Coil component

Abstract

The present invention relates to a coil component. The present invention aims to suppress a decrease in impedance in a high-frequency band of a coil component caused by a parasitic capacitance. A first end of a wire (30) is connected to a first terminal electrode (21). The wire (30) has a portion extending in a spiral shape on a peripheral surface (11F) of a winding core portion (11) with a center axis (CA) as a rotation axis. In the wire (30), a range from a first position (P1) connected to the first terminal electrode (21) to a second position (P2) wound one turn around the center axis (CA) is set as a first wire range (WA1). The wire (30) has a first connection position (CP1) connected to a top plate (40) via an adhesive (50) within the first wire range (WA1). At the first connection position (CP1), the wire (30) is separated from the peripheral surface (11F) of the winding core portion (11).

Description

Technical Field

[0001] This invention relates to coil components. Background Technology

[0002] Patent Document 1 describes a coil component comprising a core portion having a central axis, a first flange portion, a second flange portion, and a wire. The core portion is prism-shaped. The first flange portion is connected to a first end of the core portion. The first flange portion protrudes radially outward from the circumference of the core portion about the central axis. The second flange portion is connected to a second end of the core portion. The second flange portion protrudes radially outward from the circumference of the core portion about the central axis. Furthermore, the wire extends in a spiral shape on the circumference of the core portion about the central axis of the core portion. In addition, in the spirally extending portion, the wire extends adjacently in the direction along the central axis.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2018-010999

[0004] In the coil component described in Patent Document 1, the turns of a wire are adjacent to each other in the direction along the central axis. Therefore, parasitic capacitance is generated between the turns of the wire. If the parasitic capacitance between the turns is too large, there is a concern that the characteristics of the coil component will deteriorate. More specifically, the impedance in the high-frequency band will decrease. Summary of the Invention

[0005] To address the aforementioned issues, one aspect of this disclosure is to provide a coil component comprising: a core; a wire having a portion extending spirally about a central axis as a rotation axis on the circumferential surface of the core portion; a first terminal electrode connected to a first end of the wire and disposed on the surface of a first flange portion; a second terminal electrode connected to a second end of the wire and disposed on the surface of a second flange portion; and a top plate extending longer than the core portion in the direction along the central axis and connected to the first flange portion and the second flange portion. The core comprises: the core portion having the central axis; the first flange portion connected to a first end of the core portion in the direction along the central axis and protruding radially outward from the circumferential surface of the core portion about the central axis; and the second flange portion connected to the first end of the core portion. The second end is connected on the opposite side and protrudes radially outward from the circumferential surface of the core portion about the central axis. When the axis orthogonal to the central axis is defined as the orthogonal axis, one of the two directions along the orthogonal axis is defined as the positive direction, and the opposite direction of the positive direction is defined as the negative direction, the top plate is connected to the positive end of the first flange portion and the positive end of the second flange portion. The first terminal electrode is located at the negative end of the surface of the first flange portion. When the range from the part connected to the first terminal electrode to the part that is wound around the central axis is defined as the first wire range, the wire has a connection part connected to the top plate within the first wire range. At the connection part, the wire is separated from the circumferential surface of the core portion.

[0006] According to the above structure, the area near the connection point between the wire and the top plate is separated from the portion of the wire extending on the circumferential surface of the core. Therefore, the parasitic capacitance generated near the connection point between the wire and the top plate can be reduced. As a result, the deterioration of the coil components' characteristics caused by parasitic capacitance can be suppressed.

[0007] To address the aforementioned issues, one aspect of this disclosure is to provide a coil component comprising: a core; a wire having a portion extending spirally about a central axis on the circumferential surface of the core portion; a first terminal electrode connected to a first end of the wire and disposed on the surface of a first flange portion; a second terminal electrode connected to a second end of the wire and disposed on the surface of a second flange portion; and a top plate extending longer than the core portion in the direction along the central axis and connected to the first flange portion and the second flange portion. The core comprises: the core portion having the central axis; the first flange portion connected to a first end of the core portion in the direction along the central axis and protruding radially outward from the circumferential surface of the core portion about the central axis; and the second flange portion connected to the first end of the core portion in the same direction as the first flange portion. The second end is connected to the opposite side of the first end and protrudes radially outward from the circumferential surface of the core portion about the central axis. When the axis orthogonal to the central axis is defined as the orthogonal axis, one of the two directions along the orthogonal axis is defined as the positive direction, and the opposite direction of the positive direction is defined as the negative direction, the top plate is connected to the positive end of the first flange portion and the positive end of the second flange portion. The first terminal electrode is located at the negative end of the surface of the first flange portion. When the range from the part connected to the first terminal electrode to the part that is wound around the central axis is defined as the first wire range, the wire has a contact portion that contacts the top plate within the first wire range. At the contact portion, the wire separates from the circumferential surface of the core portion.

[0008] According to the above structure, the area near the contact point between the wire and the top plate is separated from the portion of the wire extending on the circumferential surface of the core. Therefore, the parasitic capacitance generated near the contact point between the wire and the top plate can be reduced. As a result, the deterioration of the coil components caused by parasitic capacitance can be suppressed.

[0009] To address the aforementioned issues, one aspect of this disclosure is to provide a coil component comprising: a core; a wire having a portion extending spirally about a central axis on the circumferential surface of the core portion; a first terminal electrode connected to a first end of the wire and disposed on the surface of a first flange portion; and a second terminal electrode connected to a second end of the wire and disposed on the surface of a second flange portion. The core includes: the core portion having the central axis; the first flange portion connected to a first end of the core portion along the central axis and protruding radially outward from the circumferential surface of the core portion about the central axis; and the second flange portion extending radially outward from the circumferential surface of the core portion. The second end is connected to the opposite side of the first end and protrudes radially outward from the circumferential surface of the core portion about the central axis. When the axis orthogonal to the central axis is defined as the orthogonal axis, one of the two directions along the orthogonal axis is defined as the positive direction, and the opposite direction of the positive direction is defined as the negative direction, the first terminal electrode is located at the negative direction end of the surface of the first flange portion. When the range of the wire from the part connected to the first terminal electrode to the part that is wound around the central axis is defined as the first wire range, when viewed from the central axis, the entire range of the positive direction side of the first wire range is separated from the core portion.

