Coil parts

Abstract

To provide a coil component in which a position deviation of a wire wound to a surround of a winding core part in a state of forming a plurality of layers is hardly generated.SOLUTION: A first wire 3 is wound toward a second end part 8 from a first end part 7 in a state of constructing a first layer. A second wire 4 is wound toward a second end part from the first end part in a state of constructing a second layer while being fitted into a concave part formed between adjacent turns of the first wire 3. Sequentially, it is conducted from an end part on the second end part side to an external peripheral side of the second layer so as to be returned to the first end part side, and is wound in a state of constructing a third layer while being fitted into the concave part formed between the adjacent turns of the second wire 4 constructing the second layer. Next, it is conducted to a position of the second layer on the outer peripheral side of the first layer, and is wound toward the second end part from the first end part in a state of constructing the second layer while being fitted into the concave part formed between the adjacent turns of the first wire 3 of the first layer.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to coil components, and more particularly to improvements in the winding pattern of wire in a wound coil component having a structure in which two wires are wound around a winding core to form multiple layers. [Background technology]

[0002] In this case, the nth turn of the first wire and the second wire wound around the winding core is expressed as "turn Tn". In addition, regarding the amount of deviation between the first wire and the second wire, for example, when the turn Tn of the second wire fits into the recess between the turn Tn and the turn Tn+1 of the first wire, the amount of deviation is "0.5 turns". Similarly, when the turn Tn+2 of the second wire fits into the recess between the turn Tn and the turn n+1 of the first wire, the amount of deviation is "1.5 turns", and when the turn Tn+3 of the second wire fits into the recess between the turn Tn and the turn n+1 of the first wire, the amount of deviation is "2.5 turns". In addition, regarding the direction of deviation between the first wire and the second wire, when a turn of the second wire is located closer to the end side of the winding direction than the same turn of the first wire, "+" is added before the number representing the amount of deviation, and when the opposite is true, "-" is added.

[0003] It does not matter whether the wire turns are counted from the first end of the winding core or from the second end. Even if the turn counting direction is reversed, the configuration is essentially the same.

[0004] In addition, in this case, of the multiple layers formed by the wire wound around the winding core, the layer closest to the circumferential surface of the winding core, i.e., the layer at least partially in contact with the circumferential surface of the winding core, is referred to as the first layer, the layer on the outer periphery of the first layer as the second layer, and the layer on the outer periphery of the second layer as the third layer. Note that the reason why the first layer, which is the layer closest to the circumferential surface of the winding core, is said to be in contact with the circumferential surface of the winding core at least in part, is because the wire does not normally contact the circumferential surface of the winding core over its entire length, but rather, for example, only contacts the ridges of the winding core, which has a square cross section, and the other parts are usually slightly raised above the circumferential surface of the winding core.

[0005] A typical example of a coil component to which the present invention is directed is a common mode choke coil.

[0006] A common mode choke coil of interest to this invention is described in, for example, Japanese Patent No. 6327397 (Patent Document 1). Fig. 11(A) is a cross-sectional view that shows a typical characteristic configuration of the winding state of two wires 51 and 52 provided in a coil component 50 that serves as the common mode choke coil described in Patent Document 1. Fig. 11(A) corresponds to Fig. 2, Fig. 7 or Fig. 8 in Patent Document 1. Fig. 11(B) is intended to explain the problem described below.

[0007] 11(A) and (B), the cross section showing the first wire 51 is shaded so that the first wire 51 and the second wire 52 can be clearly distinguished from each other. The first wire 51 and the second wire 52 are wound helically around the winding core 53 from a first end 54 of the winding core 53 toward an opposite second end 55 with substantially the same number of turns. The first wire 51 is wound in a state of constituting a first layer in contact with the circumferential surface of the winding core 53, and the second wire 52 is wound in a state of constituting a second layer outside the first layer with most of the wire 52 fitting into recesses formed between adjacent turns of the first wire 51.

[0008] As described above, the majority of the second wire 52 is wound to form the second layer outside the first layer because some turns of the second wire 52, for example, turn Tn and turn Tn+1, are wound so as to be in contact with the circumferential surface of the winding core portion 53.

[0009] 11(A) and 11(B), each of the multiple turns of the first wire 51 and each of the multiple turns of the second wire 52 are connected by line segments. In this manner, the turns connected by line segments are the same turn counted from the first end 54.

[0010] A coil component 50 described in Patent Document 1 was developed with the aim of reducing the mode conversion characteristics in a common mode choke coil, and the embodiment shown in FIG. 11(A) has the following features.

[0011] That is, when expressed by the number of turns n (n is a natural number) of the first wire 51 and the second wire 52 counted from the first end 54 side, the coil device 50 has the following structure: (1) A +0.5 shift region 57 in which the turn n of the second wire 52 fits into a recess between the turn Tn and the turn Tn+1 of the first wire 51, resulting in a shift of 0.5 turns between the first wire and the second wire; (2) A −1.5 shift region 58 in which the first wire 51 and the second wire 52 are shifted by 1.5 turns in a direction opposite to the direction of shift in the +0.5 shift region by fitting the turn Tn+2 of the second wire 52 into a recess between the turn Tn and the turn Tn+1 of the first wire 51; (3) a transition region 59 that transitions from the +0.5 deviation region 57 to the −1.5 deviation region 58; It has.

[0012] The sum of the number of turns of the second wire 52 located in the 0.5 offset region 57 is not less than two times and not more than five times the sum of the number of turns of the second wire 52 located in the 1.5 offset region 58.

