Coil components
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- TDK CORP
- Filing Date
- 2025-01-24
- Publication Date
- 2026-08-05
Smart Images
Figure 2026126857000001_ABST
Abstract
Description
Technical Field
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[0001] The present invention relates to a coil component.
Background Art
[0002] Known coil components include a body, a coil disposed within the body, and a terminal electrode disposed on one main surface of the body and electrically connected to the coil (see, for example, Patent Document 1).
Prior Art Documents
Patent Documents
[0008] According to one aspect of the present invention, a coil component capable of improving mounting strength is provided. [Brief explanation of the drawing]
[0009] [Figure 1] Figure 1 is a perspective view of a coil component according to the first embodiment. [Figure 2] Figure 2 is a bottom view of the coil component shown in Figure 1. [Figure 3] Figure 3 is a plan view of the mounting surface of another electronic device on which the coil component shown in Figure 1 is mounted. [Figure 4] Figure 4 is a bottom view of the coil component relating to the comparative example. [Figure 5] Figure 5 is a bottom view of the coil component according to the second embodiment. [Figure 6]Figure 6 is a bottom view of the coil component according to the third embodiment. [Figure 7] Figure 7 is a bottom view of the coil component according to the fourth embodiment. [Figure 8] Figure 8 is a bottom view of the coil component according to the fifth embodiment. [Figure 9] Figure 9 is a bottom view of the coil component according to the sixth embodiment. [Figure 10] Figure 10 is a bottom view of the coil component according to the seventh embodiment. [Modes for carrying out the invention]
[0010] Embodiments of the present invention will be described in detail below with reference to the attached drawings. In the description of the drawings, the same or equivalent elements will be denoted by the same reference numerals, and redundant descriptions will be omitted. [First Embodiment] The coil component according to the first embodiment will be described with reference to Figure 1. Figure 1 is a perspective view of the coil component according to the first embodiment. Figure 2 is a bottom view of the coil component shown in Figure 1. As shown in Figures 1 and 2, the coil component 1 comprises a base body 2, a coil 5, and a mounting conductor. In Figure 1, the base body 2 is shown with a solid line, and the internal structure of the base body 2 is shown with a dashed line.
[0011] Body 2 has a rectangular parallelepiped shape. The rectangular parallelepiped shape includes a rectangular parallelepiped with chamfered corners and edges, and a rectangular parallelepiped with rounded corners and edges. Body 2 has a pair of end faces 2a and 2b, a pair of main faces 2c (first main face) and 2d (second main face), and a pair of side faces 2e and 2f as its outer surfaces. The end faces 2a and 2b face each other. The main faces 2c and 2d face each other. The side faces 2e and 2f face each other. Hereinafter, the opposing direction of the end faces 2a and 2b will be referred to as the first direction D1, the opposing direction of the main faces 2c and 2d as the second direction D2, and the opposing direction of the side faces 2e and 2f as the third direction D3. The first direction D1, the second direction D2, and the third direction D3 are approximately orthogonal to each other.
[0012] The end faces 2a, 2b extend in the second direction D2 so as to connect the main faces 2c, 2d. The end faces 2a, 2b also extend in the third direction D3 so as to connect the side faces 2e, 2f. The main faces 2c, 2d extend in the first direction D1 so as to connect the end faces 2a, 2b. The main faces 2c, 2d also extend in the third direction D3 so as to connect the side faces 2e, 2f. The side faces 2e, 2f extend in the first direction D1 so as to connect the end faces 2a, 2b. The side faces 2e, 2f also extend in the second direction D2 so as to connect the main faces 2c, 2d.
[0013] The main face 2c is a mounting face, for example, when mounting the coil component 1 on another electronic device (for example, a circuit substrate or a coil component), it is the face facing the other electronic device. The end faces 2a, 2b and the side faces 2e, 2f are faces continuous from the mounting face (that is, the main face 2c).
[0014] As shown in FIGS. 1 and 2, the length of the element body 2 in the first direction D1 is longer than the length of the element body 2 in the second direction D2 and the length of the element body 2 in the third direction D3. The length of the element body 2 in the second direction D2 is shorter than the length of the element body 2 in the third direction D3. That is, in the present embodiment, the end faces 2a, 2b, the main faces 2c, 2d, and the side faces 2e, 2f exhibit a rectangular shape. The length of the element body 2 in the second direction D2 may be equal to the length of the element body 2 in the third direction D3, or may be longer than the length of the element body 2 in the third direction D3.
[0015] In addition, in the present embodiment, "equal" may include values with slight differences or manufacturing errors within a preset range in addition to being equal. For example, if a plurality of values are included within the range of ±5% of the average value of the plurality of values, the plurality of values are defined as being equal.
[0016] The element body 2 is formed by laminating a plurality of element layers (insulator layers) in the second direction D2. That is, the lamination direction of the element body 2 is the second direction D2. In the actual element body 2, the plurality of element layers may be integrated to such an extent that the boundaries between the layers are not visible, or may be integrated so that the boundaries between the layers are visible.
[0017] The base layer may be, for example, a resin layer. The material of the base layer includes, for example, at least one selected from liquid crystal polymers, polyimide resins, crystalline polystyrenes, epoxy resins, acrylic resins, bismaleimide resins, and fluorine-based resins. The base layer may contain a filler. The filler may be, for example, an inorganic filler. Examples of the inorganic filler include silica (SiO2). Note that the base layer may not contain a filler.
[0018] Note that the base layer may be configured to contain a magnetic material. The magnetic material of the base layer includes, for example, a Ni-Cu-Zn-based ferrite material, a Ni-Cu-Zn-Mg-based ferrite material, or a Ni-Cu-based ferrite material. The magnetic material of the base layer may include, for example, an Fe alloy. The base layer may include, for example, a non-magnetic material. The non-magnetic material of the base layer includes, for example, a glass ceramic material or a dielectric material.
[0019] As shown in FIG. 2, the main surface 2c has a first region R1, a second region R2, a third region R3, and a fourth region R4 that are quadrisected by a first virtual line A and a second virtual line B. The first virtual line A is a virtual straight line along the first direction D1. The second virtual line B is a virtual straight line along the third direction D3. The first virtual line A and the second virtual line B are orthogonal to each other. The intersection of the first virtual line A and the second virtual line B coincides with the centroid of the main surface 2c. The first region R1 and the second region R2 are provided diagonally. The third region R3 and the fourth region R4 are provided diagonally.
