JPH11283833A - Laminated electronic component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain laminated electronic components superior in electrical characteristics in a high frequency band by reducing the generation of a floating capacity. SOLUTION: Plural insulated sheets, respectively provided with a coil conductor on their surfaces are piled and then integrally baked to make a laminated body 40. The respective coil conductors are electrically connected in serial through a via hole respectively provided for the insulated sheet to make a coil in the state of a solenoid L11 with a parallel axis, with respect to the piling direction. On a top surface 40a of the body 40, an inputting external electrode 31a and an outputting external electrode 31b are arranged facing opposite to each other, in a direction parallel to the piling direction of the insulated sheets.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a multilayer electronic component,
In particular, it relates to a laminated electronic component having a built-in coil.

[0002]

2. Description of the Related Art As a laminated electronic component incorporating a coil, for example, an inductor as shown in FIG. 11 has been proposed. The inductor 1 includes an insulating sheet 2 provided with coil conductors 3a to 3d on the surface thereof, a protective insulating sheet 2 provided with no conductor on the surface in advance, and the like. The coil conductors 3 a to 3 d are electrically connected in series via via holes 6 a to 6 c provided in the insulating sheet 2, respectively, and have a solenoidal coil L 1 having an axis parallel to the direction in which the insulating sheets 2 are stacked. Is done.

[0003] Each of the insulating sheets 2 is stacked and then integrally fired to form a laminate 8 as shown in FIG. An input external electrode 9 and an output external electrode 10 are provided at the left and right ends of the laminate 8 respectively. One lead portion (specifically, the end portion of the coil conductor 3a) 4a of the coil L1
Is electrically connected to the input external electrode 9, and the other lead portion (specifically, the end of the coil conductor 3 d) 4 b is electrically connected to the output external electrode 10.

[0004]

By the way, in the multilayer inductor 1 thus obtained, since the external electrodes 9 and 10 are opposed to each other with the multilayer body 8 interposed therebetween as shown in FIG.
A relatively large stray capacitance Cs is generated between the external electrodes 9 and 10. As a result, the conventional laminated inductor 1 has a problem that impedance characteristics and Q characteristics in a high frequency band deteriorate due to the stray capacitance Cs. In particular, the solenoid-shaped coil has a problem that, due to its shape, the opposing region between the external electrodes 9 and 10 formed with the laminated body 8 interposed therebetween increases, so that the generation of stray capacitance becomes more remarkable. there were. Also, these problems are related to inductor 1
When the distance between the external electrodes 9 and 10 is reduced in accordance with the miniaturization of the device, the stray capacitance increases and becomes remarkable.

Further, since the external electrodes 9 and 10 formed on the left and right end surfaces of the laminate 8 are perpendicular to the axial direction of the coil L1, the magnetic field generated by the current flowing through the coil L1 is generated. Are linked almost perpendicularly to the external electrodes 9 and 10. For this reason, an eddy current is generated in the external electrodes 9 and 10, and there is a problem that the inductance of the inductor 1 is reduced in a high frequency band due to the eddy current loss.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a multilayer electronic component which generates little stray capacitance and has excellent electrical characteristics in a high frequency band.

[0007]

In order to achieve the above object, a laminated electronic component according to the present invention comprises: (a) a laminated body formed by laminating a plurality of insulating material layers and a plurality of coil conductors; (B) a coil configured by electrically connecting the coil conductors and having an axis parallel to the stacking direction of the stack, and (c) the stack parallel to the axial direction of the coil. An input external electrode and an output external electrode are provided on one side surface of the body, and are electrically connected to a lead portion of the coil.

According to the above configuration, the input external electrode and the output external electrode are provided on one side surface of the laminate, so that the input external electrode and the output external electrode do not face each other with the laminate interposed therebetween. And the stray capacitance generated between them. In particular, the shape of a solenoidal coil is
When external electrodes are formed with the laminate interposed therebetween, the number of opposing regions between the external electrodes increases. However, the juxtaposition of the external electrodes significantly reduces the stray capacitance. In addition, since the input and output external electrodes are parallel to the axial direction of the coil, most of the magnetic field generated by the current flowing through the coil does not interlink with the input and output external electrodes, resulting in eddy current loss. Is reduced.

