WO2016006200A1 - コイル部品およびその製造方法 - Google Patents
コイル部品およびその製造方法 Download PDFInfo
- Publication number
- WO2016006200A1 WO2016006200A1 PCT/JP2015/003277 JP2015003277W WO2016006200A1 WO 2016006200 A1 WO2016006200 A1 WO 2016006200A1 JP 2015003277 W JP2015003277 W JP 2015003277W WO 2016006200 A1 WO2016006200 A1 WO 2016006200A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- slit
- holding member
- coil
- coil element
- coil component
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 24
- 238000000034 method Methods 0.000 title claims description 8
- 239000006247 magnetic powder Substances 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims description 13
- 238000003466 welding Methods 0.000 claims description 12
- 239000002184 metal Substances 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000000696 magnetic material Substances 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims description 2
- 239000004020 conductor Substances 0.000 claims 1
- 230000000994 depressogenic effect Effects 0.000 abstract 2
- 229910000679 solder Inorganic materials 0.000 description 9
- 239000011347 resin Substances 0.000 description 8
- 229920005989 resin Polymers 0.000 description 8
- 229920001187 thermosetting polymer Polymers 0.000 description 8
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000011230 binding agent Substances 0.000 description 6
- 238000004049 embossing Methods 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000000754 repressing effect Effects 0.000 description 2
- 238000003892 spreading Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000011812 mixed powder Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
Images
Classifications
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- 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
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
- H01F27/255—Magnetic cores made from particles
-
- 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
- H01F27/24—Magnetic cores
- H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
-
- 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
-
- 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
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/10—Connecting leads to windings
-
- 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
- H01F2017/048—Fixed inductances of the signal type with magnetic core with encapsulating core, e.g. made of resin and magnetic powder
Definitions
- the present invention relates to a coil component used in various electronic devices and a manufacturing method thereof.
- An example of the electronic component is a coil component.
- FIG. 17 is a perspective view of the conventional coil component 5.
- the conventional coil component 5 includes a coil element 1 around which a copper wire with insulation coating is wound, and the end of the coil element 1 and the holding member 3 are welded.
- a part of the coil element 1 and the holding member 3 are embedded in the magnetic core 2 by being integrally molded with a mixed powder composed of a binder containing a thermosetting resin and a metal magnetic powder, and from the side surface of the magnetic core 2.
- the terminal 4 is formed by bending the end of the protruding coil element 1 and the holding member 3.
- Patent Document 1 As prior art document information related to this application, for example, Patent Document 1 is known.
- 17 is a method of reducing the size of the holding member 3 as one of methods for reducing the size of the coil component 5 in FIG. If the holding member 3 is made smaller, it is necessary to reduce the thickness. If the thickness is reduced, the holding member 3 is easily distorted during welding. The distortion of the holding member 3 occurs, for example, when the holding member 3 and the end of the coil element 1 are welded. Of these weldings, large strains are likely to be generated in the holding member 3 particularly by electric resistance welding. In electrical resistance welding, the end of the coil element 1 and the holding member 3 are sandwiched by applying pressure with a welding electrode. Due to the pressure of the welding electrode, the holding member 3 is strained in a direction perpendicular to the direction in which the end of the coil element 1 extends.
- the holding member 3 is distorted, there is a possibility that when the magnetic material and the holding member 3 are pressure-molded, the distortion of the holding member 3 is sandwiched between molds and cannot be molded well. On the other hand, a method of enlarging the mold clearance is also conceivable, but this is not preferable because the productivity decreases because the magnetic material leaks during pressure molding.
- the coil component of the present invention includes a magnetic core containing a binder and a magnetic powder mixed with the binder, a coil element embedded in the magnetic core, and a coil element. And a holding member that holds the end of each of them.
- the coil element has an end protruding from the magnetic core.
- the holding member is provided with a recessed portion that is recessed toward the magnetic core.
- the holding member has a protrusion that protrudes from the bottom surface of the recess and extends linearly along the bottom surface.
- the protrusion has a portion that intersects the end of the coil element, and is welded to the end of the coil element at the intersecting portion.