[0020] The first region R1, the second region R2, the third region R3, and the fourth region R4 have the same rectangular shape as each other. The first region R1 is arranged adjacent to the end face 2a and the side face 2e. The second region R2 is arranged adjacent to the end face 2b and the side face 2f. The third region R3 is arranged adjacent to the end face 2a and the side face 2f. The fourth region R4 is arranged adjacent to the end face 2b and the side face 2e.
[0021] The mounting conductor for coil component 1 is a conductor for mounting coil component 1 to other electronic devices. More specifically, the mounting conductor is a conductor that is joined (fixed) to the land electrodes of other electronic devices when coil component 1 is mounted to other electronic devices, for example, by soldering. The mounting conductor has a first conductor portion 10 located in the first region R1, a second conductor portion 20 located in the second region R2, a third conductor portion 30 located in the third region R3, and a fourth conductor portion 40 located in the fourth region R4.
[0022] The mounting conductors are not provided on the pair of end faces 2a, 2b, the main surface 2d, or the pair of side surfaces 2e, 2f. That is, the mounting conductors consist only of the first conductor section 10, the second conductor section 20, the third conductor section 30, and the fourth conductor section 40. When viewed from a direction perpendicular to the main surface 2c (second direction D2), the mounting conductors are spaced apart from the pair of end faces 2a, 2b and the pair of side surfaces 2e, 2f. No conductors other than the mounting conductors are provided on the outer surface of the coil component 1.
[0023] The mounting conductor is embedded in the base body 2 so as to be exposed from the main surface 2c. It can also be said that the mounting conductor is positioned within a recess provided in the main surface 2c. The mounting conductor has an exposed surface that is exposed from the main surface 2c. When viewed from a direction perpendicular to the main surface 2c (second direction D2), the shape of the mounting conductor matches the shape of the exposed surface of the mounting conductor. The mounting conductor does not protrude from the main surface 2c. That is, in this embodiment, the exposed surface of the mounting conductor is flush with the main surface 2c.
[0024] The mounting conductor is made of a conductive material (for example, Cu). The mounting conductor is made entirely of the same material, but may be made partially of different materials. The mounting conductor may be provided with a plating layer (not shown) containing, for example, Ni, Sn, Au, etc., by electroplating or electroless plating. The plating layer may have, for example, a Ni plating film containing Ni that covers the mounting conductor, and an Au plating film containing Au that covers the Ni plating film.
[0025] In this embodiment, the first conductor portion 10 includes a connecting electrode 11 and a dummy electrode 12 spaced apart from each other. The second conductor portion 20 includes a connecting electrode 21 and a dummy electrode 22 spaced apart from each other. The third conductor portion 30 includes a dummy electrode 31. The fourth conductor portion 40 includes a dummy electrode 41.
[0026] The connecting electrode 11 is connected to the first end 7 of the coil 5. The connecting electrode 21 is connected to the second end 8 of the coil 5. The connecting electrodes 11 and 21 are spaced apart from each other in the first direction D1 and the third direction D3. The connecting electrodes 11 and 21 are arranged so as not to overlap when viewed from the first direction D1 and the third direction D3. The connecting electrode 11 is positioned closer to the end face 2a and the side surface 2e. The connecting electrode 21 is positioned closer to the end face 2b and the side surface 2f.
[0027] Viewed from the second direction D2, each of the connecting electrodes 11 and 21 has, for example, a rectangular shape. Viewed from the second direction D2, each of the connecting electrodes 11 and 21 is positioned so that each side aligns with the first direction D1 or the third direction D3. Viewed from the second direction D2, the connecting electrodes 11 and 21 have the same rectangular shape as each other. Viewed from the second direction D2, the connecting electrodes 11 and 21 are positioned so as to be point-symmetric with respect to the centroid of the main surface 2c (i.e., the intersection of the first virtual line A and the second virtual line B). Each of the connecting electrodes 11 and 21 is positioned away from the first virtual line A and the second virtual line B.
[0028] The dummy electrodes 12, 22, 31, and 41 form a single dummy electrode 50 that is integrally formed with each other. Specifically, dummy electrode 12 is the portion of the dummy electrode 50 located in the first region R1. Dummy electrode 22 is the portion of the dummy electrode 50 located in the second region R2. Dummy electrode 31 is the portion of the dummy electrode 50 located in the third region R3. Dummy electrode 41 is the portion of the dummy electrode 50 located in the fourth region R4. In the dummy electrode 50, dummy electrodes 12, 22, 31, and 41 are connected to each other. The dummy electrode 50 is not electrically or physically connected to the coil 5.
[0029] Viewed from the second direction D2, the dummy electrodes 12 and 22 are identical rectangular in shape, with the third direction D3 as the longer side. Viewed from the second direction D2, the dummy electrodes 12 and 22 are arranged so as to be point-symmetric with respect to the centroid of the main surface 2c. Viewed from the second direction D2, the dummy electrodes 31 and 41 are identical L-shaped in shape. Viewed from the second direction D2, the dummy electrodes 31 and 41 are arranged so as to be point-symmetric with respect to the centroid of the main surface 2c.
[0030] Viewed from the second direction D2, the dummy electrode 50 has a polygonal shape. Viewed from the second direction D2, the dummy electrode 50 has a roughly Z-shape and has three straight sections 50a, 50b, and 50c. Straight section 50a is located closer to the side surface 2e than the first virtual line A and extends along the first direction D1. Straight section 50b is located closer to the side surface 2f than the first virtual line A and extends along the first direction D1. Straight section 50c is located in the center of the main surface 2c in the first direction D1 and extends along the third direction D3 to connect the straight sections 50a and 50b. Viewed from the second direction D2, the line width of straight section 50c is thicker than that of each straight section 50a and 50b. That is, the length of straight section 50c in the first direction D1 is longer than the length of each straight section 50a and 50b in the third direction D3. The dummy electrode 50 is separated from the connecting electrodes 11 and 21.
