JP2008198740A - Winding coil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a winding coil capable of improving efficiency in acquiring inductance by reducing leaked magnetic flux from a connection portion between a flange of a core and a ferrite plate, and improving reliability by suppressing a change in the inductance caused by a temperature. <P>SOLUTION: The winding coil 10 is provided with a ferrite core 13 having a winding core 11 and a pair of flanges 12 formed on both ends of the winding core 11; a wire 14 wound around the winding core 11; terminal electrodes 15 connected to both ends of the wire 14 and formed on the flanges 12; and a ferrite plate 16 laid between the flanges 12. The flanges 12 have protruding portions 12A on the upper surface, and the ferrite plate 16 has through holes 16A engaged with the protruding portions 12A of the flanges 12, and the protruding portions 12A are bonded to the through holes 16A via an adhesive 17 on only side surfaces to which the protruding portions 12A and the through holes 16A are fitted, respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wire-wound coil, and more particularly to a wire-wound coil that can efficiently acquire a stable inductance.

  As this type of conventional winding type coil, for example, there is a common mode filter described in Patent Documents 1 and 2. The high-frequency common mode filter described in Patent Document 1 is wound around a core 1 having a core portion 1A and a flange portion 1B and a core portion 1A of the core 1 as shown in FIG. A wire (not shown), a terminal electrode 2 provided on the flange 1B of the core 1, and an upper end surface of the flange 1B at both ends across the core 1A with an adhesive (not shown). And both ends of the wire are electrically connected to the terminal electrode 2. As shown in the figure, a protrusion 1C is formed at the center of the upper surface of the flange 1B, and terminal electrodes 2 having a U-shaped side surface are respectively mounted on both sides of the protrusion 1C from the outside in the longitudinal direction of the core 1. . After connecting the end portion of the wire to the terminal electrode 2, the top plate 3 is joined to the flange portion 1 </ b> B through an adhesive such as epoxy resin and integrated with the core 1.

  Further, in the case of the common mode choke coil described in Patent Document 2, as shown in FIG. 6B, electrode protrusions 4B are provided on the flanges 4A at both ends of the drum core 4 made of a soft magnetic material, and the electrodes An electrode (not shown) is provided on the convex portion 4B, and a closed magnetic path is formed by fitting the return path body 5 and the drum core 4 having a U-shaped outer shape made of a soft magnetic material. In FIG. 6B, reference numeral 6 denotes lead-out lead portions at both ends of the coil winding.

JP 2005-056934 A JP 10-163029 A

  However, in the common mode filter of Patent Document 1, since the flange portion 1B of the core 1 and the ferrite plate 3 are bonded and fixed by an adhesive, the ferrite plate 3 and the flange portion 1B are respectively connected between the bonding surfaces. A gap with no magnetic material is formed as much as the adhesive layer, and magnetic flux leaks from this gap, resulting in a decrease in inductance acquisition efficiency. In addition, when the substrate on which the common mode filter is mounted is used in an environment where the temperature changes rapidly, the adhesive that joins the core 1 and the ferrite plate 3 expands and contracts depending on the temperature, and the gap between them changes. As the temperature changes, the inductance acquisition efficiency changes and the reliability decreases.

  Also, in the case of the common mode choke coil of Patent Document 2, since the flange portion 4A of the drum core 4 and the U-shaped return path body 5 are bonded and bonded with an adhesive, Similarly, magnetic flux leakage occurs. In this Patent Document 2, it is described that the gap of the joint portion between the flange portion 4A and the return path body 5 is minimized, but if the gap is minimized, the change in inductance is suppressed. However, since the bonding strength between the drum core 4 and the return path body 5 by the adhesive is lowered, the mechanical strength is lowered and the reliability is lowered.

  The present invention has been made to solve the above-described problem, and reduces the leakage of magnetic flux from the joint between the core flange and the ferrite plate to increase the inductance acquisition efficiency and suppress the change in inductance due to temperature. It is an object of the present invention to provide a wire-wound coil that can improve reliability.

