JP2017050401A - Composite component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite component that can acquire an attenuation amount of common noise in a broad frequency band.SOLUTION: A composite component includes a laminated body 12 configured by laminating plural insulator layers 11, plural internal conductors 13 arranged in the laminated body 12, a first coil 14 and a second coil 15 which are formed by connecting the plural inner conductors 13 to one another, and an antistatic element 16 arranged below the first and second coils 14 and 15 in the lamination direction of the plural insulator layers 11 in the laminate 12. The antistatic element 16 has a ground electrode 17 and is connected to the first and second coils 14 and 15, and a metal layer 18 connected to the ground electrode 17 is formed above the first and second coils 14 and 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a composite part of a common mode noise filter and an anti-static part used in various electronic equipment such as digital equipment, AV equipment, and information communication terminals.

  As shown in FIG. 7, a conventional composite component of this type includes a laminate 2 formed by laminating a plurality of insulator layers 1, and a plurality of internal conductors 3 disposed in the laminate 2. The first coil 4 and the second coil 5 configured by connecting the plurality of inner conductors 3 to each other, and the first insulator in the stacking direction of the plurality of insulator layers 1 in the stack 2. , The anti-static element 6 disposed below the second coils 4 and 5, and the anti-static element 6 has a ground electrode 7 and is connected to the first and second coils 4 and 5. It was.

  With this configuration, a composite part is formed by laminating the common mode noise filter unit 8 including the first and second coils 4 and 5 and the electrostatic countermeasure unit 9 including the electrostatic countermeasure element 6 and the ground electrode 7. In addition to attenuating noise, electronic devices can be reliably protected from overvoltage even when overvoltage is applied.

  As prior art document information relating to the invention of this application, for example, Patent Document 1 is known.

Japanese Patent Laying-Open No. 2015-76522

  The above-described conventional composite component can obtain only the frequency characteristics of the common mode noise filter unit 8 itself when common mode noise enters, so that there is only one attenuation pole due to self resonance. There has been a problem that attenuation cannot be obtained in frequency bands other than frequencies, and attenuation of common mode noise cannot be obtained in a wide frequency band.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a composite part that can obtain an attenuation amount of common mode noise in a wide frequency band.

  In order to achieve the above object, the present invention has an antistatic element disposed below the first and second coils in the stacking direction of the plurality of insulator layers in the stack, and the antistatic element includes a ground electrode. Provided and connected to the first and second coils, and further, a metal layer connected to the ground is formed above the first and second coils.

  As described above, in the composite component of the present invention, when common mode noise enters, the stray capacitance generated between the first and second coils and the metal layer in the high frequency region is Because it becomes more dominant than the stray capacitance generated in the input / output section, high-frequency common mode noise can be bypassed to the ground by the stray capacitance generated between the first and second coils and the metal layer. Thus, an excellent effect is obtained that an attenuation amount of common mode noise can be obtained in a wide frequency band.

Sectional drawing of the composite component in one embodiment of this invention Sectional view of another example of the composite part Sectional view of another example of the composite part Sectional view of another example of the composite part Sectional view of another example of the composite part Sectional view of another example of the composite part Cross-sectional view of conventional composite parts

  FIG. 1 is a cross-sectional view of a composite part in one embodiment of the present invention.

  As shown in FIG. 1, the composite component according to the embodiment of the present invention includes a laminated body 12 formed by laminating a plurality of insulator layers 11, and a plurality of internal parts arranged in the laminated body 12. A conductor 13, a first coil 14 and a second coil 15 configured by connecting the plurality of inner conductors 13 to each other, and a stacking direction of the plurality of insulator layers 11 in the stacked body 12. And an anti-static element 16 disposed below the first and second coils 14 and 15.

  The electrostatic protection element 16 has a ground electrode 17 and is connected to the first and second coils 14 and 15. A metal layer 18 connected to the ground electrode 17 is formed above the first and second coils 14 and 15.

  With this configuration, a composite component is formed by laminating a common mode noise filter unit 19 including the first and second coils 14 and 15, an electrostatic countermeasure unit 16 including the electrostatic countermeasure element 16, and the ground electrode 17.

  In the above configuration, the plurality of insulator layers 11 are in the form of a sheet and are laminated in order from the bottom to form the laminate 12. Further, it is made of a non-ferromagnetic material, for example, a non-magnetic material such as Cu—Zn ferrite or glass ceramic, or a magnetic material such as Ni—Cu—Zn ferrite.

  Here, the first and second coils 14 and 15 are surrounded by an insulator layer 11 made of a nonmagnetic material. Further, a first magnetic layer 21 made of a magnetic material is provided above the first and second coils 14 and 15, and the upper surface of the first magnetic layer 21 is made of a non-magnetic material. The first nonmagnetic material layer 22 is provided, and a third magnetic material layer 23 is provided on the upper surface of the first nonmagnetic material layer 22.

  Furthermore, a second magnetic layer 24 made of a magnetic material is provided between the first and second coils 14 and 15, the antistatic element 16, and the ground electrode 17.

