JP2010187006A - Method of manufacturing coil component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a coil component, which can improve DC superposition characteristics while excellently maintaining inductance characteristics. <P>SOLUTION: A core 2 is prepared which has a core portion 12 and a pair of flange portions 14, 15 arranged at both ends of the core portion 12. A second coating portion 10 is formed of a nonmagnetic material so as to cover the entire surface of one flange portion 14 between the pair of flange portions 14, 15 which faces the other flange portion 15. After the second coating portion 10 is formed of the nonmagnetic material, winding 4 is wound around the core portion 12 in contact with the core portion 12. After the winding 4 is wound, a first coating portion 8 is formed of a resin cured body containing a magnetic material in a region sandwiched between the pair of flange portions 14, 15 so as to cover the winding 4 and so as to be interposed between the other flange portion 15 out of the pair of flange portions 14, 15, and the second coating portion 10 made of the nonmagnetic material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a coil component, and more particularly to a wire-wound coil component.

  As this type of coil component, a core (a so-called drum core) having a core part and a pair of flanges disposed at both ends of the core part, a winding wound around the core part, A magnetic powder containing exterior resin filled in a space between a pair of collars while covering a winding between the pair of collars is known (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2005-210055

  In the coil component described in Patent Document 1, the magnetic flux generated by the coil formed by winding the winding around the core part, from the core part, one flange part, magnetic powder-containing exterior resin, A magnetic path that passes through the other flange and returns to the core is formed. Since the magnetic powder-containing exterior resin is in contact with the pair of flanges, the magnetic path thus configured is a closed magnetic path that passes through the portion having magnetism. By configuring the closed magnetic circuit in this way, magnetic flux leaking from the magnetic path (leakage magnetic flux) can be suppressed and good inductance characteristics can be obtained. Problem arises.

  An object of the present invention is to provide a coil component capable of improving the DC superposition characteristics while maintaining good inductance characteristics.

  The coil component according to the present invention is wound so as to be in contact with the core portion having a core portion, a core having a pair of flange portions disposed at both ends of the core portion, and sandwiched between the pair of flange portions. A winding disposed in the region, and a covering portion disposed in a region sandwiched between the pair of flanges so as to cover the winding, and the covering portion is a cured resin containing a magnetic material And a second covering portion made of a nonmagnetic material and interposed between at least one of the pair of flange portions and the first covering portion. Features.

  In the coil component according to the present invention, the magnetic flux generated by the coil formed by winding the winding around the winding core portion passes through the first covering portion between the pair of flange portions. Good inductance characteristics can be obtained by suppressing the magnetic flux small.

  In the present invention, since the second covering portion is interposed between at least one of the pair of flange portions and the first covering portion, the one flange portion and the first covering portion are provided. And will not touch. As a result, a magnetic gap is formed by the second covering portion, magnetic saturation is unlikely to occur, and direct current superimposition characteristics are improved.

  Preferably, the 1st covering part is arranged so that winding may be covered, and the 2nd covering part covers the field opposite to the other collar part of at least one collar part among a pair of collar parts. Are arranged as follows.

  By the way, when forming the 1st coating | coated part arrange | positioned so that a coil | winding may be covered, the resin composition containing a magnetic material is supplied to the area | region pinched | interposed into a pair of ridges so that a coil | winding may be covered, and the said resin Although the composition will be cured, a part of the supplied resin composition may pass through the gap between the windings and reach the part overlapping the windings on the mutually opposing surfaces of the pair of flanges. There is. As described above, when the resin composition containing the magnetic material reaches the portion overlapping the windings on the mutually opposing surfaces of the pair of flanges and is cured while attached to the portion, the cured resin contains the magnetic material. For this reason, a closed magnetic circuit is formed, and the DC superimposition characteristics are deteriorated.

  However, a part of the resin composition containing the magnetic material is formed by arranging the second covering portion so as to cover the surface of the pair of flange portions facing the other flange portion of at least one flange portion. Even if it enters through the gap between the windings, it does not reach and adhere to the surface of the pair of flanges facing the other flange of at least one of the flanges. As a result, it is possible to reliably improve the DC superimposition characteristics.