[0031] Viewed from the second direction D2, the sum of the areas of the third conductor section 30 and the fourth conductor section 40 is greater than the sum of the areas of the first conductor section 10 and the second conductor section 20. Here, the area of the first conductor section 10 is the sum of the area of the connecting electrode 11 and the area of the dummy electrode 12. The area of the second conductor section 20 is the sum of the area of the connecting electrode 21 and the area of the dummy electrode 22. The area of the third conductor section 30 is the area of the dummy electrode 31. The area of the fourth conductor section 40 is the area of the dummy electrode 41.
[0032] Viewed from the second direction D2, the area of the third conductor section 30 is larger than the area of the first conductor section 10. Viewed from the second direction D2, the area of the third conductor section 30 is larger than the area of the second conductor section 20. Viewed from the second direction D2, the area of the fourth conductor section 40 is larger than the area of the first conductor section 10. Viewed from the second direction D2, the area of the fourth conductor section 40 is larger than the area of the second conductor section 20. In this embodiment, viewed from the second direction D2, the areas of the first conductor section 10 and the second conductor section 20 are equal. Viewed from the second direction D2, the areas of the third conductor section 30 and the fourth conductor section 40 are equal.
[0033] The sum of the length L3 of the third conductor section 30 along the first direction D1 and the length L4 of the fourth conductor section 40 along the first direction D1 is longer than the sum of the length L1 of the first conductor section 10 along the first direction D1 and the length L2 of the second conductor section 20 along the first direction D1 (L3 + L4 > L1 + L2). Here, length L1 is the sum of the length L11 of the connecting electrode 11 along the first direction D1 and the length L12 of the dummy electrode 12 along the first direction D1 (L1 = L11 + L12). Length L2 is the sum of the length L21 of the connecting electrode 21 along the first direction D1 and the length L22 of the dummy electrode 22 along the first direction D1 (L2 = L21 + L22). Length L3 is the length of the dummy electrode 31 along the first direction D1. Length L4 is the length of the dummy electrode 41 along the first direction D1.
[0034] Length L3 is longer than length L1 (L3>L1). Length L3 is longer than length L2 (L3>L2). Length L4 is longer than length L1 (L4>L1). Length L4 is longer than length L2 (L4>L2). In this embodiment, lengths L1 and L2 are equivalent to each other. Lengths L3 and L4 are equivalent to each other.
[0035] As shown in Figure 1, coil 5 is located inside the substrate 2. The coil axis of coil 5 is aligned along the third direction D3. Coil 5 is made of a conductive material (for example, Cu). Coil 5 is located away from the outer surface of the substrate 2. Coil 5 is not exposed to the outer surface of the substrate 2.
[0036] As shown in Figures 1 and 2, the first end 7 of coil 5 is connected to the connecting electrode 11. The first end 7 of coil 5 is positioned near the end face 2a and near the side surface 2e. The second end 8 of coil 5 is connected to the connecting electrode 21. The second end 8 of coil 5 is positioned near the end face 2b and near the side surface 2f. In Figure 2, the first end 7 and the second end 8 of coil 5 are shown with dashed lines. Viewed from the second direction D2, the first end 7 of coil 5 overlaps with the connecting electrode 11. Viewed from the second direction D2, the second end 8 of coil 5 overlaps with the connecting electrode 21.
[0037] Figure 3 is a plan view of another electronic device on which the coil component of Figure 1 is mounted. As shown in Figure 3, the other electronic device 60 comprises a substrate 61, land electrodes 62, and circuit patterns 63, 64. The land electrodes 62 and circuit patterns 63, 64 are arranged on the substrate 61. The land electrodes 62 have a configuration corresponding to the mounting conductor of the coil component 1 shown in Figure 2. That is, the land electrodes 62 have an electrode portion 62a corresponding to the connecting electrode 11, an electrode portion 62b corresponding to the connecting electrode 21, and an electrode portion 62c corresponding to the dummy electrode 50. In plan view, the connecting electrode 11 and electrode portion 62a have the same shape as each other. In plan view, the connecting electrode 21 and electrode portion 62b have the same shape as each other. In plan view, the dummy electrode 50 and electrode portion 62c have the same shape as each other. In Figure 3, the outline of the mounted coil component 1 is shown by a dashed line.
[0038] Circuit pattern 63 is connected to electrode portion 62a. Circuit pattern 64 is connected to electrode portion 62b. The coil component 1 is mounted on another electronic device 60 with its main surface 2c and substrate 61 facing each other in the second direction D2, and with the connecting electrodes 11, 21 and dummy electrode 50 aligned to overlap with the electrode portions 62a, 62b, and 62c, respectively, when viewed from the second direction D2.
[0039] Figure 4 is a bottom view of a coil component according to a comparative example. Coil component 100 according to the comparative example differs from coil component 1 in that it has only a pair of connecting electrodes 101 and 102 as mounting conductors. Coil component 100 has a base body 2 and a coil 5 (see Figure 1) similar to coil component 1. The pair of connecting electrodes 101 and 102 have the same shape and are arranged on the main surface 2c. Connecting electrode 101 is connected to the first end 7 of the coil 5. Connecting electrode 102 is connected to the second end 8 of the coil 5. The pair of connecting electrodes 101 and 102 are separated from each other in the first direction D1. Connecting electrode 101 is positioned closer to end face 2a, and connecting electrode 102 is positioned closer to end face 2b.
[0040] The inventors have conducted extensive research and obtained the following findings. Specifically, in a bonding strength test in which an external force is applied to the side surface 2e or side surface 2f along the third direction D3 while the coil component 100 is mounted on another electronic device, the coil component 100 tends to rotate around the connection point between the connecting electrode 101 or connecting electrode 102 and the coil 5 as an axis, rather than moving parallel to the third direction D3 when detached from the other electronic device.
[0041] In detail, when an external force is applied to the side surface 2e, the coil component 100 easily rotates around the connection point between the connecting electrode 101 and the first end 7 of the coil 5 as its axis. Similarly, when an external force is applied to the side surface 2f, the coil component 100 easily rotates around the connection point between the connecting electrode 102 and the second end 8 of the coil as its axis. This is because the bonding strength between the connecting electrodes 101 and 102 and the base body 2 is strong at the connection points between the connecting electrodes 101 and 102 and the coil 5, whereas the bonding strength is weaker at other parts of the connecting electrodes 101 and 102.
