JP7322984B2 - coil parts - Google Patents

Description

The present invention relates to coil components.

Conventionally, as a coil component, there has been known a common mode choke coil in which a pair of wires are wound around a core portion of a drum core, and ends of the wires are electrically connected to electrode portions provided on a flange portion of the drum core. (See Patent Document 1, for example). In such a common mode choke coil, lead wires, which are terminals of each wire, are electrically connected to electrodes on the collar of the core. In addition, there is one in which a plate-shaped core made of a magnetic material is adhered and fixed to the surface of the collar portion opposite to the surface on which the electrodes are formed (see, for example, Patent Document 2).

JP 2014-75533 A JP 2017-85181 A

By the way, in the coil component such as the common mode choke coil as described above, when the plate-shaped core and the flange are adhered and fixed, a large amount of adhesive is used in order to reliably maintain the fixed state between the plate-shaped core and the flange. There is a risk that the adhesive will spill out. If the adhesive spills outside the plate-shaped core or the flange and solidifies, it may spoil the appearance or cause an unintended increase in the size of the product.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a coil component capable of suppressing damage to the external shape and suppressing unintended increase in size.

A coil component for solving the above problems includes a drum core having a core and a pair of flanges provided at both ends of the core, electrodes provided on each of the pair of flanges, and the core. and a wire having a lead portion electrically connected to the electrode; At least one of the flange portion and the plate-like core has at least one ridgeline portion positioned inside an imaginary ridgeline portion where extended surfaces of both surfaces sandwiching the ridgeline portion intersect, and forms a reservoir for storing the adhesive. have.

ADVANTAGE OF THE INVENTION According to the coil component of this invention, while suppressing spoiling an external shape, unintended enlargement is suppressed.

FIG. 2 is a perspective view of a coil component according to the first embodiment; A bottom view of the coil component in the same embodiment. The side view of the coil component in the same embodiment. The front view of the coil component in the same embodiment. (a) to (d) are cross-sectional views showing an example of the shape of the drum core in the same embodiment. FIG. 4 is a cross-sectional view showing the plating structure in the flange portion of the drum core in the same embodiment; (a) and (b) are explanatory diagrams for explaining the flange portion and the ridge line portion of the plate-shaped core in the same embodiment. The perspective view of the coil component in 2nd Embodiment. The perspective view of the drum core in the same embodiment. Sectional drawing for demonstrating the relationship between the slope and the coil in the same embodiment. The perspective view of the coil component in 3rd Embodiment. The perspective view of the drum core in the same embodiment. The perspective view of the coil component in a modification. FIG. 5 is a cross-sectional view showing a plating structure in a flange portion of a drum core in a modified example;

(First embodiment)
The first embodiment will be described below. It should be noted that the attached drawings may show constituent elements on an enlarged scale for easy understanding. The dimensional proportions of components may differ from those in reality or in other drawings.

As shown in FIG. 1, the coil component 10 is, for example, a common mode choke coil. The coil component 10 has a drum core 11 , a plate-like core 41 attached to the drum core 11 , and first and second wires 51 and 52 wound around the drum core 11 .

As shown in FIG. 1 , the drum core 11 has a rectangular parallelepiped winding core 21 and a pair of flanges 31 provided at both ends of the winding core 21 . The core portion 21 and the pair of flange portions 31 are integrally formed.

Here, in this specification, as shown in FIGS. The orthogonal direction in which the plate-like core 41 and the flange portion 31 of the drum core 11 abut is defined as the "height direction (thickness direction) Td", and the "length direction Ld" and the "height direction Td" are defined. A direction perpendicular to both is defined as a “width direction Wd”.

The drum core 11 of this example is made of a magnetic material such as NiCuZn ferrite.
As shown in FIGS. 1 and 2, the winding core 21 has first and second wires 51 and 52 wound around it.

