Murata Manufacturing Co., Ltd.

Hiroyuki Takeuchi

Motoi Nishii

Yoshihiro Nishinaga

Naotaka Oiwa

Kazutaka Nakamura

Katsuhisa Imada

Minoru Tamada

Tomoaki Ushiro

Toshio Kawabata

Takashi Kobayashi

Hisashi Katsurada

Yoshiyuki Hatsuda

Masaharu Ikeda

Yoshifumi Yamanaka

A method for producing a multi-layered chip inductor includes the steps of: forming coil-shaped internal conductors inside a green ceramic laminate, each of which coil-shaped internal conductors is spiralled around an axial line in the laminating direction of the green ceramic laminate; applying an external electrode paste onto at least one laminating-direction surface of the green ceramic laminate, which external electrode paste connects to an end of the coil-shaped internal conductor; cutting the green ceramic laminate along the laminating direction into chip-shaped-green ceramic laminates each having the coil-shaped internal conductor inside; and firing each of the chip-shaped green ceramic laminates and baking the external electrode paste to form an external electrode.

Method for producing multi-layered chip inductor

A method is provided for manufacturing a multilayer-type chip inductor having a small DC resistance without decreasing the inductance or the impedance. The method of manufacturing a multilayer-type chip inductor includes the steps of: preparing a ceramic green sheet; forming an electrode film on one surface of the green sheet; multilayering a plurality of the green sheets in such a way that the surfaces on which electrode films are formed face each other for pairs of the green sheets; contact-bonding the green sheets; and sintering the green sheets.

Method of manufacturing multilayer-type chip inductors

In a laminated inductor array, four spiral inductors are aligned from the left end surface to the right end surface of a laminated body. In the direction of alignment of the spiral inductors, the number of the coil conductors on the side portion of the left end surface of the inductor located close to the left end portion of the laminated body and the number of the coil conductors on the side portion of the right end surface of the inductor located close to the right end portion of the laminated body are the same.

Laminated inductor array

When a plurality of devices are disposed in parallel in a magnetic ceramic laminated member to form a complex electronic component, an insulating member is disposed between adjacent devices. When adjacent devices among a plurality of devices are disposed on different planes in a magnetic ceramic laminated member to form a complex electronic component, an insulating member is disposed at least at a part of an intermediate layer positioned between the adjacent devices in the lamination direction.

Complex electronic component

A multi-layered inductor array is constructed to reduce and minimize variations in the inductance values and DC resistance values of a plurality of inductors contained in a multi-layered structure. In this multi-layered inductor array, four spiral inductors having an equal number of winding turns are aligned from the left end surface of the multi-layered structure to the right end surface thereof. In the direction in which the four spiral inductors are aligned, the lengths of the spiral portions of the inductors positioned at the central portion of the multi-layered structure are greater than those of the spiral portions of the spiral inductors positioned at both end portions thereof.

Multi-layered inductor array

Complex electronic component having a plurality of devices formed side by side in a ceramic material

A method for producing a multi-layered chip inductor includes the steps of: forming coil-shaped internal conductors inside a green ceramic laminate, each of which coil-shaped internal conductors is spiralled around an axial line in the laminating direction of the green ceramic laminate; applying an external electrode paste onto at least one laminating-direction surface of the green ceramic laminate, which external electrode paste connects to an end of the coil-shaped internal conductor; cutting the green ceramic laminate along the laminating direction into chip-shaped green ceramic laminates each having the coil-shaped internal conductor inside; and firing each of the chip-shaped green ceramic laminates and baking the external electrode paste to form an external electrode.

In A method of manufacturing a solid inductor having an inner conductor formed by passing through a magnetic, material. A vitreous diffused material is applied to the surface of the magnetic material, and the diffused material is diffused into the magnetic material by heat treatment, to form a diffusion layer exhibiting low permeability. The thickness of this diffusion layer is adjusted, thereby to make it possible to adjust the inductance value of the solid inductor as well as to improve resistance to humidity of the solid inductor.

Method of manufacturing a solid inductor

In a solid inductor having an inner conductor formed by passing through a magnetic material, a vitreous diffused material is applied to the surface of the magnetic material, and the diffused material is diffused into the magnetic material by heat treatment, to form a diffusion layer exhibiting low permeability. The thickness of this diffusion layer is adjusted, thereby to make it possible to adjust the inductance value of the solid inductor as well as to improve resistance to humidity of the solid inductor.

Solid inductor with vitreous diffused outer layer

A lamination type inductor having a ferrite layer having opposite main surfaces each with a periphery including opposite ends having end edges thereat, the ferrite layer further having end edges at the opposite ends of the main surfaces and a through hole therein along the periphery, the ferrite layer having a conductor pattern on each main surafce thereof, the conductor pattern on one main surface having a first end portion along one end of the one main surface and extending 0.75 turn from about the middle of the first end portion along the periphery of the one main surface of the ferrite layer to the through hole, and the conductor pattern on the other main surface having a second end portion along the other end of the other main surface and extending 0.75 turn from about the middle of the second end portion along the periphery of the other main surface of the ferrite layer to the through hole, the conductor patterns being electrically connected through the through hole for forming a substantially 1.5-turn coil; outside ferrite layers laminated onto the opposite main surfaces of ferrite layer and having outside end portions corresponding to the opposite ends of said ferrite layer; and outside electrodes on the outside of the laminated body at the respective outside end portions of the outside ferrite layers and the end edges of the ferrite layer and electrically connected with the first and second end portions.

Lamination type inductor

A lamination type inductor has a plurality of ferrite sheets assembled one above the other and laminated together, the uppermost and lowermost sheets being end sheets having lead-out conductor patterns thereon and conductor patterns on the surfaces of the end sheets which face each other which are connected to the lead-out conductor patterns and which are for connection to conductor patterns on intermediate sheets, and a plurality of intermediate ferrite sheets, each having a conductor pattern on one surface thereof which corresponds to a 0.25 turn of an inductor coil and a conductor pattern on the other surface which corresponds to a 0.5 turn of an inductor coil, each ferrite sheet having an opening therethrough through which the conductor patterns of the 0.25 and 0.5 turn are electrically connected to form a 0.75 turn of an inductor coil on each ferrite sheet. The conductor patterns on the successive intermediate sheets are connected to each other for forming an inductor coil having a number of turns which is a multiple of 0.75, and the conductor patterns on the upper surface of the uppermost of the plurality of intermediate ferrite sheets and the lower surface of the lowermost of the intermediate ferrite sheets are electrically connected to the conductor patterns on the surfaces of the end sheets which face each other for forming with the lastmentioned conductor pattern a complete inductor coil.

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Shiga-ken, Japan

Hiroyuki Takeuchi