[0042] Therefore, the coil component 1 incorporates ingenuity in the shape and arrangement of the mounting conductors. Specifically, when viewed from the second direction D2, the total area of the third conductor section 30 and the fourth conductor section 40, to which the coil 5 is not connected, is larger than the total area of the first conductor section 10 and the second conductor section 20, to which the coil 5 is connected. This area relationship of the mounting conductors improves the insufficient bonding strength between the third conductor section 30 and the fourth conductor section 40 and the base body 2, which is caused by the absence of the coil 5. As a result, the mounting strength of the coil component 1 to other electronic devices 60 is improved in a balanced manner, and the detachment of the coil component 1 from other electronic devices 60 is suppressed.
[0043] Viewed from the second direction D2, the area of the third conductor portion 30, to which the coil 5 is not connected, is larger than the area of the first conductor portion 10, to which the coil 5 is connected. Viewed from the second direction D2, the area of the fourth conductor portion 40, to which the coil 5 is not connected, is larger than the area of the second conductor portion 20, to which the coil 5 is connected. The first region R1 and the third region R3 are located on opposite sides of the first virtual line A, and the second region R2 and the fourth region R4 are located on opposite sides of the first virtual line A. This area relationship of the mounting conductors can reliably improve the insufficient bonding strength between the third conductor portion 30 and the fourth conductor portion 40 and the base body 2. As a result, the mounting strength of the coil component 1 to other electronic devices 60 can be improved in a balanced manner, and the detachment of the coil component 1 from other electronic devices 60 can be more effectively suppressed. In particular, when an external force is applied to the end face 2a or end face 2b along the first direction D1, the rotation of the coil component 1 can be effectively suppressed.
[0044] Viewed from the second direction D2, the area of the fourth conductor section 40, to which coil 5 is not connected, is larger than the area of the first conductor section 10, to which coil 5 is connected. Viewed from the second direction D2, the area of the third conductor section 30, to which coil 5 is not connected, is larger than the area of the second conductor section 20, to which coil 5 is connected. The first region R1 and the fourth region R4 are located on opposite sides of the second virtual line B, and the second region R2 and the third region R3 are located on opposite sides of the second virtual line B. This area relationship of the mounting conductors can reliably improve the insufficient bonding strength between the third conductor section 30 and the fourth conductor section 40 and the base body 2. As a result, the mounting strength of the coil component 1 to other electronic devices 60 can be improved in a balanced manner, and the detachment of the coil component 1 from other electronic devices 60 can be more effectively suppressed. In particular, when an external force is applied to the side surface 2e or side surface 2f along the third direction D3, the rotation of the coil component 1 can be effectively suppressed.
[0045] The first conductor portion 10 includes a dummy electrode 12, and the second conductor portion 20 includes a dummy electrode 22. In the dummy electrode 50, dummy electrodes 12, 22, 31, and 41 are connected to each other. Thus, since the dummy electrode 50 is arranged not only in the third region R3 and the fourth region R4 but also in the first region R1 and the second region R2, the contact area between the mounting conductor of the coil component 1 and other electronic devices 60 can be increased. Therefore, the mounting strength of the coil component 1 against other electronic devices 60 can be further improved.
[0046] The combined lengths L3 and L4 of the third conductor section 30 and the fourth conductor section 40, to which coil 5 is not connected, are longer than the combined lengths L1 and L2 of the first conductor section 10 and the second conductor section 20, to which coil 5 is connected. This length relationship of the mounting conductors improves the insufficient bonding strength between the third conductor section 30 and the fourth conductor section 40 and the base body 2, which is caused by the absence of coil 5. As a result, the mounting strength of the coil component 1 to other electronic devices 60 is improved in a balanced manner, and the detachment of the coil component 1 from other electronic devices 60 is suppressed.
[0047] Length L3 is longer than length L1. Length L4 is longer than length L2. This length relationship of the mounting conductors can reliably improve the insufficient bonding strength between the third conductor portion 30 and the fourth conductor portion 40 and the base body 2. As a result, the mounting strength of the coil component 1 to other electronic devices 60 can be improved in a balanced manner, and the detachment of the coil component 1 from other electronic devices 60 can be more effectively suppressed. In particular, when an external force is applied to the end face 2a or end face 2b along the first direction D1, the rotation of the coil component 1 can be effectively suppressed.
[0048] Length L4 is longer than length L1. Length L3 is longer than length L2. This length relationship of the mounting conductors can reliably improve the insufficient bonding strength between the third conductor portion 30 and the fourth conductor portion 40 and the base body 2. As a result, the mounting strength of the coil component 1 to other electronic devices 60 can be improved in a balanced manner, and the detachment of the coil component 1 from other electronic devices 60 can be more effectively suppressed. In particular, when an external force is applied to the side surface 2e or side surface 2f along the third direction D3, the rotation of the coil component 1 can be effectively suppressed.
[0049] [Second Embodiment] Figure 5 is a bottom view of the coil component according to the second embodiment. As shown in Figure 5, the coil component 1A according to the second embodiment differs from the coil component 1 according to the first embodiment in terms of the shape of the dummy electrode 50. In the following description, explanations of the similarities between coil component 1A and coil component 1 will be omitted as appropriate. In coil component 1A, the straight portion 50c of the dummy electrode 50 extends inclined with respect to the second imaginary line B when viewed from the second direction D2. The connection between the straight portion 50c and the straight portion 50a is located in the third region R3 and not in the second region R2. The connection between the straight portion 50c and the straight portion 50b is located in the fourth region R4 and not in the first region R1. When viewed from the second direction D2, the dummy electrodes 12 and 22 have the same triangular shape.
[0050] In coil component 1A, the lengths of the dummy electrode 12, dummy electrode 22, third conductor portion 30, and fourth conductor portion 40 along the first direction D1 vary depending on the position in the third direction D3. Therefore, length L12 is defined as the maximum length of the dummy electrode 12 along the first direction D1. Length L22 is defined as the maximum length of the dummy electrode 22 along the first direction D1. Length L3 is defined as the maximum length of the third conductor portion 30 along the first direction D1. Length L4 is defined as the maximum length of the fourth conductor portion 40 along the first direction D1.
