JP2021158314A - Inductor and manufacturing method thereof - Google Patents

Abstract

To provide a higher performance inductor.SOLUTION: An inductor 100 includes an energizing member being made of a metal material and having a main body 40 extending along an energizing direction and a lead-out portion connected to both ends of the main body 40 in the energizing direction, an exterior member 10 being formed using a magnetic material and covering the energizing member, and an electrode member being connected to the lead-out portion and at least partly exposed from the exterior member 10, and in a cross section intersecting the energization direction, the main body 40 has a circular cross section having an opening 45 that becomes narrower toward a center of the main body 40, and an area S1 of the circular cross section has a relationship is 0.75<S1/S2<1.00 with respect to an area S2 of the smallest perfect circle 47 in which the circular cross section fits.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to inductors and methods of manufacturing inductors.

Conventionally, inductors have been introduced into a wide range of electronic devices such as DC-DC converter devices for the purpose of raising and lowering the power supply voltage and smoothing the direct current. Further, in recent years, a high frequency drive type DC-DC converter device or the like in which the switching frequency in the drive circuit of the DC-DC converter device has been increased has become known. Inductors that exhibit low inductance values have also been developed as the switching frequency increases. As a specific inductor structure, for example, Patent Document 1 discloses a magnetic element having a flat plate-shaped energizing member.

International Publication No. 2006/070544

The above-mentioned conventional magnetic element may not have sufficient performance as an inductor. In view of the above, it is an object of the present disclosure to provide a higher performance inductor or the like.

The inductor according to one aspect of the present disclosure includes a main body portion made of a metal material and extending along an energizing direction, an energizing member having lead-out portions connected to both ends of the main body portion in the energizing direction, and a magnetic material. The main body in a cross section intersecting the current-carrying direction, comprising an exterior member formed by using and covering the current-carrying member, and an electrode member connected to the lead-out portion and at least partially exposed from the exterior member. The portion has a circular cross section having an opening that becomes narrower toward the center of the main body portion, and the area S1 of the circular cross section is 0.75 <with respect to the area S2 of the smallest perfect circle in which the circular cross section fits. The relationship is S1 / S2 <1.00.

Further, the method for manufacturing an inductor according to one aspect of the present disclosure is an energizing member made of a metal material and having a main body portion extending along an energizing direction and a lead-out portion connected to both ends of the main body portion in the energizing direction. A method for manufacturing an inductor including an exterior member formed by using a magnetic material and covering the current-carrying member, and an electrode member connected to the lead-out portion and at least partially exposed from the exterior member. By pressing the long plate-shaped metal material in the lateral direction along the plate surface using a press die, the main body is formed by forming a small width and a large thickness. Includes press process.

According to the present disclosure, higher performance inductors and the like are provided.

FIG. 1 is a schematic perspective view showing a configuration of an inductor according to an embodiment. FIG. 2 is a top view, a side view, and a bottom view of the inductor according to the embodiment. FIG. 3 is a cross-sectional view of the inductor in the iii-iii line of FIG. FIG. 4 is a flowchart showing a manufacturing method of the inductor according to the embodiment. FIG. 5 is a diagram illustrating a preparation step among the methods for manufacturing the inductor according to the embodiment. FIG. 6 is a diagram illustrating a preliminary process and a pressing process among the methods for manufacturing the inductor according to the embodiment. FIG. 7 is a diagram illustrating an exterior process among the methods for manufacturing the inductor according to the embodiment. FIG. 8 is a diagram illustrating a finishing process among the methods for manufacturing the inductor according to the embodiment. FIG. 9 is a diagram illustrating the effect of molding the main body according to the embodiment.

(Knowledge that led to disclosure)
The magnetic element disclosed in Patent Document 1 functions as an inductor by covering a flat plate-shaped energizing member with an exterior member. At this time, a magnetic flux is formed so as to orbit around the energizing member. It is also known that the longer the magnetic path length of the magnetic flux, the lower the magnetic efficiency. That is, when a current-carrying member on a flat plate is used for the inductor as disclosed in Patent Document 1, there is a possibility that sufficient magnetic efficiency cannot be obtained. In other words, the magnetic element or the like disclosed in Patent Document 1 may not have sufficient performance as an inductor.

