JP2000353619A - Inductor array - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inductor array which can be used even in case where one inductor array absorbs a plurality of levels of noise and has a high degree of freedom for use. SOLUTION: In a laminated inductor array provided with a plurality of laminated coils 5 (5a, 5b, 5c, and 5d) in one array element 1, at least a part (5a and 5c) of the coils 5 (5a, 5b, 5c, and 5d) are made to have impedance different from those of the other coils (5b and 5d), so that the inductor array may be used even when one inductor array absorbs a plurality of levels of noise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductor, and more particularly, to an inductor array in which a plurality of coils are arranged in one array element.

[0002]

2. Description of the Related Art FIG. 4 is a perspective view showing an external structure of a conventional laminated inductor array, FIG. 5 is a plan view, and FIG. 6 is an exploded perspective view showing a main part structure. .

As shown in FIGS. 4 to 6, this inductor array has four stacked coils 55 (55a, 55b, 55c, 55d) arranged in one array element 51. On both side surfaces of the array element 51, input / output external electrodes 56 (56a, 56) connected to the ends of the laminated coils 55 (55a, 55b, 55c, 55d).
b, 56c, 56d).

[0004] Each laminated coil 55 (55a, 55
b, 55c, 55d) are predetermined coil patterns 52
A plurality of ceramic green sheets 53 (53a, 53b, ...) on which (52a, 52b, ..., 52n) are printed.
53n) are laminated and pressure-bonded, and each coil pattern 52 is formed by conducting each other through a via hole 54, and each laminated coil 55 (55a, 55b, 55) is formed.
c, 55d) are configured to have the same impedance.

In the inductor array configured as described above, each laminated coil 55 (55a, 55b, 5
5c, 55d) have the same impedance, which is extremely effective in absorbing many noises of the same level at once.

However, each laminated coil 55 (55a, 5a)
5b, 55c, and 55d) have the same impedance, and cannot cope with a case where a plurality of noises having different levels are absorbed. Therefore, conventionally, a plurality of (single types) inductors having different impedances are used to absorb a plurality of noises having different levels.

However, when a plurality of single inductors are used, it is necessary to increase the ground portion, and high-density mounting is restricted. Therefore, the mounting area is larger than when an inductor array is used. There is a problem.

Further, when a plurality of (single types) inductors are used, the number of mounted components increases, which causes a problem that mounting cost is increased.

The present invention solves the above-mentioned problems, and provides an inductor array which can be used even when a plurality of noises having different levels are absorbed and has a high degree of freedom in application. Aim.

[0010]

In order to achieve the above object, an inductor array according to the present invention (claim 1) is an inductor array in which a plurality of coils are arranged in one array element. At least a part of the coils has an impedance different from that of the other coils.

[0011] By providing at least a part of the plurality of coils with impedance different from that of the other coils, a single inductor array can cope with a case where a plurality of noises having different levels are absorbed. Will be able to Therefore, high-density mounting can be performed, and mounting cost can be reduced.

Further, the inductor array of the present invention (claim 2) is formed by stacking a plurality of coil patterns via a ceramic layer in one array element and conducting each coil pattern to each other. In a laminated inductor array having a plurality of laminated coils, at least a part of the laminated coils is
It is characterized in that it has a different impedance from other laminated coils.

In a laminated inductor array having a plurality of laminated coils in one array element, at least a part of the laminated coils is provided with an impedance different from that of other laminated coils. In this case, a plurality of noises having different levels can be absorbed by one inductor array, so that high-density mounting can be performed and mounting cost can be reduced. .

Further, in the inductor array having a plurality of laminated coils, only those in which each laminated coil has the same impedance have been provided, but the invention of the present application (Claim 2) With this inductor array, it is possible to provide a multilayer inductor array that can cope with the case where a single inductor array absorbs multiple noises with different levels, and products using inductors High-density mounting,
This can contribute to downsizing.

According to a third aspect of the present invention, in the inductor array, at least a part of the multilayer coil is
At least one of (a) the number of laminated coil patterns, (b) the shape of the coil pattern, and (c) the distance between coil patterns adjacent to each other in the laminating direction via the ceramic layer is defined as another laminated coil. The feature is that the impedance is made different from that of the other laminated coils by making them different.

