Multilayer coil parts

Abstract

To provide a laminated coil component that suppresses the generation of stray capacitance and improves characteristics.SOLUTION: A laminated coil component 1 includes an element body 2, a coil 5, a first terminal electrode 3 and a second terminal electrode 4, a first connection conductor 6, and a second connecting conductor 7. The coil 5 includes a first coil portion 8 having one end of the coil 5 and arranged on the main surface 2c side, and a second coil portion 9 having the other end of the coil 5 and arranged on the main surface 2d side, and a distance L2 between the first connection conductor 6 and the second coil portion 9 is greater than a distance L1 between the first connection conductor 6 and the first coil portion 8.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a laminated coil component. [Background technology]

[0002] Known conventional laminated coil components include, for example, the one described in Patent Document 1. The laminated coil component described in Patent Document 1 includes a laminate in which a plurality of units are laminated, and each unit has a first main surface and a second main surface, in which a groove is formed in the first main surface with a depth of at least one layer of the base material layer, and in at least one unit, a hole is formed in the bottom of the groove and reaches the second main surface, and the groove and the hole are each filled with a conductor, and by stacking the multiple units, the conductor filled in the hole of one adjacent unit is connected to the conductor filled in the groove of the other adjacent unit, and inside the laminate, the conductor is connected in a spiral shape with the stacking direction of the units as an axis. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-16642 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a multilayer coil component, it is desirable to increase the coil diameter in order to improve the characteristics. However, in a configuration in which a connecting conductor is disposed inside an element body, increasing the coil diameter shortens the distance between the connecting conductor and the coil. This can increase the stray capacitance (parasitic capacitance) formed by the coil and the connecting conductor. If the stray capacitance generated between the coil and the connecting conductor increases, the self-resonant frequency (SRF) and the quality factor (Q) value of the coil become lower.

[0005] An object of one aspect of the present invention is to provide a laminated coil component that can suppress the occurrence of stray capacitance and improve characteristics. [Means for solving the problem]

[0006] a first connecting conductor that is arranged outside the coil when viewed from the opposing direction within the element body, extending in the opposing direction and connecting one end of the coil located on the other main surface side to the first terminal electrode, and a second connecting conductor that connects the other end of the coil located on the one main surface side to the second terminal electrode, the coil including a first coil portion having one end of the coil and arranged on the other main surface side, and a second coil portion having the other end of the coil and arranged on the one main surface side,

[0007] In the laminated coil component, the potential difference between the first terminal electrode and the second terminal electrode is maximized. When conductors having a large potential difference face each other, a stray capacitance is formed. In the laminated coil component, the first connecting conductor connected to the first terminal electrode extends along the facing direction. In this configuration, a stray capacitance is formed between the first connecting conductor and the coil due to a potential difference between the first connecting conductor and the coil. In particular, a stray capacitance is easily formed between the coil connected to the second terminal electrode side and the first connecting conductor. Therefore, in the laminated coil component, the shortest distance between the first connecting conductor and the second coil portion is made larger than the shortest distance between the first connecting conductor and the first coil portion. As a result, in the laminated coil component, the second coil portion having a large potential difference with the first connecting conductor is disposed farther from the first connecting conductor than the first coil portion. Therefore, in the laminated coil component, the stray capacitance formed between the first connecting conductor and the second coil portion can be reduced. Furthermore, in the laminated coil component, the diameter of the first coil portion can be increased. Therefore, the inductance of the coil can be increased. As described above, in the laminated coil component, the generation of stray capacitance is suppressed and characteristics are improved.

[0008] In one embodiment, the first coil portion and the second coil portion may have different diameters, and the outer edges of the first coil portion and the second coil portion may overlap when viewed from the opposing direction. In this configuration, by overlapping the outer edges of the first coil portion and the second coil portion, it is possible to increase the diameter of the second coil portion while ensuring the distance between the first connecting conductor and the second coil.

[0009] In one embodiment, the first terminal electrode and the second coil portion do not need to overlap when viewed from the opposing direction. In this configuration, it is possible to suppress the formation of stray capacitance between the first terminal electrode and the second coil portion.

[0010] In one embodiment, the distance between the first connecting conductor and the coil is set based on the potential difference between the first connecting conductor and the coil during use, and the distance may be longer at a position where the potential difference is large than at a position where the potential difference is smaller. In this configuration, the distance is set according to the potential difference, so that stray capacitance can be reduced. Effect of the Invention

[0011] According to one aspect of the present invention, the occurrence of stray capacitance is suppressed, and characteristics are improved. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a perspective view of a laminated coil component in accordance with a first embodiment. FIG. [Diagram 2] FIG. 2 is a side view of the laminated coil component shown in FIG. [Diagram 3] FIG. 3 is an exploded perspective view of the laminated coil component shown in FIG. [Figure 4] FIG. 4 is a perspective view of the laminated coil component in accordance with the second embodiment. [Diagram 5] FIG. 5 is a side view of the laminated coil component shown in FIG. [Figure 6] FIG. 6 is an exploded perspective view of the laminated coil component shown in FIG. [Figure 7] FIG. 7 is a perspective view of the laminated coil component in accordance with the third embodiment. [Figure 8] FIG. 8 is a side view of the laminated coil component shown in FIG. [Figure 9] FIG. 9 is an exploded perspective view of the laminated coil component shown in FIG. [Figure 10] FIG. 10 is a top view of the laminated coil component shown in FIG. [Figure 11] FIG. 11 is a perspective view of the laminated coil component according to the fourth embodiment. [Figure 12] FIG. 12 is a side view of the laminated coil component shown in FIG. [Figure 13] FIG. 13 is an exploded perspective view of the laminated coil component shown in FIG. [Figure 14] FIG. 14 is a perspective view of the laminated coil component according to the fifth embodiment. [Figure 15] FIG. 15 is a side view of the laminated coil component shown in FIG. [Figure 16] FIG. 16 is an exploded perspective view of the laminated coil component shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements are designated by the same reference numerals, and duplicated explanations will be omitted.

[0014] [First embodiment] The laminated coil component according to the first embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a perspective view of the laminated coil component according to the first embodiment. Fig. 2 is a side view of the laminated coil component shown in Fig. 1. As shown in Figs. 1 and 2, the laminated coil component 1 according to the first embodiment includes an element body 2, a first terminal electrode 3 and a second terminal electrode 4, a coil 5, a first connecting conductor 6 and a second connecting conductor 7. For ease of explanation, the element body 2 is indicated by a dashed line in Figs. 1 and 2.

[0015] The element body 2 has a rectangular parallelepiped shape. The rectangular parallelepiped shape includes a rectangular parallelepiped shape with chamfered corners and ridges, and a rectangular parallelepiped shape with rounded corners and ridges. The element 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 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. In the following, the facing direction of the main faces 2c, 2d is a first direction D1, the facing direction of the end faces 2a, 2b is a second direction D2, and the facing direction of the side faces 2e, 2f is a third direction D3. The first direction D1, the second direction D2, and the third direction D3 are approximately perpendicular to each other.

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

[0017] The principal surface 2d (one of the principal surfaces) is a mounting surface, and is a surface that faces another electronic device (not shown) when the laminated coil component 1 is mounted on the other electronic device (for example, a circuit board or a laminated electronic component). The end surfaces 2a and 2b are surfaces that are continuous with the mounting surface (i.e., the principal surface 2d).

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

[0019] In this embodiment, "equivalent" may mean not only equal but also values ​​including slight differences or manufacturing errors within a preset range. For example, if multiple values ​​are within a range of ±5% of the average value of the multiple values, the multiple values ​​are defined as equivalent.

[0020] The element body 2 is formed by stacking a plurality of element layers (insulator layers) 10a-10k (see FIG. 3) in a first direction D1. That is, the stacking direction of the element body 2 is the first direction D1. A specific stacking configuration will be described later. In the actual element body 2, the plurality of element layers 10a-10k are integrated to such an extent that the boundaries between the layers are not visible. The element layers 10a-10k are made of, for example, a magnetic material (such as a Ni-Cu-Zn ferrite material, a Ni-Cu-Zn-Mg ferrite material, or a Ni-Cu ferrite material). The magnetic material constituting the element layers 10a-10k may include an Fe alloy or the like. The element layers 10a-10k may be made of a non-magnetic material (such as a glass ceramic material or a dielectric material).