[0013] With this configuration, the capacitance generated between the first wire 51 and the second wire 52 can be balanced across the first wire 51 and the second wire 52, thereby reducing the effect of the stray capacitance generated between the first wire 51 and the second wire 52. Therefore, for example, in a common mode choke coil, the mode conversion characteristics can be reduced. [Prior art documents] [Patent documents]

[0014] [Patent Document 1] Patent No. 6327397 Summary of the Invention [Problem to be solved by the invention]

[0015] In the winding state shown in FIG. 11(A), when attention is paid to the second wire 52, the turn Tn+2 at the beginning of the −1.5 shift region 58 is not in contact with any wire on the side of its first end 54, and the turn Tn+1 at the end of the transition region 59 is also not in contact with any wire on the side of its first end 54, so the turn Tn+2 is likely to shift in the direction shown by the arrow 60 in FIG. 11(A). As a result, as shown in FIG. 11(B), the turn Tn+2 may climb over the turn Tn+1 and fall between the turn Tn and the turn Tn+1. Although not shown in FIG. 11(B), if the interval between the turn Tn and the turn Tn+1 is wider, the turn Tn+2 may come into contact with the circumferential surface of the winding core portion 53.

[0016] The above-mentioned step-down of the turn Tn+2 may occur in the finished product of the coil component 50, but if it occurs during the process of winding the second wire 52 from the first end 54 to the second end 55, the subsequent turns Tn+3, ... will be sequentially misaligned. As a result, the misalignment region 58 is no longer a -1.5 misalignment region, but becomes, for example, a -2.5 misalignment region. The balance of the capacitance generated between the first wire 51 and the second wire 52 is lost, and the mode conversion characteristics may deteriorate.

[0017] The same type of misalignment problem is not limited to common mode choke coils, but can also be encountered, for example, in wound chip transformers that also include a first wire and a second wire.

[0018] SUMMARY OF THE PRESENT DISCLOSURE An object of the present invention is to provide a coil component in which misalignment of the wire wound in multiple layers around a core portion is less likely to occur. [Means for solving the problem]

[0019] The present invention is directed to a coil component comprising a core including a winding core having a first end and a second end opposite to each other in an axial direction, and a first wire and a second wire wound spirally around the winding core with substantially the same number of turns.

[0020] In the following, of the multiple layers formed by the wire wound around the winding core, the layer closest to the peripheral surface of the winding core will be referred to as the first layer, the layer on the outer periphery of the first layer as the second layer, and the layer on the outer periphery of the second layer as the third layer.

[0021] The first wire includes a portion wound from a first end to a second end in a first layer.

[0022] The second wire is (1) a first portion that is wound from a first end to a second end in a state where the first portion fits into a recess formed between adjacent turns of the first wire and constitutes a second layer on the outer circumferential side of the first layer; (2) a second portion connected to the first portion, returning from an end portion on the second end side of the first portion to the first end side and leading to an outer peripheral side of the second layer; (3) a third portion that is connected to the second portion and wound in a state of constituting a third layer on the outer circumferential side of the second layer; (4) a fourth portion extending from the third portion to a position of the second layer on the outer periphery of the first layer; (5) a fifth portion connected to the fourth portion and wound from the first end toward the second end in a state in which the fifth portion fits into a recess formed between adjacent turns of the first wire of the first layer and constitutes a second layer on the outer circumferential side of the first layer; Includes.

[0023] In the third portion, the second wire is wound N turns (N is a natural number equal to or greater than 2).

[0024] Furthermore, on either the first end side or the second end side of the boundary between the first portion and the fifth portion, there is a +0.5 shift region, where the first wire and the second wire are shifted by 0.5 turns, and on the other of the first end side or the second end side of the boundary between the first portion and the fifth portion, there is a -(N-0.5) turn shift region, where the first wire and the second wire are shifted by (N-0.5) turns in a shift direction opposite to the shift direction in the +0.5 shift region.

[0025] In this invention, the (5) fifth portion may be configured to be connected to the fourth portion, and to be wound from the first end to the second end in a state where the fifth portion is connected to the fourth portion and separated from the first portion by one turn of the second wire, and fits into a recess formed between adjacent turns of the first wire in the first layer and constitutes a second layer on the outer circumferential side of the first layer. In this case, a -(N-1.5) turn shift region is present on either the first end side or the second end side of the boundary between the first portion and the fifth portion, where the first wire and the second wire are shifted by (N-1.5) turns in a shift direction opposite to that in the +0.5 shift region. Effect of the Invention

[0026] According to this invention, the second wire includes a second portion that is connected to the first portion and is returned from an end on the second end side of the first portion to the first end side and led to the outer periphery of the second layer, and a third portion that is connected to the second portion and is wound in a state of constituting a third layer on the outer periphery of the second layer while fitting into a recess formed between adjacent turns of the second wire that constitutes the second layer, thereby making it possible to prevent the second wire from becoming misaligned.

[0027] Also, on either the first end side or the second end side of the boundary between the first part and the fifth part of the second wire, there is a +0.5 shift region where the first wire and the second wire are shifted by 0.5 turns. On the other side of either the first end side or the second end side of the boundary between the first part and the fifth part, there is a -(N - 0.5) turn shift region where the first wire and the second wire are shifted by (N - 0.5) turns in the direction opposite to the shift direction in the +0.5 shift region, or a -(N - 1.5) turn shift region where the first wire and the second wire are shifted by (N - 1.5) turns. Therefore, the influence of the parasitic capacitance generated between the first wire and the second wire can be reduced. Thus, for example, in a common mode choke coil, the mode conversion characteristics can be reduced.