[0051] In coil component 1A, the sum of the area of the third conductor section 30 and the area of the fourth conductor section 40 is greater than the sum of the area of the first conductor section 10 and the area of the second conductor section 20, so the same effect as coil component 1 is obtained. Also, the sum of lengths L3 and L4 is longer than the sum of lengths L1 and L2, so the same effect as coil component 1 is obtained.
[0052] In coil component 1A, the straight portion 50c of the dummy electrode 50 is inclined with respect to the second virtual line B. Therefore, when viewed from the second direction D2, the area in which the dummy electrode 50 overlaps with the coil 5 is smaller than in the case of coil component 1. Consequently, in coil component 1A, the influence of the stray capacitance generated between the dummy electrode 50 and the coil 5 on coil component 1A is smaller than in the case of coil component 1.
[0053] [Third Embodiment] Figure 6 is a bottom view of the coil component according to the third embodiment. As shown in Figure 6, the coil component 1B according to the third embodiment differs from the coil component 1 according to the first embodiment in terms of the shape of the dummy electrode 50. In the following description, explanations of the similarities between coil component 1B and coil component 1 will be omitted as appropriate. Viewed from the second direction D2, the dummy electrode 50 of coil component 1B is roughly Z-shaped and has three straight sections 50d, 50e, and 50f. The straight section 50d is positioned closer to the end face 2b than the first imaginary line A and extends along the third direction D3. The straight section 50e is positioned closer to the end face 2a than the second imaginary line B and extends along the third direction D3. The straight section 50f is positioned in the center of the main surface 2c in the third direction D3 and extends along the first direction D1 to connect the pair of straight sections 50d and 50e. Viewed from the second direction D2, the line width of the straight section 50f is narrower than that of each of the straight sections 50d and 50e. In other words, the length of the straight section 50f in the third direction D3 is shorter than the length of each straight section 50d, 50e in the first direction D1.
[0054] Viewed from the second direction D2, the dummy electrodes 12 and 22 have the same rectangular shape. Viewed from the second direction D2, the direction of the longer sides of the dummy electrodes 12 and 22 is the first direction D1. Viewed from the second direction D2, the dummy electrodes 12 and 22 are arranged so as to be point-symmetric with respect to the centroid of the main surface 2c. Dummy electrode 12 is separated from the connecting electrode 11 in the third direction D3. Dummy electrode 22 is separated from the connecting electrode 21 in the third direction D3. Viewed from the second direction D2, the dummy electrodes 31 and 41 have the same L-shape. Viewed from the second direction D2, the dummy electrodes 31 and 41 are arranged so as to be point-symmetric with respect to the centroid of the main surface 2c.
[0055] In coil component 1B, the sum of the area of the third conductor portion 30 and the area of the fourth conductor portion 40 is greater than the sum of the area of the first conductor portion 10 and the area of the second conductor portion 20, so the same effect as in coil component 1 is obtained. In coil component 1B, the straight portion 50f of the dummy electrode 50 extends in the first direction D1. Therefore, when viewed from the second direction D2, the area in which the dummy electrode 50 overlaps with the coil 5 is smaller than in the case of coil component 1. Consequently, in coil component 1B, the influence of the stray capacitance generated between the dummy electrode 50 and the coil 5 on coil component 1B is smaller than in the case of coil component 1.
[0056] [Fourth Embodiment] Figure 7 is a bottom view of the coil component according to the fourth embodiment. As shown in Figure 7, the coil component 1C according to the fourth embodiment differs from the coil component 1 according to the first embodiment in terms of the shape of the dummy electrode 50. In the following description, explanations of the similarities between coil component 1C and coil component 1 will be omitted as appropriate. Viewed from the second direction D2, the dummy electrode 50 has a roughly S-shape. In addition to the three straight sections 50a, 50b, and 50c, the dummy electrode 50 further has two straight sections 50g and 50h. Straight section 50g extends from the end of straight section 50a near the end face 2b toward the connecting electrode 21 in the third direction D3. Straight section 50h extends from the end of straight section 50b near the end face 2a toward the connecting electrode 11 in the third direction D3. Viewed from the second direction D2, the line widths of the straight sections 50a, 50b, 50c, 50g, and 50h are equivalent to each other. In other words, the lengths of the straight sections 50a and 50b in the third direction D3, and the lengths of the straight sections 50c, 50g, and 50h in the first direction D1 are equal to each other.
[0057] The first conductor section 10 has a dummy electrode 13 in addition to the connecting electrode 11 and the dummy electrode 12. The dummy electrode 12 constitutes a part of the straight section 50c. The dummy electrode 13 is connected to the dummy electrode 31 and constitutes a part of the straight section 50h. The second conductor section 20 has a dummy electrode 23 in addition to the connecting electrode 21 and the dummy electrode 22. The dummy electrode 22 constitutes a part of the straight section 50c. The dummy electrode 23 is connected to the dummy electrode 41 and constitutes a part of the straight section 50g.
[0058] In coil component 1C, the sum of the area of the third conductor portion 30 and the area of the fourth conductor portion 40 is greater than the sum of the area of the first conductor portion 10 and the area of the second conductor portion 20, so the same effect as coil component 1 can be obtained. Also, the sum of lengths L3 and L4 is greater than the sum of lengths L1 and L2, so the same effect as coil component 1 can be obtained. In coil component 1C, the approximately S-shaped dummy electrode 50 further has straight portions 50g and 50h, so the contact area between the mounting conductor of coil component 1C and other electronic equipment 60 can be increased compared to the approximately Z-shaped dummy electrode 50 in coil component 1. Therefore, the mounting strength of coil component 1C to other electronic equipment 60 can be further improved.
[0059] [Fifth Embodiment] Figure 8 is a bottom view of the coil component according to the fifth embodiment. As shown in Figure 8, the coil component 1D according to the fifth embodiment differs from the coil component 1 according to the first embodiment in terms of the configuration of the mounting conductors (first conductor portion 10, second conductor portion 20, third conductor portion 30, and fourth conductor portion 40). In the following description, explanations of the similarities between coil component 1D and coil component 1 will be omitted as appropriate.
