WO2005045858A1 - コイル装置 - Google Patents
コイル装置 Download PDFInfo
- Publication number
- WO2005045858A1 WO2005045858A1 PCT/JP2004/016425 JP2004016425W WO2005045858A1 WO 2005045858 A1 WO2005045858 A1 WO 2005045858A1 JP 2004016425 W JP2004016425 W JP 2004016425W WO 2005045858 A1 WO2005045858 A1 WO 2005045858A1
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- WO
- WIPO (PCT)
- Prior art keywords
- coil
- core
- winding
- coil device
- portions
- Prior art date
Links
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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
- H01F27/292—Surface mounted devices
-
- 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
- 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
- H01F41/06—Coil winding
- H01F41/082—Devices for guiding or positioning the winding material on the former
-
- 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
- H01F27/02—Casings
- H01F27/027—Casings specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
-
- 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
- H01F27/33—Arrangements for noise damping
Definitions
- the coil device is made of a thermosetting resin such as an epoxy resin.
- the thickness of the insulation coating becomes relatively thin, and the whole or part of the core and coil is exposed to the outside, ensuring the impact resistance, vibration resistance, durability, etc., which are the purpose of the insulation coating. No longer.
- the core size force will decrease, and the electrical characteristics will be sacrificed .
- an important issue is how to increase the core size and ensure high electrical characteristics without impairing the impact resistance, vibration resistance, and durability of the insulation coating. become.
- the boundary end surface of the second coil portion on the side of the first coil portion is formed so that the outer peripheral side is closer to the first coil portion than the inner peripheral side, the winding area of the winding Can be secured effectively.
- the boundary end face of the second coil section on the first coil section side is formed on the boundary end face of the second coil section.
- One end of the mounting portion is fixed to the terminal mounting portion of the core.
- One end of the intermediate portion is continuous with the other end of the attachment portion at a bent portion.
- One end of the bottom portion is continuous with the other end of the intermediate portion at the bent portion, faces the mounting portion, and the other end is a free end.
- the intermediate portion is a portion facing the end face of the core, and has a relation in which the plate surface is orthogonal or intersects with the magnetic flux due to the current flowing through the coil. For this reason, it becomes an obstacle that hinders the smooth flow of magnetic flux, and degrades the frequency inductance characteristic and the frequency Q characteristic. Therefore, in the present invention, a hole is provided in the plane of the intermediate portion.
- the holes are arranged so as to be offset in the direction of the mounting portion. According to this arrangement, the space for forming the solder fillet can be increased below and beside the hole.
- the coil device according to the present invention may include the following technical features in addition to the technical features of the first aspect described above.
- the bulging portion of the winding core portion is formed of a curved line in a cross section orthogonal to the coil winding axis direction.
- the outer peripheral surface of the core portion and the surface of the flange portion on the side of the core portion is R-processed or tapered, and Z or the core portion in the flange portion is provided.
- the inner surface and the outer peripheral surface on the radially outer side are rounded.
- the winding of the coil when the winding of the coil is wound around the winding core, the winding does not have a bulging portion. It is more circular and wound into a shape. Therefore, even if the coil expands due to the heat generated during molding of the insulating sheath, stress concentration is reduced at the portion of the insulating sheath covering the winding at the corner of the winding core portion, and the portion is relaxed. The occurrence of cracks can be prevented.
- the bulging portion is formed on a pair of opposing surfaces in the quadrangular shape in the cross-sectional shape of the winding core portion, it is possible to prevent the occurrence of cracks in the insulating sheath as described above, and to reduce the size of the coil device. Can meet the demands of
- connection portion between the core portion and the flange portion, and Z or an outer peripheral surface of the flange portion and a side surface of the core portion. If the connection part is subjected to a rounding process that is larger than naturally occurring in processing, cracks may occur at the boundary between the core and the flange, and cracks or chips may occur in the flange. Can be prevented.
- the coil device according to the present invention may include the following technical features in addition to the technical features of the first aspect described above.
- the coil device according to the present invention further includes an insulating cover.
- the core includes a coil winding, and the coil winding extends in a longitudinal direction.
- the insulating cover is made of a thermoplastic insulating resin and covers the core and the coil. The core and the coil are positioned substantially at the center of the insulating cover.
- the coil device according to the present invention includes the insulating coating, and the insulating coating covers the core and the coil. According to this structure, the core and the coil are protected by the insulating cover, and a highly reliable coil device can be realized.
- the insulating covering is made of a thermoplastic insulating resin.