Brief Description of the Drawings

[0028] [Figure 1] This shows the surface of the coil component 1 according to the first embodiment of the present invention that faces the mounting substrate side. [Diagram 2] This schematically shows the winding states of the first wire 3 and the second wire 4 in the coil component 1 shown in FIG. 1. (A) shows a part of the bobbin part 5 around which the first wire 3 and the second wire 4 are wound, and is a cross-sectional view taken along line A - A in (B). (B) is a developed view of the peripheral surface of the bobbin part 5 around which the first wire 3 and the second wire 4 are wound. [Diagram 3] This is a view showing the winding state of the second wire 4 from the front, with the portion III surrounded by the broken line in FIG. 2(B) enlarged. [Figure 4] This is a cross-sectional view schematically showing a part of the bobbin part 5 around which the first wire 3 and the second wire 4 are wound in the coil component according to the second embodiment of the present invention. [Diagram 5] This is a cross-sectional view schematically showing a part of the bobbin part 5 around which the first wire 3 and the second wire 4 are wound in the coil component according to the third embodiment of the present invention. [Figure 6] This is a cross-sectional view schematically showing a part of the bobbin part 5 around which the first wire 3 and the second wire 4 are wound in the coil component according to the fourth embodiment of the present invention. [Figure 7] 10 is a cross-sectional view that diagrammatically shows a part of a winding core 5 around which a first wire 3 and a second wire 4 are wound in a coil device according to a fifth embodiment of the present invention. FIG. [Figure 8] 13 is a cross-sectional view that diagrammatically shows a part of a winding core 5 around which a first wire 3 and a second wire 4 are wound in a coil device according to a sixth embodiment of the present invention. FIG. [Figure 9] 13 is a cross-sectional view that illustrates a schematic view of a part of a winding core 5 around which a first wire 3 and a second wire 4 are wound in a coil device according to a seventh embodiment of the present invention. FIG. [Figure 10] 13 is a cross-sectional view that illustrates a schematic view of a part of a winding core 5 around which a first wire 3 and a second wire 4 are wound in a coil device according to an eighth embodiment of the present invention. FIG. [Figure 11] 1A and 1B are cross-sectional views showing a schematic winding state of two wires 51 and 52 provided in a coil device 50 described in Patent Document 1, where (A) shows the characteristic configuration of the winding state of the two wires 51 and 52, and (B) is intended to explain the problem that the present invention aims to solve. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] 1 shows a surface of a coil component 1 according to a first embodiment of the present invention that faces a mounting board (not shown). The coil component 1 serves as a common mode choke coil.

[0030] The coil component 1 includes a drum-shaped core 2 and a first wire 3 and a second wire 4 each of which constitutes an inductor. The core 2 is made of a non-conductive material, more specifically, a ferrite such as Ni-Zn ferrite, or a resin containing ferrite powder or metal magnetic powder.

[0031] The core 2 includes a winding core portion 5 and a first flange portion 9 and a second flange portion 10 respectively extending from a first end portion 7 and a second end portion 8 that are opposite to each other in the axial direction 6 of the winding core portion 5. The cross section of the winding core portion 5 perpendicular to the axial direction 6 is rectangular. Note that the ridges of the winding core portion 5 having a rectangular cross section may be chamfered, or the cross section of the winding core portion 5 may be a polygonal shape such as a hexagon, a circle, an ellipse, or an appropriate combination of these.

[0032] The first flange portion 9 and the second flange portion 10 are in the shape of a quadrangular prism. The first flange portion 9 has a bottom surface 11 facing the mounting board, a top surface 13 (see FIG. 2) facing the opposite direction to the bottom surface 11, an inner end surface 15 on which the first end portion 7 of the winding core portion 5 is located, an outer end surface 17 opposite the inner end surface 15 and facing outward, and a first side surface 19 and a second side surface 20 connecting between the bottom surface 11 and the top surface 13 and between the inner end surface 15 and the outer end surface 17. Similarly, the second flange portion 10 has a bottom surface 12 facing the mounting board, a top surface 14 facing in the opposite direction to the bottom surface 12, an inner end surface 16 on which the second end 8 of the winding core portion 5 is located, an outer end surface 18 opposite the inner end surface 16 and facing outward, and a first side surface 21 and a second side surface 22 connecting between the bottom surface 12 and the top surface 14 and between the inner end surface 16 and the outer end surface 18. The ridge portions of the first flange portion 9 and the second flange portion 10 may be chamfered.

[0033] The coil component has four or more terminal electrodes. In this embodiment, the coil component 1 has four terminal electrodes 23 to 26. A first terminal electrode 23 and a third terminal electrode 25 are provided on the lower surface 11 of the first flange portion 9, and a second terminal electrode 24 and a fourth terminal electrode 26 are provided on the lower surface 12 of the second flange portion 10. Although not shown, the first terminal electrode 23 and the third terminal electrode 25 extend to a part of the outer end surface 17 of the first flange portion 7, and the second terminal electrode 24 and the fourth terminal electrode 26 extend to a part of the outer end surface 18 of the second flange portion 8.

[0034] The terminal electrodes 23-26 are formed, for example, by baking a conductive paste containing silver as a conductive component onto the lower surfaces 11 and 12, evaporating silver onto the portions extending to the outer end surfaces 17 and 18, and then plating the underlying conductive film with copper, nickel, and tin in that order. The terminal electrodes 23-26 may also be provided by attaching metal terminals made of a conductive metal plate to the core 2 using, for example, an epoxy adhesive.

[0035] The first wire 3 and the second wire 4 are wound in a spiral shape around the winding core 5. The details of the winding state of the first wire 3 and the second wire 4 will be described later. The first wire 3 and the second wire 4 each have a linear central conductor made of a highly conductive metal such as copper, silver or gold, and the central conductor is covered with an electrically insulating coating made of a resin such as polyurethane or polyamideimide. The diameter of the linear central conductor is not particularly limited. Furthermore, the number of turns of the first wire 3 and the second wire 4 is not particularly limited. Preferably, the diameter of the first wire 3 and the second wire 4 is 20 to 100 μm.