Further, an array-type electronic component can be obtained by arranging a plurality of coils in a state of being electrically independent from each other. By arranging the input external electrodes and the output external electrodes connected to each coil in a staggered manner, the distance between the external electrodes adjacent to each other is increased, and crosstalk between adjacent coils is less likely to occur. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the multilayer electronic component according to the present invention will be described with reference to the accompanying drawings.

[First Embodiment, FIGS. 1 to 4] As shown in FIG. 1, a multilayer inductor array 21 includes a coil L11
Conductors 23a to 23c and coil L13 constituting
An insulating sheet 22 provided on the surface with coil conductors 25a to 25c constituting the coil, and an insulating sheet provided on the surface with coil conductors 24a to 24c constituting the coil L12 and coil conductors 26a to 26c constituting the coil L14 22 and a protective insulating sheet 22 having no conductor on the surface in advance.

The coil conductors 23a to 23c are electrically connected in series via via holes 35a to 35d provided in the insulating sheet 22, respectively, and have a solenoid shape having an axis parallel to the stacking direction of the insulating sheets 22. This is called coil L11. The coil conductors 24a to 24c are formed in via holes 36a to 36d provided in the insulating sheet 22, respectively.
Are electrically connected in series through a coil, and a solenoid-shaped coil L12 having an axis parallel to the stacking direction of the insulating sheets 22 is formed. The coil conductors 25a to 25c are respectively provided in via holes 37a to 37c provided in the insulating sheet 22.
7d are electrically connected in series through the insulating sheet 2
The solenoid-shaped coil L13 has an axis parallel to the stacking direction of the two. Coil conductors 26a to 26c
Are via holes 38 provided in the insulating sheet 22 respectively.
The solenoidal coil L14 is electrically connected in series via a to 38d and has an axis parallel to the stacking direction of the insulating sheets 22.

The coil conductors 23a to 23c and the coil conductor 24a constituting the adjacent coils L11 and L12, respectively.
24c are formed on another sheet 22. Thereby, the coil conductors 23a to 23c and the coil conductors 24a to 24a
24c, and the distance between adjacent coils L1
The structure is such that crosstalk between the L1 and L12 hardly occurs. For the same reason, the coil conductors 24a to 24c and the coil conductors 25a to 25c constituting the adjacent coils L12 and L13 are formed on another sheet 22, and the coil conductors 25a to 25c constituting the adjacent coils L13 and L14, respectively. And coil conductors 26a to 26c
Are also formed on another sheet 22.

The insulating sheet 22 is a sheet formed from a slurry material prepared by kneading a magnetic material (for example, ferrite) or a nonmagnetic material with a binder and the like. The coil conductors 23a to 26c are made of Ag, Pd, C
u, Au, Ag-Pd or the like, and is formed by a method such as printing.

After the sheets 22 are stacked, they are integrally fired to form a laminate 40 as shown in FIG.
On the upper surface 40a of the laminate 40, four coils L
Input external electrodes 31a to 34a and output external electrodes 31b to 34b of 11 to L14 are provided in a staggered manner. Thereby, the input external electrodes 31a to 34a adjacent to each other
Between each other and adjacent output external electrodes 31b to 34b
The distance between the adjacent coils L11 to L1 is increased.
4 can suppress crosstalk from occurring.
Input external electrodes 31a to 34a and output external electrodes 31b to 3
4b are opposed to each other in a direction parallel to the stacking direction of the sheets 22.

These short external electrodes 31a to 34b
Has a short side installed in a direction parallel to the axial direction of the coils L11 to L14. This is because the facing area between the coils L11 to L14 and the external electrodes 31a to 34b is reduced, and the stray capacitance generated between the coils L11 to L14 and the external electrodes 31a to 34b is reduced as much as possible. Laminate 4
0 is used as a mounting surface when the inductor array 21 is soldered to a printed circuit board or the like. The stacking direction of the sheets 22 is parallel to the mounting surface 40a, and the axial directions of the coils L11 to L14 are also parallel.

