WO2024180925A1 - コイル部品 - Google Patents

コイル部品 Download PDF

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Publication number
WO2024180925A1
WO2024180925A1 PCT/JP2024/000566 JP2024000566W WO2024180925A1 WO 2024180925 A1 WO2024180925 A1 WO 2024180925A1 JP 2024000566 W JP2024000566 W JP 2024000566W WO 2024180925 A1 WO2024180925 A1 WO 2024180925A1
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WO
WIPO (PCT)
Prior art keywords
coil
core
end surface
flat plate
plate portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2024/000566
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
健司 奈良
達哉 佐々木
直樹 渡辺
信 長谷川
勇治 五十嵐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Priority to JP2025503625A priority Critical patent/JP7758245B2/ja
Publication of WO2024180925A1 publication Critical patent/WO2024180925A1/ja
Priority to US19/077,188 priority patent/US20250210250A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/04—Fixed inductances of the signal type with magnetic core
    • H01F17/045—Fixed inductances of the signal type with magnetic core with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/04—Fixed inductances of the signal type with magnetic core
    • H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F17/00—Fixed inductances of the signal type
    • H01F17/04—Fixed inductances of the signal type with magnetic core
    • H01F17/06—Fixed inductances of the signal type with magnetic core with core substantially closed in itself, e.g. toroid
    • H01F17/062—Toroidal core with turns of coil around it
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/2823—Wires
    • H01F27/2828—Construction of conductive connections, of leads
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/29—Terminals; Tapping arrangements for signal inductances
    • H01F27/292—Surface mounted devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F37/00—Fixed inductances not covered by group H01F17/00

Definitions

  • This disclosure relates to coil components.
  • a conventional coil component is described in WO2017/169737 (Patent Document 1).
  • This coil component has an annular core, a coil wound around the core, an electrode terminal connected to the coil, and a case that covers the core and the coil.
  • the electrode terminal is attached to the bottom surface of the bottom plate of the case.
  • the bottom plate includes a mounting base portion to which the electrode terminal is attached.
  • the electrode terminals are fixed to the bottom surface of the bottom plate of the case, for example, by an adhesive material. For this reason, if vibrations or impacts are applied to the coil component when it is mounted on a mounting board, there is a risk that the electrode terminals will peel off from the bottom plate (mounting base). In particular, when the core is made larger to handle larger currents and the weight of the coil component increases, the vibrations and impacts become greater, and peeling off of the electrode terminals from the bottom plate (mounting base) becomes more noticeable.
  • the objective of this disclosure is to provide a coil component that can reduce peeling between the electrode terminal and the mounting base.
  • a coil component comprises: An annular core; A coil wound around the core; an electrode terminal connected to the coil; a mounting portion to which the electrode terminal is attached, the mounting base portion has an inner end surface facing the core side, an outer end surface facing the opposite side to the inner end surface, a bottom surface connecting the inner end surface and the outer end surface, and a top surface facing the opposite side to the bottom surface, the mounting base portion having a slit hole penetrating the inner end surface and the outer end surface, the electrode terminal has a first flat plate portion, a second flat plate portion, and a connecting portion connecting the first flat plate portion and the second flat plate portion, the first flat plate portion and the second flat plate portion facing each other, The first flat plate portion is inserted into the slit hole, the connecting portion faces the outer end surface, the second flat plate portion faces the bottom surface, and the first flat plate portion is connected to an end of the coil.
  • the bottom surface refers to the surface that faces the mounting board when the coil component is mounted on the mounting board.
  • the first flat plate portion of the electrode terminal is inserted into the slit hole of the mounting base, so that the electrode terminal is inserted into the mounting base and attached.
  • This allows the electrode terminal to be securely fixed to the mounting base, and even if vibrations or impacts are applied to the coil component when the coil component is mounted on the mounting board, peeling off of the electrode terminal and the mounting base can be reduced.
  • the weight of the coil component increases, and vibrations and impacts increase, peeling off of the electrode terminal and the mounting base can be reduced.
  • the core is an elliptical ring-shaped body when viewed from the central axis direction
  • the mounting base portion includes a first mounting base portion and a second mounting base portion, When viewed from the central axis direction, the first mounting base portion and the second mounting base portion are located on either side of the core in the longitudinal direction of the core.
  • the first mounting base and the second mounting base are located on either side of the core in the longitudinal direction of the core, so that the first electrode terminal attached to the first mounting base and the second electrode terminal attached to the second mounting base can be positioned in the longitudinal direction of the core relative to the core.
  • This allows the coils connected to the first electrode terminal and the second electrode terminal to be wound around the oval longitudinal portion of the core along the longitudinal direction of the core, ensuring the number of turns of the coil.
  • the first mounting base portion and the second mounting base portion each have a plurality of the slit holes.
  • the first mounting base and the second mounting base each have a plurality of slit holes, so that an electrode terminal can be inserted into each slit hole.
  • the outer surface of the connecting portion opposite the outer end surface forms a fillet-forming region that becomes the portion where the solder wets up.
  • the solder wets the fillet-forming area of the connecting portion, improving the mounting strength of the coil component to the mounting board. Furthermore, if vibration or impact is applied to the coil component when mounting the coil component on the mounting board, stress is applied to the connecting portion, but since the solder wets the fillet-forming area of the connecting portion, the stress can be reduced by the solder. Furthermore, since the connecting portion faces the outer end surface, the solder can be confirmed from the outside.
  • the end face of the tip portion of the second flat plate portion opposite the connecting portion forms a fillet-forming region that becomes the portion where the solder wets up.
  • the solder wets the fillet-forming area of the second flat plate portion, improving the mounting strength of the coil component to the mounting board.
  • the tip of the first flat plate portion opposite the connecting portion protrudes from the inner end surface and is connected to the end of the coil.
  • the tip of the first flat plate portion protrudes from the inner end surface, so that the end of the coil can be easily connected.
  • the tip of the first flat plate portion is connected to the end of the coil, for example, when the end of the coil is connected to the tip of the first flat plate portion by welding, the heat of the welding is transmitted in sequence through the first flat plate portion and the connecting portion. This makes it difficult for the heat of the welding to be transmitted to the second flat plate portion, reducing discoloration and modification of the plating layer of Ni, Sn, etc. of the second flat plate portion, and ensuring mounting reliability.
  • connection portion between the first flat plate portion and the end portion of the coil is preferably covered with an adhesive member made of resin.
  • connection between the first flat plate and the end of the coil is covered with an adhesive material made of resin, so that the connection can be reliably secured and insulated.
  • first flat plate is fixed to the adhesive material, so that the electrode terminal can be prevented from slipping out of the slit hole in the mounting base.
  • the short-side opening dimension of the slit hole on the outer end face side is preferably larger than the short-side opening dimension of the slit hole on the inner end face side.
  • the opening dimension of the slit hole on the outer end face side is larger than the opening dimension of the slit hole on the inner end face side, making it easier to insert the first flat plate portion of the electrode terminal into the slit hole from the outer end face toward the inner end face.
  • the first flat plate portion is preferably pressed into at least the opening of the slit hole on the inner end face side.
  • the first flat plate portion is press-fitted into the slit hole, so that the electrode terminal can be firmly fixed to the mounting base portion.
  • the short-side dimension of the slit hole continuously decreases from the outer end surface toward the inner end surface.
  • the dimension of the slit hole in the short direction becomes continuously smaller from the outer end face toward the inner end face, so that the electrode terminal can be positioned with respect to the mounting base with higher accuracy when fixing the electrode terminal to the mounting base.
  • the inner surface of the slit hole preferably has a stepped surface that reduces the short-side dimension of the slit hole in stages from the outer end surface toward the inner end surface.
  • the inner surface of the slit hole has a stepped surface, which makes it easier to smoothly insert the first flat plate portion of the electrode terminal into the slit hole from the outer end surface toward the inner end surface.
  • the step surface is preferably an inclined surface in which the short dimension of the slit hole continuously decreases from the outer end surface toward the inner end surface.
