JPH082972Y2 - Multilayer inductor array - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multilayer inductor array used for removing noise caused by electrical or magnetic interference, that is, EMI noise, and particularly magnetic induction occurs between coil conductors even if the lead pitch is narrowed. The present invention relates to a laminated inductor array characterized by being difficult.

[0002]

2. Description of the Related Art Hitherto, a laminated inductor array has been known as one of composite electronic components. Usually, in this laminated inductor array, a coil 6 having a spiral shape in a rectangular shape is provided inside a ferrite base material 1.
Of the laminated chip inductor (FIGS. 7 and 8) in which the end portion of the coil and the external terminal electrode 5 formed on the leading end surface of the coil end portion are connected (FIGS. 7 and 8) and integrated (FIG. 2). . Further, the coils 6 in the laminated inductor array have a constant pitch between adjacent coils, and this pitch and the pitch of the external electrode terminals 5, that is, the lead pitch, correspond to each other (FIG. 9). . Such a laminated inductor array has been mainly used as a noise countermeasure for electronic devices.

In the laminated inductor array as described above, an internal conductor pattern is generally formed on a green sheet by stacking and connecting through holes to form a spiral coil, and the sheets are laminated and pressure-bonded in a predetermined configuration. Then, after firing, the external terminal electrode 5 is formed on the leading end surface of the coil end portion.
Has been manufactured by forming a.

[0004]

In recent years, with the miniaturization of electronic equipment, the wiring pitch of a circuit board has become narrower, and a laminated inductor array having a narrow lead pitch has been demanded. However, according to the conventional multilayer inductor array, if the lead pitch is narrowed in accordance with the wiring pitch, the gap between the coils arranged in parallel in a plurality becomes narrow, and adjacent coils interfere with each other to cause magnetic induction. ,
This has become a so-called crosstalk phenomenon in which noise is generated as an electrical signal. When the crosstalk phenomenon occurs, it deteriorates the magnetic characteristics of the composite electronic component and causes malfunction of the electronic device. Therefore, it is desirable to minimize crosstalk,
So far, no effective method has been developed.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above-mentioned problems of the prior art and to provide a composite electronic component in which the magnetic characteristics do not deteriorate even if the lead pitch is narrowed.

[0006]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the inventors of the present invention have arranged a plurality of coils, which are wound in a triangular shape inside a ferrite magnetic material, in orderly arranged in two rows. It has been found that the above problems can be solved by alternately arranging the vertices of triangles in opposite directions and arranging them in a zigzag shape, and the present invention can be provided.

That is, according to the present invention, a plurality of spirally-wound conductor coils are arranged inside a plate-shaped substrate at a constant pitch, and each coil is connected to an external terminal electrode. In the multilayer inductor array , the coil conductor is spirally wound so that a cross section orthogonal to the coil axis is a triangle, and adjacent coils have corresponding vertices of their cross section triangles facing opposite directions, and It is intended to provide a laminated inductor array characterized in that opposite sides are arranged in parallel.

[0008]

In the laminated inductor array of the present invention, a plurality of spiral coil conductors, which are wound in a triangular shape inside the ferrite body, are alternately shifted little by little in the width direction of the body.
The triangles are arranged in a zigzag pattern so that their vertices are alternately opposite. By arranging the coil conductors in the ferrite body in such a form, even if the lead pitch is the same as that of the conventional composite electronic component in which coil conductors that circulate in a rectangular shape are arranged in parallel and arranged, Magnetic induction between coil conductors is less likely to occur. Therefore, crosstalk between coil conductors is reduced, and deterioration of magnetic characteristics is prevented.

Hereinafter, the present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited by the following embodiments.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A laminated inductor array of the present invention will be described below with reference to FIGS. 1 and 3 to 6. FIG. 1 is a perspective view from the top of the laminated inductor array manufactured in this example, and FIG. 3 is a diagram showing a green sheet on which internal electrode patterns forming the laminated inductor array are formed. FIGS. 4 to 6 are views showing the manufacturing process of the laminated inductor array step by step. FIG. 4 is a perspective view showing a laminated manner of various green sheets forming the inductor array, and FIG. FIG. 6 is a perspective view showing an inductor array body obtained by stacking and pressure-bonding green sheets, and FIG. 6 is a perspective view showing a mode in which external terminal electrodes are formed on the body of FIG.

