Coil component

Abstract

This invention relates to coil components. The invention provides a coil component capable of ensuring mode-switching characteristics and improving inductance. The coil component comprises: a core having a wound core portion; and a coil wound along the axis of the wound core portion, including a plurality of wires, the coil having a winding region wound around the wound core portion, the winding region having a stranded portion formed by twisting the plurality of wires together, and a parallel portion in which the plurality of wires are not twisted together and run parallel to each other.

Description

Technical Field

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

[0002] Conventionally, a coil component described in Japanese Patent Application Publication No. 2017-188568 (Patent Document 1) exists. This coil component comprises: a core having a winding core portion; and a coil wound around the winding core portion, including multiple wires. The coil has a stranded portion formed by twisting multiple wires together, the stranded portion forming a first layer consisting of multiple turns continuously wound around the winding core portion, and a second layer consisting of multiple turns continuously wound around the first layer starting from the first layer.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2017-188568

[0004] However, while good mode-changing characteristics can be ensured in the aforementioned conventional coil components, the stranded portion is wound around the core, which easily creates unwanted space between the stranded portions of adjacent turns. Furthermore, the stranded portion is prone to wire expansion during winding, further increasing unwanted space between adjacent turns. This makes it difficult to tightly wind the stranded portion around the core, hindering the increase in the number of coil turns and thus making it difficult to obtain a high inductance value. In particular, if the stranded portion is formed in a double layer, the unwanted space further increases, making it difficult to increase the number of coil turns and thus difficult to obtain a high inductance value. Summary of the Invention

[0005] Therefore, this disclosure provides a coil component that can ensure mode switching characteristics and improve inductance value.

[0006] To solve the above-mentioned problems, one embodiment of the coil component disclosed herein includes:

[0007] Core, having a winding core section; and

[0008] The coil, wound along the axis of the aforementioned core portion, comprises multiple wires.

[0009] The coil described above has a winding area wound around the core portion.

[0010] The winding area has a stranded section formed by twisting the aforementioned multiple wires together, and a parallel section in which the aforementioned multiple wires are not twisted together and run parallel to each other.

[0011] As described above, the winding area has a parallel section, which allows the wire to be tightly wound around the core section. This increases the number of turns of the coil relative to the core section, thereby improving the inductance. Furthermore, the winding area has a stranded section, ensuring mode-switching characteristics.

[0012] Preferably, in one embodiment of the coil component, the twisted wire portion has a twist of 1 or more when the core portion is continuously wound at least 1 turn and the core portion is continuously wound at least 1 turn.

[0013] Here, a twist of 1 refers to the state from a specific relative position of multiple twisted wires until they return to the same initial relative position the next time they are twisted together. That is, a twist of 1 means the state when the positional relationship of multiple twisted wires is rotated from 0° to 360°.

[0014] According to the above embodiment, compared with the case where the twisted section is continuously wound 1 / 2 turns in the core section, or the case where the twisted section has 1 / 2 turns in the state of continuous winding of the core section, the mode switching characteristics can be improved.

[0015] Preferably, in one embodiment of the coil component, the parallel portion is continuously wound at least one turn in the core portion.

[0016] According to the above embodiment, compared with the case where the parallel section is continuously wound 1 / 2 turns in the core section, the number of turns of the coil can be further increased relative to the core section, thereby further improving the inductance value.

[0017] Preferably, in one embodiment of the coil component, the twist number of the stranded portion, as the coil as a whole, is a natural number.

[0018] According to the above embodiment, the twist rate of the stranded section is a natural number, thus allowing the multiple wires of the stranded section to be symmetrically arranged as a whole coil. This enables more thorough cancellation of the capacitive component of the stranded section, thereby improving mode switching characteristics.

[0019] Preferably, in one embodiment of the coil component,

[0020] The core includes a first flange portion disposed at a first end of the core portion and a second flange portion disposed at a second end of the core portion.

[0021] The coil component further includes a plurality of electrode portions disposed on the first flange portion and connected to the coil, and a plurality of electrode portions disposed on the second flange portion and connected to the coil.

[0022] In the aforementioned winding region, at least a portion of the stranded portion is located at the position closest to at least one of the first end and the second end of the aforementioned core portion.

[0023] According to the above embodiment, at least a portion of the stranded wire portion is located at a position closest to at least one of the first end and the second end, thus reducing the capacitance difference between the first wire and the second wire in the portion close to the electrode portion. This reduces stray capacitance between the stranded wire portion and the electrode portion, thereby improving mode switching characteristics.

[0024] Preferably, in one embodiment of the coil component,

[0025] The core includes a first flange portion disposed at a first end of the core portion and a second flange portion disposed at a second end of the core portion.

[0026] The coil component further includes a plurality of electrode portions disposed on the first flange portion and connected to the coil, and a plurality of electrode portions disposed on the second flange portion and connected to the coil.

[0027] In the aforementioned winding region, at least a portion of the aforementioned parallel portion exists at a position closest to at least one of the aforementioned first end and the aforementioned second end in the aforementioned core portion.

[0028] According to the above embodiment, at least a portion of the parallel section exists at a position closest to at least one of the first end and the second end. Therefore, in the section from the end of the core section where the parallel section exists to the electrode section, multiple wires can be formed in a state where they are not twisted together. As a result, the length of the wire drawn from the end of the core section to the electrode section can be kept constant for each product, thereby suppressing the differences in characteristics of each product.

[0029] In addition, the winding expansion of the wire caused by twisting multiple wires can be suppressed in the section from the end of the core to the electrode, thereby reducing the contact between the solder and the wire led from the end of the core to the electrode when the coil component is mounted on the mounting substrate.

