Coil arrangement

Abstract

The present application has an object to provide a coil device that can be reduced in height and size and has excellent heat dissipation. A coil device (10) has a bobbin (20). The bobbin (20) has a first cylinder (21) in which a wire (40) is wound, a second cylinder (22) in which the wire (40) or a wire (40) different from the wire (40) is wound, and a linking portion (23) linking the first cylinder (21) and the second cylinder (22). A core is attached to the bobbin. The core has a first core (51) having a first middle leg (512) inserted into the inside of the first cylinder (22) along an X axis, a second core (52) having a second middle leg (522) inserted into the inside of the second cylinder (22) from the opposite side of the first middle leg (512) along the X axis, and an intermediate core (53) having at least two divided pieces (53a, 53b) inserted into the linking portion (23) from a direction substantially perpendicular to the X axis and combined to be plate-shaped.

Description

TECHNICAL FIELD

[0001] The present application relates to a coil device used as a transformer or the like, for example. BACKGROUND

[0002] As a conventional low-height type transformer, a coil device as shown in Patent Document 1 or Patent Document 2 is known.

[0003] However, in the conventional coil device, the core is arranged in the axial direction on the base having the terminal electrode, and thus it is found that the heat dissipation is insufficient, and it is difficult to cope with the large current and the miniaturization in recent years.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT DOCUMENTS

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 6-196341

[0007] Patent Document 2: Japanese Patent Application Laid-Open No. 10-55925 SUMMARY

[0008] PROBLEMS TO BE SOLVED BY THE INVENTION

[0009] The present application has been achieved in view of such a situation, and has an object to provide a coil device which can be low-heightized and miniaturized, and which has excellent heat dissipation.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] In order to achieve the above object, the coil device of the present application has:

[0012] a bobbin having a first cylinder in which a wire is wound, a second cylinder in which the wire or a wire different from the wire is wound, and a connecting portion connecting the first cylinder and the second cylinder;

[0013] a first core having a first middle leg inserted into the inside of the first cylinder along a first axis;

[0014] a second core having a second middle leg inserted into the inside of the second cylinder from the opposite side of the first middle leg along the first axis; and

[0015] an intermediate core having at least two divided pieces inserted into the connecting portion from a direction substantially perpendicular to the first axis and combined to be plate-shaped.

[0016] In the coil device of the present application, the intermediate core has a plurality of divided pieces, and the core is formed by inserting the divided pieces into the connecting portion of the bobbin from a direction substantially perpendicular to the first axis and combining them into a plate shape. Therefore, in the connecting portion of the bobbin, the members between the plurality of openings for inserting the divided pieces are easily structured to have a reinforcing structure, and the mechanical strength of the connecting portion of the bobbin is improved. As a result, it is not necessary to provide a base or the like for improving the mechanical strength of the bobbin.

[0017] In the coil device of the present application, it is not necessary to provide a base or the like in the bobbin, and therefore, there is no base of the bobbin in the heat dissipation path of the heat accumulated in the first core, the second core, or the intermediate core. As a result, the cores can be brought into contact with members having excellent heat dissipation properties to dissipate heat, and the heat dissipation properties are improved. In addition, it is not necessary to form a base or the like in the bobbin, and therefore, the low height and the small size of the coil device can be easily achieved.

[0018] Preferably, the coil device further has a housing that accommodates the bobbin in which the wire is wound and in which the first core, the second core, and the intermediate core are installed. Preferably, the inside of the housing is filled with, for example, a heat dissipation resin. By thus configuring, heat generated in the wire, the first core, the second core, and the intermediate core is dissipated via the heat dissipation resin and the housing, and the heat dissipation properties are improved.

[0019] Preferably, the divided pieces are inserted into the connecting portion from different directions and are combined inside the connecting portion. By thus configuring, it is easy to improve the strength of the connecting portion, and it is easy to increase the portion and the area of the intermediate core constituted by the divided pieces that are exposed to the outside of the bobbin, and the heat dissipation properties are also improved.

[0020] Preferably, in the inside of the bobbin, the front end surface of the first intermediate leg is in contact with or faces the other plate-shaped second surface of the intermediate core with a prescribed gap.

[0021] In the inside of the bobbin, the front end surface of the second intermediate leg is in contact with or faces the other plate-shaped second surface of the intermediate core with a prescribed gap.

[0022] Even if the intermediate core is a combination of divided pieces, it is easy to adopt the structure described above, and it is easy to adjust the inductance of the coil device or the like. In addition, by bonding the front end surface of the first intermediate leg to the plate-shaped first surface of the intermediate core or the like, it is possible to bond the front end surface of the first intermediate leg to a plurality of divided pieces, and the bonding strength thereof is also improved. Alternatively, by bonding the front end surface of the second intermediate leg to the plate-shaped second surface of the intermediate core or the like, it is possible to bond the front end surface of the second intermediate leg to a plurality of divided pieces, and the bonding strength thereof is also improved.

[0023] It is preferable that the axis core of the first bobbin and the axis core of the second bobbin are arranged to be coaxial with the connecting portion interposed therebetween, and the axis core of the first bobbin is substantially parallel to the arrangement surface of the coil device. By so configuring, low height and small size become easy.

[0024] It is preferable that the first core has:

[0025] a first base to which the base end of the first middle leg is connected; and

[0026] a pair of first outer legs which are connected to the first base in a manner of being substantially parallel to both sides of the first middle leg along a second axis which is substantially perpendicular to the first axis. That is, the first core can also be a so-called E-shaped core.

[0027] Further, it is preferable that the second core has:

[0028] a second base to which the base end of the second middle leg is connected; and

[0029] a pair of second outer legs which are connected to the second base in a manner of being substantially parallel to both sides of the second middle leg along the second axis. That is, the second core can also be a so-called E-shaped core.

[0030] It is preferable that the first base has:

[0031] a first base body which includes a region to which the base end of the first middle leg is connected; and

[0032] a pair of first support protrusions which protrude from both sides of the first base body along a third axis which is substantially perpendicular to both the first axis and the second axis, and bear a part of the load of the coil device,

[0033] Further, a first support side recess can be formed between the pair of first support protrusions.

[0034] Further, it is preferable that the second base has:

[0035] a second base body which includes a region to which the base end of the second middle leg is connected; and

[0036] a pair of second support protrusions which protrude from both sides of the second base body along the third axis, and bear a part of the load of the coil device,

[0037] Further, a second support side recess can be formed between the pair of second support protrusions.

