JP6111681B2 - Multilayer coil parts - Google Patents

Description

  The present invention relates to a laminated coil component.

  As a laminated coil component, an element body formed by laminating a plurality of insulator layers, a coil formed by connecting a plurality of internal conductors arranged in the element body, and one of the outer surfaces of the element body A multilayer coil component including a pair of external electrodes arranged on one surface is known (see, for example, Patent Document 1). In the laminated coil component described in Patent Document 1, both ends of the coil are connected to corresponding external electrodes via through-hole conductors.

JP 2011-9391 A

  However, the laminated coil component described in Patent Document 1 may cause the following problems. In the laminated coil component, the pair of external electrodes is disposed on one surface of the outer surface of the element body. For this reason, the connection strength between the element body and the external electrode is inevitably lowered, and the external electrode may peel off from the element body. The laminated coil component described in Patent Document 1 is mounted on an electronic device (for example, a circuit board or an electronic component) with the surface on which the external electrode is disposed as a mounting surface. At this time, an external force acts on the element body (laminated coil component). In particular, when an external force is applied in a direction parallel to the interface between the element body and the external electrode, that is, in a direction parallel to the surface on which the external electrode is disposed, peeling tends to occur at the interface between the element body and the external electrode.

  An object of this invention is to provide the laminated coil component provided with the external electrode which is hard to peel from an element | base_body.

  The laminated coil component according to the present invention is formed by laminating a plurality of insulator layers so as to connect between the first and second main surfaces, which are substantially rectangular shapes facing each other, and the first and second main surfaces. Long side direction of the first and second main surfaces so as to connect between the first and second main surfaces and the first and second side surfaces extending in the short side direction of the first and second main surfaces and facing each other And a coil configured by connecting a plurality of internal conductors disposed in the element body to each other, and disposed on the first main surface. A first external electrode and a second external electrode; and a first through-hole conductor having one end connected to one end of the coil and the other end connected to the first external electrode; A second through hole having one end connected to the other end of the coil and the other end connected to the second external electrode. And at least one third through-hole conductor disposed in the element body and having one end connected to the first external electrode and at least one first element disposed in the element body and connected to the second external electrode. And four through-hole conductors.

  In the laminated coil component according to the present invention, not only the first through-hole conductor but also the third through-hole conductor is connected to the first external electrode. Since the third through-hole conductor functions as an anchor together with the first through-hole conductor, the connection strength between the element body and the first external electrode is increased. Not only the second through-hole conductor but also the fourth through-hole conductor is connected to the second external electrode. Since the fourth through-hole conductor functions as an anchor together with the second through-hole conductor, the connection strength between the element body and the second external electrode is increased. As a result, even when an external force is applied from a direction parallel to the interface between the element body and the first and second external electrodes, the first and second external electrodes are difficult to peel from the element body.

  A plurality of the third through-hole conductors and a plurality of the fourth through-hole conductors may be provided. In this case, since the plurality of third through-hole conductors function as anchors, the connection strength between the element body and the first external electrode is further increased, and the plurality of fourth through-hole conductors function as anchors. The connection strength between the second external electrode and the second external electrode is further increased. Therefore, the first and second external electrodes are more difficult to peel from the element body.

  When the center axis of the first through-hole conductor is the origin in a two-dimensional Cartesian coordinate system consisting of the first axis extending in the long side direction of the first main surface and the second axis moving in the short side direction of the first main surface In addition, when at least one central axis of the plurality of third through-hole conductors is located away from the first axis and the second axis, and the central axis of the second through-hole conductor is the origin in the two-dimensional orthogonal coordinate system. In addition, at least one central axis of the plurality of fourth through-hole conductors may be located away from the first axis and the second axis. In this case, the first through-hole conductor and the plurality of third through-hole conductors are arranged in a wide range with respect to the first external electrode when viewed from the stacking direction. Therefore, the connection strength between the element body and the first external electrode is further increased. The second through-hole conductor and the plurality of fourth through-hole conductors are dispersed in a wide range with respect to the second external electrode when viewed from the stacking direction. Therefore, the connection strength between the element body and the second external electrode is further increased. As a result, the first and second external electrodes are more difficult to peel from the element body.

