US 4,746,557 AGranted

LC composite component

AssigneeMurata Manufacturing Co., Ltd.

InventorsYukio Sakamoto, Takeshi Tanabe, Yasuo Fujiki, Hiromichi Sakai, Kunisaburo Tomono, Michihiro Murata, Harufumi Mandai, Yasuyuki Naito, Hidemichi Mori

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Abstract

An LC composite component employing a ceramic sintered body obtained by laminating pluralities of magnetic green sheets and dielectric green sheets and cofiring the same. The ceramic sintered body is provided therein with a magnetic region and a dielectric region along the direction of thickness. The magnetic region of the sintered body is provided with at least one inner electrode layer which extends to first opposite side surfaces of the sintered body, thereby to define an inductance unit. The dielectric region is provided with a plurality of electrodes oppositely arranged through the dielectric substance, which plurality of electrodes includes first and second electrodes. A pair of first outer electrodes are formed on the first side surfaces of the sintered body, to be electrically connected with the inner electrode formed in the magnetic region. The first electrode in the dielectric region is electrically connected with at least one of the first outer electrodes, and the second electrodes is connected with a second outer electrode which is formed on another surface of the sintered body.

Claims14

Dependent claims

An LC composite component comprising:

a laminated and cofired ceramic sintered body having a top surface and a bottom surface which define therebetween a thickness direction, comprising at least one magnetic green sheet laminated and cofired with at least one dielectric green sheet, said ceramic sintered body being thereby provided with at least one magnetic region and at least one dielectric region along the direction of thickness;
wherein said magnetic region comprises Ni-Zn system ferrite and said dielectric region comprises composite perovskite material containing lead;
at least one inductive inner electrode being provided in said magnetic region of said sintered body and extending between a pair of first side surfaces opposite each other on said sintered body to define an inductance unit in said magnetic region;
first and second capacitive electrodes being located opposite to each other in said dielectric region to enclose a portion of said dielectric region along the direction of thickness to define a capacitor unit in said dielectric region;
a pair of first outer electrodes electrically connected with said inductive inner electrode and formed on said pair of first side surfaces of said sintered body;
and
a second outer electrode provided on a surface of said sintered body other than said first side surfaces,
said first capacitive electrode being electrically connected with at least one of said pair of first outer electrodes, and
said second capacitive electrode being electrically connected with said second outer electrode.

6 more elements

A filter block comprising a plurality of LC composite components provided side by side in a single sintered body, each said component comprising:

a laminated and cofired ceramic sintered body having a top surface and a bottom surface which define therebetween a thickness direction, comprising at least one magnetic green sheet laminated and cofired with at least one dielectric green sheet, said ceramic sintered body being thereby provided with at least one magnetic region and at least one dielectric region along the direction of thickness;
wherein said magnetic region comprises Ni-Zn system ferrite and said dielectric region comprises composite perovskite material containing lead;
at least one inductive inner electrode being provided in said magnetic region of said sintered body and extending between a pair of first side surfaces opposite each other on said sintered body to define an inductance unit in said magnetic region;
first and second capacitive electrodes being located opposite to each other in said dielectric region to enclose a portion of said dielectric region along the direction of thickness to define a capacitor unit in said dielectric region;
a pair of first outer electrodes electrically connected with said inductive inner electrode and formed on said pair of first side surfaces of said sintered body;
and
a second outer electrode provided on a surface of said sintered body other than said first side surfaces,
said first capacitive electrode being electrically connected with at least one of said pair of first outer electrodes, and
said second capacitive electrode being electrically connected with said second outer electrode;
wherein said dielectric region is formed to be exposed on at least one of said top and bottom surfaces of said sintered body, and said second outer electrode is formed on at least the same one of said top and bottom surfaces of said sintered body, so that said second outer electrode also serves as said second capacitive electrode;
said second outer electrodes of said plurality of components being formed on the same one of the top and bottom surfaces of said sintered body in all the respective said LC composite components.

8 more elements

Dependencies are inferred from the claim text.