JP2019220665A - Coil component - Google Patents

Abstract

To provide a coil component capable of being mounted such that wires wound around a winding core part and a mounting substrate do not directly face each other and capable of obtaining high inductance.SOLUTION: A coil component includes: a drum-shaped magnetic core 10 around which wires W1, W2 are wound; plate-like magnetic cores 20, 30 sandwiching the magnetic core 10 from a z direction; and terminal electrodes E1, E2 connected respectively to one ends of the wires W1, W2 and terminal electrodes E3, E4 connected respectively to the other ends of the wires W1, W2. A winding core part 13 of the magnetic core 10 has a surface positioned on one side in a y direction and a surface positioned on the other side in the y direction. The terminal electrodes E1-E4 are arranged in an x direction along the surface as viewed from the z direction.EFFECT: Reliability can be enhanced by mounting such that the magnetic core 20 is interposed between the mounting substrate and the winding core part. Further, magnetic resistance in a closed magnetic path is low, so that high inductance can be obtained.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a coil component, and more particularly, to a coil component that functions as a noise filter.

  As a coil component that functions as a noise filter, the coil components described in Patent Documents 1 and 2 are known.

  The coil component described in Patent Literature 1 has a plate-shaped magnetic core around which two wires are wound, and an E-shaped magnetic core adhered to the plate-shaped magnetic core. By removing the insulating coating, the end of the wire itself is used as a terminal electrode.

  The coil component described in Patent Literature 2 has a drum-shaped magnetic core having a core wound with two wires and a pair of flanges, and a C-shaped magnetic core covering the core from three directions. And one end of the two wires is connected to a terminal electrode provided on the first flange, and the other end of the two wires is a terminal electrode provided on the second flange. Has a configuration connected to the

  However, the coil component described in Patent Document 1 has a configuration in which most of the wires are exposed, and thus it is difficult to ensure high reliability.

  Further, in the coil component described in Patent Literature 2, since the wire wound around the core portion and the mounting board directly face each other, there is a problem that the reliability in this portion is reduced. Further, since two terminal electrodes provided on one flange portion are on the input side and two terminal electrodes provided on the other flange portion are on the output side, the extending direction of the signal wiring coincides with the coil axis. Needed to be implemented.

  On the other hand, in the coil component described in Patent Literature 3, since the plate-shaped magnetic core is disposed below the drum-shaped magnetic core, the wire wound around the core and the mounting substrate are directly connected to each other. There is no facing.

JP 2007-165407 A JP 2008-10578 A JP 2010-10354 A

  However, in the coil component described in Patent Document 3, a plurality of openings are formed in a flange of a drum-shaped magnetic core, and the wires are connected to the terminal electrodes by passing the wires through the openings. Here, since the opening provided in the flange portion of the magnetic core is wide in the direction orthogonal to the direction in which the magnetic flux flows, a large amount of magnetic flux is divided and the magnetic resistance increases, and as a result, the inductance decreases. There was a problem.

  Therefore, an object of the present invention is to provide a coil component that can be mounted without directly facing a wire wound around a core portion and a mounting substrate, and that can obtain high inductance.

  A coil component according to the present invention includes a core having a first direction as an axial direction, a first flange provided at one end of the core in the first direction, and a first direction of the core. A first magnetic core having a second flange provided at the other end of the first magnetic core; and a second magnetic core covering the first magnetic core from one side in a third direction orthogonal to the first direction. A first and a second wire wound around a core portion of the first magnetic core, a first and a second terminal electrode connected to one ends of the first and the second wires, respectively, And third and fourth terminal electrodes respectively connected to the other end of the second wire, and the core of the first magnetic core is arranged in a second direction orthogonal to the first and third directions. And a second surface located on the other side in the second direction. The first and second terminal electrodes , Arranged in a first direction along a first surface as viewed from a third direction, and the third and fourth terminal electrodes are arranged along a first surface along a second surface as viewed from a third direction. It is characterized by being arranged in the direction.

