Laminated coil components

Abstract

The technical problem of the present invention is to provide a laminated coil component that can achieve improved winding efficiency and characteristics and can achieve simplified structure and improved withstand voltage. The laminated coil component (1) of the present invention includes a coil portion (C) inside an insulating element (2) having a laminated structure, and in a first conductor pattern layer (L1) and a second conductor pattern layer (L2) constituting the coil portion (C), the positions of the end pair (12a, 12b) of the outer conductor wire (12) and the end pair (13a, 13b) of the inner conductor wire (13) that are opposed to each other across a separation region (R) are offset in the line direction of the coil portion (C) passing through the separation region (R).

Description

Technical Field

[0001] The present disclosure relates to a laminated coil component. Background Art

[0002] In recent years, with the demand for miniaturization and high performance of electronic components, the miniaturization and improved characteristics of stacked coil components mounted on electronic components have been sought. For example, the stacked inductor described in Japanese Patent Publication No. 2000-216023 has a coil with a so-called multi-winding structure. In this existing stacked inductor, for example, the outer coil of each layer is wound from one side to the other side in the stacking direction, and the inner coil of each layer is wound from the other side to one side in the stacking direction. Summary of the invention

[0003] In the above-mentioned laminated coil components, in addition to miniaturization and improved characteristics, there are also technical problems such as simplification of structure and improvement of withstand voltage. For example, in the laminated inductor of the above-mentioned patent document 1, the winding efficiency is improved by forming a coil with a multi-winding structure, but on the other hand, the types of conductor patterns required increase, so it is considered that the production of each layer requires effort and time.

[0004] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a laminated coil component that can improve winding efficiency and characteristics, simplify the structure, and improve withstand voltage.

[0005] A stacked coil component according to one aspect of the present disclosure is a stacked coil component including a coil portion inside an insulating element body having a stacked structure, the coil portion comprising: a first conductor pattern layer having an annular outer conductor line and an inner conductor line which are partially separated in a prescribed separation area; a second conductor pattern layer having an outer connecting line which connects the outer conductor lines of the first conductor pattern layer adjacent to each other in the stacking direction in the separation area, and an inner connecting line which connects the inner conductor lines of the first conductor pattern layer adjacent to each other in the stacking direction in the separation area; and a third conductor pattern layer having a connecting line which connects the outer conductor line with the inner conductor line, wherein positions of an end pair of the outer conductor line and an end pair of the inner conductor line which are opposite to each other across the separation area, or positions of both ends of the outer connecting line and both ends of the inner conductor line in the separation area, are staggered in the line direction of the coil portion passing through the separation area.

[0006] In the stacked coil component, a coil portion with a multiple winding structure is formed in the element body by connecting the outer conductor wires and the inner conductor wires of the first conductor pattern layer adjacent in the stacking direction. By adopting the coil portion with the multiple winding structure, the winding efficiency can be improved. In the stacked coil component, the outer conductor wires and the inner conductor wires are connected to each other in a stepped shape by the outer connecting wires and the inner connecting wires located in the separation area of ​​the outer conductor wire and the inner conductor wire. Therefore, the inner diameter of the coil portion can be fully ensured, and the characteristics such as inductance value, DC superposition characteristics, and DC resistance can be improved. In addition, the types of conductor patterns required for the formation of the coil portion can be suppressed, and the effort and time required for the production of each layer can be avoided.

[0007] Furthermore, in the laminated coil component, the positions of the end pair of the outer conductor wire and the end pair of the inner conductor wire, which are opposite to each other across the separation area, or the positions of the two ends of the outer connecting wire and the two ends of the inner connecting wire in the separation area are staggered in the line direction of the coil portion passing through the separation area. Thus, the length of the area where the outer wire and the inner wire are parallel can be suppressed. The voltage of the area where the outer wire and the inner wire are parallel is easily consumed compared to other parts. Therefore, by suppressing the length of this area, the withstand voltage can be improved.

[0008] Alternatively, the positions of the two ends of the outer connecting wire and the two ends of the inner connecting wire in the separation area are aligned in the direction of the line passing through the coil portion of the separation area, and the positions of the end pair of the outer conductor wire and the end pair of the inner conductor wire that are opposite to each other across the separation area are staggered in the direction of the line passing through the coil portion of the separation area. According to this structure, the length of the area where the outer wire and the inner wire are parallel can be more reliably suppressed. Therefore, the withstand voltage can be further appropriately improved.

[0009] Alternatively, in the first conductor pattern layer, the resistivity of the region between the outer conductor line and the inner conductor line may be higher than the resistivity of the central region of the first conductor pattern layer. The region between the outer conductor line and the inner conductor line is more susceptible to voltage consumption than other portions. Therefore, by relatively increasing the resistivity of this region, the withstand voltage can be further increased.

