Coil component and method of manufacturing the same

Abstract

The technical problem of the present application is to reduce the number of connection points included in a coil pattern in a coil component having a structure in which a spiral coil pattern is embedded in a resin body. A coil component (1) of the present application includes a coil pattern (C) embedded in a resin body (10). The resin body (10) includes a winding core region (11) surrounded by the coil pattern (C), and a peripheral region (13) covering the periphery of a first surface (11a) of the winding core region (11). The coil pattern (C) includes a plurality of first sections (31 to 34) extending continuously along a first surface (11a) of the winding core region (11), and a plurality of second sections (41 to 45) extending continuously along a second surface (11b) of the winding core region (11), and end portions of the first sections (31 to 34) and end portions of the second sections (41 to 45) corresponding to the first sections (31 to 34) are connected to each other. Thus, the number of connection points of each turn of the coil pattern is two, and the number of connection points included in the coil pattern can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to a coil component and a manufacturing method thereof, and particularly relates to a coil component having a structure in which a spiral coil pattern is embedded in a resin body and a manufacturing method thereof. BACKGROUND

[0002] As a coil component having a structure in which a spiral coil pattern is embedded in a resin body, a coil component described in Patent Literature 1 is known.

[0003] PRIOR ART DOCUMENT

[0004] PATENT LITERATURE

[0005] Patent Literature 1: Japanese Patent Application Laid-Open No. 2006-324489 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, in the coil component described in Patent Literature 1, there are a plurality of connection points in the coil pattern, and thus the Q value can be reduced.

[0008] Therefore, an object of the present application is to reduce the connection points included in the coil pattern in a coil component having a structure in which a spiral coil pattern is embedded in a resin body.

[0009] METHOD FOR SOLVING THE PROBLEMS

[0010] The coil component of the present application includes a resin body, a coil pattern embedded in the resin body and spirally wound across a plurality of turns, and a first terminal electrode and a second terminal electrode provided on a surface of the resin body and connected to one end and the other end of the coil pattern, respectively. The resin body includes a winding core region surrounded by the coil pattern and having a first surface and a substantially flat second surface different in circumferential position from the first surface, and a first peripheral region covering the first surface of the winding core region. The coil pattern includes a plurality of first intervals continuously extending along the first surface of the winding core region, and a plurality of second intervals continuously extending along the second surface of the winding core region. One end of the plurality of first intervals and one end of the plurality of second intervals corresponding to the one end of the plurality of first intervals are connected to each other. The other end of the plurality of first intervals and the other end of the plurality of second intervals corresponding to the other end of the plurality of first intervals are connected to each other.

[0011] According to the present application, since the connection points of each turn of the coil pattern are two, the connection points included in the coil pattern can be reduced. Thus, the reliability is improved, and the Q value can be improved.

[0012] In the present application, the first surface of the winding core region can constitute a curved surface in the circumferential direction. Thus, the reliability of the first intervals of the coil pattern is improved.

[0013] In the present application, it can also be that the core region and the first surrounding region are composed of different resin-based insulating materials from each other. Thereby, the characteristics sought for the core region and the characteristics sought for the first surrounding region can be taken into account. In this case, it can also be that a filler is added in the first surrounding region and no filler is added in the core region. Thereby, the mechanical strength of the first surrounding region can be ensured and an ultraviolet-curable resin is used as the material of the core region.

[0014] In the present application, it can also be that the resin body further includes a second surrounding region that covers a second surface of the core region to bury a plurality of second intervals, and the first terminal electrode and the second terminal electrode are provided on the second surrounding region, and the resin-based insulating material that constitutes the second surrounding region has a lower relative dielectric constant than the resin-based insulating material that constitutes the first surrounding region. Thereby, the stray capacitance generated between the first terminal electrode and the second terminal electrode and the coil pattern can be reduced.

