JP5099590B2 - Coil component core member and coil component - Google Patents

Description

  The present invention relates to a coil component core member and a coil component, and more particularly to a coil component core member used for a choke coil, a high frequency coil, and the like, and a coil component having the coil component core member.

As a coil component, one having a configuration including a drum core having a pair of flange portions and a core portion connecting the pair of flange portions is known. A winding made of an insulating coated copper wire is wound around the core of the drum core. A terminal electrode is provided on the collar portion, and one end or the other end of the winding is electrically connected to the terminal electrode and connected. Such a coil component is described in, for example, Japanese Patent Laid-Open No. 9-270316 (Patent Document 1).
JP-A-9-270316

  In portable electronic devices such as mobile phones, thinning and miniaturization have added value to products, and this is the pillar of the design strategy. Thinning and miniaturization of portable electronic devices are directly affected by thinning and miniaturization of electronic components such as coil components mounted on portable electronic devices. Some coil parts cannot be made into chips due to their characteristic requirements and cost merit. Coil components such as choke coils and high frequency coils are one of them. As the core of these coil parts, the above-described drum core is used. Since the drum core has a winding core part and a pair of flange parts, the height of the coil part in the direction connecting the pair of flange parts is unavoidable. There was a problem of getting higher.

  Here, in order to reduce the height of the coil component in the direction connecting the pair of flanges, it is conceivable to shorten the length of the core portion in the same direction. The range in which the value can be adjusted is narrowed, and it becomes difficult to adjust the L value to a desired value. In order to adjust the L value, the number of turns of the winding wound around the core, the thickness of the winding, or the gap between the windings wound around the core is adjusted. However, if the length of the core part in the direction connecting the pair of flanges becomes shorter, the range in which these adjustments can be made becomes smaller. Therefore, it is actually difficult to shorten the length of the core part in the direction connecting the pair of collars.

  Next, it is conceivable to reduce the height of the coil component in the same direction by reducing the thickness of the flange in the direction connecting the pair of flanges. However, since the core part and the collar part are made of ceramics such as magnetic ferrite and non-magnetic ferrite, it is considered that if the collar part is made thin, it becomes brittle and breaks.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a coil component core member that can be reduced in height, easily adjusted in L value, and improved in strength, and a coil component including the coil component core member. And

In order to achieve the above object, the present invention has one end, the other end, and a side surface connecting the one end and the other end, and at least a portion near the one end of the side surface has a plurality of uneven portions, or the rough surface portion possess, or its core portion made of ferrite or a non-magnetic ceramic, a resin, having a fitting surface fitted to the uneven portion or crude surface at near one end portion of at least the mandrel portion A flange portion extending in a direction away from the central axis of the shaft core portion so as to wrap around the side surface, and the contour shape of one end of the shaft core portion is formed at the other end of the shaft core portion. A coil member core member is provided which has substantially the same shape as the contour shape, and one end of the shaft core portion and one surface of the flange portion are flush with each other.

  Since the flange portion is made of resin, the flange portion is not easily broken even when the thickness of the flange portion in the direction connecting the one end and the other end of the shaft core portion is reduced, and the strength of the core member can be improved. . Therefore, in other words, the core member can be reduced in height by reducing the height of the core member in the same direction and improving the strength. In addition, even if the height of the core member in the same direction is lowered, it is not necessary to shorten the portion where the conductor in the shaft core portion can be arranged in the same direction, and the adjustment can be easily performed without making the adjustment of the L value difficult. is there. Further, by reducing the height of the core member in the same direction to the height of the shaft core portion, it is possible to reduce the height (thinner).

  Further, the shaft core portion has at least a concavo-convex portion or a rough surface portion in the vicinity of one end of the peripheral surface, and the flange portion has a fitting surface that fits into the concavo-convex portion or the rough surface portion at least in the vicinity of one end of the shaft core portion. Therefore, the contour shape of one end of the shaft core portion can be made substantially the same shape as the contour shape of the other end of the shaft core portion, and the collar portion can be configured not to easily come off from the shaft core portion.

  Further, the present invention is a coil component having the above-described core member for a coil component, comprising: a terminal electrode disposed on the flange portion; and a conductor at least partially disposed on the shaft core portion. The coil component is provided such that one end portion and the other end portion thereof form the terminal electrode or are electrically connected to the terminal electrode.

