JP2009231518A - Wire-wound inductor and mounting method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire-wound inductor which eliminates lead wires at both ends of the wire-wound inductor and eliminates variations in the floating inductance, makes circuit operation stable making reliability high, and which is easy to manufacture, as well asl, to provide a wire-wound inductor which is automatically alignable and mounted on a printed board fully automatically by devising the shape of a base end portion. <P>SOLUTION: A wire-wound type inductor 1 is formed, by winding a conductor around a core 2, formed into a tapered shape which gradually decrease for the rate of diameter reduction of the outside diameter from a large-diameter base end, as going toward a small-diameter chip. In this case, the core is wound, such that the winding of the conductor is not fixed in the diameter but is gradually decreased, as going toward the chip; the core has a straight shape portion 9 with a fixed outside diameter at the base end portion; and both the electrode portion present at the straight-shape portion and the tapered chip are directly surface-jointed to the terminals of the printed board through soldering. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wire-wound inductor excellent in practicality that exhibits good passage loss characteristics in a wide frequency band.

  Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 2004-6695, Japanese Patent Application Laid-Open No. 2007-150248, and Japanese Patent Application Laid-Open No. 2008-16462, a conductor is wound around a conical or pyramidal core. A wire wound inductor having the structure as described above has been proposed.

  This is different from the above-mentioned type in which the outer diameter of the core is constant, and as shown in FIG. 8, the outer diameter of the core is gradually reduced, and the winding diameter of the conductive wire wound around the core is also gradually increased. In order to reduce the diameter, it is a single winding type inductor but has a plurality of different resonance frequencies instead of a single one.

  Therefore, a wound inductor of a type in which the outer diameter of the core changes is different from the above-described type in which the outer diameter of the core is constant, and a single wound inductor has a plurality of different resonance frequencies and only one winding. Even though it is a linear inductor, it can function well as an inductor in a very wide frequency band, and a high attenuation can be obtained in a wide frequency band.

The following is a detailed description of Japanese Patent Application Laid-Open No. 2007-150248, which is summarized as follows.
The above type of wire wound inductor is a wire wound inductor formed by winding a conducting wire around a core. The core is made of a ferrite or a dielectric, and a mixture of resin and iron powder is formed on an air core coil. A filled structure or the like is also used. Moreover, a copper wire is adopted as the conducting wire.
The taper-shaped portion of the core sharply decreases in diameter on the proximal end side of the taper-shaped portion, and the tapered shape gradually decreases in diameter on the distal end side of the small diameter as compared with the large-diameter proximal end side. Thus, the cross section in which the diameter reduction rate of the core gradually decreases from the large diameter tip of the tapered portion toward the small diameter base end is formed in a hyperbolic shape. Moreover, the longitudinal cross-sectional shape of the tapered portion is a circle or a polygon.

  The shape of the tapered portion is not limited to the above, but the actual outer diameter line is recessed inward rather than the virtual outer shape line connecting the large diameter proximal end and the small diameter distal end of the tapered shape portion. The tapered portion of the core has a larger inclination angle (large diameter reduction ratio) on the proximal end side of the tapered portion, and a smaller distal end side than the proximal end side. You may form in the inclined surface form which has several taper surfaces which have a small inclination angle (small diameter reduction rate) and a different inclination angle. That is, the shape is not limited to a shape in which the diameter reduction rate gradually decreases gradually from the base end side with a large diameter toward the tip end side with a small diameter, but a shape in which the diameter reduction rate gradually decreases in a stepwise manner, that is, the cross section is a broken line Shape may be sufficient.

The core has a straight portion having a constant outer diameter, and is formed in a shape in which the outer diameter of the core is reduced by the tapered portion from an end portion of the straight portion. Specifically, it is a shape having the straight portion from the base end having a large diameter of the tapered portion formed in the core. The straight portion has a bottom or a round shape.
Japanese Patent Application Laid-Open No. 2004-6695 is shown in FIGS.

  In the wire-wound inductor shown in FIG. 12, the conductive wire 16 in which an insulating coating 14 made of a polymer insulating material such as polyester or polyurethane is formed on the surface of the copper wire 12 is formed into a conical shape made of a dielectric ceramic or a magnetic material such as ferrite. The core 18 is wound around the outer peripheral surface of the winding part 20. Further, both ends of the conductive wire 16 are formed as terminal portions 22 by peeling the insulating coating 14 and exposing the copper wire 12. FIG. 13 is a side view of FIG.