[0036] The respective ends of the first wire 3 are connected to a first terminal electrode 23 and a second terminal electrode 24, and the respective ends of the second wire 4 are connected to a third terminal electrode 25 and a fourth terminal electrode 26. For these connections, for example, thermocompression bonding is applied.

[0037] The coil component 1 further includes a top plate 27. The top plate 27 is made of the same type of ferrite as the material of the core 2, a non-conductive magnetic material other than ferrite, or a resin containing ferrite powder or metal magnetic powder. The top plate 27 is joined to the top surface 13 of the first flange 9 and the top surface 14 of the second flange 10 via an adhesive while being stretched between the first flange 9 and the second flange 10 of the core 2. As the adhesive, a thermosetting epoxy resin or a composite magnetic resin in which a metal magnetic powder or ferrite powder having a particle size of 0.1 to 10 μm is added to a thermosetting epoxy resin is preferably used. Inorganic fillers such as silica filler or inorganic magnetic powder may be added to the adhesive to improve thermal shock resistance. Methods of applying the adhesive include a method of dipping the top surfaces 13 and 14 of the flanges 9 and 10 of the core 2 into the adhesive, a method of dispensing or printing the adhesive on the surface of the top plate 27 facing the core 2, and the like.

[0038] A resin coating may be applied instead of the top plate 27. Furthermore, both the top plate 27 and the coating may be omitted.

[0039] The coil device 1 is manufactured, for example, as follows.

[0040] To manufacture the core 2, for example, ferrite powder is press-molded in a die, the resulting molded body is sintered, and after sintering, burrs are removed by barrel polishing.

[0041] Next, in order to provide the terminal electrodes 23 to 26 on the obtained core 2, a base conductor film is formed, and then barrel plating is performed.

[0042] Next, the wires 3 and 4 are discharged from a nozzle and wound around the winding core portion 5 of the core 2. The wires 3 and 4 are usually wound separately. That is, the first wire 3 is wound first, and its ends are thermocompressed to the first terminal electrode 23 and the second terminal electrode 24 by a heater tip. Next, the second wire 4 is wound, and its ends are thermocompressed to the third terminal electrode 25 and the fourth terminal electrode 26 by a heater tip. Excess portions of the wires 3 and 4 connected to the terminal electrodes 23 to 26 are cut and removed by a cutting blade. The first wire 3 and the second wire 4 may be wound simultaneously.

[0043] Then, top plate 27 is attached to core 2 with an adhesive. In this manner, coil component 1 is completed. The dimensions of coil component 1 are not particularly limited, but for example, the dimension in axial direction 6 is 3.2 mm, the dimension in width direction (vertical direction in FIG. 1) is 2.5 mm, and the dimension in height direction (direction perpendicular to the paper surface of FIG. 1) is 2.5 mm.

[0044] The wound state of the first wire 3 and the second wire 4 in the coil device 1 shown in Fig. 1 will be described with reference mainly to Fig. 2 and Fig. 3. Fig. 2(A) shows a cross section of a part of the winding core 5 around which the first wire 3 and the second wire 4 are wound. Fig. 2(B) shows an expanded view of the circumferential surface of the winding core 5 around which the first wire 3 and the second wire 4 are wound. Fig. 3 shows the wound state of the second wire 4 from the front by enlarging a portion III surrounded by a dashed line in Fig. 2(B).

[0045] 2(A), the cross section showing the first wire 3 is shaded to clearly distinguish the first wire 3 from the second wire 4. The first wire 3 is spirally wound from a first end 7 to a second end 8 in a state where it constitutes a first layer in contact with the peripheral surface of the winding core 5. The second wire 4 is spirally wound with substantially the same number of turns as the first wire 3 in a state where most of it constitutes a second layer on the outer peripheral side of the first layer.

[0046] In FIG. 2(A), each of the multiple turns of the first wire 3 and each of the multiple turns of the second wire 4 are connected by line segments. In this way, the turns connected by line segments are the same numbered turn counted from the first end 7. Numbers are written under each turn of the first wire 3. These numbers indicate the number of each turn of the first wire 3. Therefore, each turn of the second wire 4 connected by line segments to each turn of the first wire 3 is also the same numbered turn. In the wound state shown in FIG. 2(A), both the first wire 3 and the second wire 4 have turns T1 to T21.

[0047] The above description of the drawing method for FIG. 2(A) also applies to FIGS. 4 to 10 described later.

[0048] As described above, the first flange portion 9 and the second flange portion 10 are rectangular prism-shaped and have peripheral surfaces consisting of bottom surfaces 11 and 12, top surfaces 13 and 14, first side surfaces 19 and 21, and second side surfaces 20 and 22. On the other hand, the winding core portion 5 has a rectangular cross section perpendicular to the axial direction 6, and four faces are formed on its peripheral surface. Therefore, for the four peripheral faces of the winding core portion 5, the faces that face in the same direction as the bottom surface, top surface, first side surface, and second side surface of the flange portions 9 and 10 will similarly be referred to as the "bottom surface," the "top surface," the "first side surface," and the "second side surface."

[0049] As shown in Fig. 2(B), the winding core 5 has a circumferential surface including a bottom surface 29, a top surface 30, a first side surface 31, and a second side surface 32. Fig. 2(A) shows a cross section of the wires 3 and 4 on the top surface 30 of the winding core 5.

