Laminated coil parts

Abstract

The laminated coil component of the present invention comprises a substrate, a coil arranged in the substrate, and a terminal electrode arranged on the substrate. The substrate has a plurality of insulating layers stacked in a first direction, is in a rectangular shape, and has a first side surface and a second side surface, a first end surface and a second end surface, a first main surface and a second main surface. The first side surface and the second side surface are opposite in the first direction. The first end surface and the second end surface are opposite in a second direction intersecting the first direction. The first main surface and the second main surface are opposite in a third direction intersecting the first direction and the second direction. The terminal electrode comprises a first electrode portion and a second electrode portion. The first electrode portion comprises a first exposed surface exposed to the first main surface. The second electrode portion comprises a second exposed surface exposed to the first end surface. The first exposed surface and the second exposed surface are adjacent via a ridgeline portion between the first main surface and the first end surface of the substrate. The first exposed surface is separated from the outer edge of the first main surface. The second exposed surface is separated from the outer edge of the first end surface.

Description

Technical Field

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

[0002] Japanese Patent Application Laid-Open No. 2014-154716 describes an electronic component including a base body formed by stacking a plurality of insulating layers, a circuit element provided in the base body, and a terminal electrode electrically connected to the circuit element. In this electronic component, the terminal electrode is continuously formed over two adjacent surfaces of the base body.

[0003] In the above-mentioned electronic components, the terminal electrodes may be peeled off due to external stress. Summary of the invention

[0004] One aspect of the present invention provides a laminated coil component capable of suppressing separation of terminal electrodes.

[0005] A laminated coil component according to one aspect of the present invention comprises a substrate, a coil arranged in the substrate, and a terminal electrode arranged on the substrate. The substrate has a plurality of insulating layers stacked in a first direction. The substrate is in the shape of a rectangular parallelepiped. The substrate has a first side surface and a second side surface, a first end surface and a second end surface, a first main surface and a second main surface. The first side surface and the second side surface are opposed to each other in a first direction. The first end surface and the second end surface are opposed to each other in a second direction intersecting the first direction. The first main surface and the second main surface are opposed to each other in a third direction intersecting the first direction and the second direction. The terminal electrode comprises a first electrode portion and a second electrode portion. The first electrode portion comprises a first exposed surface exposed to the first main surface. The second electrode portion comprises a second exposed surface exposed to the first end surface. The first exposed surface and the second exposed surface are adjacent to each other via a ridgeline portion between the first main surface and the first end surface of the substrate. The first exposed surface is separated from the outer edge of the first main surface. The second exposed surface is separated from the outer edge of the first end surface.

[0006] In the laminated coil component, the first exposed surface is separated from the outer edge of the first main surface. The second exposed surface is separated from the outer edge of the first end surface. That is, the entire first exposed surface is surrounded by the first main surface. The entire second exposed surface is surrounded by the first end surface. Therefore, compared with the case where the terminal electrode is continuously formed over the first main surface and the first end surface, the area where the first electrode portion contacts the substrate and the area where the second electrode portion contacts the substrate are respectively increased. Therefore, the bonding force between the terminal electrode and the substrate is increased, so that the terminal electrode can be prevented from peeling off from the substrate.

[0007] The coil may also have a coil axis along the first direction. In this case, a magnetic flux along the first direction is generated. The terminal electrode is arranged on the first main surface and the first end surface. Therefore, compared with the case where the terminal electrode is arranged on the first side surface or the second side surface intersecting the first direction, the magnetic flux intersecting the terminal electrode is reduced. Therefore, the Q value can be improved.

[0008] The stacked coil component may also include a connecting conductor connecting the end of the coil and the second electrode portion. The connecting conductor may also be connected to the second main surface side closer to the center of the third direction of the second electrode portion and extend toward the second main surface side. In this case, the stray capacitance (parasitic capacitance) formed between the second electrode portion and the connecting conductor can be suppressed.

[0009] The first electrode portion may also include a first opposing surface facing the first exposed surface, and a pair of third side surfaces connecting the first exposed surface and the first opposing surface and facing each other in the second direction. The pair of third side surfaces may also be curved. In this case, cracks are suppressed from occurring on the substrate.

[0010] The second electrode portion may also include a second opposing surface facing the second exposed surface, and a pair of fourth side surfaces connecting the second exposed surface and the second opposing surface and facing each other in the third direction. The pair of fourth side surfaces may also be curved. In this case, cracks are suppressed from being generated in the substrate.

