JP3554775B2 - Laminated coil parts - Google Patents

Description

【００１９】
【発明の効果】
以上の説明から明らかなように、本発明によれば、コイル用導体の間に配設された非磁性の絶縁性層のうち所定の絶縁性層の厚みを変えることにより、コイル用導体の間隔を部分的に異ならせ、それに応じてインダクタンス値を変化させるようにしたので、特性を低下させることなく、インダクタンス値の微調整を行うことができ、狭偏差のインダクタンス値を有する、特性の優れた積層型コイル部品を得ることができる。さらに、本発明によれば、コイル用導体のパターン形状の種類を増やす必要がないので、積層型コイル部品の製造コストも引き下げることができる。
【図面の簡単な説明】
【図１】本発明に係る積層型コイル部品の一実施形態を示す分解斜視図。
【図２】図１に示されている積層型コイル部品の外観斜視図。
【図３】従来の積層型コイル部品の分解斜視図。
【図４】図３に示されている積層型コイル部品の外観斜視図。
【符号の説明】
１１…積層型コイル部品
１２ａ〜１２ｉ…コイル用導体
１３…絶縁性グリーンシート
Ｔ，ｔ…厚み[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a laminated coil component, particularly to a laminated coil component used for a high-frequency electronic circuit or the like.
[0002]
[Prior art]
An example of this type of laminated coil component is shown in FIGS. The laminated coil component 1 as it has a chip shape, the insulating green sheet 3 provided on the surface of the conductor 2 ₁ to 2 _n coil respectively, by disposing the respective protective green sheet 3 at the upper side and the lower side They are laminated and fired. Conductor 2 ₁ to 2 _n for each coil, a via hole ₆₁ provided in the insulating green sheet _3, 6 2, _{6 3,} are electrically connected in series via _..., form one spiral coil are doing.
[0003]
Coil conductors 2 ₁ is electrically connected to the lead electrode 4a provided exposed on the left side of the green sheet 3. The extraction electrode 4a is connected to a terminal electrode 7 provided at the left end of the multilayer coil component 1. The coil conductor _2n is electrically connected to a lead electrode 4b exposed on the right side of the green sheet 3. The extraction electrode 4b is connected to a terminal electrode 8 provided at the right end of the multilayer coil component 1.
[0004]
By the way, in the laminated coil component 1 having such a configuration, in order to obtain a different inductance value without changing the external dimensions, the material composition of the insulating green sheet 3 is changed to change the magnetic permeability, changing the number of turns of the coil formed by the use conductor 2 ₁ to 2 _n, or by changing the diameter of the coil formed by the coil conductor 2 ₁ to 2 _n, it had gained the necessary inductance value.
[0005]
Further, in the case of manufacturing a product having a so-called narrow deviation in which the deviation of the inductance value is, for example, ± 2% to ± 5%, in addition to the above-described method, the following methods (1) to (3) are used. Thereby, the inductance value falls within a desired deviation.
(1) changing the size of a given coil conductors of the coil conductors 2 ₁ to 2 _n, to change a portion of the diameter of the coil.
(2) changing the pattern width of the predetermined coil conductors of the coil conductors 2 ₁ to 2 _n.
(3) shifting the position of a given conductive coil of the coil conductors 2 ₁ to 2 _n, block the part of the magnetic flux passing through the coil component 1 in the predetermined coil conductors.
[0006]
[Problems to be solved by the invention]
However, in the conventional laminated coil component 1, if the size of the predetermined coil conductor is changed as in (1) or the pattern width of the predetermined coil conductor is changed as in (2), the coil is use conductor 2 ₁ to 2 _n kinds of increases, there is a problem that manufacturing cost becomes high. Further, if the position of the predetermined coil conductor is shifted and a part of the magnetic flux passing through the coil component 1 is blocked by the predetermined coil conductor as in (3), the frequency characteristics of the coil component 1, particularly , There is a problem that the Q characteristic is deteriorated.
[0007]
Therefore, an object of the present invention is to provide a laminated coil component that can realize an inductance value with a narrow deviation at low cost and has excellent characteristics.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a laminated coil component according to the present invention has a structure in which at least one of the non-magnetic insulating layers disposed between the coil conductors has at least one remaining non-magnetic insulating layer disposed between the coil conductors. Characterized by having a thickness different from the thickness of the nonmagnetic insulating layer.
The nonmagnetic insulating layers having different thicknesses may be one layer. Alternatively, the plurality of overlapping layers may have the same thickness, and the thickness of each of the plurality of overlapping layers may be different from the thickness of the remaining nonmagnetic insulating layer.
[0009]
[Action]
By changing the thickness of the predetermined insulating layer of the non-magnetic insulating layer disposed between the coil conductors, the interval between the coil conductors is partially different, and the inductance of the laminated coil component is accordingly changed. The value changes.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a laminated coil component according to the present invention will be described with reference to the accompanying drawings.
[0011]
