公开(公告)号：US20240230798A1

公开(公告)日：2024-07-11

申请号：US18610999

申请日：2024-03-20

Applicant: TDK Corporation

Inventor： Yuta SAITO ,  Hiraku HIRABAYASHI ,  Yoshihiro KUDO

IPC: G01R33/09

CPC classification number: G01R33/093 ,  G01R33/098

Abstract: A magnetic sensor includes a magnetic sensor chip that includes a magnetoresistive effect element and a sealed part. The magnetoresistive effect element includes a free layer and a pinned layer. The sealed part has a first surface and a second surface, which is opposite the first surface. The shape of the sealed part in the plan view from the first surface side is substantially quadrilateral. The substantially quadrilateral shape has a first side and a second side, which are substantially parallel to each other. In the plan view, from the first surface side of the sealed part, the magnetization direction of the pinned layer, in a state in which the external magnetic field is not applied on the magnetoresistive effect element, is inclined with respect to an approximately straight line found through the least squares method using a plurality of points arbitrarily set on the first side.

公开(公告)号：US20220326320A1

公开(公告)日：2022-10-13

申请号：US17850391

申请日：2022-06-27

Applicant: TDK Corporation

Inventor： Yuta SAITO ,  Hiraku HIRABAYASHI ,  Yoshihiro KUDO

IPC: G01R33/09

Abstract: A magnetic sensor includes a magnetic sensor chip that includes a magnetoresistive effect element and a sealed part. The magnetoresistive effect element includes a free layer and a pinned layer. The sealed part has a first surface and a second surface, which is opposite the first surface. The shape of the sealed part in the plan view from the first surface side is substantially quadrilateral. The substantially quadrilateral shape has a first side and a second side, which are substantially parallel to each other. In the plan view, from the first surface side of the sealed part, the magnetization direction of the pinned layer, in a state in which the external magnetic field is not applied on the magnetoresistive effect element, is inclined with respect to an approximately straight line found through the least squares method using a plurality of points arbitrarily set on the first side.

公开(公告)号：US20220317210A1

公开(公告)日：2022-10-06

申请号：US17847694

申请日：2022-06-23

Applicant: TDK Corporation

Inventor： Yuta SAITO ,  Yoshihiro KUDO ,  Daisuke MIYAUCHI ,  Satoshi ABE

IPC: G01R33/09 ,  G01R1/20 ,  G01R15/20

Abstract: The current sensor comprises: a magnetic detecting device that is arranged in the vicinity of a conductor, to which a magnetic field to be measured induced by a current flowing through the conductor is applied, and that changes an electrical resistance in response to a change in the magnetic field to be measured; two coils that generate a canceling magnetic field to cancel the magnetic field to be measured and that are arranged in the vicinity of the magnetic detecting device; a shunt resistor, that is connected in series between the two coils, for detecting a current flowing through the coils; a first differential amplifier that amplifies the output signal of the magnetic detecting device and that supplies the current to induce the canceling magnetic field to the coils; and a second differential amplifier that amplifies the voltage across the shunt resistor and that outputs a measured voltage proportional to the current flowing through the conductor.

公开(公告)号：US20230243899A1

公开(公告)日：2023-08-03

申请号：US18299475

申请日：2023-04-12

Applicant: TDK Corporation

Inventor： Yuta SAITO ,  Hiraku HIRABAYASHI ,  Yoshihiro KUDO

IPC: G01R33/09

CPC classification number: G01R33/093 ,  G01R33/098

Abstract: A magnetic sensor includes a magnetic sensor chip that includes a magnetoresistive effect element and a sealed part. The magnetoresistive effect element includes a free layer and a pinned layer. The sealed part has a first surface and a second surface, which is opposite the first surface. The shape of the sealed part in the plan view from the first surface side is substantially quadrilateral. The substantially quadrilateral shape has a first side and a second side, which are substantially parallel to each other. In the plan view, from the first surface side of the sealed part, the magnetization direction of the pinned layer, in a state in which the external magnetic field is not applied on the magnetoresistive effect element, is inclined with respect to an approximately straight line found through the least squares method using a plurality of points arbitrarily set on the first side.

公开(公告)号：US20210239774A1

公开(公告)日：2021-08-05

申请号：US17155307

申请日：2021-01-22

Applicant: TDK Corporation

Inventor： Yuta SAITO ,  Yoshihiro KUDO ,  Daisuke MIYAUCHI ,  Satoshi ABE

IPC: G01R33/09 ,  G01R15/20 ,  G01R1/20

Abstract: The current sensor comprises: a magnetic detecting device that is arranged in the vicinity of a conductor, to which a magnetic field to be measured induced by a current flowing through the conductor is applied, and that changes an electrical resistance in response to a change in the magnetic field to be measured; two coils that generate a canceling magnetic field to cancel the magnetic field to be measured and that are arranged in the vicinity of the magnetic detecting device; a shunt resistor, that is connected in series between the two coils, for detecting a current flowing through the coils; a first differential amplifier that amplifies the output signal of the magnetic detecting device and that supplies the current to induce the canceling magnetic field to the coils; and a second differential amplifier that amplifies the voltage across the shunt resistor and that outputs a measured voltage proportional to the current flowing through the conductor.

公开(公告)号：US20150054498A1

公开(公告)日：2015-02-26

申请号：US14335248

申请日：2014-07-18

Applicant: TDK CORPORATION

Inventor： Yoshimitsu WADA ,  Nozomu HACHISUKA ,  Yoshihiro KUDO ,  Jun ONO ,  Nobutaka NISHIO

IPC: G01R33/09

CPC classification number: G01R33/098 ,  G01R33/091

Abstract: The magnetic sensor of the invention comprises a base portion, a sensor chip positioned on the base portion, a wiring portion adapted to electrically connect a terminal of the sensor chip to a connecting lead, a resin having a low elastic modulus for coating at least the sensor chip, and a resin having a high elastic modulus for coating at least the low elastic-modulus resin and the wiring portion, wherein the sensor chip includes a magneto-resistive effect device, and the low elastic-modulus resin has an elastic modulus ranging from 10 kPa to 80 MPa while the high elastic-modulus resin has an elastic modulus of 1 GPa or more, and enables the sensor chip to perform well in a good state although having a structure of sealing up the sensor chip with the resin member.

Abstract translation: 本发明的磁传感器包括基座部分，位于基座部分上的传感器芯片，适于将传感器芯片的端子与连接引线电连接的布线部分，具有低弹性模量的树脂至少涂覆 传感器芯片和具有高弹性模量的树脂，用于至少涂覆低弹性模量树脂和布线部分，其中传感器芯片包括磁阻效应器件，并且低弹性模量树脂具有弹性模量范围 10psi〜80MPa，高弹性模量树脂的弹性模量为1GPa以上，能够使传感器芯片在良好的状态下良好地进行良好的动作，同时具有利用树脂部件密封传感器芯片的结构。