Laminated coil components

Abstract

A stacked coil component (1) comprises a body (2), a coil (8) and a pair of terminal electrodes (4, 5), each of the pair of terminal electrodes (4, 5) being formed by stacking a plurality of electrode layers having different shapes in a stacking direction and being exposed at end faces (2a, 2b), a main face (2d) and a pair of side faces (2e, 2f), and when viewed from the stacking direction, an electrode portion of the terminal electrode (4, 5) formed by an electrode layer and exposed at the side faces (2e, 2f) of the body (2) comprises an overlapping portion (A1) in which one electrode layer overlaps with at least a portion of another electrode portion formed by another electrode layer adjacent to the stacking direction, and a non-overlapping portion (A2) that does not overlap with the other electrode portion.

Description

Technical Field

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

[0002] As an existing laminated coil component, for example, there is known a laminated coil component disclosed in Patent Document 1 (Japanese Patent Publication No. 2017-73536). The laminated coil component described in Patent Document 1 includes a body, a coil arranged in the body and having a coil axis extending in relative directions of a pair of side surfaces of the body, and a pair of terminal electrodes embedded in the body and arranged across the end surface and mounting surface of the body. Summary of the invention

[0003] In order to improve the characteristics of a stacked coil component, it is desirable to increase the diameter of the coil. However, in a structure in which the terminal electrode is arranged in the body, when the diameter of the coil is increased, the distance between the terminal electrode and the coil becomes shorter. As a result, the stray capacitance (parasitic capacitance) formed by the coil and the terminal electrode becomes larger, and the characteristics are reduced. Therefore, in the existing stacked coil component, in order to ensure the distance between the coil and the terminal electrode, the terminal electrode is set to an L-shape.

[0004] In addition, in the stacked coil component, in order to firmly fix it to the circuit substrate or the like by solder, a structure in which the terminal electrode is also exposed on the side of the element body, and solder can also be formed on the terminal electrode located on the side of the element body. The stacked coil component with this structure is manufactured by stacking the conductor pattern constituting the coil and the electrode layer constituting the terminal electrode. In the case where the shapes of the multiple electrode layers are the same, it is difficult to ensure the area of ​​the contact (opposite) surface with the element body in each electrode layer. Therefore, in particular, among the multiple electrode layers constituting the terminal electrode, the outermost electrode layer exposed on the side of the element body may be peeled off during its manufacturing process, and a defect is likely to occur. Therefore, a defect may occur in the formed terminal electrode.

[0005] One aspect of the present invention is to provide a laminated coil component capable of suppressing the occurrence of malfunctions in terminal electrodes.

[0006] According to one aspect of the present invention, a stacked coil component comprises: a body having a plurality of stacked dielectric layers and having a pair of end faces opposite to each other, a pair of main faces opposite to each other, and a pair of side faces opposite to each other in the stacking direction of the plurality of dielectric layers, and one main face is a mounting face; a coil arranged in the body, and the coil axis extends in the stacking direction; and a pair of terminal electrodes connected to the coil and buried in the body in each of a pair of end face sides of the body, each of the pair of terminal electrodes being formed by stacking a plurality of electrode layers having different shapes in the stacking direction and exposed at the end face, the mounting face and a pair of side faces, and when viewed from the stacking direction, an electrode portion of the terminal electrode formed by one electrode layer and exposed at the side face of the body has an overlapping portion in which one electrode layer overlaps with at least a portion of another electrode portion formed by another electrode layer adjacent to the stacking direction, and a non-overlapping portion that does not overlap with the other electrode portion.

[0007] In a laminated coil component according to one aspect of the present invention, one electrode portion of a terminal electrode has an overlapping portion that overlaps at least a portion of another electrode portion, and a non-overlapping portion that does not overlap with the other electrode portion.

[0008] In the non-overlapping portion of one electrode portion exposed on the side of the element body, the contact area with the element body can be ensured on the surface opposite to the element body. Therefore, in the laminated coil component, since the bonding strength between the terminal electrode and the element body can be ensured, the terminal electrode can be prevented from peeling off from the element body. As a result, in the laminated coil component, the occurrence of a defect in the terminal electrode can be suppressed.

[0009] In one embodiment, another electrode portion, when viewed from the stacking direction, may include a first portion extending in the relative direction of a pair of main surfaces and a second portion extending in the relative direction of a pair of end surfaces, and a non-repeating portion of an electrode portion, when viewed from the stacking direction, includes an area corresponding to a corner portion formed by the first portion and the second portion. In this structure, in the non-repeating portion, the contact area with the element body can be more reliably ensured. Therefore, in the stacked coil component, it is possible to suppress the terminal electrode from peeling off from the element body, and to suppress the occurrence of adverse conditions in the terminal electrode.

[0010] In one embodiment, the non-repeating portion of an electrode portion may have a portion that is convexly curved toward a direction of separation from the coil when viewed from the stacking direction. In this structure, the contact area with the element body can be ensured in the non-repeating portion, and the stray capacitance generated between the coil and the electrode portion can be reduced.

[0011] In one embodiment, the non-repeating portion of one electrode portion may have a concave-convex portion when viewed from the stacking direction. In this structure, the contact area with the element body can be ensured in the non-repeating portion, and the stray capacitance generated between the coil and the electrode portion can be reduced.

[0012] In one embodiment, when viewed from the stacking direction, each of the pair of terminal electrodes does not overlap with the coil. In this structure, the stray capacitance generated between each of the pair of terminal electrodes and the coil can be reduced. Thus, in the stacked coil component, the characteristics can be improved.

[0013] In one embodiment, when viewed from the relative direction of a pair of end faces, each of the pair of terminal electrodes does not overlap with the coil. In this structure, the stray capacitance generated between each of the pair of terminal electrodes and the coil can be reduced. Thus, in the stacked coil component, the characteristics can be improved.

[0014] According to one aspect of the present invention, it is possible to suppress the occurrence of malfunctions in terminal electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a perspective view showing the laminated coil component according to the first embodiment.

[0016] Figure 2 yes Figure 1 An exploded perspective view of the laminated coil component shown.

[0017] Figure 3 is a cross-sectional view showing the structure of a laminated coil component.