The one lead portion (specifically, the end of the coil conductor 23a) 27a of the coil L11 is connected to the input external electrode 31.
a, and the other lead portion (specifically, the end of the coil conductor 23c) 27b is electrically connected to the output external electrode 31b. One of the lead portions (specifically, the end of the coil conductor 24a) 28a of the coil L12 is electrically connected to the input external electrode 32a, and the other lead portion (specifically, the end of the coil conductor 24c) 28b is It is electrically connected to the output external electrode 32b. Coil L13
Is connected to the input external electrode 33a, and one of the lead portions (specifically, the end of the coil conductor 25a)
The other drawer (specifically, the end of the coil conductor 25c)
Reference numeral 29b is electrically connected to the output external electrode 33b. One of the lead portions (specifically, the end of the coil conductor 26a) 30a of the coil L14 is electrically connected to the input external electrode 34a, and the other lead portion (specifically, the end of the coil conductor 26c) 30b is It is electrically connected to the output external electrode 34b.

FIG. 3 is a cross-sectional view schematically showing the configuration of the inductor array 21. As shown in FIG. The lead portions 27a to 30b of the coils L11 to L14 are connected to the external electrodes 31a to 3b, respectively.
4b is connected to a position closer to the inside of the coil conductor 23b.
The device is designed so that stray capacitance between the electrodes a to 26c and the external electrodes 31a to 34b is hardly generated.

The inductor array 21 having the above configuration
Are input external electrodes 31a to 34a and output external electrodes 31
Since b to 34b are provided only on the mounting surface 40a,
Input external electrodes 31a to 34a and output external electrodes 31b to 3
4b do not face each other across the laminate 40, and the input external electrodes 31
The stray capacitance generated between the output external electrodes 31b to 34b and the output external electrodes 31b to 34b can be reduced as compared with the related art. Further, the input external electrodes 31a to 34a and the output external electrodes 31
Since b to 34b are parallel to the axial direction of the coils L11 to L14, most of the magnetic field generated by the current flowing through the coils L11 to L14 interlinks with these external electrodes 31a to 34b. In addition, the eddy current loss can be reduced as compared with the related art. As a result, it is possible to obtain the multilayer inductor array 21 in which the generation of stray capacitance is small and the electrical characteristics in the high frequency band are excellent.

FIG. 4 is a graph showing the impedance characteristics of the multilayer inductor array 21 (see the solid line 41). For comparison, the impedance characteristics of a conventional multilayer inductor array in which an input external electrode and an output external electrode face each other across a multilayer body are also shown (dotted line 42).
reference). From FIG. 4, it is recognized that the inductor array 21 has excellent impedance characteristics in a high frequency band.

[Second Embodiment, FIGS. 5 to 7] In the second embodiment, as shown in FIGS. 5 to 7, the laminated inductor array 21 described with reference to FIGS. , Capacitor electrodes 53a, 53 constituting capacitor C1
b, capacitor electrodes 54a constituting the capacitor C2,
54b, a capacitor electrode 55 constituting the capacitor C3
The insulating sheet 22 provided with a, 55b and capacitor electrodes 56a, 56b constituting the capacitor C4 on the respective surfaces is further inserted and arranged to form a laminated LC composite component 51.

The coil conductors 23a to 23c form two series-connected solenoid-shaped coils L11a and L11b, and a capacitor C1 is connected at an intermediate position between the coils. The coil conductors 24a to 24c form two series-connected solenoid coils L12a and L12b,
The capacitor C2 is connected to the connection intermediate position.
The coil conductors 25a to 25c form two series-connected solenoidal coils L13a and L13b, and a capacitor C3 is connected to a connection intermediate position between the coils. The coil conductors 26a to 26c form two series-connected solenoidal coils L14a and L14b, and a capacitor C4 is connected to a connection intermediate position between the coils.