[0010] According to the above structure, when viewed from the central axis, the entire positive-direction side of the first wire section of the wire is separated from the core portion. Therefore, the resulting parasitic capacitance can be reduced over a correspondingly wide range. As a result, the characteristic deterioration of the coil components caused by parasitic capacitance can be suppressed.

[0011] It can suppress the decrease in impedance of coil components in the high-frequency band caused by parasitic capacitance. Attached Figure Description

[0012] Figure 1 This is a side view of the coil component.

[0013] Figure 2 yes Figure 1 A bottom view of the coil component.

[0014] Figure 3 It is along Figure 2 A sectional view along line 3-3 in the diagram.

[0015] Figure 4 It is along Figure 3 The sectional view along line 4-4.

[0016] Figure 5 This is a bottom view of the top panel.

[0017] Figure 6This is an explanatory diagram illustrating the thickness of the film.

[0018] Figure 7 This is an explanatory diagram illustrating the thin section of the membrane.

[0019] Figure 8 This is an explanatory diagram used to illustrate the first wire range of the wire.

[0020] Figure 9 This is an explanatory diagram used to illustrate the second wire range of the wire.

[0021] Figure 10 This is a side view of the coil component in the modified example.

[0022] Figure 11 This is a side view of the coil component in the modified example.

[0023] Explanation of reference numerals in the attached figures

[0024] 10…coil component; 10C…core; 11…core portion; 11F…peripheral surface; 12…first flange portion; 13…second flange portion; 21…first terminal electrode; 22…second terminal electrode; 30…wire; 30A…first section; 30B…second section; 30C…central section; 40…top plate; 50…adhesive; CA…central axis; CD…core size; CP1…first connection portion; CP11…first contact portion; CP12…second contact portion; CP2…second connection portion; WA1…first wire range; WA2…second wire range. Detailed Implementation

[0025] <An embodiment of the coil component>

[0026] The following describes one embodiment of the coil component. Furthermore, the components are sometimes shown enlarged for ease of understanding in the accompanying drawings. The dimensional ratios of the components may differ from the actual dimensional ratios or those in other drawings. Additionally, while shading lines are indicated in sectional views, some shading lines for certain components are sometimes omitted for clarity.

[0027] (Overall structure)

[0028] like Figure 1 As shown, the coil component 10 includes a core 10C. The core 10C includes a winding core portion 11. The winding core portion 11 is a quadrangular prism. Therefore, the winding core portion 11 has a central axis CA and extends in the direction along the central axis CA. In addition, the winding core portion 11 has a circumferential surface 11F surrounding the central axis CA.

[0029] Furthermore, in the following description, the axis extending along the direction of the central axis CA will be designated as the first axis X. Additionally, as... Figure 2As shown, in the cross-section of the core portion 11 orthogonal to the central axis CA, the axis extending parallel to any one of the four sides constituting the quadrilateral is designated as the second axis Y. Furthermore, as... Figure 1 As shown, the axis orthogonal to the first axis X and the second axis Y is designated as the third axis Z. That is, the third axis Z is an orthogonal axis orthogonal to the central axis CA. Furthermore, one direction along the first axis X is designated as the first positive direction X1, and the other direction along the first axis X is designated as the first negative direction X2. Moreover, as... Figure 2 As shown, one direction along the second axis Y is designated as the second positive direction Y1, and the other direction along the second axis Y is designated as the second negative direction Y2. Additionally, as... Figure 1 As shown, one direction along the third axis Z is designated as the third positive direction Z1, and the other direction along the third axis Z is designated as the third negative direction Z2. That is, the opposite direction of the third positive direction Z1 is the third negative direction Z2.

[0030] like Figure 1 As shown, the core 10C also includes a first flange portion 12 and a second flange portion 13. The first flange portion 12 is connected to the end of the core portion 11 in the first positive direction X1, i.e., the first end. The first flange portion 12 protrudes radially outward from the circumferential surface 11F of the core portion 11, centered on the central axis CA. Figure 2 As shown, the amount of protrusion from the circumferential surface 11F of the core portion 11 is the same in both the second positive direction Y1 and the second negative direction Y2. On the other hand, as... Figure 1 As shown, the amount of protrusion from the circumferential surface 11F of the core portion 11 in the third negative direction Z2 is greater than the amount of protrusion from the circumferential surface 11F of the core portion 11 in the third positive direction Z1. In other words, the center of the first flange portion 12 in the direction along the third axis Z is offset in the third negative direction Z2 than the central axis CA of the core portion 11.

[0031] The second flange portion 13 is connected to the end of the core portion 11 in the first negative direction X2, i.e., the second end. The second flange portion 13 has a shape that is symmetrical with the first flange portion 12 in the direction along the first axis X, with the core portion 11 as a boundary. The cross sections of the first flange portion 12 and the second flange portion 13 that are orthogonal to the central axis CA of the core portion 11 are quadrilaterals.

[0032] The core 10C is made of a non-conductive material. Materials for the core 10C include, for example, aluminum oxide, nickel-zinc ferrite, resin, or mixtures thereof.

[0033] In addition, such as Figure 3 As shown, the dimension from the end of the core portion 11 in the third positive direction Z1 to the end of the first flange portion 12 in the third negative direction Z2 is defined as the core size CD. In this case, the core size CD is, for example, 1 mm or less.

[0034] The coil component 10 has a first terminal electrode 21 and a second terminal electrode 22.

