JP4343871B2 - Coil parts - Google Patents

Description

  The present invention relates to a coil component used for an electronic device or the like.

As a conventional coil component, for example, a common mode choke coil as described in Patent Document 1 is known. The coil component described in this publication has a winding core, a pair of flanges integrally provided at both ends of the winding core, and two windings wound around the winding core. is doing. These windings are wound in a concentric manner around the core part in a state of being aligned in a direction along the central axis of the core part.
JP 2004-179314 A

  By the way, in the common mode choke coil as described above, when the impedance (inductance) changes according to the coupling coefficient of the lead portions of the two windings and the lead portions of the windings are drawn close to each other, the coupling coefficient Becomes higher and the impedance becomes higher. Since the impedance characteristic of the coil component is determined according to the application, it is desirable that the coil component can be easily adjusted.

  However, in the above-described prior art, the lead portion of one of the two windings is drawn from the inner layer and cannot be moved freely, and adjusts the impedance characteristics of the coil component. Is difficult. As a result, there may be a case where a coil component for the required application cannot be obtained.

  An object of the present invention is to provide a coil component capable of easily and reliably adjusting impedance characteristics.

The coil component of the present invention includes a core member having a winding core, a plurality of windings wound around the winding core, and a core member that is electrically connected to lead portions at both ends of each winding. The plurality of windings are arranged in a direction perpendicular to the axis of the winding core so that the lead-out portion is positioned in the outermost layer in a state where the windings are aligned in the axial direction of the winding core. The core member has a substantially square shape, and the core member has a notch at a portion including four corners. There are formed respectively, each of the terminal electrodes has a shaped electrode main body portion of the cross-section co-mounted so as to sandwich the side wall of the core member from above and below, the electrode main body and the connecting wire portion that is formed integrally with have, connecting wire portion is disposed in the notch portion to fit within the external dimensions of the core member Are, the lead portions of the drawn out winding from the outermost layer, is characterized in that it is connected to the joint line portion at a height position corresponding to the core portion.

  In this way, since all of the lead portions of the plurality of windings are drawn from the outermost layer, all the lead portions can be moved freely, so that the lead portions of each winding are close to each other. It can be pulled out or pulled out with the leading portions of each winding separated. As a result, the coupling coefficient between the lead portions of the windings can be freely set, so that the impedance characteristic of the coil component can be easily and reliably adjusted. Further, by adopting a winding method in which all the lead portions of a plurality of windings are drawn from the outermost layer, the line product ratio of the windings can be improved and the impedance of the coil component can be increased. Further, when the lead portion of the winding is not drawn from the outermost layer, for example, when the lead portion is connected to the terminal electrode, the lead portion may be forcibly and suddenly bent and disconnected. By pulling out all the wire drawing portions from the outermost layer, such disconnection of the winding can be prevented.

Preferably, the core member has a first core having a core portion and a pair of flange portions provided at both ends of the core portion, and a second core fixed to the first core so as to surround the first core. And the terminal electrode is provided on the second core. In this case, the core member can have a closed magnetic circuit structure. Thereby, since the leakage magnetic flux of a core member can be reduced, the impedance characteristic of a coil component can be improved and generation | occurrence | production of noise can be suppressed .

  According to the present invention, since the lead portions at both ends of the plurality of windings wound around the core portion of the core member are all drawn from the outermost layer, it is easy to adjust the impedance characteristics of the coil components. And it can be performed reliably. Thereby, for example, it is possible to provide a high-quality coil component that sufficiently copes with the customer's application.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a coil component according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of one embodiment of a coil component according to the present invention as viewed from the upper surface side, and FIG. 2 is a perspective view of the coil component shown in FIG. 1 as viewed from the lower surface side. In each figure, the coil component 1 of this embodiment is, for example, a common mode choke coil for a power supply line. The coil component 1 includes a core member 4 including a drum core 2 and a ring core 3. The core member 4 is made of a magnetic material such as ferrite.

  As shown in FIGS. 3 and 4, the drum core 2 includes a cylindrical core portion 5 and a pair of disk-shaped flange portions 6 </ b> A and 6 </ b> B provided at both ends of the core portion 5. ing. Two windings (conducting wires) 7 and 8 are wound around the core portion 5, thereby forming a coil portion 9.

  The lead-out portions 7a and 7b at both ends of the winding 7 and the lead-out portions 8a and 8b at both ends of the winding 8 extend from the core 5 toward substantially four directions. The windings 7 and 8 are arranged on the axis of the core 5 so that the lead-out portions 7a, 7b, 8a, and 8b are positioned on the outermost layer of the coil 9 in a state where they are aligned in the axial direction of the core 5. Multiple layers are wound in the vertical direction. As a result, the lead portions 7 a and 7 b of the winding 7 and the lead portions 8 a and 8 b of the winding 8 are all drawn from the outermost layer of the coil portion 9.