  The first coil 14 is configured by connecting two inner conductors 13 to each other. Similarly, the second coil 15 is configured by connecting the other two inner conductors 13 to each other. ing.

  The inner conductor 13 is formed by spirally plating or printing a conductive material such as silver.

  At this time, the inner conductor 13 constituting the first coil 14 and the inner conductor 13 constituting the second coil 15 are laminated alternately. Here, a part of the first coil 14 and the second coil 15 are arranged at substantially the same position in a top view and magnetically coupled to each other to constitute a common mode noise filter unit 19 that removes common mode noise. To do. The first coil 14 and the second coil 15 are connected to a signal line.

  The anti-static element 16 normally functions as an insulator and is energized when a predetermined voltage or higher is applied. The electrostatic protection element 16 is made of a voltage-dependent resistance material, and the voltage-dependent resistance material includes at least one of varistor materials such as a ceramic material mainly composed of zinc oxide, aluminum, nickel, and copper. A material made of metal powder and a resin containing at least one of silicon, epoxy, and phenol is used.

  The static electricity countermeasure element 16 is provided between a pair of ground electrodes 17 and further has a discharge electrode (hereinafter not shown) connected to the first and second coils 14 and 15. In FIG. 1, the number of antistatic elements 16 is one, but there may be two or more.

  Here, the ground electrode 17 is connected to the ground, and is formed by printing or plating a metal such as silver in a plate shape or attaching a metal foil made of a metal such as silver.

  Note that the static electricity countermeasure element 16 may be a space or a space containing metal particles instead of the voltage-dependent resistance material. In addition, the ground electrode 17 and the discharge electrode may be entirely or partially formed in different layers with respect to the static electricity countermeasure element 16.

  The antistatic element 16, the ground electrode 17, and the discharge electrode are disposed below the first and second coils 14 and 15 via the second magnetic layer 24 made of a magnetic material. It is surrounded by a second non-magnetic layer 25 made of a magnetic material. A fourth magnetic layer 26 made of a magnetic material is formed below the second nonmagnetic material layer 25.

  A static electricity countermeasure unit 20 is constituted by the static electricity countermeasure element 16, the ground electrode 17, and the discharge electrode configured as described above. In the static electricity countermeasure unit 20, normally, no current flows through the static electricity countermeasure element 16 and no current flows through the ground electrode 17 to the ground, but the first and second coils 14 and 15 (signal lines) are predetermined. When the above voltage is applied, a current flows to the anti-static element 16 through the discharge electrode, a current flows from the ground electrode 17 to the ground, and a current flows to the first and second coils 14 and 15. Does not flow, thereby protecting the electronic device from overvoltage.

  Further, the metal layer 18 is provided in the first magnetic layer 21 above the first and second coils 14 and 15, and a metal such as silver is printed, plated, or silver. It is continuously formed by attaching a metal foil made of the above metal.

The metal layer 18 is connected to a pair of ground electrodes 17 and the ground, and the shape, size, and area thereof are appropriately determined according to desired characteristics.
The metal layer 18 faces either one of the first and second coils 14 and 15, and the facing portion becomes a part rather than the entire coil.

  The first magnetic layer 21, the first nonmagnetic layer 22, the third magnetic layer 23, the second magnetic layer 24, the second nonmagnetic layer 25, and the fourth magnetic layer. The number of sheets constituting H.26 is not limited to the number shown in FIG.

  And the laminated body 12 is formed by the above-mentioned structure, and the some external electrode (henceforth not shown) is provided in the surface of this laminated body 12. FIG. Each external electrode is connected to both ends of the first and second coils 14, 15, the ground electrode 17, the discharge electrode, and the metal layer 18.

  The connection between the first and second coils 14 and 15 and the discharge electrode and the connection between the ground electrode 17 and the metal layer 18 are made through external electrodes.

  As described above, in the composite component according to the embodiment of the present invention, when common mode noise enters, it is generated between the first and second coils 14 and 15 and the metal layer 18 in the high frequency region. The stray capacitance becomes more dominant than the stray capacitance generated at the input / output unit of the common mode filter unit 19 (first and second coils 14 and 15), and thereby the first and second coils 14 and 15 and Since the high-frequency common mode noise can be bypassed to the ground by the stray capacitance generated between the metal layer 18 and the common mode noise can be attenuated in a wide frequency band. .

  In addition, as shown in FIG. 2, the metal layer 18 may be formed inside the first nonmagnetic layer 22.

  In this configuration, since the distance between the metal layer 18 and the first and second coils 14 and 15 is increased, the stray capacitance generated between the first and second coils 14 and 15 and the metal layer 18 is reduced. However, since the attenuation pole shifts to the higher frequency band side, the attenuation amount of the common mode noise can be obtained in a wider frequency band.

  Furthermore, plate-like metals (metal layer 18 and ground electrode 17) are formed on the first nonmagnetic layer 22 and the second nonmagnetic layer 25 above and below the first and second coils 14 and 15, respectively. Therefore, the structure has good symmetry, and this can prevent the laminate 12 from being deformed during firing. If glass is used for the first nonmagnetic material layer 22, the infiltration of the sulfiding gas can be prevented by the glass denser than the ferrite, so that the sulfidation resistance is also improved.

