JPH0993069A - Multiseries noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiseries noise filter in which the electromagnetic interference of noise filter elements is effectively prevented, the rate of integration is improved and the structure of connection with terminal electrodes is simplified. SOLUTION: This multiseries noise filter is constituted by successively laminating 1st insulated layers 11 and 12 where plural meander pattern conductor films 11a, 11b, 21a and 21b on the signal potential side are formed, 2nd insulated layers 12 and 22 where plural meander pattern conductor films 12a, 12b, 22a and 22b on the ground potential side are formed, and 3rd insulated layers 13 and 23 where planar conductor films 13a and 23a on the ground potential side are formed. On a pair of end faces on one side of laminated body, terminal electrodes 51-54 and 61-64 to be connected to both terminals of meander pattern conductor films 11a, 11b, 21a and 21b are arranged and on a pair of end faces on the other side, terminal electrodes 71 and 72 to be connected through the planar conductor films 13a and 23a to a part of meander pattern conductor films 12a, 12b, 22a and 22b are arranged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple noise system in which a noise filter element in which a meander pattern conductor film on the signal potential side and a meander pattern conductor film on the ground potential side face each other is arranged in one laminated body. It is about filters.

[0002]

2. Description of the Related Art Conventionally, a noise filter element in which a meander pattern conductor film on the signal potential side and a meander pattern conductor film on the ground potential side are opposed to each other forms a meander pattern conductor film on the signal potential side. The first insulating layer, the second insulating layer on which the meander pattern conductor film on the ground potential side is formed, and the insulating layer covering the meander pattern conductor film on the signal potential side on the first insulating layer are laminated. Is configured.

Then, both ends of the meander pattern conductor film on the signal potential side are led out to the pair of opposing end faces of the laminated body in which the above-mentioned respective insulating layers are laminated, and the derived portion is connected to the signal potential side. The terminal electrode was arranged. Further, the end portion of the meander pattern conductor film on the ground potential side is bent, and the end portion of the bent meander pattern conductor film on the ground potential side is led out to the other pair of facing end faces of the laminated body. At the same time, the terminal electrode on the ground potential side was arranged.

Generally, when a necessary electronic component element is mounted on a printed wiring board, in order to reduce the number of mounted electronic components, for example, a multiple resistor such as a multiple resistor in which a chip resistor is integrated is used. Parts are sought after.

In this type of noise filter having a meandering pattern conductor film, there is a demand for multiple components, but like a multiple resistor, a plurality of noise filter elements are simply arranged in a plane. Then, the area occupied by the components will increase.

Further, when three or more noise filter elements are arranged in parallel, the connection structure between the noise filter element near the center and the ground potential side terminal electrode becomes complicated, and the characteristics of the noise filter element are not stable. was there.

Further, if an attempt is made to reduce the size by narrowing the interval between the noise filter elements arranged in parallel, electromagnetic interference will occur between the elements, and stable characteristics cannot be derived from each element. was there.

On the contrary, when a plurality of noise filter elements are stacked in the stacking direction, electromagnetic interference is further generated between the respective elements, and stable characteristics cannot be derived from each element.

The present invention has been devised in view of the above problems, and an object thereof is to arrange a plurality of noise filter elements in a planar direction and a stacking direction with a high integration rate and to provide electromagnetic noise of each noise filter. The present invention provides a multiple noise filter that effectively suppresses interference and further simplifies electrical connection between a signal potential side terminal electrode, a ground potential side terminal electrode and each pattern conductor film.

[0010]

In order to solve the above problems, the present invention provides a first insulating layer having a plurality of meander pattern conductor films on the signal potential side, and a meander pattern conductor on the signal potential side. A second insulating layer having a plurality of meander pattern conductor films on the ground potential side facing the film;
A multiple noise filter having a rectangular laminated body in which a plurality of filter bodies formed by sequentially laminating a third insulating layer having a plane conductor film on the ground potential side are laminated, Both ends of the meander pattern conductor film are respectively connected to a plurality of signal side terminal electrodes arranged in parallel on a pair of facing end faces of the laminated body, and one end of each meander pattern conductor film on the ground potential side is a first side. Is connected to the plane conductor film via a via-hole conductor provided in the second insulating layer, and a part of the plane conductor film is connected to the ground-side terminal electrode formed on the other pair of end faces of the laminate. It is a multiple noise filter that is used.

Preferably, each of the plurality of laminated filters has an amount obtained by dividing an interval between the plurality of Miyander pattern conductive films formed on the first insulating layer by the number of laminated layers.
It is a multiple noise filter that is laminated so as to be mutated.