The winding core portion 21 is formed, for example, in a rectangular parallelepiped shape extending in the length direction Ld. The central axis of the winding core 21 extends substantially parallel to the length direction Ld. The core portion 21 has a pair of main surfaces 21a and 21b facing each other in the height direction Td and a pair of side surfaces 21c and 21d facing each other in the width direction Wd. Here, the principal surfaces 21a and 21b are defined as the principal surface 21a on the side other than the planar core 41 side in the height direction Td, and the principal surface 21b on the planar core 41 side in the height direction Td.

In this specification, the term "rectangular parallelepiped" includes a rectangular parallelepiped with chamfered (C-chamfered) corners and ridges, a rectangular parallelepiped whose corners and ridges are rounded so that the corners and ridges are appropriately rounded, corners and rectangular parallelepipeds with concave ridges are assumed to be included. In addition, unevenness or the like may be formed on part or all of the main surface and side surfaces. 5(a) to 5(d) show an example of the cross-sectional shape of the winding core 21. FIG. The winding core portion 21 shown in FIG. 5(a) has a corner portion 21f with a square recess. The core portion 21 shown in FIG. 5(b) is chamfered so that the corners 21f are curved. The winding core portion 21 shown in FIG. 5(c) has a shape in which the corners 21f are chamfered (C surface shape). The winding core 21 shown in FIG. 5(d) is configured to have an octagonal (non-regular octagonal) cross section. In any configuration, when wires 51 and 52, which will be described later, are wound around the core portion 21, compared with the configuration in which the cross section is rectangular (the corners are 90 degrees), the wire 51 positioned at the corner 21f , 52 are obtuse angles. Therefore, the wires 51 and 52 are prevented from being bulged and can be wound closer to the winding core 21 than when the winding core is rectangular (rectangular).

As shown in FIGS. 1 to 4, each pair of flanges 31 is formed in a rectangular parallelepiped shape that is short in the length direction Ld. Each flange 31 is formed to protrude around the winding core 21 in the height direction Td and the width direction Wd. Specifically, the planar shape of each collar portion 31 when viewed from the length direction Ld is formed so as to protrude from the winding core portion 21 in the height direction Td and the width direction Wd.

Each flange 31 has a pair of main surfaces 31a and 31b facing each other in the length direction Ld, a pair of side surfaces 31c and 31d facing each other in the width direction Wd, and a pair of side surfaces 31e facing each other in the height direction Td. , 31f. A main surface 31a of each flange 31 faces the side opposite to the winding core 21 in the length direction Ld (outside the drum core 11 in the length direction Ld). Here, the main surface 31 a of the flange portion 31 corresponds to the end surface of the flange portion 31 . A main surface 31b of each flange portion 31 faces the core portion 21 side in the length direction Ld (the inner side of the drum core 11 in the length direction Ld). That is, the main surfaces 31b of the flange portions 31 correspond to opposing surfaces that face each other.

Each flange 31 has two mounting surfaces 32a and 32b separated from each other on the side 31f to be mounted on a board (not shown), a central depression 33 separating the two mounting surfaces 32a and 32b, and the central depression 33. have outer recessed portions 34a, 34b, respectively, adjacent to mounting surfaces 32a, 32b on opposite sides thereof. The mounting surfaces 32a and 32b are configured to protrude in the height direction Td more than the central recessed portion 33 and the outer recessed portions 34a and 34b. In this example, the distance from the mounting surfaces 32a and 32b to the main surface 21a of the winding core 21 is set to about 0.1 to 0.5 mm.

Each flange 31 also has a slope 35 . The slope 35 is a linear slope that continues from the end of the main surface 21a in the axial direction of the winding core 21 to the outer recessed portion 34b of the flange 31 with almost no steps. The inclination angle of the slope 35 of this example is set in the range of 5 to 20 degrees with respect to the width direction Wd of the main surface 21a of the winding core 21, and is about 14 degrees as shown in FIGS. 1 to 4. is preferred. Here, for example, if the inclination angle of the slope 35 is low, the wires 51 and 52 are easily lifted from the slope 35, and if the inclination angle of the slope 35 is high, the wires 51 and 52 are less likely to be loaded after crimping. By doing so, the wires 51 and 52 can be floated and an appropriate load can be applied to the wires 51 and 52 .