[0050] In FIG. 2(B), the first wire 3 is indicated by a thick dotted line, and the second wire 4 is indicated by a thick solid line. In reality, the first wire 3 in the first layer is mostly hidden by the second wire 4, but in the development view of FIG. 2(B), the thick dotted line indicates the position of the central axis of the first wire 3, and the thick solid line indicates the position of the central axis of the second wire 4. Therefore, the first wire 3 in the first layer and the second wire 4 in the second layer are shown side by side. As can be seen from FIG. 2(A), a part of the second wire 4 is in a position that constitutes the third layer, but the second wire 4 in the third layer and the second wire 4 in the second layer adjacent thereto are also shown side by side, and the turn of the first wire 3 in the first layer directly below the turn of the second wire 4 in the third layer is omitted from the illustration.

[0051] As described above, the first wire 3 is spirally wound from the first end 7 to the second end 8 in a state where the first layer contacts the circumferential surface of the winding core 5.

[0052] On the other hand, the second wire 4 is (1) A first portion (turns T1 to T9) that is wound from the first end 7 to the second end 8 in a state where the first portion (turns T1 to T9) fits into a recess formed between adjacent turns of the first wire 3 and constitutes a second layer on the outer circumferential side of the first layer, and (2) a second portion 34 (turn T9→T10) (the shaded portion in FIG. 3 ) that is connected to the first portion and returns from the end portion on the second end 8 side of the first portion to the first end 7 side and is led to the outer periphery side of the second layer; (3) a third portion (turns T10 to T11) that is connected to the second portion 34 and that is wound from the first end 7 to the second end 8 in a state of constituting a third layer on the outer circumferential side of the second layer while fitting into a recess formed between adjacent turns of the second wire 4 that constitutes the second layer; (4) a fourth portion 35 (turn T11→T12) connected to the third portion and extending from an end portion on the second end 8 side of the third portion to a position of the second layer on the outer periphery side of the first layer; (5) a fifth portion (turns T12 to T17) that is connected to the fourth portion 35 and that is wound from the first end 7 to the second end 8 in a state where the fifth portion (turns T12 to T17) is connected to the fourth portion 35 and is adjacent to the first portion, and that fits into a recess formed between adjacent turns of the first wire 3 in the first layer and that constitutes a second layer on the outer circumferential side of the first layer; Includes.

[0053] In the third portion, the second wire 4 is wound with N turns (N is a natural number of 2 or more), specifically, with two turns, a turn T10 and a turn T11.

[0054] According to the above configuration, the second wire 4 includes a second portion connected to the first portion, returning from an end of the first portion on the second end 8 side to the first end 7 side and leading to the outer periphery of the second layer, and a third portion connected to the second portion and wound from the first end 7 to the second end 8 in a state of constituting a third layer on the outer periphery of the second layer while fitting into a recess formed between adjacent turns of the second wire 4 constituting the second layer, and the fifth portion is adjacent to the first portion, so that the second wire 4 is less likely to be displaced. Therefore, the second wire 4 can be wound in an appropriate position and can maintain the appropriate winding position in the fifth portion.

[0055] Also, on either the first end 7 side or the second end 8 side of the boundary between the first portion and the fifth portion, in this embodiment, on the first end 7 side, there is a +0.5 shift region 37 where the first wire 3 and the second wire 4 are shifted by 0.5 turns. On the other hand, on the other of the first end 7 side or the second end 8 side of the boundary between the first portion and the fifth portion, in this embodiment, on the second end 8 side, there is a -(N-0.5) turn shift region where the first wire 3 and the second wire 4 are shifted by (N-0.5) turns in the opposite shift direction to the shift direction in the +0.5 shift region 37, specifically, a -1.5 turn shift region 38.

[0056] Therefore, the influence of the stray capacitance occurring between the first wire 3 and the second wire 4 can be reduced, and in the case of a common mode choke coil, for example, the mode conversion characteristics can be reduced.

[0057] Furthermore, in the third portion, the second wire 4 is wound so as to form a third layer, so that the space for winding the wire on the circumferential surface of the winding core portion 5 can be saved.

[0058] In addition, there is no need to provide a relatively wide transition region between the first and fifth portions, such as the transition region 59 shown in Fig. 11. Therefore, the limited dimension of the winding core 5 in the axial direction 6 can be used efficiently.

[0059] In this embodiment, further (6) a sixth portion (turns T18-20) connected to the fifth portion, passing over turns T16-T18 of the first wire 3 of the first layer, and then fitting into recesses formed between adjacent turns of the first wire 3 of the first layer, and wound from the first end 7 to the second end 8 in a state of constituting a second layer on the outer circumferential side of the first layer; (7) a step-down portion 36 that is connected to the sixth portion and is wound so as to be in contact with the circumferential surface of the winding core portion 5 while being adjacent to the second end portion 8 side of the final turn of the first wire 3 of the first layer; It has.

[0060] In the sixth portion, a +0.5 offset region 39 is again formed. This +0.5 offset region 39 also contributes to reducing the influence of stray capacitance occurring between the first wire 3 and the second wire 4.

[0061] Furthermore, the stepped portion 36 contributes to stabilizing the wound state of the second wire 4, and acts to make it difficult for the second wire 4 to become misaligned.

[0062] 2, the second portion 34 of the second wire 4 is positioned along a surface other than the lower surface 29 and the top surface 30 of the winding core portion 5, specifically, along the first side surface 31. Such an arrangement of the second portion 34 provides the following advantages.

[0063] At the location where the second portion 34 of the second wire 4 is located, there is the aforementioned (2) second portion 34 (turn T9 → T10) that is returned from the end of the first portion on the second end 8 side to the first end 7 side and led to the outer periphery of the second layer, and (4) fourth portion 35 (turn T11 → T12) that is led from the end of the third portion on the second end 8 side to the position of the second layer on the outer periphery of the first layer, resulting in a location where the four wires are approximately lined up in a direction perpendicular to the circumferential surface of the winding core portion 5, and the degree of bulging in the direction perpendicular to the circumferential surface of the winding core portion 5 is maximized.