[0012]

According to the present invention, a noise filter element having a meander pattern conductor film on the signal potential side and a meander pattern conductor film on the ground potential side facing each other is arranged in parallel in the plane direction to form a filter body. At the same time, since the filter bodies are stacked in the stacking direction, the multiple noise filter has a high integration rate.

In the stacking direction, a third insulating layer having a planar conductor film on the ground potential side is arranged in order to partition each filter body. Therefore, electromagnetic interference of the noise filters arranged in the stacking direction can be effectively suppressed.

The plane conductor film of the third insulating layer is
The end portions of the plurality of ground potential side meander pattern conductor films formed on the second insulating layer are collectively put together to act as a collecting electrode for connecting to a pair of ground potential side terminal electrodes formed on the end faces of the laminate. Therefore, even if the number of noise filter elements arranged in parallel increases, the connection between the ground potential side meander pattern conductor film and the ground potential side terminal electrode is stabilized.

Further, when the noise filter elements of the filter bodies stacked in the stacking direction are on the same straight line, the individual signal potential side terminal electrodes are short-circuited, but in the present invention, one filter body is used. The distance between the noise filter elements arranged in parallel with each other is divided by the number of layers of the filter body, and the filter body in the stacking direction is mutated,
The noise filter elements arranged in the plane direction and the stacking direction do not overlap each other, electromagnetic interference between the noise filter elements is suppressed, and further, the terminal electrodes arranged on the pair of end faces of the stacked body do not short-circuit. Can be formed.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an external perspective view of a multiple noise filter of the present invention, and FIGS. 2 (a) to 2 (h) are plan views of respective insulating layers constituting a laminated body. In the embodiment, two noise filters are laminated in the stacking direction, and two noise filter elements are arranged in parallel in each filter body. To do.

The multiple noise filter of the present invention comprises the laminated body 1 and the signal potential side terminal electrodes 51, 52, 53, 54, 61, 62, 6 formed on one pair of end faces of the laminated body 1.
3, 64, and ground potential side terminal electrodes 71, 72 formed on the other pair of end faces of the laminated body 1.

The laminated body 1 includes two filter bodies 10 and 2.
The filter body 10 is divided into the first insulating layer 1
The filter body 20 includes a first insulating layer 21, a second insulating layer 22, and a third insulating layer 23. The filter body 20 includes a first insulating layer 21, a second insulating layer 12, and a third insulating layer 13. still,
An insulating layer 100 is deposited on the first insulating layer 11 of the first filter body 10.

The above-mentioned insulating layers 100, 11 to 13, 2
1 to 23 are insulating ceramics such as alumina, glass-ceramics containing insulating ceramics in the glass component, magnetic materials such as Mn-Zn, and BaTiO 3.
Dielectric ceramics such as ₃ can be exemplified.

Between the insulation layer 100 and the first insulation layer 11 of the first filter body 10, for example, on the first insulation layer 11, the meander pattern conductor films 11a, 1a on the signal potential side are provided.
1b is formed. The meander pattern conductor films 11a and 11b on the signal potential side have a substantially linear shape or a meandering shape (hereinafter referred to as meander shape), and both ends thereof are formed so as to be led to a pair of end faces on one side of the insulating layer 11. Has been done.

The first insulating layer 11 of the first filter body 10
And the second insulating layer 12, for example, the second insulating layer 12
The meander pattern conductor film 12 on the ground potential side is on the upper side.
a and 12b are formed. The ground potential side meander pattern conductor films 12a and 12b have a meander shape as a whole and are divided into two parts, each of which is formed on the first insulating layer 11 and has a signal potential side meander pattern conductor film 11a, It is adapted to face a part of 11b.

Also, via-hole conductors 12c and 1c penetrating in the thickness direction of the second insulating layer 12 are provided at one ends of the divided meander pattern conductor films 12a and 12b on the ground potential side.
2d is formed.

The second insulating layer 12 of the first filter body 10
And the third insulating layer 13, for example, the third insulating layer 13
Above, the plane conductor film 1 of the ground potential spread on the plane
3a are formed. A part of the planar conductor film 13a is formed so as to be led out to the pair of end faces on the other side of the third insulating layer 13.