[0030] Furthermore, multiple wires can be left untwisted from the end of the core to the electrode section, and then twisted together after being wound around the end of the core. This allows for a stable starting position of the twisting of the multiple wires.

[0031] Preferably, in one embodiment of the coil component,

[0032] The core includes a first flange portion disposed at a first end of the core portion and a second flange portion disposed at a second end of the core portion.

[0033] The coil component further includes a plurality of electrode portions disposed on the first flange portion and connected to the coil, and a plurality of electrode portions disposed on the second flange portion and connected to the coil.

[0034] In the aforementioned winding region, the aforementioned stranded portion and the aforementioned parallel portion are arranged alternately along the aforementioned axis.

[0035] According to the above embodiment, the stranded section and the parallel section are arranged alternately along the axis, so that the wire capacitance of each turn can be more uniform, thereby further improving the mode switching characteristics. In addition, the wire can be wound more tightly in the core section, thereby further improving the inductance value.

[0036] Preferably, in one embodiment of the coil component, the aforementioned parallel portion includes a first wire and a second wire that are parallel to each other without being twisted.

[0037] In the aforementioned winding region, at least a portion of the parallel portion, one of the first wire and the second wire forming the same turn, forms a first layer wound on the aforementioned core portion, and the other of the first wire and the second wire forming the same turn forms a second layer wound on the aforementioned first layer.

[0038] According to the above embodiment, at least a portion of the parallel section consists of a first wire and a second wire forming the same turn, which form a double layer, thereby increasing the number of turns of the coil and further improving the inductance value.

[0039] Preferably, in one embodiment of the coil component, in the winding region, the stranded portion constitutes a first layer in which the core portion is continuously wound multiple turns, and a second layer in which the first layer is continuously wound multiple turns.

[0040] According to the above embodiment, the stranded section has a double-layer structure, which can increase the number of turns of the coil, thereby further improving the inductance value.

[0041] Preferably, in one embodiment of the coil component, in the winding region, either the stranded portion or the parallel portion constitutes a first layer that is continuously wound multiple turns on the core portion, and the other stranded portion or the parallel portion constitutes a second layer that is continuously wound multiple turns on the first layer.

[0042] According to the above embodiment, the stranded section and the parallel section form a double-layer structure, thus increasing the number of turns of the coil and further improving the inductance value. Furthermore, increasing the stranded section and the parallel section increases the number of turns of the coil and further improves the mode switching characteristics.

[0043] Preferably, in one embodiment of the coil component,

[0044] The core includes a first flange portion disposed at a first end of the core portion and a second flange portion disposed at a second end of the core portion.

[0045] The coil component further includes a first electrode portion and a second electrode portion disposed on the first flange portion, and a third electrode portion and a fourth electrode portion disposed on the second flange portion.

[0046] The coil includes a first wire electrically connected to the first electrode portion and the third electrode portion, and a second wire electrically connected to the second electrode portion and the fourth electrode portion.

[0047] When viewed from the aforementioned axial direction, the first electrode portion and the second electrode portion are symmetrically arranged with respect to the central position of the left and right widths of the first flange portion. The first wire and the second wire are led out from the central position of the left and right widths of the first flange portion in the winding core portion toward the first electrode portion and the second electrode portion, respectively.

[0048] When viewed from the axial direction, the third electrode portion and the fourth electrode portion are symmetrically arranged with respect to the central position of the left and right width of the second flange portion, and the first wire and the second wire are led out from the central position of the left and right width of the second flange portion in the core portion toward the third electrode portion and the fourth electrode portion.

[0049] According to the above embodiment, the length from the core portion of the first wire to the first electrode portion can be made the same as the length from the core portion of the second wire to the second electrode portion. In addition, the length from the core portion of the first wire to the third electrode portion can be made the same as the length from the core portion of the second wire to the fourth electrode portion, thereby further improving the mode switching characteristics.

[0050] According to one embodiment of the present disclosure, the coil component can ensure mode switching characteristics and improve inductance value. Attached Figure Description

[0051] Figure 1 This is a perspective view showing the first embodiment of the coil component as viewed from the lower surface side.

[0052] Figure 2A This is an enlarged view of the Z-twisted strand section.

[0053] Figure 2B This is an enlarged view of the S-shaped twisted strand.

[0054] Figure 3 This is an explanatory diagram illustrating the cross-section at a specified location of the stranded wire.

[0055] Figure 4 This is a schematic cross-sectional view of the coil component.

[0056] Figure 5 This is a schematic cross-sectional view showing a second embodiment of the coil component.

[0057] Figure 6 This is a schematic cross-sectional view showing a third embodiment of the coil component.

[0058] Figure 7A This is a schematic cross-sectional view showing the fourth embodiment of the coil component.

[0059] Figure 7B This is a schematic cross-sectional view showing a first modified example of the coil component.

[0060] Figure 7C This is a schematic cross-sectional view showing a second modified example of the coil component.

[0061] Figure 8 This is an end view of the fifth embodiment of the coil component as viewed from the outer surface side of the first flange.