The capacitor electrode 53a of the capacitor C1
Is electrically connected to one ends of the coils L11a and L11b via a via hole 57 provided in the insulating sheet 22 and the like. The capacitor electrode 54a of the capacitor C2 is electrically connected to one ends of the coils L12a and L12b via a via hole 58 provided in the insulating sheet 22 or the like. The capacitor electrode 55a of the capacitor C3 is connected to the coil L via a via hole 59 or the like provided in the insulating sheet 22.
13a and L13b are electrically connected to one end. The capacitor electrode 56a of the capacitor C4 is connected to the coil L14a via a via hole 60 or the like provided in the insulating sheet 22.
And L14b are electrically connected to one end. On the other hand, the capacitor electrodes 53 of the capacitors C1, C2, C3, C4
b, 54b, 55b and 56b are via holes 57 and 5
8, 59, 60 and has a predetermined gap,
The coils L11a to L14b are not conducting. These capacitor electrodes 53b, 54b, 55b, 56b are electrically connected to each other and serve as a common ground electrode.

The capacitor electrode 53a and the capacitor electrode 54a respectively constituting the adjacent capacitors C1 and C2
Are formed on another sheet 22 with the capacitor electrodes 53b and 54b, which are common electrodes, interposed therebetween. Therefore, the capacitor electrode 53a and the capacitor electrode 54a are electromagnetically shielded by the capacitor electrodes 53b and 54b,
The structure is such that crosstalk between the adjacent capacitors C1 and C2 hardly occurs. For the same reason, the capacitor electrodes 54a and 55a constituting the adjacent capacitors C2 and C3 are formed on another sheet 22 with the capacitor electrodes 54b and 55b interposed therebetween, and constitute the adjacent capacitors C3 and C4, respectively. The capacitor electrode 55a and the capacitor electrode 56a to be formed are also formed on separate sheets with the capacitor electrodes 55b and 56b interposed therebetween. In FIGS. 5 to 7, parts corresponding to FIGS. 1 to 3 are denoted by corresponding reference numerals, and redundant description will be omitted.

After the sheets 22 are stacked, they are integrally fired to form a laminate 70 as shown in FIG. Input external electrodes 61a to 64a and output external electrodes 61b to 64b are provided in a zigzag manner on the left and right sides of the mounting surface 70a of the laminate 70, respectively. Input external electrodes 61a to 64a
Are the left end surfaces of the laminate 70 (the coils L11a to L14b
The output external electrodes 61a to 64b extend to the right end face 70c of the multilayer body 70.

Here, as shown in FIG. 7, the end faces 70b,
The extension distance D of the external electrodes 61a to 64b at 70c is set to a size such that the external electrodes 61a to 64b do not overlap the region S surrounded by the extension of the coils L11a to L14b.
Coils L11a to L14b are provided on the external electrodes 61a to 64b.
This is to prevent eddy current loss due to the generated magnetic field from occurring. The external electrodes 61a-64b are connected to the end faces 70b, 70
When the composite component 51 is mounted on a printed circuit board or the like, a solder fillet for confirming the solderability between the external electrodes 61a to 64b and the pattern of the printed circuit board can be formed on the end faces 70b and 70c by extending the composite component 51 on the printed circuit board. it can.

Further, a ground external electrode 65 is provided at the center of the mounting surface 70a of the laminate 70. The ground external electrode 65 is connected to the capacitor electrodes 53b, 54
b, 55b, and 56b are electrically connected to the respective drawers.

In the composite component 51 having the above structure, the external electrodes 61a to 64b are connected to the ground-side capacitor electrode 53.
b, 54b, 55b, and 56b, so that the external electrodes 61a to 64b and the capacitor electrodes 53b to
The stray capacitance generated between the capacitor and the gate 56b can be reduced as compared with the related art.

[Third Embodiment, FIGS. 8 to 10] As shown in FIGS. 8 to 10, the multilayer inductor 71 is similar to FIGS.
In the conventional multilayer inductor 1 described with reference to FIG.
Instead of the input external electrodes 9 and the output external electrodes 10 provided on the left and right end surfaces of the multilayer body 8, input external electrodes 72 and output external electrodes 73 are provided on the left and right sides of the mounting surface 8a of the multilayer body 8, respectively. In addition, in FIGS.
The parts corresponding to those in FIG.
Duplicate description is omitted. The inductor 71 having the above configuration can also achieve the same operation and effect as the inductor array 21 of the first embodiment.

