Winding frame and coil device

Abstract

The present invention provides a winding frame which is easy to shape and can perform high-precision multi-layer winding of a conductor and a coil device having the same. On a winding frame (20), a plurality of flange portions (24) to (27) are provided at predetermined intervals along the axial direction on the outer periphery of a winding core portion (28). A plurality of concave-convex portions (240) extending from the inner side of the end wall flange (24) toward the outer side are formed on the back side (24a) of the end wall flange (24) facing each other and on the surface (26b) of the winding wall flange (26).

Description

Technical Field

[0001] The invention relates to a winding frame and a coil device having the winding frame. Background Art

[0002] For example, as a coil device, there is a transformer shown in Patent Document 1. The transformer shown in Patent Document 1 has a winding frame having a plurality of flange portions arranged at predetermined intervals along the axial direction on the outer periphery of a winding core portion, and multiple layers of conductive wires are wound in the spaces between the flange portions. In this type of winding frame, if the intervals between the flange portions are enlarged, the conductive wires move in the spaces between the flange portions, and winding disorder is likely to occur. On the other hand, if the intervals between the flange portions are reduced, a thin portion corresponding to the portion is formed on the mold for forming the winding frame, making it difficult to form. In particular, in recent years, it has become necessary to wind thin conductive wires in multiple layers with high precision. In this case, the intervals between the flange portions must be reduced, making it more difficult to form the winding frame.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2008-66539 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] The present invention has been made in view of such actual conditions, and an object of the present invention is to provide a winding frame that is easy to shape and can perform high-precision multi-layer winding of a conducting wire, and a coil device having the same.

[0008] Technical solutions to solve problems

[0009] In order to achieve the above object, the present invention provides a winding frame, wherein a plurality of flanges are provided at predetermined intervals along the axial direction on the outer periphery of a winding core, wherein:

[0010] A plurality of projections and depressions extending from the inside of the flange portion toward the outside are formed on at least one of the back surface of one of the flange portions and the surface of the other flange portion that face each other.

[0011] In the winding frame of the present invention, a plurality of concave and convex portions extending from the inner side of the flange portion toward the outer side are formed on at least one of the back side of one flange portion and the surface of the other flange portion facing each other. Therefore, a thickness corresponding to the concave portions constituting the concave and convex portions is preliminarily given to the mold used to shape the winding frame. In this way, by giving the mold a thickness, the strength of the mold can be improved and damage to the mold can be prevented. In addition, the demolding operation becomes easy, and the winding frame can be easily formed.

[0012] Furthermore, if the conductor is wound in multiple layers in the space between adjacent flanges, the conductor cannot come into contact with the convex portions constituting the concave and convex portions and cannot be embedded in the concave portions constituting the concave and convex portions. Therefore, winding disorder is prevented and the conductor can be wound in multiple layers with high precision.

[0013] Preferably, the back side or the surface of the flange portion on which the concavoconvex is formed is divided into a plurality of sections, and a plurality of the concavoconvex facing the same direction are formed in each section. By setting such a structure, a plurality of molds corresponding to the number of sections can be demolded along the concavoconvex, and the demolding operation becomes easier.

[0014] Preferably, the extending direction of the plurality of concavo-convex portions formed in any of the sections is different from the extending direction of the plurality of concavo-convex portions formed in other sections. By setting such a structure, the plurality of models can be demolded in different directions (the extending directions of the plurality of concavo-convex portions) in the above-mentioned sections, and the demolding operation becomes easier.

[0015] Preferably, a partition extending in a direction intersecting the winding direction of the conductor wound around the outer periphery of the winding core is formed between the adjacent plurality of sections. With such a structure, even if the extension direction of the conductor and the extension direction of the concave portion constituting the concave-convex portion are substantially consistent, the conductor will not fit into the concave portion, thereby effectively preventing winding disorder and enabling high-precision multi-layer winding of the conductor.

[0016] Preferably, the plurality of concavoconvex portions are formed only on the back side of the flange portion. By setting such a structure, unlike the case where the concavoconvex portions are formed on the surface and back side of the flange portion, the bobbin can be prevented from becoming thicker in the axial direction, and a low-profile coil device can be achieved.

[0017] Preferably, a wire insertion groove extending from the inner side of the flange toward the outer side is formed on the back side or the surface of the flange, and the width of the wire insertion groove is wider than the width of the concave portion constituting the concave-convex portion. With such a structure, the lead portion of the wire can be easily led out through the wire insertion groove.

[0018] In order to achieve the above object, a coil device according to the present invention includes any one of the above-mentioned bobbins and a conductive wire wound around the outer periphery of the winding core between the adjacent flange portions.

[0019] It is also possible to have a plate-shaped coil portion formed of a plate-shaped conductor. With such a structure, when a conductor is wound in multiple layers in the space between adjacent flange portions, the connection between the coil portion formed of the conductor and the plate-shaped coil portion can be strengthened.

[0020] Preferably, the plate-shaped coil portion is insert-molded on the winding frame. With such a structure, the plate-shaped coil portion can be easily attached to the winding frame.

[0021] Preferably, the conductor is wound in multiple layers in the space between the adjacent flanges in such a manner as to be in contact with the convex portions constituting the concave and convex portions. By setting such a structure, the conductor will not be embedded in the concave portions constituting the concave and convex portions, thus effectively preventing winding disorder and enabling high-precision multi-layer winding of the conductor.

[0022] Preferably, the minimum interval between the adjacent flanges is set to an interval into which one of the conductors enters. With such a structure, when the conductors are wound in multiple layers in the space between the flanges, the conductors do not come into contact with the convex portions constituting the concave-convex portions and do not fit into the concave portions constituting the concave-convex portions. Therefore, winding disorder is effectively prevented, and the conductors can be wound in multiple layers with high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a perspective view of the transformer according to the first embodiment of the present invention.

[0024] Figure 2 yes Figure 1 An exploded perspective view of the transformer is shown.

[0025] Figure 3A It is along Figure 1 A cross-sectional view of the transformer taken along line IIIA-IIIA is shown.

[0026] Figure 3B It is along Figure 1 A cross-sectional view of the transformer showing line IIIB-IIIB.

[0027] Figure 4A yes Figure 1 The transformer shown has a perspective view of a winding frame.

[0028] Figure 4B Yes means Figure 4A A perspective view of the back side of the end bulkhead flange of the bobbin is shown.

[0029] Figure 4C Yes means Figure 4A A perspective view of the back side of the winding bulkhead flange of the winding frame is shown.

[0030] Figure 4D Yes means Figure 4A A perspective view of a modified example of the back side of the end bulkhead flange shown.