[0018] Figure 4A is a diagram showing a cross-sectional structure along the second direction.

[0019] Figure 4B is a diagram showing a cross-sectional structure along a first direction.

[0020] Figure 5 It is a side view showing the structure of a laminated coil component according to a second embodiment.

[0021] Figure 6 yes Figure 5 An exploded perspective view of the laminated coil component shown.

[0022] Fig. 7A is a diagram showing a cross-sectional structure along the second direction.

[0023] Figure 7B is a diagram showing a cross-sectional structure along a first direction.

[0024] Figure 8A side view showing the structure of a laminated coil component according to a third embodiment.

[0025] Fig. 9 yes Figure 8 An exploded perspective view of the laminated coil component shown.

[0026] Fig. 10A is a diagram showing a cross-sectional structure along the second direction.

[0027] Fig. 10B is a diagram showing a cross-sectional structure along a first direction.

[0028] Fig.11A It is a side view showing the structure of a laminated coil component according to another embodiment.

[0029] Fig. 11B It is a side view showing the structure of a laminated coil component according to another embodiment. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, the same elements or elements having the same functions are denoted by the same reference numerals, and repeated descriptions will be omitted.

[0031] [First embodiment]

[0032] like Figure 1 As shown, the laminated coil component 1 includes a rectangular parallelepiped element 2 and a pair of terminal electrodes 4, 5. The pair of terminal electrodes 4, 5 are respectively arranged at both ends of the element 2. The rectangular parallelepiped shape includes a rectangular parallelepiped shape with chamfered corners and ridges, and a rectangular parallelepiped shape with rounded corners and ridges.

[0033] The element body 2 has a pair of end faces 2a and 2b opposite to each other; a pair of main faces 2c and 2d opposite to each other; and a pair of side faces 2e and 2f opposite to each other. The relative direction of the pair of main faces 2c and 2d, that is, the direction parallel to the end faces 2a and 2b, is the first direction D1. The relative direction of the pair of end faces 2a and 2b, that is, the direction parallel to the main faces 2c and 2d, is the second direction D2. The relative direction of the pair of side faces 2e and 2f is the third direction D3. In the present embodiment, the first direction D1 is the height direction of the element body 2. The second direction D2 is the long side direction of the element body 2 and is orthogonal to the first direction D1. The third direction D3 is the width direction of the element body 2 and is orthogonal to the first direction D1 and the second direction D2.

[0034] A pair of end faces 2a, 2b extend in a first direction D1 in a manner connecting a pair of main faces 2c, 2d. A pair of end faces 2a, 2b also extend in a third direction D3, i.e., the short side direction of a pair of main faces 2c, 2d. A pair of side faces 2e, 2f extend in the first direction D1 in a manner connecting a pair of main faces 2c, 2d. A pair of side faces 2e, 2f also extend in a second direction D2, i.e., the long side direction of a pair of 2a, 2b. The stacked coil component 1 is mounted on an electronic device (e.g., a circuit substrate or an electronic component), for example, by soldering. In the stacked coil component 1, the main surface 2d constitutes a mounting surface relative to the electronic device.

[0035] like Figure 2 As shown, the element body 2 is composed of a plurality of dielectric layers 6 stacked in the third direction D3. The element body 2 has a plurality of stacked dielectric layers 6. In the element body 2, the stacking direction of the plurality of dielectric layers 6 is consistent with the third direction D3. In the actual element body 2, the individual dielectric layers 6 are integrated to the extent that the boundaries between the individual dielectric layers 6 cannot be visually identified. Each dielectric layer 6, for example, can be composed of a magnetic material. The magnetic material includes, for example, a Ni-Cu-Zn ferrite material, a Ni-Cu-Zn-Mg ferrite material, or a Ni-Cu ferrite material. The magnetic material constituting each dielectric layer 6 can include an Fe alloy. Each dielectric layer 6 can be composed of a non-magnetic material. The non-magnetic material, for example, includes a glass ceramic material or a dielectric material. In the present embodiment, each dielectric layer 6 is composed of a sintered body of a green sheet containing a magnetic material.

[0036] like Figure 3 As shown, the terminal electrode 4 is arranged on the end face 2a side of the element body 2. The terminal electrode 5 is arranged on the end face 2b side of the element body 2. A pair of terminal electrodes 4, 5 are separated from each other in the second direction D2. Each terminal electrode 4, 5 is buried in the element body 2. The terminal electrode 4 is arranged across the end face 2a and the main surface 2d. The terminal electrode 5 is arranged across the end face 2b and the main surface 2d. In the present embodiment, the surface of the terminal electrode 4 is substantially the same as each of the end face 2a and the main surface 2d. The surface of the terminal electrode 5 is substantially the same as each of the end face 2b and the main surface 2d.

[0037] Each terminal electrode 4, 5 includes a conductive material. The conductive material includes, for example, Ag or Pd. Each terminal electrode 4, 5 is formed as a sintered body of a conductive paste containing a conductive material powder. The conductive material powder includes, for example, Ag powder or Pd powder. A plating layer can be formed on the surface of each terminal electrode 4, 5. The plating layer is formed, for example, by electroplating or electroless plating. The plating layer includes, for example, Ni, Sn, or Au.

[0038] The terminal electrode 4 is exposed at the end face 2a, the main face 2d, and the side faces 2e and 2f. The terminal electrode 4 has a plurality of electrode portions 4a, 4b, 4c, 4d, and 4e. In the present embodiment, the electrode portions 4a, 4b, 4c, 4d, and 4e are formed integrally. The electrode portion (one electrode portion) 4a is arranged at one end portion in the third direction D3 and is exposed at the end face 2a, the main face 2d, and the side face 2e. The electrode portion (another electrode portion) 4b is arranged adjacent to the electrode portion 4a and is exposed at the end face 2a and the main face 2d. The electrode portion 4c is arranged adjacent to the electrode portion 4b and is exposed at the end face 2a and the main face 2d. The electrode portion (another electrode portion) 4d is arranged adjacent to the electrode portion 4c and is exposed at the end face 2a and the main face 2d. The electrode portion (one electrode portion) 4e is arranged at the other end portion in the third direction D3 and is exposed at the end face 2a, the main face 2d, and the side face 2f.

