JP5099166B2 - Coil parts - Google Patents

Description

  The present invention relates to a coil component, and more particularly to a coiled coil component.

  As a coil component, a core having a core part and flanges disposed at both ends of the core part, electrodes disposed on each collar part, wound around the core part, and wound on each electrode What is provided with the wired wire is known (for example, refer patent document 1).

Japanese Patent Laid-Open No. 10-32438

  In recent years, a coil component corresponding to a large current is required as a coil component used in various electronic devices. In order to make a wound-type coil component compatible with a large current, first, it is necessary to reduce the DC resistance of the wire. As a technique for reducing the direct current resistance of the wire, it is conceivable to use a plurality of wires. However, it is difficult to achieve a sufficiently low direct current resistance only by using a plurality of wires, and a further reduction in direct current resistance is desired.

  An object of this invention is to provide the coil components which can further reduce direct-current resistance.

  A coil component according to the present invention is wound around a core having a core part, a collar part disposed at both ends of the core part, an electrode disposed on each collar part, and the core part. A first wire connected to each electrode, and a second wire wound around the core in the same direction as the first wire and connected to each electrode. The connection position of the second wire is located behind the connection position of the first wire in one electrode as viewed in the winding direction of the first and second wires, and the second wire is connected to the first wire in the other electrode. The connection position of the two wires is located in front of the connection position of the first wire in the other electrode when viewed in the winding direction of the first and second wires, The length of the lead-out portion is shorter than the length of the lead-out portion of the first wire.

  In the coil component according to the present invention, since the first and second wires are connected to each electrode, the conductor cross-sectional area is increased and the direct current resistance is reduced. Furthermore, in the present invention, on one electrode side, the connection position of the second wire is located behind the connection position of the first wire as viewed in the winding direction of the first and second wires. In the other electrode, since the connecting position of the second wire is located in front of the connecting position of the first wire in the winding direction, the length of the lead portion of the second wire Is shorter than the length of the lead-out portion of the first wire. For this reason, the conductor length, in particular, the conductor length of the second wire is shortened, and the DC resistance can be further reduced.

  Preferably, the second wire is wound around the outer side of the first wire at the core portion. In this case, the first and second wires are wound without reducing the number of turns (number of turns). As a result, a desired inductance value can be ensured.

  Further, the connecting position of the second wire wound outside the first wire is located on the rear side of one electrode side as viewed in the winding direction from the connecting position of the first wire. On the other electrode side, the lead portion of the first wire and the lead portion of the second wire intersect each other because it is located in front of the connecting position of the first wire in the winding direction. Never do. Therefore, when the second wire is wound, it is possible to prevent the first wire from being tightened and disconnection or the like from occurring in the first wire.

  Preferably, the connecting position of the first wire in each electrode is a region that is located on the rear side when viewed in the winding direction of the first and second wires from the central region of the collar portion to the central region. . In this case, the lengths of the lead portions of the first and second wires are further shortened, and the direct current resistance can be further reduced.

  Preferably, the resin part which covers the part wound by the winding part of the 1st and 2nd wire is further provided. In this case, the first and second wires can be protected by the resin portion.

  The coil component according to the present invention includes a core having a core part and flanges disposed at both ends of the core part, electrodes disposed on the respective collar parts, and the core part in the same direction. A plurality of wires wound and connected to each electrode, and the connection positions of the plurality of wires in each electrode are different for each wire, and the connection positions of the plurality of wires in one electrode The order and the order of the connecting positions of the plurality of wires in the other electrode are reversed when viewed in the winding direction of the first and second wires, and on one electrode side, the connecting position is The length of the lead portion of the wire on the rear side when viewed in the winding direction of the first and second wires is the length of the wire whose connection position is the front side when viewed in the winding direction of the first and second wires. Shorter than the length of the lead-out portion, the connection position is the winding of the first and second wires on the other electrode side The length of the wire drawing portion on the front side when viewed in the direction is shorter than the length of the wire drawing portion on the rear side when the connecting position is seen in the winding direction of the first and second wires And

  In the coil component according to the present invention, since a plurality of wires are connected to each electrode, the conductor cross-sectional area is increased and the direct current resistance is reduced. Further, according to the present invention, the connecting position on one electrode side is the rear side when viewed in the winding direction of the first and second wires, and the connecting position is on the other electrode side of the first and second wires. The wire on the front side when viewed in the winding direction has a shorter conductor length. As a result, the DC resistance can be further reduced.