However, the conventional wire-wound inductor has a structure having lead wires 31 and 32 extending from the coil 30 at the front end and the base end, as shown in FIG. When mounted, the lead wires 34 and 35 are respectively present between the substrate signal line 33 and the ground 36 as shown in FIG.
In this way, if there is a lead wire part between the circuit of the component and the board, even a slight distortion of the lead wire will cause an inductance at a very high frequency (especially in the GHz band), and the circuit characteristics will vary. There was a defect that it would cause malfunction and lack reliability in handling.
JP 2004-6695 A JP 2007-150248 A JP 2008-16462 A

The problem to be solved by the present invention is that the lead wires at both ends are eliminated, and fluctuations in stray inductance due to the lead wires at both ends are eliminated, so that the circuit operation is stable and highly reliable. An object of the present invention is to provide a simple wound inductor.
In addition, by devising the shape of the base end part, it adopts a structure that can be automatically aligned and easy to grasp the chuck, so it is possible to provide a wound inductor that can be fully automatically mounted on a printed circuit board. Objective.

  As a means for solving this problem, the wound inductor according to claim 1 of the present invention has a tapered shape in which the diameter reduction rate of the outer diameter gradually decreases from the large diameter base end to the small diameter distal end. A wire-wound inductor formed by winding a conductive wire around a formed core, and by winding the wire around the core, the diameter of the winding of the conductive wire is not constant but gradually decreases toward the tip, and the core Has a straight-shaped part with a constant outer diameter at the base end part, and both the electrode part extending to the straight-shaped part and the tapered tip part are directly soldered to the terminal of the circuit board and surface bonded. It is characterized by doing.

  Further, in the wound inductor according to claim 2 of the present invention, in the wound inductor, the tapered cross-sectional shape in which the reduction ratio of the outer diameter gradually decreases is an arbitrary straight line or curved line, When attached to the circuit board, the straight angle at which the straight line direction at the tip part makes a perpendicular to the plane of the circuit board, or the straight line connecting the contact point where the curved line contacts the straight part and the tip part of the circuit board The vertical angle formed with the plane is 8 ° or more.

According to a third aspect of the present invention, in the wound inductor, the taper-shaped cross section in which the reduction ratio of the outer diameter gradually decreases is a hyperbolic shape, and the wound inductor is attached to the circuit board. In this case, the vertical angle formed by the straight line connecting the contact point where the hyperbola at the tip part contacts the straight shape part and the tip part with the plane of the circuit board is 8 ° or more.
Furthermore, the wound inductor according to claim 4 of the present invention is characterized in that, in the wound inductor, the tip portion is covered with a winding or solder and the core is not exposed.

According to a fifth aspect of the present invention, there is provided the wound inductor according to the above-described wound inductor, wherein the straight shape portion having a constant outer diameter and the electrode portion extending to the straight shape portion are formed in the tapered shape. A magnetic body or a dielectric body formed integrally with each other, wherein a conductive film is formed on the electrode portion to form an electrode for connection to a circuit board.
Furthermore, the wound inductor according to claim 6 of the present invention is characterized in that, in the wound inductor, a conductive wire is wound around the straight shape portion.

According to a seventh aspect of the present invention, in the wound inductor, the bottom surface soldered to the circuit board of the electrode portion is in a vertical direction in which the linear direction at the tip portion forms a plane of the circuit board. Or a straight line connecting the contact point with the straight shape portion of the curve and the tip portion is formed in a cross section obliquely in accordance with a vertical angle formed with a plane of the circuit board, When the soldering is performed, the bottom surface is parallel to the circuit board plane and is in close contact with the circuit board to be surface-bonded.
Further, in the wound inductor according to claim 8 of the present invention, in the wound inductor, the bottom surface of the electrode portion in the large-diameter direction has an atypical shape that is automatically arranged in a component supply apparatus when supplying the component. Features.

