JP6572555B2 - Coil parts - Google Patents

Description

  The present invention relates to a coil component.

  Conventionally, as a coil component, there exists what was described in Unexamined-Japanese-Patent No. 2014-120730 (patent document 1). The coil component includes a core part including both end faces and a peripheral surface between both end faces, a flange provided on both end faces of the core part, and a first wire wound around the peripheral face of the core part. And a second wire. Two-layered wires of a first-layer first wire and a second-layer second wire are wound on both end surfaces of the peripheral surface. That is, the two layers of wires on both ends of the peripheral surface are separated so as to have a space on the center side of the peripheral surface.

JP, 2014-120730, A

  By the way, in the conventional coil component, in winding the wire, the first wire of the first layer is wound around the winding core portion, and then the second wire of the second layer is wound on the first wire. The starting position of the winding of the first wire may vary from product to product due to, for example, variations in winding of the wire by the winding machine.

  In addition, since the two layers of wires on both ends of the core part are separated so as to have a space on the center side, when the first wire is wound around the core part, the turn interval of the first wire is: Widen at the center. Thereafter, when the second wire is wound around the first wire, the first wire is pulled in the traveling direction of the winding of the second wire. At this time, since the turn interval of the first wire is wide on the center side, the first wire is easily broken toward the center side.

  Accordingly, the positional relationship between the first wire of the first layer and the second wire of the second layer is shifted, the electrical symmetry between the first wire and the second wire is lowered, and the mode conversion characteristic is deteriorated. .

  Accordingly, the object of the present invention is to reduce the turbulence of the first wire and the second wire, thereby stabilizing the electrical symmetry between the first wire and the second wire and reducing the variation in characteristics. It is to provide a coil component.

In order to solve the above problems, the coil component of the present invention is:
A core portion including both end faces and a peripheral surface between the both end faces;
Collars provided on the both end faces of the core part;
A first wire and a second wire wound around the peripheral surface of the core portion;
The circumferential surface of the core part is
An inclined surface that is inclined so as to approach the axis of the core portion from the end surface toward the center and whose upper end is connected to the end surface;
Each having two inclined surfaces that are inclined so as to be separated from the axis as they are separated from the end surface, and a protrusion provided on the center side of the peripheral surface,
The first wire is wound as a first layer on both sides of the projection so that the end-most turn is in contact with the inclined surface and the projection-side turn is located on the slope. Turned,
The second wire is wound around the first wire of the first layer on each side of the protrusion.

  According to the coil component of the present invention, the peripheral surface of the winding core portion has an inclined surface that is inclined so as to approach the axis of the winding core portion from the end surface toward the center and whose upper end is connected to the end surface. The most end turn of the first wire of the eye is located in contact with the inclined surface. Therefore, in the winding of the wire, the position of the first wire of the first layer is stabilized because the turn on the most end surface side of the first wire of the first layer is located on the inclined surface.

  In addition, the peripheral surface of the winding core portion has two inclined surfaces that are inclined so as to be separated from the shaft as they are separated from the end surface, and has a protrusion provided on the center side of the peripheral surface. The turn closest to the protrusion of one wire is located on the slope of the protrusion. Therefore, in the winding of the wire, the turn on the most protruding portion side of the first wire of the first layer is located on the slope, so that the first wire receives a force in the end surface direction of the winding core portion, and the second layer When the second wire is wound around the first wire, the first wire in the first layer can be prevented from collapsing in the central direction of the core portion.

  Therefore, in the two-layer wire, the turn on the most end face side of the first wire of the first layer is located on the inclined surface, and the turn on the most projecting part side of the first wire of the first layer is located on the slope of the projection part. Thus, the first wire of the first layer is sandwiched between the inclined surface and the inclined surface and is held in a stable state. Therefore, by reducing the turbulence of the first wire and the second wire, the electrical symmetry between the first wire and the second wire can be stabilized, and variations in characteristics can be reduced.

Preferably, in one embodiment of the coil component,
The peripheral surface is composed of a plurality of surfaces arranged in the circumferential direction,
The inclined surface is provided on one surface of the plurality of surfaces, and extends over the entire circumferential length of the one surface.

  According to the coil component of the embodiment, since the inclined surface extends over the entire circumferential length of one surface of the peripheral surface, the first wire of the first layer is used as the inclined surface in winding the wire. The position of the first wire of the first layer can be more reliably stabilized.

Preferably, in one embodiment of the coil component,
The peripheral surface is composed of a plurality of surfaces arranged in the circumferential direction,
The protrusion is provided on one surface of the plurality of surfaces and extends over the entire circumferential length of the one surface.

