JPH09181550A - Laminated noise filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise filter which is capable of lengthening the conductor pattern of a meandering pattern and widening the area of the opening parts of two conductor patterns, within a laminated body. SOLUTION: This filter is composed of meandering first conductor patterns 6 which are arranged between the insulators 1a to 1h of a laminated body 1 and whose tip parts extend to the pair of short side end faces 1A and 1B of the laminated body 1 and meandering second conductor patterns 7 the parts of which are arranged so as to be opposed to the first conductor patterns 6 by holding the insulator layers 1a to 1h between the insulator layers 1a to 1h of the laminated body 1 and whose tip parts extend to the long side end faces 1C and 1D of the laminated body 1, between the layers of rectangular parallelopiped shaped laminated bodies 1a to 1h in which plural insulator layers 1a to 1h are laminated. In this case, the meandering amplitude directions of the first and second conductor patterns 6 and 7 are made the sane direction as the longitudinal direction of the laminated body 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated noise filter for removing high frequency noise generated in a digital circuit or the like.

[0002]

2. Description of the Related Art Conventionally, a laminated noise filter has a laminated body formed by laminating a plurality of insulator layers, a first conductor pattern forming the signal side coil conductor, and a first side conductor forming a ground side coil conductor. It was composed of two conductor patterns.

The first conductor pattern and the second conductor pattern were partially opposed to each other with a predetermined insulator layer interposed therebetween.

As a result, a coil component on the signal side is formed by the first conductor pattern and a coil on the ground side is formed by the second conductor pattern, and a predetermined capacitance component is generated between the two.

Therefore, in this laminated body, a distributed constant type noise filter has been achieved by the equivalent inductance component generated by each coil, the mutual inductor component, and the equivalent capacitance component.

The shapes of the above-mentioned first and second conductor patterns and the connection structure thereof will be described. The first conductor pattern and the second conductor pattern are formed between one insulating layer,
The conductor pattern is less than about 1 turn, and one end of the conductor pattern is formed by a via-hole conductor formed so as to penetrate through one or two insulator layers in the thickness direction of another conductor layer. Connected to the end. That is, in the first conductor pattern and the second conductor pattern, a plurality of patterns are spirally connected in the thickness direction of the laminated body so that the signal-side coil component and the ground-side coil component having a predetermined number of turns in the laminated body. And are arranged in parallel, and the signal side coil component and the ground side coil component are capacitively coupled to each other.

Further, another connection structure of the first conductor pattern and the second conductor pattern is a pattern (for example, meander pattern) which meanders and advances between one insulating layer (see, for example, Japanese Patent Laid-Open No. Hei 4). No. 271610), one end or both ends thereof are led out from the end face of the laminate in which the insulating layers in which the conductor patterns are arranged are exposed. For example, both ends of the first conductor pattern forming the signal-side coil component extend to a pair of end faces facing each other out of the four end faces of the laminated body, and the second conductor pattern forming the ground-side coil component. Of the four end faces of the laminated body extend to one or both of the other pair of end faces facing each other.

Next, the structure of each coil component and the terminal electrode will be described. In any case, of the four end faces of the laminate, one pair of opposing end faces has a signal side. Terminal electrodes are formed which are respectively connected to the ends of the coil components. In the former connection structure, the end portion of the via-hole conductor extending to the surface of the laminated body is formed with a leading conductor film extending to the terminal electrode,
The latter connection structure can be achieved by forming a terminal electrode on the end of the conductor pattern led to the end face.

[0009]

Generally, in the former noise filter, since each conductor pattern is connected to the via-hole conductor which penetrates the thickness of the insulating layer, the manufacturing method, that is, the step of forming the via-hole conductor is complicated. The connection configuration between the via-hole conductor and the conductor pattern has a problem that the connection reliability is reduced.

On the other hand, the latter noise filter is
Since the end of each conductor pattern is formed so as to extend directly to the end of the laminated body, there is no need to use a via-hole conductor, and the manufacturing method and the terminal electrode and connection structure are very easy. was there.