[0021] The first terminal electrode 3 and the second terminal electrode 4 are each provided on the element body 2. The first terminal electrode 3 is formed of a first terminal electrode layer 18k (see FIG. 3). The second terminal electrode 4 is formed of a second terminal electrode layer 19k (see FIG. 3). The first terminal electrode 3 and the second terminal electrode 4 are each arranged on the main surface 2d of the element body 2. The first terminal electrode 3 and the second terminal electrode 4 are provided on the element body 2 and spaced apart from each other in the second direction D2. Specifically, the first terminal electrode 3 is arranged on the end face 2a side of the element body 2. The second terminal electrode 4 is arranged on the end face 2b side of the element 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 the longitudinal direction is along the third direction D3 and the lateral direction is along the second direction D2. 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.

[0023] Each of the first terminal electrode 3 and the second terminal electrode 4 may be provided with a plating layer (not shown) containing, for example, Ni, Sn, Au, etc. by electrolytic plating 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 is composed of a plurality of coil conductor layers 12b to 12h (see FIG. 3). The plurality of coil conductor layers 12b to 12h are connected to each other to form the coil 5 within the element body 2. The coil axis of the coil 5 is provided along the first direction D1. The coil conductor layers 12b to 12h are disposed so as to at least partially overlap each other when viewed from the first direction D1. The plurality of coil conductor layers 12b to 12h are made of a conductive material (for example, Ag or Pd). The coil conductor layers 12b to 12h are disposed spaced apart from the end faces 2a, 2b, the main faces 2c, 2d, and the side faces 2e, 2f.

[0025] The coil 5 includes a first coil portion 8 and a second coil portion 9. The first coil portion 8 is composed of a plurality of coil conductor layers 12b to 12d. The first coil portion 8 is arranged on the main surface 2c side of the element body 2. The first coil portion 8 has one end of the coil 5 connected to the first connecting conductor 6. The first coil portion 8 is connected to the first connecting conductor 6. The second coil portion 9 is composed of a plurality of coil conductor layers 12e to 12h. The second coil portion 9 is arranged on the main surface 2d side of the element body 2. The second coil portion 9 has the other end of the coil 5 connected to the second connecting conductor 7. The second coil portion 9 is connected to the second connecting conductor 7.

[0026] The first connecting conductor 6 is disposed within the element body 2. The first connecting conductor 6 connects the first terminal electrode 3 and the coil 5. The first connecting conductor 6 is a through-hole conductor. The first connecting conductor 6 extends in the first direction D1 and is connected to the first terminal electrode 3 and one end of the coil 5. Specifically, an end of the first connecting conductor 6 on the principal surface 2c (the other principal surface) side in the first direction D1 is connected to one end of the coil 5 located on the principal surface 2c side. The first connecting conductor 6 is composed of a plurality of first connecting conductor layers 14c to 14j (see FIG. 3). The first connecting conductor 6 is disposed outside the coil 5 as viewed from the first direction D1. Specifically, the first connecting conductor 6 is disposed at a corner as viewed from the first direction D1. More specifically, the first connecting conductor 6 is disposed at a corner formed by the end face 2a and the side face 2e. The first connecting conductor 6 has a circular cross section (cross section along the second direction D2 and the third direction D3) perpendicular to the extending direction (first direction D1). That is, the first connecting conductor 6 has a cylindrical shape. Examples of the circular shape include a perfect circle and an ellipse.

[0027] The second connecting conductor 7 is disposed in the element body 2. The second connecting conductor 7 connects the second terminal electrode 4 and the coil 5. The second connecting conductor 7 is a through-hole conductor. The second connecting conductor 7 extends in the first direction D1 and is connected to the second terminal electrode 4 and the other end of the coil 5. Specifically, the end of the second connecting conductor 7 on the main surface 2c side in the first direction D1 is connected to the other end of the coil 5 located on the main surface 2d side. The second connecting conductor 7 is composed of a plurality of second connecting conductor layers 16i, 16j (see FIG. 3). The second connecting conductor 7 is disposed at a corner when viewed from the first direction D1. More specifically, the second connecting conductor 7 is disposed at a corner formed by the end face 2b and the side face 2f. That is, the second connecting conductor 7 is disposed diagonally to the first connecting conductor 6. The second connecting conductor 7 has a circular cross section (cross section along the second direction D2 and the third direction D3) perpendicular to the extending direction (first direction D1). That is, the second connecting conductor 7 has a cylindrical shape.

[0028] Fig. 3 is an exploded perspective view of the laminated coil component shown in Fig. 1. As shown in Fig. 3, the laminated coil component 1 includes a plurality of layers La, Lb, Lc, Ld, Le, Lf, Lg, Lh, Li, Lj, and Lk. The laminated coil component 1 is configured, for example, by laminating layers La to Lk in order from the main surface 2c side.

[0029] The layer La is composed of an element layer 10a.

[0030] The layer Lb is formed by combining an element layer 10b and a coil conductor layer 12b. The element layer 10b has a shape corresponding to the coil conductor layer 12b and is provided with a recess Rb into which the coil conductor layer 12b is fitted. The element layer 10b and the coil conductor layer 12b have a complementary relationship with each other.

[0031] The layer Lc is formed by combining an element layer 10c, a coil conductor layer 12c, and a first connecting conductor layer 14c. The element layer 10c has a shape corresponding to the coil conductor layer 12c and the first connecting conductor layer 14c, and is provided with a recess Rc into which the coil conductor layer 12c and the first connecting conductor layer 14c are fitted. The element layer 10c, the coil conductor layer 12c, and the first connecting conductor layer 14c as a whole have a mutually complementary relationship.

[0032] The layer Ld is formed by combining an element layer 10d, a coil conductor layer 12d, and a first connecting conductor layer 14d. The element layer 10d has a shape corresponding to the coil conductor layer 12d and the first connecting conductor layer 14d, and is provided with a recess Rd into which the coil conductor layer 12d and the first connecting conductor layer 14d are fitted. The element layer 10d, the coil conductor layer 12d, and the first connecting conductor layer 14d as a whole have a mutually complementary relationship.

[0033] The layer Le is formed by combining an element layer 10e, a coil conductor layer 12e, and a first connecting conductor layer 14e. The element layer 10e has a shape corresponding to the coil conductor layer 12e and the first connecting conductor layer 14e, and is provided with a recess Re into which the coil conductor layer 12e and the first connecting conductor layer 14e are fitted. The element layer 10e and the entire coil conductor layer 12e and first connecting conductor layer 14e have a complementary relationship with each other.

[0034] The layer Lf is formed by combining an element layer 10f, a coil conductor layer 12f, and a first connecting conductor layer 14f. The element layer 10f has a shape corresponding to the coil conductor layer 12f and the first connecting conductor layer 14f, and is provided with a recess Rf into which the coil conductor layer 12f and the first connecting conductor layer 14f are fitted. The element layer 10f, the coil conductor layer 12f, and the first connecting conductor layer 14f as a whole have a mutually complementary relationship.

[0035] The layer Lg is formed by combining an element layer 10g, a coil conductor layer 12g, and a first connecting conductor layer 14g. The element layer 10g has a shape corresponding to the coil conductor layer 12g and the first connecting conductor layer 14g, and is provided with a recess Rg into which the coil conductor layer 12g and the first connecting conductor layer 14g are fitted. The element layer 10g, the coil conductor layer 12g, and the first connecting conductor layer 14g as a whole have a mutually complementary relationship.

[0036] The layer Lh is formed by combining an element layer 10h, a coil conductor layer 12h, and a first connecting conductor layer 14h. The element layer 10h has a shape corresponding to the coil conductor layer 12h and the first connecting conductor layer 14h, and is provided with a recess Rh into which the coil conductor layer 12h and the first connecting conductor layer 14h are fitted. The element layer 10h and the entire coil conductor layer 12h and first connecting conductor layer 14h have a mutually complementary relationship.

[0037] The layer Li is formed by combining an element body layer 10i, a first connecting conductor layer 14i, and a second connecting conductor layer 16i with each other. The element body layer 10i has a shape corresponding to the first connecting conductor layer 14i and the second connecting conductor layer 16i, and is provided with a recess Ri into which the first connecting conductor layer 14i and the second connecting conductor layer 16i are fitted. The element body layer 10i and the entire first connecting conductor layer 14i and second connecting conductor layer 16i have a mutually complementary relationship.

[0038] The layer Lj is formed by combining an element body layer 10j, a first connecting conductor layer 14j, and a second connecting conductor layer 16j. The element body layer 10j has a shape corresponding to the first connecting conductor layer 14j and the second connecting conductor layer 16j, and is provided with a recess Rj into which the first connecting conductor layer 14j and the second connecting conductor layer 16j are fitted. The element body layer 10j and the entire first connecting conductor layer 14j and the second connecting conductor layer 16j have a mutually complementary relationship.