  ADVANTAGE OF THE INVENTION According to this invention, the laminated coil component provided with the external electrode which is hard to peel from an element | base_body can be provided.

It is a perspective view which shows the multilayer coil component which concerns on 1st Embodiment. It is a disassembled perspective view which shows the structure of the element body with which the multilayer coil component which concerns on 1st Embodiment is provided. It is a figure for demonstrating the cross-sectional structure of the laminated coil component which concerns on 1st Embodiment. It is a top view of the laminated coil which concerns on 1st Embodiment. It is a disassembled perspective view which shows the structure of the element | base_body with which the laminated coil component which concerns on 2nd Embodiment is provided. It is a figure for demonstrating the cross-sectional structure of the laminated coil component which concerns on 2nd Embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

[First Embodiment]
First, with reference to FIGS. 1-4, the structure of the laminated coil component C1 which concerns on 1st Embodiment is demonstrated. FIG. 1 is a perspective view showing the multilayer coil component according to the first embodiment. FIG. 2 is an exploded perspective view showing a configuration of an element body included in the multilayer coil component according to the first embodiment. FIG. 3 is a view for explaining a cross-sectional configuration of the multilayer coil component according to the first embodiment. FIG. 4 is a plan view of the multilayer coil according to the first embodiment.

  As shown in FIG. 1, the laminated coil component C <b> 1 includes an element body 1 that has a substantially rectangular parallelepiped shape, and a first external electrode 2 and a second external electrode 4 that are disposed on the outer surface of the element body 1. Yes.

  The element body 1 has, as outer surfaces thereof, substantially rectangular first and second main surfaces 1a, 1b facing each other, first and second side surfaces 1c, 1d facing each other, and third and second surfaces facing each other. It has four side surfaces 1e and 1f. The first and second side surfaces 1c, 1d extend in the short side direction of the first and second main surfaces 1a, 1b so as to connect the first and second main surfaces 1a, 1b. The third and fourth side surfaces 1e and 1f extend in the long side direction of the first and second main surfaces 1a and 1b so as to connect the first and second main surfaces 1a and 1b.

  As shown in FIG. 2, the element body 1 is formed by laminating a plurality of insulator layers 11. Each insulator layer 11 has a substantially rectangular shape. Each insulator layer 11 is an insulator having electrical insulating properties, and is composed of a sintered body of an insulator green sheet. In the actual element body 1, the insulating layers 11 are integrated to such an extent that the boundary between them cannot be visually recognized.

  The insulator layer 11 is made of, for example, glass made of strontium, calcium, alumina and silicon oxide, and glass-based ceramic made of alumina. The insulator layer 11 may be made of ferrite (Ni—Cu—Zn ferrite, Ni—Cu—Zn—Mg ferrite, Cu—Zn ferrite, Ni—Cu ferrite, etc.), and a part thereof The insulator layer 11 may be made of nonmagnetic ferrite.

  The first external electrode 2 and the second external electrode 4 are disposed on the first main surface 1a. The first external electrode 2 is disposed near the end of the first main surface 1a on the first side surface 1c side, that is, near one short side of the first main surface 1a. The second external electrode 4 is disposed near the end of the first main surface 1a on the second side 1d side, that is, near the other short side of the first main surface 1a. The first external electrode 2 and the second external electrode 4 are located apart from each other in the long side direction of the first main surface 1a.

  The first and second external electrodes 2 and 4 have a substantially rectangular shape in plan view (in the present embodiment, a substantially rectangular shape in which the long side direction of the first main surface 1a is the long side direction). Is rounded. The first and second external electrodes 2 and 4 include a conductive material (for example, Ag or Pd) and a glass component. The first and second external electrodes 2 and 4 are configured as a sintered body of a conductive paste containing conductive metal powder (for example, Ag powder or Pd powder) and glass frit. The sintered bodies constituting the first and second external electrodes 2 and 4 are electroplated, and a plating layer is formed on the surfaces of the first and second external electrodes 2 and 4. Ni, Sn, etc. are used for electroplating.

  As shown in FIGS. 2 and 3, the multilayer coil component C <b> 1 includes a plurality of inner conductors 21, 22, 23, and 24 and a plurality of lead conductors 25 and 26 in the element body 1. Each conductor 21-26 is comprised as a sintered compact of the electrically conductive paste containing the said electrically-conductive material (for example, Ag powder, Pd powder, etc.).