[0031] Figure 5 From another perspective Figure 4A A perspective view of the winding frame shown.

[0032] Figure 6 yes Figure 1 The circuit diagram of the transformer is shown.

[0033] Figure 7 It is a perspective view of a transformer according to a second embodiment of the present invention.

[0034] Figure 8 yes Figure 7 The transformer shown has a perspective view of a winding frame.

[0035] Fig. 9 Yes means Figure 7 A side view of the transformer is shown in the usage state. DETAILED DESCRIPTION

[0036] Hereinafter, the present invention will be described based on the embodiments shown in the drawings.

[0037] First embodiment

[0038] Figure 1 The transformer 10 as a coil device of the present embodiment shown is used, for example, for an EV (Electric Vehicle), a PHV (Plug-in Hybrid Vehicle), or an on-board charger for commuting (vehicles), or a power supply circuit for household or industrial electrical equipment, or a power supply circuit for computer equipment, etc.

[0039] like Figure 2 As shown, the transformer 10 has a winding frame (bobbin, skeleton) 20 and a core (magnetic core) 40 composed of an upper core 401 and a lower core 402. In addition, in the drawings, the X-axis, the Y-axis and the Z-axis are perpendicular to each other, and the Z-axis corresponds to the height (thickness) of the transformer 10 and is parallel to the winding axis of the coil part described later. In addition, the Y-axis is consistent with the long side direction of the base 44 of the core 401, 402. Moreover, the X-axis is consistent with the direction in which the first pedestal 22 and the second pedestal 23 of the winding frame 20 are arranged.

[0040] like Figure 4A As shown, the winding frame 20 includes a winding frame body 21 and a first pedestal 22 and a second pedestal 23 formed integrally with the winding frame body 21 in a manner that the winding frame body 21 is located on the upper part of the Z-axis direction and on the opposite sides of the X-axis direction. The winding frame body 21 of the winding frame 20 has a winding core portion 28 formed with a through hole 29 for a core pin.

[0041] End wall flanges (convex flanges) 24 and 25 are formed at both ends of the winding core 28 in the Z-axis direction. Each of the end wall flanges 24 and 25 extends to the outside of the winding core 28 substantially parallel to a plane (XY plane) including the X-axis and the Y-axis. In addition, winding wall flanges 26 and 27 extending to the outside of the winding core 28 substantially parallel to these end wall flanges 24 and 25 are integrally formed on the outer peripheral portion of the winding core 28 located between the end wall flanges 24 and 25 in the Z-axis direction.

[0042] A plurality of partition flanges 24 to 27 are provided at predetermined intervals along the axial direction on the outer periphery of the winding core 28. Hereinafter, with respect to the plurality of partition flanges 24 to 27, the surface facing upward along the Z axis is referred to as the front surface (or the upper surface), and the surface facing downward along the Z axis is referred to as the back surface (or the lower surface). Figure 3A As shown, the back side 24a of the end bulkhead flange 24 and the surface 26b of the winding bulkhead flange 26 face each other, the back side 26a of the winding bulkhead flange 26 and the surface 27b of the winding bulkhead flange 27 face each other, and the back side 27a of the winding bulkhead flange 27 and the surface 25b of the end bulkhead flange 25 face each other.

[0043] In the present embodiment, a plurality of concavo-convex portions 240 are formed on the back surface 24a of the end bulkhead flange 24 and the surface 26b of the winding bulkhead flange 26, which face each other. In addition, a plurality of concavo-convex portions 260 are formed on the back surface 26a of the winding bulkhead flange 26 and the surface 27b of the winding bulkhead flange 27, which face each other. In addition, a plurality of concavo-convex portions 270 are formed on the back surface 27a of the winding bulkhead flange 27 and the back surface 27a of the winding bulkhead flange 27, which face each other. In the present embodiment, the plurality of concavo-convex portions 240, 260, 270 are formed only on the back surfaces 24a, 26a, 27a of the bulkhead flanges 24, 26, 27.

[0044] The projections and recesses 240, 260, 270 are formed integrally with the partition wall flanges 24, 26, 27. The cross-sectional shape of the projections and recesses 240, 260, 270 along a plane perpendicular to the longitudinal direction is a wave shape in which hills and valleys are repeated alternately.

[0045] The unevenness 240 is composed of a concave portion 241 and a convex portion 242. In addition, the unevenness 260 is composed of a concave portion 261 and a convex portion 262. In addition, the unevenness 270 is composed of a concave portion 271 and a convex portion 272.

[0046] like Figure 4BAs shown, when viewed from below the Z axis (the back side of the end bulkhead flange 24), the recess 241 and the convex portion 242 are each composed of a thin and long line, extending straight from the inside of the end bulkhead flange 24 to the outside. The lengths of each of the plurality of recesses 241 along the long side direction are not necessarily uniform, and differ depending on the formation position. The same is true for the lengths of each of the plurality of convex portions 242 along the long side direction. In addition, in the present embodiment, "from the inside to the outside" means from the inside to the outside along the radial direction (radial direction), chordal direction, or direction parallel to the wiring direction of the end bulkhead flange 24.

[0047] The recessed portion 241 and the convex portion 242 are formed entirely except for the region where the partition portion 243 and the wire insertion groove 244 described later are formed on the back surface 24a of the end partition flange 24. The depth of the recessed portion 241 or the height of the convex portion 242 along the Z axis is preferably less than 4 times and more than 0.1 times the wire diameter of the wire 33 wound around the outer periphery of the winding core portion 28, and more preferably less than 2 times and more than 0.3 times.

[0048] The widths of the concave portion 241 and the convex portion 242 along the direction perpendicular to the long side direction are substantially equal, and the concave portion 241 and the convex portion 242 are repeatedly formed at a certain pitch. Figure 3A As shown, each of the concave portion 241 and the convex portion 242 has a cross-sectional shape along a plane perpendicular to the long-side direction, which is a rectangular or trapezoidal shape with rounded corners.

[0049] The minimum interval between the adjacent end wall flange 24 and the winding wall flange 26, that is, the interval between the protrusion 242 and the surface 26b of the winding wall flange 26, is set to an interval for one wire 33 to enter (same as the wire diameter of the wire 33). The same is true for the interval between the protrusion 262 and the surface 27b of the winding wall flange 27 and the interval between the protrusion 272 and the surface 25b of the winding wall flange 25.

[0050] Therefore, when the conductor 33 is wound around the outer periphery of the winding core 28, the conductor 33 is wound in multiple layers (in multiple layers in the radial direction) in the space between the end partition wall flange 24 and the winding partition wall flange 26 so that the projections 242 constituting the projections and depressions 240 are in contact with each other.