By changing the number of stacked coil patterns as shown in (a), it is possible to change the number of turns of the coil, and as shown in (b), the shape of the coil pattern is changed. By using two types of coil patterns that are different, for example, a 1/2 turn coil pattern and a 3/4 turn coil pattern, the number of turns can be made different, and for example, the coil pattern can be made similar and large. By making only a different pattern,
It is possible to make the diameter of the coil different, and further, as shown in (c) above, make the distance between the coil patterns adjacent to each other in the laminating direction via the ceramic layer different,
For example, the number of turns can be made different by forming a coil in which a coil pattern is provided for each ceramic layer and a coil in which the coil pattern is thinned out and another coil pattern is provided. Therefore, by adopting the above configurations (a) to (c), the impedance can be reliably made different from that of the other coils, and the present invention can be made more effective.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described, and features thereof will be described in more detail.

FIG. 1 is a perspective plan view schematically showing a configuration of an inductor array according to an embodiment of the present invention.
3 is an exploded perspective view showing a configuration of a main part, and FIG. 3 is a perspective view showing an external configuration.

As shown in FIGS. 1 to 3, this inductor array has four laminated coils 5 (5a, 5b, 5c, 5d) arranged in one array element 1. On both sides of the array element 1, each laminated coil 5
It has a structure in which input / output external electrodes 6 (6a, 6b, 6c, 6d) connected to the ends of (5a, 5b, 5c, 5d) are provided.

In the inductor array of this embodiment, the multilayer coils 5a and 5c have a larger number of turns and a larger impedance than the multilayer coils 5b and 5d (eg, the multilayer coils 5a and 5d). 5
c so that the impedance becomes 600Ω, and the multilayer coils 5b and 5d have an impedance of 30Ω).

This inductor array is, for example,
As shown in FIG. 2, a predetermined coil pattern 2L (2L
a, 2Lb,... 2Ln), 2S (2Sa, 2Sb,.
2Sn), a plurality of ceramic green sheets 3 (3a, 3b,..., 3n) printed thereon are laminated and pressure-bonded, and each coil pattern 2L, 2S is formed by conducting each other through a via hole 4. Laminated coil 5
The coil patterns 2L constituting the coils a and 5c are such that the number of turns of the laminated coils 5a and 5c is smaller than that of the laminated coils 5b and 5d.
So that the number of turns of the laminated coil 5
It is formed so as to be longer than that of the coil pattern 2S constituting b, 5d. However, the specific patterns of the coil patterns 2L and 2S in FIG. 2 are merely schematic, and as described above, the laminated coils 5a and 5c
Has an impedance of 600Ω, and the laminated coils 5b and 5d
Is not accurately designed to have an impedance of 30Ω.

As described above, in the inductor array of this embodiment, the multilayer coils 5a and 5c are configured so as to have a larger number of turns and a larger impedance than the multilayer coils 5b and 5d. For example, a signal line of a USB shielded cable (in which a signal line and a power supply line are housed as a pair), which is an interface for connecting a personal computer and its peripheral device, is connected to the laminated coils 5a and 5c. By connecting the power supply lines to the laminated coils 5b and 5d, it is possible to simultaneously absorb the noise of the signal lines having different levels and the noise of the power supply lines with one inductor array, and thereby realize a high-density product. It can contribute to mounting and miniaturization.

In the above embodiment, the laminated coil 5
The case where the number of turns of the laminated coils 5a and 5c is increased by making the coil pattern 2L constituting the laminated coils 5b and 5d different from the coil pattern 2S constituting the laminated coils 5b and 5d will be described. However, for example, the coil pattern 2L constituting the laminated coils 5a and 5c and the coil pattern 2S constituting the laminated coils 5b and 5d are made the same pattern,
a, 5c, the number of laminated coil patterns 2L
Coil pattern 2S constituting laminated coils 5b and 5d
Or the laminated coils 5b, 5d
Is increased by increasing the distance (distance in the stacking direction) between the coil patterns 2S adjacent to each other via the ceramic layer (for example, by omitting the coil patterns 2S and disposing them every other layer).
The number of turns of the laminated coils 5a and 5c and the number of turns of the laminated coils 5b and 5d may be made different from each other so that each has a desired impedance.

