JP2021027325A - Inductor - Google Patents

Abstract

To provide an inductor that enables reduction in height and size while achieving sufficient adhesiveness between lead wires at a wound part.SOLUTION: An inductor comprises: an element body that has a magnetic part containing a magnetic powder and a coil buried in the magnetic part; and a pair of external electrodes arranged on the element body so as to be connected with the coil. The coil has: a wound part obtained by winding a lead wire having a pair of wide surfaces around a winding shaft so that one end part of the lead wire is arranged on an inner peripheral part and the other end part of the same is arranged on an outer peripheral part; a first led-out part formed by leading, in a twisted manner, the one end part out from the inner peripheral part side to the outer peripheral part side; and a second led-out part formed by leading the other end part out from the outer peripheral part. A height of the coil in an overlapping region where the wound part and the first led-out part overlap each other is lower than two times a height of the wound part.SELECTED DRAWING: Figure 1

Description

The present invention relates to inductors.

In recent years, inductors used in electronic devices are required to be miniaturized. As one of the inductors used in electronic devices, a coil (so-called α-wound coil) formed by winding one lead wire in two upper and lower stages and pulling out both ends from the outer circumference, a magnetic part covering the coil, and a coil. There is an inductor with an external electrode connected to. In order to reduce the size of such an inductor, a method has been proposed in which both ends of a lead wire constituting a coil are bent in a magnetic portion to reduce the area occupied by both ends of the lead wire in the magnetic portion (for example, Patent Document 1). reference).
Further, in recent years, in order to reduce power consumption, the operating frequency of electronic devices has been increased. Along with this, it is possible to reduce the inductance value of the inductor, and therefore it is possible to reduce the number of turns of the coil. The reduction in the number of turns of the coil is advantageous for the miniaturization of the inductor.

Japanese Unexamined Patent Publication No. 2015-2258787

However, in an inductor having an α-wound coil as described in Patent Document 1, the height of the wound portion is inevitably higher than twice the width of the conducting wire. Therefore, depending on the width of the lead wire used, it is difficult to reduce the height of the inductor to a desired height and reduce the size.
Further, in the inductor having an α-wound coil as described in Patent Document 1, a so-called flat wire having a rectangular cross section and a coating layer and a fusion layer provided on the surface is used, and the upper and lower stages are fused. They are bonded to each other by layering. Therefore, if the number of turns of the coil is reduced, the number of turns in the upper stage of the coil wound in the upper and lower stages and the number of turns in the lower stage of the coil are also reduced, and the bonding area between the lead wire forming the upper stage and the lead wire forming the lower stage of the coil is also reduced. In some cases, the adhesion between the conductors at the winding portion was insufficient.

One aspect of the present invention provides an inductor in which the conducting wires are sufficiently adhered to each other in the winding portion, and the height can be reduced and the size can be reduced.

The inductor according to one aspect of the present invention includes a magnetic part containing magnetic powder, a body having a coil embedded in the magnetic part, and a pair of external electrodes arranged on the body and connected to the coil. The coil is wound around a winding shaft with a pair of wide surfaces such that one end is located on the inner circumference and the other end is located on the outer circumference. A first lead-out portion in which the winding portion and one end are twisted and pulled out from the inner peripheral portion side to the outer peripheral portion side, and a second pull-out portion in which the other end portion is pulled out from the outer peripheral portion. The height of the coil in the overlapping region having the lead-out portion and the winding portion and the first pull-out portion overlap is lower than twice the height of the winding portion.

The inductor according to one aspect of the present invention is an inductor in which the conducting wires are sufficiently adhered to each other in the winding portion, and the height and size can be reduced.