[0039] The layer Lk is formed by combining an element layer 10k, a first terminal electrode layer 18k, and a second terminal electrode layer 19k. The element layer 10k has a shape corresponding to the first terminal electrode layer 18k and the second terminal electrode layer 19k, and is provided with a recess Rk into which the first terminal electrode layer 18k and the second terminal electrode layer 19k are fitted. The element layer 10k and the entire first terminal electrode layer 18k and second terminal electrode layer 19k have a mutually complementary relationship.

[0040] The widths of the defective portions Rb to Rk (hereinafter referred to as the widths of the defective portions) are basically set to be wider than the widths of the coil conductor layers 12b to 12h, the first connection conductor layers 14c to 14j, the second connection conductor layers 16i and 16j, the first terminal electrode layer 18k, and the second terminal electrode layer 19k (hereinafter referred to as the widths of the conductor portions). In order to improve the adhesion between the base body layers 10b to 10k and the coil conductor layers 12b to 12h, the first connection conductor layers 14c to 14j, the second connection conductor layers 16i and 16j, the first terminal electrode layer 18k, and the second terminal electrode layer 19k, the widths of the defective portions may be set to be deliberately narrower than the widths of the conductor portions. The value obtained by subtracting the width of the conductor portion from the width of the defective portion is preferably, for example, -3 μm or more and 10 μm or less, and more preferably 0 μm or more and 10 μm or less.

[0041] As shown in FIG. 2, in the multilayer coil component 1, the distance L2 between the first connection conductor 6 and the second coil portion 9 is larger than the distance L1 between the first connection conductor 6 and the first coil portion 8 (L2 > L1). In other words, the distance L1 between the first connection conductor 6 and the first coil portion 8 is smaller than the distance L2 between the first connection conductor 6 and the second coil portion 9 (L1 < L2). That is, the second coil portion 9 is arranged at a distance from the first connection conductor 6 that is greater than that of the first coil portion 8. The distance L1 is the shortest distance between the first connection conductor 6 and the first coil portion 8 (coil conductor layers 12b to 12d). The distance L2 is the shortest distance between the first connection conductor 6 and the second coil portion 9 (coil conductor layers 12e to 12h). Note that in FIG. 2, the distances L1 and L2 are shown for convenience as an example and may differ from the actual shortest distances.

[0042] The first coil portion 8 and the second coil portion 9 have different diameters. The diameter of the first coil portion 8 is larger than the diameter of the second coil portion 9. In other words, the diameter of the second coil portion 9 is smaller than the diameter of the first coil portion 8. The coil axis of the first coil portion 8 and the coil axis of the second coil portion 9 do not coincide. The coil axis of the second coil portion 9 is located closer to the end face 2b than the coil axis of the first coil portion 8. The edges of the first coil portion 8 and the second coil portion 9 on the end face 2b side of the element body 2 coincide in the first direction D1. Specifically, as viewed from the first direction D1, a part of the coil conductor layer 12b constituting the first coil portion 8 overlaps with parts of the coil conductor layer 12e and the coil conductor layer 12h constituting the second coil portion 9.

[0043] When viewed from the first direction D1, the second coil portion 9 does not overlap the first terminal electrode 3. In other words, the second coil portion 9 is not located above the first terminal electrode 3. Specifically, when viewed from the first direction D1, the coil conductor layers 12e to 12h do not overlap the first terminal electrode 3.

[0044] An example of a method for manufacturing the laminated coil component 1 according to the embodiment will be described.

[0045] First, an element forming layer is formed by applying an element paste containing the constituent materials of the element layers 10a-10k and a photosensitive material onto a substrate (e.g., a PET film). The photosensitive material contained in the element paste may be either negative or positive, and a known material may be used. Next, the element forming layer is exposed and developed by a photolithography method using a Cr mask, for example, to form an element pattern on the substrate from which a shape corresponding to the shape of the conductor forming layer described below has been removed. The element pattern is a layer that will become the element layers 10a-10k after heat treatment. That is, an element pattern is formed in which missing parts that will become the missing parts Rb-Rk are provided. Note that the "photolithography method" of this embodiment may be any method that processes a layer to be processed containing a photosensitive material into a desired pattern by exposing and developing it, and is not limited to the type of mask, etc.

[0046] On the other hand, a conductor-forming layer is formed by applying a conductor paste containing the constituent materials of the coil conductor layers 12b-12h, the first connection conductor layers 14c-14j, the second connection conductor layers 16i, 16j, the first terminal electrode layer 18k, and the second terminal electrode layer 19k, and a photosensitive material, onto a substrate (e.g., a PET film). The photosensitive material contained in the conductor paste may be either a negative type or a positive type, and a known material may be used. Next, the conductor-forming layer is exposed and developed by a photolithography method using, for example, a Cr mask, to form a conductor pattern on the substrate. The conductor pattern is a layer that becomes the coil conductor layers 12b-12h, the first connection conductor layers 14c-14j, the second connection conductor layers 16i, 16j, the first terminal electrode layer 18k, and the second terminal electrode layer 19k after heat treatment.

[0047] Next, the element body forming layer is transferred from the substrate onto the support. The element body forming layer is a layer that becomes the layer La after heat treatment.

[0048] Next, the conductor pattern and the element body pattern are repeatedly transferred onto the support, thereby stacking the conductor pattern and the element body pattern in the third direction D3. Specifically, first, the conductor pattern is transferred from the substrate onto the element body formation layer. Next, the element body pattern is transferred from the substrate onto the element body formation layer. The conductor pattern is combined with a missing portion of the element body pattern, and the element body pattern and the conductor pattern form the same layer on the element body formation layer. Furthermore, the transfer process of the conductor pattern and the element body pattern is repeatedly performed, and the conductor pattern and the element body pattern are stacked in a mutually combined state. This stacks layers that will become layers Lb to Lk after heat treatment.

[0049] Next, the element body forming layer is transferred from the substrate onto the layer laminated in the transfer step of the conductor pattern and element body pattern. The element body forming layer is a layer that becomes layer La after heat treatment.

[0050] In this manner, a laminate that constitutes the laminated coil component 1 after the heat treatment is formed on the support. The obtained laminate is then cut to a predetermined size. The cut laminate is then subjected to a binder removal process and then to a heat treatment. The heat treatment temperature is, for example, about 850 to 900° C. If necessary, after the heat treatment, the first terminal electrode 3 and the second terminal electrode 4 may be subjected to electrolytic plating or electroless plating to provide a plating layer.

[0051] In the laminated coil component 1, the potential difference between the first terminal electrode 3 and the second terminal electrode 4 is maximum. When conductors with a large potential difference face each other, a stray capacitance is formed. In the laminated coil component 1, the first connecting conductor 6 connected to the first terminal electrode 3 extends along the first direction D1. In this configuration, a stray capacitance is formed between the first connecting conductor 6 and the coil 5 due to a potential difference between the first connecting conductor 6 and the coil 5. In particular, a stray capacitance is likely to be formed between the coil 5 connected to the second terminal electrode 4 side and the first connecting conductor 6. Therefore, in the laminated coil component 1, the distance L2 between the first connecting conductor 6 and the second coil portion 9 is made larger than the distance L1 between the first connecting conductor 6 and the first coil portion 8. As a result, in the laminated coil component 1, the second coil portion 9 having a large potential difference with the first connecting conductor 6 is disposed farther away from the first connecting conductor 6 than the first coil portion 8. Therefore, in the laminated coil component 1, the stray capacitance formed between the first connecting conductor 6 and the second coil portion 9 can be reduced. In addition, in the laminated coil component 1, the diameter of the first coil portion 8 can be made large. This makes it possible to increase the inductance of the coil 5. As described above, in the laminated coil component 1, the occurrence of stray capacitance is suppressed, and the characteristics are improved.

[0052] In the laminated coil component 1 according to this embodiment, the outer edges of the first coil portion 8 and the second coil portion 9 on the side of the end face 2b of the element body 2 coincide with each other in the first direction D1. With this configuration, it is possible to increase the diameter of the second coil portion 9 while ensuring the distance between the first connecting conductor 6 and the second coil portion 9.

[0053] In the laminated coil component 1 according to the present embodiment, the first terminal electrode 3 and the second coil portion 9 do not overlap when viewed from the first direction D1. With this configuration, it is possible to suppress the generation of stray capacitance between the first terminal electrode 3 and the second coil portion 9.