  According to the present invention, reliability can be improved by mounting the second magnetic core so as to be interposed between the mounting substrate and the core. Moreover, one end of the two wires is arranged in a first direction along the first surface, and the other end of the two wires is arranged in a first direction along the second surface. Therefore, it is not necessary to provide an opening in the flange portion of the first magnetic core, so that a high inductance can be obtained.

  In the present invention, the second magnetic core has an upper surface covering the first magnetic core, and a lower surface located on the opposite side of the upper surface, and the first to fourth terminal electrodes are provided on the lower surface of the second magnetic core. It may be provided so as to cover. According to this, it is possible to mount the second magnetic core between the mounting substrate and the core.

  The coil component according to the present invention may further include a plate-shaped member that covers the first magnetic core from the other side in the third direction. According to this, since the core portion is covered from the upper and lower directions, the reliability can be further improved. Further, in the mounting step, the plate-like member can be sucked by using the picking tool, so that the handling of the coil component becomes easy.

  The plate-shaped member may constitute the third magnetic core. According to this, it is possible to further increase the inductance of the coil component. In this case, the first and second flange portions of the first magnetic core and the third magnetic core may be bonded to each other via an adhesive containing a magnetic material. According to this, since the magnetic resistance decreases, it is possible to further increase the inductance of the coil component. Alternatively, the plate member may be made of a non-magnetic material. According to this, by using a thin plate-shaped member, the height of the coil component can be further reduced.

  In the present invention, the first to fourth terminal electrodes may be provided so as to cover the plate member. According to this, mounting can be performed such that the plate-shaped member is interposed between the mounting substrate and the core.

  In the present invention, the core portion of the first magnetic core has a first winding region located on the first flange portion side as viewed from the center in the first direction, and a first winding region as viewed from the center in the first direction. A second coiled region located on the second flange side, wherein the first coil is wound around the first coiled region, and the second coil is wound around the second coiled region. It does not matter. According to this, it is possible to more accurately match the lengths of the first coil and the second coil.

  In the present invention, the core of the first magnetic core may have a projection provided at a position overlapping the center in the first direction. According to this, the degree of coupling in the differential mode between the first coil and the second coil can be adjusted by the height of the protrusion.

  In the present invention, the first and second flange portions of the first magnetic core and the second magnetic core may be bonded to each other via an adhesive containing a magnetic material. According to this, since the magnetic resistance decreases, it is possible to further increase the inductance of the coil component.

  In the present invention, the first and second wires are rectangular wires, and the first to fourth terminal electrodes are end portions of the first and second wires bent from the third direction to the second direction. It may be composed of According to this, it is not necessary to separately provide a terminal electrode.

  As described above, according to the present invention, it is possible to provide a coil component that can be mounted without directly facing the wire wound around the core portion and the mounting board, and that can obtain high inductance. It becomes.

FIG. 1 is a schematic perspective view showing the appearance of a coil component 1 according to a first embodiment of the present invention. FIG. 2 is a schematic exploded perspective view of the coil component 1. FIG. 3 is a schematic perspective view showing the appearance of the first magnetic core 10. As shown in FIG. FIG. 4 is a schematic diagram for explaining an example of a winding pattern of the wires W1 and W2. FIG. 5 is a schematic diagram for explaining another example of the winding pattern of the wires W1 and W2. FIG. 6 is a schematic plan view showing a state where the coil component 1 is mounted on the mounting board 8. FIG. 7 is a schematic perspective view showing the appearance of a magnetic core 10A according to a first modification. FIG. 8 is a schematic diagram for explaining the flow of magnetic flux generated when common mode noise is applied to the wires W1 and W2, and shows a case where the magnetic core 10A according to the first modification is used. . FIG. 9 is a schematic diagram for explaining the flow of magnetic flux generated when differential mode noise is applied to the wires W1 and W2, and shows a case where the magnetic core 10A according to the first modification is used. . FIG. 10 is a schematic perspective view showing the appearance of a magnetic core 10B according to a second modification. FIG. 11 is a schematic perspective view showing the appearance of a magnetic core 10C according to a third modification. FIG. 12 is a schematic perspective view showing the appearance of a magnetic core 10D according to a fourth modification. FIG. 13 is a schematic xz sectional view showing an example in which protrusions 25 and 35 are provided on the second and third magnetic cores 20 and 30, respectively. FIG. 14 is a schematic exploded perspective view illustrating the structure of a coil component 1A according to a modification. FIG. 15A is a schematic diagram illustrating a winding pattern of the wires W1 and W2 in the coil component 1, and FIG. 15B is a schematic diagram illustrating a winding pattern of the wires W1 and W2 in the coil component 1A. FIG. 16 is a schematic exploded perspective view for explaining the structure of the coil component 2 according to the second embodiment of the present invention. FIG. 17 is a schematic xz sectional view of the coil component 2. FIG. 18 is a bottom view showing a first layout of the terminal electrodes E1 to E4. FIG. 19 is a bottom view showing a second layout of the terminal electrodes E1 to E4. FIG. 20 is a bottom view showing a third layout of the terminal electrodes E1 to E4. FIG. 21 is a schematic perspective view showing the appearance of the coil component 3 according to the third embodiment of the present invention.

