Murata Manufacturing Co., Ltd.

Hiroki Hashimoto

Tatsuya Mizuno

Mitsuru Ueda

Masaharu Konoue

Yukio Maeda

Masayuki Oishi

Yasuhiro Itani

Kaoru Tachibana

Takuma Shiro

A multilayer inductor manufacturing method includes stacking a first coil conductor layer on a first magnetic layer; stacking a first burn-away material on side surfaces of the first coil conductor layer; stacking a second magnetic layer on the first burn-away material and first magnetic layer; stacking a second burn-away material on the second magnetic layer laterally outside an upper surface of the first coil conductor layer; stacking a second coil conductor layer on the upper surface of the first coil conductor layer and second burn-away material; stacking a third burn-away material on side surfaces and an upper surface of the second coil conductor layer; stacking a third magnetic layer on side surfaces of the third burn-away material and the second magnetic layer; stacking a fourth magnetic layer on the third burn-away material and the third magnetic layer; and burning away the first, second, and third burn-away materials via firing.

Multilayer inductor manufacturing method and multilayer inductor

A coil component includes an element and a coil that is provided inside the element and that is spirally wound. The coil includes a plurality of coil conductor layers and an extended conductor layer, which are laminated in a first direction. The extended conductor layer overlaps a side gap portion, which is situated on an outer side of a region of the element that is surrounded by the coil conductor layers, and extends so as to reach an outer surface of the element. The element includes a first stress relaxation layer that contacts the coil conductor layers, and a second stress relaxation layer that, while extending along the extended conductor layer, contacts a coil-conductor-layer side of the extended conductor layer, and is positioned inside the side gap portion without reaching the outer surface of the element.

Coil component

A laminated coil component is configured by laminating a plurality of magnetic layers and a plurality of coil conductors in a lamination direction. In a cross-section taken along a width direction of the coil conductors, each coil conductor has a first surface on one side in the lamination direction, a second surface on another side in the lamination direction, and side surfaces on both sides in the width direction. The second surface makes contact with the magnetic layer. A hollow cavity portion is formed between the magnetic layer, and the first surface and both side surfaces. The hollow cavity portion has a first extended portion, extending outward in a direction intersecting with the lamination direction, on the first surface side, on at least one of both end sides in the width direction.

Laminated coil component and method of manufacturing the same

A highly reliable multilayer coil component is provided without forming voids between magnetic ceramic layers and internal conductor layers. According to the multilayer coil component, an internal stress problem is reduced, the direct current resistance is low, and fracture of internal conductors caused by the surge or the like is not likely to occur. An acidic solution is allowed to permeate a magnetic ceramic element from a side surface thereof through a side gap portion which is a region between side portions of the internal conductors and the side surface of the magnetic ceramic element and to reach interfaces between the internal conductors and a magnetic ceramic located therearound. A pore area ratio of the magnetic ceramic of the side gap portion which is located between the side portions of the internal conductors and the side surface of the magnetic ceramic element is set in the range of 6% to 28%.

Multilayer coil component and method for manufacturing the same

An electronic component having; a multilayer body including insulating layers stacked on one another; a spiral coil including coil conductors provided on the insulating layers and a first via-hole conductor piercing through at least one of the insulating layers to connect the coil conductors to each other; a parallel conductor provided on one of the insulating layers; and a second via-hole conductor piercing through at least one of the insulating layers to connect the parallel conductor in parallel to one of the coil conductors provided on the insulating layer different from the insulating layer on which the parallel conductor is provided. A portion of the coil conductor not connected in parallel to the parallel conductor at least partly has a greater width than a portion of the coil conductor connected in parallel to the parallel conductor other than a contact point with the second via-hole conductor.

Electronic component

An electronic component having a laminate formed by laminating a plurality of insulator layers and a helical coil provided in the laminate, the coil including first and second coil conductors, and via-hole conductors provided so as to pierce through the insulator layers. The first and second coil conductors are opposed to each other via the insulator layers in a direction of lamination. The first coil conductor has a first side opposed to the second coil conductor and having a convex portion in a cross section normal to a direction in which the first coil conductor extends. The second coil conductor has a second side opposed to the first coil conductor and has a concave portion in a cross section normal to a direction in which the second coil conductor extends. The concave portion overlaps the convex portion in the direction of lamination.

Electronic component and method for producing same

A method for manufacturing a ceramic electronic component capable of preventing degradation of the self alignment property and product characteristics due to absorption of flux into pores of a ceramic element assembly during soldering in mounting and a ceramic electronic component. In the method, a ceramic element assembly is subjected to an oil-repellent treatment by using an oil-repellent agent containing a polyfluoropolyether compound as a primary component and hydrofluoroether as a solvent, so as to avoid absorption of the flux by the ceramic element assembly.

Method for manufacturing ceramic electronic component

A multilayer coil component includes internal conductors made of silver (Ag) having metal films provided on surfaces thereof to suppress migration of Ag contained in the internal conductors and/or relieve internal stress between magnetic ceramic layers and internal conductor layers without forming gaps at interfaces between the internal conductors including the metal films and a magnetic ceramic surrounding the internal conductors and the interfaces between the internal conductors and the magnetic ceramic. In a manufacturing method for forming a multilayer coil, an acidic solution containing a metal is allowed to penetrate a magnetic ceramic through side surfaces thereof and side gap sections that are regions between side portions of internal conductors and the side surfaces to reach the interfaces between the internal conductors and a surrounding magnetic ceramic, whereby the metal is deposited on surfaces of the internal conductors.

Ceramic electronic component

A multilayer coil component is provided in which solder fusibility and a self-alignment property are prevented from being degraded due to absorption of a flux in a soldering step. The multilayer coil component has no voids present at interfaces between internal conductorsand a magnetic ceramiclocated therearound. A magnetic ceramic forming a central regionhas a region (side gap portion) which extends from a side surfaceof the magnetic ceramic element to the internal conductors and which has a pore area ratio of 6% to 20%. At least one of a first external layer region, located at an upper side of the central region, and a second external layer region, located at a lower side of the central region (an external layer region at a mounting surface side of a mounting substrate), has a pore area ratio of less than 5%.

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Nagaokakyo, Japan

Hiroki Hashimoto