  The winding type coil according to claim 1 of the present invention includes a core having a core portion and a pair of flange portions formed at both ends thereof, a winding wound around the core portion, In each of the winding-type coil parts, comprising both terminal electrodes connected to both ends and formed on each of the flanges, and a top plate made of a magnetic material provided between the flanges. The top plate and the top plate each have a fitting portion that fits to each other, and are joined to each other by an adhesive only on the side surface of the fitting portion.

  According to a second aspect of the present invention, there is provided a wound-type coil including a core having a core portion and a pair of flanges formed at both ends thereof, a winding wound around the core portion, and the winding. A wire-wound coil component including terminal electrodes respectively connected to both ends of the wire and formed on the flanges; and a top plate laid between the flanges. The end plate has a protrusion and the top plate has a through-hole that fits with the projection of the flange, and the protrusion of the flange and the through-hole of the top have a side surface that fits each other. It is characterized by being bonded to each other only by an adhesive.

  According to a third aspect of the present invention, there is provided a wound-type coil including a core having a core portion and a pair of flange portions formed at both ends thereof, a winding wound around the core portion, and the winding. A wire-wound coil component including terminal electrodes respectively connected to both ends of the wire and formed on the flanges; and a top plate laid between the flanges. The top plate has a protrusion and / or a recess on the end face, and has a recess and / or a protrusion that fits with the protrusion and / or the recess of the flange, and only on the side surface of the fitting part. It is characterized by being joined by an adhesive.

  Moreover, the winding type coil of Claim 4 of this invention is the invention of any one of Claims 1-3. WHEREIN: The junction area by the adhesive agent of the side surface of the said fitting part is the above-mentioned hook. It is characterized by being formed in a size larger than the area of the upper end surface of the part.

  According to the present invention, the leakage of magnetic flux from the joint between the core flange and the ferrite plate can be reduced to increase the inductance acquisition efficiency, and the reliability can be improved by suppressing the change in inductance due to temperature. A wound coil can be provided.

  Hereinafter, the present invention will be described based on the embodiment shown in FIGS. In each figure, FIGS. 1A and 1B are views showing an embodiment of a wound coil of the present invention, FIG. 1A is a perspective view thereof, and FIG. 1B is a cross section in the axial direction. FIGS. 2A and 2B are explanatory views for explaining the bonding strength of the wire-wound coil shown in FIG. 1, respectively. FIG. 2A is a plan view thereof, and FIG. 2B is an axial direction of a ferrite core. FIG. 3 is a transverse sectional view showing a state in which the top plate is attached to the ferrite core in the wound coil shown in FIG. 1, and FIG. 4 is a view showing another embodiment of the wound coil according to the present invention. FIG. 5 is a cross-sectional view corresponding to FIG. 3, and FIG. 5 is a cross-sectional view corresponding to FIG. 3, showing still another embodiment of the wound coil of the present invention.

First Embodiment A wire wound coil 10 according to the present embodiment includes a ferrite core 13 having a winding core portion 11 and flange portions 12 formed at both ends thereof as shown in FIGS. 1A and 1B, for example. And a winding (hereinafter referred to as “wire”) 14 wound around the core 11 of the ferrite core 13, and the ends of the wires 14 provided on the lower surfaces of both flanges 12. A terminal electrode 15 and a top plate (ferrite plate) 16 made of a magnetic material are provided so as to straddle the core portion 11 in the longitudinal direction and bonded to the upper surfaces of the flange portions 11B at both ends thereof. The wire 14 is provided with an insulating film on the surface and has a diameter of, for example, about 20 to 150 μm. The material of the terminal electrode 15 is not particularly limited as long as it is a metal used as an electrode. For example, the terminal electrode 15 is formed of an alloy of silver, nickel, copper, and tin.

