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公开(公告)号：US20230314178A1
公开(公告)日：2023-10-05
申请号：US18182046
申请日：2023-03-10
Applicant: TDK CORPORATION
Inventor： Yongfu CAI
Abstract: A magnetic encoder includes a magnetic field generator configured to generate a target magnetic field including a magnetic field component, and a magnetic sensor configured to detect the target magnetic field. The magnetic sensor includes a plurality of resistors each configured to change in resistance with change in strength of the magnetic field component. The magnetic field generator is a magnetic scale including a plurality of pairs of N and S poles alternately arranged. A magnetic pole pitch being a center-to-center distance between two N poles adjoining via one S pole is different from a design pitch being four times a distance between a predetermined position in one resistor included in the plurality of resistors and a predetermined position in another resistor.
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公开(公告)号：US20230140621A1
公开(公告)日：2023-05-04
申请号：US18090664
申请日：2022-12-29
Applicant: TDK CORPORATION
Inventor： Yongfu CAI , Shuhei MIYAZAKI , Kazuma YAMAWAKI
IPC: H01L23/28 , H01L23/498 , H01L23/00
Abstract: An electronic component package of an embodiment of the disclosure includes a base, a first plated layer, a first electronic component chip, a second plated layer, and a second electronic component chip. The base includes a first surface and a second surface. The first plated layer covers the first surface. The first electronic component chip is provided on the first plated layer with a first insulating layer being interposed therebetween. The second plated layer covers the second surface. The second electronic component chip is provided on the second plated layer with a second insulating layer being interposed therebetween. The first plated layer and the second plated layer each include a first metal material that is less likely to undergo an ion migration phenomenon than silver (Ag).
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公开(公告)号：US20220268564A1
公开(公告)日：2022-08-25
申请号：US17745311
申请日：2022-05-16
Applicant: TDK CORPORATION
Inventor： Yongfu CAI , Hiraku HIRABAYASHI
Abstract: 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.
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公开(公告)号：US20220090940A1
公开(公告)日：2022-03-24
申请号：US17387622
申请日：2021-07-28
Applicant: TDK CORPORATION
Inventor： Yongfu CAI
Abstract: A position detection unit includes a magnetic sensor and a first magnetic field generator. The first magnetic field generator is spaced from and opposed to the magnetic sensor in a first-axis direction, includes a first multipolar magnet, and generates a first magnetic field to be exerted on the magnetic sensor. The first multipolar magnet includes N and S poles adjacent to each other along a plane orthogonal to the first-axis direction. The magnetic sensor and the first magnetic field generator are relatively movable with respect to each other along a second-axis direction orthogonal to the first-axis direction. A center position of the magnetic sensor in a third-axis direction orthogonal to both of the first-axis direction and the second-axis direction is different from a position in the third-axis direction of an interface between the N and S poles adjacent to each other in the third-axis direction.
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Patent Agency Ranking
公开(公告)号：US20210382124A1
公开(公告)日：2021-12-09
申请号：US17411514
申请日：2021-08-25
Applicant: TDK Corporation
Inventor： Naoki OHTA , Yongfu CAI
Abstract: A magnetic sensor device having a spin-valve-type magnetoresistive effect element and capable of stably applying a bias magnetic field on the free layer of the magnetoresistive effect element includes a spin-valve-type magnetoresistive effect element, a substrate on which the magnetoresistive effect element is positioned, a power source that supplies a substantially constant electric current applied on the magnetoresistive effect element, and a magnetic field generator that is connected to the electric current path of the electric current applied on the magnetoresistive effect element in series. The magnetic field generator is provided to be capable of applying a bias magnetic field on at least a portion of the magnetoresistive effect element. The magnetic field generator is close to a portion of the magnetoresistive effect element and is positioned at a different level from the substrate.
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公开(公告)号：US20210372819A1
公开(公告)日：2021-12-02
申请号：US17243242
申请日：2021-04-28
Applicant: TDK CORPORATION
Inventor： Yongfu CAI
Abstract: A position detection unit includes a magnetic sensor, a first magnetic field generator, and a second magnetic field generator. The first magnetic field generator includes a first magnet and a second magnet spaced apart from each other in a first direction, and generates a first magnetic field. The second magnetic field generator generates a second magnetic field and is movable along a second direction orthogonal to the first direction with respect to the first magnetic field generator and the magnetic sensor. In the first direction, a center position of the magnetic sensor lies at a position in a region between the first magnet and the second magnet other than a midpoint position between the first magnet and the second magnet. The magnetic sensor generates a detection signal corresponding to a direction of a magnetic field to be detected, and detects a positional change of the second magnetic field generator.
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公开(公告)号：US20210318513A1
公开(公告)日：2021-10-14
申请号：US17196330
申请日：2021-03-09
Applicant: TDK CORPORATION
Inventor： Yongfu CAI , Hiraku HIRABAYASHI , Tsuyoshi UMEHARA
Abstract: 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.
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公开(公告)号：US20210203852A1
公开(公告)日：2021-07-01
申请号：US17126551
申请日：2020-12-18
Applicant: TDK Corporation
Inventor： Yongfu CAI , Hiraku HIRABAYASHI , Shusuke ICHIHASHI
Abstract: The position detecting device of the present invention is a device for detecting the position of a movable detection target within a predetermined movable range. The position detecting device comprises: a first magnet (13A) and a second magnet (13B) which are arranged so as to move integrally with the movement of the detection target; a first magnetic detecting circuit (20A) that detects the magnetic field of the first magnet (13A) and a second magnetic detecting circuit (20B) that detects the magnetic field of the second magnet (13B), which are arranged at positions outside the movable range; and a differential amplifier (8) that amplifies the difference between the detection signals of the magnetic field output from the first magnetic detecting circuit (20A) and the second magnetic detecting circuit (20B), and that outputs the amplified difference of the signal as a position detecting signal of the detection target.
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公开(公告)号：US20200088507A1
公开(公告)日：2020-03-19
申请号：US16527117
申请日：2019-07-31
Applicant: TDK CORPORATION
Inventor： Yongfu CAI , Hiraku HIRABAYASHI
Abstract: 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.
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