Coil component
By employing a multi-layer conductor structure and insulating resin design in the magnetic body, the problem of magnetic filler falling off when the outer diameter of the coil pattern increases is solved, thus achieving the stability of the coil component and the maintenance of inductance parameters.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TDK CORP
- Filing Date
- 2025-12-25
- Publication Date
- 2026-07-10
AI Technical Summary
During the process of increasing the outer diameter of the coil pattern, the magnetic filler is prone to falling off.
A multi-layer conductor structure is adopted. By setting insulating resin between the magnetic body and the coil, multiple exposed parts are formed to cover weak areas and prevent the magnetic filler from falling off.
Even when the outer diameter of the coil pattern is increased, the shedding of magnetic filler can be effectively suppressed, maintaining the stability of the magnetic material.
Smart Images
Figure CN122370140A_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to a coil component, and more particularly, to a coil component having a structure in which a coil pattern is embedded in a magnetic body. Background Technology
[0002] Patent document 1 discloses a coil component having a structure in which a coil pattern is embedded in a magnetic body.
[0003] Existing technical documents
[0004] Patent documents
[0005] Patent Document 1: Japanese Patent Application Publication No. 2021-019088 Summary of the Invention
[0006] The technical problem that the invention aims to solve
[0007] In such coil components, if the outer diameter of the coil pattern is increased while maintaining the size of the magnetic element, a thin section of the magnetic element may form, in which the magnetic filler contained in the magnetic element is prone to detachment.
[0008] This disclosure describes a technique for suppressing the shedding of magnetic filler even when the outer diameter of the coil pattern is increased in a coil component having a structure in which a coil pattern is embedded in a magnetic body.
[0009] Means for solving technical problems
[0010] One aspect of the coil component of this disclosure includes: a magnetic body having a mounting surface, an upper surface located opposite to the mounting surface, and first and second side surfaces orthogonal to the mounting surface and the upper surface and located opposite to each other; a coil portion embedded in the magnetic body, comprising a plurality of conductor layers stacked in a stacking direction parallel to the mounting surface, the upper surface, and the first and second side surfaces; and an insulating resin located between the magnetic body and the coil portion. The plurality of conductor layers includes a first conductor layer, a second conductor layer, and one or more third conductor layers located between the first and second conductor layers. The first conductor layer includes: a first coil pattern, the outer peripheral end of which, exposed from the mounting surface, constitutes one end of the coil portion; and a first terminal pattern, exposed from the mounting surface. The second conductor layer includes: a second coil pattern, the outer peripheral end of which, exposed from the mounting surface, constitutes the other end of the coil portion; and a second terminal pattern, exposed from the mounting surface. The third conductor layer includes: a third coil pattern, one end of which is connected to one end of the coil portion via the first coil pattern, and the other end of which is connected to the other end of the coil portion via the second coil pattern; and third and fourth terminal patterns, exposed from the mounting surface. The insulating resin on the mounting surface includes: a first exposed portion that is exposed from the area between the outer peripheral end of the first coil pattern, the second terminal pattern, and the third terminal pattern and the outer peripheral end of the second coil pattern, the first terminal pattern, and the fourth terminal pattern; a second exposed portion that is exposed from the upper surface; a third exposed portion that is exposed from the first side surface; and a fourth exposed portion that is exposed from the second side surface.
[0011] The effects of the invention
[0012] According to this disclosure, in a coil component having a structure in which a coil pattern is embedded in a magnetic body, the shedding of the magnetic filler can be suppressed even when the outer diameter of the coil pattern is increased. Attached Figure Description
[0013] Figure 1 (a) and (b) are general perspective views showing the appearance of a coil component 100 according to one embodiment of the technology of this disclosure, showing the state viewed from different directions.
[0014] Figure 2 This is a general perspective view showing the state in which terminal electrodes 121 and 122 are removed from coil component 100.
[0015] Figure 3 This is a general cross-sectional view used to illustrate the structure of the conductor layer L1 in the coil component 100.
[0016] Figure 4 This is a general cross-sectional view used to illustrate the structure of the conductor layer L2 in the coil component 100.
[0017] Figure 5This is a general cross-sectional view used to illustrate the structure of the conductor layer L3 in the coil component 100.
[0018] Figure 6 This is a general cross-sectional view used to illustrate the structure of the conductor layer L4 in the coil component 100.