- FIG. 1 is an exploded perspective view of a coil component according to an embodiment of the present invention.
- FIG. 2 is a perspective view of the coil component according to the embodiment.
- FIG. 3 is a cross-sectional view taken along line III-III of the coil component in FIG. 4 is a cross-sectional view taken along line IV-IV of the coil component in FIG.
- FIG. 5 is a side view showing the vicinity of the holding member of the coil component in FIG.
- FIG. 6 is a perspective view of the coil component according to the embodiment.
- FIG. 7 is a side view showing the vicinity of the holding member of the coil component in FIG.
- FIG. 8 is a perspective view of the coil component according to the embodiment.
- FIG. 9 is a side view showing the vicinity of the coil component holding member in FIG. FIG.
- FIG. 10 is a diagram for explaining a method of manufacturing the coil component of FIG.
- FIG. 11 is a diagram for explaining a method of manufacturing the coil component of FIG.
- FIG. 12 is a diagram for explaining a method of manufacturing the coil component of FIG.
- FIG. 13 is a diagram for explaining a method of manufacturing the coil component of FIG.
- FIG. 14 is a diagram for explaining a method of manufacturing the coil component of FIG.
- FIG. 15 is a diagram for explaining a method of manufacturing the coil component of FIG.
- FIG. 16 is a diagram for explaining a method of manufacturing the coil component of FIG.
- FIG. 17 is a perspective view of a conventional coil component.
- FIG. 1 is an exploded perspective view of a coil component 10 according to the first embodiment.
- the coil component 10 includes a magnetic core 11 made of a binder containing a thermosetting resin, a metal magnetic powder, a coil element 12 formed by winding a conductive wire in a spiral shape, an external terminal, and an electric terminal.
- the winding portion of the coil element 12 is embedded in the magnetic core 11, and the end 12 a of the coil element 12 is exposed from the magnetic core 11.
- the end 12a of the coil element 12 is electrically connected to the holding member 13 by welding.
- a part of the holding member 13 is embedded and fixed in the magnetic core 11.
- FIG. 2 is a perspective view of the magnetic core 11 of the coil component 10 seen through, and the outline of the magnetic core 11 is indicated by a broken line.
- FIG. 3 is a cross-sectional view taken along line III-III in which the holding member 13 and the end 12a of the coil element 12 in FIG. 2 are welded.
- 4 is a cross-sectional view taken along line IV-IV in which the holding member 13 and the end 12a of the coil element 12 in FIG. 2 are welded.
- FIG. 5 is a side view showing the vicinity of the holding member 13 in FIG.
- the magnetic core 11 shown in FIG. 2 includes the green compact 19a and the green compact 19b shown in FIG.
- the green compact 19a and the green compact 19b are formed at a density of about 1 ton / cm 2 by mixing a binder containing a thermosetting resin and a metal magnetic powder in a state where the thermosetting resin is not completely cured. It is formed by pressure molding with pressure.
- the green compact 19 b has a prismatic shape having a storage portion 119 b for storing the coil element 12.
- the green compact 19a has a shape of a lid that covers the green compact 19b.
- the coil element 12 is housed in a housing portion 119b that is a cavity provided in the green compact 19b.
- the molding pressure for re-pressure molding is about 5 ton / cm 2 , which is larger than the molding pressure for pressure molding.
- the green compact 19a and the green compact 19b are thinner after repressing than before repressing. In other words, the molding density of the green compact 19a and the green compact 19b is greater after re-press molding than before re-press molding.
- the coil element 12 is embedded in the green compact 19a and the green compact 19b, and the end 12a of the coil element 12 and the holding member 13 protrude from the interface between the green compact 19a and the green compact 19b.
- a magnetic core 11 is obtained.
- the thermosetting resin contained in the magnetic core 11 is completely cured by heat treatment.
- the coil element 12 is formed by winding a copper wire having an insulating coating on its surface in a coil shape.
- the diameter of the coil element 12 is 0.3 mm.
- the insulating coating on the surface of the end portion 12a of the coil element 12 is peeled off in advance until it is welded and electrically connected to the protrusion 17 described later.
