公开(公告)号：US20240402268A1

公开(公告)日：2024-12-05

申请号：US18666979

申请日：2024-05-17

Applicant: TDK CORPORATION

Inventor： Takafumi KOBAYASHI

IPC: G01R33/09 ,  H04N23/50

Abstract: The present disclosure provides a magnetic sensor including: a magnetic field detector that includes a magnetic detection element; a first magnetic shield and a second magnetic shield that are disposed so as to sandwich the magnetic field detector therebetween in a first direction; and a third magnetic shield that is disposed on a side of the magnetic field detector in a second direction that is orthogonal to the first direction.

公开(公告)号：US20210302511A1

公开(公告)日：2021-09-30

申请号：US17131142

申请日：2020-12-22

Applicant: TDK CORPORATION

Inventor： Kenzo MAKINO ,  Takafumi KOBAYASHI

IPC: G01R33/09 ,  H01L43/10

Abstract: A magnetic sensor includes an MR element and a support member. A top surface of the support member includes an inclined portion. The MR element includes an MR element main body, a lower electrode, and an upper electrode. The lower electrode includes a first end closest to a lower end of the inclined portion and a second end closest to an upper end of the inclined portion. The MR element main body is located at a position closer to the second end than to the first end.

公开(公告)号：US20150262594A1

公开(公告)日：2015-09-17

申请号：US14204020

申请日：2014-03-11

Applicant: TDK Corporation

Inventor： Susumu AOKI ,  Takafumi KOBAYASHI ,  Ryo HOSOI ,  Kei HIRATA

IPC: G11B5/48 ,  G11B5/245

CPC classification number: G11B5/6088 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/187 ,  G11B5/314 ,  G11B2005/0021

Abstract: The thermally assisted recording head of the present invention has a near field light (NF light) generator that includes a generator end surface facing an air bearing surface (ABS), that generates an NF light on the generator end surface, and that irradiates a magnetic recording medium with the NF light; a main magnetic pole that includes a main magnetic pole end surface facing the ABS and positioned in the vicinity of the generator end surface, and that emits a magnetic flux to the magnetic recording medium from the main magnetic pole end surface; and a return shield that includes a shield end surface facing the ABS and positioned in the vicinity of the generator end surface, that is magnetically linked with the main magnetic pole, and that absorbs a magnetic flux returning from the magnetic recording medium at the shield end surface. The main magnetic pole end surface and the shield end surface are positioned on the same side with respect to the generator end surface in the down track direction, and are positioned in the vicinity of each other in the track crossing direction, and a center line extending in the down track direction of the generator end surface extends between the opposing sides of the main magnetic pole end surface and the shield end surface.

Abstract translation: 本发明的热辅助记录头具有近场光（NF光）发生器，其包括面向空气轴承面（ABS）的发生器端面，其在发电机端面上产生NF光，并且照射磁性 具有NF光的记录介质; 主磁极，其包括面向所述ABS并且位于所述发电机端面附近的主磁极端面，并且从所述主磁极端面向所述磁记录介质发射磁通量; 以及返回屏蔽，其包括面向ABS的屏蔽端面并位于与主磁极磁性连接的发电机端面附近，并且吸收从磁记录介质在屏蔽端返回的磁通量 表面。 主磁极端面和屏蔽端面相对于发生器端面位于沿着轨道方向的同一侧，并且在轨道交叉方向上位于彼此附近，并且中心线延伸 在发电机端面的向下轨道方向上在主磁极端面和屏蔽端面的相对侧之间延伸。

公开(公告)号：US20250003770A1

公开(公告)日：2025-01-02

申请号：US18751399

申请日：2024-06-24

Applicant: TDK Corporation

Inventor： Takehiro ISODA ,  Takafumi KOBAYASHI

IPC: G01D5/16 ,  G02B7/08

Abstract: A magnetic sensor includes a soft magnetic structure including at least one yoke, and magnetoresistive (MR) elements configured to detect a magnetic field generated by the at least one yoke, the MR elements being adjacent to the at least one yoke in a transverse direction of the at least one yoke. The soft magnetic structure further includes at least one additional magnetic body arranged next to the at least one yoke in a longitudinal direction of the at least one yoke and located off the at least one yoke in an orthogonal direction orthogonal to the longitudinal direction.

公开(公告)号：US20240110951A1

公开(公告)日：2024-04-04

申请号：US18538546

申请日：2023-12-13

Applicant: TDK CORPORATION

Inventor： Takafumi KOBAYASHI ,  Norikazu OTA ,  Kenzo MAKINO

IPC: G01R15/20 ,  G01R19/00 ,  G01R33/09

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 effect 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 conductors each have a width smaller than a width of the second conductor or each of the second conductors.