  • the step surface is an inclined surface, which makes it easier to smoothly insert the first flat plate portion of the electrode terminal through the slit hole from the outer end surface toward the inner end surface.
  • the coil component according to one aspect of the present disclosure can reduce peeling between the electrode terminal and the mounting base.
  • FIG. 2 is a top perspective view showing the coil component of the first embodiment.
  • FIG. FIG. 2 is a bottom perspective view showing the inside of the coil component.
  • FIG. FIG. 2 is a schematic cross-sectional view of a coil component.
  • 6 is a cross-sectional view taken along line VI-VI of FIG. 1.
  • 13 is a top perspective view of a connection portion between an endmost straight pin member and a bent pin member in the first coil.
  • FIG. FIG. 2 is a top perspective view of a first electrode terminal.
  • FIG. 4 is a cross-sectional view of a first electrode terminal.
  • FIG. FIG. 4 is a cross-sectional view of a portion of the base case including a slit hole of the first mounting base portion.
  • FIG. 4 is a bottom view of the coil component excluding the bottom plate portion and the coil adhesive member.
  • FIG. 14 is a cross-sectional view taken along line XIV-XIV of FIG. 13 .
  • FIG. 11 is a cross-sectional view of a portion of a coil component according to a second embodiment, including a slit hole in a first mounting base portion of a base case.
  • Fig. 1 is an upper perspective view showing a coil component according to an embodiment of the present invention.
  • Fig. 2 is a lower perspective view of the coil component.
  • Fig. 3 is a lower perspective view showing the inside of the coil component.
  • Fig. 4 is an exploded perspective view of the coil component.
  • the coil component 1 has an annular core 3, a base case 22 covering at least a part of the core 3, a first coil 41 and a second coil 42 wound around the core 3 and the base case 22, first to fourth electrode terminals 51 to 54 attached to the base case 22, and a bottom plate portion 21 attached to the base case 22.
  • the coil component 1 is, for example, a common mode choke coil.
  • the base case 22 and the bottom plate 21 are made of a material that is strong and heat resistant, and preferably flame retardant.
  • the base case 22 is made of a resin such as PPS (polyphenylene sulfide), LCP (liquid crystal polymer), or PPA (polyphthalamide), or ceramics.
  • the base case 22 has a core cover part 60 that covers at least a portion of the core 3, a first mounting part 71 to which the first and third electrode terminals 51, 53 are attached, and a second mounting part 72 to which the second and fourth electrode terminals 52, 54 are attached.
  • the core cover part 60, the first mounting part 71, and the second mounting part 72 are an integrated, one-piece molded product.
  • the core cover part 60 is an annular container body. Specifically, the core cover part 60 has an inner periphery 60a, an outer periphery 60b, and a bottom 60c.
  • the core cover part 60 has an annular recess 61 that covers the lower part of the core 3.
  • the annular recess 61 is a space surrounded by the inner periphery 60a, the outer periphery 60b, and the bottom 60c.
  • the core cover part 60 (annular recess 61) is an oval (track-shaped) annular body.
  • the shape of the core cover part 60 may be rectangular, elliptical, or circular.
  • the first mounting base 71 and the second mounting base 72 are formed in a rectangular parallelepiped flange shape and are located on both sides of the core cover part 60. Specifically, the first mounting base 71 and the second mounting base 72 are located radially outside the core cover part 60. In this embodiment, the first mounting base 71 and the second mounting base 72 are located longitudinally outside the annular recess 61.
  • the first mounting base 71 has a slit hole 70 into which the first and third electrode terminals 51, 53 are inserted.
  • the second mounting base 72 has a slit hole 70 into which the second and fourth electrode terminals 52, 54 are inserted.
  • the bottom plate portion 21 has a bottom portion 210, two side wall portions 211, and a partition wall portion 212.
  • the bottom portion 210 includes a first main surface 210a and a second main surface 210b that face each other.
  • the two side wall portions 211 are provided on the first main surface 210a of the bottom portion 210 along each of a pair of opposing sides of the bottom portion 210.
  • the partition wall portion 212 is provided between the two side wall portions 211 on the first main surface 210a of the bottom portion 210.
  • the bottom plate portion 21 has a recess 215, and the recess 215 is surrounded by the bottom portion 210, the side wall portion 211, and the partition wall portion 212.
  • the bottom plate portion 21 is attached to the bottom 60c side of the core cover portion 60.
  • the bottom plate portion 21 is attached to the base case 22 so that the central axis of the core 3 is perpendicular to the first main surface 210a of the bottom portion 210.
  • the central axis of the core 3 refers to the central axis of the inner diameter hole portion of the core 3.
  • the shape of the bottom plate portion 21 is rectangular when viewed from the central axis direction of the core 3. In this embodiment, the shape of the bottom plate portion 21 is rectangular when viewed from the central axis direction of the core 3.
  • the direction in which the first mounting base 71 and the second mounting base 72 face each other as viewed from the central axis direction of the core 3 is the Y direction
  • the direction perpendicular to the Y direction as viewed from the central axis direction of the core 3 is the X direction
  • the height direction of the coil component 1, which is perpendicular to both the X and Y directions is the Z direction.
  • the bottom plate 21 and the base case 22 are arranged facing each other in the Z direction, with the bottom plate 21 on the lower side and the base case 22 on the upper side, with the upper side being the forward direction of the Z direction and the lower side being the reverse direction of the Z direction.
  • the direction from the first main surface 210a toward the core 3 is the upward direction.
  • the Y direction is the long axis direction of the core cover part 60
  • the X direction is the short axis direction of the core cover part 60.
  • the first to fourth electrode terminals 51 to 54 are attached to the base case 22.
  • the first electrode terminal 51 and the second electrode terminal 52 are located at two corners of the base case 22 that face each other in the Y direction
  • the third electrode terminal 53 and the fourth electrode terminal 54 are located at two corners of the base case 22 that face each other in the Y direction.
  • the first electrode terminal 51 and the third electrode terminal 53 face each other in the X direction
  • the second electrode terminal 52 and the fourth electrode terminal 54 face each other in the X direction.
  • the first and third electrode terminals 51, 53 are each inserted into a slit hole 70 in the first mounting base 71 and attached.
  • the second and fourth electrode terminals 52, 54 are each inserted into a slit hole 70 in the second mounting base 72 and attached.
  • the first to fourth electrode terminals 51-54 are each a metal plate bent into a U-shape. One end of each of the first to fourth electrode terminals 51-54 is inserted into the slit hole 70 and connected to the coils 41, 42. One end of each of the first to fourth electrode terminals 51-54 has a slit portion 51a-54a. The other end of each of the first to fourth electrode terminals 51-54 is located outside the mounting bases 71, 72 and is connected to a mounting board (not shown).
  • a dummy terminal 55 is attached to the second main surface 210b of the bottom plate portion 21.
  • the dummy terminal 55 is adhered to the second main surface 210b with an adhesive or the like.
  • the dummy terminal 55 is not electrically connected to the first coil 41 and the second coil 42.
  • the core 3 is a toroidal core, and is an elliptical (track-shaped) ring-shaped body when viewed from the central axis direction.
  • the core 3 When viewed from the central axis direction, the core 3 includes a pair of long portions 31 that extend along the long axis and face each other in the short axis direction, and a pair of short portions 32 that extend along the short axis and face each other in the long axis direction.
  • the shape of the core 3 may be rectangular, elliptical, or circular when viewed from the central axis direction.
  • the core 3 is composed of, for example, a ceramic core such as ferrite, or a magnetic core made of iron-based powder molding or nanocrystalline foil.
  • the core 3 has a first end face 301 and a second end face 302 that face each other in the central axis direction, an inner peripheral surface 303, and an outer peripheral surface 304.
  • the first end face 301 is the lower end face of the core 3 and is located on the bottom plate portion 21 side.
  • the second end face 302 is the upper end face of the core 3.
  • the short portion 32 has a convex portion on the second end face 302. In other words, the region of the second end face 302 that is located on the short portion 32 is located higher in the Z direction than the region of the second end face 302 that is located on the long portion 31.