[0039] like Figure 3 and 4A As shown, the electrode parts 4a and 4e, when viewed from the third direction D3, present a polygonal shape. The electrode parts 4a and 4e present a shape in which one corner of a rectangle is cut out in a straight line. Specifically, when viewed from the third direction D3, the electrode parts 4a and 4e have three sides in contact with the element body 2. Among the three sides, the first side extends along the first direction D1, the second side extends along the second direction D2, and the third side connects the end of the first side on the main surface 2c side and the end of the second side on the end surface 2b side, and is inclined toward the main surface 2d side.

[0040] like Figure 3 As shown, the electrode parts 4b and 4d are L-shaped when viewed from the third direction D3. The electrode parts 4b and 4d have a first part extending along the first direction D1 and a second part extending along the second direction D2, and the first part and the second part are connected at the ridgeline of the element body 2. The electrode part 4c is in the shape of a rectangular parallelepiped. The electrode part 4c extends along the second direction D2 and the third direction D3.

[0041] The electrode portion 4e (4a), when viewed from the third direction D3, has a repeating portion A1 that overlaps with the electrode portion 4d (4b) and a non-repeating portion A2 that does not overlap with the electrode portion 4d (4b). That is, the electrode portion 4e (4a) has a portion that overlaps with the adjacent electrode portion in the third direction D3 and a portion that does not overlap. In the electrode portion 4e (4a), the non-repeating portion A2 that does not overlap with the electrode portion 4d (4b) includes an area corresponding to a corner portion where the first portion and the second portion of the electrode portion 4d (4b) are formed in an L-shaped shape, for example, in a triangular shape. In the non-repeating portion A2, one side surface in the third direction D3 is exposed, and the other side surface is in contact with the element body 2.

[0042] like Figure 2 As shown, the terminal electrode 4 is composed of a plurality of electrode layers 10, a plurality of electrode layers 12, and a plurality of electrode layers 14 stacked. In the present embodiment, the number of electrode layers 10 is "2", the number of electrode layers 12 is "4", and the number of electrode layers 14 is "7". The electrode layers 10, 12, 14 are provided in the defective portions formed in the corresponding dielectric layers 6. The electrode layers 10, 12, 14 are formed by firing a conductive paste located in the defective portions formed in the green sheet. The green sheet and the conductive paste are fired simultaneously. Therefore, when the dielectric layer 6 is obtained from the green sheet, the electrode layers 10, 12, 14 are obtained from the conductive paste. In the actual terminal electrode 4, the respective electrode layers 10, 12, 14 are integrated to such an extent that the boundaries between the respective electrode layers 10, 12, 14 cannot be visually identified.

[0043] Each electrode layer 10 is arranged at the outermost part of the terminal electrode 4 in the third direction D3. That is, each electrode layer 10 constitutes the electrode parts 4a and 4e. Each electrode layer 12, when viewed from the third direction D3, presents an L-shape. The electrode layer 12 constitutes the electrode parts 4b and 4d. The electrode layer 12 has a plurality of layer parts 12a and 12b. The layer part 12a extends along the first direction D1. The layer part 12b extends along the second direction D2. Each electrode layer 14, when viewed from the third direction D3, presents a straight line shape. The electrode layer 14 extends along the second direction D2. The electrode layer 14 constitutes the electrode part 4c.

[0044] The terminal electrode 5 is exposed on the end surface 2b, the main surface 2d, and the side surfaces 2e and 2f. The terminal electrode 5 has a plurality of electrode portions 5a, 5b, 5c, 5d, and 5e (see Figure 4B ). In the present embodiment, the electrode portions 5a, 5b, 5c, 5d, and 5e are formed integrally. The electrode portion (one electrode portion) 5a is arranged at one end portion in the third direction D3, and is exposed at the end face 2b, the main surface 2d, and the side surface 2e. The electrode portion (another electrode portion) 5b is arranged adjacent to the electrode portion 5a, and is exposed at the end face 2b and the main surface 2d. The electrode portion 5c is arranged adjacent to the electrode portion 5b, and is exposed at the end face 2b and the main surface 2d. The electrode portion (another electrode portion) 5d is arranged adjacent to the electrode portion 5c, and is exposed at the end face 2b and the main surface 2d. The electrode portion (one electrode portion) 5e is arranged at the other end portion in the third direction D3, and is exposed at the end face 2b, the main surface 2d, and the side surface 2f.

[0045] The electrode portions 5a and 5e are polygonal in shape when viewed from the third direction D3. The electrode portions 5a and 5e are in the shape of a straight line cutting out one corner of a rectangle. Specifically, when viewed from the third direction D3, the electrode portions 5a and 5e have three sides in contact with the element body 2. Among the three sides, the first side extends in the first direction D1, the second side extends in the second direction D2, and the third side connects the end of the first side on the main surface 2c side and the end of the second side on the end surface 2a side, and is inclined toward the main surface 2d side.

[0046] The electrode portions 5b and 5d are L-shaped when viewed from the third direction D3. The electrode portions 5b and 5d have a first portion extending along the first direction D1 and a second portion extending along the second direction D2, and the first portion and the second portion are connected at the ridgeline of the element body 2. The electrode portion 45 is in the shape of a rectangular parallelepiped. The electrode portion 5c extends along the second direction D2 and the third direction D3.

[0047] like Figure 3 As shown, the electrode portion 5e (5a), when viewed from the third direction D3, has a repeating portion A1 that overlaps with the electrode portion 5d (5b) and a non-repeating portion A2 that does not overlap with the electrode portion 5d (5b). That is, the electrode portion 5e (5a) has a portion that overlaps with the adjacent electrode portion in the third direction D3 and a portion that does not overlap. In the electrode portion 5e (5a), the non-repeating portion A2 that does not overlap with the electrode portion 5d (5b) includes an area corresponding to a corner portion where the first portion and the second portion of the electrode portion 5d (5b) are formed in an L-shaped shape, for example, in a triangular shape. In the non-repeating portion A2, one side surface in the third direction D3 is exposed, and the other side surface is in contact with the element body 2.

