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1. 发明授权

US11959943B2 Magnetic field detection apparatus and current detection apparatus 有权
公开(公告)号：US11959943B2
公开(公告)日：2024-04-16
申请号：US17825702
申请日：2022-05-26
申请人： TDK CORPORATION
发明人： Norikazu Ota , Kenzo Makino , Hiraku Hirabayashi
IPC分类号： G01R15/20 , G01R19/00 , G01R33/09 , H01C7/00 , H01F7/06 , H01F27/28
CPC分类号： G01R15/205 , G01R19/0092 , G01R33/091 , H01C7/00 , H01F7/064 , H01F27/28
摘要： A magnetic field detection apparatus includes a magnetoresistive effect element and a conductor. The magnetoresistive effect element includes a magnetoresistive effect film extending in a first axis direction and including a first end part, a second end part, and an intermediate part between the first and second end parts. The conductor includes a first part and a second part that each extend in a second axis direction inclined with respect to the first axis direction. The conductor 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 a third axis direction orthogonal to the second axis direction. The first part and the second part respectively overlap the first end part and the second end part in a fourth axis direction orthogonal to both of the second axis direction and the third axis direction.

2. 发明授权

US11946989B2 Magnetic sensor device and magnetic sensor system 有权
公开(公告)号：US11946989B2
公开(公告)日：2024-04-02
申请号：US18197913
申请日：2023-05-16
申请人： TDK CORPORATION
发明人： Norikazu Ota , Hiraku Hirabayashi , Kazuma Yamawaki , Shuhei Miyazaki , Kazuya Watanabe
IPC分类号： G01R33/09 , G01R33/02
CPC分类号： G01R33/098 , G01R33/0206 , G01R33/093
摘要： A magnetic sensor device includes at least one magnetic sensor and a support. A center of gravity of an element layout area of the at least one magnetic sensor is deviated from a center of gravity of a reference plane of the support. The at least one magnetic sensor includes four resistor sections constituted by a plurality of magnetoresistive elements. Magnetization of a free layer in each of two of the resistor sections includes a component in a third magnetization direction. The magnetization of a free layer in each of the other two resistor sections includes a component in a fourth magnetization direction opposite to the third magnetization direction.

3. 发明授权

US11914008B2 Magnetic sensor 有权
公开(公告)号：US11914008B2
公开(公告)日：2024-02-27
申请号：US18295898
申请日：2023-04-05
申请人： TDK Corporation
发明人： Keisuke Uchida , Hiraku Hirabayashi
IPC分类号： G01R33/09 , H01F10/32 , H01F3/00 , H01F1/12
CPC分类号： G01R33/09 , G01R33/093 , H01F1/12 , H01F3/00 , H01F10/3254 , H01F10/3268
摘要： The magnetic sensor can prevent an increase of a positional detection error of a subject/object even in the case of applying an external magnetic field with a magnetic field intensity exceeding a predetermined range. A magnetic sensor is equipped with a magnetoresistive effect element (MR element) 11 that can detect an external magnetic field and a soft magnetic body shield 12. The soft magnetic body shield(s) 12 are/is positioned above and/or below the MR element 11 in a side view, and the size of the MR element 11 is physically included within a perimeter of the soft magnetic body shield 12.

4. 发明授权

US11674822B2 Position detection device 有权
公开(公告)号：US11674822B2
公开(公告)日：2023-06-13
申请号：US16890284
申请日：2020-06-02
申请人： TDK CORPORATION
发明人： Tsuyoshi Umehara , Hayato Miyashita , Keisuke Uchida , Hiraku Hirabayashi
IPC分类号： G01D5/14 , G01D5/16 , G02B7/00 , G03B3/00 , G03B5/00
CPC分类号： G01D5/16 , G01D5/145 , G02B7/00 , G03B3/00 , G03B5/00
摘要： 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.

5. 发明授权

US11619659B2 Magnetic sensor device, inverter apparatus, and battery apparatus 有权
公开(公告)号：US11619659B2
公开(公告)日：2023-04-04
申请号：US17537737
申请日：2021-11-30
申请人： TDK CORPORATION
发明人： Yuta Saito , Hiraku Hirabayashi
IPC分类号： G01R15/20 , G01R31/364
摘要： A magnetic sensor device includes a first detection circuit that generates a first detection signal, a coil through which a feedback current is passed to generate a cancellation magnetic field, a second detection circuit that generates a second detection signal having a correspondence with a value of the feedback current, and a control circuit that controls the feedback current. In a closed-loop operation, the control circuit controls the feedback current so that the first detection signal has a constant value. In an open-loop operation, the control circuit maintains the feedback current at a constant value.

6. 发明授权

US11598653B2 Rotational angle detection apparatus and rotating machine apparatus 有权
公开(公告)号：US11598653B2
公开(公告)日：2023-03-07
申请号：US17825715
申请日：2022-05-26
申请人： TDK Corporation
发明人： Masaki Nagata , Kazuya Watanabe , Hiraku Hirabayashi
IPC分类号： G01D5/20 , G01D5/14 , G01D5/16
摘要： A rotational angle detection apparatus is provided with a magnet disposed so as to be rotatable integrally with an axis of rotation, having a substantially circular shape when viewed along the axis of rotation, and including a magnetization vector component in a direction orthogonal to the axis of rotation; a magnetic sensor that outputs a sensor signal on the basis of change in a magnetic field accompanying rotation of the magnet; and a rotational angle detector that detects a rotational angle of the rotating body on the basis of the sensor signal output by the magnetic sensor; wherein the magnet has a curved inclined surface with a concave shape along the axis of rotation from a prescribed position on the outer side in a radial direction toward the axis of rotation, and when a circular virtual plane orthogonal to the axis of rotation and centered at the axis of rotation is established at a position opposed to the curved inclined surface, the magnetic sensor is disposed at a position at which the amplitudes of a magnetic field intensity Hr in a radial direction and a magnetic field intensity Hθ in a circumferential direction on the virtual plane are substantially the same, and the magnetic field intensities Hr and Hθ in the radial direction and/or the circumferential direction is output as the sensor signal.