  As shown in FIG. 5, the ring core 3 has a through hole 10 having a circular cross section into which the drum core 2 is inserted, and is a substantially square core surrounding the drum core 2. Cutout portions 11 a, 11 b, 12 a, and 12 b are formed in portions including four corners on the lower surface of the ring core 3. The ring core 3 may have a recess having a circular cross section instead of the through hole 10.

  The ring core 3 has terminal electrodes 13a and 13b electrically connected to the lead portions 7a and 7b of the winding 7, respectively, and terminal electrodes 14a and 14b electrically connected to the lead portions 8a and 8b of the winding 8 respectively. 14b. The terminal electrodes 13 a and 14 a are fixed to one side wall of the ring core 3, and the terminal electrodes 13 b and 14 b are fixed to the other side wall of the ring core 3. The terminal electrodes 13a, 13b, 14a, and 14b are formed integrally with the electrode body 15 having a U-shaped cross-section attached so as to sandwich the side wall of the ring core 3 from above and below, 7 and 8 and a connecting part 16 having a U-shaped cross section. Each connecting portion 16 is configured to be disposed in the cutout portions 11 a, 11 b, 12 a, and 12 b of the ring core 3.

  When the drum core 2 around which the windings 7 and 8 are wound is assembled to the ring core 3, the drum core 2 is first inserted into the through hole 10 from the lower surface side of the ring core 3. The lead portions 7a and 7b at both ends of the winding 7 are connected to the connecting portions 16 of the terminal electrodes 13a and 13b, respectively, and the lead portions 8a and 8b at both ends of the winding 8 are connected to the terminal electrodes 14a and 14b. Connections are made to the sections 16 respectively. Specifically, as shown in FIG. 6, the lead portions 7a and 7b are respectively connected to the connecting portion 16 of the terminal electrodes 13a and 13b in a state of being bent substantially vertically, and the lead portions 8a and 8b are substantially In a straight line, the connection is made to the connecting portions 16 of the terminal electrodes 14a and 14b. At this time, since the lead portions 7a, 7b, 8a, and 8b are drawn from the outermost layer of the coil portion 9, the lead portions 7a, 7b, 8a, and 8b can be connected without being bent excessively.

  After the windings 7 and 8 are thus wired, the ring core 3 and the drum core 2 are integrally fixed by applying an adhesive across the upper surface 3a of the ring core 3 and the flange portion 6B of the drum core 2. Thereafter, for example, the connecting portions 16 of the terminal electrodes 13a, 13b, 14a, and 14b are irradiated with laser light to melt and connect the connecting portions 16 and the lead portions 7a, 7b, 8a, and 8b.

  Next, the windings 7 and 8 are put together on the core part 5 of the drum core 2 so that the lead-out parts 7a and 7b of the winding 7 and the lead-out parts 8a and 8b of the winding 8 are drawn out from the outermost layer of the coil part 9. A method of winding around will be described. FIG. 7 is a schematic configuration diagram of a winding device 17 used for winding the windings 7 and 8.

  In the figure, a winding device 17 includes a rotatable drum chuck portion 18 that holds the drum core 2, winding lead flyers 19 and 20 disposed above the drum chuck portion 18, and a lower portion of the drum chuck portion 18. Winding pull-in flyers 21 and 22 arranged in A ring chuck portion 23 that holds the ring core 3 is disposed between the drum chuck portion 18 and the winding pull-in flyer 22.

  The winding lead flyers 19 and 20 are respectively provided with cylindrical winding lead nozzles 24 and 25 extending downward. The winding lead nozzle 25 is disposed on the drum chuck portion 18 side by a predetermined amount from the winding lead nozzle 24. The winding lead-out nozzles 24 and 25 allow the windings 7 and 8 supplied from the winding supply unit (not shown) through the tension applying units 26 and 27 to pass therethrough, respectively. The winding derivation flyers 19 and 20 can be individually rotated about the rotation axis P of the drum chuck portion 18 as a central axis.

  The winding lead flyers 21 and 22 are respectively provided with winding leading nozzles 28 and 29 having a substantially U-shaped cross section extending upward. The winding pull-in nozzle 29 is arranged on the drum chuck portion 18 side by a predetermined amount (equivalent to the interval between the winding lead-out nozzles 25 and 26) from the winding pull-in nozzle 28. The windings 7 and 8 led out from the winding lead-out nozzles 24 and 25 are drawn into the winding lead-in nozzles 28 and 29, respectively. The winding pull-in flyers 21 and 22 can be individually rotated around the rotation axis P of the drum chuck portion 18 as a central axis.