[0048] like Figure 2 As shown, the terminal electrode 5 is composed of a plurality of electrode layers 11, a plurality of electrode layers 13, and a plurality of electrode layers 15 stacked. In the present embodiment, the number of electrode layers 11 is "2", the number of electrode layers 13 is "4", and the number of electrode layers 15 is "7". The electrode layers 11, 13, 15 are provided in the defective portions formed in the corresponding dielectric layers 6. The electrode layers 11, 13, 15 are formed by firing a conductive paste located in the defective portions formed in the green sheet. The green sheet and the conductive paste are fired simultaneously. Therefore, when the dielectric layer 6 is obtained from the green sheet, the electrode layers 11, 13, 15 are obtained from the conductive paste. In the actual terminal electrode 5, the respective electrode layers 11, 13, 15 are integrated to such an extent that the boundaries between the respective electrode layers 11, 13, 15 cannot be visually identified.

[0049] Each electrode layer 11 is arranged at the outermost part of the terminal electrode 5 in the third direction D3. That is, each electrode layer 11 constitutes the electrode parts 5a and 5e. Each electrode layer 13, when viewed from the third direction D3, presents an L-shape. The electrode layer 13 constitutes the electrode parts 5b and 5d. The electrode layer 13 has a plurality of layer parts 13a and 13b. The layer part 13a extends along the first direction D1. The layer part 13b extends along the second direction D2. Each electrode layer 15, when viewed from the third direction D3, presents a straight line shape. The electrode layer 15 extends along the second direction D2. The electrode layer 15 constitutes the electrode part 5c.

[0050] The laminated coil component 1, such as Figure 3 As shown in FIG. 1 , the coil 8 is provided in the element body 2. The coil axis AX of the coil 8 extends along the third direction D3. When viewed from the third direction D3, the coil 8 has a substantially elliptical shape.

[0051] Coil 8, such as Figure 2 As shown, there are a first coil conductor 22, a second coil conductor 23, a third coil conductor 24, a fourth coil conductor 25, and a fifth coil conductor 26. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, and the fifth coil conductor 26 are arranged in the order of the first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, and the fifth coil conductor 26 along the third direction D3. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, and the fifth coil conductor 26 have a shape in which a part of the loop is cut off, and have one end and the other end. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, and the fifth coil conductor 26 are formed with a predetermined width.

[0052] The laminated coil component 1 has a first connection conductor 20 and a second connection conductor 21 connecting the terminal electrode 5 and one end of the coil 8, and a third connection conductor 27 and a fourth connection conductor 28 connecting the terminal electrode 4 and the other end of the coil 8. The first connection conductor 20, the second connection conductor 21, the third connection conductor 27 and the fourth connection conductor 28 are in a straight line shape. The first connection conductor 20, the second connection conductor 21, the third connection conductor 27 and the fourth connection conductor 28 are formed with a predetermined width.

[0053] The first connecting conductor 20 is located in the same layer as one electrode layer 12 and one electrode layer 13. The first connecting conductor 20 is connected to the electrode layer 13 via the connecting conductor 20a. The connecting conductor 20a is located in the same layer as the first connecting conductor 20. One end of the first connecting conductor 20 is connected to the connecting conductor 20a. The connecting conductor 20a is connected to the layer portion 13a. The connecting conductor 20a connects the first connecting conductor 20 and the electrode layer 13. The connecting conductor 20a can be connected to the layer portion 13b. The first connecting conductor 20 is separated from the electrode layer 12 located in the same layer. In the present embodiment, the first connecting conductor 20, the connecting conductor 20a, and the electrode layer 13 are formed integrally.

[0054] The second connection conductor 21 is located in the same layer as one electrode layer 14 and one electrode layer 15. The second connection conductor 21 is separated from the electrode layers 14 and 15 located in the same layer. The first connection conductor 20 and the second connection conductor 21 are adjacent to each other in the third direction D3. When viewed from the third direction D3, the first connection conductor 20 and the second connection conductor 21 overlap each other.

[0055] The first coil conductor 22 is located in the same layer as one electrode layer 14 and one electrode layer 15. The first coil conductor 22 is separated from the electrode layers 14 and 15 located in the same layer. The second connection conductor 21 and the first coil conductor 22 are adjacent to each other in the third direction D3. When viewed from the third direction D3, a portion of the second connection conductor 21 overlaps a portion of the first coil conductor 22.

[0056] The second coil conductor 23 is located in the same layer as one electrode layer 14 and one electrode layer 15. The second coil conductor 23 is separated from the electrode layers 14 and 15 located in the same layer. The first coil conductor 22 and the second coil conductor 23 are adjacent to each other in the third direction D3. When viewed from the third direction D3, a portion of the first coil conductor 22 and a portion of the second coil conductor 23 overlap each other.

[0057] The third coil conductor 24 is located in the same layer as one electrode layer 14 and one electrode layer 15. The third coil conductor 24 is separated from the electrode layers 14 and 15 located in the same layer. The second coil conductor 23 and the third coil conductor 24 are adjacent to each other in the third direction D3. When viewed from the third direction D3, a portion of the second coil conductor 23 and a portion of the third coil conductor 24 overlap each other.

[0058] The fourth coil conductor 25 is located in the same layer as one electrode layer 14 and one electrode layer 15. The fourth coil conductor 25 is separated from the electrode layers 14 and 15 located in the same layer. The third coil conductor 24 and the fourth coil conductor 25 are adjacent to each other in the third direction D3. When viewed from the third direction D3, a portion of the third coil conductor 24 and a portion of the fourth coil conductor 25 overlap each other.

[0059] The fifth coil conductor 26 is located in the same layer as one electrode layer 14 and one electrode layer 15. The fifth coil conductor 26 is separated from the electrode layers 14 and 15 located in the same layer. The fourth coil conductor 25 and the fifth coil conductor 26 are adjacent to each other in the third direction D3. When viewed from the third direction D3, a portion of the fourth coil conductor 25 and a portion of the fifth coil conductor 26 overlap each other.