[0019] Figure 7 This is a general cross-sectional view used to illustrate the structure of the conductor layer L5 in the coil component 100.
[0020] Figure 8 This is a general cross-sectional view used to illustrate the structure of the conductor layer L6 in the coil component 100.
[0021] Figure 9 This is a general perspective view of the coil component 100A based on the modified example.
[0022] Figure 10 This is a general cross-sectional view used to illustrate the structure of the conductor layer L1 in the coil component 100A.
[0023] Figure 11 This is a general cross-sectional view used to illustrate the structure of the conductor layer L2 in the coil component 100A.
[0024] Figure 12 This is a general cross-sectional view used to illustrate the structure of conductor layer L3 in coil component 100A.
[0025] Figure 13 This is a general cross-sectional view used to illustrate the structure of the conductor layer L4 in the coil component 100A.
[0026] Figure 14 This is a general cross-sectional view used to illustrate the structure of the conductor layer L5 in the coil component 100A.
[0027] Figure 15 This is a general cross-sectional view used to illustrate the structure of the conductor layer L6 in the coil component 100A.
[0028] Explanation of reference numerals in the attached figures
[0029] 10, 20, 30, 40, 50, 60: Coil patterns
[0030] 10A, 60A: Peripheral end
[0031] 12, 21, 22, 31, 32, 41, 42, 51, 52, 61: Terminal patterns
[0032] 100, 100A: Coil components
[0033] 110: Magnetic Body
[0034] 110A~110E: Area
[0035] 111: Mounting surface
[0036] 112: Upper surface
[0037] 113~116: Side view
[0038] 121, 122: Terminal electrodes
[0039] 121a, 122a: Region
[0040] 130: Insulating resin
[0041] 131-134: Exposed areas
[0042] L1~L6: Conductor layers
[0043] S1~S4: Interval
[0044] T1~T4: Thickness
[0045] W1~W4, W2a: Width Detailed Implementation
[0046] Hereinafter, embodiments of the technology disclosed herein will be described in detail with reference to the accompanying drawings.
[0047] Figure 1 (a) and (b) are general perspective views showing the appearance of a coil component 100 according to one embodiment of the technology of this disclosure, showing the state viewed from different directions.
[0048] like Figure 1 As shown in (a) and (b), the coil component 100 according to this embodiment includes a magnetic body 110 and a pair of terminal electrodes 121 and 122 disposed on the mounting surface 111 of the magnetic body 110. As will be described later, a coil portion composed of conductor layers L1 to L6 is embedded in the magnetic body 110, one end of the coil portion is connected to the terminal electrode 121, and the other end of the coil portion is connected to the terminal electrode 122.
[0049] The magnetic core 110 can also be made of a composite magnetic material, which is formed by fixing a magnetic filler made of a high-permeability material such as ferrite or permalloy with a resin adhesive. To further improve the inductance of the coil component 100, it is advantageous to use a magnetic filler with a large diameter. The magnetic core 110 has a mounting surface 111 and an upper surface 112 forming the XY plane and located opposite each other, side surfaces 113 and 114 forming the YZ plane and located opposite each other, and side surfaces 115 and 116 forming the XY plane and located opposite each other. Therefore, the mounting surface 111 and the upper surface 112 are orthogonal to the side surfaces 113 and 114 and 115 and 116.
[0050] Terminal electrode 121 is disposed at the end of the mounting surface 111 in the -X direction. Terminal electrode 122 is disposed at the end of the mounting surface 111 in the +X direction. The width of terminal electrodes 121 and 122 in the Z direction may also be the same as the width of the mounting surface 111 in the Z direction. In addition, a portion of terminal electrode 121 may be wound around the side surfaces 115 and 116 of the magnetic body 110, or around the side surface 113 of the magnetic body 110. A portion of terminal electrode 122 may be wound around the side surfaces 115 and 116 of the magnetic body 110, or around the side surface 114 of the magnetic body 110.
[0051] Figure 2 This is a general perspective view showing the state in which terminal electrodes 121 and 122 are removed from coil component 100.