It is a perspective view which shows the inductor which concerns on Embodiment 1 of this invention. It is a perspective view of the coil which concerns on the inductor shown in FIG. It is a figure explaining the degree of twist of the pull-out part of the coil related to the inductor shown in FIG. 1, (a) the case where the twist angle is the angle between the diagonal line and the side in the width direction in the cross section of a conducting wire, and (b). ) When the twist angle is double the angle between the diagonal and the width side in the cross section of the wire, and (c) The twist angle is the angle between the diagonal and the width side in the cross section of the wire. It shows the case where it is made larger than twice. It is a figure explaining the relationship between the twist angle and the height of the pull-out part of the coil which concerns on the inductor shown in FIG. It is a perspective view which shows the inductor which concerns on Embodiment 2 of this invention. It is a perspective view of the coil which concerns on the inductor shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, terms indicating a specific direction or position (for example, "top", "bottom", "right", "left", and other terms including those terms) are used as necessary. .. The use of these terms is to facilitate understanding of the invention with reference to the drawings, and the meaning of these terms does not limit the technical scope of the invention. Further, the parts having the same reference numerals appearing in a plurality of drawings indicate the same parts or members.
In the embodiment described later, the description of the matters common to the above will be omitted, and only the differences will be described. In particular, similar actions and effects with the same configuration will not be mentioned sequentially for each embodiment.

1. 1. Embodiment 1
The inductor 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 3B.
FIG. 1 is a perspective view showing an inductor according to a first embodiment of the present invention. FIG. 2 is a perspective view of the coil related to the inductor shown in FIG. FIG. 3A is a diagram for explaining the degree of twist of the lead-out portion of the coil related to the inductor shown in FIG. 1, and (a) when the twist angle is an angle between the diagonal line and the width direction side in the cross section of the conducting wire. And (b) when the twist angle is double the angle between the diagonal line and the width direction side in the cross section of the lead wire, and (c) the twist angle is set to the diagonal line and the width direction side in the cross section of the lead wire. The case where the angle between the two is larger than twice is shown. FIG. 3B is a diagram illustrating the relationship between the twist angle and the height of the lead-out portion of the coil according to the inductor shown in FIG.

The inductor 1 according to the present embodiment is a pair of an element body 2 having a magnetic part 6 containing magnetic powder and a coil 8 embedded in the magnetic part 6 and a pair arranged on the element body 2 and connected to the coil 8. The external electrode 4 of the above is provided.
The coil 8 includes a winding portion 12 around which a conducting wire 100 having a pair of wide surfaces 10 is wound, and a pair of drawing portions 20 and 22 continuous with the winding portion 12. One end (first end) 14 of the winding portion 12 is arranged on the innermost circumference of the winding portion 12. The other end (second end) 16 of the winding portion 12 is arranged on the outermost circumference of the winding portion 12. One drawer (first drawer) 20 is pulled out from the first end 14 of the winding portion 12, and the other drawer (second drawer) 22 is the second of the winding portion 12. It is pulled out from the end 16. The first pull-out portion 20 is twisted in a region surrounded by the inner circumference of the winding portion 12 and is pulled out from the innermost peripheral side to the outermost outer peripheral side. In the coil 8 including the winding portion 12 and the pair of drawing portions 20 and 22, the height h1 of the coil 8 in the region (overlapping region) 24 where the winding portion 12 and the first drawing portion 20 overlap is set. The height of the winding portion 12 is lower than twice the height h2.
The pair of external electrodes 4 are electrically connected to the drawers 20 and 22, respectively.

<Coil>
As shown in FIGS. 1 and 2, the coil 8 includes a winding portion 12 formed by winding a lead wire 100 and a pair of drawing portions 20 and 22 continuous with both end portions 14 and 16 of the winding portion 12. Has. The lead wire 100 is a so-called flat wire having a pair of wide surfaces 10 facing each other and having a rectangular cross section. Further, the conductor 100 is a conductor having a coating layer having an insulating property on the surface of the conductor and a fusion layer on the surface of the coating layer.