[0015] In the present application, it can also be that the resin body further includes a third surrounding region that is provided between the first surface of the core region and the first surrounding region to bury a plurality of first intervals, and the resin-based insulating material that constitutes the third surrounding region has a lower relative dielectric constant than the resin-based insulating material that constitutes the first surrounding region. Thereby, the stray capacitance generated between adjacent turns of the coil pattern can be reduced.

[0016] In the present application, it can also be that the first terminal electrode and the second terminal electrode are arranged in the axial direction of the coil pattern. Thereby, since the potential difference between the first terminal electrode and the second terminal electrode and the coil pattern is suppressed, the stray capacitance can be further reduced.

[0017] In this case, it can also be that the first terminal electrode and the second terminal electrode are not formed on the surface of the resin body perpendicular to the axial direction, but are formed on the surface of the resin body along the axial direction. Thereby, since the magnetic flux is difficult to interfere with the first terminal electrode and the second terminal electrode, the generation of eddy current can be suppressed.

[0018] The manufacturing method of the coil component of the present application includes: a first step of forming a core region composed of a resin-based insulating material on a support; a second step of forming a plurality of first intervals of a coil pattern along a first surface of the core region; a third step of covering the plurality of first intervals and the first surface of the core region with a first surrounding region composed of a resin-based insulating material; a fourth step of exposing a second surface of the core region and one end and the other end of the plurality of first intervals by removing the support; and a fifth step of forming a plurality of second intervals of the coil pattern that connect the one end of the plurality of first intervals and the other end of the plurality of first intervals corresponding thereto.

[0019] According to the present invention, coil components with coil patterns having fewer connection points can be easily manufactured.

[0020] Alternatively, the method for manufacturing the coil component of the present invention may further include: a sixth step, forming a second surrounding region made of a resin-based insulating material on a second surface of the core region to embed a plurality of second intervals; and a seventh step, forming a first terminal electrode and a second terminal electrode respectively connected to one end and the other end of the coil pattern on the second surrounding region, wherein the resin-based insulating material constituting the second surrounding region has a lower relative permittivity than the resin insulating material constituting the first surrounding region. This reduces stray capacitance generated between the first terminal electrode, the second terminal electrode, and the coil pattern.

[0021] Alternatively, the method for manufacturing the coil component of the present invention may further include: after performing the second step and before performing the third step, forming a third surrounding region made of a resin-based insulating material on the first surface of the core region to embed a plurality of first intervals, wherein the resin-based insulating material constituting the third surrounding region has a lower relative permittivity than the resin-based insulating material constituting the first surrounding region. This reduces stray capacitance generated between adjacent turns of the coil pattern.

[0022] Invention Effects

[0023] According to the present invention, in a coil component having a structure in which a spiral coil pattern is embedded in a resin body, the number of connection points contained in the coil pattern can be reduced. Attached Figure Description

[0024]

Figure 1

[0025]

Figure 2

[0026]

Figure 3

[0027]

Figure 4

[0028]

Figure 5

[0029]

Figure 6

[0030]

Figure 7

[0031]

Figure 8

[0032]

Figure 9

[0033]

Figure 10

[0034]

Figure 11

[0035]

Figure 12

[0036]

Figure 13

[0037] Symbol Explanation

[0038] 1-3 Coil Components

[0039] 10 Resin Body

[0040] 11 Core Area

[0041] 11a First surface of the core region

[0042] 11b The second surface of the core area

[0043] 12-14 Surrounding Area

[0044] 31-34, Interval 1

[0045] 31a~34a One end of the first interval

[0046] 31b~34b, the other end of the first interval

[0047] 41-45, second interval

[0048] One end of the second interval 41a~44a

[0049] The other end of the second interval 42b~45b

[0050] 71, 72 Through-hole conductors

[0051] 71a, 72a openings

[0052] 80 Support base plate

[0053] 81 Sacrificial Layer

[0054] 82 Support base plate

[0055] 83 Adhesive layer

[0056] C coil pattern

[0057] E1 and E2 terminal electrodes Detailed Implementation

[0058] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0059] <First Implementation>

[0060] Figure 1 These are general perspective views illustrating the structure of the coil component 1 according to the first embodiment of the present invention. (a) is a view viewed from the top surface side, and (b) is a view viewed from the mounting surface side. Furthermore, Figure 2 (a) is along Figure 1 (b) shows a rough cross-sectional view of line AA. Figure 2 (b) is along Figure 1 (b) shows a general cross-sectional view of the BB line.