[0062] Explanation of reference numerals in the attached figures:

[0063] 1, 1A, 1B, 1C, 1D, 1E, 1F…coil components; 10…core; 11, 11E…first flange; 12…second flange; 13…core; 13a…shaft; 131…first end; 132…second end; 15…plate components; 20, 20A, 20B, 20C, 20D, 20F…coils; 21…first wire; 22…second wire; 25…stranded section; 26…parallel section; 31…first electrode section; 32…second electrode section; 33…third electrode section; 34…fourth electrode section; 110…slot section; C…central position; W…left and right width; L1…first layer; L2…second layer; Z1…winding area; Z2…non-winding area. Detailed Implementation

[0064] Hereinafter, a coil component as one embodiment of the present disclosure will be described in detail with reference to the illustrated embodiments. Furthermore, the drawings include partial schematic diagrams and may not always reflect actual dimensions or proportions.

[0065] (First Implementation)

[0066] Figure 1 This is a perspective view showing the first embodiment of the coil component as viewed from the lower surface side. (See diagram below.) Figure 1 As shown, the coil component 1 includes: a core 10; a coil 20 wound around the core 10; a first electrode portion 31, a second electrode portion 32, a third electrode portion 33, and a fourth electrode portion 34 serving as external terminals, which are disposed on the core 10 and electrically connected to the coil 20; and a plate component 15 mounted on the core 10. Furthermore, in Figure 1 For ease of explanation, a portion of coil 20 is shown in the simplified version.

[0067] The core 10 includes: a core portion 13, which is shaped to extend in a certain direction and is wound around a coil 20; a first flange portion 11, which is provided at a first end in the direction in which the core portion 13 extends and extends in a direction orthogonal to that direction; and a second flange portion 12, which is provided at a second end in the direction in which the core portion 13 extends and extends in a direction orthogonal to that direction. The material of the core 10 is preferably a sintered ferrite body, a molded body containing magnetic powder resin, or a non-magnetic body such as alumina or resin. The cross-section of the core portion 13, which is orthogonal to the direction in which the core portion 13 extends, can be quadrilateral, other polygonal, circular, elliptical, or a shape formed by appropriate combinations of these shapes. Furthermore, the lower surface of the core 10 will be used as the surface on which it is mounted to the mounting substrate, and the surface opposite to the lower surface will be used as the upper surface of the core 10.

[0068] The first flange portion 11 has: an inner surface 111 facing the core portion 13; an outer surface 112 facing the opposite side to the inner surface 111; a lower surface 113 connecting the inner surface 111 and the outer surface 112; an upper surface 114 facing the opposite side to the lower surface 113; and two side surfaces 115 connecting the inner surface 111 and the outer surface 112 and connecting the lower surface 113 and the upper surface 114.

[0069] Similarly, the second flange portion 12 has: an inner surface 121 facing the core portion 13; an outer surface 122 facing the opposite side to the inner surface 121; a lower surface 123; an upper surface 124; and two side surfaces 125. The lower surface 123, upper surface 124, and side surfaces 125 of the second flange portion 12 face the same direction as the lower surface 113, upper surface 114, and side surface 115 of the first flange portion 11. Furthermore, "lower surface" and "upper surface" are descriptive terms and may not actually correspond to "below" and "above" in the vertical direction.

[0070] The plate component 15 is attached to the upper surface 114 of the first flange 11 and the upper surface 124 of the second flange 12 using an adhesive. The material of the plate component 15 is, for example, the same as that of the core 10. When both the core 10 and the plate component 15 are magnetic materials, they form a closed magnetic circuit, thereby improving the efficiency of inductance. The plate component 15 has, for example, a length of approximately 3.2 mm, a width of approximately 2.5 mm, and a thickness of approximately 0.7 mm.

[0071] The first flange portion 11 has two feet on the lower surface 113 side, with a first electrode portion 31 disposed on one foot and a second electrode portion 32 disposed on the other foot. The first electrode portion 31 and the second electrode portion 32 are continuously disposed on the outer surface 112 and the lower surface 113, respectively. The portions of the first electrode portion 31 and the second electrode portion 32 disposed on the outer surface 112 include, for example, a NiCr layer, a NiCu layer, a Cu layer, a Ni layer, and a Sn layer. The portions of the first electrode portion 31 and the second electrode portion 32 disposed on the lower surface 113 include, for example, an Ag layer, a Cu layer, a Ni layer, and a Sn layer.

[0072] The second flange portion 12 has two feet on the lower surface 123 side. A third electrode portion 33 is provided on one foot located on the same side as the foot where the first electrode portion 31 is provided, and a fourth electrode portion 34 is provided on the other foot located on the same side as the foot where the second electrode portion 32 is provided. The third electrode portion 33 and the fourth electrode portion 34 are respectively continuously provided on the outer surface 122 and the lower surface 123.

[0073] like Figure 1 As shown, the lower surface 113 of the first flange portion 11 and the lower surface 123 of the second flange portion 12 refer to the portion that extends from the lower surface portion of the foot through the inclined portion of the hip between the feet and includes the lower surface portion of the hip. Furthermore, in the following description, when the first electrode portion 31, the second electrode portion 32, the third electrode portion 33, and the fourth electrode portion 34 are described together, they are sometimes referred to as electrode portions 31 to 34.

[0074] The coil 20 has a wound region Z1 wound around the core portion 13 and a non-wound region Z2 not wound around the core portion 13. More specifically, the non-wound region Z2 is located on both sides of the wound region Z1, separated from the core portion 13 and connected to the electrode portions 31 to 34.

[0075] The coil 20 includes a first wire 21 and a second wire 22 wound along the axis of the core portion 13. That is, the coil axis of the coil 20 is aligned with the direction in which the core portion 13 extends (the axis of the core portion 13). The first wire 21 and the second wire 22 are conductors made of metals such as copper (e.g., conductor diameter: φ0.020mm to φ0.080mm) covered with an insulating film made of resins such as polyurethane, imide-modified polyurethane, polyesterimide, and polyamideimide.