- the end 12a of the coil element 12 is pressed and has a flat shape with a thickness of about 0.2 mm.
- the holding member 13 is formed by punching a copper plate having a thickness of about 0.15 mm.
- the two holding members 13 extend along two opposite side surfaces of the magnetic core 11, and are respectively provided by being bent on the bottom surface of the magnetic core 11.
- one holding member 13 has a protruding portion 21a and a protruding portion 21b protruding from both ends of one end
- the other holding member 13 has a protruding portion 21c protruding from both ends of one end. It has a protrusion 21d.
- the protrusion 21a, the protrusion 21b, the protrusion 21c, and the protrusion 21d are embedded in the magnetic core 11 and fixed.
- the holding member 13 protruding from the magnetic core 11 may be solder dipped and covered with solder as necessary.
- the holding member 13 constitutes a terminal portion 20 together with the end portion 12a of the coil element 12, and is connected to an external terminal.
- the holding member 13 has a recessed portion 18 that is recessed closer to the magnetic core 11 than other regions in a region that includes a portion that overlaps the end 12a of the coil element 12.
- the holding member 13 has a main surface 113a provided with a recess 18. In the present embodiment, the depth of the recess 18 is about 0.2 mm.
- the holding member 13 has a protrusion 17 that protrudes from the bottom surface 22 of the recess 18.
- the protrusion 17 is formed in a straight line so as to intersect the extending direction in which the end 12 a of the coil element 12 extends, and is formed by embossing from the back surface opposite to the bottom surface 22 of the recess 18. Is done.
- the protrusion 17 is welded and electrically connected to the end 12a of the coil element 12 by electrical resistance welding in a state of intersecting the end 12a of the coil element 12.
- the length of the protrusion 17 is larger than the width of the end 12 a of the coil element 12.
- the height of the protrusion 17 protruding from the bottom surface 22 is 0.1 mm.
- the protrusion 17 is formed by embossing from the back side of the bottom surface 22 of the recess 18.
- a groove 17a is formed along the shape of the protrusion 17 on the back side of the protrusion 17 by embossing.
- the holding member 13 can be made thin, so that the small coil component 10 can be realized.
- the direction 24 indicates the side surface of the magnetic core 11 on which the holding member 13 is provided and the bottom surface of the coil component 10. Point in parallel direction.
- the cross section of the protrusion 17 in a direction orthogonal to the extending direction of the protrusion 17 has a convex shape that becomes narrower from the root of the protrusion 17 toward the tip.
- Specific examples of the cross-sectional shape of the protrusion 17 include a triangle, an arc, and a trapezoid. Since the protrusion 17 has the convex shape as described above, the electric current when electric resistance welding is performed is concentrated on the top of the convex protrusion 17, so that the protrusion 12 is stably held with the end 12 a of the coil element 12.
- the member 13 can be welded.
- the protrusion 21a and the protruding portion 21b are displaced in the direction 24 away from each other, and the protruding portion 21a and the protruding portion 21b are sandwiched between the molds during re-pressure molding. Is an issue.
- the protrusion 21c and the protrusion 21d have the same problem as described above.
- the protrusion 17 has a cross-sectional shape that is convex, and is provided in a straight line in a direction intersecting the end 12a of the coil element 12.
- the direction can be the direction 23.
- the protrusion 17 easily extends in the direction 23, so that the protrusion 21 a, the protrusion 21 b, the protrusion 21 c, and the protrusion 21 d of the holding member 13 are not easily displaced in the direction 24.
- the protrusion 17 is provided so as to be orthogonal to the extending direction of the end 12a of the coil element 12, the protrusion 21a, the protrusion 21b, the protrusion 21c, and the protrusion 21d of the holding member 13 are further displaced in the direction 24. It becomes difficult.
- the protrusion 17 that protrudes from the bottom surface 22 of the recess 18 is provided in the recess 18.
- FIG. 6 is a perspective view of the coil component 10a according to the second embodiment.
- the broken line in FIG. 6 shows the outline of the magnetic core 11.
- FIG. 7 is a side view showing the vicinity of the holding member 13 of FIG.