[0011] The first electrode portion and the second electrode portion may not be electrically connected to each other in the substrate. In this case, there is no electrical path between the first electrode portion and the second electrode portion in the substrate. If the electrical path between the first electrode portion and the second electrode portion is two, one inside and one outside the substrate, it is possible to have an adverse effect on the electrical characteristics. Therefore, even if an electrical path between the first electrode portion and the second electrode portion is formed outside the substrate, the adverse effect on the electrical characteristics can be suppressed.

[0012] The end of the first electrode portion in the third direction may also be in a concave-convex shape. In this case, the adhesive force between the first electrode portion and the substrate is increased, thereby further suppressing the peeling of the terminal electrode.

[0013] The end of the second electrode portion in the second direction may also be in a concave-convex shape. In this case, the adhesive force between the second electrode portion and the substrate is increased, thereby further suppressing the peeling of the terminal electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a perspective view of a laminated coil component according to an embodiment.

[0015] Figure 2A yes Figure 1 Side view of a laminated coil part.

[0016] Figure 2B yes Figure 1 Bottom view of the laminated coil part.

[0017] Figure 3 yes Figure 1 An exploded perspective view of a stacked coil component.

[0018] Figure 4 yes Figure 1 A perspective view of the substrate is shown.

[0019] Figure 5 yes Figure 1 A top view of a laminated coil part.

[0020] Fig. 6A It is a side view of a laminated coil component according to a modification.

[0021] Figure 6B It is a bottom view of a laminated coil component according to a modification. DETAILED DESCRIPTION

[0022] 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 denoted by the same reference numerals, and repeated descriptions are omitted.

[0023] like Figure 1 As shown, the laminated coil component 1 includes a rectangular parallelepiped base 2, a pair of terminal electrodes 3 respectively arranged at both ends of the base 2, a coil 10, and connecting conductors 26 and 27. The rectangular parallelepiped shape includes a rectangular parallelepiped shape with chamfered corners and ridges and a rectangular parallelepiped shape with rounded corners and ridges.

[0024] The substrate 2 has a pair of end faces 2a facing each other, main faces 2c and 2d facing each other, and a pair of side faces 2e facing each other. Hereinafter, the direction in which the pair of side faces 2e face to face is set as the first direction D1, the direction in which the pair of end faces 2a face to face is set as the second direction D2, and the direction in which the main faces 2c and 2d face to face is set as the third direction D3. The first direction D1, the second direction D2, and the third direction D3 intersect with each other (orthogonal in this case). In the present embodiment, the first direction D1 is the width direction of the substrate 2. The first direction D1 is also the short side direction of the main faces 2c and 2d. The second direction D2 is the length direction of the substrate 2. The second direction D2 is also the long side direction of the main faces 2c and 2d. The third direction D3 is the height direction of the substrate 2.

[0025] A pair of end faces 2a extend along a third direction D3 in a manner connecting the main faces 2c and 2d. A pair of end faces 2a also extend along the first direction D1 in a manner connecting a pair of side faces 2e. The main faces 2c and 2d extend along the second direction D2 in a manner connecting the pair of end faces 2a. The main faces 2c and 2d also extend along the first direction D1 in a manner connecting a pair of side faces 2e. A pair of side faces 2e extend along the third direction D3 in a manner connecting the main faces 2c and 2d. A pair of side faces 2e also extend along the second direction D2 in a manner connecting the end faces 2a. The stacked coil part 1 is mounted on an electronic device (e.g., a circuit substrate or an electronic component) by, for example, welding. In the stacked coil part 1, the main face 2c constitutes a mounting surface opposite to the electronic device.

[0026] like Figure 2A , Figure 2B and Figure 3 As shown, the base 2 is formed by stacking a plurality of insulating layers 6 in a first direction D1. The base 2 has a plurality of insulating layers 6 stacked in the first direction D1. The stacking direction of the plurality of insulating layers 6 stacked in the base 2 is consistent with the first direction D1. In the actual base 2, the insulating layers 6 are integrated to such an extent that the boundaries between the insulating layers 6 cannot be identified. Figure 2A and Figure 2B Insulator layers 6 other than the two end portions in the stacking direction are not shown in the figure.

[0027] Each insulator layer 6 is formed of a dielectric material containing a glass component. That is, the substrate 2 includes a dielectric material containing a glass component as a compound of elements constituting the substrate 2. The glass component is, for example, borosilicate glass. As a dielectric material, for example, BaTiO 3 Class, Ba(Ti, Zr)O 3 or (Ba, Ca)TiO 3 Each insulating layer 6 is composed of a sintered body of a ceramic green sheet containing a glass ceramic material.