  According to the coil component of the above embodiment, the protrusion extends over the entire length in the circumferential direction of one surface of the peripheral surface. Therefore, in winding the wire, the first wire of the first layer is connected to the protrusion of the protrusion. It can be located more reliably on the first slope and the second slope, and the collapse of the first layer of the first wire in the central direction of the core portion can be further suppressed.

Preferably, in one embodiment of the coil component,
The core portion has a convex surface including a top portion provided on the central side of the peripheral surface,
The convex surface is inclined so as to be farther from the axis as the top portion, and the topmost turn of the first wire of the first layer is located on the convex surface.

  According to the coil component of the above-described embodiment, the convex surface of the core portion is inclined so that the top portion is away from the axis of the core portion, and the turn on the most top side of the first wire of the first layer is located on the convex surface. . Therefore, in the winding of the wire, the turn on the most top side of the first wire of the first layer is located on the convex surface, so that the first wire receives a force in the direction opposite to the top (end surface direction of the core portion). Thus, when the second wire of the second layer is wound around the first wire, the first wire of the first layer can be prevented from collapsing in the top direction (the central direction of the core portion). Therefore, the turbulence of the first wire and the second wire can be further reduced.

Preferably, in one embodiment of the coil component,
The peripheral surface is composed of a plurality of surfaces arranged in the circumferential direction,
The convex surface is provided on one surface of the plurality of surfaces, and extends over the entire circumferential length of the one surface.

  According to the coil component of the above embodiment, the convex surface extends over the entire circumferential length of one surface of the peripheral surface. Therefore, in winding the wire, the first wire of the first layer is more reliably formed on the convex surface. Therefore, it is possible to further suppress the collapse of the first wire of the first layer in the top direction.

Preferably, in one embodiment of the coil component,
The collar portion has an end surface opposite to the core portion,
A groove is provided on the end surface of the flange,
An electrode to which the first wire or the second wire is electrically connected is disposed in the groove portion.

  According to the coil component of the above embodiment, since the electrodes to which the first and second wires are electrically connected are arranged in the groove portion of the end surface of the collar portion, the end surface of the collar portion regardless of the thickness of the electrode. The surface accuracy can be increased. Therefore, when the end surface of the collar portion is chucked and the wire is wound by the winding machine, the collar portion can be chucked so as to be in a fixed position regardless of the thickness of the electrode, and the wire is fixed to the core portion. Can be wound into position. As a result, the collapse of the wire can be suppressed.

  According to the coil component of the present invention, the electrical symmetry between the first wire and the second wire can be stabilized and the variation in characteristics can be reduced by reducing the turbulence of the first wire and the second wire. it can.

It is a perspective view which shows the coil components of 1st Embodiment of this invention. It is the simplification figure seen from the bottom face side of coil components. It is a perspective view of a core. It is an expanded sectional view of the inclined surface of a core part. It is explanatory drawing explaining operation | movement of the 1st wire by the plane part of an inclined surface. It is explanatory drawing explaining operation | movement of the 1st wire by the curved surface part of an inclined surface. It is an expanded sectional view of the projection part of a core part. It is explanatory drawing explaining the positional relationship of the 1st slope of a projection part, and a 1st, 2nd wire in case the diameter of a 1st, 2nd wire becomes the minimum. It is explanatory drawing explaining the positional relationship of the 1st slope of a projection part, and a 1st, 2nd wire in case the diameter of a 1st, 2nd wire becomes the largest. It is explanatory drawing explaining the force concerning 2 layers of wires on the 1st slope of a projection part. It is a graph which shows the relationship between the displacement force of the 1st wire of the 1st layer, and the inclination angle of the 1st slope of a projection part. It is explanatory drawing explaining the state which chucked the outer end surface of the 2nd collar part of coil components. It is sectional drawing which shows the coil components of 2nd Embodiment of this invention.

  Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

(First embodiment)
FIG. 1 is a perspective view showing a coil component according to a first embodiment of the present invention. FIG. 2 is a simplified view seen from the bottom side of the coil component. FIG. 3 is a perspective view of the core. As shown in FIGS. 1 to 3, the coil component 1 is a common mode choke coil. The coil component 1 includes a core 10, a top plate 15 attached to the core 10, first and second electrodes 51 and 52 attached to the core 10, and wound around the core 10. The first and second wires 21 and 22 are electrically connected to 52.

  The core 10 includes a pair of first and second flange portions 11 and 12 and a core portion 13 that connects the pair of first and second flange portions 11 and 12. As a material of the core 10, for example, a material having a dielectric constant of 20 or less such as alumina (nonmagnetic material), Ni—Zn ferrite (magnetic material, insulator), or resin is used.

