JP2011199093A - Coil for electronic components - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil that facilitates manufacture in a desired shape by winding a rectangular wire.SOLUTION: The coil is provided for use in an electronic component manufactured by arranging a core member on the inner periphery side of the coil. The coil is obtained by winding a rectangular wire which is formed of plastically deformable material and which has a roughly rectangular cross section with a cross section short side of the rectangular wire on an inner periphery side. The thickness along a cross section short side on the inner periphery side of a curve of a strand of the coil is thicker than the thickness along a cross section short side on an outer periphery side of the curve. The direction of a straight line passing through a middle point of the cross section short side on the inner periphery side of the curve of the strand of the coil and a middle point of the cross section short side on the outer periphery side of the curve is roughly vertical to a center axis of the coil.

Description

  The present invention relates to a coil for electronic components.

  2. Description of the Related Art As an inductor that is an electronic component, an inductor that includes a coil in which a wire having a rectangular cross section is wound edgewise is known (see Patent Document 1, Patent Document 2, and Patent Document 3).

  By the way, a small surface-mount type inductor is required to be very small, low in electrical resistance, and high in inductance. In order to reduce the size of the inductor, the outer shape of the inductor itself is preferably a rectangular parallelepiped, and in order to reduce the resistance of the inductor, the internal coil is edgewise wound with a wire having a rectangular cross section (ie, a flat wire). In order to increase the inductance, it is preferable that the core (that is, the core) inside the coil is a square core (that is, a core having a rectangular cross section).

  Generally, when a coil is manufactured by edgewise winding a flat wire, the flat wire is wound directly around a core (for example, a magnetic core). In this case, since the flat wire needs to be plastically deformed, the flat wire is wound around the core while pulling the flat wire with high tension. When the core is a square core, the flat wire is wound around the core while pulling the flat wire with higher tension. However, in general, since the strength of the core is not sufficient for edgewise winding a flat wire, it is practically impossible to wind the flat wire directly on the core by edgewise winding. Of course, even if a rectangular wire is wound directly around the core by edgewise winding, a coil having a desired shape cannot be obtained.

  As described above, when a flat wire is directly wound around the core by edgewise winding, a coil having a desired shape cannot be easily obtained. This also applies when a coil is manufactured by winding a flat wire.

JP 2007-311525 A JP 2007-188988 A JP 2007-173263 A

  Therefore, an object of the present invention is to provide a coil that can be easily manufactured into a desired shape by winding a rectangular wire.

  In order to solve the above-mentioned object, a first invention of the present application is a coil used for an electronic component manufactured by arranging a core material on the inner peripheral side of a coil, and is a substantially rectangular shape made of a plastically deformable material. It is a coil manufactured by winding a rectangular wire with a cross section with the short side of the cross section of the flat wire as the inner peripheral side. And in this invention, the thickness along the cross-section short side of the inner peripheral side of the curved part of the wire of the said coil is thicker than the thickness along the cross-sectional short side of the outer peripheral side of the same curved part. In the present invention, the direction of the straight line passing through the midpoint of the short side of the inner peripheral side of the curved portion of the wire of the coil and the midpoint of the short side of the outer peripheral side of the curved portion is the center of the coil. It is substantially perpendicular to the axis.

  In the second invention of the present application, in the first invention of the present application, the midpoint of the short side of the cross section on the inner peripheral side of the curved portion of the coil of the coil is a straight line perpendicular to the central axis of the coil. When the distance between the straight line passing through and the straight line perpendicular to the central axis of the coil and passing through the midpoint of the short side of the outer periphery of the curved portion of the coil wire is defined as the amount of inclination The inclination amount is 70 μm or less.

  In the third invention of the present application, in the first or second invention, the distance between the short cross section on the inner peripheral side of the curved portion of the wire of the coil and the short short cross section on the outer peripheral side of the same curved portion is determined. The ratio of the amount of inclination with respect to the width of the wire of the coil is 0.18 or less.

  In the fourth invention of the present application, in any one of the first to third inventions of the present application, the same as the midpoint of the short side of the inner circumference of the first curved portion of the second turn of the element wire of the coil. The direction of a straight line passing through the midpoint of the short side of the cross section on the outer peripheral side of the curved portion is inclined from a plane substantially perpendicular to the central axis of the coil.

  According to a fifth invention of the present application, in any one of the first to fourth inventions of the present application, the inner peripheral side of the same curved portion with respect to the thickness along the short side of the outer peripheral side of the curved portion of the wire of the coil The ratio of the thickness along the short side of the cross section is 1.2 to 3.0.

  In a sixth invention of the present application, in any one of the first to fifth inventions of the present application, a ratio of a length of a long cross section of the rectangular wire to a length of a short cross section of the flat wire is 5 to 10. It is.