[0061] The coil component 1 in the first embodiment is a surface-mountable chip-type electronic component, such as... Figure 1 and Figure 2 As shown, it includes: a resin body 10, a coil pattern C embedded in the resin body 10, and terminal electrodes E1 and E2 disposed on the surface of the resin body 10.

[0062] The resin body 10 is composed of a core region 11 and surrounding regions 12-14. The core region 11 is located in the area surrounded by the coil pattern C, and the surrounding regions 12-14 are located outside the coil pattern C. The core region 11 is made of a resin material that does not contain fillers such as UV-curable resins. Furthermore, the surrounding regions 12 and 14 are made of filler-free resin materials such as bismaleimide or liquid crystal polymers. The resin insulating materials constituting the surrounding regions 12 and 14 can be the same or different. In contrast, the surrounding region 13 is made of a resin insulating material in which fillers such as silica are added to an epoxy or acrylic resin material.

[0063] Therefore, the strength of the resin-based insulating material constituting the surrounding region 13 is higher than that of the resin-based insulating materials constituting the surrounding regions 12 and 14, and it also has better processability. On the other hand, since the resin-based insulating materials constituting the surrounding regions 12 and 14 are composed of resin materials with low relative permittivity and do not contain fillers such as silica, their relative permittivity is lower than that of the resin-based insulating material constituting the surrounding region 13. As an example, the relative permittivity ε of the resin-based insulating material constituting the surrounding region 13 at 1 GHz is approximately 3.3, while the relative permittivity ε of the resin-based insulating materials constituting the surrounding regions 12 and 14 at 1 GHz is approximately 2.4.

[0064] The core region 11 has a first surface 11a with a circular arcuate yz cross section and a second surface 11b forming a generally flat xy plane. A coil pattern C is wound on both the first surface 11a and the second surface 11b. The shape of the yz cross section of the first surface 11a is not particularly limited, but a semi-circular shape is preferred. Therefore, no corners are formed on the first surface 11a, making it easy to form the coil pattern C during the manufacturing process described later. In any case, since the first surface 11a is curved in the circumferential direction and the second surface 11b is generally flat, the first surface 11a has a larger area than the second surface 11b. Furthermore, since the circumferential positions of the first surface 11a and the second surface 11b are different from each other, the conductor patterns forming the coil pattern C are alternately arranged on the first surface 11a and the second surface 11b.

[0065] Figure 3 This is a general three-dimensional diagram used to illustrate the structure of the coil pattern C embedded in the resin substrate 10. Additionally, Figure 4 This is a general perspective top view showing the state of the coil pattern C as viewed from the z-direction.

[0066] like Figures 2-4As shown, the coil pattern C is composed of a first interval 31-34 disposed on the first surface 11a of the core region 11 and a second interval 41-45 disposed on the second surface 11b of the core region 11. Figure 2 As shown, the first intervals 31-34 are buried in the surrounding area 12, and the second intervals 41-45 are buried in the surrounding area 14. Furthermore, one end 31a-34a of the first intervals 31-34 is connected to one end 41a-44a of the second intervals 41-44, and the other end 31b-34b of the first intervals 31-34 is connected to the other end 42b-45b of the second intervals 42-45.