[0051] like Figure 4B As shown, a plurality of (three) partitions 243 are formed on the back surface 24a of the end bulkhead flange 24. The partition 243 is formed in an elongated rectangular shape and is integrally formed with the end bulkhead flange 24. The height of the partition 243 along the Z-axis direction is substantially equal to the height of the convex portion 242 along the Z-axis direction, and the partition 243 and the convex portion 242 are flush.

[0052] The partition 243 extends straight from the inside of the end partition flange 24 toward the outside (in the radial direction). The inner ends of the plurality of concave and convex 240 are connected to both ends of a partition 243 in a direction perpendicular to the long side direction. As described later, when the conductor 33 is wound around the outer periphery of the winding core 28 and the conductor 33 is wound in multiple layers in the space between the end partition flange 24 and the winding partition flange 26, the partition 243 extends in a direction intersecting the winding direction of the conductor 33.

[0053] The inner end of the partition 243 is connected to the outer peripheral surface of the winding core 28, and the outer end of the partition 243 is connected to the outer peripheral surface of the end partition flange 24. In the example shown in the figure, the outer end and the inner end of the partition 243 are continuously connected without interruption.

[0054] The width of the partition 243 in the direction perpendicular to the long side direction is greater than the width of the concave portion 241 or the convex portion 242 described later in the direction perpendicular to the long side direction, but there is no particular limitation. For example, the width of the partition 243 may be substantially zero, or the partition 243 may be omitted.

[0055] The back side 24a of the winding partition flange 24 having the projections and depressions 240 is divided into three sections, namely, a first section 24a1, a second section 24a2, and a third section 24a3 by the three partitions 243. In other words, each partition 243 is formed between adjacent sections 24a1, 24a2, and 24a3.

[0056] The plurality of concavo-convex portions 240 are formed inside each of the first section 24a1 , the second section 24a2 , and the third section 24a3 , and a collection of the plurality of concavo-convex portions 240 facing the same direction is formed in each of the sections 24a1 , 24a2 , and 24a3 .

[0057] The plurality of concavo-convex portions 240 formed in the first section 24a1 extend in the X-axis direction and face the same direction (X-axis direction). The plurality of concavo-convex portions 240 formed in the second section 24a2 extend in the Y-axis direction and face the same direction (Y-axis direction). The plurality of concavo-convex portions 240 formed in the third section 24a3 extend in the X-axis direction and face the same direction (X-axis direction).

[0058] In this way, on the back side 24a of the end partition flange 24, multiple protrusions and depressions 240 extend continuously in the longitudinal and transverse directions, and the extension direction of the multiple protrusions and depressions 240 formed in the first section 24a1 and the third section 24a3 is approximately 90 degrees different from the extension direction of the multiple protrusions and depressions 240 formed in the second section 24a2.

[0059] On the inner side of sections 24a1, 24a2, and 24a3, a portion of the plurality of projections and recesses 240 extends from the partition portion 243 toward the outer side of the end partition flange 24, and on the other hand, other portions of the plurality of projections and recesses 240 extend from the outer peripheral surface of the winding core portion 28 toward the outer side of the end partition flange 24.

[0060] Since each section 24a1, 24a2, 24a3 is partitioned by the plurality of partitions 243, the plurality of concavo-convex 240 formed in each section 24a1, 24a2, 24a3 is not continuous with the plurality of concavo-convex 240 formed in other sections 24a1, 24a2, 24a3.

[0061] A wire insertion groove 244 extending from the inside to the outside is formed on the back side 24a of the end bulkhead flange 24. The wire insertion groove 244 is formed in the first section 24a1, and the extension direction of the wire insertion groove 244 is the same as the extension direction of the concave-convex 240 formed in the first section 24a1. The wire insertion groove 244 is formed on one side of the first pedestal 22 where the end bulkhead flange 24 is arranged. In addition, since a lead notch 245 (see Figure 4B ), so a portion of the wire insertion groove 244 is notched along the X-axis direction according to the lead notch 245.

[0062] When viewed from the lower side of the Z axis (the back side of the end wall flange 24), the wire insertion groove 244 is formed in a wide rectangular shape, and has a shape that further widens the concave portion 241 constituting the concave-convex 240. The wire insertion groove 244 extends straight from the outer peripheral surface of the winding core portion 28 to the outer peripheral surface of the end wall flange 24 in a manner that the lead portion 333 of the wire 33 described later can be inserted. The groove width of the wire insertion groove 244 is wider than the groove width of the concave portion 241, preferably 2 to 6 times.

[0063] like Figure 4C As shown, the concavoconvex 260 has the same structure as the concavoconvex 240, and the partition 263 has the same structure as the partition 243. In addition, the structures of the second section 26a2 and the third section 26a3 of the winding bulkhead flange 26 are the same as the structures of the second section 24a2 and the third section 24a3 of the end bulkhead flange 24. The structure of the first section 26a1 of the winding bulkhead flange 26 is the same as the structure of the first section 24a1 of the end bulkhead flange 24, except that a structure corresponding to the wire insertion groove 244 is not formed.

[0064] In addition, detailed illustration is omitted, but Figure 3A The structure of the back side 27a of the winding bulkhead flange 27 is the same as the structure of the back side 26a of the winding bulkhead flange 26. That is, three partitions 273 having the same structure as the partitions 263 are formed on the back side 27a of the winding bulkhead flange 27 (see Figure 4C), and the back side 27a is divided into three sections 27a1 to 27a3 (sections 27a1 and 27a3 are not shown) by three partitions 273. In addition, a plurality of concave-convex portions 270 having the same structure as the plurality of concave-convex portions 260 are formed in sections 27a1 to 27a3. The concave portions 271 and the convex portions 272 constituting the concave-convex portions 270 have the same structure as the concave portions 261 and the convex portions 262 constituting the concave-convex portions 260.

[0065] like Figure 3A As shown, a first area groove (space) S1 is formed between the end partition wall flange 24 located above in the Z-axis direction and the winding partition wall flange 26, a second area groove (space) S2 is formed between the winding partition wall flange 26 and the winding partition wall flange 27, and a third area groove (space) S3 is formed between the end partition wall flange 25 located below in the Z-axis direction and the winding partition wall flange 27.

[0066] The groove depth (length relative to the winding axis radial direction) of each regional groove S1 to S3 is set to a depth that allows one or more turns (multiple layers) of the conductor 33 to enter, preferably a depth that allows 3 to 15 turns of the conductor 33 to be wound.