[0038] The support protrusions of the core protrude in a manner to bear a portion of the load of the coil device, whereby heat from the coil device is easily transferred through the support protrusions of the core, for example, to the underside of the housing near the cooling mechanism (e.g., a heat sink or cooling heat pipe, etc.), and heat dissipation is further improved. In addition, by forming support side recesses between the support protrusions, heat dissipation resin filled in the interior of the housing easily enters the interior of the coil device from the support side recesses, and heat dissipation is further improved. In addition, a lower side cover that protrudes in the first axis direction from the flange of the bobbin can also be provided in the support side recesses, insulation can also be improved, and the core can also be maintained.

[0039] Preferably, the first base further has:

[0040] a pair of first opposite side protrusions that protrude in the opposite direction of the first support protrusions along the third axis from both sides of the first base body along the second axis,

[0041] a first opposite side recess is formed between the pair of first opposite side protrusions,

[0042] The protrusion height of the first support protrusions along the third axis from the first base body is smaller than the protrusion height of the first opposite side protrusions along the third axis from the first base body.

[0043] In addition, preferably, the second base further has:

[0044] a pair of second opposite side protrusions that protrude in the opposite direction of the second support protrusions along the third axis from both sides of the second base body along the second axis,

[0045] a second opposite side recess is formed between the pair of second opposite side protrusions,

[0046] The protrusion height of the second support protrusions along the third axis from the second base body is smaller than the protrusion height of the second opposite side protrusions along the third axis from the second base body.

[0047] By reducing the protrusion height of the support protrusions, the outer peripheral position of the wire wound around the first bobbin and / or the second bobbin is close to, for example, the bottom of the housing near the cooling mechanism, and heat from the wire is also easily directly dissipated, and heat dissipation is further improved. In addition, by increasing the protrusion height of the opposite side protrusions, the depth of the opposite side recesses formed between the opposite side protrusions can also be made deep, and the space in this portion can also be used as a space for wire winding, etc. In addition, a cover that protrudes in the first axis direction from the flange of the bobbin can also be provided in the opposite side recesses, insulation can also be improved, and the core can also be maintained.

[0048] Preferably, a first flange that insulates the inner surface of the first base from the outer periphery of the first cylinder is integrally provided with the bobbin at one end of the bobbin in the first axis direction. Also, a second flange that insulates the inner surface of the second base from the outer periphery of the second cylinder is integrally provided with the bobbin at the other end of the bobbin in the first axis direction. Also, a first intermediate flange that insulates the inner side of the connecting portion from the outer periphery of the first cylinder is integrally provided with the bobbin at the boundary between the connecting portion and the first cylinder. Further, a second intermediate flange that insulates the inner side of the connecting portion from the outer periphery of the second cylinder is integrally provided with the bobbin at the boundary between the connecting portion and the second cylinder.

[0049] A wire slot through which the wire can pass can be provided in the first intermediate flange and / or the second intermediate flange. Also, similarly, a wire slot through which the wire can pass can be provided in the first flange and / or the second flange. With this configuration, the degree of freedom of the wiring of the wire between the first cylinder and the second cylinder is increased, and the degree of freedom of the lead of the wire is increased. Thus, the coil device of the present application can be used as a single transformer, or as a coil device that integrates a plurality of transformers, and the design of the transformer or other circuit becomes easy.

[0050] Preferably, a terminal block connecting portion that connects the first intermediate flange and the second intermediate flange in a manner of being supported by these flanges can be provided in the first intermediate flange and the second intermediate flange. The terminal block that has a terminal can be integrally formed with the bobbin, but is preferably formed separately from the bobbin and mounted to the bobbin. The first intermediate flange and the second intermediate flange are located in the middle of the coil device in the first axis direction, and can preferably be used as a portion to which the terminal block is mounted.

[0051] The terminal block connecting portion can be provided in the first flange and the second flange as well as in the first intermediate flange and the second intermediate flange. In this case, a longer terminal block can be easily mounted to the bobbin along the first axis across the first flange, the first intermediate flange, the second intermediate flange, and the second flange. Thus, a plurality of terminals can be arranged at a predetermined interval in the longer terminal block.

[0052] Further, the longer terminal block can be a plurality of terminal blocks that are divided along the first axis. Also, in a use in which the number of terminals is small, the terminal block connecting portion can be provided in any one or more of the first flange, the first intermediate flange, the second intermediate flange, and the second flange. Also, preferably, the terminal block connecting portion is provided on the opposite side of the coil device in the third axis direction from the surface on which the coil device is arranged (for example, the bottom surface of the housing).

[0053] In addition, the terminal block connecting portion can extend from each flange in a direction parallel to the second axis, or in a direction of the third axis, or in a direction intermediate thereto. In any case, by providing the terminal block connecting portion on the opposite side of the setting surface of the coil device (for example, the bottom surface of the housing) along the third axis, the terminal block can be made to protrude to the outside of the housing, and both heat dissipation and miniaturization of the coil device can be satisfied.

[0054] Also, the first bobbin located near the intermediate first flange can be provided with an auxiliary first flange. Also, the second bobbin located near the intermediate second flange can be provided with an auxiliary second flange. Preferably, each of these auxiliary flanges is provided with a winding slot through which a winding can pass. By providing the auxiliary flanges, it is easy to make the winding wound on the first bobbin to be wound on a portion of the second bobbin, or to make the winding wound on the second bobbin to be wound on a portion of the first bobbin, and an auxiliary circuit necessary in the circuit of a transformer or the like can be formed in the coil device, and the degree of freedom in design is improved.

[0055] Preferably, the shape of the intermediate core as viewed in the direction along the first axis is substantially the same as the shape of the first core or the second core as viewed in the direction along the first axis. By being thus configured, the same supporting protrusions or opposite protrusions as the first flange of the first core or the second flange of the second core can be formed in the intermediate core, and the same effects as those of the first core or the second core can be expected. In addition, the first outer leg or the second outer leg can also be provided with the same supporting protrusions or opposite protrusions as the first flange of the first core or the second flange of the second core. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 is a schematic perspective view of a coil device according to an embodiment of the present application.