[0067] Based on the above structure, a coil pattern C is formed by spirally winding multiple turns. The coil axis of the coil pattern C is in the x-direction. The other end 41b of the second section 41 constitutes one end of the coil pattern C and is connected to the terminal electrode E1 via a through-hole conductor 71 provided through the surrounding area 14. On the other hand, one end 45a of the second section 45 constitutes the other end of the coil pattern C and is connected to the terminal electrode E2 via a through-hole conductor 72 provided through the surrounding area 14. The terminal electrodes E1 and E2 are bottom surface terminals formed only on the xy surfaces of the resin body 10. That is, the terminal electrodes E1 and E2 do not cover the yz surfaces of the resin body 10, so that when the resin body 10 is mounted on the circuit board using solder, the yz surfaces of the resin body 10 will not be covered by the fillet of the solder. As a result, the mounting density can be increased, and the magnetic flux generated by the coil pattern C is less likely to interfere with the terminal electrodes E1 and E2 and the solder, thus suppressing the generation of eddy currents.

[0068] like Figure 4 As shown, terminal electrode E1 overlaps at least with the second section 41, and terminal electrode E2 overlaps at least with the second section 45. Therefore, stray capacitance is generated between terminal electrode E1 and the second section 41, and between terminal electrode E2 and the second section 45. However, in this embodiment, since the surrounding region 14 located between them is made of a resin-based insulating material with a relatively low permittivity, the stray capacitance generated between terminal electrodes E1, E2 and the second sections 41, 45 can be reduced. Furthermore, since the second sections 41-45 are embedded in the surrounding region 14, the stray capacitance between adjacent second sections 41-45 in the x-direction can be reduced, that is, the stray capacitance generated between adjacent turns of the coil pattern C. Thus, the reduction in self-resonant frequency (SRF) caused by stray capacitance can be prevented.

[0069] Furthermore, in this embodiment, terminal electrode E1 overlaps with a portion of the second section 42, and terminal electrode E2 overlaps with a portion of the second section 44. Therefore, stray capacitance is generated between terminal electrode E1 and the second section 42, and between terminal electrode E2 and the second section 44. Here, since the wiring distance from the second section 42 to terminal electrode E1 is greater than that from the second section 41, the stray capacitance per unit area of ​​terminal electrode E1 and the second section 42 is greater than that of terminal electrode E1 and the second section 41 due to voltage drop. Similarly, since the wiring distance from the second section 44 to terminal electrode E2 is greater than that from the second section 45, the stray capacitance per unit area of ​​terminal electrode E2 and the second section 44 is greater than that of terminal electrode E2 and the second section 45 due to voltage drop. As described above, when each of the terminal electrodes E1 and E2 overlaps with multiple second intervals 41 to 45, it is more effective to use a resin-based insulating material with a low relative permittivity as the material for the surrounding region 14.

[0070] Furthermore, in this embodiment, since the first intervals 31 to 34 are embedded in the surrounding region 12, and the surrounding region 12 is made of a resin-based insulating material with a relatively low permittivity, the stray capacitance between adjacent first intervals 31 to 34 in the x-direction can be reduced, that is, the stray capacitance generated between adjacent turns of the coil pattern C.

[0071] On the other hand, the surrounding area 13 of the first surface 11a covering the core area 11 is made of a high-strength resin-based insulating material, thus ensuring sufficient mechanical strength of the resin body 10 as a whole.

[0072] As described above, the coil component 1 of this embodiment has a structure in which a coil pattern C is wound around a core region 11, and the first intervals 31 to 34 formed on the first surface 11a of the core region 11 are interconnected with the second intervals 41 to 45 formed on the second surface 11b of the core region 11. Therefore, the number of connection points contained in the coil pattern C can be reduced. As an example, in this embodiment, the coil pattern C has 4 turns and 8 connection points. As described above, since the number of connection points contained in the coil pattern C is small, the reliability is improved and the Q value is increased.

[0073] Furthermore, in this embodiment, the coil pattern C has a portion covered by surrounding regions 12 and 14 made of a resin-based insulating material with a relatively low permittivity, and most of the coil pattern C is covered by surrounding region 13 made of a resin-based insulating material with high strength. Therefore, the mechanical strength of the resin body 10 can be ensured, and the reduction of the self-resonant frequency caused by stray capacitance can be prevented.