Therefore, in the present disclosure, an inductor in which the magnetic path length is shortened and the magnetic efficiency is improved by processing the energizing member to bring it closer to a shape having a perfect circular cross section (that is, a cylindrical shape) and using the energizing member. explain.

Hereinafter, embodiments will be specifically described with reference to the drawings.

It should be noted that all of the embodiments described below show a specific example of the present disclosure. The numerical values, shapes, materials, components, arrangement positions of the components, connection forms, steps, the order of steps, and the like shown in the following embodiments are examples, and are not intended to limit the present disclosure. Further, among the components in the following embodiments, the components not described in the independent claims will be described as arbitrary components.

In addition, each figure shows an X-axis, a Y-axis, and a Z-axis which mean three directions orthogonal to each other, and these axes are used for explanation as necessary. Each axis is provided for illustration purposes only and does not limit the direction and orientation in which the inductor is used.

(Embodiment)
[composition]
First, the inductor according to the embodiment of the present disclosure will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic perspective view showing a configuration of an inductor according to an embodiment. FIG. 1 shows an outline of the exterior member 10 (for example, a dust core) described later, and further shows the inside of the exterior member 10 through the inside. For example, the components such as the main body 40 hidden by being embedded in the exterior member 10 are shown by broken lines, and express that they can be seen through the exterior member 10.

Further, FIG. 2 is a top view, a side view, and a bottom view of the inductor according to the embodiment. More specifically, FIG. 2A shows a top view of the inductor 100 seen from the Z-axis plus side of FIG. 1, and FIG. 2B shows the inductor 100 seen from the Y-axis minus side of FIG. 2A shows a side view of the inductor 100, and FIG. 2C shows a bottom view of the inductor 100 seen from the negative side of the Z axis of FIG. Further, in FIG. 2, similarly to FIG. 1, the component embedded in the exterior member 10 is shown through a broken line.

As shown in FIGS. 1 and 2, the inductor 100 includes an exterior member 10, a main body 40, a first electrode member 25, and a second electrode member 35.

The inductor 100 is, for example, a rectangular parallelepiped metal composite, and its approximate outer shape is determined by the shape of the exterior member 10. The exterior member 10 can be formed into an arbitrary shape by molding. That is, the inductor 100 having an arbitrary shape can be realized depending on the shape of the exterior member 10 at the time of molding. The inductor 100 is a passive element that stores electrical energy flowing between the first electrode member 25 and the second electrode member 35 as magnetic energy by the main body 40.

The exterior member 10 is an outer shell portion of the inductor 100 that covers the main body portion 40 and the lead-out portions 20 and 30 described later, and is, for example, a dust core made of a metal magnetic material powder, a resin material, or the like. The exterior member 10 may be formed by using a magnetic material, ferrite or the like may be used, or may be other than that.

As the metal magnetic powder, a particulate material having a predetermined elemental composition such as Fe—Si—Al system, Fe—Si system, Fe—Si—Cr system, or Fe—Si—Cr—B system is used. Further, as the resin material, a material such as silicone that can maintain a constant shape by binding the particles of the metallic magnetic material powder while insulating the particles is selected. The exterior member 10 has substantially rectangular facing surfaces (faces on both sides of the X-axis) on which the first electrode member 25 and the second electrode member 35 are formed, and the four sides of each facing surface are top surfaces (top surfaces (faces on both sides of the X-axis). It has the shape of a substantially square column connected by a Z-axis plus side surface), a bottom surface (Z-axis minus side surface), and two side surfaces (Y-axis side surfaces).

In the present embodiment, the inductor 100 has, for example, an exterior member 10 having a dimension of 5.0 mm in the X-axis direction, a dimension of 5.0 mm in the Y-axis direction, and a dimension of 3.0 mm in the Z-axis direction. , Not limited to this. Similar to the above shape, an inductor 100 of an arbitrary size can be realized depending on the dimensions of the exterior member 10. Further, the dimensions of the main body 40, the first electrode member 25, and the second electrode member 35 may be determined according to the shape of the inductor 100.