  The bottom surface of the core 10 is a surface that can be mounted on a mounting substrate, and the top surface of the core 10 is a surface opposite to the bottom surface of the core 10. The direction connecting the first and second flange parts 11 and 12 of the core part 13 (the axis L direction of the core part 13) is the X direction, and the direction orthogonal to the X direction on the bottom surface of the core 10 is the Y direction. A direction connecting the bottom surface of the core 10 and the top surface is defined as a Z direction. The Z direction is orthogonal to the X direction and the Y direction. The X direction is the length direction of the coil component 1, the Y direction is the width direction of the coil component 1, and the Z direction is the height direction of the coil component 1.

  The core part 13 includes both end surfaces 131 and 132 and peripheral surfaces 133 to 136 between the both end surfaces 131 and 132. The cross-sectional shape in the YZ plane of the core part 13 is a rectangle. The core portion 13 extends in the axis L direction from the first end surface 131 toward the second end surface 132. The peripheral surface includes a bottom surface 133 on the mounting substrate side, a top surface 134 facing the bottom surface 133 in the Z direction, and first and second side surfaces 135 and 136 located between the bottom surface 133 and the top surface 134. The first side surface 135 and the second side surface 136 oppose each other in the Y direction.

  The first flange portion 11 is connected to the first end surface 131 of the core portion 13. The cross-sectional shape in the YZ plane of the 1st collar part 11 is a rectangle. The first flange 11 includes a bottom surface 111 that can be mounted on the mounting substrate, a top surface 112 that faces the bottom surface 111 in the Z direction, and first and second side surfaces 113 that are positioned between the bottom surface 111 and the top surface 112. 114 and inner and outer end surfaces 115 and 116. The first side surface 113 and the second side surface 114 oppose each other in the Y direction. The inner end surface 115 and the outer end surface 116 face each other in the X direction. The inner end face 115 is located on the core part 13 side. The outer end surface 116 is located on the opposite side to the core portion 13.

  Two groove portions 116 a are provided on the outer end surface 116 of the first flange portion 11. The groove 116 a extends in the Z direction and opens on the bottom surface 111 and the top surface 112. The two groove portions 116a are arranged side by side in the Y direction.

  The second flange portion 12 is connected to the second end surface 132 of the core portion 13. The cross-sectional shape in the YZ plane of the 2nd collar part 12 is a rectangle. Similar to the first collar part 11, the second collar part 12 has a bottom surface 121, a top surface 122, a first side surface 123, a second side surface 124, an inner end surface 125, and an outer end surface 126. The first side surface 135 of the winding core portion 13, the first side surface 113 of the first flange portion 11, and the first side surface 123 of the second flange portion 12 are located on the same side in the Y direction.

  Two groove portions 126 a are provided on the outer end surface 126 of the second flange portion 12. The groove 126a extends in the Z direction and opens to the bottom surface 121 and the top surface 122. The two groove parts 126a are arranged side by side in the Y direction.

  The top plate 15 is attached to the top surface 112 of the first collar part 11 and the top surface 122 of the second collar part 12. The top plate 15 is the same as the material of the core 10. The core 10 and the top plate 15 constitute a closed magnetic circuit.

  Two first electrodes 51 are provided on the first flange 11. The first electrode 51 is attached across the bottom surface 111 and the outer end surface 116. One first electrode 51 is disposed in the groove 116 a on the first side surface 113 side. The other first electrode 51 is disposed in the groove 116a on the second side surface 114 side.

  Two second electrodes 52 are provided on the second flange 12. The second electrode 52 is attached across the bottom surface 121 and the outer end surface 126. One second electrode 52 is disposed in the groove 126a on the first side surface 123 side. The other second electrode 52 is disposed in the groove 126a on the second side surface 124 side.

  The first and second electrodes 51 and 52 are made of a material such as Cu, Ag, or Au, for example. The first and second electrodes 51 and 52 may be configured by, for example, bending a metal plate, or may be configured by attaching a conductive paste by sputtering or plating. The first and second electrodes 51 and 52 are electrically connected to the electrodes of the mounting substrate.

  The first and second wires 21 and 22 are wound around the peripheral surfaces 133 to 136 of the winding core 13 in a coil shape. The first and second wires 21 and 22 have, for example, a conductor such as Cu, Ag, or Au and a film that covers the conductor.

  The first end 21 a of the first wire 21 is electrically connected to the first electrode 51 on the first side surface 113 side of the first flange 11. The second end portion 21 b of the first wire 21 is electrically connected to the second electrode 52 on the first side surface 123 side of the second flange portion 12.

