JP3123207B2 - Composite electronic components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite electronic component used as a noise filter suitable for a high-frequency circuit, and more particularly, to a laminate of a magnetic layer having an inductor portion and a dielectric layer having a capacitor portion. -It relates to a composite electronic component using an integrated laminate.

[0002]

2. Description of the Related Art Japanese Patent Publication No. 62-2889 discloses a T-type LC filter having a structure in which a dielectric and a magnetic material are integrally fired, thereby integrating a capacitor and an inductor or a coil. Since it has a structure in which a capacitor and an inductor or a coil are integrated, a T-type LC
It is possible to reduce the size and cost of the filter. However, since a plurality of inductors or coils are formed in the same magnetic body, a part of noise leaks through the magnetic body, and thus there is a problem that crosstalk occurs between adjacent inductors.

On the other hand, Japanese Utility Model Publication No. 1-15160 discloses a laminated composite component formed by laminating a dielectric material constituting a capacitor portion and a magnetic material constituting an inductor portion. FIG. 7 shows a laminated composite part according to this prior art. In the laminated composite component 1, a capacitor section is formed in the dielectric layer 2, and a plurality of inductor sections are formed in the magnetic layer 3. Then, the plurality of inductor portions are formed by cutting notches 4a to 4c between adjacent inductor portions.
Are formed so as to be separated from each other, thereby preventing occurrence of crosstalk between adjacent inductor portions.

[0004]

However, in the laminated composite part disclosed in Japanese Utility Model Publication No. 1-15160,
A plurality of inductors in the inductor section and a plurality of capacitors in the capacitor section are drawn out to the end face of the multilayer body, and are electrically connected to each other on the outer surface of the multilayer body. Therefore, the shape of the electrode pattern in each inductor and capacitor part is complicated, and various connection external electrodes must be routed and formed in a limited range on the outer surface of the laminate for electrical connection. Did not. As a result, there is a problem that the manufacturing process is complicated. Also, in addition to the external electrodes for internal connection on the outer surface, the external electrodes for electrical connection between the inductor section and the capacitor section are exposed. There was also the problem of having to select and connect.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a composite electronic component in which a capacitor and an inductor are integrated, which is compact and can prevent the occurrence of crosstalk between adjacent inductor portions, and can also be manufactured. An object of the present invention is to provide a composite electronic component capable of simplifying a process and simplifying an electrode structure formed on an outer surface.

[0006]

The composite electronic component of the present invention is constituted by using a laminate having a magnetic layer and a dielectric layer laminated on the magnetic layer. A plurality of first external electrodes and second external electrodes are formed on the outer surface of the laminate. Then, at least two inductor portions are formed by at least two conductor lines extending into the dielectric layer, and one ends of the at least two conductor lines are electrically connected to the at least two first external electrodes, respectively. It is connected to the.

On the other hand, in the dielectric layer, at least one capacitor section is constituted by a plurality of internal electrodes arranged so as to overlap at a predetermined distance. One connection end of at least one capacitor portion is connected to a second external electrode formed on the outer surface of the multilayer body, and the other connection end is connected to the other end of at least two conductor lines. They are connected by a hall. In the magnetic layer, notches for separating the adjacent inductor portions may reach not only the magnetic layer but also the second external electrode.
It is sea urchin formation.

[0008]

A magnetic layer having an inductor portion formed therein;
Since it is configured using a laminated body obtained by laminating a dielectric layer in which a capacitor section is configured, a small LC composite electronic component can be obtained. In addition, since the connection between the inductor section and the capacitor section is performed by the through hole, the capacitor section and the inductor section are electrically connected in the laminate. Therefore, the manufacturing process can be simplified and the number of external electrodes formed can be reduced. In addition, a cut is formed in the magnetic layer to separate adjacent inductor portions, and the passage of magnetic flux is prevented at the cut, so that crosstalk between adjacent inductor portions can be reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be clarified by describing embodiments with reference to the drawings. FIG. 2 is a perspective view showing a composite electronic component according to one embodiment of the present invention. The composite electronic component 11 includes a dielectric layer 12 and a magnetic layer 1
3 is formed using a laminated body 14 formed by laminating the layers 3 and 3. In the dielectric layer 12, a capacitor section described later is formed, and in the magnetic layer 13, two inductor sections described later are formed. A cut 15 is formed at the center of the magnetic layer 13 so as to extend in the thickness direction. The cut 15 is provided to prevent crosstalk between the inductor portions formed on both sides of the cut 15.