[0052] like Figure 2 As shown, the outer peripheral end 10A of the coil pattern located in conductor layer L1 and the terminal patterns 21, 31, 41, 51, and 61 located in conductor layers L2 to L6 respectively are exposed from the mounting surface 111 of the magnetic body 110. The outer peripheral end 10A of the coil pattern and the terminal patterns 21, 31, 41, 51, and 61 are arranged along the Z direction on the mounting surface 111. The terminal electrode 121 is provided in contact with the outer peripheral end 10A of the coil pattern and the terminal patterns 21, 31, 41, 51, and 61. Furthermore, the terminal patterns 12, 22, 32, 42, and 52 located in conductor layers L1 to L5 and the outer peripheral end 60A of the coil pattern located in conductor layer L6 are exposed from the mounting surface 111 of the magnetic body 110. The terminal patterns 12, 22, 32, 42, and 52 and the outer peripheral end 60A of the coil pattern are arranged along the Z direction on the mounting surface 111. Terminal electrode 122 is configured to contact the outer peripheral end 60A of terminal patterns 12, 22, 32, 42, 52 and coil pattern.
[0053] The exposed portion 131 of the insulating resin is exposed from the area located between the outer peripheral end 10A of the coil pattern and the area between the terminal patterns 21, 31, 41, 51, 61 and the terminal patterns 12, 22, 32, 42, 52 and the outer peripheral end 60A of the coil pattern. Similarly, the exposed portion 132 of the insulating resin is exposed from the upper surface 112, the exposed portion 133 of the insulating resin is exposed from the side 113, and the exposed portion 134 of the insulating resin is exposed from the side 114.
[0054] exist Figure 1In the examples shown in (a) and (b), the exposed portion 131 is located approximately at the center of the mounting surface 111 in the X direction. Similarly, the exposed portion 132 is located approximately at the center of the upper surface 112 in the X direction, the exposed portion 133 is located approximately at the center of the side surface 113 in the Y direction, and the exposed portion 134 is located approximately at the center of the side surface 114 in the Y direction.
[0055] like Figure 1 As shown in (a), the terminal electrodes 121 and 122 may also have regions 121a and 122a that cover the exposed portion 131. When the terminal electrodes 121 and 122 have regions 121a and 122a that cover the exposed portion 131, the area of the terminal electrodes 121 and 122 is increased, thus improving mounting reliability when mounting the coil component 100 to the circuit board using solder or the like. The width of regions 121a and 122a in the Z direction may be the same as or larger than the width of the exposed portion 131 in the Z direction, thereby allowing a portion of regions 121a and 122a to cover the mounting surface 111 of the magnetic element 110. In the latter case, since the boundary between the mounting surface 111 of the magnetic element 110 and the exposed portion 131 of the insulating resin is covered by regions 121a and 122a of the terminal electrodes 121 and 122, detachment of the magnetic filler in that portion can be suppressed. Such regions 121a and 122a can also be formed by flowing paste-like terminal electrodes 121 and 122 into the exposed portion 131. The flow width of the terminal electrodes 121 and 122 into the exposed portion 131 can be adjusted by the surface roughness of the exposed portion 131; the smaller the surface roughness of the exposed portion 131, the greater the flow. The surface roughness of the exposed portion 131 can be smaller than the surface roughness of the magnetic element 110.
[0056] The coil component 100 of this embodiment has a structure in which six conductor layers L1 to L6 constituting the coil portion are embedded in a magnetic element 110. These conductor layers L1 to L6 are stacked in the Z direction, which is parallel to the mounting surface 111.
[0057] Figures 3-8 These are approximate cross-sectional views used to illustrate the structure of conductor layers L1 to L6.
[0058] Conductor layer L1 is the conductor layer located at the end in the -Z direction, and it is formed first during manufacturing. Figure 3In the example shown, the conductor layer L1 includes a coil pattern 10 wound with approximately two turns and a terminal pattern 12 disposed in-plane and separate from the coil pattern 10. The outer peripheral end 10A of the coil pattern 10 and the terminal pattern 12 are exposed from the mounting surface 111 of the magnetic body 110. An insulating resin 130 is provided between the conductor layer L1 and the magnetic body 110, thereby preventing contact between the conductor layer L1 and the magnetic body 110. The insulating resin 130 may also be made of a material in which an inorganic filler made of an insulating material such as silicon dioxide is fixed by a resin adhesive.
