JP2002319835A - Lc composite component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LC composite component the mount area of which is reduced. SOLUTION: A plurality of blocks 50 each formed by layering the 1st and 2nd filter circuits 10, 20 in a vertical direction are arranged to connect opposing end faces 50A, 50A. Earth electrodes 70, 70 formed in common to the 1st and 2nd filter circuits 10, 20 of each block 50 are connected, parts 4g, 4g, 9g, 9g exposed to other opposing end faces 50B, 50B are shifted to each other in a direction of the opposing end faces 50A, 50A in the 1st and 2nd filter circuits 10, 20 layered vertically. The 1st and 2nd filter circuits 10, 20 are formed in linear symmetry with respect to a center line O between the other opposing end faces 50B, 50B. A dielectric magnetic hybrid layer 5 on which a plane conductor 5c is formed and connected to the earth electrodes 70, 70 is provided between the 1st and 2nd filter circuits 10, 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LC composite component used for removing noise from electronic equipment.

[0002]

2. Description of the Related Art Conventionally, various LC composite parts having a monolithic structure by combining an inductor and a capacitor have been proposed and put to practical use. As the prior art, there is an LC composite component as disclosed in Japanese Patent Application Laid-Open No. 10-126192, for example. In this LC composite component, a conductor pattern is formed on a plurality of dielectric magnetic material mixed layers (insulating base layers) made of a composite material in which a dielectric ceramic powder and a magnetic ferrite powder are mixed at a predetermined ratio. A plurality of filter circuits in which two coil conductors and a capacitor are formed in a laminate by laminating them are connected to each other by opposing end surfaces thereof, and a plurality of filter circuits are arranged, so that a ground electrode for a plurality of filter circuits is shared. It was done. Such an LC composite component can utilize a capacitance distributed between two coil conductors forming an inductor as a filter element, and since a capacitor is provided between the two coil conductors, a wide range of frequencies can be obtained. It can be used for noise removal. Moreover, since a plurality of filter circuits having a common ground electrode are built in, a plurality of filter circuits can be mounted on the circuit board with a relatively small mounting area.

[0003]

However, in the above-described LC composite component, since the opposing end faces of a plurality of filter circuits are connected and arranged in a plurality, the number of the connected filter circuits is reduced. However, the mounting area has been required to the extent necessary, and it has not been possible to meet the recent demand for further reduction in the mounting area.

[0004] The present invention has been made in view of the above problems, and an object of the present invention is to provide an LC composite component capable of reducing a mounting area.

[0005]

In order to solve the above-mentioned problems, the present invention provides a method in which a conductor pattern is formed and laminated on a plurality of insulating base layers, and a plurality of different base layers are provided. By forming the formed strip-shaped conductor pattern in a conductive state between the layers, the coil conductor formed in a coil shape that advances in the laminating direction is formed so as to overlap in the laminate, and is formed on a plurality of different base layers. An LC composite component having a filter circuit in which a capacitor is formed with a conductor pattern sandwiching the base layer, wherein a plurality of the filter circuits are vertically stacked. With such a configuration, the LC composite component is formed by laminating a plurality of filter circuits in a vertical direction (lamination direction).
The mounting area can be reduced as compared with an LC composite component in which a plurality of filter circuits are connected in a line.

Further, in the present invention, a plurality of blocks in which a plurality of the filter circuits are stacked in the vertical direction are arranged so as to connect one end face of one of the blocks to each other, and one of the blocks is opposed to one of the blocks. Each exposed portion of the conductor pattern of the plurality of filter circuits exposed on the end face is connected to an adjacent block and connected to a ground electrode commonly formed for the plurality of blocks. The exposed portions of the conductor patterns of the plurality of filter circuits, which are respectively exposed on the opposite end faces, are shifted from each other in the opposing direction of one opposing end face between the filter circuits stacked in a plurality of vertical directions, and the terminal electrodes are respectively disposed. Is connected to the terminal. With such a configuration, the plurality of blocks constituting the LC composite component are each formed by laminating a plurality of filter circuits in the up-down direction (lamination direction). Thus, the number of blocks is determined according to the number of blocks arranged. Thereby, by increasing the number of blocks to be connected and arranged and the number of filter circuits stacked in the vertical direction in each block, the number of filter circuits built in the LC composite component can be significantly increased. This leads to a reduction in the mounting area. Further, since the exposed portions of the conductor pattern exposed on the other facing end surfaces of the respective blocks are shifted from one another in the vertically stacked filter circuits, a pair of terminal electrodes for one filter circuit is formed. The position can be easily secured, and no trouble occurs.