[0064] If the portion where the degree of bulging is greatest were to be positioned along the bottom surface 29 of the winding core part 5, the second wire 4 would come into contact with or be extremely close to the mounting board, which could result in electrical inconvenience. Also, if the portion where the degree of bulging is greatest were to be positioned along the top surface 30 of the winding core part 5, the second wire 4 could come into contact with the top plate 27 or be crushed by the top plate 27.

[0065] In contrast, if the portion with the greatest degree of bulging is located on a surface other than the bottom surface 29 and top surface 30 of the winding core portion 5, specifically, along the first side surface 31 or the second side surface 32, the above-mentioned inconvenience can be avoided. Note that the reason why the surface on which the portion with the greatest degree of bulging is located is a surface other than the bottom surface 29 and top surface 30 of the winding core portion 5 is that the cross section of the winding core portion may be polygonal, such as a hexagon, circular, or elliptical, other than a square, in which case it may be difficult to specify the "side surface."

[0066] Hereinafter, second to eighth embodiments of the present invention will be described with reference to Figures 4 to 10. In Figures 4 to 10, elements corresponding to those shown in Figure 2(A) are given the same reference numerals, and duplicated explanations will be omitted.

[0067] In the second embodiment shown in FIG. 4, (2) in the second portion (turns T9 to T10) that is returned from the end of the first portion on the second end 8 side to the first end 7 side and led to the outer periphery side of the second layer, the return amount is one turn more than in the first embodiment shown in FIG. 2. Also, (3) in the third portion that is wound from the first end 7 toward the second end 8 in a state that constitutes the third layer on the outer periphery side of the second layer, the number of turns of the second wire 4 is one turn more than in the first embodiment shown in FIG. 2. And, (5) in the fifth portion (turns T13 to T17) that is wound from the first end 7 toward the second end 8 in a state that constitutes the second layer, a -2.5 turn shift region 40 is formed in which the first wire 3 and the second wire 4 are shifted by -2.5 turns.

[0068] In the third embodiment shown in FIG. 5, (2) in the second portion (turns T9 to T10) that is returned from the end of the first portion on the second end 8 side to the first end 7 side and led to the outer periphery side of the second layer, the return amount is two turns more than in the first embodiment shown in FIG. 2. Also, (3) in the third portion that is wound from the first end 7 toward the second end 8 in a state that constitutes the third layer on the outer periphery side of the second layer, the number of turns of the second wire 4 is two turns more than in the first embodiment shown in FIG. 2. And, (5) in the fifth portion (turns T14 to T17) that is wound from the first end 7 toward the second end 8 in a state that constitutes the second layer, a -3.5 turn shift region 41 is formed in which the first wire 3 and the second wire 4 are shifted by -3.5 turns.

[0069] The embodiments shown in FIGS. 4 and 5 may be employed for further adjustment of the balance of capacitance occurring between the first wire 3 and the second wire 4.

[0070] The fourth embodiment shown in Fig. 6 is characterized in that, compared to the first embodiment shown in Fig. 2, the turn T1 at the starting end of the second wire 4 is formed as a stepped portion 42. The stepped portion 42 contributes to stabilizing the wound state of the second wire 4 on the first end 7 side, and acts to make it difficult for the second wire 4 to become misaligned.

[0071] 7, the second wire 4 is characterized in that a plurality of sets each consisting of the above-mentioned (1) first portion, (2) second portion, (3) third portion, (4) fourth portion, and (5) fifth portion are arranged along the axial direction 6 of the winding core portion 5. In the region illustrated in FIG. 7, two sets each consisting of the (1) first portion, (2) second portion, (3) third portion, (4) fourth portion, and (5) fifth portion are arranged along the axial direction 6 of the winding core portion 5.

[0072] 7, the multiple (2) second portions and (4) fourth portions of the second wire 4 are arranged at the same positions in the circumferential direction of the winding core 5, for example, at positions along the first side surface 31 (see FIG. 2) of the winding core 5, as can be inferred from FIG. 2. By employing such a configuration, it is possible to make it difficult for the winding state of the wires 3 and 4 to become disordered.

[0073] In the sixth embodiment shown in FIG. 8, similarly to the fifth embodiment shown in FIG. 7, the second wire 4 is arranged in a plurality of sets, each set consisting of (1) a first portion, (2) a second portion, (3) a third portion, (4) a fourth portion, and (5) a fifth portion, along the axial direction 6 of the winding core portion 5. However, in the plurality of third portions constituting the third layer, the second wire 4 is wound around the winding core portion 5 with different numbers of turns in at least two of the plurality of third portions.

[0074] 8, the second wire 4 is wound two turns in the third portion on the left side, and the second wire 4 is wound three turns in the third portion on the right side. As a result, in the fifth portion (turns T8 to T9) wound from the first end 7 to the second end 8 in the state of constituting the second layer (5) on the left side, a -1.5-turn shift region 38 is formed where the first wire 3 and the second wire 4 are shifted by -1.5 turns, and in the fifth portion (turns T19 to T20) wound from the first end 7 to the second end 8 in the state of constituting the second layer (5) on the right side, a -2.5-turn shift region 40 is formed where the first wire 3 and the second wire 4 are shifted by -2.5 turns.

[0075] The embodiments shown in FIGS. 7 and 8 may be employed to further adjust the balance of capacitance occurring between the first wire 3 and the second wire 4.

