JP2017108059A - Coil component and method of manufacturing the same, electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an air-core coil by reducing the space of a lead-out part, while improving the stability of the lead-out position when forming a magnetic material.SOLUTION: In a coil component 10, an air-core coil 20 having a circulation part 22 where a conductor is circulated, and a pair of lead-out parts 26A, 26B to be led out from the opposite ends thereof is embedded in a magnetic material 12 composed of metal particles and resin, and a pair of terminal electrodes 14, 16 is connected with the pair of lead-out parts 26A, 26B. The magnetic material 12 is a rectangular prism having long side and short side, and when the face of the magnetic material 12, on the side mounted on the substrate, is sectioned into four areas by two diagonals Da, DB, the lead-out parts 26A, 26B are included, respectively, in two areas ES1, ES2 on the short side. More specifically, since the lead-out parts 26A, 26B are placed closer to the short side of the magnetic material 12, space saving of the lead-out parts 26A, 26B is possible. Furthermore, stability of the lead-out position is increased.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coil component, a method for manufacturing the same, and an electronic device, and more specifically to an extraction structure for an air-core coil.

  As the performance of electronic devices such as portable devices increases, parts used in the electronic devices are also required to have high performance. However, as the performance of electronic devices increases, the number of components also increases, and the movement of miniaturization of components themselves is increasing. The same applies to coil parts with high current characteristics using windings, and measures to further reduce the size are being studied.

  In order to obtain high current characteristics, there have been many coil parts that use a rectangular conductive wire called a flat wire. However, although it is relatively easy to form the winding portion of the air-core coil, it is not easy to stably connect the lead portion to the terminal electrode, and a method of forming the lead portion in a direction in which the conductor is easily routed. Has been taken. For example, in Patent Document 1 below, as shown in FIGS. 8 and 9 of the same document, a lead wire having a flat cross section is formed on a tablet formed in a shape having a columnar convex portion on a flat peripheral edge portion. A structure is shown in which a wound coil is placed, both end portions of the coil are along the outer side surface of the columnar convex portion of the tablet, and a part thereof is exposed from the sealing material and connected to an external electrode. .

JP 2010-245473 A (FIGS. 8 and 9)

  In the technique described in Patent Document 1 described above, in order to stabilize the drawer portion, a tablet is used as shown in FIG. 8 of the same literature, and molding is performed by a method of positioning the drawer portion using this surface. The drawer position can be stabilized. However, as shown in FIG. 9 of the same document, a large space (see “12a” in FIG. 9) is required outside the air-core coil. This was a limitation in promoting miniaturization. For this reason, ensuring the stability of the extraction position at the time of magnetic body formation became a subject, saving space in an extraction part.

  The present invention pays attention to the above points. In the air-core coil, the coil part is reduced in size by reducing the space of the lead-out part, and the coil part has high stability of the lead-out position when the magnetic body is formed. It is an object of the present invention to provide a manufacturing method thereof. Another object is to provide an electronic device using the coil component.

  The coil component of the present invention has a rectangular parallelepiped magnetic body formed of metal magnetic particles and resin, a circular portion embedded in the magnetic body, a long side and a short side, and the magnetic side on the side mounted on the substrate. When the surface of the body is divided into four areas by two diagonal lines, they are included in two areas on the short side of the four areas, respectively, and are drawn out from both ends of the circumferential portion to the outside of the magnetic body An air-core coil having a pair of lead portions and a pair of terminal electrodes electrically connected to the lead portion.

  One of the main forms is characterized in that the pair of lead portions are in a position in contact with the outer peripheral surface of the rotating portion when viewed from the surface of the magnetic body on the side mounted on the substrate. One of the other forms is characterized in that an inner peripheral shape of the circular portion viewed from the surface of the magnetic body mounted on the substrate is an oval or a rounded rectangle. Still another embodiment is characterized in that the pair of terminal electrodes are formed on the surface of the magnetic body mounted on the substrate. An electronic apparatus according to the present invention includes any one of the coil components described above.

