Magnetic component

Abstract

To provide a magnetic component in which the influence of eddy current loss due to a leakage flux generated from a gap 18 can be reduced.SOLUTION: A magnetic component 1 includes a coil 10, a core 14, and a bobbin 26. The coil 10 is formed by winding a conductive member once or less. The core 14 includes a gap 18 that separates an end part 141d' of an intermediate part 141d of a first core part 141 and an end part 142d' of an intermediate part 142d of a second core part and not having a magnetic path formed at a central part of the core 16. The bobbin includes a coil positioning part 22 that positions the coil so that the distance between the gap and the coil becomes a predetermined size, and a core positioning part that positions the core so that the distance between a lowermost surface of the core and a lowermost surface 26a of the bobbin becomes a predetermined size. The bobbin lowermost surface exists lower than the core lowermost surface. The bobbin is provided so that the bobbin lowermost surface is placed on an upper surface of an external substrate.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a magnetic component using a bobbin, comprising a coil, a core, and a bobbin. [Background Technology]

[0002] When forming a one-turn coil, which is a magnetic component, a one-turn through-type core shape is often used, in which a wire is passed through a center hole of a toroidal type or UU (UI) type.When forming a one-turn coil, a one-turn through-type core shape is often used, in which a wire is passed through a center hole of a toroidal type or UU (UI) type.

[0003] Patent Document 1 discloses an inductor having a dust core and a coil. The dust core has at least one through hole. Each through hole penetrates the dust core in the vertical direction and has an inner peripheral surface in a horizontal plane perpendicular to the vertical direction. The dust core has an outer peripheral surface in the horizontal plane. The coil is partially located inside each through hole and is wound so as not to cover the outer periphery. The outer periphery has a shape without corners in the horizontal plane. Each inner peripheral surface has a shape without corners in the horizontal plane.

[0004] Patent Document 2 discloses a coil having a low-cost and easy-to-manufacture structure in which a bus bar is inserted into a core and fixed with a strip-shaped member to realize a one-turn through shape. The coil includes a core with two through holes, a U-shaped busbar with opposing plate-like parts, a bobbin that insulates the core and the busbar, the busbar with its plate-like part inserted into the through hole, and a tape that fixes the bobbin and the core. Furthermore, the busbar is a U-shaped member formed by flatwise bending a metal plate.

[0005] Patent Document 3 discloses a transformer in which single-turn coils are laminated. A primary coil formed by laminating substantially U-shaped single-turn coils punched out from a copper plate is inserted into a frame-shaped box case made of an insulating resin, and the frame-shaped box cases are mated. The other primary coil is also incorporated into cases in the same manner as the said primary coil, and with a secondary coil having a punched-out substantially U-shaped single-turn coil sandwiched therebetween, it serves as the coil portion of the transformer, and an E-shaped core made of ferrite is incorporated to form a high-current transformer.

[0006] Patent Document 4 discloses a high-voltage transformer that achieves miniaturization. In a high-voltage transformer comprising a core, a bobbin having a hollow hole that can be attached to the core, and a coil wound around the bobbin, flanges are provided at both ends of the bobbin. One of the flanges has a primary-side coil constituted by a single-turn coil made of a U-shaped conductor, and one terminal of the secondary-side coil wound in a single-layer aligned winding between the flanges at both ends of the bobbin is wired to the secondary terminal through between the terminals of the primary-side coil.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0008] When forming a one-turn coil, which is a magnetic component, like a resonant choke coil, due to core loss suppression, a ferrite core is used for the core material and a large GAP is provided. When applying it to a choke coil with characteristics such as a strict L-value tolerance, large leakage magnetic flux, and non-negligible eddy current loss, the following problems exist in the toroidal type or UU (UI) type.

[0009] That is, since insulation is required between the core and the wire, a bobbin or a case is used. However, if there is nothing to fix and support the wire, it has to be wound along while contacting the core center. Then, due to the magnetic flux leaking from the GAP provided in the core center, a large eddy current loss is generated in the wire, causing heat generation.