[0076] The first end of the first wire 21 is electrically connected to the first electrode portion 31, and the second end of the first wire 21 is electrically connected to the third electrode portion 33. The first end of the second wire 22 is electrically connected to the second electrode portion 32, and the second end of the second wire 22 is electrically connected to the fourth electrode portion 34. The first wire 21 and the second wire 22 are connected to the electrode portions 31 to 34, for example, by heat pressing, brazing, welding, etc.

[0077] The first wire 21 and the second wire 22 are wound in the same direction on the core portion 13. Therefore, in the coil component 1, if a differential signal or other signal of opposite phase is input to the first wire 21 and the second wire 22, the magnetic flux generated by the first wire 21 and the second wire 22 cancels each other out, weakening the inductor effect and allowing the signal to pass through. On the other hand, if an external noise or other signal of the same phase is input to the first wire 21 and the second wire 22, the magnetic flux generated by the first wire 21 and the second wire 22 reinforces each other, strengthening the inductor effect and blocking the noise from passing through. Therefore, the coil component 1 functions as a common-mode choke coil that reduces the transmission loss of differential-mode signals such as differential signals and attenuates common-mode signals such as external noise.

[0078] When the coil component 1 is mounted on the mounting substrate, the lower surface 113 of the first flange portion 11 and the lower surface 123 of the second flange portion 12 face the mounting substrate. At this time, the direction in which the core portion 13 extends from the first end to the second end (the axis of the core portion 13) is parallel to the main surface of the mounting substrate. That is, the coil component 1 is a horizontally wound type in which the coil axes of the first wire 21 and the second wire 22 are parallel to the mounting substrate.

[0079] The coil 20 has a stranded section 25 formed by twisting a first wire 21 and a second wire 22 together. Figure 2A and Figure 2B This is an enlarged view of the stranded section 25. Figure 2A and Figure 2B For ease of explanation, a diagonal line is applied to the second wire 22. Figure 2A This indicates the Z-twisted strand portion 25a. Figure 2B This refers to the S-shaped twisted strand section 25b. The twisting direction of the Z-shaped twisted strand section 25a is opposite to that of the S-shaped twisted strand section 25b. The twisting direction refers to the rotation direction of the first wire 21 and the second wire 22 that are twisted together.

[0080] like Figure 2A and Figure 2BAs shown, the stranded section 25 is formed by twisting the first wire 21 and the second wire 22 together. In the stranded section 25, the relative differences between the two wires (such as line length and stray capacitance deviation) are reduced, thus reducing the mode conversion output, such as the differential mode signal being converted into a common mode signal and output or vice versa, within the coil component 1, thereby improving the mode conversion characteristics.

[0081] In addition, Figure 2A and Figure 2B In the stranded section 25, the first wire 21 and the second wire 22 are twisted together in close contact, but there may also be sections that are spaced apart from each other, or they may be twisted together as a whole. In addition, in the coil 20, the twisting direction of the stranded section 25 can be Z-shaped twisting, S-shaped twisting, or a combination of Z-shaped twisting and S-shaped twisting as described later.

[0082] like Figure 2A and Figure 2B As shown, the twist pitch P of the stranded section 25 refers to the length from a specific relative position of the first wire 21 and the second wire 22 until they return to the same initial relative position when the first wire 21 and the second wire 22 are twisted together. In other words, the twist pitch P of the stranded section 25 refers to the length when the positional relationship of the multiple twisted wires is rotated from 0° to 360°.

[0083] Furthermore, in the twist count of the stranded section 25, the twist count when the positional relationship between the first twisted wire 21 and the second twisted wire 22 is rotated 360° is set to 1. For example, in the two wires 21 and 22, the twist count when the positional relationship of the wires is rotated 180°, that is, when the two wires 21 and 22 are exactly switched, is set to 1 / 2, and the twist count when the positional relationship of the wires is rotated another 180°, that is, when the positional relationship of the two wires 21 and 22 returns to the initial position, is set to 1.

[0084] Figure 3 This is an explanatory diagram illustrating the cross-section at a specified location of the stranded section 25. (For example...) Figure 3 As shown, the twist from the position of section A-A to the position of section B-B is 1 / 4, the twist from the position of section A-A to the position of section C-C is 1 / 2, the twist from the position of section A-A to the position of section D-D is 3 / 4, and the twist from the position of section A-A to the position of section E-E is 1.

[0085] The construction of the first wire 21 and the second wire 22 of the stranded section 25 at the A-A section is symmetrical to that at the C-C section, thus canceling out the capacitance between the wires. Similarly, the construction of the first wire 21 and the second wire 22 of the stranded section 25 at the B-B section is symmetrical to that at the D-D section, thus canceling out the capacitance between the wires. In this way, when the twist rate of the stranded section 25 is 1, the first wire 21 and the second wire 22 are symmetrically arranged, and the capacitance between the symmetrical wires cancels out, thereby improving mode switching characteristics.

[0086] Figure 4 This is a schematic cross-sectional view of coil component 1. Figure 4 This is a diagram showing a portion of a cross-section, including the shaft 13a of the core portion 13. Figure 4 In this embodiment, the number of turns is indicated by a number, starting from the first end 131 of the core portion 13 of the coil 20. The number of turns is not a sequential numbering starting from the turn closest to the first flange portion 11, but rather a number indicating the winding sequence of the coil 20. In this embodiment, the coil 20 is wound 6 turns from the first end 131 of the core portion 13 toward the second end 132.

