US 6,556,420 B1Granted

Wiring connection structure of laminated capacitor and decoupling capacitor, and wiring board

AssigneeMurata Manufacturing Co., Ltd.

InventorsYasuyuki Naito, Masaaki Taniguchi, Yoichi Kuroda, Haruo Hori, Takanori Kondo

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Abstract

An apparatus is provided for packaging a laminated capacitor made to have a low ESL value and is used for a decoupling capacitor to be connected to a power supply circuit for a MPU chip providing a MPU. The laminated capacitor is accommodated within a cavity provided on a wiring board. The capacitor includes a plurality of first external terminal electrodes connected to first internal electrodes via a plurality of first feedthrough conductors and a plurality of second external terminal electrodes connected to second internal electrodes via a plurality of second feedthrough conductors. The first external terminal electrodes provided on a first major surface of a capacitor body are connected to via-hole conductors at the hot side for the power source within a substrate, and the second external terminal electrodes provided on first and second major surfaces are connected to grounding via-hole conductors and a mother board within the substrate.

Claims67

Dependent claims

A laminated capacitor comprising:

a capacitor body having first and second major surfaces and including a laminated stack of a plurality of dielectric layers, at least a pair of a first and second internal electrodes opposed to each other with at least one of the dielectric layers being disposed therebetween;
a plurality of first feedthrough conductors perforating through at least one of the dielectric layers provided within the capacitor body, the first feedthrough conductors being electrically insulated from the second internal electrodes and electrically connected to the first internal electrodes;
and
a plurality of second feedthrough conductors perforating through the capacitor body and provided within the capacitor body, the second feedthrough conductors are electrically insulated from the first internal electrodes and are electrically connected to the second internal electrodes, the first and second feedthrough conductors are arranged to offset the magnetic fields induced by the electric current flowing through the internal electrodes;
a plurality of first external terminal electrodes arranged so as to correspond to the respective first feedthrough conductors and electrically connected to respective ones of the first feedthrough conductors;
and
a plurality of second external terminal electrodes, which are arranged to correspond to respective ones of the second feedthrough conductors and electrically connected to respective ones of the second feedthrough conductors;
wherein
the first external terminal electrodes are located at least on the first major surface of the capacitor body and extend substantially parallel to the internal electrodes, and the second external terminal electrodes are located on both the first major surface and the second major surface in opposed relation to the first major surface.

6 more elements

A capacitor comprising:

a capacitor body made of a dielectric material and having two major surfaces opposed to each other and a plurality of side surfaces disposed between the two major surfaces;
a plurality of first internal electrodes having a first polarity and a plurality of second internal electrodes having a second polarity, the plurality of first and second internal electrodes being disposed in the dielectric material of the capacitor body and being arranged such that the plurality of first internal electrodes are disposed substantially parallel to the two major surfaces of the capacitor body and the plurality of second internal electrodes are disposed substantially perpendicular to the two major surfaces of the capacitor body;
and
at least one external electrode disposed on one of the two major surfaces of the capacitor body;
wherein
at least one of the plurality of second internal electrodes extends from a first one of the two major surfaces of the capacitor body to a second one of the two major surfaces of the capacitor body, and at least one of the plurality of second internal electrodes extends from the first one of the two major surfaces of the capacitor body to a location that is spaced from the second one of the two major surfaces of the capacitor body.

3 more elements

A capacitor comprising:

a capacitor body made of a dielectric material and having two major surfaces opposed to each other and a plurality of side surfaces disposed between the two major surfaces;
a plurality of first internal electrodes having a first polarity and a plurality of second internal electrodes having a second polarity, the plurality of first and second internal electrodes being disposed in the dielectric material of the capacitor body and being arranged such that the plurality of first internal electrodes are disposed substantially parallel to the two major surfaces of the capacitor body and the plurality of second internal electrodes are disposed substantially perpendicular to the two major surfaces of the capacitor body;
and
at least one external electrode disposed on one of the two major surfaces of the capacitor body;
wherein
the capacitor body includes a first section in which at least one of said plurality of second internal electrodes is located and a second section in which another of said plurality of second internal electrodes is not located.

3 more elements

A capacitor comprising:

a capacitor body made of a dielectric material and having two major surfaces opposed to each other and a plurality of side surfaces disposed between the two major surfaces;
a plurality of first internal electrodes having a first polarity and a plurality of second internal electrodes having a second polarity, the plurality of first and second internal electrodes being disposed in the dielectric material of the capacitor body and being arranged such that the plurality of first internal electrodes are disposed substantially parallel to the two major surfaces of the capacitor body and the plurality of second internal electrodes are disposed substantially perpendicular to the two major surfaces of the capacitor body;
and
at least one external electrode disposed on one of the two major surfaces of the capacitor body;
wherein
at least one of the plurality of second internal electrodes is arranged to extend from one of the two major surfaces of the capacitor body toward the other of the two major surfaces of the capacitor body such that the at least one of the plurality of second internal electrodes is connected to respective ones of the plurality of first internal electrodes in a first section of the capacitor body but not in a second section of the capacitor body, and such that another of the plurality of second internal electrodes extends in each of the first and second sections of the capacitor body and is connected to respective ones of the plurality of first internal electrodes in each of the first and second sections of the capacitor body.

3 more elements

Dependencies are inferred from the claim text.