[0007] The present invention also provides the above-mentioned filter circuit, wherein the plurality of filter circuits include a capacitor located at the center between the opposed end faces, and two coils located on both sides of the capacitor near the opposed end faces. And a conductor pattern of the filter circuit is formed so as to be symmetric with respect to a center line between the opposed end faces. With such a configuration,
The electrical characteristics of the individual filter circuits can be matched,
As a result, it is easy to make the electrical characteristics of the LC composite component, which is an aggregate of the filter circuits, uniform.

Further, the present invention is characterized in that an insulating base layer having a planar conductor pattern connected to the ground electrode is provided between the plurality of filter circuits. With such a configuration, it is possible to effectively suppress electromagnetic interference between a plurality of filter circuits stacked in the vertical direction.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows L according to the present embodiment.
FIG. 2 is an exploded perspective view of the C composite component, and FIG. 2 is an external perspective view of the LC composite component.

The LC composite part 100 according to the present embodiment is
As shown in FIGS. 1 and 2, two filter circuits 10,
Block 50 having one of its opposite end faces 5
0A and 50A are connected to each other and arranged in a plurality, and the terminal electrodes 60... 61 61. Earth electrodes 70, 70 formed
And has a substantially rectangular parallelepiped appearance.
A plurality of blocks 50 constituting the LC composite part 100
.. Indicate the upper surface of a plurality of dielectric magnetic material mixed layers (insulating base layers) made of a composite material having a substantially rectangular parallelepiped appearance and a mixture of dielectric ceramic powder and magnetic ferrite powder at a predetermined ratio. In addition, two filter circuits 10 and 20 formed by forming and laminating a conductor pattern having a shape shown by hatching in FIG. 1 are vertically laminated (laminated direction).

Here, the plurality of blocks 50 constituting the LC composite component 100 have the same configuration, and in the present embodiment, one block 50 is used.
Will be described only. The block 50 is formed by laminating, for example, nine dielectric magnetic material mixed layers 1 to 9 between the upper and lower cover sheets 30 and 31, of which the dielectric magnetic material mixed layers 1, 2, 3, and 4 are stacked. The first filter circuit 10 is formed, and the dielectric / magnetic material mixed layers 6, 7, 8, 9 form the second filter circuit 20.

A pair of strip-shaped conductor patterns 1a, 1a, 2b, 2c, 3d, and 4c are provided on the upper surfaces of the dielectric / magnetic mixed layers 1, 2, 3, 4 constituting the first filter circuit 10 at positions near the other facing end surfaces 50B, 50B, respectively. 1b, 2a, 2b, 3a, 3b, 4
a, 4b are formed, and a pair of strip-shaped conductor patterns 1a, 1b, 2a,
2b, 3a, 3b, 4a, 4b are through holes 1
By being electrically connected via the conductive paste filled in d, 1e, 2d, 2e, 3d, and 3e, the coil conductors formed in a coil shape that respectively advance in the stacking direction (vertical direction) They are wound in opposite directions so as to overlap in the laminate.

A pair of strip-shaped conductor patterns 4a and 4b formed on the dielectric / magnetic mixed layer 4 located at the lowermost layer of the first filter circuit 10 are exposed on the other facing end surfaces 50B and 50B, respectively. It has exposed parts 4g, 4g, and this exposed part 4g, 4g
In the facing direction X of A and 50A (the left-right direction shown in FIG. 1), they are located on the left side shown in FIG.