[0028] like Figure 4 As shown, the substrate 2 has a pair of recesses 7. The pair of recesses 7 are separated from each other in the second direction D2. Each recess 7 is a space recessed from the outer surface of the substrate 2 to the inner side. Each recess 7 has a shape corresponding to the shape of the corresponding terminal electrode 3. The pair of recesses 7 have the same shape as each other.

[0029] One recess 7 is provided on one end face 2a side of the base 2. Another recess 7 is provided on the other end face 2a side of the base 2. Each recess 7 has an end face recess 8 provided on the corresponding end face 2a and a main face recess 9 provided on the main face 2c. The end face recess 8 and the main face recess 9 are adjacent to each other via a ridgeline 2i between the main face 2c and the end face 2a of the base 2. The end face recess 8 and the main face recess 9 are not connected to each other. The end face recess 8 of one recess 7 is provided on one end face 2a. The end face recess 8 of another recess 7 is provided on the other end face 2a. The main face recess 9 of one recess 7 is provided on the one end face 2a side than the main face recess 9 of another recess 7.

[0030] like Figure 1 to Figure 5 As shown, a pair of terminal electrodes 3 are separated from each other in the second direction D2. Each terminal electrode 3 is buried in the substrate 2. Each terminal electrode 3 is arranged in a corresponding recess 7. Each terminal electrode 3 is in a substantially rectangular plate shape. A pair of terminal electrodes 3 present the same shape. A pair of terminal electrodes 3 are electrically connected to the end 10a of the coil 10, respectively.

[0031] One terminal electrode 3 is provided on one end face 2a side of the substrate 2. Another terminal electrode 3 is provided on the other end face 2a side of the substrate 2. Each terminal electrode 3 has an electrode portion 4 and an electrode portion 5. The electrode portion 4 is provided in the end face recess 8 and contacts the inner surface of the end face recess 8. The electrode portion 5 is provided in the main face recess 9 and contacts the inner surface of the main face recess 9.

[0032] The electrode parts 4 and 5 are provided independently. The electrode parts 4 and 5 are adjacent to each other via the ridge part 2i. The electrode parts 4 and 5 are separated from each other via the ridge part 2i and are not connected to each other. The electrode parts 4 and 5 are not electrically connected to each other in the substrate 2. That is, the electrode parts 4 and 5 are electrically insulated from each other in the substrate 2. The terminal electrode 3 is not formed over the end face 2a and the main face 2c. The terminal electrode 3 is not provided on the ridge part 2i. The terminal electrode 3 is not exposed at the ridge part 2i. The conductor layer is not exposed at the ridge part 2i, but the insulating layer 6 is exposed. The electrode parts 4 and 5 are electrically connected to each other by welding outside the substrate 2, for example, when the stacked coil part 1 is welded and mounted on the mounting substrate.

[0033] The electrode portion 4 is in a roughly rectangular plate shape and is arranged along the end face 2a. The electrode portion 4 has an exposed surface 4a, an opposing surface 4b, a pair of side surfaces 4c, and a pair of side surfaces 4d. The exposed surface 4a is exposed at the end face 2a and is roughly flat with the end face 2a. The exposed surface 4a is rectangular. The exposed surface 4a has a pair of long sides along the first direction D1 and a pair of short sides along the third direction D3. When viewed from the second direction D2, the exposed surface 4a is separated from the outer edge 2g of the end face 2a. The exposed surface 4a is surrounded by the end face 2a. The end face 2a surrounds the entire circumference of the exposed surface 4a.

[0034] The facing surface 4b faces the exposed surface 4a in the second direction D2. The facing surface 4b is arranged parallel to the exposed surface 4a. When viewed from the second direction D2, the entire facing surface 4b overlaps with the exposed surface 4a. In this embodiment, the facing surface 4b is a flat surface, but it may be a curved surface.

[0035] A pair of side surfaces 4c connect the exposed surface 4a and the opposing surface 4b. The pair of side surfaces 4c are opposed to each other in the third direction D3. The side surface 4c is a curved curved surface, which is smoothly connected to the opposing surface 4b. When viewed from the second direction D2, the entire side surface 4c overlaps with the exposed surface 4a. In this embodiment, the entire side surface 4c is a curved surface, but a portion (for example, the portion on the opposing surface 4b side) may also be a curved surface, and the entire side surface may also be a plane. The pair of side surfaces 4c may have the same shape as each other, or may have different shapes from each other.