  In the coil component manufacturing method of the present invention, a winding portion is formed by winding a conducting wire, and when viewed from the coil axis direction formed by the winding portion, the respective conducting wires drawn from both ends of the winding portion intersect. While pulling in the direction away from the outer peripheral surface of the winding part while holding a portion, and further toward the end of the conductive wire, each forming a predetermined gap between the outer peripheral surface of the winding part, and in the opposite direction, and A first step of forming a pair of lead lines that are bent so as to be parallel to each other, and a pair of lead portions parallel to the coil axis and facing in the same direction are formed by bending the ends of the pair of lead lines. A second step of bending, a third step of bending the intersecting portion of the pair of lead lines to be along the outer peripheral surface of the rotating portion, and maintaining the pair of lead portions parallel to the coil axis The fourth bending is performed so as to approach the loop portion. While monitoring the position of the surrounding portion and the pair of lead portions, the air core coil formed in the first to fourth steps was set in the mold, and a magnetic material made of metal particles and resin was embedded. And a fifth step of molding the magnetic body.

  In another aspect of the present invention, the coil component manufacturing method includes winding a conductive wire to form a winding portion, and the respective lead wires drawn from both ends of the winding portion are viewed from the coil axis direction formed by the winding portion. It is pulled out in the direction away from the outer peripheral surface of the winding portion while having an intersecting portion, and further toward the end of the conducting wire, forming a predetermined gap with the outer peripheral surface of the winding portion, respectively, in opposite directions, And a first step of forming a pair of leader lines that are bent so as to be parallel to each other, and bending the end portions of the pair of leader lines so as to form a pair of lead portions parallel to the coil axis and facing in the same direction. A second step of forming, a third step of bending the pair of lead portions so as to approach the loop portion while maintaining the pair of lead portions parallel to the coil axis, and a bending portion of the intersection of the pair of lead lines And the second part along the outer peripheral surface of the rotating part. The air core coil formed in the first to fourth steps is set in the mold while monitoring the process and the positions of the rotating part and the pair of lead parts, and a magnetic material made of metal particles and resin is embedded. And a fifth step of molding the magnetic body. The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

  According to the coil component of the present invention, the pair of lead portions is disposed near the short side of the magnetic body, and space saving of the lead portion is possible. Thereby, the ratio which the magnetic body of the outer side of an air core coil accounts can be made small, and a useless magnetic body can be decreased. As a result, current characteristics can be improved. In addition, the polishing of the extraction portion is easy, and the stability of the extraction position can be increased.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the coil components of Example 1 of this invention, (A) is a top view, (B) is a side view which looked at the said (A) from the arrow F1 direction, (C) is a rectangular wire which forms a coil It is a figure which shows no cross-sectional shape. It is a figure which shows the manufacture procedure of the surrounding part of the air-core coil of this invention. It is a figure which shows the manufacture procedure of the extraction part of the air-core coil of this invention. It is a figure which shows the specific example of the air-core coil of this invention, (A) and (B) are figures which show the planar shape of the air-core coil manufactured by the manufacturing method of Example 1, (C)-(E) It is a figure which shows the planar shape of the air-core coil manufactured with the manufacturing method of Example 2. FIG. It is a top view which shows the specific example of this invention. It is a table | surface which shows the area ratio of the magnetic body of the circumference part by the difference in the dimension of the specific example of this invention, and a circumference part, and a circumference part.

  Hereinafter, the best mode for carrying out the present invention will be described in detail based on examples.