  As shown in FIGS. 1A and 1B, a protrusion 12A is formed at the center of the surface of each flange 12 on the ferrite plate 16 side (hereinafter referred to as “upper surface”). Each portion 12A is fitted in a through-hole 16A formed in the ferrite plate 16. Since the left and right protrusions 12A are the same, only one protrusion 12A will be described. As shown in the figure, the protrusion 12A is formed in an elongated shape whose upper surface is smaller than the flange 12. The height of the protrusion 12A is formed to be substantially the same as the thickness of the ferrite plate 16, and the upper surface thereof is formed as a flat surface having no step from the upper surface of the ferrite plate 16. The side surface of the protrusion 12 </ b> A is formed perpendicular to the upper surface of the flange 12.

  Further, the protrusion 12A of the flange 12 and the through hole 16A of the ferrite plate 16 are fitted to each other as described above, and are attached to each other via a thermosetting adhesive 17 such as an epoxy resin on all sides of the fitting part. The ferrite core 13 and the ferrite plate 16 are integrated with each other. Therefore, the ferrite core 13 and the ferrite plate 16 are directly magnetically joined without any adhesive between the lower surface of the ferrite plate 16 and the upper surfaces on both sides of the flange 12A as in the prior art. Yes.

  That is, the ferrite core 13 and the ferrite plate 16 are joined and integrated by the adhesive 17 only on the entire side surface of the fitting portion of the projection 12A of the flange 12 and the through hole 16A of the ferrite plate 16, and the flange 12 and the ferrite plate 16 are integrated. Since the 16 horizontal joining surfaces are directly joined and magnetically integrated, magnetic flux leakage in the magnetically integrated part can be reduced, the magnetic flux can be efficiently turned around, and the effective permeability can be increased. Inductance acquisition efficiency can be increased. Further, since no adhesive is present on the horizontal joint surface between the flange 12 and the ferrite plate 16 as described above, the flange 12 and the ferrite plate 16 can be used even when the wound coil 10 is in an environment where the temperature changes greatly. Are always in direct contact with each other, and the gap between the flange 12 and the ferrite plate 16 does not change, and the change in inductance due to temperature can be suppressed, and the reliability during mounting can be improved.

  Next, the bonding strength between the ferrite core 13 and the ferrite plate 16 will be described with reference to FIGS. 2 (a) and 2 (b). As described above, the ferrite core 13 and the ferrite plate 16 are integrated by bonding only the entire side surface of the protrusion 12A and the entire inner peripheral surface of the ferrite plate 16 with the adhesive 17, and no adhesive is present at the other bonded portions. not being used. Here, as shown in FIG. 2A, assuming that the length of each side of the protrusion 12A is c and d and the height of the protrusion 12A is e, the area of the entire side surface of the protrusion 12A, that is, ferrite. The joint area S1 between the core 13 and the ferrite plate 16 is {(c + d) × e} × 2.

  On the other hand, in the conventional wire-wound coil, the entire upper surface of each flange is joined to the ferrite plate. The area of the upper surface of the collar portion is a × b as shown in FIG. 2A, and this is the bonding area S2 with the ferrite plate.

  Therefore, by setting the bonding area of the winding coil 10 of this embodiment larger than the bonding area of the conventional winding coil, that is, by setting S1> S2, the bonding strength of the winding coil 10 is conventionally increased. The ferrite core 13 and the ferrite plate 16 can be firmly integrated as the wound coil 10 to improve the mechanical strength and the resistance to thermal stress, and the reliability can be further improved. .

  When assembling the wound coil 10, a predetermined wire 14 is wound around the core 11 of the ferrite core 13 by a predetermined number of turns by a conventionally known method, and the end of the wire 14 is electrically connected to the terminal electrode 15. To do. Thereafter, as shown in FIG. 3, the adhesive 17 is applied to the protrusions 12 </ b> A of each flange 12 by a dip method or the like, and then the protrusions 12 </ b> A of each flange 12 and the through holes 16 </ b> A of the ferrite plate 16 are Alignment is performed, and each of the protrusions 12A and the through holes 16A are fitted to integrate the ferrite core 13 and the ferrite plate 16 together. Subsequently, the integrated ferrite core 13 and the ferrite plate 16 are heat-treated to cure the adhesive 17, thereby joining and integrating the flanges 12 and the ferrite plate 16.