The main body 40 is realized by a material selected from a metal such as aluminum, copper, silver, and gold, and an alloy composed of the metal and another substance. The main body 40 extends along the energizing direction (X-axis direction in the drawing), and the lead-out portions 20 and 30 are connected to both ends. The main body 40 and the lead units 20 and 30 are also referred to as an energizing member.

Further, the lead-out unit 20 is connected to the first electrode member 25. Further, the lead-out unit 30 is connected to the second electrode member 35. Although details will be described later, in the present embodiment, the main body portion 40, the lead-out portions 20 and 30, and the first electrode member 25 and the second electrode member 35 are integrally formed without having a connecting portion. .. That is, the main body portion 40, the lead-out portions 20 and 30, and the first electrode member 25 and the second electrode member 35 are attached to each portion formed by processing one member made of the same material. It is a name.

The first electrode member 25 and the second electrode member 35 are plate-shaped portions formed by using the same material as the main body portion 40, and at least a part thereof is exposed from the exterior member 10. An external electric component or the like is connected to this exposed portion to form an electric product including an inductor 100. The first electrode member 25 and the second electrode member 35 may be formed separately from the main body portion 40 and may be connected to the main body portion 40 via the lead-out portions 20 and 30.

Further, the first electrode member 25 and the second electrode member 35 extend downward from the connection points with the lead-out portions 20 and 30 along the above-mentioned facing surfaces. The first electrode member 25 and the second electrode member 35 have a first contact 27 and a second contact 37 that extend along the lower surface by being bent in accordance with the bending of the facing surface and the lower surface. By arranging the contacts of the electrode members on the lower surface side in this way, it is possible to directly connect to a land (not shown) such as a mounting board on which the inductor 100 is mounted.

Here, as shown in FIG. 2C, the main body 40 has an opening 45 formed over the entire length of the main body 40 along the energizing direction. This opening will be described with reference to FIG. FIG. 3 is a cross-sectional view of the inductor in the iii-iii line of FIG. FIG. 3 shows a cross section of the inductor 100 cut in a plane intersecting the energization direction (orthogonal as an example). In FIG. 3, an overall cross-sectional view of the inductor 100 is shown on the left side, and an enlarged cross-sectional view of the vicinity of the main body 40 is shown on the right side. In FIG. 3, the mutual relationship is shown by connecting the corresponding points between the overall cross-sectional view and the enlarged cross-sectional view with a two-dot chain line.

As shown in FIG. 3, the main body 40 has an inverted V-shaped opening 45 that narrows toward the center of the main body 40 in a cross-sectional view, and the main body 40 has a cross-sectional shape approaching a circle as described above. It is processed and formed in this way. The opening 45 is a processing mark formed in association with the processing. Further, the main body 40 has a circular cross section having an opening 45 in this way. Here, as shown in the enlarged cross-sectional view, the circular cross section of the main body portion 40 fits in the perfect circle 47 indicated by the alternate long and short dash line circle. This perfect circle corresponds to the cross-sectional shape of the mold defined by the press dies 55 and 57 (see FIG. 6 described later) used for processing the main body 40.

The opening 45 is filled with a part of the exterior member 10, and has a shape without space. According to this, it is possible to suppress heat generation of the inductor 100 due to the heat insulating effect when a space is formed.

Here, when the performance of the inductor 100 is taken into consideration, the area S1 of the circular cross section of the main body 40 has a predetermined magnitude relationship with the area S2 of the perfect circle 47. The magnitude relationship between the area S1 and the area S2 will be described in detail in Examples described later.

[Production method]
Next, the above-mentioned manufacturing method of the inductor 100 will be described with reference to FIGS. 4 and 8 as appropriate. FIG. 4 is a flowchart showing a manufacturing method of the inductor according to the embodiment. In the manufacture of the inductor 100 according to the present embodiment, first, a metal material including the main body portion 40, the lead-out portions 20 and 30, and the first electrode member 25 and the second electrode member 35 is prepared (preparation step S101). ).