[0059] Conductor layer L2 is the second conductor layer counting from the end in the -Z direction, and is formed after conductor layer L1 via insulating resin 130 during manufacturing. Figure 4 In the example shown, conductor layer L2 includes a coil pattern 20 wound with approximately two turns and terminal patterns 21 and 22 disposed separately from the coil pattern 20 in plane. The inner peripheral end of the coil pattern 20 is connected to the inner peripheral end of the coil pattern 10 located in conductor layer L1 via a through-hole provided in insulating resin 130. Terminal patterns 21 and 22 are connected to the outer peripheral end 10A of the coil pattern 10 and the terminal pattern 12, respectively, via through-holes provided in insulating resin 130. Terminal patterns 21 and 22 are exposed from the mounting surface 111 of the magnetic element 110. Insulating resin 130 is provided between conductor layer L2 and magnetic element 110 and between conductor layer L1 and conductor layer L2, thereby separating conductor layer L2 from conductor layer L1 and preventing contact between conductor layer L2 and magnetic element 110.
[0060] Conductor layer L3 is the third conductor layer counting from the end in the -Z direction, and is formed after conductor layer L2 via insulating resin 130 during manufacturing. Figure 5 In the example shown, conductor layer L3 includes a coil pattern 30 wound with approximately two turns and terminal patterns 31 and 32 disposed in-plane and separate from the coil pattern 30. The outer peripheral end of the coil pattern 30 is connected to the outer peripheral end of the coil pattern 20 located in conductor layer L2 via a through-hole provided in insulating resin 130. Terminal patterns 31 and 32 are respectively connected to terminal patterns 21 and 22 of conductor layer L2 via through-holes provided in insulating resin 130. Terminal patterns 31 and 32 are exposed from the mounting surface 111 of magnetic element 110. Insulating resin 130 is provided between conductor layer L3 and magnetic element 110 and between conductor layer L2 and conductor layer L3, thereby separating conductor layer L3 from conductor layer L2 and preventing contact between conductor layer L3 and magnetic element 110.
[0061] Conductor layer L4 is the fourth conductor layer counting from the end in the -Z direction, and is formed after conductor layer L3 via insulating resin 130 during manufacturing. Figure 6In the example shown, conductor layer L4 includes a coil pattern 40 wound with approximately two turns and terminal patterns 41 and 42 disposed separately from the coil pattern 40 in plane. The inner peripheral end of the coil pattern 40 is connected to the inner peripheral end of the coil pattern 30 located in conductor layer L3 via a through-hole provided in insulating resin 130. Terminal patterns 41 and 42 are respectively connected to terminal patterns 31 and 32 of conductor layer L3 via through-holes provided in insulating resin 130. Terminal patterns 41 and 42 are exposed from the mounting surface 111 of magnetic element 110. Insulating resin 130 is provided between conductor layer L4 and magnetic element 110 and between conductor layer L3 and conductor layer L4, thereby separating conductor layer L4 from conductor layer L3 and preventing contact between conductor layer L4 and magnetic element 110.
[0062] Conductor layer L5 is the fifth conductor layer counting from the end in the -Z direction, and is formed after conductor layer L4 via insulating resin 130 during manufacturing. Figure 7 In the example shown, conductor layer L5 includes a coil pattern 50 wound with approximately two turns and terminal patterns 51 and 52 disposed in-plane and separate from the coil pattern 50. The outer peripheral end of the coil pattern 50 is connected to the outer peripheral end of the coil pattern 40 located in conductor layer L4 via a through-hole provided in insulating resin 130. Terminal patterns 51 and 52 are respectively connected to terminal patterns 41 and 42 of conductor layer L4 via through-holes provided in insulating resin 130. Terminal patterns 51 and 52 are exposed from the mounting surface 111 of magnetic element 110. Insulating resin 130 is provided between conductor layer L5 and magnetic element 110 and between conductor layer L4 and conductor layer L5, thereby separating conductor layer L5 from conductor layer L4 and preventing contact between conductor layer L5 and magnetic element 110.