[0035] like Figure 3 As shown, the first terminal electrode 21 is located on the surface of the first flange portion 12. Specifically, it is located on the surface of the end of the first flange portion 12 in the third negative direction Z2.

[0036] The second terminal electrode 22 is located on the surface of the second flange portion 13. Specifically, it is located on the surface of the end of the second flange portion 13 in the third negative direction Z2.

[0037] The first terminal electrode 21 and the second terminal electrode 22 are composed of a silver metal layer and a copper, nickel, and tin plating layer applied to the surface of the metal layer. In this embodiment, in the coil component 10, the surface of the first terminal electrode 21 and the second terminal electrode 22, that is, the surface facing the third negative direction Z2, is the surface that faces the substrate when the coil component 10 is mounted on the substrate.

[0038] like Figure 1 As shown, the coil component 10 includes a wire 30. A first end of the wire 30 is connected to a first terminal electrode 21. A second end of the wire 30 is connected to a second terminal electrode 22. The wire 30 has a portion that extends spirally on the circumferential surface 11F of the core portion 11 about a central axis CA as a rotation axis.

[0039] like Figure 3 As shown, the diameter of wire 30 is defined as wire diameter WD. The wire diameter WD is 5% to 20% of the core size CD. Further details about wire 30 will be described later.

[0040] The coil component 10 includes a top plate 40. The top plate 40 is a rectangular plate that is longer along the first axis X than along the second axis Y. The top plate 40 is connected to the end of the core 10C in the third positive direction Z1. That is, the top plate 40 is connected to the end of the core 10C opposite to the end where the first terminal electrode 21 and the second terminal electrode 22 are disposed. The top plate 40 is connected to the core 10C such that it is mounted on the end face of the first flange portion 12 in the third positive direction Z1 and the end face of the second flange portion 13 in the third positive direction Z1. Therefore, the dimension of the top plate 40 along the first axis X is larger than the dimension of the winding core portion 11 along the first axis X. In other words, the top plate 40 extends longer than the winding core portion 11 in the direction along the central axis CA. Furthermore, as... Figure 2 As shown, the dimensions of the top plate 40 along the second axis Y are approximately the same as the dimensions of the first flange portion 12 and the second flange portion 13 along the second axis Y.

[0041] Here, the surface roughness of the core 10C and the surface roughness of the top plate 40 will be explained. The following values ​​are obtained by measuring the surface of the top plate 40 facing the third negative direction Z2 and the surface of the first flange portion 12 facing the third positive direction Z1, respectively.

[0042] Regarding the surface roughness of core 10C, the unfolded area ratio Sdr of the core 10C surface is 0.08. The arithmetic mean Spc of the peak vertices TP of the core 10C surface is 2160. The arithmetic mean height Sa of the core 10C surface is 0.40. These values ​​were measured non-contactly according to the standard specified in ISO 25178.

[0043] On the other hand, regarding the surface roughness of the top plate 40, the unfolded area ratio Sdr of the surface of the top plate 40 is 0.19. The arithmetic mean Spc of the peaks TP of the surface of the top plate 40 is 2860. The arithmetic mean height Sa of the surface of the top plate 40 is 0.28. Therefore, the unfolded area ratio Sdr of the surface of the top plate 40 is greater than 0.15 and less than 0.50. In addition, the unfolded area ratio Sdr of the surface of the top plate 40 is larger than the unfolded area ratio Sdr of the surface of the core 10C.

[0044] Thus, both the core 10C and the top plate 40 have a certain degree of roughness. Moreover, the surface roughness of the top plate 40 is greater than that of the core 10C.

[0045] like Figure 1 As shown, the top plate 40 is connected to the first flange portion 12 and the second flange portion 13 via adhesive 50. On the other hand, the adhesive 50 does not contact the core portion 11. The adhesive 50 is divided into a first adhesive portion 51 that connects the top plate 40 to the first flange portion 12, and a second adhesive portion 52 that connects the top plate 40 to the second flange portion 13. The adhesive 50 is a thermosetting adhesive, for example, made of epoxy resin.

[0046] (First adhesive portion and second adhesive portion)

[0047] like Figure 4 As shown, the first adhesive portion 51 connects the first flange portion 12 to the top plate 40. Additionally, as... Figure 5 As shown, the first adhesive portion 51 is located on the surface of the top plate 40 facing the third negative direction Z2, at a position closer to the first positive direction X1 than the center along the first axis X.

[0048] Moreover, such as Figure 3 and Figure 4 As shown, the first adhesive portion 51 wets and expands within a first region A11 of the surface of the top plate 40 facing the third negative direction Z2. (As shown) Figure 5As shown, in the first range A11, the first adhesive portion 51 has a first film thickness portion 51A and a first film thin portion 51B.

[0049] like Figure 6 As shown, the first film thickness portion 51A is a portion of the surface of the top plate 40 having a roughness, having a thickness from the peak TP to a position separated from the surface. The first film thickness portion 51A is located in the surface of the top plate 40 facing the third negative direction Z2, at a position closer to the first positive direction X1 than the center of the top plate 40 along the first axis X.

[0050] On the other hand, the first thin film portion 51B is a portion on the surface of the roughened top plate 40 that does not have a thickness extending up to the peak TP. That is, as... Figure 7 As shown, although the first film thin portion 51B wets and spreads on the surface of the roughened top plate 40 in the valley between peaks TP, the peaks TP of the top plate 40 are not covered. Additionally, as... Figure 5 As shown, when viewed from the direction along the third axis Z, the first thin film portion 51B surrounds the first thick film portion 51A. Moreover, the end of the first thin film portion 51B in the first negative direction X2 does not reach the center of the top plate 40 in the direction along the first axis X.

