Laminated coil components

Abstract

To provide a laminate coil component capable of improving characteristics while securing the strength of an element assembly.SOLUTION: A laminate coil component 1 includes: an element assembly 2 including a principal surface 2d (a mounting surface) and a principal surface 2c; a pair of terminal electrodes 3, 4 arranged on the principal surface 2d of the element assembly 2; and a coil 5 arranged in the element assembly 2 and electrically connected to the pair of terminal electrodes 3, 4. The element assembly 2 is configured to include at least each one layer of element assembly layers L1, L3, L5, L7, L9, L11 including fillers and element assembly layers L2, L4, L6, L8, L10, L12 lower in dielectric constant than the element assembly layers L1, L3, L5, L7, L9, L11, between first wiring parts 6 and the terminal electrodes 3, 4.SELECTED DRAWING: Figure 2

Description

Technical Field

[0006] , ,

[0001] The present invention relates to a multilayer coil component.

Background Art

[0002] As a conventional multilayer coil component, for example, the one described in Patent Document 1 is known. The multilayer coil component described in Patent Document 1 includes a body made of resin, a coil disposed within the body, and a pair of terminal electrodes disposed on the mounting surface of the body.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a multilayer coil component, in order to reduce the stray capacitance formed between the terminal electrode and the coil and improve the Q characteristic in the high-frequency range, the body is formed of a material having a low relative dielectric constant. However, when the body is formed of a material having a low relative dielectric constant, there is a risk that the strength of the body cannot be ensured. <所

[0005] One aspect of the present invention aims to provide a multilayer coil component capable of improving characteristics while ensuring the strength of the body.

Means for Solving the Problems

[0006] A laminated coil component according to one aspect of the present invention comprises a base body including a mounting surface and a main surface facing the mounting surface; a pair of terminal electrodes disposed on the mounting surface of the base body; and a coil disposed within the base body and electrically connected to the pair of terminal electrodes. The coil includes a first wiring section disposed on the main surface side, a second wiring section disposed on the mounting surface side, and a connecting section extending in the direction opposite to the mounting surface and the main surface, and connecting the first wiring section and the second wiring section. The base body is configured to include at least one first resin layer containing a filler and at least one second resin layer having a lower dielectric constant than the first resin layer, between the first wiring section and the terminal electrodes.

[0007] In a laminated coil component according to one aspect of the present invention, the base body is configured to include at least one first resin layer containing a filler and at least one second resin layer with a lower dielectric constant than the first resin layer, between the first wiring section and the terminal electrode. In the laminated coil component, the strength of the base body can be ensured because the base body contains a first resin layer containing a filler. Furthermore, in the laminated coil component, the stray capacitance formed between the terminal electrode and the coil can be reduced because the base body contains a second resin layer with a lower dielectric constant than the first resin layer. Therefore, the decrease in the self-resonant frequency can be suppressed in the laminated coil component. Consequently, the Q characteristics in the high-frequency range can be improved in the laminated coil component. As described above, the characteristics can be improved in the laminated coil component while ensuring the strength of the base body.

[0008] In one embodiment, the main surface may be composed of a first resin layer. This configuration ensures the strength of the main surface of the base material.

[0009] In one embodiment, the thickness of the first resin layer in the direction opposite the mounting surface and the main surface may be smaller than the thickness of the second resin layer. In this configuration, the thickness of the second resin layer, which has a lower dielectric constant, is larger in the base body (the proportion of the base body occupied by the second resin layer is larger), which can reduce the stray capacitance formed between the terminal electrode and the coil.

[0010] In one embodiment, the base material may have multiple first resin layers and multiple second resin layers arranged alternately. This configuration allows for improved properties while ensuring the strength of the base material. [Effects of the Invention]

[0011] According to one aspect of the present invention, it is possible to improve the properties while ensuring the strength of the base material. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a perspective view of a laminated coil component according to one embodiment. [Figure 2] Figure 2 shows the cross-sectional configuration of a laminated coil component. [Modes for carrying out the invention]

[0013] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant descriptions will be omitted.

[0014] The laminated coil component according to this embodiment will be described with reference to Figure 1. Figure 1 is a perspective view of a laminated coil component according to one embodiment. As shown in Figure 1, the laminated coil component 1 comprises a base body 2, a first terminal electrode 3 and a second terminal electrode 4, a coil 5, a first connection part 10 and a second connection part 11. In Figure 1, for the sake of explanation, the base body 2 is shown by a dashed line.