  The first end 22 a of the second wire 22 is electrically connected to the first electrode 51 on the second side surface 114 side of the first flange 11. The second end portion 22 b of the second wire 22 is electrically connected to the second electrode 52 on the second side surface 124 side of the second flange portion 12.

  The first and second wires 21 and 22 are wound around the core portion 13 by so-called layer winding. The first wire 21 is directly wound around the circumferential surface of the core portion 13 to form the first layer, and the second wire 22 is outside the first layer first wire 21 except for a part thereof. The second layer is formed by being wound in layers. The first wire 21 and the second wire 22 have the same number of turns. In this embodiment, there are 12 turns. In FIG. 2, the first wire 21 is indicated by hatching, and the second wire 22 is indicated by white.

  The turn interval of the first wire 21 is narrowed on the both end surfaces 131 and 132 side of the peripheral surface of the core part 13 and wide on the center side of the peripheral surface of the core part 13. The first wire 21 is wound with a space at half the number of turns. That is, the first wire 21 is wound so as to be dense from 1 turn to 6 turns, with a space between 6 turns and 7 turns, and from 7 turns to 12 turns.

  The second wire 22 is wound on the first wire 21 of the first layer from the first turn to the fifth turn, and in the space between the sixth turn and the seventh turn of the first wire 21 from the sixth turn to the seventh turn. It is wound on the first wire 21 of the first layer from 8 turns to 12 turns. At this time, the 6th and 7th turns of the second wire 22 intersect with the 6th and 7th turns of the first wire 21.

  As described above, the two-layered wires 21 and 22 of the first-layer first wire 21 and the second-layer second wire 22 are wound on the both end surfaces 131 and 132 side of the peripheral surface of the core portion 13. The On the center side of the peripheral surface of the core part 13, one layer of the second wire 22 is wound, and the first wire 21 intersects the second wire 22. The intersecting portion 21 c of the first wire 21 with the second wire 22 is located on the bottom surface 111 of the core portion 13.

  The circumferential surface of the winding core portion 13 includes an inclined surface 30 provided on each of the first and second end surfaces 131 and 132 side of the top surface 134 and a protrusion 40 provided on the center side of the first side surface 135. Have. The inclined surface 30 extends over the entire length of the top surface 134 in the Y direction (circumferential direction). The protruding portion 40 extends over the entire length of the first side surface 135 in the Z direction (circumferential direction).

  The inclined surface 30 is inclined so as to approach the axis L of the core portion 13 from the end surfaces 131 and 132 toward the center. The upper end of the inclined surface 30 is connected to the end surfaces 131 and 132. The protrusion 40 has a first inclined surface 41 and a second inclined surface 42 arranged along the axis L of the core part 13. The first slope 41 is disposed on the first end face 131 side, and the second slope 42 is disposed on the second end face 132 side. The first inclined surface 41 and the second inclined surface 42 are inclined so as to be separated from the axis L as they are separated from the end surfaces 131 and 132, respectively. The protrusion 40 has the top 43 between the first slope 41 and the second slope 42, but the top 43 may not be provided.

  The first wire 21 is located on both sides of the protrusion 40 so that the turn closest to the end surfaces 131 and 132 is in contact with the inclined surface 30 and the turn closest to the protrusion 40 is positioned on the slopes 41 and 42. It is wound as a layer. The second wire is wound on the first wire 21 of the first layer on each side of the protrusion 40.

  Specifically, the two layers of wires 21 and 22 are between the inclined surface 30 on the first end surface 131 side and the protruding portion 40, and between the inclined surface 30 on the second end surface 132 side and the protruding portion 40. It is wound around. In the two-layered wires 21 and 22 between the inclined surface 30 on the first end surface 131 side and the protrusion 40, the turn on the most first end surface 131 side of the first wire 21 of the first layer (one turn in FIG. 2) Is located on the inclined surface 30, and the turn (6 turns in FIG. 2) closest to the protrusion 40 of the first wire 21 of the first layer is located on the first inclined surface 41 of the protrusion 40. Similarly, in the two layers of wires 21 and 22 between the inclined surface 30 on the second end surface 132 side and the protrusion 40, the turn on the second end surface 132 side of the first wire 21 of the first layer (in FIG. 2). 12 turns) is located on the inclined surface 30, and the turn (7 turns in FIG. 2) closest to the protrusion 40 of the first wire 21 of the first layer is located on the second slope 42 of the protrusion 40.