- the holding member 13 is provided with slits 14 and 15 that are disposed with the end 12a of the coil element 12 and the protrusion 17 interposed therebetween and penetrate the holding member 13.
- the holding member 13 and the end portion 12a of the coil element 12 are electrically resistance welded.
- the stress spreading in the direction 24 can be reduced.
- the long sides of the slit 14 and the slit 15 are parallel to each other, the length in the direction 23 is about 1.2 mm, and the length in the direction 24 is about 0.3 mm.
- the interval between the slit 14 and the slit 15 is about 1 mm.
- the holding member 13 is further provided with a slit 16 penetrating the holding member 13.
- the slit 16 is provided in a region obtained by extending a region sandwiched between the slit 14 and the slit 15 in the extending direction of the end 12 a of the coil element 12.
- the slit 16 has a rectangular shape in which the length in the direction 24 is about 0.6 mm and the length in the direction 23 is about 0.3 mm.
- the distance between the slit 16 and the slit 14 and the distance between the slit 16 and the slit 15 are both about 0.5 mm.
- the holding member 13 is connected to the main surface 113 a of the holding member 13 and the bottom surface 22 of the recess 18, and a step 13 a (region surrounded by a broken line) that forms a step of the recess 18. ), A step portion 13b (in a region surrounded by a broken line) and a step portion 13c (in a region surrounded by a broken line).
- the step portion 13a and the step portion 13b oppose each other with the end portion 12a of the coil element 12 and the projection portion 17 therebetween.
- the step portion 13 c is provided in a region obtained by extending the region sandwiched between the slit 14 and the slit 15 in the extending direction of the end 12 a of the coil element 12.
- the recessed part 18 can be easily formed by the slit 14, the slit 15 and the slit 16 passing through the step part 13a, the step part 13b and the step part 13c, respectively.
- FIG. 8 is a perspective view of the coil component 10b according to the third embodiment.
- the broken line in FIG. 8 shows the outline of the magnetic core 11.
- FIG. 9 is a side view showing the vicinity of the holding member 13 of FIG. 8 and 9, the same reference numerals are assigned to the same portions as those of the coil components 10 and 10 a in the first and second embodiments.
- the coil component 10b in the third embodiment is different from the coil component 10a in the second embodiment in that the widths of the slit 14 and the slit 15 in the direction perpendicular to the direction in which the slit 14 and the slit 15 extend are different depending on the part.
- both ends 14a and 14b of the slit 14 in the direction 23 in which the slit 14 extends elongated one end having a short distance from the position P1 (see FIGS. 9 and 3) where the end 12a of the coil element 12 protrudes from the magnetic core 11
- the width of the slit 14 of 14a is larger than the width of the slit 14 of the other end part 14b far from the one end part 14a.
- the slit 14 has an end portion 14a having a larger width than the end portion 14b.
- the distance between the position P1 where the end 12a of the coil element 12 protrudes from the magnetic core 11 and the end 14b is larger than the distance between the position P1 and the end 14a.
- the width of the slit 14 is monotonously increased from the other end portion 14b to the one end portion 14a so that the solder can easily enter the slit 14 and the strength of the terminal portion 20 is increased. can do.
- the width of the slit 14 at one end 14a that is close to the position P1 at which the end 12a of the coil element 12 protrudes from the magnetic core 11 is 0.3 mm, and the slit at the other end 14b.
- the width of 14 is 0.2 mm.
- the slit 15 has the same configuration as the slit 14.
- the distance from the position P1 where the end 12a of the coil element 12 protrudes from the magnetic core 11 is short.
- the width of the slit 15 at the end 15a is larger than the width of the slit 15 at the other end 15b, which is farther from the first end 15a than the distance from P1.
- the slit 15 has an end portion 15a having a larger width than the end portion 15b.
- the distance between the position P1 where the end 12a of the coil element 12 protrudes from the magnetic core 11 and the end 15b is larger than the distance between the position P1 and the end 15a.
- the width of the slit 15 is monotonously increased from the other end portion 15b to the one end portion 15a so that solder can easily enter the slit 15 and the strength of the terminal portion 20 is increased. Can be strengthened.