As shown in FIGS. 1 and 2, the laminated coil component 11 includes a rectangular insulating green sheet 13 provided with coil conductors 12 a to 12 i on the surface, and a protective insulating green sheet on the upper and lower sides, respectively. The sheet 13 is arranged, laminated, and fired. The coil conductors 12a to 12i are electrically connected in series via via holes 16a to 16h provided in the green sheet 13, respectively, to form a spiral coil. The insulating green sheet 13 is made of a dielectric material such as ceramic. The coil conductors 12a to 12i are formed by, for example, applying a conductive paste to the surface of the insulating green sheet 13 by a method such as printing and drying. As the conductive paste, one obtained by kneading metal powder of Ag, Pd, Ni, Cu or an alloy thereof with a binder and a solvent is used.
[0012]
The coil conductor 12a is electrically connected to an extraction electrode 14a that is exposed on the left side of the green sheet 13. The extraction electrode 14a is connected to a terminal electrode 17 provided at the left end of the multilayer coil component 11. The coil conductor 12i is electrically connected to a lead electrode 14b that is exposed on the right side of the green sheet 13. The extraction electrode 14 b is connected to a terminal electrode 18 provided at the right end of the multilayer coil component 11.
[0013]
In the present embodiment, the thickness t of the green sheet 13 provided with the coil conductors 12d and 12e on the surface is made smaller than the thickness T of the green sheet 13 provided with the coil conductors 12a to 12c and 12f to 12i. ing. Due to the thin green sheet 13, the interval between the coil conductors 12d to 12f in the laminating direction is reduced. Accordingly, the intervals in the stacking direction of the coil conductors 12a to 12i constituting the spiral coil are partially different, and the inductance value of the multilayer coil component 11 slightly changes accordingly. In this manner, by varying the thickness of the insulating green sheet 13 provided between the coil conductors 12a to 12i, the inductance value can be made to fall within a necessary deviation range.
[0014]
Further, simply reducing the thickness of the green sheet 13 provided with the coil conductors 12d and 12e on the surface changes the outer dimensions of the coil component 11, and in some cases, increases the thickness of the protective green sheet 13 by that amount. Thus, the outer dimensions of the coil component 11 may not be changed.
[0015]
The present invention is not limited to the above embodiment, and can be variously modified within the scope of the gist.
The thickness of the insulating layer disposed between the coil conductors may be such that at least one predetermined insulating layer is different from the thickness of the other insulating layers. May be thicker than the thickness of the insulating layer. Furthermore, the arrangement position of the insulating layer having a thickness different from the thickness of the other insulating layers does not necessarily need to be arranged at the center of the coil component in the stacking direction as in the above embodiment, and is arbitrary, for example, It may be arranged at the upper part or the lower part in the laminating direction.
[0016]
In the above-described embodiment, the insulating green sheets on which the coil conductors are formed are stacked and then integrally fired, but the invention is not necessarily limited to this. As the insulating sheet, a sheet sintered in advance may be used. Further, the coil component may be manufactured by a manufacturing method described below. After a paste-like insulating material is applied by printing or the like to form an insulating layer, a paste-like conductor material is applied to the surface of the insulating layer to form a coil conductor. Next, a paste-like insulating material is applied from above the coil conductor to form an insulating layer. In this way, a coil component having a laminated structure is obtained by successively coating. At this time, when forming an insulating layer having a thickness different from other insulating layers, for example, in the case of printing, change the viscosity of the insulating material, or change the thickness or size of the screen plate mesh. Change the coating thickness by slipping.
[0017]
【Example】
Table 1 shows the results of tests performed by the present inventors. As a sample for this test, the outer dimensions of the coil component were 1.6 mm x 0.8 mm x 0.8 mm, the inner diameter of the spiral coil was 0.239 mm, the number of turns was 4.5 turns, and the coil was placed between coil conductors. As a green sheet to be provided, one using only a green sheet having a thickness of 50 μm (Example 1), one using a green sheet having a thickness of 30 μm, and the other using a green sheet having a thickness of 50 μm (Example 2) A green sheet (Example 3) using two green sheets each having a thickness of 30 μm and the other green sheets each having a thickness of 50 μm was manufactured. For comparison, the other conditions were the same, using only a green sheet having a thickness of 30 μm (Comparative Example 1), using only a green sheet having a thickness of 50 μm, and increasing the size of one coil conductor. A spiral coil having a partially increased inner diameter of 0.257 mm (Comparative Example 2) was manufactured. As a material for the green sheet, a low dielectric constant ceramic material was used. Using these samples, the inductance L and Q value at a frequency of 800 MHz were measured. Table 1 shows that the inductance L can be fine-tuned by changing the thickness of the predetermined green sheet without lowering the Q value.
[0018]
[Table 1]