  First, the basic structure of the coil component of the present invention will be described with reference to FIG. 1A and 1B are views showing a coil component of Example 1, wherein FIG. 1A is a plan view, FIG. 1B is a side view of FIG. 1A viewed from the direction of arrow F1, and FIG. It is a figure which shows the cross-sectional shape of the flat wire to do. As shown in FIG. 1A, the coil component 10 of this embodiment is called a chip type, and has a configuration in which an air-core coil 20 is embedded in a rectangular parallelepiped magnetic body 12 having a long side and a short side. It has become. Specifically, it is a small coil component having a long side of 2.0 mm or less. The magnetic body 12 is made of resin and metal particles. The magnetic body 12 has terminal electrodes 14 and 16 on both sides of a surface (surface shown in FIG. 1A) mounted on a substrate (not shown). The portions 26A and 26B are connected to the terminal electrodes 14 and 16.

  In the present invention, the magnetic body 12 has a rectangular parallelepiped shape and has long sides 12A and 12B and short sides 12C and 12D. The surface mounted on the substrate is defined by two diagonal lines DA and DB. It can be divided into four areas. That is, the area is divided into areas EL1 and EL2 on the long side 12A and 12B side and areas ES1 and ES2 on the short side 12C and 12D side. The pair of lead portions 26A and 26B are included in the areas ES1 and ES2 on the short side 12C and 12D side. Here, “included” means that the lead-out portions 26A and 26B are on the diagonal lines DA and DB and a part thereof is in the areas ES1 and ES2, and that the drawers 26A and 26B are completely contained in the areas ES1 and ES2. Both are included. An example that is completely contained will be described in a specific example described later.

  Next, the manufacturing method of the coil component of the present Example 1 is demonstrated with reference to FIG.2 and FIG.3. FIG. 2 is a diagram showing a procedure for winding the air-core coil, and FIG. 3 is a diagram showing a procedure for forming the lead-out portion of the air-core coil. 3 (C-2) to (E-2) will be described in the second embodiment. In the present embodiment, as shown in FIG. 1 (C), as a conducting wire for winding of the air-core coil 20, a cross section of a conducting wire called a flat wire has long sides 30C and 30D and short sides 30A and 30B. A quadrangular surface with a coating film for insulation was used. The air-core coil 20 is formed by a winding portion 22 wound with a flat wire 30 and lead portions 26A and 26B connecting the winding portion 22 and the terminal electrodes 14 and 16. The circumference portion 22 was formed by a method called α winding.

  Specifically, as shown in FIG. 2A, an iron core 40 called an oval (oval type) is prepared to make the air-core coil 20, and the rectangular wire is formed around the iron core 40. It winds so that the surface of one long side of the cross section of 30 may contact | connect, and the rectangular wire 30 is repeatedly wound so that it may overlap on the wound rectangular wire 30 further. In other words, the rectangular wire 30 overlaps from the inside toward the outside to form the circumferential portion 22. At this time, as the flat wire 30, the length necessary for forming the winding portion 22 and the lead portions 26 </ b> A and 26 </ b> B is used, and the lead portions 26 </ b> A and 26 </ b> B are formed from both ends of the flat wire 30. As shown in FIG. 2 (A), the intermediate point of the part where the necessary length is subtracted is applied to the iron core 40, and both ends of each rectangular wire 30 are in the opposite direction around the iron core 40. It is wound by moving.

  With respect to the winding direction, winding is performed in the opposite directions around the iron core 40, thereby forming the winding portion 22 in which the winding portions 22A and 22B having the opposite winding directions are continuous (FIG. 2B). And (C)). The inner peripheral shape of the winding part 22 obtained as described above is formed by the winding part 22 of the air-core coil 20 using an iron core 40 having an oval cross section (oval type) as the winding axis of the flat wire 30. The coil shaft 29 (see FIG. 1A) has an inner circumferential shape in the axial direction of the coil shaft 29, two semicircular arcs at the ends of two linear long axes LA, and a short axis LB. The oval shape has