[0060] The third connection conductor 27 is located in the same layer as one electrode layer 14 and one electrode layer 15. The third connection conductor 27 is separated from the electrode layers 14 and 15 located in the same layer. The fifth coil conductor 26 and the third connection conductor 27 are adjacent to each other in the third direction D3. When viewed from the third direction D3, a portion of the fifth coil conductor 26 and a portion of the third connection conductor 27 overlap each other.

[0061] The fourth connecting conductor 28 is located in the same layer as one electrode layer 12 and one electrode layer 13. The fourth connecting conductor 28 is connected to the electrode layer 12 via the connecting conductor 28a. The connecting conductor 28a is located in the same layer as the fourth connecting conductor 28. One end of the fourth connecting conductor 28 is connected to the connecting conductor 28a. The connecting conductor 28a is connected to the layer portion 12a. The connecting conductor 28a connects the fourth connecting conductor 28 and the electrode layer 12. The connecting conductor 28a can be connected to the layer portion 12b. The fourth connecting conductor 28 is separated from the electrode layer 13 located in the same layer. In this embodiment, the fourth connecting conductor 28, the connecting conductor 28a, and the electrode layer 12 are formed integrally.

[0062] The first connection conductor 20, the second connection conductor 21, the first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, the fifth coil conductor 26, the third connection conductor 27 and the fourth connection conductor 28 are electrically connected. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25 and the fifth coil conductor 26 constitute the coil 8. The coil 8 is electrically connected to the terminal electrode 5 through the first connection conductor 20 and the second connection conductor 21. The coil 8 is electrically connected to the terminal electrode 4 through the third connection conductor 27 and the fourth connection conductor 28.

[0063] The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, the fifth coil conductor 26, the first connecting conductor 20, the second connecting conductor 21, the third connecting conductor 27, the fourth connecting conductor 28, and the connecting conductors 20a and 28a contain a conductive material. The conductive material contains Ag or Pd. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, the fifth coil conductor 26, the first connecting conductor 20, the second connecting conductor 21, the third connecting conductor 27, the fourth connecting conductor 28, and the connecting conductors 20a and 28a are configured as a sintered body of a conductive paste containing a conductive material powder. The conductive material powder, for example, contains Ag powder or Pd powder.

[0064] In the present embodiment, the first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, the fifth coil conductor 26, the first connecting conductor 20, the second connecting conductor 21, the third connecting conductor 27, the fourth connecting conductor 28, and the connecting conductors 20a and 28a include the same conductive material as the terminal electrodes 4 and 5. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, the fifth coil conductor 26, the first connecting conductor 20, the second connecting conductor 21, the third connecting conductor 27, the fourth connecting conductor 28, and the connecting conductors 20a and 28a may include a conductive material different from that of the terminal electrodes 4 and 5.

[0065] The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, the fifth coil conductor 26, the first connection conductor 20, the second connection conductor 21, the third connection conductor 27, the fourth connection conductor 28, and the connecting conductors 20a and 28a are provided in the defective portions formed in the corresponding dielectric layer 6. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, the fifth coil conductor 26, the first connection conductor 20, the second connection conductor 21, the third connection conductor 27, the fourth connection conductor 28, and the connecting conductors 20a and 28a are formed by firing the conductive paste located in the defective portion formed in the green sheet. The green sheet and the conductive paste are fired simultaneously as described above. Therefore, when the dielectric layer 6 is obtained from the raw sheet, the first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, the fifth coil conductor 26, the first connecting conductor 20, the second connecting conductor 21, the third connecting conductor 27, the fourth connecting conductor 28, and the connecting conductors 20a and 28a are obtained from the conductive paste.

[0066] The defective portion formed on the raw sheet is formed, for example, by the following process. First, a raw sheet is formed by applying a base body paste containing the constituent material of the dielectric layer 6 and a photosensitive material to a substrate. The substrate is, for example, a PET film. The photosensitive material contained in the base body paste may be either a negative type or a positive type, and a known material may be used. Next, the raw sheet is exposed and developed by photolithography using a mask corresponding to the defective portion, and the defective portion is formed on the raw sheet on the substrate. The raw sheet on which the defective portion is formed is a base body pattern.

[0067] The electrode layers 10, 11, 12, 13, 14, 15, the first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, the fifth coil conductor 26, the first connecting conductor 20, the second connecting conductor 21, the third connecting conductor 27, the fourth connecting conductor 28, and the connecting conductors 20a, 28a are formed, for example, by the following process.

[0068] First, a conductive material layer is formed by applying a conductive paste containing a photosensitive material on a substrate. The photosensitive material contained in the conductive paste may be either a negative type or a positive type, and a known material may be used. Next, the conductive material layer is exposed and developed by photolithography using a mask corresponding to the defective portion, thereby forming a conductor pattern corresponding to the shape of the defective portion on the substrate.

[0069] The laminated coil component 1 is obtained, for example, by the following process following the above process. A sheet located on the same layer as the body pattern and the conductor pattern is prepared by combining a conductor pattern with a missing portion of the body pattern. After heat-treating a laminated body obtained by laminating a predetermined number of prepared sheets, a plurality of raw chips are obtained from the laminated body. In this process, for example, the raw laminated body is cut into chip shapes by a cutting machine. Thus, a plurality of raw chips of a predetermined size can be obtained. Then, the raw chips are fired. By this firing, the laminated coil component 1 is obtained. In the laminated coil component 1, the terminal electrodes 4 and 5 are formed integrally with the coil 8.

[0070] like Figure 2 As shown in FIG. 1 , when viewed from the third direction D3, the terminal electrode 4 does not overlap with the coil 8. Similarly, when viewed from the third direction D3, the terminal electrode 5 does not overlap with the coil 8. Figure 4B As shown, when viewed from the second direction D2, the terminal electrode 4 does not overlap with the coil 8. Similarly, when viewed from the second direction D2, the terminal electrode 5 does not overlap with the coil 8.