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

<First embodiment>
FIG. 1 is a schematic perspective view showing the appearance of a coil component 1 according to a first embodiment of the present invention. FIG. 2 is a schematic exploded perspective view of the coil component 1.

  The coil component 1 according to the present embodiment is a coil component that is preferably used as a common mode filter or a coupling inductor for a power supply. As shown in FIGS. 1 and 2, a first magnetic core 10 of a drum type is used. A second magnetic core 20 that covers the first magnetic core 10 from below, a plate-shaped third magnetic core 30 that covers the first magnetic core 10 from above, and a pair of wires W1 and W2. ing.

  A pair of wires W1 and W2 are wound around the first magnetic core 10 of a drum type so that the coil axis direction is the x direction. One ends of the wires W1 and W2 are connected to terminal electrodes E1 and E2, respectively, and the other ends of the wires W1 and W2 are connected to terminal electrodes E3 and E4, respectively. The second magnetic core 20 is a plate-like member that covers the first magnetic core 10 from one side in the z direction, and the third magnetic core 30 is a plate member that covers the first magnetic core 10 on the other side in the z direction. It is a plate-shaped member that covers from. As a result, the first magnetic core 10 is sandwiched between the second magnetic core 20 and the third magnetic core 30 from above and below. As a material of the first magnetic core 10, the second magnetic core 20, and the third magnetic core 30, a magnetic material having high magnetic permeability such as ferrite is used.

  The shape of the first magnetic core 10 of a drum type is shown in FIG. As shown in FIG. 3, the first magnetic core 10 includes a core 13 having an axial direction x, a first flange 11 provided at one end of the core 13 in the x direction, And a second flange portion 12 provided at the other end of the core portion 13 in the x direction.

  The first flange 11 has an inner surface 11i connected to the core 13, an outer surface 11o located on the opposite side of the inner surface 11i, and four side surfaces 11a to 11d. Among them, the inner side surface 11i and the outer side surface 11o form a yz plane, the side surfaces 11a and 11b form an yz plane, and the side surfaces 11c and 11d form an xy plane. Similarly, the second flange portion 12 has an inner surface 12i connected to the core 13, an outer surface 12o located on the opposite side of the inner surface 12i, and four side surfaces 12a to 12d. Among them, the inner side surface 12i and the outer side surface 12o form a yz plane, the side surfaces 12a and 12b form an yz plane, and the side surfaces 12c and 12d form an xy plane.

  The core part 13 includes a first surface 13a that forms an xz plane and faces in the same direction as the side surfaces 11a and 12a, a second surface 13b that forms an xz surface and faces in the same direction as the side surfaces 11b and 12b, and an xy surface And has a third surface 13c facing in the same direction as the side surfaces 11c and 12c, and a fourth surface 13d forming an xy surface and facing in the same direction as the side surfaces 11d and 12d.

  The second magnetic core 20 has an upper surface 21 that covers the first magnetic core 10, a lower surface 22 located on the opposite side of the upper surface 21, and first and second side surfaces 23, 24 located on opposite sides of each other. are doing. The third magnetic core 30 has a lower surface 31 covering the first magnetic core 10 and an upper surface 32 located on the opposite side of the lower surface 31.

