JPH10270249A - Laminated type coil part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated type coil part of superior characteristics in which an inductance value of narrow deviation is realized with low cost. SOLUTION: Insulating green sheets 13, provided with conductors for coil 12a-12i on its surface respectively, are laminated and baked, while disposing protective green sheets 13 on the upper and lower sides, respectively. The conductors for coils 12a-12i are electrically connected in series through via holes 16a-16h which are formed on the green sheets 13, respectively, to constitute a spiral-like coil. A thickness (t) of the green sheets 13 with the conductors for coil 12d and 12e provided on the surface thereof is different from a thickness T of the green sheets 13 with conductors for coil 12a-12c and 12f-12i provided on the surface thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a laminated coil component, and more particularly to a laminated coil component used for high-frequency electronic circuits and the like.

[0002]

2. Description of the Related Art An example of this type of laminated coil component is shown in FIG.
And FIG. 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, series are electrically connected via a ... to form a single spiral coils.

[0003] conductor 2 ₁ coil 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 2 _n is electrically connected to an extraction electrode 4 b 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.
It is connected to the.

In order to obtain a different inductance value without changing the external dimensions of the laminated coil component 1 having such a configuration, the material composition of the insulating green sheet 3 is changed to change the magnetic permeability. Or
Changing the number of turns of the coil formed by the conductors 2 ₁ to 2 _n coil, 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 .

Further, in the case of manufacturing a product having a so-called narrow deviation in inductance value deviation, for example, ± 2% to ± 5%, in addition to the above-mentioned measures, the following (1) to (3) By such a method, the inductance value is made to fall 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]

However, in the conventional laminated coil component 1, the size of the predetermined coil conductor is changed as described in (1), or the predetermined coil conductor is changed as described in (2). changing the pattern width, the conductor 2 ₁ to 2 _n kinds of increases coils, there is a problem that manufacturing cost becomes high. Further, when 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 the above (3), the frequency characteristics of the coil component 1, especially And the Q characteristic is degraded.

An object of the present invention is to provide a laminated coil component which can realize an inductance value with a narrow deviation at low cost and has excellent characteristics.

[0008]

In order to achieve the above object, a laminated coil component according to the present invention is characterized in that at least one of the insulating layers disposed between the coil conductors is provided between the coil conductors. Has a thickness different from the thickness of the remaining insulating layer disposed on the substrate.

[0009]

By changing the thickness of a predetermined insulating layer among the insulating layers 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]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a laminated coil component according to the present invention will be described below with reference to the accompanying drawings.

As shown in FIGS. 1 and 2, the laminated coil component 11 has a rectangular insulated green sheet 13 having coil conductors 12a to 12i provided on the surface, respectively. The insulating green sheets 13 are 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 magnetic material such as ferrite or 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, A
A mixture of metal powders of g, Pd, Ni, Cu or their alloys kneaded with a binder and a solvent is used.

The conductor 12a for the coil is formed of the green sheet 1
3 is electrically connected to the extraction electrode 14a exposed on the left side. 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
Are electrically connected to an extraction electrode 14b exposed on the right side of the green sheet 13. The extraction electrode 14b is connected to a terminal electrode 18 provided at the right end of the multilayer coil component 11.

In the present embodiment, the coil conductor 1 is used.
The thickness t of the green sheet 13 provided with 2d and 12e on the surface is smaller than the thickness T of the green sheet 13 provided with the coil conductors 12a to 12c and 12f to 12i. Due to the thin green sheet 13, the interval between the coil conductors 12d to 12f in the laminating direction is reduced. Therefore, the coil conductors 12 forming the spiral coil
The intervals in the stacking direction of a to 12i are partially different, and the inductance value of the multilayer coil component 11 slightly changes accordingly. Thus, the coil conductors 12a to 12
By varying the thickness of the insulating green sheet 13 disposed between i, the inductance value can be made to fall within a necessary deviation range.

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, the thickness of the protective green sheet 13 may be changed. May be increased by that amount so that the external dimensions of the coil component 11 do not change.

The present invention is not limited to the above embodiment, but can be variously modified within the scope of the invention. The thickness of the insulating layer disposed between the coil conductors is sufficient if 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. further,
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 laminating direction as in the embodiment, and is arbitrary.
For example, it may be arranged at the upper part or the lower part in the laminating direction.

In the above 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 can be 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 and size of the screen plate mesh. Change the coating thickness by slipping.

[0017]

EXAMPLES 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 × 0.8 mm × 0.8 mm, spiral coil inner diameter is 0.239 mm, number of turns is 4.5 turns, and only green sheet having a thickness of 50 μm is provided between the coil conductors. (Example 1), one green sheet having a thickness of 30 μm, and others using a 50 μm green sheet (Example 2), two green sheets having a thickness of 30 μm, and others Using a 50 μm green sheet (Example 3)
Was made. For comparison, the other conditions were the same and the thickness was 3
Only the green sheet of 0 μm was used (Comparative Example 1), only the green sheet having a thickness of 50 μm was used, the size of one coil conductor was increased, and the inner diameter of the spiral coil was increased to 0.257 mm only in part. (Comparative Example 2) was produced. As the material of 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 finely adjusted by changing the thickness of the predetermined green sheet without reducing the Q value.

[0018]

[Table 1]

[0019]

As is apparent from the above description, according to the present invention, by changing the thickness of a predetermined insulating layer among the insulating layers disposed between the coil conductors, The distance between the points is partially changed, and the inductance value is changed accordingly.Thus, the inductance value can be finely adjusted without deteriorating the characteristic, and the characteristic value having a narrow deviation inductance value can be obtained. An excellent laminated coil component can be obtained. Further, according to the present invention, it is not necessary to increase the 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 conductors 13: insulating green sheets T, t: thickness

Claims (1)

[Claims] 1. A laminated coil component having a built-in coil formed by laminating a plurality of coil conductors and an insulating layer and connecting the coil conductors in series, wherein the laminated coil component is disposed between the coil conductors. Wherein at least one of the insulating layers has a thickness different from the thickness of the remaining insulating layers disposed between the coil conductors.