  The coil component core member according to claim 1, comprising a terminal electrode disposed in the collar portion and a conductor at least partially disposed in the shaft core portion, wherein one end portion and the other end portion of the conductor are respectively Since the terminal electrode is formed or electrically connected to the terminal electrode, the number of turns of the conductor (long) can be reduced without increasing or decreasing the height of the shaft core portion in the direction connecting the one end and the other end of the shaft core portion. Can be secured widely, and a coil component in which the L value can be easily adjusted can be provided.

  The other end of the shaft core portion has the other end surface, and a flat plate having a larger area than the other end surface is fixed to the other end separately from the shaft core portion. preferable.

  The other end of the shaft core portion has the other end surface, and a flat plate having a larger area than the other end surface is provided at the other end separately from the shaft core portion. The coil component can be adsorbed by adsorbing the flat plate by the adsorption nozzle.

  In addition, a second concavo-convex portion or a second rough surface portion is provided in the vicinity of the other end of the side surface of the shaft core portion, and the second concavo-convex portion or the second rough surface portion is provided in the vicinity of the other end of the shaft core portion. A second fitting surface that is fitted to the shaft portion, and extends in a direction away from the central axis of the shaft core portion. It is preferable that the other end and the one surface of the second flange portion are the same surface.

  A second fitting that has a second concavo-convex portion or a second rough surface portion in the vicinity of the other end of the peripheral surface of the shaft core portion and fits to the second concavo-convex portion or the second rough surface portion in the vicinity of the other end of the shaft core portion. A second flange portion having a mating surface and extending in a direction away from the central axis of the shaft core portion so as to wrap around the side surface, the other end of the shaft core portion and the second flange portion Since the same surface is formed on one surface, the coil component can be adsorbed by adsorbing the other end of the shaft core portion and the one surface of the second flange portion by the adsorption nozzle when mounting on the mounting substrate.

  Moreover, it is preferable that a groove is formed at the other end of the shaft core portion, and a part of the conductor is disposed in the groove.

  A groove is formed at the other end of the shaft core part, and a part of the conductor is disposed in the groove, so that a part of the conductor can be supported in the groove, without reducing the length of the shaft core, The number of turns (length) of the conductor can be adjusted. For this reason, the adjustable range of the L value can be widened.

Moreover, it is preferable that this conductor is arrange | positioned at the side surface of an axial center part, and is wound. Moreover, it is preferable that the height in the direction which connects the one end and other end of this axial center part is 1 mm or less. Since the height in the direction connecting the one end and the other end of the shaft core portion is 1 mm or less, the coil component can be made sufficiently low in profile.

  As described above, the present invention can provide a coil component core member having a reduced height, easy adjustment of the L value and improved strength, and a coil component having the coil component core member. it can.

  A core member for a coil component according to a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the coil component core member 1 is a core member that constitutes a coil component having a wire, such as a choke coil or a high-frequency coil, and includes a core 10 and a flange 21. ing.

  The core 10 is made of a magnetic material (for example, ferrite or the like), and more specifically, is made of a winding core portion 11 as shown in FIG. The core portion 11 has a substantially quadrangular prism shape. Therefore, the contour shape of one end, which is the lower end of FIG. 1, of the core portion 11 is the other end (the other end surface 11 </ b> A) of the core portion 11 which is the upper end of FIG. It has a rectangular shape that is substantially the same shape as the contour shape. One end surface 11B is provided at one end in the axial direction of the core portion 11 and a collar portion 21 is provided, and the other end surface 11A is provided at the other end in the axial direction. A side surface 11 </ b> C is provided between the one end and the other end of the core portion 11 on the surface of the core portion 11 so as to connect the one end and the other end. The winding core 11 corresponds to an axial core.

  The flange portion 21 is made of resin and is provided in the vicinity of one end, which is the lower end of FIG. 1, of the core portion 11. It extends in the direction of separating and forms a substantially rectangular plate shape with a width of 0.6 mm and a length of 0.3 mm. That is, as shown in FIG. 4A, a rectangular through hole 21a having a shape that matches the contour shape of one end of the core portion 11 is formed in the substantially central portion of the flange portion 21, The vicinity of one end of the core 11 is fitted in the through hole 21a. One end surface 11B of the core portion 11 and one surface 21A of the flange portion 21 near one end of the core portion 11 are flush with each other (same surface) as shown in FIG.

  In FIG. 3, for convenience of explanation, the width of the core part 11 in the left-right direction is shown extremely short. In FIG. 4B, FIG. 7B, FIG. 10, and FIG. 13B, which will be described later, the winding 30 is omitted for convenience of explanation. In FIG. 16B, for convenience of explanation, a part of the winding 30 is omitted for illustration.