- the insulating cover is made of a thermoplastic insulating resin material, the amount of change in the inductance value due to temperature fluctuation can be reduced as compared with the case where the insulating coating is made of a thermosetting insulating resin material. This is because the effect of the thermal expansion and shrinkage of the insulating coating on the core is reduced when the insulating coating is made of a thermoplastic insulating resin material than when it is made of a thermosetting resin material. This is presumed to be due to the fact that the thermal stress of the core is reduced, and the magnetic properties inherent to the core can be exhibited.
- the insulating cover is preferably made of a liquid crystal polymer.
- the coil device according to the present invention may include the following technical features in addition to the technical features of the first aspect described above.
- the coil device further includes an insulating resin exterior body and a terminal.
- the core is a rod-shaped body extending in one direction, and has a winding portion at an intermediate portion.
- the coil is configured by a winding wound around the winding portion.
- the insulating resin exterior body covers at least a part of the winding.
- the terminal is a portion for connecting a terminal of the winding, and is formed of a single metal plate. One end is fixed to the terminal attaching portion of the core, and a bent portion is provided between the one end and the other end. And the bent portion is outside the insulating resin exterior body. Furthermore, at least a part of the surface of the insulating resin exterior body is roughened.
- the insulating resin sheath covers at least a part of the winding, so that the winding is protected by the insulating resin sheath, and the shock resistance, vibration resistance, and the like are obtained. It is possible to realize an excellent coil device.
- the insulated resin exterior body is not limited to a part of the winding, but can cover the whole, and further, a part or the whole of the core.
- the coating mode may be appropriately determined depending on the purpose of use and the environment of use.
- the terminal for connecting the terminal of the winding is made of a single metal plate, one end is fixed to the terminal mounting portion of the core, and has a bent portion between one end and the other end. Since the portion is located outside the insulating resin exterior body, when the coil device is mounted on a substrate or the like, the panel can be secured by the bent portion and shock and vibration can be absorbed. For this reason, a coil device excellent in shock resistance, vibration resistance, and the like can be realized.
- At least a part of the surface of the insulating resin exterior body is roughened.
- a typical example of the roughening is a so-called "texturing".
- the surface of the insulating resin exterior body is roughened, the roughened surface
- the surface area of the insulating resin outer package increases depending on the product area, the nature of the surface roughening, and the like. For this reason, the heat radiation area is enlarged and the heat radiation is promoted, so that the thermal stability of the characteristics is improved.
- the surface roughening is performed over the entire surface of the insulating resin outer package, but it may be partial.
- the coil device according to the present invention can be used in various fields. Specific examples of applications may include antennas, especially antennas or transbonders for on-vehicle devices, or inductors or choke coils for electronic equipment.
- a coil device can be provided.
- FIG. 1 is a longitudinal sectional view of a coil device according to an embodiment of the present invention.
- FIG. 2 is a perspective view of a ferrite core in the coil device.
- FIG. 3 is a side view of a ferrite core in the coil device.
- FIG. 6 is a diagram showing a configuration of a coil according to another embodiment of the present invention.
- FIG. 7 is a perspective view of a coil device according to still another embodiment of the present invention.
- FIG. 8 is a front sectional view of the coil device shown in FIG. 7.
- FIG. 9 is an enlarged perspective view showing a part of the coil device shown in FIGS. 7 and 8.
- FIG. 10 is a view showing a use state of the coil device shown in FIGS. 7 to 9.
- FIG. 11 is a perspective view showing another embodiment of the terminal used in the coil device according to the present invention.
- FIG. 12 is a perspective view showing still another form of the terminal used in the coil device according to the present invention.
- FIG. 13 is a perspective view showing still another form of the terminal used in the coil device according to the present invention.
- FIG. 14 is a perspective view showing still another form of the terminal used in the coil device according to the present invention.
- FIG. 15 is a perspective view showing still another form of the terminal used in the coil device according to the present invention.
- FIG. 16 is a development view of the terminal shown in FIGS. 14 and 15.
- FIG. 17 is a cross-sectional view of a coil device according to still another embodiment of the present invention.
- FIG. 18 is a longitudinal sectional view of a coil device according to still another embodiment of the present invention.
- FIG. 19 is a perspective view of a ferrite core in the coil device.
- FIG. 20 is a side view of a ferrite core in the coil device.
- FIG. 21 is a cross-sectional view taken along line 21-21 of FIG.
- FIG. 22 is a sectional view of a coil device according to still another embodiment of the present invention.