[0067] In this embodiment, the conductive wire 33 is wound in multiple layers in the regional grooves S1, S2, and S3 between the adjacent flanges 24, 26, 27, and 25 so as to be in contact with the convex portions 242, 262, and 272 constituting the concavo-convex portions 240, 260, and 270. The groove depth of each of the regional grooves S1 to S3 corresponds to the radial length of the adjacent flanges 24 to 27 from the outer peripheral surface of the winding core 28, and is preferably all the same, but may be different.

[0068] like Figure 4A As shown, a lead notch 245 is formed at one end in the X-axis direction of the end partition flange 24 where the first pedestal 22 is arranged. The lead notch 245 is formed from the outer peripheral surface to the inner peripheral surface of the end partition flange 24, and the notch depth of the lead notch 245 is the depth reaching the outer peripheral surface of the winding core 28.

[0069] The lead wire notch 245 is used to wrap the lead wire around the Figure 3B The lead portion 333, one end of the wire 33 wound inside the first zone slot S1, guides upward in the Z-axis direction. That is, one wire 33 can pass through the lead notch 245, pass through the zone slot S1, and be wound around the zone slot S1 with a plurality of predetermined turns.

[0070] Normal winding (aligned winding) is preferred as the winding method, but other winding methods may be used. By winding the conductor 33 with a predetermined number of turns around the winding core 28 located between each of the adjacent flanges 24 to 27, multiple layers of the conductor 33 are respectively wound in the area groove (space) S1 between each of the adjacent flanges 24 and 26, the area groove (space) S2 between each of the adjacent flanges 26 and 27, and the area groove (space) S3 between each of the adjacent flanges 27 and 25, thereby forming a Figure 2 The wire coil portion 331 is shown.

[0071] The wire 33 may be a single wire or a twisted wire such as a litz wire. The wire diameter of the wire 33 is not particularly limited, but is preferably in the range of 1.0 to 4.0 mm. The wire 33 is a conductive wire such as a metal wire, but may be an insulating coated wire.

[0072] Furthermore, the first flat coil portion 311 of the first flat conductor 31 is embedded in the winding partition wall flange 26 , and the second flat coil portion 321 of the second flat conductor 32 is embedded in the winding partition wall flange 27 .

[0073] like Figure 2 As shown, the first flat coil portion 311 of the first flat conductor 31 has a circular plate shape of approximately one turn, and this portion is buried inside the winding flange 26. In addition, similarly, the second flat coil portion 321 of the second flat conductor 32 has a circular plate shape of approximately one turn, and this portion is buried inside the winding flange 27.

[0074] First flat lead portions 312 and 313 are formed at both ends of the first flat coil portion 311. Each of the first flat lead portions 312 and 313 is formed by protruding from the extended flange portion 26e of the winding wall flange 26 on the second pedestal 23 side of the winding frame 20 and being bent upwardly toward the Z axis. In addition, second flat lead portions 322 and 323 are formed at both ends of the second flat coil portion 321. Each of the second flat lead portions 322 and 323 is formed by protruding from the extended flange portion 27e of the winding wall flange 27 on the second pedestal 23 side of the winding frame 20 and being bent upwardly toward the Z axis.

[0075] The extended flanges 26e and 27e are portions that protrude further outward in the X-axis direction than the outer peripheries of the winding bulkhead flanges 26 and 27, and are formed at the other end in the X-axis direction of the winding bulkhead flanges 26 and 27 where the second pedestal 23 is disposed (see Figure 4A ).

[0076] The position where the first flat lead portion 312 flies out from the winding adjacent flange 26 and the position where the second flat lead portion 322 flies out from the winding adjacent flange 27 are offset in the Y-axis direction, and in this embodiment, are arranged to be located on opposite sides along the Y-axis direction of the winding frame 20. In addition, the position where the other first flat lead portion 313 flies out from the winding adjacent flange 26 and the position where the other second flat lead portion 323 flies out from the winding adjacent flange 27 are consistent in the Y-axis direction.

[0077] However, if Figure 3B As shown, in this embodiment, the position where the first flat lead portion 313 is bent upward toward the Z axis and the position where the second flat lead portion 323 is bent upward toward the Z axis are offset in the X-axis direction. That is, the position where the second flat lead portion 323 is bent upward toward the Z axis is set to be closer to the outside than the position where the first flat lead portion 313 is bent upward toward the Z axis in the X-axis direction. The lead portions 313 and 323 that are aligned in the Y-axis direction may also be arranged, for example, Fig. 9 The circuit board 100 shown is electrically connected to an external circuit.

[0078] In this embodiment, the Figure 2 The first flat conductor 31 and the second flat conductor 32 are formed, and these flat coil portions 311 and 321 are arranged inside the mold, and the winding frame 20 is injection molded (insert molded), etc., so that they can be integrated with the winding frame 20. The bending forming of each lead portion 312, 313, 322, 323 can be performed after the insert molding, or it can be pre-processed before.

[0079] In order to facilitate the winding operation of the wire 33 of the bobbin 20 onto the winding core 28 , it is preferable to perform bending of the lead portions 312 , 313 , 322 , and 323 integrated with the bobbin 20 after the winding operation of the wire 33 is completed.

[0080] In this embodiment, the flat conductors 31 and 32 are made of a plate-shaped conductor, such as a metal such as copper, aluminum, tin, nickel, or a conductive plate such as an alloy thereof. The thickness of the flat conductors 31 and 32 is not particularly limited, but is preferably 0.3 to 0.8 mm. The surface of the flat conductors 31 and 32, especially the surface of the lead portions 312, 313, 322, and 323, may be subjected to electroplating or surface roughening treatment in order to improve the adhesion with the bonding parts such as solder.

[0081] like Figure 6 As shown, in this embodiment, the planar coil portions 311 and 321 are primary coil portions, and the wire coil portion 331 is a secondary coil portion. However, the relationship between the primary coil portion and the secondary coil portion may be reversed.

[0082] like Figure 4A As shown, the first pedestal 22 integrally formed with the upper surface in the Z-axis direction of the end partition flange 24 of the winding frame 20 has a side wall portion 221. A pair of first lead-out passages 222, 222 extending to the outside in the Y-axis direction and a pair of second lead-out passages 224, 224 extending to the outside in the X-axis direction are formed on the back side of the side wall portion 221 (outside in the X-axis direction of the winding frame 20). The first lead-out passage 222 and the second lead-out passage 224 are connected, and each lead-out passage 222, 224 forms a substantially L-shaped passage.

[0083] A pair of side convex portions 223, 223 protruding from the upper surface of the first pedestal 22 toward the upper side of the Z axis are formed on the back side of the side wall portion 221. The pair of side convex portions 223, 223 are formed at both ends of the first pedestal 22 in the Y axis direction so as to be located on opposite sides of each other in the Y axis direction. The first lead-out passage 222 is formed so as to be sandwiched between the side convex portions 223 and the side wall portion 221.