[0010] Alternatively, in the second conductor pattern layer, the resistivity of the region between the outer conductor lines and the inner conductor lines of the first conductor pattern layer adjacent in the stacking direction may be higher than the resistivity of the central region of the second conductor pattern layer. The region between the outer conductor lines and the inner conductor lines of the first conductor pattern layer adjacent in the stacking direction is more likely to consume voltage than other portions. Therefore, by relatively increasing the resistivity of this region, the withstand voltage can be further increased.

[0011] Alternatively, the thickness of the second conductor pattern layer may be smaller than the thickness of the first conductor pattern layer. Thus, the thickness of the connection portion between the outer conductor wire and the inner conductor wire can be suppressed, and the coil portion can be wound more tightly in the stacking direction. In addition, by suppressing the thickness of the connection portion, the thermal shrinkage of the connection portion and the change in thickness caused by the thermal shrinkage can be suppressed. Therefore, the occurrence of disconnection of the connection portion can be suppressed.

[0012] Alternatively, a pair of terminal electrodes may be provided on one end face of the element body in the stacking direction, and the coil portion may include: a fourth conductor pattern layer having a lead conductor that connects the outer conductor wire to one of the pair of terminal electrodes and the inner conductor wire to the other of the pair of terminal electrodes. In this case, a so-called bottom terminal type stacked coil component may be formed. In a bottom terminal type stacked coil component, the mounting area may be suppressed, and high-density mounting may be achieved.

[0013] The third conductor pattern layer may connect the outer conductor line and the inner conductor line on the other end surface side of the element body in the stacking direction. Thereby, the number of turns of the coil portion can be sufficiently ensured.

[0014] According to the present disclosure, it is possible to improve winding efficiency and characteristics, simplify the structure, and improve the withstand voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic side view showing a laminated coil component according to an embodiment of the present invention.

[0016] Figure 2 It is schematically shown Figure 1 A diagram showing the structure of a coil portion of a laminated coil component.

[0017] Figure 3 It is shown Figure 1 FIG. 2 is a schematic exploded perspective view of an example of a layer structure of a laminated coil component shown in FIG.

[0018] Figure 4 (a) and (b) show Figure 1 The top view of the first conductor pattern layer of the laminated coil component shown in FIG. Figure 1 FIG. 1 is a top view of the second conductor pattern layer of the laminated coil component.

[0019] Figure 5 (a) is shown Figure 1 1 is a partially enlarged cross-sectional view schematically showing the structure of an outer winding body near the separation region of the laminated coil component, and (b) is a partially enlarged cross-sectional view schematically showing the structure of an inner winding body near the separation region.

[0020] Figure 6 It is shown Figure 1 FIG. 2 is a schematic exploded perspective view of another example of the layer structure of the laminated coil component shown in FIG.

[0021] Figure 7 (a) and (b) show Figure 6 The top view of the first conductor pattern layer of the laminated coil component shown in FIG. Figure 6 FIG. 1 is a top view of the second conductor pattern layer of the laminated coil component.

[0022] Figure 8 (a) is shown Figure 6 1 is a partially enlarged cross-sectional view schematically showing the structure of an outer winding body near the separation region of the laminated coil component, and (b) is a partially enlarged cross-sectional view schematically showing the structure of an inner winding body near the separation region.

[0023] Fig. 9 This is a schematic side view showing another modified example of a laminated coil component.

[0024] Fig.10 It is shown Figure 1 FIG. 2 is a schematic exploded perspective view of an example of a layer structure of a laminated coil component shown in FIG.

[0025] Fig.11 It is shown Figure 1 FIG. 2 is a schematic exploded perspective view of another example of the layer structure of the laminated coil component shown in FIG. DETAILED DESCRIPTION

[0026] Hereinafter, preferred embodiments of a laminated coil component according to one aspect of the present disclosure will be described in detail with reference to the drawings.

[0027] Figure 1 1 is a schematic side view showing a laminated coil component according to an embodiment of the present invention. The laminated coil component 1 is suitable for use in, for example, a bead inductor or a power inductor. Figure 1 As shown, the laminated coil component 1 includes an element body 2 having a rectangular parallelepiped shape and a pair of terminal electrodes 3 , 3 .

[0028] The element body 2 includes: a pair of end faces 2a and 2b facing each other, and a pair of end faces 2c and 2d facing each other in a direction orthogonal to the direction in which the end faces 2a and 2b face each other. Figure 1 The bottom surface in the figure is the surface that becomes the mounting surface of the laminated coil component 1. The mounting surface is the surface that faces other electronic devices (circuit substrates, electronic components, etc.) when the laminated coil component 1 is mounted on the other electronic devices. In addition, the rectangular parallelepiped shape here includes a rectangular parallelepiped shape with chamfered corners and ridges, and a rectangular parallelepiped shape with rounded corners and ridges.

