Taiyo Yuden Co., Ltd.

Atsushi Tanada

Kiyoshi Tanaka

Hideki Ogawa

Hitoshi Matsuura

Hiroshi Kishi

Kenji Kawano

Hirokazu Chazono

Chie Kawamura

Kenji Otake

Masahiro Hachiya

Tetsuyuki Suzuki

Yoko Orimo

Toshimasa Suzuki

Kenji Takashima

Kinshiro Takadate

Kengo Tsuchiya

A composite magnetic body according to one aspect of the present invention includes a first metal magnetic particle covered with a first resin portion made of a first resin material and a second metal magnetic particle having a smaller particle size than the first metal magnetic particle, where the second metal magnetic particle is bound to the first metal magnetic particle via a second resin portion made of a second resin material, the second resin material having a softening point higher than the first resin material.

Composite magnetic particle including metal magnetic particle

A coil component includes: a magnetic base body formed by metal magnetic grains containing Fe, Si, and Cr, whose intensity ratio (I/I) of the strongest line intensity (I) in a range of wavenumbers 650 to 750 cm, to the strongest line intensity (I) in a range of wavenumbers 400 to 450 cm, in a Raman spectrum measured at the center part is 2 or higher, and which also has a part on the surface side of the center part where the intensity ratio (I/I) in a Raman spectrum is under 2; and a conductor placed inside or on the surface of the magnetic base body. The magnetic base body is constituted by a powder magnetic core made to have excellent electrical insulating property and high magnetic permeability.

Coil component and circuit board having same

One aspect of the present invention is a coil component comprising: a magnetic substrate formed with magnetic metal particles containing Fe, Si and Cr, and a bonding layer containing oxygen and nitrogen that bonds the magnetic metal particles to each other; and a conductor arranged inside or on the surface of the magnetic substrate.

Coil component and method for manufacturing same

A winding-type coil component whose core member is constituted by: soft magnetic alloy grainscontaining Fe, Si, and at least one of Cr and Al, as constituent elements; and an oxide layerwhich is formed around the soft magnetic alloy grains to bond the soft magnetic alloy grains together and contains Si, as well as at least one of Cr and Al, as constituent elements, and whose content of Si based on mass is higher than the total content of Cr and Al. The winding-type coil component has high mechanical strength.

Winding-type coil component and method for manufacturing same, as well as circuit board carrying winding-type coil component

A composite magnetic body according to one aspect of the present invention includes a first metal magnetic particle covered with a first resin portion made of a first resin material and a second metal magnetic particle having a smaller particle size than the first metal magnetic particle, where the second metal magnetic particle is bound to the first metal magnetic particle via a second resin portion made of a second resin material and the second resin material has a larger molecular weight than the first resin material.

A magnetic body constituted by magnetic grains bonded together via oxide film, which magnetic grains contain a Fe&#x2014;Si-M soft magnetic alloy (where M is a metal element more easily oxidized than Fe) that contains sulfur atoms (S). The magnetic body preferably contains 0.004 to 0.012 percent by weight of S, 1.5 to 7.5 percent by weight of Si, and 2 to 8 percent by weight of metal M.

Magnetic body and electronic component using the same

In some embodiments, a magnetic bodyhas soft magnetic alloy grainsthat contain Fe, M (M is a metal element that oxidizes more easily than Fe), and S, as well as oxide filmsproduced by partial oxidization of the soft magnetic alloy grains, wherein the magnetic bodyhas its adjacent soft magnetic alloy grainsbonded together at least partially through the oxide films, and contains Fe by 92.5 to 96 percent by weight and S by 0.003 to 0.02 percent by weight. The magnetic body can have high levels of both magnetic permeability and volume resistivity, to meet the demand for smaller, higher-performance electronic components.

Magnetic body and electronic component comprising the same

In an embodiment, a magnetic body includes: multiple soft magnetic alloy grainseach containing Fe, element L (where element L is Si, Zr or Ti), and element M (where Element M is an element other than Si, Zr, and Ti, and which oxidizes more easily than Fe); oxide filmscovering the soft magnetic alloy grains, respectively; a bonding materialconstituted by an oxide that exists separately from the oxide films(A,B),(A,B); first bonds where adjacent soft magnetic alloy grainsare bonded together via the oxide filmsand second bonds where adjacent soft magnetic alloy grainsare bonded together via the bonding materialwithout the oxide filmsthat respectively cover these grains making direct contact with each other.