[0057] Figure 2 is a perspective view of the main part of the housing of the coil device shown in Figure 1

[0058] Figure 3 is a cross-sectional perspective view along the line III-III shown in Figure 2

[0059] Figure 4 is an exploded perspective view of the coil device shown in Figure 2

[0060] Figure 5 is a perspective view of the bobbin showing a state before a winding is wound on the Figure 4

[0061] Figure 6 is a perspective view of the bobbin showing a state after a winding is wound on the Figure 5 ​​​​​

[0062] Figure 7 is a perspective view showing a terminal block mounted after the example of the winding of the wire around the wire reel. Figure 6

[0063] Figure 8 is a circuit diagram showing an example of the circuit of the coil device. Figure 1

[0064] BRIEF DESCRIPTION OF DRAWINGS

[0065] 10 … Coil device

[0066] 20 … Wire reel

[0067] 21 … First cylinder

[0068] 211 … Through hole

[0069] 212 … First cylinder main body

[0070] 213 … First flange

[0071] 213a … Winding groove

[0072] 214 … Intermediate first flange

[0073] 214a … Winding groove

[0074] 215 … Auxiliary first flange

[0075] 215a … Winding groove

[0076] 216 … Lower side cover

[0077] 217 … Upper side cover

[0078] 218 … First terminal block connecting portion

[0079] 22 … Second cylinder

[0080] 221 … Through hole

[0081] 222 … Second cylinder main body

[0082] 223 … Second flange

[0083] 223a … Winding groove

[0084] 224 … Intermediate second flange

[0085] 224a … Winding groove

[0086] 225 … Auxiliary second flange

[0087] 225a … Winding groove

[0088] 226 … Lower side cover​​

[0089] 227…upper side cover

[0090] 228…second terminal block connecting portion

[0091] 23…linking portion

[0092] 231…opening

[0093] 236…lower side linking cover

[0094] 237…upper side linking cover

[0095] 238…intermediate terminal block connecting portion

[0096] 30…terminal block

[0097] 30a, 30b…divided terminal block

[0098] 30c…linking member

[0099] 32…terminal

[0100] 321…lead connecting portion

[0101] 322…external connecting portion

[0102] 40…wire

[0103] 50…core

[0104] 51…first core

[0105] 511…first base

[0106] 511a…first base body

[0107] 512…first middle leg

[0108] 513…first outer leg

[0109] 514…first support protrusion

[0110] 515…first support side recess

[0111] 516…first opposite side protrusion

[0112] 517…first opposite side recess

[0113] 52…second core

[0114] 521…second base

[0115] 521a…second base body

[0116] 522…second middle leg

[0117] 523…second outer leg

[0118] 524…Second support protrusion

[0119] 525…Second support side recess

[0120] 526…Second opposite side protrusion

[0121] 527…Second opposite side recess

[0122] 53…Intermediate core

[0123] 53a…segmentation

[0124] 53b…segmentation

[0125] 53c…Matching surface

[0126] 53d…First Surface

[0127] 53e…Second Surface

[0128] 531…Intermediate base

[0129] 534…Intermediate support protrusion

[0130] 535…Middle support side recess

[0131] 536… the opposite side convex part in the middle

[0132] 537…the concave part on the opposite side in the middle

[0133] 60…heat dissipation resin

[0134] 100…shell Detailed Implementation

[0135] The present invention will now be described based on the embodiments shown in the accompanying drawings.

[0136] like Figure 1 As shown, a coil device 10 according to one embodiment of the present invention includes: a bobbin 20, a terminal block 30, one or more windings 40, a core 50, and a housing 100. Furthermore, in the accompanying drawings of this embodiment, the X-axis, Y-axis, and Z-axis are perpendicular to each other, and the X-axis is parallel to the winding core of the winding 40.

[0137] The interior of the housing 100 is filled with a heat-dissipating resin 60. The heat-dissipating resin 60 is filled such that most of the spool 20 and core 50 along the lower part of the Z-axis are embedded within the resin 60, and the winding 40 wound on the spool 20, except for the lead portion 40a, is completely embedded within the resin. The terminal block 30, mounted on the upper part of the spool 20 in the Z-axis direction, is located outside the housing 100. In this embodiment, it is located higher than the upper opening of the housing 100. However, the terminal block 30 can be located further outward than the portion of the housing 100 filled with resin 60, or it can be located lower than the upper opening of the housing 100, or it can be located outside the housing 100 along the Y-axis or X-axis.

[0138] As the resin 60, a potting resin with excellent thermal conductivity can be used, for example. The potting resin is composed of silicone resin, polyurethane resin, epoxy resin, etc., which remain soft after injection, and the longitudinal elastic modulus of the potting resin is preferably 0.1 to 100 MPa. Furthermore, the housing 100 is made of a metal with excellent cooling properties, such as aluminum.

[0139] like Figure 2 As shown, core 50 is composed of a first core 51, an intermediate core 53, and a second core 52 arranged along the X-axis. These cores 51 to 53 can be made of the same material or different materials, but are preferably made of the same magnetic material. For example, these cores 51 to 53 are composed of ferrite components, metallic magnetic components, composite components of these and resin, etc., and are manufactured by methods such as compression molding followed by firing, spray molding followed by firing, or ordinary powder pressing molding.

[0140] like Figure 4 As shown, the first core 51 has: a first base 511 connected to the base end of the first middle leg 512; and a pair of first outer legs 513 connected to the first base 511 respectively, which are located approximately parallel to each other on both sides of the first middle leg 512 along the Y-axis.

[0141] The first base 511 has: a first base body 511a, which includes a region connected to the base end of the first middle leg 512; and a pair of first support protrusions 514, which protrude downward along the Z-axis from both sides of the first base body 511a along the Y-axis and bear a portion of the load of the coil device 10. A first support side recess 515 is formed between the pair of first support protrusions 514.

[0142] Additionally, the first base 511 also has: a pair of first opposite side protrusions 516, which protrude from both sides of the first base body 511a along the Y-axis toward the first support protrusion 514 in the opposite direction along the Z-axis, and a first opposite side recess 517 is formed between the pair of first opposite side protrusions 516. Figure 3As shown, compared to the Z2 of the first opposite side protrusion 516 along the Z-axis from the first base body 511a, the Z1 of the first support protrusion 514 along the Z-axis is smaller.

[0143] like Figure 4 As shown, in this embodiment, the first outer foot 513 has a first inner recess 512a, which surrounds the first middle foot 512 from both sides in the Y-axis direction at a predetermined distance, and matches the shape of the outer peripheral surface of the first middle foot 512. The first inner recess 512a and Figure 5 The first flange 213, the intermediate first flange 214, and the auxiliary first flange 215 of the spool 20 shown are in contact with or at predetermined intervals on the outer periphery along the Y-axis on both sides. The outer peripheral surface shape of the first outer foot 513 is the same as the outer peripheral surface shape of the first base 511, which includes the protrusions 514 and 516.

