JP6550779B2 - Winding coil parts - Google Patents

Description

  The present invention relates to wound coil components.

  Conventionally, a wound coil component in which a conductor wire is wound around a core has been used mainly in electronic devices. In recent years, the frequency of electronic devices has been increased, and a wound coil component that can be used in a high frequency band has been demanded. For example, Patent Document 1 discloses a stray capacitance in order to enable use in a high frequency band. Wire-wound coil parts with reduced noise have been proposed. Specifically, in the wound coil component of Patent Document 1, the stray capacitance is reduced by setting the winding pitch to be twice or more the conductor wire diameter.

JP 2008-300471 A

  However, since the winding coil component of Patent Document 1 has a winding pitch that is twice or more the conductor wire diameter, the inductance per unit volume cannot be increased and it is difficult to reduce the size. was there.

  Therefore, an object of the present invention is to provide a wound coil component that can reduce the stray capacitance between conductor wires and that can be miniaturized.

In order to achieve the above object, the wound coil component according to the present invention is:
Conductor wire,
A core portion having a core portion around which the conductor wire is wound, and
The core part has a recess, and a space is formed by the recess between a part of the conductor wire and the surface of the core part.

In the winding coil component according to the present invention, the depth of the recess is preferably 1/2 or more of the diameter of the conductor wire.
In this way, the stray capacitance between the conductor wires can be effectively reduced.

In a certain form of the wound coil component according to the present invention, the core part includes one end face located on the same plane and an electrode provided on the one end face, and the core part is provided at both ends of the core part. 1st and 2nd collar part provided, The said recessed part is provided in the side surface located in the said one end surface side in the said core part.
Thus, by providing the concave portion on the one end face side in the core portion, stray capacitance due to an electromagnetic field in the vicinity of the wire can be suppressed.

In a certain form of the wound coil component according to the present invention, the recess includes a first recess and a second recess.
Thus, by forming a recessed part into 2 or more, the fall of the mechanical strength of the said core part can be suppressed.

In an embodiment of the winding coil component according to the present invention, the winding core portion has opposing first and second side surfaces, the first side surface has the first recess, and the second side surface It has the said 2nd crevice.
By thus dividing the recess into two or more parts and dividing them into the opposing first and second side faces, it is possible to effectively suppress the reduction in mechanical strength of the winding core.

In a form of the wound coil component according to the present invention, the core portion further includes a third side surface having a third recess and a fourth side surface having a fourth recess.
By thus dividing the recess into four or more parts and dividing them into the first to fourth side surfaces, it is possible to more effectively suppress the reduction in mechanical strength of the winding core.

  According to the winding coil component according to the present invention configured as described above, it is possible to provide a winding coil component that can reduce the stray capacitance between conductor wires and can be reduced in size.

It is a perspective view of the winding coil component of Embodiment 1 which concerns on this invention. It is sectional drawing about the AA line of FIG. It is sectional drawing which shows the structure of the core part 20 with which the winding coil component of Embodiment 2 which concerns on this invention was equipped. It is sectional drawing which shows the structure of the core part 30 with which the winding coil component of Embodiment 3 which concerns on this invention was equipped. It is sectional drawing which shows the structure of the core part 40 with which the winding coil component of Embodiment 4 which concerns on this invention was equipped. It is sectional drawing which shows the structure of the core part 50 with which the winding coil component of Embodiment 5 which concerns on this invention was equipped. It is sectional drawing which shows the structure of the core part 60 with which the winding coil component of the modification was provided.

