Coil device

Abstract

To provide a coil device capable of controlling a resonance.SOLUTION: A coil device 1 includes: a bobbin 3 that includes a cylinder part 30 and a flange part 32a projected to an outside in a radial direction from an outer peripheral surface of the cylinder part 30 at one end in a shaft direction of the cylinder part 30; a wire 5 that is wound to the outer peripheral surface of the cylinder part 30; and a core 2a that is attached to the bobbin 3. The core 2a includes a base part 21, and an outer leg part 22m orthogonal to the base part 21. The bobbin 3 is adhered to the outer leg part 22m on the side of the outer peripheral surface of the cylinder part 30 while being adhered to the base part 21 on the side of an end surface 322a of the flange part 32a.SELECTED DRAWING: Figure 1B

Description

[Technical field]

[0001] The present invention relates to a coil device. [Background technology]

[0002] A known coil device used as a choke coil or a transformer is, for example, the coil device of Patent Document 1. The coil device of Patent Document 1 has a bobbin, a wire wound around the outer circumferential surface of the bobbin, and a core attached to the bobbin.

[0003] In this type of coil device, resonance may occur when current is applied. If resonance occurs at the operating frequency of the coil device, vibration of the coil device increases, which may cause a breakdown. Therefore, a technology to improve the resonance is required. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 7-29812 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a coil device capable of controlling resonance. [Means for solving the problem]

[0006] In order to achieve the above object, a coil device according to the present invention comprises: a bobbin having a cylindrical portion and a flange portion protruding radially outward from an outer circumferential surface of the cylindrical portion at one axial end of the cylindrical portion; A wire wound around an outer circumferential surface of the cylindrical portion; a core attached to the bobbin; The core has a base portion and an outer leg portion perpendicular to the base portion, The bobbin is bonded to the base portion on the end face side of the flange portion, and is bonded to the outer leg portion on the outer peripheral surface side of the cylindrical portion.

[0007] In the coil device according to the present invention, the bobbin is bonded to the base part on the end face side of the flange part, and is bonded to the outer leg part on the outer peripheral surface side of the cylindrical part. The bobbin is bonded to the core (base part and outer leg part) in both areas of the end face side of the flange part and the outer peripheral surface side of the cylindrical part, so that the bonding area between the bobbin and the core is increased and the bonding strength between the bobbin and the core is improved. Therefore, the bobbin and the core are firmly fixed, and the vibration resistance of the assembly consisting of the bobbin and the core is improved. This shifts the resonance frequency to a frequency higher than the operating frequency of the coil device, and it is possible to prevent the occurrence of resonance at the operating frequency of the coil device. In this way, the coil device according to the present invention contributes to preventing the coil device from breaking down by controlling the resonance.

[0008] The bobbin may have a partition portion between one end and the other end of the axial direction of the cylindrical portion, protruding radially outward from the outer peripheral surface of the cylindrical portion, and at least one of the flange portion and the partition portion may be bonded to the outer leg portion on the outer peripheral surface side of the cylindrical portion. By forming a partition portion on the outer peripheral surface of the cylindrical portion, it is possible to prevent the winding of the wire wound around the outer peripheral surface of the cylindrical portion from becoming erroneous. Also, by bonding at least one of the flange portion and the partition portion to the outer leg portion, it is possible to increase the adhesive strength between the bobbin and the core on the outer peripheral surface side of the cylindrical portion.

[0009] The flange may have a flange body protruding radially outward from the outer circumferential surface of the cylindrical portion and a flange protruding portion protruding from the flange body, and the flange protruding portion may be bonded to the outer leg portion on the outer circumferential surface side of the cylindrical portion. In this case, the flange protruding portion can be bonded to the outer leg portion at a position spaced apart from the outer circumferential surface of the cylindrical portion. Therefore, the adhesive is less likely to adhere to the wire, and deterioration of the magnetic properties of the coil device can be prevented.

[0010] The flange protrusion may extend above the outer leg. In this case, the flange protrusion can be easily bonded to the outer leg on the outer peripheral surface side of the cylindrical portion. This makes it easier to ensure a bonding area between the flange protrusion and the outer leg, and further increases the bonding strength between the bobbin and the core.

[0011] The partition may have a partition body protruding radially outward from the outer circumferential surface of the cylindrical portion and a partition protrusion protruding from the partition body, and the partition protrusion may be bonded to the outer leg on the outer circumferential surface side of the cylindrical portion. In this case, the partition protrusion can be bonded to the outer leg at a position separated from the outer circumferential surface of the cylindrical portion. Therefore, the adhesive is less likely to adhere to the wire, and deterioration of the magnetic properties of the coil device can be prevented.

[0012] The partitioning protrusion may extend above the outer leg. In this case, the partitioning protrusion can be easily bonded to the outer leg on the outer peripheral surface side of the cylindrical portion. This makes it easier to ensure a bonding area between the partitioning protrusion and the outer leg, and further increases the bonding strength between the bobbin and the core.

[0013] The flange has a flange body protruding radially outward from the outer peripheral surface of the tubular portion and a flange protruding portion protruding from the flange body, and both the flange and the partition portion are bonded to the outer leg portion on the outer peripheral surface side of the tubular portion, and an adhesive may be attached to the flange protruding portion, the partition protruding portion, and the core so as to connect the flange protruding portion and the partition protruding portion along the axial direction of the tubular portion. In this case, an adhesive region between the bobbin and the core can be formed over a wide range along the axial direction of the tubular portion on the outer peripheral surface side of the tubular portion. Therefore, the adhesive strength between the bobbin and the core is further improved, and the bobbin and the core can be firmly fixed.

[0014] The adhesive portion between the bobbin and the base portion and the adhesive portion between the bobbin and the outer leg portion may be discontinuous. In this case, the bobbin can be adhered to the core (the base portion and the outer leg portion) in different areas on the end face side of the flange portion and the outer peripheral surface side of the cylindrical portion. This improves the adhesive stability between the bobbin and the core, and further improves the vibration resistance of the assembly consisting of the bobbin and the core. [Brief description of the drawings]

[0015] [Figure 1A] FIG. 1A is a perspective view of a coil device according to a first embodiment of the present invention. [Figure 1B] FIG. 1B is a plan view of the coil device shown in FIG. 1A. [Diagram 2] FIG. 2 is an exploded perspective view of the coil device shown in FIG. 1A. [Figure 3A] FIG. 3A is a perspective view of the bobbin shown in FIG. [Figure 3B] FIG. 3B is a perspective view of the bobbin shown in FIG. 3A as viewed from the bottom side. [Figure 4] FIG. 4 is a partially transparent side view of the coil device shown in FIG. 1A. [Diagram 5] FIG. 5 is a partially transparent perspective view of the coil device shown in FIG. 1A. [Figure 6] FIG. 6 is a perspective view of a coil device according to the second embodiment of the present invention. [Figure 7] FIG. 7 is a perspective view of a bobbin of the coil device shown in FIG. [Figure 8] FIG. 8 is a perspective view of a coil device according to a third embodiment of the present invention. [Figure 9] FIG. 9 is a perspective view of a bobbin of the coil device shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The contents shown in the drawings are merely schematic and illustrative for understanding the present invention, and the appearance and dimensional ratios may differ from the actual product. Furthermore, the present invention is not limited to the following embodiment.