  The plurality of inner conductors 21 to 24 and the plurality of lead conductors 25 and 26 are juxtaposed in the stacking direction of the insulator layer 11 (hereinafter simply referred to as “stacking direction”). End portions of the plurality of inner conductors 21 to 24 are connected by a through-hole conductor 36. The ends of the plurality of internal conductors 21 to 24 are connected to each other through the through-hole conductor 36, whereby the coil 20 is configured in the element body 1. That is, the laminated coil component C <b> 1 includes the coil 20 in the element body 1.

  The plurality of lead conductors 25 are disposed between the first external electrode 2 and the one end E1 of the coil 20, and are connected to each other through the through conductor portion 30a. One end E1 of the coil 20 and the lead conductor 25 adjacent to the one end E1 in the stacking direction are connected by a through conductor portion 30a. The first external electrode 2 and the lead conductor 25 adjacent to the first external electrode 2 in the stacking direction are also connected by the through conductor portion 30a. Therefore, one end E1 of the coil 20 is connected to the first external electrode 2 through the plurality of through conductor portions 30a.

  In the present embodiment, the multilayer coil component C1 includes a plurality of through conductor portions 30a as described above, and one end of the plurality of through conductor portions 30a is connected to the one end E1 of the coil 20 and the other end. Constitutes a first through-hole conductor 30 connected to the first external electrode 2. That is, the laminated coil component C <b> 1 includes the first through-hole conductor 30.

  The plurality of lead conductors 26 are disposed between the second external electrode 4 and the other end E2 of the coil 20, and are connected to each other through the through conductor portion 31a. The other end E2 of the coil 20 and the lead conductor 26 adjacent to the other end E2 in the stacking direction are connected by a through conductor portion 31a. The second external electrode 4 and the lead conductor 26 adjacent to the second external electrode 4 in the stacking direction are also connected by the through conductor portion 31a. Therefore, the other end E2 of the coil 20 is connected to the second external electrode 4 through the plurality of through conductor portions 31a.

  In the present embodiment, the multilayer coil component C1 includes the plurality of through conductor portions 31a as described above, and one end of each of the plurality of through conductor portions 31a is connected to the other end portion E2 of the coil 20 and the other. A second through-hole conductor 31 whose end is connected to the second external electrode 4 is formed. That is, the laminated coil component C <b> 1 includes the second through-hole conductor 31.

  The laminated coil component C1 includes a plurality of third through-hole conductors (in this embodiment, two third through-hole conductors) 32 and 33 and a plurality of fourth through-hole conductors (in this embodiment, two fourth through-hole conductors). Hall conductors) 34, 35.

  One end of each third through-hole conductor 32, 33 is connected to the first external electrode 2. Not only the first through-hole conductor 30 but also two third through-hole conductors 32 and 33 are connected to the first external electrode 2. The other ends of the third through-hole conductors 32 and 33 are located in the element body 1 with no conductors connected thereto.

  One end of each fourth through-hole conductor 34, 35 is connected to the second external electrode 4. In addition to the second through-hole conductor 31, two fourth through-hole conductors 34 and 35 are connected to the second external electrode 4. The other ends of the third through-hole conductors 34 and 35 are located in the element body 1 with no conductors connected thereto.

  Each through-hole conductor 30, 31, 32, 33, 34, 35, 36 (each through-conductor portion 30a, 31a) is made of the above-mentioned conductive material (for example, Ag powder or Pd powder) in the same manner as each conductor 21-26. It is comprised as a sintered compact of the conductive paste containing.

  4, the positional relationship between the first through-hole conductor 30 and the two third through-hole conductors 32 and 33, and the second through-hole conductor 31 and the two fourth through-hole conductors 34 and 35. The positional relationship with will be described. For the description, a two-dimensional orthogonal coordinate system including a first axis X extending in the long side direction of the first main surface 1a and a second axis Y moving in the short side direction of the first main surface 1a is introduced.