  More preferably, the 2nd coating | coated part is arrange | positioned so that the surrounding side surface of at least one collar part may be further covered among a pair of collar parts. When supplying a resin composition containing a magnetic material as described above, a part of the resin composition overflows from a region sandwiched between a pair of flanges and is cured in a state of being attached to the peripheral side surface of the flanges. Since the cured resin contains a magnetic material, a closed magnetic circuit is formed, and the direct current superposition characteristics are deteriorated. However, the second covering portion is disposed so as to further cover the peripheral side surface of at least one of the pair of flanges, so that a part of the resin composition containing the magnetic material is paired with the pair of flanges. Even if it overflows from the region sandwiched between the two, it does not adhere to the peripheral side surface of at least one of the pair of hooks. As a result, it is possible to reliably improve the DC superimposition characteristics.

  Preferably, the 1st covering part is arranged so that winding may be covered, and the 2nd covering part is arranged so that the mutually opposing surface of a pair of collar parts may be covered. In this case, as described above, even when a part of the resin composition containing the magnetic material enters through the gap between the windings, it does not reach and adhere to the mutually facing surfaces of the pair of flanges. Thus, it is possible to reliably improve the DC superimposition characteristics. Moreover, since the mutually opposing surface of a pair of collar parts is each covered with a 2nd coating | coated part, DC superimposition characteristic improves further.

  Preferably, the second covering portion is disposed so as to cover a portion of the pair of flange portions exposed from the windings on the mutually facing surfaces and the winding, and the first covering portion includes the second covering portion. It arrange | positions in the area | region enclosed by a coating | coated part. In this case, since the second covering portion is disposed so as to cover the winding and the portion exposed from the winding on the mutually opposing surfaces of the pair of flange portions, when forming the first covering portion In addition, a part of the resin composition containing the magnetic material does not enter through the gap between the windings. Therefore, the direct current superimposition characteristics can be reliably improved without reaching and adhering to the mutually opposing surfaces of the pair of flanges.

  More preferably, the 2nd coating | coated part is arrange | positioned so that the surrounding side surface of a pair of collar part may be covered further. In this case, as described above, even when a part of the resin composition containing the magnetic material overflows from the region sandwiched between the pair of collars, the resin composition does not adhere to the peripheral side surfaces of the pair of collars. As a result, it is possible to reliably improve the DC superimposition characteristics.

  Preferably, the second covering portion is made of a cured resin as the nonmagnetic material. In this case, the second covering portion can be easily formed.

  ADVANTAGE OF THE INVENTION According to this invention, the coil component which can aim at the improvement of a DC superimposition characteristic can be provided, maintaining an inductance characteristic favorably.

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 figure which shows typically the cross-sectional structure which follows the III-III direction of the coil components shown in FIG. It is a perspective view which shows a coil component in the 1st modification of this embodiment. It is a perspective view which shows a coil component in the 1st modification of this embodiment. It is a figure which shows typically the cross-sectional structure in alignment with the VI-VI direction of the coil components shown in FIG. It is a perspective view which shows a coil component in the 2nd modification of this embodiment. It is a perspective view which shows a coil component in the 2nd modification of this embodiment. It is a figure which shows typically the cross-sectional structure in alignment with the IX-IX direction of the coil components shown in FIG.

  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.

  1 and 2 are perspective views showing a coil component according to the present embodiment. FIG. 3 is a diagram schematically showing a cross-sectional structure along the III-III direction of the coil component shown in FIG. 1. As illustrated, the coil component C <b> 1 according to the present embodiment includes a core 2, a winding 4, and a covering portion 7.

  As shown in FIG. 3, the core 2 has a columnar core portion 12 and a pair of flange portions 14 and 15 disposed at both ends of the core portion 12 in the axial direction. Each of the pair of flange portions 14 and 15 has a shape protruding from the core portion 12 in the circumferential direction, and is disposed substantially parallel to each other. Each flange 14 and 15 includes a pair of main surfaces 14a, 14b, 15a and 15b and peripheral side surfaces 14c and 15c. The main surface 14a of the collar part 14 and the main surface 15a of the collar part 15 are opposed to each other. The main surfaces 14 b and 15 b of the flange portions 14 and 15 constitute the outer surface of the core 2.