[0076] 9, the fifth portion (turns T13-T17) is wound from the first end 7 to the second end 8 in a state where it is connected to the fourth portion (turns T10-T12) and fits into a recess formed between adjacent turns of the first wire 3 of the first layer to form a second layer on the outer circumferential side of the first layer, and is wound in a state where it is separated by one turn of the second wire 4 from the first portion (turns T1-T9). Therefore, on the second end 8 side of the boundary between the first portion (turns T1-T9) and the fifth portion (turns T13-T17), there is a -(N-1.5) turn shift region, specifically, a -1.5 shift region 38, which is shifted by 1.5 turns, between the first wire 3 and the second wire 4 in a shift direction opposite to that in the +0.5 shift region 37.

[0077] The eighth embodiment shown in Fig. 10 is characterized in that (3) in the third portion (turns T10-T11) which is connected to the second portion 34 and wound to form a third layer on the outer circumferential side of the second layer, the second wire 4 is wound from the second end 8 toward the first end 7, inversely to the first to sixth embodiments. This configuration can also be applied to the first to seventh embodiments.

[0078] Although the present invention has been described above in relation to the embodiments relating to the coil components constituting the common mode choke coil, the present invention can also be applied to other applications, such as wire-wound chip transformers. Also, the illustrated embodiments are merely illustrative, and partial substitution or combination of configurations is possible between different embodiments.

[0079] The present invention has the following embodiments.

[0080] <1> a core including a winding portion having a first end and a second end opposite to each other in an axial direction; a first wire and a second wire wound helically around the winding core with substantially the same number of turns; Equipped with Among the multiple layers formed by the wire wound around the winding core, the layer closest to the circumferential surface of the winding core is referred to as the first layer, the layer on the outer circumferential side of the first layer is referred to as the second layer, and the layer on the outer circumferential side of the second layer is referred to as the third layer. the first wire includes a portion wound from the first end to the second end in a state constituting a first layer, The second wire is (1) a first portion that is wound from the first end toward the second end in a state where the first portion fits into a recess formed between adjacent turns of the first wire and constitutes a second layer on the outer circumferential side of the first layer; (2) a second portion connected to the first portion, returning from an end of the first portion on the second end side to the first end side, and leading to an outer circumferential side of a second layer; (3) a third portion connected to the second portion and wound in a state of constituting a third layer on the outer circumferential side of the second layer; (4) a fourth portion extending from the third portion to a position of the second layer on the outer circumferential side of the first layer; (5) a fifth portion connected to the fourth portion and wound from the first end toward the second end in a state of constituting a second layer on the outer circumferential side of the first layer while fitting into a recess formed between adjacent turns of the first wire of the first layer; Including, In the third portion, the second wire is wound N turns (N is a natural number equal to or greater than 2); a +0.5 shift region is present on either the first end side or the second end side of the boundary between the first portion and the fifth portion, where the first wire and the second wire are shifted by 0.5 turns; A -(N-0.5) turn shift region is present on either the first end side or the second end side of the boundary between the first portion and the fifth portion, and the first wire and the second wire are shifted by (N-0.5) turns in a direction opposite to the direction of shift in the +0.5 shift region. Coil parts.

[0081] <2> a core including a winding portion having a first end and a second end opposite to each other in an axial direction; a first wire and a second wire wound helically around the winding core with substantially the same number of turns; Equipped with Among the multiple layers formed by the wire wound around the winding core, the layer closest to the circumferential surface of the winding core is referred to as the first layer, the layer on the outer circumferential side of the first layer is referred to as the second layer, and the layer on the outer circumferential side of the second layer is referred to as the third layer. the first wire includes a portion wound from the first end to the second end in a state constituting a first layer, The second wire is (1) a first portion that is wound from the first end toward the second end in a state where the first portion fits into a recess formed between adjacent turns of the first wire and constitutes a second layer on the outer circumferential side of the first layer; (2) a second portion connected to the first portion, returning from an end of the first portion on the second end side to the first end side, and leading to an outer circumferential side of a second layer; (3) a third portion connected to the second portion and wound in a state of constituting a third layer on the outer circumferential side of the second layer; (4) a fourth portion extending from the third portion to a position of the second layer on the outer circumferential side of the first layer; (5) a fifth portion connected to the fourth portion and wound from the first end toward the second end in a state where the fifth portion is connected to the fourth portion and is separated from the first portion by one turn of the second wire and fits into a recess formed between adjacent turns of the first wire in the first layer and constitutes a second layer on the outer circumferential side of the first layer; Including, In the third portion, the second wire is wound N turns (N is a natural number equal to or greater than 2); a +0.5 shift region is present on either the first end side or the second end side of the boundary between the first portion and the fifth portion, where the first wire and the second wire are shifted by 0.5 turns; A -(N-1.5) turn shift region is present on either the first end side or the second end side of the boundary between the first portion and the fifth portion, and the first wire and the second wire are shifted by (N-1.5) turns in a direction opposite to the direction of shift in the +0.5 shift region. Coil parts.

[0082] <3> the core includes a first flange portion and a second flange portion extending from the first end portion and the second end portion of the winding core portion, the first flange portion and the second flange portion each have a bottom surface facing a mounting board side and a top surface facing in a direction opposite to the bottom surface, terminal electrodes to which ends of the first wire and the second wire are connected are provided on the lower surface; The second portion and the fourth portion of the second wire are positioned along a surface of the winding core portion that faces in a direction other than a direction in which the bottom surface and the top surface face. <1> or <2> The coil component according to claim 1.

[0083] <4> The second wire has a stepped portion at an end of at least one of the first portion and the fifth portion, the stepped portion being adjacent to a first layer constituted by the first wire and in contact with a peripheral surface of the winding core portion. <1> Or <3> 2. The coil component according to claim 1 .

[0084] <5> With respect to the second wire, a plurality of sets each including the first portion, the second portion, the third portion, the fourth portion, and the fifth portion are arranged along the axial direction of the winding core portion. <1> Or <4> 2. The coil component according to claim 1 .