(Rotating part)
The winding portion 12 is formed by winding the lead wire 100 so that its wide surface 10 is substantially parallel to the winding shaft A. The winding portion 12 is formed by winding the lead wire 100 in one stage. The first end 14 of the winding portion 12 is arranged on the innermost circumference, and the second end portion 16 is arranged on the outermost circumference. The adjacent winding guide wires 100 of the winding portion 12 are in contact with each other's wide surfaces 10. Specifically described with reference to the illustrated coil 8, the wide surface 10a on the outer peripheral side of the lead wire 100a on the first lap from the inner peripheral side and the wide surface 10b on the inner peripheral side of the lead wire 100b on the second lap from the inner peripheral side are in contact with each other. And are bonded by a fusion layer.

(Drawer part)
The tip 22a of the second drawer 22 is bent so that its wide surface is substantially parallel to one side surface 2e of the element body 2 described later.
The first drawing portion 20 is drawn out from the inner peripheral side to the outer peripheral side of the coil 8 while being twisted via the upper surface 12a side or the lower surface 12b side of the winding portion 12. At this time, a part of the first drawer portion 20 is in contact with the upper surface 12a or the lower surface 12b of the winding portion 12. In the first drawing portion 20, the height h1 of the coil 8 in the region (overlapping region) 24 where the winding portion 12 and the first drawing portion 20 overlap is lower than twice the height h2 of the winding portion 12. Twisted to be. Here, the height is the length of the winding shaft A in the extending direction D1. Further, the height h1 of the coil 8 in the overlapping region 24 is the sum of the height h2 of the winding portion 12 and the height h3 of the first drawing portion 20 in the overlapping region 24. Further, in the present embodiment, since the lead wire 100 is wound in the winding portion 12 so that the wide surface 10 thereof and the winding shaft A are substantially parallel to each other, the height h2 of the winding portion 12 is the conducting wire 100. Width w. Expressing these as equations,
h1 <2 x h2
h1 = h2 + h3
h2 = w
And when h3 is represented by w,
h3 <w
Will be. Therefore, the first lead-out portion 20 is twisted so that the height h3 in the overlapping region 24 is smaller than the width w of the lead wire 100.

With reference to FIGS. 2, 3A and 3B, the specific degree of twist of the first drawer 20 is determined by the width direction D2 of the first drawer 20 and the extension direction D1 of the winding shaft A in the overlapping region 24. The angle (twisting angle) θ1 between the two will be described. The twist angle θ1 is 90 ° or less.

As described above, the lead wire 100 has a rectangular cross section. Therefore, as shown in FIG. 3A, if the twist angle θ1 is not large to some extent, the height h3 of the first drawer portion 20 in the overlapping region 24 is the height when the first drawer portion 20 is not twisted. That is, it is higher than the width w of the lead wire 100. Specifically, for example, as shown in FIG. 3A (a), when the twist angle is the angle α between the diagonal line L1 in the cross section of the lead wire 100 and the side L2 in the width direction, the first lead-out portion 20 The height h3 is the length d1 of the diagonal line L1 which is longer than the width w of the lead wire 100. On the other hand, for example, as shown in FIG. 3A (c), when the twist angle is sufficiently large, the first lead-out portion 20 approaches a horizontal state, and the height h3 becomes smaller than the width w of the lead wire 100.

As described above, the twist angle θ1 is set in an angle range depending on the rectangular shape of the cross section of the lead wire 100. The angle range set for the twist angle can be geometrically calculated with reference to FIGS. 3A and 3B.
An example of the calculation method of the angle range of the twist angle θ1 will be described below.

As shown in FIG. 3B, the height h3 at the twist angle θ1 is determined by using the length d1 of the diagonal line L1.
h3 = d1cs (θ1-α)
It is expressed as. This can be easily understood by using an auxiliary line L3 that passes through one corner of a rectangle that is the cross-sectional shape of the lead wire 100 and is parallel to the extending direction D1 of the winding shaft A.
Further, the width w of the lead wire 100 is
w = d1cоsα
Is.
Substituting these into h3 <w,
d1cоs (θ1-α) <d1cоsα
Therefore, 2α <θ1
Is calculated.