Here, FIG. 5 is a diagram illustrating a preparation step among the methods for manufacturing the inductor according to the embodiment. As shown in FIG. 5, in the preparation step S101, the mold 62 shown by the broken line is punched out from the metal plate 61, and the main body portion 40, the lead-out portions 20 and 30, and the first electrode member 25 and the second electrode member 35 are formed. The containing metal material 63 is obtained. Since the metal material 63 is only punched from the metal plate 61, the shape of the main body 40 is plate-shaped.

With reference to FIG. 4 again, following the preparation step S101, the long plate-shaped metal material 63 (particularly the main body portion 40) is bent in the direction in which both ends in the lateral direction intersect the plate surface (preliminary step S102). ). Further, in the manufacture of the inductor 100, the width is reduced and the thickness is reduced by pressing the long plate-shaped metal material 63 in the lateral direction along the plate surface using the press dies 55 and 57. The shape of the main body 40 is made larger and closer to the cylindrical shape (pressing step S103). The preliminary step S102 is performed before the pressing step S103.

Here, FIG. 6 is a diagram illustrating a preliminary process and a pressing process among the methods for manufacturing the inductor according to the embodiment. FIG. 6 shows the main body portion 40 processed in the preliminary step S102 and the pressing step S103 in the order of (a) to (f). The main body 40 shown in FIG. 6 corresponds to the cross-sectional view taken along the vi-vi line of FIG. 5, and shows how the cross-sectional view is deformed by processing.

In FIG. 6A, the main body 40 of the metal material 63 punched in the preparation step S101 is shown. Next, as shown in FIG. 6B, in the preliminary step S102, the end portion of the main body 40 in the left-right direction of the paper surface is bent in the direction intersecting the plate surface (downward of the paper surface in the drawing). For bending, for example, dies 51 and 53 are used. By bending the end portion in this way, the direction of deformation of the main body portion 40 in the pressing step S103 can be controlled.

Next, as shown in FIGS. 6 (c) to 6 (f), in the pressing step S103, the main body 40 is subjected to the press dies 55 and 57 in a direction along the plate surface and intersecting the energization direction (that is,). Pressing is performed on the elongated metal material 63 (in the lateral direction). Each of the press dies 55 and 57 is formed with dies 56 and 58 having a semicircular cross section. That is, the press die 55 is an example of the first die, and the press die 57 is an example of the second die.

By aligning the press dies 55 and 57 with each other, a space having a circular cross section is formed by the dies 56 and 58. The main body 40 is arranged in this space and is pressed. Since the width of the main body 40 is longer than the circular diameter of the molds 56 and 58, the main body 40 is crushed and deformed in the width direction. That is, the width of the main body becomes smaller. The crushed main body 40 is deformed so that the meat portion that has lost its place escapes in the vertical direction of the paper surface, and approaches the circular shape of the molds 56 and 58. At this time, the bent end portion in the preliminary step S102 is deformed along the inner surfaces of the molds 56 and 58. The bending direction of the end portion of the main body portion 40 acts to define the direction (upward or downward direction of the paper surface) when deforming along the inner surfaces of the molds 56 and 58.

At this time, if there is a difference in size between the cross section of the main body 40 and the circular shape of the molds 56 and 58, a space having an inverted V-shaped cross section is formed near the center approximately equidistant from both ends. This space corresponds to the opening 45 described above.

With reference to FIG. 4 again, following the pressing step S103, the main body portion 40 and the lead-out portions 20 and 30 are covered with the exterior member 10 (exterior step S104).

Here, FIG. 7 is a diagram illustrating an exterior process among the methods for manufacturing the inductor according to the embodiment. In FIG. 7, the product in the process of manufacturing the inductor 100 in the exterior step S104 from the same viewpoint as in FIG. 2B is shown by changing the direction so that the Z axis is in the vertical direction on the paper surface. As shown in FIG. 7, in the exterior step S104, the processed main body 40 and the lead-out portions 20 and 30 of the metal material 63 are covered with a dust core to determine the outer shape of the inductor 100. ..