[0054] [Second embodiment] Next, a laminated coil component according to a second embodiment will be described with reference to Fig. 4 and Fig. 5. Fig. 4 is a perspective view of the laminated coil component according to the second embodiment. Fig. 5 is a side view of the laminated coil component shown in Fig. 4. As shown in Figs. 4 and 5, a laminated coil component 1A according to the second embodiment includes an element body 2, a first terminal electrode 3 and a second terminal electrode 4, a coil 5A, a first connecting conductor 6 and a second connecting conductor 7. For ease of explanation, the element body 2 is indicated by a dashed line in Figs. 4 and 5.

[0055] The element body 2 is formed by stacking a plurality of element body layers 20a to 20k (see FIG. 6) in a first direction D1.

[0056] The coil 5A is disposed within the element body 2. The coil 5A is composed of a plurality of coil conductor layers 22b-22h (see FIG. 6). The plurality of coil conductor layers 22b-22h are connected to each other to form the coil 5A within the element body 2. The coil axis of the coil 5A is provided along the first direction D1. The coil conductor layers 22b-22h are disposed so as to at least partially overlap each other when viewed from the first direction D1. The plurality of coil conductor layers 22b-22h are made of a conductive material (for example, Ag or Pd). The coil conductor layers 22b-22h are disposed spaced apart from the end faces 2a, 2b, the main faces 2c, 2d, and the side faces 2e, 2f.

[0057] The coil 5A includes a first coil portion 8A and a second coil portion 9A. The first coil portion 8A is composed of a plurality of coil conductor layers 22b to 22d. The first coil portion 8A is arranged on the main surface 2c side of the element body 2. The first coil portion 8A has one end of the coil 5A connected to the first connecting conductor 6. The first coil portion 8A is connected to the first connecting conductor 6. The second coil portion 9A is composed of a plurality of coil conductor layers 22e to 22h. The second coil portion 9A is arranged on the main surface 2d side of the element body 2. The second coil portion 9A has the other end of the coil 5A connected to the second connecting conductor 7. The second coil portion 9A is connected to the second connecting conductor 7.

[0058] Fig. 6 is an exploded perspective view of the laminated coil component. As shown in Fig. 6, the laminated coil component 1A includes a plurality of layers LAa, LAb, LAc, LAd, LAe, LAf, LAg, LAh, LAi, LAj, and LAk. The laminated coil component 1A is configured, for example, by laminating the layers LAa to LAk in order from the main surface 2c side.

[0059] The layer LAa is composed of an element layer 20a.

[0060] The layer LAb is formed by combining an element layer 20b and a coil conductor layer 22b with each other. The element layer 20b has a missing portion RAb. The layer LAc is formed by combining an element layer 20c, a coil conductor layer 22c, and a first connecting conductor layer 24c with each other. The element layer 20c has a missing portion RAc.

[0061] The layer LAd is formed by combining an element layer 20d, a coil conductor layer 22d, and a first connecting conductor layer 24d with each other. The element layer 20d has a missing portion RAd. The layer LAe is formed by combining an element layer 20e, a coil conductor layer 22e, and a first connecting conductor layer 24e with each other. The element layer 20e has a missing portion RAe.

[0062] The layer LAf is formed by combining an element layer 20f, a coil conductor layer 22f, and a first connecting conductor layer 24f. The element layer 20f has a missing portion RAf. The layer LAg is formed by combining an element layer 20g, a coil conductor layer 22g, and a first connecting conductor layer 24g. The element layer 20g has a missing portion RAg.

[0063] The layer LAh is formed by combining an element layer 20h, a coil conductor layer 22h, and a first connecting conductor layer 24h with each other. The element layer 20h has a missing portion RAh. The layer LAi is formed by combining an element layer 20i, a first connecting conductor layer 24i, and a second connecting conductor layer 26i with each other. The element layer 20i has a missing portion RAi.

[0064] The layer LAj is formed by combining an element body layer 20j, a first connecting conductor layer 24j, and a second connecting conductor layer 26j with each other. The element body layer 20j has a missing portion RAj. The layer LAk is formed by combining an element body layer 20k, a first terminal electrode layer 28k, and a second terminal electrode layer 29k with each other. The element body layer 20k has a missing portion RAk.

[0065] As shown in FIG. 5, in the laminated coil component 1A, the distance L2 between the first connecting conductor 6 and the second coil portion 9A is greater than the distance L1 between the first connecting conductor 6 and the first coil portion 8A. In other words, the distance L1 between the first connecting conductor 6 and the first coil portion 8A is less than the distance L2 between the first connecting conductor 6 and the second coil portion 9A. That is, the second coil portion 9A is disposed farther away from the first connecting conductor 6 than the first coil portion 8A is. The distance L1 is the shortest distance between the first connecting conductor 6 and the first coil portion 8A (coil conductor layers 22b to 22d). The distance L2 is the shortest distance between the first connecting conductor 6 and the second coil portion 9A (coil conductor layers 22e to 22h). Note that in FIG. 5, the distances L1 and L2 are shown as examples for convenience and may differ from the actual shortest distances.

[0066] In the first coil portion 8A, the distance between the first connecting conductor 6 and the coil conductor layer 22d is greater than the distance between the first connecting conductor 6 and the coil conductor layer 22c. That is, in the path of the first terminal electrode 3, the first connecting conductor 6, the coil 5, the second connecting conductor 7, and the second terminal electrode 4, the coil conductor layer 22d on the second terminal electrode 4 side is disposed farther from the first connecting conductor 6 than the coil conductor layer 22c. In the second coil portion 9A, the distance between the first connecting conductor 6 and the coil conductor layer 22g is greater than the distance between the first connecting conductor 6 and the coil conductor layer 22f. That is, in the above path, the coil conductor layer 22g on the second terminal electrode 4 side is disposed farther from the first connecting conductor 6 than the coil conductor layer 22f.

[0067] In the laminated coil component 1A, the distance between the first connecting conductor 6 and the coil conductor layers 22c, 22d of the first coil portion 8A is set based on the potential difference occurring when the laminated coil component 1A is used. Specifically, in the laminated coil component 1A, the distance between the first connecting conductor 6 and the coil conductor layers 22c, 22d is set such that the greater the potential difference between the first connecting conductor 6 and the coil conductor layer 22c, the greater the distance between the first connecting conductor 6 and the coil conductor layer 22d. The potential difference between the first connecting conductor 6 and the coil conductor layer 22c is greater than the potential difference between the first connecting conductor 6 and the coil conductor layer 22d. As a result, in the laminated coil component 1A, in the first coil portion 8A, the distance between the first connecting conductor 6 and the coil conductor layer 22c increases in this order, followed by the distance between the first connecting conductor 6 and the coil conductor layer 22d. Similarly, in the laminated coil component 1A, in the second coil portion 9A, the distance between the first connecting conductor 6 and the coil conductor layer 22f increases in this order, followed by the distance between the first connecting conductor 6 and the coil conductor layer 22g.

[0068] The first coil portion 8A and the second coil portion 9A have different diameters. The diameter of the first coil portion 8A is larger than the diameter of the second coil portion 9A. In other words, the diameter of the second coil portion 9A is smaller than the diameter of the first coil portion 8A. The coil axis of the first coil portion 8A and the coil axis of the second coil portion 9A do not coincide. The coil axis of the second coil portion 9A is located closer to the end surface 2b than the coil axis of the first coil portion 8A. The edges of the first coil portion 8A and the second coil portion 9A on the end surface 2b side of the element body 2 coincide in the first direction D1. Specifically, as viewed from the first direction D1, a part of the coil conductor layer 22b constituting the first coil portion 8A overlaps with a part of the coil conductor layer 22e and the coil conductor layer 22h constituting the second coil portion 9A.

[0069] When viewed from the first direction D1, the second coil portion 9A does not overlap the first terminal electrode 3. In other words, the second coil portion 9A is not located above the first terminal electrode 3. Specifically, when viewed from the first direction D1, the coil conductor layers 22e to 22h do not overlap the first terminal electrode 3.