From the above, the twist angle θ1 of the first drawer portion 20 in the present embodiment is set in the angle range of 2α <θ1 ≦ 90 °.
Further, it is desirable that the twist angle θ1 is appropriately set within the range of 2α <θ1 ≦ 90 ° in consideration of the rigidity of the lead wire 100 used, the force applied to the lead wire 100 due to the twist, and the like.

The conductor of the conductor 100 forming the coil 8 is made of, for example, copper or the like, and has a width of, for example, 140 μm to 170 μm and a thickness of, for example, 67 μm or more and 85 μm or less. The coating layer of the lead wire 100 is formed of an insulating resin such as polyamide-imide, and has a thickness of, for example, 1 μm to 7 μm, preferably 6 μm. Further, the fusion layer of the lead wire 100 is formed of a thermoplastic resin or a thermosetting resin containing a self-bonding component so that the lead wires constituting the winding portion 12 can be fixed to each other, and has a thickness of, for example, 1 μm to 3 μm. , Preferably 1.5 μm. Therefore, the width w of the lead wire 100 forming the coil 8 is, for example, 144 μm to 190 μm, and the thickness is, for example, 7.
It is 1 μm to 105 μm.

<Magnetic part>
As shown in FIG. 1, the magnetic portion 6 has a coil 8 embedded therein. However, the tip 20a of the first pull-out portion 20 and the tip 22a of the second pull-out portion 22 are exposed from the magnetic portion 6. As with the second drawer portion 22, the tip of the first drawer portion 20 may be bent along the surface of the magnetic portion 6 to expose the wide surface of the first drawer portion 20 from the magnetic portion 6. Good.

The magnetic portion 6 is formed by pressure molding a mixture of magnetic powder and resin. The filling rate of the magnetic powder in the mixture is, for example, 60% by weight or more, preferably 80% by weight or more. The magnetic powder includes iron-based metals such as Fe, Fe-Si-Cr, Fe-Ni-Al, Fe-Cr-Al, Fe-Si, Fe-Si-Al, Fe-Ni, and Fe-Ni-Mo. Magnetic powder, metal magnetic powder of other composition system, metal magnetic powder such as amorphous, metal magnetic powder whose surface is coated with an insulator such as glass, metal magnetic powder with modified surface, nano-level minute metal magnetism Powder is used. As the resin, a thermosetting resin such as an epoxy resin, a polyimide resin or a phenol resin, or a thermoplastic resin such as a polyethylene resin or a polyamide resin is used.

<Elementary body>
The element body 2 is composed of the coil 8 and the magnetic portion 6 described above. The element body 2 has a substantially rectangular parallelepiped appearance, for example, a length in the width direction of 1.4 mm to 2.2 mm, a length in the depth direction of 0.6 mm to 1.8 mm, and a height of the element body 2. It is 0.6 mm to 1.4 mm.

<External electrode>
The external electrodes 4 are a pair of external electrodes formed on the surface of the element body 2 and arranged apart from each other. In the present embodiment, one of the external electrodes 4 covers the side surface 2c of the element body 2 and a part of the surfaces 2a, 2b, 2d, and 2f adjacent to the side surface 2c, and the tip 20a of the first drawer portion 20 and electricity. Is connected. The other external electrode 4 covers the side surface 2e of the element body 2 and a part of the surfaces 2a, 2b, 2d, and 2f adjacent to the side surface 2e, and is electrically connected to the tip 22a of the second lead-out portion 22. doing. The pair of external electrodes 4 are formed of, for example, a conductive resin containing metal particles and a resin. Silver is used as the metal particles. Epoxy resin is used as the resin. Further, the pair of external electrodes 4 have a first layer formed of nickel on a conductive resin containing metal particles and a resin, and a second layer formed on the first layer and formed of tin. A plating layer comprising the above may be formed.