[0017] First embodiment The coil device 1 according to the first embodiment of the present invention shown in FIG. 1A is, for example, a surface-mounted transformer, and is mounted in an on-board charger for an EV (Electric Vehicle), a PHV (Plug-in Hybrid Vehicle) or a commuter vehicle, a power supply circuit for home or industrial electrical equipment, a power supply circuit for computer equipment, etc.

[0018] As shown in FIG. 2, the coil device 1 has cores 2a and 2b, a bobbin 3, and a wire 5. In addition to these components, the coil device 1 also has a cover 4, a terminal 6, and a tape 7, although these components are not essential. In FIG. 2 and other figures, the X-axis is an axis parallel to the axis of the bobbin 3. The Y-axis is an axis perpendicular to the axis of the bobbin 3 when the bobbin 3 is viewed in a plan view. The Z-axis is an axis perpendicular to the X-axis and the Y-axis. Hereinafter, the positive and negative sides of the Y-axis are referred to as lateral. Also, the positive side of the Z-axis is referred to as upper, and the negative side of the Z-axis is referred to as lower. Note that lower refers to the mounting surface side of the coil device 1, that is, the side on which a mounting board (not shown) on which the coil device 1 is mounted is disposed. Also, with respect to the X-axis and the Y-axis, the direction toward the center of the bobbin 3 is referred to as inward, and the direction away from the center of the bobbin 3 is referred to as outward.

[0019] The cores 2a and 2b are E-shaped cores and have the same shape. The cores 2a and 2b are magnetic bodies and are made of a ferrite composition, a metal composition, or a composite composition of these with resin. The cores 2a and 2b are attached to the bobbin 3 so as to face each other. The cores 2a and 2b each have a base portion 21, a pair of outer legs 22m and 22n, and a center leg portion 23.

[0020] A pair of outer legs 22m and 22n and a center leg 23 are connected to the base portion 21. One outer leg 22m is connected to one end of the base portion 21 in the Y-axis direction and protrudes along the X-axis so as to be perpendicular to the base portion 21. The other outer leg 22n is connected to the other end of the base portion 21 in the Y-axis direction and protrudes along the X-axis so as to be perpendicular to the base portion 21. The center leg 23 is located between the one outer leg 22m and the other outer leg 22n and protrudes along the X-axis so as to be perpendicular to the base portion 21.

[0021] The center leg 23 of the core 2a and the center leg 23 of the core 2b are fixed with, for example, an epoxy adhesive. Similarly, the outer leg 22m (22n) of the core 2a and the outer leg 22m (22n) of the core 2b are fixed with, for example, an epoxy adhesive. A gap may be formed along the X-axis at the butt joint between the center leg 23 of the core 2a and the center leg 23 of the core 2b. Also, a gap may be formed along the X-axis at the butt joint between the outer leg 22m (22n) of the core 2a and the outer leg 22m (22n) of the core 2b. By forming a gap, the leakage characteristics of the coil device 1 can be adjusted according to the length of the gap.

[0022] 3A, the bobbin 3 has a cylindrical portion 30. In addition to the cylindrical portion 30, the bobbin 3 may further have flanges 32a and 32b, partitions 33a to 33c, a passage 34, a plurality of (two in this embodiment) engaging protrusions 35a, a plurality of (two in this embodiment) engaging protrusions 35b, and terminal blocks 36a and 36b. The bobbin 3 is made of, for example, plastic such as PPS, PET, PBT, LCP, or nylon, or other insulating material (for example, a material having heat resistance).

[0023] The tube portion 30 is a bottomless cylindrical body and has a through hole 31. The axis of the tube portion 30 is arranged parallel to a mounting board (not shown) on which the coil device 1 is mounted. The cross-sectional shape (outline) of the tube portion 30 is rectangular, but may be a square, other polygonal, circular, elliptical, or the like. The middle leg portion 23 of the core 2a shown in FIG. 2 is inserted into the through hole 31 from one side in the X-axis direction, and the middle leg portion 23 of the core 2b is inserted from the other side in the X-axis direction. As shown in FIG. 2, a plurality of wires 5 are wound in a coil shape on the outer circumferential surface of the tube portion 30, and a plurality of coil portions 50 are formed. In this embodiment, six wires 5 are wound around the outer circumferential surface of the tube portion 30. However, the number of wires 5 wound around the outer circumferential surface of the tube portion 30 is not limited to this. For example, the number of wires 5 may be seven.

[0024] The wire 5 is made of a single wire, but may be a twisted wire such as a Litz wire. The diameter of the wire 5 is not particularly limited, but is, for example, 0.1 to 0.4 mm. The wire 5 may be an insulating coated wire in which a core wire made of a metal such as copper is coated with an insulating coating.

[0025] 3A, the flange portion 32a is formed at one end in the axial direction of the tubular portion 30, and protrudes radially outward from the outer circumferential surface of the tubular portion 30. The flange portion 32a has a flange main body 320a and a flange protruding portion 321a. The flange main body 320a protrudes radially outward from the outer circumferential surface of the tubular portion 30, and extends in the circumferential direction along the outer circumferential surface of the tubular portion 30. More specifically, the flange main body 320a extends along the Z axis on both side portions of the tubular portion 30 in the Y axis direction, and extends along the Y axis on the upper and lower portions of the tubular portion 30.

[0026] The flange protrusion 321a protrudes from the flange body 320a. More specifically, the flange protrusion 321a protrudes outward along the Y axis from both side portions (both side ends) of the flange body 320a in the Y axis direction. The flange protrusion 321a is formed on the upper portion of the flange body 320a, more specifically, on the portion where the upper portion and the side portion of the flange body 320a intersect. However, the side portion of the flange body 320a in the Y axis direction is a portion of the flange body 320a that extends longitudinally along the Z axis on the side portion of the tube portion 30 in the Y axis direction. Also, the upper portion of the flange body 320a is a portion of the flange body 320a that extends longitudinally along the Y axis on the upper portion of the tube portion 30.