- FIG. 23 is a perspective view showing a state before bending the terminal in the coil device shown in FIG. 22.
- Fig. 24 is a diagram illustrating a molding step of an insulating cover made of a thermoplastic resin.
- FIG. 25 is a diagram showing temperature-L change rate characteristic data.
- FIG. 26 is an external perspective view of a coil device according to still another embodiment of the present invention.
- FIG. 28 is a front sectional view of the coil device shown in FIGS. 26 and 27.
- FIG. 29 is a view showing a use state of the coil device shown in FIGS. 26 to 28.
- FIG. 30 is a cross-sectional view of a coil device according to still another embodiment of the present invention.
- FIG. 1 shows a longitudinal section of the coil device according to the present embodiment.
- the coil 505 is also a winding wire wound around the ferrite core 503 on the outer peripheral surface of the ferrite core 503.
- the insulating sheath 507 is provided so as to cover the entire surface of the ferrite core 503 and the coil 505.
- Ferrite core 503 can be obtained by a sintered body of ferrite powder, a mechanical ferrite rod, or a combination of both. As shown in FIGS. 2 and 3, the ferrite core 503 is a substantially rod-shaped member and has flanges 513 and 515 at both ends in the longitudinal direction (X direction). , 515 have a core 517. [0080] The pair of flanges 513 and 515 and the core 517 have a rectangular cross section having a dimension in the Y direction with respect to the dimension in the Z direction. Further, the pair of flange portions 513 and 515 and the core portion 517 are formed to have the same width dimension (dimension in the Y direction) in the longitudinal direction of the core.
- the pair of flange portions 513 and 515 are formed so as to be thicker than the core portion 517.
- the surfaces 513a and 515a of the pair of flanges 513 and 515 facing the center in the longitudinal direction of the core are respectively provided so as to rise substantially vertically from the upper and lower surfaces of the core 517.
- a pair of V-shaped grooves 519 and 521 are formed in the surfaces 513a and 515a of the pair of binding members 13 and 515 and the surfaces 513b and 515b of the inverted Tsukuda J.
- the pair of grooves 519 and 521 extend along the Y direction, and open at both end surfaces of the ferrite core 503 in the Y direction.
- a pair of corresponding terminals 509, 511 is engaged with the pair of grooves 519, 521 described above.
- the pair of terminals 509 and 511 are metal plate-like members bent substantially in a U-shape when viewed in a ZX longitudinal section. More specifically, a non-magnetic and panel-like material such as a phosphor bronze plate or a stainless steel plate such as SUS304-CSP can be used.
- the pair of terminals 509 and 511 have three flat portions formed by bending the plate-like member at two locations.
- the first portion 523, 525 and the third portion 531, 533 of the three plane portions extend along the ⁇ plane, and extend to the second portion 527, 529, ⁇ the plane. Extending.
- the first portions 523 and 525 pass through the insulating sheath 507.
- One end of each of the first portions 523 and 525 is inserted into a corresponding pair of grooves 519 and 521, and is fixed by an adhesive 535.
- the winding ends 537 of the coil 505 are joined to the first portions 523 and 525 by soldering.
- the other ends of the first portions 523, 525 are connected to the first curved portion 539.
- the second portions 527 and 529 extend between the first curved portion 539 and the second curved portion 541.
- a through hole 543 is formed in the second portions 527 and 529 so that the cross-sectional area of the second portions 527 and 529 is smaller than that of the first portions 523 and 525 and the third portions 531 and 533.
- the third portions 531 and 533 extend from the second curved portion 541 toward the center in the longitudinal direction of the core and substantially parallel to the lower surface of the insulating outer body 507.
- the insulating sheath 507 is a substantially rectangular parallelepiped that covers the flight core 503 and the coil 505. -Shaped member.
- the ferrite core 503 and the coil 505 are protected by the strong insulating sheath 507, and the bonding strength of the pair of terminals 509 and 511 to the ferrite core 503 is improved, thereby realizing an aspect with excellent mechanical reliability. Can be.
- the coil 505 is an outer peripheral surface of the core 517 of the ferrite core 503, and is disposed between the pair of surfaces 513a and 515a. Further, in the present embodiment, coil 505 has first coil portion 551 and second coil portion 553. Each of the first coil portion 551 and the second coil portion 553 is formed by winding a winding 555 around a ferrite core 503 in a predetermined range in the longitudinal direction of the core and laminating the winding.
- the winding 555 uses a urethane wire.