[0144] The second core 52 has: a second base 521 connected to the base end of the second middle foot 522; and a pair of second outer feet 523 connected to the second base 521 respectively, located approximately parallel to each other on both sides of the second middle foot 522 along the Y-axis.

[0145] The second base 521 has: a second base body 521a, which includes a region connecting the base end of the second middle leg 522; and a pair of second support protrusions 524 (see reference). Figure 3 It protrudes downward along the Z-axis from both sides of the second base body 521a along the Y-axis and bears a portion of the load of the coil assembly 10. A second support side recess 525 is formed between a pair of second support protrusions 524.

[0146] Additionally, the second base 521 also has: a pair of second opposite side protrusions 526, which protrude from both sides of the second base body 521a along the Y-axis toward the second support protrusion in the opposite direction along the Z-axis, and a second opposite side recess 527 is formed between the pair of second opposite side protrusions 526. The protrusion height of the second support protrusion 524 from the second base body 521a along the Z-axis is smaller than the protrusion height of the second opposite side protrusions 526 from the second base body 521a. Figure 3 The relationship between the protrusion heights Z1 and Z2 shown is the same.

[0147] In this embodiment, the second outer foot 523 has a second inner recess 522a, which surrounds the second middle foot 522 from both sides in the Y-axis direction at a predetermined distance, and matches the shape of the outer peripheral surface of the second middle foot 522. The second inner recess 522a and Figure 5The outer peripheral edges of the second flange 223, the intermediate second flange 224, and the auxiliary second flange 225 on both sides along the Y-axis are in contact or arranged at a prescribed interval. The outer peripheral surface shape of the second outer leg 523 is the same as the outer peripheral surface shape of the second base 521 including the protrusions 524 and 526.

[0148] Further, in the present embodiment, the second core 52 preferably has the same structure as the first core 51, but need not necessarily be the same. For example, the lengths of the second inner leg 522 and the second outer leg 523 in the X-axis direction can also be different from the lengths of the first inner leg 512 and the first outer leg 513 in the X-axis direction. In addition, in the present embodiment, the cross-sectional shape of the inner legs 512 and 522 is a substantially elliptical shape that is long along the Y-axis, but can also be a circular shape, a polygonal shape, or another shape.

[0149] As Figure 4 shown in the present embodiment, the intermediate core 53 is a plate-shaped core that has at least two split pieces 53a and 53b, is inserted into the connecting portion of the bobbin 20 from a direction that is substantially perpendicular to the X-axis (for example, a direction along the Y-axis, but can also be another perpendicular direction), and is combined to become a plate shape.

[0150] In the present embodiment, the two split pieces 53a and 53b have their joint surfaces 53c and 53c in contact with each other to become one intermediate core 53. An adhesive can also be applied to either joint surface 53c or 53c. In the present embodiment, the joint surfaces 53c and 53c are planes that are parallel to a plane including the X-axis and the Z-axis, but are not limited thereto, and are not particularly limited as long as the joint surfaces 53c and 53c are surfaces that, when combined, enable the formation of the plate-shaped intermediate core 53. For example, the joint surfaces 53c and 53c can also be inclined at an angle other than perpendicular with respect to the Y-axis. In addition, the joint surfaces 53c and 53c can also not necessarily be a combination of planes, but can also be a combination of convex and concave surfaces.

[0151] In the present embodiment, the shape of the intermediate core 53 formed by combining the split pieces 53a and 53b, as viewed from the X-axis, is preferably the same as the shape of the first base 511 and / or the second base 521, as viewed from the X-axis. That is, the intermediate core 53 has an intermediate base 531, an intermediate support protrusion 534, an intermediate support side recess 535, an intermediate opposite side protrusion 536, and an intermediate opposite side recess 537.

[0152] Further, in the present embodiment, the thickness of the intermediate core 53 along the X-axis is not particularly limited, and is preferably thicker than the thickness of the first base 511 or the second base 521 in the X-axis direction, and is preferably about 1.5 to 2.5 times thicker. This is because the intermediate core 53 has two magnetic paths that are mainly the first core 51 and the second core 52, respectively.

[0153] AsFigure 3 As shown, the bobbin 20 includes: a first bobbin 21 wound with a winding 40, a second bobbin 22 wound with the same winding 40 or a different winding 40, and a connecting portion 23 connecting the first bobbin 21 and the second bobbin 22. The first bobbin 21, the connecting portion 23, and the second bobbin 22 are arranged coaxially along a core (central axis) X1 parallel to the X-axis. The core X1 of the first bobbin 21 is approximately parallel to the mounting surface of the coil assembly 10 (a surface approximately perpendicular to the lower Z-axis along the Z-axis). With this structure, low height and miniaturization become easy.

[0154] like Figure 5 As shown, the first cylinder 21 of the spool 20 has a first cylinder body 212 with a through hole 211 extending along the X-axis direction. Figure 3 As shown, one or more windings 40 are wound in one or two or more layers around the outer periphery of the first cylindrical body 212.

[0155] One end of the spool 20 along the X-axis direction is integrally provided with: ensuring Figure 4 The first base 511 of the first core 51 shown has an insulating first flange 213 on the inner surface of the first base 511 and the outer peripheral surface of the first cylinder 21. At the other end of the spool 20 along the X-axis, integrally provided with: ensuring... Figure 4 The inner surface of the second base 521 of the second core 52 shown and Figure 5 The second flange 223 is an insulating part of the outer peripheral surface of the second cylinder 22 shown.

[0156] In addition, such as Figure 5 As shown, at the boundary between the connecting portion 23 and the first cylinder 21, an intermediate first flange 214 is integrally provided with the spool 20 to ensure insulation between the inner side of the connecting portion 23 and the outer peripheral surface of the first cylinder 21. Similarly, at the boundary between the connecting portion 23 and the second cylinder 22, an intermediate second flange 224 is integrally provided with the spool 20 to ensure insulation between the inner side of the connecting portion 23 and the outer peripheral surface of the second cylinder 22.