[0071] In the manufacturing process of the laminated coil component 1, as described above, a predetermined number of sheets are stacked on a substrate to obtain a laminate, and the laminate is cut. When the laminate is cut, the laminate is peeled off from the substrate. At this time, if the bonding force between the electrode layers 10, 11 and the dielectric layer 6 is small, the electrode layers 10, 11 arranged on the substrate may adhere to the substrate and be damaged, or a portion of the electrode layers 10, 11 may be peeled off from the laminate. In addition, when cutting by a cutter, the surface in contact with the substrate is set as the entry surface of the blade of the cutter. At this time, there is a risk of peeling of the electrode layers 10, 11 by the blade of the cutter, especially when a portion of the electrode layers 10, 11 has been peeled off, the electrode layers 10, 11 can be easily peeled off when the blade enters. When roller polishing is performed in a state where the electrode layers 10, 11 are peeled off, the terminal electrodes 4, 5 may be peeled off from the element body 2.

[0072] Regarding the above-mentioned problem, in the laminated coil component 1 according to the present embodiment, the electrode portions 4a and 4e of the terminal electrode 4 have an overlapping portion A1 overlapping with at least a portion of the electrode portions 4b and 4d and a non-overlapping portion A2 not overlapping with the electrode portions 4b and 4d. Thus, in the laminated coil component 1, in the non-overlapping portion A2 of the electrode portions 4a and 4e exposed on the side surfaces 2e and 2f of the element body 2, the contact area with the element body 2 can be ensured on the surface facing the element body 2. The bonding force between the electrode portions 4a, 4b, 4c, 4d, and 4e and the element body 2 is greater than the bonding force between the electrode portions 4a, 4b, 4c, 4d, and 4e. The terminal electrode 5 also has the same structure. Therefore, in the laminated coil component 1, by ensuring the bonding strength between the terminal electrodes 4 and 5 and the element body 2, it is possible to suppress the terminal electrodes 4 and 5 from peeling off from the element body 2. As a result, in the laminated coil component 1, it is possible to suppress the occurrence of defects in the terminal electrodes 4 and 5.

[0073] In the laminated coil component 1 involved in this embodiment, the electrode parts 4b, 4d, when viewed from the third direction D3, are L-shaped and have a first part extending along the first direction D1 and a second part extending along the second direction D2. The non-repeating part A2 of the electrode parts 4a, 4e includes an area corresponding to the corner formed by the first part and the second part. In this structure, in the non-repeating part A2, the contact area with the element body 2 can be more reliably ensured. Therefore, in the laminated coil component 1, the terminal electrodes 4, 5 can be prevented from peeling off from the element body 2, and the occurrence of adverse conditions in the terminal electrodes 4, 5 can be prevented.

[0074] In the laminated coil component 1 according to the present embodiment, when viewed from the third direction D3, each of the pair of terminal electrodes 4 and 5 does not overlap with the coil 8. In this structure, the stray capacitance generated between each of the pair of terminal electrodes 4 and 5 and the coil 8 can be reduced. Thus, in the laminated coil component 1, the characteristics can be improved.

[0075] In the laminated coil component 1 according to the present embodiment, when viewed from the second direction D2, each of the pair of terminal electrodes 4 and 5 does not overlap with the coil 8. In this structure, the stray capacitance generated between each of the pair of terminal electrodes 4 and 5 and the coil 8 can be reduced. Thus, in the laminated coil component 1, the characteristics can be improved.

[0076] [Second embodiment]

[0077] Next, the second embodiment will be described. Figure 5 , Fig. 7A and Figure 7B As shown, the laminated coil component 1A includes an element body 2 and a pair of terminal electrodes 4A and 5A. The laminated coil component 1A is different in structure from the laminated coil component 1 in terms of the terminal electrodes 4A and 5A.

[0078] The terminal electrode 4A is exposed on the end surface 2a, the main surface 2d, and the side surfaces 2e and 2f. The terminal electrode 4A has a plurality of electrode portions 4Aa, 4Ab, 4Ac, 4Ad, and 4Ae. The electrode portions 4Aa, 4Ac, and 4Ae have the same structure as the electrode portions 4a, 4c, and 4e of the laminated coil component 1.

[0079] The electrode portions 4Ab and 4Ad are L-shaped when viewed from the third direction D3. The electrode portions 4Ab and 4Ad have a first portion extending along the first direction D1 and a second portion extending along the second direction D2, and the first portion and the second portion are connected at the ridgeline of the element body 2. Figure 7B As shown, in the electrode portion 4Ab, a portion of the side surface 2e side becomes lower than the side surface 2f side in the first direction D1. In the electrode portion 4Ad, a portion of the side surface 2f side becomes lower than the side surface 2e side in the first direction D1.

[0080] The electrode portion 4Ae (4Aa) has a repeating portion A1 that overlaps with the electrode portion 4Ad (4Ab) and a non-repeating portion A2 that does not overlap with the electrode portion 4Ad (4Ab) when viewed from the third direction D3. That is, the electrode portion 4Ae (4Aa) has a portion that overlaps with the adjacent electrode portion in the third direction D3 and a portion that does not overlap. In the electrode portion 4Ae (4Aa), the non-repeating portion A2 that does not overlap with the electrode portion 4Ad (4Ab) includes a region corresponding to a corner portion where the first portion and the second portion of the electrode portion 4Ad (4Ab) are formed in an L-shaped shape, for example, in a triangular shape. In the non-repeating portion A2, one side surface in the third direction D3 is exposed, and the other side surface is in contact with the element body 2.

[0081] like Figure 6 As shown, the terminal electrode 4A is composed of a plurality of electrode layers 10, a plurality of electrode layers 12, a plurality of electrode layers 14, and a plurality of electrode layers 16 stacked. In the present embodiment, the number of electrode layers 10 is "2", the number of electrode layers 12 is "2", the number of electrode layers 14 is "7", and the number of electrode layers 16 is "2". The electrode layer 16 constitutes the electrode portions 4Ab and 4Ad. The height of the electrode layer 16 in the first direction is lower than that of the electrode layer 12. As a result, the end portions of the electrode portions 4Ab and 4Ad constituted by the electrode layers 12 and 16 on the main surface 2c side are stepped.

[0082] like Figure 5 , Fig. 7A and Figure 7B As shown, the terminal electrode 5A is exposed on the end surface 2b, the main surface 2d, and the side surfaces 2e and 2f. The terminal electrode 5A has a plurality of electrode portions 5Aa, 5Ab, 5Ac, 5Ad, and 5Ae. The electrode portions 5Aa, 5Ac, and 5Ae have the same structure as the electrode portions 5a, 5c, and 5e of the laminated coil component 1.