- Urethane wire is a wire that does not have a cement coating such as a so-called cement-coated wire.
- the boundary end surface CF of the first coil portion 551 on the side of the second coil portion 553 extends in the direction of the axis of the ferrite core 503 or in a direction perpendicular to the outer peripheral surface. It is inclined so as to be closer to the second coil portion 553 than the outer peripheral side. Also, the boundary end face CF of the second coil part 553 on the first coil part 551 side is along the boundary end face CF.
- the end surface TF of the first coil portion 551 on the side opposite to the second coil portion 553 also extends in a direction perpendicular to the axial direction of the ferrite core 503 and the outer peripheral surface.
- the outer peripheral side of the end face is inclined so as to be farther from the flange 513 than the inner peripheral side.
- the end surface TF of the second coil portion 553 on the opposite side to the first coil portion 551 is also similar to the end surface TF,
- the outer peripheral side of the end face is inclined so as to be farther from the flange 515 than the inner peripheral side.
- the end faces TF and TF on the side of the pair of flange portions 513 and 515 are inclined, so that both ends of the coil 505 and the pair of flange portions 51 are formed.
- a method of manufacturing the coil device 501 having the above configuration will be described.
- a pair of corresponding terminals 509 and 511 are connected and fixed to a pair of gold terminals 513 and 515 in the ferrite core 503 by an adhesive 535.
- one winding terminal 537 of winding 555 After soldering to the terminal 509, the winding 555 is wound around the winding core 517 of the ferrite core 503 to form the coil 505.
- Winding uses a flyer winding method in which a nozzle is rotated around a core that is stationary and fixed.
- the formation of the coil 505 is performed in a divided winding manner, that is, in a manner of forming the second coil part 553 after the formation of the first coil part 551 is completed.
- one winding terminal 537 of the winding 555 is soldered to the terminal 511, and after washing and drying steps, the ferrite core 503 and the coil 505 are formed in the molding step. Is covered with an insulating sheath 507.
- the winding 555 is formed on the ferrite core 503 from a corner located between the surface 513a of the flange 513 on the left side and the winding core 517 in FIG. 5 forming the first coil portion 551 of the coil 505. Winding up.
- the winding position of the winding 555 is advanced toward the right side flange 515 along the outer peripheral surface of the winding core 517 as shown by an arrow in the figure, and the winding 555 is formed as a first layer. After winding around 100 turns, it is folded back and wound as a second layer toward the left flange 513. Similarly, thereafter, the winding position is advanced toward the right flange 515 to form a third layer, and the winding is turned back toward the left flange 513 to form a fourth layer.
- the sixth, seventh, eighth, and ninth layers are sequentially laminated.
- the first coil portion 551 and the second coil portion 553 each have a nine-layer configuration. The present invention is not limited to this. Is possible.
- the winding position of the winding 555 is reciprocated within a predetermined range, thereby forming the first coil portion 551 in which the winding 555 is laminated in the radial direction of the ferrite core 503.
- the number of turns per layer is reduced in the upper layer, that is, the layer on the radially outer side.
- the boundary end surface CF of the first coil portion 551 is formed to be inclined in the above-described direction.
- the second coil portion 553 is formed.
- the boundary end face CF of the second coil part 553 is formed so as to be placed on the boundary end face CF of the first coil part 551.
- the winding position of the winding 555 is The first coil portion 551 is advanced from the uppermost layer to the outer peripheral surface of the core portion 517. Then, as the first layer in the second coil portion 553, the winding position of the winding 555 is advanced toward the right flange portion 515 along the outer peripheral surface of the winding core portion 517, and after winding around 100 turns, Then, it is folded and wound as a second layer toward the left flange 513. Similarly, thereafter, the winding position is advanced toward the right flange 515 to form a third layer, and is turned back.Then, the winding position is advanced toward the left flange 513 to form a fourth layer.
- the sixth, seventh, eighth, and ninth layers are sequentially formed.
- the second coil portion 553 is similarly formed by reciprocating the winding position of the winding 555 within a predetermined range and stacking the winding 555 in the radial direction of the ferrite core 503.
- the boundary end surface CF of the first coil portion 551 formed earlier is inclined, a wire having no cement coating such as urethane wire is used. Also, it is possible to prevent the winding from collapsing.
- the boundary end surface CF of the first coil portion 551 has a laminated structure in which the closer to the upper layer (the outer layer), the closer to the center of the winding portion, so that the space on the second coil portion 553 side is limited. Even if there is no support such as a flange, the seating of the winding wire does not collapse. In FIGS.