In the dielectric / magnetic mixed layers 1, 2, 4, the opposing direction Y of the other opposing end faces 50B, 50B.
Planar conductor patterns 1c, 2c, 4c are formed in the central portion (in the depth direction shown in FIG. 1) so as to extend in parallel with the opposing direction X of the one end faces 50A, 50A. Conductor pattern 1c, 2c, 4c
Thus, a capacitor is formed with the dielectric / magnetic material mixed layer interposed therebetween. The pair of strip-shaped conductor patterns 1a and 1b formed on the dielectric / magnetic material mixed layer 1 are connected to each other by a planar conductor pattern 1c.

Here, in the planar conductor patterns 2c, 4c formed on the dielectric / magnetic material mixed layers 2, 4, one opposing end face 50A, 50A and one opposing end face 50B, 50B respectively. Has exposed portions 2f, 2f, 4f, and 4f respectively exposed at the central portion in the facing direction Y.

The first filter circuit 10 having the above-described configuration includes the other opposing end surfaces 50B, 50B of the block 50.
And two coil conductors located near the other opposing end faces 50B, 50B on both sides of the capacitor formed by the planar conductor patterns 1c, 2c, 4c arranged at the center between the 50Bs. Will be.

Moreover, each of the dielectric / magnetic mixed layers 1, 2,
The conductor patterns 3 and 4 have conductor patterns formed so as to be line-symmetric with respect to the center line O between the other facing end surfaces 50B and 50B, respectively. The other opposing end surfaces 50B, 5
0B, passes through a capacitor located at the center of the first end face 50B, and is located at the center between the other end faces 50B, 50B, and is parallel to the opposing direction X of one of the opposing end faces 50A, 50A (the other opposing end faces 50B, 50B). The filter circuit 10 is configured to be line-symmetric with respect to the center line O perpendicular to the opposing direction Y of 50B.

The second filter circuit 20 has the same configuration as that of the first filter circuit 10, and includes a pair of band-shaped conductors formed in each of the dielectric / magnetic material mixed layers 6, 7, 8, and 9. Patterns 6a, 6b, 7a, 7b, 8a, 8b, 9
a, 9b form two coil conductors, and
Capacitors are formed by the planar conductor patterns 6c, 7c, 9c formed on the dielectric / magnetic mixed layers 6, 7, 9 to sandwich the dielectric / magnetic mixed layer.

Further, the conductor pattern 6 is formed so as to be symmetrical with respect to a center line O passing through a capacitor located between the other facing end faces 50B of the block 50.
a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 6
The conductor patterns 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9
b, 6c, 7c, 9c are one end face 50A, 50
The first filter circuit 10 has a shape that is inverted with respect to the opposite direction X of A.

That is, in the lowermost dielectric magnetic mixed layer 9 of the second filter circuit 20 corresponding to the lowermost dielectric magnetic mixed layer 4 of the first filter circuit 10, the strip-shaped conductor patterns 9a, 9b other facing end face 50
The exposed portions 9g, 9g exposed to B, 50B are located closer to the right side as shown in FIG. 1 in the facing direction X of the one facing end surfaces 50A, 50A.

As a result, the exposed portions 4g exposed on the other opposed end faces 50B, 50B of the first and second filter circuits 10, 20 stacked vertically in the block 50.
4g, 9g, 9g are the first and second filter circuits 1
0 and 20 are shifted from each other with respect to the facing direction X of one facing end face 50A.

The first and second filter circuits 10 and 20 stacked in the vertical direction in the block 50 are stacked so that the dielectric / magnetic mixed layer 5 is sandwiched therebetween. In the dielectric / magnetic material mixed layer 5, a planar conductor pattern 5c is formed on substantially the entire surface except for the outer peripheral edge, and one opposing end face 50A, 50A is formed on one opposing end face 50B, 50B. It has exposed portions 5f, 5f respectively exposed at the center in the facing direction Y.