[0083] The electrode portions 5Ab and 5Ad are L-shaped when viewed from the third direction D3. The electrode portions 5Ab and 5Ad have a first portion extending along the first direction D1 and a second portion extending along the second direction D2, and the first portion and the second portion are connected at the ridgeline of the element body 2. Figure 7B As shown, in the electrode portion 5Ab, a portion of the side surface 2e side becomes lower than the side surface 2f side in the first direction D1. In the electrode portion 5Ad, a portion of the side surface 2f side becomes lower than the side surface 2e side in the first direction D1.

[0084] The electrode portion 5Ae (5Aa) has an overlapping portion A1 that overlaps with the electrode portion 5Ad (5Ab) and a non-overlapping portion A2 that does not overlap with the electrode portion 5Ad (5Ab) when viewed from the third direction D3. That is, the electrode portion 5Ae (5Aa) has a portion that overlaps with the adjacent electrode portion in the third direction D3 and a portion that does not overlap. In the electrode portion 5Ae (5Aa), the non-overlapping portion A2 that does not overlap with the electrode portion 5Ad (5Ab) includes an area corresponding to a corner portion where the first portion and the second portion of the electrode portion 5Ad (5Ab) are formed in an L-shaped shape, for example, in a triangular shape. In the non-overlapping portion A2, one side surface in the third direction D3 is exposed, and the other side surface is in contact with the element body 2.

[0085] like Figure 6 As shown, the terminal electrode 5A is composed of a plurality of electrode layers 11, a plurality of electrode layers 13, a plurality of electrode layers 15, and a plurality of electrode layers 17 stacked. In this embodiment, the number of electrode layers 11 is "2", the number of electrode layers 13 is "2", the number of electrode layers 15 is "7", and the number of electrode layers 17 is "2". The electrode layer 17 constitutes the electrode parts 5Ab and 5Ad. The height of the electrode layer 17 in the first direction is lower than that of the electrode layer 13. As a result, the end portions of the electrode parts 5Ab and 5Ad constituted by the electrode layers 13 and 17 on the main surface 2c side are stepped.

[0086] As described above, the laminated coil component 1A according to the present embodiment has the same operational effects as those of the laminated coil component 1 .

[0087] [Third Embodiment]

[0088] Next, the third embodiment will be described. Figure 8 , Fig. 10A and Fig. 10B As shown, the laminated coil component 1B includes an element body 2 and a pair of terminal electrodes 4B and 5B. The laminated coil component 1B is different in structure from the laminated coil component 1 in terms of the terminal electrodes 4B and 5B.

[0089] The terminal electrode 4B is exposed on the end surface 2a, the main surface 2d, and the side surfaces 2e and 2f. The terminal electrode 4B has a plurality of electrode portions 4Ba, 4Bb, 4Bc, 4Bd, and 4Be. The electrode portions 4Ba, 4Bc, and 4Be have the same structure as the electrode portions 4a, 4c, and 4e of the laminated coil component 1.

[0090] The electrode parts 4Bb and 4Bd are L-shaped when viewed from the third direction D3. The electrode parts 4Bb and 4Bd have a first portion extending along the first direction D1 and a second portion extending along the second direction D2, and the first portion and the second portion are connected at the ridgeline of the element body 2. Fig. 10B As shown, in the electrode portion 4Bb, a portion of the side surface 2f side becomes lower in the first direction D1 than the side surface 2e side. In the electrode portion 4Bd, a portion of the side surface 2e side becomes lower in the first direction D1 than the side surface 2f side.

[0091] The electrode portion 4Be (4Ba) has a repeating portion A1 that overlaps with the electrode portion 4Bd (4Bb) and a non-repeating portion A2 that does not overlap with the electrode portion 4Bd (4Bb) when viewed from the third direction D3. That is, the electrode portion 4Be (4Ba) has a portion that overlaps with the adjacent electrode portion in the third direction D3 and a portion that does not overlap. In the electrode portion 4Be (4Ba), the non-repeating portion A2 that does not overlap with the electrode portion 4Bd (4Bb) includes an area corresponding to a corner portion where the first portion and the second portion of the electrode portion 4Bd (4Bb) are formed in an L-shaped shape, for example, in a triangular shape. In the non-repeating portion A2, one side surface in the third direction D3 is exposed, and the other side surface is in contact with the element body 2.

[0092] like Fig. 9 As shown, the terminal electrode 4B is composed of a plurality of electrode layers 10, a plurality of electrode layers 12, a plurality of electrode layers 14, and a plurality of electrode layers 18 stacked. In the present embodiment, the number of electrode layers 10 is "2", the number of electrode layers 12 is "2", the number of electrode layers 14 is "7", and the number of electrode layers 18 is "2". The electrode layer 18 constitutes the electrode portions 4Bb and 4Bd. The height of the electrode layer 18 in the first direction is also lower than that of the electrode layer 12. As a result, the end portions of the electrode portions 4Bb and 4Bd constituted by the electrode layer 12 and the electrode layer 18 on the main surface 2c side become stepped.

[0093] like Figure 8 , Fig. 10A and Fig. 10B As shown, the terminal electrode 5B is exposed on the end surface 2b, the main surface 2d, and the side surfaces 2e and 2f. The terminal electrode 5B has a plurality of electrode portions 5Ba, 5Bb, 5Bc, 5Bd, and 5Be. The electrode portions 5Ba, 5Bc, and 5Be have the same structure as the electrode portions 5a, 5c, and 5e of the laminated coil component 1.

[0094] The electrode portions 5Bb and 5Bd are L-shaped when viewed from the third direction D3. The electrode portions 5Bb and 5Bd have a first portion extending along the first direction D1 and a second portion extending along the second direction D2, and the first portion and the second portion are connected at the ridgeline of the element body 2. Fig. 10B As shown, in the electrode portion 5Bb, a portion of the side surface 2f is lower than the side surface 2e in the first direction D1. In the electrode portion 5Bd, a portion of the side surface 2e is lower than the side surface 2f in the first direction D1.