  • the shape of a cross section perpendicular to the circumferential direction as viewed from the central axis direction of core 3 is rectangular.
  • First end face 301 and second end face 302 are disposed perpendicular to the central axis direction of core 3.
  • Inner peripheral surface 303 and outer peripheral surface 304 are disposed parallel to the central axis direction of core 3.
  • perpendicular is not limited to a completely perpendicular state, but also includes a substantially perpendicular state.
  • parallel is not limited to a completely parallel state, but also includes a substantially parallel state.
  • the core 3 is stored in the core cover part 60 of the base case 22 so that the long axis direction of the core 3 coincides with the Y direction.
  • a portion of the core 3 on the first end face 301 side is covered by the core cover part 60.
  • the lower portion of the core 3 is fitted into the annular recess 61 of the core cover part 60, so that the core 3 can be attached to the core cover part 60.
  • the core 3 is connected to the core cover part 60 via a core adhesive member 91.
  • the core adhesive member 91 is disposed in the annular recess 61 and bonds the first end face 301 of the core 3 to the bottom part 60c of the core cover part 60.
  • the first coil 41 and the second coil 42 are connected to the bottom plate portion 21 via a coil adhesive member 90.
  • the coil adhesive member 90 is disposed in the recess 215 of the bottom plate portion 21 and contacts the first coil 41, the second coil 42, and the base case 22.
  • the first coil 41 is wound around the core 3 and the core cover part 60 between the first electrode terminal 51 and the second electrode terminal 52. One end of the first coil 41 is connected to the first electrode terminal 51. The other end of the first coil 41 is connected to the second electrode terminal 52.
  • the second coil 42 is wound around the core 3 and the core cover part 60 between the third electrode terminal 53 and the fourth electrode terminal 54. One end of the second coil 42 is connected to the third electrode terminal 53. The other end of the second coil 42 is connected to the fourth electrode terminal 54.
  • the first coil 41 and the second coil 42 are wound spirally around the core 3 and the core cover part 60 along the circumferential direction of the core 3 as viewed from the central axis direction of the core 3. Specifically, the first coil 41 is wound around one longitudinal part 31 of the core 3 and the core cover part 60 along the longitudinal direction of the core 3, and the second coil 42 is wound around the other longitudinal part 31 of the core 3 and the core cover part 60 along the longitudinal direction of the core 3.
  • the winding axis of the first coil 41 and the winding axis of the second coil 42 run parallel to each other.
  • the first coil 41 and the second coil 42 are symmetrical with respect to the longitudinal axis of the core 3.
  • the number of turns of the first coil 41 and the second coil 42 are the same.
  • the winding direction of the first coil 41 around the core 3 is opposite to the winding direction of the second coil 42 around the core 3.
  • the winding direction from the first electrode terminal 51 to the second electrode terminal 52 of the first coil 41 is opposite to the winding direction from the third electrode terminal 53 to the fourth electrode terminal 54 of the second coil 42.
  • the first to fourth electrode terminals 51 to 54 are connected so that a common mode current flows from the first electrode terminal 51 to the second electrode terminal 52 in the first coil 41, and flows from the third electrode terminal 53 to the fourth electrode terminal 54 in the second coil 42; that is, the first to fourth electrode terminals 51 to 54 are connected so that the current flows in the same direction.
  • a common mode current flows through the first coil 41
  • a first magnetic flux is generated in the core 3 by the first coil 41.
  • a common mode current flows through the second coil 42
  • a second magnetic flux is generated in the core 3 in a direction in which the first magnetic flux and the core 3 reinforce each other. Therefore, the first coil 41 and the core 3, and the second coil 42 and the core 3 act as inductance components, and noise is eliminated from the common mode current.
  • the first coil 41 is formed by connecting multiple pin members by welding, such as laser welding or spot welding.
  • welding such as laser welding or spot welding.
  • FIG. 3 does not show the multiple pin members actually welded together, but shows the multiple pin members assembled together.
  • the method of connecting the multiple pin members is not limited to welding, and other connection methods using, for example, solder or a conductive adhesive material, may also be used. In the following, to simplify the explanation, it will be explained that welding is used as the method of connecting the multiple pin members.
  • the multiple pin members are rod-shaped members, not printed wiring or conductors.
  • the pin members have rigidity. Specifically, in a cross section perpendicular to the circumferential direction of the core 3, the pin members are shorter than the length of one circumference of the core passing through the first end face 301, the second end face 302, the inner peripheral surface 303, and the outer peripheral surface 304 of the core 3, and are also highly rigid, making them difficult to bend.
  • the multiple pin members include multiple bent pin members 410 bent into an approximately U-shape and multiple straight pin members 411, 412 extending in an approximately straight line. The straight pin members 411, 412 and the bent pin member 410 are alternately connected to form the spiral of the first coil 41.
  • the multiple straight pin members 411, 412 include the most end straight pin member 411 located at the most end on at least one side of the axial direction of the first coil 41.
  • the straight pin members other than the end straight pin member 411 are referred to as normal straight pin members 412 (hereinafter simply straight pin members 412).
  • the first coil 41 includes, from one end to the other, an endmost straight pin member 411 on one end side (one side), multiple sets of bent pin members 410 and straight pin members 412, and an endmost straight pin member 411 on the other end side (the other side).
  • the endmost straight pin member 411 and the straight pin member 412 have the same shape. However, this is not limited to this, and the endmost straight pin member 411 and the straight pin member 412 may have different shapes.
  • the length in the extension direction of the endmost straight pin member 411 may be shorter than the length in the extension direction of the straight pin member 412.
  • the spring index Ks of the folding pin member 410 is smaller than 3.6 at the radius of curvature R1 of the folding pin member 410 located at the corner of the outer peripheral surface 304 of the core 3 and the radius of curvature R2 of the folding pin member 410 located at the corner of the inner peripheral surface 303 of the core 3.
  • the spring index Ks can be expressed as the radius of curvature R1, R2 of the folding pin member / the wire diameter r of the folding pin member. In this way, the folding pin member 410 has high rigidity and is difficult to bend.
  • the bent pin members 410 and the straight pin members 412 are alternately connected by welding, for example, laser welding or spot welding.
  • One end of the straight pin member 412 is connected to one end of the bent pin member 410, and the other end of the straight pin member 412 is connected to one end of the other bent pin member 410.
  • multiple bent pin members 410 and straight pin members 412 are connected, and the multiple connected bent pin members 410 and straight pin members 412 are arranged in a spiral shape on the core 3. In other words, one turn is made up of one set of bent pin members 410 and straight pin members 412.
  • the bent pin member 410 is arranged parallel to each of the second end face 302, the inner peripheral face 303, and the outer peripheral face 304 of the core 3.
  • the bent pin member 410 extends in the X direction with a virtual line connecting both ends of the bent pin member 410 in the extension direction slightly tilted in the Y direction when viewed from the central axis direction of the core 3.
  • the bent pin member 410 is arranged such that a plane including the center line of the bent pin member 410 is slightly tilted in the Y direction with respect to a plane (XZ plane) perpendicular to the axial direction of the first coil 41.
  • the straight pin member 412 is arranged parallel to the first end face 301 of the core 3.
  • the straight pin member 412 extends in the X direction.
  • the most end straight pin member 411 is arranged parallel to the first end face 301 of the core 3.
  • the most end straight pin member 411 extends in a direction parallel to the straight pin member 412.
  • the first electrode terminal 51 is connected to one of the endmost straight pin members 411, which is connected to one end of the bent pin member 410 of the adjacent turn to the endmost straight pin member 411. A portion of the first electrode terminal 51 faces the endmost straight pin member 411, and the peripheral surface of the endmost straight pin member 411 is connected to the first electrode terminal 51. Specifically, a portion of the first electrode terminal 51 passes through the slit hole 70 of the first mounting base portion 71 and is connected to the peripheral surface of the endmost straight pin member 411.
  • the second electrode terminal 52 is connected to the other endmost straight pin member 411, which is connected to one end of the bent pin member 410 of the adjacent turn to the other endmost straight pin member 411.