Similarly, the first insulating layer 21, the second insulating layer 22, and the third insulating layer 23 constituting the second filter body 20 are also arranged on the first insulating layer 21 on the meandering side on the signal potential side. The pattern conductor films 21a and 21b are formed on the second insulating layer 22 by the meander pattern conductor films 22a and 2a on the ground potential side.
2b, via-hole conductors 22c and 22d are formed in the thickness direction of the second insulating layer 22, and a plane conductor film 23a on the ground potential side is formed on the third insulating layer 23.

The above-mentioned conductor films 11a, 11b, 12a, 1
2b, 13a, 21a, 21b, 22a, 22b, 23
“A” is formed by using a conductive material containing Ag and Cu as main components.

Here, the difference between the first filter body 10 and the second filter body 20 is that the meander pattern 11 on the signal potential side of the first filter body 10 is different.
a, 11b and the meander pattern conductor films 21a, 21b on the signal potential side of the second filter body 20 and the meander pattern conductor films 12a, 12b on the ground potential side of the first filter body 10 and the second filter. Body 20
Meander pattern conductor films 22a, 2 on the ground potential side of
That is, the formation positions with 2b are displaced respectively.

The amount of this displacement is, for example, the distance X between the meander pattern conductive films 11a and 11b on the two signal potential sides formed on the first insulating layer 11 of the first filter body 10, , 20 stacked layers N (in the figure, N =
It is displaced by the amount divided by 2).

That is, the meander pattern conductor film 11a on the signal potential side formed on the first insulating layer 11 of the first filter body 10 and the first insulating layer 21 of the second filter body 20.
The meander pattern conductor film 21a formed on the signal potential side
Means that it is displaced by X / N.

As described above, in the filter body 10, the meander pattern conductor film 1 on the signal potential side is interposed via the insulating layer 11.
1a and the meander pattern conductor film 12 on the ground potential side
A and a are opposed to each other, and a capacitive component is generated therebetween. Further, the meander pattern conductor film 11a on the signal potential side
Component, the inductance component of the meander pattern conductor film 12a on the ground potential side, and the mutual inductance in a distributed constant manner, which will act as a noise filter element.

Similarly, in the filter body 10, the noise filter element is achieved by the meander pattern conductor film 11b on the signal potential side and the meander pattern conductor film 12b on the ground potential side, and the filter body 20 and the meander pattern conductor on the signal potential side. Two noise filter elements are achieved by the conductor film 21a and the ground potential side meander pattern conductor film 22a, and the signal potential side meander pattern conductor film 21b and the ground potential side meander pattern conductor film 22b.

Both ends of the meander pattern conductor films 11a, 11b, 21a, 21b on the signal potential side of each noise filter element are led out to the pair of opposite end faces of the filter bodies 10, 20 (together with the laminated body) as they are. Will be done.

Meander pattern conductor films 12a, 12b, 22a, 22 on the ground potential side of each noise filter element
One end of b is connected to the plane conductor films 13a and 23a of the third insulating layers 13 and 23 of the filter bodies 10 and 20 through the via-hole conductors 12c, 12d, 22c and 22d, and, in common, Connected planar conductor film 13
A part of a and 23a is led out to the other pair of end faces of the laminated body which face each other.

Side terminal electrodes 51 to 54, 61 on the signal potential side
To 64 are arranged in parallel on one pair of end faces of the laminated body facing each other, and the ground potential side terminal electrodes 71 and 72 are formed on the other pair of end faces of the laminated body facing each other.
Each of the terminal electrodes 51 to 54, 61 to 64, 71 has an underlying thick film conductor layer containing Ag or the like as a main component on each end surface of the laminate,
It is composed of a plating layer of Ni, solder or the like.

The signal potential side terminal electrodes 51, 61 are connected to, for example, both ends of the signal potential side meander pattern conductor film 11a of the filter portion 10, and the signal potential side terminal electrodes 52, 62 are connected.
Is connected to both ends of the meander pattern conductor film 21a on the signal potential side of the filter unit 20, and the signal potential side terminal electrodes 53 and 63 are connected to both ends of the meander pattern conductor film 11b on the signal potential side of the filter unit 10, for example. The signal potential side terminal electrodes 54, 64 are connected to both ends of the meander pattern conductor film 21b on the signal potential side of the filter section 20, for example.

That is, four noise filter elements are arranged in the stack, and the meander pattern conductor films 11a and 11 on the signal potential side of each noise filter element.
b, 21a and 21b are the individual signal side terminal electrodes 5
1 to 54, 61 to 64, and the meander pattern conductor film 12 on the ground potential side of all the noise filter elements
The a, 12b, 22a and 22b are connected to the ground potential side terminal electrodes 71 and 72.