[0157] Additionally, the first cylindrical body 212 located near the intermediate first flange 214 has an auxiliary first flange 215, and similarly, the second cylindrical body 222 located near the intermediate second flange 224 has an auxiliary second flange 225. These flanges 213, 223, 214, 215, 224, and 225 are substantially parallel to each other and extend from the central axis X1 of the spool 20 (refer to...). Figure 3 It is formed on the outer peripheral surface of the first cylindrical body 212 or the second cylindrical body 222 in a radially protruding manner.

[0158] In this embodiment, the intermediate first flange 214 and / or the intermediate second flange 224 are provided above the Z-axis with a feature that allows for: Figure 3The winding 40 passes through a plurality of winding grooves 214a, 224a. In addition, in the present embodiment, above the auxiliary first flange 215 and / or the auxiliary second flange 225 in the Z-axis direction, a first terminal block connecting portion 218 is provided. The first terminal block connecting portion 218 is formed so as to protrude from the upper portion of the first flange 213 in the Z-axis direction to the outside in the Y-axis direction. In addition, likewise, above the second flange 223 in the Z-axis direction, a second terminal block connecting portion 228 is provided in substantially parallel with the intermediate terminal block connecting portion 238. The second terminal block connecting portion 228 is formed so as to protrude from the upper portion of the second flange 223 in the Z-axis direction to the outside in the Y-axis direction. Figure 3 The winding 40 passes through a plurality of winding grooves 214a, 224a. In addition, in the present embodiment, above the auxiliary first flange 215 and / or the auxiliary second flange 225 in the Z-axis direction, a first terminal block connecting portion 218 is provided. The first terminal block connecting portion 218 is formed so as to protrude from the upper portion of the first flange 213 in the Z-axis direction to the outside in the Y-axis direction. In addition, likewise, above the second flange 223 in the Z-axis direction, a second terminal block connecting portion 228 is provided in substantially parallel with the intermediate terminal block connecting portion 238. The second terminal block connecting portion 228 is formed so as to protrude from the upper portion of the second flange 223 in the Z-axis direction to the outside in the Y-axis direction. Figure 3 The winding 40 passes through a plurality of winding grooves 214a, 224a. In addition, in the present embodiment, above the auxiliary first flange 215 and / or the auxiliary second flange 225 in the Z-axis direction, a first terminal block connecting portion 218 is provided. The first terminal block connecting portion 218 is formed so as to protrude from the upper portion of the first flange 213 in the Z-axis direction to the outside in the Y-axis direction. In addition, likewise, above the second flange 223 in the Z-axis direction, a second terminal block connecting portion 228 is provided in substantially parallel with the intermediate terminal block connecting portion 238. The second terminal block connecting portion 228 is formed so as to protrude from the upper portion of the second flange 223 in the Z-axis direction to the outside in the Y-axis direction.

[0159] These winding grooves 213a, 223a, 214a, 224a, 215a, 225a are formed in parallel with the opening upward in the Z-axis direction, but can also be formed with the opening outward in the radial direction. In addition, in the present embodiment, the groove depth of the winding grooves 215a, 225a is formed deeper than the groove depth of the winding grooves 213a, 223a, 214a, 224a, and the bottom of the grooves 215a, 225a can coincide with the outer peripheral surface of the first drum main body 212 or the second drum main body 222. This is because the grooves 215a, 225a are formed on the outer peripheral surface of the same drum main body 212 or 222, and thus, insulation is not required.

[0160] In the upper portion of the intermediate first flange 214 and the intermediate second flange 224 in the Z-axis direction, an intermediate terminal block connecting portion 238 is provided which links these flanges 214, 224 in a manner of being erected. The intermediate terminal block connecting portion 238 is formed so as to protrude from the upper portion of the intermediate first flange 214 and the intermediate second flange 224 in the Z-axis direction to the outside in the Y-axis direction, and in the present embodiment, has a plane parallel to the Y-axis and the X-axis.

[0161] In addition, in substantially parallel with the intermediate terminal block connecting portion 238, a first terminal block connecting portion 218 is provided in the upper portion of the first flange 213 in the Z-axis direction. The first terminal block connecting portion 218 is formed so as to protrude from the upper portion of the first flange 213 in the Z-axis direction to the outside in the Y-axis direction. In addition, likewise, in substantially parallel with the intermediate terminal block connecting portion 238, a second terminal block connecting portion 228 is provided in the upper portion of the second flange 223 in the Z-axis direction. The second terminal block connecting portion 228 is formed so as to protrude from the upper portion of the second flange 223 in the Z-axis direction to the outside in the Y-axis direction.

[0162] These terminal block connecting portions 218, 228, 238 are fitted with the mounting recesses of the terminal block 30, and the terminal block 30 is mounted and fixed to the bobbin 20. In the present embodiment, as shown in FIG. 6, the terminal block 30 is mounted to the bobbin 20 in a manner of being fitted with the terminal block connecting portions 218, 228, 238. Figure 6As shown, the terminal table 30 has: two or more divided terminal tables 30a, 30b that are separable; and a link member 30c that is engaged with the fitting portions provided below the Z-axes of the divided terminal tables 30a, 30b to integrate the divided terminal tables 30a, 30b.

[0163] As shown, each terminal 32 has: a lead wire connecting portion 321 to which lead wire portions 40a of a plurality of wire windings 40 wound around the bobbin 20 are attached; and an external connecting portion 322 connected to the lead wire connecting portion 321 inside the divided terminal table 30a or 30b. In the present embodiment, the external connecting portions 322 respectively protrude from the terminal table 30 toward the upper side of the Z-axis at a prescribed interval along the X-axis, and the lead wire connecting portions 321 respectively protrude from the terminal table 30 toward the outer side of the Y-axis at a prescribed interval along the X-axis. Figure 7

[0164] As shown, the first flange 213 of the bobbin 20 has a lower side cover 216 protruding outward from the first flange 213 along the X-axis below the Z-axis. Figure 5 As shown, the first flange 213 of the bobbin 20 has a lower side cover 216 protruding outward from the first flange 213 along the X-axis below the Z-axis. Figure 4 As shown, the first flange 213 of the bobbin 20 has a lower side cover 216 protruding outward from the first flange 213 along the X-axis below the Z-axis. Figure 3 As shown, the first flange 213 of the bobbin 20 has a lower side cover 216 protruding outward from the first flange 213 along the X-axis below the Z-axis.