[0027] As shown in Fig. 5, when the cores 2a and 2b are attached to the bobbin 3, the flange protrusion 321a extends over the outer legs 22m and 22n of the core 2a. The flange protrusion 321a protrudes toward the upper portion (upper surface) of the outer legs 22m and 22n of the core 2a, and the flange protrusion 321a and the outer legs 22m and 22n overlap when viewed from above. A gap is formed between the flange protrusion 321a and the outer leg 22m and between the flange protrusion 321a and the outer leg 22n. The protruding length L1 of the flange protrusion 321a from the flange main body 320a is smaller than the protruding length L2 of the flange main body 320a from the outer peripheral surface of the tube portion 30, but may be equal to or larger than the length L2. For example, the protruding length L1 of the flange protruding portion 321a from the flange main body 320a is ½ to 2 times the protruding length L2 of the flange main body 320a from the outer circumferential surface of the tube portion 30. A curved portion is formed on the outer periphery of the flange protruding portion 321a, which curves downward as it goes outward in the Y-axis direction.

[0028] 3A, the flange portion 32b is formed at the other axial end of the tube portion 30 and protrudes radially outward from the outer circumferential surface of the tube portion 30. The flange portion 32b has a flange main body 320b and a flange protruding portion 321b. The flange main body 320b protrudes radially outward from the outer circumferential surface of the tube portion 30 and extends in the circumferential direction along the outer circumferential surface of the tube portion 30. More specifically, the flange main body 320b extends along the Z axis on both side portions of the tube portion 30 in the Y axis direction, and extends along the Y axis on the upper and lower portions of the tube portion 30.

[0029] The flange protrusion 321b protrudes from the flange body 320b. More specifically, the flange protrusion 321b protrudes outward along the Y axis from both side portions (both side ends) of the flange body 320b in the Y axis direction. The flange protrusion 321b is formed on the upper portion of the flange body 320b, more specifically, on the portion where the upper portion and the side portion of the flange body 320b intersect. However, the side portion of the flange body 320b in the Y axis direction is a portion of the flange body 320b that extends longitudinally along the Z axis on the side portion of the tube portion 30 in the Y axis direction. Also, the upper portion of the flange body 320b is a portion of the flange body 320b that extends longitudinally along the Y axis on the upper portion of the tube portion 30.

[0030] 5, when the cores 2a and 2b are attached to the bobbin 3, the flange protrusion 321b extends over the outer legs 22m and 22n of the core 2b. The flange protrusion 321b protrudes toward the upper portions (upper surfaces) of the outer legs 22m and 22n of the core 2b, and the flange protrusion 321b overlaps with the outer legs 22m and 22n when viewed from above. Gaps are formed between the flange protrusion 321b and the outer leg 22m and between the flange protrusion 321b and the outer leg 22n.

[0031] The length of projection of the flange protrusion 321b from the flange body 320b is not particularly limited, but is the same as the length of projection L1 of the flange protrusion 321a from the flange body 320a described above. That is, the length of projection of the flange protrusion 321b from the flange body 320b may be smaller than, equal to, or larger than the length of projection of the flange body 320b from the outer circumferential surface of the tube portion 30. A curved portion is formed on the outer periphery of the flange protrusion 321b, which curves downward as it goes outward in the Y-axis direction.

[0032] As shown in FIG. 3A, the partitions 33a to 33c are formed between one end and the other end in the axial direction of the tubular portion 30, and protrude radially outward from the outer circumferential surface of the tubular portion 30. The partitions 33a to 33c are arranged at predetermined intervals along the axial direction of the tubular portion 30. The partitions 33a are adjacent to the flange portion 32a, and the partitions 33c are adjacent to the flange portion 32b. The partitions 33b are located between the partitions 33a and 33b. By forming the partitions 33a to 33c on the outer circumferential surface of the tubular portion 30, it is possible to prevent the wire 5 wound around the outer circumferential surface of the tubular portion 30 from becoming distorted.

[0033] The partition portions 33a to 33c include partition bodies 330a to 330c and partition protrusions 331a to 331c. The partition bodies 330a to 330c protrude radially outward from the outer circumferential surface of the tubular portion 30, and extend in the circumferential direction along the outer circumferential surface of the tubular portion 30. More specifically, the partition bodies 330a to 330c extend along the Z axis on both side portions of the tubular portion 30 in the Y axis direction, and extend along the Y axis on the upper and lower portions of the tubular portion 30.

[0034] The partition protrusions 331a to 331c protrude from the partition bodies 330a to 330c. More specifically, the partition protrusions 331a to 331c protrude outward along the Y axis from both side portions (both side ends) of the partition bodies 330a to 330c in the Y axis direction. The partition protrusions 331a to 331c are formed on the upper portions of the partition bodies 330a to 330c, more specifically, at the portions where the upper portions and side portions of the partition bodies 330a to 330c intersect. However, the side portions of the partition bodies 330a to 330c in the Y axis direction refer to the portions of the partition bodies 330a to 330c that extend longitudinally along the Z axis on the side portions of the tube portion 30 in the Y axis direction. Moreover, the upper parts of the partition bodies 330a to 330c refer to the parts of the partition bodies 330a to 330c that extend longitudinally along the Y axis above the tubular portion 30.

[0035] As shown in Fig. 5, when the cores 2a and 2b are attached to the bobbin 3, the partitioning protrusions 331a to 331c extend above the outer legs 22m and 22n of the cores 2a and 2b. The partitioning protrusions 331a to 331c protrude toward the upper portions (upper surfaces) of the outer legs 22m and 22n of the cores 2a and 2b, and the partitioning protrusions 331a to 331c overlap the outer legs 22m and 22n when viewed from above. Gaps are formed between the partitioning protrusions 331a to 331c and the outer leg 22m, and between the partitioning protrusions 331a to 331c and the outer leg 22n.

[0036] The protruding length of the partition protrusions 331a-331c from the partition bodies 330a-330c is not particularly limited, but is the same as the protruding length L1 of the flange protrusion 321a from the flange body 320a described above. That is, the protruding length of the partition protrusions 331a-331c from the partition bodies 330a-330c may be smaller than, equal to, or larger than the protruding length of the partition bodies 330a-330c from the outer circumferential surface of the tube portion 30. A curved portion is formed on the outer periphery of the partition protrusions 331a-331c, curving downward as it goes outward in the Y-axis direction.