[0051] like Figure 4 As shown, the surface of the first flange portion 12 facing the third positive direction Z1 is opposite to a portion of the first film thin portion 51B of the first adhesive portion 51. Furthermore, as... Figure 3 and Figure 4 As shown, the first flange portion 12 is connected to the top plate 40 via a portion of the first film thickness portion 51A in the first adhesive portion 51. Therefore, as Figure 5 As shown, the area on the surface of the first flange portion 12 where the adhesive 50 exists, i.e., the second area A21, is smaller than the area in the first adhesive portion 51 where the first film thickness portion 51A exists. Therefore, the first area A11 is larger than the second area A21.

[0052] In addition, such as Figure 3 As shown, the second adhesive portion 52 wets and expands in the third region A12 of the surface of the top plate 40 facing the third negative direction Z2. Figure 5 As shown, in the third region A12, the second adhesive portion 52 has a second film thickness portion 52A and a second film thin portion 52B.

[0053] When viewed from the direction along the third axis Z, the second adhesive portion 52 is symmetrical to the first adhesive portion 51 about an axis parallel to the second axis Y, passing through the center of the top plate 40 along the first axis X. Therefore, the second film thickness portion 52A, like the first film thickness portion 51A, is a portion on the surface of the roughened top plate 40 with a thickness from the peak TP to the position where it separates from the surface. The second film thickness portion 52A is located in the surface of the top plate 40 facing the third negative direction Z2, at an end closer to the first negative direction X2 than the center of the top plate 40 along the first axis X.

[0054] On the other hand, the second film thin portion 52B, like the first film thin portion 51B, is a portion of the surface of the roughened top plate 40 that does not have a thickness up to the peak TP. That is, although the second film thin portion 52B wets and extends on the surface of the roughened top plate 40 in the valley between the peaks TP, the peak TP of the top plate 40 is not covered. In addition, when viewed from the direction along the third axis Z, the second film thin portion 52B surrounds the second film thick portion 52A. Moreover, the end of the second film thin portion 52B in the first positive direction X1 does not reach the center of the top plate 40 in the direction along the first axis X. Therefore, the second film thin portion 52B does not contact the first film thin portion 51B. That is, the first range A11 and the third range A12 are separated. Furthermore, when the range in which the adhesive 50 exists on the surface of the top plate 40 is defined as the first existence range A1, the first existence range A1 is the range that combines the first range A11 and the third range A12.

[0055] like Figure 4 As shown, the surface of the second flange portion 13 facing the third positive direction Z1 is opposite to a portion of the second film thin portion 52B of the second adhesive portion 52. Furthermore, as... Figure 3 As shown, the second flange portion 13 is connected to the top plate 40 via a portion of the second film thickness portion 52A in the second adhesive portion 52. Therefore, as Figure 5 As shown, the area on the surface of the second flange portion 13 where the adhesive 50 exists, i.e., the fourth area A22, is smaller than the area in the second adhesive portion 52 where the second film thickness portion 52A exists. Therefore, the third area A12 is larger than the fourth area A22.

[0056] The combined range of the second range A21 and the fourth range A22 is defined as the second existence range A2. The first existence range A1 is larger than the second existence range A2. Specifically, the first existence range A1 is more than 1.1 times the size of the second existence range A2.

[0057] (Regarding cables)

[0058] Next, wire 30 will be described in detail.

[0059] like Figure 2 As shown, the first end of the wire 30 is connected to the surface of the first terminal electrode 21 facing the first negative direction X2. Furthermore, the first end of the wire 30 is located at the center of the first flange portion 12 along the second axis Y.

[0060] Furthermore, the second end of the wire 30 is connected to the surface of the second terminal electrode 22 facing the first positive direction X1. Additionally, the second end of the wire 30 is located at the center of the second flange portion 13 in the direction along the second axis Y.

[0061] The wire 30 has a first portion 30A including a first end, a second portion 30B including a second end, and a central portion 30C that is the portion between the first portion 30A and the second portion 30B.

[0062] The central portion 30C of the wire 30 extends spirally on the circumferential surface 11F of the core portion 11, with the central axis CA of the core portion 11 as the axis of rotation. On the other hand, the first portion 30A of the wire 30, including the first end, is separated from the circumferential surface 11F and extends spirally with the central axis CA as the axis of rotation. Similarly, the second portion 30B of the wire 30, including the second end, is separated from the circumferential surface 11F and extends spirally with the central axis CA as the axis of rotation.

[0063] Here, as Figure 8 As shown, the range of the wire 30 from the first part P1 connected to the first terminal electrode 21 to the part that is wound around the central axis CA, i.e., the second part P2, is defined as the first wire range WA1.

[0064] In most of the first wire range WA1, the wire 30 extends in an arc shape, centered on the central axis CA of the core portion 11, separated from the peripheral surface 11F of the core portion 11. Here, within the first wire range WA1, the area where the wire 30 is continuously separated from the peripheral surface 11F of the core portion 11 is defined as the first non-contact range SR1. One end of the first non-contact range SR1 is a first portion P1. The other end of the first non-contact range SR1 is the portion, i.e., the third portion P3, where the wire 30 begins to contact the peripheral surface 11F as it travels from the first end. That is, the first non-contact range SR1... Figure 8 The middle part is the area from the first part P1 of the wire 30 to the third part P3 in a clockwise direction. The third part P3 of the wire 30 is the fourth corner of the four corners of the core part 11 when the wire 30 starts to move from the first end.

[0065] Here, when viewed from the direction along the central axis CA, the straight line passing through the first part P1 and the central axis CA is designated as the first imaginary straight line VL1. Additionally, when viewed from the direction along the central axis CA, the straight line passing through the third part P3 and the central axis CA is designated as the second imaginary straight line VL2. At this time, the first angle C1, which forms the angle between the first imaginary straight line VL1 and the second imaginary straight line VL2 and points towards the first non-contact range SR1, is 180 degrees or more and less than 360 degrees. Therefore, the first non-contact range SR1 is wound within a range of 180 degrees or more and less than 360 degrees, and continuously separated from the circumferential surface 11F throughout this range.