  When the first magnetic core 10 is sandwiched between the second and third magnetic cores 20 and 30, the side surfaces 11 c and 12 c of the first and second flange portions 11 and 12 face the upper surface 21 of the second magnetic core 20. The side surfaces 11 d and 12 d of the first and second flange portions 11 and 12 face the lower surface 31 of the third magnetic core 30. Thus, the portion of the wires W1 and W2 wound around the surface 13c of the core 13 is covered with the second magnetic core 20, and the wire W1 and W2 is wound around the surface 13d of the core 13 of the wires W1 and W2. The covered portion is covered with the third magnetic core 30. On the other hand, portions of the wires W1 and W2 that are wound around the surfaces 13a and 13b of the core 13 are exposed without being covered by the second or third magnetic cores 20 and 30.

  At least a part of the portion where the first magnetic core 10 and the second or third magnetic cores 20 and 30 face each other is provided with an adhesive, whereby the first magnetic core 10 and the second and third magnetic cores are provided. 20 and 30 are fixed. In the example shown in FIG. 2, the first and second flanges 11 and 12 and the third magnetic core 30 are bonded via an adhesive 51, and the first and second flanges 11 and 12 are bonded via an adhesive 52. , 12 and the second magnetic core 20 are adhered. In addition, if an adhesive containing a magnetic material is used, the magnetic resistance between the first magnetic core 10 and the second and third magnetic cores 20 and 30 decreases, so that the inductance of the coil component 1 can be increased. Becomes possible.

  The terminal electrodes E1 and E2 include a portion disposed on the upper surface 21 of the second magnetic core 20, a portion disposed on the first side surface 23 of the second magnetic core 20, and a lower surface of the second magnetic core 20. 22, and are arranged in the x direction along the surface 13 c of the core 13. One end of each of the wires W1 and W2 is connected to a portion of the terminal electrodes E1 and E2 arranged on the upper surface 21 of the second magnetic core 20. Similarly, the terminal electrodes E3 and E4 include a portion disposed on the upper surface 21 of the second magnetic core 20, a portion disposed on the second side surface 24 of the second magnetic core 20, and a second magnetic core 20. 20 has a portion arranged on the lower surface 22 and is arranged in the x direction along the surface 13 d of the core 13. The other ends of the wires W1 and W2 are connected to portions of the terminal electrodes E3 and E4 which are arranged on the upper surface 21 of the second magnetic core 20. The terminal electrodes E1 to E4 may be made of terminal fittings adhered to the second magnetic core 20, or may be made of a conductive paste baked on the surface of the second magnetic core 20. No problem.

  FIG. 4 is a schematic diagram for explaining an example of a winding pattern of the wires W1 and W2.

  In the example shown in FIG. 4, the winding direction from the one end W1a of the wire W1 to the other end W1b is the same as the winding direction from the one end W2a of the wire W2 to the other end W2b, and therefore, from the one end W1a of the wire W1. The direction of the magnetic flux generated when a current flows toward the other end W1b is the same as the direction of the magnetic flux generated when a current flows from one end W2a of the wire W2 to the other end W2b. Here, one end W1a and the other end W1b of the wire W1 are connected to terminal electrodes E1 and E2, respectively, and one end W2a and the other end W2b of the wire W2 are connected to terminal electrodes E3 and E4, respectively. Thus, the coil component 1 according to the present embodiment functions as a common mode filter having the terminal electrodes E1 and E2 as a pair of input terminals and the terminal electrodes E3 and E4 as a pair of output terminals.

  In the example shown in FIG. 4, one ends W1a and W2a of the wires W1 and W2 are located on the second flange portion 12 side, and the other ends W1b and W2b of the wires W1 and W2 are located on the first flange portion 11 side. However, the winding pattern of the wires W1 and W2 is not limited to this. For example, as shown in FIG. 5, one end W1a of the wire W1 and the other end W2b of the wire W2 are located on the second flange portion 12, and the other end W1b of the wire W1 and one end W2a of the wire W2 are connected to the first flange. The wires W1 and W2 may be wound so as to be located on the part 11 side. That is, the direction of the magnetic flux generated when the current flows from one end W1a of the wire W1 to the other end W1b, and the direction of the magnetic flux generated when the current flows from the one end W2a of the wire W2 to the other end W2b. If they are the same, any winding method may be used. For example, instead of winding the wire W1 on the first flange portion 11 side and the wire W2 on the second flange portion 12 side, the wires W1 and W2 may be wound by bifilar. And the wires W1 and W2 may be overlapped and wound so that the wire W2 forms the second layer. When the wires W1 and W2 are wound by bifilar, they may be wound with a space between adjacent wires.