[0036] A pair of side surfaces 4d connects the exposed surface 4a and the opposing surface 4b. The pair of side surfaces 4d are opposed to each other in the first direction D1. In the present embodiment, the side surface 4d is a plane and is arranged parallel to the side surface 2e. The side surface 4d may also be a curved surface. The pair of side surfaces 4d may have the same shape as each other, but may also have different shapes from each other.

[0037] The electrode portion 5 is in a roughly rectangular plate shape and is arranged along the main surface 2c. The electrode portion 5 has an exposed surface 5a, an opposing surface 5b, a pair of side surfaces 5c, and a pair of side surfaces 5d. The exposed surface 5a is exposed on the main surface 2c and is roughly aligned with the main surface 2c. The exposed surface 5a is rectangular. The exposed surface 5a has a pair of long sides along the first direction D1 and a pair of short sides along the second direction D2. When viewed from the third direction D3, the exposed surface 5a is separated from the outer edge 2h of the main surface 2c. The exposed surface 5a is surrounded by the main surface 2c. The main surface 2c surrounds the entire circumference of the exposed surface 5a.

[0038] The facing surface 5b faces the exposed surface 5a in the third direction D3. The facing surface 5b is arranged parallel to the exposed surface 5a. When viewed from the third direction D3, the entire facing surface 5b overlaps with the exposed surface 5a. In this embodiment, the facing surface 5b is a flat surface, but may be a curved surface.

[0039] A pair of side surfaces 5c connects the exposed surface 5a and the opposing surface 5b. The pair of side surfaces 5c are opposed to each other in the second direction D2. The side surface 5c is a curved surface that is smoothly connected to the opposing surface 5b. When viewed from the third direction D3, the entire side surface 5c overlaps with the exposed surface 5a. In the present embodiment, the entire side surface 5c is a curved surface, but a portion (for example, a portion on the opposing surface 5b side) may also be a curved surface, and the entire side surface may also be a flat surface. The pair of side surfaces 5c may have the same shape as each other, but may also have different shapes from each other.

[0040] A pair of side surfaces 5d connects the exposed surface 5a and the opposing surface 5b. The pair of side surfaces 5d are opposite to each other in the first direction D1. In the present embodiment, the side surface 5d is a plane configured parallel to the side surface 2e. The side surface 5d may also be a curved surface. The pair of side surfaces 5d may have the same shape as each other, but may also have different shapes from each other.

[0041] like Figure 3 As shown, the terminal electrode 3 is formed by stacking a plurality of electrode layers 11. In the present embodiment, the number of the electrode layers 11 is "6". Each electrode layer 11 is provided in a defective portion formed in the corresponding insulating layer 6. The defective portion constitutes a recess 7. The electrode layer 11 contains a conductive material. The conductive material contains, for example, Ag or Pd. The electrode layer 11 is formed as a sintered body of a conductive paste containing conductive material powder. The conductive material powder contains, for example, Ag powder or Pd powder. The electrode layer 11 may also contain a glass component. That is, the electrode layer 11 may also be formed as a sintered body of a conductive paste containing a metal component and a glass component composed of conductive material powder. The glass component is a compound of elements constituting the substrate 2, and is the same component as the glass component contained in the substrate 2. The content of the glass component may be appropriately set. Each electrode layer 11 has layer portions 11a and 11b. The layer portion 11a extends along the third direction D3. The layer portion 11b extends along the second direction D2.

[0042] The electrode portion 4 is formed by stacking a plurality of layer portions 11a of the electrode layer 11. In the electrode portion 4, the plurality of layer portions 11a are integrated to such an extent that the boundaries between the layer portions 11a cannot be identified. The electrode portion 5 is formed by stacking a plurality of layer portions 11b of the electrode layer 11. In the electrode portion 5, the plurality of layer portions 11b are integrated to such an extent that the boundaries between the layer portions 11b cannot be identified.

[0043] like Figure 5 As shown, the coil 10 and the connecting conductors 26 and 27 are arranged in the substrate 2 and are not exposed from the substrate 2. The coil 10 has a coil axis AX along the first direction D1. A pair of end portions 10a of the coil 10 are electrically connected to a pair of terminal electrodes 3. One end portion 10a is electrically connected to one terminal electrode 3 through the connecting conductor 26. The other end portion 10a is electrically connected to the other terminal electrode 3 through the connecting conductor 27.