[0063] Conductor layer L6 is the conductor layer located at the end in the +Z direction, and is formed after conductor layer L5 via insulating resin 130 during manufacturing. Figure 8 In the example shown, conductor layer L6 includes a coil pattern 60 wound with approximately two turns and a terminal pattern 61 disposed in-plane, separate from the coil pattern 60. The inner peripheral end of the coil pattern 60 is connected to the inner peripheral end of the coil pattern 50 located in conductor layer L5 via a through-hole provided in insulating resin 130. The terminal pattern 61 and the outer peripheral end 60A of the coil pattern 60 are connected to the terminal patterns 51 and 52 of conductor layer L5, respectively, via through-holes provided in insulating resin 130. The terminal pattern 61 and the outer peripheral end 60A of the coil pattern 60 are exposed from the mounting surface 111 of magnetic element 110. Insulating resin 130 is provided between conductor layer L6 and magnetic element 110 and between conductor layer L5 and conductor layer L6, thereby separating conductor layer L6 from conductor layer L5 and preventing contact between conductor layer L6 and magnetic element 110.
[0064] With this structure, six coil patterns 10, 20, 30, 40, 50, and 60 are connected in series inside the magnetic body 110 to form a coil section. The outer peripheral end 10A of coil pattern 10, which is one end of the coil pattern 10, is connected to the terminal electrode 121, and the outer peripheral end 60A of coil pattern 60, which is the other end of the coil pattern 60, is connected to the terminal electrode 122. Regarding the coil patterns 20, 30, 40, and 50 located in the conductor layers L2 to L5, one end is connected to the terminal electrode 121 via coil pattern 10, and the other end is connected to the terminal electrode 122 via coil pattern 60.
[0065] like Figures 3-8 As shown, a portion of the insulating resin 130 constitutes an exposed portion 131 exposed from the mounting surface 111 of the magnetic element 110, an exposed portion 132 exposed from the upper surface 112 of the magnetic element 110, an exposed portion 133 exposed from the side surface 113 of the magnetic element 110, and an exposed portion 134 exposed from the side surface 114 of the magnetic element 110. Thus, in Figures 3-8 In the plane shown, the magnetic element 110 is divided into five regions 110A to 110E. Region 110A is located in the area surrounded by coil patterns 10, 20, 30, 40, 50, and 60. Region 110B constitutes the mounting surface 111 and side surface 113 of the magnetic element 110. Region 110C constitutes the mounting surface 111 and side surface 114 of the magnetic element 110. Region 110D constitutes the upper surface 112 and side surface 113 of the magnetic element 110. Region 110E constitutes the upper surface 112 and side surface 114 of the magnetic element 110.
[0066] exist Figures 3-8 In the plane shown, the exposed portion 131 of the insulating resin 130 is located between the outer peripheral end 10A of the coil pattern 10 and between the terminal patterns 21, 31, 41, 51, 61 and the terminal patterns 12, 22, 32, 42, 52 and the outer peripheral end 60A of the coil pattern 60. Additionally, in Figures 3-8 In the plane shown, the exposed portion 132 of the insulating resin 130 is located between regions 110D and 110E of the magnetic body 110, the exposed portion 133 of the insulating resin 130 is located between regions 110B and 110D of the magnetic body 110, and the exposed portion 134 of the insulating resin 130 is located between regions 110C and 110E of the magnetic body 110.
[0067] The exposed portion 131 of the insulating resin 130 includes the region with the shortest distance in the Y direction between the coil patterns 10, 20, 30, 40, 50, 60 and the mounting surface 111 of the magnetic body 110. The exposed portion 132 of the insulating resin 130 includes the region with the shortest distance in the Y direction between the coil patterns 10, 20, 30, 40, 50, 60 and the upper surface 112 of the magnetic body 110. The exposed portion 133 of the insulating resin 130 includes the region with the shortest distance in the X direction between the coil patterns 10, 20, 30, 40, 50, 60 and the side surface 113 of the magnetic body 110. The exposed portion 134 of the insulating resin 130 includes the region with the shortest distance in the X direction between the coil patterns 10, 20, 30, 40, 50, 60 and the side surface 114 of the magnetic body 110. These areas are thin, so if the magnetic element 110 is placed in these areas, it is particularly easy for the magnetic filler with a large diameter to fall off. However, in this embodiment, these areas are formed by the exposed portions 131 to 134 of the insulating resin 130. Therefore, even if the outer diameter of the coil patterns 10, 20, 30, 40, 50, and 60 is large, it is difficult for the magnetic filler to fall off.