  The one side surface 11C (FIG. 1) and the other side surface (not shown) facing the one side surface are roughened, and the entire surface is roughened. The portion of the flange portion 21 that defines the through hole 21a and that faces the rough surface forms a fitting surface 21C. As shown in FIG. 3, the fitting surface 21C is fitted to the rough surface. Is fixed to the vicinity of one end of the core 11. For this reason, it is set as the structure which makes the outline shape of the end of the core part 11 substantially the same shape as the outline shape of the other end (11A of other end surfaces) of the core part 11, and the collar part 21 cannot remove easily from the core part 11. Can do.

  Moreover, since the collar part 21 consists of resin, even if the thickness of the collar part 21 in the direction which connects one end and the other end of the core part 11, ie, the up-down direction of FIG. It is difficult to break, and the strength of the core member 1 can be improved. Therefore, in other words, the core member 1 can be reduced in height by reducing the height of the core member 1 in the same direction and improving the strength.

  Moreover, even if the height of the core member 1 in the same direction is lowered, it is not necessary to shorten a portion in the winding core portion 11 in which a later-described winding 30 can be arranged, and adjustment of the L value is not difficult. Easy adjustment. Further, by making the one end surface 11B of the core part 11 and the one surface 21A of the flange part 21 near one end of the core part 11 flush (same surface), one end and the other end of the core part 11 are made to be the same. The height of the core member 1 in the connecting direction can be made to coincide with the height of the core part 11 to reduce the height (thinner).

  Next, a coil component 101 according to a second embodiment of the present invention will be described with reference to FIGS. In the coil component 101 according to the second embodiment, the coil component 101 is configured by providing the terminal member 22 and the winding 30 on the coil component core member 1 according to the first embodiment.

  As shown in FIGS. 5 and 6, the terminal electrode 22 is formed by bending a substantially rectangular metal plate into a substantially U-shape, as shown in FIGS. 5 and 6, and at a substantially central position of a pair of short sides of the substantially rectangular flange 21. Each one is fitted and provided.

  As the winding 30, for example, a copper wire with a surrounding insulation coating is used, and its diameter is about 20 μm to 80 μm. One end 31 of the winding 30 is electrically connected and connected to one terminal electrode 22. As shown in FIG. 5, the portion near the other end from the one end 31 of the winding 30 faces the four side surfaces 11 </ b> C of the core 11 in order so that the core 11 is rotated twice in the clockwise direction. The other end 32 of the winding 30 is electrically connected to the other terminal electrode 22 and connected. More specifically, the electrical connection is performed by welding or soldering. The winding 30 corresponds to a conductor. The height of the core 10 in the direction connecting the one end and the other end of the core 11, that is, in the vertical direction in FIG. 6 is 0.3 mm, which is 1 mm or less, and the coil component 101 having a sufficiently low height is provided. It has become.

  With the above configuration, a range in which the number of turns (length) of the winding 30 can be adjusted without extending or shrinking the height of the core 11 in the direction connecting the one end and the other end of the core 11. The coil component 101 that can be secured widely and can easily adjust the L value can be provided.

  Next, a coil component 201 according to a third embodiment of the present invention will be described with reference to FIGS. The coil component 201 according to the third embodiment is different from the second embodiment in that a flat plate 14 is provided at the other end of the core part 11. About points other than these, it is the same as that of 2nd Embodiment, and abbreviate | omits description. The same members as those in the second embodiment will be described using the same reference numerals.

  The flat plate 14 is provided at the other end of the core part 11. The flat plate 14 has a rectangular plate shape having a larger area than the other end surface 11 </ b> A of the winding core portion 11, and more specifically having substantially the same area as the lower surface of the flange portion 21 shown in FIG. 9. ing. The flat plate 14 is configured separately from the core part 11 and fixed by being attached to the other end surface 11 </ b> A of the core part 11. The flat plate 14 is made of a resin film and has a thickness of about 50 μm. With this configuration, when mounting on the mounting board, the coil component 201 can be sucked by sucking the flat plate 14 with a suction nozzle (not shown).

  Next, a coil component 301 according to a fourth embodiment of the present invention will be described with reference to FIGS. The coil component 301 according to the fourth embodiment is different from the second embodiment in that a second flange 121 similar to the flange 21 is provided at the other end of the core 11. About points other than these, it is the same as that of 2nd Embodiment, and abbreviate | omits description. The same members as those in the second embodiment will be described using the same reference numerals.