  Further, as shown in FIG. 3, the metal layer 18 may be formed inside the first magnetic layer 21 and the other metal layer 18 a may be formed inside the first nonmagnetic layer 22.

  With this configuration, since the distances between the first and second coils 14 and 15 of the two metal layers 18 and 18a are different, the first and second coils 14 and 15 and the metal layer 18 Since different stray capacitances are generated between the first and second coils 14, 15 and 18a, the attenuation poles can be further increased, so that attenuation of common mode noise in a wider frequency band is possible. The quantity can be obtained.

  Furthermore, as shown in FIG. 4, the metal layer 18 may be formed inside the first magnetic layer 21 and the other metal layer 18 a may be formed inside the second magnetic layer 24.

  In this configuration, stray capacitance is generated both between the first and second coils 14 and 15 and the metal layer 18 and between the first and second coils 14 and 15 and the other metal layer 18a. Since the stray capacitance is increased and the attenuation pole is shifted to the higher frequency band side, the attenuation amount of the common mode noise can be obtained in a wider frequency band.

  Further, as shown in FIG. 5, the metal layer 18 may be formed inside the first nonmagnetic layer 22 and inside the other metal layer 18 a and the second magnetic layer 24. Then, as shown in FIG. 6, the metal layer 18 may be formed inside the third magnetic layer 23 located at the top of the stacked body 12.

  Here, as shown in FIGS. 3 to 5, when there are two metal layers 18, 18 a, the shape and size may be the same or different. If the shape and size are different, the characteristics can be easily fine-tuned.

  Furthermore, a nonmagnetic layer may be formed outside the third magnetic layer 23 located at the top of the multilayer body 12 and outside the fourth magnetic layer 26 located at the bottom.

  In the first embodiment of the present invention, the internal conductors 13 constituting the first coil 14 and the internal conductors 13 constituting the second coil 15 are alternately arranged, but the first coil 14 is constituted. The inner conductor 13 constituting the second coil 15 may be disposed between the two inner conductors 13.

  Further, the inner conductor 13 may have a shape other than the spiral shape, for example, a straight shape or an L shape. Furthermore, the mounting surface may be either the upper surface or the lower surface of the laminate 12.

  1 to 6, the metal layer 18 and the other metal layer 18 a are replaced with a first magnetic layer 21, a first nonmagnetic layer 22, a third magnetic layer 23, and a second magnetic body. Although formed in the central portion in the thickness direction of the layer 24 (stacking direction of the plurality of insulator layers 11), it may be formed in a location shifted from the central portion. Since the distance between the first and second coils 14 and 15 can be finely adjusted, the desired attenuation characteristic can be obtained.

  In the above-described composite component according to the embodiment of the present invention, the first coil 14 and the second coil 15 are provided, but two or more may be provided as an array type. .

  The composite component according to the present invention has an effect that an attenuation amount of common mode noise can be obtained in a wide frequency band, and is particularly used in various electronic devices such as digital devices, AV devices, and information communication terminals. This is useful in a composite part common mode noise filter including a common mode noise filter and a static electricity countermeasure part.

DESCRIPTION OF SYMBOLS 11 Insulator layer 12 Laminated body 13 Inner conductor 14 1st coil 15 2nd coil 16 Antistatic element 17 Ground electrode 18 Metal layer 21 1st magnetic layer 22 1st nonmagnetic layer 23 3rd magnetism Body layer 24 Second magnetic layer 25 Second non-magnetic layer 26 Fourth magnetic layer

Claims (6)

A laminated body constituted by laminating a plurality of insulator layers; a plurality of internal conductors arranged in the laminated body; a first coil constituted by connecting the plurality of internal conductors to each other; and A second coil; and an antistatic element disposed below the first and second coils in the stacking direction of the plurality of insulator layers in the stacked body, wherein the antistatic element includes a ground electrode. And a composite component connected to the first and second coils and having a metal layer connected to the ground electrode above the first and second coils. 2. The composite according to claim 1, wherein a first magnetic layer made of a magnetic material is formed above the first and second coils, and the metal layer is provided inside the first magnetic material layer. parts. A first non-magnetic layer made of a non-magnetic material made of glass is further formed above the first magnetic layer above the first and second coils, and the metal layer is formed as the first magnetic layer. The composite component according to claim 1, wherein the composite component is provided inside the nonmagnetic layer. The composite component according to claim 3, wherein another metal layer is provided inside the first magnetic layer. The second magnetic body layer made of a magnetic material is formed between the first and second coils and the ground electrode, and another metal layer is provided inside the second magnetic material layer. The composite part according to any one of 2 and 3. Forming a first non-magnetic material layer made of a non-magnetic material made of glass above the first magnetic material layer above the first and second coils, and the first non-magnetic material; The composite part according to claim 1, wherein a third magnetic layer made of a magnetic material is formed above the layer, and the metal layer is provided inside the third magnetic material layer.

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