[0084] A pair of central protrusions 225, 225 protruding upward in the Z axis from the upper surface of the first pedestal 22 is formed between the side protrusions 223 and the other side protrusions 223. The pair of central protrusions 225, 225 are formed at the substantially central portion of the first pedestal 22 in the Y axis direction so as to sandwich the lead wire notch 245 and be located on opposite sides to each other. The second lead-out passage 224 is formed between the central protrusion 225 and the side protrusions 223 so as to be sandwiched therebetween.

[0085] Furthermore, the side wall portion 221 , the side protrusions 223 , and the central protrusion 225 are formed integrally with the bobbin body 21 .

[0086] like Figure 5 As shown in the figure, in each side convex part 223, the terminal 35 is insert-molded in such a manner that the middle part of the terminal 35 is respectively embedded. The wire connection part 351 of the terminal 35 protrudes in the Y-axis direction from the end surface of the side convex part 223 in the Y-axis direction. In addition, the external connection part 352 of the terminal 35 flies out from the upper surface of the side convex part 223 in the upper direction of the Z-axis direction. The middle part of the L-shaped connecting part 351 and the external connection part 352 of the connecting terminal 35 is embedded in the inside of the side convex part 223 and integrated.

[0087] In this embodiment, the terminal 35 is composed of a substantially L-shaped conductive pin as a whole, but may also be composed of a substantially L-shaped conductive plate. The material of the terminal 35 is not particularly limited as long as it is a conductive material, and examples thereof include copper and copper alloys.

[0088] The wire lead portions 332 and 333 are connected to the wire connection portions 351 and 351, respectively. The wire lead portions 332 and 333 constitute Figure 2The wire coil portion 331 shown has both ends of the wire 33 .

[0089] The wire lead portion 332 led out through the second lead passage 224 and the first lead passage 222 is connected to the wire connection portion 351 of the terminal 35 arranged on one side of the Y axis. On the other hand, the wire lead portion 333 led out through the lead notch 245 and the first lead passage 222 is connected to the wire connection portion 351 of the terminal 35 arranged on the other side of the Y axis.

[0090] The wire connection portions 351 and 352 to which the wire lead portions 332 and 333 are respectively bundled may be joined by solder, laser, or other joining methods such as resistance welding.

[0091] like Figure 4A As shown, on the second pedestal 23 located on the opposite side of the first pedestal 22 in the X-axis direction from the end partition flange 24, a side wall portion 231 having a shape similar to that of the side wall portion 221 of the first pedestal 22 is integrally formed so as to protrude in the Z-axis direction. Since the base 44 of the upper core 401 is arranged between the side wall portions 221 and 231, these side wall portions 221 and 231 have a shape that can easily clamp the center portion of the base 44 in the Y-axis direction.

[0092] The winding frame 20 is made of plastic such as PPS, PET, PBT, LCP, nylon, etc., but may also be made of other insulating components. However, in the present embodiment, the winding frame 20 is preferably made of plastic having a thermal conductivity of 1 W / m·K or more, such as PPS, nylon, etc.

[0093] like Figure 2 As shown, in this embodiment, the cores 401 and 402 have the same shape and have an E-shaped cross section in the ZY cross section, forming a so-called E-shaped core. Figure 2 In the embodiment shown, for example, the cores 401 and 402 may be formed as one body, or the cores 401 and 402 may be divided into a plurality of parts.

[0094] The cores 401 and 402 have a base 44 extending in the Y-axis direction, a pair of side legs 48 and 48 protruding from both ends of the base 44 in the Y-axis direction in the Z-axis direction, and a middle leg 46 protruding from the center in the Y-axis direction between these side legs 48 and 48 in the Z-axis direction.

[0095] The middle leg portion 46 is inserted into the core leg through hole 29 of the winding frame 20 from the upper and lower sides in the Z-axis direction. Figure 3AAs shown, the front ends of the middle legs 46, 46 may be in contact with each other or face each other with a predetermined gap in between inside the core leg through hole 29 of the winding frame 20. In addition, by forming the gap, the leakage characteristics can be adjusted according to the width of the gap.

[0096] like Figure 2 As shown, the middle legs 46, 46 have a substantially cylindrical shape in a manner consistent with the inner peripheral surface shape of the core leg through hole 29, but this shape is not particularly limited and may be changed according to the shape of the core leg through hole 29. In addition, the side legs 48, 48 have an inner concave curved surface shape that matches the outer peripheral surface shape of the bobbin body 21, and the outer surface thereof has a plane parallel to the XZ plane (a plane including the X-axis and the Z-axis). In this embodiment, the material of each core 401, 402 can be a soft magnetic material such as metal or ferrite, but is not particularly limited.

[0097] The transformer 10 of this embodiment is assembled Figure 2 The components shown in the figure are manufactured by winding the conductor 33 around the winding core 28 of the winding frame 20. Figure 2 An example of a method for manufacturing the transformer 10 will be described.

[0098] In manufacturing the transformer 10, first, the winding frame 20 is formed by closing the mold and filling the mold cavity with an insulating material such as resin. In this embodiment, inside the mold cavity, the slide-shaped mold for forming the areas corresponding to the area slots S1 to S3 is separated into three. In addition, each of the three separated slide-shaped molds has a shape, size, or orientation that is different from the area slots S1 to S3. Figure 3A The multiple concave-convexities 240, 260, and 270 shown in the figure correspond to the multiple concave-convexities.

[0099] When the mold cavity is filled with insulating material, the partition flanges 24, 26, 27 are formed, and the partitions 243, 263, 273 are formed at the positions corresponding to the slide-shaped mold on the back sides 24a, 26a, 27a of the partition flanges 24, 26, 27. Thus, the back sides 24a, 26a, 27a are divided into three sections 24a1 to 24a3, 26a1 to 26a3, and 27a1 to 27a3.

[0100] At the same time, each of the sections 24a1 to 24a3 formed on the back surface 24a has a plurality of concavo-convex portions 240 (concave portions 241 and convex portions 242) corresponding to the plurality of concavo-convex portions formed on each of the slide-shaped molds. In addition, each of the sections 26a1 to 26a3 has a plurality of concavo-convex portions 260 (concave portions 261 and convex portions 262) corresponding to the plurality of concavo-convex portions formed on each of the slide-shaped molds. In addition, each of the sections 27a1 to 27a3 has a plurality of concavo-convex portions 270 (concave portions 271 and convex portions 272) corresponding to the plurality of concavo-convex portions formed on each of the slide-shaped molds.