However, in the latter noise filter, the planar occupying area of the first conductor pattern and the second conductor pattern is restricted in an electronic component whose shape is miniaturized. Further, the first conductor pattern forming the signal side coil component is led out to a pair of opposing end faces of the laminated body, and the second conductor pattern forming the ground side coil component is formed on the other side of the laminated body. The extension direction of the end portion of the first conductor pattern and the extension direction of the second conductor pattern are orthogonal to each other so as to be led out to the pair of opposed end faces. That is, in the conventional structure of Japanese Patent Laid-Open No. 4-271610, the second conductor pattern has a portion facing the first conductor pattern and a portion having a relatively long conductor length not facing the first conductor pattern. Will exist. In other words, the second conductor pattern is integrated with a region that operates in a distributed constant and a region that conducts in a lumped constant, which reduces noise filter characteristics, for example, deterioration of the attenuation pole in a high frequency region. I was invited.

As described above, the latter noise filter is
This routing pattern narrows the formation regions of the first and second conductor patterns that face each other, and has a limit to downsizing, and also reduces the characteristics due to the reduction of the facing area, and further adds a lumped constant. There was a deterioration in the characteristics.

The present invention has been devised in view of the above problems, and an object thereof is to maximize the conductor lengths of the first and second conductor patterns and the opposing area of both patterns. That is, it is possible to provide a noise filter capable of coping with miniaturization.

[0014]

According to the present invention, a rectangular parallelepiped laminate formed by laminating a plurality of insulator layers,
A meandering first conductor pattern that is arranged between the insulator layers of the laminate and has an end portion extending to a pair of end faces of the laminate body; and an end portion that is arranged between the insulator layers of the laminate body. Are formed on the pair of meandering second conductor patterns extending to the other pair of end faces of the laminate, and on the pair of end faces on the short side of the laminate, and at the ends of the first conductor pattern. The first conductor pattern includes a pair of signal-side terminal electrodes connected to each other, and a ground-side terminal electrode formed on an end face on the long side of the laminated body and connected to one end of the second conductor pattern. In a laminated noise filter in which a first conductor pattern and a second conductor pattern are opposed to each other with the insulator layer interposed therebetween, the amplitude direction of the meandering first and second conductor patterns is the longitudinal direction of the laminate. Stacked type, characterized by being in the same direction as the direction Is Zufiruta.

[0015]

With the above construction, in the above-described meandering structure of the first conductor pattern, the meandering extending direction, that is, the meandering amplitude direction is the longitudinal direction of the laminate. As a result, both ends of the first conductor pattern are directly led from the extended portion in the meandering amplitude direction to the end faces of the short sides of the laminate as they are. Further, the end portion of the second conductor pattern is led to the end face of the long side of the laminate directly from the outermost pattern of the conductor pattern having the meandering amplitude, that is, the pattern closest to the long side of the laminate. Therefore, the entire second conductor pattern substantially faces the first conductor pattern, and unlike the conventional case, the end portion of the second conductor pattern does not face the first conductor pattern, Since it is not necessary to form a routing pattern for connecting to the ground-side terminal electrode, the facing area can be efficiently improved.

Moreover, since there is no dead space for forming the routing pattern of the second conductor pattern, the area occupied by the first conductor pattern and the second conductor pattern is improved, and the planar shape of the same laminate is improved. In, it is possible to increase the conductor length of the first and second conductor patterns,
Moreover, the facing area can be increased.

Further, the second conductor pattern extends directly from the outermost pattern of the meandering amplitude conductor pattern of the laminate to the ground side terminal electrode, and the entire conductor length of the second conductor pattern is distributed constant. Since it has a wide operating range, the attenuation pole in the high frequency range is never deteriorated as compared with the conventional case.

After all, it is possible to cope with miniaturization, and it is possible to achieve a noise fill that is characteristically satisfactory.

[0019]

DETAILED DESCRIPTION OF THE INVENTION The noise filter of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an external perspective view of a filter of the present invention, FIG. 2 is an exploded perspective view of a laminated portion of a noise filter, and FIGS. 3A and 3B are first conductor patterns of the present invention. FIG. 4 is a plan view of the second conductor pattern, and FIG. 4 is an equivalent circuit diagram.