In this example, the laminated inductor array was manufactured as follows. First, Fe ₂ O ₃ is 46 mol%,
29 mol% ZnO, 13 mol% NiO, 10 mol CuO
% And MnO of 2 mol% were used to prepare a green sheet 4 having a thickness of 100 μm by the doctor blade method. Next green sheet 4
The through hole 3 is opened at a predetermined position of, and a conductive paste for internal electrodes, which contains silver as a main component, is used on this sheet.
The internal conductor pattern 2 shown in (a) to (e) was printed.

Next, these green sheets were laminated in the manner as shown in FIG. That is, the internal conductor pattern 2
And five green sheets 4 on which the through holes 3 are not formed are stacked, and the green sheets 4 shown in FIGS.
(B), (d), (c), (b) and (a) are sequentially laminated and through-hole connected, and finally six green sheets 4 in which the internal conductor pattern 2 and the through-hole 3 are not formed are laminated. did. After the lamination, the obtained laminated body was pressure-bonded (FIG. 5) and baked at 900 ° C. for 2 hours. Next, a line-shaped external terminal electrode 5 is applied to the end surface of the obtained sintered body from which the end portion of the internal conductor pattern is led out, using a conductive paste for external terminal electrodes containing silver as a main component (FIG. 6). ),
After baking at 700 ° C, N is applied to these external terminal electrodes 5.
After performing i plating and Sn plating, a spiral inductor coiled in a triangular shape as shown in FIG. 1 was provided in the ferrite substrate 1 to obtain a laminated inductor array.

When the crosstalk between the adjacent internal conductor patterns was measured using the laminated inductor array manufactured as described above, it was as low as -26 dB, and magnetic induction did not occur between the adjacent coils.

[0014]

[Comparative example] For comparison with the inductor array of the present invention,
A conventional inductor array was manufactured in the same manner as in the example except that the coil having the shape shown in FIG. 2 was internally provided, and the crosstalk between adjacent internal conductor patterns was measured and found to be −16 dB. There was magnetic induction.

[0015]

The laminated inductor array of the present invention is less likely to cause magnetic induction between coil conductors when the lead pitch is narrowed as compared with the conventional product. Therefore, crosstalk between coil conductors is reduced, deterioration of magnetic characteristics is prevented, and an inductor array having a narrow lead pitch can be provided.

[Brief description of drawings]

FIG. 1 is a perspective plan view from above of a laminated inductor array of the present invention.

FIG. 2 is a perspective plan view from the upper surface of a conventional laminated inductor array.

FIG. 3 is a plan view showing a green sheet on which an internal conductor pattern forming the laminated inductor array of FIG. 1 is formed.

FIG. 4 is a diagram showing a step-by-step manufacturing process of the laminated inductor array of FIG. 1, and is a perspective view showing a laminated manner of various green sheets.

5 is a perspective view showing an inductor array element body obtained by stacking and pressure-bonding various green sheets of FIG. 4. FIG.

6 is a perspective view showing a mode in which external terminal electrodes are formed on the element body of FIG.

FIG. 7 is a perspective view showing a laminated chip inductor in which one spiral coil that circulates in a rectangular shape is provided inside a ferrite body.

FIG. 8 is a schematic view of the multilayer chip inductor of FIG.

FIG. 9 is a schematic diagram of a laminated inductor array.

[Explanation of symbols]

 1 ... Ferrite base 2 ... Inner conductor pattern 3 ... Through hole 4 ... Green sheet 5 ... External terminal electrode 6 ... Coil

Claims (1)

[Scope of utility model registration request] 1. A laminated inductor array in which a plurality of spirally wound conductor coils are arranged inside a plate-shaped substrate at a constant pitch, and each coil is connected to an external terminal electrode. So, the coil conductor is
The coils are spirally wound so that the cross section orthogonal to the coil axis becomes a triangle, and adjacent coils are arranged in such a manner that corresponding vertices of the cross section triangles face in opposite directions and opposite sides are parallel to each other. Laminated inder characterized by
Kuta array .