[0066] Furthermore, when viewed from the direction along the central axis CA, the first non-contact range SR1 exists on the circumferential surface 11F, extending closer to the third positive direction Z1 than the central axis CA, i.e., the entire area closer to the top plate 40. Additionally, when viewed from the direction along the central axis CA, the first non-contact range SR1 is separated from approximately the entire area of ​​the circumferential surface 11F from the surface facing the second positive direction Y1 and the surface facing the second negative direction Y2.

[0067] Within the first non-contact range SR1, the wire 30 has a first connection portion CP1 that is connected to the top plate 40 via an adhesive 50. Specifically, the first connection portion CP1 of the wire 30 is connected to the top plate 40 via a first film thickness portion 51A of a first adhesive portion 51 in the adhesive 50. Therefore, at the first connection portion CP1, the wire 30 is separated from the peripheral surface 11F of the core portion 11.

[0068] Furthermore, the second portion 30B of wire 30 has a symmetrical structure to the first portion 30A of wire 30. For example... Figure 9 As shown, the range of the wire 30 from the fourth part P4 connected to the second terminal electrode 22 to the fifth part P5, which is the part that is wound around the central axis CA, is defined as the second wire range WA2.

[0069] For most of the second wire range WA2, the wire 30 extends in an arc shape, centered on the central axis CA of the core portion 11, separated from the peripheral surface 11F of the core portion 11. Here, within the second wire range WA2, the area where the wire 30 is continuously separated from the peripheral surface 11F of the core portion 11 is defined as the second non-contact range SR2. One end of the second non-contact range SR2 is the fourth portion P4. The other end of the second non-contact range SR2 is the sixth portion P6, which is the portion where the wire 30 begins to contact the peripheral surface 11F when it starts traveling from the second end. That is, the second non-contact range SR2... Figure 8The middle part is the area from the second end of the wire 30 to the sixth part P6, which is moved counterclockwise. The sixth part P6 of the wire 30 is the fourth corner of the four corners of the core part 11 when the wire 30 starts to move from the second end.

[0070] Here, when viewed from the direction along the central axis CA, the straight line passing through the fourth part P4 and the central axis CA is designated as the third imaginary straight line VL3. Additionally, when viewed from the direction along the central axis CA, the straight line passing through the sixth part P6 and the central axis CA is designated as the fourth imaginary straight line VL4. At this time, the second angle C2, which is the angle between the third imaginary straight line VL3 and the fourth imaginary straight line VL4 and points towards the second non-contact range SR2, is 180 degrees or more and less than 360 degrees. Therefore, the second non-contact range SR2 is wound within a range of 180 degrees or more and less than 360 degrees, and continuously separates from the circumferential surface 11F throughout this range.

[0071] Furthermore, when viewed from the direction along the central axis CA, the second non-contact range SR2 exists over the entire area of ​​the peripheral surface 11F that is closer to the third positive direction Z1 than the central axis CA, i.e., closer to the side of the top plate 40. Additionally, when viewed from the direction along the central axis CA, the second non-contact range SR2 is separated from approximately the entire area of ​​the peripheral surface 11F that faces the second positive direction Y1 and the second negative direction Y2.

[0072] Within the second non-contact range SR2, the wire 30 has a second connection portion CP2 that is connected to the top plate 40 via adhesive 50. Specifically, the second connection portion CP2 of the wire 30 is connected to the top plate 40 via a second film thickness portion 52A of the second adhesive portion 52 in the adhesive 50. Therefore, at the second connection portion CP2, the wire 30 is separated from the peripheral surface 11F of the core portion 11.

[0073] (The role of the implementation method)

[0074] The description of the first part 30A of wire 30 in the following functions and effects is the same as that in the description of the second part 30B of wire 30. Therefore, the description of the second part 30B of wire 30 is omitted.

[0075] As described above, in the first portion 30A of the wire 30, the first connecting portion CP1 is separated from the peripheral surface 11F of the core portion 11. Therefore, as Figure 3 As shown, the turns of the first part 30A and the turns of the central part 30C do not contact each other, creating a space between them.

[0076] (Effects of the implementation method)

[0077] (1) Suppose that if the turns of the first part 30A extend on the circumferential surface 11F of the core part 11, they will contact the turns of the central part 30C. In this case, when the turns are close to each other and in contact, a large parasitic capacitance is generated due to the small distance between the turns.

[0078] On the other hand, according to the above embodiment, the first connecting portion CP1 of the first part 30A of the wire 30 is separated from the peripheral surface 11F of the core portion 11. Therefore, as Figure 3 As shown, in the coil component 10, the turns of the first portion 30A do not contact the turns of the central portion 30C. This creates a space between the turns of the first portion 30A and the turns of the central portion 30C, thereby reducing the parasitic capacitance generated compared to the case where the turns are close to each other and in contact. Furthermore, reducing the parasitic capacitance generated in the wire 30 helps to suppress the decrease in impedance in the high-frequency band of the coil component 10.

[0079] (2) According to the above embodiment, the wire 30 is fixed to the top plate 40 by the adhesive 50. Therefore, it is easier to maintain the state in which the wire 30 is separated from the peripheral surface 11F of the core portion 11.

[0080] (3) According to the above embodiment, the first connection portion CP1 of the wire 30 is connected to the top plate 40 via adhesive 50. Therefore, the adhesive 50 used to connect the top plate 40 to the first flange portion 12 and the second flange portion 13 can also be used as a structure for connecting the wire 30 to the top plate 40. Therefore, it is not necessary to add special components for connecting the wire 30 to the top plate 40, or to use a special shape for the shape of the top plate 40.