  Next, the lead portions 26 </ b> A and 26 </ b> B are formed on both end sides of the circulating portion 22. First, the both ends of the circumferential portion 22 are pulled out so as to intersect when viewed from the axial direction of the coil shaft 29. That is, the end portions 28A and 28B of the lead lines 24A and 24B are drawn out away from the coil shaft 29 when viewed from the short axis LB side. As shown in FIG. 3A, the end portions 28A and 28B of the pair of lead wires 24A and 24B are separated from the outer peripheral surface of the circulating portion 22 by one or more conductors (interval d) and are parallel to each other. The lead wires 24A and 24B are bent so as to be (first forming). Specifically, as shown in FIG. 3A, bending is performed at intersections 23A and 23B of the leader lines 24A and 24B and positions PA and PB that are the bases of the leaders 26A and 26B.

  Next, as shown in FIG. 3 (B), the pair of lead wires 24A and 24B are bent in the same direction at the positions PA and PB which are the bases of the lead portions 26A and 26B, and are parallel to the coil shaft 29. A pair of leading portions 26A and 26B are formed (second forming). Then, as shown in FIG. 3 (C-1), the intersecting portions 23A and 23B of the pair of lead lines 24A and 24B are bent and processed into a flat shape along the outer peripheral surface of the rotating portion 22. (Third forming).

  Then, as shown in FIG. 3 (D-1), the pair of lead lines 24A, 26A, 26B, 26A, 26B are arranged so as to approach the circuit portion 22 while keeping the pair of lead parts 26A, 26B parallel to the coil shaft 29. 24B is bent (fourth forming). The air-core coil 20 having the lead portions 26A and 26B formed as described above is set in a mold while monitoring the positions of the loop portion 22 and the pair of lead portions 26A and 26B (FIG. 3 (E-1 )), Using a magnetic material in which metal particles and resin are kneaded (molding step).

  As described above, according to the first embodiment, the air core coil 20 including the loop portion 22 that circulates the conducting wire and the pair of lead portions 26A and 26B that is pulled out from both ends of the loop portion 22 is formed from the metal particles and the resin. In the coil component 10 having a pair of terminal electrodes 14 and 16 embedded in the magnetic body 12 and connected to each of the pair of lead portions 26A and 26B, the magnetic body 12 is a rectangular parallelepiped having a long side and a short side. Yes, when the surface of the magnetic body 12 on the side mounted on the substrate is divided into four areas by two diagonal lines DA and DB, the pair of leading portions 26A and 26B Are included in the two areas ES1 and ES2 on the short side, respectively.

(1) The pair of lead portions 26A and 26B is disposed near the short side of the magnetic body 12, and the space of the lead portions 26A and 26B can be saved. Thereby, the ratio which the magnetic body of the outer side of the air-core coil 20 occupies can be made small, and a useless magnetic body can be decreased. This leads to an increase in the air core coil 20 within the product size, and the difference between the ratio of the magnetic body outside the air core coil 20 and the ratio of the magnetic body inside the air core coil 20 can be reduced. The characteristics can be increased. Specifically, the ratio “S3 / S1” of S3 of the inner circumference of the circumference portion to the area S1 outside the circumference portion can be set to 0.38 or more. The ratio of S3 inside the circulation portion can be increased more than ever.
(2) By forming the extraction portions 26A and 26B in the above-described procedure, the extraction portions 26A and 26B can be easily polished, and the extraction portion 26A can be accurately and reliably performed by a relatively simple method. , 26B can be exposed on the surface of the magnetic material. In addition, since the position accuracy of the lead portions 26A and 26B can be easily obtained, positioning at the stage of embedding in the magnetic material can be performed while monitoring the lead portions 26A and 26B. 14 and 16 can be connected. This is because when the amount of polishing in the above-described prior art drawer portion is insufficient, the exposure of the drawer portion becomes insufficient, and conversely, if the surface is excessively shaved, the extraction position may change. This is because such inconvenience does not occur.
(3) Since the inner peripheral shape of the revolving part 22 is an oval (oval type), the ratio of the inner peripheral area can be further increased to contribute to the improvement of current characteristics.

