JP2022130249A - Coil device - Google Patents

Abstract

To provide a coil device capable of improving the difference in operating characteristics of a coil depending on a mounting direction.SOLUTION: On a winding core part 14 on one side of a pair of winding core parts, a wire 100 is wound from one side along an X-axis starting from the outside and ending on the outside. On the winding core part 14 as well on the other side, another wire 110 is similarly wound from one side along the X-axis starting from the outside and ending on the outside.SELECTED DRAWING: Figure 1A

Description

The present invention relates to a coil device suitably used for, for example, a common mode filter (common mode choke coil).

As a common mode filter, for example, a coil device in which two wires are wound around an annular core disclosed in Patent Document 1 is known. EMC components such as common mode filters are mounted in electronic equipment to reduce noise.

Variation in noise reduction characteristics is undesirable for EMC components. However, in the conventional coil device as disclosed in Patent Document 1, it has been found that the operating characteristics of the coil differ depending on the mounting direction.

JP 2014-192169 A

SUMMARY OF THE INVENTION An object of the present invention is to provide a coil device capable of improving the difference in operating characteristics of the coil depending on the mounting direction.

In order to achieve the above object, the coil device according to the first aspect of the present invention includes:
a pair of winding core portions arranged substantially parallel along the first axis at a predetermined interval along the second axis;
and a wire wound along the first axis around each of the winding cores,
The position of the first winding start/end point of each wire positioned on one side along the first axis is either within the outer region or the inner region of each winding core when viewed from the first axial direction. belong to
The position of the second winding start/end point of each wire located on the other side along the first axis belongs to the area on the same side as the area to which the first winding start/end point position belongs.

In the coil device according to the first aspect of the present invention, for example, in one of the pair of core portions, the wire starts to be wound from the outside from one side along the first axis and is wound on the outside. Similarly, on the other winding core portion, another wire is wound from the outside from one side along the first axis and is wound on the outside. Alternatively, in one of the pair of winding core portions, the wire is wound from the inside along the first axis from one side and ends at the inside, and the other winding core portion is similarly wound. Secondly, from one side along the first axis, another wire is wound from the inside and ends on the inside.

In the first aspect of the present invention, the "winding start/end point" of the wire means the position where the wire wound in a coil shape around the winding core first starts winding and contacts the winding core, or It shows the position where the wire wound in a coil around the winding core finishes winding and leaves contact with the winding core. After the wire is wound around the winding core, it is difficult to determine whether it is the starting point of winding or the ending point of winding.

According to the new knowledge of the inventors of the present invention, by making the winding start and end points of the wires wound around the pair of winding core portions belong to either the outer region or the inner region, the operating characteristics depending on the mounting direction can be improved. We have found that the difference can be improved. The reason for this is not necessarily clear, but can be explained, for example, as follows.

In a conventional coil device, when the wire is wound from the outside to the core, the winding ends on the inside. there were. This is presumably because the lead connection portion of the wire at the start of winding and the connection portion of the lead portion of the wire at the end of winding are positioned on the same side to facilitate connection.

However, if the winding start and winding end of the wire wound around the winding core are reversed between the outer side and the inner side, the symmetry of the leakage magnetic flux cannot be maintained between the winding start side and the winding end side. There was found. It was surmised that the asymmetry of this leakage magnetic flux might have an adverse effect on the characteristics of the coil device, and the present invention was completed.

That is, in the invention according to the first aspect of the present invention, the winding start and end points of the wires wound around the pair of winding core portions belong to either the outer region or the inner region. By configuring in this way, the symmetry of the leakage flux can be ensured between the winding start side and the winding end side, and as a result, it is considered that the difference in operating characteristics due to the mounting direction can be improved.

In the first aspect of the present invention, the inner region of the core is a half region closer to the other core when viewed from the first axial direction. Further, the outer region of the core portion is a half region on the side opposite to the side closer to the other core portion when the core portion is viewed from the first axial direction.

When viewed from the first axial direction, the first winding start/end point and the second winding start/end point located in the same side region (inner region or outer region) are aligned along the circumferential direction of the core. may be displaced from each other. The start/end points of the first roll and the start/end points of the second roll located in the same side region (inner region or outer region) are arranged at different positions rather than at the same positions along the circumferential direction. This facilitates the wire winding work and simplifies the arrangement of the connecting wire.

Preferably, the coil device according to the first aspect of the present invention includes:
a first connecting wire portion to which lead portions extending respectively from the start and end points of the first winding of the wire are connected;
a second connecting wire portion to which lead portions extending respectively from the start and end points of the second winding of the wire are connected;
Along a third axis that intersects both the first axis and the second axis, the first wire connection portion and the second wire connection portion are positioned on opposite sides of each other when viewed from the direction of the first axis. do.

By locating the first wire connection portion and the second wire connection portion on opposite sides along the third axis, the winding start and end points of the wires wound around the pair of winding core portions are set to the outer region or the inner region. It becomes easier to belong to either one of

Preferably, one end of the two winding core portions along the first axis is integrally connected by a first flange,
The other ends of the two winding core portions along the first axis are integrally connected by a second brim portion, and the first connecting wire portion provided on the first brim portion; The second connecting wire portion provided on the second collar portion is positioned on the opposite side to each other along the third axis when viewed from the first axial direction.

The first connecting wire portion may be attached to the first collar portion by plating, or may be joined to the first collar portion by adhesion or the like as a part of the metal terminal. Similarly, the second connecting wire portion may be attached to the second collar portion by plating, or may be joined to the second collar portion by adhesion or the like as a part of the metal terminal.