  As a result, the ferrite core 13 and the ferrite plate 16 have the entire side surfaces of the left and right protrusions 12A and the entire inner peripheral surface of the through-hole 16A firmly integrated with the adhesive 17, and the other portions are interposed with the adhesive. Since the ferrite core 13 and the ferrite plate 16 are magnetically joined in direct contact with each other, leakage of magnetic flux from the joints of the flanges 12 and the ferrite plate 16 is prevented, and the magnetic flux is efficiently rotated and effective transmission is achieved. The magnetic susceptibility increases and the inductance acquisition efficiency can be increased. Further, since the horizontal surfaces of the flanges 12 and the ferrite plate 16 are in direct contact and no adhesive is present, there is no expansion and contraction of the adhesive due to temperature changes as in the prior art, and the flanges 12 and the ferrite plate 16 are always stable. Therefore, the change in inductance can be suppressed or prevented even in an environment where the temperature changes drastically, and the reliability can be improved.

  As described above, according to the present embodiment, each flange 12 has a protrusion 12A on the top surface, and the ferrite plate 16 has a through-hole 16A that fits with each protrusion 12A of each flange 12, and The protrusion 12A and the through hole 16A are joined to each other by the adhesive 17 only on the side surfaces to be fitted to each other, so that the flange 12A of the ferrite core 13 and the lower surface of the ferrite plate 16 are in direct contact with each other and magnetically. The magnetic flux leakage from this portion is reduced to improve the effective magnetic permeability and increase the inductance acquisition efficiency, and the change in inductance due to temperature can be suppressed and the reliability can be improved.

  In addition, according to the present embodiment, the bonding area S1 by the adhesive on the side surface of the fitting portion between the flange portion 12 and the ferrite plate 16 is formed to have a size larger than the area S2 of the upper surface of the flange portion 12, The joint strength between the ferrite core 13 and the ferrite plate 16 can be increased, and the mechanical strength and thermal stress resistance can be improved.

Second Embodiment In the present embodiment, as shown in FIG. 4, a recess 16B is provided on the flange 12 side instead of the through hole of the ferrite plate 16 in the first embodiment, and a protrusion that fits into the recess 16B. Except that 12A is provided on the upper surfaces of the left and right flanges 12, the configuration is the same as that of the first embodiment.

  The height of the protrusion 12 </ b> A of the flange 12 is substantially the same as the depth of the recess 16 </ b> B of the ferrite plate 16. Then, only the entire side surface of the protrusion 12A and the entire inner peripheral surface of the recess 16B are joined by the adhesive 17, and the upper surface of the protrusion 12A and the bottom surface of the recess 16B are in direct contact. Therefore, the upper surface of both sides of the protrusion 12A of the flange 12 and the ferrite plate 16 are in direct contact and magnetically coupled and integrated, and the upper surface of the protrusion 12A and the bottom of the recess 16B are also in direct contact. Since they are magnetically integrated, the present embodiment can achieve the same effects as the first embodiment.

Third Embodiment In this embodiment, as shown in FIG. 5, except that the relationship between the recess 16B of the ferrite plate 16 and the protrusion 12A of the flange 12 in the second embodiment is reversed. It is comprised according to 2 embodiment.