<Effect>
In the inductor configured in this way, the lead wire 100 is wound in one stage to form the winding portion 12, and in the first drawing portion 20, the height h3 of the coil 8 in the overlapping region 24 is wound. It is twisted so as to be lower than twice the height h1 of the portion 12. As a result, the height of the coil 8 can be reduced, and as a result, the inductor can be miniaturized.
Further, in the inductor configured in this way, the conductors 100a and 100b on each circumference of the coil 8 are brought into contact with each other's wide surfaces 10a and 10b and bonded to each other by a fusion layer, and the conductors on each circumference are widely bonded to each other. The area is secured. As a result, the conductors on each circumference of the coil 8 can be sufficiently adhered to each other, and the winding fraying of the coil 8 can be prevented.

The inductor configured as described above is arranged on the element body 2 and connected to the coil 8 and the element body 2 having the magnetic portion 6 containing the magnetic powder and the coil 8 embedded in the magnetic portion 6. With a pair of external electrodes 4, the coil 8 has a pair of wide surfaces 10 such that one end 14 is located on the inner periphery and the other end 16 is located on the outer periphery. A winding portion 12 in which a lead wire 100 is wound around a winding shaft, a first drawing portion 20 in which one end portion 14 is twisted and pulled out from the inner peripheral portion side to the outer peripheral portion side, and the other The height h1 of the coil 8 in the overlapping region 24 in which the end portion 16 of the coil 8 has a second pull-out portion 22 drawn out from the outer peripheral portion and the winding portion 12 and the first pull-out portion 20 overlap each other. The height of the winding portion 12 is lower than twice the height h2.

2. 2. Embodiment 2
Next, the inductor 101 according to the second embodiment will be described with reference to FIGS. 4 and 5.
FIG. 4 is a perspective view showing an inductor according to a second embodiment of the present invention. FIG. 5 is a perspective view of the coil related to the inductor shown in FIG.

The inductor 101 according to the second embodiment has a different orientation D5 of the wide surface 110 of the winding portion 112 with respect to the extending direction D3 of the winding shaft B from the inductor 1 according to the first embodiment. The wide surface 10 of the winding portion 12 of the inductor 1 was substantially parallel to the winding shaft A, but the wide surface 110 of the winding portion 112 of the inductor 101 is inclined with respect to the winding shaft B. It can be said that the winding portion 112 is inclined toward the horizontal state.

The inclination angle θ3 of the wide surface 110 with respect to the winding shaft B is set to a value within the range of 2α ≦ θ3 ≦ 90 °, preferably within the range of 2α ≦ θ3 <90 °. This is based on the same idea as the idea when the angle range of the twist angle θ1 is explained in the first embodiment. It is not suitable for the object of the present invention that the height h5 of the winding portion 112 becomes higher than that before the inclination as a result of inclining the wide surface 110 with respect to the winding shaft B. Therefore, the inclination angle θ3 is set to a value within the range of 2α ≦ θ3 ≦ 90 °, preferably within the range of 2α ≦ θ3 <90 °. The angle α is the same as the angle α in the first embodiment.

On the other hand, if the inclination angle θ3 is too large, the cross-sectional area of the coil 108 (the area surrounded by the innermost lead wire 200 of the winding portion 112) becomes small, and therefore the inductance value becomes small. Therefore, the inclination angle θ3 is determined in consideration of a desired inductance value, a desired coil height, a width of the lead wire 200, and the like.

Further, as shown in FIG. 5, in the winding portion 112, when the first drawing portion 120 is pulled out to the outer peripheral portion side via the lower surface 112b side of the winding portion 112, the upper surface 112a of the winding portion 112 The distance between the and the winding shaft B is inclined so as to be shorter than the distance between the lower surface 112b of the winding portion 112 and the winding shaft B. That is, the winding portion 112 is tapered from the lower surface 112b toward the upper surface 112a. On the other hand, in the winding portion 112, when the first drawing portion 120 is pulled out to the outer peripheral portion side via the upper surface 112a side of the winding portion 112, the distance between the upper surface 112a of the winding portion 112 and the winding shaft B Is inclined so as to be longer than the distance between the lower surface 112b of the winding portion 112 and the winding shaft B. That is, the winding portion 112 is tapered from the upper surface 112a to the lower surface 112b.