  Preferably, a plurality of wires are wound in layers at the core portion. In this case, a plurality of wires are wound without reducing the number of turns (number of turns). As a result, a desired inductance value can be ensured.

  Preferably, the connection position on one electrode side is the rear side when viewed in the winding direction of the first and second wires, and the connection position on the other electrode side is the winding direction of the first and second wires. The wire on the front side as viewed in FIG. In this case, the lead portions of the plurality of wires do not intersect each other. Therefore, when winding a plurality of wires in order, it is possible to prevent the previously wound wire from being tightened and the wire from being broken.

  According to the present invention, it is possible to provide a coil component capable of further reducing the direct current resistance.

It is a perspective view which shows the coil components which concern on this embodiment. It is a perspective view which shows the coil components which concern on this embodiment. It is a top view which shows the coil components which concern on this embodiment. It is a figure for demonstrating the cross-sectional structure of the coil components which concern on this embodiment. It is a figure for demonstrating the manufacturing process of the coil components which concern on this embodiment. It is a figure for demonstrating the manufacturing process of the coil components which concern on this embodiment. It is a figure for demonstrating the manufacturing process of the coil components which concern on this embodiment. It is a figure for demonstrating the manufacturing process of the coil components which concern on this embodiment. It is a top view which shows the modification of the coil components which concern on this embodiment. It is a figure for demonstrating the cross-sectional structure of the modification of the coil component which concerns on this embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description, the same reference numerals are used for the same elements or elements having the same function, and redundant description is omitted.

  With reference to FIGS. 1-4, the structure of the coil component which concerns on this embodiment is demonstrated. As shown in FIGS. 1 to 4, the coil component 1 includes a core 10, a first wire 20, a second wire 30, a pair of terminal electrodes 40 and 50, and a resin portion 60. ing. The coil component 1 has a rectangular parallelepiped shape. For example, the length is set to 2.5 mm, the width is set to 1.5 mm, and the height is set to 1.2 mm.

  The core 10 includes a core part 11 and a pair of flange parts 13 and 15 disposed at both ends of the core part 11 in the axial direction. The core 10 is integrally formed with the core part 11 and the flange parts 13 and 15, and is made of, for example, ferrite. The core part 11 has a rectangular parallelepiped shape. Each flange 13 and 15 has a rectangular parallelepiped shape, and includes end faces 13a and 15a and four peripheral side faces 13b to 13e and 15b to 15e, respectively. The end surfaces 13a and 15a are surfaces opposite to the surface on which the core portion 11 of the flange portions 13 and 15 is formed. The peripheral side surfaces 13b to 13e and 15b to 15e are surfaces orthogonal to the end surfaces 13a and 15a. The core 10 has an H shape in a cross section parallel to the axial direction of the core 11.

  The first and second wires 20 and 30 are wound around the core part 11. The 1st and 2nd wires 20 and 30 have electroconductivity, for example, are constituted by insulation coat copper wire. The first wire 20 includes a winding portion 21 wound around the winding core portion 11 and lead portions 23 and 25 extending from the winding portion 21 and connected to the terminal electrodes 40 and 50. ing. The second wire 30 includes a winding part 31 wound around the winding core part 11 and lead parts 33 and 35 extending from the winding part 31 and connected to the terminal electrodes 40 and 50. ing.

  As shown in FIG. 4, the second wire 30 is wound around the outside of the first wire 20 in the core portion 11. Accordingly, the first wire 20 and the second wire 30 are wound around the winding core portion 11 in layers.

  The terminal electrode 40 is disposed on the flange 13. The terminal electrode 50 is disposed on the flange portion 15. The terminal electrodes 40 and 50 include first electrode layers 41 and 51, second electrode layers 43 and 53, and third electrode layers 45 and 55.