[0087] The winding region Z1 has: a stranded section 25 formed by twisting the first wire 21 and the second wire 22 together, and a parallel section 26 in which the first wire 21 and the second wire 22 are not twisted together and run parallel to each other. Specifically, the stranded section 25 constitutes the first turn and the sixth turn, and the parallel section 26 constitutes the second turn, the third turn, the fourth turn, and the fifth turn. The stranded section 25 and the parallel section 26 respectively constitute the first layer wound on the core section 13.

[0088] According to the above structure, the winding region Z1 has a parallel section 26, which allows the wires 21 and 22 to be tightly wound around the core section 13. This increases the number of turns of the coil 20 relative to the core section 13, thereby improving the inductance value. Furthermore, the winding region Z1 has a stranded section 25, which ensures mode switching characteristics.

[0089] Preferably, the stranded portion 25 is continuously wound around the core portion 13 at least one turn, and the twist rate of the stranded portion 25 in the state where the core portion 13 is continuously wound at least one turn is 1 or more. According to the above structure, compared with the case where the stranded portion 25 is continuously wound around the core portion 13 by 1 / 2 turn, or the case where the twist rate of the stranded portion 25 in the state where it is continuously wound around the core portion 13 is 1 / 2, the mode switching characteristics can be improved.

[0090] Preferably, the parallel portion 26 is continuously wound at least one turn in the core portion 13. According to the above structure, compared with the case where the parallel portion 26 is continuously wound 1 / 2 turn in the core portion 13, the number of turns of the coil can be further increased relative to the core portion 13, thereby further improving the inductance value.

[0091] Preferably, the twist rate of the stranded portion 25, as a whole, is a natural number. According to the above structure, the wires 21 and 22 of the stranded portion 25 can be symmetrically arranged as a whole. This allows for more thorough cancellation of the capacitive component of the stranded portion 25, thereby improving mode switching characteristics.

[0092] like Figure 4 As shown, in the winding region Z1, at least a portion of the stranded portion 25 is located at a position closest to at least one of the first end 131 and the second end 132 of the core portion 13. In this embodiment, the first stranded portion 25 is located at a position closest to the first end 131, and the second stranded portion 25 is located at a position closest to the second end 132. That is, the first stranded portion 25 constitutes the first turn, and the second stranded portion 25 constitutes the sixth turn.

[0093] According to the above structure, the first twisted section 25 is located closest to the first end 131. Therefore, in the first twisted section 25, which is close to the first electrode section 31 and the second electrode section 32, the capacitance difference between the first wire 21 and the second wire 22 can be reduced. This reduces the stray capacitance between the first twisted section 25 and the first and second electrode sections 31 and 32, thereby improving mode switching characteristics. Furthermore, the second twisted section 25 is located closest to the second end 132. Therefore, in the second twisted section 25, which is close to the third electrode section 33 and the fourth electrode section 34, the capacitance difference between the first wire 21 and the second wire 22 can be reduced. This reduces the stray capacitance between the second twisted section 25 and the third and fourth electrode sections 33 and 34, thereby improving mode switching characteristics.

[0094] Furthermore, at least a portion of the stranded portion 25 may also be located at the position closest to the first end 131 or the second end 132. That is, the stranded portion 25 may also constitute the first turn or the sixth turn. Alternatively, the stranded portion 25 may constitute the first turn and the sixth turn, but it may also constitute at least three turns from the second to the fifth turn.

[0095] (Second Implementation)

[0096] Figure 5 This is a schematic cross-sectional view showing a second embodiment of the coil component. The structure of the coil in the second embodiment differs from that in the first embodiment. This difference in structure will be described below. Other structures are the same as in the first embodiment, and are labeled with the same reference numerals as in the first embodiment, with their descriptions omitted.

[0097] like Figure 5 As shown, in the coil component 1A of the second embodiment, in the winding region Z1 of the coil 20A, at least a portion of the parallel portion 26 exists at a position closest to at least one of the first end 131 and the second end 132 of the core portion 13. In this embodiment, the first parallel portion 26 exists at a position closest to the first end 131, and the second parallel portion 26 exists at a position closest to the second end 132. That is, the first parallel portion 26 constitutes the first turn, and the second parallel portion 26 constitutes the sixth turn. In addition, the other parallel portions 26 constitute the fourth and fifth turns, and the stranded portion 25 constitutes the second and third turns.

[0098] According to the above structure, the first parallel section 26 exists at the position closest to the first end 131. Therefore, in the section from the first end 131 of the core section 13 where the first parallel section 26 exists to the first electrode section 31 and the second electrode section 32, the first wire 21 and the second wire 22 can be formed in a state where they are not twisted together. As a result, the lengths of the wires 21 and 22 drawn from the first end 131 of the core section 13 to the first electrode section 31 and the second electrode section 32 can be kept constant for each product, thereby suppressing the differences in characteristics of each product.

[0099] Furthermore, in the section from the first end 131 of the core portion 13 to the first and second electrode portions 31 and 32, the winding expansion of the wires 21 and 22 caused by twisting can be suppressed, thereby reducing the contact between the solder and the wires 21 and 22 led out from the first end 131 of the core portion 13 to the first and second electrode portions 31 and 32 when the coil component 1A is mounted on the mounting substrate.

[0100] Furthermore, the wires 21 and 22 can be left untwisted in the section from the first end 131 of the core portion 13 to the first and second electrode portions 31 and 32, and then twisted together after being wound around the first end 131 of the core portion 13. This stabilizes the starting position of the twisting of the wires 21 and 22 when winding them from the first end 131. In particular, by winding the first parallel portion 26 one or more turns, a stable winding method can be achieved.

