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公开(公告)号：US12253580B2
公开(公告)日：2025-03-18
申请号：US17949557
申请日：2022-09-21
Applicant: TDK CORPORATION
Inventor： Takehiro Isoda , Norikazu Ota , Daichi Takano , Kenji Inage
Abstract: A magnetic sensor includes a plurality of resistor sections each including a plurality of MR elements, and a plurality of protruding surfaces each structured to cause the plurality of MR elements to detect a specific component of a target magnetic field. The plurality of MR elements are disposed dividedly in first to fourth areas corresponding respectively to the plurality of resistor sections. The plurality of protruding surfaces include a structural body extending across at least two of the first to fourth areas.
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公开(公告)号：US09230586B1
公开(公告)日：2016-01-05
申请号：US14335984
申请日：2014-07-21
Applicant: TDK Corporation
Inventor： Norikazu Ota , Osamu Nakada , Mitsuo Otsuki , Shinji Hara , Daisuke Miyauchi , Tetsuya Roppongi , Koji Shimazawa
CPC classification number: G11B5/607 , G11B5/6011 , G11B5/6029 , G11B5/6052 , G11B5/6076 , G11B5/6088 , G11B2005/0021
Abstract: While a plurality of drive currents for flying height setting with current values smaller than a tentative optimum drive current are supplied to a light source, respectively, heater power is supplied to a heater part, and touch down of a thermally-assisted magnetic recording head is detected. Tentative optimum heater power is determined based on a correlation between the heater power when the touch down is detected and each drive current for flying height setting. The tentative optimum drive current is supplied to the light source part; the tentative optimum heater power is supplied to the heater part; a reference signal is recorded in a magnetic recording medium; and flying height of the thermally-assisted magnetic recording head is set by determining whether or not the reference signal is recorded with the desired signal intensity.
Abstract translation: 虽然分别将用于飞行高度设定的多个驱动电流设置为具有小于暂定最佳驱动电流的电流值，但是分别将加热器电力提供给加热器部分，并且热辅助磁记录头的向下触摸 检测到。 基于检测到触摸时的加热器功率与用于飞行高度设置的每个驱动电流之间的相关性来确定暂定最佳加热器功率。 暂定最佳驱动电流被提供给光源部分; 将暂定的最佳加热器功率提供给加热器部件; 参考信号被记录在磁记录介质中; 并且通过确定参考信号是否以期望的信号强度被记录来设定热辅助磁记录头的飞行高度。
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3.发明授权公开(公告)号：US08908328B2
公开(公告)日：2014-12-09
申请号：US13644903
申请日：2012-10-04
Applicant: TDK Corporation
Inventor： Masahiro Saito , Norikazu Ota , Hiromichi Umehara , Masachika Hashino
CPC classification number: G11B5/147 , G11B5/1278 , G11B5/3116
Abstract: A perpendicular magnetic write head includes: a magnetic pole having an end surface exposed on an air bearing surface, and extending in a height direction perpendicular to the air bearing surface; a first yoke having an end surface exposed on the air bearing surface, and facing a forward section of the magnetic pole with a gap layer in between; a second yoke located behind the first yoke with an insulating layer in between in the height direction, and connected to a backward section of the magnetic pole; a shield connecting the first yoke to the second yoke; and an additional magnetic layer located behind a boundary between the first yoke and the insulating layer, and in contact with the first yoke.
Abstract translation: 垂直磁性写头包括：磁极，具有暴露在空气轴承表面上的端面，并且在垂直于空气轴承表面的高度方向上延伸; 第一磁轭，其端面暴露在空气轴承表面上，并且面对具有间隙层的磁极的前部; 位于第一磁轭后面的第二磁轭，其在高度方向之间具有绝缘层，并且连接到磁极的后部; 连接第一磁轭和第二磁轭的屏蔽件; 以及位于第一磁轭和绝缘层之间的边界后面并与第一磁轭接触的附加磁性层。
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公开(公告)号：US12188996B2
公开(公告)日：2025-01-07
申请号：US17948429
申请日：2022-09-20
Applicant: TDK CORPORATION
Inventor： Norikazu Ota , Shinichirou Mochizuki , Kazuya Watanabe , Hiraku Hirabayashi
Abstract: A magnetic sensor device includes a first detection circuit, a second detection circuit, and a processor. The processor is configured to execute first generation processing for generating a first initial detection value, second generation processing for generating a second initial detection value, first correction processing, second correction processing, and determination processing. The first correction processing is processing for correcting the first initial detection value and updating the first initial detection value. The second correction processing is processing for correcting the second initial detection value and updating the second initial detection value. The processor executes the determination processing after alternately executing the first correction processing and the second correction processing.
