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

IPC: G01R33/09 ,  G01R33/00

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.

公开(公告)号：US11022659B2

公开(公告)日：2021-06-01

申请号：US15776234

申请日：2016-10-20

Applicant: TDK CORPORATION

Inventor： Yuki Asazuma ,  Kei Tanabe ,  Akihiro Unno ,  Atsushi Matsuda ,  Masashi Takahashi

IPC: G01R33/09 ,  H01L43/08 ,  G01R33/00 ,  G01R33/025

Abstract: An object of the present invention is to provide a magnetic sensor that can reduce influences of a disturbance magnetic field while ensuring high detection sensitivity. The magnetic sensor includes a sensor chip 20 having an element formation surface 20S on which magnetic detection elements MR3, MR4 are formed, a first magnetic member 31 placed on the element formation surface 20S and having a first height H1 as a height from the element formation surface 20S, and a second magnetic member 32 located on an opposite side of the magnetic detection elements MR3, MR4 to the first magnetic member 31 and having a second height H2 lower than the first height H1. According to the present invention, because the height H2 of the second magnetic member 32 is lower than that of the first magnetic member 31, a detection magnetic field attracted to the second magnetic member 32 can be reduced while a disturbance magnetic field is shielded by the second magnetic member 32. Accordingly, influences of the disturbance magnetic field can be reduced while high detection sensitivity is ensured.

公开(公告)号：US09231182B2

公开(公告)日：2016-01-05

申请号：US14718645

申请日：2015-05-21

Applicant: TDK CORPORATION

Inventor： Hirofumi Natori ,  Kenichi Tochi ,  Akihiro Unno ,  Takashi Aoyagi

IPC: H01L41/047 ,  G01C19/5607

CPC classification number: H01L41/047 ,  G01C19/56 ,  G01C19/5607

Abstract: In a piezoelectric element, a piezoelectric film, a first electrode film provided on one surface of the piezoelectric film, and a second electrode film provided on the other surface of the piezoelectric film form a layered structure, an outer contour of the first electrode film and an outer contour of the second electrode film are positioned outside an outer contour of the piezoelectric film as viewed in a layering direction, an organic resin film is in contact with the piezoelectric film, and generation of noise is suppressed.

Abstract translation: 在压电元件中，压电膜，设置在压电膜的一个表面上的第一电极膜和设置在压电膜的另一个表面上的第二电极膜形成层状结构，第一电极膜的外轮廓和 第二电极膜的外轮廓位于压电膜的外轮廓外侧，从分层方向观察，有机树脂膜与压电膜接触，抑制噪声的产生。

公开(公告)号：US12184078B2

公开(公告)日：2024-12-31

申请号：US17767668

申请日：2020-12-04

Applicant: TDK Corporation

Inventor： Yoshinobu Takayanagi ,  Akihiro Unno ,  Saiki Shigemori

IPC: H02J50/00 ,  H02J50/10 ,  H02M7/06

Abstract: An electromagnetic induction power generator includes a magnetic core attachable to a power transmission/distribution line, a power generating coil wound around the magnetic core, and a switching power supply circuit that converts AC appearing at both ends of the power generating coil into DC. The switching power supply circuit stops its switching operation based on a DC voltage level. The stop of the switching operation increases reactive power, allowing a stable power generating operation, i.e., a stable supply of active power irrespective of the amount of current flowing through the power transmission/distribution line. In addition, the amount of the reactive power can be finely adjusted based on the length of a period during which the switching operation is stopped, allowing a finer control of the reactive power.