Further, in the inductor 101 according to the second embodiment, the wide surface 110 of the lead wire 200 is inclined with respect to the winding shaft B, so that the width direction D4 and the winding shaft of the first drawing portion 120 in the overlapping region 124 The range of the angle (twist angle) θ2 between B and the extending direction D3 is different from the range of the twist angle θ1 in the first embodiment.

The range of the twist angle θ2 according to the present embodiment will be described.
First, the first pull-out portion 120 is twisted so that the height h4 of the coil 108 in the overlapping region 124 is lower than twice the height h5 of the winding portion 112, as in the first embodiment. The height h4 of the coil 108 in the overlapping region 124 is the sum of the height h5 of the winding portion 112 and the height h6 of the first drawing portion 120 in the overlapping region 124. Expressing these as equations,
h4 <2 x h5
h4 = h5 + h6
And if h6 is represented by h5,
h6 <h5
Will be. Therefore, the first drawer portion 120 is twisted so that the height h6 in the overlapping region 124 is smaller than the height h5 of the winding portion 112.

In the present embodiment, as described above, the inclination angle θ3 is 2α ≦ θ3 ≦ 90 °, preferably 2α ≦ θ3 <90 °. Therefore, as a result of twisting the first drawer portion 120, in order to make the height h6 of the first drawer portion 120 in the overlapping region 124 lower than the height h5 of the winding portion 112, the first drawer portion 120 Needs to be closer to the horizontal state than the winding portion 112. This can be achieved by setting the twist angle θ2 to the tilt angle θ3 or higher. Therefore, the twist angle θ2 in this embodiment is set to θ3 <θ2 ≦ 90 ° (2α ≦ θ3 ≦ 90 °, preferably 2α ≦ θ3 <90 °). Even in this actual embodiment, the twist angle θ2 is
Considering the rigidity of the lead wire 200, the force applied to the lead wire 200 due to twisting, and the like, it is desirable that the setting is appropriately set within the range of θ3 <θ2 ≦ 90 °, preferably within the range of 2α ≦ θ3 <90 °.

<Effect>
In the inductor configured in this way, the wide surface 110 of the winding portion 112 is inclined with respect to the winding shaft B. As a result, the coil 108 can be made to the bottom, and the inductor can be miniaturized.

3. 3. Manufacturing Method Next, a manufacturing method of the inductor according to the embodiment will be described.
The method for manufacturing the inductor according to the embodiment is
(1) The process of forming the coil and
(2) The process of forming the element body and
(3) Includes a step of forming an external electrode.
The details of each step will be described below.

(Process of forming a coil)
In this step, a coil having a winding portion and a drawing portion is formed. The coil has an insulating coating layer formed on the surface of the conductor and a fusion layer formed on the surface of the coating layer, and uses a conducting wire (so-called flat wire) having wide surfaces facing each other. It is formed. The winding portion is wound by bringing the wide surfaces of the adjacent windings into contact with each other so that the first end of the lead wire is located on the inner peripheral portion and the second end is located on the outer peripheral portion. The fused layers bond the wires together. At this time, the coil 8 according to the first embodiment can be formed by winding the wide surface so as to be substantially parallel to the winding shaft, and the coil according to the second embodiment can be formed by inclining the wide surface with respect to the winding shaft. 108 can be formed.
Next, one end of the winding portion is pulled out from the inner peripheral portion side to the outer peripheral portion side while twisting so that the twist angle with respect to the winding shaft in the overlapping region is within a predetermined range, and the first drawing portion To form. Further, the other end of the winding portion is pulled out from the outer peripheral portion of the winding portion to form a second drawing portion.

