Murata Manufacturing Co., Ltd.

Murata Manufacturingco., Ltd.

Takuya Ishida

Gota Shinohara

Mitsuru Odahara

Shinya Hirai

Makoto Yamamoto

Yuya Ishida

Yoshifumi Maki

Katsutoshi Uji

Mikito Sugiyama

Hideaki Ooi

Akio Igarashi

Koji Onishi

Yuuji Igarashi

Yoshiharu Satou

Koichi Ida

Takao Miyamoto

Hirotsugu Tomioka

Daisuke Katayama

Sumie Arai

Kohei Kobayashi

Takao Kawachi

A metal magnetic particle provided with an oxide layer on a surface of an alloy particle containing Fe and Si. The oxide layer has a first oxide layer, a second oxide layer, a third oxide layer, and a fourth oxide layer. Also, in line analysis of element content by using a scanning transmission electron microscope-energy dispersive X-ray spectroscopy, the first oxide layer is a layer where Fe content takes a local maximum value, the second oxide layer is a layer where Fe content takes a local maximum value, the third oxide layer is a layer where Si content takes a local maximum value, and the fourth oxide layer is a layer where Fe content takes a local maximum value.

Metal magnetic particle, inductor, method for manufacturing metal magnetic particle, and method for manufacturing metal magnetic core

A metal magnetic particle provided with an oxide layer on a surface of an alloy particle containing Fe and Si. The oxide layer has a first oxide layer, a second oxide layer, and a third oxide layer from a side of the alloy particle. All of the first oxide layer, the second oxide layer, and the third oxide layer contain Si. Also, in line analysis of element content by using a scanning transmission electron microscope-energy dispersive X-ray spectroscopy, the first oxide layer is a layer having Fe content smaller than Si content in the alloy particle, the second oxide layer is a layer having Fe content larger than the Si content in the alloy particle, and the third oxide layer is a layer having Fe content smaller than the Si content in the alloy particle.

Advantage is taken of the fact that tin has a higher efficiency of absorption of a laser beam than, for example, copper. A method of manufacturing a coil component includes preparing a wire that includes a linear, central conductor and an insulating coating that covers a circumferential surface of the central conductor, preparing a metal terminal that is to be electrically connected to the central conductor at an end portion of the wire and that has a surface on which a tin-containing film that contains tin is disposed and above which at least the end portion of the wire is to be disposed, and welding the central conductor of the wire to the metal terminal by irradiating at least the tin-containing film with a laser beam with the end portion of the wire disposed along the tin-containing film.

Method of manufacturing a coil component

A metal magnetic particle provided with an oxide layer on a surface of an alloy particle containing Fe and Si, wherein the oxide layer has a first oxide layer, a second oxide layer, and a third oxide layer from the alloy particle side. Also, in line analysis of element content by using a scanning transmission electron microscope-energy dispersive X-ray spectroscopy, the first oxide layer is a layer where Si content takes a local maximum value, the second oxide layer is a layer where Fe content takes a local maximum value, and the third oxide layer is a layer where Si content takes a local maximum value.

An inductor is provided so that reduction in DC superposition characteristics can be suppressed even when a filling rate of a magnetic powder is increased. The inductor includes a coil including a winding portion and a pair of extended portions extended from the winding portion, and a body having the coil embedded therein and containing a magnetic powder containing a first magnetic powder and a second magnetic powder, in which an average particle diameter of the first magnetic powder is larger than an average particle diameter of the second magnetic powder. In a cross section of the body including a winding axis of the winding portion and extending in a long side direction of the body, Voronoi partition is performed with a center of gravity of each magnetic powder as a generating point. When a standard deviation of an area of a Voronoi partition region with a magnetic powder having a particle diameter of equal to or more than 6 μm as a generating point is calculated, the standard deviation is equal to or less than 300.

