Murata Manufacturing Co., Ltd.

Hideo Ajichi

Takehiro Konoike

Takashi Kodama

Kunisaburo Tomono

Kouji Yamauchi

Akihiro Nakamura

Junji Kurobe

Toshihiko Fukushima

The multilayer inductor includes a multilayer body including a plurality of insulating layers laminated in a lamination direction, and a plurality of coil groups arranged in the multilayer body along the lamination direction and connected in series. Each of the coil groups includes a plurality of coil patterns respectively provided on the insulating layers and laminated in the lamination direction, and is configured by connecting a plurality of pattern groups in series. Each of the pattern groups is formed by connecting n (n is a positive integer) coil patterns in parallel. The number of parallels n of at least one of the coil groups is different from the number of parallels n of another coil group. The insulating layers include magnetic and non-magnetic insulating layers. At least one of the insulating layers adjacent to one of the coil patterns is the non-magnetic insulating layer.

Multilayer inductor

A method of manufacturing a ferrite sintered body includes the steps of: adding B,C in a ferrite raw material and firing the ferrite raw material, whereby the ferrite sintered body has a high &mgr;i and a high Q, is less irregular in its characteristics, has a high volume resistivity and is capable of preventing deterioration of insulating resistance.

Method of manufacturing ferrite sintered body

A method of producing a Ni&mdash;Cu&mdash;Zn ferrite material comprises the steps of preparing a mixture of an iron compound powder having a specific surface area of about 8.5 m,/g or more, a nickel compound powder, copper compound powder and a zinc compound powder, the mixture having a specific surface area of about 8.0 m,/g or more; pre-calcining the mixture such that the pre-calcined mixture has a surface area of about 5.0 m,/g or more and a spinel crystal synthesizability within a range of about 80.5% to 98%; and milling the pre-calcined mixture to obtain a powder of a Ni&mdash;Cu&mdash;Zn ferrite material having a specific surface area of about 6.0 m,/g or more.

Method of producing Ni-Cu-Zn ferrite material

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Omihachiman, Japan

Hideo Ajichi