  Next, a second embodiment of the present invention will be described. In addition, the same code | symbol is used for the component which is the same as that of Example 1 mentioned above, or respond | corresponds (it is the same also about the following specific examples). In the above-described first embodiment, when forming the pair of lead portions 26A and 26B, the intersecting portions 23A and 23B are bent so as to be planar along the outer peripheral surface of the rotating portion 22 (first embodiment). The third forming), and the lead wires 24A and 24B were bent so that the lead portions 26A and 26B approach the rotating portion 22 (fourth forming in the first embodiment). In this embodiment, the third forming process and the fourth forming procedure are reversed to improve the bending accuracy, and it is difficult to generate a gap between the outer peripheral surface of the rotating part 22 and the lead-out parts 26A, 26B. is there.

  3 (C-2) to (E-2) show an example of the manufacturing procedure of the coil component of this embodiment. In addition, the formation procedure of the surrounding part 22 of the air-core coil 20 is the same as that of Example 1 mentioned above, Since the process of FIG. 3 (A) and (B) is also the same as Example 1, description is abbreviate | omitted. In the process up to FIG. 3B, when the lead-out portions 26A and 26B are formed by bending the lead-out wires 24A and 24B drawn from the winding portion 22, in this embodiment, as shown in FIG. 3C-2. In addition, the pair of lead wires 24A and 24B are bent so as to approach the circuit portion 22 while keeping the pair of lead portions 26A and 26B parallel to the coil shaft 29. The bending angle α at this time is, for example, 20 ° to 80 °. Then, as shown in FIG. 3 (D-2), the intersection portions 23A and 23B of the pair of lead lines 24A and 24B are bent to form a planar shape along the outer peripheral surface of the circumferential portion 22. To process. The air-core coil 20 in which the lead portions 26A and 26B are formed as described above is set in a mold while monitoring the positions of the circumferential portion 22 and the pair of lead portions 26A and 26B (FIG. 3 (E-2 )), Using a magnetic material in which metal particles and resin are kneaded (molding step).

  In the present embodiment, since the gap between the outer peripheral surface of the circulating portion 22 and the lead portions 26A and 26B can be further reduced as compared with the first embodiment described above, the stability of the lead portions 26A and 26B can be further increased. . For example, if the lead wires 24A and 24B and the outer peripheral surface of the circulating portion 22 are fixed using a conductive wire having a fusion layer, the stability of the positions of the lead portions 26A and 26B can be further increased. Thereby, the area of the magnetic body 12 outside the winding portion 22 can be further reduced, and a thin conducting wire can be used. For example, when the dimensional ratio is such that the length (L) × width (W) of the magnetic body 12 is 2.0 × 1.6 (mm) (see the example in FIG. 4C), the lead-out portion 26A, 26B is a position that hangs on the diagonal lines DA and DB. In the case of L × W = 2.0 × 1.2 size (see FIG. 4D), the lead-out portions 26A and 26B are shorter than the diagonal lines DA and DB. It comes within the side areas ES1 and ES2.

  As a result, the positions of the lead portions 26A and 26B can be farthest from the side surface of the magnetic body (see the interval IB in FIG. 4C), which is a preferable position for securing the thickness of the magnetic body 12. And the thickness of a magnetic body can be made thin by preventing a crack etc. from being triggered by the circumference | surroundings of drawer part 26A, 26B. The positions of the lead-out portions 26A and 26B based on the L × W size ratio similarly apply to the first embodiment. Further, in this embodiment, there is an advantage that the area on the inner peripheral side of the rotating portion 22 can be further increased than in the first embodiment. Other basic effects are the same as those of the first embodiment.