DESCRIPTION OF EMBODIMENTS Hereinafter, a winding coil component according to an embodiment of the present invention will be described with reference to the drawings.
Embodiment 1
FIG. 1 is a perspective view of a wound coil component according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along line AA in FIG.
The winding coil component of Embodiment 1 is
(1) Winding core portion 1, first collar portion 6 provided at one end of winding core portion 1, second collar portion 8 provided at the other end of winding core portion 1, and first collar portion 6 A core portion 10 having a first electrode 7 provided on one end surface and a second electrode 9 provided on one end surface of the second flange 8;
(2) a conductor wire 5 wound around the winding core portion 1 of the core portion 10 and having one end connected to the first electrode 7 and the other end connected to the second electrode 9;
including.
Here, one end surface of the first ridge portion 6 provided with the first electrode 7 and one end surface of the second ridge portion 8 provided with the second electrode 9 are configured to be located on the same plane, For example, the winding coil component is mounted with the first electrode 7 and the second electrode 9 facing the mounting substrate.

Here, in the first embodiment, as described later, the core portion 1 of the core portion 10 has the first concave portion 1a and the second concave portion 2a, and the conductor wire is formed by the first concave portion 1a and the second concave portion 2a. The space formed between the surface 5 and the surface of the winding core 1 keeps the stray capacitance generated between the conductor wires low.
Hereinafter, the configuration of the wound coil component of the first embodiment will be specifically described.

  The core part 1 is formed in a columnar shape having, for example, one end face, the other end face, and first to fourth side faces 11, 12, 13, 14. The first side surface 11 and the second side surface 12 of the winding core portion 1 have one end surface provided with the first electrode 7 of the first flange portion 6 and one end surface provided with the second electrode 9 of the second flange portion 8. It is parallel. The first side surface 11 of the first side surface 11 and the second side surface 12 is provided with one end surface provided with the first electrode 7 of the first collar portion 6 and the second electrode 9 of the second collar portion 8. Located on the end face side. In the 1st side surface 11, the 1st recessed part 1a is formed in the groove shape from the one end surface by the side of the 1st collar part 6 to the other end surface by the side of the 2nd collar part 8, The depth of the 1st recessed part 1a is, for example, It is set to 1/2 or more of the thickness of the core part 1. Similarly, in the second side surface 12 facing the first side surface 11, the second recess 2a is formed in a groove shape extending from one end surface to the other end surface, and the depth of the second recess 2a is the thickness of the core portion 1. It is set to 1/2 or more of. Here, in this specification, the distance between the first side surface 11 and the second side surface 12 is referred to as the thickness of the core portion 1, and the distance between the third side surface 13 and the fourth side surface 14 facing each other is the core portion 1. The width of

The first concave portion 1a is formed in the first side surface 11 in a region between the first side on the third side surface 13 side and the center line of the first side surface 11 parallel to the first side, and the second concave portion 2a The second side surface 12 is formed in a region between the second side on the fourth side surface 14 side and the center line of the second side surface 12 parallel to the second side. Here, in the present specification, the term “central line or central axis” means, unless otherwise stated, a central line or central axis parallel to the first side and the second side. The first concave portion 1a and the second concave portion 2a arranged as described above form the first concave portion 1a in a depth of 1/2 or more of the thickness of the winding core portion 1, and the second concave portion 2a is formed in the winding core portion Even if it is formed to a depth of 1/2 or more of the thickness of 1, the first concave portion 1 a and the second concave portion 2 a are not connected and penetrated in the thickness direction of the winding core portion 1.
Furthermore, the 1st recessed part 1a and the 2nd recessed part 2a are provided in the 2 times symmetrical position and shape centering on the axis | shaft of the core part 1. As shown in FIG. Here, the two-fold symmetry means that it matches the original position and shape when rotated 180 degrees.

  A conductor wire 5 is wound around the core portion 1. At this time, the conductor wire 5 is close to or in contact with the surface of the first side surface 11 excluding the first concave portion 1a of the core portion 1, but the first concave portion 1a is formed in the first portion. A space (cavity) is formed between the conductor wire 5 and the surface of the core portion 1 by the recess 1a. Further, the conductor wire 5 is close to or in contact with the surface of the second side surface 12 excluding the second concave portion 2a of the core portion 1, but the second concave portion is formed in the portion where the second concave portion 2a is formed. A space (cavity) is formed between the conductor wire 5 and the surface of the core part 1 by 2a. In the wound coil component configured as described above, an inductance value corresponding to the shape, size and material of the winding core portion 1 and the number of windings of the conductor wire 5 is obtained, and stray capacitance is generated between the conductor wires 5.