In FIG. 1, 1 is a plurality of insulator layers 1a,
1h is a rectangular parallelepiped laminated body formed by laminating and integrating 1b, 1c ... 1h, and 2 and 3 are signal sides formed on a pair of opposing short side end faces 1A and 1B of the rectangular parallelepiped laminated body 1. And 4 is a ground-side terminal electrode formed on the pair of opposing long side end faces 1C and 1D of the rectangular parallelepiped laminate 1. In the figure, only the end face 1C is formed, and a ground side terminal electrode may be formed on the end face 1D so as to be connected to the terminal electrode 4.

The laminated body 1 comprises insulator layers 1a, 1b, 1c.
..1h is laminated. Among these insulator layers, for example, between the insulator layers 1b and 1c, that is, on the insulator layer 1c, the signal-side conductor pattern 6 that is the first conductor pattern is arranged. Similarly, the insulator layer 1d
The signal side conductor pattern 6 is also arranged between the insulating layers 1g and 1e and between the insulating layers 1g and 1h.

Of the insulating layers, for example, between the insulating layers 1a and 1b, that is, on the insulating layer 1b, a second layer is formed.
The ground-side conductor pattern 7, which is the conductor pattern, is arranged. Similarly, the ground-side conductor patterns 7 are also arranged between the insulating layers 1c and 1d, between the insulating layers 1e and 1f, and between the insulating layers 1g and 1h.

Insulator layers 1a to 1h constituting the laminated body 1
Examples of the insulating material include alumina, glass-ceramic, and other insulating materials, TiO ₂ -based dielectric ceramics and other dielectric materials, and magnetic material-containing magnetic material materials. Can be made of the same material as a whole, or a specific insulator layer, for example, insulator layer 1
It is also possible to replace a and 1h with an insulating material having high strength.

This laminated body 1 is mainly composed of Ag-based (Ag simple substance, Ag alloy) material in accordance with the green sheets to be the dielectric layers 1a to 1h and the green sheets to be the insulating layers 1a to 1h. A conductive film to be the signal side conductor pattern 6 and the ground side conductor pattern 7 is formed by printing using a conductive paste to be formed, and such green sheets are sequentially laminated and integrated, and formed by a firing process.

The terminal electrodes 2, 3, 4 are respectively provided on the four end faces 1A, 1B, 1C, 1D of the rectangular parallelepiped laminated body 1.
Are formed. The terminal electrodes 2, 3 and 4 are formed by baking Ag-based (Ag simple substance, Ag alloy) conductive paste on each end face of the laminate 1 to form a surface plating film.

The terminal electrodes 2 and 3 are formed on the end faces 1A and 1B on the short side of the laminated body 1 and serve as signal side terminal electrodes, and the terminal electrode 4 is on the long side of the laminated body 1. End face 1C
And becomes a terminal electrode on the ground side.

The shape of the signal side conductor pattern 6 will be described with reference to FIG. 3A, the signal side conductor pattern 6 formed on the insulator layer 1c will be described as an example.

The signal-side conductor pattern 6 extends on the rectangular insulating layer 1c and has one end extending to one side of the pair of short sides of the insulating layer 1c, for example, the side which becomes the end face 1A of the laminate 1. , The other end is the other side of the pair of short sides of the insulator layer 1c,
For example, it extends to the side that becomes the end surface 1B of the laminated body 1.
In the state of the laminated body 1, one end thereof extends to the end face 1A on the short side of the laminated body 1 and is connected to the terminal electrode 2, and the other end thereof is the end face on the short side of the laminated body 1. It extends to 1B and is connected to the terminal electrode 3.

The shape of the ground side conductor pattern 7 will be described with reference to FIG. Note that FIG. 3B will be described by taking the ground side conductor pattern 7 formed on the insulating layer 1d as an example.