  Therefore, in the two layers of wires 21 and 22 between the inclined surface 30 on the first end surface 131 side and the protrusion 40, the first wire 21 of the first layer is sandwiched between the inclined surface 30 and the first inclined surface 41. It is held in a stable state. For this reason, even if the second wire 22 of the second layer is wound on the first wire 21 of the first layer, the collapse of the first wire 21 of the first layer can be suppressed. Similarly, in the two layers of the wires 21 and 22 between the inclined surface 30 on the second end surface 132 side and the protrusion 40, the collapse of the first wire 21 in the first layer can be suppressed.

  As shown in FIGS. 3 and 4, the inclined surface 30 is connected to a horizontal plane 35 parallel to the X direction on the top surface 134. The inclined surface 30 has a flat surface portion 31 connected to the first end surface 131 and a curved surface portion 32 connected between the flat surface portion 31 and the horizontal surface 35. The flat surface portion 31 is inclined with respect to the horizontal surface 35 at a predetermined constant inclination angle α. The curved surface portion 32 has a predetermined radius of curvature. The curved surface portion 32 may be omitted and only the flat surface portion 31 may be omitted, or the flat surface portion 31 may be omitted and only the curved surface portion 32 may be omitted. Further, the flat surface portion 31 may be set to have a plurality of inclination angles, and the curved surface portion 32 may be set to have a plurality of curvature radii.

  The width W in the X direction of the inclined surface 30 has a width that can absorb variations in winding of the wire by the winding machine. Specifically, since the maximum winding variation of the wire by the winding machine is 20 μm, the width W is, for example, 20 μm or more.

  The plane part 31 will be described. As shown in FIG. 5, when the first wire 21 is wound around the core portion 13, even if the first wire 21 contacts above the plane portion 31 as indicated by the phantom line, the plane portion 31 is inclined. Therefore, the first wire 21 slides down the flat portion 31 as indicated by the solid line. The inclination angle α of the plane part 31 is set so that the first wire 21 can slide on the plane part 31 with the friction coefficient between the plane part 31 and the first wire 21 as one element, for example.

  The curved surface portion 32 will be described. As shown in FIG. 6, the radius of curvature of the curved surface portion 32 is smaller than the radius of the first wire 21. Since the radius of the first wire 21 is, for example, 25 μm to 30 μm, the curvature radius of the curved surface portion 32 is, for example, 20 μm. As a result, the first wire 21 contacts the curved surface portion 32 at two points and is positioned on the curved surface portion 32.

  As shown in FIGS. 3 and 7, the length D1 in the X direction of the first slope 41 of the protrusion 40 has a predetermined length. The first inclined surface 41 is inclined at a predetermined inclination angle β1 with respect to a horizontal plane 45 parallel to the X direction on the first side surface 135. Similarly, the length D2 in the X direction of the second inclined surface 42 of the protrusion 40 has a predetermined length. The second slope 42 is inclined with respect to the horizontal plane 45 at a predetermined inclination angle β2.

  The length D1 of the first slope 41 will be described. As shown in FIG. 8A, when the diameters of the first and second wires 21 and 22 are minimized, the central portion 13 side (the top 43 side) of the first wire 21 of the first layer 21 of the two layers of wires 21 and 22. ) Is located on the first slope 41. On the other hand, as shown in FIG. 8B, even when the diameters of the first and second wires 21 and 22 are maximized, the center side of the core portion 13 of the first wire 21 of one layer of the two layers of wires 21 and 22 ( The turn on the top 43 side is located on the first slope 41. 8A and 8B, the first wire 21 is indicated by hatching, and the second wire 22 is indicated by white.

  As described above, the length D1 of the first inclined surface 41 is such that the first wire of the two layers 21 and 22 is the first wire in any one of the cases where the diameters of the first and second wires 21 and 22 are minimum or maximum. The turn on the center side of the core portion 13 of 21 is set so as to be located on the first slope 41. Accordingly, even if the diameters of the wires 21 and 22 vary, the turn on the center side of the core portion 13 of the first wire 21 of the first layer 21 of the two layers of wires 21 and 22 is located on the first inclined surface 41. . Therefore, the first wire 21 of the first layer is positioned on the first inclined surface 41, so that the first wire 21 receives a force in the direction of the end surface of the core portion 13, and causes the second wire 22 of the second layer to move. When winding around the 1st wire 21, it can suppress that the 1st wire 21 of the 1st layer collapses in the central direction (top 43 direction) of core part 13.

  The length D2 of the second slope 42 is the same as the length D1 of the first slope 41. Note that the length D1 of the first slope 41 and the length D2 of the second slope 42 may be different or the same.