[0060] The connecting electrodes 11 and 21 extend along the third direction D3 to the first virtual line A. The third conductor section 30 further includes a connecting electrode 32 in addition to the dummy electrode 31. The dummy electrode 31 and the connecting electrode 32 are spaced apart from each other in the third direction D3. The connecting electrode 32 is connected to the connecting electrode 11. The fourth conductor section 40 further includes a connecting electrode 42 in addition to the dummy electrode 41. The dummy electrode 41 and the connecting electrode 42 are spaced apart from each other in the third direction D3. The connecting electrode 42 is connected to the connecting electrode 21.
[0061] Viewed from the second direction D2, the dummy electrodes 31 and 41 are identical in shape and exhibit a rectangular form with the first direction D1 as the longer side. Viewed from the second direction D2, the dummy electrodes 31 and 41 are arranged so as to be point-symmetric with respect to the centroid of the main surface 2c.
[0062] Viewed from the second direction D2, the connecting electrodes 32 and 42 are identical in shape and form a rectangle with the first direction D1 as the longer side. Viewed from the second direction D2, the connecting electrodes 32 and 42 are arranged so as to be point-symmetric with respect to the centroid of the main surface 2c.
[0063] The connecting electrodes 11 and 32 are integrally formed with each other, constituting a single connecting electrode 70. The connecting electrodes 21 and 42 are integrally formed with each other, constituting a single connecting electrode 80. Viewed from the second direction D2, the connecting electrodes 70 and 80 have the same shape and exhibit a rectangular shape with the third direction D3 as the longer side. Viewed from the second direction D2, the connecting electrodes 70 and 80 are arranged so as to be point-symmetric with respect to the centroid of the main surface 2c. The connecting electrodes 70 and 80 are separated from each other in the first direction D1, and are arranged so as to partially overlap when viewed from the first direction D1.
[0064] In coil component 1D, the dummy electrodes 31 and 41 are not connected to each other and are formed as separate components separated from each other. The connecting electrode 70 is formed spanning the first region R1 and the third region R3 so as to pass through the first virtual line A. The connecting electrode 80 is formed spanning the second region R2 and the fourth region R4 so as to pass through the first virtual line A.
[0065] In coil component 1D, the sum of the area of the third conductor portion 30 and the area of the fourth conductor portion 40 is greater than the sum of the area of the first conductor portion 10 and the area of the second conductor portion 20, so the same effect as coil component 1 is obtained. Also, the sum of lengths L3 and L4 is longer than the sum of lengths L1 and L2, so the same effect as coil component 1 is obtained.
[0066] [Sixth Embodiment] Figure 9 is a bottom view of the coil component according to the sixth embodiment. As shown in Figure 9, the coil component 1E according to the sixth embodiment differs from the coil component 1 according to the first embodiment in terms of the configuration of the mounting conductors (first conductor portion 10, second conductor portion 20, third conductor portion 30, and fourth conductor portion 40). In the following description, explanations of the similarities between coil component 1E and coil component 1 will be omitted as appropriate.
[0067] The connecting electrodes 11 and 21 extend along the third direction D3 to the first virtual line A. The third conductor section 30 has a connecting electrode 32 instead of a dummy electrode 31. The connecting electrode 32 is connected to the connecting electrode 11. The fourth conductor section 40 has a connecting electrode 42 instead of a dummy electrode 41. The connecting electrode 42 is connected to the connecting electrode 21.
[0068] Viewed from the second direction D2, the connecting electrodes 32 and 42 exhibit the same L-shape. Viewed from the second direction D2, the connecting electrodes 32 and 42 are arranged so as to be point-symmetric with respect to the centroid of the main surface 2c. Each of the connecting electrodes 32 and 42 is in contact with the first virtual line A and the second virtual line B.
[0069] The connecting electrodes 11 and 32 are integrally formed with each other, constituting a single connecting electrode 70. The connecting electrodes 21 and 42 are integrally formed with each other, constituting a single connecting electrode 80. Viewed from the second direction D2, the connecting electrodes 70 and 80 have the same L-shape. Viewed from the second direction D2, the connecting electrode 70 has a straight portion 70b extending in the first direction D1 and a straight portion 70a extending along the third direction D3. Viewed from the second direction D2, the connecting electrode 80 has a straight portion 80b extending in the first direction D1 and a straight portion 80a extending along the third direction D3. Viewed from the second direction D2, the connecting electrodes 70 and 80 are arranged so as to be point-symmetric with respect to the centroid of the main surface 2c.
[0070] In coil component 1E, no dummy electrodes are provided on the main surface 2c. The connecting electrode 70 is formed spanning the first region R1 and the third region R3 so as to pass through the first virtual line A. The connecting electrode 80 is formed spanning the second region R2 and the fourth region R4 so as to pass through the first virtual line A.
[0071] In coil component 1E, the sum of the area of the third conductor section 30 and the area of the fourth conductor section 40 is greater than the sum of the area of the first conductor section 10 and the area of the second conductor section 20, so the same effect as coil component 1 is obtained. Also, the sum of the lengths L3 and L4 is greater than the sum of the lengths L1 and L2, so the same effect as coil component 1 is obtained.
[0072] [Seventh Embodiment] Figure 10 is a bottom view of the coil component according to the seventh embodiment. As shown in Figure 10, the coil component 1F according to the seventh embodiment differs from the coil component 1 according to the first embodiment in terms of the configuration of the mounting conductors (first conductor portion 10, second conductor portion 20, third conductor portion 30, and fourth conductor portion 40). In the following description, explanations of the similarities between coil component 1F and coil component 1 will be omitted as appropriate.
[0073] The connecting electrodes 11 and 21 extend along the first direction D1 to the second virtual line B. The third conductor section 30 has a connecting electrode 32 instead of a dummy electrode 31. The connecting electrode 32 is connected to the connecting electrode 21. The fourth conductor section 40 has a connecting electrode 42 instead of a dummy electrode 41. The connecting electrode 42 is connected to the connecting electrode 11.
[0074] Viewed from the second direction D2, the connecting electrodes 32 and 42 exhibit the same L-shape. Viewed from the second direction D2, the connecting electrodes 32 and 42 are arranged so as to be point-symmetric with respect to the centroid of the main surface 2c. Each of the connecting electrodes 32 and 42 is separated from the first virtual line A and in contact with the second virtual line B.