The block 50 constructed as described above
Are arranged in such a manner that the one opposed end faces 50A are connected to each other. At this time, the blocks 50 arranged in a plurality and connected to each other are exposed to the exposed portions 2 of the conductor patterns of the first and second filter circuits 10 and 20 that are exposed on the one opposed end faces 50A and 50A to be connected.
f, 2f, 4f, 4f, 5f, 5f, 7f, 7f, 9
f, 9f (the exposed portions 2f, 2f, 4f, 4f of the planar conductor patterns 2c, 4c of the dielectric / magnetic mixed layers 2, 4 of the first filter circuit 10, the second filter circuit 20
Planar conductor pattern 7 of dielectric / magnetic material mixed layers 7, 9
The planar conductor pattern 5c of the dielectric / magnetic mixed layer 5 located between the first filter circuit 10 and the second filter circuit 20 between the exposed portions 7f, 7f, 9f, 9f of the c and 9c.
Exposed portions 5f, 5f) are connected to each other between adjacent blocks 50.

In each block 50, the first and second filter circuits 10, 2 stacked in the vertical direction
0, one end face 50A, 5 of one of the blocks 50
A conductive paste is applied to each of the exposed portions 4g, 4g, 9g, and 9g of the conductor pattern shifted from each other with respect to the opposing direction X of 0A and baked, so that a pair of terminal electrodes corresponding to the first filter circuit 10 are formed. 60,
A pair of terminal electrodes 62 and 63 corresponding to 61 and the second filter circuit 20 are formed for each block 50.

Further, one of the opposed end faces 50A, 50A
In the blocks 50 located at both ends of the plurality of blocks 50 connected to each other, the exposed conductor pattern is exposed on one end face 50A not connected to the adjacent block 50 among the one end faces 50A, 50A. The ground electrode 70 is formed by applying and baking a conductive paste so as to include the parts 2f, 4f, 5f, 7f, 9f. The ground electrode 70 has exposed portions 2f and 4 of the conductor pattern exposed on one end face 50A.
f, 5f, 7f, and 9f are adjacent blocks 50
Since they are connected to each other, they serve as a common ground electrode for the first and second filter circuits 10 and 20 of each block 50, and have a substantially rectangular parallelepiped shape as shown in FIG.
C composite parts will be obtained.

The LC composite component 1 configured as described above
00, the plurality of blocks 50... Constituting the LC composite component 100 are formed by stacking the first and second filter circuits 10 and 20 in the vertical direction, respectively. The mounting area can be reduced to about half as compared with a case where a plurality of arrays are connected so as to be connected with one facing end face, which leads to a reduction in mounting area. In other words, if the mounting area is the same as the conventional one, the number of filter circuits built in the LC composite component 100 can be approximately doubled.

The exposed portions 4g of the conductor pattern exposed on the other opposing end surfaces 50B, 50B of each block 50,
Since 4g, 9g, 9g are shifted from each other between the first and second filter circuits 10, 20 which are vertically stacked, positions for forming the terminal electrodes 60, 61, 62, 63 are easily secured. It does not cause any problems.

Further, the first and second filter circuits 10 and 20 constituting the block 50 are respectively provided with a capacitor located at the center between the other facing end surfaces 50B and 50B, and a capacitor on both sides of the capacitor. And two coil conductors located near the other opposing end faces 50B, 50B. The first and second filter circuits 10, 2
0 is formed so as to be line-symmetric with respect to the center line O between the other facing end faces 50B, 50B, so that the first and second filters constituting each block 50 are formed. Since the electrical characteristics of the circuits 10, 20 can be made uniform, the first and second filter circuits 10, 20
It is easy to make the electrical characteristics of the entire LC composite component 100, which is an aggregate of the above, uniform. Moreover, in the first and second filter circuits 10 and 20 constituting each block 50, the positions of the exposed portions 4g, 4g, 9g and 9g of the conductor pattern exposed on the other facing end surfaces 50B and 50B respectively are as follows. The one end surfaces 50A, 50A are aligned in the opposing direction X, and a pair of terminal electrodes 60, 61 (6) corresponding to the first filter circuit 10 (second filter circuit 20).
2, 63) can be easily confirmed.