[0044] like Figure 3As shown, the coil 10 has a first coil conductor 22, a second coil conductor 23, a third coil conductor 24, and a fourth coil conductor 25. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, and the fourth coil conductor 25 are arranged in the order of the first coil conductor 22, the second coil conductor 23, the third coil conductor 24, and the fourth coil conductor 25 along the first direction D1. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, and the fourth coil conductor 25 are in a partially interrupted shape of a ring, and each has one end and the other end.

[0045] The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, and the fourth coil conductor 25 are formed with a predetermined width (length in a direction intersecting the first direction D1) and a height (length in the first direction). The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, and the fourth coil conductor 25 are formed with the same width and height.

[0046] The first coil conductor 22 is located in the same layer as the pair of electrode layers 11. The first coil conductor 22 is connected to the layer portion 11a of the other electrode layer 11 located in the same layer via the connecting conductor 26. The connecting conductor 26 is located in the same layer as the pair of electrode layers 11 and the first coil conductor 22. The connecting conductor 26 connects the first coil conductor 22 and the layer portion 11a of the other electrode layer 11. One end of the first coil conductor 22 is connected to the connecting conductor 26. One end of the first coil conductor 22 constitutes one end 10a of the coil 10. In the present embodiment, the first coil conductor 22, the connecting conductor 26, and the layer portion 11a of the other electrode layer 11 are formed integrally.

[0047] Also like Figure 5 As shown, the connection conductor 26 is connected to the main surface 2d side of the center of the third direction D3 of the layer part 11a (electrode part 4). When viewed from the first direction D1, the connection conductor 26 has a predetermined width. Specifically, the center of the width direction of the connection conductor 26 is connected to the main surface 2d side of the center of the third direction D3 of the layer part 11a. When viewed from the first direction D1, the connection conductor 26 can be connected to the main surface 2d side of the center of the third direction D3 of the layer part 11a in more than half of the width direction of the connection conductor 26, or it can be connected to the main surface 2c side of the center of the third direction D3 of the layer part 11a in a part of the width direction. The connection conductor 26 extends from the connection part of the layer part 11a (electrode part 4) toward the main surface 2d side along the third direction D3. The connection conductor 26 is linear and tilted toward the inner side of the substrate 2 relative to the third direction D3. In addition, the connection conductor 26 can also connect the first coil conductor 22 and the layer part 11b (electrode part 5).

[0048] The second coil conductor 23 is located in the same layer as the pair of electrode layers 11. The second coil conductor 23 is separated from the pair of electrode layers 11 located in the same layer. The other end of the first coil conductor 22 and the one end of the second coil conductor 23 are adjacent to each other in the first direction D1 and are directly connected to each other. When viewed from the first direction D1, the other end of the first coil conductor 22 and the one end of the second coil conductor 23 overlap each other.

[0049] The third coil conductor 24 is located in the same layer as the pair of electrode layers 11. The third coil conductor 24 is separated from the pair of electrode layers 11 located in the same layer. The other end of the second coil conductor 23 and one end of the third coil conductor 24 are adjacent to each other in the first direction D1 and are directly connected to each other. When viewed from the first direction D1, the other end of the second coil conductor 23 and one end of the third coil conductor 24 overlap each other.

[0050] The fourth coil conductor 25 is located in the same layer as the pair of electrode layers 11. The fourth coil conductor 25 is connected to the layer portion 11a of the one electrode layer 11 located in the same layer via the connecting conductor 27. The connecting conductor 27 is located in the same layer as the pair of electrode layers 11 and the fourth coil conductor 25. The connecting conductor 27 connects the fourth coil conductor 25 and the layer portion 11a of the one electrode layer 11. The other end of the fourth coil conductor 25 is connected to the connecting conductor 27. The other end of the fourth coil conductor 25 constitutes the other end 10a of the coil 10. In the present embodiment, the fourth coil conductor 25, the connecting conductor 27, and the layer portion 11a of the one electrode layer 11 are formed integrally.

[0051] For example Figure 5 As shown, the connection conductor 27 is connected to the main surface 2d side of the center of the third direction D3 of the layer part 11a (electrode part 4). When viewed from the first direction D1, the connection conductor 27 has a predetermined width. Specifically, the center of the width direction of the connection conductor 27 is connected to the main surface 2d side of the center of the third direction D3 of the layer part 11a. When viewed from the first direction D1, the connection conductor 27 can be connected to the main surface 2d side of the center of the third direction D3 of the layer part 11a in more than half of the width direction of the connection conductor 27, or it can be connected to the main surface 2c side of the center of the third direction D3 of the layer part 11a in a part of the width direction. The connection conductor 27 extends from the connection part of the layer part 11a (electrode part 4) along the third direction D3 toward the main surface 2d side. The connection conductor 27 is linear and tilted toward the inner side of the substrate 2 relative to the third direction D3. In addition, the connection conductor 27 can also be connected to the fourth coil conductor 25 and the layer part 11b (electrode part 5).