- the width of the slit 15 at one end 15a that is close to the position P1 where the end 12a of the coil element 12 protrudes from the magnetic core 11 is 0.3 mm, and the slit at the other end 15b.
- the width of 15 is 0.2 mm. This makes it easier for solder to enter the slit 15, and the strength of the terminal portion 20 can be increased.
- FIG. 10 is a perspective view of the coil element 12 embedded in the magnetic core 11 of the coil component 10 according to the first embodiment.
- a coil element 12 is prepared in which a copper wire having a diameter of 0.3 mm whose surface is insulated and coated is spirally wound.
- the two end portions 12a of the coil element 12 extend in opposite directions.
- the end portion 12a of the coil element 12 is peeled off in advance before being electrically connected to the holding member 13.
- the end 12a of the coil element 12 is pressed into a flat shape, and the thickness in the pressing direction is about 0.2 mm.
- FIG. 11 is a perspective view of the holding member 13 connected to the hoop.
- the holding member 13 connected to the hoop is prepared by punching a copper plate with a metal mold.
- the holding member 13 is formed by pressing the recessed portion 18 having a depth of about 0.2 mm and recessed from the main surface 113a of the holding member 13.
- the projecting portion 17 is formed on the bottom surface 22 of the recessed portion 18 by embossing from the back side of the bottom surface 22 of the recessed portion 18.
- the protrusion 17 has a linear shape that intersects with the end 12a of the coil element 12 at a height of 0.1 mm from the bottom surface 22 of the recess 18.
- the protrusion 17 can also be formed by pressing simultaneously with the recess 18.
- a groove 17a (see FIGS. 1 and 2) that is linearly recessed is formed on the back side of the protrusion 17 by the above-described embossing. Further, at both ends of the opposite end portions of the two holding members 13, a protruding portion 21 a and a protruding portion 21 b are provided on one holding member 13, and a protruding portion 21 c and a protruding portion 21 d are provided on the other holding member 13. Is provided.
- the protrusion 21a, the protrusion 21b, the protrusion 21c, and the protrusion 21d are embedded and fixed in the magnetic core 11 when the magnetic core 11 described later is re-pressurized.
- FIG. 12 is a perspective view of the coil element 12 having an end 12a fixed to the holding member 13 shown in FIG.
- the end 12a of the coil element 12 is placed in the recess 18, the end 12a of the coil element 12 and the protrusion 17 are crossed and overlapped, and the coil element 12 is welded by electrical resistance welding. Fix to the holding member 13.
- FIG. 13 is a perspective view of the magnetic core 11 in which the protruding portion 21a, the protruding portion 21b, the protruding portion 21c, and the protruding portion 21d formed in the coil element 12 and the two holding members 13 shown in FIG. 12 are embedded.
- the outline of the magnetic core 11 is indicated by a broken line. A method for manufacturing the magnetic core 11 will be described.
- a mixed material obtained by mixing a binder containing a thermosetting resin and a metal magnetic powder is prepared.
- the mixed material is dried so that the thermosetting resin is not completely cured, and then the mixed material is pulverized to obtain a powdered magnetic material.
- This magnetic material is pressure-molded at about 1 ton / cm 2 to form and prepare a green compact 19a and a green compact 19b shown in FIG.
- the green compact 19a and the green compact 19b are overlapped with the two green compacts 19a and 19b so as to sandwich the coil element 12 and the protrusion 21 shown in FIG. To.
- This re-press molding is about 5 ton / cm 2 .
- the magnetic core 11 shown by the broken line in FIG. 13 is formed.
- a coil element 12, a protruding portion 21a, a protruding portion 21b, a protruding portion 21c, and a protruding portion 21d are embedded in the magnetic core 11.
- the magnetic core 11 is heated at 180 ° C. to completely cure the thermosetting resin contained in the green compacts 19a and 19b of the material of the magnetic core 11.
- FIG. 14 is a perspective view after the holding member 13 shown in FIG. 13 is separated from the hoop.
- a broken line shows the outline of the magnetic core 11.