[0037] 3A, a plurality (two in this embodiment) of groove-shaped (concave) passages 34 are formed at intervals along the Y axis in the upper portion of the partition body 330a. Similarly, two passages 34 are formed at intervals along the Y axis in the upper portion of the partition body 330b, and two passages 34 are formed at intervals along the Y axis in the upper portion of the partition body 330c.

[0038] 3B, a plurality (four in this embodiment) of groove-shaped (recessed) passages 34 are formed at intervals along the Y axis in the lower part of the partition body 330a (the part of the partition body 330a that extends longitudinally along the Y axis at the lower part of the tube portion 30). Similarly, four passages 34 are formed at intervals along the Y axis in the lower part of the partition body 330b, and four passages 34 are formed at intervals along the Y axis in the lower part of the partition body 330c.

[0039] The passage 34 formed in the upper part of the partition body 330a shown in FIG. 3A is for moving the wire 5 (FIG. 2) from one side to the other side in the X-axis direction of the partition body 330a when winding the wire 5 on the outer peripheral surface of the tube portion 30. Similarly, the passage 34 formed in the upper part of the partition body 330b is for moving the wire 5 from one side to the other side in the X-axis direction of the partition body 330b when winding the wire 5 on the outer peripheral surface of the tube portion 30. Similarly, the passage 34 formed in the upper part of the partition body 330c is for moving the wire 5 from one side to the other side in the X-axis direction of the partition body 330c when winding the wire 5 on the outer peripheral surface of the tube portion 30.

[0040] On the other hand, the passage 34 formed in the lower part of the partition body 330a shown in FIG. 3B is for moving the drawn-out portion 51 drawn out from any of the coil parts 50 (FIG. 2) formed on the outer peripheral surface of the tube part 30 from one side to the other side in the X-axis direction of the partition body 330a. Similarly, the passage 34 formed in the lower part of the partition body 330b is for moving the drawn-out portion 51 drawn out from any of the coil parts 50 formed on the outer peripheral surface of the tube part 30 from one side to the other side in the X-axis direction of the partition body 330b. Similarly, the passage 34 formed in the lower part of the partition body 330c is for moving the drawn-out portion 51 drawn out from any of the coil parts 50 formed on the outer peripheral surface of the tube part 30 from one side to the other side in the X-axis direction of the partition body 330c.

[0041] As shown in FIG. 3A, two engaging protrusions 35a are formed on end surface 322a of flange 32a, spaced apart along the Y axis. The two engaging protrusions 35a are formed on the upper part of partition body 330a. Similarly, two engaging protrusions 35b are formed on end surface 322b of flange 32b, spaced apart along the Y axis. The two engaging protrusions 35b are formed on the upper part of partition body 330b. The engaging protrusions 35a and 35b engage with engaging recesses 42a and 42b of cover 4 shown in FIG. 2.

[0042] The terminal block 36a is formed at one axial end of the cylindrical portion 30, and the terminal block 36b is formed at the other axial end of the cylindrical portion 30. The terminal blocks 36a and 36b are formed at the lower portion of the cylindrical portion 30. The terminal blocks 36a and 36b have the same shape, but may have different shapes. The terminal blocks 36a and 36b each have a main body portion 360, a partition portion 361, and a plurality of (seven in this embodiment) protrusions 362.

[0043] The main body 360 protrudes from the lower part of the tube part 30 to the outside in the axial direction at one end of the tube part 30 in the axial direction. The main body 360 has a width larger than the width of the tube part 30 along the Y axis, and protrudes outward along the Y axis from one end and the other end of the tube part 30 in the Y axis direction. The upper surface of the main body 360 is a flat surface, and is continuous so as to be flush with the inner wall surface of the through hole 31 (more specifically, the bottom surface of the through hole 31). As shown in FIG. 4 and FIG. 5, the base part 21 of the core 2a is disposed on the upper surface of the main body 360 of the terminal block 36a. The base part 21 of the core 2b is disposed on the upper surface of the main body 360 of the terminal block 36b. The length of the main body 360 along the Y axis is longer than the length of the base part 21 along the Y axis, but may be equal to or smaller than this.

[0044] In this embodiment, the upper surfaces of the main body portions 360 of the terminal blocks 36a and 36b shown in Fig. 5 and the base portions 21 of the cores 2a and 2b are not bonded with the adhesive 8 (see Fig. 1B). This is because no bonding space is provided between them in order to reduce the size of the coil device 1. However, the upper surfaces of the main body portions 360 of the terminal blocks 36a and 36b and the base portions 21 of the cores 2a and 2b may be bonded with the adhesive 8.

[0045] As shown in FIG. 3A, the partition wall 361 protrudes downward from the bottom surface of the main body 360 and extends from one end to the other end of the main body 360 in the Y-axis direction. The partition wall 361 of the terminal block 36a is located at approximately the same position as the flange 32a with respect to the X-axis so as to be continuous with the flange 32a. The partition wall 361 of the terminal block 36b is located at approximately the same position as the flange 32b with respect to the X-axis so as to be continuous with the flange 32b. As shown in FIG. 3B, a plurality of (four in this embodiment) groove-shaped (concave) passages 34 are formed at intervals along the Y-axis at the lower part of the partition wall 361 of the terminal block 36a. Similarly, a plurality of (four in this embodiment) groove-shaped (concave) passages 34 are formed at intervals along the Y-axis at the lower part of the partition wall 361 of the terminal block 36b.

[0046] The multiple protrusions 362 protrude downward from the bottom surface of the main body 360, and are formed at a predetermined interval from one end of the main body 360 in the Y-axis direction to the other end. In the main body 360, the multiple protrusions 362 and the partition wall 361 are located at ends opposite each other along the X-axis. Each of the multiple protrusions 362 has multiple terminals 6 (seven in this embodiment). The terminals 6 are integrally molded (insert molded) with the protrusions 362, but may be detachably attached to the protrusions 362.

[0047] The terminal 6 is made of a metal such as copper, and has, for example, a connecting portion 61 and a mounting portion 62. The connecting portion 61 protrudes outward along the X-axis from the main body portion 360. The mounting portion 62 protrudes downward from the bottom of the protruding portion 362 and is bent so as to extend along the X-axis.

[0048] The connecting portion 61 is connected to one of the lead-out portions 51 of the plurality of wires 5. The mounting portion 62 is connected to a circuit pattern of a circuit board or the like (not shown), and thus the coil device 1 is connected to the circuit board or the like via the terminals 6.

[0049] As shown in Fig. 1A, the cover 4 is attached to the bobbin 3. As shown in Fig. 2, the cover 4 has a cover body 40, fixing portions 41a and 41b, a plurality of (two in this embodiment) engaging recesses 42a, and a plurality of (two in this embodiment) engaging recesses 42b. The cover 4 is made of an insulating material (e.g., LCP or nylon) having better elasticity than the bobbin 3, but may be made of the same material as the bobbin 3.

