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公开(公告)号：US20250035468A1
公开(公告)日：2025-01-30
申请号：US18917328
申请日：2024-10-16
Applicant: TDK Corporation
Inventor： Yongfu CAI , Tsuyoshi UMEHARA , Takafumi KOBAYASHI
IPC: G01D5/16 , G01D5/14 , G03B30/00 , H02K11/215 , H04N23/54
Abstract: A position detection device includes a magnetic field generator and a magnetic sensor. The magnetic field generator is configured so that a mode of variation in a target magnetic field relative to variation in a position of a key cap varies nonlinearly relative to the variation in the position of the key cap. The magnetic sensor is configured so that a mode of variation in a detection signal relative to the variation in the target magnetic field varies nonlinearly relative to the variation in the target magnetic field.
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Patent Agency Ranking
公开(公告)号：US20230176151A1
公开(公告)日：2023-06-08
申请号：US18161964
申请日：2023-01-31
Applicant: TDK Corporation
Inventor： Tsuyoshi UMEHARA , Kentaro HARADA , Takafumi KOBAYASHI
CPC classification number: G01R33/093 , G01R33/0052
Abstract: A method of designing a magnetic sensor that can easily accommodate various design conditions is provided. The method has:
preparing magnetic sensors, wherein, for each magnetic sensor, magnetization directions of the first to fourth magnetically pinned layers form first to fourth angles θ1 to θ4 relative to a specific reference angle, respectively, and θ1=θ3, θ2=θ4, θ1≠θ2, and each magnetic sensor has a value of θ1-θ2 that is different from values of θ1-θ2 of remaining magnetic sensors,
for each magnetic sensor, obtaining a relationship between an angular range of the magnetization direction of the first to fourth magnetically free layers and an output range of the magnetic sensor, wherein the angular range satisfies a specific linear relationship between the magnetization direction and the output of the magnetic sensor, and
selecting a magnetic sensor that satisfies required conditions for the angular range and the output range from among the magnetic sensors.-
公开(公告)号：US20220349921A1
公开(公告)日：2022-11-03
申请号：US17866859
申请日：2022-07-18
Applicant: TDK CORPORATION
Inventor： Takafumi KOBAYASHI , Norikazu OTA , Kenzo MAKINO
Abstract: A magnetic field detection apparatus includes a magnetoresistive effect element and a coil. The coil includes first and second tier parts opposed to each other in a first axis direction, with the magnetoresistive dal element interposed therebetween. The coil is configured to be supplied with a current and thereby configured to generate an induction magnetic field to be applied to the magnetoresistive effect element in a second axis direction. The first tier part includes first conductors extending in a third axis direction, arranged in the second axis direction and coupled in parallel to each other. The second tier part includes a second conductor or second conductors extending in the third axis direction, the second conductors being arranged in the second axis direction and coupled in parallel to each other. The first conductor each have a width smaller than a width of the second conductor or each of the second conductors.
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公开(公告)号：US20220260654A1
公开(公告)日：2022-08-18
申请号：US17552994
申请日：2021-12-16
Applicant: TDK Corporation
Inventor： Takafumi KOBAYASHI
IPC: G01R33/09 , G01R33/421 , G01R33/00
Abstract: A magnetic sensor includes a magnetic field conversion unit that outputs an output magnetic field, a magnetic field detection unit that the output magnetic field can be applied, and a magnetic shield that shields external magnetic fields. The length of the magnetic field conversion unit in the third direction is greater than the length in the second direction. The magnetic shield overlaps the magnetic field conversion unit and the magnetic field detection unit. The magnetic field detection unit includes a Wheatstone bridge circuit in which a first bridge circuit including first and second magnetic field detection units and a second bridge circuit including third and fourth magnetic field detection units are connected in parallel. The first through fourth magnetic field detection units include two magnetoresistive units, and two of the magnetoresistive units have magnetoresistive effect elements that include magnetization fixed layers whose magnetization directions differ from each other.
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公开(公告)号：US20220229124A1
公开(公告)日：2022-07-21
申请号：US17543951
申请日：2021-12-07
Applicant: TDK Corporation
Inventor： Tsuyoshi UMEHARA , Kentaro HARADA , Takafumi KOBAYASHI
Abstract: A method of designing a magnetic sensor that can easily accommodate various design conditions is provided. The method has: preparing magnetic sensors, wherein, for each magnetic sensor, magnetization directions of the first to fourth magnetically pinned layers form first to fourth angles θ1 to θ4 relative to a specific reference angle, respectively, and θ1=θ3, θ2=θ4, θ1≠θ2, and each magnetic sensor has a value of θ1-θ2 that is different from values of 01-02 of remaining magnetic sensors, for each magnetic sensor, obtaining a relationship between an angular range of the magnetization direction of the first to fourth magnetically free layers and an output range of the magnetic sensor, wherein the angular range satisfies a specific linear relationship between the magnetization direction and the output of the magnetic sensor, and selecting a magnetic sensor that satisfies required conditions for the angular range and the output range from among the magnetic sensors.
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公开(公告)号：US20170287513A1
公开(公告)日：2017-10-05
申请号：US15084956
申请日：2016-03-30
Applicant: TDK Corporation
Inventor： Koji SHIMAZAWA , Shuji OKAME , Yoshihiro TSUCHIYA , Takafumi KOBAYASHI
CPC classification number: G11B5/314 , G11B5/012 , G11B5/127 , G11B5/187 , G11B5/313 , G11B5/3133 , G11B5/6088 , G11B2005/0021
Abstract: A thermal assisted magnetic recording head that performs magnetic recording while locally heating a magnetic recording medium includes: a plasmon generator that generates a surface plasmon and that generates near-field light from the surface plasmon on a front end surface positioned on an air bearing surface opposing the magnetic recording medium; a dielectric body layer positioned around the plasmon generator; and an adhesion layer positioned between the plasmon generator and the dielectric body layer. The adhesion layer is made from at least one of IrOx, RuOx, NiOx and CoOx.
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