[0081] (4) According to the above embodiment, the wire diameter WD is 5% or more and 20% or less relative to the core size CD. That is, the wire diameter WD is relatively large relative to the core size CD. Therefore, after applying tension to the wire 30 and winding it onto the circumferential surface 11F of the core portion 11, when pressing the first end of the wire 30 against the first terminal electrode 21, the tension is smaller than during winding, thereby making it easier to provide the first non-contact range SR1 within the first wire range WA1.

[0082] (5) According to the above embodiment, the first angle C1, which faces the first non-contact range SR1, is 180 degrees or more and less than 360 degrees in the angle formed by the first imaginary line VL1 and the second imaginary line VL2. Therefore, the first non-contact range SR1 is wound within a range of 180 degrees or more and less than 360 degrees. Therefore, the first non-contact range SR1 is correspondingly expanded to a wider range, thus further reducing the generated parasitic capacitance. The same applies to the second angle C2.

[0083] Furthermore, if the first non-contact range SR1 is more than 360 degrees, and the wire 30 is connected to the first connection point CP1 by multiple turns, there is a concern that if the coating of the wire 30 is damaged due to deterioration, there may be a possibility of current conduction between the multiple turns of the first connection point CP1 via the adhesive 50. In this embodiment, the first non-contact range SR1 is wound within a range of less than 360 degrees, thus avoiding such undesirable current conduction.

[0084] (6) According to the above embodiment, when viewed from the direction along the central axis CA, the wire 30 is separated from the surface facing the second positive direction Y1 and the surface facing the second negative direction Y2 in the first non-contact range SR1. Therefore, based on setting the first non-contact range SR1 as a range of more than 180 degrees continuously, it is easy to set this range to include the first connection portion CP1.

[0085] (7) According to the above embodiment, in the second portion 30B of the wire 30, a second connection portion CP2 is present in the same manner as the first connection portion CP1 in the first wire range WA1 of the first portion 30A. Therefore, in addition to the first portion 30A containing the first end of the wire 30, the parasitic capacitance generated in the second portion 30B containing the second end of the wire 30 is also reduced.

[0086] (8) The first extent A1 of adhesive 50 is larger than the second extent A2, which combines the extent of adhesive 50 on the surface of the first flange 12 with the extent of adhesive 50 on the surface of the second flange 13. Therefore, the adhesive 50 extends on the surface of the top plate 40 beyond the range required for fixing the first flange 12 and the second flange 13 to the top plate 40. This larger extent of adhesive 50 on the surface of the top plate 40 allows it to easily withstand loads relative to the top plate 40 along the third axis Z, corresponding to the amount of adhesive 50 present. As a result, even when a load is applied to the top plate 40, breakage can be suppressed.

[0087] Furthermore, the adhesive 50 does not contact the core portion 11. If the adhesive 50 were to reach the core portion 11, there would be a concern that a large portion of the wire 30 would be in contact with the adhesive 50, potentially leading to deterioration of the coating on the wire 30. Therefore, short circuits between adjacent wires due to such deterioration can be avoided. Additionally, the amount of adhesive 50 is not excessive compared to the minimum amount required to bond the first flange portion 12 and the second flange portion 13 to the top plate 40.

[0088] (9) According to the above embodiment, when viewed from the direction along the third axis Z, the surface of the core portion 11 opposite to the top plate 40 overlaps with a portion of the first range A11 and a portion of the third range A12. That is, a portion of the first range A1 is opposite to the core portion 11. The core portion 11 is located at the center of the coil member 10 in the direction along the second axis Y. Therefore, by reinforcing the top plate 40 with the adhesive 50, the top plate 40 can withstand the load even when a load is applied to the top plate 40 when the coil member 10 is mounted on the substrate.

[0089] (10) According to the above embodiment, the size of the first existence range A1 is 1.1 times or more the size of the second existence range A2. If it is 1.1 times or more, then the area of ​​the first existence range A1 is sufficient to strengthen the area of ​​the top plate 40.

[0090] (11) According to the above embodiment, the unfolded area ratio Sdr of the surface of the top plate 40 is 0.15 or more and 0.50 or less. Therefore, when the adhesive 50 is applied to the surface of the top plate 40, the adhesive 50 can easily wet and spread between the fine protrusions and depressions of the top plate 40. Therefore, even without using a special method as the application method of the adhesive 50, it is possible to apply the adhesive 50 to a large area of ​​the surface of the top plate 40.

[0091] (12) According to the above embodiment, the unfolded area ratio Sdr of the surface of the top plate 40 is larger than the unfolded area ratio Sdr of the surfaces of the first flange portion 12 and the second flange portion 13. Therefore, the adhesive 50 is more easily wetted and spread on the surface of the top plate 40 than on the surfaces of the first flange portion 12 and the second flange portion 13. As a result, the range of wetting and spreading of the adhesive 50 on the surface of the top plate 40 is larger than the range of wetting and spreading of the adhesive 50 on the surfaces of the first flange portion 12 and the second flange portion 13.

[0092] <Other Implementation Methods>

[0093] The above-described embodiments can be modified as follows. The above-described embodiments and the following modifications can be combined and implemented within the scope of technical non-contradiction. In addition, the modification of the ratio of the coil component 10 to the center of the direction along the first axis X, which is closer to the first positive direction X1, can also be applied to the ratio of the coil component to the center of the direction along the first axis X, which is closer to the first negative direction X2.

[0094] • In the above embodiments, the shape of the core portion 11 is not limited to the examples of the above embodiments. For example, it may be cylindrical or a polygonal prism other than a tetrahedral prism.

[0095] In the above embodiment, multiple wires 30 may be wound around the core portion 11. Furthermore, the number of terminal electrodes can be appropriately adjusted to match the number of wires 30. Additionally, when multiple wires 30 are present, it is sufficient that at least one wire 30's first portion 30A has a first connection portion CP1.