[0050] The cover body 40 is a flat plate body, and covers the tube part 30 from above. As shown in FIG. 4, the cover body 40 is disposed above the flange parts 32a and 32b and the partition parts 33a to 33c so as to be in contact with them. The fixing part 41a is formed at one end of the cover body 40 in the X-axis direction, and extends downwardly where the tube part 30 is disposed so as to be perpendicular to the cover body 40. The fixing part 41b is formed at the other end of the cover body 40 in the X-axis direction, and extends downwardly where the tube part 30 is disposed so as to be perpendicular to the cover body 40. As shown in FIG. 2, the two engagement recesses 42a are formed in the fixing part 41a at a distance from each other along the Y-axis, and the two engagement recesses 42b are formed in the fixing part 41b at a distance from each other along the Y-axis. The two engagement recesses 42a are engaged with the two engagement protrusions 35a of the bobbin 3. The two engaging protrusions 35b of the bobbin 3 engage with the two engaging recesses 42b.

[0051] As shown in Fig. 1A, tape 7 is an insulating tape made of plastic, rubber, or the like, and surrounds the periphery of the core assembly consisting of cores 2a and 2b. Tape 7 is for fixing cores 2a and 2b so that the assembled structure of cores 2a and 2b is not released.

[0052] As shown in FIG. 1B, the bobbin 3 is bonded to the base portion 21 of the core 2a by an adhesive (resin) 8 at the end face 322a of the flange portion 32a (one axial side of the bobbin 3). The bobbin 3 is bonded to the base portion 21 of the core 2b by an adhesive 8 at the end face 322b of the flange portion 32b (the other axial side of the bobbin 3). The adhesive 8 is preferably a silicone adhesive. In this case, the adhesive 8 is provided with a function of absorbing vibrations or impacts, improving the vibration resistance of the assembly consisting of the bobbin 3 and the cores 2a and 2b. The adhesive 8 may be an epoxy adhesive or the like.

[0053] 1A, the adhesive 8 is attached from the end face 322a of the flange 32a to the base portion 21 of the core 2a, and a portion of the adhesive 8 is attached to the fixing portion 41a of the cover 4. In other words, the end face 322a of the flange 32a is bonded to the base portion 21 of the core 2a together with the fixing portion 41a of the cover 4 by the adhesive 8.

[0054] Although detailed illustration is omitted, the adhesive 8 is attached from the end face 322b (FIG. 3A) of the flange portion 32b to the base portion 21 of the core 2b, and a part of the adhesive 8 is attached to the fixing portion 41b (FIG. 2) of the cover 4. That is, the end face 322b of the flange portion 32b is bonded to the base portion 21 of the core 2b together with the fixing portion 41b of the cover 4 by the adhesive 8.

[0055] 1B, the adhesive 8 covers a part of the upper surface of the base portion 21 of the core 2a on the end surface 322a side of the flange portion 32a, and also covers a part of the upper surface of the base portion 21 of the core 2b on the end surface 322b side of the flange portion 32b. However, the application range of the adhesive 8 is not limited to the range shown in FIG. 1B.

[0056] The adhesive 8 is present in a part of the region (central region) between one end and the other end of the end face 322a in the Y-axis direction, and is not present in the entire region between one end and the other end of the end face 322a of the flange 32a in the Y-axis direction. However, the adhesive 8 may be present in the entire region between one end and the other end of the end face 322a of the flange 32a in the Y-axis direction.

[0057] The bobbin 3 is also bonded to the outer legs 22m and 22n of the core 2a by the adhesive 8 on the outer peripheral surface side of the cylindrical portion 30 (the side of the cylindrical portion 30 in the Y-axis direction). The bobbin 3 is also bonded to the outer legs 22m and 22n of the core 2b by the adhesive 8 on the outer peripheral surface side of the cylindrical portion 30 (the side of the cylindrical portion 30 in the Y-axis direction).

[0058] In this embodiment, the flanges 32a and 32b and the partitions 33a to 33c are bonded to the outer legs 22m and 22n of the core 2a or 2b by the adhesive 8 on the outer peripheral surface side of the cylindrical portion 30. In particular, the flange protruding portion 321a of the flange 32a is bonded to the outer legs 22m and 22n of the core 2a by the adhesive 8 on the outer peripheral surface side of the cylindrical portion 30. Also, the flange protruding portion 321b of the flange 32b is bonded to the outer legs 22m and 22n of the core 2b by the adhesive 8 on the outer peripheral surface side of the cylindrical portion 30.

[0059] In addition, of the partition portion 33a, the partition protrusion 331a is bonded by the adhesive 8 to the outer legs 22m and 22n of the core 2a on the outer peripheral surface side of the cylindrical portion 30. In addition, of the partition portion 33b, the partition protrusion 331b is bonded by the adhesive 8 to the outer legs 22m and 22n of the core 2a or 2b on the outer peripheral surface side of the cylindrical portion 30. In addition, of the partition portion 33c, the partition protrusion 331c is bonded by the adhesive 8 to the outer legs 22m and 22n of the core 2b on the outer peripheral surface side of the cylindrical portion 30.

[0060] In addition to the flange protrusion 321a, the flange body 320a may be bonded to the outer legs 22m and 22n of the core 2a on the outer peripheral surface side of the tubular portion 30 by the adhesive 8. In addition to the flange protrusion 321b, the flange body 320b may be bonded to the outer legs 22m and 22n of the core 2b on the outer peripheral surface side of the tubular portion 30 by the adhesive 8.

[0061] In addition to the partition protrusion 331a, the partition body 330a may be bonded to the outer legs 22m and 22n of the core 2a on the outer peripheral surface side of the tubular portion 30 by the adhesive 8. In addition to the partition protrusion 331b, the partition body 330b may be bonded to the outer legs 22m and 22n of the core 2a or 2b on the outer peripheral surface side of the tubular portion 30 by the adhesive 8. In addition to the partition protrusion 331c, the partition body 330c may be bonded to the outer legs 22m and 22n of the core 2b on the outer peripheral surface side of the tubular portion 30 by the adhesive 8.

[0062] The adhesive 8 is attached to the flange convex portions 321a and 321b, the partition convex portions 331a to 331c, and the cores 2a and 2b so as to continuously connect the flange convex portion 321a, the partition convex portion 331a, the partition convex portion 331b, the partition convex portion 331c, and the flange convex portion 321b along the axial direction (X-axis direction) of the tube portion 30. The adhesive 8 connects the flange convex portion 321a and the partition convex portion 331a, the partition convex portion 331a and the partition convex portion 331b, the partition convex portion 331b and the partition convex portion 331c, and the partition convex portion 331c and the flange convex portion 321b.