- first coil portion 551 and the second coil portion 553 are illustrated as being separated from each other. As shown in the partial view of the two-dot chain line in Fig. 5, the boundary between the two coil parts The portion is formed with almost no gap as in one coil portion.
- the coil device 501 of the present embodiment when the coil is formed in the split winding mode, the coil is formed before the ferrite core 503 is provided with a support such as a flange. It is possible to prevent the winding of the coil portion from being broken during the formation of the next coil portion. For this reason, the flange can be omitted in the split winding mode, and the ferrite core 503 can be reduced in size.
- the ferrite core 503 is configured to have the same overall length as the existing ferrite core for split winding having a flange, it is possible to wind as many windings as the flange is omitted.
- a uniform winding core 517 can be formed between the pair of flanges 513 and 515, so that the form of the ferrite core 503 can be simplified, and the core manufacturing process can be simplified. Costs can be reduced.
- coil 505 in the split winding mode can have a peak of inductance at a higher frequency. Therefore, a region where the rate of change of the inductance with respect to the frequency is small can be provided in a wider frequency range, and it is easy to stabilize the inductance in a use frequency range desired by the customer.
- the area between the flanges 513 and 515 can be effectively used as a winding area.
- the end surface of the coil portion (including the flange portion side and the other coil portion side) of the coil 505 is not limited to a mode in which the coil 505 is accurately shifted and inclined by one winding for each layer. Absent . In other words, it is sufficient that a constant inclination relationship is secured between the outer peripheral side and the inner peripheral side of the coil part. Therefore, the end face of the coil part is, for example, inclined stepwise or irregular. The winding position may be shifted and inclined in this manner.
- Fig. 14 is a diagram showing another example of the terminal, in which the terminals 151 and 152 are connected from the middle parts 912 and 922 to the bottom part.
- each of the pair of flanges 213 and 215 and the core 217 has a dimension in the Y direction larger than that in the Z direction. Further, the pair of flange portions 213 and 215 are formed to have a dimension in the Z direction and a dimension in the Y direction larger than the core portion 217, respectively. As a result, the pair of gold cores 213 and 215 have forces 213a and 215a, respectively, which rise almost vertically from the upper and lower surfaces and both side surfaces of the core. .
- the X dimension of the core 217 is 7 mm; the X dimension of the flanges 213 and 215 is 1.3 mm; The rising dimension in the Z direction from the core 217 on the core side surfaces 213a and 215a is 0.5 mm.
- the connection part 275 is rounded, the radius of the R corner at the connection parts 275 and 277 is 0.215 mm.
- the radius of the natural R generated naturally in the processing before performing the R processing according to the present embodiment is about 0.05-0.07 mm. Therefore, the radius of the rounded portion of the joints 275 and 277 is about 2-3 times the natural radius.
- the connection part 275 is tapered, the inclination angle ⁇ of the tapered part of the connection part 275 is set to 30-60 ° with respect to the winding axis C of the core part 217.
- the winding core portion 217 of the ferrite core 203 is manufactured in a well-known mode, that is, by press molding by compressing ferrite powder. Press molding is performed using a pair of frame molds, an upper mold and a lower mold. A pair of frame molds is arranged at a predetermined interval, and ferrite powder is filled between a pair of strong frame molds, and the powder is inserted between the pair of frame molds from above and below. Compression molding is performed using a mold and a lower mold.
- the upper surface 261 and the lower surface 263 of the core part 217 are formed by a pair of frame molds, and the pair of side surfaces 265 and 267 of the core part 217 are formed by an upper mold and a lower mold.
- the bulging portion 269 partially bulges on the side surfaces 265 and 267, that is, the flat portions 271 are formed on both sides of the bulging portion 269. Therefore, the frame mold and the upper mold and the lower mold are in contact at almost right angle. Therefore, it is possible to prevent a large compression reaction force from acting on the end of the mold. Therefore, a sufficient compressive force can be applied, and damage to the mold in a short period of time can be prevented.
- connection ⁇ 275 between the upper surface 261 of the core part 217 and the core part side surfaces 213a, 215a of the flange parts 213, 215, and the core characteristic surface 213a, 215a of the gold ⁇ , 213, 215 The connection portion 277 with the upper surfaces 213c and 215c is provided with a larger R-force than that naturally occurring in processing. Accordingly, it is possible to prevent a crack from being generated at the boundary between the core 217 and the flanges 213 and 215, and to prevent the flanges 213 and 215 from being cracked or chipped.