  • a portion of the second electrode terminal 52 faces the other endmost straight pin member 411, and the peripheral surface of the other endmost straight pin member 411 is connected to the second electrode terminal 52.
  • a portion of the second electrode terminal 52 passes through the slit hole 70 of the second mounting base portion 72 and is connected to the peripheral surface of the other endmost straight pin member 411.
  • the second coil 42 is composed of multiple pin members, similar to the first coil 41. That is, the second coil 42 includes, from one end to the other, an endmost straight pin member 421 on one end side (one side), multiple sets of bent pin members 420 and straight pin members 422, and an endmost straight pin member 421 on the other end side (the other side).
  • the bent pin members 420 and straight pin members 422 are alternately connected and wound around the core 3. That is, the multiple bent pin members 420 and straight pin members 422 are connected, and the multiple connected bent pin members 420 and straight pin members 422 are wound spirally around the core 3.
  • the third electrode terminal 53 is connected to one of the endmost straight pin members 421, which is connected to one end of the bent pin member 420 of the adjacent turn to the endmost straight pin member 421.
  • a portion of the third electrode terminal 53 faces the endmost straight pin member 421, and the peripheral surface of the endmost straight pin member 421 is connected to the third electrode terminal 53.
  • a portion of the third electrode terminal 53 passes through the slit hole 70 of the first mounting base portion 71 and is connected to the peripheral surface of the endmost straight pin member 421.
  • the fourth electrode terminal 54 is connected to the other endmost straight pin member 421, which is connected to one end of the bent pin member 420 of the adjacent turn to the other endmost straight pin member 421.
  • a portion of the fourth electrode terminal 54 faces the other endmost straight pin member 421, and the peripheral surface of the other endmost straight pin member 421 is connected to the fourth electrode terminal 54.
  • a portion of the fourth electrode terminal 54 passes through the slit hole 70 of the second mounting base portion 72 and is connected to the peripheral surface of the other endmost straight pin member 421.
  • the first coil 41 and the second coil 42 each include a conductor portion and a coating that covers a portion of the conductor portion.
  • the conductor portion is, for example, a copper wire
  • the coating is, for example, a polyamideimide resin.
  • the thickness of the coating is, for example, 0.02 to 0.04 mm.
  • the endmost straight pin members 411, 421 are composed of uncoated conductor portions 411a, 421a.
  • the straight pin members 412, 422 are composed of uncoated conductor portions 412a, 422a.
  • the bent pin members 410, 420 are composed of conductor portions 410a, 420a and coatings 410b, 420b.
  • the conductor portions 410a, 420a are exposed from the coatings 410b, 420b.
  • the endmost straight pin members 411, 421, the straight pin members 412, 422 and the bent pin members 410, 420 are welded to each other, for example, at the exposed conductor portions 411a, 421a, 412a, 422a, 410a, 420a.
  • These conductor portions not covered by the coating i.e., the conductor portions exposed from the coating (without the coating), can be electrically connected to the outside.
  • FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 1.
  • the dummy terminal 55 is omitted.
  • the ends of adjacent pin members in the first coil 41 have a welded portion where they are welded together.
  • a welded portion refers to a portion that melts once during welding and then solidifies.
  • the first coil 41 has a first welded portion 81 and a second welded portion 82.
  • the straight pin member 412 and the bent pin member 410 of one turn form a first welded portion 81 where one conductor portion 412a of the straight pin member 412 and the conductor portion 410a of the bent pin member 410 are welded together, and the straight pin member 412 and the bent pin member 410 of the other turn form a second welded portion 82 where the other conductor portion 412a of the straight pin member 412 and the conductor portion 410a of the bent pin member are welded together.
  • FIG. 6 shows a turn composed of the straight pin member 412 and the bent pin member 410 of the first coil 41, the same applies to a turn composed of the endmost straight pin member 411 and the bent pin member 410.
  • the endmost straight pin member 411 is welded to the conductor portion 410a of the bent pin member 410 connected to the conductor portion 411a, forming the first welded portion 81 or the second welded portion 82.
  • the second coil 42 has a third weld 83 and a fourth weld 84.
  • the straight pin member 422 and the bent pin member 420 of one turn are welded at one conductor portion 422a of the straight pin member 422 and the conductor portion 420a of the bent pin member 420 to form the third weld 83
  • the straight pin member 422 and the bent pin member 420 of the other turn are welded at the other conductor portion 422a of the straight pin member 422 and the conductor portion 420a of the bent pin member to form the fourth weld 84.
  • the most end straight pin member 421 is welded at the conductor portion 420a of the bent pin member 420 connected to the conductor portion 421a to form the third weld 83 or the fourth weld 84.
  • the third welded portion 83 and the fourth welded portion 84 of the second coil 42 have the same configuration as the first welded portion 81 and the second welded portion 82 of the first coil 41, and their description will be omitted.
  • the core cover portion 60 is located between the conductor portions and welded portions of the coils 41, 42 that are exposed from the coating and the core 3. This allows for more reliable insulation between the conductor portions and welded portions of the coils 41, 42 and the core 3.
  • the core cover part 60 is provided over the first end face 301 of the core 3, a portion of the inner peripheral surface 303 of the core 3, and a portion of the outer peripheral surface 304 of the core 3.
  • the core cover part 60 has an inner peripheral part 60a facing the inner peripheral surface 303 of the core 3, an outer peripheral part 60b facing the outer peripheral surface 304 of the core 3, and a bottom part 60c facing the first end face 301 of the core 3.
  • the bottom part 60c has a first surface 60c1 opposite the first end face 301.
  • the core 3 is connected to the core cover part 60 via the core adhesive member 91.
  • the core adhesive member 91 By connecting the core adhesive member 91 to a part of the core 3, the stress on the core 3 received from the core cover part 60 is reduced, and deterioration of the magnetic properties of the core 3 can be suppressed. In other words, a decrease in the inductance value caused by magnetostriction can be suppressed.
  • the core cover part 60 may not be connected to the core 3 via the core adhesive member 91, and may simply be fitted into the core 3.
  • the core adhesive member 91 is provided between the first end face 301 of the core 3 and the bottom 60c of the core cover part 60. This makes it possible to reduce the effect of magnetostriction on the core 3 while stably attaching the core cover part 60 to the core 3.
  • the material of the core adhesive member 91 can be soft resin such as urethane resin or silicone resin. By using such soft resin, the effect of magnetostriction can be reduced.
  • the core adhesive member 91 is provided over the entire area between the first end face 301 of the core 3 and the bottom 60c of the core cover part 60, but it may be provided only in a portion of the area. Also, in FIG. 6, the core adhesive member 91 is provided between the first end face 301 of the core 3 and the bottom 60c of the core cover part 60, but it may be provided between the inner circumferential surface 303 of the core 3 and the inner circumferential portion 60a of the core cover part 60, or between the outer circumferential surface 304 of the core 3 and the outer circumferential portion 60b of the core cover part 60, or it may be provided in multiple locations among these.
  • the conductor portions exposed from the coating of the coils 41, 42 are disposed in the recess 215 so as to be located on the first main surface 210a side.
  • the coil adhesive member 90 is fixed in the recess 215 to adhere the coils 41, 42 to the bottom plate portion 21 and cover at least a portion of the conductor portions exposed from the coating of the coils 41, 42.
  • the coil adhesive member 90 covers all of the conductor portions.
  • the coil adhesive member 90 is made of, for example, a thermosetting resin, and is fixed to the coils 41, 42, the core cover portion 60, and the bottom plate portion 21 by hardening.
  • the coil adhesive member 90 contacts the inner surface of the recess 215, a part of the inner peripheral portion 60a of the core cover portion 60, a part of the outer peripheral portion 60b of the core cover portion 60, and a part of the bottom portion 60c of the core cover portion 60, and covers the conductor portions 411a, 412a, 410a exposed from the coating 410b of the first coil 41, and the conductor portions 421a, 422a, 420a exposed from the coating 420b of the second coil 42. Furthermore, the coil adhesive member 90 also covers the welded portions 81 to 84 of the coils 41, 42.