  The second flange 121 is made of resin and is provided in the vicinity of the other end of the core 11, and the side 11 </ b> C (FIG. 12) is wrapped around the other end in the vicinity of the core 11. It extends in a direction away from the central axis, and forms a substantially rectangular plate shape. That is, as shown in FIG. 11, a rectangular through hole 121 a having a shape matching the contour shape of the other end of the core 11 is formed in the substantially central portion of the second flange 121. The vicinity of the other end of the core 11 is fitted in the through hole 121a. The other end surface 11A of the core 11 and the other surface 121A of the second flange 121 near the other end of the core 11 are flush with each other (same surface) as shown in FIG. ing.

  As described above, the one side surface 11C and the other side surface (not shown) facing the one side surface are roughened, and the entire surface is roughened. A portion of the second flange 121 that defines the through-hole 121a and that is opposed to the rough surface forms a fitting surface 121C, and the fitting surface 121C is fitted into the rough surface to thereby form the core portion 11. It is fixed to the vicinity of the other end.

  Since the second flange 121 is provided, the other end surface 11A of the core 11 and the surface 121A of the second flange 121 near the other end of the core 11 are flush with each other (same surface). When mounted on the mounting substrate, the coil component 301 can be sucked by sucking the other end surface 11A of the core 11 and one surface of the second flange 121 with a suction nozzle (not shown).

  Next, a coil component 401 according to a fifth embodiment of the present invention will be described with reference to FIGS. The coil component 401 according to the fifth embodiment is different from the second embodiment in that the groove 11a is formed on the other end surface 11A of the core 11 and the winding method of the winding 30 is different. About points other than these, it is the same as that of 2nd Embodiment, and abbreviate | omits description. The same members as those in the second embodiment will be described using the same reference numerals.

  As shown in FIG. 14, the groove 11 a has one short side parallel to the long side so as to connect substantially the center position of the pair of short sides that define the other end surface 11 </ b> A of the core portion 11 having a substantially rectangular shape. To the other short side, and the depth value of the groove 11 a is larger than the diameter value of the winding 30. Therefore, a part of the winding 30 can be arranged in the groove 11a.

  As shown in FIGS. 14 and 15, the one end 31 of the winding 30 is electrically connected to one terminal electrode 22 and connected. The portion closer to the other end from the one end portion 31 is wound slightly less than one turn around the core portion 11 so as to face the four side surfaces 11C of the core portion 11 in order, and from one end of the groove 11a facing the one end portion 31. Enter into the groove 11a. Then, one end of the core part 11 and the other than the part of the winding 30 wound around the side surface 11C of the core part 11 through the groove 11a and out of the groove 11a from the other end of the groove 11a. In the direction connecting the ends, the other end side of the winding core part 11, that is, the upper side of FIG. 15 is extended to the other terminal electrode 22, and the other end part 32 of the winding 30 is electrically connected to the other terminal electrode 22. Connected to and connected.

  Since the groove 11a is formed at the other end of the core 11 and a part of the winding 30 is disposed in the groove 11a, a part of the winding 30 can be supported in the groove 11a. The number of the windings 30 can be adjusted and the number of turns (length) of the winding 30 can be adjusted without shortening the length of the core part 11 with only one structure 21. For this reason, the adjustable range of the L value can be widened. Further, by changing the depth of the groove 11a, the distance from one end of the core part 11, that is, the lower end of the core part 11 shown in FIG. 15, to the portion of the winding 30 in the groove 11a can be changed. Thus, the L value can be adjusted.

  The core member for coil components and the coil component according to the present invention are not limited to the above-described embodiments, and various modifications and improvements can be made within the scope described in the claims. For example, in the present embodiment, the one side surface 11C and the other side surface (not shown) facing the one side surface are roughened, but the present invention is not limited to this. For example, other than these The side surface may be roughened, and the one end surface 11B and the other end surface 11A may also be roughened. Moreover, even if the roughened surface processing is performed only on the portion where the flange portion 21 is provided and facing the fitting surface 21 </ b> C, that is, the vicinity of one end and the vicinity of the other end of the core 11. Good.

Moreover, although it comprised so that the rough surface of the core part 11 and the fitting surface 21C of the collar part 21 might fit, it is not limited to this structure. For example, an uneven portion is provided in the vicinity of one end or the vicinity of the other end of the core 11, and the hook portion has a fitting surface having a shape that can be fitted to the uneven portion on the surface, and is fitted to the uneven portion. The surface may be fitted. For example, the near one end portion of the peripheral surface along a circumferential direction to form a groove, the engageable projections on the groove in the portion defining the through hole 21a of the flange portion of the winding core portion 11 as a cylindrical shape It is also possible to fix the flange portion to the core portion 11 by engaging the convex portion with the groove .