  The core 2 is made of a magnetic material such as ferrite, for example. In this embodiment, the space | interval (distance represented by L in FIG. 2) between a pair of collar parts 14 and 15 in the core 2 is 0.15-0.80 mm, Preferably it is 0.15-0.60 mm. Is done. The outer dimensions of the flange portions 14 and 15 (for example, the distance between the opposing sides of the flange portions 14 and 15) are preferably 10 mm or less, and usually about 3 mm.

  The winding 4 is wound around the core portion 12 so as to be in contact with the core portion 12 of the core 2, and is accommodated in a region sandwiched between the pair of flange portions 14 in the core 2. It consists of a metal conductor wire (for example, urethane wire) coated with insulation. Copper or the like is used as the metal conductor. The outer diameter of the winding 4 is, for example, about 0.1 mm. The coil 4 is constituted by the winding 4 and the core 2.

  The covering portion 7 is disposed in a region sandwiched between the pair of flange portions 14 and 15 so as to cover the winding 4. The covering portion 7 has a first covering portion 8 and a second covering portion 10.

  The first covering portion 8 is disposed in a region sandwiched between the pair of flange portions 14 and 15 so as to cover the winding 4. That is, the first covering portion 8 is formed so as to sandwich the winding 4 between the core portion 12 and is in contact with the winding 4 to cover the winding 4. The first covering portion 8 is preferably filled in a gap between the windings 4. In this embodiment, the outer peripheral surface of the 1st coating | coated part 8 is the same as the surrounding side surfaces 14c and 15c of each collar part 14 and 15, or is located in the core part 12 side rather than this.

The 1st coating | coated part 8 consists of resin hardened | cured material containing the magnetic material. In this embodiment, the 1st coating | coated part 8 is comprised from resin hardened | cured material and a ferrite. In the 1st coating | coated part 8, content of a ferrite is 20-90 mass% in the total mass of resin hardened | cured material and a ferrite, Preferably it is 70-90 mass%. The density of the 1st coating | coated part 8 is 1.3-2.2 g / cm < ³ >, and it is more preferable in it being 1.8-2.1 g / cm < ³ >. As resin hardened | cured material which comprises the 1st coating | coated part 8, hardened | cured materials, such as an epoxy resin, a phenol resin, a polyurethane resin, or a polyimide resin, are mentioned, for example.

  The 2nd coating | coated part 10 is arrange | positioned so that the main surfaces 14a and 15a and peripheral side surface 14c, 15c which a pair of collar parts 14 and 15 mutually oppose may be covered. Thereby, the second covering portion 10 is interposed between the pair of flange portions 14 and 15 and the first covering portion 8. In this embodiment, the 2nd coating | coated part 10 is formed over the main surfaces 14a and 15a of a pair of collar parts 14 and 15, and the surrounding peripheral surfaces 14c and 15c whole.

  The second covering portion 10 is made of a nonmagnetic material. In this embodiment, the 2nd coating | coated part 10 is comprised from resin hardened | cured material. Examples of the cured resin that forms the second cover 10 include a cured product such as an epoxy resin. The thickness of the 2nd coating | coated part 10 is 15 micrometers, for example.

  As shown in FIGS. 1 and 2, the coil component C <b> 1 further includes a pair of terminal electrodes 16 and 17. The pair of terminal electrodes 16 and 17 are disposed on the flange portion 15 and are provided so as to extend over the main surface 15b and the peripheral side surface 15c of the flange portion 15. Each terminal electrode 16, 17 is connected to the peripheral side surface 15 c of the flange portion 15 via the second covering portion 10. The pair of terminal electrodes 16 and 17 are so-called terminal fittings, and are fixed to the flange portion 15 by adhesion or caulking.

  One end portion (leading portion) of the winding 4 is connected to the terminal electrode 16. The other end portion (leading portion) of the winding 4 is connected to the terminal electrode 17. Each end of the winding 4 is fixed by laser welding, arc welding, or the like in a state where it is entangled with the connecting portion of the corresponding terminal electrode 16, 17. In the coil component C1, the main surface 15b of the flange portion 15 faces a mounting surface such as an external substrate.