[0015] Body 2 has a rectangular parallelepiped shape. The rectangular parallelepiped shape includes a rectangular parallelepiped with chamfered corners and edges, and a rectangular parallelepiped with rounded corners and edges. Body 2 has a pair of end faces 2a, 2b, a pair of main faces 2c, 2d, and a pair of side faces 2e, 2f as its outer surfaces. The end faces 2a, 2b face each other. The main faces 2c, 2d face each other. The side faces 2e, 2f face each other. Hereafter, the opposing direction of the end faces 2a, 2b will be referred to as the first direction D1, the opposing direction of the main faces 2c, 2d as the second direction D2, and the opposing direction of the side faces 2e, 2f as the third direction D3. The first direction D1, the second direction D2, and the third direction D3 are approximately orthogonal to each other.

[0016] The end faces 2a and 2b extend in the second direction D2 to connect the main faces 2c and 2d. The end faces 2a and 2b also extend in the third direction D3 to connect the side faces 2e and 2f. The main faces 2c and 2d extend in the first direction D1 to connect the end faces 2a and 2b. The main faces 2c and 2d also extend in the third direction D3 to connect the side faces 2e and 2f. The side faces 2e and 2f extend in the first direction D1 to connect the end faces 2a and 2b. The side faces 2e and 2f also extend in the second direction D2 to connect the main faces 2c and 2d.

[0017] The main surface 2d is the mounting surface, and is the surface that faces other electronic devices (e.g., circuit boards or multilayer electronic components) when mounting the multilayer coil component 1 to other electronic devices (not shown). The end surfaces 2a and 2b are surfaces that are continuous with the mounting surface (i.e., the main surface 2d).

[0018] The length of the base body 2 in the first direction D1 is longer than the length of the base body 2 in the second direction D2 and the length of the base body 2 in the third direction D3. The length of the base body 2 in the second direction D2 is shorter than the length of the base body 2 in the third direction D3. That is, in this embodiment, the end faces 2a, 2b, main faces 2c, 2d and side faces 2e, 2f are rectangular in shape. The length of the base body 2 in the second direction D2 may be equal to the length of the base body 2 in the third direction D3, or it may be longer than the length of the base body 2 in the third direction D3.

[0019] In addition, in this embodiment, "equivalent" may include values with slight differences or manufacturing errors within a preset range in addition to being equal. For example, if a plurality of values are within the range of ±5% of the average value of the plurality of values, the plurality of values are defined as equivalent.

[0020] The base body 2 is formed by laminating a plurality of base body layers (first resin layer, second resin layer) L1 to L15 (see FIG. 2) in the second direction D2. That is, the lamination direction of the base body 2 is the second direction D2. The specific lamination configuration of the base body 2 will be described later. In the actual base body 2, the plurality of base body layers L1 to L15 may be integrated so that the boundaries between the layers are not visible, or may be integrated so that the boundaries between the layers are visible.

[0021] Each of the first terminal electrode 3 and the second terminal electrode 4 is provided on the base body 2. Each of the first terminal electrode 3 and the second terminal electrode 4 is disposed on the main surface 2d of the base body 2. The first terminal electrode 3 and the second terminal electrode 4 are provided on the base body 2 so as to be separated from each other in the first direction D1. Specifically, the first terminal electrode 3 is disposed on the end face 2a side of the base body 2. The second terminal electrode 4 is disposed on the end face 2b side of the base body 2.

[0022] Each of the first terminal electrode 3 and the second terminal electrode 4 has a rectangular shape (rectangular shape). Each of the first terminal electrode 3 and the second terminal electrode 4 is disposed such that each side is along the first direction D1 or the third direction D3. As shown in FIG. 2, the first terminal electrode 3 and the second terminal electrode 4 protrude from the main surface 2d. That is, in this embodiment, the surfaces of each of the first terminal electrode 3 and the second terminal electrode 4 are not flush with the main surface 2d. The first terminal electrode 3 and the second terminal electrode 4 are made of a conductive material (for example, Cu).