According to a ninth aspect of the present invention, there is provided the wound inductor according to the first aspect, wherein the irregular shape of the bottom surface of the electrode portion in the large diameter direction is a straight line on three sides and is erected on the circuit board. Only the upper side is circular or elliptical.
Still further, in the wound inductor according to claim 10 of the present invention, in the wound inductor, the wound inductor is automatically planted on a circuit board by sandwiching the three sides of the electrode portion with a chuck. It is characterized by joining.

  The winding inductor mounting method according to an eleventh aspect of the present invention is such that a winding core is wound around a core formed in a tapered shape in which the diameter reduction rate of the outer diameter gradually decreases from the large diameter proximal end to the small diameter distal end. When the wire is wired, the diameter of the winding of the conducting wire is not constant but gradually decreases toward the tip, and the core has a straight shape portion having a constant outer diameter at the base end portion and the straight shape portion. And using a wire wound inductor having an electrode portion extending to the surface of the circuit board and soldering both the electrode portion extending to the straight shape portion and the tapered tip portion directly to the terminals of the circuit board. Features.

  Furthermore, the winding type inductor mounting method according to claim 12 of the present invention is such that the bottom surface of the electrode portion in the large-diameter direction has an irregular shape and is automatically arranged in a component supply apparatus when supplying a component, The non-standard shape of the bottom surface of the electrode portion in the large diameter direction is a straight line of the electrode portion using the wound inductor having a circular or elliptical shape only on the upper side when the three sides are straight and are erected on the circuit board. It is characterized in that the sides are sandwiched between chucks and are automatically implanted and joined to the circuit board.

The present invention eliminates the lead wire and eliminates the variation in stray inductance due to the lead wire, thereby providing a wire-wound inductor with stable circuit operation and high reliability, which can be easily manufactured.
In addition, by adopting a structure that can be automatically aligned and easily grasped by the chuck by devising the shape of the base end side electrode part, a wound inductor that can be fully automatically mounted on a circuit board is provided. be able to.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram showing the structure of a wound inductor 1 according to the present invention. In FIG. 1, the wound inductor 1 is formed by winding a conductive wire around a core 2 formed in a tapered shape in which a reduction ratio of an outer diameter gradually decreases from a base end 7 having a large diameter toward a tip 8 having a small diameter. It is a wire-wound inductor, and by winding around the core 2, the diameter of the winding of the conducting wire is not constant but gradually decreases toward the tip 8, and the core 2 has a constant outer diameter. As shown in FIG. 2, both the electrode portion 6 (21 in FIG. 2) and the tapered tip portion 8 (25 in FIG. 2) extending directly to the straight shape portion 9 are directly attached. The terminal of the circuit board 23 is soldered and surface-bonded. As shown in FIG. 1, one end of the winding on the base end side is led out to the back side of the electrode via the winding side 11 of the electrode 6 and the groove at the center of the lower end of the electrode. One end of the winding is soldered to the terminal of the circuit board as indicated by 21 in FIG.

In the wound inductor, the tapered cross-sectional shape in which the reduction ratio of the outer diameter gradually decreases is an arbitrary straight line or a curved shape as shown in FIG. 11, and when attached to the circuit board, the straight line In the case of a shape, the straight line connecting the tip and the contact angle where the straight line at the tip of the tip is perpendicular to the plane of the circuit board or the curve in the case of the curve is in contact with the straight shape. The vertical angle θ formed with the plane of the substrate is 8 ° or more.
In addition, the curved wire-wound inductor has, for example, a taper-shaped cross section in which the diameter reduction rate of the outer diameter gradually decreases, and has a hyperbolic shape when attached to the printed circuit board. A vertical angle θ (24 in FIG. 2) formed by a straight line connecting the contact point where the curved shape is in contact with the straight shape portion and the tip end portion with the plane of the circuit board is 24 ° or more.

FIG. 5 shows frequency characteristics (passage loss) comparing a conventional wound inductor and a wound inductor of the present invention. In FIG. 5, 51 is the conventional wound inductor shown in FIG. 3, and 52 is a characteristic of the wound inductor of the present invention. The size of the wound inductor shown in FIG. 5 is a large diameter 0.8 × small diameter 0.1 × length 3 mm and the number of turns is 38. The measurement circuit is shown in the upper right 53 of the figure.
Obviously, the surface-bonded wound inductor of the present invention has a smaller passage loss, and the difference is particularly remarkable at 40 GHz or higher.