Preferably, each of the first wire connection portions is provided on each first terminal electrode, and each first terminal electrode has a side opposite to the first wire connection portion along the third axis. is equipped with a first dummy connecting wire part,
Each of the second wire connection portions is provided on each of the second terminal electrodes, and each of the second terminal electrodes has a second wire connection portion on the side opposite to the second wire connection portion along the third axis. 2 dummy connecting wire portions are provided. More preferably, the first dummy connecting wire portion and the second connecting wire portion have mounting-side protruding pieces whose tips are positioned substantially on the same plane.

By configuring in this way, the coil device can be easily mounted on a wiring board or the like without tilting the coil device.

Preferably, the second dummy wire connection portion and the first wire connection portion have anti-mounting side protruding pieces whose tips are positioned substantially on the same plane. By configuring in this way, it becomes easy to mount the cover member having a flat surface substantially parallel to the mounting surface on the side opposite to the mounting surface on the non-mounting side protruding piece. As a result, the coil device can be easily picked up and transported.

Preferably, a pair of bent pieces surrounding each lead portion extending along the first axis from both sides along the second axis, which are pulled out from the start and end points of the first winding of the wire respectively, are arranged in the opposite direction. Mounting side protruding piece has. Also preferably, a pair of bent pieces surrounding each lead portion extending along the first axis from both sides along the second axis, which are pulled out from the start and end points of the second winding of the wire, respectively, are provided as described above. Mounting side protruding piece has.

With this configuration, the connection work of each lead can be facilitated, and the bending of the wire in the vicinity of the lead can be minimized, the stress acting on the lead can be reduced, and the lead can be The connection strength of the part is improved.

A coil device according to a second aspect of the present invention includes:
a pair of winding core portions arranged substantially parallel along the first axis at a predetermined interval along the second axis;
a wire wound around each winding core along the first axis;
a first connecting wire portion to which a first lead portion of each wire located on one side along the first axis is connected, respectively;
a second connecting wire portion to which a second lead portion of each wire located on the other side along the first axis is connected, wherein
Along a third axis that intersects both the first axis and the second axis, the first wire connection portion and the second wire connection portion are positioned on opposite sides of each other when viewed from the direction of the first axis. do.

In the coil device according to the second aspect of the present invention, the first connecting wire portion and the second connecting wire portion are positioned on opposite sides along the third axis so that they are wound around the pair of winding core portions. It becomes easier to make the wire winding start/end point belong to either the outer region or the inner region.

FIG. 1A is a perspective view of a coil device according to one embodiment of the invention. FIG. 1B is a perspective view of a coil device according to another embodiment of the invention. FIG. 2 is an exploded perspective view of the coil device shown in FIG. 1A. FIG. 3 is a cross-sectional view of the coil device taken along line III--III shown in FIG. 1A. FIG. 4 is a front view of the coil device shown in FIG. 1A. FIG. 5 is a perspective view of terminal electrodes of the coil device shown in FIG. 1A. FIG. 6A is a schematic diagram of the measured magnetic flux distribution during operation of the coil device according to one embodiment of the present invention. 6B is an outline of the measurement of the magnetic flux distribution when the coil device is operated when the coil device shown in FIG. 6A is rotated 180 degrees around the virtual rotation axis perpendicular to the mounting substrate and mounted It is a diagram. FIG. 6C is an outline of the measurement of the magnetic flux distribution when the coil device is operated when the coil device shown in FIG. It is a diagram. FIG. 7A is a schematic diagram of magnetic flux distribution during operation of a coil device according to another embodiment of the present invention. FIG. 7B is an outline of the measurement of the magnetic flux distribution when the coil device is operated when the coil device shown in FIG. It is a diagram. FIG. 7C is an outline of the measurement of the magnetic flux distribution when the coil device is operated when the coil device shown in FIG. It is a diagram. FIG. 8A is a schematic diagram of the measured magnetic flux distribution during operation of the coil device according to the comparative example of the present invention. FIG. 8B is an outline of the measurement of the magnetic flux distribution when the coil device is operated when the coil device shown in FIG. It is a diagram.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described based on embodiments shown in the drawings. In the drawings, the X-axis (first axis), Y-axis (second axis) and Z-axis (third axis) are substantially perpendicular to each other.

FIRST EMBODIMENT A coil device 1 according to one embodiment of the present invention shown in FIG. 60, 80. In this embodiment, the coil device 1 further has a cover 50 .

As shown in FIG. 2, the core 10 has two winding core portions 12 and 14 arranged in parallel (parallel) along the X-axis direction with a predetermined distance in the Y-axis direction. One first collar portion 16a is connected to one end of the two winding core portions 12 and 14 along the X axis, and the other end of the two winding core portions 12 and 14 along the X axis. are connected to the other second collar portion 16b. In this embodiment, the core 10 is an annular core, and may be integrally molded, or may be assembled into an annular core by combining molded bodies.

Wires 100 and 110 are wound around the winding core portions 12 and 14, respectively, to form respective coil portions. The wires 100 and 110 are not particularly limited. A wire or the like can be used. Wire diameters of wires 100 and 110 are not particularly limited. It has an outer diameter about 5 times larger.