[0019]
【The invention's effect】
As is apparent from the above description, according to the present invention, the distance between the coil conductors is changed by changing the thickness of a predetermined insulating layer among the nonmagnetic insulating layers disposed between the coil conductors. Are partially varied, and the inductance value is changed accordingly.Thus, it is possible to fine-tune the inductance value without deteriorating the characteristics, and to have an inductance value with a narrow deviation, and excellent characteristics. A laminated coil component can be obtained. Further, according to the present invention, it is not necessary to increase the number of types of pattern shapes of the coil conductor, so that the manufacturing cost of the laminated coil component can be reduced.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing one embodiment of a laminated coil component according to the present invention.
FIG. 2 is an external perspective view of the multilayer coil component shown in FIG.
FIG. 3 is an exploded perspective view of a conventional laminated coil component.
FIG. 4 is an external perspective view of the multilayer coil component shown in FIG. 3;
[Explanation of symbols]
11 laminated coil parts 12a to 12i coil conductor 13 insulating green sheet T, t thickness

Claims (3)

Stacking a plurality of insulating layers of conductor and non-magnetic coils, in the laminated coil component having a built-in coil is formed by connecting the conductor said coil in series,
At least one of the non-magnetic insulating layers disposed between the coil conductors has a thickness different from the thickness of the remaining non-magnetic insulating layer disposed between the coil conductors. A laminated coil component. In a laminated coil component incorporating a coil formed by laminating a plurality of coil conductors and a non-magnetic insulating layer and connecting the coil conductors in series,
Among the nonmagnetic insulating layers disposed between the coil conductors, the thickness of one layer is different from the thickness of the remaining nonmagnetic insulating layer disposed between the coil conductors. A laminated coil component having a thickness. In a laminated coil component incorporating a coil formed by laminating a plurality of coil conductors and a non-magnetic insulating layer and connecting the coil conductors in series,
Of the non-magnetic insulating layers disposed between the coil conductors, a plurality of overlapping layers have the same thickness, and the thickness of each of the plurality of overlapping layers is determined between the coil conductors. A laminated coil component having a thickness different from the thickness of the remaining nonmagnetic insulating layer provided.

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