[0023] On each of the first terminal electrode 3 and the second terminal electrode 4, an electroplated or electroless plated layer (not shown), for example, a plating layer containing Ni, Sn, Au, etc., may be provided by electroplating or electroless plating. The plating layer may have, for example, a Ni plating film containing Ni and covering the first terminal electrode 3 and the second terminal electrode 4, and an Au plating film containing Au and covering the Ni plating film.

[0024] The coil 5 is disposed within the element body 2. The coil 5 has a plurality of first wiring portions �, a plurality of second wiring portions 7, a plurality of first pillar portions (connection portions) 8, and a plurality of second pillar portions (connection portions) 9. The coil 5 is constituted by electrically connecting the first wiring portion �, the second wiring portion 7, the first pillar portion 8, and the second pillar portion 9. The coil axis of the coil 5 is provided along the third direction D3. The plurality of first wiring portions �, the plurality of second wiring portions 7, the plurality of first pillar portions 8, and the plurality of second pillar portions 9 are constituted of a conductive material (for example, Cu). The first wiring portion �, the second wiring portion 7, the first pillar portion 8, and the second pillar portion 9 are disposed spaced apart from the end faces 2a, 2b, the main faces 2c, 2d, and the side faces 2e, 2f.

[0025] Each of the first wiring portions � is disposed on the main face 2c side of the element body 2. Each of the first wiring portions � extends along the first direction D1. Each of the first wiring portions � connects the first pillar portion 8 and the second pillar portion 9. The first wiring portion � spans across the first pillar portion 8 and the second pillar portion 9. One end portion (the end portion on the end face 2a side) in the extending direction of the first wiring portion � is connected to one end portion (the end portion on the main face 2c side) of the first pillar portion 8. The other end portion (the end portion on the end face 2b side) in the extending direction of the first wiring portion � is connected to one end portion of the second pillar portion 9.

[0026] Each of the second wiring sections 7 is located on the main surface 2d (mounting surface) side of the base body 2. Each of the second wiring sections 7 extends in the first direction D1. Each of the second wiring sections 7 connects the first pillar section 8 and the second pillar section 9. The second wiring section 7 spans across the first pillar section 8 and the second pillar section 9. One end of the second wiring section 7 in the direction of extension (the end on the end face 2a side) is connected to the other end of the first pillar section 8 (the end on the main surface 2d side). The other end of the second wiring section 7 in the direction of extension (the end on the end face 2b side) is connected to the other end of the second pillar section 9. The number of multiple second wiring sections 7 is one less than the number of multiple first wiring sections 6. That is, if there are n first wiring sections 6, there will be n-1 second wiring sections 7.

[0027] Each of the first pillar sections 8 is positioned on the end face 2a side of the base body 2. Each of the first pillar sections 8 extends along the second direction D2. The first pillar sections 8 connect the first wiring section 6 and the second wiring section 7. One end of the first pillar section 8 is connected to one end of the first wiring section 6. The other end of the first pillar section 8 is connected to one end of the second wiring section 7.

[0028] Each of the second pillar sections 9 is positioned on the end face 2b side of the base body 2. The second pillar sections 9 connect the first wiring section 6 and the second wiring section 7. One end of the second pillar section 9 is connected to the other end of the first wiring section 6. The other end of the second pillar section 9 is connected to the other end of the second wiring section 7.

[0029] The first connection portion 10 connects the first terminal electrode 3 to one end of the coil 5. The first connection portion 10 is connected to the other end of the first pillar portion 8 of the coil 5. The first connection portion 10 is made of a conductive material (for example, Cu).

[0030] The second connection portion 11 connects the second terminal electrode 4 to the other end of the coil 5. The second connection portion 11 is connected to the other end of the second pillar portion 9 of the coil 5. The second connection portion 11 is made of a conductive material (for example, Cu).

[0031] Figure 2 shows the cross-sectional configuration of the laminated coil component 1. In Figure 2, the cross-section of the laminated coil component 1 is shown along the second direction D2 and the third direction D3. Hatching is omitted in Figure 2. As shown in Figure 2, in the second direction D2, the base body 2 has base body layers L1 to L15 stacked in this order from the main surface 2d toward the main surface 2c. The outer surface of base body layer L1 constitutes the main surface 2d of base body 2. The outer surface of base body layer L15 constitutes the main surface 2c of base body 2.