  The top 43 is a plane parallel to the horizontal plane 45. In addition, the shape of the top part 43 may not be a straight line but a point or a curve in the XY cross section.

  The protrusion 40 is provided on a surface different from the intersection 21 c (see FIG. 2) of the first wire 21 with the second wire 22. Thereby, it is possible to prevent the intersecting portion 21c from contacting the protruding portion 40. The protrusion 40 is arranged so that the center in the X direction of the protrusion 40 coincides with the YZ cross section that intersects the intersecting portion 21c. Thereby, the two layers of wires 21 and 22 on both ends can be evenly arranged on the first and second inclined surfaces 41 and 42 of the protrusion 40.

  The inclination angle β1 of the first slope 41 will be described. As shown in FIG. 9, the balance of the force applied to the second wire 22 in the second layer is considered. The force that the second wire 22 receives from one first wire 21 is Fa1, the force that the second wire 22 receives from the other first wire 21 is Fa2, and the force that the second wire 22 receives by gravity is Fb.

In the horizontal direction (X direction)
Fa1 × cos (60 ° + β1) = Fa2 × cos (60 ° −β1) Equation 1
Meet. By transforming Equation 1,
Fa1 = Fa2 × cos (60 ° −β1) / cos (60 ° + β1) Equation 2
And

In the vertical direction (Y direction)
Fa1 × sin (60 ° + β1) + Fa2 × sin (60 ° −β1) = Fb Equation 3
Meet.

And substituting Equation 2 into Equation 3,
Fa2 {sin (60 ° + β1) × cos (60 ° −β1) / cos (60 ° + β1) + sin (60 ° −β1)} = Fb Equation 4
It becomes.

If the force that the first wire 21 on the top 43 side tends to shift to the top 43 side is T,
T = Fa2 × cos60 ° Formula 5
It becomes.

となる。 And when substituting equation 4 into equation 5,

It becomes.

  And the graph about Formula 6 is shown in FIG. In FIG. 10, the horizontal axis indicates the tilt angle β1 [deg], and the vertical axis indicates the force T [N]. Let Fb in Equation 6 be 1. As shown in FIG. 10, when the inclination angle β1 is 30 °, the shifting force T is almost zero. The tilt angle β1 at which the shifting force T when the tilt angle β1 is 0 ° is reduced from 30% to 10% is 10 ° to 30 °. Therefore, when the inclination angle β1 is 10 ° to 30 °, a shift of the first wire 21 toward the top 43 can be suppressed.

  As described above, the inclination angle β1 of the first slope 41 is set to an angle that can suppress the displacement of the first wire 21 on the top 43 side toward the top 43 side. Accordingly, the first wire 21 of the first layer of the two layers of wires 21 and 22 has the inclination angle β1 of the first inclined surface 41 set to a predetermined set value, so that the center direction ( It is possible to suppress collapse in the direction of the top 43).

  The inclination angle β2 of the second inclined surface 42 is the same as the inclination angle β1 of the first inclined surface 41. In addition, the inclination angle β1 of the first inclined surface 41 and the inclination angle β2 of the second inclined surface 42 may be different or the same.

  According to the coil component 1, the peripheral surface of the core portion 13 is inclined so as to approach the axis L of the core portion 13 from the end surfaces 131 and 132 toward the center, and the inclined surface 30 whose upper end is connected to the end surface. The first wire 21 of the first layer has the most end turns on the side of the end surfaces 131 and 132 in contact with the inclined surface 30. Therefore, when the wires 21 and 22 are wound, the position of the first layer 21 of the first layer 21 is positioned on the inclined surface 30 so that the position of the first layer 21 of the first layer 21 is stable. To do.

  Further, the circumferential surface of the winding core portion 13 has two inclined surfaces 41 and 42 that are inclined so as to be separated from the axis L as they are separated from the end surfaces 131 and 132, respectively, and the protruding portion 40 provided on the center side of the circumferential surface. The turn of the first wire 21 of the first layer closest to the protrusion 40 is located on the inclined surfaces 41 and 42 of the protrusion 40. Therefore, when the wires 21 and 22 are wound, the turn of the first wire 21 of the first layer on the most protruding portion 40 side is located on the inclined surfaces 41 and 42, so that the first wire 21 is the end surface of the core portion 13. When the second wire 22 of the second layer is wound around the first wire 21 in response to the force in the direction of 131, 132, the first wire 21 of the first layer is prevented from collapsing in the central direction of the core part 13. it can.

