公开(公告)号：US20220317210A1

公开(公告)日：2022-10-06

申请号：US17847694

申请日：2022-06-23

Applicant: TDK Corporation

Inventor： Yuta SAITO ,  Yoshihiro KUDO ,  Daisuke MIYAUCHI ,  Satoshi ABE

IPC: G01R33/09 ,  G01R1/20 ,  G01R15/20

Abstract: The current sensor comprises: a magnetic detecting device that is arranged in the vicinity of a conductor, to which a magnetic field to be measured induced by a current flowing through the conductor is applied, and that changes an electrical resistance in response to a change in the magnetic field to be measured; two coils that generate a canceling magnetic field to cancel the magnetic field to be measured and that are arranged in the vicinity of the magnetic detecting device; a shunt resistor, that is connected in series between the two coils, for detecting a current flowing through the coils; a first differential amplifier that amplifies the output signal of the magnetic detecting device and that supplies the current to induce the canceling magnetic field to the coils; and a second differential amplifier that amplifies the voltage across the shunt resistor and that outputs a measured voltage proportional to the current flowing through the conductor.

公开(公告)号：US20210239774A1

公开(公告)日：2021-08-05

申请号：US17155307

申请日：2021-01-22

Applicant: TDK Corporation

Inventor： Yuta SAITO ,  Yoshihiro KUDO ,  Daisuke MIYAUCHI ,  Satoshi ABE

IPC: G01R33/09 ,  G01R15/20 ,  G01R1/20

Abstract: The current sensor comprises: a magnetic detecting device that is arranged in the vicinity of a conductor, to which a magnetic field to be measured induced by a current flowing through the conductor is applied, and that changes an electrical resistance in response to a change in the magnetic field to be measured; two coils that generate a canceling magnetic field to cancel the magnetic field to be measured and that are arranged in the vicinity of the magnetic detecting device; a shunt resistor, that is connected in series between the two coils, for detecting a current flowing through the coils; a first differential amplifier that amplifies the output signal of the magnetic detecting device and that supplies the current to induce the canceling magnetic field to the coils; and a second differential amplifier that amplifies the voltage across the shunt resistor and that outputs a measured voltage proportional to the current flowing through the conductor.

公开(公告)号：US20160019922A1

公开(公告)日：2016-01-21

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

IPC: G11B5/60

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。

公开(公告)号：US20150294678A1

公开(公告)日：2015-10-15

申请号：US14250522

申请日：2014-04-11

Applicant: TDK Corporation

Inventor： Shinji HARA ,  Eiji KOMURA ,  Norikazu OTA ,  Daisuke MIYAUCHI ,  Tetsuya ROPPONGI ,  Koji SHIMAZAWA

IPC: G11B5/48 ,  G11B5/60 ,  G11B5/31

CPC classification number: G11B13/08 ,  G11B5/3106 ,  G11B5/314 ,  G11B5/3163 ,  G11B5/6076 ,  G11B5/6082 ,  G11B5/6088 ,  G11B7/1387 ,  G11B2005/0021

Abstract: A thermal assisted magnetic recording head has a magnetic head slider having an air bearing surface that is opposite to a magnetic recording medium, a core that can propagate laser light as propagating light, a plasmon generator that includes a generator front end surface facing the air bearing surface, and a main pole facing the air bearing surface, and a laser light generator that supplies the laser light to the core. The plasmon generator generates near-field light (NF light) at the generator front end surface to heat the magnetic recording medium. The main pole includes a main pole end surface that faces the air bearing surface and that is positioned in the vicinity of the generator front end surface, and emits a magnetic flux to the magnetic recording medium from the main pole end surface. At least a portion of the laser light that is not coupled with the plasmon generator thermally deforms the air bearing surface so that a part of the air bearing surface positioned closer to the leading side than the generator front end surface and the main pole end surface in the down track direction protrudes toward the magnetic recording medium.

Abstract translation: 热辅助磁记录头具有磁头滑块，其具有与磁记录介质相反的空气轴承表面，可以传播激光作为传播光的芯，等离子体激元发生器，其包括面向空气轴承的发生器前端表面 表面和面向空气轴承表面的主极;以及激光发生器，其将激光供应到芯。 等离子体发生器在发生器前端表面产生近场光（NF光），以加热磁记录介质。 主极包括面向空气轴承表面并且位于发生器前端表面附近的主极端面，并且从主极端面向磁记录介质发射磁通量。 不与等离子体发生器耦合的激光的至少一部分使空气轴承表面发生热变形，使得空气轴承表面的一部分比发生器前端表面和主极端表面更靠近前端 向下轨道方向朝向磁记录介质突出。