公开(公告)号：US20200300941A1

公开(公告)日：2020-09-24

申请号：US16750124

申请日：2020-01-23

Applicant: TDK Corporation

Inventor： Yosuke ANTOKU ,  Hiroyuki HIRANO ,  Teiichiro OKA

IPC: G01R33/09 ,  G01D5/14 ,  G01D5/244 ,  G01R33/07 ,  G01R33/00

Abstract: A rotational angle detection device includes a magnet with n pole pairs (where n≥3) provided to be integrally rotatable with a rotating body; magnetic detection parts including first and second magnetic detection parts; a corrected signal generation part generating first and second corrected signals; and a rotational angle detection part detecting the rotational angle of the rotating body based on the first and second corrected signals. The waveform of the first and second detection signals have a phase difference of 90° from each other. The corrected signal generation part adds the first sensor signals and adds the second sensor signals. The region at the perimeter of the magnet includes first through nth regions, and at least two of the first and second magnetic sensor parts are positioned in different regions from each other among the first through nth regions.

公开(公告)号：US20200064156A1

公开(公告)日：2020-02-27

申请号：US16546455

申请日：2019-08-21

Applicant: TDK CORPORATION

Inventor： Hiroyuki HIRANO ,  Teiichiro OKA ,  Yosuke ANTOKU

IPC: G01D5/14

Abstract: A position detection system includes a first magnet, a first soft ferromagnetic member, and a magnetic detector. The first magnet is magnetized in a first direction and generates a first magnetic field including a first magnetic line. The first soft ferromagnetic member is rectilinearly movable along a second direction and includes a first outer edge having a first outer edge part remote from the first magnet by a first distance in a third direction and a second outer edge part remote from the first magnet by a second distance in the third direction. The first and second outer edge parts are disposed at different positions in the second direction. The magnetic detector is kept at a predetermined constant position relative to the first magnet. The first magnetic line passes through the magnetic detector in the first direction when the first soft ferromagnetic member is at rest.

公开(公告)号：US20240019270A1

公开(公告)日：2024-01-18

申请号：US18343952

申请日：2023-06-29

Applicant: TDK Corporation

Inventor： Teiichiro OKA ,  Ryoichi MENJU ,  Makoto TAKAHASHI ,  Hiroyuki HIRANO

IPC: G01D5/14

CPC classification number: G01D5/14

Abstract: A magnetic field detection device includes a magnetic field generation unit that generates a magnetic field, a magnetic field detection unit that detects the magnetic field, a first housing that has an accommodation unit that accommodates the magnetic field detection unit so that the magnetic field detection unit is exposed, and a second housing that movably accommodates a moving body. The strength or angle of the magnetic field generated from the magnetic field generation unit and applied to the magnetic field detection unit changes in accordance with movement of the moving body. The second housing has a mounting unit on which the first housing is mounted. The first housing is mounted on the mounting unit via a seal member that surrounds the magnetic field detection unit, so that the mounting unit is between the magnetic field detection unit and the moving body, and the inside of the accommodation unit is sealed by the seal member and the mounting unit.

公开(公告)号：US20200240762A1

公开(公告)日：2020-07-30

申请号：US16744630

申请日：2020-01-16

Applicant: TDK CORPORATION

Inventor： Hiroyuki HIRANO ,  Teiichiro OKA ,  Seiji FUKUOKA

IPC: G01B7/00 ,  G01D5/20 ,  H01F7/08

Abstract: A position detection apparatus includes a magnetic unit and a sensor. The magnetic unit includes a magnetic member and a retainer. The magnetic member includes a magnet and a first magnetic yoke. The magnet extends in an axial direction and has a cross-section orthogonal to the axial direction, and a first maximum outer diameter in a radial direction orthogonal to the axial direction. The cross-section has a substantially constant area in the axial direction. The first magnetic yoke is disposed adjacent to the magnet in the axial direction and has a second maximum outer diameter in the radial direction. The second maximum outer diameter is greater than the first maximum outer diameter. The retainer extends in the axial direction and retains the magnetic member. The sensor detects a magnetic field that changes in association with a movement of the magnetic unit along the axial direction.

公开(公告)号：US20250067550A1

公开(公告)日：2025-02-27

申请号：US18805854

申请日：2024-08-15

Applicant: TDK Corporation

Inventor： Hiroyuki HIRANO ,  Teiichiro OKA ,  Ryoichi MENJU ,  Makoto TAKAHASHI

IPC: G01B7/30 ,  G01D5/14 ,  G01D5/16

Abstract: When straight lines that are parallel to first to fourth long axes A1 to A4, that have the origin as their ends, and that pass through the first to fourth quadrants are defined as first to fourth imaginary lines B1 to B4, and the angles that the first to fourth imaginary lines make counterclockwise with respect to the boundary line between the first and fourth quadrants are θ1 to θ4, respectively, θ1 is greater than or equal to 0 degrees and less than or equal to 90 degrees, θ2 is greater than or equal to 90 degrees and less than or equal to 180 degrees, θ3 is greater than or equal to 180 degrees and less than or equal to 270 degrees, and θ4 is greater than or equal to 270 degrees and less than or equal to 360 degrees.

公开(公告)号：US20190271601A1

公开(公告)日：2019-09-05

申请号：US16224937

申请日：2018-12-19

Applicant: TDK Corporation

Inventor： Teiichiro OKA ,  Hiroyuki HIRANO ,  Mikio SUMIYOSHI ,  Makoto TAKAHASHI

IPC: G01K7/42 ,  G01K7/16 ,  G01R15/20 ,  G01K7/01 ,  G05F1/10

Abstract: A sensor is provided with a magnetic detection element that can output an output voltage within a predetermined voltage range according to a magnetic field intensity, an output voltage fixing part that can fix a voltage value of the output voltage to a voltage value outside the voltage range, and a drive voltage output part that can output a drive voltage for driving the output voltage fixing part. The drive voltage fixing part outputs the drive voltage to the output voltage fixing part when the ambient temperature of the drive voltage output part exceeds a predetermined threshold, and when triggered by input of the drive voltage, the output voltage fixing part fixes the voltage value of the output voltage to a voltage value outside the voltage range.

公开(公告)号：US20190187224A1

公开(公告)日：2019-06-20

申请号：US16221725

申请日：2018-12-17

Applicant: TDK Corporation

Inventor： Teiichiro OKA ,  Hiroyuki HIRANO ,  Mikio SUMIYOSHI ,  Makoto TAKAHASHI

IPC: G01R33/07 ,  H01L43/06 ,  G01R19/00

Abstract: A sensor intermediate part is provided with a physical quantity detection element that has a power source terminal, a ground terminal and an output terminal that outputs a desired output signal, where the physical quantity detection element is capable of adjusting properties of the output signal; a high-capacitance capacitor, which has at least a first terminal and a second terminal, and a jumper wire, one end of which is conducted to either the power source terminal or the second terminal and the other end of which is not conducted. The first terminal is conducted to the ground terminal, and the power source terminal and the second terminal are configured to be electrically connectable by the jumper wire.