[0101] Similarly, the second parallel section 26 exists at the position closest to the second end 132, so in the section from the second end 132 of the core section 13 where the second parallel section 26 exists to the third electrode section 33 and the fourth electrode section 34, the first wire 21 and the second wire 22 can be formed in a state where they are not twisted together. As a result, the lengths of the wires 21 and 22 drawn from the second end 132 of the core section 13 to the third and fourth electrode sections 33 and 34 can be kept constant for each product, thereby suppressing the differences in characteristics of each product.

[0102] Furthermore, in the section from the second end 132 of the core portion 13 to the third and fourth electrode portions 33 and 34, the winding expansion of the wires 21 and 22 caused by twisting can be suppressed, thereby reducing the contact between the solder and the wires 21 and 22 led out from the second end 132 of the core portion 13 to the third and fourth electrode portions 33 and 34 when the coil component 1A is mounted on the mounting substrate.

[0103] Furthermore, at least a portion of the parallel section 26 may also exist at the position closest to the first end 131 or the second end 132. That is, the parallel section 26 may also constitute the first turn or the sixth turn. In addition, the parallel section 26 may constitute the first turn and the sixth turn, but it may also constitute at least three of the second to fifth turns.

[0104] (Third Implementation)

[0105] Figure 6 This is a schematic cross-sectional view showing a third embodiment of the coil component. The structure of the coil in the third embodiment differs from that in the first embodiment. This difference in structure will be described below. Other structures are the same as in the first embodiment, and are labeled with the same reference numerals as in the first embodiment, with their descriptions omitted.

[0106] like Figure 6 As shown, in the coil component 1B of the third embodiment, in the winding region Z1 of the coil 20B, the stranded portion 25 and the parallel portion 16 are arranged alternately along the axis 13a. Specifically, the stranded portion 25 constitutes the first, third, and fifth turns, and the parallel portion 26 constitutes the second, fourth, and sixth turns. Alternatively, the stranded portion 25 may constitute the second, fourth, and sixth turns, and the parallel portion 26 may constitute the first, third, and fifth turns.

[0107] According to the above structure, the stranded section 25 and the parallel section 16 are arranged alternately along the axis 13a. This makes the capacitance of each turn of wire 21, 22 more uniform, thereby further improving the mode switching characteristics. In addition, the wires 21, 22 can be wound more tightly around the core section 13, thereby further improving the inductance value.

[0108] (Fourth Implementation)

[0109] Figure 7A This is a schematic cross-sectional view showing a fourth embodiment of the coil component. The structure of the coil in the fourth embodiment differs from that in the first embodiment. This difference in structure will be described below. Other structures are the same as those in the first embodiment, and are labeled with the same reference numerals as in the first embodiment, with their descriptions omitted.

[0110] like Figure 7A As shown, in the coil component 1C of the fourth embodiment, the parallel section 26 includes a first wire 21 and a second wire 22 that run parallel to each other without twisting. In the winding region Z1 of the coil 20C, at least a portion of the parallel section 26, consisting of one of the first wire 21 and the second wire 22 forming the same turn, forms a first layer L1 wound on the core section 13, and the other of the first wire 21 and the second wire 22 forming the same turn forms a second layer L2 wound on the first layer L1.

[0111] In a more detailed description, the parallel section 26 constitutes the fourth to eighth turns. Furthermore, the first and second wires 21 and 22 constituting the fourth turn, the second wire 22 constituting the fifth turn, the second wire 22 constituting the sixth turn, the second wire 22 constituting the seventh turn, and the second wire 22 constituting the eighth turn constitute the first layer L1. The first wire 21 constituting the fifth turn, the first wire 21 constituting the sixth turn, the first wire 21 constituting the seventh turn, and the first wire 21 constituting the eighth turn constitute the second layer L2. Additionally, the stranded section 25 constitutes the first to third turns, each turn constituting the first layer L1.

[0112] In other words, in the cross-section including shaft 13a, the arrangement direction of at least a portion of the first wire 21 and the second wire 22 forming the same turn in the parallel portion 26 is not parallel to shaft 13a, but rather intersects shaft 13a. The arrangement direction of the first wire 21 and the second wire 22 is the direction that connects the center of the first wire 21 and the center of the second wire 22. Preferably, the arrangement direction of the first wire 21 and the second wire 22 is slightly inclined relative to the direction orthogonal to shaft 13a.

[0113] Specifically, in the cross-section including shaft 13a, the arrangement directions of the first wire 21 and the second wire 22 constituting the fifth turn, the sixth turn, the seventh turn, and the eighth turn are parallel to each other and intersect shaft 13a. The arrangement direction of the first wire 21 and the second wire 22 constituting the fourth turn is parallel to shaft 13a.

[0114] According to the above structure, at least a portion of the parallel section 26, consisting of the first wire 21 and the second wire 22 forming the same turn, constitutes a double layer, thereby increasing the number of turns of the coil 20C and further improving the inductance value. Alternatively, the first wire 21 forming the fifth to eighth turns may form the first layer L1, and the second wire 22 forming the fifth to eighth turns may form the second layer L2.

[0115] Figure 7B This is a schematic cross-sectional view showing a first modified example of the coil component. For example... Figure 7B As shown, in the coil component 1D of the first modified example, besides Figure 7A In addition to the structure, in the winding area Z1 of the coil 20D, the stranded part 25 forms a first layer L1 formed by continuously winding multiple turns of the core part 13, and a second layer L2 formed by continuously winding multiple turns of the first layer L1.