Considering the electromagnetic interference between the noise filter elements, the noise filter elements that are adjacent to each other in a plane, that is, the noise filter element having the meander pattern conductor film 11a on the signal potential side and the signal potential side. The noise filter element having the meander pattern 11b is separated from the noise filter element by the distance X. Similarly, the noise filter element having the meander pattern conductor film 21a on the signal potential side and the noise filter element having the meander pattern 21b on the signal potential side are separated from each other by the distance X. Therefore, by sufficiently separating this distance X, electromagnetic interference between the two can be effectively suppressed.

Between the noise filter elements adjacent to each other in the stacking direction, that is, the noise filter element having the meander pattern conductor film 11a on the signal potential side and the noise filter element having the meander pattern conductor film 21a on the signal potential side are flat. Are separated from each other by X / N, and the plane conductor film 13a is interposed in the stacking direction. Since the plane conductor film 13a has a shielding effect, electromagnetic interference between the two can be effectively suppressed. . Regarding the stacking direction, the noise filter element having the meander pattern conductor film 11a on the signal potential side and the noise filter element having the meander pattern conductor film 22a on the signal potential side are
The same applies to the noise filter element having the meander pattern conductor film 12a on the signal potential side and the noise filter element having the meander pattern conductor film 22a on the signal potential side.

With the above structure, the electromagnetic interference of each noise fill element constituting the multiple noise filter can be effectively suppressed by the planar distance X and the planar conductor film 13a arranged in the stacking direction, so that it can be isolated. The characteristic of the noise filter element can be stably derived.

Further, the ground conductor-side meander pattern conductor films 12a, 12b, 2 formed on the filter bodies 10, 20 by the above-mentioned plane conductor films 13a, 23a.
2a and 22b can be stably led to the other pair of end faces of the laminated body, and even if the number of noise filter elements increases, the terminal electrodes 71 and 72 on the ground potential side do not increase. Further, even when three or more noise filter elements are arranged in each filter section, each noise filter element can be stably connected to the ground potential.

Further, the meander pattern conductor film 12 on the ground potential side is provided through the plane conductor films 13a and 23a.
Since the a, 12b, 22a, 22b and the ground potential side terminal electrodes 71, 72 are connected, the ground potential side meander pattern conductors 12a, 12b, 22a, 22b.
Via hole conductors 12c, 12d, 22c, 22
d only the conductive film 12a, 12b, 22a, 2
It is not necessary to bend 2b, and the area facing the signal potential side meander pattern conductor films 11a, 11b, 21a, 21b can be sufficiently increased.

Next, a method of manufacturing the above noise filter will be briefly described.

First, the insulating layers 11-13, 21-23, 1
Create a green sheet that is 00.

Next, the meander pattern conductor film 1 on the signal potential side is formed on the surface of the green sheet to be the first insulating layers 11 and 21 with a conductive paste containing Ag or Cu as a main component.
A conductor film to be 1a, 11b, 21a, 21b is formed.

Via-hole conductors 12c, 12d, 22c, 22 are formed on the green sheet to be the second insulating layers 12, 22.
A through-hole to be d is formed, and the meander pattern conductor films 11a, 11 on the signal potential side are formed on the surface of the green sheet with a conductive paste containing Ag or Cu as a main component.
b, 21a, 21b to form a conductor film,
A conductor to be the via-hole conductors 12c, 12d, 22c, 22d is formed.

On the surface of the green sheet which becomes the third insulating layers 13 and 23, a conductive film containing Ag or Cu as a main component is used to form a conductive film to become the planar conductive films 13a and 23a on the ground potential side.

Next, considering the stacking order, that is, from the upper side, the green sheet to be the insulating layer 100, the green sheet to be the first insulating layer 11 of the first filter body 10, and the second insulating layer. 12, a green sheet to be the third insulating layer 13, a second filter body 2
0, the green sheet which becomes the 1st insulating layer 21, the green sheet which becomes the 2nd insulating layer 22, and the green sheet which becomes the 3rd insulating layer 23 are laminated, and thermocompression-bonded and integrated.

Next, the laminate is fired under a predetermined firing condition. The firing conditions are an oxidizing atmosphere depending on the metal material and the material of the green sheet forming each conductor film,
A reducing atmosphere or the like is appropriately selected, and the firing peak temperature or the like is appropriately selected depending on the melting point of the metal material forming each conductor film or the sintering temperature of the material of the green sheet.