  <Specific Example> Next, using the specific example and comparative example of the present invention, the arrangement of the lead-out portions 26A and 26B when the coil shaft 29 has a shape having a long axis LA and a short axis LB The area balance of the magnetic body 12 will be described below. FIG. 5 shows a specific example of the coil component 10. The length of the mounting surface of the product (coil component 10) is L, the width is W, the length of the short axis on the outer periphery of the rotating portion 20 is X1, the length of the long axis is Y1, and the inner circumference of the rotating portion 22 is The length of the short axis is X2, and the length of the long axis is Y2. Moreover, the area of the outer side of the circumference part 22 is S1, the area of the circumference part 22 is S2, and the area of the inner side of the circumference part 22 is S3. Parts were made.

  In FIG. 6, the “side drawer” of the “drawer” means that the drawers 26 </ b> A and 26 </ b> B are drawn from the side surface adjacent to the short side of the surface mounted on the substrate of the magnetic body 12. “Example 1” and “Example 2” indicate that an air-core coil was formed by the manufacturing method of Example 1 and Example 2 described above. Specific example 1 corresponds to the inner peripheral shape of air core coil 50A in FIG. 4A being an ellipse, and specific example 5 is the inner periphery of air core coil 50B in FIG. 4B. This corresponds to an elliptical shape. Further, the specific example 3 corresponds to a case where the inner peripheral shape of the air core coil 50C in FIG. 4 (C) is an oval shape, and the specific example 7 is the inner peripheral shape of the air core coil 50D in FIG. 4 (D). Specific examples 4 and 8 correspond to the rectangular shape (rounded rectangle) of the air-core coil 50E of FIG. In the specific examples 4 and 8, the iron core 40 having a rectangular cross-sectional shape is prepared, and the air-core coil 50E is created after rounding R0.1 mm at four corners. For this reason, it has a rounded rectangular shape with a rounded R. As a result, the air-core coil 50E is obtained without damaging the conductive film.

  As product sizes, two types of 2.0 × 1.6 × 1.0 mm and 2.0 × 1.25 × 1.0 mm were used, and the height of the magnetic body 12 was 0.9 mm in both cases. Further, each corner of the magnetic body 12 was rounded with R0.1 mm. And the composite magnetic material used what mixed 95 wt% of FeSiCrB as a metal particle, and 5 wt% of epoxy resins as resin. The air-core coil 20 uses a rectangular wire with a coating having cross-sectional dimensions of 0.25 × 0.05 mm and 0.25 × 0.035 mm (both have a fusion layer). 11 turns. Further, as the terminal electrodes 14 and 16, after forming a Ti / Ag layer by sputtering, the conductive paste is stacked, cured at a temperature of 200 ° C., and finally plated with Ni / Sn. It was made to be 0.02 mm and connected to the end portions 28A and 28B of the lead portions 26A and 26B, respectively.

  Evaluations of Comparative Examples 1 to 4 and Specific Examples 1 to 8 formed as described above were performed from the surface on the mounting side. Specifically, the lead-out portions 26A and 26B are formed on the surface of the magnetic body 12 from which the terminal electrodes 14 and 16 are removed at a magnification of 50 times with a scanning electron microscope (SEM). The diagonals were connected by straight lines each having a width corresponding to 10 μm, and divided into four areas by the straight lines (diagonal lines DA and DB), and the locations of the lead-out portions 26A and 26B were evaluated. Regarding how to draw a straight line (diagonal lines DA, DB), if the corners of the magnetic body 12 are rounded as described above, the long side and the short side of the magnetic body are extended to determine the points where they intersect. This point was done by reviewing the corners of the magnetic material and connecting the corners of the opposing positions. Further, polishing was performed to the half of the height of the magnetic body 12 in the same direction as described above, and each area of the polished surface was obtained by converting the area by image processing. Here, “S3 / S1”, which is the ratio of the area S3 inside the winding part and the area S1 outside the winding part, can be 0.38 or more. As a result, the area S1 of the outer periphery can be made 1.3 to 1.8 times that of the conventional one, and the magnetic path cross-sectional area can be increased to facilitate the inductance, resulting in an inductance of 2 μH or less. In this case, the current characteristic can be designed to be 1.5 to 2.2 times. In addition, about said magnification, magnification may be changed so that the sample to evaluate may be settled in one image, and the same evaluation is attained by setting it as the range of 35-100 times.