[0010] This becomes a problem with a conventional general-purpose bobbin for transformers. Also, if the wire is just in contact with the bobbin and wound along, the position of the wire is not fixed and moves. Therefore, in order to fix it at a predetermined position during mounting, it is necessary to fix it with tape or the like. There is also a problem that for the lead-out part for mounting on the substrate, a fixing base or the like needs to be provided, resulting in extra cost for fixing members and man-hours. In addition, in the case of a resonant coil or a coil used in a high-voltage circuit, a creepage distance from the core is often required.

[0011] With a conventional general-purpose bobbin for transformers, the structure does not ensure a reliable distance from the outer leg core, and it has a structure that easily moves and touches, resulting in a problem of insulation breakdown.

[0012] For countermeasures, it was necessary to use triple-insulated wire for the wire, perform processes such as winding insulating tape or tubes, or provide another resin case such as a core protection case.

[0013] An object of the present invention is to provide a magnetic component that solves the above problems.

Means for Solving the Problems

[0014] The magnetic component (1) according to the present invention includes a coil (10), a core (14), and a bobbin (16). The coil (10) is formed of a conductive member with a winding number of 1 or less. The core (14) has a gap (18) in which a magnetic path is not formed in part. The bobbin (26) has a coil positioning portion (22) for positioning the coil (10) so that the distance between the gap (18) and the coil (10) becomes a predetermined dimension, and a core positioning portion (26c) for positioning the core (14) so that the distance between the lowermost surface (14a) of the core (14) and the lowermost surface (26a) of the bobbin becomes a predetermined dimension. The lowermost surface (26a) of the bobbin is positioned below the lowermost surface (14a) of the core, and the bobbin (26) is provided such that the lowermost surface (26a) of the bobbin is placed on the upper surface (100a) of the external substrate (100).

[0015] According to the present invention, the bobbin (26) has a coil positioning portion (22) for positioning the coil (10) so that the distance between the gap (18) and the coil (10) becomes a predetermined dimension, and a core positioning portion (26c) for positioning the core (14) so that the distance between the lowermost surface (14a) of the core (14) and the lowermost surface (26a) of the bobbin becomes a predetermined dimension. The lowermost surface (26a) of the bobbin is positioned below the lowermost surface (14a) of the core, and the bobbin (16) is provided such that the lowermost surface (26a) of the bobbin is placed on the upper surface (100a) of the external substrate (100). Thus, the coil (10) and the core (14) can be positioned via the bobbin (26), and the gap (18), the coil (10), and the upper surface (100a) of the external substrate (100) can be separated by a predetermined distance, and the influence of eddy current loss due to leakage magnetic flux generated from the gap (18) can be reduced.

[0016] The coil positioning portion (22) is formed as a recess (22a) into which a part of the coil (10) is inserted at the central portion (26b´) of the upper end (26b) of the bobbin (26). The lower end portion (10a) of the coil (10) is formed as a terminal portion (10a´) for insertion into the through-hole (110) of the external substrate (100). By inserting a part of the coil (10) into the recess (22a) and positioning it at the central portion (26b´) of the upper end (26b) of the bobbin (26), and exposing the terminal portion (10a´) downward from the lowermost surface (26a) of the bobbin and inserting it into the through-hole (110) of the external substrate (100), the coil (10) can be provided on the external substrate (100) while being positioned at the central portion (26b´) of the upper end (26b) of the bobbin (26).

[0017] The coil (10) is formed in a flat plate shape and a U shape with a predetermined width dimension. Both lower end portions (10a) of the U shape are inserted into the through-holes (110) of the external substrate (100) as terminal portions (10a´), and the intermediate portion (10b) of the U shape is positioned so as to be fitted into the coil positioning portion (22) of the bobbin (26). Thus, the coil (10) can be provided on the external substrate (100) while being positioned via the bobbin (16).