[0116] In a more detailed description, the stranded section 25 comprises the first to fifth turns. Furthermore, the first to third turns constitute the first layer L1. The fourth and fifth turns constitute the second layer L2.

[0117] Furthermore, the parallel section 26 constitutes the sixth to tenth turns. Moreover, the first and second wires 21 and 22 constituting the sixth turn, the second wire 22 constituting the seventh turn, the second wire 22 constituting the eighth turn, the second wire 22 constituting the ninth turn, and the second wire 22 constituting the tenth turn constitute the first layer L1. The first wire 21 constituting the seventh turn, the first wire 21 constituting the eighth turn, the first wire 21 constituting the ninth turn, and the first wire 21 constituting the tenth turn constitute the second layer L2.

[0118] According to the above structure, the stranded section 25 is double-layered, thus increasing the number of turns in the coil 20D and further improving the inductance value. Alternatively, the parallel section 26 can also be a single-layered structure.

[0119] Figure 7C This is a schematic cross-sectional view showing a second modified example of the coil component. (Example) Figure 7C As shown, in the coil component 1F of the second modified example, with Figure 7A Compared to the structure of the first part, the structure of the parallel part is different. That is, in the coil component 1F of the second modified example, in the winding region Z1 of the coil 20F, the parallel part 26 is formed by a first layer L1 formed by continuously winding multiple turns of the core part 13, and a second layer L2 formed by continuously winding multiple turns of the first layer L1.

[0120] In a more specific description, the parallel section 26 constitutes the fourth to eighth turns. Furthermore, the fourth to sixth turns constitute the first layer L1. The seventh and eighth turns constitute the second layer L2. In addition, the stranded section 25 constitutes the first to third turns, each turn constituting the first layer L1.

[0121] In other words, in the cross section including shaft 13a, the arrangement direction of the first wire 21 and the second wire 22 constituting the same turn in the parallel section 26 is parallel to shaft 13a.

[0122] In a more specific description, in the cross section including shaft 13a, the arrangement directions of the first wire 21 and the second wire 22 constituting the fourth turn, the arrangement directions of the first wire 21 and the second wire 22 constituting the fifth turn, the arrangement directions of the first wire 21 and the second wire 22 constituting the sixth turn, the arrangement directions of the first wire 21 and the second wire 22 constituting the seventh turn, and the arrangement directions of the first wire 21 and the second wire 22 constituting the eighth turn are parallel to each other and parallel to shaft 13a.

[0123] According to the above structure, the parallel section 26 forms a double layer, which can increase the number of turns of the coil 20F, thereby further improving the inductance value.

[0124] Furthermore, other variations of the coil component will be described. Although not shown, in the winding region Z1, either the stranded portion 25 or the parallel portion 26 constitutes a first layer L1 formed by continuously winding multiple turns on the core portion 13, and the other stranded portion 25 or the parallel portion 26 constitutes a second layer L2 formed by continuously winding multiple turns on the first layer L1. Alternatively, in the winding region Z1, the regions where the first layer L1 is the stranded portion 25 and the second layer L2 is the parallel portion 26, and the regions where the first layer L1 is the parallel portion 26 and the second layer L2 is the stranded portion 25, may be mixed together.

[0125] According to the above structure, the stranded section 25 and the parallel section 26 form a double-layer structure, thus increasing the number of turns of the coil and further improving the inductance value. Furthermore, increasing the stranded section 25 and the parallel section 26 increases the number of turns of the coil and further improves the mode switching characteristics.

[0126] (Fifth Implementation)

[0127] Figure 8 This is an end view showing the coil assembly as viewed from the outer surface of the first flange. The fifth embodiment differs from the first embodiment in the wire lead-out position and the structure of the flange. This difference in structure will be described below. Other structures are the same as in the first embodiment, and are labeled with the same reference numerals as in the first embodiment, with their descriptions omitted.

[0128] like Figure 8As shown, in the coil component 1E of the fifth embodiment, when viewed from the direction of axis 13a, the first electrode portion 31 and the second electrode portion 32 are symmetrically arranged with respect to the central position C of the left and right width W of the first flange portion 11E. The left and right width W refers to the dimension between the left and right side surfaces 115, 115 of the first flange portion 11E. When viewed from the direction of axis 13a, the first wire 21 is led out from the central position C of the left and right width W of the first flange portion 11E in the core portion 13 toward the first electrode portion 31, and the second wire 22 is led out from the central position C of the left and right width W of the first flange portion 11E in the core portion 13 toward the second electrode portion 32.

[0129] In a more specific description, the first flange portion 11E has a groove 110 that opens to the inner surface 111, the outer surface 112, and the upper surface 114. The first wire 21 and the second wire 22 are led out from the core portion 13 through the groove 110 to the first and second electrode portions 31 and 32, respectively. The first wire 21 is connected to the portion of the first electrode portion 31 disposed on the outer surface 112, and the second wire 22 is connected to the portion of the second electrode portion 32 disposed on the outer surface 112.

[0130] According to the above structure, the length from the core portion 13 of the first wire 21 to the first electrode portion 31 can be made the same as the length from the core portion 13 of the second wire 22 to the second electrode portion 32, thereby further improving the mode switching characteristics.