[Other Embodiments] The present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist. In the case of manufacturing a laminated electronic component, the method is not necessarily limited to a method of stacking insulating sheets provided with coil conductors on the surface and then firing them integrally. As the insulating sheet, a pre-fired one may be used. Further, a multilayer electronic component may be manufactured by a method described below. That is, after forming an insulating layer with a paste-like insulating material by means such as printing, a coil-like conductor is formed by applying a paste-like conductive material to the surface of the insulating layer. Next, a paste-like insulating material is applied from above the coil conductor to form an insulating layer in which the coil conductor is embedded. Similarly, by performing electrical connection of necessary portions of the coil conductor while sequentially applying layers, an electronic component having a laminated structure can be obtained.

[0031]

As is apparent from the above description, according to the present invention, the input and output external electrodes are provided on one side of the laminate parallel to the axial direction of the coil. The output external electrodes do not face each other with the laminate interposed therebetween, so that stray capacitance generated between the input external electrodes and the output external electrodes can be suppressed. In addition, since the input and output external electrodes are parallel to the axial direction of the coil, most of the magnetic field generated by the current flowing through the coil does not interlink with the input and output external electrodes, resulting in eddy current loss. Can be reduced. As a result, it is possible to obtain a multilayer electronic component with little generation of stray capacitance and excellent electrical characteristics in a high frequency band.

Further, an array type in which a plurality of coils are juxtaposed electrically independent of each other and input external electrodes and output external electrodes connected to each coil are arranged in a staggered manner, The distance between external electrodes adjacent to each other is increased, and crosstalk between adjacent coils can be suppressed.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a first embodiment of a multilayer electronic component according to the present invention.

FIG. 2 is an exemplary perspective view showing the appearance of the multilayer electronic component shown in FIG. 1;

FIG. 3 is a schematic sectional view of the multilayer electronic component shown in FIG. 2;

FIG. 4 is a graph showing impedance characteristics of the multilayer electronic component shown in FIG. 2;

FIG. 5 is an exploded perspective view showing the configuration of a second embodiment of the multilayer electronic component according to the present invention.

FIG. 6 is an exemplary perspective view showing the appearance of the multilayer electronic component shown in FIG. 5;

7 is a schematic cross-sectional view of the multilayer electronic component shown in FIG.

FIG. 8 is an exploded perspective view showing a configuration of a third embodiment of the multilayer electronic component according to the present invention.

FIG. 9 is an exemplary perspective view showing the appearance of the multilayer electronic component shown in FIG. 8;

FIG. 10 is a schematic sectional view of the multilayer electronic component shown in FIG. 9;

FIG. 11 is an exploded perspective view showing the configuration of a conventional multilayer electronic component.

FIG. 12 is an exemplary perspective view showing the appearance of the multilayer electronic component shown in FIG. 11;

FIG. 13 is a schematic cross-sectional view of the multilayer electronic component shown in FIG.

[Explanation of symbols]

21: laminated inductor array 2, 22: insulating sheet 3a to 3d, 23a to 23c, 24a to 24c, 25a
-25c, 26a-26c ... coil conductors 4a, 4b, 27a, 27b, 28a, 28b, 29
a, 29b, 30a, 30b ... Lead-out parts 8, 40 ... Laminated body 8a, 40a ... Mounting surface 31a-34b ... Input external electrode 31b-34b ... Output external electrode 51 ... Multilayer LCL composite component 61a-64a ... Input external electrode 61b to 64b: output external electrode 70: laminated body 70a: mounting surface 71: laminated inductor 72: input external electrode 73: output external electrode L1, L11 to L14, L11a to L14a, L11b
~ L14b ... coil

Claims (3)

[Claims] 1. A stacked body formed by stacking a plurality of insulating material layers and a plurality of coil conductors; and an axis parallel to a stacking direction of the stacked body formed by electrically connecting the coil conductors. And an input external electrode and an output external electrode provided on one side surface of the laminate parallel to the axial direction of the coil and electrically connected to a lead portion of the coil. A multilayer electronic component characterized by the following. 2. The apparatus according to claim 1, wherein a plurality of said coils are juxtaposed electrically independent of each other.
The laminated electronic component as described in the above. 3. The multilayer electronic component according to claim 2, wherein input external electrodes and output external electrodes connected to the respective coils are arranged in a staggered manner.