In this embodiment, the wires 100 and 110 are wound in the same number of turns around the winding cores 12 and 14 in mutually opposite directions when viewed from the X-axis direction. For example, a wire 100 is wound clockwise around one winding core portion 12 and a wire 110 is wound counterclockwise around the other winding core portion 14 . Two terminal electrodes 60 and 80 are attached to each of the flanges 16a and 16b.

A first lead portion 101a, which is one end (left side in FIG. 2) of the wire 100 wound around one winding core portion 12 arranged on the front side along the Y axis in FIG. It is connected to the terminal electrode 60 on the near side arranged on the collar portion 16a. A second lead portion 101b, which is the other end (right side in FIG. 2) of the wire 100, is connected to a terminal electrode 80 on the near side arranged on the other second collar portion 16b. Similarly, the first lead portion 111a, which is one end portion of the wire 110 wound around the other winding core portion 14 arranged on the back side along the Y-axis in FIG. The second lead portion 111b, which is the other end of the wire 110, is connected to the far side terminal electrode 60 arranged on the other second collar portion 16a, and is connected to the far side terminal electrode 80 arranged on the other second collar portion 16b. Connected.

The flanges 16a and 16b arranged on opposite sides along the X-axis of the core 10 have point-symmetrical (or line-symmetrical) configurations. Each of the flanges 16a and 16b has an outer end surface 24 positioned at the end along the X axis of the core 10, an inner end surface 25 positioned opposite thereto, a mounting side lower surface 22, and an upper surface 20 positioned opposite thereto. , and first and second side surfaces 26 and 28 located at both ends of the core 10 along the Y-axis.

The outer end surface 24 of each of the flanges 16a and 16b has a central outer end surface 24a located in the center in the Y-axis direction and side outer end surfaces 30 and 32 located on both sides in the Y-axis direction. The side outer end faces 30, 32 are slightly recessed along the X-axis from the central outer end face 24a in a stepped manner, but these outer end faces 24a, 30, 32 are substantially aligned with the plane containing the Z-axis and the Y-axis. parallel. The height of the step along the X-axis between the central outer end face 24a and the side outer end faces 30 (or 32) may be zero, but is preferably about the thickness of the terminal electrode 60 or 80 or less.

One X-axis end or the other X-axis end of each winding core 12, 14 is integrally connected to each of the inner end surfaces 25, 25 of each of the flanges 16a, 16b. A groove 38 extending along the Z-axis from the upper surface 20 of the flanges 16a, 16b toward the mounting-side lower surface 22 is formed in the center of the inner end surfaces 25, 25 of the flanges 16a, 16b in the Y-axis direction. There is. The groove portion 38 is located in the middle of the portions where the winding core portions 12 and 14 are connected to the flange portions 16a and 16b.

As shown in FIG. 3, a chamfered portion 25α is formed below the Z-axis of the inner end surface 25 of each of the flanges 16a and 16b toward the lower surface 22 on the mounting side. A chamfered portion 24α is formed across the lower surface 22 . The presence of these chamfers 24α and 25α facilitates molding (mold-cutting) of the core 10 .

As shown in FIG. 3, in the present embodiment, the upper surface 20 of each of the flanges 16a and 16b has a predetermined step height (preferably the terminal electrode 60 or 80) higher than the maximum height of the winding core 12 along the Z axis. 0.5 to 5 times the thickness of the plate), but the height of the step is not necessary. Moreover, the upper surface 20 of each of the flanges 16a and 16b may be configured to be higher than the maximum height of the winding core 12 along the Z-axis.

As shown in FIG. 2, at both ends in the Y-axis direction of each of the flanges 16a and 16b, the Z-axis lower ends of the first side surface 26 and the second side surface 28 are notched, and lock receiving portions 34 and 36 are provided, respectively. formed. Engagement claws 54, 55 formed at the lower ends of legs 52, 53 provided at the four corners of the cover 50 are detachably engaged with the engagement receiving portions 34, 36, respectively. It's becoming

Since the notch-shaped engagement receiving portions 34 and 35 are formed below both ends of the flange portions 16a and 16b in the Y-axis direction, the width of the mounting-side lower surface 22 in the Y-axis direction is equal to the width of the upper surface 20 in the Y-axis direction. formed narrower than However, the width of the mounting-side lower surface 22 in the Y-axis direction is larger than the width of the central outer end surface 24a in the Y-axis direction, and the width of the lateral outer end surfaces 30 and 32 on the mounting-side lower surface 22 side can be ensured with a sufficient dimension. is determined as

As shown in FIG. 2, the cover 50 includes a flat lid portion 51 and leg portions 52 that protrude downward along the Z axis after branching from both ends along the Y axis of the lid portion 51 along the X axis. , 53. At the lower ends of the legs 52 and 53 along the Z axis, the locking claws 54 and 55 are formed integrally.

The cover 50 also has a pair of convex block portions 58 protruding to both sides along the X-axis at a lower portion near the center of the lid portion 51 along the Y-axis. Each convex block portion 58 can come into contact with the central portion along the Y-axis of the upper surface 20 of each flange portion 16a, 16b. A plate-shaped partition portion 56 extending along the X axis is integrally formed on the lower surface of the lid portion 51 located in the center along the Y axis so as to connect the pair of convex block portions 58 .