[0070] As described above, in the laminated coil component 1A according to the present embodiment, similarly to the laminated coil component 1, the distance L2 between the first connecting conductor 6 and the second coil portion 9A is set to be greater than the distance L1 between the first connecting conductor 6 and the first coil portion 8A. As a result, in the laminated coil component 1A, the second coil portion 9A, which has a larger potential difference with the first connecting conductor 6, is disposed farther away from the first connecting conductor 6 than the first coil portion 8A. Therefore, in the laminated coil component 1A, it is possible to reduce the stray capacitance formed between the first connecting conductor 6 and the second coil portion 9A. Furthermore, in the laminated coil component 1A, it is possible to increase the diameter of the first coil portion 8A. Therefore, it is possible to increase the inductance of the coil 5A. As described above, in the laminated coil component 1A, it is possible to suppress the generation of stray capacitance and improve the characteristics.

[0071] In the laminated coil component 1A according to the present embodiment, the distance between the first connecting conductor 6 and the coil conductor layers 22c, 22d of the first coil portion 8A and the distance between the first connecting conductor 6 and the coil conductor layers 22f, 22g of the second coil portion 9A are set based on the potential difference occurring during use of the laminated coil component 1A. The potential difference between the first connecting conductor 6 and the coil conductor layer 22d is greater than the potential difference between the first connecting conductor 6 and the coil conductor layer 22c. Therefore, in the first coil portion 8A, the distance between the first connecting conductor 6 and the coil conductor layer 22d is greater than the distance between the first connecting conductor 6 and the coil conductor layer 22c. Also, the potential difference between the first connecting conductor 6 and the coil conductor layer 22g is greater than the potential difference between the first connecting conductor 6 and the coil conductor layer 22h. Therefore, in the second coil portion 9A, the distance between the first connecting conductor 6 and the coil conductor layer 22g is greater than the distance between the first connecting conductor 6 and the coil conductor layer 22f. In this configuration, the distance is set according to the potential difference, so that the stray capacitance can be reduced.

[0072] [Third embodiment] Next, a laminated coil component according to a third embodiment will be described with reference to Fig. 7 and Fig. 8. Fig. 7 is a perspective view of the laminated coil component according to the third embodiment. Fig. 8 is a side view of the laminated coil component shown in Fig. 7. As shown in Figs. 7 and 8, a laminated coil component 1B according to the third embodiment includes an element body 2, a first terminal electrode 3 and a second terminal electrode 4, a coil 5B, a first connecting conductor 6 and a second connecting conductor 7. For ease of explanation, the element body 2 is indicated by a dashed line in Figs. 7 and 8.

[0073] The element body 2 is formed by stacking a plurality of element body layers 30a to 30k (see FIG. 9) in a first direction D1.

[0074] The coil 5B is disposed within the element body 2. The coil 5B is composed of a plurality of coil conductor layers 32b to 32h (see FIG. 9). The plurality of coil conductor layers 32b to 32h are connected to each other to form the coil 5B within the element body 2. The coil axis of the coil 5B is provided along the first direction D1. The coil conductor layers 32b to 32h are disposed so as to at least partially overlap each other when viewed from the first direction D1. The plurality of coil conductor layers 32b to 32h are made of a conductive material (for example, Ag or Pd). The coil conductor layers 32b to 32h are disposed spaced apart from the end faces 2a, 2b, the main faces 2c, 2d, and the side faces 2e, 2f.

[0075] The coil 5 includes a first coil portion 8B and a second coil portion 9B. The first coil portion 8B is composed of a plurality of coil conductor layers 32b to 32f. The first coil portion 8B is arranged on the main surface 2c side of the element body 2. The first coil portion 8B has one end of the coil 5B connected to the first connecting conductor 6. The first coil portion 8B is connected to the first connecting conductor 6. The second coil portion 9B is composed of a plurality of coil conductor layers 12g, 12h. The second coil portion 9B is arranged on the main surface 2d side of the element body 2. The second coil portion 9B has the other end of the coil 5B connected to the second connecting conductor 7. The second coil portion 9B is connected to the second connecting conductor 7.

[0076] Fig. 9 is an exploded perspective view of the laminated coil component. As shown in Fig. 9, the laminated coil component 1B includes a plurality of layers LBa, LBb, LBc, LBd, LBe, LBf, LBg, LBh, LBi, LBj, and LBk. The laminated coil component 1B is configured, for example, by laminating layers LBa to LBk in order from the main surface 2c side.

[0077] The layer LBa is composed of an element layer 30a.

[0078] The layer LBb is formed by combining an element layer 30b and a coil conductor layer 32b. The element layer 30b has a missing portion RBb. The layer LBc is formed by combining an element layer 30c, a coil conductor layer 32c, and a first connecting conductor layer 34c. The element layer 30c has a missing portion RBc.

[0079] The layer LBd is formed by combining an element layer 30d, a coil conductor layer 32d, and a first connecting conductor layer 34d with each other. The element layer 30d has a missing portion RBd. The layer LBe is formed by combining an element layer 30e, a coil conductor layer 32e, and a first connecting conductor layer 34e with each other. The element layer 30e has a missing portion RBe.

[0080] The layer LBf is formed by combining an element layer 30f, a coil conductor layer 32f, and a first connecting conductor layer 34f. The element layer 30f has a missing portion RBf. The layer LBg is formed by combining an element layer 30g, a coil conductor layer 32g, and a first connecting conductor layer 34g. The element layer 30g has a missing portion RBg.

[0081] The layer LBh is formed by combining an element layer 30h, a coil conductor layer 32h, and a first connecting conductor layer 34h with each other. The element layer 30h has a missing portion RBh. The layer LBi is formed by combining an element layer 30i, a first connecting conductor layer 34i, and a second connecting conductor layer 36i with each other. The element layer 30i has a missing portion RBi.

[0082] The layer LBj is formed by combining an element layer 30j, a first connecting conductor layer 34j, and a second connecting conductor layer 36j with each other. The element layer 30j has a missing portion RBj. The layer LBk is formed by combining an element layer 30k, a first terminal electrode layer 38k, and a second terminal electrode layer 39k with each other. The element layer 30k has a missing portion RBk.

[0083] As shown in FIG. 10, in the laminated coil component 1B, the distance L2 between the first connecting conductor 6 and the second coil portion 9B is greater than the distance L1 between the first connecting conductor 6 and the first coil portion 8B. In other words, the distance L1 between the first connecting conductor 6 and the first coil portion 8B is smaller than the distance L2 between the first connecting conductor 6 and the second coil portion 9B. That is, the second coil portion 9B is disposed farther away from the first connecting conductor 6 than the first coil portion 8B. In the laminated coil component 1B, in the coil conductor layer 32g constituting the second coil portion 9B, a portion facing the first connecting conductor 6 is set as a hypotenuse. As a result, in the laminated coil component 1B, the distance L2 between the first connecting conductor 6 and the second coil portion 9B is greater than the distance L1 between the first connecting conductor 6 and the first coil portion 8B. The distance L1 is the shortest distance between the first connecting conductor 6 and the first coil portion 8B (coil conductor layers 32b to 32f). Distance L2 is the shortest distance between the first connecting conductor 6 and the second coil portion 9B (coil conductor layers 32g, 32h). Note that in Fig. 10, distances L1 and L2 are shown as examples for the sake of convenience and may differ from the actual shortest distances.

[0084] The first coil portion 8A and the second coil portion 9A have approximately the same diameter. The coil axis of the first coil portion 8B and the coil axis of the second coil portion 9B approximately coincide with each other. When viewed from the first direction D1, a portion of the coil conductor layer 22b constituting the first coil portion 8B overlaps with portions of the coil conductor layers 22e and 22h constituting the second coil portion 9A.

[0085] As described above, in the laminated coil component 1B according to the present embodiment, similarly to the laminated coil component 1, the distance L2 between the first connecting conductor 6 and the second coil portion 9B is set to be greater than the distance L1 between the first connecting conductor 6 and the first coil portion 8B. As a result, in the laminated coil component 1B, the second coil portion 9B, which has a larger potential difference with the first connecting conductor 6, is disposed farther away from the first connecting conductor 6 than the first coil portion 8B. Therefore, in the laminated coil component 1B, it is possible to reduce the stray capacitance formed between the first connecting conductor 6 and the second coil portion 9B. Furthermore, in the laminated coil component 1B, it is possible to increase the diameter of the first coil portion 8B. Therefore, it is possible to increase the inductance of the coil 5B. As described above, in the laminated coil component 1B, it is possible to suppress the generation of stray capacitance and improve the characteristics.