As shown in FIG. 3 , when each flange 31 is viewed from the side (when viewed from the length direction Ld, which is the direction in which the flanges 31 are arranged side by side), the slope 35 is formed by the main surface 31 a of the flange 31 . It is in a hidden position. That is, the slope 35 is positioned closer to the winding core 21 than the central recess 33 in the height direction Td. In addition, since the first and second wires 51 and 52 are hidden by the main surface 31a, which is the end surface on the opposite side of the main surface 31b, which is the facing surface of the flange 31 when viewed from the direction in which the flanges are arranged side by side, For example, the resin can be prevented from contacting the first and second wires 51 and 52 during molding, and the first and second wires 51 and 52 can be prevented from being pulled even by impact or expansion/contraction of the mold resin. disconnection can be prevented. Furthermore, the slope 35 is hidden when viewed from a direction parallel to the mounting surfaces 32a and 32b. With such a configuration, exposure of the wires 51 and 52 (drawer portions 51b and 52b to be described later) in the same direction is suppressed.

Also, the slope 35 is formed so as to gradually widen from the core portion 21 side to the flange portion 31 (the outer recessed portion 34b).
Electrodes 36a and 36b are formed on the mounting surfaces 32a and 32b and the outer recessed portions 34a and 34b of one collar portion 31, respectively. More specifically, the electrode 36a is formed over the adjacent mounting surface 32a and the outer recessed portion 34a, and the electrode 36b is formed over the adjacent mounting surface 32b and the outer recessed portion 34b. there is Moreover, the mounting surfaces 32a and 32b are in a non-conducting state due to the central recessed portion 33. As shown in FIG. Thereby, two electrodes 36 a and 36 b are formed on one collar portion 31 .

Terminal electrodes 36a and 36b are formed on the mounting surfaces 32a and 32b and the outer recessed portions 34a and 34b of the other collar portion 31, respectively. More specifically, the electrode 36a is formed over the adjacent mounting surface 32a and the outer recessed portion 34a, and the electrode 36b is formed over the adjacent mounting surface 32b and the outer recessed portion 34b. there is Moreover, the mounting surfaces 32a and 32b are in a non-conducting state due to the central recessed portion 33. As shown in FIG. Thereby, two electrodes 36 a and 36 b are formed on the other collar portion 31 .

The electrode 36a of one collar portion 31 is located on the opposite side of the electrode 36a of the other collar portion 31 in the width direction Wd. The electrode 36b of one collar portion 31 is located on the opposite side of the electrode 36b of the other collar portion 31 in the width direction Wd. Moreover, the electrode 36b is positioned on the side of the outer recessed portion 34b, that is, on the terminal side of the slope 35, as described above. The electrodes 36a and 36b of each collar portion 31 are shown with a dot pattern (satin pattern) in each drawing.

Lead portions 51a, 51b, 52a, and 52b of first and second wires 51 and 52, which will be described later, are electrically connected to the respective electrodes 36a and 36b.
As shown in FIGS. 3 and 4, the flange portion 31 has a curved surface shape in which ridgeline portions 31h and 31i around a side surface 31e opposite to the surface on which the electrodes 36a and 36b are formed are chamfered. there is

Specifically, as shown in FIG. 7A, the ridgeline portion 31h includes an extension surface SL1 along the main surface 31a of the flange portion 31 and a side surface 31e of the flange portion 31. The shape is recessed toward the center of the flange 31 from the imaginary ridge where the extension surface SL2 along the side surface 31e intersects. In other words, the ridgeline portion 31h of the flange portion 31 is recessed toward the center of the flange portion 31 compared to the case where the cross-sectional angle of the ridgeline portion is 90 degrees.

Further, as shown in FIG. 7B, the ridgeline portion 31i extends over the side surfaces 31c and 31d of the collar portion 31 and extends along the side surfaces 31c and 31d, and extends over the side surface 31e of the collar portion 31. The shape is recessed toward the center of the flange 31 from the imaginary ridge line based on the extension surface SL4 along the side surface 31e. That is, the ridgeline portion 31i of the flange portion 31 is recessed toward the center of the flange portion 31 as compared with the case where the ridgeline portion is formed with a so-called pin angle. The ridges 31h and 31i of this example have a curvature radius of, for example, 30 μm or more and 100 μm or less.