  As shown in FIG. 4, one end of the first through-hole conductor 30 (through conductor portion 30 a) and the third through-hole conductors 32 and 33 are exposed in a region of the first main surface 1 a on the first side surface 1 c side. Are arranged as follows. The first through-hole conductor 30, the third through-hole conductor 32, and the third through-hole conductor 33 are arranged in the element body 1 in the direction from the third side face 1e side to the fourth side face 1f side. 30, the third through-hole conductor 32, and the third through-hole conductor 33 are arranged in this order.

  In a two-dimensional orthogonal coordinate system composed of the first axis X and the second axis Y, when the central axis O1 of the first through-hole conductor 30 is the origin, the central axis O3 of the third through-hole conductor 33 is the first axis X Located on the top. On the other hand, the central axis O2 of the third through-hole conductor 32 is located away from the first axis X and the second axis Y. That is, the central axis of the through-hole conductor located closest to the third side face 1e (the central axis O1 of the first through-hole conductor 30) and the central axis of the through-hole conductor located closest to the fourth side face 1f (third through-hole) The central axis of the through-hole conductor located between the through-hole conductor located closest to the third side face 1e and the through-hole conductor located closest to the fourth side face 1f from the straight line connecting the central axis O3) of the conductor 33 (The central axis O2 of the third through-hole conductor 32) is located away. The first through-hole conductor 30, the third through-hole conductor 32, and the third through-hole conductor 33 are arranged in a staggered manner.

  The second through-hole conductor 31 (through-conductor portion 31a) and the fourth through-hole conductors 34 and 35 are arranged so that one ends thereof are exposed in the region on the second side surface 1d side of the first main surface 1a. The second through-hole conductor 31, the fourth through-hole conductor 34, and the fourth through-hole conductor 35 are arranged in the element body 1 in the direction from the third side surface 1e side to the fourth side surface 1f side. 31, the fourth through-hole conductor 34, and the fourth through-hole conductor 35 are arranged in this order.

  In the two-dimensional orthogonal coordinate system composed of the first axis X and the second axis Y, when the central axis O4 of the second through-hole conductor 31 is the origin, the central axis O6 of the fourth through-hole conductor 35 is the first axis X. Located on the top. On the other hand, the central axis O5 of the fourth through-hole conductor 34 is located away from the first axis X and the second axis Y. That is, the central axis of the through-hole conductor positioned closest to the third side surface 1e (the central axis O4 of the second through-hole conductor 31) and the central axis of the through-hole conductor positioned closest to the fourth side surface 1f (fourth through-hole) The central axis of the through-hole conductor located between the through-hole conductor located closest to the third side surface 1e and the through-hole conductor located closest to the fourth side surface 1f from the straight line connecting the central axis O6) of the conductor 35 (The central axis O5 of the fourth through-hole conductor 34) is located away. The second through-hole conductor 31, the fourth through-hole conductor 34, and the fourth through-hole conductor 35 are arranged in a staggered manner.

  As described above, in the present embodiment, not only the first through-hole conductor 30 but also the two third through-hole conductors 32 and 33 are connected to the first external electrode 2. Since the two third through-hole conductors 32 and 33 function as anchors together with the first through-hole conductor 30, the connection strength between the element body 1 and the first external electrode 2 is increased. In addition to the second through-hole conductor 31, two fourth through-hole conductors 34 and 35 are connected to the second external electrode 4. Since the two fourth through-hole conductors 34 and 35 function as an anchor together with the second through-hole conductor 31, the connection strength between the element body 1 and the second external electrode 4 is increased. As a result, even when an external force is applied from a direction parallel to the interface between the element body 1 and the first and second external electrodes 2, 4, the first and second external electrodes 2, 4 are separated from the element body 1. Can be difficult.

