Toda Kogyo Corporation

Yoji Okano

Hiromitsu Misawa

Kazuo Fujioka

Koso Aoki

Eiichi Kurita

Minoru Kozawa

Tomohiro Dote

Takanori Doi

Kazumi Yamamoto

Yasuhiko Fujii

Tetsuya Kimura

Makoto Sadai

Naoki Uchida

Norio Sugita

Shingo Honda

Akihiro Yoshida

Akihisa Kajiyama

Yoshiro Sato

Tatsuya Nakamura

Yasushi Nishio

Hiromitsu Sakurai

Yuji Omote

Katsumi Nakai

Kazuyoshi Kawato

Kazushi Nishimoto

Takayuki Yoshida

Mitsunori Kurumada

In accordance with the present invention, there is provided a noise suppression sheet that is capable of absorbing noise at a wide frequency range of from 10 MHz to 1 GHz. The present invention relates to a ferrite laminate formed by laminating a conductive layer comprising a conductive filler and a resin and a magnetic layer comprising ferrite; the conductive layer has a surface electrical resistance of of 100 to 5000 &#x3a9;/&#x25a1;; the ferrite is partitioned into small parts; and a real part of a magnetic permeability of the ferrite as measured at 10 MHz is 130 to 480, and an imaginary part of of the magnetic permeability of the ferrite as measured at 10 MHz is 30 to 440.

Ferrite laminate and noise suppression sheet

The present invention relates to a ferrite sintered plate having a composition comprising 47 to 50 mol % of FeO, 7 to 26 mol % of NiO, 13 to 36 mol % of ZnO, 7 to 12 mol % of CuO and 0 to 1.5 mol % of CoO, as calculated in terms of the respective oxides, in which the ferrite sintered plate has a volume resistivity of 1&#xd7;10to 1&#xd7;10&#xb7;cm and a thickness of 10 to 60 &#x3bc;m; and a ferrite sintered sheet comprising the ferrite sintered plate on a surface of which a groove or grooves are formed, and an adhesive layer and/or a protective layer formed on the ferrite sintered plate, in which the ferrite sintered sheet has a magnetic permeability at 500 kHz a real part of which is 120 to 800 and an imaginary part of which is 0 to 30, and a product (&#x3bc;m) of the real part of the magnetic permeability at 500 kHz of the ferrite sintered sheet and a thickness of the ferrite sintered plate is 5000 to 48000. The ferrite sintered plate and the ferrite sintered sheet according to the present invention have a high volume resistivity as well as a large &#x3bc;' value and a small &#x3bc;&#x2033; value of a magnetic permeability thereof, and therefore can be suitably used as a shielding plate in a digitizer system.

Ferrite sintered plate and ferrite sintered sheet

An object or technical task of the present invention is to provide a ferrite sintered sheet having a dense ferrite microfine structure which has a large &#x3bc;' value, a small &#x3bc;&#x2033; value, and a small temperature-dependent change of the &#x3bc;&#x2032; value thereof. The present invention relates to a ferrite ceramics having a composition comprising 47.5 to 49.8 mol % of FeO, 13.5 to 19.5 mol % of NiO, 21 to 27 mol % of ZnO, 7.5 to 12.5 mol % of CuO and 0.2 to 0.8 mol % of CoO, all of the molar amounts being calculated in terms of the respective oxides, the ferrite ceramics further comprising 0.2 to 1.4% by weight of SnOand 0.005 to 0.03% by weight of S and having a density of 5.05 to 5.30 g/cm; and a ferrite sintered sheet comprising the ferrite sintered plate on a surface of which a groove or grooves are formed, and an adhesive layer and/or a protective layer formed on the ferrite sintered plate.

Ferrite ceramics, ferrite sintered plate and ferrite sintered sheet

The present invention relates to an Ni&#x2014;Zn&#x2014;Cu&#x2014;Co ferrite sintered plate having a composition comprising 45 to 50 mol % of FeO, 10 to 25 mol % of NiO, 15 to 36 mol % of ZnO, 2 to 14 mol % of CuO and 0.1 to 3.5 mol % of CoO, all of the molar amounts being calculated in terms of the respective oxides, and a ferrite sintered sheet that is provided on a surface thereof with a groove and further with an adhesive layer and/or a protective layer. The ferrite sintered sheet is capable of exhibiting an increased &#x3bc;' value of a magnetic permeability while maintaining a small &#x3bc;&#x2033; value of the magnetic permeability.