[0032] The base layers L1 to L15 are resin layers. The material of the base layers L1 to L15 includes, for example, at least one selected from liquid crystal polymer, polyimide resin, crystalline polystyrene, epoxy resin, acrylic resin, bismaleide resin, and fluororesin.

[0033] The substrate layers L1, L3, L5, L7, L9, L11, L13, and L15 are resin layers (first resin layers) containing fillers. The fillers are, for example, inorganic fillers. Silica is an example of an inorganic filler. The relative permittivity of the substrate layers L1, L3, L5, L7, L9, L11, L13, and L15 is greater than 3.

[0034] The base layers L2, L4, L6, L8, L10, L12, and L14 are resin layers (second resin layers) that do not contain fillers. The relative permittivity of base layers L2, L4, L6, L8, L10, L12, and L14 is lower than that of base layers L1, L3, L5, L7, L9, L11, L13, and L15. In other words, the relative permittivity of base layers L1, L3, L5, L7, L9, L11, L13, and L15 is higher than that of base layers L2, L4, L6, L8, L10, L12, and L14. Base layers L2, L4, L6, L8, L10, L12, and L14 can be said to be low dielectric constant resin layers. The relative permittivity of the elemental layers L2, L4, L6, L8, L10, L12, and L14 is, for example, 3 or less.

[0035] In the base body 2, at least one layer each of a resin layer containing a filler and a resin layer without a filler is arranged between the first wiring section 6 and the first terminal electrode 3 and the second terminal electrode 4. In the base body 2 of this embodiment, resin layers containing a filler and resin layers without a filler are alternately arranged (laminated) between the first wiring section 6 and the first terminal electrode 3 and the second terminal electrode 4. Specifically, in the base body 2, base body layers L1, L3, L5, L7, L9, L11 and base body layers L2, L4, L6, L8, L10, L12 are alternately arranged between the first wiring section 6 and the first terminal electrode 3 and the second terminal electrode 4.

[0036] Between the first wiring section 6 and the first terminal electrode 3 and the second terminal electrode 4, the thickness of the elemental layers L1, L3, L5, L7, L9, L11 in the second direction D2 is smaller (thinner) than the thickness of the elemental layers L2, L4, L6, L8, L10, L12 in the second direction D2. In other words, the thickness of the elemental layers L2, L4, L6, L8, L10, L12 in the second direction D2 is larger (thicker) than the thickness of the elemental layers L1, L3, L5, L7, L9, L11 in the second direction D2. In elemental 2, the total thickness of elemental layers L2, L4, L6, L8, L10, L12, L14 is greater than the total thickness of elemental layers L1, L3, L5, L7, L9, L11, L13, L15. In other words, in base model 2, the proportion (volume) occupied by base model layers L2, L4, L6, L8, L10, L12, and L14 is greater than the proportion occupied by base model layers L1, L3, L5, L7, L9, L11, L13, and L15.

[0037] The laminated coil component 1 can be manufactured, for example, as follows: The base layers L1 to L15 can be formed by laminating sheets that constitute the resin layer. The coil 5 (first wiring section 6, second wiring section 7, first pillar section 8, second pillar section 9), first connection section 10, and second connection section 11 can be manufactured using photolithography. "Photolithography" refers to any method that processes a layer containing a photosensitive material into a desired pattern by exposure and development, and is not limited to the type of mask.

[0038] As described above, in the laminated coil component 1 according to this embodiment, the base body 2 is composed of base body layers L1, L3, L5, L7, L9, L11, L13, L15 containing filler, and base body layers L2, L4, L6, L8, L10, L12, L14 with a lower relative permittivity than the base body layers L1, L3, L5, L7, L9, L11, L13, L15, located between the first wiring section 6 and the first terminal electrode 3 and the second terminal electrode 4. In the laminated coil component 1, since the base body 2 contains base body layers L1, L3, L5, L7, L9, L11, L13, L15, the strength of the base body 2 can be ensured. In addition, in the laminated coil component 1, since the base body 2 contains base body layers L2, L4, L6, L8, L10, L12, L14, the stray capacitance formed between the first terminal electrode 3 and the second terminal electrode 4 and the coil 5 can be reduced. Therefore, the multilayer coil component 1 can suppress the decrease in its self-resonant frequency. Consequently, the multilayer coil component 1 can further improve its Q characteristics in the high-frequency range.