On the outer surface of the laminate 14, first external electrodes 16, 17 and second external electrodes 18, 19 are formed. The laminate 14 is formed by laminating the green sheets 21 to 29 shown in FIG. 3 and integrally firing them. Among the ceramic green sheets 21 to 29, the ceramic green sheets 21 to 25 are obtained by mixing and molding a magnetic ceramic powder together with an organic binder, and the ceramic green sheets 26 to 29 are made of a dielectric ceramic. Ceramic powder obtained by mixing a ceramic powder with an organic binder.

On the upper surfaces of the ceramic green sheets 22 to 24, substantially arc-shaped strip-shaped conductive portions 32a and 32, respectively.
b, 33a, 33b, 34a, 34b are formed. One ends of the strip-shaped conductive portions 32a, 32b are connected to lead-out conductive portions 35a, 35b formed along the edges 22a, 22b of the ceramic green sheet 22.
The inner ends of the strip-shaped conductive portions 32a and 32b are formed so as to reach the through holes 36a and 36b. On the other hand, one ends of the strip-shaped conductive portions 33a and 33b are formed so as to reach the through holes 37a and 37b. One end of each of the strip-shaped conductive portions 34a and 34b is also
a, 38b. On the other hand, through holes 40a,
40b are formed.

The above-mentioned magnetic layer 13 is composed of a portion where the above-mentioned ceramic green sheets 21 to 26 are laminated and fired. Since the above-mentioned conductive pattern is formed inside, the magnetic layer 13 is fired after firing. As shown in FIG. 1, first and second inductor sections 41 and 42 are configured. That is, the first inductor portion 41 has a conductor line formed of the strip-shaped conductive portions 32a, 33a, and 34a, and the second inductor portion 42 has the strip-shaped conductive portions 32b and 33a.
A second conductor line composed of b and 34b is formed.
The upper end of each conductor line is continuous with the above-described lead conductive portions 35a and 35b.
a, 35b are the first external electrodes 16, 17 shown in FIG.
It is connected to the.

Returning to FIG. 3, on the ceramic green sheet 26 made of a dielectric material, through-hole electrodes 51,
52 are formed. Further, on the ceramic green sheets 27 and 28, internal electrodes 53 and 54 for extracting capacitance are formed, respectively. In the dielectric layer 12 of FIG. 2 which is formed by stacking and firing ceramic green sheets 26 to 29, as shown in FIG.
Is configured. Then, one connection end of the capacitor section 55, that is, the lower internal electrode 54 is electrically connected to the second external electrodes 18 and 19 shown in FIG. Also,
The other connection end of the capacitor portion 55, that is, the upper internal electrode 53 is connected to the other end of the conductive line of the first and second inductor portions 41 and 42 via the through holes 40a and 40b. ing.

Therefore, in the composite electronic component 11 of this embodiment, as shown in the sectional view of FIG. 4, the internal conductive portions are connected to each other, and the T-type LC filter circuit shown in FIG. Have been. In the composite electronic component 11 of the present embodiment, as is apparent from FIGS. 1 and 4, since the cut 15 is formed between the first and second inductor portions 41 and 42, the first and second notches are formed. The crosstalk between the inductor portions 41 and 42 is prevented.

Moreover, the first and second inductor portions 41,
Since the capacitor 42 and the capacitor portion 55 are connected by the through holes as described above, the number of electrodes formed on the outer surface of the multilayer body 14 can be reduced, and thus the external electrode forming process can be simplified. it can. Further, as apparent from FIG. 2, the operation of electrically connecting the obtained composite electronic component 11 to the outside can be easily performed. As shown in FIG. 6, the above-described cut 15 may be filled with a filler 57 made of glass or a synthetic resin, thereby supplementing the strength of the portion where the cut is formed. The cut 15 can be filled with glass by applying a glass paste and performing a heat treatment at a temperature of about 500 ° C. Materials and the like that can be used to construct the composite electronic component of the above embodiment will be described.