- the two holding members 13 fixed to the magnetic core 11 are separated from the hoop and separated into pieces, and the holding member 13 and the end portion 12a of the coil element 12 are coated with a flux and solder dipped to hold the holding member 13. And the end 12a of the coil element 12 are connected by solder.
- the coil component 10 can be obtained through the above steps.
- FIG. 15 is a perspective view of the coil component 10 in which the two holding members 13 of FIG. 14 extend along two side surfaces of the magnetic core 11 and are bent to the bottom surface of the coil component 10, respectively.
- the individual holding member 13 shown in FIG. 14 is cut by a predetermined length, and the back side of the bottom surface 22 of the recess 18 is bent along the side surface of the magnetic core 11.
- the holding member 13 is bent toward the bottom surface of the magnetic core 11 to obtain the coil component 10 shown in FIG.
- a recess for fitting the recess 18 of the holding member 13 may be formed on the side surface of the magnetic core 11.
- the difference between the manufacturing method of the first embodiment and the manufacturing method of the second embodiment is the presence or absence of a slit provided in the holding member 13.
- FIG. 16 is a perspective view of the holding member 13 in which the slits 14, 15, and 16 are provided in the holding member 13 of FIG.
- the holding member 13 in the second embodiment is provided with slits 14 and 15 with the end 12 a of the coil element 12 and the protrusion 17 interposed therebetween. Further, a slit 16 is provided in a region obtained by extending a region sandwiched between the slit 14 and the slit 15 in the extending direction of the end 12 a of the coil element 12.
- the slits 14, 15 and 16 can be formed by punching the holding member 13 connected to the hoop shown in FIG.
- the slit 14 can be formed through the stepped portion 13a, the slit 15 can be formed through the stepped portion 13b, and the slit 16 can be formed through the stepped portion 13c, whereby the recessed portion 18 can be easily formed. it can.
- the coil component 10b of Embodiment 3 shown in FIG. 8 is appropriately punched when the holding member 13 connected to the hoop is punched in the method of manufacturing the coil component 10a of Embodiment 2 shown in FIG. It can be formed by adjusting the shape of the slit.
- the coil component according to the present invention is miniaturized, the clearance between the mold and the holding member can be reduced, and the coil component is useful as a coil component with good mass productivity.