[0101] As described above, on the bobbin 20, the flat coil portions 311, 321 of the flat conductors 31, 32 are integrated by insert molding in a manner buried inside the respective adjacent flanges 26, 27. In addition, the intermediate portions of the terminals 35, 35 are integrated with the first pedestal 22 of the bobbin 20 by insert molding in a buried manner.

[0102] Next, the wire coil portion 331 is formed. Specifically, first, the wire 33 is inserted through the Figure 4A The lead wire shown is led out to the area slot S1 (see Figure 3A ), and is wound around the outer periphery of the winding core 28 as it is by normal winding. In the area groove S1, the conductor 33 is wound in multiple layers to the vicinity of the outer periphery of the partition wall flanges 24 and 26.

[0103] Then, the lead wire 33 is locked to the lead locking portion 26c formed on the outer peripheral surface of the winding wall flange 26, and is led out to the lower side of the Z axis in a manner that straddles the outer peripheral surface of the winding wall flange 26. Furthermore, the lead wire 33 is bent in the X-axis direction and passed through the lead wire locking portion 26c. Figure 4C The wire insertion groove 264 shown in FIG. Figure 3A ) is guided inside the winding core 28 and is again wound around the outer periphery of the winding core 28 by normal winding. In the area groove S2, the conductor 33 is wound in multiple layers to the vicinity of the outer periphery of the adjacent flanges 26 and 27.

[0104] Then, the lead wire 33 is locked to the lead wire locking portion 27c formed on the outer peripheral surface of the winding wall flange 27, and is led out to the lower side of the Z axis in a manner that straddles the outer peripheral surface of the winding wall flange 27. Furthermore, the lead wire 33 is bent in the X-axis direction and passed through the lead wire locking portion 27c formed on the outer peripheral surface of the winding wall flange 27. Figure 4C The same insertion groove (not shown) as the wire insertion groove 264 shown in FIG. Figure 3A ) is guided inside the winding core 28 and is again wound around the outer periphery of the winding core 28 by normal winding. In the area groove S3, the conductor 33 is wound in multiple layers to the vicinity of the outer periphery of the adjacent flanges 27 and 25.

[0105] Next, if Figure 5As shown, the wire 33 is hooked to the lead hook portion 27d formed on the outer peripheral surface of the winding bulkhead flange 27 and the lead hook portion 26d formed on the outer peripheral surface of the winding bulkhead flange 26, and is led out to the upper side of the Z axis in a manner spanning the outer peripheral surfaces of the winding bulkhead flanges 26 and 27.

[0106] The lead wire portion 332 formed at one end of the lead wire 33 passes through the second lead-out passage 224 and is led out to the inside of the X-axis, and passes through the first lead-out passage 222 and is led out toward the outside of the Y-axis, and is tied to the lead wire connection portion 351 of one terminal 35, and is connected by, for example, soldering. The lead wire portion 333 formed at the other end of the lead wire 33 passes through the first lead-out passage 222 and is led out toward the outside of the Y-axis, and is tied to the lead wire connection portion 351 of the other terminal 35, and is connected by, for example, soldering. In addition, there is no particular limitation on the lead wire 33, but it is preferable to use a stranded wire or the like. In addition, the winding direction of the lead wire 33 is not limited to the winding direction from the upper side to the lower side as described above, and may be a winding direction from the lower side to the upper side.

[0107] After the winding operation, the flat lead portions 312 , 313 , 323 , 322 of the flat conductors 31 , 32 are bent upward along the Z axis as necessary.

[0108] Next, if Figure 3A As shown, the cores 401 and 402 are installed from the upper and lower directions of the Z-axis direction. That is, the front ends of the middle legs 46 and 46 of the cores 401 and 402 are joined to each other, and the front ends of the side legs 48 and 48 are joined to each other. In addition, a gap may be maintained between the front ends of the middle legs 46 and 46.

[0109] like Fig. 9 As shown, the transformer 10 manufactured as above is mounted on the circuit substrate 100 in such a manner that the external connection parts 352, 352 of the pair of terminals 35, the first flat lead parts 312, 313, and the second flat lead parts 322, 323 penetrate the predetermined positions of the circuit substrate 100, and the winding frame 20 (the next wall flanges 24 to 27) and the circuit substrate 100 are parallel. In addition, the side opposite to the side of the circuit substrate 100 on which the transformer 10 is provided is fixed to the frame 102.

[0110] In the winding frame 20 of the present embodiment, a plurality of concave-convex 240, 260, 270 extending from the inner side of the flange portion 24, 26, 27 to the outer side are formed on the back side 24a, 26a, 27a of the adjacent flanges 24, 26, 27. Therefore, the thickness corresponding to the concave portions 241, 261, 271 constituting the concave-convex 240, 260, 270 is given to the slide-shaped mold for forming the winding frame 20 in advance. In this way, by giving the mold a thickness, the strength of the slide-shaped mold can be improved and the damage of the mold can be prevented. In addition, the demolding operation becomes easy, and the winding frame 20 can be easily formed.

[0111] Furthermore, if the conductor 33 is wound in multiple layers in the area grooves (spaces) S1, S2, and S3 between the adjacent adjacent flanges 24 to 27, the conductor 33 does not come into contact with the convex portions 242, 262, and 272 constituting the concave and convex portions 240, 260, and 270 and does not fit into the concave portions 241, 261, and 271 constituting the concave and convex portions 240, 260, and 270. Therefore, winding disorder is prevented, and the conductor 33 can be wound in multiple layers with high precision.

[0112] In addition, the back surfaces 24a, 26a, 27a of the next-wall flanges 24, 26, 27 formed with the concavoconvexities 240, 260, 270 are divided into a plurality of sections 24a1 to 24a3, 26a1 to 26a3, 27a1 to 27a3, and a plurality of concavoconvexities 240, 260, 270 facing the same direction are formed in each section 24a1 to 24a3, 26a1 to 26a3, 27a1 to 27a3. With such a structure, a plurality of molds (slide-shaped molds) corresponding to the number of sections can be demolded along the concavoconvexities, and the demolding operation becomes easier.

[0113] In addition, if Figure 4B As shown, for example, the extending direction of the plurality of concavo-convex 240 formed in the section 24a2 is different from the extending direction of the plurality of concavo-convex 240 formed in the other sections 24a1 and 24a3. By setting such a structure, in each of the above sections 24a1 to 24a3, the plurality of molds can be demolded in different directions (the extending direction of the plurality of concavo-convex 240 formed in the section 24a2 and the extending direction of the plurality of concavo-convex 240 formed in the sections 24a1 and 24a3), and the demolding operation becomes easier.