[0068] Here, if the width in the X direction of the exposed portion 131 is set to W1 and the width in the X direction of the exposed portion 132 is set to W2, W1 can also be greater than W2. On the mounting surface 111 side of the magnetic element 110, not only the outer peripheral ends 10A of the coil pattern 10 and 60A of the coil pattern 60 are exposed, but also the terminal patterns 12, 21, 22, 31, 32, 41, 42, 51, 52, and 61 are exposed. Therefore, if the magnetic element 110 is arranged between the outer peripheral ends 10A of the coil pattern 10 and the terminal patterns 21, 31, 41, 51, and 61 and the outer peripheral ends 60A of the terminal patterns 12, 22, 32, 42, and 52 and the coil pattern 60, the magnetic filler may detach in this part. Taking this into consideration, the width W1 in the X direction of the exposed portion 131 exposed on the mounting surface 111 of the magnetic element 110 can be set to be sufficiently large. The exposed portion 131 also enhances the insulation withstand voltage between the outer peripheral end 10A of the coil pattern 10 and the terminal patterns 21, 31, 41, 51, 61 and the terminal patterns 12, 22, 32, 42, 52 and the outer peripheral end 60A of the coil pattern 60. In contrast, since the coil pattern, terminal pattern, etc., do not protrude from the upper surface 112 side of the magnetic element 110, the width W2 in the X direction of the exposed portion 132 can be smaller than the width W1 in the X direction of the exposed portion 131.
[0069] Furthermore, when the width of the exposed portion 133 in the Y direction is set to W3 and the width of the exposed portion 134 in the Y direction is set to W4, it is also possible that W2 > W3 and W2 > W4, or W3 = W4. In this embodiment, since the outer diameter of the coil patterns 10, 20, 30, 40, 50, and 60 has an elliptical shape with a size in the X direction larger than that in the Y direction, the curvature of the interval S3 extending along the side 113 and the interval S4 extending along the side 114 in the coil patterns 10, 20, 30, 40, 50, and 60 is smaller than the curvature of the interval S1 extending along the mounting surface 111 and the interval S2 extending along the upper surface 112. As a result, the area in the X direction where the distance in the Y direction between coil patterns 10, 20, 30, 40, 50, 60 and the upper surface 112 of the magnetic body 110 is short and the magnetic filler is prone to detachment is longer than the area in the Y direction where the distance in the X direction between coil patterns 10, 20, 30, 40, 50, 60 and the sides 113, 114 of the magnetic body 110 is short and the magnetic filler is prone to detachment is longer. Taking this into consideration, the width W2 in the X direction of the exposed portion 132 can also be set to be greater than the widths W3 and W4 in the Y direction of the exposed portions 133 and 134.
[0070] Furthermore, when the thickness in the Y direction of the exposed portion 131 is set to T1, the thickness in the Y direction of the exposed portion 132 is set to T2, the thickness in the X direction of the exposed portion 133 is set to T3, and the thickness in the X direction of the exposed portion 134 is set to T4, it is also possible for T1 < T3, T1 < T4, T2 < T3, and T2 < T4. The thicknesses T1 to T4 become thinner as the outer diameter of the coil patterns 10, 20, 30, 40, 50, and 60 increases. Generally speaking, the larger the outer diameter of the coil patterns 10, 20, 30, 40, 50, and 60, the better the parameters of the coil component 100, such as inductance and DC superposition characteristics. However, if the outer diameter of the coil patterns 10, 20, 30, 40, 50, and 60 is too large, the volume of regions 110B to 110E of the magnetic element 110 becomes smaller relative to the volume of region 110A of the magnetic element 110, resulting in, for example, a decrease in inductance. With this in mind, by making the thicknesses T3 and T4 of the exposed portions 133 and 134 with smaller widths W3 and W4 in the Y direction greater than the thicknesses T1 and T2 of the exposed portions 131 and 132 with larger widths W1 and W2 in the X direction, the outer diameter of the coil patterns 10, 20, 30, 40, 50, and 60 can be increased, and the volume of the regions 110B to 110E of the magnetic element 110 can be ensured. Therefore, parameters such as the inductance and DC superposition characteristics of the coil component 100 can be set to good values.
[0071] Furthermore, the heights of the exposed portions 131 to 134 in the Z direction can be the same.
[0072] Figure 9 This is a general perspective view of the coil component 100A of the modified example.
[0073] like Figure 9 As shown, the difference between the modified coil component 100A and the coil component 100 of the above embodiment is that the center position of the exposed portion 132 of the insulating resin 130 in the X direction is not the center position of the upper surface 112 of the magnetic element 110 in the X direction, but is offset towards the -X direction side (side 113 side). Other basic structures are the same as those of the coil component 100 of the above embodiment; therefore, the same reference numerals are used for the same elements, and repeated descriptions are omitted.