Since the ground side conductor pattern 7 is formed so as to face the signal side conductor pattern 6 shown in FIG. 3 (a) as a whole, it is a substantially similar pattern.
A portion different from the signal side conductor pattern 6 is such that one end of the ground side conductor pattern 7 extends to one side of a pair of long sides of the insulator layer 1d, for example, a side to be the end face 1C of the laminate 1, and the other ends However, it is in an open state near the short side 1B side of the laminated body 1. In addition, one end of the ground-side conductor pattern 7 is connected to the terminal electrode 4 on the end surface 1C of the multilayer body 1.

Here, what is important is that the signal side conductor pattern 6 and the ground side conductor pattern 7 are opposed to each other with the insulating layer body layer, for example, the insulating layer body layer 1c interposed therebetween in FIG. The signal-side conductor pattern 6 and the ground-side conductor pattern 7 are formed in a meandering state on the insulating layers 1c and 1d in order to make the conductor length a predetermined value, and moreover, in the extending direction of the meandering shape, that is, This means that the meandering amplitude direction is the longitudinal direction of the insulating layers 1c and 1d (direction of the end faces 1A-1B of the laminated body 1).

One end of the signal-side conductor pattern 6 extends as it is from the conductor pattern portion located closest to the end face 1D of the laminate 1, and the other end of the signal-side conductor pattern 6 extends. , The conductor pattern portion located closest to the end surface 1C of the laminated body 1 is directly extended.

Further, one end of the ground-side conductor pattern 7 is bent in the middle of the conductor pattern located closest to the end face 1C of the laminate 1. That is, that is, the bent portion extending portion 7a is formed in the middle of the conductor pattern.

Therefore, the insulator layer 1c is interposed between the signal side conductor pattern 6 and the ground side conductor pattern 7 shown in FIGS. 3 (a) and 3 (b), and substantially the ground side conductor. The patterns 7 face each other in an area determined by the conductor length and the conductor width.

That is, the signal-side conductor pattern 6 and the ground-side conductor pattern 7 generate inductor components corresponding to the respective conductor lengths, and at the same time, generate capacitance components corresponding to the facing areas.

The insulator layer 1 shown in FIGS. 3 (a) and 3 (b)
The signal-side conductor pattern 6 and the ground-side conductor pattern 7 other than between b and 1c and between the insulator layers 1c and 1d have the same pattern. Therefore, the plurality of signal side conductor patterns 6 are connected by the terminal electrodes 2 and 3, and the plurality of ground side conductor patterns 7 are connected by the terminal electrode 4, so that the respective inductor components and capacitance components are combined, The LC circuit shown in FIG. 4 is formed by the distributed constant coupling, whereby a noise filter having a predetermined characteristic is formed.

In the present invention, as shown in FIGS. 3A and 3B, the meandering direction of the signal side conductor pattern 6 and the ground side conductor pattern 7 is the longitudinal direction of the laminate 1 (end face 1A-
1B direction). On the other hand, conventionally, as shown in FIGS. 5A and 5B, the signal-side conductor pattern 60 and the ground-side conductor pattern 70 are formed on the rectangular insulating layer 10c and have a meandering amplitude. Insulator layer 1 in the direction
0c short side direction (end face 1C-1D in the laminated body of FIG. 1
Direction corresponding to the direction).

Therefore, as shown in FIG. 5B, in order to extend one end of the ground side conductor pattern 70 to the long side (10C) of the insulating film 10c, the signal side conductor pattern 6 is formed.
It is necessary to form the leading conductor film 71 from the end portion of the pattern facing 0 to the long side (10C) of the insulator film 10c, and only the area necessary for forming the leading conductor film 71 becomes the dead space. Will end up. That is, the region forming the meandering pattern is reduced by that amount, the conductor length is shortened, and the area facing the signal-side conductor pattern 60 is greatly reduced.

The inventor of the present invention has shown that FIG.
5B, the signal side conductor pattern 6, the ground side conductor pattern 7 shown in FIG. 5B, the signal side conductor pattern 60, the ground side conductor pattern 70, the conductor length, and the opposing of both conductor patterns. As a result of comparing the areas, FIG. 3 of the present invention is compared with the conventional case shown in FIGS.
It was confirmed that the signal-side conductor pattern 6 and the ground-side conductor pattern 7 shown in (a) and FIG. 3 (b) increased to about 133%, respectively.

