JPH0521409U - Composite electronic components - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide composite electronic components whose magnetic characteristics do not deteriorate even if the lead pitch is narrowed. [Structure] First, Fe ₂ O ₃ , ZnO, NiO, CuO
Using a ferrite material composed of MnO and MnO, a green sheet having a thickness of 100 μm is manufactured by the doctor blade method. Next, a through hole is formed at a predetermined position of the produced green sheet, and a conductive coil containing silver as a main component is used on this sheet to form a spiral coil that circulates in a triangle when stacked and connected to the through hole. The conductor pattern 2 is printed. Next, these green sheets are laminated in a predetermined order, press-bonded, and fired at 900 ° C. for 2 hours. Next, a line-shaped external terminal electrode is applied to the end surface of the obtained sintered body from which the end portion of the internal electrode pattern 2 is led out using a conductive paste containing silver as a main component,
After baking at 00 ° C., Ni plating and Sn plating are applied.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a composite electronic component used for removing noise caused by electrical or magnetic interference, that is, EMI noise, and is characterized in that magnetic induction hardly occurs between coil conductors even when the lead pitch is narrowed. Multilayer inductor array.

[0002]

[Prior Art]

 Conventionally, a laminated inductor array has been known as one of composite electronic components. Usually, this laminated inductor array has a coiled coil 6 in a rectangular shape inside a ferrite body 1, and external terminal electrodes formed at the end of the coil 6 and the end of the coil. A plurality of layered chip inductors connected to each other (FIGS. 7 and 8) are assembled and integrated (FIG. 2). The coils 6 in the laminated inductor array have a constant pitch between adjacent coils, and this pitch corresponds to the pitch of the external electrode terminals 5, that is, the lead pitch (FIG. 9). . Such a laminated inductor array has been mainly used as a countermeasure against noise in 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 sheet is laminated in a predetermined configuration. It has been manufactured by forming the external terminal electrode 5 on the leading end surface of the coil end portion after pressure bonding and firing.

[0004]

[Problems to be solved by the device]

 In recent years, with the miniaturization of electronic devices, the wiring pitch of a circuit board has become narrower, and a multilayer 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 side by side in parallel becomes narrow, and adjacent coils interfere with each other to cause magnetic induction. However, the so-called crosstalk phenomenon was generated in which this became an electrical signal and generated noise. If the crosstalk phenomenon occurs, it may deteriorate the magnetic characteristics of the composite electronic component and cause malfunction of the electronic device. Therefore, it is desirable to reduce crosstalk as much as possible, but no effective method has been developed so far.

Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technique 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 earnest studies for achieving the above-mentioned object, the present inventors have arranged a plurality of coils, which are wound in a triangular shape inside a ferrite magnetic material, in two rows in an orderly manner, and make the vertices of the triangles alternate in opposite directions. It has been found that the above problems can be solved by arranging them in a zigzag pattern 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 ferrite base material at a constant pitch in orderly arranged in two rows in the length direction of the base material. A composite electronic component in which each coil is connected to a plurality of line-shaped external terminal electrodes that are arranged and formed in parallel with the coil conductor terminal end lead-out surface at a pitch corresponding to the above-mentioned pitch, wherein the coil conductor is The spiral winding is such that the cross section orthogonal to the coil axis becomes a triangle, and adjacent coils are zigzag in such a manner that the corresponding vertices of their cross section triangles face in opposite directions and the opposite sides are parallel. The present invention provides a composite electronic component, which is characterized in that it is arranged in a pattern.

[0008]

[Action]

 In the composite electronic component of the present invention, a plurality of spiral coil conductors that are wound in a triangular shape inside a ferrite body are alternately shifted little by little in the width direction of the body, and the vertices of the triangles are alternately reversed. Are arranged in a zigzag pattern. By arranging the coil conductors in the ferrite base material in this manner, even if the lead pitch is the same as that of the conventional composite electronic component in which the coil conductors that circulate in a rectangular shape are arranged in parallel and installed, Magnetic induction between adjacent 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]

【Example】

 A laminated inductor array, which is an example of the composite electronic component of the present invention, will be described below with reference to FIGS. 1, 3 and 6. FIG. 1 is a perspective view from the top of the laminated inductor array manufactured in this embodiment, and FIG. 3 is a diagram showing a green sheet on which internal electrode patterns forming a laminated inductor array are formed. 4 to 6 are views showing the steps of manufacturing the above-mentioned laminated inductor array step by step. FIG. 4 is a perspective view showing a laminating mode of various green sheets forming the inductor array, and FIG. FIG. 6 is a perspective view showing an inductor array element 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 element body of FIG.

In this example, the laminated inductor array was manufactured as follows. First, Fe ₂ O₃Of the ferrite sheet consisting of 46 mol% of ZnO, 29 mol% of ZnO, 13 mol% of NiO, 10 mol% of CuO and 2 mol% of MnO. It was made. Next, through holes 3 are opened at predetermined positions of the produced green sheet 4, and a conductive paste for an internal electrode containing silver as a main component is used on this sheet to form an internal conductor pattern 2 shown in FIGS. 3 (a) to 3 (e). Printed.

Next, these green sheets were laminated in a manner as shown in FIG. That is, five green sheets 4 on which the internal conductor patterns 2 and the through holes 3 are not formed are stacked, and the green sheets 4 are stacked on the green sheets 4 as shown in FIGS. b) and (a) were sequentially laminated and through-hole connected, and finally six green sheets 4 in which the internal conductor pattern 2 and the through-hole 3 were not formed were laminated. The laminated body obtained after stacking 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 drawn out, using a conductive paste for external terminal electrodes containing silver as a main component (Fig. 6), after baking at 700 ° C, these external terminal electrodes 5 are plated with Ni and Sn, and the spiral coil that wraps around in a triangular shape as shown in Fig. A multilayer inductor array installed inside was obtained.

When the crosstalk between 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 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 a coil having the shape shown in FIG. 2 was internally provided, and crosstalk between adjacent inner conductor patterns was produced. Was -16 dB, and magnetic induction occurred between the adjacent coils.

[0015]

[Effect of the device]

 In the composite electronic component of the present invention, magnetic induction between the coil conductors is less likely to occur when the lead pitch is narrowed compared to the conventional product. Therefore, crosstalk between coil conductors is reduced, deterioration of magnetic characteristics is prevented, and an inductor array with a narrow lead pitch can be provided.

[Brief description of drawings]

FIG. 1 is a perspective plan view from a top surface of a laminated inductor array which is an example of a composite electronic component of the present invention.

FIG. 2 is a perspective plan view from the top of a laminated inductor array that is an example of a conventional composite electronic component.

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.

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 ... Internal conductor pattern 3 ... Through hole 4 ... Green sheet 5 ... External terminal electrode 6 ... Coil

Claims (1)

[Scope of utility model registration request] 1. Inside a plate-shaped ferrite body, a plurality of spirally-wound conductor coils are arranged in a row at regular intervals in two rows in the length direction of the body, and each coil is provided internally. A composite electronic component, which is arranged in parallel to a coil conductor terminal end lead-out end face at a pitch corresponding to the pitch, and is connected to each of a plurality of formed line-shaped external terminal electrodes, wherein the coil conductor has a coil axial center. The coils should be spirally wound so that their orthogonal cross sections become triangles, and adjacent coils should be arranged in a zigzag manner such that the corresponding vertices of their cross-section triangles face opposite directions and the opposite sides are parallel. A composite electronic component.