  FIG. 6 shows another comparative example. The size of the wound inductor shown in FIG. 6 is 2 in the large diameter, 0.1 in the small diameter, 5.4 mm in length, and 71 turns. Reference numeral 61 denotes a conventional wound inductor, and 62 denotes the characteristics of the wound inductor of the present invention. Similar to FIG. 5, the surface-bonded wire wound inductor of the present invention has a smaller passage loss, and the difference is particularly remarkable at 25 GHz or more. Similarly, the measurement circuit is shown in the upper right of the figure.

9 and 10, in the case where the straight line connecting the tip and the contact point where the straight line at the tip part abuts the straight shape part and the plane of the circuit board is at an angle of 38 ° (invention), Frequency characteristics were obtained for the case where the tip is floating from the substrate (coil central axis is horizontal) and for the case where the straight line is 0 °, that is, when the wound inductor is mounted in close contact with the circuit board. Results are shown.
The measurement was performed with the circuit 104 in FIG. 9, and the passage loss was measured with the wound inductor of the present invention and a similar wound inductor manufactured by another company.
In FIG. 9, when 100 is the inclination angle of the present invention, 100 is the measurement result when 101 is the contact type, and 102 is the measurement result when the coil central axis is the horizontal type. Similarly, in FIG. 10, when 110 is the inclination angle of 38 °, 111 is a close contact type, and 112 is a horizontal type measurement result of a similar wound inductor manufactured by another company.

As is clear from FIGS. 9 and 10, in the case of the contact type, a large increase in loss is observed at 20 to 25 GHz (105 in FIG. 9 and 115 in FIG. 10). Also in the horizontal type, the loss characteristic of 102 is remarkably reduced in the vicinity of 40 GHz (106 in FIG. 9 and 116 in FIG. 10) as compared with the case of the inclination angle of 38 ° (100 curve) of the product of the present invention.
This is presumably because the electromagnetic field generated by the winding is affected by the metal on the circuit board and the electromagnetic field is deformed. When the inclination angle is 38 °, the base end direction in which the magnetic material or the dielectric material is present is mounted so as to be separated from the circuit board. In the comparison between the horizontal type and the 38 ° type, the difference in the distance to the circuit board having the larger diameter is assumed to be the difference in the characteristics.

FIG. 7 shows measurement results of frequency characteristics when the tilt angle is variously changed for the wound inductor of the present invention.
In FIG. 7, reference numeral 71 denotes an inclination angle of 0 °, that is, a state where the wound inductor is in close contact with the circuit board, 72 denotes the inclination angle of 10 °, 73 denotes the inclination angle of 8 °, and 74 denotes The measurement result when the tilt angle is 16 ° is shown.
In the case of 0 °, loss characteristics are clearly worse than other measurement results at 5 to 10 GHz. However, there is not much difference in characteristics at 8 ° or more. When the inclination angle is increased, the height of the wound inductor when mounted is increased correspondingly, so that a large inclination angle is disadvantageous in mounting.
From the results shown in FIG. 7, it was confirmed that when mounted at an inclination angle of approximately 8 ° or more, the characteristics of the wound inductor are improved without the influence of the circuit board.

Furthermore, in the wound inductor according to the present invention, in the wound inductor, the tip end portion is covered with a winding and the core is not exposed, and the tip end of the winding is all covered with solder plating.
As in the prior art, when the coil is exposed at the tip, a parasitic inductance is generated at the exposed portion. Therefore, all of the coil is covered with solder plating so that the coil is not exposed at the tip. Experiments have confirmed that the characteristics vary when the coil is exposed at the tip.

In the wound inductor according to the present invention, the straight shape portion (9 in FIG. 1) having a constant outer diameter and the electrode portion (3 in FIG. 1) extending to the straight shape portion are formed in the tapered shape. A magnetic body or a dielectric body integrally formed with the core (2 in FIG. 1), and the electrode portion (3 in FIG. 1) is formed with a conductive film 6 to be an electrode 10 for connection to a printed circuit board. It is characterized by. In the wound inductor according to the present invention, a conductive wire is also wound around the straight shape portion 9 in the wound inductor having the above-described configuration. The tip of the winding is connected to the electrode 6 via the winding side 11 (FIG. 1) of the extended electrode portion 3 as described above, and the winding is not exposed like the tip structure. It has become. Accordingly, no parasitic inductance is generated in this portion.
In the case of the conventional wire-wound inductor, even if it is going to be surface-bonded, as shown in FIG. 4, there are coil tips 43 at the tip 44 and the base end 41 of the tip 42, and the exposed portions of these coils are Causes stray inductance.
However, as described above, in the case of the present invention, the leading end of the coil is not exposed to either the tip end portion of the wire wound inductor or the electrode portion extending to the base end portion. Stable circuit operation is achieved.