  In the present embodiment, in the two-dimensional orthogonal coordinate system composed of the first axis X and the second axis Y, when the central axis O1 of the first through-hole conductor 30 is the origin, the two third through-hole conductors 32, One central axis O <b> 2 of 33 is located away from the first axis X and the second axis Y. In the two-dimensional orthogonal coordinate system, when the central axis O4 of the second through-hole conductor 31 is the origin, one central axis O5 of the two fourth through-hole conductors 34 and 35 is the first axis X and the second axis. Located away from the axis Y. For this reason, the first through-hole conductor 30 and the two third through-hole conductors 32 and 33 are distributed over a wide range with respect to the first external electrode 2 when viewed from the stacking direction. The second through-hole conductor 31 and the two fourth through-hole conductors 34 and 35 are arranged in a wide range with respect to the second external electrode 4 when viewed from the stacking direction. Therefore, the connection strength between the element body 1 and the first external electrode 2 and the connection strength between the element body 1 and the second external electrode 4 are further increased. As a result, the first and second external electrodes 2 and 4 can be made more difficult to peel from the element body 1.

[Second Embodiment]
Next, the configuration of the laminated coil component C2 according to the second embodiment will be described with reference to FIGS. FIG. 5 is an exploded perspective view showing a configuration of an element body included in the multilayer coil component according to the second embodiment. FIG. 6 is a view for explaining a cross-sectional configuration of the multilayer coil component according to the second embodiment.

  Similarly to the first embodiment, the laminated coil component C2 according to the second embodiment includes the element body 1, the first external electrode 2, and the second external electrode 4. As shown in FIGS. 5 and 6, the laminated coil component C <b> 2 according to the second embodiment includes the first intermediate electrode 6 and the first intermediate electrode 6 in addition to the conductors 21 to 26 and 30 to 36 similar to those of the first embodiment. Two intermediate electrodes 8 are further provided in the element body 1. In the present embodiment, there is one lead conductor 26.

  The first and second intermediate electrodes 6 and 8 have a substantially rectangular shape in plan view (in the present embodiment, a substantially rectangular shape in which the long side direction of the first main surface 1a is the long side direction). Is rounded. The 1st and 2nd intermediate electrodes 6 and 8 are comprised as a sintered body of the electrically conductive paste containing the said electrically-conductive material (for example, Ag powder or Pd powder etc.) similarly to each conductor 21-26.

  The first intermediate electrode 6 is disposed between the first outer electrode 2 and the lead conductor 25 closest to the first major surface 1a among the plurality of lead conductors 25. That is, the first intermediate electrode 6 is positioned adjacent to the first external electrode 2 in the stacking direction. The second intermediate electrode 8 is disposed between the second external electrode 4 and the lead conductor 26 closest to the first major surface 1a among the plurality of lead conductors 26. That is, the second intermediate electrode 8 is located adjacent to the second external electrode 4 in the stacking direction.

  The first intermediate electrode 6 is connected to the first external electrode 2 through the through conductor portion 30a and the two third through-hole conductors 32 and 33, and the plurality of lead conductors 25 are connected through the through conductor portion 30a. Of these, the lead conductor 25 closest to the first main surface 1a is connected. Of the through conductor portions 30 a constituting the first through-hole conductor 30, one end of the through conductor portion 30 a located closest to the first main surface 1 a of the element body 1 is connected to the first intermediate electrode 6. . Therefore, the first through-hole conductor 30 is connected to the first intermediate electrode 6 in the middle part thereof. The other ends of the third through-hole conductors 32 and 33 are connected to the first intermediate electrode 6.

  The second intermediate electrode 8 is connected to the second external electrode 4 through the through conductor portion 31a and the two fourth through-hole conductors 34 and 35, and the plurality of lead conductors 26 are connected through the through conductor portion 31a. Of these, the lead conductor 26 closest to the first main surface 1a is connected. Of the through conductor portions 31 a constituting the second through-hole conductor 31, one end of the through conductor portion 31 a located closest to the first main surface 1 a of the element body 1 is connected to the second intermediate electrode 8. . Therefore, the second through-hole conductor 31 is connected to the second intermediate electrode 8 in the middle part thereof. The other ends of the fourth through-hole conductors 34 and 35 are connected to the second intermediate electrode 8.

  As described above, also in this embodiment, in addition to the conventional first and second through-hole conductors 30 and 31, two third through-hole conductors 32 and 33 are connected to the first external electrode 2, and two fourth through-holes are connected. The conductors 34 and 35 are connected to the second external electrode 4. The two third through-hole conductors 32 and 33 and the two fourth through-hole conductors 34 and 35 together with the first and second through-hole conductors 30 and 31 function as anchors. The connection strength with the two external electrodes 2 and 4 increases. Therefore, even when an external force is applied from a direction parallel to the interface between the element body 1 and the first and second external electrodes 2, 4, the first and second external electrodes 2, 4 are difficult to peel from the element body 1. Can be.