  Moreover, although the terminal electrode 22 was provided in the collar part 21, and the one end part 31 and the other end part 32 of the coil | winding 30 were connected to the terminal electrodes 22 and 22, it is not limited to this. For example, the one end portion 31 and the other end portion 32 of the winding 30 may constitute a terminal electrode as it is. Moreover, the shape of the core part 11 is not limited to a quadrangular prism shape. For example, the cross section cut perpendicularly to the axial direction of the core part 11 may form a circle and the core part 11 may form a columnar shape.

  Moreover, you may make it provide and mold resin so that the whole coil components may be covered. The core 10 is made of a magnetic material such as ferrite, but may be made of a non-magnetic material such as ceramic.

  The terminal electrode 22 is configured by bending a substantially rectangular metal plate into a substantially U-shape, but is not limited to a metal plate. For example, you may be comprised by the plating electrode.

  The present invention is useful in the field of coil components such as choke coils and high frequency coils, and coil components.

The perspective view which shows the core member for coil components by the 1st Embodiment of this invention. The front view which shows the core member for coil components by the 1st Embodiment of this invention. The principal part expanded sectional view which shows the core member for coil components by the 1st Embodiment of this invention. It is a figure which shows the coil components by the 1st Embodiment of this invention, (a) is a top view, (b) is side sectional drawing. The perspective view which shows the coil components by the 2nd Embodiment of this invention. The front view which shows the coil components by the 2nd Embodiment of this invention. It is a figure which shows the coil components by the 2nd Embodiment of this invention, (a) is a top view, (b) is sectional drawing of a principal part. The perspective view which shows the coil components by the 3rd Embodiment of this invention. The front view which shows the coil components by the 3rd Embodiment of this invention. Side part sectional drawing which shows the coil components by the 3rd Embodiment of this invention. The perspective view which shows the coil components by the 4th Embodiment of this invention. The front view which shows the coil components by the 4th Embodiment of this invention. It is a figure which shows the coil components by the 4th Embodiment of this invention, (a) is a top view, (b) is sectional drawing of a principal part. The perspective view which shows the coil components by the 5th Embodiment of this invention. The front view which shows the coil components by the 5th Embodiment of this invention. It is a figure which shows the coil components by the 5th Embodiment of this invention, (a) is a top view, (b) is sectional drawing of a principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Core member 10 for coil components Core 11 Winding part 11A Other end surface 11a Groove 14 Plane plate 21 Gutter part 21A Surface 21C Fitting surface 22 Terminal electrode 30 Winding 31 One end 32 Other end 101, 201, 301, 401 Coil component 121 Second flange 121C mating surface

Claims (7)

One end, the other end, and a side surface connecting the said one end and the other end, have at least a plurality of uneven portions in the vicinity of one end portion of the side surface, or rough surface, ferrite or a nonmagnetic material An axial core made of ceramic ;
It is made of resin and has a fitting surface that fits into the concavo-convex portion or the rough surface portion at least in the vicinity of one end of the shaft core portion, and extends in a direction away from the central axis of the shaft core portion. And a buttock provided to wear,
The contour shape of one end of the shaft core portion is substantially the same shape as the contour shape of the other end of the shaft core portion, and one end of the shaft core portion and one surface of the flange portion are flush with each other. Core member for coil parts. A coil component comprising the core member for a coil component according to claim 1,
A terminal electrode disposed on the collar,
And at least a part of the conductor disposed on the shaft core part,
A coil component, wherein one end and the other end of the conductor form the terminal electrode or are electrically connected to the terminal electrode, respectively.   The other end of the shaft core portion has the other end surface, and a flat plate having an area larger than that of the other end surface is fixed to the other end separately from the shaft core portion. The coil component according to claim 2. In the vicinity of the other end of the side surface of the shaft core portion, there is a second uneven portion or a second rough surface portion,
Near the other end of the shaft core portion, the second core has a second fitting surface that fits the second uneven portion or the second rough surface portion, and extends in a direction away from the central axis of the shaft core portion. The second collar part provided so as to be mounted, and the other end of the shaft core part and one surface of the second collar part are flush with each other. Coil parts.   The coil component according to any one of claims 2 to 4, wherein a groove is formed at the other end of the shaft core portion, and a part of the conductor is disposed in the groove. The coil component according to claim 5, wherein the conductor is disposed and wound on a side surface of the shaft core portion.   The coil component according to any one of claims 2 to 5, wherein a height in a direction connecting one end and the other end of the shaft core portion is 1 mm or less.

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