The lower end of the plate-shaped partition 56 along the Z-axis protrudes further downward along the Z-axis than the lower end of the convex block 58 along the Z-axis. Both side ends are attached to grooves 38 formed in the inner end surfaces 25 of the flanges 16a and 16b so as to be vertically slidable. The partition portion 56 effectively prevents the wires 100 and 110 wound around the winding core portions 12 and 14 in a coil form from coming into contact with each other, thereby ensuring insulation therebetween. The upper surface of the lid portion 51 of the cover 50 is flat, and is attracted to a suction nozzle or the like, thereby facilitating the transportation of the coil device 1 .

The cover 50 is made of, for example, a non-magnetic material such as resin, but the resin may contain a magnetic metal material or a magnetic material such as ferride. Moreover, the cover 50 may be made of a magnetic material such as a metallic magnetic material or ferrite, similarly to the core 10 . If the cover 50 is made of a magnetic material, or if the cover 50 contains a magnetic material, the cover 50 and the core 10 may form a closed magnetic circuit.

As shown in FIG. 5, the terminal electrode 60 and the terminal electrode 80 have the same shape and the same size. With respect to the terminal electrode 80 attached to the flange portion 16b, the arrangement relationship between the connecting wire portion and the dummy connecting wire portion is reversed vertically in the Z-axis direction. Each terminal electrode 60, 80 has a terminal main piece (terminal main portion) 62, 82, a connecting wire portion 70, 90, and a dummy connecting wire portion 78, 98, each having a plate thickness of approximately It is formed by bending a fixed piece of metal. The dummy wire connection portions 78 and 98 are arranged on the opposite side of the wire connection portions 70 and 90 along the Z-axis with the terminal main pieces 62 and 82 interposed therebetween, and have the same shape as the wire connection portions 70 and 90. are the same size.

In this embodiment, the wire connection portions 70 and 90 and the dummy wire connection portions 78 and 98 have base pieces 68 and 88 and projecting pieces 76 and 96 . The connecting wire portion 70 of the terminal electrode 60 is located in the upper part in the Z-axis direction, and is a portion to which the first lead portion 101a of the wire 100 or the first lead portion 111a of the wire 110 shown in FIG. 4 is connected. 5 is a portion to which the second lead portion 101b of the wire 100 is connected as shown in FIG. 3, and the second lead portion of the wire 110 shown in FIG. It is also the part to which the part 111b is connected. Note that the first lead portions 101a, 111a and the second lead portions 101b, 111b are not connected to the dummy connecting wire portions 78, 98, respectively.

As shown in FIG. 3, the base pieces 68, 88 positioned above the terminal electrodes 60, 80 in the Z-axis direction are arranged along the upper surfaces 20, 20 of the respective flanges 16a, 16b. The upper ends of the main pieces 62, 82 along the Z-axis are bent substantially vertically toward the upper surfaces 20, 20 of the flanges 16a, 16b. It should be noted that the base pieces 68, 88 may be adhered to the upper surfaces 20, 20 of the respective collars 16a, 16b, but may also engage the upper surfaces 20, 20 without adhesion, or may be somewhat , so as to face the upper surfaces 20, 20 of the flanges 16a, 16b.

The other base pieces 68, 88 located below the terminal electrodes 60, 80 in the Z-axis direction are arranged along the mounting side lower surfaces 22, 22 of the respective flanges 16a, 16b. The lower ends of the pieces 62, 82 along the Z-axis are bent substantially perpendicularly toward the mounting-side lower surfaces 22, 22 of the flanges 16a, 16b. The base pieces 68 and 88 may be adhered to the mounting side upper surfaces 22 and 22 of the respective flanges 16a and 16b, but they are not adhered to the mounting side lower surfaces 22 and 22 and are engaged with each other. Alternatively, they may be arranged so as to face the mounting-side lower surfaces 22, 22 of the flanges 16a, 16b at some intervals.

As shown in FIG. 5, on both sides along the Y-axis of each base piece 68 of the terminal electrode 60, projecting pieces 76 project obliquely toward the outside (upper or lower side) of the Z-axis. , are integrally bent and molded. Each protruding piece 76 is inclined at an acute angle with respect to the base piece 68 so that the tip thereof approaches above the base piece 68 . As shown in FIG. 4, the lead portion 101a or 111a can be passed between the pair of protruding pieces 76 on the base piece 68 of the connection portion 70 (upper surface in the Z-axis direction) and crimped. A first lead 101a (111a) of the wire 100 (110) is sandwiched between the pair of projecting pieces 76 and connected to each base piece 68 by solder 5 or the like.

As shown in FIG. 5, similarly to the terminal electrode 60, on both sides along the Y axis of each base piece 88 of the terminal electrode 80, projecting pieces 96 are provided outside (upper or lower side) of the Z axis. It is integrally bent and molded so as to protrude at an angle toward the user. Each protruding piece 96 is inclined at an acute angle with respect to the base piece 88 so that the tip thereof approaches above the base piece 88 . Further, the lead portion 101b or 111b can be passed between the pair of protruding pieces 96 on the base piece 88 (lower surface in the Z-axis direction) of the connecting wire portion 90 and crimped. The second lead 101b (111b) of the wire 100 (110) is sandwiched between the pair of projecting pieces 96 and connected to each base piece 88 by solder 5 or the like.

As shown in FIG. 3, the terminal main pieces 62, 82 are arranged so as to face the outer end surfaces 24, 24 of the respective flanges 16a, 16b. 24 are adhered to lateral outer end surfaces 30 and 32 located on both sides in the Y-axis direction using an adhesive.