The following can be confirmed from the results of FIG.
a. From the results of Comparative Example 1 and Comparative Example 2, in the case of side drawer, the effect of improving the area ratio S3 / S1 is not seen even if the circular portion 22 is rectangular (rounded rectangle).
b. From the results of Comparative Example 3 and Comparative Example 4, the area ratio S3 / S1 was increased by making the revolving part 22 rectangular even in the case of side drawer, but the area balance was not achieved. .
c. In the specific example 1 and the specific example 5, the effect of making an ellipse is seen, and compared with the comparative example 1 and the comparative example 3, the area ratio S3 / S1 is changed from 0.21, 0.13 to 0.38, 0.43. We were able to.
d. Compared to Specific Example 1 and Specific Example 5 in which the production procedures are different from those of Specific Example 2 and Specific Example 6, the effect of bringing the lead-out portions 26A and 26B closer to the rotating portion 22 is seen, and the area ratio S3 / S1 could be 0.41 and 0.46.
e. Specific examples 3, 4, 7, and 8 are examples in which the revolving part 22 is formed in an oval shape (oval shape) and a rounded rectangle shape, but both are effective and the area ratio can be further increased.
f. If the long axis / short axis (Y2 / X2) is larger than the long side / short side (L / W), the size of the magnetic body 12 is utilized, and the thickness of the magnetic body outside the winding portion 22 is set to the long side. And the short side can be made substantially the same thickness, the number of places where the magnetic flux concentrates can be reduced, and the electrical performance such as inductance and saturation current can be improved and the magnetic flux leakage can be reduced.

In addition, this invention is not limited to the Example mentioned above, A various change can be added in the range which does not deviate from the summary of this invention. For example, the following are also included.
(1) The shapes, dimensions, and materials shown in the above embodiments are examples, and may be changed as appropriate.
(2) In the above-described embodiment, the terminal electrodes 14 and 16 are provided on the surface side on which the coil component 10 is mounted. However, this is also an example, and can be appropriately changed as necessary.
(3) The dimensions shown in the specific examples are also examples, and the design can be changed as appropriate within a range where the same effects can be obtained. Moreover, the number of turns of the winding part of the air-core coil is also an example, and may be appropriately increased or decreased as necessary.
(4) In the above embodiment, the inner peripheral shape of the air-core coil 20 is an oval (oval type) or a rounded rectangular shape, but this is also an example, and the design can be changed as appropriate within the range where the same effect can be obtained. is there.
(5) In the above embodiment, the case where a flat wire is used as the conducting wire has been described as an example, but the conducting wire used in the present invention may be a round wire. In addition, when the cross section of the conductor is 0.01 mm ² or more, it is convenient because the forming shape of the present invention can be stably formed.

  As described above, the coil component of the present invention has a rectangular parallelepiped magnetic body formed of metal magnetic particles and a resin, a circular portion embedded in the magnetic body, and a long side and a short side on the side mounted on the substrate. When the surface of the magnetic body is divided into four areas by two diagonal lines, it is included in each of the two areas on the short side of the four areas, and from both ends of the rotating portion, An air-core coil having a pair of lead portions that are led out to the outside, and a pair of terminal electrodes that are electrically connected to the lead portion. For this reason, a pair of drawer | drawing-out part is arrange | positioned near the short side of a magnetic body, and space saving of an extraction | drawer part is attained. Thereby, the ratio which the magnetic body of the outer side of an air core coil accounts can be made small, and a useless magnetic body can be decreased. As a result, current characteristics can be improved. In addition, the polishing of the extraction portion is easy, and the stability of the extraction position can be increased. For this reason, it can apply to the use of a coil component. In particular, since the position of the lead portion is stabilized, connection stability with the terminal electrode can be obtained, which is suitable for the use of a small and high performance coil component.