[0086] In the laminated coil component 1B according to the present embodiment, in the coil conductor layer 32g constituting the second coil portion 9B, the portion facing the first connecting conductor 6 is set as the hypotenuse. As a result, in the laminated coil component 1B, the distance L2 between the first connecting conductor 6 and the second coil portion 9B is made larger than the distance L1 between the first connecting conductor 6 and the first coil portion 8B. With this configuration, the diameter of the second coil portion 9B can be made larger. As a result, the characteristics of the laminated coil component 1B can be improved.

[0087] [Fourth embodiment] Next, a laminated coil component according to a fourth embodiment will be described with reference to Fig. 11 and Fig. 12. Fig. 11 is a perspective view of the laminated coil component according to the fourth embodiment. Fig. 12 is a side view of the laminated coil component shown in Fig. 11. As shown in Figs. 11 and 12, a laminated coil component 1C according to the fourth embodiment includes an element body 2, a first terminal electrode 3 and a second terminal electrode 4, a coil 5C, a first connecting conductor 6C and a second connecting conductor 7C. For ease of explanation, the element body 2 is indicated by a dashed line in Figs. 11 and 12.

[0088] The element body 2 is formed by stacking a plurality of element body layers 40a to 40k (see FIG. 13) in a first direction D1.

[0089] The coil 5C is disposed within the element body 2. The coil 5C is composed of a plurality of coil conductor layers 42b-42h (see FIG. 13) and a plurality of through-hole conductors 43a-43h. The plurality of coil conductor layers 42b-42h are connected to each other by the through-hole conductors 43a-43h to form the coil 5C within the element body 2. The coil axis of the coil 5C is provided along the first direction D1. The coil conductor layers 42b-42h are disposed so as to at least partially overlap each other when viewed from the first direction D1. The plurality of coil conductor layers 42b-42h are made of a conductive material (for example, Ag or Pd). The coil conductor layers 42b-42h are disposed spaced apart from the end faces 2a, 2b, the main faces 2c, 2d, and the side faces 2e, 2f.

[0090] The coil 5C includes a first coil portion 8C and a second coil portion 9C. The first coil portion 8C is composed of a plurality of coil conductor layers 42b to 42d. The first coil portion 8C is arranged on the main surface 2c side of the element body 2. The first coil portion 8C has one end of the coil 5C connected to the first connecting conductor 6C. The first coil portion 8C is connected to the first connecting conductor 6C. The second coil portion 9C is composed of a plurality of coil conductor layers 42e to 42h. The second coil portion 9C is arranged on the main surface 2d side of the element body 2. The second coil portion 9C has the other end of the coil 5C connected to the second connecting conductor 7C. The second coil portion 9C is connected to the second connecting conductor 7C.

[0091] The first connecting conductor 6C is disposed within the element body 2. The first connecting conductor 6C connects the first terminal electrode 3 and the coil 5C. The first connecting conductor 6C is a through-hole conductor. The first connecting conductor 6C is composed of a plurality of first through-hole conductor layers 44c to 44j (see FIG. 13).

[0092] The second connecting conductor 7C is disposed within the element body 2. The second connecting conductor 7C connects the second terminal electrode 4 and the coil 5C. The second connecting conductor 7C is a through-hole conductor. The second connecting conductor 7C is composed of a plurality of second through-hole conductor layers 46i, 46j (see FIG. 13).

[0093] Fig. 13 is an exploded perspective view of the laminated coil component. As shown in Fig. 13, the laminated coil component 1C includes a plurality of layers LCa, LCb, LCc, LCd, LCe, LCf, LCg, LCh, LCi, LCj, and LCk. The laminated coil component 1C is configured, for example, by laminating layers LCa to LCk in order from the main surface 2c side.

[0094] The layer LCa is composed of an element layer 40a.

[0095] The layer LCb is configured by providing a coil conductor layer 42b on the base layer 40b. The layer LCc is configured by providing a coil conductor layer 42c on the base layer 40c, and also providing a first through-hole conductor layer 44c. The coil conductor layer 42b and the first through-hole conductor layer 44c are connected by a through-hole conductor 43a. The coil conductor layer 42b and the coil conductor layer 42c are connected by a through-hole conductor 43b.

[0096] The layer LCd is configured by providing a coil conductor layer 42d on a body layer 40d, and also providing a first through-hole conductor layer 44d. The coil conductor layer 42c and the coil conductor layer 42d are connected by a through-hole conductor 43c.

[0097] The layer LCe is configured by providing a coil conductor layer 42e on an element layer 40e, and providing a first through-hole conductor layer 44e on the element layer 40e. The coil conductor layer 42d and the coil conductor layer 42e are connected by a through-hole conductor 43d.

[0098] The layer LCf is configured by providing a coil conductor layer 42f on an element layer 40f, and providing a first through-hole conductor layer 44f on the element layer 40f. The coil conductor layer 42e and the coil conductor layer 42f are connected by a through-hole conductor 43e.

[0099] The layer LCg is configured by providing a coil conductor layer 42g on an element layer 40g, and providing a first through-hole conductor layer 44g on the element layer 40g. The coil conductor layer 42f and the coil conductor layer 42g are connected by a through-hole conductor 43f.

[0100] The layer LCh is configured such that a coil conductor layer 42h is provided on an element layer 40h, and a first through-hole conductor layer 44h is provided on the element layer 40h. The coil conductor layer 42g and the coil conductor layer 42h are connected by a through-hole conductor 43g.

[0101] The layer LCi is configured by providing a first through-hole conductor layer 44i and a second through-hole conductor layer 46i on an element layer 40i. The coil conductor layer 42h and the second through-hole conductor layer 46i are connected by a through-hole conductor 43h.

[0102] The layer LCj is configured by providing a first through-hole conductor layer 44j and a second through-hole conductor layer 46j on an element layer 40j. The layer LCk is configured by providing a first terminal electrode 3 and a second terminal electrode 4 on an element layer 40k.

[0103] As shown in FIG. 12, in the laminated coil component 1C, the distance L2 between the first connecting conductor 6C and the second coil portion 9C is greater than the distance L1 between the first connecting conductor 6C and the first coil portion 8C. In other words, the distance L1 between the first connecting conductor 6C and the first coil portion 8C is less than the distance L2 between the first connecting conductor 6C and the second coil portion 9C. That is, the second coil portion 9C is disposed farther away from the first connecting conductor 6 than the first coil portion 8C. The distance L1 is the shortest distance between the first connecting conductor 6C and the first coil portion 8C (coil conductor layers 42b to 42d). The distance L2 is the shortest distance between the first connecting conductor 6C and the second coil portion 9C (coil conductor layers 42e to 42h). Note that the distances L1 and L2 are shown in FIG. 12 as an example for convenience, and may differ from the actual shortest distances.

[0104] The first coil portion 8C and the second coil portion 9C have different diameters. The diameter of the first coil portion 8C is larger than the diameter of the second coil portion 9C. In other words, the diameter of the second coil portion 9C is smaller than the diameter of the first coil portion 8C. The coil axis of the first coil portion 8C and the coil axis of the second coil portion 9C do not coincide. The coil axis of the second coil portion 9C is located closer to the end surface 2b than the coil axis of the first coil portion 8C. The edges of the first coil portion 8C and the second coil portion 9C on the end surface 2b side of the element body 2 coincide in the first direction D1. Specifically, as viewed from the first direction D1, a part of the coil conductor layer 42b and the coil conductor layer 42d constituting the first coil portion 8C overlaps with a part of the coil conductor layer 42e and the coil conductor layer 42h constituting the second coil portion 9C.

[0105] When viewed from the first direction D1, the second coil portion 9C does not overlap the first terminal electrode 3. That is, the second coil portion 9C is not located above the first terminal electrode 3. Specifically, when viewed from the first direction D1, the coil conductor layers 42e to 42h do not overlap the first terminal electrode 3.

[0106] Next, a method for manufacturing the laminated coil component 1C will be described.

[0107] An insulating resin and a solvent are mixed to prepare a slurry. The prepared slurry is applied to a substrate (e.g., a PET film) by a doctor blade method to form a green sheet that will become the element layers 40a-40k. Next, through holes are formed by laser processing in the green sheet at positions where the through-hole conductors 43a-43h, the first through-hole conductor layers 44b-44j, and the second through-hole conductor layers 46i and 46j are to be formed.

[0108] Next, a first conductive paste is filled into the through holes of the green sheet. The first conductive paste is made by mixing conductive metal powder and binder resin. Next, conductors that will become the coil conductor layers 42b to 42h are provided on the green sheet. At this time, the conductors are connected to the conductive paste in the through holes.