- the cross sections of the flange portions 321 and 322 at positions where the grooves 331 and 332 do not exist are square cross sections. It is preferable that the outer edge portion and the inner corner portion of the collar portions 321 and 322 are rounded or slightly chamfered.
- the grooves 331 and 332 are narrowed toward the bottom, so that each of the terminals 351 and 352 is positioned inside the grooves 331 and 332 at a fixed position determined by the plate thickness. Is done. Therefore, the positional force of the terminals 351 and 352 with respect to the core 301 is uniquely determined, and the fluctuation of the frequency inductance characteristic and the fluctuation of the frequency Q characteristic due to the positional fluctuation of the terminals 351 and 352 do not occur.
- FIG. 24 is a diagram showing a molding process suitable for positioning the core 301 and the coil 304 at substantially the center of the insulating cover 307.
- protrusions Al and B1 having substantially the same height are provided in the cavities of the lower die A and the upper die B, and the cores 301 and 301 are provided by the protrusions Al and B1.
- the coil 304 is accurately positioned at a predetermined position inside the lower die A and the upper die B. It is preferable that the tips of the projections Al and B1 are slightly separated from the surface force of the core 301 by the tip. As a result, the core 301 and the coil 304 are positioned substantially at the center of the insulating coating, and are completely covered by the insulating coating 307 that is not exposed to the outside from the insulating coating 307.
- the temperature-to-L change rate characteristic is significantly larger than reference characteristic curve Cr. Diverge.
- the coil device according to the present invention exhibits a temperature-to-L rate-of-change characteristic that is extremely close to the reference characteristic curve Cr. This is because, when the insulating cover 307 is made of a thermoplastic insulating resin, the influence of the thermal expansion and shrinkage on the core 301 is smaller than when the insulating coating 307 is made of a thermosetting resin (characteristic curve C2). The stress of the core 301 is reduced, It is presumed that the magnetic properties (characteristic curve Cr) originally possessed can be exhibited.
- each configuration described or suggested in the fourth aspect of the invention> can be combined with any configuration described or suggested in the first aspect of the invention>.
- the coil 304 formed in the coil winding portion 311 of the core 301 any configuration, arrangement, shape, or the like described or suggested in the first embodiment of the invention> can be adopted. Specific examples are as follows.
- the coil has a first coil portion and a second coil portion.
- Each of the first and second coil portions is formed by winding and laminating a winding wire around a coil winding portion of a core within a predetermined range in the core longitudinal direction (coil winding axis direction).
- the boundary end surface of the first coil portion on the side of the second coil portion is inclined such that the inner peripheral side is closer to the second coil portion than the outer peripheral side.
- the coiling device includes a core 410, a winding 404, terminals 451 and 452, and an insulating resin outer case 407.
- the core 410 has terminal mounting portions 421 and 422 at opposite ends, and a winding portion 401 at an intermediate portion.
- Core 410 is typically a ferrite core, and its material is selected according to required characteristics.
- the ferrite core can be obtained by sintering a ferrite powder, machining a ferrite bar, or a combination of both.
- the winding 404 is wound around the winding 401 of the core 410.
- the number of turns, wire diameter, etc. of the winding 404 differ depending on the coil device to be obtained.
- the terminals 451 and 452 are made of one bent metal plate.
- a metal plate material constituting the terminals 451 and 452 a non-magnetic and panel-like material, for example, a stainless steel metal plate such as a phosphor bronze plate or SUS304 CSP is suitable.
- the second bent portion 4F2 generates the bottom portions 813, 823 that bend in the direction approaching the core 410 along the longitudinal direction X, with the mounting portion 811, 821 force.
- the tips, or free ends, of the bottoms 813, 823 are located outside the outer end face of the core 410 when viewed in the longitudinal direction X. According to this arrangement, frequency-inductance characteristics and frequency-Q characteristics are improved.
- the mounting portions 811 and 821 are further fixed inside the concave portions 431 and 432 by the adhesives 61 and 62 filled in the concave portions 431 and 432, respectively.
- the insulating resin exterior body 407 covers the entire core 410 and the winding 404. Further, the insulating resin exterior body 407 has at least a part of its surface roughened.
- the insulating resin exterior body 407 can be made of epoxy resin or the like.
- FIG. 29 is a cross-sectional view showing a use state of the coil device shown in FIGS. 26 to 28.