  In the winding pattern shown in FIG. 4, the pattern shape of the wire W1 is the same as the pattern shape of the wire W2. In the winding pattern shown in FIG. 5, the pattern shape of the wire W1 and the pattern shape of the wire W2 are symmetric. Become. As a result, since there is almost no characteristic difference between the wire W1 and the wire W2, even if the mounting direction on the mounting substrate is rotated by 180 ° about the z-axis, the characteristics do not change. That is, it is possible to provide a coil component having no directivity.

  FIG. 6 is a schematic plan view showing a state where the coil component 1 according to the present embodiment is mounted on the mounting board 8.

  As shown in FIG. 6, a pair of power lines L1 and L2 and a pair of power lines L3 and L4 are formed on the mounting board 8. One pair of power supply lines is a power supply line to which a reference potential (for example, a ground potential) is applied, and the other is a power supply line to which a power supply potential is applied. Then, the coil component 1 according to the present embodiment is mounted on the mounting board 8 so that the terminal electrodes E1 to E4 and the power supply lines L1 to L4 are respectively connected. Accordingly, load currents in opposite directions flow between the terminal electrodes E1 and E3 and between the terminal electrodes E2 and E4. Then, for example, common mode noise superimposed on the pair of power lines L1 and L2 is removed by the coil component 1, and the power voltage from which the common mode noise has been removed is output from the pair of power lines L3 and L4. As is clear from FIG. 6, in the coil component 1 according to the present embodiment, the coil axis (x direction) is perpendicular to the extending direction (y direction) of the power supply lines L1 to L4.

  FIG. 7 is a schematic perspective view showing the appearance of a magnetic core 10A according to a first modification.

  The magnetic core 10A shown in FIG. 7 is different from the magnetic core 10 shown in FIG. 3 in that a flange-shaped projection 14 is provided at a position overlapping the center of the core 13 in the x direction. The core 13 is divided into a first winding area 13A located on the first flange 11 side and a second winding area 13B located on the second flange 12 side with the projection 14 as a boundary. Divided. Then, the first wire W1 is wound around the first winding area 13A, and the second wire W2 is wound around the second winding area 13B.

  FIG. 8 is a schematic diagram for explaining the flow of magnetic flux generated when common mode noise is applied to the wires W1 and W2, and shows a case where the magnetic core 10A according to the first modification is used. .

  As shown in FIG. 8, when common mode noise is applied to the wires W1 and W2, a magnetic flux φ1 is generated from each portion of the wires W1 and W2 according to the right-hand screw rule. Thereby, the magnetic flux φ2 flows through the closed magnetic path formed by the first magnetic core 10A, the second magnetic core 20, and the third magnetic core 30. Here, since the wire W1 and the wire W2 are wound in the same direction, the magnetic flux φ2 generated by the wire W1 and the magnetic flux φ2 generated by the wire W2 reinforce each other. Thereby, a high impedance is obtained for the common mode component of the current flowing through the wires W1 and W2.

  The magnetic flux φ1 generated from each portion of the wires W1 and W2 mainly flows through the core 13 of the first magnetic core 10A, but the magnetic flux φ1 of the core 13 and the second magnetic core 20 or the third magnetic core 30 When the gap G1 between them is narrow, a part of the magnetic flux φ1 also flows to the second magnetic core 20 or the third magnetic core 30, whereby the magnetic flux φ2 flowing to the closed magnetic circuit is strengthened. For this reason, it is possible to further increase the impedance with respect to the common mode component by reducing the gap G1.

  FIG. 9 is a schematic diagram for explaining the flow of magnetic flux generated when differential mode noise is applied to the wires W1 and W2, and shows a case where the magnetic core 10A according to the first modification is used. .