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- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Coils Or Transformers For Communication (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
図1は実施の形態1におけるコイル部品10の分解斜視図である。
図6は実施の形態2におけるコイル部品10aの透視斜視図である。図6の破線は磁心11の輪郭を示す。図7は図6の保持部材13の近傍を示す側面図である。
図8は実施の形態3におけるコイル部品10bの透視斜視図である。図8の破線は磁心11の輪郭を示す。図9は図8の保持部材13の近傍を示す側面図である。なお、図8と図9において、実施の形態1および実施の形態2におけるコイル部品10、10aと同じ部分には同じ参照番号を付す。実施の形態3におけるコイル部品10bはスリット14とスリット15が延伸する方向と直角の方向におけるスリット14とスリット15の幅が部位によって異なる点が実施の形態2のコイル部品10aと異なる。
次に図2に示す実施の形態1におけるコイル部品10の製造方法について説明する。
次に図6に示す実施の形態2におけるコイル部品10aの製造方法について説明する。
11 磁心
12 コイル素子
12a コイル素子の端部
13 保持部材
13a 段差部(第1の段差部)
13b 段差部(第2の段差部)
13c 段差部(第3の段差部)
14 スリット(第1のスリット)
14a 端部(第2の部分)
14b 端部(第1の部分)
15 スリット(第2のスリット)
15a 端部(第4の部分)
15b 端部(第3の部分)
16 スリット(第3のスリット)
17 突起部
17a 溝部
18 凹み部
19a 圧粉体
19b 圧粉体
20 端子部
21a 突出部
21b 突出部
21c 突出部
21d 突出部
22 底面
Claims (14)
- 磁性体粉末を含有する磁心と、
前記磁心から突出して端部を有し、前記磁心に埋設されたコイル素子と、
前記コイル素子の前記端部を保持する保持部材と、
を備え、
前記保持部材は、前記磁心に向かって凹んでいる凹み部が設けられている主面を有し、
前記保持部材は、前記凹み部の底面から突出して前記底面に沿って直線状に延びる突起部を有し、
前記突起部は、前記コイル素子の前記端部と交差する部分を有し、前記突起部の前記部分で前記コイル素子の前記端部に溶接されている、コイル部品。 - 前記突起部は、前記凹み部の中に設けられている、請求項1記載のコイル部品。
- 前記保持部材には、前記コイル素子の前記端部と前記突起部とを間にして配置された第1のスリットと第2のスリットとが設けられている請求項1記載のコイル部品。
- 前記第1のスリットは、前記凹み部の前記保持部材の前記主面と前記底面に接続された第1の段差部を通るように設けられ、前記第2のスリットは、前記凹み部の前記保持部材の前記主面と前記底面に接続された第2の段差部を通るように設けられている請求項3記載のコイル部品。
- 前記第1のスリットは、第1の幅を有する第1の部分と、前記第1の幅より大きい第2の幅を有する第2の部分を有し、
前記コイル素子の前記端部が前記磁心から突出した位置と前記第1のスリットの前記第1の部分との距離は、前記位置と前記第1のスリットの前記第2の部分との距離よりも大きく、
前記第2のスリットは、第3の幅を有する第3の部分と、前記第3の幅より大きい第4の幅を有する第4の部分を有し、
前記位置と前記第2のスリットの前記第3の部分との距離は、前記位置と前記第2のスリットの前記第4の部分との距離よりも大きい、請求項3記載のコイル部品。 - 前記第1のスリットの前記第1の部分は前記第1のスリットの両端部の一方の端部であり、前記第2の部分は前記第1のスリットの前記両端部の他方の端部であり、
前記第1のスリットの幅は、前記第1の部分から前記第2の部分まで単調に大きくなり、
前記第2のスリットの前記第3の部分は前記第2のスリットの両端部の一方の端部であり、
前記第4の部分は前記第2のスリットの前記両端部の他方の端部であり、
前記第2のスリットの幅は、前記第3の部分から前記第4の部分まで単調に大きくなる、請求項5に記載のコイル部品。 - 前記保持部材には、前記第1のスリットと前記第2のスリットに挟まれた領域を前記コイル素子の前記端部の延伸方向に延ばした領域の中に第3のスリットが設けられている請求項3記載のコイル部品。
- 前記第3のスリットは、前記凹み部の前記保持部材の前記主面と前記底面に接続された第3の段差部を通るように設けられている請求項7記載のコイル部品。
- 端部を有する巻回された導線よりなるコイル素子を準備するステップと、
凹み部を有する金属平板よりなり、前記凹み部の底面から突出して前記底面に沿って直線状に延びる突起部を有する保持部材を準備するステップと、
前記突起部が前記コイル素子の前記端部と交差する部分を有するように、前記保持部材と前記コイル素子とを配置するステップと、
前記突起部の前記部分と前記コイル素子の前記端部とを溶接するステップと、
磁性材料からなり、前記コイル素子を埋め込んだ磁心を加圧成形するステップと、
を含む、コイル部品の製造方法。 - 前記保持部材を折り曲げるステップをさらに含む、請求項9記載のコイル部品の製造方法。
- 前記保持部材には、前記コイル素子の前記端部と前記突起部とを間にして配置された第1のスリットと第2のスリットが設けられている、請求項9記載のコイル部品の製造方法。
- 前記第1のスリットは、前記凹み部の前記保持部材の前記主面と前記底面に接続された第1の段差部を通るように設けられ、前記第2のスリットは、前記凹み部の前記保持部材の前記主面と前記底面に接続された第2の段差部を通るように設けられている、請求項11記載のコイル部品の製造方法。
- 前記保持部材は、前記第1のスリットと前記第2のスリットに挟まれた領域を前記コイル素子の前記端部の延伸方向に延ばした領域の中に第3のスリットが設けられている、請求項11記載のコイル部品の製造方法。
- 前記第3のスリットは、前記凹み部の前記保持部材の前記主面と前記底面に接続された第3の段差部を通るように設けられている、請求項13記載のコイル部品の製造方法。
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