  Next, a method for manufacturing the coil component C1 having the above-described configuration will be briefly described.

  First, the core 2 is formed by molding or machining. And resin (for example, epoxy resin etc.) is provided to main surface 14a, 15a and peripheral side surface 14c, 15c of a pair of collar parts 14 and 15 of core 2, and it is made to harden. Thereby, the 2nd coating | coated part 10 will be formed.

  Next, the winding 4 is wound around the core portion 12 of the drum-type core 2. Thereby, the coil part 6 will be formed. The winding 4 may be wound in one direction, or may be wound in an intersecting direction when a plurality of windings 4 are used.

  Next, with respect to the coil part 6, a resin composition is supplied and hardened in the area | region pinched | interposed into a pair of collar parts 14 and 15 so that the coil | winding 4 may be covered. Thereby, the 1st coating | coated part 8 will be formed. Here, the resin composition contains a resin (for example, a thermosetting resin such as an epoxy resin, a phenol resin, a polyurethane resin, or a polyimide resin) and ferrite.

  The ferrite is preferably in the form of powder. And in a resin composition, it is preferable that the ferrite is disperse | distributed substantially uniformly in resin. The suitable average particle diameter of a ferrite is 5-30 micrometers. Suitable ferrites include those having a composition such as Ni—Cu—Zn ferrite.

  Content of the ferrite in a resin composition is 20-90 mass% with respect to the total mass of resin and a ferrite, and it is preferable in it being 70-90 mass%. When the ferrite content is less than 20% by mass, it is difficult to sufficiently obtain the effect of improving the inductance value of the coil component C1 by adding the ferrite. On the other hand, when the ferrite content exceeds 90% by mass, it becomes difficult to supply the resin composition because the viscosity becomes excessively high.

  Next, the terminal electrodes 16 and 17 are attached to the core 2 (the flange portion 15), and the ends of the winding 4 are connected to the terminal electrodes 16 and 17 by welding. Through these processes, the coil component C1 is obtained. The curing method for each resin described above is appropriately selected from heating, light irradiation, and the like according to the selected resin.

  As described above, in the present embodiment, the magnetic flux generated by the coil formed by winding the winding 4 around the core portion 12 is transferred from the core portion 12 to the flange portion 14 and the flange portion 14, for example. A magnetic path returning to the core portion 12 through the arranged second covering portion 10, the first covering portion 8, the second covering portion 10 arranged in the flange portion 15, and the flange portion 15. Constitute. Thus, the magnetic flux generated by the coil formed by winding the winding 4 around the winding core portion 12 passes through the first covering portion 8 between the pair of flange portions 14 and 15. Leakage magnetic flux can be suppressed to be small, and good inductance characteristics can be obtained.

  As described above, the ferrite content in the resin composition in the first covering portion 8 is preferably 70 to 90 mass% with respect to the total mass of the resin composition and ferrite. By setting the content of ferrite in the resin composition to 70 to 90% by mass, the effective magnetic permeability of the entire coil component C1 is increased. Therefore, the number of turns of the winding 4 necessary for the coil component C1 to have a desired inductance value can be reduced, and the resistance (Rdc) of the winding 4 to the direct current can be reduced. Thereby, it is also possible to suppress the conduction loss of the coil component C1.

  In this embodiment, since the 2nd coating | coated part 10 is interposed between a pair of collar parts 14 and 15 and the 1st coating | coated part 8, each collar part 14 and 15 and the 1st coating | coated part 8 Never touches. For this reason, the magnetic path of the magnetic flux generated by the coil formed by winding the winding 4 is an open magnetic path passing through the second covering portion 10. That is, since the second covering portion 10 is interposed between the pair of flange portions 14 and 15 and the first covering portion 8, a magnetic gap is formed by the second covering portion 10. Therefore, in the coil component C1, magnetic saturation is unlikely to occur and the direct current superimposition characteristics are improved.

  In this embodiment, since the main surfaces 14a and 15a of the pair of flange portions 14 and 15 are respectively covered by the second covering portion 10, the direct current superimposition characteristics are further improved.