  In the wound inductor of the present invention, in the wound inductor, the bottom surface 10 soldered to the circuit board of the electrode portion is such that the linear direction at the tip 8 is the plane of the circuit board as shown in FIG. A cross section is shown in FIG. 1 in accordance with a vertical angle or a vertical angle θ formed by a straight line connecting the contact point with the straight shape portion of the curve and the tip portion and a plane of the circuit board. As shown in FIG. 2, when the electrode is soldered to the circuit board, the bottom surface is parallel to the circuit board plane 23 and is in close contact with the circuit board. With this configuration, the electrode portion can be stably surface-bonded to the circuit board.

Furthermore, the wound inductor of the present invention has an atypical shape in which the bottom surface of the electrode portion in the large diameter direction is automatically arranged in the component supply apparatus when supplying the component as shown in FIG. In addition, since the irregular shape of the bottom surface of the electrode portion in the large diameter direction is a circle or an ellipse only on the upper side when the three sides are straight and are erected on the circuit board, it circulates while giving vibration. In the component supply apparatus for supplying components, the direction of the wire-wound inductor can be automatically arranged to be constant, and further, the wire-wound inductor can be arranged in the two sides of the electrode portion (see FIG. 1B). The left and right sides are sandwiched between chucks and can be automatically implanted and joined to the circuit board.
On the other hand, as shown in FIGS. 8 and 13, in the conventional wound inductor, the bottom shape of the core is square or circular. Therefore, since there is no feature in the shape direction, automatic alignment is impossible. If automatic alignment is not possible, full automatic mounting cannot be performed, so production efficiency is poor.
The wound inductor has an irregular shape on the bottom surface of the electrode part as shown in FIG. 1 (b). The three sides are straight and only one side is circular or elliptical. Any other shape may be used.

Recently, electronic devices such as mobile phones and personal computers tend to have higher density, higher frequency, and smaller size. For this reason, wire-wound inductors are also reduced in size, and operation stability and manufacturing in the high-frequency region, especially in the GHz band, are increasing. Ease is required.
The wire-wound inductor of the present invention has high frequency characteristics because unnecessary stray inductance does not occur because of surface bonding, and is fully manufacturable because it can be fully automatically aligned and automatically implanted, thereby reducing the manufacturing cost accordingly. it can.
Therefore, industrial applicability is extremely high.

It is a figure which shows the structure of the winding type | mold inductor 1 of this invention. It is a figure which shows the mounting state of the winding type | mold inductor 1 of this invention. It is a figure which shows the structure and mounting state of the conventional winding type inductor. It is a figure which shows the other mounting example which shows the mounting state of the conventional winding type | mold inductor. It is a figure which shows the frequency characteristic which compared the conventional winding type inductor and the winding type inductor of this invention. It is a figure which shows the other frequency characteristic which compared the conventional winding type inductor and the winding type inductor of this invention. With respect to the wound inductor of the present invention, the vertical angle (inclination angle θ) formed by the straight line connecting the contact point where the straight line or curve of the cross section at the front end part contacts the straight shape part and the plane of the circuit board is varied. It is a figure which shows the measurement result of the characteristic in the case of. It is a figure which shows an example of the conventional winding type | mold inductor. In the case of a wound inductor, a vertical angle (inclination angle θ) formed by a straight line or a curved line at the tip portion and a straight line connecting the tip portion and the contact point contacting the straight shape portion with the plane of the circuit board is 38 ° (this Invention), when the tip is horizontal and is floating from the circuit board (the central axis of the winding is horizontal), and when the straight line is 0 °, that is, the wound inductor is closely attached to the circuit board It is a figure which shows the result of having taken the frequency about each when mounted. It is a figure which shows the result of having measured the characteristic similar to FIG. 9 about the other winding type | mold inductor. It is a figure which shows the various cross-sectional structures of the winding type inductor of this invention. It is a figure which shows the structure of the other conventional winding type inductor. FIG. 13 is a side view of the wire wound inductor of FIG. 12.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Winding type inductor 2 Core 3 Extension part 6 Electrode 8 Tip part 9 Straight part 10 Electrode bottom part 21 Electrode junction 25 Tip junction