[0114] In addition, in multiple adjacent segments (in Figure 4BIn the embodiment, a partition 243 extending in a direction intersecting the winding direction of the conductor 33 wound around the outer periphery of the winding core 28 is formed between the sections 24a1, 24a2, and 24a3. With such a structure, the extending direction of the conductor 33 and the extending direction of the recess 241 constituting the recesses and protrusions 240 are substantially consistent, and the conductor 33 does not fit into the recess 241, thereby effectively preventing winding disorder and enabling high-precision multi-layer winding of the conductor 33.

[0115] In addition, the plurality of concavo-convex portions 240, 260, 270 are formed only on the back surfaces 24a, 26a, 27a of the adjacent flanges 24, 26, 27. By setting such a structure, unlike the case where the concavo-convex portions 240, 260, 270 are formed on the surfaces 24b, 26b, 27b and the back surfaces 24a, 26a, 27a of the flanges 24, 26, 27, the winding frame 20 can be prevented from being deformed in the axial direction, and the transformer 10 can be made low-profile.

[0116] In addition, a wire insertion groove 245 is formed on the back surface 24a, 26a, 27a of the adjacent flanges 24, 26, 27, and the width of the wire insertion groove 245 in the direction perpendicular to the long side direction is wider than the width of the recess 241 in the direction perpendicular to the long side direction. With such a structure, the lead portion 333 of the wire 33 can be passed through the wire insertion groove 245 and easily led out.

[0117] In addition, the transformer 10 has a first flat coil portion 311 and a second flat coil portion 321 formed of a plate-shaped conductor. With such a structure, when the conductor 33 is wound in multiple layers in the area grooves (spaces) S1, S2, and S3 between the flanges 24 to 27, the connection between the coil portion 33 formed of the conductor 33 and the first flat coil portion 311 and the second flat coil portion 321 can be strengthened.

[0118] In addition, the first planar coil portion 311 and the second planar coil portion 321 are insert-molded in the bobbin 20. With such a structure, the first planar coil portion 311 and the second planar coil portion 321 can be easily attached to the bobbin 20.

[0119] The conductor 33 is wound in multiple layers in the area grooves (spaces) S1, S2, and S3 between the adjacent flanges 24 to 27 so as to be in contact with the protrusions 242. With such a structure, the conductor 33 does not fit into the recesses 241, winding disorder is effectively prevented, and the conductor 33 can be wound in multiple layers with high precision.

[0120] In addition, the minimum interval between the adjacent adjacent flanges 24 to 27 is set to an interval into which one conductor 33 enters. With such a structure, when the conductor 33 is wound in multiple layers in the area grooves (spaces) S1, S2, and S3 between the adjacent flanges 24 to 27, the conductor 33 does not come into contact with the convex portion 242 and is embedded in the concave portion 241. Therefore, winding disorder is effectively prevented, and the conductor 33 can be wound in multiple layers with high precision.

[0121] Second embodiment

[0122] At once Figure 7 to Figure 9 As for the transformer 10A as a coil device of the present embodiment shown, the interior of the winding frame 20A is common to the transformer 10 of the first embodiment, and the main components are common, but the winding axis direction of the coil is different, and the external structure of the winding frame 20A is different. Hereinafter, the parts different from the transformer 10 of the first embodiment will be described in detail, and the description of some common parts will be omitted. In addition, in the drawings, the common symbols are marked for the parts common to the first embodiment, and the description of some of them is also omitted.

[0123] like Figure 7 As shown in FIG. 1 , the transformer 10A includes a winding frame 20A, and the winding frame 20A includes a winding frame body 21A. A first pedestal 22A is formed on the winding frame body 21A instead of the first pedestal 22 of the first embodiment. Figure 8 As shown in the figure, a pair of side convex parts 223A are formed on the first pedestal 22A instead of the pair of side convex parts 223 of the first embodiment. In each side convex part 223A, the terminal 35 is insert-molded in an embedded manner. In this embodiment, the wire connecting part 351 of the terminal 35 flies out from the upper surface of the side convex part 223A in the upper direction of the Z axis direction. In addition, the external connecting part 352 of the terminal 35 protrudes from the end surface of the side convex part 223A in the X axis direction in the X axis direction.

[0124] Extended flanges 26e and 27e are formed at one end in the X-axis direction of the winding partition flanges 26 and 27 where the first pedestal 22A is arranged. In this embodiment, the arrangement of the extended flanges 26e and 27e is opposite to that of the first embodiment.

[0125] The first flat lead portions 312A and 313A of the first flat conductor 31A protrude from the extended flange portion 26e of the winding partition flange 26 on the first pedestal 22A side of the bobbin 20A. However, the first flat lead portions 312A and 313A of this embodiment are different from the first flat lead portions 312 and 313 of the first embodiment in that they are not bent.

[0126] In addition, the second flat lead portions 322A and 323A of the second flat conductor 32A fly outward from the extended flange portion 27e of the winding partition flange 27 on the first pedestal 22A side of the bobbin 20A. However, the second flat lead portions 322A and 323A of this embodiment are different from the second flat lead portions 322 and 323 of the first embodiment in that they are not bent and formed.

[0127] In this embodiment, the same effect as in the first embodiment is obtained. In addition, in this embodiment, the external connection parts 352, 352 of a pair of terminals 35, the first flat lead parts 312A, 313A, and the second flat lead parts 322A, 323A protrude in the same direction (below the Z axis). Therefore, when the external connection parts 352, 352 of a pair of terminals 35, the first flat lead parts 312A, 313A, and the second flat lead parts 322A, 323A are passed through the specified position of the circuit substrate and the transformer 10A is installed on the circuit substrate, the winding frame 20 (next wall flanges 24 to 27) and the circuit substrate are perpendicular. That is, in this embodiment, the transformer 10A can be set longitudinally relative to the circuit substrate, and installation can be performed in a narrow space that is effectively utilized.

[0128] In addition, since most of the transformer 10A is not covered by the circuit board, etc., a sufficient heat dissipation area can be ensured. As a result, the heat dissipation performance of the transformer 10A can be increased. The transformer 10A of this embodiment has a structure particularly suitable for forced air cooling.

[0129] In addition, the present invention is not limited to the above-mentioned embodiment, and various changes can be made within the scope of the present invention. For example, in the above-mentioned embodiment, an example in which the present invention is applied to a transformer is shown, but it can also be applied to other coil devices.

[0130] In the above embodiment, the number of segments formed in the bulkhead flanges 24, 26, 27 is not limited to three, but may be two or more than four. Figure 4D As shown, four partitions 243 may be formed on the back surface 24a of the end partition flange 24 to form four sections 24a1 to 24a4.