[0052] The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, and the connecting conductors 26 and 27 contain a conductive material. The conductive material contains, for example, Ag or Pd. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, and the connecting conductors 26 and 27 are formed as a sintered body of a conductive paste containing a conductive material powder. The conductive material powder contains, for example, Ag powder or Pd powder.

[0053] In the present embodiment, the first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, and the connecting conductors 26 and 27 include the same conductive material as the terminal electrodes 3. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, and the connecting conductors 26 and 27 may also include a conductive material different from that of the terminal electrodes 3.

[0054] The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, and the connecting conductors 26 and 27 are provided in the defective portion formed in the corresponding insulating layer 6. The first coil conductor 22, the second coil conductor 23, the third coil conductor 24, the fourth coil conductor 25, and the connecting conductors 26 and 27 are formed by firing the conductive paste located in the defective portion formed in the green sheet.

[0055] The defective portion formed on the raw sheet is formed, for example, by the following process. First, the raw sheet is formed by applying the constituent material of the insulating layer 6 and the matrix slurry containing the photosensitive material to the substrate. The substrate is, for example, a PET film. The photosensitive material contained in the matrix slurry can also be any of negative and positive types, and known materials can be used. Next, using a mask corresponding to the defective portion, the raw sheet is exposed and developed by photolithography to form the defective portion on the raw sheet on the substrate. The raw sheet with the defective portion formed is a matrix pattern.

[0056] The electrode layer 11 , the first coil conductor 22 , the second coil conductor 23 , the third coil conductor 24 , the fourth coil conductor 25 , and the connection conductors 26 and 27 are formed, for example, by the following process.

[0057] First, a conductive material layer is formed by applying a conductive paste containing a photosensitive material to 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, and a conductive pattern corresponding to the shape of the defective portion is formed on the substrate.

[0058] The laminated coil component 1 is obtained, for example, by the following process following the above process. By combining the defective portion of the conductor pattern and the base pattern, a sheet having the base pattern and the conductor pattern as the same layer is prepared. After heat-treating the laminated body obtained by laminating a predetermined number of sheets prepared, a plurality of green chips are obtained from the laminated body. In this process, for example, the green laminated body is cut into a chip shape using a cutting machine. Thus, a plurality of green chips of a predetermined size are obtained. Then, the green chips are fired. The laminated coil component 1 is obtained by the firing. A plating layer can also be formed on the surface of each terminal electrode 3. The plating layer is formed, for example, by electrolytic plating or electroless plating. The plating layer contains, for example, Ni, Sn, or Au.

[0059] As described above, in the laminated coil component 1 of the present embodiment, the exposed surface 4a of the electrode portion 4 is separated from the outer edge 2g of the end surface 2a, and the exposed surface 5a of the electrode portion 5 is separated from the outer edge 2h of the main surface 2c. That is, the entire exposed surface 4a is surrounded by the end surface 2a, and the entire exposed surface 5a is surrounded by the main surface 2c. Therefore, compared with the case where the terminal electrode 3 is continuously formed over the end surface 2a and the main surface 2c, the area where the electrode portions 4 and 5 contact the substrate 2 becomes larger. Therefore, the bonding force between the terminal electrode 3 (i.e., the electrode portions 4 and 5) and the substrate 2 increases, so that the terminal electrode 3 is prevented from peeling off from the substrate 2.

[0060] For example, in order to inspect the characteristics of the laminated coil component 1, a test needle may be pressed against the exposed surface 5a of the terminal electrode 3. In the laminated coil component 1, since the bonding force between the terminal electrode 3 and the substrate 2 is increased, the substrate 2 of the terminal electrode 3 is prevented from peeling off even under such external stress.

[0061] The inspection needle sometimes protrudes from the exposed surface 5a and is pressed against a portion of the main surface 2c adjacent to the short side of the exposed surface 5a. Figure 2B As shown, the portion of the main surface 2c adjacent to the short side of the exposed surface 5a is composed of an insulator layer 6 located at the stacking end. Here, as a comparative example, a stacked coil component in which the long side of the exposed surface 5a coincides with the outer edge 2h is considered. In the stacked coil component of this comparative example, the insulator layer 6 located at the stacking end is bonded to the adjacent insulator layer 6 only in the central part of the second direction D2 (the part between a pair of electrode parts 5) in the area near the main surface 2c. The bonding force between the insulator layer 6 and the terminal electrode 3 is weaker than the bonding force between the insulator layers 6. Therefore, when the inspection needle is pressed on the portion of the main surface 2c adjacent to the short side of the exposed surface 5a, the insulator layer 6 located at the stacking end will peel off.