[0018] The core (14) has a first core portion (141) and a second core portion (142). When viewed from above, the first core portion (141) and the second core portion (141) are formed in an E shape, and include a base portion (141a, 142a), a first side portion (141b, 142b) extending from one end of the base portion (141a, 142a), a second side portion (141c, 142c) extending from the other end of the base portion (141a, 142a), and an intermediate portion (141d, 142d) extending from the middle of the base portion (141a, 142a) so as to be parallel to the first side portion (141b, 142b) and the second side portion (141c, 142c). At least one of the intermediate portions (141d, 142d) in the first core portion (141) and the second core portion (142) is set to be shorter in length than the first side portion (141b, 142b) and / or the second side portion (141c, 142c). When the first core portion (141) and the second core portion (142) are opposed to each other, the end portion (141b´) of the first side portion (141b) of the first core portion (141) and the end portion (142b´) of the first side portion (142b) of the second core portion (142) are abutted against each other, and the end portion (141c´) of the second side portion (141c) of the first core portion (141) and the end portion (142c´) of the second side portion (142c) of the second core portion (142) are abutted against each other. When this is done, a gap (18) can be formed in the central portion of the core (14) by the separation between the end portion (141d´) of the intermediate portion (141d) of the first core portion (141) and the end portion (142d´) of the intermediate portion (142d) of the second core portion (142).

[0019] The bobbin (26) has a plate-shaped first side portion (261), a second side portion (262), a bottom portion (263), a first support portion (265), and a second support portion (266). The first side portion (261) and the second side portion (262) are provided so as to extend upward from the side end (263a´) of the bottom portion (263) and be parallel to each other. The first support portion (265) and the second support portion (266) are provided so as to stand on the upper surface (263a) of the bottom portion (263) and be parallel to each other between the first side portion (261) and the second side portion (262), and further be parallel to the first side portion (261) and the second side portion (262). A coil positioning portion (22) formed as a recess (22a) is provided at the upper ends (265´, 266´) of the first support portion (265) and the second support portion (266). The bottom portion (263) is provided with a first bottom hole (263b) between the first side portion (261) and the first support portion (265), and a second bottom hole (263c) between the second side portion (262) and the second support portion (266). Further, the bottom portion (263) has a leg portion (263f) extending downward from the lower surface (263e) of the bottom portion (263), and the lowermost surface of the leg portion (263f) can be the lowest surface (26a) of the bobbin.

[0020] That is, on the upper surface (263a) side of the bottom (263) of the bobbin (26), the first side portion (141b) of the first core portion (141) and the first side portion (142b) of the second core portion (142) are inserted between the first side portion (261) and the first support portion (265) of the bobbin (26) so as to face each other, and the second side portion (141c) of the first core portion (141) and the first side portion (142c) of the second core portion (142) are inserted between the second side portion (262) and the second support portion (266) of the bobbin (26) so as to face each other. Further, the intermediate portion (141d) of the first core portion (141) and the intermediate portion (142d) of the second core portion (142) are inserted between the first support portion (265) and the second support portion (266) of the bobbin (26) so as to face each other. The end portion (141b') of the first side portion (141b) of the first core portion (141) and the end portion (142b') of the first side portion (142b) of the second core portion (142) are butted against each other, and the end portion (141c') of the second side portion (141c) of the first core portion (141) and the end portion (142c') of the second side portion (142c) of the second core portion (142) are butted against each other. Furthermore, a gap (18) is formed at the central portion of the core (16) by separating the space between the end portion (141d') of the intermediate portion (141d) of the first core portion (141) and the end portion (142d') of the intermediate portion (142d) of the second core portion (142). The core (14) is assembled to the bobbin (26) so that the lowermost surface (14a) of the core (14) is placed on the bottom (163), whereby the core (14) can be positioned via the bobbin (26).

[0021] While fitting and positioning the U-shaped intermediate portion (10b) of the coil (10) into the coil positioning portion (22) of the bobbin (26), the terminal portion (10a') of the coil (10) is inserted into the first bottom hole (263b) of the bobbin (26) and also inserted into the second bottom hole (263c) of the bobbin (26). Further, the terminal portion (10a') of the coil (10) is inserted into the through hole (110) of the external substrate (100) so as to be exposed downward from the lowermost surface (26a) of the bobbin (26). By assembling the coil (10) to the bobbin (26), the coil (10) can be positioned via the bobbin (26) and provided on the external substrate (100).

Advantages of the Invention

[0022] According to the present invention, the coil 10 and the core 14 can be positioned via the bobbin 16, and the gap 18, the coil 10, and the upper surface 100a of the external substrate 100 can be separated by a predetermined distance, and the influence of eddy current loss due to leakage magnetic flux generated from the gap 18 can be reduced.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiments for Carrying Out the Invention

[0024] Hereinafter, an example of an embodiment will be described. Note that the present invention is not limited to the embodiments described below, and can be appropriately modified without changing the gist of the invention.