  Therefore, in the two layers of wires 21 and 22, the most end turns 131 and 132 side turn of the first layer first wire 21 is positioned on the inclined surface 30, and the most protruding portion 40 of the first layer first wire 21 is located. Since the turn is positioned on the slopes 41 and 42 of the protrusion 40, the first wire 21 of the first layer is sandwiched between the slope 30 and the slopes 41 and 42 and is held in a stable state. Therefore, by reducing the turbulence of the first wire 21 and the second wire 22, the electrical symmetry between the first wire 21 and the second wire 22 can be stabilized, and the variation in characteristics can be reduced.

  In addition, since the inclined surface 30 extends over the entire length of the top surface 134 in the Y direction, the first wire 21 of the first layer is more securely attached to the inclined surface 30 when the wires 21 and 22 are wound. The position of the first wire 21 in the first layer can be more reliably stabilized.

  In addition, since the protrusion 40 extends over the entire length of the first side surface 135 in the Z direction, the first wire 21 of the first layer is connected to the first of the protrusion 40 when the wires 21 and 22 are wound. It is possible to more reliably locate the inclined surface 41 and the second inclined surface 42, and to further suppress the collapse of the first wire 21 of the first layer in the central direction of the winding core portion 13.

  In addition, since the first electrode 51 is disposed in the groove portion 116a of the outer end surface 116 of the first flange portion 11, and the second electrode 51 is disposed in the groove portion 126a of the outer end surface 126 of the second flange portion 21, Regardless of the thickness of the first and second electrodes 51, 52, the surface accuracy of the outer end surface 116 of the first flange portion 11 and the surface accuracy of the outer end surface 126 of the second flange portion 21 can be increased.

Therefore, as shown in FIG. 11, the outer end surface 126 of the second flange 12 is chucked by the chuck portion 70, and the core 10 is rotated about the axis L of the core portion 13 by the chuck portion 70. When the wires 21 and 22 are wound by the wire, the second flange portion 12 can be chucked at a fixed position regardless of the thicknesses of the first and second electrodes 51 and 52, and the wires 21 and 22 are fixed to the core portion 13. It can be wound to the position. As a result, collapse of the wires 21 and 22 can be suppressed. (Second Embodiment)
FIG. 12 is a cross-sectional view showing a coil component according to the second embodiment of the present invention. The second embodiment is different from the first embodiment only in the configuration of the top surface of the core part. Only this different configuration will be described below. Note that in the second embodiment, the same reference numerals as those in the first embodiment have the same configurations as those in the first embodiment, and a description thereof will be omitted.

  As shown in FIG. 12, the top surface 134A of the core part 13A of the coil component 1A has a convex surface 60. The convex surface 60 includes a top portion 61 on the center side in the X direction of the top surface 134A (center side of the peripheral surface of the core portion 13A). The convex surface 60 is inclined so that the top portion 61 is separated from the axis L of the core portion 13A. The most apex 61 side turn of the first wire 21 of the first layer of the two layers of wires 21 and 22 (shown in FIG. 2) is located on the convex surface 60. In the XZ cross section, the shape of the convex surface 60 is a straight line, and the shape of the top portion 61 is a point. The shape of the convex surface 60 may be a curve, and the shape of the top portion 61 may be a straight line or a curve.

  Therefore, when the wires 21 and 22 are wound, the first wire 21 is turned in the opposite direction to the top portion 61 (the core portion) because the turn closest to the top portion 61 of the first wire 21 of the first layer is located on the convex surface 60. When the second wire 22 of the second layer is wound around the first wire 21 by receiving a force in the direction of the end surface of 13A), the first wire 21 of the first layer is in the direction of the top 61 (center direction of the core portion 13A). Can be prevented from collapsing. Therefore, the turbulence of the first wire 21 and the second wire 22 can be further reduced.

  Further, the convex surface 60 extends over the entire length of the top surface 134A in the Y direction (circumferential direction). Therefore, in winding the wires 21 and 22, the first wire 21 of the first layer can be positioned more reliably on the convex surface 60, and the collapse of the first layer 21 of the first wire 21 in the direction of the top 61 is further suppressed. can do.

  The present invention is not limited to the above-described embodiment, and the design can be changed without departing from the gist of the present invention.

  In the said embodiment, although the inclined surface has extended over the full length of the circumferential direction of the top | upper surface, you may make it provide in a part of circumferential direction of a top | upper surface. Similarly, the protrusion extends over the entire length of the first side surface in the circumferential direction, but may be provided on a portion of the first side surface in the circumferential direction.

  In the embodiment, the inclined surface is provided on the top surface, but may be provided on another surface in addition to the top surface or instead of the top surface. Similarly, although the protrusion is provided on the first side surface, it may be provided on another surface in addition to the first side surface or instead of the first side surface.