  In the seventh invention of the present application, in the sixth invention of the present application, the ratio of the length of the long cross section of the rectangular wire to the length of the short cross section of the flat wire is 6-8.

  In an eighth invention of the present application, in any one of the first to seventh inventions of the present application, the rectangular wire is a metal wire.

  In the ninth invention of the present application, in the eighth invention of the present application, the rectangular wire is a silver wire.

  In a tenth invention of the present application, in the first to ninth inventions of the present application, the thickness along the short side of the flat wire is 100 μm or less.

  In an eleventh aspect of the present invention, in the tenth aspect of the present invention, the thickness along the short side of the flat wire rod before being wound around the jig is 25 μm to 50 μm.

  According to the first to eleventh aspects of the present application, a coil that can be easily manufactured into a desired shape is provided.

  According to the fourth invention of the present application, the midpoint of the short side of the inner circumference side of the first curved part of the second turn of the coil wire and the midpoint of the short side of the cross section of the outer circumference side of the same curved part are obtained. Since the direction of the straight line that passes through is inclined from a plane that is substantially perpendicular to the central axis of the coil, it is the same curve as the midpoint of the short side of the inner circumference of the curved portion after the third round of the coil wire The direction of the straight line passing through the midpoint of the short side of the cross section on the outer peripheral side of the portion is prevented from being inclined from a plane substantially perpendicular to the central axis of the coil.

  According to the ninth invention of the present application, in particular, since the flat wire is a silver wire, the flat wire is easily plastically deformed, and a coil having a desired shape can be easily manufactured.

It is a perspective view of an embodiment of a coil of the present invention. It is a longitudinal cross-sectional view of the curved part of the strand of the coil shown in FIG. It is a longitudinal cross-sectional view of the wire used for manufacturing the coil shown in FIG. It is sectional drawing which showed the inductor using the coil of this invention, Comprising: It is sectional drawing when it cuts so that the curved part of the strand of the coil of this invention may be passed. It is the figure which showed a mode that the coil shown in FIG. 1 was manufactured. It is a perspective view of another embodiment of the coil of the present invention. It is a longitudinal cross-sectional view of the strand of the coil which can apply this invention. FIG. 3 is a diagram similar to FIG. 2, for illustrating the amount of inclination of a flat wire with respect to the width of the flat wire in Table 1.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the coil 10 of the present embodiment is a coil in which the element wire is formed in a substantially square shape and is wound a plurality of times with respect to the central axis AX. Further, in the coil 10 of the present embodiment, when the wire is wound, the first bent portion 10A of the second turn of the coil (in other words, the same bent portion as the midpoint of the short side of the cross section on the inner peripheral side of the bent portion) (The direction of a straight line passing through the midpoint of the short side of the outer periphery of the coil) is inclined relatively greatly from a plane substantially perpendicular to the coil center axis AX.

  Moreover, as shown in FIG. 2 which is a longitudinal cross-sectional view of the curved portion 10E of the element wire (hereinafter referred to as “coil element wire”) 10B of the coil 10 shown in FIG. In the curved portion 10E, the thickness of the inner peripheral portion 10Bin (that is, the thickness along the short sectional side SSin of the inner peripheral portion) Tin is the thickness of the outer peripheral portion 10Bout (that is, the short sectional side of the outer peripheral portion). Thickness along SSout) is larger than Tout. Here, the ratio of the thickness Tin of the inner peripheral side portion of the bent portion to the thickness Tout of the outer peripheral portion of the bent portion of the coil wire is preferably 1.2 to 3.0.

  Further, as shown in FIG. 3, the wire 10B used for manufacturing the coil 10 of the present embodiment is a flat wire 10C having a substantially rectangular cross section. The rectangular wire 10C is made of a plastically deformable material, preferably a metal material, more preferably a silver (Ag) material. Further, the ratio of the width of the flat wire rod (that is, the length of the long cross-section side LS of the flat wire rod) W to the thickness of the flat wire rod 10C (that is, the length of the short cross-section SS of the flat wire rod) T is preferably It is 5-10, More preferably, it is 6-8. Further, the thickness T of the rectangular wire 10C is preferably 100 μm or less, and more preferably 25 μm to 50 μm.

  In addition, the coil 10 of this embodiment is used for an electronic component, for example, is used for an inductor. When the coil 10 of this embodiment is used for an inductor, as shown in FIG. 4, the magnetic core material 20 is disposed on the inner peripheral side of the coil 10, and the magnetic body 30 is disposed around the coil 10. The magnetic core material 20 and the magnetic body 30 are produced by, for example, a gel cast method. An insulating coating layer 10D that covers the coil wire 10B is sandwiched between the coil wires 10B.