[0029] The element body 2 is composed of a plurality of magnetic layers (refer to Figure 3 ) in a stacked structure. These multiple layers are stacked in the relative direction of the end faces 2a and 2b. That is, the stacking direction of the multiple layers is consistent with the relative direction of the end faces 2a and 2b (hereinafter, the relative direction of the end faces 2a and 2b is referred to as the "stacking direction"). In the actual element body 2, the multiple layers are integrated to the extent that the boundaries between the layers cannot be identified.

[0030] The element body 2 is composed of, for example, metal magnetic particles, ferrite, and glass ceramic materials. In the present embodiment, the element body 2 includes a plurality of metal magnetic particles (not shown). The metal magnetic particles are composed of, for example, soft magnetic alloys. The soft magnetic alloys are, for example, Fe-Si alloys and FeSiCr alloys. In the case where the soft magnetic alloy is a Fe-Si alloy, the soft magnetic alloy may also contain P. The soft magnetic alloy may also be, for example, a Fe-Ni-Si-M alloy. "M" includes one or more elements selected from Co, Cr, Mn, P, Ti, Zr, Hf, Nb, Ta, Mo, Mg, Ca, Sr, Ba, Zn, B, Al, and rare earth elements.

[0031] In the element body 2, the metal magnetic particles are bonded to each other. The bonding of the metal magnetic particles is achieved, for example, by bonding of oxide films formed on the surfaces of the metal magnetic particles. In addition, the element body 2 includes a portion filled with a resin. The resin is present in at least a portion between the plurality of metal magnetic particles. The resin is an electrically insulating resin. As the resin, for example, silicone resin, phenolic resin, acrylic resin, epoxy resin, etc. can be used. There may also be gaps between the plurality of metal magnetic particles that are not filled with resin.

[0032] Figure 1 The stacked coil component 1 shown is a so-called bottom terminal type. A pair of terminal electrodes 3, 3 are both in the shape of flat rectangular parallelepiped, and are arranged separately from each other on the end face 2a of the element body 2 along the relative directions of the end faces 2c, 2d. The terminal electrode 3 is composed of a conductive material. The conductive material is, for example, Ag or Pd. The terminal electrode 3 is, for example, a sintered electrode, and is composed of a sintered body of a conductive paste. The conductive paste contains conductive metal powder and glass powder. The conductive metal powder is, for example, Ag powder or Pd powder. A plating layer may also be formed on the surface of the terminal electrode 3. The plating layer is formed, for example, by electroplating. The electroplating is, for example, Ni plating or Sn plating.

[0033] Figure 2 It is schematically shown Figure 1 FIG. 1 is a diagram showing a structure of a coil portion of a laminated coil component. As shown in the figure, a coil portion C is provided inside the element body 2. Figure 2 As shown, the laminated coil component 1 has a coil portion C having a double winding structure of an outer winding body C1 and an inner winding body C2. The outer winding body C1 and the inner winding body C2 are wound in opposite directions. Figure 2 In the example, the outer winding body C1 is a winding body wound from the end face 2a side of the element body 2 to the end face 2b side, and the inner winding body C2 is a winding body wound from the end face 2b side of the element body 2 to the end face 2a side. One end of the outer winding body C1 is led out to the mounting surface (end face 2a) side of the element body 2 and connected to one of the pair of terminal electrodes 3, 3. One end of the inner winding body C2 is led out to the mounting surface (end face 2a) side of the element body 2 and connected to the other of the pair of terminal electrodes 3, 3. The other end of the outer winding body C1 is connected to the other end of the inner winding body C2 on the opposite side of the mounting surface (end face 2b).

[0034] Figure 3 It is shown Figure 1 1 is a schematic exploded perspective view of an example of the layer structure of the stacked coil component shown in FIG. As shown in the figure, the multiple layers constituting the coil portion C are composed of a covering layer Lc, a first conductor pattern layer L1, a second conductor pattern layer L2, a third conductor pattern layer L3, and a fourth conductor pattern layer L4. The covering layer Lc is a layer consisting only of a body portion 11 containing metal magnetic particles. A plurality of covering layers Lc are arranged on the end face 2b side of the body 2. Each layer other than the covering layer Lc is formed by hollowing out the body portion 11 containing the above-mentioned metal magnetic particles in a shape corresponding to the conductor portion, and arranging the conductor portion in the hollowed-out portion. Therefore, in each of these layers, the body portion 11 and the conductor portion become the same surface.

[0035] The conductor part is made of, for example, a metal material. The material of the metal material is not particularly limited, and for example, Ag, Cu, Au, Al, Pd, Pd / Ag alloy, etc. can be used. Ti compounds, Zr compounds, Si compounds, etc. can also be added to the metal material. The hollowing out of the element body part 11 can be done by, for example, laser processing. The formation of the conductor part can be done by, for example, a printing method or a thin film growth method.