(Step of forming the element body)
In this step, the coil is housed in the cavity of the mold, and the cavity is filled with a mixture of magnetic powder and resin. At this time, it is desirable that the coil is housed in the cavity so that the line end of the first pull-out portion and the tip end of the second pull-out portion are in contact with the side surface of the cavity. Furthermore, mixtures of resin a temperature above the softening temperature of the magnetic powder and the resin in the mold (e.g., 60 ° C. to 150 DEG ° C.) and heated ^{at, 100kg / cm 2 ~500kg / cm} 2 approximately pressurized, It is molded and cured by heating it to a temperature equal to or higher than the curing temperature of the resin (for example, 100 ° C to 220 ° C). As a result, the magnetic portion and the coil are integrated, and an element body in which the tip of the first drawer portion and the tip of the second drawer portion are exposed is formed on the side surface. The curing may be performed after molding.

(Step of forming an external electrode)
In this step, the front end of the first drawer portion and the tip of the second drawer portion are exposed on the side surface of the element body, and a pair of external surfaces separated from each other over a part of four surfaces adjacent to the side surface. Electrodes are formed. The pair of external electrodes are formed by applying a conductive resin having fluidity such as a conductive paste to a desired position of the element body by dipping. Further, the pair of external electrodes may be formed by plating the coated conductive resin. Plating is composed of a nickel layer formed on a conductive resin and a tin layer formed on the nickel layer.

Although the embodiments of the present invention have been described above, the disclosed contents may be changed in the details of the configuration, and changes in the combination and order of the elements in the embodiments deviate from the requested scope and ideas of the present invention. It can be realized without any problems. Further, in the first and second embodiments, a spiral portion having a winding portion formed in a spiral shape having a plurality of turns such as two turns and three turns can also be applied. Further, in the second embodiment, the case where the wide surface 110 is inclined with respect to the winding shaft B on the entire circumference of the coil winding portion is shown, but the wide surface 110 is provided for a part of the circumference of the coil winding portion. May be tilted with respect to the winding shaft B. Furthermore, in the first and second embodiments, the coils may be arranged upside down in the body.

1,101 inductor 2 element body 4 external electrode 6 magnetic part 8,108 coil 10, 110, 10a, 10b wide surface 12, 112 winding part 12a, 112a upper surface 12b, 112b lower surface 14, 114 first end 16, 116 Second end 20, 120 First lead 22, 122 Second lead 24, 124 Overlapping area 100, 100a, 100b, 200 Leads A, B Winding shafts D1, D3 Rolling shaft extending direction D2 , D4 Width direction of the lead-out part in the overlapping area D5 Direction of the wide surface of the winding part with respect to the extending direction of the winding axis d1 Diagonal line length L1 Diagonal line L2 Width direction side L3 Auxiliary line w Lead wire width h1, h4 Overlapping area Height of coil h2, h5 Height of winding part h3, h6 Height of lead-out part in overlapping area α Angle between diagonal and width direction θ1, θ2 Twist angle θ3 Tilt angle

Claims (4)

A magnetic part containing magnetic powder and a body having a coil embedded in the magnetic part,
A pair of external electrodes arranged on the body and connected to the coil.
The coil
A winding portion in which a wire having a pair of wide surfaces is wound around a winding shaft so that one end is arranged on the inner peripheral portion and the other end is arranged on the outer peripheral portion.
A first pull-out portion in which one end is twisted and pulled out from the inner peripheral side to the outer peripheral side, and a second pull-out portion in which the other end is pulled out from the outer peripheral portion. Has a drawer and
An inductor characterized in that the height of the coil in the overlapping region where the winding portion and the first drawing portion overlap is less than twice the height of the winding portion. The twist angle θ1 between the width direction of the first lead-out portion and the extension direction of the winding shaft of the winding portion in the overlapping region is between the diagonal line and the width direction side in the cross section of the lead wire. The inductor according to claim 1, which is larger than twice the angle α and 90 ° or less. The inductor according to claim 1 or 2, wherein the wide surface of the lead wire constituting the winding portion is substantially parallel to the winding shaft. The inductor according to claim 1 or 2, wherein the wide surface of the lead wire constituting the winding portion is inclined with respect to the winding shaft.

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