[0074] Figures 10-15 These are approximate cross-sectional views used to illustrate the structure of conductor layers L1 to L6 in the coil component 100A of the modified examples. For example... Figures 10-15 As shown, in the modified coil component 100A, the width W2a of the exposed portion 132 of the insulating resin 130 in the X direction is larger than the width W2, and it is offset towards the side 113.
[0075] As shown in the modified coil component 100A, if the exposed portion 132 of the insulating resin 130 is offset, the exposed portion 132 of the insulating resin 130 can be used as a directional mark.
[0076] The above describes the implementation of the technology involved in this disclosure. However, the technology involved in this disclosure is not limited to the above implementation. Various changes can be made without departing from its spirit, and these are of course included in the scope of the technology involved in this disclosure.
[0077] For example, the coil component 100 of the above embodiment has a structure in which six conductor layers L1 to L6 are embedded in a magnetic element 110, but the number of conductor layers embedded in the magnetic element is not limited to this.
[0078] The technologies involved in this disclosure include, but are not limited to, the following structural examples.
[0079] One aspect of the coil component of this disclosure includes: a magnetic body having a mounting surface, an upper surface located opposite to the mounting surface, and first and second side surfaces orthogonal to the mounting surface and the upper surface and located opposite to each other; a coil portion embedded in the magnetic body, comprising a plurality of conductor layers stacked in a stacking direction parallel to the mounting surface, the upper surface, and the first and second side surfaces; and an insulating resin located between the magnetic body and the coil portion. The plurality of conductor layers includes a first conductor layer, a second conductor layer, and one or more third conductor layers located between the first and second conductor layers. The first conductor layer includes: a first coil pattern, the outer peripheral end of which, exposed from the mounting surface, constitutes one end of the coil portion; and a first terminal pattern, exposed from the mounting surface. The second conductor layer includes: a second coil pattern, the outer peripheral end of which, exposed from the mounting surface, constitutes the other end of the coil portion; and a second terminal pattern, exposed from the mounting surface. The third conductor layer includes: a third coil pattern, one end of which is connected to one end of the coil portion via the first coil pattern, and the other end of which is connected to the other end of the coil portion via the second coil pattern; and third and fourth terminal patterns, exposed from the mounting surface. The insulating resin on the mounting surface includes: a first exposed portion, which is exposed from the area located between the outer peripheral end of the first coil pattern, the second terminal pattern, and the third terminal pattern and the outer peripheral end of the second coil pattern, the first terminal pattern, and the fourth terminal pattern; a second exposed portion, which is exposed from the upper surface; a third exposed portion, which is exposed from the first side surface; and a fourth exposed portion, which is exposed from the second side surface. Therefore, even when the outer diameter of the first to third coil patterns is designed to be large, it is difficult for the magnetic filler contained in the magnetic element to detach.
[0080] Alternatively, in the coil component described above, the first exposed portion includes the area with the shortest distance between the first, second, and third coil patterns and the mounting surface; the second exposed portion includes the area with the shortest distance between the first, second, and third coil patterns and the upper surface; the third exposed portion includes the area with the shortest distance between the first, second, and third coil patterns and the first side surface; and the fourth exposed portion includes the area with the shortest distance between the first, second, and third coil patterns and the second side surface. This makes it more difficult for the magnetic filler contained in the magnetic element to detach.
[0081] Alternatively, in the coil component described above, the exposed width of the first exposed portion along a first direction perpendicular to the first and second side surfaces is greater than the exposed width of the second exposed portion along the first direction. This prevents the magnetic filler from falling off the mounting surface side.
[0082] Alternatively, in the aforementioned coil component, the first, second, and third coil patterns may include: a first section extending along the upper surface; a second section extending along a first side; and a third section extending along a second side. The curvature of the first section is greater than the curvature of the second and third sections, and the exposed width of the second exposed portion along the first direction is greater than the exposed width of the third exposed portion along the second direction perpendicular to the mounting surface and the upper surface, and the exposed width of the fourth exposed portion along the second direction. This can suppress the magnetic filler from detaching from the upper surface side, where magnetic filler is more prone to detachment.