[0109] Next, the green sheets are stacked. Here, the green sheets on which the conductors are provided are peeled off from the substrate, stacked, and pressed in the stacking direction to form a laminate. At this time, the green sheets are stacked so that the conductors that will become the coil conductor layers 42b to 42h overlap in the stacking direction.

[0110] Next, the laminate of the green sheets is cut into chips of a predetermined size by a cutter to obtain green chips. Next, the binder resin contained in each part is removed from the green chip, and the green chip is fired. In this way, the element body 2 is obtained.

[0111] Next, a second conductive paste is applied to the main surface 2d of the element body 2. The second conductive paste is prepared by mixing a conductive metal powder, a glass frit, a binder resin, and the like. Next, the second conductive paste is baked onto the element body 2 by a heat treatment to form the first terminal electrode 3 and the second terminal electrode 4. If necessary, the first terminal electrode 3 and the second terminal electrode 4 may be subjected to electrolytic plating or electroless plating to provide a plating layer. Through the above steps, a laminated coil component 1C is obtained.

[0112] As described above, in the laminated coil component 1C according to the present embodiment, similarly to the laminated coil component 1, the distance L2 between the first connecting conductor 6C and the second coil portion 9C is set to be greater than the distance L1 between the first connecting conductor 6C and the first coil portion 8C. As a result, in the laminated coil component 1C, the second coil portion 9C, which has a larger potential difference with the first connecting conductor 6C, is disposed farther away from the first connecting conductor 6C than the first coil portion 8C. Therefore, in the laminated coil component 1C, it is possible to reduce the stray capacitance formed between the first connecting conductor 6C and the second coil portion 9C. Furthermore, in the laminated coil component 1C, it is possible to increase the diameter of the first coil portion 8C. Therefore, it is possible to increase the inductance of the coil 5C. As described above, in the laminated coil component 1C, it is possible to suppress the generation of stray capacitance and improve the characteristics.

[0113] [Fifth embodiment] Next, a laminated coil component according to a fifth embodiment will be described with reference to Fig. 14 and Fig. 15. Fig. 14 is a perspective view of the laminated coil component according to the fifth embodiment. Fig. 15 is a side view of the laminated coil component shown in Fig. 14. As shown in Figs. 14 and 15, a laminated coil component 1D according to the fifth embodiment includes an element body 2, a first terminal electrode 3 and a second terminal electrode 4, a coil 5D, a first connecting conductor 6D and a second connecting conductor 7D. For ease of explanation, the element body 2 is indicated by a dashed line in Figs. 11 and 12.

[0114] The element body 2 is formed by stacking a plurality of element body layers 50a to 50k (see FIG. 16) in a first direction D1.

[0115] The coil 5D is disposed within the element body 2. The coil 5D is composed of a plurality of coil conductor layers 52b-52h (see FIG. 16) and a plurality of through-hole conductors 53a-53h. The plurality of coil conductor layers 52b-52h are connected to each other by the through-hole conductors 53a-53h to form the coil 5D within the element body 2. The coil axis of the coil 5C is provided along the first direction D1. The coil conductor layers 52b-52h are disposed so as to at least partially overlap each other when viewed from the first direction D1. The plurality of coil conductor layers 52b-52h are made of a conductive material (for example, Ag or Pd). The coil conductor layers 52b-52h are disposed spaced apart from the end faces 2a, 2b, the main faces 2c, 2d, and the side faces 2e, 2f.

[0116] The coil 5D includes a first coil portion 8D, a second coil portion 9D, and a third coil portion 10D. The first coil portion 8D is composed of a plurality of coil conductor layers 52b to 52d. The first coil portion 8D is disposed on the main surface 2c side of the element body 2. The first coil portion 8D has one end of the coil 5D connected to the first connecting conductor 6D. The first coil portion 8D is connected to the first connecting conductor 6D. The second coil portion 9D is composed of a plurality of coil conductor layers 52g, 52h. The second coil portion 9D is disposed on the main surface 2d side of the element body 2. The second coil portion 9D has the other end of the coil 5D connected to the second connecting conductor 7D. The second coil portion 9D is connected to the second connecting conductor 7D. The third coil portion 10D is composed of a plurality of coil conductor layers 52e, 52f. The third coil portion 10D is disposed between the first coil portion 8D and the second coil portion 9D. One end of the third coil portion 10D is connected to the first coil portion 8D, and the other end of the third coil portion 10D is connected to the second coil portion 9D.

[0117] The first connecting conductor 6D is disposed within the element body 2. The first connecting conductor 6D connects the first terminal electrode 3 and the coil 5D. The first connecting conductor 6D is a through-hole conductor. The first connecting conductor 6D is composed of a plurality of first through-hole conductor layers 54c to 54j (see FIG. 16).

[0118] The second connecting conductor 7D is disposed within the element body 2. The second connecting conductor 7D connects the second terminal electrode 4 and the coil 5D. The second connecting conductor 7D is a through-hole conductor. The second connecting conductor 7D is composed of a plurality of second through-hole conductor layers 56i, 56j (see FIG. 16).

[0119] Fig. 16 is an exploded perspective view of a laminated coil component. As shown in Fig. 16, the laminated coil component 1D includes a plurality of layers LDi, LDb, LDc, LDd, Lde, LDf, LDg, LDh, LDi, Ldj, and LDk. The laminated coil component 1D is configured, for example, by laminating layers LDa to LDk in order from the main surface 2c side.

[0120] The layer LDa is composed of an element layer 50a.

[0121] The layer LDb is configured by providing a coil conductor layer 52b on an element layer 50b. The layer LDc is configured by providing a coil conductor layer 52c on an element layer 50c, and also providing a first through-hole conductor layer 54c. The coil conductor layer 52b and the first through-hole conductor layer 54c are connected by a through-hole conductor 53a. The coil conductor layer 52b and the coil conductor layer 52c are connected by a through-hole conductor 53b.

[0122] The layer LDd is configured by providing a coil conductor layer 52d on an element layer 50d, and also providing a first through-hole conductor layer 54d. The coil conductor layer 52c and the coil conductor layer 52d are connected by a through-hole conductor 53c.

[0123] The layer LDe is configured by providing a coil conductor layer 52e on an element layer 50e, and also providing a first through-hole conductor layer 54e. The coil conductor layer 52d and the coil conductor layer 52e are connected by a through-hole conductor 53d.

[0124] The layer LDf is configured by providing a coil conductor layer 52f on an element layer 50f, and also providing a first through-hole conductor layer 54f. The coil conductor layer 52e and the coil conductor layer 52f are connected by a through-hole conductor 53e.

[0125] The layer LDg is configured by providing a coil conductor layer 52g on an element layer 50g, and also providing a first through-hole conductor layer 54g on the element layer 50g. The coil conductor layer 52f and the coil conductor layer 52g are connected by a through-hole conductor 53f.

[0126] The layer LDh is configured by providing a coil conductor layer 52h on an element layer 50h, and providing a first through-hole conductor layer 54h on the element layer 50h. The coil conductor layer 52g and the coil conductor layer 52h are connected by a through-hole conductor 53g.

[0127] The layer LDi is configured by providing a first through-hole conductor layer 54i and a second through-hole conductor layer 56i on an element layer 50i. The coil conductor layer 52h and the second through-hole conductor layer 56i are connected by a through-hole conductor 53h.

[0128] The layer LDj is configured by providing a first through-hole conductor layer 54j and a second through-hole conductor layer 56j on an element layer 50j. The layer LDk is configured by providing a first terminal electrode 3 and a second terminal electrode 4 on an element layer 50k.

[0129] 15, in the laminated coil component 1D, the distance L2 between the first connecting conductor 6D and the second coil portion 9D is greater than the distance L1 between the first connecting conductor 6D and the first coil portion 8D. In other words, the distance L1 between the first connecting conductor 6D and the first coil portion 8D is smaller than the distance L2 between the first connecting conductor 6D and the second coil portion 9D. That is, the second coil portion 9C is disposed farther away from the first connecting conductor 6 than the first coil portion 8C. Moreover, the distance L3 between the first connecting conductor 6D and the third coil portion 10D is greater than the distance L1 between the first connecting conductor 6D and the first coil portion 8D and is smaller than the distance L2 between the first connecting conductor 6D and the second coil portion 9D (L1>L3>L2).