That is, the predetermined conductor pattern length which is the same as the conventional one,
Given the value of the predetermined facing area, the planar shape of the laminate is
Conversely, it can be 87%.

In FIGS. 5A and 5B, the meandering amplitude of the conductor pattern is provided at the maximum with respect to the short side width of the insulator layer 10, and the end portion of the ground side conductor pattern 70 is provided. In order to eliminate the need for the lead-out conductor film 71, the ground-side conductor pattern 7 is provided in the middle of the ground-side conductor pattern 70.
Although it is conceivable to extend the end portion of 0 to the long side 1C side of the insulating layer 10, in order to extend to the long side 1C side of the insulating layer 10 in the middle of the ground side conductor pattern 70 extending in the longitudinal direction. , The dead length of the conductor length becomes longer than that in FIG.

As described above, according to the present invention, the meandering amplitude direction of the signal side conductor pattern 6 and the ground side conductor pattern 7 is made to be the same as the longitudinal direction of the laminate 1, and the laminate 1 of the ground side conductor pattern 77 is formed. The length of the conductor pattern is maximized because it directly extends from the middle of the conductor pattern closest to the long side (1C or 1D) to the end of the long side (1C or 1D) of the laminate 1. By doing so, the facing area can be made extremely wide, which allows the signal conductor pattern 6 and the ground conductor pattern 7 having the longest conductor length and the largest facing area even in the compact laminate 1. Can be formed.

In the above-mentioned embodiment, the three ground side conductor patterns 7 and the two signal side conductor patterns 6 are laminated, but the number of layers can be changed arbitrarily.

[0044]

As described above, the meandering amplitude direction of the first conductor pattern which is the signal side conductor pattern and the second conductor pattern which is the ground side conductor pattern is the same as the longitudinal direction of the laminate. And both ends of the first conductor pattern are directly extended to the end faces of the short sides of the laminate, and the ends of the second conductor pattern are laminated substantially without forming a leading conductor film. Since it is extended to the end face of the long side of the body, the formation area for forming the conventional lead-out conductor film is not required. Therefore, the conductor length of the first conductor pattern, the conductor length of the second conductor pattern, The area can be maximized.

Furthermore, the second conductor pattern faces the first conductor pattern in the entire conductor length, and the entire second conductor pattern serves as a distributed constant operation region, so that it is in a high frequency region as compared with the conventional case. It never deteriorates the attenuation pole at.

After all, it is possible to cope with miniaturization, and it is possible to achieve a noise fill that is characteristically satisfactory.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view of a laminated body portion of the filter of the present invention.

FIG. 3A is a plan view showing a first conductor pattern of the present invention, and FIG. 3B is a plan view showing a second conductor pattern of the present invention.

FIG. 4 is an equivalent circuit diagram of a filter.

FIG. 5A is a plan view showing a conventional first conductor pattern, and FIG. 5B is a plan view showing a conventional second conductor pattern.

[Explanation of symbols]

 1 ... Laminated bodies 1a to 1h ... Insulator layer 6, 60 ... First conductor pattern 7, 70 ... Second conductor pattern 71. Conductor film 2, 3 ... Signal side terminal electrode 4, 5 ... Ground side terminal electrode

Claims (1)

[Claims] 1. A rectangular parallelepiped laminated body formed by laminating a plurality of insulating layers, and arranged between the insulating layers of the laminated body, and an end portion extending to a pair of end faces of the laminated body. A meandering first conductor pattern; a meandering second conductor pattern which is disposed between the insulator layers of the laminate and whose ends extend to the other pair of end faces of the laminate; It is formed on a pair of end faces on the short side of the laminated body,
A pair of signal-side terminal electrodes connected to the ends of the conductor pattern and a ground-side terminal electrode formed on the end face on the long side of the laminate and connected to one end of the second conductor pattern, In a laminated noise filter in which the first conductor pattern and the second conductor pattern are opposed to each other with the insulator layer interposed therebetween, an amplitude direction of the meandering first and second conductor patterns is A multilayer noise filter having the same direction as the longitudinal direction of the laminate.