[0083] Alternatively, in the coil component described above, the thickness of the second exposed portion in the second direction is thinner than the thickness of each of the third and fourth exposed portions in the first direction. This suppresses the shedding of the magnetic filler and ensures the volume of the magnetic element.
[0084] Alternatively, in the coil component described above, the second exposed portion may be disposed offset toward the first side. This allows the second exposed portion to be used as a directional marker.
[0085] The aforementioned coil component may further include: a first terminal electrode disposed on the mounting surface in contact with the outer peripheral end of the first coil pattern, the second terminal pattern, and the third terminal pattern; and a second terminal electrode disposed on the mounting surface in contact with the outer peripheral end of the second coil pattern, the first terminal pattern, and the fourth terminal pattern. This facilitates surface mounting onto the circuit board.
[0086] In the coil component described above, a portion of the first and second terminal electrodes may also cover the first exposed portion. This increases the area of the first and second terminal electrodes.
Claims
1. A coil component, wherein, have: A magnetic element having a mounting surface, an upper surface located on the opposite side of the mounting surface, and first and second side surfaces orthogonal to the mounting surface and the upper surface and located on opposite sides of each other; The coil portion, embedded in the magnetic element, is composed of a plurality of conductor layers stacked in a stacking direction parallel to the mounting surface, the upper surface, and the first and second side surfaces; and An insulating resin is located between the magnetic element and the coil portion. The plurality of conductor layers includes a first conductor layer, a second conductor layer, and one or more third conductor layers located between the first conductor layer and the second conductor layer. The first conductor layer includes: a first coil pattern, the outer peripheral end of which, exposed from the mounting surface, constitutes one end of the coil portion; and a first terminal pattern, exposed from the mounting surface. The second conductor layer includes: a second coil pattern, the outer peripheral end of which, exposed from the mounting surface, constitutes the other end of the coil portion; and a second terminal pattern, exposed from the mounting surface. The third conductor layer includes: a third coil pattern, one end of which is connected to one end of the coil portion via the first coil pattern, and the other end of which is connected to the other end of the coil portion via the second coil pattern; and third and fourth terminal patterns exposed from the mounting surface. The insulating resin on the mounting surface includes: a first exposed portion that is exposed from the region between the outer peripheral end of the first coil pattern, the second terminal pattern, and the third terminal pattern and the outer peripheral end of the second coil pattern, the first terminal pattern, and the fourth terminal pattern; a second exposed portion that is exposed from the upper surface; a third exposed portion that is exposed from the first side surface; and a fourth exposed portion that is exposed from the second side surface.
2. The coil component according to claim 1, wherein, The first exposed portion includes the area where the distance between the first, second, and third coil patterns and the mounting surface is shortest. The second exposed portion includes the area where the distance between the first, second, and third coil patterns and the upper surface is shortest. The third exposed portion includes the area where the distance between the first, second, and third coil patterns and the first side is the shortest. The fourth exposed portion includes the area where the distance between the first, second, and third coil patterns and the second side is the shortest.
3. The coil component according to claim 2, wherein, The exposed width of the first exposed portion along a first direction perpendicular to the first and second sides is greater than the exposed width of the second exposed portion along the first direction.
4. The coil component according to claim 3, wherein, The first, second, and third coil patterns each include: a first section extending along the upper surface; a second section extending along the first side; and a third section extending along the second side. The curvature of the first interval is greater than the curvature of the second and third intervals. The exposed width of the second exposed portion along the first direction is greater than the exposed width of the third exposed portion along the second direction perpendicular to the mounting surface and the upper surface, and the exposed width of the fourth exposed portion along the second direction.
5. The coil component according to claim 4, wherein, The thickness of the second exposed portion in the second direction is thinner than the thickness of the third and fourth exposed portions in the first direction.
6. The coil component according to claim 1, wherein, The second exposed portion is disposed offset toward the first side.
7. The coil component according to any one of claims 1 to 6, wherein, It also has: A first terminal electrode is disposed on the mounting surface in such a manner that it contacts the outer peripheral end of the first coil pattern, the second terminal pattern, and the third terminal pattern; as well as The second terminal electrode is disposed on the mounting surface in such a manner that it contacts the outer peripheral end of the second coil pattern, the first terminal pattern, and the fourth terminal pattern.
8. The coil component according to claim 7, wherein, A portion of the first and second terminal electrodes covers the first exposed portion.