  • the coil adhesive member 90 Since the coil adhesive member 90 is fixed within the recess 215 of the bottom plate portion 21, the coil adhesive member 90 is stably fixed to the bottom plate portion 21, and as a result, the coil adhesive member 90 can stably fix the coils 41, 42 to the bottom plate portion 21. In addition, since the coil adhesive member 90 covers the conductor portions exposed from the coating of the coils 41, 42, defects such as electrical short circuits with the outside can be prevented. Furthermore, when the coil component 1 is subjected to an external force such as vibration or shock, the coil adhesive member 90 can absorb the shock and protect the coils 41, 42.
  • An example of the material for the coil adhesive member 90 is silicone resin. By using silicone resin, it is possible to improve reflow heat resistance and mechanical strength.
  • Fig. 7 is a top perspective view of the connection portion between the endmost straight pin member 411 and the bent pin member 410 in the first coil 41.
  • Fig. 7 shows a state immediately after the endmost straight pin member 411 is assembled to the bent pin member 410, that is, a state before the bent pin member 410 and the endmost straight pin member 411 are connected by, for example, welding.
  • the endmost straight pin member 411 has a rectangular cross section.
  • the cross-sectional shape of the endmost straight pin member 411 is not particularly limited, and may be a circle, an ellipse, or any other polygon other than a rectangle.
  • the end face 411ef of the second end 411e2 of the most end straight pin member 411 is provided with a wall portion 411w that protrudes in the direction of the center line 411c of the second end 411e2.
  • the end face 411ef of the first end 411e1 of the most end straight pin member 411 is provided with a wall portion 411w that protrudes in the direction of the center line 411c of the first end 411e1.
  • the center line 411c of the second end 411e2 is a line that passes through the center of gravity of the second end 411e2 in a cross section perpendicular to the extension direction (X direction) of the second end 411e2.
  • the end face 411ef of the second end 411e2 is the outer surface located at the outermost position in the direction of the center line 411c of the second end 411e2. The same is true for the end face 411ef of the first end 411e1.
  • the end surface 411ef is perpendicular to the center line 411c of the second end 411e2.
  • the shape of the wall portion 411w is not particularly limited, but in this embodiment, it is rectangular.
  • the wall portion 411w can be formed, for example, by pressing a part of the end surface of the second end 411e2 toward the center line 411c.
  • the wall portion 411w can be formed, for example, by cutting a part of the end surface of the second end 411e2.
  • the position where the wall portion 411w is provided on the end face 411ef is not particularly limited, but as in this embodiment, it is preferable that the wall portion 411w is provided at the end of the end face 411ef on the reverse Z direction side, and that the end face of the wall portion 411w on the reverse Z direction side and the end face of the end straight pin member 411 on the reverse Z direction side of the part excluding the wall portion 411w are flush with each other.
  • end straight pin member 411 to be stably assembled to the bent pin member 410, and the end face on the reverse Z direction side of the end straight pin member 411 can be made flat, so that when a laser is irradiated to the end face to weld it, for example, welding can be performed well without scattering the laser.
  • the folding pin member 410 has a circular cross section.
  • the cross section of the folding pin member 410 may be elliptical, polygonal, or the like.
  • the end face 410ef of the first end 410e1 of the folding pin member 410 is flattened.
  • the end face 410ef is perpendicular to the center line 410c of the first end 410e1.
  • the end face of the second end (not shown) of the folding pin member 410 is flattened.
  • the end face is perpendicular to the center line of the second end.
  • the end face 411ef of the second end 411e2 of the most distal straight pin member 411 faces the peripheral surface 410cf of the first end 410e1 of the bent pin member 410.
  • a portion of the end face 411ef is in contact with the peripheral surface 410cf.
  • the center line 410c of the first end 410e1 is a line passing through the center of gravity of the first end 410e1 in a cross section perpendicular to the extension direction of the first end 410e1.
  • the peripheral surface 410cf of the first end 410e1 is the outer surface in the circumferential direction centered on the center line of the first end 410e1.
  • the end face 411ef may be in contact with the peripheral surface 410cf via, for example, a conductive adhesive member.
  • connection portions of the multiple pin members there may be connection portions where the end face 411ef is not in contact with the peripheral surface 410cf, i.e., the end face 411ef and the peripheral surface 410cf are separated by a space.
  • the side surface 411wf of the wall portion 411w in a direction perpendicular to the center line 411c direction of the second end portion 411e2 faces the end face 410ef of the first end portion 410e1.
  • the side surface 411wf is in surface contact with the end face 410ef.
  • the corner portion of the first end portion 410e1 of the bent pin member 410 is fitted into the space surrounded by the end face 411ef of the endmost straight pin member 411 and the wall portion 411w.
  • the end face 410ef of the first end portion 410e1 is the outer surface located at the outermost side in the direction of the center line 410c of the first end portion 410e1.
  • the entire surface of the side surface 411wf may be in surface contact with the end surface 410ef, or a portion of the side surface 411wf may be in surface contact with the end surface 410ef, or the side surface 411wf may be in surface contact with the end surface 410ef via, for example, a conductive adhesive member.
  • connection portions of the multiple pin members there may be a connection portion in which the side surface 411wf is not in surface contact with the end surface 410ef, that is, the side surface 411wf and the end surface 410ef are separated by a space.
  • FIG. 8 is a top perspective view of the first electrode terminal 51.
  • Fig. 9 is a cross-sectional view of the first electrode terminal 51. Note that, although the first electrode terminal 51 will be described below, the configurations of the second electrode terminal 52, the third electrode terminal 53 and the fourth electrode terminal 54 are similar to the configuration of the first electrode terminal 51, and therefore detailed description thereof will be omitted.
  • the first electrode terminal 51 has a first flat plate portion 511, a second flat plate portion 512, and a connecting portion 513 that connects the first flat plate portion 511 and the second flat plate portion 512.
  • the first flat plate portion 511 and the second flat plate portion 512 face each other.
  • the first electrode terminal 51 is formed by bending a metal plate into a U-shape.
  • the first flat plate portion 511 is formed in a flat plate shape parallel to the XY plane.
  • the first flat plate portion 511 has a connection portion 511a that is connected to the first end portion 513a of the connecting portion 513, and a tip portion 511b on the opposite side to the connection portion 511a.
  • the tip portion 511b has a slit portion 51a. In other words, the tip portion 511b has a bifurcated shape.
  • the second flat plate portion 512 is formed in a flat plate shape parallel to the XY plane.
  • the second flat plate portion 512 has a connection portion 512a that is connected to the second end portion 513b of the connecting portion 513, and a tip portion 512b on the opposite side to the connection portion 512a.
  • the first flat plate portion 511 is located further in the Z direction than the second flat plate portion 512, and the first flat plate portion 511 and the second flat plate portion 512 face each other in the Z direction.
  • the connection portion 511a of the first flat plate portion 511 and the connection portion 512a of the second flat plate portion 512 face each other in the Z direction.
  • the connecting portion 513 is formed in a flat plate parallel to the XZ plane, except for the first end 513a and the second end 513b.
  • the first end 513a and the second end 513b are formed in a curved shape.
  • the thickness of the first electrode terminal 51 is, for example, 0.3 mm.
  • the first flat plate portion 511, the second flat plate portion 512, and the connecting portion 513 each have the same thickness.
  • the first electrode terminal 51 is, for example, composed of a copper plate and a plating layer covering the copper plate.
  • the plating layer is, for example, composed of Ni, Sn, etc.
  • FIG. 10 is an upper perspective view of the base case.
  • FIG. 11 is a lower perspective view of the base case.
  • the base case 22 has a core cover part 60 that covers at least a part of the core 3, a first mounting base part 71 to which the first and third electrode terminals 51, 53 are attached, and a second mounting base part 72 to which the second and fourth electrode terminals 52, 54 are attached.
  • the core cover part 60, the first mounting base part 71, and the second mounting base part 72 are integrated and molded into one piece.
  • the core cover part 60 and the mounting base parts 71, 72 are integrated, the core 3 housed in the core cover part 60 is supported by the mounting base parts 71, 72, and the position of the core 3 is stabilized.