An object of the present invention is to provide a ferrite material that is excellent in temperature characteristic and DC superimposition characteristic. The present invention relates to Ni&#x2014;Zn&#x2014;Cu-based ferrite particles comprising 70 to 95% by weight of an Ni&#x2014;Zn&#x2014;Cu ferrite having a specific composition, 1 to 20% by weight of nickel oxide, 0 to 20% by weight of zinc oxide and 1 to 10% by weight of copper oxide, and a ferrite sintered ceramics obtained by sintering the ferrite particles.

Ni&#x2014;Zn&#x2014;Cu-based ferrite particles, green sheet comprising the Ni&#x2014;Zn&#x2014;Cu-based ferrite particles and Ni&#x2014;Zn&#x2014;Cu-based ferrite sintered ceramics

The present invention relates to a folded dipole antenna comprising a magnetic material comprising a hexagonal Z-type ferrite and/or a hexagonal Y-type ferrite as a main component in which a radiation element and a reflection element each having a folded dipole structure are disposed, and an RF tag comprising the folded dipole antenna and an IC chip connected to the folded dipole antenna. The RF tag according to the present invention has a smaller size than that of the conventional RF tags and is not susceptible to adverse influence from ambient environments, and can be operated at an UHF band or surrounding frequency bands thereof.

Folded dipole antenna and RF tag using the folded dipole antenna

The present invention relates to a molded ferrite sheet having opposing surfaces and a thickness in a range of 30 &#x3bc;m to 430 &#x3bc;m, at least one surface of said opposing surfaces having the following surface roughness characteristics (a) to (c):

Molded ferrite sheet, sintered ferrite substrate and antenna module

A Ni&#x2014;Zn&#x2014;Cu ferrite material having excellent DC bias characteristics is provided by adding zinc silicate thereto. The above problem can be solved by Ni&#x2014;Zn&#x2014;Cu ferrite particles which comprise a spinel-type ferrite and zinc silicate, which have a composition comprising 36.0 to 48.5 mol % of FeO, 7.0 to 38 mol % of NiO, 4.5 to 40 mol % of ZnO, 5.0 to 17 mol % of CuO and 1.0 to 8.0 mol % of SiO, all amounts being calculated in terms of the respective oxides, and which have a ratio of an X-ray diffraction intensity from a 113 plane of the zinc silicate to an X-ray diffraction intensity from a 311 plane of the spinel-type ferrite is 0.01 to 0.12; a green sheet obtained by forming a material comprising the Ni&#x2014;Zn&#x2014;Cu ferrite particles into a film; and a Ni&#x2014;Zn&#x2014;Cu ferrite sintered ceramics.

Ni&#x2014;Zn&#x2014;Cu ferrite particles, green sheet comprising the Ni&#x2014;Zn&#x2014;Cu ferrite particles and Ni&#x2014;Zn&#x2014;Cu ferrite sintered ceramics

Soft-magnetic hexagonal ferrite composite particles composed of 100 parts by weight of soft-magnetic hexagonal ferrite particles containing a Z-type ferrite, Y-type ferrite or W-type ferrite as a main phase, 0.3 to 10 parts by weight of barium carbonate particles, strontium carbonate particles or their mixture and 0.1 to 5 parts by weight of silicon dioxide particles.

Soft-magnetic hexagonal ferrite composite particles, and green sheet using the same and soft-magnetic hexagonal ferrite sintered ceramics

The present invention provides a hollow shape strontium iron oxide particle powder. Not only is the particle powder high in safety and excellent in workability, but exhibits a large dielectric constant when formed into an artificial dielectric material utilizing electrical conduction by being dispersed in an organic medium such as a rubber.

Strontium iron oxide particle powder and process for producing the same

Disclosed herein is iron oxide particles comprising:

Iron oxide particles and process for producing the same

The disclosure describes coated granular magnetite particles comprising:

Coated granular magnetite particles and process for producing the same

Magnetic toner particles composed of magnetite core particles containing 0.10 to 1.00 wt % silicon and a hydrous coprecipiate of silica and alumina deposited or adhered on the surfaces of the magnetite core particles. The magnetic toner particles have an area-average diameter of 0.05 to 1.0 .mu.m.

Magnetic particles comprising magnetite core and process for producing

Granular magnetite particles useful as coloring pigments assuming a black color and containing elemental aluminum, 3 to 6 wt %, in the magnetite crystal lattice. The magnetite has a spinel structure with a lattice constant of 8.340 to 8.375 .ANG..

Growing community of inventors

Otake, Japan

Yoji Okano