Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Reexamination Certificate
2002-07-11
2004-04-27
Tokar, Michael (Department: 2819)
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
C333S204000, C333S202000, C333S116000
Reexamination Certificate
active
06727782
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a multilayered LC composite component and a method for manufacturing the same. More particularly, the present invention relates to improvements in the arrangement of terminal electrodes disposed on the outer surface of the main body of a component.
2. Description of the Related Art
FIG. 13
is a perspective view showing a known multilayered LC composite component
1
related to the present invention.
FIG. 14
is a sectional view showing the inner configuration of the multilayered LC composite component
1
shown in FIG.
13
.
The multilayered LC composite component
1
includes a rectangular main body
2
. The main body
2
includes a pair of side surfaces
3
and
4
facing each other, a pair of end surfaces
5
and
6
facing each other, and an upper surface
7
and a lower surface
8
facing each other.
The main body
2
has a multilayer configuration including a plurality of electrical insulating layers and has capacitor elements
10
and an inductor element
11
. In the multilayered LC composite component
1
shown in
FIG. 14
, one inductor element (L)
11
is disposed between two capacitor elements (C)
10
so as to provide a C-L-C arrangement.
Each of the capacitor elements
10
includes capacitor electrodes
12
on the electrical insulating layers
9
. The capacitor electrodes
12
face each other with the electrical insulating layers
9
therebetween so as to define a capacitance.
The inductor element
11
includes a coil conductor
13
on the electrical insulating layers
9
. As shown in
FIG. 14
, the coil conductor
13
includes coil conductive films
14
extending along specific interfaces between the electrical insulating layers
9
and a coil via-hole conductor (not shown) penetrating specific electrical insulating layers
9
, and the overall coil conductor
13
defines a helix.
At the center of each of the side surfaces
3
and
4
of the main body
2
, ground-side terminal electrodes
16
and
17
are provided, respectively. Also, hot-side terminal electrodes
18
and
19
are disposed on the end surfaces
5
and
6
, respectively.
Each of the capacitor electrodes
12
includes ground-side extended portions (not shown) extending to the side surfaces
3
and
4
. The ground-side terminal electrodes
16
and
17
are connected to the ground-side extended portions, and accordingly, the inductor element
11
is connected to the ground-side terminal electrodes
16
and
17
via each of the capacitor elements
10
and
11
.
Each of the capacitor electrodes
12
includes hot-side extended portions
20
and
21
extending to the end surfaces
5
and
6
of the main body
2
. On the other hand, the coil conductor
13
includes coil extended portions
22
and
23
extending to the end surfaces
5
and
6
, respectively.
The hot-side terminal electrodes
18
and
19
are connected to the coil extended portions
22
and
23
, respectively, so as to be connected to each end of the inductor element
11
. Also, hot-side extended portions
20
and
21
are connected to the hot-side terminal electrodes
18
and
19
, respectively.
In this way, the multilayered LC composite component
1
shown in
FIGS. 13 and 14
constitutes a &pgr;-type LC filer.
The terminal electrodes
16
to
19
are usually formed by applying and baking a conductive paste. However, a process of applying a conductive paste must be performed four times in order to form the terminal electrodes
16
to
19
. That is, a first process of applying a conductive paste on one side surface
3
to form the ground-side terminal electrode
16
, a second process of applying a conductive paste on the other side surface
4
to form the ground-side terminal electrode
17
, a third process of applying a conductive paste on one end surface
5
to form the hot-side terminal electrode
18
, and a fourth process of applying a conductive paste on the other end surface
6
to form the hot-side terminal electrode
19
are needed.
In this method, the number of processes of applying a conductive paste increases, and as a result, the cost for manufacturing the multilayered LC composite component
1
increases.
Further, stray capacitance generated between the coil conductor
13
and the terminal electrodes
16
to
19
, stray capacitance generated between the capacitor electrodes
12
and the terminal electrodes
16
to
19
, and stray capacitance generated between the ground-side terminal electrodes
16
and
17
and the hot-side terminal electrodes
18
and
19
become relatively large. Accordingly, the self-resonance frequency becomes relatively low, which deteriorates the high-frequency characteristics.
SUMMARY OF THE INVENTION
In order to overcome the problems described above, preferred embodiments of the present invention provide a multilayered LC composite component and a method for manufacturing the same, having an improved arrangement of terminal electrodes disposed on the outer surface of the main body of a component and in which the number of steps required to form the terminal electrodes is reduced and the stray capacitance problems of the prior art are eliminated.
According to a first preferred embodiment of the present invention, a multilayered LC composite component includes a substantially rectangular main body having a pair of side surfaces facing each other, a pair of end surfaces facing each other, and an upper surface and a lower surface facing each other. The main body has a laminated construction including a plurality of electrical insulating layers and has a capacitor element and an inductor element. The capacitor element includes capacitor electrodes on the electrical insulating layers and the inductor element includes a coil conductor on the electrical insulating layers. Each of the capacitor electrodes includes ground-side extended portions extending to the pair of side surfaces and the coil conductor includes coil extended portions extending to the pair of side surfaces. Each of the side surfaces is provided with a ground-side terminal electrode connected to each of the ground-side extended portions and a plurality of hot-side terminal electrodes connected to the coil extended portions are disposed on both ends of the pair of side surfaces so as to be connected to the end of the inductor element. The pair of end surfaces are provided with end-surface extended portions of the plurality of hot-side terminal electrodes so that at least the approximate center of each of the pair of end surfaces is exposed.
According to a second preferred embodiment of the present invention, a multilayered LC composite component includes a substantially rectangular main body having a pair of side surfaces facing each other, a pair of end surfaces facing each other, and an upper surface and a lower surface facing each other. The main body has a laminated construction including a plurality of electrical insulating layers and has a capacitor element and an inductor element. The capacitor element includes capacitor electrodes on the electrical insulating layers and the inductor element includes a coil conductor on the electrical insulating layers. Each of the capacitor electrodes includes ground-side extended portions extending to the pair of side surfaces and the coil conductor includes coil extended portions extending to the pair of side surfaces. Each of the side surfaces is provided with a ground-side terminal electrode connected to each of the ground-side extended portions and a plurality of hot-side terminal electrodes connected to the coil extended portions are arranged so as to be connected to the end of the inductor element, the plurality of hot-side terminal electrodes being placed on the side surfaces so as to sandwich the ground-side terminal electrodes, and the hot-side terminal electrodes are not disposed on the pair of end surfaces.
Preferably, the coil extended portions include a connecting path for connecting the pair of side surfaces and the connecting path is connected to the remainder of the coil conductor at the middle point
Azuma Takahiro
Sasaki Tomohiro
Yamamoto Shigekatsu
Keating & Bennett LLP
Mai Lam T.
Murata Manufacturing Co. Ltd.
Tokar Michael
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