- the coil device is used by soldering 484 the bottom portions 813 and 823 to the conductor pattern 482 provided on the circuit board 81.
- the coil device is mounted such that a gap is formed between the lower surface of the insulating sheath 407 and the surface of the circuit board 481.
- the insulating resin exterior body 407 covers the whole of the core 410 and the winding 404, so that the whole of the physically vulnerable core 410 and the winding 404 is insulated. 407 ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ ⁇
- the terminals 451 and 452 for connecting the terminals of the winding 404 are formed of a single metal plate, and one end is fixed to the terminal mounting portions 811 and 821 of the core 410.
- the bending force also has a first bent portion 4F1 and a second bent portion 4F2 between one end and the other end, and the first bent portion 4F1 and the second bent portion 4F2 are insulating resin. It is outside the outer package 407.
- At least a part of the surface of the insulating resin exterior body 407 is roughened.
- a typical example of the roughening is a so-called "texture".
- the surface roughening may be partial, which is ideally over the entire surface of the insulating resin exterior body 407.
- the surface (inner surface) of the mold used for forming the insulating resin exterior body 407 is roughened to 3 to 9 m by grain discharge machining, and then the surface is insulated.
- a method of transferring to the surface of 407 or a method of roughening the surface of the already formed insulating resin exterior body 407 by sandblasting, chemical treatment, or the like can be adopted.
- the intermediate portions 812 and 822 also have holes 814 and 824 in the plane.
- the holes 814, 824 are arcuate at both inner edge forces opposing in at least one direction. Next, this point will be described.
- the intermediate portions 812 and 822 are portions facing the end surface of the core 410, and have a relation in which the plate surface is orthogonal or intersects with the magnetic flux due to the current flowing through the winding 404. For this reason, it becomes an obstacle to hinder the smooth flow of magnetic flux, and may degrade the frequency inductance characteristic and the frequency Q characteristic. Therefore, in the present embodiment, holes 814 and 824 are provided in the plane of the intermediate portions 812 and 822.
- the provision of the mosquitoes 814 and 824 in the intermediate layers 812 and 822 lowers the mechanical strength of the intermediate layers 812 and 822. Reduction in mechanical strength must be minimized. Otherwise, impact resistance and vibration resistance required in applications where the usage environment is severe, such as in-vehicle coil devices, cannot be secured.
- holes 814 and 824 have a shape in which both inner edges facing each other in at least one direction are arc-shaped.
- the holes 814 and 824 are not limited to circular holes, and may be oval holes, elliptical holes, or the like.
- FIG. 30 is a sectional view of a coil device according to still another embodiment of the present invention.
- the core 410 has a partition 423 in the middle and a winding 404 on both sides. That is, the winding portion 401 is divided into a plurality.
- the winding 404 is continuously wound in the same direction in a plurality of winding portions 401. Almost all surfaces of the insulating resin exterior body 407 are roughened. In the case of this embodiment, the same operation and effect as those of the embodiment shown in FIGS.
- each configuration described or suggested in the fifth aspect of the invention can be combined with any configuration described or suggested in the first aspect of the invention.
- core 41 For the coil composed of the winding 404 wound around the zero winding portion 401, any configuration, arrangement, shape, or the like described or suggested in the first embodiment of the invention can be adopted. Specific examples are as follows.
- the coil has a first coil portion and a second coil portion.