[0074] Furthermore, in this embodiment, since terminal electrodes E1 and E2 are arranged along the axial direction (x-direction) of the coil pattern C, terminal electrode E1 does not overlap with the second intervals (e.g., second intervals 44 and 45) with a large wiring distance, and similarly, terminal electrode E2 does not overlap with the second intervals (e.g., second intervals 41 and 42) with a large wiring distance. Therefore, since the potential difference between terminal electrodes E1 and E2 and the overlapping second intervals 41, 42, 44, and 45 is suppressed, stray capacitance can be further reduced compared to the case where terminal electrodes E1 and E2 are arranged in the y-direction.

[0075] Next, the manufacturing method of the coil component 1 in this embodiment will be described.

[0076] Figures 5-11 This is a process diagram illustrating the manufacturing method of the coil component 1 in this embodiment. Figures 5-11 In the diagram, (a) is a rough three-dimensional view, (b) is a rough top view, and (c) is a rough cross-sectional view of the yz direction.

[0077] First, such as Figure 5 As shown, a support substrate 80 made of silicon, quartz, etc., is prepared, and a sacrificial layer 81 is formed on its surface. The sacrificial layer 81 may also be, for example, a laminate of Cr and Cu. Next, an ultraviolet-curable resin is coated on the surface of the sacrificial layer 81, and the core region 11 is formed by exposure. At this time, since the uncured ultraviolet-curable resin is not coated on the entire surface of the sacrificial layer 81, but only partially, the surface of the ultraviolet-curable resin becomes arc-shaped due to surface tension. Therefore, the surface of the cured core region 11 (first surface 11a) also becomes arc-shaped. The bottom surface of the core region 11 (second surface 11b) is substantially flat because it is located on the flat sacrificial layer 81.

[0078] Next, as Figure 6 As shown, first intervals 31 to 34 are formed on the first surface 11a of the core region 11. The formation of the first intervals 31 to 34 can be performed by the following steps: after forming a thin power supply film on the entire surface of the first surface 11a of the core region 11, a photosensitive resist is applied using a spraying method or similar method; openings are formed in the photosensitive resist through exposure and development; and the first intervals 31 to 34 are grown at the openings through electroplating. This forms the first intervals 31 to 34 that continuously extend along the first surface 11a of the core region 11. Here, since the first surface 11a of the core region 11 is curved in the circumferential direction and does not have corners, it is difficult for breaks or film thickness deviations to occur in the first intervals 31 to 34.

[0079] Next, as Figure 7As shown, a surrounding region 12 is formed on the first surface 11a of the core region 11 to embed the first intervals 31 to 34. Thus, adjacent first intervals 31 to 34 in the x-direction are insulated by a resin-based insulating material with a relatively low permittivity. The film thickness of the surrounding region 12 is sufficient to embed the surrounding region 12 between adjacent first intervals 31 to 34 in the x-direction; a thicker film is not required. Therefore, the surface of the surrounding region 12 reflects the shape of the first surface 11a of the core region 11 and is arc-shaped. Next, as... Figure 8 As shown, after forming the surrounding region 13 that covers the surrounding region 12, the surface is planarized. Thus, the first surface 11a of the core region 11 is covered by the high-strength surrounding region 13 via the first intervals 31-34 and the surrounding region 12. The film thickness of the surrounding region 13 must be sufficient to planarize the xy-plane. That is, it must be thicker than the total height in the z-direction of the core region 11 and the surrounding region 12.

[0080] Next, as Figure 9 As shown, after another support substrate 82 made of glass or silicon is bonded to the upper surface of the planarized surrounding area 13 via an adhesive layer 83, the support substrate 80 and the sacrificial layer 81 are removed. As a result, one end 31a to 34a and the other end 31b to 34 of the second surface 11b of the core area 11 and the first intervals 31 to 34 are exposed.