  • the number of members constituting the coil part 1 can be reduced, the manufacturing process of the coil part 1 can be simplified.
  • the core cover part 60 has an inner periphery 60a, an outer periphery 60b, and a bottom 60c.
  • the annular recess 61 is a space surrounded by the inner periphery 60a, the outer periphery 60b, and the bottom 60c.
  • the core cover part 60 is an elliptical ring-shaped body with its major axis direction being in the Y direction and its minor axis direction being in the X direction.
  • the bottom 60c has a first surface 60c1 on the side opposite the opening side of the annular recess 61.
  • the first surface 60c1 is the surface that faces the mounting board when the coil component 1 is mounted on the mounting board.
  • the first surface 60c1 has a first region 60c11 around which the first coil 41 is wound, and a second region 60c12 around which the second coil 42 is wound.
  • the first region 60c11 and the second region 60c12 each correspond to a longitudinal portion of the core cover portion 60 that extends along the major axis.
  • the first mounting base 71 and the second mounting base 72 are formed in a rectangular parallelepiped brim shape and are located on both sides of the core cover 60. Specifically, the first mounting base 71 and the second mounting base 72 are located outside the core cover 60 in the long axis direction (Y direction). In other words, when viewed from the central axis direction of the core 3, the first mounting base 71 and the second mounting base 72 are located in the long axis direction of the core 3 on both sides of the core 3. This allows the first electrode terminal attached to the first mounting base 71 and the second electrode terminal attached to the second mounting base 72 to be arranged in the long axis direction of the core with respect to the core. This allows the first coil 41 connected to the first electrode terminal 51 and the second electrode terminal 52 to be wound around the oval longitudinal portion 31 of the core 3 along the long axis direction of the core 3, ensuring the number of turns of the first coil 41.
  • the first mounting base 71 has an inner end surface 711 facing the core cover 60, an outer end surface 712 facing the opposite side to the inner end surface 711, a bottom surface 713 connecting the inner end surface 711 and the outer end surface 712, a top surface 714 facing the opposite side to the bottom surface 713, and two first and second side surfaces 715 and 716 connecting the inner end surface 711 and the outer end surface 712 and connecting the bottom surface 713 and the top surface 714.
  • the bottom surface 713 is the surface that faces the mounting board when the coil component 1 is mounted on the mounting board.
  • the core cover 60 is attached to the inner end surface 711 of the first mounting base 71.
  • the second mounting base 72 has an inner end surface 721 facing the core cover 60, an outer end surface 722 facing the opposite side to the inner end surface 721, a bottom surface 723 facing the mounting board when mounted, a top surface 724 facing the opposite side to the bottom surface 723, and two first and second side surfaces 725 and 726 connecting the inner end surface 721 and the outer end surface 722 and connecting the bottom surface 723 and the top surface 724.
  • the bottom surface 723 is the surface that faces the mounting board when the coil component 1 is mounted on the mounting board.
  • the core cover 60 is attached to the inner end surface 721 of the second mounting base 72.
  • the first mounting base 71 has a number of slit holes 70.
  • the first and third electrode terminals 51, 53 are inserted into each slit hole 70.
  • the slit holes 70 are provided so as to penetrate the inner end face 711 and the outer end face 712 in the Y direction. When viewed from a direction perpendicular to the outer end face 712, the slit holes 70 extend in a direction in which the first side face 715 and the second side face 716 face each other (X direction).
  • One slit hole 70 into which the first electrode terminal 51 is inserted is provided on the bottom face 713 side and the first side face 715 side.
  • the other slit hole 70 into which the third electrode terminal 53 is inserted is provided on the bottom face 713 side and the second side face 716 side.
  • the second mounting base 72 has a number of slit holes 70.
  • the second and fourth electrode terminals 52, 54 are inserted into each slit hole 70.
  • the slit holes 70 are provided so as to penetrate the inner end face 721 and the outer end face 722 in the Y direction. When viewed from a direction perpendicular to the outer end face 722, the slit holes 70 extend in a direction in which the first side face 725 and the second side face 726 face each other (X direction).
  • One slit hole 70 into which the second electrode terminal 52 is inserted is provided on the bottom face 723 side and the first side face 725 side.
  • the other slit hole 70 into which the fourth electrode terminal 54 is inserted is provided on the bottom face 723 side and the second side face 726 side.
  • FIG. 12 is a cross-sectional view of a portion including the slit hole 70 of the first mounting base portion 71 in the base case 22. Note that the slit hole 70 of the first mounting base portion 71 will be described below, but since the configuration of the slit hole 70 of the second mounting base portion 72 is similar to the configuration of the slit hole 70 of the first mounting base portion 71, a detailed description thereof will be omitted.
  • the slit hole 70 is a long and narrow hole extending in the X direction when viewed from a direction perpendicular to the inner end face 711 or the outer end face 712.
  • the longitudinal direction of the slit hole 70 is the X direction in which the slit hole 70 extends
  • the lateral direction of the slit hole 70 is the Z direction, which is a direction perpendicular to the extension direction of the slit hole 70.
  • the first flat plate portion 511 of the first electrode terminal 51 is inserted into the slit hole 70.
  • the short-side opening dimension W1 of the slit hole 70 on the outer end surface 712 side is larger than the short-side opening dimension W2 of the slit hole 70 on the inner end surface 711 side. This makes it easier to insert the first flat plate portion 511 of the first electrode terminal 51 into the slit hole 70 from the outer end surface 712 toward the inner end surface 711.
  • the first flat plate portion 511 of the first electrode terminal 51 is press-fitted into at least the opening on the inner end surface 711 side of the slit hole 70. This allows the first flat plate portion 511 to be press-fitted into the slit hole 70, and the first electrode terminal 51 can be firmly fixed to the first mounting base portion 71. In addition, the coil adhesive 90 does not leak out of the base case 22 from the slit hole 70.
  • the opening dimension W2 on the inner end surface 711 side of the slit hole 70 is smaller than the thickness of the first flat plate portion 511 of the first electrode terminal 51. This allows the first flat plate portion 511 to be press-fitted into the slit hole 70, and the first electrode terminal 51 can be firmly fixed to the first mounting base portion 71.
  • the inner surface of the slit hole 70 has a stepped surface 701c that gradually reduces the short-side dimension of the slit hole 70 from the outer end surface 712 toward the inner end surface 711. This makes it easier to smoothly insert the first flat plate portion 511 of the first electrode terminal 51 into the slit hole 70 from the outer end surface 712 toward the inner end surface 711.
  • the inner surface of the slit hole 70 includes a first inner surface 701 on the upper side in the Z direction and a second inner surface 702 on the lower side in the Z direction.
  • the second inner surface 702 is a flat surface parallel to the Y direction.
  • the first inner surface 701 includes a first surface 701a on the outer end surface 712 side, a second surface 701b on the inner end surface 711 side, and a step surface 701c connecting the first surface 701a and the second surface 701b.
  • the first surface 701a and the second surface 701b are each flat surfaces parallel to the Y direction.
  • the second surface 701b is closer to the second inner surface 702 than the first surface 701a.
  • the step surface 701c is an inclined surface in which the dimension of the short side of the slit hole 70 continuously decreases from the outer end surface 712 toward the inner end surface 711.
  • the step surface 701c is inclined at an angle of less than 90° with respect to the penetration direction (Y direction) of the slit hole 70.
  • the step surface 701c is an inclined surface, it becomes easier to insert the first flat plate portion 511 of the first electrode terminal 51 into the slit hole 70 from the outer end surface 712 toward the inner end surface 711.
  • FIG. 13 is a bottom view of the coil component, in which the bottom plate portion and the coil adhesive member are not shown for the sake of convenience.
  • the endmost straight pin member 411 on the first electrode terminal 51 side faces the first surface 60c1 (first region 60c11) of the bottom 60c.
  • the first end 411e1 of the endmost straight pin member 411 is connected to the tip 511b of the first flat plate portion 511 of the first electrode terminal 51.
  • the second end 411e2 of the endmost straight pin member 411 is connected to the first end 410e1 of the bent pin member 410.