The winding coil component of Embodiment 1 configured as described above can reduce stray capacitance between the conductor wires 5 as compared to the conventional winding coil component for the following reasons.
The capacitance value of the stray capacitance depends on a dielectric (including a space) existing between the conductor wires 5. Specifically, the dielectric surrounding the adjacent conductor wires is a core material in which the upper half is an air space and the lower half is made of ferrite, for example, in any conventional coiled coil component. It is. In this case, since the dielectric constant of the ferrite also varies depending on the composition but is generally in the range of 12 to 16 and the dielectric constant of the air space is 1, the formation of the stray capacitance in the lower half of the core material The contribution is large and the stray capacitance is large.

  On the other hand, in the wound coil component of the first embodiment, in the portion where the first concave portion 1a and the second concave portion 2a are formed, the dielectrics surrounding the adjacent conductor wires 5 are all atmospheric spaces. Therefore, in the portion where the first concave portion 1a and the second concave portion 2a are formed, the contribution of the core material in the formation of the stray capacitance can be reduced, and the stray capacitance can be reduced.

Embodiment 2
FIG. 3 is a cross-sectional view showing the configuration of the core portion 20 of the wound coil component according to the second embodiment of the present invention. The winding coil component of the second embodiment is configured in the same manner as the winding coil component of the first embodiment except that the first recess 1 b is formed only in the first side surface 11 of the winding core portion 1 in the core portion 20. The first recess 1 b is formed on the first side surface 11, for example, from the one end face on the side of the first ridge 6 so that the center line of the opening of the first recess 1 b coincides with the center line of the first side 11. It is formed in the shape of a groove reaching the other end face on the side of the ridge portion 8. The first recess 1 b is formed, for example, at the same depth as the first recess 1 a of the first embodiment and twice the width of the first recess 1 a of the first embodiment.

  In the wound coil component of the second embodiment configured as described above, in the same manner as in the first embodiment, in the portion where the first recess 1b is formed, all of the dielectric surrounding the adjacent conductor wires 5 can be the atmospheric space. Therefore, in the portion where the first recess 1b is formed, the contribution of the core material can be reduced in the formation of the stray capacitance, and the stray capacitance can be reduced.

Embodiment 3
FIG. 4 is a cross-sectional view showing the configuration of the core portion 30 of the wound coil component according to the third embodiment of the present invention. In the wound coil component of the third embodiment, (1) the shape of the first recess 1c formed on the first side surface 11 of the core portion 1 is different from the shape of the first recess 1a of the first embodiment. The shape of the second recess 2c formed on the second side surface 12 is different from the shape of the second recess 2a of the first embodiment. The winding coil component of the third embodiment is configured the same as the winding coil component of the first embodiment except for the above (1) and (2).

The first recess 1c is formed on the first side surface 11 from the one end surface on the first flange 6 side so that the center line of the opening of the first recess 1c coincides with the center line of the first side surface 11, for example. It is formed in the shape of a groove reaching the other end face on the side of the ridge portion 8. Further, the first recess 1 c is formed, for example, at a depth equal to or less than half the thickness of the winding core 1 and wider than the first recess 1 a of the first embodiment.
In addition, the second recess 2 c is provided on the second side 12, for example, from one end face on the side of the first ridge 6 so that the center line of the opening of the second recess 2 c matches the center line of the second side 12. It is formed in the shape of a groove reaching the other end face on the second flange 8 side. The second recess 2c is formed, for example, at a depth that is half or less of the thickness of the core 1 and wider than the second recess 2a of the first embodiment and the same width as the first recess 1c.