[0081] Next, as Figure 10 As shown, second sections 41 to 45 are formed on the second surface 11b of the core region 11. The formation of the second sections 41 to 45 can be achieved by the following steps: after forming a thin power supply film over the entire surface, a photosensitive film is adhered; openings are formed on the photosensitive film through exposure and development; and the second sections 41 to 45 are grown at the openings through electroplating. Thus, one end 31a to 34a of the first sections 31 to 34 is connected to one end 41a to 44a of the second sections 41 to 44, respectively, and the other end 31b to 34b of the first sections 31 to 34 is connected to the other end 42b to 45b of the second sections 42 to 45, respectively. Since the connection is performed on a flat surface, high connection reliability can be achieved.

[0082] Next, as Figure 11As shown, a surrounding region 14 is formed across the entire surface to embed the second sections 41 to 45. Thus, adjacent second sections 41 to 45 in the x-direction are insulated by a resin-based insulating material with a relatively low permittivity. Next, openings 71a and 72a are formed in the surrounding region 14, exposing the other end 41b of the second section 41 and one end 45a of the second section 45. After forming terminal electrodes E1 and E2 at positions overlapping with the openings 71a and 72a, respectively, the coil component 1 of this embodiment is fabricated by removing the support substrate 82 and the adhesive layer 83.

[0083] As described above, in the manufacturing method of the coil component 1 in this embodiment, a first interval 31 to 34 is formed on the first surface 11a of the core region 11. After the first surface 11a of the core region 11 is covered by the surrounding regions 12 and 13, the second surface 11b of the core region 11 is exposed by removing the support substrate 80, and a second interval 41 to 45 is formed on the second surface 11b of the core region 11. Therefore, a coil pattern C with a connection point of 2 for each turn can be formed.

[0084] <Second Implementation Method>

[0085] Figure 12 This is a general cross-sectional view used to illustrate the structure of the coil component 2 according to the second embodiment of the present invention.

[0086] like Figure 12 As shown, the coil component 2 of the second embodiment differs from the coil component 1 of the first embodiment in that the surrounding region 12 is omitted. Since the other basic structures are the same as those of the coil component 1 of the first embodiment, the same reference numerals are used for the same elements, and repeated descriptions are omitted. As exemplified by the coil component 2 of this embodiment, it is not necessary for the first interval 31 to 34 to be covered by a resin-based insulating material with a relatively low permittivity in this invention.

[0087] <Third Implementation Method>

[0088] Figure 13 This is a general cross-sectional view used to illustrate the structure of the coil component 3 according to the third embodiment of the present invention.

[0089] like Figure 13 As shown, the coil component 3 of the third embodiment differs from the coil component 1 of the first embodiment in that the surrounding region 14 is made of the same resin-based insulating material as the surrounding region 13. Since the other basic structures are the same as those of the coil component 1 of the first embodiment, the same reference numerals are assigned to the same elements, and repeated descriptions are omitted. As shown in the coil component 3 of this embodiment, it is not necessary for the second interval 41 to 44 to be covered by a resin-based insulating material with a relatively low permittivity in this invention.

[0090] The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. Various modifications can be made without departing from the spirit of the present invention, and these modifications are also included within the scope of the present invention.

Claims

1. A coil component, characterized in that, have: Resin body; A coil pattern, embedded in the resin body, is wound in a spiral shape across multiple turns; and The first terminal electrode and the second terminal electrode are disposed on the surface of the resin body and are respectively connected to one end and the other end of the coil pattern. The resin body includes: a core region surrounded by the coil pattern, having a first surface and a generally flat second surface with a circumferential position different from the first surface; and a first surrounding region covering the first surface of the core region. The coil pattern includes: a plurality of first intervals extending continuously along the first surface of the core region; and a plurality of second intervals extending continuously along the second surface of the core region. One end of each of the plurality of first intervals and one end of the plurality of corresponding second intervals are interconnected. The other ends of the plurality of first intervals and the other ends of the plurality of corresponding second intervals are interconnected. The first terminal electrode overlaps with a portion of the plurality of second intervals, and the second terminal electrode overlaps with another portion of the plurality of second intervals. The resin body further includes: a second surrounding region covering the second surface of the core region to embed the plurality of second intervals. The first terminal electrode and the second terminal electrode are disposed on the area surrounding the second terminal electrode. The resin-based insulating material constituting the second surrounding region has a lower relative permittivity than the resin-based insulating material constituting the first surrounding region.