  As shown in FIG. 8, the tip (lower end) of the winding lead-out nozzle 25 is positioned below the tip of the winding lead-out nozzle 24 by the outer diameter of the windings 7 and 8. The tip (upper end) of the winding lead-in nozzle 29 is positioned below the tip of the winding lead-in nozzle 28 by the outer diameter of the windings 7 and 8. As a result, the windings 7 and 8 can be wound together while being arranged in the axial direction of the core portion 5 of the drum core 2.

  Returning to FIG. 7, below the winding pull-in flyers 21, 22, winding holding portions 30, 31 that respectively hold the windings 7, 8 are provided so as to apply tension to the windings 7, 8. The winding holding portions 30 and 31 can be rotated together with the winding pull-in flyers 21 and 22, respectively.

  When winding the windings 7 and 8 around the core portion 5 of the drum core 2 with such a winding device 17, first, as shown in FIGS. 7 and 9, the winding lead-out nozzles 24 and 25 and the winding pull-in are performed. The nozzles 28 and 29 are arranged so as to be substantially at the same position. In this state, the drum chuck 18 and the winding pull-in flyers 21 and 22 are rotated clockwise. The rotational speed of the winding pull-in flyers 21 and 22 is set to be twice the rotational speed of the drum chuck portion 18.

  At this time, when the drum chuck portion 18 is rotated 1/4 from the initial state shown in FIG. 9, the winding pull-in flyers 21 and 22 are rotated 1/2. The drawing nozzles 28 and 29 move to a position opposite to the initial position with respect to the drum core 2. Accordingly, the windings 7 and 8 start to be wound in contact with the core portion 5 in a state where they are aligned in the axial direction of the core portion 5 of the drum core 2.

  When the drum chuck portion 18 is further rotated by 1/4 from the state shown in FIG. 10, the winding pull-in flyers 21 and 22 are further rotated by half, so that as shown in FIG. 28 and 29 return to the initial positions. As a result, the windings 7 and 8 are wound about 2/3 times in a state where they are aligned in the axial direction of the core 5 of the drum core 2.

  When the drum chuck portion 18 is further rotated 1/4 from the state shown in FIG. 11, the winding pull-in flyers 21 and 22 are further rotated 1/2. 28 and 29 again move to a position opposite to the initial position with respect to the drum core 2. Thus, the windings 7 and 8 are wound about one turn in a state where they are aligned in the axial direction of the core 5 of the drum core 2.

  From the state shown in FIG. 12, if the drum chuck portion 18 is further rotated by 1/4 and the drum chuck portion 18 is rotated once in total, the winding pull-in flyers 21 and 22 are further rotated by 1/2. As shown in FIG. 13, the winding lead-in nozzles 28 and 29 return to the initial position again. As a result, the windings 7 and 8 are further wound so as to push up the windings 7 and 8 that have already been wound.

  When the drum chuck portion 18 and the winding pull-in flyers 21 and 22 are further rotated as described above, the windings 7 and 8 are aligned in the axial direction of the core portion 5 of the drum core 2 as shown in FIG. In this state, it is wound over a plurality of layers (here, three layers) in a direction perpendicular to the axis of the winding core portion 5.

  Then, the winding lead flyers 19 and 20 are rotated so that the winding lead nozzles 24 and 25 reach the positions as shown in FIG. 15, and the winding lead nozzles 28 and 29 reach the positions as shown in FIG. Thus, the winding pull-in flyers 21 and 22 are rotated. Thereafter, in a state where the drum core 2 is assembled to the ring core 3 held by the ring chuck portion 23, the lead portions 7a and 7b at both ends of the winding 7 and the lead portions 8a and 8b at both ends of the winding 8 are secured by a predetermined amount. Then, the windings 7 and 8 are cut. Thereby, the drum core 2 with the windings 7 and 8 wound as shown in FIG. 3 is obtained.

  As described above, in the coil component 1 according to the present embodiment, the lead portions 7 a and 7 b at both ends of the winding 7 and the lead portions 8 a and 8 b at both ends of the winding 8 are both drawn from the outermost layer of the coil portion 9. Therefore, the drawer portions 7a and 7b and the drawer portions 8a and 8b can be moved freely without difficulty. This makes it possible to easily control the coupling coefficient determined by the proximity of the lead portions of the different windings 7 and 8, and consequently easily adjust the electrical characteristics such as impedance (inductance) of the coil component 1. can do. For example, when a high impedance is required, the coupling coefficient is increased by drawing the windings 7 and 8 close to each other, and when a low impedance is required, the winding What is necessary is just to make a coupling coefficient low by pulling out in the state which separated the 7 and 8 drawer parts. Therefore, it is possible to provide the coil component 1 having impedance characteristics corresponding to the required application.