Next, the fired laminated body is barrel-polished, and from the end face of the laminated body, both ends of the meander pattern conductor films 11a, 11b, 21a, 21b on the side of each signal potential,
Also, a part of the plane conductor films 13a and 23a on the ground potential side is completely exposed.

After that, a thick underlayer conductor film containing Ag as a main component is formed on each end face by baking, and the surface is plated.

Here, since the planar distances (intervals) X of the noise filter elements of the filter body 10 and the filter body 20 are the same, the green sheet is made large enough to extract a plurality of filter bodies. The green sheet that becomes the first insulating layer 11 of the filter body 10 and the green sheet that becomes the first insulating layer 21 of the filter body 20 can be shared, and similarly, the second insulating layers 12, 2
The green sheet to be the second sheet and the green sheet to be the third insulating layers 13 and 23 can be shared respectively. In this case, in the stacking step, when stacking the green sheets that form the second filter body 20, X / X in the direction in which the noise filter elements are juxtaposed with respect to the green sheets that form the first filter body 10. N layers may be shifted by N (distance / (number of laminated layers of filter body)), and then the laminated body of large green sheets may be cut into a predetermined shape.

As described above, in the above description, the multiple noise filter having four noise filter elements (two arranged in parallel and two laminated layers) has been described. The number of stacked layers may be changed arbitrarily.

[0052]

As described above, a noise filter element including a meander pattern conductor film on the signal potential side and a plurality of meander pattern conductor films on the ground potential side facing the meander pattern conductor film on the signal side, Since the filter bodies are laminated in the plane direction and the thickness direction in the laminated body formed by laminating the filter bodies, the multiple noise filter has a high integration rate.

Further, the noise filter elements arranged side by side on the plane and the noise filter elements laminated in the thickness direction are mutually separated by a sufficient distance and the plane conductor film on the side of the ground potential allows electromagnetic interference of the noise filter elements. Can be effectively suppressed, and stable characteristics can be derived.

Further, since the ground potential side meander pattern conductor film of the noise filter element is connected to the ground potential plane conductor film and is connected to the ground potential side terminal electrode of the end face, the ground potential side meander pattern is formed. The shape of the conductor film is simplified, the facing area of each meander pattern conductor film can be easily obtained according to the characteristics, and the terminal electrode on the ground potential side can be minimized. However, stable characteristics can be derived from all the noise filter elements.

Further, since the displacement of the laminated filter bodies is defined by the distance X between the juxtaposed filter elements and the number of laminated filter bodies, electromagnetic interference in the laminating direction can be reduced, and the optimum The distance X is maintained, and a multiple noise filter having an extremely high integration rate is obtained.

[Brief description of drawings]

FIG. 1 is an external perspective view of a multiple noise filter of the present invention.

2 (a) to (g) are plan views of exploded layers of the multilayered noise filter stack of the present invention.

[Explanation of symbols]

10, 20 ... Filter main body 11, 21 ... First insulating layer 11a, 11b, 21a, 21b ... Meander pattern conductor film on signal potential side 12, 22 ... Second insulating layer 12a, 12b, 22a, 22b ... Meander pattern conductor film on ground potential side 13, 23 ... Third insulating layer 13a, 23a ... Planar conductor film on ground potential side 51-54, 61- 64 ・ ・ ・ Signal potential side terminal electrodes 71, 72 ・ ・ ・ ・ ・ ・ ・ ・ ・ Ground potential side terminal electrodes

Claims (2)

[Claims] 1. A first insulating layer on which a plurality of meander pattern conductor films on the signal potential side are formed, and a plurality of meander pattern conductor films on the ground potential side facing the meander pattern conductor film on the signal potential side are formed. A multiple noise filter having a rectangular laminated body in which a plurality of filter bodies each of which is formed by sequentially laminating a second insulating layer and a third insulating layer on which a planar conductor film on the ground potential side is laminated are provided. Both ends of each meander pattern conductor film on the signal potential side are
A via hole provided in the second insulating layer, wherein one end of each meander pattern conductor film on the ground potential side is connected to a plurality of signal side terminal electrodes arranged in parallel on a pair of opposing end faces of the laminate. It is connected to the plane conductor film via a conductor, and a part of the plane conductor film is connected to the ground-side terminal electrodes formed on the other pair of end faces of the multilayer body. Continuous noise filter. 2. The filter body is laminated such that the distance between a plurality of the Miyander pattern conductor films formed on the first insulating layer is divided by the number of laminated layers of the filter body, and the filter bodies are mutated. The multiple noise filter according to claim 1, wherein the multiple noise filter is provided.