Terminal electrodes 60 and 80 are made of metal such as tough pitch steel, phosphor bronze, brass, iron, nickel, nickel alloy, and stainless steel. The terminal electrodes 60 and 80 can be integrally formed by punching, pressing, and bending a conductive metal plate. Further, it is preferable that the wire connection portions 70, 90 and the dummy wire connection portions 78, 98 are formed with a plating film such as tin or an alloy containing tin as a solder adhesion reinforcing layer.

Next, the relationship between the wires 100, 110, the winding cores 12, 14, and the terminal electrodes 60, 80 will be described in detail. Note that the relationship between the wire 110, the core portion 14, and the terminal electrodes 60, 80 is the same as that of the wire 100, the core portion 12, and the terminal electrodes 60, 80, except that the wire 110, the core portion 14, and the terminal electrodes 60, 80 are wound around the core portion 14 in the reverse rotation direction. , and a part of the explanation thereof is omitted.

As shown in FIG. 1A, a wire 100 is wound around the winding core 12 in a plurality of turns clockwise along the X-axis. The tip of the first lead portion 101a, which is one end of the wire 100 in the X-axis direction, is connected to the upper base piece 68 of the terminal electrode 60 arranged on the front side along the Y-axis of the first collar portion 16a. and extends in the X-axis direction between the pair of projecting pieces 76 . In the present embodiment, the wire 100 is inclined in the lower right direction from the tip of the first lead portion 101a toward the winding core portion 12, and contacts the winding core portion 12 at the first winding start/end point 102a. 12 are wound in the same direction.

After the wire 100 is wound around the winding core 12 in a plurality of turns clockwise along the X-axis, the second lead 101b of the wire 100 is wound from the winding core 12 at the second winding start and end points 102b of the wire. Separated, it is pulled out obliquely toward the base piece 88 below the terminal electrode 80 shown in FIG. 3 and connected. From the lower surface of the base piece 88, the tip of the second lead portion 101b of the wire 100 is pulled out along the X-axis.

Note that the first winding start/end point 102a is a portion where the coil starts to be wound when the wire 100 is wound around the core portion 12 from the first lead portion 101a. When the winding 100 is started around the winding core 12, the winding of the coil ends. The second winding start/end point 102b is a portion where the winding of the wire 100 from the first lead portion 101a to the core portion 12 ends when the wire 100 is wound around the core portion 12, and the wire 100 is wound from the second lead portion 101b. If the winding is started at the portion 12, it is the portion which becomes the winding start of the coil.

In this embodiment, the first winding start/end point 102a, which is the winding start or the winding end of the wire 100 wound around the winding core 12, is located outside the straight line along the Z-axis including the central axis O1 of the coil shown in FIG. 12a. A second winding start/end point 102b, which is the winding start or the winding end of the wire 100 wound around the winding core 12, is also located so as to belong to the outer region 12a. However, the first volume start/end point 102a and the second volume start/end point 102b are located at different positions along the Z-axis, and are located in opposite directions to a line parallel to the Y-axis including the central axis O1. .

The central axis O1 of the coil is the central line along the X-axis of the core portion 12 shown in FIG. 1A. The inner region 12b of the core portion 12 is a half region closer to the other core portion 14 when the core portion 12 is viewed from the X-axis direction. Further, the outer region 12a of the core portion 12 is a half region on the opposite side to the side closer to the other core portion 14 when the core portion 12 is viewed from the X-axis direction.

Similarly, as shown in FIG. 1A, a wire 110 is wound counterclockwise along the X-axis with a plurality of turns (the same number of turns as the wire 100). The tip of the first lead portion 111a, which is one end of the wire 110 in the X-axis direction, is connected to the base piece 68 on the upper side of the terminal electrode 60 arranged on the back side along the Y-axis of the second collar portion 16b. and extends in the X-axis direction between the pair of projecting pieces 76 . In this embodiment, the wire 110 inclines in the lower left direction from the tip of the first lead portion 111a toward the winding core portion 12 and contacts the winding core portion 14 at the first winding start/end points 112a. are wound in the same direction.

After the wire 110 is wound counterclockwise along the X axis around the winding core 14 with a plurality of turns, as shown in FIG. At 112b, it separates from the winding core 12 and is drawn obliquely toward the base piece 88 on the lower side of the terminal electrode 80 and connected. From the lower surface of the base piece 88, the tip of the second lead portion 111b of the wire 110 is pulled out along the X-axis.

Note that the first winding start/end point 112a is a portion where the winding of the wire 100 from the first lead portion 111a to the winding core portion 14 is started, and the wire 110 is wound from the second lead portion 111b to the winding core portion. When the winding is started at the portion 14, the winding of the coil is finished. The second winding start/end point 112b is a portion where the winding of the wire 110 from the first lead portion 111a to the winding core portion 14 ends when the wire 110 is wound around the winding core portion 14. If the winding is started at the portion 14, it is the portion which becomes the winding start of the coil.

In this embodiment, the first winding start/end point 112a, which is the winding start or the winding end of the wire 110 wound around the winding core 14, is located outside the straight line along the Z-axis including the central axis O2 of the coil shown in FIG. 14a. A second winding start/end point 112b, which is the winding start or the winding end of the wire 110 wound around the winding core 14, is also located so as to belong to the outer region 14a. However, the first volume start/end point 102b and the second volume start/end point 112b are located at different positions along the Z-axis, and are located in opposite directions to a line parallel to the Y-axis including the central axis O2. .