  Moreover, the coil 10 of this embodiment is manufactured by winding the rectangular wire 10C mentioned above by edgewise winding, for example. That is, as shown in FIG. 5, the rectangular wire 10 </ b> C described above is wound around the rod-shaped jig 40 having a substantially square cross section by edgewise winding in a state where the tension TEN is applied. In this example, the jig 40 has a strength higher than that of the core material (for example, the magnetic core material 30) disposed on the inner peripheral side of the finally manufactured coil 10. Therefore, according to this example, the rectangular wire 10C can be wound in a state where a relatively high tension is applied. Further, in this example, when the rectangular wire 10C is wound around the jig 40, the portion of the rectangular wire corresponding to the first portion 10B in the second turn (that is, the bent portion of the coil wire) is relative to the coil center axis AX. Then, the rectangular wire 10C is wound around the jig 40 so as to be relatively largely inclined from the substantially vertical plane.

  Further, in this embodiment, since the flat wire 10C is wound around the jig in a state where tension is applied, the thickness of the inner peripheral side portion of the flat wire 10C is the original flat wire (that is, in the bent portion 10E of the flat wire 10C). , The thickness of the rectangular wire before being wound around the jig 40 becomes thicker, while the thickness of the outer peripheral portion of the rectangular wire 10C becomes thinner than the thickness of the original rectangular wire. For this reason, in the coil 10 of this embodiment, the thickness Tin of the inner peripheral side portion of the coil strand is thicker than the thickness Tout of the outer peripheral portion of the coil strand in the bent portion 10E of the coil strand. At this time, as shown in FIG. 2, the midpoint of the short section SSin on the inner peripheral side of the bent portion 10E of the coil wire and the midpoint of the short section SSout on the outer peripheral side of the bent portion 10E The inner peripheral side portion 10Bin of the curved portion of the coil wire can support the coil wire 10B with respect to the jig so that the direction E of the straight line passing is substantially perpendicular to the coil center axis AX (that is, support) The flat wire 10C is wound around the jig 40 so that the thickness of the inner peripheral side portion of the flat wire 10C is increased.

  In addition, although the coil 10 of embodiment mentioned above is a coil wound over multiple times so that a wire may make a substantially square regarding coil central axis AX, this invention is a wire, as shown in FIG. Can be applied to a coil wound a plurality of times so as to form a substantially oval shape, and can also be applied to a coil wound a plurality of times so that the wire material forms a substantially rectangular shape.

  Moreover, although the shape of the longitudinal cross-section of the wire (namely, flat wire 10C) which comprises the coil 10 of embodiment mentioned above is a substantially rectangular shape, this invention was shown to FIG. 7 (A) and FIG. 7 (B). As described above, the present invention can also be applied to a coil formed of a wire having a vertical cross-sectional shape in which the long cross-section is a straight line and the short cross-section is rounded. Note that the short cross section of the wire shown in FIG. 7A forms a semicircle having a diameter substantially equal to the thickness of the wire, and the short cross section of the wire shown in FIG. 7B is the thickness of the wire. It has a larger diameter arc. Therefore, in this specification, “the cross-section is substantially rectangular” includes the cross-sectional shapes shown in FIGS. 7A and 7B.

  Further, the rectangular wire 10 </ b> C constituting the coil 10 of the above-described embodiment may be a coated wire. In this case, the thickness, width, cross-section long side, and cross-section short side dimensions of the flat wire 10C described above are dimensions excluding the coating.

  Further, in Table 1 below, the ratio of the width W of the flat wire to the thickness T of the flat wire 10C before being wound on the jig 40 was changed between 5.0 to 10.0 and wound on the jig. The thickness of the short side of the cross section on the outer peripheral side of the curved portion of the subsequent flat wire (ie, the coil wire) (thickness of the thinnest portion of the flat wire) Tout (Thickness of the thickest part of the wire) Tin ratio is changed between 1.1 to 3.5, the tension when winding the rectangular wire 10C around the jig 40, and the jig to be sandwiched when wound around the jig 40 The width of the bent portion of the coil wire when the change start point (angle) and change end point (angle) of the distance between the caps are changed (this width is the inner circumference of the bent portion of the coil wire) Coil between the short cross-section SSin on the side and the short cross-section SSout on the outer peripheral side of the same curved portion) W It showed a ratio of inclination of C line.

  Note that the amount of inclination C of the coil wire is the amount of inclination C shown in FIG. That is, a straight line that is perpendicular to the coil center axis AX and passes through the midpoint of the short side SSin on the inner peripheral side of the curved portion of the coil wire 10B, and a straight line that is perpendicular to the coil center axis AX And the distance from the straight line Lout passing through the midpoint of the short cross-section SSout on the outer peripheral side of the curved portion of the coil wire 10B.