[0036] The first conductor pattern layer L1 and the second conductor pattern layer L2 are layers that form the main parts of the coil part C, namely the outer winding body C1 and the inner winding body C2. In this embodiment, the first conductor pattern layer L1A, L1B and a second conductor pattern layer L2 are stacked in sequence to form a group, and a plurality of groups are provided in the stacked structure according to the required number of windings in the coil part C. Figure 3 In the example, the first conductor pattern layers L1A and L1B are stacked on the lower side of the plurality of groups (the end surface 2a side of the element 2), and the through hole layer L4a and the fourth conductor pattern layer L4 are also stacked on the lower side of the first conductor pattern layer L1B.

[0037] like Figure 4 (a) and Figure 4As shown in (b), the first conductor pattern layers L1A and L1B have an outer conductor line 12 and an inner conductor line 13 in an annular shape. The outer conductor line 12 is arranged in a rectangular annular shape that is one circle smaller than the outer shape of the first conductor pattern layer L1, and the inner conductor line 13 is arranged in a rectangular annular shape that is one circle smaller than the outer conductor line 12. The width of the outer conductor line 12 is the same as the width of the inner conductor line 13. The outer conductor line 12 and the inner conductor line 13 are separated by a gap smaller than the width of these lines. By suppressing the gap between the outer conductor line 12 and the inner conductor line 13, the inner diameters of the outer winding body C1 and the inner winding body C2 are fully ensured.

[0038] The outer conductor line 12 and the inner conductor line 13 are partially separated in a predetermined separation area R. The separation area R is, for example, less than 1 / 4 of the length of one turn of the outer conductor line 12 and the inner conductor line 13 and is substantially C-shaped in a plan view. Figure 4 (a) and Figure 4 In the example of (b), the surface ( Figure 1 The outer conductor line 12 has an end pair 12a, 12b facing each other across the separation region R. Similarly, the inner conductor line 13 has an end pair 13a, 13b facing each other across the separation region R. In either of the first conductor pattern layers L1A and L1B, the interval between the end pair 12a, 12b is equal to the interval between the end pair 12a, 12b.

[0039] On the other hand, the positions of the end pair 12a, 12b of the outer conductor line 12 and the end pair 13a, 13b of the inner conductor line 13 are offset in the line direction of the coil portion C passing through the separation region R (here, the relative direction of the end faces 2c, 2d of the element body 2). In the first conductor pattern layer L1A, the positions of the end pair 12a, 12b are closer to the end face 2c of the element body 2 than the center, and the positions of the end pair 13a, 13b are closer to the end face 2d of the element body 2 than the center (see FIG. Figure 4 (a)) In the first conductor pattern layer L1B, the end pair 12a, 12b is positioned closer to the end face 2d of the element body 2 than the center, and the end pair 13a, 13b is positioned closer to the end face 2c of the element body 2 than the center (see Figure 4 (b)).

[0040] The second conductor pattern layer L2 is a layer that connects the outer conductor lines 12, 12 and the inner conductor lines 13, 13 of the first conductor pattern layer L1 adjacent to each other in the stacking direction in a step-like manner. Figure 4As shown in (c), the second conductor pattern layer L2 has an outer connecting line 14 and an inner connecting line 15. The outer connecting line 14 and the inner connecting line 15 are both straight lines and are arranged corresponding to the separation area R. Figure 4 In the example (c), both ends 14a and 14b of the outer connecting wire 14 and both ends 15a and 15b of the inner connecting wire 15 are aligned in the line direction of the coil portion C passing through the separation region R.

[0041] The length of the outer connecting line 14 is greater than the distance between the end 12a of the outer conductor line 12 of the first conductor pattern layer L1A and the end 12b of the outer conductor line 12 of the second conductor pattern layer L2B when viewed from above. In addition, the length of the inner connecting line 15 is greater than the distance between the end 13a of the inner conductor line 13 of the first conductor pattern layer L1A and the end 13b of the inner conductor line 13 of the second conductor pattern layer L2B when viewed from above.

[0042] In the stacked state of the first conductor pattern layer L1A, the first conductor pattern layer L1B and the second conductor pattern layer L2, as shown in FIG. Figure 5 As shown in (a), the outer conductor lines 12, 12 of a group of the first conductor pattern layer L1A and the second conductor pattern layer L2B overlap each other in the stacking direction. Moreover, the end 14a of the outer connecting line 14 overlaps with the end 12a of the outer conductor line 12 of a group of the first conductor pattern layer L1A, and the end 14b of the outer connecting line 14 overlaps with the end 12b of the outer conductor line 12 of a group of the first conductor pattern layer L1B adjacent in the stacking direction. Thus, one group of outer conductor lines 12, 12 and another group of outer conductor lines 12, 12 are connected in a step-like manner by the outer connecting line 14, forming an outer winding body C1 that is wound from the end face 2a side of the element body 2 to the end face 2b side.