  Further, since the windings 7 and 8 are wound so that the leading portions 7a and 7b of the winding 7 and the leading portions 8a and 8b of the winding 8 are all located in the outermost layer of the coil portion 9, Compared with aligned winding, the line area ratio can be improved. In this case, the impedance of the coil component 1 can be further increased.

  Further, unlike the case where the lead portions of the windings 7 and 8 are drawn from the inner layer of the coil portion 9, the coupling coefficient of the lead portions of the windings 7 and 8 is adjusted, or the lead portions of the windings 7 and 8 are adjusted. Therefore, the windings 7 and 8 do not have to be pulled or bent suddenly. Thereby, since disconnection of the windings 7 and 8 can be prevented, the reliability of the coil component 1 can be improved.

  The coil component according to the present invention is not limited to the above embodiment. For example, the coil component 1 of the above embodiment includes the drum core 2 around which the windings 7 and 8 are wound, and the ring core 3 provided with the terminal electrodes 13a, 13b, 14a, and 14b. Other than this, for example, the present invention can also be applied to a type in which a terminal electrode is provided on one flange portion of the drum core.

  Moreover, although the coil component 1 of the said embodiment winds the two windings 7 and 8 around the core part 5 of the drum core 2, this invention is not restricted to this in particular, The core part of a drum core It can also be applied to a coil wound with three or more windings.

It is the perspective view which looked at one Embodiment of the coil components concerning this invention from the upper surface side. It is the perspective view which looked at one Embodiment of the coil components concerning this invention from the lower surface side. FIG. 3 is a perspective view showing a state in which two windings are wound around a core part of the drum core shown in FIGS. 1 and 2. It is sectional drawing of the drum core of the state shown in FIG. FIG. 3 is a perspective view of the ring core shown in FIGS. 1 and 2. It is a top view including the partial cross section of the coil components shown in FIG.1 and FIG.2. It is a schematic block diagram of the winding apparatus used in order to wind two windings around the core part of the drum core shown in FIG.1 and FIG.2. FIG. 8 is a diagram illustrating a state in which two windings guided from a winding lead-out nozzle illustrated in FIG. 7 to a winding lead-in nozzle are wound around a core portion of a drum core. It is a conceptual diagram which shows the process of winding two windings around the core part of a drum core with the winding apparatus shown in FIG. It is the conceptual diagram which shows the process of winding two windings around the core part of a drum core with the winding apparatus shown in FIG. 7, and the arrow line view along the XX. FIG. 8 is a conceptual diagram showing a process of winding two windings around a core part of a drum core by the winding device shown in FIG. 7, and an arrow view along the line XI-XI. FIG. 8 is a conceptual diagram showing a process of winding two windings around a core part of a drum core by the winding device shown in FIG. 7 and an arrow view along the line XII-XII. FIG. 8 is a conceptual diagram showing a process of winding two windings around a core part of a drum core by the winding device shown in FIG. 7 and an arrow view along the line XIII-XIII. FIG. 8 is a conceptual diagram showing a process of winding two windings around a core part of a drum core by the winding device shown in FIG. 7 and an arrow view along the XIV-XIV line. It is a conceptual diagram which shows the process of winding two windings around the core part of a drum core with the winding apparatus shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Coil component, 2 ... Drum core (1st core), 3 ... Ring core (2nd core), 4 ... Core member, 5 ... Core part, 6A, 6B ... Gutter part, 7 ... Winding, 7a, 7b ... Lead-out part, 8 ... winding, 8a, 8b ... lead-out part, 13a, 13b, 14a, 14b ... terminal electrode.

Claims (2)

A core member having a core part;
A plurality of windings wound around the core, and
A plurality of terminal electrodes provided on the core member and electrically connected to the lead portions at both ends of each winding;
The plurality of windings are wound in a plurality of layers in a direction perpendicular to the axis of the core part so that the lead-out part is positioned in the outermost layer in a state where the windings are aligned in the axis direction of the core part. And
All the lead portions of each winding are drawn from the outermost layer,
The core member has a substantially square shape,
Notches are respectively formed in portions including four corners in the core member,
Each terminal electrode has a U-shaped electrode body part attached so as to sandwich the side wall of the core member from above and below, and a connecting part integrally formed with the electrode body part,
The connecting portion is disposed in the cutout portion so as to be within the outer dimensions of the core member,
The coil component, wherein the lead portion of each winding drawn from the outermost layer is connected to the connecting portion at a height position corresponding to the core portion. The core member is fixed to the first core so as to surround the first core, and a first core having a pair of flanges provided at both ends of the core and the core. A second core,
The coil component according to claim 1, wherein the terminal electrode is provided on the second core.

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