2. The coil component according to claim 1, characterized in that, The first surface of the core region forms a curved surface in the circumferential direction.

3. The coil component according to claim 1, characterized in that, The core region and the first surrounding region are made of different resin-based insulating materials.

4. The coil component according to claim 3, characterized in that, Filler was added to the area surrounding the first region, but no filler was added to the core region.

5. The coil component according to claim 1, characterized in that, The resin body further includes a third surrounding region, disposed between the first surface and the first surrounding region of the core region, to embed the plurality of first intervals. The resin-based insulating material constituting the third surrounding region has a lower relative permittivity than the resin-based insulating material constituting the first surrounding region.

6. The coil component according to any one of claims 1 to 5, characterized in that, The first terminal electrode and the second terminal electrode are arranged axially in the coil pattern.

7. The coil component according to claim 6, characterized in that, The first terminal electrode and the second terminal electrode are not formed on the surface of the resin body perpendicular to the axial direction, but are formed on the surface of the resin body along the axial direction.

8. A method for manufacturing a coil component, characterized in that, have: The first step involves forming a core area made of resin-based insulating material on the support. The second step involves forming a plurality of first intervals of a coil pattern along the first surface of the core region; The third step involves covering the first surface of the plurality of first intervals and the core region with a first surrounding area made of a resin-based insulating material; In the fourth step, the support body is removed to expose the second surface of the core area and one and the other ends of the plurality of first sections. as well as Step 5: Forming a plurality of second intervals of the coil pattern that connect one end of the plurality of first intervals and the other end of the plurality of first intervals thereto.

9. The method for manufacturing a coil component according to claim 8, characterized in that, It also has: In the sixth step, a second surrounding area made of resin-based insulating material is formed on the second surface of the core region to embed the plurality of second intervals. as well as In the seventh step, a first terminal electrode and a second terminal electrode, respectively connected to one end and the other end of the coil pattern, are formed on the second surrounding area. The resin-based insulating material constituting the second surrounding region has a lower relative permittivity than the resin-based insulating material constituting the first surrounding region.

10. The method for manufacturing a coil component according to claim 8 or 9, characterized in that, It also has: After the second step and before the third step, a third surrounding area made of resin-based insulating material is formed on the first surface of the core region to embed the plurality of first sections. The resin-based insulating material constituting the third surrounding region has a lower relative permittivity than the resin-based insulating material constituting the first surrounding region.

11. A coil component, characterized in that, include: The first resin component has a semi-circular arc shape including curved and flat surfaces; A coil pattern, wound in multiple turns around the first resin component; and The first terminal electrode and the second terminal electrode are respectively connected to one end and the other end of the coil pattern. Each turn of the coil pattern has: a first section formed on the curved surface of the first resin member; and a second section formed on the flat surface of the first resin member. The first terminal electrode overlaps with a portion of the coil pattern, and the second terminal electrode overlaps with another portion of the coil pattern. Also includes: A second resin component is formed on the curved surface of the first resin component to embed the first section of the coil pattern; A third resin component is formed on the second resin component; and A fourth resin component, formed on the flat surface of the first resin component, is used to embed the second section of the coil pattern. The relative permittivity of the second resin component is lower than that of the third resin component. The fourth resin component has a lower relative permittivity than the third resin component.

12. The coil component according to claim 11, characterized in that, The first resin component, the second resin component, and the third resin component are made of different materials.

13. The coil component according to claim 11, characterized in that, Also includes: The first terminal electrode and the second terminal electrode are formed on the third resin component.

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