  Referring to Table 1, in Examples 1 to 6, the ratio of the coil wire inclination amount C is very small, 0.1 to 0.18, and in Comparative Examples 1 to 4, the ratio is 0.3 or more. It turns out that it is very big. In Examples 1 to 6, the ratio of the width W of the flat wire to the thickness T of the flat wire before being wound on the jig 40 is 5 to 10, and the flat wire ( That is, the ratio of the thickness Tin of the inner peripheral side portion of the curved portion to the thickness Tout of the outer peripheral side portion of the curved portion of the coil wire is 1.2 to 3.0. According to the data shown in Table 1, in this embodiment, the ratio of the width W of the rectangular wire to the thickness T of the rectangular wire before being wound around the jig 40 is 5 to 10, and The ratio of the thickness Tin of the inner peripheral side portion of the curved portion to the thickness Tout of the outer peripheral side portion of the curved portion of the flat wire (that is, the coil wire) after being wound is 1.2 to 3.0. It can be said that it is preferable. The ratio of the width W of the flat wire to the thickness T of the flat wire before being wound on the jig 40 is preferably 5 to 10, more preferably 6 to 8.

  Further, in the present invention, if the amount of inclination C is 70 μm or less, it passes through the midpoint of the short side of the inner peripheral side of the curved portion of the coil wire and the midpoint of the short side of the cross section of the outer peripheral side of the same bent portion. It is assumed that the direction of the straight line is substantially perpendicular to the coil center axis AX. Therefore, the embodiment shown in FIG. 2 is an embodiment in which the tilt amount C is zero.

  DESCRIPTION OF SYMBOLS 10 ... Coil, 10B ... Coil strand, 10Bin ... Inner peripheral side part of the curved part of a coil strand, 10Bout ... Outer peripheral side part of the curved part of a coil strand, 10C ... Flat wire, 10D ... Insulation coating layer, 20 ... Magnetic core material, 30 ... magnetic body, 40 ... jig, AX ... central axis of coil

Claims (11)

  A coil used for an electronic component manufactured by arranging a core material on the inner peripheral side of a coil, and a rectangular wire having a substantially rectangular cross section made of a plastically deformable material In the coil manufactured by winding as a side, the thickness along the short cross section on the inner peripheral side of the curved portion of the wire of the coil is thicker than the thickness along the short cross section on the outer peripheral side of the curved portion, The direction of a straight line passing through the midpoint of the short side of the inner peripheral side of the curved portion of the coil of the coil and the midpoint of the short side of the outer peripheral side of the curved portion is substantially perpendicular to the central axis of the coil The coil characterized by becoming.   A straight line that is perpendicular to the central axis of the coil and that passes through the midpoint of the short side of the inner circumference of the curved portion of the coil of the coil, and a straight line that is perpendicular to the central axis of the coil The inclination amount is 70 μm or less when the distance from the straight line passing through the midpoint of the short side of the outer periphery of the curved portion of the wire portion of the coil is defined as the inclination amount. The coil according to 1.   When the distance between the short side of the inner peripheral side of the curved portion of the wire portion of the coil and the short side of the outer peripheral side of the curved portion is the width of the strand of the coil, the width of the coil of the coil The coil according to claim 1, wherein a ratio of the amount of inclination with respect to is 0.18 or less.   The direction of the straight line passing through the midpoint of the short section of the inner circumference of the first curved portion of the second turn of the element wire of the coil and the midpoint of the short section of the outer circumference of the curved portion is the center of the coil The coil according to any one of claims 1 to 3, wherein the coil is inclined from a plane substantially perpendicular to the axis.   The ratio of the thickness along the short cross section on the inner peripheral side of the curved portion to the thickness along the short cross section on the outer peripheral side of the curved portion of the coil of the coil is 1.2 to 3.0. The coil according to any one of claims 1 to 4.   The coil according to any one of claims 1 to 5, wherein a ratio of the length of the long side of the flat wire to the length of the short side of the flat wire is 5 to 10.   The coil according to claim 6, wherein a ratio of the length of the long side of the flat wire to the length of the short side of the flat wire is 6-8.   The coil according to any one of claims 1 to 7, wherein the flat wire is a metal wire.   The coil according to claim 8, wherein the flat wire is a silver wire.   The coil according to any one of claims 1 to 9, wherein a thickness along a short cross-section of the flat wire is 100 µm or less.   The coil according to claim 10, wherein a thickness along a short side of the flat wire is 25 μm to 50 μm.

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