Murata Manufacturing Co., Ltd.

Hiroki Kowada

Atsushi Yamamoto

Osamu Naito

A laminated coil component that has DC superimposition characteristics improved without causing an increase in direct-current resistance, and reduces stress which can be generated in a magnetic body. A laminated coil component includes a magnetic section of magnetic layers stacked and a conductor section which has a plurality of conductor pattern layers arranged between the magnetic layers, and interconnected in a coiled shape to pass through the magnetic layers, and which is buried in the magnetic section. The conductor section is composed of a conductor containing silver. The magnetic section is of a sintered ferrite material containing FeO, NiO, ZnO, and CuO. The ratio of the Cu content (in terms of CuO) in a near-conductor section region of the magnetic section to the Cu content (in terms of CuO) in a central region of the magnetic section is 0.2 to 0.5.

Laminated coil component and method for manufacturing same

A laminated coil component includes a magnetic body part made of a ferrite material and a coil conductor wound into a coil shape and embedded in the magnetic body part to form a component base. The component base is divided into a first region near the coil conductor and a second region other than the first region. The grain size ratio of the average crystal grain size of the magnetic body part in the first region to the average crystal grain size of the magnetic body part in the second region is 0.9 or less. The molar content of CuO in the ferrite raw material is set to 0.2 to 4 mol %. In a method laminated coil component, the coil is formed from a conductive paste including Ag, and firing the laminated body is performed by setting the oxygen concentration is 0.1 volume % or less as a firing atmosphere.

Growing community of inventors

Nagaokakyo, Japan

Hiroki Kowada