[0043] In addition, in the stacked state of the first conductor pattern layer L1A, the first conductor pattern layer L1B and the second conductor pattern layer L2, as shown in FIG. Figure 5 As shown in (b), the inner conductor lines 13, 13 of a group of the first conductor pattern layer L1A and the second conductor pattern layer L2B overlap each other in the stacking direction. Moreover, the end 15a of the inner connecting line 15 overlaps with the end 13a of the inner conductor line 13 of a group of the first conductor pattern layer L1A, and the end 15b of the inner connecting line 15 overlaps with the end 13b of the inner conductor line 13 of a group of the first conductor pattern layer L1B adjacent in the stacking direction. Thus, a group of the inner conductor lines 13, 13 and another group of the inner conductor lines 13, 13 are connected in a step-like manner by the inner connecting line 15, forming an inner winding body C2 that is wound from the end face 2b side of the element body 2 to the end face 2c side.

[0044] In addition, if Figure 5 (a) and Figure 5As shown in (b), the thickness of the second conductor pattern layer L2 is smaller than the thickness of the first conductor pattern layers L1A and L1B. The ratio of the thickness of the second conductor pattern layer L2 to the thickness of the first conductor pattern layers L1A and L1B is not particularly limited, and can be set to 1 / 2 or less, for example. The thickness of the first conductor pattern layer L1A and the thickness of the first conductor pattern layer L1B can be equal or different.

[0045] The third conductor pattern layer L3 is a layer connecting the outer winding body C1 and the inner winding body C2. Figure 3 As shown in FIG. 1 , the third conductor pattern layer L3 has a connection line 16 that connects the outer conductor line 12 and the inner conductor line 13. Figure 3 In the example of , the third conductor pattern layer L3 is stacked between the first conductor pattern layer L1A of the group located closest to the end surface 2b of the element body 2 and the cover layer Lc. The connecting line 16 extends obliquely at a position corresponding to the separation area R, and connects the end 14b of the outer connecting line 14 of the first conductor pattern layer L1A of the group located closest to the end surface 2b of the element body 2 to the end 15a of the inner connecting line 15.

[0046] The fourth conductor pattern layer L4 is a layer connecting the coil portion C and the terminal electrodes 3, 3. Figure 3 As shown in FIG. 1 , the fourth conductor pattern layer L4 is stacked on the side closest to the end surface 2a of the element body 2 via a through-hole layer L4a having through-holes 17A and 17B. The fourth conductor pattern layer L4 has a pair of lead conductors 18A and 18B. Figure 3 In the example of , the lead conductors 18A and 18B are both rectangular in plan view. The lead conductor 18A is arranged on the end face 2c side of the element body 2 and is connected to one terminal electrode 3. The lead conductor 18A is connected to the outer conductor line 12 of the first conductor pattern layer L1B located closest to the end face 2a side of the element body 2 via the through hole 17A. The lead conductor 18B is arranged on the end face 2d side of the element body 2 and is connected to the other terminal electrode 3. The lead conductor 18B is connected to the inner conductor line 13 of the first conductor pattern layer L1B located closest to the end face 2a side of the element body 2 via the through hole 17B.

[0047] In the present embodiment, in each of the above-mentioned layers, a high specific resistance region 20 having a higher resistivity than other regions is provided in a part of the element body portion 11. The resistivity here refers to electrical impedance. The resistivity of the element body portion 11 can be adjusted, for example, by adjusting the particle size of the metal magnetic particles contained in the element body 2. For example, by making the average particle size of the metal magnetic particles smaller than the average particle size of the metal magnetic particles in other regions, the high specific resistance region 20 can be arranged in a desired region.

[0048] In the first conductor pattern layer L1, the resistivity of the area between the outer conductor line 12 and the inner conductor line 13 is higher than the resistivity of the central area P of the first conductor pattern layer L1. Here, the central area P is located further inside than the inner conductor line 13 and is a rectangular area that is one circle smaller than the inner conductor line 13. Figure 3 In the example of FIG. 1 , even in any one of the first conductor pattern layers L1A and L1B, the high specific resistance region 20 is arranged so as to surround the outer conductor line 12 and the inner conductor line 13 except for the central region P. Thus, the region outside the outer conductor line 12, the region between the outer conductor line 12 and the inner conductor line 13, and the region between the inner conductor line 13 and the central region P together with the separation region R become the high specific resistance region 20.

[0049] In the second conductor pattern layer L2, a high specific resistance region 20 is arranged in the entire part except for the central region P. The high specific resistance region 20 of the second conductor pattern layer L2 overlaps with the high specific resistance region 20 of the first conductor pattern layer L1 when viewed from above, and the surroundings of the outer connecting line 14 and the inner connecting line 15 located in the separation region R also become the high specific resistance region 20. In addition, the outer conductor lines 12, 12 and the inner conductor lines 13, 13 of the first conductor pattern layer L1 adjacent in the stacking direction also become: the high specific resistance region 20 of the second conductor pattern layer L2 is arranged (refer to Figure 5 ).