  The first electrode layers 41 and 51 are disposed on the end surfaces 13a and 15a and the peripheral side surfaces 13b and 15b so as to cover the end surfaces 13a and 15a and the peripheral side surfaces 13b and 15b of the flanges 13 and 15, respectively. Thus, the first electrode layers 41 and 51 include the portions 41a and 51a disposed on the end surfaces 13a and 15a and the portions 41b and 51b disposed on the peripheral side surfaces 13b and 15b. The first electrode layers 41 and 51 are formed by applying a paste containing a metal powder (eg, Ag powder) as a conductive material and baking the paste.

  The second electrode layers 43 and 53 are disposed on the first electrode layers 41 and 51 so as to cover the first electrode layers 41 and 51. Thus, the second electrode layers 43 and 53 include the portions 43a and 53a disposed on the end surfaces 13a and 15a and the portions 43b and 53b disposed on the peripheral side surfaces 13b and 15b. The second electrode layers 43 and 53 are formed by applying a thermosetting resin containing a metal powder (for example, Ag powder) as a conductive material and curing the resin. The ends of the lead portions 23, 25, 33, 35 of the first and second wires 20, 30, that is, the locations connected to the first electrode layers 41, 51 are the first electrode layers 41, 51 (parts 41a, 51a) and the second electrode layers 43, 53 (parts 43a, 53a). The second electrode layers 43 and 53 are electrically connected to the first electrode layers 41 and 51 by contacting the first electrode layers 41 and 51.

  The third electrode layers 45 and 55 are disposed on the second electrode layers 43 and 53 so as to cover the second electrode layers 43 and 53. Accordingly, the third electrode layers 45 and 55 include portions 45a and 55a disposed on the end surfaces 13a and 15a and portions 45b and 55b disposed on the peripheral side surfaces 13b and 15b. The third electrode layers 45 and 55 are formed by depositing a metal (for example, Ni / Sn) using a plating method (for example, electroplating method). The third electrode layers 45 and 55 are electrically connected to the second electrode layers 43 and 53 by being in contact with the first electrode layers 41 and 51.

  Lead portions 23 and 33 of the first and second wires 20 and 30 are connected to the portion 41b of the first electrode layer 41, and the first and second wires 20 and 30 are connected to the first electrode layer 41 (terminal electrode 40). The second wires 20 and 30 are electrically connected. Lead portions 25 and 35 of the first and second wires 20 and 30 are connected to the portion 51b of the first electrode layer 51, and the first electrode layer 51 (terminal electrode 50) and the first and second wires The second wires 20 and 30 are electrically connected.

  As shown in FIG. 3, on the terminal electrode 40 (first electrode layer 41) side, the connecting position of the second wire 30 (leading portion 33) is the connecting position of the first wire 20 (leading portion 23). The first and second wires 20 and 30 are positioned behind the line position as viewed in the winding direction (arrow WD direction). That is, the connection position of the second wire 30 and the connection position of the first wire 20 are different. The connecting position of the first wire 20 (drawing portion 23) is set in the central region of the peripheral side surface 13b of the flange portion 13. The connection position of the second wire 30 (leading portion 33) is greater than that of the central region of the peripheral side surface 13b (the portion 41b of the first electrode layer 41) of the flange portion 13 and the first and second wires 20, 30. Is set in the rear region as viewed in the winding direction. The length of the lead portion 33 of the second wire 30 is shorter than the length of the lead portion 23 of the first wire 20. In FIG. 3, the illustration of the second electrode layers 43 and 53, the third electrode layers 45 and 55, and the resin portion 60 is omitted for the description of the connection position.

  On the terminal electrode 50 (first electrode layer 51) side, the connecting position of the second wire 30 (leading portion 35) is more than the connecting position of the first wire 20 (leading portion 25). The second wires 20 and 30 are positioned on the front side when viewed in the winding direction (arrow WD direction). That is, the connection position of the second wire 30 and the connection position of the first wire 20 are different. The connecting position of the first wire 20 (leading portion 25) is set in the central region of the peripheral side surface 15b of the flange portion 15 (the portion 51b of the first electrode layer 51). The connecting position of the second wire 30 (the lead-out portion 35) is in a region on the front side as viewed in the winding direction of the first and second wires 20, 30 from the central region of the peripheral side surface 15b of the flange portion 15. Is set. The length of the lead portion 35 of the second wire 30 is shorter than the length of the lead portion 25 of the first wire 20.