Further, between the first and second filter circuits 10 and 20 constituting each block 50..., A planar conductor pattern 5c connected to the ground electrodes 70 and 70 is formed. Since the layers 5 are stacked, it is possible to effectively suppress electromagnetic interference between the first and second filter circuits 10 and 20 that are vertically stacked in each block 50.

Here, in the LC composite component 100, the dielectric / magnetic mixed layers 1 to 9 constituting the plurality of blocks 50 are made of the same material, and have a constant magnetic permeability and a constant dielectric constant. A composite material having a composite material is used, and a method of producing the composite material according to the following first to fifth steps is preferable.

[First Step] First, as a dielectric material,
PbO, La ₂ O ₃ , ZrO ₂ , and TiO ₂ are wet mixed and mixed.
After firing at 150 ° C. for 2 hours, wet milling is performed to prepare a powder having an average particle size of about 0.1 μm. This composition is Pb _0.88 L
a _0.12 Zr _0.7 Ti _0.3 O _3.06 . [Second step] NiO, ZnO, C
uO and Fe ₂ O ₃ are wet-mixed, fired at 1000 ° C. for 2 hours, and wet-milled to prepare a powder having an average particle size of about 0.1 μm. This composition is Ni _0.24 Zn _0.22 Cu _0.06 Fe
_0.96 O _1.96 .

[Third Step] Next, a dielectric material and a magnetic material are mixed at a weight ratio of 40:60 to obtain a composite ceramic material. The firing temperature of this material is 1030 ° C
Before and after. In addition, an improving material may be used for the purpose of suppressing the firing reaction between the dielectric and the magnetic material and lowering the firing temperature. The improving material is, for example, Cd as a composition.
An _{O-ZnO-B 2 O 3} , CdO, ZnO, B 2 O 3 to 1: 1: After mixing 1 molar ratio, was calcined for one hour at 900 ° C., milled, average particle size of about 0. A 1 μm powder is mixed with a dielectric material, a magnetic material, and a modifier at a weight ratio of 40: 60: 1.5, respectively. The firing temperature of this material is around 1030 ° C.

[Fourth Step] Next, a dielectric magnetic material mixed layer is formed by a printing method using a paste kneaded together with a binder and a binder solvent which can be gasified during firing. Instead of this printing method, a slurry mixed with a binder and a solvent for a binder and milled may be used as a raw material, and a dielectric magnetic mixed layer may be formed by a doctor blade or the like.

A through hole is formed at the connecting position between the strip-shaped conductor patterns of the thus formed dielectric / magnetic mixed layer. Next, the conductor paste is printed. If necessary, a predetermined number of dielectric / magnetic material mixed layers are laminated while filling the through holes with a conductive paste. After the obtained laminate is molded under pressure, it is cut into chips and fired to obtain a fired body. [Fifth Step] A terminal electrode and a ground electrode are formed by applying and baking a conductive paste to the end surface of the fired body, thereby forming an LC composite component.

In this embodiment, the number of stacked filter circuits in the vertical direction in each block 50 is two, but one block is formed by stacking three or more filter circuits in the vertical direction. You may. Also,
In the present embodiment, as the insulating base layer having the conductive pattern formed thereon, a dielectric magnetic material mixture made of a composite material obtained by mixing a dielectric ceramic powder and a magnetic ferrite powder at a predetermined ratio was used. Instead of the dielectric ceramic powder, another dielectric material, or another magnetic material instead of the magnetic ferrite powder may be used, and further, a resin or the like may be used. Further, the base layer may be formed only of a dielectric or a magnetic substance, instead of the base layer made of a composite material, or the base layer may be formed of only glass.

[0036]

As described above, according to the present invention,
Since the LC composite component is formed by laminating a plurality of filter circuits in the vertical direction, the mounting area can be reduced as compared with an LC composite component in which a plurality of filter circuits are connected in a line.