[0095] The electrode portion 5Be (5Ba) has a repeating portion A1 that overlaps with the electrode portion 5Bd (5Bb) and a non-repeating portion A2 that does not overlap with the electrode portion 5Bd (5Bb) when viewed from the third direction D3. That is, the electrode portion 5Be (5Ba) has a portion that overlaps with the adjacent electrode portion in the third direction D3 and a portion that does not overlap. In the electrode portion 5Be (5Ba), the non-repeating portion A2 that does not overlap with the electrode portion 5Bd (5Bb) includes an area corresponding to a corner portion where the first portion and the second portion of the electrode portion 5Bd (5Bb) are formed in an L-shaped shape, for example, in a triangular shape. In the non-repeating portion A2, one side surface in the third direction D3 is exposed, and the other side surface is in contact with the element body 2.

[0096] like Fig. 9 As shown, the terminal electrode 5B is composed of a plurality of electrode layers 11, a plurality of electrode layers 13, a plurality of electrode layers 15, and a plurality of electrode layers 19 stacked. In the present embodiment, the number of electrode layers 11 is "2", the number of electrode layers 13 is "2", the number of electrode layers 15 is "7", and the number of electrode layers 19 is "2". The electrode layer 19 constitutes the electrode portions 5Bb and 5Bd. The height of the electrode layer 19 in the first direction is also lower than that of the electrode layer 13. As a result, the end portions of the electrode portions 5Bb and 5Bd constituted by the electrode layer 13 and the electrode layer 19 on the main surface 2c side become stepped.

[0097] As described above, the laminated coil component 1B according to the present embodiment has the same operational effects as those of the laminated coil component 1 .

[0098] Hereinabove, although the embodiment of the present invention is described, the present invention is not necessarily limited to the above-described embodiment, and various modifications can be made within a scope not departing from the gist of the present invention.

[0099] In the above embodiment, the shapes of the electrode portions 4a, 4e (4Aa, 4Ae, 4Ba, 4Be) of the terminal electrodes 4 are as follows: Figure 3 The shape shown in FIG. 4 is described as an example. However, the shape of the electrode portions 4a and 4e of the terminal electrode 4 is not limited to this. Fig.11A As shown in FIG. 1 , the electrode portion 4Ce of the terminal electrode 4C in the laminated coil component 1C may have a bent portion. The bent portion is convexly bent in a direction away from the coil 8. Fig. 11BAs shown, the electrode portion 4De of the electrode portion 4D in the laminated coil component 1D may also have a concave-convex portion. In this structure, the contact area with the element body 2 can be ensured, and the stray capacitance generated between the coil 8 can be reduced. The same is true for the electrode portion 5Ce of the terminal electrode 5C and the electrode portion 5De of the terminal electrode 5D.

[0100] In the above embodiment, the coil 8 includes the first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, and the fifth coil conductor 26. However, the number of the plurality of coil conductors constituting the coil 8 is not limited to the above value.

[0101] In the above embodiment, the electrode parts 4b and 4d of the terminal electrode 4 have a first part and a second part, and the electrode parts 4b and 4d are L-shaped when viewed from the third direction D3. The first part of the electrode parts 4b and 4d, when viewed from the third direction D3, can extend along the first direction D1 as a whole. In addition, the second part of the electrode parts 4b and 4d, when viewed from the third direction D3, can extend along the second direction D2 as a whole. Therefore, in the first part and the second part of the electrode parts 4b and 4d, the surface in contact with (opposite to) the element body 2 can be provided with projections and depressions. The same is true for the terminal electrodes 4A and 4B, and the terminal electrodes 5, 5A and 5B.

[0102] In the above embodiment, the corner of the first part and the second part of the electrode parts 4b and 4d formed with the terminal electrode 4 is demarcated by the first part and the second part at a substantially right angle as an example. However, the corner may be demarcated by a surface that curves from the first part toward the second part, or may be demarcated by a surface that tilts straightly from the first part toward the second part. The same is true for the terminal electrodes 4A and 4B, and the terminal electrodes 5, 5A and 5B.

Claims

1. A laminated coil component, characterized in that: have: A body having a plurality of stacked dielectric layers and having a pair of end faces facing each other, a pair of main faces facing each other, and a pair of side faces facing each other in a stacking direction of the plurality of dielectric layers, wherein one of the main faces is a mounting face; A coil, which is arranged in the body, and the coil axis extends along the stacking direction; as well as a pair of terminal electrodes connected to the coil and embedded in the element body at each of the pair of end faces of the element body, Each of the pair of terminal electrodes is formed by stacking a plurality of electrode layers having different shapes in the stacking direction, and is exposed on the end surface, the mounting surface, and the pair of side surfaces. When viewed from the stacking direction, an electrode portion of the terminal electrode exposed on the side surface of the element body and formed by one of the electrode layers has an overlapping portion in which one of the electrode layers overlaps with at least a portion of another electrode portion formed by another of the electrode layers adjacent in the stacking direction, and a non-overlapping portion that does not overlap with the other electrode portion. When viewed from the stacking direction, the other electrode portion has a portion that does not overlap with the one electrode portion.

2. The laminated coil component according to claim 1, wherein: The other electrode portion, when viewed from the stacking direction, has a first portion extending in the opposing direction of the pair of main surfaces and a second portion extending in the opposing direction of the pair of end surfaces, The non-repeating portion of one of the electrode portions includes a region corresponding to a corner portion formed by the first portion and the second portion when viewed from the stacking direction.

3. The laminated coil component according to claim 1 or 2, characterized in that: The non-overlapping portion of one of the electrode portions has a portion that is convexly curved toward a direction away from the coil when viewed from the stacking direction.

4. The laminated coil component according to claim 1 or 2, characterized in that: The non-repeating portion of one of the electrode portions has a concavo-convex portion when viewed from the stacking direction.

5. The laminated coil component according to any one of claims 1 to 4, characterized in that: When viewed from the stacking direction, each of the pair of terminal electrodes does not overlap with the coil.

6. The laminated coil component according to any one of claims 1 to 5, characterized in that: When viewed from the opposing direction of the pair of end faces, each of the pair of terminal electrodes does not overlap with the coil.

Images