  The winding direction of the first and second wires 20 and 30 is the direction indicated by the arrow WD when viewed from the side where the first and second wires 20 and 30 of the core 10 are connected. . When viewed from the side opposite to the side where the first and second wires 20 and 30 of the core 10 are connected, the winding direction of the first and second wires 20 and 30 is indicated by the arrows shown in the figure. The direction is opposite to the WD direction. When viewed from the side opposite to the side where the first and second wires 20, 30 of the core 10 are connected, the connecting position of the second wire 30 on the terminal electrode 40 side is the first position. The wire 20 is located on the front side as viewed in the winding direction of the first and second wires 20 and 30 from the connecting position of the wire 20. Further, on the terminal electrode 50 side, the connecting position of the second wire 30 is rearward of the connecting position of the first wire 20 when viewed in the winding direction of the first and second wires 20 and 30. Is located. Therefore, in any case, the relationship between the connection position of the first wire 20 and the connection position of the second wire 30 is reversed when viewed in the winding direction of the first and second wires 20 and 30. It becomes.

  The resin part 60 is formed so as to cover the wound portions 21 and 31 of the first and second wires 20 and 30. For the resin portion 60, a non-conductive resin (for example, an epoxy resin, a phenol resin, or a silicone resin) kneaded with ferrite powder is used.

  Next, a manufacturing process of the coil component 1 having the above-described configuration will be described with reference to FIGS. 5-8 is a figure for demonstrating the manufacturing process of the coil components based on this embodiment.

  Prior to manufacturing the coil component 1, the core 10 is prepared (see FIG. 5A).

  Next, the first electrode layers 41 and 51 are formed (see FIG. 5B). Here, a conductive paste is prepared, and the conductive paste is applied to the end surfaces 13a and 15a of the flange portions 13 and 15 and the four peripheral side surfaces 13b to 13e and 15b to 15e. Then, the applied conductive paste is baked on the flanges 13 and 15 by heat treatment. Thus, the first electrode layers 41 and 51 are formed on the end surfaces 13a and 15a and the four peripheral side surfaces 13b to 13e and 15b to 15e. As an electrically conductive paste, what mixed the organic powder, the organic solvent, etc. in the metal powder which has Ag particle | grains as a main component can be used.

  Next, insulating coated copper wires as first and second wires 20 and 30 are prepared and wound around the core portion 11 of the core 10. Here, first, the first wire 20 is wound and connected (see FIG. 6A). The connection between the lead portions 23 and 25 of the first wire 20 and the first electrode layers 41 and 51 (portions located on the peripheral side surfaces 13b and 15b) is performed by thermocompression bonding. Instead of thermocompression bonding, the first wire 20 and the first electrode layers 41 and 51 may be connected by ultrasonic welding.

  After the first wire 20 is wound and connected, the second wire 30 is wound and connected (see FIG. 6B). As a result, the second wire 30 is wound around the outside of the first wire 20. The winding direction of the second wire 30 is the same as the winding direction of the first wire 20. The connection between the lead portions 33 and 35 of the second wire 30 and the first electrode layers 41 and 51 is performed by thermocompression bonding. Instead of thermocompression bonding, the second wire 30 and the first electrode layers 41 and 51 may be connected by ultrasonic welding.

  Next, the resin portion 60 is formed (see FIG. 7A). Here, first, a resin material obtained by kneading ferrite powder in a non-conductive resin is prepared. Then, the prepared resin material is molded so as to cover the winding portions 21 and 31 of the first and second wires 20 and 30. Thereby, the resin part 60 will be obtained. The resin portion 60 is not formed on the first electrode layers 41 and 51.

  Next, second electrode layers 43 and 53 are formed (see FIG. 7B). Here, first, a conductive resin is prepared, and ends of the first electrode layers 41 and 51 and the first and second wires 20 and 30 (portions connected to the first electrode layers 41 and 51). Conductive wire resin is applied so as to cover. Then, the applied conductive resin is cured by heat treatment. As the conductive resin, a thermosetting resin mixed with a metal powder (for example, Ag powder) and an organic solvent can be used. Although it does not restrict | limit especially as a thermosetting resin, For example, a phenol resin, an acrylic resin, a silicone resin, an epoxy resin, a polyimide etc. can be used.