  As shown in FIG. 9, when differential mode noise is applied to the wires W1 and W2, a magnetic flux φ1 is generated from each portion of the wires W1 and W2 according to the right-hand screw rule. Thus, the magnetic flux φ3 flows through the magnetic path formed by the first magnetic core 10A, the second magnetic core 20, and the third magnetic core 30. The magnetic flux φ3 passes through a protrusion 14 provided on the core 13. Here, since the magnetic flux φ3 generated by the wire W1 and the magnetic flux φ3 generated by the wire W2 flow in the same direction in the protrusion 14, the magnetic flux φ3 contributes to the impedance with respect to the differential mode component of the current flowing through the wires W1 and W2. I do. That is, by providing the projections 14 on the core 13, it is also possible to remove differential mode noise superimposed on the power supply line.

  The impedance with respect to the differential mode component can be adjusted by the gap G2 between the protrusion 14 and the second magnetic core 20 and the third magnetic core 30. That is, by changing the height of the protrusion 14, the impedance with respect to the differential mode component can be adjusted.

  Here, the load current flowing through the power supply lines L1 to L4 also includes a differential mode component, but the load current flowing through the power supply lines L1 to L4 is DC or very low frequency. The coil component 1 according to the present embodiment has a sufficiently low impedance with respect to the DC or very low frequency differential mode component, so that the flow of the load current is not hindered by the coil component 1. When the coil component 1 according to the present embodiment is used as a coupling inductor, the load current flowing through the power supply lines L1 to L4 includes a common mode component, but the coil component 1 according to the present embodiment has a DC or very low frequency. Since the impedance with respect to the common mode component is sufficiently low, the flow of the load current is not hindered by the coil component 1.

  In the example shown in FIG. 7, the projections 14 are provided over the entire circumference of the core 13, but like the magnetic core 10 </ b> B according to the second modification shown in FIG. The protrusions 14 may be provided only on the surface 13d, or the protrusions 14 may be provided on the surfaces 13c and 13d of the core 13 like the magnetic core 10C according to the third modification shown in FIG. . Thus, the impedance with respect to the differential mode component can be adjusted also by changing the number and the position of the protrusions 14.

  Further, like the magnetic core 10D according to the fourth modification shown in FIG. 12, the height H1 of the projection 14 on the surface 13d of the core 13 is set higher than the height H2 of the projection 14 on the surface 13c. No problem. That is, the height of the projection 14 does not need to be constant.

  Further, even when the magnetic core 10 having no protrusion 14 shown in FIG. 3 is used, as shown in FIG. 13, the second and third magnetic cores 20 and 30 have protrusions 25 and If the core 13 and the second and third magnetic cores 20 and 30 are brought close to each other in this portion, a path through which the magnetic flux φ3 flows is formed, so that impedance for the differential mode component can be obtained. It is possible. The core 13 having no projection 14 is suitable for winding the wires W1 and W2 by bifilar or for winding the wires W1 and W2 in an overlapping manner.

  As described above, the coil component 1 according to the present embodiment has a small magnetic resistance because the first magnetic core 10 is sandwiched between the plate-shaped second and third magnetic cores 20 and 30 in the vertical direction. A closed magnetic circuit is formed. This makes it possible to obtain a high impedance for the common mode component. In addition, since it is not necessary to form an opening for passing the wires W1 and W2 in the first magnetic core 10, it is possible to prevent an increase in magnetic resistance due to the formation of the opening in the first magnetic core 10. Becomes possible.

  Further, in the coil component 1, portions of the wires W1 and W2 that are wound around the surfaces 13c and 13d of the core portion 13 are covered with the second magnetic core 20 and the third magnetic core 30 without being exposed. Therefore, it is possible to improve the reliability of the product. Further, since each of the magnetic cores 10, 20, 30 has a simple shape, the manufacturing process does not become complicated. In particular, since the second magnetic core 20 and the third magnetic core 30 are simple plate-shaped members, their manufacture is very easy. For this reason, manufacturing costs can be reduced.

