Open magnetic circuit multilayer coil component and process for producing the open magnetic circuit multilayer coil component
AssigneeMurata Manufacturing Co., Ltd.
InventorsAkihiro Nakamura, Akiko Sato, Yoichi Nakatsuji
Life of this patent
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Abstract
An open magnetic circuit multilayer coil component includes a laminate with magnetic layers, a coil, and a nonmagnetic layer provided within the laminate so as to cross a magnetic path formed by energization of the coil. A nonmagnetic material constituting the nonmagnetic layer is a Zn—Cu-based ferrite nonmagnetic material, and a magnetic material constituting the magnetic layer is a magnetic material containing 100 parts by weight of an Ni—Zn—Cu-based magnetic ferrite material and 0.1 to 2.0 parts by weight, in terms of Co3O4, of Co added to the Ni—Zn—Cu-based magnetic ferrite material.
Claims18
An open magnetic circuit multilayer coil component comprising:
- a laminate including a coil incorporated laminate section and an exterior section, said coil incorporated laminate section including a plurality of conductors for a coil stacked with a plurality of magnetic layers containing an Ni—Zn—Cu-based ferrite material as their main constituent, said plurality of conductors for a coil electrically connected to form a coil in the coil incorporated laminate section, and said exterior section having magnetic layers stacked on external sides of the coil incorporated laminate section in a stacking direction of the coil incorporated laminate section;
- and
- a nonmagnetic layer containing a Zn—Cu-based ferrite material, the nonmagnetic layer provided within the laminate so as to cross a magnetic path formed within the laminate by energization of the coil,
- wherein a magnetic material constituting the magnetic layers contains 100 parts by weight of the Ni—Zn—Cu-based ferrite material and 0.1 to 2.0 parts by weight of Co in terms of Co3O4 with respect to the Ni—Zn—Cu-based ferrite material.
A process for producing an open magnetic circuit multilayer coil component comprising a laminate including a coil incorporated laminate section and an exterior section, said coil incorporated laminate section including a plurality of conductors for a coil stacked with a plurality of magnetic layers, said plurality of conductors for a coil electrically connected to form a coil in the coil incorporated laminate section, said exterior section having magnetic layers stacked on external sides of the coil incorporated laminate section in a stacking direction of the coil incorporated laminate section, and a nonmagnetic layer containing a Zn—Cu-based ferrite material provided within the laminate so as to cross a magnetic path formed within the laminate by energization of the coil, the process comprising the steps of:
- (a) preparing a magnetic ceramic green sheet containing a magnetic material as its main constituent, the magnetic material containing an Ni—Zn—Cu-based ferrite material and 0.1 to 2.0 parts by weight of Co in terms of Co3O4 with respect to 100 parts by weight of the Ni—Zn—Cu-based ferrite material, a coil forming magnetic ceramic green sheet with a conductor pattern for a coil formed on the magnetic ceramic green sheet, and a nonmagnetic ceramic green sheet containing a nonmagnetic material as its main constituent;
- (b) forming an unfired laminate by stacking the magnetic ceramic green sheet, the coil forming magnetic ceramic green sheet, and the nonmagnetic ceramic green sheet, the unfired laminate comprising an unfired coil incorporated laminate section in which a plurality of conductor patterns for a coil and a plurality of magnetic ceramic green sheets are stacked, the coil incorporated laminate section having therein a coil pattern formed by connecting the plurality of conductor patterns for a coil;
- an unfired exterior section made of magnetic ceramic green sheets provided on external sides in the stacking direction of the unfired coil incorporated laminate section;
- and a nonmagnetic ceramic green sheet provided so as to be sandwiched between the coil forming magnetic ceramic green sheets constituting the unfired coil incorporated laminate section;
- (c) forming a pair of external electrode patterns on the unfired laminate, said pair of external electrode patterns connected at each end of the coil pattern;
- and
- (d) firing the unfired laminate with the external electrode patterns formed.
Dependencies are inferred from the claim text.