[0165] As shown, the first flange 213 of the bobbin 20 has a lower side cover 216 protruding outward from the first flange 213 along the X-axis below the Z-axis. Figure 5 As shown, the first flange 213 of the bobbin 20 has a lower side cover 216 protruding outward from the first flange 213 along the X-axis below the Z-axis. Figure 4 As shown, the first flange 213 of the bobbin 20 has a lower side cover 216 protruding outward from the first flange 213 along the X-axis below the Z-axis.

[0166] As shown, the first flange 213 of the bobbin 20 has a lower side cover 216 protruding outward from the first flange 213 along the X-axis below the Z-axis.

[0167] ​The shape of the lower connecting cover 236, viewed along the X-axis, is approximately the same as that of the lower cover 216. The top surfaces of these covers 216 and 236 are flush with the bottom surfaces of the through holes 211 and 221 (see reference). Figure 3 Additionally, the shape of the upper connecting cover 237, viewed along the X-axis, is approximately the same as that of the upper cover 217. The inner surfaces of these covers 217 and 237 are located higher along the Z-axis than the upper surfaces of the through holes 211 and 221 (see reference). Figure 3 ).

[0168] like Figure 5 As shown, in the connecting portion 23, a pair of openings 231 are formed between the upper connecting cover and the lower connecting cover, respectively, connecting the inner and outer sides along the Y-axis direction. A [material / entity] is inserted into each opening 231. Figure 4 The mating surfaces 53c and the intermediate base 531 of the segmented pieces 53a and 53b shown are joined together inside the connecting portion 23 to form an intermediate core 53.

[0169] like Figure 4 As shown, the intermediate core 53 is divided into segmented pieces 53a and 53b by the segmentation surface (joining surface 53c), as follows: Figure 3 As shown, the front end face of the first middle leg 512 contacts and adheres to a first surface 53d that appears as a straight line along the X-axis of the mating surface 53c. Additionally, the front end face of the second middle leg 522 contacts and adheres to another second surface 53e that appears as a straight line along the X-axis of the mating surface 53c. The adhesive used to bond them can also be used with the adhesive used to bond the mating surfaces 53c to each other.

[0170] Alternatively, a gap for adjusting inductance or the like may be formed between the front end face of the first surface 53d and the first middle pin 512, or between the front end face of the second surface 53e and the second middle pin 522.

[0171] In this embodiment, Figure 5 The spool 20 shown is formed, for example, by spray molding. The raw material is not particularly limited; it can be made of, for example, PBT, PET, LCP, PA, or, from the viewpoint of heat resistance, phenolic resin. The segmented terminal blocks 30a and 30b, formed separately from the spool 20, can also be made of the same resin as the spool 20, but they can also be made of different resins. Preferably, the terminal 32 is formed as an insert. Furthermore... Figure 6 The connecting member 30c shown can be made of the same material as the segmented terminal blocks 30a and 30b, but it can also be made of different materials.

[0172] The material for the winding 40 is not particularly limited; for example, conductive windings such as insulated copper, copper alloys, iron, iron alloys, and CP wire can be used. The insulating material constituting the insulating sheath is not particularly limited; polyurethane, polyamide-imide, ETFE, etc., can be used.

[0173] In this embodiment, for example, such as Figure 3 As shown, one or more windings 40 are wound around the outer peripheral surfaces of the first cylinder 21 and the second cylinder 22. A portion of the winding 40 wound around the outer peripheral surface of the first cylinder 21 may also be wound around the outer peripheral surface of the second cylinder 22 located between the intermediate second flange 224 and the auxiliary second flange 225. Conversely, a portion of the winding 40 wound around the outer peripheral surface of the second cylinder 22 may also be wound around the outer peripheral surface of the first cylinder 21 located between the intermediate first flange 214 and the auxiliary first flange 215. By winding the windings 40 in this way, for example as... Figure 8 As shown, a coil device 10 can also be used to integrate multiple transformer circuits.

[0174] like Figure 4 As shown, in the coil device 10 of this embodiment, the intermediate core 53 has multiple segmented pieces 53a and 53b, which are inserted into the connecting portion 23 of the bobbin 20 from a direction substantially perpendicular to the X-axis (for example, along the Y-axis) and assembled to form a plate-shaped core. Therefore, the connecting covers 236 and 237 located between the multiple openings 231 and 231 for inserting the multiple segmented pieces 53a and 53b at the connecting portion 23 of the bobbin 20 can easily form a reinforcing structure, improving the mechanical strength of the connecting portion 23 of the bobbin 20. As a result, it is not necessary to provide a base or the like to improve the mechanical strength of the bobbin 20.

[0175] In the coil device 10 of this embodiment, it is not necessary to provide a base or the like on the coil shaft 20, therefore, as Figure 3 As shown, there is no base for the spool 20 along the heat dissipation path (downward along the Z-axis) of the heat accumulated in the first core 51, the second core 52, or the intermediate core 53. As a result, it allows... Figure 2 The lower ends of cores 51, 52, and 53 shown are along the Z-axis and Figure 1 The excellent heat dissipation of the housing 100 is achieved by direct contact with the inner bottom wall, thus improving heat dissipation. Furthermore, since a base is not required on the coil shaft 20, the coil device 10 can be easily made smaller and more compact.

[0176] In addition, such as Figure 1 As shown, the interior of the housing 100 is filled with, for example, a heat-dissipating resin 60. With this configuration, the heat generated by the winding 40, the first core 51, the second core 52 and the intermediate core 53 is dissipated through the heat-dissipating resin 60 and the housing 100, thereby improving heat dissipation.

[0177] In addition, as shown in Figure 4 The split pieces 53a, 53b are inserted into the connecting portion 23 from different directions and combined inside the connecting portion 23. With this configuration, the strength of the connecting portion 23 is easily increased, and the portion or area of the intermediate core 53 constituted by the split pieces 53a, 53b that is exposed to the outside of the bobbin 20 is easily increased, and heat dissipation is also improved.

[0178] In addition, as shown in Figure 3 The front end surface of the first middle leg 512 is in contact with (or a prescribed gap is provided) one plate-shaped first surface 53d of the intermediate core 53, and the front end surface of the second middle leg 522 is in contact with (or a prescribed gap is provided) the other plate-shaped second surface 53e of the intermediate core 53, inside the bobbin 20. Therefore, even if the intermediate core 53 is a combination of the split pieces 53a, 53b, the above-described structure can be easily adopted, and adjustment of the inductance of the coil device 10 and the like is easy.