  In the present embodiment, the second covering portion 10 is not disposed on the core portion 12 of the core 2, and the winding 4 is in contact with the core portion 12. When the 2nd coating | coated part 10 is arrange | positioned at the core part 12, the outer diameter of the core part 12 becomes large by the thickness of the 2nd coating | coated part 10, and the outer side of the coil formed by winding the coil | winding 4 is wound. The diameter also increases, and the volume of the first covering portion 8 decreases accordingly. If the volume of the 1st coating | coated part 8 reduces, it will become difficult to ensure a desired inductance value. Moreover, in order to ensure a desired inductance value, it is necessary to increase the volume of the 1st coating | coated part 8, In this case, the external shape of the coil component C1 will become large. Therefore, it is preferable that the winding 4 is wound so as to be in contact with the core part 12 without arranging the second covering part 10 on the core part 12 of the core 2.

  In this embodiment, the 2nd coating | coated part 10 is formed by apply | coating resin to a pair of collar parts 14 and 15, and hardening it, and consists of a resin cured material. Thereby, the 2nd coating | coated part 10 can be easily formed in a pair of collar parts 14 and 15. FIG.

  By the way, in the manufacturing process of the coil component C <b> 1, when the resin composition described above is supplied into the region sandwiched between the pair of flanges 14 and 15, a part of the resin composition passes through the gap between the windings 4. Infiltrate. However, in this embodiment, since the 2nd coating | coated part 10 is arrange | positioned so that the main surfaces 14a and 15a which a pair of collar parts 14 and 15 mutually oppose may be covered, the resin composition is a pair of collar parts 14. , 15 do not adhere to the mutually opposing main surfaces 14a, 15a. Thereby, in the coil component C1, the direct current superimposition characteristic can be reliably improved.

  In this embodiment, the 2nd coating | coated part 10 is arrange | positioned so that the surrounding side surfaces 14c and 15c of a pair of collar parts 14 and 15 may also be covered. For this reason, when supplying the resin composition in the manufacturing process of the coil component C1, even when a part of the resin composition overflows from a region sandwiched between the pair of flanges 14 and 15, the overflowed resin composition Does not adhere to the peripheral side surfaces 14c, 15c of the pair of flanges 14, 15. Also by this, the direct current superimposition characteristic can be reliably improved in the coil component C1.

  Next, with reference to FIGS. 4-9, the 1st and 2nd modification of the coil component C1 which concerns on this embodiment is demonstrated. 4 and 5 are perspective views showing a coil component in the first modification. 6 is a diagram schematically showing a cross-sectional structure along the VI-VI direction of the coil component shown in FIG. 7 and 8 are perspective views showing a coil component in the second modification. FIG. 9 is a diagram schematically showing a cross-sectional structure along the IX-IX direction of the coil component shown in FIG.

  In the coil component C <b> 2 according to the first modification shown in FIGS. 4 to 6, the second covering portion 10 is disposed only on one of the pair of flange portions 14 and 15. That is, the second covering portion 10 is interposed between the flange portion 14 and the first covering portion 8, and the first covering portion 8 is in contact with the flange portion 15. Also in the 1st modification, the 2nd coating | coated part 10 is formed over the main surface 14a and the surrounding side surface 14c of the collar part 14. FIG.

  In the coil component C <b> 1, a groove 18 extending between the pair of main surfaces 15 a and 15 b is formed on the peripheral side surface 15 c of the flange portion 15. The end of the winding 4 is pulled out to the peripheral side surface 15 c of the flange 15 and is fixed to the flange 15 while being accommodated in the groove 18. The end face (end face of the metal conductor wire) of the winding 4 is exposed to the main surface 15b. The winding 4 and the flange 15 can be easily fixed by using a cement wire as the winding 4.

  As shown in FIGS. 4 and 5, the coil component C <b> 2 further includes a pair of terminal electrodes 26 and 27. The pair of terminal electrodes 26 and 27 are disposed on the flange portion 15 and are provided so as to extend over the main surface 15b and the peripheral side surface 15c of the flange portion 15. The pair of terminal electrodes 26 and 27 are formed by a known plating method. Portions accommodated in the groove 18 and the groove 18 of the winding 4 are covered with terminal electrodes 26 and 27. Therefore, by forming the terminal electrodes 26 and 27 on the main surface 15b and the peripheral side surface 15c of the flange portion 15, the winding 4 and the terminal electrodes 26 and 27 are connected.