[0025] Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing the configuration of a magnetic component according to an embodiment of the present invention, FIG. 2 is a view showing the configuration of the magnetic component, FIG. 3 is a view showing the configuration of the core in the magnetic component, FIGS. 4 and 5 are views showing the configuration of the bobbin in the magnetic component, FIG. 6 is a front view for explaining the assembly method of the magnetic component, FIG. 7 is a plan view following FIG. 6 for explaining the assembly method of the magnetic component, FIG. 8 is a plan view following FIG. 7 for explaining the assembly method of the magnetic component, FIG. 9 is a plan view following FIG. 8 for explaining the assembly method of the magnetic component, FIG. 10 is a front view following FIGS. 8 and 9 for explaining the assembly method of the magnetic component, and FIG. 11 is a front view following FIGS. 8 and 9 for explaining the assembly method of the magnetic component.

[0026] As shown in FIGS. 1 to 5, a magnetic component 1 according to an embodiment of the present invention includes a coil 10, a core 14, and a bobbin 26. The coil 10 is formed of a conductive member wound one or fewer times. The core 14 has a gap 18 in which a magnetic path is not formed in part. The bobbin 26 has a coil positioning portion 22 that positions the coil 10 so that the distance between the gap 18 and the coil 10 becomes a predetermined dimension, and a core positioning portion 26c that positions the core 14 so that the distance between the lowermost surface 14a of the core 14 and the lowermost surface 26a of the bobbin 26 becomes a predetermined dimension. The bobbin lowermost surface 26a is located below the core lowermost surface 14a, and the bobbin 26 is provided such that the bobbin lowermost surface 26a is placed on the upper surface 100a of the external substrate 100.

[0027] The coil positioning portion 22 is formed as a recess 22a into which a part of the coil 10 is inserted at the central portion 26b' of the upper end 26b of the bobbin 26. The lower end portion 10a of the coil 10 is formed as a terminal portion 10a' for insertion into the through hole 110 of the external substrate 100. A part of the coil 10 is inserted into the recess 22a and positioned at the central portion 26b' of the upper end 26b of the bobbin 26. At the same time, the terminal portion 10a' is exposed downward from the lowermost surface 26a of the bobbin and inserted into the through hole 110 of the external substrate 100, so that the coil 10, the gap 18, and the external substrate 100 are positioned. The terminal portion 10a' is connected and fixed to the through hole 110 of the external substrate 100 with solder or the like. The through hole 110 is a through hole provided in the external substrate 100.

[0028] When viewed from above, the gap 18 and the coil 10 of the magnetic component 1 are arranged at overlapping positions.

[0029] The coil 10 is formed in a flat plate shape and a U shape with a predetermined width dimension. Both lower end portions 10a of the U shape are inserted into the through holes 110 of the external substrate 100 as terminal portions 10a', and the intermediate portion 10b of the U shape is positioned so as to be fitted into the coil positioning portion 22 of the bobbin 26.

[0030] The coil 10 is formed of copper. The core 14 has a first core portion 141 and a second core portion 142. When viewed from above, the first core portion 141 and the second core portion 142 are formed in an E shape, and have a base portion 141a, 142a, a first side portion 141b, 142b extending from one end of the base portion 141a, 142a, a second side portion 141c, 142c extending from the other end of the base portion 141a, 142a, and an intermediate portion 141d, 142d extending from the middle of the base portion 141a, 142a so as to be parallel to the first side portion 141b, 142b and the second side portion 141c, 142c. At least one of the intermediate portions 141d, 142d in the first core portion 141 and the second core portion 142 is set to be shorter in length than the first side portion 141b, 142b and / or the second side portion 141c, 142c. When the first core portion 141 and the second core portion 142 are opposed to each other and the end portion 141b´ of the first side portion 141b of the first core portion 141 is abutted against the end portion 142b´ of the first side portion 142b of the second core portion 142, and the end portion 141c´ of the second side portion 141c of the first core portion 141 is abutted against the end portion 142c´ of the second side portion 142c of the second core portion 142, a gap is formed between the end portion 141d´ of the intermediate portion 141d of the first core portion 141 and the end portion 142d´ of the intermediate portion 142d of the second core portion 142. This separated portion becomes the gap 18.