7. 发明授权

US11359908B2 Angle sensor system 有权
公开(公告)号：US11359908B2
公开(公告)日：2022-06-14
申请号：US16527117
申请日：2019-07-31
申请人： TDK CORPORATION
发明人： Yongfu Cai , Hiraku Hirabayashi
IPC分类号： G01B7/30 , G01B7/00 , G01R33/09 , G01R33/07 , G01R33/00
摘要： A magnetic field generator generates a detection-target magnetic field related to an angle to be detected. An angle sensor includes a first and a second magnetic sensor and a processor. The first magnetic sensor detects, at a first detection position, a first applied magnetic field including the detection-target magnetic field, and generates first detection information having a correspondence with the angle to be detected. The second magnetic sensor detects, at a second detection position, a second applied magnetic field including the detection-target magnetic field, and generates second detection information having a correspondence with the angle to be detected. The processor generates an angle detection value by performing arithmetic processing using the first and second detection information. The ratio of a strength of the detection-target magnetic field at the second detection position to a strength of the detection-target magnetic field at the first detection position is 1.65 or more.

8. 发明授权

US10983181B2 Magnetic sensor 有权
公开(公告)号：US10983181B2
公开(公告)日：2021-04-20
申请号：US16407234
申请日：2019-05-09
申请人： TDK Corporation
发明人： Kenichi Takano , Yuta Saito , Hiraku Hirabayashi
IPC分类号： G01R33/09 , H01L43/10 , H01F10/32 , G01R33/00 , B82Y25/00
摘要： A magnetic sensor whose output characteristic is less sensitive to the environmental temperature is provided. Magnetic sensor 1 has free layer 24 whose magnetization direction changes in response to an external magnetic field, pinned layer 22 whose magnetization direction is fixed with respect to the external magnetic field, spacer layer 23 that is located between pinned layer 22 and free layer 24 and that exhibits a magnetoresistance effect, and at least one magnet film 25 that is disposed on a lateral side of free layer 24 and that applies a bias magnetic field to free layer 24. A relationship of 0.7 ≤TC_HM/TC_FL≤1.05 is satisfied, where TC_HM is Curie temperature of the magnet film, and TC_FL is Curie temperature of the free layer.

9. 发明授权

US10697801B2 Rotational angle detection apparatus and rotating machine apparatus 有权
公开(公告)号：US10697801B2
公开(公告)日：2020-06-30
申请号：US15450273
申请日：2017-03-06
申请人： TDK Corporation
发明人： Masaki Nagata , Kazuya Watanabe , Hiraku Hirabayashi
IPC分类号： G01D5/20 , G01D5/14 , G01D5/16
摘要： A rotational angle detection apparatus is provided with a magnet disposed so as to be rotatable integrally with an axis of rotation, having a substantially circular shape when viewed along the axis of rotation, and including a magnetization vector component in a direction orthogonal to the axis of rotation; a magnetic sensor that outputs a sensor signal on the basis of change in a magnetic field accompanying rotation of the magnet; and a rotational angle detector that detects a rotational angle of the rotating body on the basis of the sensor signal output by the magnetic sensor; wherein the magnet has a curved inclined surface with a concave shape along the axis of rotation from a prescribed position on the outer side in a radial direction toward the axis of rotation, and when a circular virtual plane orthogonal to the axis of rotation and centered at the axis of rotation is established at a position opposed to the curved inclined surface, the magnetic sensor is disposed at a position at which the amplitudes of a magnetic field intensity Hr in a radial direction and a magnetic field intensity Hθ in a circumferential direction on the virtual plane are substantially the same, and the magnetic field intensities Hr and Hθ in the radial direction and/or the circumferential direction is output as the sensor signal.

10. 发明授权

US10527683B2 Magnetic sensor device 有权
公开(公告)号：US10527683B2
公开(公告)日：2020-01-07
申请号：US15921969
申请日：2018-03-15
申请人： TDK Corporation
发明人： Kunihiro Ueda , Koichi Otani , Hiraku Hirabayashi , Shuhei Miyazaki
IPC分类号： G01R33/00 , G01R33/09 , G01R33/07 , G01R33/12
摘要： A magnetic sensor device comprises a magnetic sensor chip that has a substantially rectangular shape and that contains a magnetic sensor element; and a sealing body, which is composed of a resin material containing magnetic particles and that integrally seals the chip. The chip includes a first and second side surfaces which are mutually opposite to each other, and a third and fourth side surfaces which are mutually opposite to each other and orthogonal to the first and second side surfaces. The sealing body contains first to forth sealing parts. The thicknesses of the first and second sealing parts are smaller than the particle diameter of the particles, and the thickness of at least the third sealing part is larger than the particle diameter of the particles. The particles exist in at least the third sealing part and substantially do not exist in the first and second sealing parts.

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