[0179] In addition, by bonding or the like the front end surface of the first middle leg 512 to the plate-shaped first surface 53d of the intermediate core 53, the front end surface of the first middle leg 512 can be bonded to the plurality of split pieces 53a, 53b, and the joining strength thereof is also improved. Alternatively, by bonding or the like the front end surface of the second middle leg 522 to the plate-shaped second surface 53e of the intermediate core 53, the front end surface of the second middle leg 522 can be bonded to the plurality of split pieces 53a, 53b, and the joining strength thereof is also improved.

[0180] In addition, in the present embodiment, the shaft core of the first bobbin 21 and the shaft core of the second bobbin 22 are arranged in a same core shape with the connecting portion 23 interposed therebetween, and the shaft core of the first bobbin 21 is substantially parallel with respect to the mounting surface of the coil device 10. With this configuration, low height and small size are easily achieved. The mounting surface of the coil device 10 is the lower surface of the housing 100 along the Z axis in the case where the housing 100 is provided, and is the lower surface of the cores 51, 52, 53 along the Z axis in the case where the housing 100 is not provided.

[0181] In addition, in the present embodiment, as shown in Figure 4 The support protrusions 514, 524, 534 of the cores 51 to 53 protrude in the Z axis direction in a manner to bear a portion of the load of the coil device 10, and thus heat of the coil device 10 can be transmitted to the housing 100 through the support protrusions 514, 524, 534 of the cores. A cooling mechanism (for example, a heat sink or a cooling heat pipe or the like) is provided below the housing 100, and heat dissipation is further improved.

[0182] Furthermore, by forming support-side recesses 515, 525, and 535 between the support protrusions 514, 524, and 534, the heat-dissipating resin 60, for example, filled inside the housing 100, can easily enter the interior of the coil assembly 10 through these support-side recesses 515, 525, and 535, further improving heat dissipation. Additionally, lower side covers 216, 226, and 236, protruding from the flanges 213, 223, 214, and 224 of the spool 20 in the X-axis direction, can be disposed in the support-side recesses 515, 525, and 535, which can also improve insulation and retain the cores 51, 52, and 53.

[0183] In this embodiment, by reducing the protruding height of the support protrusions 514, 524, and 534, such as... Figure 3 As shown, the outer periphery of the winding 40 wound on the first cylindrical body 212 and the second cylindrical body 222 is located near, for example, close to, the cooling mechanism. Figure 1 At the bottom of the housing 100 shown, heat from the winding 40 can also be easily dissipated directly, further improving heat dissipation.

[0184] In addition, by improving Figure 4 The opposite side protrusions 516, 526, and 536, as shown, protrude upwards along the Z-axis. The opposite side recesses 517, 527, and 537 can also be formed to a greater depth, allowing this space to be used for winding the wire 40. Additionally, a [missing information - likely a device or mechanism] can be arranged in the opposite side recesses 517, 527, and 537. Figure 5 The covers 217, 227, and 237 of the flange of the spool 20 shown protruding in the X-axis direction can also improve insulation and retain the cores 51, 52, and 53.

[0185] Furthermore, in this embodiment, the intermediate first flange 214 and / or the intermediate second flange 224 may have winding grooves 214a and 224a through which the winding 40 can pass. Similarly, the first flange 213 and / or the second flange 223 may have winding grooves 213a and 223a through which the winding 40 can pass. Additionally, the auxiliary first flange 215 and / or the auxiliary second flange 225 may also have winding grooves 215a and 225a through which the winding 40 can pass.

[0186] With this configuration, the degree of freedom in wiring the winding 40 between the first coil 21 and the second coil 22 is increased, as is the degree of freedom in winding the winding 40. Therefore, the coil device 10 of this embodiment can also be used as a single transformer, or as a coil device integrating multiple transformers, making the free design of transformers or other circuits easier.

[0187] In addition, in the present embodiment, the intermediate first flange 214 and the intermediate second flange 224 are provided with a terminal base connecting portion 238 that links these flanges in a manner of being placed on top of each other. The terminal base 30 provided with the terminal 32 can also be integrally formed with the bobbin 20, but is preferably formed separately from the bobbin 20 and attached to the bobbin 20. The intermediate first flange 214 and the intermediate second flange 224 are located in the middle of the coil device 10 along the X axis and can preferably be used as a site for connecting the terminal base 30.

[0188] In addition, the first flange 213 and the second flange 223 can also be provided with a terminal base connecting portion 218, 228, together with the intermediate first flange 214 and the intermediate second flange 224. In this case, it is easy to install a longer terminal base 30 along the X axis across the first flange 213, the intermediate first flange 214, the intermediate second flange 224, and the second flange 223. Therefore, it is also possible to arrange a plurality of terminals 32 at regular intervals along the X axis in the longer terminal base 30.

[0189] Furthermore, in the present embodiment, the longer terminal base 30 is composed of a plurality of terminal bases 30a, 30b that are divided along the X axis. However, in applications in which the number of terminals 32 is small, it is also possible to provide a terminal base connecting portion 218, 228, or 238 in any one or more of the first flange 213, the intermediate first flange 214, the intermediate second flange 224, and the second flange 223. In addition, it is preferable to provide the terminal base connecting portion 218, 228, or 238 on the opposite side of the setting surface of the coil device 10 (for example, the bottom surface of the housing 100) along the Z axis.

[0190] Furthermore, the present application is not limited to the above-described embodiments and various changes can be made within the scope of the present application.

[0191] For example, Figure 6 The terminal base connecting portions 218, 228, 238 shown can extend in the direction parallel to the Y axis in addition to extending from each flange 213, 223, 214, 224 in the direction parallel to the Y axis. In any case, by providing the terminal base connecting portion 218, 228, 238 on the opposite side of the setting surface of the coil device 10 (for example, the bottom surface of the housing 100) along the Z axis, the terminal base 30 can be made to protrude outside the housing 100 and both heat dissipation and miniaturization of the coil device 10 can be satisfied.