[0031] The bobbin 26 has a plate-shaped first side portion 261, a second side portion 262, a bottom portion 263, a first support portion 265, and a second support portion 266. The first side portion 261 and the second side portion 262 are provided so as to extend upward from the side end 263a' of the bottom portion 263 and be parallel to each other. The first support portion 265 and the second support portion 266 are provided so as to stand on the upper surface 263a of the bottom portion 263 and be parallel to each other between the first side portion 261 and the second side portion 262, and further be parallel to the first side portion 261 and the second side portion 262. Coil positioning portions 22 formed as recesses 22a are provided at the upper ends 265', 266' of the first support portion 265 and the second support portion 266. The bottom portion 263 is provided with a first bottom hole 263b between the first side portion 261 and the first support portion 265 and a second bottom hole 263c between the second side portion 262 and the second support portion 266. Further, the bottom portion 263 has legs 263f extending downward from the lower surface 263e of the bottom portion 263, and the lowermost surface of the legs 263f is the bobbin lowermost surface 26a. The upper surface 263a of the bottom portion 263 of the bobbin 26 functions as a core positioning portion 26c for positioning the core 14.

[0032] The magnetic component 1 having the bobbin 26 configured as described above can be assembled as shown in FIGS. 6 to 11.

[0033] That is, as shown in FIG. 6, the bobbin 26 is provided such that the bobbin lowermost surface 26a is placed on the upper surface 100a of the external substrate 100.

[0034] Next, as shown in FIGS. 7 to 9, on the upper surface 263a side of the bottom 263 of the bobbin 26, the first side portion 141b of the first core portion 141 and the first side portion 142b of the second core portion 142 are inserted between the first side portion 261 and the first support portion 265 of the bobbin 26 so as to face each other, and the second side portion 141c of the first core portion 141 and the first side portion 142c of the second core portion 142 are inserted between the second side portion 262 and the second support portion 266 of the bobbin 26 so as to face each other. Also, the intermediate portion 141d of the first core portion 141 and the intermediate portion 142d of the second core portion 142 are inserted between the first support portion 265 and the second support portion 266 of the bobbin 26 so as to face each other. The end portion 141b' of the first side portion 141b of the first core portion 141 and the end portion 142b' of the first side portion 142b of the second core portion 142 are butted against each other, and the end portion 141c' of the second side portion 141c of the first core portion 141 and the end portion 142c' of the second side portion 142c of the second core portion 142 are butted against each other. Further, a gap 18 is formed in the central portion of the core 14 by separating the space between the end portion 141d' of the intermediate portion 141d of the first core portion 141 and the end portion 142d' of the intermediate portion 142d of the second core portion 142. The core 14 is assembled to the bobbin 26 such that the lowermost surface 14a of the core 14 is placed on the bottom 163.

[0035] Subsequently, as shown in FIGS. 10 and 11, while fitting and positioning the U-shaped intermediate portion 10b of the coil 10 into the coil positioning portion 22 of the bobbin 26, the terminal portion 10a' of the coil 10 is inserted into the first bottom hole 263b of the bobbin 26 and also into the second bottom hole 263c of the bobbin 26. Further, the terminal portion 10a' of the coil 10 is inserted into the through hole 110 of the external substrate 100 so as to be exposed downward from the lowermost surface 26a of the bobbin 26, and the coil 10 is assembled to the bobbin 26. The terminal portion 10a' of the coil 10 is connected and fixed to the through hole 110 of the external substrate 100 with solder or the like.

[0036] As described above, according to the present embodiment, the bobbin 26 has a coil positioning portion 22 that positions the coil 10 such that the distance between the gap 18 and the coil 10 becomes a predetermined dimension, and a core positioning portion 26c that positions the core 14 such that the distance between the lowermost surface 14a of the core 14 and the lowermost surface 26a of the bobbin becomes a predetermined dimension. The lowermost surface 26a of the bobbin is located below the lowermost surface 14a of the core, and since the bobbin 26 is provided such that the lowermost surface 26a of the bobbin is placed on the upper surface 100a of the external substrate 100, the coil 10 and the core 14 are positioned via the bobbin 26, and the gap 18, the coil 10, and the upper surface 100a of the external substrate 100 can be separated by a predetermined distance, and the influence of eddy current loss due to leakage magnetic flux generated from the gap 18 can be reduced.