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公开(公告)号：US20240361403A1
公开(公告)日：2024-10-31
申请号：US18642084
申请日：2024-04-22
Applicant: TDK CORPORATION
Inventor： Takehiro Isoda , Norikazu Ota
IPC: G01R33/09
CPC classification number: G01R33/09
Abstract: A magnetic sensor includes a plurality of MR elements, a plurality of yokes each including a portion long in a first direction, and a plurality of shields each including a portion long in a second direction. The plurality of MR elements include a plurality of first specific elements. The plurality of yokes include a plurality of yoke pairs each including one of the plurality of first specific elements. The plurality of shields include a plurality of shield pairs each with one of the plurality of first specific elements therebetween. The plurality of first specific elements are arranged in a direction intersecting both the first direction and the second direction.
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Patent Agency Ranking
公开(公告)号：US11940506B2
公开(公告)日：2024-03-26
申请号：US17881666
申请日：2022-08-05
Applicant: TDK CORPORATION
Inventor： Kenzo Makino , Norikazu Ota
CPC classification number: G01R33/098 , G01R33/096 , H01F7/20 , H01C7/00
Abstract: A magnetic sensor includes at least one MR element and a coil. The coil includes at least one conductor portion. The at least one conductor portion is each located at a position such that a partial magnetic field generated by the conductor portion is applied to one of the at least one MR element, the one corresponding to the conductor portion, and extends along an imaginary curve curving to protrude in a direction away from the corresponding MR element.
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公开(公告)号：US11372029B2
公开(公告)日：2022-06-28
申请号：US17081232
申请日：2020-10-27
Applicant: TDK CORPORATION
Inventor： Norikazu Ota , Kenzo Makino , Hiraku Hirabayashi
Abstract: 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.
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公开(公告)号：US09997178B1
公开(公告)日：2018-06-12
申请号：US15417540
申请日：2017-01-27
Applicant: TDK Corporation
Inventor： Yuki Nishimura , Norikazu Ota
CPC classification number: G11B5/314 , G11B5/1278 , G11B5/6088 , G11B2005/0021
Abstract: A thermally assisted magnetic recording head includes: a main pole that has a main pole end face at an air bearing surface opposing a magnetic recording medium and emits magnetic flux from the main pole end face; a waveguide that propagates laser light as propagation light and has a first waveguide section provided with an incidence end face on which the laser light is incident, a second waveguide section provided with a waveguide end face positioned close to the main pole end face on the air bearing surface, and a third waveguide section that connects the first waveguide section to the second waveguide section; a metal layer surrounds at least a portion of the first waveguide section, the entire circumference of the second waveguide section and at least a portion of the third waveguide section.
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公开(公告)号：US11885835B2
公开(公告)日：2024-01-30
申请号：US17866859
申请日：2022-07-18
Applicant: TDK CORPORATION
Inventor： Takafumi Kobayashi , Norikazu Ota , Kenzo Makino
CPC classification number: G01R15/205 , G01R19/0092 , G01R33/09
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：US11686788B2
公开(公告)日：2023-06-27
申请号：US17734674
申请日：2022-05-02
Applicant: TDK CORPORATION
Inventor： Norikazu Ota , Hiraku Hirabayashi , Kazuma Yamawaki , Shuhei Miyazaki , Kazuya Watanabe
CPC classification number: G01R33/098 , G01R33/0206 , G01R33/093
Abstract: 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.
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