  That is, a recess 12B is formed on the upper surface of the flange 12 instead of the protrusion 12A of the second embodiment, and a protrusion 16C corresponding to the recess 12B of the flange 12 is formed on the ferrite plate 16. The depth of the recess 12B of the flange 12 and the height of the protrusion 16C are formed to have substantially the same dimensions. Only the entire inner peripheral surface of the recess 12B and all the side surfaces of the protrusion 16C are joined by the adhesive 17, and the bottom surface of the recess 12B and the lower surface of the protrusion 16C are in direct contact. Therefore, the upper surface of both sides of the recess 12B of the flange 12 and the ferrite plate 16 are in direct contact and magnetically integrated, and the bottom surface of the recess 12B and the lower surface of the protrusion 16C are also in direct contact and magnetically. In this embodiment, the same effects can be obtained as in the first embodiment.

  The present invention is not limited to the above embodiments. For example, in each of the embodiments described above, the case where the elongated protrusion 12A or the recess 12B is provided in the center of the upper surface of the flange 12 has been described. However, these protrusions or recesses may be provided in a plurality of locations. In addition, the protrusion and the recess may be mixed and provided. In this case, the top plate may be provided with a recess and / or protrusion corresponding to the protrusion and / or recess of the collar. Further, if the bonding strength between the core and the top plate can be ensured, all the side surfaces of the fitting portion can be partially bonded by an adhesive. In short, in the present invention, in any case, only the side surface of the fitting portion between the collar portion and the top plate is joined by the adhesive, and the horizontal joint surfaces of the collar portion and the top plate are in direct contact with each other. Therefore, it has a structure without adhesive.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a wire-wound coil used in electronic equipment, communication equipment, and the like.

(A), (b) is a figure which shows one Embodiment of the coil | winding type | mold coil of this invention, respectively, (a) is the perspective view, (b) is sectional drawing of an axial center direction. (A), (b) is explanatory drawing for demonstrating the joint strength of the winding type coil shown in FIG. 1, respectively, (a) is the top view, (b) is sectional drawing of the horizontal direction of a core. FIG. 2 is a cross-sectional view in the axial direction showing a state where a ferrite plate is mounted on a core in the wound coil shown in FIG. 1. It is a figure which shows other embodiment of the winding type coil of this invention, and is sectional drawing equivalent to FIG. It is a figure which shows other embodiment of the winding type coil of this invention, and is sectional drawing equivalent to FIG. (A) and (b) are perspective views which respectively show the conventional winding type coil.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Winding type coil 11 Core part 12 collar part 12A Protrusion part 12B Concave part 13 Ferrite core 14 Wire 15 Terminal electrode 16 Ferrite plate 16A Through-hole 16B Concave part 16C Protrusion part

Claims (4)

  A core having a winding core and a pair of flanges formed at both ends thereof, a winding wound around the winding core, and both ends of the winding are connected to each other and formed at each flange. In the wound-type coil component comprising the terminal electrode formed and the top plate laid between the flanges, the flanges and the top plate each have a fitting portion that fits each other. And the winding type coil components mutually joined only by the adhesive agent on the side surface of the said fitting part.   A core having a winding core and a pair of flanges formed at both ends thereof, a winding wound around the winding core, and both ends of the winding are connected to each other and formed at each flange. And a top plate installed between the flanges. Each of the flanges has a protrusion on an upper end surface, and the top plate is a protrusion of the flange. And the projections of the flanges and the through holes of the top plate are joined to each other by an adhesive only on the side surfaces to be fitted. Linear coil parts.   A core having a winding core and a pair of flanges formed at both ends thereof, a winding wound around the winding core, and both ends of the winding are connected to each other and formed at each flange. In the coiled coil component comprising the terminal electrode formed and the top plate laid between the flanges, each flange has a protrusion and / or a recess on the upper end surface, and the top plate is A wound-type coil component having a recess and / or a protrusion that fits into a protrusion and / or a recess of a flange, and that is joined to each other only by a side surface of the fitting portion. .   The wire-wound coil component according to any one of claims 1 to 3, wherein a bonding area of the side surface of the fitting portion by an adhesive is formed to be larger than an area of an upper end surface of the flange portion. .

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