With reference to FIG. 4 again, following the exterior step S104, the first electrode member 25 and the second electrode member 35 are bent (finishing step S105).

Here, FIG. 8 is a diagram illustrating a finishing process among the methods for manufacturing the inductor according to the embodiment. FIG. 8 shows the inductor 100 in the finishing step S105 from the same viewpoint as in FIG. 7. As shown in FIG. 8, the broken line first electrode member 25 and the second electrode member 35 in the drawing are bent along the exterior member 10. The first contact 27 and the second contact 37 are also formed by bending in the finishing step S105. In this way, the inductor 100 according to the embodiment is manufactured.

Hereinafter, an embodiment of the exterior member 10 based on the above embodiment will be described in detail.

(Example)
In the following examples, three types of metal materials 63 were prepared so that the widths of the main body 40 were 1.1 mm, 1.3 mm, and 1.5 mm from a copper metal plate 61 having a thickness of 2.0 mm. The length of the energizing member including the main body portion 40 and the lead-out portions 20 and 30 was designed to be 5.0 mm in accordance with the dimensions of the exterior member of the above embodiment. Using the press dies 55 and 57 having a circular radius of 0.3 mm by the dies 56 and 58, the main body 40 of the above three kinds of metal materials 63 is processed to obtain the three kinds of inductors according to the examples. Created.

As the exterior member 10, a powder magnetic core containing a Fe—Si—Cr-based metal magnetic material powder and a silicone resin added so as to have a final content of 25% by volume was used. The dust core was compression-molded at a pressing force of 4 ton / cm ² to form a shape having the same dimensions of 5.0 mm × 5.0 mm × 3.0 mm as in the above embodiment. After compression molding, heat treatment was performed for 2 hours under a temperature condition of 200 ° C.

The inductance value was measured using an LCR meter under the condition of a frequency of 100 kHz, and the DC resistance was measured using a DC resistance meter. Further, the cross section of the produced inductor was observed with a microscope, and the area S1 of the cross section was calculated by image analysis. As the area of the smallest perfect circle in which the circular cross section fits, the area of a circle having a radius of 0.3 mm was used from the circular design values of the press dies 55 and 57 used for manufacturing the inductors by the dies 56 and 58.

Further, as a comparative example, an inductor was produced by forming an exterior member without processing the main body 40 of the above three types of metal materials 63. The inductance value was also measured for the inductor according to the comparative example.

The above results are summarized in FIG. FIG. 9 is a diagram illustrating the effect of molding the main body according to the embodiment. In FIG. 9, the result of the inductor having a width of 1.1 mm in the main body 40 in the second column (hereinafter referred to as sample No. 1) is shown in the third column, and the inductor having a width of 1.3 mm in the main body 40 in the third column (hereinafter referred to as sample No. 1). , Sample No. 2) is shown in the fourth column, respectively, and the result of the inductor having a width of the main body 40 of 1.5 mm (hereinafter referred to as Sample No. 3) is shown.

Sample No. The inductor of 1 had a ratio of the area S2 to the area S1 of 0.76. Sample No. With the inductor of 1, the inductance value can be improved in the embodiment as compared with the comparative example. In addition, sample No. In the inductor of 2, the ratio of the area S2 to the area S1 was 0.87. Sample No. In the inductor of 2, the inductance value can be improved in the embodiment as compared with the comparative example. In addition, sample No. In the inductor of No. 3, the ratio of the area S2 to the area S1 was 0.99. Sample No. In the inductor of No. 3, the inductance value can be improved in the embodiment as compared with the comparative example.

As described above, the sample No. S1 / S2 is 0.76, which is larger than 0.75. In the inductor of No. 1, an improvement in the inductance value was confirmed, and Sample No. 1 in which S1 / S2 was 0.99, which was smaller than 1.00. It was confirmed that the inductance value of the inductor of No. 3 was improved. That is, in the inductor having the relationship of the area S1 and the area S2 satisfying 0.75 <S1 / S2 <1.00, the effect of processing the main body 40 was confirmed.