[0075] The connecting electrodes 11 and 42 are integrally formed with each other, constituting a single connecting electrode 70. The connecting electrodes 21 and 32 are integrally formed with each other, constituting a single connecting electrode 80. Viewed from the second direction D2, the connecting electrodes 70 and 80 have the same L-shape. Viewed from the second direction D2, the connecting electrode 70 has a straight portion 70c extending in the first direction D1 and a straight portion 70d extending along the third direction D3. Viewed from the second direction D2, the connecting electrode 80 has a straight portion 80c extending in the first direction D1 and a straight portion 80d extending along the third direction D3. Viewed from the second direction D2, the connecting electrodes 70 and 80 are arranged point-symmetrically with respect to the centroid of the main surface 2c.
[0076] In coil component 1F, no dummy electrodes are provided on the main surface 2c. The connecting electrode 70 is formed spanning the first region R1 and the fourth region R4 so as to pass through the second virtual line B. The connecting electrode 80 is formed spanning the second region R2 and the third region R3 so as to pass through the second virtual line B. In coil component 1F as well, the sum of the area of the third conductor portion 30 and the area of the fourth conductor portion 40 is greater than the sum of the area of the first conductor portion 10 and the area of the second conductor portion 20, so the same effect as coil component 1 can be obtained.
[0077] In coil 5, a potential difference is generated between the first end 7 and the second end 8. Since the connecting electrode 70 is connected to the first end 7, it is at the same potential as the first end 7. The potential difference between the connecting electrode 70 and coil 5 increases as it moves away from the first end 7 and closer to the second end 8 in the coil axial direction (third direction D3). In coil component 1F, the connecting electrode 70 is not positioned in the second region R2 and the third region R3 where the potential difference with coil 5 is high. As a result, the potential difference between the connecting electrode 70 and coil 5 is reduced, and the stray capacitance generated between the connecting electrode 70 and coil 5 is reduced.
[0078] Since the connecting electrode 80 is connected to the second end 8, it is at the same potential as the second end 8. The potential difference between the connecting electrode 80 and the coil 5 increases as it moves away from the second end 8 and closer to the first end 7 in the coil axial direction (third direction D3). In coil component 1F, the connecting electrode 80 is not positioned in the first region R1 and the fourth region R4 where the potential difference between it and the coil 5 is high. As a result, the potential difference between the connecting electrode 80 and the coil 5 is reduced, and the stray capacitance between the connecting electrode 80 and the coil 5 is reduced.
[0079] Although embodiments have been described above, the present invention is not necessarily limited to the embodiments described above, and various modifications are possible without departing from the spirit of the invention. For example, the number of connecting electrodes and dummy electrodes on the main surface 2c is not limited to the number shown. The connecting electrodes and dummy electrodes do not have to be arranged point-symmetrically with respect to the centroid of the main surface 2c.
[0080] Each embodiment and its variations may be combined as appropriate.
[0081] As can be seen from the embodiments and modifications described above, this specification includes disclosures of the following aspects. (Note 1) A base body having a pair of end faces facing each other in a first direction, a first principal surface and a second principal surface facing each other in a second direction, and a pair of side surfaces facing each other in a third direction, A coil placed inside the aforementioned body, The first main surface comprises a first conductor section, a second conductor section, a third conductor section, and a fourth conductor section, The first main surface has a first region, a second region, a third region, and a fourth region, which are divided into four equal parts by a first imaginary line along the first direction and a second imaginary line along the third direction. The first region and the second region are arranged diagonally, The third and fourth regions are provided diagonally, The first conductor portion is arranged in the first region, The second conductor portion is arranged in the second region, The third conductor portion is arranged in the third region, The fourth conductor portion is arranged in the fourth region, The first conductor portion includes a first connecting electrode connected to the first end of the coil, The second conductor portion includes a second connecting electrode connected to the second end of the coil, The first connecting electrode and the second connecting electrode are spaced apart from each other. A coil component in which, when viewed from the second direction, the sum of the area of the third conductor and the area of the fourth conductor is greater than the sum of the area of the first conductor and the area of the second conductor. (Note 2) The coil component as described in Appendix 1, wherein, when viewed from the second direction, the area of the third conductor portion is larger than the area of the first conductor portion, and the area of the fourth conductor portion is larger than the area of the second conductor portion. (Note 3) The first conductor portion further includes a first dummy electrode separated from the first connecting electrode, The second conductor portion further includes a second dummy electrode separated from the second connecting electrode, The coil component described in Appendix 1 or 2, wherein the first dummy electrode, the second dummy electrode, the third conductor portion, and the fourth conductor portion are connected to each other. (Note 4) The third conductor portion includes a third connecting electrode connected to the first connecting electrode, The fourth conductor portion is a coil component according to any one of the appendices 1 to 3, including a fourth connecting electrode connected to the second connecting electrode. (Note 5) The third conductor portion includes a fifth connecting electrode connected to the second connecting electrode. The fourth conductor portion is a coil component according to any one of the appendices 1 to 4, including a sixth connecting electrode connected to the first connecting electrode. (Note 6) The entirety of the third conductor portion is separated from the first connecting electrode. The entirety of the fourth conductor portion is separated from the second connecting electrode, and is a coil component as described in any of the appendices 1 to 3 or 5. (Note 7) A base body having a pair of end faces facing each other in a first direction, a first principal surface and a second principal surface facing each other in a second direction, and a pair of side surfaces facing each other in a third direction, A coil placed inside the aforementioned body, The first main surface comprises a first conductor section, a second conductor section, a third conductor section, and a fourth conductor section, The first main surface has a first region, a second region, a third region, and a fourth region, which are divided into four equal parts by a first imaginary line along the first direction and a second imaginary line along the third direction. The first region and the second region are arranged diagonally, The third and fourth regions are provided diagonally, The first conductor portion is arranged in the first region, The second conductor portion is arranged in the second region, The third conductor portion is arranged in the third region, The fourth conductor portion is arranged in the fourth region, The first conductor portion includes a first connecting electrode connected to the first end of the coil, The second conductor portion includes a second connecting electrode connected to the second end of the coil, The first connecting electrode and the second connecting electrode are spaced apart from each other. A coil component in which the sum of the length of the third conductor portion along the first direction and the length of the fourth conductor portion along the first direction is longer than the sum of the length of the first conductor portion along the first direction and the length of the second conductor portion along the first direction. (Note 8) The coil component as described in Appendix 7, wherein the length of the third conductor portion along the first direction is longer than the length of the first conductor portion along the first direction, and the length of the fourth conductor portion along the first direction is longer than the length of the second conductor portion along the first direction. (Note 9) The first conductor portion further includes a first dummy electrode separated from the first connecting electrode, The second conductor portion further includes a second dummy electrode separated from the second connecting electrode, The coil component described in Appendix 7 or 8, wherein the first dummy electrode, the second dummy electrode, the third conductor portion, and the fourth conductor portion are connected to each other. (Note 10) The third conductor portion includes a third connecting electrode connected to the first connecting electrode, The fourth conductor portion is a coil component according to any one of the appendices 7 to 9, including a fourth connecting electrode connected to the second connecting electrode. (Note 11) The third conductor portion includes a fifth connecting electrode connected to the second connecting electrode. The coil component described in any of appendices 7 to 10, wherein the fourth conductor portion includes a sixth connecting electrode connected to the first connecting electrode. (Note 12) The entirety of the third conductor portion is separated from the first connecting electrode. The coil component described in any of appendices 7 to 9 or 11, wherein the entire fourth conductor portion is separated from the second connecting electrode. [Explanation of symbols]
[0082] 1, 1A, 1B, 1C, 1D, 1E, 1F... coil components, 2... base body, 5... coil, 7... first end, 8... second end, D1... first direction, D2... second direction, D3... third direction, 2a, 2b... end faces, 2c, 2d... main faces, 2e, 2f... side faces, 10... first conductor section, 20... second conductor section, 30... third conductor section, 40... fourth conductor section, A... first virtual line, B... second virtual line, R1... first region, R2... second region, R3... third region, R4... fourth region, 11, 21, 32, 42... connecting electrodes, 12, 13, 22, 23, 31, 41... dummy electrodes.