  In the present embodiment, the third magnetic core 30 is used as the plate-shaped member, but a non-magnetic material such as a resin may be used as the material of the plate-shaped member. In this case, as compared with the case where the third magnetic core 30 is used as the plate-shaped member, the inductance is reduced and the magnetic flux leakage to the outside is increased. However, when a non-magnetic material is used, the thickness of the plate-shaped member can be further reduced, so that the height of the coil component can be further reduced while enabling the plate-shaped member to be attracted using a picking tool in a mounting process. It becomes possible. Further, if a composite material in which magnetic powder is mixed with resin is used as the plate-like member, it is possible to reduce the inductance and to suppress the leakage magnetic flux to the outside while realizing a low profile.

  FIG. 14 is a schematic exploded perspective view illustrating the structure of a coil component 1A according to a modification.

  The coil component 1A shown in FIG. 14 differs from the coil component 1 according to the above embodiment in the winding directions of the wires W1 and W2 wound around the magnetic core 10. That is, in the coil component 1 according to the above embodiment, the wires W1 and W2 are wound counterclockwise (counterclockwise) from the one ends W1a and W2a toward the other ends W1b and W2b. In the coil component 1A shown, wires W1 and W2 are wound clockwise (clockwise) from one ends W1a and W2a to the other ends W1b and W2b. As a result, in the coil component 1 according to the above embodiment, the number of turns of the wires W1 and W2 is N + 0.25 turns (N is an integer) as shown in FIG. In 1A, as shown in FIG. 15B, the number of turns of the wires W1 and W2 is N + 0.75 turns (N is an integer). Thereby, the number of turns is increased by 0.5 turns as compared with the coil component 1 according to the above-described embodiment, so that a larger inductance can be obtained.

<Second embodiment>
FIG. 16 is a schematic exploded perspective view for explaining the structure of the coil component 2 according to the second embodiment of the present invention.

  As shown in FIG. 16, the coil component 2 according to the second embodiment is different from the coil component 2 in that flat wires W1 and W2 having a flat cross section are used and terminal electrodes E1 to E4 are omitted. This is different from the coil component 1 according to the first embodiment. Since other basic configurations are the same as those of the coil component 1 according to the first embodiment, the same components are denoted by the same reference numerals, and redundant description will be omitted.

  In the present embodiment, the ends of the flat wires W1 and W2 are bent, and this portion is used as it is as a terminal electrode. That is, one end of each of the wires W1 and W2 extends in the z direction along the first side surface 23 of the second magnetic core 20, and is then bent in the y direction along the lower surface 22 of the second magnetic core 20. . Similarly, the other ends of the wires W1 and W2 extend in the z direction along the second side surface 24 of the second magnetic core 20, and then extend in the y direction along the lower surface 22 of the second magnetic core 20. Bendable. Accordingly, four terminal electrodes E1 to E4 each including one end and the other end of the wires W1 and W2 are formed on the lower surface 22 of the second magnetic core 20, and the terminal electrodes E1 to E4 are formed by terminal fittings or the like. Can be mounted on the mounting substrate 8 shown in FIG.

  In addition, as shown in FIG. 17 which is an xz cross-sectional view of the coil component 2, the wires W1 and W2 may be wound around the core 13 in a multiplex manner. The positions of the ends (terminal electrodes E1 to E4) of the wires W1 and W2 serving as the terminal electrodes change according to the winding pattern of the wires W1 and W2. For example, when the wires W1 and W2 are wound around the core portion 13 in a single layer and the winding pattern shown in FIG. 4 is used, the layout shown in the bottom view of FIG. When a single layer is wound around the core 13 and the winding pattern shown in FIG. 5 is used, the layout shown in the bottom view in FIG. 19 is obtained. In this case, directionality occurs in appearance, but by optimizing (eg, increasing the size) of the land pattern on the mounting board 8, it is possible to eliminate the actual directionality.

  When the wires W1 and W2 are wound around the core 13 in two layers as shown in FIG. 17, the positions of the ends (terminal electrodes E1 to E4) of the wires W1 and W2 are set to the layout shown in FIG. It is possible. In this case, the directionality of the product can be eliminated in appearance.