In addition, sample No. The inductor of No. 1 is the sample No. Although the inductance value can be made larger than that of the inductor of No. 3, the influence of loss (heat loss, etc.) due to the increase in DC resistance is likely to occur. Therefore, the sample No. Inductor of No. 2 and sample No. The inductor of No. 3 is considered to be a higher performance inductor in practical use.

As described above, the sample No. S1 / S2 is 0.87, which is larger than 0.86. In the inductor of 2, a practically higher performance inductor can be obtained, and Sample No. 2 in which S1 / S2 is 0.99, which is smaller than 1.00. In the inductor of No. 3, a practically higher performance inductor was obtained. That is, in the inductor having the relationship of the area S1 and the area S2 satisfying 0.86 <S1 / S2 <1.00, a practically higher performance inductor was obtained due to the effect in the processing of the main body 40. ..

[Effects, etc.]
As described above, the inductor 100 according to the present embodiment is made of a metal material, has a main body portion 40 extending along the energization direction, and lead-out portions 20 and 30 connected to both ends of the main body portion 40 in the energization direction. The first electrode member 25 and the first electrode member 25 and the first electrode member 10 formed by using a magnetic material and connected to the lead-out portions 20 and 30 and exposed at least a part from the exterior member 10. The main body 40 has a circular cross section having an opening 45 that becomes narrower toward the center of the main body 40 in a cross section that includes the two electrode members 35 and intersects the energization direction, and the area S1 of the circular cross section is circular. The relationship is 0.75 <S1 / S2 <1.00 with respect to the area S2 of the smallest perfect circle 47 in which the cross section fits.

Such an inductor 100 has a shorter magnetic path length than an inductor using a flat plate energizing member, and the inductance value can be increased even if an energizing member having the same volume is used. Therefore, a higher performance inductor 100 can be realized.

Further, for example, the area S1 may have a relationship of 0.86 <S1 / S2 <1.00 with respect to the area S2.

According to this, the inductor 100 having higher performance in practical use can be realized. Therefore, a higher performance inductor 100 can be realized.

Further, for example, the opening 45 may be filled with a part of the exterior member 10.

According to this, it is possible to suppress heat generation of the inductor 100 due to the heat insulating effect when a gap is generated in the space formed by the opening 45. Therefore, a higher performance inductor 100 with less temperature rise can be realized.

Further, the method for manufacturing the inductor 100 in the present embodiment includes a main body portion 40 made of a metal material and extending along the energization direction, and lead-out portions 20 and 30 connected to both ends of the main body portion 40 in the energization direction. A first electrode member and a second electrode member formed by using a current-carrying member and a magnetic material and connected to an exterior member 10 covering the current-carrying member and the lead-out portions 20 and 30, and at least a part of which is exposed from the exterior member 10. A method for manufacturing an inductor 100 including 35, wherein a long plate-shaped metal material 63 is press-processed in the lateral direction along the plate surface by using press dies 55 and 57 to increase the width. The press step S103 is included in which the main body 40 is formed by molding a small body and a large thickness.

According to this, the magnetic path length of the inductor 100 can be improved and the magnetic efficiency can be improved by simply pressing the portion of the main body 40. Therefore, a higher performance inductor 100 can be manufactured only by simple processing.

Further, for example, a preliminary step S102 may be included in which the long plate-shaped metal material 63 is bent in a direction in which both ends in the lateral direction intersect the plate surface before the pressing step S103.

According to this, the shape of the main body 40 formed by processing can be controlled. Since the shape variation of the main body 40 is suppressed, a higher performance inductor 100 can be stably manufactured.

Further, for example, the preparatory step S101 for preparing the metal material 63 is included by punching out the metal plate 61 by integrally including the energizing member and the portions corresponding to the first electrode member 25 and the second electrode member 35. It may be.

According to this, the energizing member and the first electrode member 25 and the second electrode member 35 can be integrally formed. When these are used as separate members, the production lines provided individually are not required, so that the production cost can be suppressed and the process can be simplified. Therefore, a higher performance inductor 100 can be easily manufactured.