Claims
1. A base body having a pair of end faces facing each other in a first direction, a first principal surface and a second principal surface facing each other in a second direction, and a pair of side surfaces facing each other in a third direction, A coil placed inside the aforementioned body, The first main surface comprises a first conductor section, a second conductor section, a third conductor section, and a fourth conductor section, The first main surface has a first region, a second region, a third region, and a fourth region, which are divided into four equal parts by a first imaginary line along the first direction and a second imaginary line along the third direction. The first region and the second region are arranged diagonally, The third and fourth regions are provided diagonally, The first conductor portion is arranged in the first region, The second conductor portion is arranged in the second region, The third conductor portion is arranged in the third region, The fourth conductor portion is arranged in the fourth region, The first conductor portion includes a first connecting electrode connected to the first end of the coil, The second conductor portion includes a second connecting electrode connected to the second end of the coil, The first connecting electrode and the second connecting electrode are spaced apart from each other. A coil component in which, when viewed from the second direction, the sum of the area of the third conductor and the area of the fourth conductor is greater than the sum of the area of the first conductor and the area of the second conductor.
2. The coil component according to claim 1, wherein, when viewed from the second direction, the area of the third conductor portion is larger than the area of the first conductor portion, and the area of the fourth conductor portion is larger than the area of the second conductor portion.
3. The first conductor portion further includes a first dummy electrode separated from the first connecting electrode, The second conductor portion further includes a second dummy electrode separated from the second connecting electrode, The coil component according to claim 1 or 2, wherein the first dummy electrode, the second dummy electrode, the third conductor portion, and the fourth conductor portion are connected to each other.
4. The third conductor portion includes a third connecting electrode connected to the first connecting electrode, The coil component according to claim 1 or 2, wherein the fourth conductor portion includes a fourth connecting electrode connected to the second connecting electrode.
5. The third conductor portion includes a fifth connecting electrode connected to the second connecting electrode. The coil component according to claim 1 or 2, wherein the fourth conductor portion includes a sixth connecting electrode connected to the first connecting electrode.
6. The entirety of the third conductor portion is separated from the first connecting electrode. The coil component according to claim 1 or 2, wherein the entire fourth conductor portion is separated from the second connecting electrode.
7. A base body having a pair of end faces facing each other in a first direction, a first principal surface and a second principal surface facing each other in a second direction, and a pair of side surfaces facing each other in a third direction, A coil placed inside the aforementioned body, The first main surface comprises a first conductor section, a second conductor section, a third conductor section, and a fourth conductor section, The first main surface has a first region, a second region, a third region, and a fourth region, which are divided into four equal parts by a first imaginary line along the first direction and a second imaginary line along the third direction. The first region and the second region are arranged diagonally, The third and fourth regions are provided diagonally, The first conductor portion is arranged in the first region, The second conductor portion is arranged in the second region, The third conductor portion is arranged in the third region, The fourth conductor portion is arranged in the fourth region, The first conductor portion includes a first connecting electrode connected to the first end of the coil, The second conductor portion includes a second connecting electrode connected to the second end of the coil, The first connecting electrode and the second connecting electrode are spaced apart from each other. A coil component in which the sum of the length of the third conductor portion along the first direction and the length of the fourth conductor portion along the first direction is longer than the sum of the length of the first conductor portion along the first direction and the length of the second conductor portion along the first direction.
8. The coil component according to claim 7, wherein the length of the third conductor portion along the first direction is longer than the length of the first conductor portion along the first direction, and the length of the fourth conductor portion along the first direction is longer than the length of the second conductor portion along the first direction.
9. The first conductor portion further includes a first dummy electrode separated from the first connecting electrode, The second conductor portion further includes a second dummy electrode separated from the second connecting electrode, The coil component according to claim 7 or 8, wherein the first dummy electrode, the second dummy electrode, the third conductor portion, and the fourth conductor portion are connected to each other.
10. The third conductor portion includes a third connecting electrode connected to the first connecting electrode, The coil component according to claim 7 or 8, wherein the fourth conductor portion includes a fourth connecting electrode connected to the second connecting electrode.
11. The third conductor portion includes a fifth connecting electrode connected to the second connecting electrode. The coil component according to claim 7 or 8, wherein the fourth conductor portion includes a sixth connecting electrode connected to the first connecting electrode.
12. The entirety of the third conductor portion is separated from the first connecting electrode. The coil component according to claim 7 or 8, wherein the entire fourth conductor portion is separated from the second connecting electrode.