Claims

1. A coil device, wherein there is provided: a bobbin having a first cylinder in which a wire is wound, a second cylinder in which the wire or a wire different from the wire is wound, and a joint portion that joins the first cylinder and the second cylinder; a first core having a first middle leg that is inserted into the inside of the first cylinder along a first axis; a second core having a second middle leg that is inserted into the inside of the second cylinder from the opposite side of the first middle leg along the first axis; and an intermediate core having at least two split pieces that are inserted into the joint portion from the direction of a second axis that is substantially perpendicular to the first axis and combined to be plate-shaped, a pair of openings into which the split pieces respectively enter is formed in the joint portion, the joint surfaces of the split pieces that respectively enter from the openings are combined in the inside of the joint portion, a first outer leg of the first core is in contact with or faces the split pieces with a prescribed gap, and a second outer leg of the second core is in contact with or faces the split pieces with a prescribed gap, in the inside of the bobbin, a first middle leg of the first core is in contact with or faces a first surface of the split pieces with a prescribed gap, and a second middle leg of the second core is in contact with or faces a second surface of the split pieces with a prescribed gap, the first cylinder, the second cylinder, and the joint portion are an inseparable one-piece structure, the joint portion that constitutes the bobbin has an upper joint cover and a lower joint cover that sandwich the openings from above and below, the upper joint cover and the lower joint cover join the first cylinder and the second cylinder in the direction of the first axis, the lower joint cover seamlessly continues over at least two of the split pieces in the direction of the second axis.

2. The coil device according to claim 1, wherein there is further provided: a housing that accommodates the bobbin in which the wire is wound and in which the first core, the second core, and the intermediate core are installed.

3. The coil device according to claim 2, wherein a heat-dissipating resin is filled in the inside of the housing.

4. The coil device according to any one of claims 1 to 3, wherein the axis core of the first cylinder and the axis core of the second cylinder are arranged in a same-core manner sandwiching the joint portion, the axis core of the first cylinder is substantially parallel with respect to the arrangement surface of the coil device.

5. The coil device according to any one of claims 1 to 3, wherein the first core has: a first base to which the base end of the first middle leg is connected; and a pair of first outer legs that are respectively connected to the first base in a manner of being respectively substantially parallel on both sides of the first middle leg along a second axis that is substantially perpendicular to the first axis, the second core has: a second base to which the base end of the second middle leg is connected; and a pair of second outer legs that are respectively connected to the second base in a manner of being respectively substantially parallel on both sides of the second middle leg along the second axis.

6. The coil device according to claim 5, wherein the first base has: a first base body that includes a region to which the base end of the first middle leg is connected; and a first base cover that is connected to the first base body. ​ a pair of first support protrusions protruding from both sides of the first base body along the second axis along a third axis that is substantially perpendicular to both the first axis and the second axis and bearing a portion of the load of the coil device, a first support side recess is formed between the pair of first support protrusions, the second base has: a second base body including a region to which the base end of the second middle leg is connected; and a pair of second support protrusions protruding from both sides of the second base body along the second axis along the third axis and bearing a portion of the load of the coil device, a second support side recess is formed between the pair of second support protrusions.

7. The coil device according to claim 6, wherein the first base further has: a pair of first opposite side protrusions protruding from both sides of the first base body along the second axis in the opposite direction to the first support protrusions along the third axis, a first opposite side recess is formed between the pair of first opposite side protrusions, the protrusion height of the first support protrusions from the first base body along the third axis is smaller than the protrusion height of the first opposite side protrusions from the first base body along the third axis, the second base further has: a pair of second opposite side protrusions protruding from both sides of the second base body along the second axis in the opposite direction to the second support protrusions along the third axis, a second opposite side recess is formed between the pair of second opposite side protrusions, the protrusion height of the second support protrusions from the second base body along the third axis is smaller than the protrusion height of the second opposite side protrusions from the second base body along the third axis.

8. The coil device according to claim 5, wherein a first flange that insulates the inner surface of the first base from the outer periphery of the first bobbin is provided integrally with the bobbin at one end of the bobbin in the direction of the first axis, a second flange that insulates the inner surface of the second base from the outer periphery of the second bobbin is provided integrally with the bobbin at the other end of the bobbin in the direction of the first axis, an intermediate first flange that insulates the inner side of the connecting portion from the outer periphery of the first bobbin is provided integrally with the bobbin at the boundary between the connecting portion and the first bobbin, an intermediate second flange that insulates the inner side of the connecting portion from the outer periphery of the second bobbin is provided integrally with the bobbin at the boundary between the connecting portion and the second bobbin.

9. The coil device according to claim 8, wherein a wire passage through which the wire can pass is provided in the intermediate first flange and / or the intermediate second flange.

10. The coil device according to claim 8 or 9, wherein a terminal platform connecting portion that connects the intermediate first flange and the intermediate second flange in a manner that they are placed on top of each other is provided.

11. The coil device according to claim 8, wherein an auxiliary first flange is provided in the first bobbin in the vicinity of the intermediate first flange.

12. The coil device according to any one of claims 1 to 3, wherein the shape of the intermediate core viewed in the direction along the first axis is substantially the same as the shape of the first core or the second core viewed in the direction along the first axis.

13. The coil device according to claim 1, wherein the first core has a first base to which the base end of the first middle leg is connected, the first base has a pair of first support protrusions that protrude along a third axis that is substantially perpendicular to both the first axis and the second axis, and that bear a portion of a load of the coil device, a first support side recess is formed between the pair of first support protrusions, the second core has a second base to which the base end of the second middle leg is connected, the second base has a pair of second support protrusions that protrude along the third axis, and that bear a portion of a load of the coil device, a second support side recess is formed between the pair of second support protrusions, further has a pair of first opposite side protrusions that protrude in the opposite direction to the first support protrusions along the third axis, a first opposite side recess is formed between the pair of first opposite side protrusions, the protrusion height of the first support protrusions along the third axis is smaller than the protrusion height of the first opposite side protrusions along the third axis, further has a pair of second opposite side protrusions that protrude in the opposite direction to the second support protrusions along the third axis, a second opposite side recess is formed between the pair of second opposite side protrusions, the protrusion height of the second support protrusions along the third axis is smaller than the protrusion height of the second opposite side protrusions along the third axis.

14. The coil device according to any one of claims 1 to 3, wherein the intermediate core has an intermediate base and an intermediate support protrusion, the intermediate base has a pair of intermediate support protrusions that protrude from the intermediate base in the direction of the third axis in a manner that bears a portion of a load of the coil device, an intermediate support recess is formed between the pair of intermediate support protrusions, the intermediate core further has a pair of intermediate opposite side protrusions that protrude from the intermediate core in the opposite direction to the intermediate support protrusions along the third axis, an intermediate opposite side recess is formed between the pair of intermediate opposite side protrusions, the protrusion height of the intermediate support protrusions from the intermediate core main body along the third axis is smaller than the protrusion height of the intermediate opposite side protrusions from the intermediate core main body along the third axis.

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