[0131] Furthermore, the first wire 21 is partially connected to the outer surface 112 of the first electrode portion 31, but not to the mounting surface, i.e., the lower surface 113 of the first electrode portion 31. This reduces the likelihood of the first wire 21 coming into contact with the solder. Consequently, damage to the first wire 21 during installation or reliability testing is reduced, thereby lowering the risk of the first wire 21 breaking. Alternatively, the first electrode portion 31 can be continuously provided across the upper surface 114, outer surface 112, and lower surface 113 of the first flange portion 11. In this case, by connecting the first wire 21 to the portion of the first electrode portion 31 located on the upper surface 114, the likelihood of the first wire 21 coming into contact with the solder can be further reduced.

[0132] Similarly, the second wire 22 is connected to the outer surface 112 of the second electrode portion 32, but not to the mounting surface, i.e., the lower surface 113 of the second electrode portion 32, thus reducing the contact between the second wire 22 and the solder.

[0133] Although not shown in the figure, the second flange portion is the same as the first flange portion 11E. That is, when viewed from the axis 13a direction, the third electrode portion 33 and the fourth electrode portion 34 are symmetrically arranged with respect to the central position of the left and right width of the second flange portion, and the first wire 21 and the second wire 22 are led out from the central position of the left and right width of the second flange portion in the core portion 13 to the third electrode portion 33 and the fourth electrode portion 34.

[0134] According to the above structure, the length from the core portion 13 of the first wire 21 to the third electrode portion 33 can be made the same as the length from the core portion 13 of the second wire 22 to the fourth electrode portion 34, thereby further improving the mode switching characteristics.

[0135] Furthermore, this disclosure is not limited to the above-described embodiments, and design changes can be made without departing from the spirit of this disclosure. For example, the features of each of the first to fifth embodiments can be combined in various ways.

[0136] In the above embodiments, the coil component is used as a common-mode choke coil, but it can also be used, for example, as a wound coil in which multiple wires of a transformer, coupled inductor array, etc., are wound around a core. In these wound coils, it is also beneficial to reduce the capacitance between the wires.

[0137] In the above embodiment, although a plate component is provided, it may be omitted. In the above embodiment, the coil includes two wires, but the coil may also include multiple wires, or even three or more wires. In this case, the stranded section is not limited to a structure of two twisted wires, and may also be formed as a structure of three or more twisted wires. In addition, the number of electrode sections may be increased as the number of wires increases.

[0138] In the above embodiments, at least one of the stranded portion and the parallel portion is wound onto the core portion in a single layer or double layer, but at least one of the stranded portion and the parallel portion may also be wound onto the core portion in three or more layers.

[0139] In the above embodiments, the stranded portion exists in the region wound around the core portion, but it may also exist in the region not wound around the core portion. For example, the stranded portion may also exist in the non-wound region from the electrode portion to the core portion.

Claims

1. A coil component, wherein, have: Core, having a winding core section; and The coil is wound along the axis of the core portion and comprises multiple wires. The core includes a first flange portion disposed at a first end of the core portion and a second flange portion disposed at a second end of the core portion. The coil has a winding area wound around the core portion. The winding area has a stranded section formed by twisting the plurality of wires together, and a parallel section in which the plurality of wires are not twisted together and run parallel to each other. The parallel portion exists at the position closest to the first end and the second end. The area of ​​the winding region other than the parallel section is the stranded section.

2. The coil component according to claim 1, wherein, The stranded section is wound continuously around the core section at least one turn, and the twist of the stranded section is 1 or more when the core section is wound continuously at least one turn.

3. The coil component according to claim 1 or 2, wherein, The parallel section is continuously wound at least one turn in the core section.

4. The coil component according to claim 1 or 2, wherein, As a whole, the twist count of the stranded section is a natural number.

5. The coil component according to claim 1 or 2, wherein, The coil component further includes a plurality of electrode portions disposed on the first flange portion and connected to the coil, and a plurality of electrode portions disposed on the second flange portion and connected to the coil.

6. The coil component according to claim 1 or 2, wherein, The parallel section includes a first wire and a second wire that are parallel to each other without being twisted. In the winding region, at least a portion of the parallel portion, one of the first wire and the second wire forming the same turn, forms a first layer wound on the core portion, and the other of the first wire and the second wire forming the same turn forms a second layer wound on the first layer.

7. The coil component according to claim 1 or 2, wherein, In the winding region, the stranded portion constitutes a first layer that is continuously wound multiple turns on the core portion, and a second layer that is continuously wound multiple turns on the first layer.

8. The coil component according to claim 1 or 2, wherein, In the winding region, either the stranded portion or the parallel portion constitutes a first layer that is continuously wound multiple turns in the core portion, and the other stranded portion or the parallel portion constitutes a second layer that is continuously wound multiple turns on the first layer.

9. The coil component according to claim 1 or 2, wherein, The core includes a first flange portion disposed at a first end of the core portion and a second flange portion disposed at a second end of the core portion. The coil component further includes a first electrode portion and a second electrode portion disposed on the first flange portion, and a third electrode portion and a fourth electrode portion disposed on the second flange portion. The coil includes a first wire electrically connected to the first electrode portion and the third electrode portion, and a second wire electrically connected to the second electrode portion and the fourth electrode portion. When viewed axially from the axis of the winding core, the first electrode portion and the second electrode portion are symmetrically arranged with respect to the central position of the left and right widths of the first flange portion. The first wire and the second wire are led out from the central position of the left and right widths of the first flange portion in the winding core portion toward the first electrode portion and the second electrode portion, respectively. When viewed from the axial direction, the third electrode portion and the fourth electrode portion are symmetrically arranged with respect to the central position of the left and right widths of the second flange portion, and the first wire and the second wire are led out from the central position of the left and right widths of the second flange portion in the core portion toward the third electrode portion and the fourth electrode portion.

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