Magnetic body and coil component using the same

A coil component having a magnetic material and a coil formed on a surface of or inside the magnetic material. The magnetic material is constituted by a grain compact formed by compacting multiple metal grains that in turn are constituted by an Fe&#x2014;Si&#x2014;M soft magnetic alloy (where M is a metal element that oxidizes more easily than Fe), wherein individual metal grains have oxide film formed at least partially around them; the grain compact is formed primarily via bonding between oxide films formed around adjacent metal grains; and the apparent density of the grain compactis 5.2 g/cmor more, or preferably 5.2 to 7.0 g/cm.

Magnetic material and coil component employing same

A magnetic material constituted by a grain compactobtained by shaping metal grainsand then heat-treating them in an oxidizing ambience, wherein the metal grainsare made of a Fe&#x2014;Cr&#x2014;Si alloy and their Fe/(Fe+Fe) ratio as measured before shaping by XPS, with respect to the sum of integral values at the peaks of 709.6 eV, 710.7 eV and 710.9 eV, or Fe, and peak integral value at 706.9 eV, or Fe, is 0.2 or more.

Magnetic material and coil component using the same

A coil-type electronic component having a coil inside or on the surface of a base material is characterized in that the base material of the coil-type electronic component is constituted by a group of soft magnetic alloy grains inter-bonded via oxide layers, multiple crystal grains are present in each soft magnetic alloy grain, and the oxide layers preferably have a two-layer structure whose outer layer is thicker than the inner layer.

Coil-type electronic component

A coil-type electronic component having a coil inside or on the surface of a base material, characterized in that the base material of the coil-type electronic component is constituted by a group of soft magnetic alloy grains whose main ingredients are iron, silicate and chromium, and that an oxide layer is formed on the surface of each soft magnetic alloy grain, where the oxide layer is produced as a result of oxidization of the grain and has more chromium than the alloy grain, and this oxide layer has a two-layer structure constituted by an inner layer whose main ingredient is chromium oxide and an outer layer whose main ingredient is iron-chromium oxide, and the outer layers of soft magnetic alloy grains are inter-bonded.

A coil-type electronic component has a coil inside or on the surface of its base material and is characterized in that: the base material is constituted by a group of grains of a soft magnetic alloy containing iron, silicon and other element that oxidizes more easily than iron; the surface of each soft magnetic alloy grain has an oxide layer formed on its surface as a result of oxidization of the grain; this oxide layer contains the other element that oxidizes more easily than iron by a quantity larger than that in the soft magnetic alloy grain; and grains are bonded with one another via this oxide layer.

Method for manufacturing a coil-type electronic component

A coil-type electronic component has a coil inside or on the surface of its base material wherein the base material in the coil-type electronic component is constituted by a group of grains of a soft magnetic alloy containing iron, silicon and other element that oxidizes more easily than iron; the surface of each soft magnetic alloy grain has an oxide layer formed on its surface as a result of oxidization of the grain; this oxide layer contains the other element that oxidizes more easily than iron by a quantity larger than that in the soft magnetic alloy grain; and grains are bonded with one another via this oxide layer. The coil-type electronic component can be produced at low cost and combines high magnetic permeability with high saturation magnetic flux density.

Coil-type electronic component and process for producing same

A coil-type electronic component has a coil inside or on an outer surface of its base material and is characterized in that: the base material is constituted by a group of grains of a soft magnetic alloy containing iron, silicon and other element that oxidizes more easily than iron; the surface of each soft magnetic alloy grain has an oxide layer formed on its surface as a result of oxidization of the grain; the oxide layer contains the other element that oxidizes more easily than iron by a quantity larger than that in the soft magnetic alloy grain; and grains are bonded with one another via the oxide layer.

Growing community of inventors

Takasaki, Japan

Atsushi Tanada