  Next, a part of each of the first electrode layers 41 and 51 and the second electrode layers 43 and 53 is removed (see FIG. 8A). Specifically, the remaining portions of the first electrode layers 41 and 51 and the second electrode layers 43 and 53 are removed except for the portions located on the end surfaces 13a and 15a and the peripheral side surfaces 13b and 15b. Thereby, the first electrode layers 41 and 51 including the portions 41a and 51a and the portions 41b and 51b, and the second electrode layers 43 and 53 including the portions 43a and 53a and the portions 43b and 53b, Will be obtained. The removal of the first electrode layers 41 and 51 and the second electrode layers 43 and 53 is performed by, for example, grinding.

  Next, third electrode layers 45 and 55 are formed (see FIG. 8B). The third electrode layers 45 and 55 are formed by depositing metal by electroplating. Thereby, the third electrode layers 45 and 55 including the portions 45a and 55a and the portions 45b and 55b are obtained. Examples of the metal to be deposited include Ni and Sn, Cu and Ni and Sn, Ni and Au, Ni and Pd and Au, Ni and Pd and Ag, Ni and Ag, and the like.

  Through these manufacturing processes, the coil component 1 having the above-described configuration is obtained.

  As described above, in the present embodiment, since the first and second wires 20 and 30 are connected to the terminal electrodes 40 and 50, the conductor cross-sectional area is increased and the DC resistance is reduced.

  In the present embodiment, on the terminal electrode 40 side, the connecting position of the second wire 30 is greater than the connecting position of the first wire 20 in the winding direction of the first and second wires 20 and 30 (arrow WD direction). ) And the terminal electrode 50 side, the connecting position of the second wire 30 is the same as the connecting position of the first wire 20 in the winding direction (arrow WD direction). Is located. That is, the order of the connecting positions of the first and second wires 20 and 30 in the terminal electrode 40 and the order of the first and second wires 20 and 30 in the terminal electrode 50 are the first and second wires. This is the reverse when viewed in the winding direction of 20, 30 (arrow WD direction). For this reason, the lengths of the lead portions 33 and 35 of the second wire 30 are shorter than the lengths of the lead portions 23 and 25 of the first wire 20. As a result, the conductor length, in particular, the conductor length of the second wire 30 is shortened, and the DC resistance can be further reduced.

  In the present embodiment, the second wire 30 is wound around the outside of the first wire 20 in the core portion 11. As a result, the first and second wires 20 and 30 are wound without reducing the number of turns (number of turns). As a result, the coil component 1 can ensure a desired inductance value.

  The connection position of the second wire 30 is located on the rear side of the terminal electrode 40 side as viewed in the winding direction (arrow WD direction) from the connection position of the first wire 20, and on the terminal electrode 50 side. Since it is located on the front side as viewed in the winding direction (arrow WD direction) from the connecting position of the first wire 20, the lead portions 23 and 25 of the first wire 20 and the second wire 30 The drawer portions 33 and 35 do not intersect. Therefore, when the second wire 30 is wound after the first wire 20 is wound, the first wire 20 is pressed by the second wire 30 and the first wire 20 is tightened. There is no. Thereby, it is possible to prevent disconnection or the like in the first wire 20.

  In the present embodiment, the connection position of the first wire 20 in each terminal electrode 40, 50 is the winding of the first and second wires 20, 30 from the central region of the flanges 13, 15 rather than the central region. The region is the rear side when viewed in the direction (arrow WD direction). Thereby, the lengths of the lead portions 23, 25, 33, and 35 of the first and second wires 20 and 30 are further shortened, and the DC resistance can be further reduced.

  In the present embodiment, the coil component 1 includes a resin portion 60 that covers the winding portions 21 and 31 of the first and second wires 20 and 30. For this reason, the resin part 60 can protect the first and second wires 20 and 30.

  The preferred embodiments of the present invention have been described above. However, the present invention is not necessarily limited to the above-described embodiments, and various modifications can be made without departing from the scope of the present invention.