Claims (12)

A wound inductor formed by winding a conducting wire around a core formed in a tapered shape in which the diameter reduction rate of the outer diameter gradually decreases from the large base end toward the small tip,
By winding around the core, the diameter of the winding of the conducting wire is not constant but gradually decreases toward the tip, and the core has a straight-shaped portion with a constant outer diameter at the base end. And
A wire-wound inductor characterized in that both the electrode portion extending to the straight shape portion and the tapered tip portion are soldered directly to the terminals of the circuit board and surface-bonded.   The tapered cross-sectional shape in which the reduction ratio of the outer diameter gradually decreases is an arbitrary straight line or curved shape, and when attached to the circuit board, the linear direction at the tip portion is a plane of the printed board. The vertical angle formed by the vertical direction or the vertical angle formed by the straight line connecting the contact point where the curved line contacts the straight shape portion and the tip end portion with the plane of the printed circuit board is 8 ° or more. 1. A wire wound inductor according to 1.   The tapered cross-sectional shape in which the reduction ratio of the outer diameter gradually decreases is a hyperbolic shape, and when attached to the printed circuit board, the hyperbola at the tip portion contacts the straight shape portion and the contact 3. The wire-wound inductor according to claim 2, wherein an angle in a vertical direction formed by a straight line connecting the tip portions with a plane of the printed circuit board is 8 [deg.] Or more.   2. The wound inductor according to claim 1, wherein the tip is covered with a winding or solder and the core is not exposed.   The straight portion having a constant outer diameter and the electrode portion extending to the straight portion are a magnetic body or a dielectric formed integrally with the tapered core, and a conductive film is formed on the electrode portion. The wire-wound inductor according to claim 1, wherein the electrode is used for connection to a circuit board.   6. The wound inductor according to claim 5, wherein a conductive wire is also wound around the straight shape portion.   The bottom surface soldered to the circuit board of the electrode portion is a vertical angle formed by the linear direction of the tip portion with the plane of the printed circuit board, or the contact point with the straight shape portion of the curve and the tip portion. The cross section is diagonally formed in accordance with the vertical angle formed by the connecting line and the plane of the circuit board, and the bottom surface is parallel to the circuit board plane when soldered to the circuit board. 2. The wound inductor according to claim 1, wherein the wire-type inductor is closely bonded to each other.   2. The wound inductor according to claim 1, wherein a bottom surface of the electrode portion in the large diameter direction has an atypical shape that is automatically arranged in a component supply device when supplying a component.   9. The atypical shape of the bottom surface of the electrode portion in the large diameter direction is a circle or an ellipse only on the upper side when the three sides are straight and stand on the circuit board. Wire wound inductor.   10. The wire-wound inductor according to claim 9, wherein the wire-wound inductor is joined by being automatically implanted on a circuit board with the straight sides in the three directions of the electrode portions sandwiched between chucks. The winding diameter of the conducting wire is not constant by winding on a core formed in a tapered shape in which the diameter reduction rate of the outer diameter gradually decreases from the large base end toward the small tip. The core gradually decreases in diameter, and the core uses a wound-type inductor having a straight shape portion having a constant outer diameter at the base end portion and an electrode portion extending to the straight shape portion,
A method of mounting a wound inductor, characterized in that both the electrode portion extending to the straight shape portion and the tapered tip portion are directly soldered to the terminals of the circuit board and surface-bonded.   The bottom surface of the electrode portion in the large-diameter direction has an irregular shape, and is automatically arranged in a component supply apparatus when supplying the component, and the non-uniform shape of the bottom surface of the electrode portion in the large-diameter direction is a straight line on three sides. When using the wound inductor that is circular or elliptical only in the upward direction when standing upright on the circuit board, the linear side of the electrode part is sandwiched between chucks and automatically implanted and joined to the circuit board. 12. The method of mounting a wound inductor according to claim 11, wherein the winding inductor is mounted.