  • the endmost straight pin member 411 on the second electrode terminal 52 side faces the first surface 60c1 (first region 60c11) of the bottom 60c.
  • the first end 411e1 of the endmost straight pin member 411 is not connected to the bent pin member 410 and the second electrode terminal 52.
  • the second end 411e2 of the endmost straight pin member 411 is connected to the bent pin member 410 and to the second electrode terminal 52.
  • the endmost straight pin member 421 on the third electrode terminal 53 side faces the first surface 60c1 (second region 60c12) of the bottom 60c.
  • the first end 421e1 of the endmost straight pin member 421 is connected to the third electrode terminal 53.
  • the second end 421e2 of the endmost straight pin member 421 is connected to the bent pin member 420.
  • the endmost straight pin member 421 on the fourth electrode terminal 54 side faces the first surface 60c1 (second region 60c12) of the bottom 60c.
  • the first end 421e1 of the endmost straight pin member 421 is not connected to the bent pin member 420 and the fourth electrode terminal 54.
  • the second end 421e2 of the endmost straight pin member 421 is connected to the bent pin member 420 and to the fourth electrode terminal 54.
  • Fig. 14 is a cross-sectional view taken along line XIV-XIV in Fig. 13.
  • Fig. 14 illustrates a bottom plate portion and a coil adhesive member that are not illustrated in Fig. 13.
  • the connection relationship between the first electrode terminal 51 and the first mounting base portion 71 will be described, but the connection relationship between the second electrode terminal 52 and the second mounting base portion 72, the connection relationship between the third electrode terminal 53 and the first mounting base portion 71, and the connection relationship between the fourth electrode terminal 54 and the second mounting base portion 72 are similar to the connection relationship between the first electrode terminal 51 and the first mounting base portion 71, and therefore detailed description thereof will be omitted.
  • the first electrode terminal 51 is attached to the first mounting base 71 and connected to the end of the first coil 41.
  • the first flat plate portion 511 is inserted into the slit hole 70, the connecting portion 513 faces the outer end surface 712, the second flat plate portion 512 faces the bottom surface 713, and the first flat plate portion 511 is connected to the end of the endmost straight pin member 411 of the first coil 41.
  • the first flat plate portion 511 of the first electrode terminal 51 is inserted into the slit hole 70 of the first mounting base portion 71, so that the first electrode terminal 51 is inserted into the first mounting base portion 71 and attached.
  • This allows the first electrode terminal 51 to be securely fixed to the first mounting base portion 71, and even if vibration or impact is applied to the coil component 1 when the coil component 1 is mounted on the mounting board 100, peeling of the first electrode terminal 51 and the first mounting base portion 71 can be reduced.
  • the weight of the coil component 1 increases, and vibration and impact increase, peeling of the first electrode terminal 51 and the first mounting base portion 71 can be reduced.
  • the second flat plate portion 512 of the first electrode terminal 51 faces the bottom surface 713 of the first mounting base portion 71, when mounting the coil component 1 on the mounting substrate 100, the second flat plate portion 512 can be connected to the mounting substrate 100 via the solder 110. Specifically, the first electrode terminal 51 is connected to the pad portion 101 of the mounting substrate 100 via the solder 110.
  • the outer surface 513c of the connecting portion 513 opposite the outer end surface 712 constitutes a fillet-forming region that becomes the wetted portion of the solder 110.
  • the solder 110 wets up the fillet-forming region of the connecting portion 513, improving the mounting strength of the coil component 1 to the mounting board 100.
  • the connecting portion 513 since the solder 110 wets up the fillet-forming region of the connecting portion 513, the stress can be reduced by the solder 110.
  • the connecting portion 513 faces the outer end surface 712, the solder 110 can be confirmed from the outside.
  • the end surface 512b1 of the tip portion 512b of the second flat plate portion 512 constitutes a fillet-forming region that becomes the wetted portion of the solder 110.
  • the tip 511b of the first flat plate portion 511 protrudes from the inner end surface 711 and is connected to the end of the first coil 41. Specifically, the tip 511b protrudes from the inner end surface 711 toward the second mounting base portion 72.
  • the endmost straight pin member 411 of the first coil 41 is placed on the upper surface of the tip 511b of the first flat plate portion 511.
  • the upper surface of the tip 511b of the first flat plate portion 511 is the surface opposite to the surface of the tip 511b on the second flat plate portion 512 side.
  • the tip 511b of the first flat portion 511 protrudes from the inner end surface 711, so that the end of the first coil 41 can be easily connected.
  • the tip 511b of the first flat portion 511 is connected to the end of the first coil 41, for example, when the end of the first coil 41 is connected to the tip 511b of the first flat portion 511 by welding, the heat of the welding is transmitted in sequence through the first flat portion 511 and the connecting portion 513. As a result, the heat of the welding is less likely to be transmitted to the second flat portion 512, which reduces discoloration and modification of the plating layer of Ni, Sn, etc. of the second flat portion 512, and ensures mounting reliability.
  • connection portion between the first flat plate portion 511 and the end of the first coil 41 is covered with a coil adhesive member 90 made of resin.
  • the coil adhesive member 90 is in the recess 215 of the bottom plate portion 21, and exists in the space surrounded by the bottom plate portion 21, the core cover portion 60, the first mounting base portion 71, and the second mounting base portion 72. This ensures that the connection portion between the first flat plate portion 511 and the end of the first coil 41 is fixed and insulated by the coil adhesive member 90.
  • the first electrode terminal 51 can be prevented from slipping out of the slit hole 70 of the first mounting base portion 71.
  • the annular core 3 is housed in the core cover portion 60 of the base case 22 so that the first end face 301 located in the central axial direction of the core 3 is covered.
  • the core 3 is adhered to the core cover portion 60 by a core adhesive member 91.
  • the multiple straight pin members 411, 412, 421, 422 and the multiple bent pin members 410, 420 are arranged around the core 3 and the core cover part 60 so that the ends of each straight pin member 411, 412, 421, 422 and the ends of each bent pin member 410, 420 are positioned on the first surface 60c1 side of the core cover part 60.
  • the straight pin members 411, 412 and bent pin member 410 of the first coil 41 are wound around the core 3 with the core cover portion 60 fitted in, and the straight pin members 421, 422 and bent pin member 420 of the second coil 42 are wound around the core 3 so that the winding axes of the first coil 41 and the second coil 42 run parallel to each other.
  • the respective ends of the straight pin members 411, 412 and bent pin member 410 of the first coil 41 and the respective ends of the straight pin members 421, 422 and bent pin member 420 of the second coil 42 are positioned on the first surface 60c1 side of the core cover portion 60.
  • each straight pin member 411, 412, 421, 422 are connected to the ends of each bent pin member 410, 420 to form coils 41, 42 in which each straight pin member 411, 412, 421, 422 and each bent pin member 410, 420 are alternately connected.
  • the first coil 41 is formed by connecting the ends of each straight pin member 411, 412 to the ends of each bent pin member 410.
  • the second coil 42 is formed by connecting the ends of each straight pin member 421, 422 to the ends of each bent pin member 420.
  • the first electrode terminal 51 and the third electrode terminal 53 are inserted into each of the two slits 70 of the first mounting base 71 of the base case 22 from the outer end surface 712 toward the inner end surface 711.
  • the second electrode terminal 52 and the fourth electrode terminal 54 are inserted into each of the two slits 70 of the second mounting base 72 of the base case 22 from the outer end surface 722 toward the inner end surface 721.
  • the first to fourth electrode terminals 51 to 54 are connected to the endmost straight pin members 411 and 421, and the electrode terminals 51 to 54 are connected to the coils 41 and 42. Specifically, the first electrode terminal 51 and the second electrode terminal 52 are connected to the first coil 41. The third electrode terminal 53 and the fourth electrode terminal 54 are connected to the second coil 42.
  • the bottom plate portion 21 is attached to the base case 22 to manufacture the coil component 1. Specifically, the bottom plate portion 21 is attached to the first surface 60c1 side of the core cover portion 60. The bottom plate portion 21 is adhered to the coils 41, 42 and the base case 22 by the coil adhesive member 90.