[0063] However, the adhesive 8 may be locally (discontinuously) attached to each of the positions of the flange convex portion 321a, the partition convex portion 331a, the partition convex portion 331b, the partition convex portion 331c, and the flange convex portion 321b. The adhesive 8 is present over the entire area between the flange convex portion 321a and the flange convex portion 321b along the X-axis, but may be present in a part of the area between the flange convex portion 321a and the flange convex portion 321b.

[0064] Also, the adhesive 8 may be discontinuously (locally) attached to the first bonding position (the outer leg 22m of the core 2a) and the second bonding position (the outer leg 22m of the core 2b) on both sides of the butt portion along the X-axis so as to avoid the butt portion between the outer leg 22m of the core 2a and the outer leg 22m of the core 2b. In this case, the adhesive 8 is less likely to enter the butt portion between the outer leg 22m of the core 2a and the outer leg 22m of the core 2b, and deterioration of the inductance characteristics of the coil device 1 can be prevented. Similarly, the adhesive 8 may be discontinuously (locally) attached to the first bonding position (the outer leg 22n of the core 2a) and the second bonding position (the outer leg 22n of the core 2b) on both sides of the butt portion along the X-axis so as to avoid the butt portion between the outer leg 22n of the core 2a and the outer leg 22n of the core 2b.

[0065] On the outer peripheral surface side of the tubular portion 30, a portion of the adhesive 8 attached to the outer legs 22m and 22n of the core 2a may extend to the base portion 21 of the core 2a. Also, on the outer peripheral surface side of the tubular portion 30, a portion of the adhesive 8 attached to the outer legs 22m and 22n of the core 2b may extend to the base portion 21 of the core 2b.

[0066] Only one of the flanges 32a and 32b may be bonded to the outer legs 22m and 22n of the core 2a or 2b on the outer peripheral surface side of the cylindrical portion 30 by the adhesive 8. Also, only one or two of the partitions 33a to 33c may be bonded to the outer legs 22m and 22n of the core 2a or 2b on the outer peripheral surface side of the cylindrical portion 30 by the adhesive 8.

[0067] Furthermore, among the flanges 32a and 32b and the partitions 33a to 33c, only the flanges 32a and 32b may be bonded to the outer legs 22m and 22n of the core 2a or 2b on the outer peripheral surface side of the cylindrical portion 30 by the adhesive 8. Alternatively, only the partitions 33a to 33c may be bonded to the outer legs 22m and 22n of the core 2a or 2b on the outer peripheral surface side of the cylindrical portion 30 by the adhesive 8.

[0068] The adhesive 8 covers a portion of the upper surface of each of the outer legs 22m and 22n of the core 2a and also covers a portion of the upper surface of each of the outer legs 22m and 22n of the core 2b on the outer peripheral surface side of the cylindrical portion 30. However, the application range of the adhesive 8 is not limited to the range shown in FIG. 1B.

[0069] As shown in FIG. 1A and FIG. 1B, the adhesive 8 covers a part (lower part) of the flange convex part 321a so that the upper part of the flange convex part 321a is exposed, but may cover the entire flange convex part 321a. Also, the adhesive 8 covers a part (lower part) of the flange convex part 321b so that the upper part of the flange convex part 321b is exposed, but may cover the entire flange convex part 321b. Also, the adhesive 8 covers a part (lower part) of the partition convex part 331a so that the upper part of the partition convex part 331a is exposed, but may cover the entire partition convex part 331a. Also, the adhesive 8 covers a part (lower part) of the partition convex part 331b so that the upper part of the partition convex part 331b is exposed, but may cover the entire partition convex part 331b. Furthermore, the adhesive 8 covers a part (lower part) of the partitioning convex part 331c so that the upper part of the partitioning convex part 331c is exposed, but may cover the entire partitioning convex part 331c.

[0070] The adhesive portion on the end face 322a side of the flange 32a (the adhesive portion between the bobbin 3 and the base portion 21) and the adhesive portion on the outer circumferential surface side of the tube portion 30 (the adhesive portion between the bobbin 3 and the outer legs 22m and 22n) are discontinuous, but they may be continuous. Similarly, the adhesive portion on the end face 322b side of the flange 32b (the adhesive portion between the bobbin 3 and the base portion 21) and the adhesive portion on the outer circumferential surface side of the tube portion 30 (the adhesive portion between the bobbin 3 and the outer legs 22m and 22n) are discontinuous, but they may be continuous.

[0071] Next, an example of a manufacturing method of the coil device 1 will be described. First, the components shown in FIG. 2 are prepared. Next, a plurality of wires 5 are wound around the outer peripheral surface of the cylindrical portion 30 of the bobbin 3 to form a plurality of coil portions 50. Next, the lead-out portions 51 of the plurality of wires 5 are connected to the respective connection portions 61 (FIG. 3A) of the plurality of terminals 6 by crimping, thermocompression, laser welding, soldering, or the like. Next, a cover 4 is attached to the bobbin 3.

[0072] Next, the center leg portion 23 of the core 2a is inserted into the through hole 31 of the bobbin 3, and the core 2a is attached to the bobbin 3. Also, the center leg portion 23 of the core 2b is inserted into the through hole 31 of the bobbin 3, and the core 2b is attached to the bobbin 3. Next, tape 7 is attached around the core assembly consisting of the cores 2a and 2b.

[0073] Next, as shown in FIGS. 1A and 1B, the bobbin 3 is adhered (applied) to the base portion 21 of the core 2a on the end surface 322a side of the flange portion 32a, and the bobbin 3 is adhered (applied) to the base portion 21 of the core 2b on the end surface 322b side of the flange portion 32b.

[0074] More specifically, the end face 322a of the flange 32a is bonded to the base portion 21 of the core 2a by the adhesive 8. Also, the end face 322b of the flange 32b is bonded to the base portion 21 of the core 2b by the adhesive 8. In FIG. 1A, the fixing portion 41a of the cover 4 is also bonded to the base portion 21, but only the end face 322a of the flange 32a may be bonded to the base portion 21 of the core 2a. Similarly, the fixing portion 41b of the cover 4 is also bonded to the base portion 21, but only the end face 322b of the flange 32b may be bonded to the base portion 21 of the core 2b.