The central axis O2 of the coil is the central line along the X-axis of the core portion 14 shown in FIG. 1A. The inner region 14b of the core portion 14 is a half region closer to the other core portion 12 when the core portion 14 is viewed from the X-axis direction. Further, the outer region 14a of the core portion 14 is a half region on the opposite side to the side closer to the other core portion 12 when the core portion 14 is viewed from the X-axis direction.

In the coil device 1 according to the present embodiment, for example, in one of the pair of core portions 12 and 14, the wire 100 starts to be wound from the outside along the X axis from one side, and In the other winding core portion 14, similarly, another wire 110 starts winding from the outside from one side along the X-axis and finishes winding on the outside.

That is, the first winding start/end point 102a and the second winding start/end point 102b of the wire 100 wound around the winding core part 12 belong to the outer region 12a, and the wire 110 wound around the winding core part 14 has a first winding start/end point 102a and a second winding start/end point 102b. The first volume start/end point 112a and the second volume start/end point 112b belong to the outer region 14a. By configuring in this way, the symmetry of the leakage magnetic flux can be ensured between the winding start side and the winding end side, and as a result, the difference in operating characteristics due to the mounting direction can be improved.

Further, in the present embodiment, the first winding start/end point 102a (112a) and the second winding start/end point 102b (112b) positioned within the outer region 12a (14a) on the same side when viewed from the X-axis direction are , are displaced from each other along the circumferential direction of the winding core 12 (14). Rather than arranging the first roll start/end point 102a (112a) and the second roll start/end point 102b (112b) located in the outer region 12a (14a) on the same side at the same position along the circumferential direction. Arranging them at different positions facilitates the winding operation of the wire 100 (110) and also simplifies the arrangement of the connecting wire portion 70 (90).

Further, in the present embodiment, as shown in FIG. 4, first connecting wire portions 70 and 70 connected by lead portions 101a and 111a extending from first winding start/end points 102a and 112a, respectively, and second winding start/end point 102b , 112b are located on opposite sides of each other along the Z-axis.

By locating the first connecting wire portions 70, 70 and the second connecting wire portions 90, 90 on opposite sides along the Z-axis, the wires 100, 110 wound around the pair of winding core portions 12, 14, respectively It becomes easier to make the winding start/end points 102a, 102b, 112a, 112b belong to the respective outer regions 12a and 14a.

Further, in the present embodiment, the first wire connection portions 70, 70 are provided on the first terminal electrodes 60, 60, respectively, and the first wire connection portions 70 are provided on the first terminal electrodes 60, 60, respectively. , 70 are provided on the opposite side along the Z-axis. Moreover, each of the second wire connection portions 90, 90 is provided on each of the second terminal electrodes 80, 80, and each of the second terminal electrodes 80, 80 has a A second dummy wire connection portion 98 is provided on the opposite side along the Z axis. The first dummy wire connection portions 78, 78 and the second wire connection portions 90, 90 have projecting pieces 76, 96 on the mounting side whose tips are positioned substantially on the same plane. By configuring in this way, the coil device 1 can be easily mounted on a wiring board or the like without tilting the coil device 1 .

Further, the second dummy wire connection portions 98, 98 and the first wire connection portions 70, 70 have projecting pieces 76, 96 on the anti-mounting side whose tips are positioned substantially on the same plane. With this configuration, it becomes easy to mount the cover member 50 having a flat surface substantially parallel to the mounting surface on the side opposite to the mounting surface on the projecting pieces 76 and 96 on the non-mounting side. As a result, the coil device 1 can be easily picked up and transported. Also, in this embodiment, if the cover 50 is not provided, either the upper surface or the lower surface of the coil device 1 in the Z-axis direction can be mounted on a circuit board or the like without any problem.

Further, in this embodiment, a pair of bent pieces surrounding the ends of the lead portions 101a, 111a, 101b, 111b of the wires 100, 110 extending along the X-axis from both sides along the Y-axis are formed as projecting pieces 76. , 96 have. By configuring in this way, the connecting work of the lead portions 101a, 111a, 101b, and 111b is facilitated, and the bending of the wires 100 and 110 near the lead portions 101a, 111a, 101b, and 111b is minimized. , the stress acting on the lead portions 101a, 111a, 101b, 111b is reduced, and the connection strength of the lead portions 101a, 111a, 101b, 111b to the terminal electrodes 60, 80 is improved.

In this embodiment, the wires 100 and 110 are wound around the winding cores 12 and 14 in line symmetry with each other, and can preferably function as a common mode filter.

Second Embodiment A coil device 2 according to another embodiment of the present invention shown in FIG. 1B is a modification of the coil device 1 according to the above-described first embodiment, and has the same configuration and action except as described below. have an effect. In the following, mainly different parts from the coil device 1 according to the first embodiment will be explained, and explanations of overlapping parts will be omitted.

As shown in FIG. 1B, in this embodiment, wires 100 and 110 are wound around winding cores 12 and 14 in directions opposite to those in the first embodiment.

That is, as shown in FIG. 1B, in the coil device 1 according to the present embodiment, for example, in one of the pair of core portions 12 and 14, the wire 100 is pulled from one side along the X axis. starts winding from the inside and finishes winding on the inside, and in the other winding core part 14, similarly, another wire 110 starts winding from the inside from one side along the X axis and finishes winding on the inside. there is

That is, the first winding start/end point 102a and the second winding start/end point 102b of the wire 100 wound around the winding core 12 belong to the inner region 12b shown in FIG. A first winding start/end point 112a and a second winding start/end point 112b of the wire 110 belong to the inner region 14b shown in FIG. By configuring in this way, also in this embodiment, the symmetry of the leakage flux can be ensured between the winding start side and the winding end side, and as a result, the difference in operating characteristics depending on the mounting direction can be improved.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the present invention.