[0050] As described above, in the laminated coil component 1, the outer conductor wires 12, 12 of the first conductor pattern layer L1 adjacent in the lamination direction are connected to each other and the inner conductor wires 13, 13 are connected to each other, so that a coil portion C of a multiple winding structure is formed in the element body 2. By adopting the coil portion C of the multiple winding structure, it is possible to achieve an improvement in winding efficiency. In the laminated coil component 1, the outer conductor wires 12, 12 and the inner conductor wires 13, 13 are connected to each other in a step-like manner by the outer connecting wire 14 and the inner connecting wire 15 located in the separation area R of the outer conductor wire 12 and the inner conductor wire 13. Therefore, the inner diameter of the coil portion C can be fully ensured, and characteristics such as inductance value, DC superposition characteristics, and DC resistance can be improved. In addition, in the laminated coil component 1, the types of conductor patterns required for the formation of the coil portion C can be suppressed, and the effort and time required for the production of each layer can be avoided.

[0051] Furthermore, in the laminated coil component 1, the positions of the two ends 14a, 14b of the outer connecting wire 14 and the two ends 15a, 15b of the inner connecting wire 15 in the separation region R are aligned in the line direction of the coil portion passing through the separation region, and the positions of the end pair 12a, 12a of the outer conductor wire 12 and the end pair 13a, 13b of the inner conductor wire 13 that are opposite to each other across the separation region R are staggered in the line direction of the coil portion C passing through the separation region R. Thus, the length of the region where the outer conductor wire 12 and the inner conductor wire 13 are parallel can be suppressed. The voltage of the region where the outer conductor wire 12 and the inner conductor wire 13 are parallel is easily consumed compared to other parts. Therefore, by suppressing the length of this region, the withstand voltage can be appropriately improved.

[0052] In the laminated coil component 1, in the first conductor pattern layer L1, the resistivity of the area between the outer conductor line 12 and the inner conductor line 13 may be higher than the resistivity of the central area P of the first conductor pattern layer L1. The area between the outer conductor line 12 and the inner conductor line 13 is more susceptible to voltage consumption than other parts. Therefore, by relatively increasing the resistivity of this area, the withstand voltage can be further increased.

[0053] In the laminated coil component 1, in the second conductor pattern layer L2, the resistivity of the region between the outer conductor lines 12, 12 and the inner conductor lines 13, 13 of the first conductor pattern layer L1 adjacent in the stacking direction is higher than the resistivity of the central region P of the second conductor pattern layer L2. The region between the outer conductor lines 12, 12 and the inner conductor lines 13, 13 of the first conductor pattern layer L1 adjacent in the stacking direction is more likely to consume voltage than other parts. Therefore, by relatively increasing the resistivity of this region, it is possible to further increase the withstand voltage.

[0054] In the laminated coil component 1, the thickness of the second conductor pattern layer L2 is smaller than the thickness of the first conductor pattern layer L1. Figure 5 (a) and Figure 5 In the example of (b), the thickness of the overlapping portion between the ends 12a, 12b of the outer conductor wire 12 and the ends 14a, 14b of the outer connecting wire 14, and the thickness of the overlapping portion between the ends 13a, 13b of the inner conductor wire 13 and the ends 15a, 15b of the inner connecting wire 15 are suppressed, and the coil portion C can be wound more tightly in the stacking direction. In addition, by suppressing the thickness of the connecting portion, the thermal shrinkage of the connecting portion and the change in thickness caused by the thermal shrinkage can be suppressed. Therefore, the occurrence of disconnection of the connecting portion can be suppressed.

[0055] In the laminated coil component 1, a pair of terminal electrodes 3, 3 are provided on the end face 2a in the lamination direction of the element body 2. In addition, the coil portion C has: a fourth conductor pattern layer L4, which has lead conductors 18A, 18B that connect the outer conductor line 12 to one of the pair of terminal electrodes 3, 3 and the inner conductor line 13 to the other of the pair of terminal electrodes 3, 3. Thus, a so-called bottom terminal type laminated coil component can be formed. In the bottom terminal type laminated coil component, the mounting area can be suppressed, and high-density mounting can be achieved.

[0056] In the laminated coil component 1, the third conductor pattern layer L3 connects the outer conductor wire 12 and the inner conductor wire 13 on the end surface 2b side in the lamination direction of the element body 2. Thus, the number of turns of the coil portion C can be sufficiently ensured.

[0057] The present disclosure is not limited to the above-mentioned embodiments. Figure 6 As shown, it is also possible that the positions of the end pair 12a, 12a of the outer conductor wire 12 and the end pair 13a, 13b of the inner conductor wire 13, which are opposite to each other across the separation area R, are aligned in the line direction of the coil portion C passing through the separation area R, and the positions of the two end portions 14a, 14b of the outer connecting wire 14 and the two end portions 15a, 15b of the inner connecting wire 15 in the separation area R are staggered in the line direction of the coil portion C passing through the separation area R.