Further, according to the present invention, since a plurality of blocks constituting the LC composite component are formed by laminating a plurality of filter circuits in the vertical direction, a plurality of filter circuits are stacked in the vertical direction. It is determined according to the number of arranged blocks. As a result, by increasing the number of blocks to be connected and arranged and the number of filter circuits stacked in the vertical direction of each block, the number of filter circuits incorporated in the LC composite component can be significantly increased. Therefore, the mounting area can be reduced. Further, since the exposed portions of the conductor pattern exposed on the other facing end surfaces of the respective blocks are shifted from one another in the vertically stacked filter circuits, a pair of terminal electrodes for one filter circuit is formed. The position can be easily secured, and no trouble occurs.

Further, according to the present invention, since the conductor pattern of the filter circuit is formed so as to be line-symmetric with respect to the center line between the other facing end faces, the electrical characteristics of each filter circuit are And the electrical characteristics of the LC composite component, which is an aggregate of the filter circuits, can be easily adjusted.

Further, according to the present invention, an insulating base layer having a planar conductor pattern connected to a ground electrode is provided between a plurality of filter circuits.
Electromagnetic interference between a plurality of filter circuits stacked in the vertical direction can be effectively suppressed, and an LC composite component having excellent electrical characteristics can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view for explaining an LC composite component according to an embodiment.

FIG. 2 is an external perspective view of the LC composite component according to the embodiment.

[Explanation of symbols]

1-9 dielectric magnetic material mixed layer 1a, 1b, 2a, 2b, 3a, 3b, 4a, 4b, 6
a, 6b, 7a, 7b, 8a, 8b, 9a, 9b Strip conductor patterns 1c, 2c, 4c, 5c, 6c, 7c, 9c Planar conductor patterns 2f, 4f, 5f, 7f, 9f Exposed portions of exposed planar conductor pattern 4g, 9g Exposed portions of strip-shaped conductor pattern exposed on other opposed end faces 10 First filter circuit 20 Second filter circuit 50 Block 50A One opposed end face 50B Other opposed face End faces 60, 61, 62, 63 Terminal electrode 70 Earth electrode 100 LC composite component O Center line X Opposition direction of one opposing end face Y Opposition direction of another opposing end face

Claims (4)

[Claims] 1. A lamination direction in which conductive patterns are formed and laminated on a plurality of insulating base layers, and a strip-shaped conductive pattern formed on a plurality of different base layers is made conductive between the layers. A filter circuit in which coil conductors formed in a coil shape proceeding to the above are formed so as to overlap in a laminate, and a capacitor is formed by sandwiching the base layer with a plurality of planar conductor patterns formed on a plurality of different base layers. An LC composite component comprising: a plurality of the filter circuits stacked in a vertical direction. 2. The LC composite component according to claim 1, wherein a plurality of blocks in which a plurality of the filter circuits are vertically stacked are arranged so as to connect one end face of one of the blocks. Each exposed portion of the conductor pattern of the plurality of filter circuits exposed on one of the opposing end faces of the block is connected to an adjacent block and connected to an earth electrode commonly formed for the plurality of blocks. The exposed portions of the conductor patterns of the plurality of filter circuits that are connected to each other and are exposed on the other facing end surfaces of the blocks are respectively arranged in a plurality of vertically stacked filter circuits. An LC composite component which is shifted from each other and connected to terminal electrodes. 3. An LC according to claim 1 or claim 2.
In the composite component, the plurality of filter circuits include a capacitor located at the center between the opposing end faces, and two coil conductors located near the opposing end faces on both sides of the capacitor. An LC composite component, wherein a conductor pattern of the filter circuit is formed to be line-symmetric with respect to a center line between the opposed end faces. 4. The LC composite component according to claim 1, wherein the LC composite component has an insulating property in which a planar conductor pattern connected to a ground electrode is formed between the plurality of filter circuits. An LC composite component comprising a base layer.