公开(公告)号：US20210090768A1

公开(公告)日：2021-03-25

申请号：US17026848

申请日：2020-09-21

Applicant: TDK Corporation

Inventor： Tomokazu ISHIKURA ,  Masanori IKEDA ,  Yoshitaka MURAKAWA ,  Hiroyuki MORITA ,  Shogo MUROYA

IPC: H01F1/11 ,  C04B35/26

Abstract: The present invention provides a ferrite sintered magnet comprising ferrite crystal grains having a hexagonal structure, wherein the ferrite sintered magnet comprises metallic elements at an atomic ratio represented by formula (1). In formula (1), R is at least one element selected from the group consisting of Bi and rare-earth elements, and R comprises at least La. In formula (1), w, x, z and m satisfy formulae (2) to (5). The above-mentioned ferrite sintered magnet further has a coefficient of variation of a size of the crystal grains in a section parallel to a c axis of less than 45%. Ca1-w-xRwSrxFezCom  (1) 0.360≤w=0.420  (2) 0.110≤x≤0.173  (3) 8.51≤z≤9.71  (4) 0.208≤m≤0.269  (5)

公开(公告)号：US20230280296A1

公开(公告)日：2023-09-07

申请号：US18176414

申请日：2023-02-28

Applicant: TDK CORPORATION

Inventor： Nishit GOEL ,  Stephen BART ,  Raitaro MASAOKA ,  Kazutaka FUJITA ,  Tomokazu ISHIKURA

IPC: G01N27/12

CPC classification number: G01N27/128

Abstract: A sensor including a micro-bridge structure, wherein the micro-bridge structure comprises a concave geometry, a first electrode on a surface of the micro-bridge structure, a second electrode on the surface of the micro-bridge structure, and a chemical sensing material coupled to the micro-bridge structure overlying the first electrode and the second electrode and exposed to an environment. The chemical sensing material overlays the first electrode and the second electrode and is within the concave geometry of the micro-bridge structure such that the chemical sensing material settles into the concave geometry of the micro-bridge structure during fabrication of the sensor, and wherein the chemical sensing material has an electrical resistance responsive to a concentration of gas in the environment.

公开(公告)号：US20240159700A1

公开(公告)日：2024-05-16

申请号：US17984758

申请日：2022-11-10

Applicant: TDK CORPORATION

Inventor： Tomokazu ISHIKURA ,  Kazutaka FUJITA ,  Raitaro MASAOKA

IPC: G01N27/12

CPC classification number: G01N27/125

Abstract: A metal oxide semiconductor gas sensor includes a first electrode, a second electrode, and a sensing layer in contact with the first electrode and the second electrode. The sensing layer includes SnO2 and WO3. A cross section of the sensing layer has an average porosity of 16.0% or more and 22.0% or less. SnO2 occupies 60 vol % or more and 80 vol % or less and WO3 occupies 20 vol % or more and 40 vol % or less in the sensing layer provided that pores are not counted as part of the sensing layer.

公开(公告)号：US20210118598A1

公开(公告)日：2021-04-22

申请号：US17070469

申请日：2020-10-14

Applicant: TDK Corporation

Inventor： Yoshitaka MURAKAWA ,  Hiroyuki MORITA ,  Masanori IKEDA ,  Shogo MUROYA ,  Tomokazu ISHIKURA

IPC: H01F1/03 ,  H01F1/08 ,  H01F1/11

Abstract: A ferrite sintered magnet 100 comprises M-type ferrite crystal grains 4 and multiple-crystal grain boundaries 6b surrounded by three or more of the M-type ferrite crystal grains 4. The ferrite sintered magnet 100 contains at least Fe, Ca, B, and Si, and contains 0.005 to 0.9 mass % of B in terms of B2O3. The multiple-crystal grain boundaries 6b contain Si and Ca, and in a case where the molar ratio of Ca to Si in the multiple-crystal grain boundaries 6b is represented by (Ca/Si)G, the following formula is satisfied. 0.1

公开(公告)号：US20220324721A1

公开(公告)日：2022-10-13

申请号：US17678086

申请日：2022-02-23

Applicant: TDK CORPORATION

Inventor： Tomokazu ISHIKURA ,  Raitaro MASAOKA

IPC: C01G49/00 ,  G01N27/12 ,  G01N33/00

Abstract: A sensing material for detecting hydrogen sulfide capable of detecting hydrogen sulfide even having a low concentration, a hydrogen sulfide-sensitive layer containing the sensing material for detecting hydrogen sulfide, and a metal oxide semiconductor-type gas sensor having the hydrogen sulfide-sensitive layer are provided. The sensing material for detecting hydrogen sulfide includes CuFe2O4-type complex oxide (W). The CuFe2O4-type complex oxide (W) contains, as a main component (W1), 35.0 to 49.5 mol % of iron oxide in terms of Fe2O3 and 50.5 to 65 mol % of copper oxide in terms of CuO, and an average particle diameter of particles is 3 μm or less.

公开(公告)号：US20150180128A1

公开(公告)日：2015-06-25

申请号：US14555159

申请日：2014-11-26

Applicant: TDK CORPORATION

Inventor： Tomokazu ISHIKURA ,  Shin TAKANE ,  Norizumi ASANO ,  Kosuke KUNITSUKA

IPC: H01Q7/06 ,  H01F1/01

CPC classification number: H01Q7/06 ,  C04B35/26 ,  C04B35/638 ,  C04B2235/3232 ,  C04B2235/3277 ,  C04B2235/3279 ,  C04B2235/3281 ,  C04B2235/3284 ,  C04B2235/6562 ,  C04B2235/72 ,  G06K19/07771 ,  H01F1/344 ,  H01Q1/2225

Abstract: An object is to provide a ferrite composition suitable for an antenna element with a long communication distance in a high-frequency band (for example, 13.56 MHz), a ferrite plate formed of the ferrite composition, a magnetic member for an antenna element formed of the ferrite plate, and an antenna element provided with a member for an antenna element. A ferrite composition, wherein: main components contain, with Fe2O3 conversion, 45.0-49.5 mol % of iron oxide, with CuO conversion, 4.0-16.0 mol % of copper oxide, with ZnO conversion, 19.0-25.0 mol % of zinc oxide, a remaining portion is constituted by nickel oxide, an inevitable impurity is removed with respect to the main components, and as accessory components, with TiO2 conversion, 0.5-2 weight % of titanium oxide, with CuO conversion, 0.35-2 weight % of cobalt oxide are contained.

Abstract translation: 本发明的目的是提供一种适用于在高频带（例如，13.56MHz）具有长通信距离的天线元件的铁氧体组合物，由铁氧体组合物形成的铁氧体板，用于天线元件的磁性构件，由 铁氧体板和设置有天线元件的天线元件。 一种铁素体组合物，其中主要成分含有Fe 2 O 3转化率为45.0〜49.5摩尔％的氧化铁，CuO转化率为4.0〜16.0摩尔％，氧化铜为ZnO，ZnO为19.0〜25.0摩尔，氧化锌为19.0〜25摩尔％ 剩余部分由氧化镍构成，相对于主要成分除去不可避免的杂质，作为辅助成分，使用TiO 2转化率为0.5〜2重量％的氧化钛，CuO转化率为0.35〜2重量％的氧化钴 被包含。