Tdk Corporation

Tsuyoshi Umehara

Hiraku Hirabayashi

Hayato Miyashita

Masanori Sakai

Masashi Shiraishi

Kenichi Takano

Haruyuki Morita

Keisuke Uchida

Kunihiro Ueda

Yoshimitsu Wada

Kazuma Yamawaki

Yongfu Cai

Ken-ichi Takano

Kentaro Harada

Norikazu Ota

Isamu Sato

Yuta Saito

Tsutomu Aoyama

Yosuke Antoku

Nobuya Oyama

Soji Koide

Yoshiyuki Mizoguchi

Yohei Hirota

Izumi Nomura

Kazuhide Yamada

Kenzo Makino

Shinichirou Mochizuki

Katsumichi Tagami

Takafumi Kobayashi

Hiroki Matsukuma

Toshihide Suto

Hiroshi Naganuma

Koji Shimazawa

Kazuya Watanabe

Naoki Ohta

Satoru Araki

Hiroshi Kiyono

Shunji Saruki

Tetsuya Kuwashima

Takakazu Imai

Satoshi Abe

Takumi Uesugi

Yosuke Komasaki

Tatsuhiro Nojima

Yoshikazu Sawada

Yuichiro Yamaji

A pair of bias magnets applies a bias magnetic field to the magneto-resistive effect element, the bias magnetic field having a component in a direction such that the component cancels the external magnetic field that is applied to the magneto-resistive effect element and a component that is perpendicular to the external magnetic field. The bias magnet has an elongate cross section in a plane that is parallel both to the external magnetic field and to the bias magnetic field. In a projection plane that is parallel to the cross section and onto which the bias magnets and the magneto-resistive effect element are projected, the bias magnet includes an element facing side that is opposite to the magneto-resistive effect element and that extends in a longitudinal direction. The bias magnet is magnetized in a direction that is perpendicular to the longitudinal direction. The element facing side is longer than other sides.

Magnetic sensor and camera module

A position detection device includes a first position detector, a second position detector, and a signal generator. The first position detector includes a first magnetic field generation unit, a second magnetic field generation unit, and a first magnetic sensor. The second position detector includes a third magnetic field generation unit, a fourth magnetic field generation unit, and a second magnetic sensor. The positions of the second and fourth magnetic field generation units vary in response to variations in a detection-target position. The signal generator generates a position detection signal, which is the sum of a first detection signal generated by the first magnetic sensor and a second detection signal generated by the second magnetic sensor. Each of the first and second position detectors includes a bias magnetic field generation unit.

Position detection device

This sensor unit includes a base having a substantially-rectangular planar shape including a first side and a second side that are substantially orthogonal to each other, and a plurality of first sensors provided on the base and arranged on a first axis. The first axis is substantially parallel to the first side and passes through a center position of the base.

Sensor unit

In a magnetic sensor, first and second resistors are provided in a path that connects a power supply port and a first output port, and third and fourth resistors are provided in a path that connects a ground port and the first output port. In a direction parallel to an X direction, both of a distance between the first resistor and the second resistor and a distance between the third resistor and the fourth resistor are λ/2, and a distance between the first resistor and the third resistor is zero. A magnetization of a magnetization pinned layer in the first and fourth resistors contains a component in a −X direction. The magnetization of the magnetization pinned layer in the second and third resistors contains a component in the X direction.

Magnetic sensor, magnetic encoder, lens position detection device, distance measuring device, and manufacturing method for magnetic sensor

A method of designing a magnetic sensor that can easily accommodate various design conditions is provided. The method has:

Method of designing and manufacturing magnetic sensor

A magnetic sensor is provided that can attenuate a magnetic field in a direction that is perpendicular to the magnetic field detecting direction at a higher rate than the magnetic field in the magnetic field detecting direction. Magnetic sensorhas: first soft magnetic layera pair of second soft magnetic layersA,B that is positioned at a location that is different from first soft magnetic layerin the Z direction of first soft magnetic layerand magnetic field detecting elementthat is positioned between first soft magnetic layerand second soft magnetic layersA,B in the Z direction, wherein magnetic field detecting elementhas a magnetic field detecting direction that is parallel to a direction in which the pair of second soft magnetic layersA,B is arranged. As viewed in the Z direction, second soft magnetic layersA,B are positioned on both sides of a center of first soft magnetic layerand magnetic field detecting elementis positioned inside of a periphery of first soft magnetic layer

Magnetic sensor

A magnetic sensor is provided that can attenuate a magnetic field in a direction that is perpendicular to the magnetic field detecting direction at a higher rate than the magnetic field in the magnetic field detecting direction. Magnetic sensorhas: first soft magnetic layer; a pair of second soft magnetic layersA,B that is positioned at a location that is different from first soft magnetic layerin the Z direction of first soft magnetic layer; and magnetic field detecting elementthat is positioned between first soft magnetic layerand second soft magnetic layersA,B in the Z direction, wherein magnetic field detecting elementhas a magnetic field detecting direction that is parallel to a direction in which the pair of second soft magnetic layersA,B is arranged. As viewed in the Z direction, second soft magnetic layersA,B are positioned on both sides of a center of first soft magnetic layer, and magnetic field detecting elementis positioned inside of a periphery of first soft magnetic layer

A magnetic sensor includes first to fourth resistors, a power supply port, a ground port, a first output port, and a second output port. The first resistor and the second resistor are located in a first region and connected in series via a first connection point connected to the first output port. The third resistor and the fourth resistor are located in a second region and connected in series via a second connection point connected to the second output port, at least a part of the second region being located at a position different from the first region in a direction parallel to an X direction. The first and second resistors are located between the third and fourth resistors in a direction parallel to a Y direction.

Magnetic sensor, magnetic encoder, and lens position detection device

A magnetic sensor comprises a magnetoresistive effect element including a first side surface and a second side surface facing in opposite directions along a first axis and a first end surface and a second end surface facing in opposite directions along a second axis substantially orthogonal to the first axis. The sensor has a sensitivity axis extending in a direction of the first axis, a first yoke unit provided adjacent to the first side surface of the magnetoresistive effect element, and a first bias magnetic field generation unit provided adjacent to the first end surface of the magnetoresistive effect element. The first bias magnetic field generation unit is provided to be capable of applying a bias magnetic field on the magnetoresistive effect element and the first yoke unit.

Magnetic sensor, and a current sensor and position detection device using a magnetic sensor

Magnetic sensor assemblyhas first memberhaving first to third magnetic sensorsA toC, and second memberhaving first to third magnetsA toC. Second membercan be moved in X and Y directions and can be rotated about a Z axis relative to first member. Output of first to third magnetic sensorsA toC monotonously changes. A change of the output of first magnetic sensor and a change of the output of second magnetic sensor are different from each other. First to third magnets are positioned on first to third straight lines Lto L. A first angle that is formed between first straight line Land X axis, a second angle that is formed between second straight line Land X axis, and a third angle that is formed between third straight line Land Y axis are same.

Magnetic sensor assembly and camera module having the same

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Tokyo, Japan

Tsuyoshi Umehara