  According to this embodiment, the first through-hole conductor 30 and the two third through-hole conductors 32 and 33 are connected not only to the first external electrode 2 but also to the first intermediate electrode 6. The second through-hole conductor 31 and the two fourth through-hole conductors 34 and 35 are connected not only to the second external electrode 4 but also to the second intermediate electrode 8. For this reason, the connection strength between the element body 1 and the first and second external electrodes 2 and 4 is further increased. As a result, the first and second external electrodes 2 and 4 can be made more difficult to peel from the element body 1.

  The preferred embodiments of the present invention have been described above. However, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  The number of each through-hole conductor 30-36 is not restricted to the number mentioned above. For example, a plurality of first or second through-hole conductors 30 and 31 may be provided. The third or fourth through-hole conductors 32 to 35 may be provided one by one, or three or more.

  The number of laminations of the insulator layer 11, the number of laminations of the internal conductors 21 to 24, the number of laminations of the lead conductors 25 and 26, and the number of laminations of the first and second intermediate electrodes 6 and 8 are the number of laminations in the above-described embodiment. Not limited. The shapes of the inner conductors 21 to 24, the lead conductors 25 and 26, and the first and second intermediate electrodes 6 and 8 are not limited to the shapes in the above-described embodiments.

  The 1st through-hole conductor 30, the 3rd through-hole conductor 32, and the 3rd through-hole conductor 33 may be arrange | positioned so that each center axis O1, O2, O3 may be located on the same straight line. The 2nd through-hole conductor 31, the 4th through-hole conductor 34, and the 4th through-hole conductor 35 may be arrange | positioned so that each center axis | shaft O3, O4, O5 may be located on the same straight line.

  C1 ... laminated coil component, 1 ... element body, 1a ... first main surface, 1b ... second main surface, 1c ... first side surface, 1d ... second side surface, 1e ... third side surface, 1f ... fourth side surface, 2 ... 1st external electrode, 4 ... 2nd external electrode, 11 ... Insulator layer, 20 ... Coil, 21-24 ... Internal conductor, 30 ... First through-hole conductor, 31 ... Second through-hole conductor, 32, 33 ... Third through-hole conductor, 34, 35... Fourth through-hole conductor.

Claims (3)

A plurality of insulator layers are stacked, and the first and second main surfaces are short so as to connect between the first and second main surfaces, which are substantially rectangular, facing each other, and the first and second main surfaces. The first and second side surfaces extending in the side direction and facing each other, and the third and second surfaces extending and facing in the long side direction of the first and second main surfaces so as to connect the first and second main surfaces. possess the four sides, a and a body is a sintered body,
A coil that is arranged in the element body and is configured by connecting a plurality of internal conductors that are sintered bodies to each other;
A first external electrode and a second external electrode, which are disposed only on the first main surface and are sintered bodies ;
A first through-hole conductor disposed in the element body and being a sintered body, having one end connected to one end of the coil and the other end connected to the first external electrode;
A second through-hole conductor disposed in the element body and being a sintered body, having one end connected to the other end of the coil and the other end connected to the second external electrode;
At least one third through-hole conductor disposed in the element body and being a sintered body, one end of which is connected to the first external electrode;
At least one fourth through-hole conductor disposed in the element body and being a sintered body, one end of which is connected to the second external electrode;
A laminated coil component comprising:   The multilayer coil component according to claim 1, comprising a plurality of the third through-hole conductors and a plurality of the fourth through-hole conductors. The center axis of the first through-hole conductor in a two-dimensional orthogonal coordinate system comprising a first axis of the first main surface in the long side direction and a second axis of the first main surface in the short side direction Is the origin, at least one central axis of the plurality of third through-hole conductors is located away from the first axis and the second axis,
In the two-dimensional orthogonal coordinate system, when the central axis of the second through-hole conductor is the origin, at least one central axis of the plurality of fourth through-hole conductors is from the first axis and the second axis. The laminated coil component according to claim 2, wherein the laminated coil component is located apart.

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