  In the present embodiment, two wires (first and second wires 20 and 30) are wound around the core portion 11 of the core 10, but the number of wires wound is limited to two. I can't. For example, as shown in FIGS. 9 and 10, three wires (first to third wires 20, 30, 70) are wound around the core portion 11 of the core 10, and each terminal electrode 40, 50 is wound. Each of them may be connected to each other. Also, four or more wires may be wound. The third wire 70 is wound around the outer side of the second wire 30 in the core portion 11. The connecting positions of the first to third wires 20, 30, and 70 are different.

  In the terminal electrode 40 (first electrode layer 41), the connecting position of the third wire 70 is wound around the first to third wires 20, 30, 70 rather than the connecting position of the second wire 30. It is located on the rear side when viewed in the turning direction (arrow WD direction). In the terminal electrode 50 (first electrode layer 51), the connecting position of the third wire 70 is more forward than the connecting position of the second wire 30 when viewed in the winding direction (arrow WD direction). positioned. Therefore, the connecting positions of the first to third wires 20, 30, 70 are the winding directions (arrows) of the first to third wires 20, 30, 70 on the terminal electrode 40 side and the terminal electrode 50 side. The direction is reversed when viewed in the WD direction. The lengths of the lead portions 73 and 75 of the third wire 70 are shorter than the lengths of the lead portions 33 and 35 of the second wire 30.

DESCRIPTION OF SYMBOLS 1 ... Coil component, 10 ... Core, 11 ... Core part, 13, 15 ... Gutter part, 20 ... 1st wire, 21 ... Winding part, 23, 25 ... Pull-out part, 30 ... 2nd wire, 31 ... winding part, 33, 35 ... lead-out part, 40, 50 ... terminal electrode, 60 ... resin part, 70 ... third wire, WD ... winding direction of the first to third wires.

Claims (7)

A core having a core part, and flanges disposed at both ends of the core part;
Electrodes disposed on each of the buttocks,
A first wire wound around the core and connected to each of the electrodes;
A second wire wound around the core in the same direction as the first wire and connected to each electrode;
The first wire and the second wire are connected to the same electrode at each end;
The connection position of the second wire in one of the electrodes is more rearward than the connection position of the first wire in one of the electrodes when viewed in the winding direction of the first and second wires Located in
The connection position of the second wire in the other electrode is more forward than the connection position of the first wire in the other electrode when viewed in the winding direction of the first and second wires. Located
The coil component, wherein a length of the lead portion of the second wire is shorter than a length of the lead portion of the first wire.   2. The coil component according to claim 1, wherein the second wire is wound around the outside of the first wire in the core portion.   The connection position of the first wire in each of the electrodes is a region that is located on the rear side when viewed in the winding direction of the first and second wires from the central region of the flange portion to the central region. The coil component according to claim 1 or 2, wherein:   The coil component according to any one of claims 1 to 3, further comprising a resin portion that covers a portion of the first and second wires wound around the winding portion. A core having a core part, and flanges disposed at both ends of the core part;
Electrodes disposed on each of the buttocks,
A plurality of wires wound in the same direction around the core and connected to each of the electrodes; and
The plurality of wires are connected to the same electrode at each end, and the connection position of the plurality of wires in each electrode is different for each wire,
The order of the connecting positions of the plurality of wires in one of the electrodes and the order of the connecting positions of the plurality of wires in the other electrode are reversed when viewed in the winding direction of the plurality of wires. And
In one of the electrode side, the length of the lead portion of the wire connecting wire position is rearward as viewed in the winding direction of the plurality of wires, the winding direction of the connecting wire positions the plurality of wires Shorter than the length of the wire draw-out portion on the front side as seen in FIG.
In other of the electrode side, the length of the lead portion of the wire connecting wire position is the front viewed in the winding direction of the plurality of wires, connecting wire position is in the winding direction of the plurality of wires A coil component characterized by being shorter than the length of the wire drawing portion on the rear side when viewed.   6. The coil component according to claim 5, wherein the plurality of wires are wound in layers in the core portion. The connection position on one electrode side is the rear side when viewed in the winding direction of the plurality of wires, and the connection position on the other electrode side is the front side when viewed in the winding direction of the plurality of wires. The coil component according to claim 6, wherein the wire that is formed is wound outward in the core portion.

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