  • Second Embodiment Fig. 15 is a cross-sectional view showing a coil component of the second embodiment.
  • the second embodiment differs from the first embodiment (Fig. 12) in the shape of the slit hole. This difference in configuration will be described below.
  • the other configurations are the same as those of the first embodiment, and the same reference numerals as those of the first embodiment are used and the description thereof will be omitted.
  • Figure 15 is a cross-sectional view of a portion including the slit hole 70A of the first mounting base part 71 in the base case 22. Note that the slit hole 70A of the first mounting base part 71 will be described below, but the configuration of the slit hole of the second mounting base part 72 may be similar to the configuration of the slit hole 70A of the first mounting base part 71, and detailed description thereof will be omitted.
  • the slit hole 70A is an elongated hole extending in the X direction when viewed from a direction perpendicular to the inner end face 711 or the outer end face 712, similar to the configuration of the slit hole 70 in the first embodiment.
  • the longitudinal direction of the slit hole 70A is the X direction in which the slit hole 70A extends
  • the lateral direction of the slit hole 70A is the Z direction, which is a direction perpendicular to the extension direction of the slit hole 70A.
  • the short-side opening dimension W1 on the outer end surface 712 side of the slit hole 70A is larger than the short-side opening dimension W2 on the inner end surface 711 side of the slit hole 70A.
  • the opening dimension W2 on the inner end surface 711 side of the slit hole 70A is smaller than the thickness of the first flat plate portion 511 of the first electrode terminal 51.
  • the dimension of the slit hole 70A in the short direction is continuously reduced from the outer end surface 712 to the inner end surface 711. This increases the accuracy of positioning the first electrode terminal 51 relative to the first mounting base 71 when fixing the first electrode terminal 51 to the first mounting base 71.
  • the dimension of the slit hole 70A in the short direction is continuously reduced from the outer end surface 712 to the inner end surface 711.
  • the dimension of the slit hole 70A in the short direction may be continuously reduced from the outer end surface 712 to the inner end surface 711.
  • the inner surface of the slit hole 70 includes a first inner surface 701 on the upper side in the Z direction and a second inner surface 702 on the lower side in the Z direction.
  • the first inner surface 701 and the second inner surface 702 are each flat surfaces.
  • the first inner surface 701 and the second inner surface 702 are each inclined at an angle smaller than 90° with respect to the penetration direction (Y direction) of the slit hole 70.
  • the first inner surface 701 and the second inner surface 702 are inclined with respect to the Y direction so as to approach each other from the outer end surface 712 toward the inner end surface 711.
  • the coil component at least comprises a core, a coil, an electrode terminal, and a mounting base, the mounting base having a slit hole, the electrode terminal having a first flat plate portion, a second flat plate portion, and a connecting portion, the first flat plate portion being inserted into the slit hole, the connecting portion facing the outer end surface, the second flat plate portion facing the bottom surface, and the first flat plate portion being connected to the end of the coil.
  • the core cover portion and the mounting base portion are integrated, but they may be separate, or the core cover portion and the mounting base portion may be separated. Alternatively, the core cover portion may be omitted. Alternatively, the mounting base portion may be integrated with the bottom plate portion.
  • the shape of the inner surface of the slit hole may be any shape as long as the short-side opening dimension of the outer end face side of the slit hole is larger than the short-side opening dimension of the inner end face side of the slit hole.
  • the short-side opening dimension of the outer end face side of the slit hole may be smaller than or the same as the short-side opening dimension of the inner end face side of the slit hole.
  • One turn of the coil is composed of one straight pin member and one bent pin member, but may be composed of one bent pin member.
  • the bent pin member has a length approximately equal to one revolution around the outer periphery of the core passing through the first end face, second end face, inner periphery, and outer periphery of the core.
  • one turn of the coil may be composed of multiple straight pin members.
  • the shape of the case and the shape of the core are not limited to the first embodiment and can be modified.
  • the number of coils is not limited to the first embodiment and can be modified.
  • the number of electrode terminals is not limited to the first embodiment and can be modified.
  • the present disclosure includes the following aspects. ⁇ 1> An annular core; A coil wound around the core; an electrode terminal connected to the coil; a mounting portion to which the electrode terminal is attached, the mounting base portion has an inner end surface facing the core side, an outer end surface facing the opposite side to the inner end surface, a bottom surface connecting the inner end surface and the outer end surface, and a top surface facing the opposite side to the bottom surface, the mounting base portion having a slit hole penetrating the inner end surface and the outer end surface, the electrode terminal has a first flat plate portion, a second flat plate portion, and a connecting portion connecting the first flat plate portion and the second flat plate portion, the first flat plate portion and the second flat plate portion facing each other, A coil component, wherein the first flat plate portion is inserted into the slit hole, the connecting portion faces the outer end surface, the second flat plate portion faces the bottom surface, and the first flat plate portion is connected to an end of the coil.
  • the core is an elliptical ring-shaped body when viewed from the central axis direction
  • the mounting base portion includes a first mounting base portion and a second mounting base portion
  • the coil component according to ⁇ 1> wherein, when viewed from the central axis direction, the first mounting base portion and the second mounting base portion are located on either side of the core in the longitudinal direction of the core.
  • ⁇ 4> The coil component according to any one of ⁇ 1> to ⁇ 3>, wherein an outer surface of the connecting portion opposite to the outer end surface constitutes a fillet formation region that becomes a portion where solder wets up.
  • ⁇ 5> The coil component according to any one of ⁇ 1> to ⁇ 4>, wherein an end face of a tip portion of the second flat portion opposite the connecting portion constitutes a fillet formation region that becomes a portion where solder wets up.
  • ⁇ 6> A coil component according to any one of ⁇ 1> to ⁇ 5>, wherein a tip portion of the first flat portion opposite the connecting portion protrudes from the inner end surface and is connected to the end portion of the coil.
  • ⁇ 7> The coil component according to any one of ⁇ 1> to ⁇ 6>, wherein a connection portion between the first flat plate portion and the end portion of the coil is covered with an adhesive member made of resin.
  • ⁇ 8> The coil component according to any one of ⁇ 1> to ⁇ 7>, wherein an opening dimension in the short side direction of the slit hole on the outer end surface side is larger than an opening dimension in the short side direction of the slit hole on the inner end surface side.
  • ⁇ 9> The coil component according to ⁇ 8>, wherein the first flat plate portion is press-fitted into at least an opening of the slit hole on the inner end surface side.
  • ⁇ 10> The coil component according to ⁇ 8> or ⁇ 9>, wherein a dimension of the slit in a short side direction becomes continuously smaller from the outer end surface toward the inner end surface.
  • ⁇ 11> The coil component according to ⁇ 8> or ⁇ 9>, wherein an inner surface of the slit has a stepped surface that gradually reduces a lateral dimension of the slit from the outer end surface to the inner end surface.
  • the step surface is an inclined surface in which a dimension in a short side direction of the slit hole continuously decreases from the outer end surface toward the inner end surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
PCT/JP2024/000566 2023-03-01 2024-01-12 コイル部品 Ceased WO2024180925A1 (ja)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2025503625A JP7758245B2 (ja) 2023-03-01 2024-01-12 コイル部品
US19/077,188 US20250210250A1 (en) 2023-03-01 2025-03-12 Coil component

Applications Claiming Priority (2)

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JP2023-031131 2023-03-01
JP2023031131 2023-03-01

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07130546A (ja) * 1993-10-28 1995-05-19 Tokin Corp 大電流用箱形ノイズフィルタ
JP2015103627A (ja) * 2013-11-22 2015-06-04 株式会社タムラ製作所 リアクトル

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07130546A (ja) * 1993-10-28 1995-05-19 Tokin Corp 大電流用箱形ノイズフィルタ
JP2015103627A (ja) * 2013-11-22 2015-06-04 株式会社タムラ製作所 リアクトル

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US20250210250A1 (en) 2025-06-26
JPWO2024180925A1 (https=) 2024-09-06

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