[0058] exist Figure 6 In the example of FIG. 1 , a first conductor pattern layer L1 and a pair of second conductor pattern layers L2A and L2B are stacked in sequence to form a group, and a plurality of groups are provided in the stacked structure according to the required number of windings in the coil portion C. In the first conductor pattern layer L1, as shown in FIG. Figure 7 As shown in (a) of FIG. 1 , the positions of the pair of ends 12a and 12b of the outer conductor line 12 and the positions of the pair of ends 13a and 13b of the inner conductor line 13 are both symmetrical with respect to the center.

[0059] On the other hand, Figure 7 (a) and Figure 7 As shown in (b), the outer connecting wires 14 and the inner connecting wires 15 of the second conductor pattern layer L2A and the outer connecting wires 14 and the inner connecting wires 15 of the second conductor pattern layer L2B are arranged alternately in a plan view. That is, in the second conductor pattern layer L2A, the outer connecting wires 14 are closer to the end face 2c of the element body 2 than the center, and the inner connecting wires 15 are closer to the end face 2d of the element body 2 than the center. In addition, in the second conductor pattern layer L2B, the outer connecting wires 14 are closer to the end face 2d of the element body 2 than the center, and the inner connecting wires 15 are closer to the end face 2c of the element body 2 than the center.

[0060] In the stacked state of the first conductor pattern layer L1 and the second conductor pattern layers L2A and L2B, as shown in FIG. Figure 8As shown in (a), the end 14b of the outer connecting line 14 of the second conductor pattern layer L2A overlaps with the end 14a of the outer connecting line 14 of the second conductor pattern layer L2B in the stacking direction. In addition, the end 14a of the outer connecting line 14 of the second conductor pattern layer L2A overlaps with the end 12a of the outer conductor line 12 of a group of the first conductor pattern layer L1, and the end 14bb of the outer connecting line 14 of the second conductor pattern layer L2B overlaps with the end 12b of the outer conductor line 12 of a group of the first conductor pattern layer L1 adjacent in the stacking direction.

[0061] In addition, in the stacked state of the first conductor pattern layer L1 and the second conductor pattern layers L2A and L2B, as shown in FIG. Figure 8 As shown in (b), the end 15a of the inner connecting line 15 of the second conductor pattern layer L2A overlaps with the end 15b of the inner connecting line 15 of the second conductor pattern layer L2B in the stacking direction. In addition, the end 15b of the inner connecting line 15 of the second conductor pattern layer L2A overlaps with the end 13b of the inner conductor line 13 of a group of the first conductor pattern layer L1, and the end 15a of the inner connecting line 15 of the second conductor pattern layer L2B overlaps with the end 13a of the inner conductor line 13 of a group of the first conductor pattern layer L1 adjacent in the stacking direction.

[0062] In the above embodiment, a bottom terminal type laminated coil component 1 is exemplified in which a pair of terminal electrodes 3, 3 are provided on the end surface 2a of the element body 2 in the lamination direction. Fig. 9 As shown, a laminated coil component 21 of an end surface terminal type may be provided with terminal electrodes 3 at both end surfaces 2c and 2d in the longitudinal direction of the element body 2. Figure 3 The layer structure shown is used in the case of end-face terminal type, such as Fig.10 As shown, instead of the through hole layer L4a having through holes 17A and 17B and the fourth conductor pattern layer L4, a pair of fourth conductor pattern layers L4A and L4B and a plurality of covering layers Lc may be stacked on the lower side of the first conductor pattern layers L1A and L1B of the plurality of groups on the lower side (the end face 2a side of the element 2).

[0063] The fourth conductor pattern layer L4A has a lead conductor 21A and a through hole 22. The lead conductor 21A is rectangular in plan view and is arranged on the end face 2c side of the element body 2. The lead conductor 21A is connected to the outer conductor line 12 of the first conductor pattern layer L1B located closest to the end face 2a side of the element body 2 and a terminal electrode 3 provided on the end face 2c side. The through hole 22 and the lead conductor 21A are separately arranged on the end face 2d side of the element body 2, and are connected to the inner conductor line 13 of the first conductor pattern layer L1B located closest to the end face 2a side of the element body 2. In addition, Fig.10In the example of FIG. 1 , the element body portion 11 of the fourth conductor pattern layer L4A becomes the high specific resistance region 20 except for the central region P. Thus, both the lead conductor 21A and the through hole 22 are surrounded by the high specific resistance region 20 .

[0064] The fourth conductor pattern layer L4B has a lead conductor 21B. The lead conductor 21B is rectangular in plan view and is arranged on the end face 2d side of the element body 2. The lead conductor 21B connects the inner conductor line 13 of the first conductor pattern layer L1B located closest to the end face 2a side of the element body 2 to another terminal electrode 3 provided on the end face 2d side via the through hole 22 of the fourth conductor pattern layer L4A.

