetermined point on the first surface between the first edge and the second edge.

公开(公告)号：US20230341484A1

公开(公告)日：2023-10-26

申请号：US18339666

申请日：2023-06-22

Applicant: TDK CORPORATION

Inventor： Hirokazu TAKAHASHI ,  Kenzo MAKINO

IPC: G01R33/09

CPC classification number: G01R33/093 ,  G01R33/098 ,  G01R33/096

Abstract: A magnetic sensor includes an MR element and a support member. The support member has an opposed surface including a first inclined portion, and a bottom surface. In a given cross section, the first inclined portion is inclined at a first angle at a first position, and inclined at a second angle smaller than the first angle at a second position. The absolute value of a curvature of the first inclined portion at the first position is less than the absolute value of the curvature of the first inclined portion at the second position. The MR element is provided on the first inclined portion so that the first edge is located above the first position in a given cross section.

公开(公告)号：US20220373620A1

公开(公告)日：2022-11-24

申请号：US17881666

申请日：2022-08-05

Applicant: TDK CORPORATION

Inventor： Kenzo MAKINO ,  Norikazu OTA

IPC: G01R33/09

Abstract: A magnetic sensor includes at least one MR element and a coil. The coil includes at least one conductor portion. The at least one conductor portion is each located at a position such that a partial magnetic field generated by the conductor portion is applied to one of the at least one MR element, the one corresponding to the conductor portion, and extends along an imaginary curve curving to protrude in a direction away from the corresponding MR element.

公开(公告)号：US20210293857A1

公开(公告)日：2021-09-23

申请号：US17187966

申请日：2021-03-01

Applicant: TDK CORPORATION

Inventor： Takafumi KOBAYASHI ,  Norikazu OTA ,  Kenzo MAKINO

IPC: G01R15/20 ,  G01R33/09 ,  G01R19/00

Abstract: A magnetic field detection apparatus includes a magnetoresistive effect element and a coil. The coil includes first and second tier parts opposed to each other in a first axis direction, with the magnetoresistive effect element interposed therebetween. The coil is configured to be supplied with a current and thereby configured to generate an induction magnetic field to be applied to the magnetoresistive effect element in a second axis direction. The first tier part includes first conductors extending in a third axis direction, arranged in the second axis direction and coupled in parallel to each other. The second tier part includes a second conductor or second conductors extending in the third axis direction, the second conductors being arranged in the second axis direction and coupled in parallel to each other. The first conductors each have a width smaller than a width of the second conductor or each of the second conductors.

公开(公告)号：US20210181240A1

公开(公告)日：2021-06-17

申请号：US17080958

申请日：2020-10-27

Applicant: TDK CORPORATION

Inventor： Norikazu OTA ,  Kenzo MAKINO ,  Hiraku HIRABAYASHI

IPC: G01R15/20 ,  G01R33/09

Abstract: A magnetic field detection apparatus includes a magnetoresistive effect element and a helical coil. The magnetoresistive effect element includes a magnetoresistive effect film extending in a first axis direction. The helical coil includes a parallel connection including first and second parts extending in a second axis direction inclined with respect to the first axis direction. The first and second parts are adjacent to each other in a third axis direction and coupled to each other in parallel. The helical coil is wound around the magnetoresistive effect element while extending along the third axis direction. The magnetoresistive effect film overlaps the first and second parts in a fourth axis direction orthogonal to the second and third axis directions. The helical coil is configured to be supplied with a current and thereby configured to generate an induction magnetic field to be applied to the magnetoresistive effect film in the third axis direction.

公开(公告)号：US20190056459A1

公开(公告)日：2019-02-21

申请号：US16028632

申请日：2018-07-06

Applicant: TDK CORPORATION

Inventor： Keisuke UCHIDA ,  Kenzo MAKINO

IPC: G01R33/05

Abstract: A magnetic sensor includes a magnetic field conversion unit, a magnetic field detection unit, and a magnetic film. The magnetic field conversion unit includes a yoke that receives an input magnetic field and generates an output magnetic field. The input magnetic field contains an input magnetic field component in a direction parallel to Z direction. The output magnetic field contains an output magnetic field component in a direction parallel to X direction. The magnetic field detection unit includes a magnetic detection element that receives the output magnetic field and generates a detection value corresponding to the output magnetic field component. The magnetic film absorbs part of magnetic flux resulting from a noise magnetic field, which is a magnetic field in a direction to which the magnetic detection element has sensitivity and which is other than the output magnetic field component.