The ceramic green sheets 21 to 25
The magnetic ceramics to be formed are not particularly limited.
However, for example, 0.19NiO + 0.30
ZnO + 0.48Fe_TwoO_Three+0.05 CuO
It is. In addition, ceramic green sheets 26 to 29 are formed.
Examples of dielectric ceramics used to form
For example, 0.5Pb (Mg_1/3Nb_2/3) O_Three+ 0.5Pb
(Mg_1/2W_1/2) O _ThreeAnd those consisting of each
When obtaining a ceramic green sheet,
Usually about 10% by weight of organic binder in lamic powder
Add and mix, thereby obtaining a ceramic slurry,
The ceramic slurry is applied by a doctor blade method or the like.
Each green sheet is obtained by molding.
It is. The thickness of the ceramic green sheet used
Is usually about several tens of μm.

The internal conductive portions such as the strip-shaped conductive portions formed on the upper surface of the ceramic green sheet are formed by pattern printing of a paste containing a conductive powder such as Ag as a main component. In the step of obtaining the laminate 14 using the ceramic green sheets 21 to 29 shown in FIG. 3, the ceramic green sheets are usually laminated and 1 t / cm ²
Pressure, and cut to a predetermined size.
It is performed by firing at a temperature of about ° C.

The first and second external electrodes 16 to 19 can be formed by applying and baking a conductive paste, plating or sputtering. As an example, it is formed by printing an Ag-containing paste on the outer surface of the laminate 14 obtained as described above and baking it at 800 ° C. for 20 minutes. The formation of the notches 15, the second outer In the laminate 14 obtained as described above
At the positions where the external electrodes 18 and 19 are formed , the magnetic layer 1
This is performed by cutting from the third side with a dicing saw, thereby reaching the second external electrodes 18 and 19.
The cut 15 is formed as described above. This cut is usually formed to a width of about 0.3 mm.

[0019]

As described above, according to the present invention, a composite body is formed by using a laminate in which a magnetic layer in which a plurality of inductor portions are formed and a dielectric layer in which a capacitor is formed. Since the electronic components are configured, the size of the LC filter can be reduced. Further, since cuts are formed in the magnetic layer to separate adjacent inductor portions, the occurrence of crosstalk between adjacent inductor portions can be effectively suppressed.

Further, since the capacitor portion and the inductor portion are electrically connected to each other in the laminate by through holes, it is necessary to form an electrode for connecting the inductor portion and the capacitor portion on the outer surface of the laminate. Absent. Therefore, the step of forming the external electrodes can be simplified, and the number of external electrodes formed can be reduced. Further, since the number of external electrodes formed on the outer surface is reduced, an electrical connection operation at the time of use can be easily performed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the internal structure of a composite electronic component according to one embodiment of the present invention.

FIG. 2 is a perspective view of a composite electronic component according to one embodiment of the present invention.

FIGS. 3A to 3I are plan views illustrating a ceramic green sheet used in Examples and the shape of an electrode formed thereon.

FIG. 4 is a sectional view of the composite electronic component of the embodiment.

FIG. 5 is a diagram showing a circuit of the composite electronic component according to the embodiment.

FIG. 6 is a perspective view showing a composite electronic component of another embodiment.

FIG. 7 is a perspective view showing an example of a conventional composite electronic component.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 ... Composite electronic component 12 ... Dielectric layer 13 ... Magnetic layer 14 ... Laminated body 41, 42 ... 1st, 2nd inductor part 55 ... Capacitor part

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-155609 (JP, A) JP-A-3-39824 (JP, U) JP-A-61-157309 (JP, U) 15160 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01F 17/00, 27/00, 41/04 H01G 4/40 H03H 7/075

Claims (1)

(57) [Claims] 1. A laminate having a magnetic layer and a dielectric layer laminated on the magnetic layer, at least two first external electrodes formed on an outer surface of the laminate, and at least one And two second external electrodes, wherein at least two inductor portions are constituted by at least two conductor lines extending into the magnetic layer, and one end of the at least two conductor lines is formed by the at least two conductor lines. At least one of a plurality of first external electrodes connected to the first external electrodes, and each of the plurality of first external electrodes is arranged in the dielectric layer so as to overlap at a predetermined distance.
And one connection end of the at least one capacitor portion is electrically connected to a second external electrode formed on the outer surface of the laminate, and the other connection end is At least two conductor lines are connected to the other ends of the conductor lines by through holes. The magnetic layer has cuts for separating adjacent inductor portions , not only in the magnetic layer, but also in the second outer layer.
Characterized by being formed so as to reach the unit electrode ,
Composite electronic components.