For example, in the above-described embodiment, the terminal electrodes 60 and 80 are formed of conductive plate pieces, and the conductive plate pieces include connecting wire portions 70 and 90 and terminal main portions connected to the connecting wire portions 70 and 90. 62 and 82 are integrally molded, but not limited to this. For example, the terminal electrodes including at least the connecting wire portions 70 and 90 may be formed as plating films formed on the surfaces of the flange portions 16a and 16b.

Moreover, in the above-described embodiment, as shown in FIG. It may be connected by a method such as welding, thermocompression bonding, arc welding, or resistance welding.

Further, applications of the coil device 1 are not limited to common mode filters (common mode choke coils), but can also be used as balun transformers, pulse transformers, choke coils, signal transformers, winding products, and the like. In the above-described embodiment, the wires 100 and 110 are wound with the same number of turns on the core portions 12 and 14 in mutually opposite directions when viewed from the X-axis direction. It may be wound.

The present invention will be described below based on more detailed examples, but the present invention is not limited to these examples.

Example 1
For the coil device 1 (without the cover 50 attached) shown in FIG. 1A, a computer simulation was performed for each leakage magnetic flux when the direction of current flow was changed.

FIG. 6A shows the coil device 1 according to the first embodiment, in which a current is applied in order from the terminal 60 indicated by the symbol a1 to the terminal 80 indicated by the symbol b1, the terminal 80 indicated by the symbol c1, and the terminal 60 indicated by the symbol d1. This is the result of a magnetic flux simulation. Also, FIG. 6B shows the case where the terminals of the coil device 1 shown in FIG. This is the result of a simulation. That is, in FIG. 6B, the leakage magnetic flux is simulated by passing a current in order from the terminal 80 indicated by the symbol c1 to the terminal 60 indicated by the symbol d1, the terminal 60 indicated by the symbol a1, and the terminal 80 indicated by the symbol b1. .

Also, FIG. 6C shows a case where the terminals of the coil device 1 shown in FIG. This is the result of a simulation. That is, in FIG. 6C, the leakage magnetic flux is simulated by passing a current in order from the terminal 80 indicated by the symbol b1 to the terminal 60 indicated by the symbol a1, the terminal 60 indicated by the symbol d1, and the terminal 80 indicated by the symbol c1. .

In FIGS. 6A to 6C, B1, B2, B3 and B4 respectively represent the magnetic flux densities of the leakage magnetic fluxes, the magnetic flux density being highest at B1 and gradually decreasing to B2, B3 and B4.

Example 2
For the coil device 2 shown in FIG. 1B, a computer simulation was performed for each leakage magnetic flux when the direction of current flow was changed.

FIG. 7A shows a coil device 2 according to the second embodiment in which a current is applied in order from a terminal 60 indicated by symbol a2 to a terminal 80 indicated by symbol b2, a terminal 80 indicated by symbol c2, and a terminal 60 indicated by symbol d2. This is the result of a magnetic flux simulation. Also, FIG. 7B shows the case where the terminals of the coil device 2 shown in FIG. This is the result of a simulation. That is, in FIG. 7B, the leakage magnetic flux is simulated by passing a current in order from the terminal 80 indicated by the symbol c2 to the terminal 60 indicated by the symbol d2, the terminal 60 indicated by the symbol a2, and the terminal 80 indicated by the symbol b2. .

Also, FIG. 7C shows a case where the terminals of the coil device 2 shown in FIG. This is the result of a simulation. That is, in FIG. 7C, the leakage magnetic flux is simulated by passing a current in order from the terminal 80 indicated by the symbol b2 to the terminal 60 indicated by the symbol a2, the terminal 60 indicated by the symbol d2, and the terminal 80 indicated by the symbol c2. .

In FIGS. 7A to 7C, B1a, B2a, B3a, and B4a respectively represent the magnetic flux densities of the leakage magnetic fluxes, with B1a having the highest magnetic flux density and gradually decreasing to B2a, B3a, and B4a.

Comparative example 1
For the conventional coil device 3 in which all the lead portions are connected to the connecting wire portion arranged on the upper surface of the collar portion, a computer simulation was performed for each leakage magnetic flux when the direction of current flow was changed. That is, in the conventional coil device 3, the winding direction of the coil is determined by a winding method in which the winding of the wire wound around each winding core portion starts from the outside and ends in the inside, or a winding method in which the winding starts from the inside. The winding method was such that the winding ended on the outside.

FIG. 8A shows a simulation of the leakage magnetic flux in the coil device 3 by passing current in order from the terminal 60a indicated by the symbol a3 to the terminal 80a indicated by the symbol b3, the terminal 80a indicated by the symbol c3, and the terminal 60a indicated by the symbol d3. This is the result. Moreover, FIG. 8B shows a case where the terminals of the coil device 3 shown in FIG. This is the result of a simulation. That is, in FIG. 8B, the leakage magnetic flux is simulated by passing current in order from the terminal 80a indicated by C3 to the terminal 60a indicated by d3, the terminal 60a indicated by reference a3, and the terminal 80 indicated by reference b3. .