Inductor

A method of manufacturing an electronic component capable of preventing entrance of a plating solution and a flux component at an interface to which an inner electrode of a ceramic element body is extended, and capable of forming an outer electrode of an arbitrary shape. A ceramic element body is made of a ceramic material containing a metal oxide, and part of an inner electrode is extended to extended surfaces of the ceramic element body. A base electrode is formed on each of the extended surfaces using a conductive paste to be connected to the inner electrode. Part of another surface of the ceramic element body adjacent to the extended surfaces is locally heated, and part of the metal oxide is reduced to form a reformed portion. A plating electrode is continuously formed over the base electrode and the reformed portion through a plating method to form outer electrodes.

Method of manufacturing electronic component and electronic component

A magnetic composite contains metal magnetic particles and a resin. The metal magnetic particles contain at least one Fe-containing crystalline material, and [Formula 1]Bs×α×{log(γ×1/D+δ×Bs+ε)}{circumflex over ( )}β≥13T, where Bs and D are the saturation flux density in T and the median diameter of crystallites in μm, respectively, of the crystalline material, α=14.3, β=−0.67, γ=752, δ=512, and ε=−815.

Magnetic composite

A magnetic material and an inductor capable of attaining both higher magnetic permeability and improved DC superposition characteristics. A composite magnetic material contains metal magnetic particles, in which the metal magnetic particles include first particles having a median diameter Dof 1.3 μm or more and 5.0 μm or less (i.e., from 1.3 μm to 5.0 μm), and second particles having a median diameter Dlarger than the first particles. The first and second particles each include a core portion made of a metal magnetic material, and an insulating film provided on a surface of the core portion. The insulating film of the second particles has an average thickness of 40 nm or more and 100 nm or less (i.e., from 40 nm to 100 nm). The insulating film of the first particles has an average thickness smaller than that of the insulating film of the second particles.

Composite magnetic material and inductor using the same

A coil component includes a magnetic portion that includes metal particles and a resin material, a coil conductor embedded in the magnetic portion, and outer electrodes electrically connected to the coil conductor. The average particle diameter of the metal particles in the magnetic portion is 1 &#x3bc;m or more and 5 &#x3bc;m or less, and the CV value of the metal particles is 50% or more and 90% or less.

Coil component

A coil component includes a magnetic portion that includes metal particles and a resin material, a coil conductor embedded in the magnetic portion and having a core portion, and outer electrodes electrically connected to the coil conductor. The magnetic portion includes a magnetic outer coating and a magnetic base having a protrusion portion. The coil conductor is disposed on the magnetic base such that the protrusion portion is located in the core portion. The magnetic outer coating is disposed so as to cover the coil conductor, and the bottom surface of the magnetic base includes a recessed portion in an area opposite to the protrusion portion.

Coil component magnetic base

A magnetic material and an inductor capable of attaining both higher magnetic permeability and improved DC superposition characteristics. A composite magnetic material contains metal magnetic particles, in which the metal magnetic particles include first particles having a median diameter Dof 1.3 &#x3bc;m or more and 5.0 &#x3bc;m or less (i.e., from 1.3 &#x3bc;m to 5.0 &#x3bc;m), and second particles having a median diameter Dlarger than the first particles. The first and second particles each include a core portion made of a metal magnetic material, and an insulating film provided on a surface of the core portion. The insulating film of the second particles has an average thickness of 40 nm or more and 100 nm or less (i.e., from 40 nm to 100 nm). The insulating film of the first particles has an average thickness smaller than that of the insulating film of the second particles.

An adhesive layer is in contact with a rising portion of a metal terminal and an outer end surface of a flange portion of a drum-shaped core. A surface of the rising portion that faces the outer end surface is an inclined surface that inclines with respect to the outer end surface. The thickest portion of the adhesive layer is located near a position at which a distance between the inclined surface and the outer end surface is largest. The thickness of the thickest portion of the adhesive layer is 13 &#x3bc;m or more.

Growing community of inventors

Nagaokakyo, Japan

Takuya Ishida