- Each of the first and second coil portions is formed by winding a winding around a winding portion of the core in a predetermined range in the longitudinal direction of the core (in the direction of the coil winding axis). Further, the boundary end surface of the first coil portion on the side of the second coil portion is inclined such that the inner peripheral side is closer to the second coil portion than the outer peripheral side.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04818194A EP1688973A4 (en) | 2003-11-05 | 2004-11-05 | COIL DEVICE |
CN2004800323568A CN1875441B (zh) | 2003-11-05 | 2004-11-05 | 线圈装置 |
US10/571,771 US7746207B2 (en) | 2003-11-05 | 2004-11-05 | Coil device |
Applications Claiming Priority (10)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003375434A JP3846798B2 (ja) | 2003-11-05 | 2003-11-05 | コイル装置の製造方法 |
JP2003-375434 | 2003-11-05 | ||
JP2004244279A JP2006066469A (ja) | 2004-08-24 | 2004-08-24 | コイル装置 |
JP2004-244280 | 2004-08-24 | ||
JP2004244280A JP2006066470A (ja) | 2004-08-24 | 2004-08-24 | コイル装置 |
JP2004244278A JP4757466B2 (ja) | 2004-08-24 | 2004-08-24 | コイル装置、及び、コイル装置の製造方法 |
JP2004-244278 | 2004-08-24 | ||
JP2004-244279 | 2004-08-24 | ||
JP2004-245723 | 2004-08-25 | ||
JP2004245723A JP4131515B2 (ja) | 2004-08-25 | 2004-08-25 | コイル装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005045858A1 true WO2005045858A1 (ja) | 2005-05-19 |
Family
ID=34577893
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/016426 WO2005045859A1 (ja) | 2003-11-05 | 2004-11-05 | コイル装置 |
PCT/JP2004/016425 WO2005045858A1 (ja) | 2003-11-05 | 2004-11-05 | コイル装置 |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/016426 WO2005045859A1 (ja) | 2003-11-05 | 2004-11-05 | コイル装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US7746207B2 (ja) |
EP (2) | EP1681691A4 (ja) |
TW (2) | TWI276123B (ja) |
WO (2) | WO2005045859A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1858036A2 (en) * | 2006-05-19 | 2007-11-21 | Toko Kabushiki Kaisha | Miniature surface-mount electronic component and method for manufacturing the same |
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US7551053B2 (en) * | 2003-11-05 | 2009-06-23 | Tdk Corporation | Coil device |
JP4810167B2 (ja) * | 2005-09-12 | 2011-11-09 | スミダコーポレーション株式会社 | インダクタ |
KR101065345B1 (ko) * | 2006-04-07 | 2011-09-20 | 스미다 코포레이션 가부시키가이샤 | 안테나 코일 |
US7656266B2 (en) * | 2008-01-09 | 2010-02-02 | Chang Kern K N | Toroidal star-shaped transformer |
EP2320440B1 (en) | 2009-11-05 | 2013-01-09 | ABB Technology AG | Transformer winding and a method of reinforcing a transformer winding |
DE102010037502A1 (de) * | 2010-09-13 | 2012-03-15 | Hsin-Chen Chen | Drahtgewickelte Drosselspule im Chipformat |
JP5853664B2 (ja) * | 2011-12-16 | 2016-02-09 | スミダコーポレーション株式会社 | コイル部品 |
JP5616928B2 (ja) * | 2012-06-06 | 2014-10-29 | 株式会社エス・エッチ・ティ | コイル装置 |
WO2017130719A1 (ja) * | 2016-01-28 | 2017-08-03 | 株式会社村田製作所 | 表面実装型コイル部品及びその製造方法、並びにdc-dcコンバータ |
JP6465068B2 (ja) * | 2016-04-28 | 2019-02-06 | 株式会社村田製作所 | コイル部品 |
JP6601383B2 (ja) * | 2016-12-26 | 2019-11-06 | 株式会社村田製作所 | インダクタ部品 |
CN108462258A (zh) * | 2018-01-31 | 2018-08-28 | 上海安费诺永亿通讯电子有限公司 | 一种无线充电线圈以及无线充电*** |
JP7176466B2 (ja) * | 2019-04-19 | 2022-11-22 | 株式会社村田製作所 | コイル部品 |
US20220399149A1 (en) * | 2019-12-18 | 2022-12-15 | Permanent Magnets Limited | Magnetic Core Assembly And Manufacturing Process Thereof |
CN113257540A (zh) * | 2020-02-07 | 2021-08-13 | Tdk株式会社 | 复合线圈装置 |
DE102022111363A1 (de) * | 2022-05-06 | 2023-11-09 | Tdk Electronics Ag | Induktives Filterelement |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1858036A2 (en) * | 2006-05-19 | 2007-11-21 | Toko Kabushiki Kaisha | Miniature surface-mount electronic component and method for manufacturing the same |
EP1858036A3 (en) * | 2006-05-19 | 2011-01-26 | Toko, Inc. | Miniature surface-mount electronic component and method for manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
TWI276123B (en) | 2007-03-11 |
TW200519981A (en) | 2005-06-16 |
EP1681691A1 (en) | 2006-07-19 |
US20070046413A1 (en) | 2007-03-01 |
WO2005045859A1 (ja) | 2005-05-19 |
EP1688973A4 (en) | 2010-03-03 |
EP1688973A1 (en) | 2006-08-09 |
TW200523956A (en) | 2005-07-16 |
EP1681691A4 (en) | 2010-03-03 |
US7746207B2 (en) | 2010-06-29 |
TWI276122B (en) | 2007-03-11 |
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