[0037] Further, according to the present embodiment, the coil positioning portion 22 is formed as a recess 22a into which a part of the coil 10 is inserted at the central portion 26b' of the upper end 26b of the bobbin 26. The lower end portion 10a of the coil 10 is formed as a terminal portion 10a' for insertion into the through hole 110 of the external substrate 100. A part of the coil 10 is inserted into the recess 22a and positioned at the central portion 26b' of the upper end 26b of the bobbin 26, and the terminal portion 10a' is exposed downward from the lowermost surface 26a of the bobbin and inserted into the through hole 110 of the external substrate 100, so that the coil 10 can be provided on the external substrate 100 while being positioned at the central portion 26b' of the upper end 26b of the bobbin 26.

[0038] Furthermore, according to the present embodiment, the coil 10 is formed in a flat plate shape and a U shape with a predetermined width dimension. Both lower end portions 10a of the U shape are inserted into the through holes 110 of the external substrate 100 as terminal portions 10a', and the intermediate portion 10b of the U shape is positioned to be fitted into the coil positioning portion 22 of the bobbin 26, so that the coil 10 can be provided on the external substrate 100 while being positioned via the bobbin 26.

[0039] Furthermore, according to the present embodiment, the core 14 has a first core portion 141 and a second core portion 142. When viewed from above, the first core portion 141 and the second core portion 141 are formed in an E shape, and include base portions 141a, 142a, first side portions 141b, 142b extending from one end of the base portions 141a, 142a, second side portions 141c, 142c extending from the other end of the base portions 141a, 142a, and intermediate portions 141d, 142d extending from the middle of the base portions 141a, 142a so as to be parallel to the first side portions 141b, 142b and the second side portions 141c, 142c. At least one of the intermediate portions 141d, 142d in the first core portion 141 and the second core portion 142 is set to have a length shorter than that of the first side portions 141b, 142b and / or the second side portions 141c, 142c. When the first core portion 141 and the second core portion 142 are opposed to each other and the end portion 141b' of the first side portion 141b of the first core portion 141 is abutted against the end portion 142b) of the first side portion 142b of the second core portion 142, and the end portion 141c' of the second side portion 141c of the first core portion 141 is abutted against the end portion 142c' of the second side portion 142c of the second core portion 142, a gap 18 can be formed at the central portion of the core 14 by the separation between the end portion 141d' of the intermediate portion 141d of the first core portion 141 and the end portion 142d' of the intermediate portion 142d of the second core portion 142. Furthermore, according to the present embodiment, on the upper surface 263a side of the bottom 263 of the bobbin 26, the first side portion 141b of the first core portion 141 and the first side portion 142b of the second core portion 142 are inserted between the first side portion 261 and the first support portion 265 of the bobbin 26 so as to face each other, and the second side portion 141c of the first core portion 141 and the first side portion 142c of the second core portion 142 are inserted between the second side portion 262 and the second support portion 266 of the bobbin 26 so as to face each other. Also, the intermediate portion 141d of the first core portion 141 and the intermediate portion 142d of the second core portion 142 are inserted between the first support portion 265 and the second support portion 266 of the bobbin 26 so as to face each other. The end portion 141b' of the first side portion 141b of the first core portion 141 and the end portion 142b' of the first side portion 142b of the second core portion 142 are butted against each other, and the end portion 141c' of the second side portion 141c of the first core portion 141 and the end portion 142c' of the second side portion 142c of the second core portion 142 are butted against each other. Further, a gap 18 is formed in the central portion of the core 16 by separating the space between the end portion 141d' of the intermediate portion 141d of the first core portion 141 and the end portion 142d' of the intermediate portion 142d of the second core portion 142. By assembling the core 14 to the bobbin 26 so that the lowermost surface 14a of the core 14 is placed on the bottom 163, the core 14 can be positioned via the bobbin 26.