[0085] <6> the second portions and the fourth portions of the second wire are arranged at the same positions as each other in the circumferential direction of the winding core portion. <5> The coil component according to claim 1.

[0086] <7> The second wire is wound around the winding core with different numbers of turns in at least two of the third portions. <5> or <6> The coil component according to claim 1. [Explanation of symbols]

[0087] 1 Coil parts 2 cores 3 First Wire 4 Second Wire 5. Winding core 6 Axial direction 7 First end 8 Second end 9 First flange 10 Second flange 11,12 Underside of flange 13,14 Top surface of flange 19,21 First side of flange 20,22 Second side of flange 23~26 terminal electrode 27 Tabletop 29 Underside of core 30 Top surface of the core 31 First side of core 32 Second side of core 34 Part 2 35 Part 4 36,42 Drop part 37,39 +0.5 shift area 38 -1.5 deviation area 40 -2.5 deviation area 41 -3.5 deviation area

Claims

1. a core including a winding portion having a first end and a second end opposite to each other in an axial direction; a first wire and a second wire wound helically around the winding core with substantially the same number of turns; Equipped with Among the multiple layers formed by the wire wound around the winding core, the layer closest to the circumferential surface of the winding core is referred to as a first layer, the layer on the outer circumferential side of the first layer is referred to as a second layer, and the layer on the outer circumferential side of the second layer is referred to as a third layer. the first wire includes a portion wound from the first end to the second end in a state constituting a first layer, The second wire is (1) a first portion that is wound from the first end toward the second end in a state where the first portion fits into a recess formed between adjacent turns of the first wire and constitutes a second layer on the outer circumferential side of the first layer; (2) a second portion connected to the first portion, returning from an end of the first portion on the second end side to the first end side and leading to an outer circumferential side of a second layer; (3) a third portion connected to the second portion and wound in a state of constituting a third layer on the outer circumferential side of the second layer; (4) a fourth portion led from the third portion to a position of the second layer on the outer circumferential side of the first layer; (5) a fifth portion connected to the fourth portion and wound from the first end toward the second end in a state of constituting a second layer on the outer circumferential side of the first layer while fitting into a recess formed between adjacent turns of the first wire of the first layer; Including, In the third portion, the second wire is wound by N turns (N is a natural number equal to or greater than 2); a +0.5 shift region is present on either the first end side or the second end side of the boundary between the first portion and the fifth portion, where the first wire and the second wire are shifted by 0.5 turns; A −(N−0.5) turn shift region is present on either the first end side or the second end side of the boundary between the first portion and the fifth portion, and the first wire and the second wire are shifted by (N−0.5) turns in a direction opposite to the direction of shift in the +0.5 shift region. Coil parts.

2. a core including a winding portion having a first end and a second end opposite to each other in an axial direction; a first wire and a second wire wound helically around the winding core with substantially the same number of turns; Equipped with Among the multiple layers formed by the wire wound around the winding core, the layer closest to the circumferential surface of the winding core is referred to as a first layer, the layer on the outer circumferential side of the first layer is referred to as a second layer, and the layer on the outer circumferential side of the second layer is referred to as a third layer. the first wire includes a portion wound from the first end to the second end in a state constituting a first layer, The second wire is (1) a first portion that is wound from the first end toward the second end in a state where the first portion fits into a recess formed between adjacent turns of the first wire and constitutes a second layer on the outer circumferential side of the first layer; (2) a second portion connected to the first portion, returning from an end of the first portion on the second end side to the first end side and leading to an outer circumferential side of a second layer; (3) a third portion connected to the second portion and wound in a state of constituting a third layer on the outer circumferential side of the second layer; (4) a fourth portion led from the third portion to a position of the second layer on the outer circumferential side of the first layer; (5) a fifth portion connected to the fourth portion, and wound from the first end toward the second end in a state where the fifth portion is separated from the first portion by one turn of the second wire and fits into a recess formed between adjacent turns of the first wire in the first layer, forming a second layer on the outer circumferential side of the first layer; Including, In the third portion, the second wire is wound by N turns (N is a natural number equal to or greater than 2); a +0.5 shift region is present on either the first end side or the second end side of the boundary between the first portion and the fifth portion, where the first wire and the second wire are shifted by 0.5 turns; A −(N−1.5) turn shift region is present on either the first end side or the second end side of the boundary between the first portion and the fifth portion, and the first wire and the second wire are shifted by (N−1.5) turns in a direction opposite to the direction of shift in the +0.5 shift region. Coil parts.

3. the core includes a first flange portion and a second flange portion extending from the first end portion and the second end portion of the winding core portion, the first flange portion and the second flange portion each have a bottom surface facing a mounting board side and a top surface facing in a direction opposite to the bottom surface, terminal electrodes to which ends of the first wire and the second wire are connected are provided on the lower surface; The second portion and the fourth portion of the second wire are positioned along a surface of the winding core portion that faces in a direction other than a direction in which the lower surface and the top surface face. The coil component according to claim 1 .

4. 3. The coil component according to claim 1, wherein the second wire has a stepped-down portion at an end of at least one of the first portion and the fifth portion, the stepped-down portion being adjacent to a first layer constituted by the first wire and in contact with a peripheral surface of the winding core portion.

5. 3. The coil component according to claim 1, wherein a plurality of sets each consisting of the first portion, the second portion, the third portion, the fourth portion, and the fifth portion are arranged for the second wire along an axial direction of the winding core portion.

6. The coil component according to claim 5 , wherein the second portions and the fourth portions of the second wire are arranged at the same positions as each other in a circumferential direction of the winding core portion.

7. The coil component according to claim 5 , wherein the second wire is wound around the winding core portion with different numbers of turns in at least two of the third portions.

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