  In the wound coil component of the third embodiment configured as described above, in the same manner as in the first embodiment, in the portion where the first recess 1c is formed, all of the dielectric surrounding the adjacent conductor wires 5 can be the atmospheric space. In the portion where the first recess 1c is formed, the contribution of the core material in the formation of the stray capacitance can be reduced, so that the stray capacitance can be reduced. Further, in the portion where the second concave portion 2c is formed, all the dielectric surrounding the adjacent conductor wires 5 can be an atmospheric space, and in the portion where the second concave portion 2c is formed, the contribution of the core material in the formation of the stray capacitance Therefore, stray capacitance can be reduced.

Embodiment 4
FIG. 5 is a cross-sectional view showing the configuration of the core portion 40 of the wound coil component according to the fourth embodiment of the present invention. The winding coil component of the fourth embodiment is configured in the same manner as the winding coil component of the first embodiment except for the following (1) to (4).
(1) The shape of the 1st recessed part 1d formed in the 1st side surface 11 of the core part 1 differs from the shape of the 1st recessed part 1a of Embodiment 1. FIG.
(2) The shape of the second recess 2d formed on the second side surface 12 of the core 1 is different from the shape of the second recess 2a of the first embodiment.
(3) A third recess 3 d is formed on the third side surface 13 of the core 1.
(4) A fourth recess 4 d is formed on the fourth side surface 14 of the core 1.

  Here, the first recess 1 d is formed on the first side surface 11, for example, one end surface on the first flange 6 side so that the center line of the opening of the first recess 1 d coincides with the center line of the first side surface 11. To the other end surface of the second flange 8 side. Further, the first recess 1d is, for example, formed at a depth that is half or less of the thickness of the core portion 1 shallower than the first recess 1c of the third embodiment and wider than the first recess 1c of the third embodiment. Be done.

The second recess 2 d is formed on the second side 12, for example, from the one end face on the side of the first ridge 6 so that the center line of the opening of the second recess 2 d coincides with the center line of the second side 12. It is formed in the shape of a groove reaching the other end face on the side of the ridge portion 8. Further, the second recess 2d is, for example, formed at a depth that is half or less of the thickness of the core 1 shallower than the second recess 2c of the third embodiment and wider than the second recess 2c of the third embodiment. Be done.
The third recess 3 d is formed at the center of the third side surface 13.
The fourth recess 4 d is formed at the center of the fourth side surface 14.

  In the wound coil component of the fourth embodiment configured as described above, between the adjacent conductor wires 5 in the portion where the first recess 1d, the second recess 2d, the third recess 3d, and the fourth recess 4d are formed. The surrounding dielectric can be all the atmospheric space, and the contribution of the core material in the formation of the stray capacitance can be reduced in the portion where the first recess 1d, the second recess 2d, the third recess 3d, and the fourth recess 4d are formed. Thereby, since the contribution of the core material can be reduced in the formation of the stray capacitance, the stray capacitance can be reduced.

Embodiment 6
FIG. 6 is a cross-sectional view showing the configuration of the core portion 50 of the wound coil component according to the fifth embodiment of the present invention. The wound coil component of the fifth embodiment is curved in place of the first recessed portion 1d, the second recessed portion 2d, the third recessed portion 3d, and the fourth recessed portion 4d having a rectangular cross section in the wound coil component of the fifth embodiment. The configuration is the same as that of the winding coil component of the fourth embodiment except that the first concave portion 1e, the second concave portion 2e, the third concave portion 3e, and the fourth concave portion 4e formed by the concave surface are formed.