  In the said embodiment, although the inclined surface and the projection part are provided in a different surface, you may make it provide in the same surface.

  In the embodiment, the shape of the YZ cross section of the peripheral surface of the core portion is a quadrangle, but it may be a polygon or a circle other than the quadrangle. In this case, you may provide an inclined surface and a projection part in at least one part of the circumferential direction of a surrounding surface. For example, when the cross-sectional shape of the core portion is a circle, the inclined surface is provided in the range of the central angle from 0 ° to 270 °, and the protruding portion is avoided from the intersection of the first wire and the second wire. The center angle may be provided in the range of 0 ° to 270 °.

  In the said embodiment, although the inclined surface was included in the plane, it is good also as only a curved surface. Although the slope of the protrusion is a flat surface, it may be a curved surface.

  Although the top plate is provided in the embodiment, the top plate may be omitted.

  In the said embodiment, although the groove part was provided in the end surface of a collar part, you may make it abbreviate | omit a groove part.

1, 1A Coil parts 10 Core 11 First flange portion 111 Bottom surface 112 Top surface 113 First side surface 114 Second side surface 115 Inner end surface 116 Outer end surface 116a Groove portion 12 Second flange portion 121 Bottom surface 122 Top surface 123 First side surface 124 Second Side surface 125 Inner end surface 126 Outer end surface 126a Groove portion 13, 13A Core portion 131 First end surface 132 Second end surface 133 Bottom surface 134, 134A Top surface 135 First side surface 136 Second side surface 15 Top plate 21 First wire 22 Second wire 30 Inclined surface 31 Flat surface portion 32 Curved surface portion 40 Projection portion 41 First slope surface 42 Second slope surface 51 First electrode 52 Second electrode 60 Convex surface 61 Top portion L Core axis

Claims (7)

A core portion including both end faces and a peripheral surface between the both end faces;
Collars provided on the both end faces of the core part;
A first wire and a second wire wound around the peripheral surface of the core portion;
The circumferential surface of the core part is
An inclined surface that is inclined so as to approach the axis of the core portion from the end surface toward the center and whose upper end is connected to the end surface;
A protrusion provided on the center side of the peripheral surface of the core portion ,
The protrusion has two inclined surfaces, and the two inclined surfaces are inclined so as to be separated from the axis of the core part as they are separated from the end surface of the core part, respectively.
The first wire is wound as a first layer on both sides of the projection so that the end-most turn is in contact with the inclined surface and the projection-side turn is located on the slope. Turned,
The second wire is a coil component wound around the first wire of the first layer on each side of the protrusion. The peripheral surface is composed of a plurality of surfaces arranged in the circumferential direction,
2. The coil component according to claim 1, wherein the inclined surface is provided on one surface of the plurality of surfaces and extends over the entire circumferential length of the one surface. The peripheral surface is composed of a plurality of surfaces arranged in the circumferential direction,
3. The coil component according to claim 1, wherein the protruding portion is provided on one surface of the plurality of surfaces and extends over the entire circumferential length of the one surface. The core portion has a convex surface including a top portion provided on the central side of the peripheral surface,
The said convex surface inclines so that it may leave | separate from the said axis | shaft as the said top part, The turn of the said top part side of the 1st wire of the 1st layer is located in the said convex surface. The coil component described. The peripheral surface is composed of a plurality of surfaces arranged in the circumferential direction,
5. The coil component according to claim 4, wherein the convex surface is provided on one surface of the plurality of surfaces and extends over the entire circumferential length of the one surface. The collar portion has an end surface opposite to the core portion,
A groove is provided on the end surface of the flange,
The coil component according to any one of claims 1 to 5, wherein an electrode to which the first wire or the second wire is electrically connected is disposed in the groove portion. A core portion including both end faces and a peripheral surface between the both end faces;
Collars provided on the both end faces of the core part;
A first wire and a second wire wound around the peripheral surface of the core portion;
The circumferential surface of the core part is
An inclined surface that is inclined so as to approach the axis of the core portion from the end surface toward the center and whose upper end is connected to the end surface;
Each having two inclined surfaces that are inclined so as to be separated from the axis as they are separated from the end surface, and a protrusion provided on the center side of the peripheral surface,
The peripheral surface includes a plurality of surfaces, and the inclined surface and the protrusion are provided on different surfaces of the peripheral surface,
The first wire is wound as a first layer on both sides of the projection so that the end-most turn is in contact with the inclined surface and the projection-side turn is located on the slope. Turned,
The second wire is a coil component wound around the first wire of the first layer on each side of the protrusion.

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