[0065] In the Figure 6 The same is true when the layer structure is applied to the end terminal type, for example Fig.11 As shown, instead of the layer L4a having the through holes 17A and 17B and the fourth conductor pattern layer L4, a plurality of layers are stacked on the lower layer side (the end surface 2a side of the element body 2) of the first conductor pattern layer L1. Fig.10 The pair of fourth conductor pattern layers L4A, 4B shown and a plurality of cover layers Lc may be used.

[0066] The high specific resistance region 20 may not necessarily be provided. In other words, the resistivity of the element body portion 11 constituting each layer may be constant. In this case, the structure can be simplified.

Claims

1. A laminated coil component, characterized in that: It is a laminated coil component that contains a coil part inside an insulating element body with a laminated structure. The coil portion has: a first conductor pattern layer including a loop-shaped outer conductor line and an inner conductor line partially separated in a predetermined separation region; a second conductor pattern layer having an outer connecting line for connecting the outer conductor lines of the first conductor pattern layer adjacent to each other in the stacking direction in the separation region, and an inner connecting line for connecting the inner conductor lines of the first conductor pattern layer adjacent to each other in the stacking direction in the separation region; and a third conductor pattern layer having a connection line connecting the outer conductor line and the inner conductor line, The separation region is a region that separates the outer conductor line and the inner conductor line together. The positions of the end pair of the outer conductor line and the end pair of the inner conductor line opposite to each other across the separation area, or the positions of the two ends of the outer connecting line and the two ends of the inner conductor line in the separation area, are offset in the extension direction of the conductor line including the ends passing through the separation area.

2. The laminated coil component according to claim 1, wherein: The positions of both ends of the outer connecting wire and both ends of the inner connecting wire in the separation area are aligned in the extending direction of the conductor line including the ends passing through the separation area, The positions of the pair of ends of the outer conductor wire and the pair of ends of the inner conductor wire, which are opposed to each other across the separation region, are offset in the extending direction of the conductor wires including the ends passing through the separation region.

3. The laminated coil component according to claim 1, wherein: In the first conductor pattern layer, the resistivity of a region between the outer conductor line and the inner conductor line is higher than the resistivity of a central region of the first conductor pattern layer.

4. The laminated coil component according to claim 2, wherein: In the first conductor pattern layer, the resistivity of a region between the outer conductor line and the inner conductor line is higher than the resistivity of a central region of the first conductor pattern layer.

5. The laminated coil component according to any one of claims 1 to 4, characterized in that: In the second conductor pattern layer, the resistivity of the regions between the outer conductor lines and the inner conductor lines of the first conductor pattern layer adjacent to each other in the stacking direction is higher than the resistivity of the central region of the second conductor pattern layer.

6. The laminated coil component according to any one of claims 1 to 4, characterized in that: The thickness of the second conductor pattern layer is smaller than the thickness of the first conductor pattern layer.

7. The laminated coil component according to claim 5, characterized in that: The thickness of the second conductor pattern layer is smaller than the thickness of the first conductor pattern layer.

8. The laminated coil component according to any one of claims 1 to 4, characterized in that: A pair of terminal electrodes is provided on one end surface of the element body in the stacking direction. The coil portion includes a fourth conductor pattern layer including a lead conductor that connects the outer conductor line to one of the pair of terminal electrodes and connects the inner conductor line to the other of the pair of terminal electrodes.

9. The laminated coil component according to claim 5, characterized in that: A pair of terminal electrodes is provided on one end surface of the element body in the stacking direction. The coil portion includes a fourth conductor pattern layer including a lead conductor that connects the outer conductor line to one of the pair of terminal electrodes and connects the inner conductor line to the other of the pair of terminal electrodes.

10. The laminated coil component according to claim 6, wherein: A pair of terminal electrodes is provided on one end surface of the element body in the stacking direction. The coil portion includes a fourth conductor pattern layer including a lead conductor that connects the outer conductor line to one of the pair of terminal electrodes and connects the inner conductor line to the other of the pair of terminal electrodes.

11. The laminated coil component according to claim 7, characterized in that: A pair of terminal electrodes is provided on one end surface of the element body in the stacking direction. The coil portion includes a fourth conductor pattern layer including a lead conductor that connects the outer conductor line to one of the pair of terminal electrodes and connects the inner conductor line to the other of the pair of terminal electrodes.

12. The laminated coil component according to claim 8, wherein: The third conductor pattern layer connects the outer conductor line and the inner conductor line on the other end surface side of the element body in the stacking direction.

13. The laminated coil component according to claim 9, characterized in that: The third conductor pattern layer connects the outer conductor line and the inner conductor line on the other end surface side of the element body in the stacking direction.

14. The laminated coil component according to claim 10, characterized in that: The third conductor pattern layer connects the outer conductor line and the inner conductor line on the other end surface side of the element body in the stacking direction.

15. The laminated coil component according to claim 11, characterized in that: The third conductor pattern layer connects the outer conductor line and the inner conductor line on the other end surface side of the element body in the stacking direction.

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