公开(公告)号：US20210293857A1

公开(公告)日：2021-09-23

申请号：US17187966

申请日：2021-03-01

Applicant: TDK CORPORATION

Inventor： Takafumi KOBAYASHI ,  Norikazu OTA ,  Kenzo MAKINO

IPC: G01R15/20 ,  G01R33/09 ,  G01R19/00

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 effect 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 conductors each have a width smaller than a width of the second conductor or each of the second conductors.

公开(公告)号：US20230358827A1

公开(公告)日：2023-11-09

申请号：US18354909

申请日：2023-07-19

Applicant: TDK Corporation

Inventor： Takafumi KOBAYASHI

IPC: G01R33/09 ,  G01R33/00 ,  G01R33/421

CPC classification number: G01R33/093 ,  G01R33/0023 ,  G01R33/4215

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.

公开(公告)号：US20230135336A1

公开(公告)日：2023-05-04

申请号：US18091475

申请日：2022-12-30

Applicant: TDK CORPORATION

Inventor： Kenzo MAKINO ,  Takafumi KOBAYASHI

IPC: G01R33/09 ,  H10N50/85

Abstract: A magnetic sensor includes an MR element and a support member. A top surface of the support member includes an inclined portion. The MR element includes an MR element main body, a lower electrode, and an upper electrode. The lower electrode includes a first end closest to a lower end of the inclined portion and a second end closest to an upper end of the inclined portion. The MR element main body is located at a position closer to the second end than to the first end.

公开(公告)号：US20210293902A1

公开(公告)日：2021-09-23

申请号：US17167581

申请日：2021-02-04

Applicant: TDK CORPORATION

Inventor： Kenzo MAKINO ,  Takafumi KOBAYASHI ,  Hiroshi YAMAZAKI

IPC: G01R33/025 ,  G01R33/09

Abstract: A magnetic sensor device includes a conductor that constitutes a coil, and a detection circuit including a plurality of MR elements. The coil includes an upper coil portion. The upper coil portion includes a first conductor portion and a second conductor portion. An average cross-sectional area of the upper coil portion in the first conductor portion of the upper coil portion is smaller than that of the upper coil portion in the second conductor portion. The first conductor portion is located at a position where a first partial magnetic field occurring from the first conductor portion is applied to an MR element.

公开(公告)号：US20150262595A1

公开(公告)日：2015-09-17

申请号：US14204064

申请日：2014-03-11

Applicant: TDK Corporation

Inventor： Susumu AOKI ,  Takafumi KOBAYASHI ,  Kei HIRATA ,  Eiji KOMURA ,  Tsutomu CHOU

IPC: G11B5/48 ,  G11B5/11 ,  G11B5/60

CPC classification number: G11B5/1278 ,  G11B5/3116 ,  G11B5/314 ,  G11B5/6088 ,  G11B2005/0021 ,  G11B2005/0024

Abstract: A thermally assisted magnetic recording head has a generator end surface facing an air bearing surface (ABS), and includes: a near-field light (NF light) generator that generates an NF light on the generator end surface and irradiates a magnetic recording medium with the NF light, and a main magnetic pole end surface positioned in the vicinity of the generator end surface; a main magnetic pole that emits a magnetic flux from the main magnetic pole end surface to the magnetic recording medium and a shield end surface positioned in the vicinity of the generator end surface; and a return shield that is magnetically linked to the main magnetic pole, and that absorbs the magnetic flux returning from the magnetic recording medium at the shield end surface. The main magnetic pole and the return shield are positioned to be on the same side with respect to the NF light generator in the down track direction, and the NF light generator does not overlap with the main magnetic pole either in the down track direction or in the cross track direction.

Abstract translation: 一种热辅助磁记录头具有面向空气轴承表面（ABS）的发生器端面，并且包括：近场光（NF光）发生器，其在发生器端面上产生NF光并照射磁记录介质 NF灯和位于发电机端面附近的主磁极端面; 从主磁极端面向磁记录介质发出磁通的主磁极和位于发电机端面附近的屏蔽端面; 以及与主磁极磁连接并且在屏蔽端面处吸收从磁记录介质返回的磁通的返回屏蔽。 主磁极和返回屏蔽体相对于NF光发生器沿向下方向位于同一侧，并且NF光发生器在主导方向上或与主磁极不重叠 十字轨道方向。