[0096] In the above embodiments, the wire diameter WD can be less than 5% or greater than 20% relative to the core size CD. The core size CD and the wire diameter WD can be appropriately adjusted along with the necessary characteristics.

[0097] In the above embodiment, the central portion 30C of the wire 30 extends in a spiral shape while always in contact with the peripheral surface 11F of the core portion 11. However, there are also cases where the wire 30 extends in a spiral shape but is partially separated from the peripheral surface 11F. For example, the wire 30 may only be in contact with the vicinity of the four corners when viewed from the direction along the central axis CA. In this way, even if the wire 30 is in intermittent contact with the peripheral surface 11F, it can be said that the wire 30 extends on the peripheral surface 11F.

[0098] In the above embodiment, the size of the first angle C1 can also be less than 180 degrees. That is, the first non-contact range SR1 can also be less than 180 degrees. This is as long as at least the first connection portion CP1 is included within the first non-contact range SR1. Furthermore, as long as a portion of the first non-contact range SR1 is included within the first wire range WA1, a portion of the first non-contact range SR1 can also exist outside the first wire range WA1. The same applies to the second angle C2 and the second non-contact range SR2.

[0099] In the above embodiment, the first portion 30A of the wire 30 may also be separated only relative to the surface of the peripheral surface 11F facing the third positive direction Z1. That is, the first portion 30A may also be in contact with the surface of the peripheral surface 11F facing the third negative direction Z2.

[0100] In the above embodiment, as long as at least the first connection portion CP1 is connected to the top plate 40 and separated from the peripheral surface 11F, the second connection portion CP2 can be omitted. In this case, the parasitic capacitance at the first connection portion CP1 can also be reduced.

[0101] • In the above embodiments, the shape of the top plate 40 is not limited to the examples of the above embodiments. As long as it is at least mounted on the first flange portion 12 and the second flange portion 13, for example, a protrusion may be provided on the surface of the top plate 40 in the third negative direction Z2.

[0102] • In the above embodiment, the first existence range A1 may not exist in the portion opposite to the core portion 11. For example, the first range A11 may exist only in the portion opposite to the first flange portion 12, and the second range A21 may exist only in a portion of the surface of the first flange portion 12 facing the third positive direction Z1.

[0103] In the above embodiment, the first range A11 and the third range A12 are separate, but they can also be in contact, forming a first existing range A1. Alternatively, the first existing range A1 can also be composed of three or more ranges.

[0104] In the above embodiment, the adhesive 50 may also consist entirely of the film thickness portion. For example, the entire film thickness portion may be formed by applying a corresponding amount of adhesive 50 to the entire surface of the top plate 40 facing the third negative direction Z2.

[0105] In the above embodiments, the unfolded area ratio Sdr of the top plate 40 and the unfolded area ratio Sdr of the core 10C are not limited to the examples of the above embodiments. The unfolded area ratio Sdr of the top plate 40 may be less than 0.15 or greater than 0.50. In addition, the unfolded area ratio Sdr of the top plate 40 may be less than or equal to the unfolded area ratio Sdr of the core 10C. In this case, in order to widely wet and spread the adhesive 50 on the surface of the top plate 40 facing the third negative direction Z2, it is sufficient to first apply the adhesive 50 to the top plate 40. Alternatively, after placing the adhesive 50 on the top plate 40, the adhesive 50 may be applied using a jig or by spin coating or other methods.

[0106] In the above embodiment, the size of the first existence range A1 may also be less than 1.1 times the size of the second existence range A2. During the coating process, as long as deviation is unlikely to occur within the coating range of the adhesive 50, it is highly probable that the size of the first existence range A1 is greater than the size of the second existence range A2, even if the size of the first existence range A1 is less than 1.1 times the size of the second existence range A2.

[0107] In the above embodiment, the adhesive 50 is a thermosetting adhesive 50, but the type of adhesive 50 can be appropriately changed. The adhesive 50 may also be composed solely of resin, or an inorganic filler such as a silica filler may be added to the resin. Furthermore, when the adhesive 50 contains an inorganic filler, the inorganic filler is likely to exist only in the film thickness portion.

[0108] In the above embodiment, the size of the first existence range A1 may be smaller than or equal to the size of the second existence range A2. In this case, the first connection portion CP1 may also be connected to the top plate 40 via an adhesive different from the adhesive 50 that connects the core 10C and the top plate 40.

[0109] In the above embodiment, the adhesive 50 can also be omitted, and the core 10C and the top plate 40 can be integrated. In this case, such as Figure 10 As with the coil component 110 in the modified example shown, the first contact portion CP11 can also directly contact the top plate 40 without the aid of other components. For example, before the top plate 40 is connected to the core 10C, when the wire 30 is wound so that when viewed from the end of the first flange portion 12 in the third positive direction Z1, the first portion 30A of the wire 30 protrudes towards the third positive direction Z1. In this state, the top plate 40 is connected to the core 10C by pressing the first portion 30A with the top plate 40. Thus, the first portion 30A is pressed against the top plate 40 by its own elasticity. As a result, the first portion 30A has the first contact portion CP11 that is directly connected to the top plate 40. Therefore, the coil component 110 does not have the first connection portion CP1, but has the first contact portion CP11. Moreover, at the first contact portion CP11, the wire 30 separates from the peripheral surface 11F of the core portion 11. Similarly, the coil component 10 does not have the second connection portion CP2, but has the second contact portion CP12. Furthermore, at the second contact point CP12, the wire 30 separates from the peripheral surface 11F of the core portion 11.

[0110] According to this structure, at the first contact point CP11, the wire 30 is separated from the peripheral surface 11F of the core portion 11. Therefore, in the coil component 10, the turns of the first portion 30A do not contact the turns of the central portion 30C. This creates a space between the turns of the first portion 30A and the turns of the central portion 30C, thereby reducing the parasitic capacitance generated compared to the case where the turns are close to each other and in contact. Furthermore, reducing the parasitic capacitance generated in the wire 30 helps to suppress the decrease in impedance in the high-frequency band of the coil component 10.

