Tdk Corporation

Yuusuke Nagai

Kunihiko Kawasaki

Takashi Suzuki

Shinichi Kondo

Masaki Takahashi

Shinichi Sato

Takashi Endo

Yuya Ishima

Kouichi Kakuda

Yoshimitsu Satoh

Hidekazu Sato

Masazumi Arata

Kenji Komorita

In a multilayer coil component, an end of a lower coil layer and an end of a connecting part are directly overlapped, and the end of the lower coil layer includes a contact edge positioned on a side of the connecting part and being in contact with the connecting part and a non-contact edge positioned on a side opposite to the connecting part and not being in contact with the connecting part. Then, the contact edge and the non-contact edge are not overlapped when viewed from a laminated direction. Consequently, a propagation distance of a crack becomes longer as compared with the case where an end face is parallel to the laminated direction, effectively suppressing advance of the crack. Suppressed advance of a crack in this manner makes the multilayer coil component provide a high component strength as a whole.

Multilayer coil component

A soft magnetic metal powder includes a plurality of soft magnetic metal grains composed of an Fe&#x2014;Si based alloy. A content of P in the Fe&#x2014;Si based alloy is 110 to 650 ppm provided that a total content of Fe and Si is 100 mass %. A soft magnetic metal fired body includes soft magnetic metal fired grains composed of an Fe&#x2014;Si based alloy. A content of P in the Fe&#x2014;Si based alloy is 110 to 650 ppm provided that a total content of Fe and Si is 100 mass %.

Soft magnetic metal powder, soft magnetic metal fired body, and coil type electronic device

A multilayer coil component includes an element body including soft magnetic metal powders and a coil disposed in the element body. The coil includes a plurality of internal conductors electrically connected to each other. The plurality of internal conductors are separated from each other in a first direction and are adjacent to each other in the first direction. An average particle diameter of the soft magnetic metal powders located at an inner side of the coil when viewing from the first direction is larger than an average particle diameter of the soft magnetic metal powders located between the internal conductors adjacent to each other in the first direction.

In a multilayer coil component, even when both pairs of ends of a first coil part and a second coil part are located at the same positions when viewed from the laminated direction and have the same shapes, a connecting part is connected only to a second end of the first coil part on the upper side in the laminated direction, and is connected only to a first end of the second coil part on the lower side in the laminated direction. Thus, a coil wound around along the laminated direction is structured without misaligning the positions of respective connecting parts. Consequently, the entire shapes of the respective coil parts can be designed to be the exact same shape, which makes it possible to reduce the number of types of coil part, saving labor and time for preparing many types of conductor patterns like the conventional type.

Each of internal conductors includes an annular portion with two end portions and an extension portion extending along the one end portion from the other end portion and separated from the one end portion. An edge of the one end portion and an edge of the other end portion oppose each other. The internal conductors include two first internal conductors and a second internal conductor located between the first internal conductors in a first direction. The one end portion of at least one first internal conductor includes a first portion overlapping the edges of the two end portions of the second internal conductor and a second portion overlapping a region between the edges of the two end portions of the second internal conductor, when viewed from the first direction. The second portion is recessed at a side opposite to the region, as compared with the first portion.

A coil includes a plurality of internal conductors that are electrically connected to each other and are disposed in an element body having magnetism. The plurality of internal conductors includes conductor portions that are separated from each other in a first direction and overlap each other when viewed from the first direction. At least one low-permeability layer is disposed along the conductor portions between the internal conductors adjacent to each other in the first direction. Permeability of the low-permeability layer is lower than permeability of the element body. The low-permeability layer includes a first portion contacting the internal conductors and at least one second portion separated from the internal conductors in the first direction, between the internal conductors adjacent to each other. The element body includes first element body regions that are interposed between the second portion and the internal conductors.

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Tokyo, Japan

Yuusuke Nagai