[0062] In contrast, in the present embodiment, the insulating layer 6 at the stacking end is bonded to the adjacent insulating layer 6 not only in the central portion in the second direction D2 (the portion between the pair of electrode portions 5) but also in both ends in the second direction D2 (the portions outside the pair of electrode portions 5) near the main surface 2c. Therefore, even when the inspection needle presses the portion of the main surface 2c adjacent to the short side of the exposed surface 5a, the peeling of the insulating layer 6 at the stacking end can be suppressed.

[0063] As another comparative example, a laminated coil component in which the long side of the exposed surface 4a coincides with the outer edge 2h (the outer edge 2h on the main surface 2c side) is considered. In the laminated coil component of the other comparative example, the electrode portion 4 is easily exposed on the main surface 2c. When the inspection needle is pressed on the exposed portion of the electrode portion 4 on the main surface 2c, the electrode portion 4 is peeled off.

[0064] In contrast, in this embodiment, the exposed surface 4a is separated from the outer edge 2h and is not exposed on the main surface 2c. Therefore, the inspection needle pressed on the main surface 2c does not press on the electrode part 4. Therefore, the peeling of the electrode part 4 is suppressed.

[0065] The pair of side surfaces 4c are curved. Therefore, the side surface 4c and the opposing surface 4b are smoothly connected to each other. Therefore, cracks in the base 2 caused by the corner formed by the side surface 4c and the opposing surface 4b are suppressed. The pair of side surfaces 5c are curved. Therefore, the side surface 5c and the opposing surface 5b are smoothly connected to each other. Therefore, cracks in the base 2 caused by the corner formed by the side surface 5c and the opposing surface 5b are suppressed.

[0066] The connection conductors 26 and 27 are connected to the main surface 2d side from the center of the electrode portion 4 in the third direction D3 and extend toward the main surface 2d side. Therefore, compared with the case where the connection conductors 26 and 27 are connected to the main surface 2c side from the center of the electrode portion 4 in the third direction D3 and extend toward the main surface 2d side, or connected to the main surface 2d side from the center of the electrode portion 4 in the third direction D3 and extend toward the main surface 2c side, the area in the electrode portion 4 that is opposed to the connection conductors 26 and 27 via the substrate 2 in the second direction D2 is reduced. As a result, the stray capacitance formed between the electrode portion 4 and the connection conductors 26 and 27 can be suppressed.

[0067] In a structure where the electrode parts 4 and 5 are not electrically connected in the substrate 2, for example, when the laminated coil part 1 is welded and mounted on the mounting substrate, and the electrode parts 4 and 5 are electrically connected to each other outside the substrate 2, the electrical paths between the electrode parts 4 and 5 are two, one inside and one outside the substrate 2, which may have an adverse effect on the electrical characteristics. In contrast, in the present embodiment, the electrode parts 4 and 5 are electrically insulated from each other in the substrate 2. Thus, since there is only one current path between the electrode parts 4 and 5, the effect on the electrical characteristics can be suppressed. In addition, since the electrode parts 4 and 5 are formed separately, the amount of shrinkage during firing can be suppressed compared to the case where the electrode parts 4 and 5 are formed as one body.

[0068] The coil 10 has a coil axis AX along the first direction D1. Therefore, a magnetic flux along the first direction D1 is generated. The terminal electrode 3 is provided on the main surface 2c and the end surface 2a extending along the first direction D1, and is not provided on the side surface 2e intersecting the first direction D1. Therefore, compared with the case where the terminal electrode 3 is provided on the side surface 2e, the magnetic flux intersecting the terminal electrode 3 is reduced. Therefore, the Q value can be improved.

[0069] As mentioned above, although embodiment of this invention was described, this invention is not necessarily limited to the said embodiment, Various changes can be made without departing from the range which concerns on this invention.