[0040] Also, according to the present second embodiment, while fitting and positioning the U-shaped intermediate portion 10b of the coil 10 into the coil positioning portion 22 of the bobbin 26, the terminal portion 10a' of the coil 10 is inserted into the first bottom hole 263b of the bobbin 26 and also into the second bottom hole 263c of the bobbin 26. Further, the terminal portion 10a' of the coil 10 is inserted into the through hole 110 of the external substrate 100 so as to be exposed downward from the lowermost surface 26a of the bobbin 26. By assembling the coil 10 to the bobbin 26, the coil 10 can be positioned via the bobbin 26 and provided on the external substrate 100. The terminal portion 10a' of the coil 10 is connected and fixed to the through hole 110 of the external substrate 100 with solder or the like. Furthermore, according to the second embodiment, the bobbin 26 has legs 263f extending downward from the lower surface 263e of the bottom portion 263, and the lowermost surface of the legs 263f is the bobbin lowermost surface 26a. The bobbin 26 is provided such that the bobbin lowermost surface 26a is placed on the upper surface 100a of the external substrate 100, so that the position of the core 14 in the height direction can be adjusted to avoid the influence of leakage magnetic flux to the external substrate 100 side.

Explanation of Signs

[0041] 1: Magnetic component 10: Coil 10a: Lower end portion 10a´: Terminal portion 10´: Body 12: Through hole 14: Core 14a: Lowermost surface 141: First core portion 141a: Base portion 141b: First side portion 141b´: End portion 141c: Second side portion 141c´: End portion 141d: Intermediate portion 141d´: End portion 142: Second core portion 142a: Base portion 142b: First side portion 142b´: End portion 142c: Second side portion 142c´: End portion 142d: Intermediate portion 142d´: End portion 18: Gap 22: Coil positioning portion 22a: Recessed portion 26: Bobbin 26a: Bobbin lowermost surface 26b: Upper end 26b´: Central portion 26c: Core positioning portion 261: First side portion 262: Second side portion 263: Bottom portion 263a: Upper surface 263b: First bottom hole 263c: Second bottom hole 263e: Lower surface 263f: Foot portion 263a´: Side end 265: First support portion 265´: Upper end 266: Second support portion 266´: Upper end 100: External substrate 100a: Upper surface 110: Through hole

Claims

1. The coil (10), the core (14), and the bobbin (26), The coil (10) is made of a conductive material with one or less turns, The core (14) has a gap (18) in a portion where no magnetic path is formed, the bobbin (16) has a coil positioning portion (22) that positions the coil (10) so that a distance between the gap (18) and the coil (10) is a predetermined dimension, and a core positioning portion (26c) that positions the core (14) so ​​that a distance between a lowermost surface (14a) of the core (14) and a lowermost surface (26a) of the bobbin (26) is a predetermined dimension; The bobbin (26) is provided such that the bottom surface (26a) of the bobbin is located below the bottom surface (14a) of the core, and the bottom surface (26a) of the bobbin is placed on the upper surface (100a) of an external substrate (100); A magnetic component (1).

2. The coil positioning portion (22) is formed as a recess (22a) into which a part of the coil (10) is inserted at a central portion (26b') of an upper end (26b) of the bobbin (26), A lower end portion (10a) of the coil (10) is formed as a terminal portion (10a') to be inserted into a through hole (110) of the external substrate (100), a portion of the coil (10) is inserted into the recess (22a) and positioned at the center (26b') of the upper end (26b) of the bobbin (26), and the terminal portion (10a') is exposed downward from the bottom surface (26a) of the bobbin and inserted into a through hole (110) of the external substrate (100), thereby positioning the coil (10), the gap (18), and the external substrate (100); 2. A magnetic component (1) according to claim 1, characterized in that

3. 2. The magnetic component (1) according to claim 1, characterized in that, when viewed from above, the gap (18) and the coil (10) are arranged in an overlapping position.

4. The magnetic component (1) described in claim 1, characterized in that the coil (10) is formed in a flat U-shape with a predetermined width dimension, both lower ends (10a) of the U-shape are inserted into a through hole (110) of the external substrate (100) as the terminal portion (10a'), and the U-shaped middle portion (10b) is positioned to be fitted into the coil positioning portion (22) of the bobbin (16).

5. 2. The magnetic component (1) according to claim 1, characterized in that the coil (10) is made of copper.