[0039] In the laminated coil component 1 according to this embodiment, the main surface 2c of the base body 2 is composed of a base body layer L15 containing filler. This configuration ensures the strength of the main surface 2c of the base body 2. The main surface 2c of the base body 2 is the surface that is exposed when the laminated coil component 1 is mounted on electronic equipment or the like. Therefore, by ensuring the strength of the main surface 2c of the base body 2, it is possible to suppress defects such as damage (cracks) in the laminated coil component 1.

[0040] In the laminated coil component 1 according to this embodiment, the thickness of the elemental layers L1, L3, L5, L7, L9, L11 in the second direction D2 between the first wiring section 6 and the first terminal electrode 3 and the second terminal electrode 4 is smaller (thinner) than the thickness of the elemental layers L2, L4, L6, L8, L10, L12 in the second direction D2. In this configuration, the elemental layers L2, L4, L6, L8, L10, L12, which have a low relative permittivity, are thicker in the elemental 2 (the proportion of elemental layers L2, L4, L6, L8, L10, L12 in the elemental 2 increases), which reduces the stray capacitance formed between the first terminal electrode 3 and the second terminal electrode 4 and the coil 5.

[0041] In the laminated coil component 1 according to this embodiment, the base body 2 has base body layers L1, L3, L5, L7, L9, L11, L13, L15 and base body layers L2, L4, L6, L8, L10, L12, L14 arranged alternately. This configuration makes it possible to improve the characteristics while ensuring the strength of the base body 2.

[0042] While embodiments of the present invention have been described above, the present invention is not necessarily limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention.

[0043] In the above embodiment, a configuration in which the first terminal electrode 3 and the second terminal electrode 4 protrude beyond the main surface 2d was described as an example. However, the first terminal electrode 3 and the second terminal electrode 4 may be embedded within the base body 2. That is, the first terminal electrode 3 and the second terminal electrode 4 may be provided substantially flush with the main surface 2d. In this configuration, the plating layers provided on each of the first terminal electrode 3 and the second terminal electrode 4 may protrude beyond the main surface 2d.

[0044] In the above embodiment, a configuration in which the base layer L1 constituting the main surface 2d (mounting surface) of the base body 2 is a resin layer containing a filler was described as an example. However, the main surface 2d of the base body 2 may be composed of a resin layer that does not contain a filler.

[0045] In the above embodiment, a configuration in which filler-containing substrate layers L1, L3, L5, L7, L9, L11, L13, L15 and filler-free substrate layers L2, L4, L6, L8, L10, L12, L14 are alternately arranged was described as one example. However, the substrate 2 only needs to include at least one layer of a first resin layer containing a filler and a second resin layer without a filler between the first terminal electrode 3 and the second terminal electrode 4 and the first wiring section 6.

[0046] In the above embodiment, the configuration of the coil 5 is not limited to the forms shown in Figures 1 and 2. [Explanation of symbols]

[0047] 1...Laminated coil component, 2...Base body, 2c...Main surface, 2d...Main surface (mounting surface), 5...Coil, 6...First wiring section, 7...Second wiring section, 8...First pillar section (connection section), 9...Second pillar section (connection section).

Claims

1. A base body including an implementation surface and a main surface facing the implementation surface, A pair of terminal electrodes arranged on the mounting surface of the base body, The body comprises a coil disposed within the aforementioned body and electrically connected to a pair of terminal electrodes, The coil includes a first wiring section located on the main surface side, a second wiring section located on the mounting surface side, and a connecting section that extends in the direction opposite to the mounting surface and the main surface and connects the first wiring section and the second wiring section. The aforementioned body is composed of a plurality of first resin layers containing a filler between the first wiring section and the terminal electrode, and a plurality of second resin layers having a lower dielectric constant than the first resin layers and not containing a filler, wherein the dielectric constant is 3 or less. A laminated coil component in which the first resin layer and the second resin layer are arranged in the region where the connecting portion is located in the base body.

2. The laminated coil component according to claim 1, wherein the main surface is composed of the first resin layer.

3. The laminated coil component according to claim 1 or 2, wherein the thickness of the first resin layer in the direction opposite to the mounting surface and the main surface is smaller than the thickness of the second resin layer.

4. The laminated coil component according to any one of claims 1 to 3, wherein the base body has a plurality of first resin layers and a plurality of second resin layers arranged alternately.

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