[0070] like Fig. 6A and Figure 6B As shown, the laminated coil component 1A of the modified example is different from the laminated coil component 1 of the embodiment mainly in the shape of the terminal electrode 3. In the laminated coil component 1A, the ends 4e and 5e of the electrode parts 4 and 5 are in a concave-convex shape. Specifically, the end 4e of the electrode part 4 in the third direction D3 (including the long side of the exposed surface 4a) and the end 5e of the electrode part 5 in the second direction D2 (including the long side of the exposed surface 5a) are respectively in a concave-convex shape. Both ends 4e of the electrode part 4 in the third direction D3 may also be in a concave-convex shape, and one end 4e may also have a concave-convex shape. Both ends 5e of the electrode part 5 in the second direction D2 may also be in a concave-convex shape, and one end 5e may also have a concave-convex shape. The laminated coil component 1A is formed by alternately stacking layers having layer parts 11a and 11b with long extension lengths corresponding to the convex parts and layers having layer parts 11a and 11b with short extension lengths corresponding to the concave parts.

[0071] In the laminated coil component 1A, the exposed surface 4a is also separated from the outer edge 2g of the end surface 2a, and the exposed surface 5a is separated from the outer edge 2h of the main surface 2c. Therefore, the terminal electrode 3 is suppressed from peeling off. In addition, since the end portions 4e and 5e of the electrode portions 4 and 5 have a concave-convex shape, the adhesive force between the electrode portions 4 and 5 and the substrate 2 is increased. Therefore, the terminal electrode 3 is further suppressed from peeling off.

[0072] In the above embodiment, the coil 10 has been described as an example in which it includes the first coil conductor 22, the second coil conductor 23, the third coil conductor 24, and the fourth coil conductor 25. However, the number of coil conductors constituting the coil 10 is not limited to four.

[0073] In the above embodiment, the exposed surface 4a is roughly aligned with the end surface 2a, but the exposed surface 4a may protrude from the end surface 2a or may be recessed from the end surface 2a. The exposed surface 5a is roughly aligned with the main surface 2c, and the exposed surface 5a may protrude from the main surface 2c or may be recessed from the main surface 2c. The exposed surfaces 4a and 5a are not limited to flat surfaces, but may also be curved surfaces.

[0074] The electrode portions 4 and 5 may be electrically connected to each other in the base body 2. In this case, the plated film may be formed by electroplating.

Claims

1. A laminated coil component comprising: a substrate having a plurality of insulator layers stacked in a first direction; a coil disposed within the base; and a terminal electrode disposed on the substrate, The base is in a rectangular parallelepiped shape, and has a first side surface and a second side surface facing each other in the first direction, a first end surface and a second end surface facing each other in a second direction intersecting the first direction, and a first main surface and a second main surface facing each other in a third direction intersecting the first direction and the second direction. The terminal electrode is embedded in the substrate and has two electrode portions: a first electrode portion exposed at the first main surface and a second electrode portion exposed at the first end surface. The first exposed surface of the first electrode portion exposed on the first main surface is the only exposed surface exposed on the first main surface. The second exposed surface of the second electrode portion exposed at the first end surface is the only exposed surface exposed at the first end surface, The first exposed surface and the second exposed surface are adjacent to each other via a ridgeline between the first main surface and the first end surface of the substrate. The first exposed surface is separated from the outer edge of the first main surface, The second exposed surface is separated from the outer edge of the first end surface, The terminal electrodes are not exposed at the ridge line portion.

2. The laminated coil component according to claim 1, wherein: The coil has a coil axis along the first direction.

3. The laminated coil component according to claim 1 or 2, wherein: further comprising a connecting conductor connecting an end of the coil and the second electrode portion, The connection conductor is connected to the second main surface side relative to the center of the second electrode portion in the third direction, and extends toward the second main surface side.

4. The laminated coil component according to any one of claims 1 to 3, wherein The first electrode portion includes a first opposing surface opposing the first exposed surface, and a pair of third side surfaces connecting the first exposed surface and the first opposing surface and opposing each other in the second direction. The pair of third side surfaces are respectively bent.

5. The laminated coil component according to any one of claims 1 to 4, wherein The second electrode portion includes a second opposing surface opposing the second exposed surface, and a pair of fourth side surfaces connecting the second exposed surface and the second opposing surface and opposing each other in the third direction. The pair of fourth side surfaces are respectively bent.

6. The laminated coil component according to any one of claims 1 to 5, wherein The first electrode portion and the second electrode portion are not electrically connected to each other within the substrate.

7. The laminated coil component according to any one of claims 1 to 6, wherein An end portion of the first electrode portion in the third direction has a concavo-convex shape.

8. The laminated coil component according to any one of claims 1 to 7, wherein An end portion of the second electrode portion in the second direction has a concavo-convex shape.

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