[0130] In the laminated coil component 1D, the distances L1, L2, and L3 between the first connecting conductor 6D and the first coil portion 8D, the second coil portion 9D, and the third coil portion 10D are set based on the potential difference occurring when the laminated coil component 1D is used. Specifically, in the laminated coil component 1D, the distances L1, L2, and L3 between the first connecting conductor 6D and the first coil portion 8D, the second coil portion 9D, and the third coil portion 10D are set so that the greater the potential difference between the first connecting conductor 6D, the greater the distance between the first connecting conductor 6D. The potential difference is greatest between the first connecting conductor 6D and the second coil portion 9D, and is smallest between the first connecting conductor 6D and the first coil portion 8D. The potential difference is greatest in the order of between the first connecting conductor 6D and the first coil portion 8D, between the first connecting conductor 6D and the third coil portion 10D, and between the first connecting conductor 6D and the second coil portion 9D. As a result, in the laminated coil component 1D, the distance L1 between the first connecting conductor 6D and the first coil portion 8D, the distance L3 between the first connecting conductor 6D and the third coil portion 10D, and the distance L2 between the first connecting conductor 6D and the second coil portion 9D increase in this order.

[0131] Distance L1 is the shortest distance between the first connecting conductor 6D and the first coil portion 8D (coil conductor layers 52b-52d). Distance L2 is the shortest distance between the first connecting conductor 6D and the second coil portion 9D (coil conductor layers 52g, 52h). Distance L3 is the shortest distance between the first connecting conductor 6D and the third coil portion 10D (coil conductor layers 52e, 52f). Note that distances L1, L2, and L3 are shown in FIG. 15 as examples for convenience, and may differ from the actual shortest distances.

[0132] The first coil portion 8D, the second coil portion 9D, and the third coil portion 10D have different diameters. The diameter of the first coil portion 8D is larger than the diameters of the second coil portion 9D and the third coil portion 10D. The diameter of the third coil portion 10D is larger than the diameter of the second coil portion 9D. The coil axis of the first coil portion 8D, the coil axis of the second coil portion 9D, and the coil axis of the third coil portion 10D do not coincide. The coil axis of the second coil portion 9D is located closer to the end surface 2b than the coil axis of the first coil portion 8D and the third coil portion 10D. The coil axis of the third coil portion 10D is located closer to the end surface 2b than the first coil portion 8D of the first coil portion 8D.

[0133] The edges of the first coil portion 8D, the second coil portion 9D, and the third coil portion 10D on the side of the end face 2b of the element body 2 coincide in the first direction D1. Specifically, when viewed from the first direction D1, parts of the coil conductor layer 52b and the coil conductor layer 52d constituting the first coil portion 8D overlap with parts of the coil conductor layer 52h constituting the second coil portion 9D, and parts of the coil conductor layer 52f constituting the third coil portion 10D.

[0134] When viewed from the first direction D1, the second coil portion 9D and the third coil portion 10D do not overlap the first terminal electrode 3. That is, the second coil portion 9D and the third coil portion 10D are not located above the first terminal electrode 3. Specifically, when viewed from the first direction D1, the coil conductor layers 52e to 52h do not overlap the first terminal electrode 3.

[0135] As described above, in the laminated coil component 1D according to the present embodiment, similarly to the laminated coil component 1, the distance L2 between the first connecting conductor 6D and the second coil portion 9D is greater than the distance L1 between the first connecting conductor 6D and the first coil portion 8D and the distance L3 between the first connecting conductor 6D and the third coil portion 10D. As a result, in the laminated coil component 1D, the second coil portion 9D and the third coil portion 10D, which have a larger potential difference with the first connecting conductor 6D, are disposed farther away from the first connecting conductor 6D than the first coil portion 8D. Therefore, in the laminated coil component 1D, the stray capacitance formed between the first connecting conductor 6D and the second coil portion 9D can be reduced. Also, in the laminated coil component 1D, the diameter of the first coil portion 8D can be increased. Therefore, the inductance of the coil 5D can be increased. As described above, in the laminated coil component 1D, the generation of stray capacitance is suppressed, and the characteristics are improved.

[0136] In the laminated coil component 1D according to the present embodiment, the distances L1, L2, and L3 between the first connecting conductor 6D and the first coil portion 8D, the second coil portion 9D, and the third coil portion 10D are set based on the potential difference that occurs when the laminated coil component 1D is used. Specifically, in the laminated coil component 1D, the distances L1, L2, and L3 between the first connecting conductor 6D and the first coil portion 8D, the second coil portion 9D, and the third coil portion 10D are set so that the greater the potential difference between the first connecting conductor 6D, the greater the distance between the first connecting conductor 6D. In this configuration, the distances are set according to the potential difference, so that it is possible to reduce stray capacitance.

[0137] Although the embodiment of the present invention has been described above, the present invention is not necessarily limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention.

[0138] In the above embodiment, a configuration in which each of the first terminal electrode 3 and the second terminal electrode 4 has a rectangular shape has been described as an example. However, the shapes of the first terminal electrode 3 and the second terminal electrode 4 are not limited to this.

[0139] In the above embodiment, the first connecting conductors 6, 6C, 6D and the second connecting conductors 7, 7C, 7D are arranged diagonally. However, the first connecting conductors 6, 6C, 6D and the second connecting conductors 7, 7C, 7D may be arranged in other positions.

[0140] In the above embodiment, the first connecting conductors 6, 6C, 6D and the second connecting conductors 7, 7C, 7D are described as having a cylindrical shape as an example. However, the shapes of the first connecting conductors 6, 6C, 6D and the second connecting conductors 7, 7C, 7D are not limited to this and may be triangular prisms, square prisms, etc.

[0141] In the above embodiment, the coil 5 is composed of a plurality of coil conductor layers 12b-12h, the first coil portion 8 is composed of coil conductor layers 12b-12d, and the second coil portion 9 is composed of coil conductor layers 12e-12h. However, the number of coil conductor layers constituting the coil 5 is not limited to the above-mentioned value. Furthermore, the number of coil conductor layers constituting the first coil portion 8 and the number of coil conductor layers constituting the second coil portion 9 may be the same or different. Furthermore, the coil 5 may include other coil portions. The same applies to the coils 5A, 5B, 5C, and 5D. [Explanation of symbols]

[0142] Reference Signs List 1, 1A, 1B, 1C, 1D... laminated coil component, 2... element body, 2a, 2b... end face, 2c... main surface (other main surface), 2d... main surface (one main surface), 2e, 2f... side surface, 3... first terminal electrode, 4... second terminal electrode, 5, 5A, 5B, 5C, 5D... coil, 6, 6C, 6D... first connecting conductor, 7, 7C, 7D... second connecting conductor, 8, 8A, 8B, 8C, 8D... first coil portion, 9, 9A, 9B, 9C, 9D... second coil portion, 10a to 10k, 20a to 20k, 30a to 30k, 40a to 40k, 50a to 50k... element layer (insulating layer), L1, L2, L3... distance.

Claims

1. an element body formed by laminating a plurality of insulating layers, the element body having a pair of end faces opposed to each other, a pair of main surfaces opposed to each other, and a pair of side surfaces opposed to each other, one of the main surfaces being a mounting surface; a coil disposed within the element body, the coil axis extending along the opposing direction of the pair of main surfaces; a first terminal electrode and a second terminal electrode connected to the coil and disposed on the mounting surface, the first terminal electrode being disposed on one of the end faces and the second terminal electrode being disposed on the other end face; a first connecting conductor that is disposed outside the coil when viewed from the opposing direction within the element body, extends in the opposing direction, and connects one end of the coil located on the other principal surface side to the first terminal electrode; a second connection conductor connecting the other end of the coil located on the one of the principal surfaces to the second terminal electrode, the coil includes a first coil portion having the one end of the coil and disposed on the other main surface side, and a second coil portion having the other end of the coil and disposed on one of the main surfaces, a shortest distance between the first connecting conductor and the second coil portion is greater than a shortest distance between the first connecting conductor and the first coil portion, The first coil portion and the second coil portion have different diameters, an edge on the other end surface of the first coil portion and an edge on the other end surface of the second coil portion coincide with each other in the opposing direction.

2. The laminated coil component according to claim 1 , wherein outer edges of the first coil portion and the second coil portion partially overlap each other when viewed from the opposing direction.

3. 3. The laminated coil component according to claim 1, wherein the first terminal electrode and the second coil portion do not overlap when viewed from the opposing direction.

4. a distance between the first connecting conductor and the coil is set based on a potential difference between the first connecting conductor and the coil during use; 4. The laminated coil component according to claim 1, wherein the distance is longer at a position where the potential difference is large than at a position where the potential difference is smaller than the position where the potential difference is large.

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