10, 10A to 10E: Coil parts 12: Magnetic bodies 12A, 12B: Long sides 12C, 12D: Short sides 14, 16: Terminal electrodes 20, 20A, 20B: Air core coils 22, 22A, 22B: Circumferential portions 23A, 23B : Intersections 24A, 24B: Lead wires 26A, 26B: Lead portions 28A, 28B: End 29: Coil shaft 30: Rectangular wire 30A, 30B: Short sides 30C, 30D: Long sides 40: Iron cores 50A-50E: Empty Core coils ES1, ES2, EL1, EL2: Area DA, DB: Diagonal line LA: Long axis LB: Short axis

Claims (7)

A rectangular parallelepiped magnetic body formed of metal magnetic particles and resin;
When the surface of the magnetic body on the side to be mounted on the substrate is divided into four areas by two diagonal lines, the surrounding area embedded in the magnetic body, the long side and the short side, and the four areas Air core coils having a pair of lead portions that are respectively included in two areas on the short side and are drawn to the outside of the magnetic body from both ends of the rotating portion,
A pair of terminal electrodes electrically connected to the lead portion;
A coil component comprising:   2. The coil component according to claim 1, wherein when viewed from the surface of the magnetic body mounted on the substrate, the pair of lead portions are located in contact with the outer peripheral surface of the rotating portion.   3. The coil component according to claim 1, wherein an inner peripheral shape of the rotating portion viewed from a surface of the magnetic body mounted on the substrate is an oval or a rounded rectangle.   The coil component according to any one of claims 1 to 3, wherein the pair of terminal electrodes are formed on a surface of a magnetic body mounted on the substrate.   An electronic apparatus comprising the coil component according to claim 1. A conductive wire is wound to form a circular portion, and each conductive wire drawn from both ends of the circular portion has an intersecting portion as viewed from the coil axis direction formed by the circular portion, and from the outer peripheral surface of the circular portion A pair of wires are drawn out in a direction away from each other, and are further bent toward the ends of the conductive wires so as to form predetermined gaps between the outer peripheral surface of the winding portion and in opposite directions to be parallel to each other. A first step of forming a leader line;
A second step of bending a pair of lead lines and forming a pair of lead portions parallel to the coil axis and facing in the same direction;
A third step of bending the intersection of the pair of leader lines along the outer peripheral surface of the circulating portion;
A fourth step of bending the pair of lead portions so as to approach the loop portion while maintaining the pair of lead portions parallel to the coil axis;
While monitoring the position of the surrounding portion and the pair of lead portions, the air core coil formed in the first to fourth steps is set in the mold, and the magnetic material is embedded by embedding a magnetic material made of metal particles and resin. A fifth step of molding;
The manufacturing method of the coil components characterized by including this. A conductive wire is wound to form a circular portion, and each conductive wire drawn from both ends of the circular portion has an intersecting portion as viewed from the coil axis direction formed by the circular portion, and from the outer peripheral surface of the circular portion A pair of wires are drawn out in a direction away from each other, and are further bent toward the ends of the conductive wires so as to form predetermined gaps between the outer peripheral surface of the winding portion and in opposite directions to be parallel to each other. A first step of forming a leader line;
A second step of bending a pair of lead lines and forming a pair of lead portions parallel to the coil axis and facing in the same direction;
A third step of bending the pair of lead portions so as to approach the loop portion while maintaining the pair of lead portions parallel to the coil axis;
A fourth step of bending the intersection of the pair of leader lines along the outer peripheral surface of the rotating portion;
While monitoring the position of the surrounding portion and the pair of lead portions, the air core coil formed in the first to fourth steps is set in the mold, and the magnetic material is embedded by embedding a magnetic material made of metal particles and resin. A fifth step of molding;
The manufacturing method of the coil components characterized by including this.

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