  In the wound coil component of Embodiment 5 configured as described above, in the portion where the first recess 1e, the second recess 2e, the third recess 3e, and the fourth recess 4e are formed, the gap between the adjacent conductor wires 5 is defined. The surrounding dielectric can be all the atmospheric space, and the contribution of the core material in the formation of the stray capacitance can be reduced in the portion where the first concave portion 1e, the second concave portion 2e, the third concave portion 3e, and the fourth concave portion 4e are formed. Thereby, since the contribution of the core material can be reduced in the formation of the stray capacitance, the stray capacitance can be reduced.

  In the coiled coil components of Embodiments 1 to 5 above, the core portions 10, 20, 30, 40, 50 are made of a magnetic material such as Ni—Zn ferrite, a nonmagnetic material made of an inorganic material such as alumina, a resin, or the like. And can be composed of various materials. The core portions 10, 20, 30, 40, and 50 can be manufactured by various processing methods such as press processing such as multistage press molding and cutting processing such as dicer cutting. Moreover, the core parts 10, 20, 30, 40, 50 can also be produced by laminating a plurality of core sheets and firing a green body in which a recess is formed.

  Moreover, in the coiled coil components of Embodiments 1 to 5, the conductor wire 5 is made of a copper-nickel-plated wire, a wire made of a conductive material such as Cu, Al, Au, or Ag, a polyesterimide copper wire, etc. It can be composed of a magnetic plated wire (containing nickel or iron as a wire and coated with plating).

  In the above Embodiments 1-6, the 1st recessed part and the 2nd recessed part were formed in various depths. However, in the present invention, in order to effectively reduce the stray capacitance, it is preferable that at least the depth of the first recess and the second recess is at least half the diameter of the conductor wire 5.

  In the wound coil components of the first to sixth embodiments described above, a concave portion is formed on at least a part of the outer peripheral side surface of the core portion 1, and all dielectrics surrounding the conductor wires 5 in the concave portion are all the atmospheric space. By doing this, stray capacitance was reduced.

  However, the present invention is not limited to this. For example, as shown in FIG. 7, a cavity extending from one end surface on the first flange portion 6 side to the other end surface on the second flange portion 8 side in the core portion 1. The core part 60 provided with 61 may be used. For example, the cavity 61 is formed so as to penetrate the core portion 1 in the axial direction, but is closed by the first flange portion 6 and the second flange portion 8 and penetrates the entire core portion 1. It is not something to do. Even if it does in this way, compared with the case where there is no cavity 61, concentration of the electric field in the core part 1 can be eased, and stray capacitance can be made small.

DESCRIPTION OF SYMBOLS 1 Core part 1a, 1b, 1c, 1d, 1e 1st recessed part 2a, 2c, 2d, 2e 2nd recessed part 3d, 3e 3rd recessed part 4d, 4e 4th recessed part 5 Conductor wire 6 1st collar part 7 1st electrode 8 Second collar 9 Second electrode 10, 20, 30, 40 Core 11 First side 12 Second side 13 Third side 14 Fourth side 61 Cavity

Claims (4)

Conductor wire,
A core portion having a winding core portion around which the conductor wire is wound;
The winding core has a recess, and a space is formed by the recess between a part of the conductor wire and the surface of the winding core ,
The recess has a first recess and a second recess,
The winding core portion has a first side surface and a second side surface facing each other, the first side surface has the first recess, and the second side surface has the second recess.
In the cross section perpendicular to the direction in which both ends of the core portion are opposed to each other, the first concave portion and the second concave portion do not overlap in the direction in which the first side surface and the second side surface are opposed to each other. Winding coil parts.   The wound coil component according to claim 1, wherein a depth of the concave portion is ½ or more of a diameter of the conductor wire. The core portion has an end surface located on the same plane and an electrode provided on the end surface, and includes first and second ridges provided at both ends of the winding core portion.
The winding coil part according to claim 1 or 2, wherein the concave portion is provided on a side surface of the core portion located on the one end surface side. The winding coil part according to any one of claims 1 to 3, wherein the core portion further includes a third side surface having a third recess and a fourth side surface having a fourth recess.

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