  Next, a method for manufacturing the coil component C2 having the above-described configuration will be briefly described.

  First, the core 2 is formed by molding or machining. And resin is provided to the main surface 14a and the peripheral side surface 14c of the collar part 14 of the core 2, and is hardened. Thereby, the 2nd coating | coated part 10 will be formed.

  Next, the winding 4 is wound around the core portion 12 of the core 2. Then, the end of the winding 4 is accommodated in the groove 18 of the flange 15 and fixed to the flange 15.

  Next, with respect to the coil part 6, a resin composition is supplied and hardened in the area | region pinched | interposed into a pair of collar parts 14 and 15 so that the coil | winding 4 may be covered. Thereby, the 1st coating | coated part 8 will be formed. And the terminal electrodes 26 and 27 are formed in the collar part 15 by the plating method. Through these processes, the coil component C2 of the first modified example is obtained.

  As described above, in the first modification, the magnetic flux generated by the coil formed by winding the winding 4 around the core portion 12 is, for example, from the core portion 12 to the flange portion 14 and the flange portion 14. The magnetic path which returns to the core part 12 through the 2nd coating | coated part 10, 1st coating | coated part 8, and the collar part 15 which are arrange | positioned is comprised. Thus, the magnetic flux generated by the coil formed by winding the winding 4 around the winding core portion 12 passes through the first covering portion 8 between the pair of flange portions 14 and 15. Leakage magnetic flux can be suppressed to be small, and good inductance characteristics can be obtained.

  In the first modified example, since the second covering portion 10 is interposed between the flange portion 14 and the first covering portion 8, the flange portion 14 and the first covering portion 8 do not contact each other. For this reason, the magnetic path of the magnetic flux generated by the coil formed by winding the winding 4 is an open magnetic path passing through the second covering portion 10. That is, since the second covering portion 10 is interposed between the flange portion 14 and the first covering portion 8, a magnetic gap is formed by the second covering portion 10. Therefore, in the coil component C2, magnetic saturation is unlikely to occur and the direct current superimposition characteristics are improved.

  In the first modification, the second covering portion 10 is disposed so as to cover the main surface 14 a of the flange portion 14. Therefore, even when a part of the resin composition supplied into the region sandwiched between the pair of flange portions 14 and 15 enters through the gap between the windings 4 in the manufacturing process of the coil component C2, the resin composition An object does not adhere to the main surface 14a of the collar 14. Thereby, in the coil component C2, the direct current superimposition characteristic can be reliably improved.

  In the first modification, the second covering portion 10 is disposed so as to cover the peripheral side surface 14 c of the flange portion 14. Therefore, even when a part of the supplied resin composition overflows from the region sandwiched between the pair of flanges 14 and 15 in the manufacturing process of the coil component C2, the overflowed resin composition does not move between the pair of flanges 14. It does not adhere to the peripheral side surface 14c. Also by this, the direct current superimposition characteristics can be reliably improved in the coil component C2.

  In the coil component C3 according to the second modification shown in FIGS. 7 to 9, the second covering portion 10 is formed over the entire coil portion 6 by the winding 4 and the core 2. That is, the second covering portion 10 includes a portion exposed from the winding 4 on the main surfaces 14a and 15a of the pair of flange portions 14 and 15, the peripheral side surfaces 14c and 15c of the pair of flange portions 14 and 15, and the windings. 4 is arranged so as to cover 4. The first covering portion 8 is disposed in a region surrounded by the second covering portion 10. Moreover, the 2nd coating | coated part 10 is also arrange | positioned so that the main surfaces 14b and 15b of a pair of collar parts 14 and 15 may be covered.

  Next, a method for manufacturing the coil component C3 having the above-described configuration will be briefly described.

  First, the core 2 is formed by molding or machining. Then, the winding 4 is wound around the core portion 12 of the core 2. Thereby, the coil part 6 will be obtained.