It is also possible to adjust the characteristics of the coil by changing not only the number of turns but also the diameter of the coil and the width of the coil pattern constituting the coil. Further, in the above embodiment, the case where each coil constituting the inductor array is a laminated coil has been described.However, the present invention is applicable to the case where the coil constituting the inductor array is formed of a metal wire or a metal plate. The present invention can also be applied to an inductor array using a coil that is not a stacked type, and in that case, a similar effect can be obtained.

In the above-described embodiment, the case where four coils are provided in one array element has been described. However, the present invention has no particular limitation on the number of coils, and the number of coils is four. It is also possible to apply to less than five or more than five inductor arrays.

Further, in the above embodiment, an inductor array having two types of two coils having different impedances has been described as an example. However, an inductor array having three or more types of coils having different impedances is configured. It is also possible.

The present invention is not limited to the above embodiment in other respects, and various applications and modifications can be made within the scope of the invention.

[0028]

As described above, in the inductor array according to the present invention (claim 1), at least some of the plurality of coils have different impedances from the other coils, so that the levels of the coils differ. One inductor array can cope with a case where a plurality of noises are absorbed. Therefore, high-density mounting can be performed, and mounting cost can be reduced.

Further, according to the inductor array of the present invention (claim 2), in a laminated inductor array having a plurality of laminated coils in one array element, at least a part of the laminated coils is provided. However, even when the impedance is different from that of other laminated coils, multiple noises with different levels can be absorbed by one inductor array, enabling high-density mounting. In addition, the mounting cost can be reduced.

Further, in the inductor array having a plurality of laminated coils, only one in which each laminated coil has the same impedance has been provided, but the invention of the present application (Claim 2) With this inductor array, it is possible to provide a multilayer inductor array that can cope with the case where a single inductor array absorbs multiple noises with different levels, and products using inductors High-density mounting,
This can contribute to downsizing.

Further, as in the inductor array according to the third aspect, (a) the number of stacked coil patterns, (b) the shape of the coil pattern, and (c) the distance between the coil patterns adjacent to each other via the ceramic layer. By making at least one of the different from the other laminated coil, it is possible to reliably make the impedance different from other coils,
The present invention can be made more effective.

[Brief description of the drawings]

FIG. 1 is a plan perspective view schematically showing a configuration of an inductor array according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a main part configuration of an inductor array according to one embodiment of the present invention.

FIG. 3 is a perspective view showing an external configuration of an inductor array according to an embodiment of the present invention.

FIG. 4 is a perspective view showing an external configuration of a conventional laminated inductor array.

FIG. 5 is a plan view showing a conventional laminated inductor array.

FIG. 6 is an exploded perspective view showing a configuration of a main part of a conventional laminated inductor array.

[Explanation of symbols]

1 Array element 2L (2La, 2Lb, ... 2Ln) Coil pattern 2S (2Sa, 2Sb, ... 2Sn) Coil pattern 3 (3a, 3b, ... 3n) Ceramic green sheet 4 Via hole 5 (5a, 5b, 5c, 5d) Laminated coil 6 (6a, 6b, 6c, 6d) External electrode

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Yukio Sakamoto 2-26-10 Tenjin, Nagaokakyo-shi, Kyoto Inside Murata Manufacturing Co., Ltd. F-term in Murata Manufacturing (reference) 5E070 AA01 AA05 AA20 AB03 AB10 CB13 CB17 EA01 5J024 AA01 BA18 DA21 DA29 DA34 DA35 EA09

Claims (3)

[Claims] 1. An inductor array comprising a plurality of coils arranged in one array element, wherein at least a part of the coils has a different impedance from other coils. Characteristic inductor array. 2. A laminated type comprising a plurality of coil patterns formed by laminating a plurality of coil patterns via a ceramic layer in one array element and making the coil patterns conductive with each other. In the inductor array, at least a part of the multilayer coil has an impedance different from that of another multilayer coil. 3. At least a part of the laminated coils is (a) the number of laminated coil patterns, (b) the shape of the coil pattern, and (c) adjacent to each other in the laminating direction via a ceramic layer. 3. The inductor array according to claim 2, wherein at least one of the distances of the coil pattern is different from that of the other laminated coils to have an impedance different from that of the other laminated coils.