6. The core (14) has a first core portion (141) and a second core portion (142), The first core portion (141) and the second core portion (142) are formed in an E-shape when viewed from above, and include a base portion (141a, 142a), a first side portion (141b, 142b) extending from one end of the base portion (141a, 142a), a second side portion (141c, 142c) extending from the other end of the base portion (141a, 142a), and a second side portion (141b, 142b) extending from the other end of the base portion (141a, 142a). and an intermediate portion (141d, 142d) extending from the middle of the base portion (141a, 142a) so as to be parallel to the first side portion (141b, 142b) and the second side portion (141c, 142c), and at least one of the intermediate portions (141d, 142d) in the first core portion (141) and the second core portion (142) is The magnetic component (1) according to claim 1, characterized in that when the first core portion (141) and the second core portion (142) are opposed to each other and an end (141b') of the first side portion (141b) of the first core portion (141) is butted against an end (142b') of the first side portion (142b) of the second core portion (142), and an end (141c') of the second side portion (141c) of the first core portion (141) is butted against an end (142c') of the second side portion (142c) of the second core portion (142), there is a separation between the end (141d') of the intermediate portion (141d) of the first core portion (141) and the end (142d') of the intermediate portion (142d) of the second core portion (142).

7. The bobbin (26) has a plate-shaped first side portion (261), a second side portion (262), a bottom portion (263), a first support portion (265), and a second support portion (266), The first side portion (261) and the second side portion (262) are provided so as to extend upward from a side end (263a') of the bottom portion (263) and to be parallel to each other, the first support portion (265) and the second support portion (266) are provided between the first side portion (261) and the second side portion (262) so as to stand on an upper surface (263a) of the bottom portion (263) and to be parallel to each other and further to be parallel to the first side portion (261) and the second side portion (262); the coil positioning portion (22) formed as the recess (22a) is provided at upper ends (265', 266') of the first support portion (265) and the second support portion (266); The bottom portion (263) has a first bottom hole (263b) between the first side portion (261) and the first support portion (265), and a second bottom hole (263c) between the second side portion (262) and the second support portion (266), The magnetic component (1) of claim 1, further characterized in that the bottom portion (263) has a leg portion (263f) extending downward from a lower surface (263e) of the bottom portion (263), the lowest surface of the leg portion (263f) being the lowest surface (26a) of the bobbin.

8. On the upper surface (263a) side of the bottom portion (263) of the bobbin (26), the first side portion (141b) of the first core portion (141) and the first side portion (142b) of the second core portion (142) are inserted between the first side portion (261) of the bobbin (26) and the first support portion (265) so as to face each other, The second side portion (141c) of the first core portion (141) and the first side portion (142c) of the second core portion (142) are inserted between the second side portion (262) of the bobbin (26) and the second support portion (266) so as to face each other; and, The intermediate portion (141d) of the first core portion (141) and the intermediate portion (142d) of the second core portion (142) are inserted between the first support portion (265) and the second support portion (266) of the bobbin (26) so as to face each other; An end (141b') of the first side portion (141b) of the first core portion (141) and an end (142b') of the first side portion (142b) of the second core portion (142) are butted against each other, An end (141c') of the second side portion (141c) of the first core portion (141) and an end (142c') of the second side portion (142c) of the second core portion (142) are butted against each other, Furthermore, the end (141d') of the intermediate portion (141d) of the first core portion (141) and the end (142d') of the intermediate portion (142d) of the second core portion (142) are spaced apart to form the gap (18) in the center of the core (14); 2. The magnetic component (1) according to claim 1, characterized in that the core (14) is assembled to the bobbin (26) so that the lowermost surface (14a) of the core (14) rests on the bottom (163).

9. The magnetic component (1) according to claim 1, characterized in that the U-shaped intermediate portion (10b) of the coil (10) is fitted into the coil positioning portion (22) of the bobbin (26) to position it, while the terminal portion (10a') of the coil (10) is inserted into the first bottom hole (263b) of the bobbin (26) and into the second bottom hole (263c) of the bobbin (26), and further inserted into a through hole (110) of the external substrate (100) so that the terminal portion (10a') of the coil (10) is exposed downward from the bottom surface (26a) of the bobbin, thereby assembling the coil (10) to the bobbin (26).

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