  Next, resin is applied to the entire coil portion 6 (excluding the end portion of the winding 4) and cured. Thereby, the 2nd coating | coated part 10 will be formed. And with respect to the coil part 6 in which the 2nd coating | coated part 10 was formed, a resin composition is supplied in the area | region pinched | interposed into a pair of collar parts 14 and 15, and is hardened. Thereby, the 1st coating | coated part 8 will be formed.

  Next, the terminal electrodes 16 and 17 are attached to the core 2 (the flange portion 15), and the ends of the winding 4 are connected to the terminal electrodes 16 and 17 by welding. Through these processes, the coil component C3 is obtained.

  As described above, in the second modification, the magnetic flux generated by the coil formed by winding the winding 4 around the core portion 12 is, for example, from the core portion 12 to the flange portion 14 and the flange portion 14. A magnetic path that returns to the core 12 through the second cover 10, the first cover 8, the second cover 10 disposed in the flange 15, and the flange 15. Configure. Thus, the magnetic flux generated by the coil formed by winding the winding 4 around the winding core portion 12 passes through the first covering portion 8 between the pair of flange portions 14 and 15. Leakage magnetic flux can be suppressed to be small, and good inductance characteristics can be obtained.

  Also in the second modified example, since the second covering portion 10 is interposed between the pair of flange portions 14 and 15 and the first covering portion 8, each of the flange portions 14 and 15 and the first covering portion 8. And will not touch. The magnetic path of the magnetic flux generated by the coil formed by winding the winding 4 is an open magnetic path passing through the second covering portion 10. Therefore, as described above, in the coil component C3, magnetic saturation hardly occurs and the direct current superimposition characteristic is improved.

  In the coil component C3, since the entire coil portion 6 is covered with the second covering portion 10, the resin composition does not adhere to the core 2, and the direct current superimposition characteristics can be improved more reliably. .

  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 first modification, the second covering portion 10 is disposed on the collar portion 14, but may be disposed on the collar portion 15 instead of being disposed on the collar portion 14.

  In the present embodiment and each modification, the second covering portion 10 is disposed so as to cover the peripheral side surfaces 14c and 15c of the flange portions 14 and 15, but at least the main surface 14a of the flange portion 14 or the flange portion 15 is provided. What is necessary is just to arrange | position so that any one surface of the main surface 15a may be covered. Moreover, the 2nd coating | coated part 10 does not need to be formed over the main surfaces 14a and 15a of the collar parts 14 and 15. FIG. The second covering portion 10 is interposed between the first covering portion 8 and the flange portions 14 and 15, and if the first covering portion 8 does not contact the flange portions 14 and 15, the flange portions 14 and 15. It may be formed on a part of the main surfaces 14a, 15a.

  DESCRIPTION OF SYMBOLS 2 ... Core, 4 ... Winding, 6 ... Coil part, 8 ... 1st coating | coated part, 10 ... 2nd coating | coated part, 12 ... Core part, 14, 15 ... Gutter part, 14a, 14b, 15a, 15b ... main surface, 14c, 15c ... peripheral side surface, 16, 17, 26, 27 ... terminal electrode, C1-C3 ... coil components.

Claims (4)

Prepare a core having a core part and a pair of flanges arranged at both ends of the core part,
Forming a covering portion made of a non-magnetic material so as to cover the entire surface facing the other flange portion of at least one of the flange portions of the pair of flange portions;
After forming the covering portion made of a nonmagnetic material, the winding is wound around the core portion so as to be in contact with the core portion,
After winding the winding, so as to contact the winding and cover the winding and to be interposed between the other flange of the pair of flanges and the covering portion made of a nonmagnetic material, A method of manufacturing a coil component, comprising: forming a covering portion made of a cured resin containing a magnetic material in a region sandwiched between the pair of flanges.   The said coating | coated part which consists of a nonmagnetic material is formed so that it may cover the each surface where each of a pair of collar part mutually opposes before winding to the said core part. Manufacturing method of coil parts.   The coil part manufacturing method according to claim 1 or 2, wherein when the covering portion made of a nonmagnetic material is formed, the covering portion made of a nonmagnetic material is also formed on a peripheral side surface of the flange portion. Method. The coil component according to any one of claims 1 to 3, wherein a resin is used as the nonmagnetic material and the resin is applied and cured when the covering portion made of the nonmagnetic material is formed. Manufacturing method.

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