[0075] Furthermore, on the outer peripheral surface side of the bobbin 3, the bobbin 3 is bonded to the outer legs 22m and 22n of the core 2a, and the bobbin 3 is bonded to the outer legs 22m and 22n of the core 2b. More specifically, the flange protrusion 321a, the partition protrusions 331a to 331c, and the flange protrusion 321b are bonded to the outer legs 22m and 22n of the core 2a or 2b by the adhesive 8. In this manner, the coil device 1 can be manufactured.

[0076] As shown in FIG. 1B, in the coil device 1 of this embodiment, the bobbin 3 is bonded to the base portion 21 on the end face 322a side of the flange portion 32a, and is bonded to the outer legs 22m and 22n on the outer peripheral surface side of the tube portion 30. By bonding the bobbin 3 to the core 2a (the base portion 21 and the outer legs 22m and 22n) in both areas of the end face 322a side of the flange portion 32a and the outer peripheral surface side of the tube portion 30, the bonding area between the bobbin 3 and the core 2a is increased, and the bonding strength between the bobbin 3 and the core 2a is improved. Therefore, the bobbin 3 and the core 2a are firmly fixed, and the vibration resistance of the assembly consisting of the bobbin 3 and the core 2a is improved. As a result, the resonance frequency is shifted to a frequency higher than the operating frequency of the coil device 1, and the occurrence of resonance at the operating frequency of the coil device 1 can be prevented. In this way, in the coil device 1 of this embodiment, the resonance is controlled, thereby contributing to preventing the coil device 1 from breaking down.

[0077] According to experiments conducted by the present inventors, it was confirmed by simulation that the resonant frequency can be shifted to a frequency higher than 2000 Hz, while the operating frequency band of the coil device 1 of this embodiment is 10 to 2000 Hz.

[0078] Moreover, the flange portion 32a and the partition portions 33a to 33c are bonded to the outer leg portions 22m and 22n on the outer peripheral surface side of the cylindrical portion 30. Therefore, the adhesive strength between the bobbin 3 and the core 2a on the outer peripheral surface side of the cylindrical portion 30 can be increased.

[0079] Moreover, the flange protrusion 321a is bonded to the outer legs 22m and 22n on the outer peripheral surface side of the tube portion 30. Therefore, the flange protrusion 321a can be bonded to the outer legs 22m and 22n at a position spaced apart from the outer peripheral surface of the tube portion 30. This makes it difficult for the adhesive 8 to adhere to the wire 5, and deterioration of the magnetic characteristics of the coil device 1 can be prevented.

[0080] In addition, the flange protrusion 321a extends over the outer legs 22m and 22n. This makes it easier to bond the flange protrusion 321a to the outer legs 22m and 22n on the outer peripheral surface side of the tube portion 30. This makes it easier to ensure a bonding area between the flange protrusion 321a and the outer legs 22m and 22n, and further increases the bonding strength between the bobbin 3 and the core 2a.

[0081] Moreover, the partitioning protrusions 331a to 331c are bonded to the outer legs 22m and 22n on the outer peripheral surface side of the cylindrical portion 30. Therefore, the partitioning protrusions 331a to 331c can be bonded to the outer legs 22m and 22n at positions spaced apart from the outer peripheral surface of the cylindrical portion 30. This makes it difficult for the adhesive 8 to adhere to the wire 5, and deterioration of the magnetic characteristics of the coil device 1 can be prevented.

[0082] In addition, the partitioning protrusions 331a to 331c extend above the outer legs 22m and 22n. This makes it easier to bond the partitioning protrusions 331a to 331c to the outer legs 22m and 22n on the outer peripheral surface side of the tube portion 30. This makes it easier to ensure a sufficient bonding area between the partitioning protrusions 331a to 331c and the outer legs 22m and 22n, and further increases the bonding strength between the bobbin 3 and the core 2a.

[0083] Moreover, the adhesive 8 is attached to the flange convex portion 321a, the partition convex portions 331a to 331c, and the core 2a so as to connect between the flange convex portion 321a and the partition convex portions 331a to 331c along the axial direction of the tubular portion 30. Therefore, on the outer circumferential surface side of the tubular portion 30, a bonding region between the bobbin 3 and the core 2a can be formed over a wide range along the axial direction of the tubular portion 30. Therefore, the bonding strength between the bobbin 3 and the core 2a is further improved, and the bobbin 3 and the core 2a can be firmly fixed.

[0084] In addition, the bonded portion between the bobbin 3 and the base portion 21 and the bonded portion between the bobbin 3 and the outer legs 22m and 22n are discontinuous. Therefore, the bobbin 3 can be bonded to the core 2a (the base portion 21 and the outer legs 22m and 22n) in different areas on the end face 322a side of the flange portion 32a and on the outer peripheral surface side of the cylindrical portion 30. This improves the bond stability between the bobbin 3 and the core 2a, and further improves the vibration resistance of the assembly consisting of the bobbin 3 and the core 2a.

[0085] Second embodiment The coil device 1A of the second embodiment shown in Fig. 6 has a similar configuration to the coil device 1 of the first embodiment, except for the following points. The same reference numerals are given to the parts that overlap with the coil device 1 of the first embodiment, and detailed descriptions thereof will be omitted.

[0086] The coil device 1A has a bobbin 3A. As shown in Fig. 7, the bobbin 3A has flanges 32aA and 32bA. The flange 32aA is different from the flange 32a (Fig. 3A) of the first embodiment in that it does not have a flange protrusion 321a. The flange 32bA is different from the flange 32b (Fig. 3A) of the first embodiment in that it does not have a flange protrusion 321b.

[0087] 6, the bobbin 3A is bonded to the outer legs 22m and 22n of the core 2a and to the outer legs 22m and 22n of the core 2b by an adhesive 8 on the outer peripheral surface side of the cylindrical portion 30. More specifically, the partitioning protrusions 331a to 331c are bonded to the outer legs 22m and 22n of the core 2a or 2b by an adhesive 8 on the outer peripheral surface side of the cylindrical portion 30.

[0088] The adhesive 8 is applied to the partition convex portions 331a to 331c so as to continuously connect the partition convex portions 331a, 331b, and 331c along the axial direction (X-axis direction) of the tube portion 30. The adhesive 8 connects the partition convex portions 331a and 331b, and the partition convex portions 331b and 331c.

[0089] However, the adhesive 8 may be locally (discontinuously) attached to each of the partitioning protrusions 331a, 331b, and 331c. The adhesive 8 is present over the entire area between the partitioning protrusions 331a and 331c along the X-axis, but may be present in a part of the area between the partitioning protrusions 331a and 331c.