[0111] In the above embodiment, the first portion 30A of the wire 30 may also not have the first connection portion CP1. Furthermore, if the first portion 30A does not have the first connection portion CP1, such as... Figure 11 As with the coil component 210 shown, the top plate 40 can also be omitted. In these modified examples, when viewed from the direction along the central axis CA, the first non-contact range SR1 only needs to exist in the entire range on the side of the third positive direction Z1, which is closer to the central axis CA.

Claims

1. A coil component, wherein, have: The core has a core portion, a first flange portion, and a second flange portion. The core portion has a central axis. The first flange portion is connected to a first end of the core portion along the central axis and protrudes from the circumference of the core portion radially outward about the central axis. The second flange portion is connected to a second end of the core portion on the opposite side of the first end and protrudes from the circumference of the core portion radially outward about the central axis. The wire has a portion that extends in a spiral shape on the circumferential surface of the core portion about the central axis as the axis of rotation; The first terminal electrode is connected to the first end of the wire and is disposed on the surface of the first flange portion; The second terminal electrode is connected to the second end of the wire and is disposed on the surface of the second flange portion; as well as The top plate extends longer than the core in the direction along the central axis and connects to the first flange and the second flange. When an axis orthogonal to the central axis is defined as the orthogonal axis, one of the two directions along the orthogonal axis is defined as the positive direction, and the opposite direction of the positive direction is defined as the negative direction, The top plate is connected to the positive end of the first flange portion and the positive end of the second flange portion. The first terminal electrode is located at the negative direction end of the surface of the first flange portion. When the first wire range is defined as the area from the part connected to the first terminal electrode to the part that is wound around the central axis, The wire has a connection portion within the range of the first wire that connects to the top plate. At the connection point, the wire separates from the circumferential surface of the core portion.

2. The coil component according to claim 1, wherein, The coil component has an adhesive for bonding the top plate to the first flange and the second flange. The adhesive is applied to the surfaces of the top plate opposite the first flange and the second flange. The connection portion is connected to the top plate via the adhesive.

3. The coil component according to claim 1 or 2, wherein, The core size is defined as the dimension extending from the end of the core portion along the positive direction of the orthogonal axis to the end of the first flange portion along the negative direction of the orthogonal axis. And when the diameter of the wire is set as the wire diameter, The diameter of the wire is more than 5% and less than 20% of the core size.

4. The coil component according to claim 1 or 2, wherein, When the area separated from the circumferential surface of the core portion within the first wire range is defined as a non-contact range,... When viewed from a direction along the central axis, the angle of the line passing through the first end of the non-contact range in the extension direction of the wire and the central axis, and the angle of the line passing through the second end of the non-contact range opposite to the first end in the extension direction of the wire and the central axis, toward the non-contact range, is 180 degrees or more.

5. The coil component according to claim 1 or 2, wherein, The second terminal electrode is located at the negative direction end of the surface of the second flange. The second wire range is defined as the area from the part of the wire connected to the second terminal electrode to the part that is wound around the central axis once. And when the connecting part is set as the first connecting part. The wire has a second connection portion within the range of the second wire that connects to the top plate. At the second connection point, the wire separates from the circumferential surface of the core portion.

6. A coil component, wherein, have: The core has a core portion, a first flange portion, and a second flange portion. The core portion has a central axis. The first flange portion is connected to a first end of the core portion along the central axis and protrudes from the circumference of the core portion radially outward about the central axis. The second flange portion is connected to a second end of the core portion on the opposite side of the first end and protrudes from the circumference of the core portion radially outward about the central axis. The wire has a portion that extends in a spiral shape on the circumferential surface of the core portion about the central axis as the axis of rotation; The first terminal electrode is connected to the first end of the wire and is disposed on the surface of the first flange portion; The second terminal electrode is connected to the second end of the wire and is disposed on the surface of the second flange portion; as well as The top plate extends longer than the core in the direction along the central axis and connects to the first flange and the second flange. When an axis orthogonal to the central axis is defined as the orthogonal axis, one of the two directions along the orthogonal axis is defined as the positive direction, and the opposite direction of the positive direction is defined as the negative direction, The top plate is connected to the positive end of the first flange portion and the positive end of the second flange portion. The first terminal electrode is located at the negative direction end of the surface of the first flange portion. When the first wire range is defined as the area from the part connected to the first terminal electrode to the part that is wound around the central axis, The wire has a contact portion that contacts the top plate within the range of the first wire. At the contact point, the wire separates from the circumferential surface of the core portion.

7. A coil component, wherein, have: The core has a core portion, a first flange portion, and a second flange portion. The core portion has a central axis. The first flange portion is connected to a first end of the core portion along the central axis and protrudes from the circumference of the core portion radially outward about the central axis. The second flange portion is connected to a second end of the core portion on the opposite side of the first end and protrudes from the circumference of the core portion radially outward about the central axis. The wire has a portion that extends in a spiral shape on the circumferential surface of the core portion about the central axis as the axis of rotation; The first terminal electrode is connected to the first end of the wire and is disposed on the surface of the first flange portion; as well as The second terminal electrode, connected to the second end of the wire, is disposed on the surface of the second flange portion. When an axis orthogonal to the central axis is defined as the orthogonal axis, one of the two directions along the orthogonal axis is defined as the positive direction, and the opposite direction of the positive direction is defined as the negative direction, The first terminal electrode is located at the negative direction end of the surface of the first flange portion. When the first wire range is defined as the area from the part connected to the first terminal electrode to the part that is wound around the central axis, When viewed from the central axis, the wire is separated from the core portion over the entire positive direction side of the first wire range.

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