<Third embodiment>
FIG. 21 is a schematic perspective view showing the appearance of the coil component 3 according to the third embodiment of the present invention.

  As shown in FIG. 21, the coil component 3 according to the third embodiment is different from the coil component 3 according to the second embodiment in that the ends of the flat wires W1 and W2 are bent toward the third magnetic core 30. It is different from part 2. Since other basic configurations are the same as those of the coil component 2 according to the second embodiment, the same components are denoted by the same reference numerals, and redundant description will be omitted.

  In the coil component 3 according to the present embodiment, the terminal electrodes E1 to E4, which are the ends of the wires W1 and W2, are provided on the third magnetic core 30 side. 2 is mounted on the mounting board 8 by being turned upside down by 180 °. As exemplified in the present embodiment, the vertical direction of the coil component according to the present invention is not particularly limited.

  As described above, the preferred embodiments of the present invention have been described. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention. It goes without saying that they are included in the range.

1-3, 1A Coil component 8 Mounting board 10, 10A-10D First magnetic core 11 First flange 12 Second flange 11a-11d, 12a-12d Side surface 11i, 12i Inner surface 11o, 12o Outer surface 13 core portion 13A first winding region 13B second winding region 13a first surface 13b second surface 13c third surface 13d fourth surface 14 protrusion 20 second magnetic core 21 upper surface 22 Lower surface 23 First side surface 24 Second side surface 25, 35 Projection 30 Third magnetic core 31 Lower surface 32 Upper surface 51, 52 Adhesives E1 to E4 Terminal electrodes G1, G2 Gap L1 to L4 Power supply line W1, W2 Wire W1a , W2a One end W1b, W2b The other end φ1 to φ3 Magnetic flux

Claims (11)

A core having an axial direction in a first direction, a first flange provided at one end of the core in the first direction, and another end of the core in the first direction; A first magnetic core having a second flange provided on the first magnetic core;
A second magnetic core that covers the first magnetic core from one side in a third direction orthogonal to the first direction;
First and second wires wound around the core portion of the first magnetic core;
First and second terminal electrodes respectively connected to one ends of the first and second wires;
And third and fourth terminal electrodes connected to the other ends of the first and second wires, respectively.
The core portion of the first magnetic core has a first surface located on one side in a second direction orthogonal to the first and third directions, and a first surface located on the other side in the second direction. Having a second surface,
The first and second terminal electrodes are arranged in the first direction along the first surface when viewed from the third direction;
A coil component, wherein the third and fourth terminal electrodes are arranged in the first direction along the second surface when viewed from the third direction. The second magnetic core has an upper surface that covers the first magnetic core, and a lower surface that is located on a side opposite to the upper surface,
The coil component according to claim 1, wherein the first to fourth terminal electrodes are provided so as to cover the lower surface of the second magnetic core.   The coil component according to claim 1, further comprising a plate-shaped member that covers the first magnetic core from the other side in the third direction.   The coil component according to claim 3, wherein the plate-like member constitutes a third magnetic core.   The first and second flange portions of the first magnetic core and the third magnetic core are bonded to each other via an adhesive containing a magnetic material. Coil parts.   The coil component according to claim 3, wherein the plate member is made of a non-magnetic material.   The coil component according to any one of claims 3 to 6, wherein the first to fourth terminal electrodes are provided so as to cover the plate-shaped member. The winding core portion of the first magnetic core has a first winding region located on the first flange portion side as viewed from a center in the first direction, and a first winding region from the center in the first direction. And a second winding region located on the second flange portion side when viewed.
8. The method according to claim 1, wherein the first coil is wound around the first winding area, and the second coil is wound around the second winding area. A coil component according to claim 1.   9. The coil component according to claim 8, wherein the core portion of the first magnetic core has a projection provided at a position overlapping the center in the first direction.   The first and second flange portions of the first magnetic core and the second magnetic core are bonded to each other via an adhesive containing a magnetic material. The coil component according to any one of the above.   The first and second wires are rectangular wires, and the first to fourth terminal electrodes are ends of the first and second wires bent from the third direction to the second direction. The coil component according to any one of claims 1 to 10, comprising a part.

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