[0090] The adhesive 8 may be present discontinuously (locally) at a first bonding position (the outer leg 22m of the core 2a) and a second bonding position (the outer leg 22m of the core 2b) on both sides of the butt portion along the X axis so as to avoid the butt portion between the outer leg 22m of the core 2a and the outer leg 22m of the core 2b. Similarly, the adhesive 8 may be present discontinuously (locally) at a first bonding position (the outer leg 22n of the core 2a) and a second bonding position (the outer leg 22n of the core 2b) on both sides of the butt portion along the X axis so as to avoid the butt portion between the outer leg 22n of the core 2a and the outer leg 22n of the core 2b.

[0091] In this embodiment, too, it is possible to obtain the same effects as in the first embodiment. In addition, in this embodiment, since the adhesive 8 is not applied to the flange portions 32aA and 32bA, the adhesive 8 is less likely to adhere to the wire 5 wound around the cylindrical portion 30, and deterioration of the magnetic properties of the coil device 1A can be prevented.

[0092] Third embodiment The coil device 1B of the second embodiment shown in Fig. 8 has a similar configuration to the coil device 1 of the first embodiment, except for the following points. The same reference numerals are given to the parts that overlap with the coil device 1 of the first embodiment, and detailed descriptions thereof will be omitted.

[0093] The coil device 1B has a bobbin 3B. As shown in Fig. 9, the bobbin 3B has partitioning portions 33aB to 33cB. The partitioning portions 33aB to 33cB differ from the partitioning portions 33a to 33c (Fig. 3A) of the first embodiment in that they do not include the partitioning protrusions 331a to 331c.

[0094] 8, the bobbin 3B is bonded to the outer legs 22m and 22n of the core 2a and to the outer legs 22m and 22n of the core 2b by adhesive 8 on the outer peripheral surface side of the cylindrical portion 30. More specifically, the flange protrusion 321a is bonded to the outer legs 22m and 22n of the core 2a by adhesive 8 on the outer peripheral surface side of the cylindrical portion 30. In addition, the flange protrusion 321b is bonded to the outer legs 22m and 22n of the core 2b by adhesive 8 on the outer peripheral surface side of the cylindrical portion 30.

[0095] In this embodiment, the same effects as those in the first embodiment can be obtained. In addition, in this embodiment, since the adhesive 8 is not applied to the partitions 33aB to 33cB, the adhesive 8 is less likely to adhere to the wire 5 wound around the cylindrical portion 30, and deterioration of the magnetic characteristics of the coil device 1B can be prevented. Furthermore, since the adhesive 8 is not applied to the partitions 33aB to 33cB, the adhesive 8 is less likely to get into the butted portion between the outer leg 22m (22n) of the core 2a and the outer leg 22m (22n) of the core 2b, and deterioration of the inductance characteristics of the coil device 1B can be prevented.

[0096] The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention.

[0097] For example, as shown in FIG. 1A, both cores 2a and 2b are E-type cores, but one of them may be an E-type core and the other an I-type core. Also, both cores 2a and 2b may be U-type cores. Also, one of cores 2a and 2b may be a U-type core and the other an I-type core. Also, the E-type core and the U-type core may have a split structure.

[0098] In the first embodiment, the flange 32a and the partitions 33a to 33c are bonded to the outer legs 22m and 22n on the outer peripheral surface side of the tubular portion 30. However, either one of the flange 32a and the partitions 33a to 33c may be bonded to the outer legs 22m and 22n on the outer peripheral surface side of the tubular portion 30.

[0099] In the first embodiment, the convex portion (flange convex portion 321a, flange convex portion 321b, partition convex portions 331a to 331c) may be omitted from any of flange portion 32a, flange portion 32b, partition portion 33a, partition portion 33b, and partition portion 33c. [Explanation of symbols]

[0100] 1, 1A, 1B... Coil device 2a, 2b...Core 21…Base section 22m, 22n…outer leg 23...middle leg 3, 3A, 3B…Bobbin 30...Cylinder part 31...Through hole 32a, 32b, 32aA, 32bA…Trim part 320a, 320b…Tsuba body 321a, 321b… flange protrusion 322a, 322b…end face 33a~33c, 33aB~33cB...Partition 330a~330c…Partition body 331a~331c…Partition protrusion 34...Aisle 35a, 35b...Engagement protrusion 36a,36b…terminal block 360…Main body 361...Bulkhead part 362…Convex part 4. Cover 40…Cover body 41a, 41b…Fixed part 42a, 42b...Engagement recess 5…Wire 50…Coil section 51...Drawer part 6…Terminal 61...Connection section 62…Mounting section 7. Tape 8…Adhesive

Claims

1. a bobbin having a cylindrical portion and a flange portion protruding radially outward from an outer circumferential surface of the cylindrical portion at one axial end of the cylindrical portion; A wire wound around an outer circumferential surface of the cylindrical portion; a core attached to the bobbin; The core has a base portion and an outer leg portion perpendicular to the base portion, The bobbin is bonded to the base portion on an end face side of the flange portion and to the outer leg portion on an outer peripheral surface side of the cylindrical portion.

2. the bobbin has a partition portion protruding radially outward from an outer circumferential surface of the cylindrical portion between one end and the other end in an axial direction of the cylindrical portion, The coil device according to claim 1 , wherein at least one of the flange portion and the partition portion is bonded to the outer leg portion on an outer circumferential surface side of the cylindrical portion.

3. The flange portion has a flange body protruding radially outward from an outer circumferential surface of the cylindrical portion, and a flange protruding portion protruding from the flange body, The coil device according to claim 1 or 2, wherein the flange protrusion is bonded to the outer leg on an outer circumferential surface side of the cylindrical portion.

4. The coil device according to claim 3 , wherein the flange protrusion extends over the outer leg.

5. The partition portion has a partition main body protruding radially outward from an outer circumferential surface of the cylindrical portion and a partition protrusion protruding from the partition main body, The coil device according to claim 2 , wherein the partitioning protrusion is bonded to the outer leg on an outer circumferential surface side of the cylindrical portion.

6. The coil device according to claim 5 , wherein the partitioning protrusion extends over the outer leg.

7. The flange portion has a flange body protruding radially outward from an outer circumferential surface of the cylindrical portion, and a flange protruding portion protruding from the flange body, Both the flange portion and the partition portion are bonded to the outer leg portion on an outer circumferential surface side of the cylindrical portion, The coil device according to claim 5 or 6, wherein an adhesive is applied to the flange convex portion, the partition convex portion and the core so as to connect the flange convex portion and the partition convex portion along the axial direction of the cylindrical portion.

8. 3. The coil device according to claim 1, wherein an adhesive portion between the bobbin and the base portion and an adhesive portion between the bobbin and the outer leg portion are discontinuous.

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