Further, for example, the press dies 55 and 57 used in the press step S103 include a first die having a semicircular cross section intersecting the energization direction and a semicircular die having a cross section intersecting the energization direction. You may have a second mold to have.

According to this, the shape of the main body 40 can be made close to the cylindrical shape by using the press dies 55 and 57. Therefore, a higher performance inductor 100 can be easily manufactured.

Further, for example, after the pressing step S103, the exterior step S104 may be included in which the energizing member is covered with the exterior member 10.

According to this, the inductor 100 including the exterior member 10 can be manufactured.

Further, for example, after the exterior step S104, a finishing step S105 that bends the first electrode member 25 and the second electrode member 35 exposed from the exterior member 10 may be included.

According to this, it is possible to manufacture a compact inductor 100 in which the first electrode member 25 and the second electrode member 35 extend along the outer surface of the exterior member 10.

(Other embodiments, etc.)
Although the inductor and the like according to the embodiment of the present disclosure have been described above, the present disclosure is not limited to this embodiment.

For example, an electric product or an electric circuit using the above-mentioned inductor is also included in the present invention. Examples of the electric product include a power supply device provided with the above-mentioned inductor.

Further, the present disclosure is not limited to this embodiment. As long as the gist of the present disclosure is not deviated, various modifications that can be conceived by those skilled in the art are applied to the present embodiment, and a form constructed by combining components in different embodiments is also within the scope of one or more embodiments. May be included within.

The inductor according to the present disclosure is useful as an inductor for high frequencies.

10 Exterior member 20, 30 Derivation part 25 1st electrode member 27 1st contact 35 2nd electrode member 37 2nd contact 40 Main body 45 Opening 47 Perfect circle 51, 53 Mold 55, 57 Press mold 56, 58 type 61 Metal plate 62 Formwork 63 Metal material 100 inductor

Claims (9)

An energizing member made of a metal material and having a main body extending along the energizing direction and a lead-out portion connected to both ends of the main body in the energizing direction.
An exterior member formed using a magnetic material and covering the current-carrying member,
An electrode member connected to the lead-out portion and at least partially exposed from the exterior member.
In the cross section intersecting the energizing direction, the main body portion has a circular cross section having an opening that becomes narrower toward the center of the main body portion.
The area S1 of the circular cross section is relative to the area S2 of the smallest perfect circle in which the circular cross section fits.
0.75 <S1 / S2 <1.00
Inductor that is related to. The area S1 is relative to the area S2.
0.86 <S1 / S2 <1.00
The inductor according to claim 1, which is related to the above. The inductor according to claim 1 or 2, wherein the opening is filled with a part of the exterior member. An energizing member made of a metal material and having a main body extending along the energizing direction and a lead-out portion connected to both ends of the main body in the energizing direction.
An exterior member formed using a magnetic material and covering the current-carrying member,
A method for manufacturing an inductor including an electrode member connected to the lead-out portion and at least partially exposed from the exterior member.
A press that uses a press die to press a long plate-shaped metal material in the lateral direction along the plate surface to form the main body portion by forming a small width and a large thickness. A method of manufacturing an inductor that includes a process. The method for manufacturing an inductor according to claim 4, further comprising a preliminary step of bending the long plate-shaped metal material in a direction in which both ends in the lateral direction intersect the plate surface prior to the pressing step. The method for manufacturing an inductor according to claim 4 or 5, further comprising a preparatory step of preparing the metal material by integrally including and punching a portion corresponding to the current-carrying member and the electrode member from a metal plate. The press die used in the press process is
The item according to any one of claims 4 to 6 having a first mold having a semicircular mold having a cross section intersecting the energizing direction and a second mold having a semicircular mold having a cross section intersecting the energizing direction. The method of manufacturing an inductor according to the description. The method for manufacturing an inductor according to any one of claims 4 to 7, further comprising an exterior step of covering the current-carrying member with the exterior member after the pressing step. The method for manufacturing an inductor according to any one of claims 4 to 8, further comprising a finishing step of bending the electrode member exposed from the exterior member after the exterior step.

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