[0131] In the above embodiment, Figure 4B The width of the recessed portions 241 or the raised portions 242 shown in the figure in the direction perpendicular to the longitudinal direction or the repetition pitch may be different.

[0132] In the above embodiment, the shapes of the recesses 241, 261, 271 are not limited to Figure 4B The shapes shown in the above examples may also be shapes that widen from the inner side of the adjacent flanges 24, 26, and 27 toward the outer side. Figure 4B The shapes shown in the above examples may also be shapes that gradually narrow from the inside to the outside of the bulkhead flanges 24, 26, and 27.

[0133] In the above embodiment, if Figure 4B As shown in the figures, the concavoconvex parts 240, 260, 270 are formed so that the entire concavoconvex parts extend from the inside to the outside of the next wall flanges 24, 26, 27. However, the shapes of the concavoconvex parts 240, 260, 270 are not limited thereto, and at least a part of the concavoconvex parts may extend from the inside to the outside of the next wall flanges 24, 26, 27.

[0134] In the above embodiment, the extending direction of the partition 243 is not limited to Figure 4B The example shown can also be modified appropriately. This is the same for the partitions 263 and 273.

[0135] In the above embodiment, the extending direction of the plurality of concavo-convex 240 is not limited to Figure 4B The examples shown can also be modified appropriately.

[0136] In the above embodiment, the projections and depressions 240, 260, 270 are formed only on the back surfaces 24a, 26a, 27a of the partition wall flanges 24, 26, 27, but may be formed only on the front surfaces 24b, 26b, 27b, or may be formed on both surfaces.

[0137] In the above embodiment, if Figure 4A As shown, four partition wall flanges 24 to 27 are formed on the outer periphery of the winding core 28, but the number of the partition wall flanges is not particularly limited as long as there are plural.

[0138] Explanation of symbols

[0139] In the above embodiment, the first planar coil portion 311 and the second planar coil portion 321 are formed of planar conductors, but may be formed of conductive wires.

[0140] 10, 10A: Transformer

[0141] 20, 20A: Winding rack

[0142] 21, 21A: Winding frame body

[0143] 22, 22A: The first seat

[0144] 221: Side wall

[0145] 222: First lead-out path

[0146] 223, 223A: Lateral convex part

[0147] 224: Second lead-out path

[0148] 225: Central convex part

[0149] 23: Second pedestal

[0150] 231: Side wall

[0151] 24, 25: End bulkhead flange

[0152] 240: Concave and convex

[0153] 241: concave part

[0154] 242: convex part

[0155] 243: Divider

[0156] 244: Wire insertion slot

[0157] 245: Notch for lead wire

[0158] 24a: Lower surface

[0159] 24b: Upper surface

[0160] 24a1: First section

[0161] 24a2: Second section

[0162] 24a3: Third section

[0163] 24a4: Section 4

[0164] 25a: Lower surface

[0165] 25b: Upper surface

[0166] 26: Winding the flange of the next wall

[0167] 260: Concave and convex

[0168] 261: concave part

[0169] 262: convex part

[0170] 263: Divider

[0171] 264: Wire insertion slot

[0172] 26a: Lower surface

[0173] 26a1: First section

[0174] 26a2: Second section

[0175] 26a3: Third section

[0176] 26b: Upper surface

[0177] 26c, 26d: Lead wire locking part

[0178] 26e: Extended flange

[0179] 27: Winding the flange of the next door

[0180] 27a: Lower surface

[0181] 27b: Upper surface

[0182] 27c, 27d: Lead wire locking part

[0183] 27e: Extended flange

[0184] 28: Core

[0185] 29: Through hole for core pin

[0186] 31, 31A: First flat conductor

[0187] 311: First flat coil part

[0188] 312, 313, 312A, 313A: first flat lead portion

[0189] 32, 32A: Second flat conductor

[0190] 321: Second flat coil part

[0191] 322, 323, 322A, 323A: Second flat lead portion

[0192] 33: Wire

[0193] 331: Wire coil part

[0194] 332, 333: Wire lead part

[0195] 35: Terminal

[0196] 351: Wire connection part

[0197] 352: External connection

[0198] 40: Magnetic core (core)

[0199] 401: Upper core

[0200] 402: Lower core

[0201] 44: Base

[0202] 46: Midfoot

[0203] 48: Side foot

[0204] 100: Circuit board

[0205] 102: Frame

Claims

1. A winding frame, wherein a plurality of flanges are provided at predetermined intervals along the axial direction on the outer periphery of a winding core, characterized in that: A plurality of depressions and projections extending from the inner side of the flange portion toward the outer side are formed on the back side or the surface of one of the flange portions facing each other. The other flange portion does not have the protrusions and depressions formed thereon, The distance between the one flange portion and the other flange portion is configured to maintain a minimum distance. The depth of the concave portion in the concavoconvex is not more than 4 times and not less than 0.1 times the minimum interval, The minimum interval is set to the interval at which one wire enters, The back side or the surface of the flange portion having the concavoconvex part formed thereon is divided into a plurality of sections, A plurality of the concave and convex portions facing the same direction are formed in each section. A partition extending in a direction intersecting with a winding direction of the conductive wire wound around the outer circumference of the winding core is formed between the adjacent plurality of segments.

2. The winding frame according to claim 1, characterized in that: An extending direction of the plurality of concavo-convex portions formed in any one of the sections is different from an extending direction of the plurality of concavo-convex portions formed in the other sections.

3. The winding frame according to any one of claims 1 to 2, characterized in that: The plurality of projections and depressions are formed only on the rear surface of the flange portion.

4. The winding frame according to any one of claims 1 to 3, characterized in that: A wire insertion groove extending from the inside of the flange toward the outside is formed on the back side or the surface of the flange. The width of the wire insertion groove is wider than the width of the concave portion constituting the concavo-convex portion.

5. A coil device, comprising: The winding frame according to any one of claims 1 to 4; and A conductive wire is wound around the outer periphery of the winding core between the adjacent flange portions.

6. The coil device according to claim 5, characterized in that The invention has a plate-shaped coil portion formed of a plate-shaped conductor.

7. The coil device according to claim 6, characterized in that The plate-shaped coil portion is insert-molded on the bobbin.

8. The coil device according to claim 7, characterized in that The conductive wire is wound in multiple layers in a space between the adjacent flange portions so as to be in contact with the convex portions constituting the concavo-convex portions.

9. The coil device according to claim 8, characterized in that The minimum interval between the adjacent flange portions is set to an interval into which one of the conductive wires can enter.

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