In FIGS. 8A and 8B, B1b, B2b, B3b, and B4b respectively represent the magnetic flux densities of the leakage magnetic fluxes, and the magnetic flux density is highest at B1b and gradually decreases to B2b, B3b, and B4b.

Evaluation Compared to the change in leakage flux shown in Comparative Example 1 shown in FIGS. 8A and 8B, in Example 1 shown in FIGS. 6A and 6B and Example 2 shown in FIGS. 7A and 7B, the mounting direction is opposite. It was confirmed that the change in the leakage magnetic flux was small even when That is, compared with Comparative Example 1, in Examples 1 and 2, it was possible to predict that the change in operating characteristics due to the difference in the mounting direction was small. In addition, in Example 2, compared with Example 1, it has confirmed that the area|region where leakage magnetic flux becomes large can also be minimized. Moreover, in Example 1, it was confirmed that the pattern of the leakage magnetic flux is almost the same in FIGS. 6A and 6B, and that even when the mounting direction is reversed, the change in the leakage magnetic flux is smaller.

In Example 1 shown in FIGS. 6A and 6C and Example 2 shown in FIGS. 7A and 7C, it was confirmed that the change in leakage flux was small even when the mounting surface was reversed. That is, unlike Comparative Example 1, it was possible to predict that Examples 1 and 2 could be used without problems even if the mounting surfaces were reversed.

Reference Signs List 1, 2, 3 Coil device 5 Solder 10 Cores 12, 14 Core portions 12a, 14a Outer regions 12b, 14b Inner region 16a First flange 16b Second flange 20 Upper surface 22 Mounting-side lower surface 24 Outer end surface 24a Central outer end surface 25 Inner end surface 26 First side surface 28 Second side surfaces 30, 32 Lateral outer end surfaces 34, 36 Lock receiving portion 38 Groove portion 50 Cover 51 Lid portions 52, 53 Leg portions 54, 55 Engagement claw 56 Partition portion 58 Convex block portions 60, 80 Terminal electrodes 60a, 80a Outer surfaces 60b, 80b Inner surfaces 62, 82 Terminal main pieces (terminal main part)
68, 88... Base pieces 70, 90... Connection parts 76, 96... Protruding pieces 78, 98... Dummy connection parts 100, 110... Wires 101a, 111a... First lead parts 101b, 111b... Second lead parts 102a, 112a... Volume 1 start/end point 102b, 112b... Volume 2 start/end point

Claims (9)

A pair of winding cores arranged substantially parallel to each other along a first axis at a predetermined interval along a second axis, and a wire wound around each of the winding cores along the first axis. , a coil device having
The position of the first winding start/end point of each wire positioned on one side along the first axis is either within the outer region or the inner region of each winding core when viewed from the first axial direction. belong to
A coil device in which the position of the second winding start/end point of each wire located on the other side along the first axis belongs to the area on the same side as the area to which the first winding start/end point positions belong. . When viewed from the first axial direction, the first winding start/end point and the second winding start/end point located in the same side region are displaced from each other along the circumferential direction of the core portion. 2. The coil device according to claim 1. a first connecting wire portion to which lead portions extending respectively from the start and end points of the first winding of the wire are connected;
a second connecting wire portion to which lead portions extending respectively from the start and end points of the second winding of the wire are connected;
Along a third axis that intersects both the first axis and the second axis, the first wire connection portion and the second wire connection portion are positioned on opposite sides of each other when viewed from the direction of the first axis. The coil device according to claim 1 or 2. One end of the two winding core portions along the first axis is integrally connected by a first flange,
The other ends of the two winding core portions along the first axis are integrally connected by a second brim portion, and the first connecting wire portion provided on the first brim portion; 4. The coil device according to claim 3, wherein said second connecting wire portion provided on said second collar portion is positioned on opposite sides along said third axis when viewed from said first axial direction. . Each of the first connecting wire portions is provided on each of the first terminal electrodes, and each of the first terminal electrodes has a first connecting wire portion on the side opposite to the first connecting wire portion along the third axis. 1 dummy connecting wire part is provided,
Each of the second wire connection portions is provided on each of the second terminal electrodes, and each of the second terminal electrodes has a second wire connection portion on the side opposite to the second wire connection portion along the third axis. It is equipped with 2 dummy connecting wire parts,
The coil device according to any one of claims 2 to 4, wherein the first dummy wire connection portion and the second wire connection portion have mounting-side projecting pieces whose tips are positioned substantially on the same plane. 6. The coil device according to claim 5, wherein said second dummy wire connection portion and said first wire connection portion have anti-mounting side projecting pieces whose tips are positioned substantially on the same plane. A pair of bent pieces surrounding each lead portion extending along the first axis from both sides along the second axis projecting from the anti-mounting side projecting from the first winding start and end points of the wires. 7. A coil system as claimed in claim 6, wherein the strip comprises. a pair of bent pieces surrounding each lead portion extending along the first axis from each of the second winding start and end points of each of the wires along the second axis; The coil device according to any one of claims 5 to 7, which has a pair of winding core portions arranged substantially parallel along the first axis at a predetermined interval along the second axis;
a wire wound around each winding core along the first axis;
a first connecting wire portion to which a first lead portion of each wire located on one side along the first axis is connected, respectively;
a second connecting wire portion to which a second lead portion of each wire located on the other side along the first axis is connected, wherein
Along a third axis that intersects both the first axis and the second axis, the first wire connection portion and the second wire connection portion are positioned on opposite sides of each other when viewed from the direction of the first axis. coil device.

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