As described above, each of the ridgeline portions 31h and 31i is recessed, so that spaces S1 and S2 are present in the ridgeline portions 31h and 31i when an adhesive applied during manufacturing, which will be described later, flows. S1 and S2 act as reservoirs for reserving the adhesive, and it is possible to suppress the adhesive from flowing out to the outside. It should be noted that it is not always necessary to store the adhesive in the spaces S1 and S2 as the storage portions.

A length dimension L1 along the length direction Ld of the drum core 11 configured as described above is set within a range of about 1.2 to about 4.5 mm. Further, the height dimension along the height direction Td of the drum core 11 (the height dimension from the mounting surfaces 32a, 32b of the flange 31 to the side surface 31e along the height direction Td) T1 is about 0.5 to about It is set in the range of 2.1 mm. A width dimension W1 along the width direction Wd of the drum core 11 (a width dimension along the width direction Wd of the flange portion 31) W1 is set within a range of 1.0 to 3.2 mm.

As shown in FIGS. 1 to 4, the plate-shaped core 41 is adhered and fixed with an adhesive so as to straddle the pair of flanges 31, for example. The plate-like core 41 can be made of a magnetic material or a non-magnetic material. By providing the plate-like core 41, it becomes easy to pick up the coil component 10 with the suction nozzle of the automatic mounting machine when mounting it on the substrate. In addition, when the plate-shaped core 41 is made of a magnetic material such as ferrite, the drum core 11 and the plate-shaped core 41, which are also made of ferrite, can form a closed magnetic circuit. I can expect it.

A length dimension L4 along the length direction Ld of the plate-shaped core 41 of this example is slightly longer than the length dimension L1 of the drum core 11 . A height dimension T3 along the height direction Td of the plate-shaped core 41 is set within a range of 0.15 to 1.0 mm. A width dimension W3 along the width direction Wd of the plate-like core 41 is slightly longer than the width dimension W1 of the drum core 11 (flange 31).

Here, the change in the L value due to the difference between the length dimension L4 of the plate-shaped core 41 and the length dimension L1 of the drum core 11 will be described. As shown in Tables 1 and 2 below, when the length L4 of the plate-shaped core 41 is shortened by 0.1 mm from the length L1 of the drum core 11 ("-0.1" in Table 1). ), when the length is the same, and when the length is increased by 0.1 mm (“0.1” in Table 1). The amount of change in the value and the rate of change (%) were investigated. The amount of displacement in the length direction Ld indicates the case where there is no displacement and the case where the position is shifted by 0.1 mm from the predetermined position (the position where there is no displacement), and both of the pair of flanges 31 are shifted by 0.1 mm. Therefore, it is indicated as "0.2" in Table 1 because there is a total deviation of 0.2 mm.

As can be seen from Tables 1 and 2, when the length dimension L4 of the plate-shaped core 41 is longer than the length dimension L1 of the drum core 11, the drum core and the plate-shaped core are relative to each other with respect to the length direction Ld. Even if there is a shift, the value of the L value is almost unchanged. Therefore, as described above, the length L4 of the plate-like core 41 is longer than the length L1 of the drum core 11, or the width W3 of the plate-like core 41 is longer than the width W1 of the drum core 11. Therefore, even if the length L1 of the drum core or the width W1 of the drum core becomes longer within the range of dimensional tolerance, the contact between the drum core 11 (flange 31) and the plate-shaped core 41 is prevented. Since a sufficient area can be secured, variations in the L value due to dimensional tolerance can be suppressed.

As shown in FIGS. 3 and 4, the ridgeline portions 41a and 41b of the plate-shaped core 41 are recessed (notched).
Specifically, as shown in FIG. 7A, the ridgeline portion 41a includes an extension surface SL5 along the main surface 42 of the plate-like core 41 and an end surface of the plate-like core 41. It has a shape recessed toward the center of the plate-shaped core 41 from an imaginary ridgeline portion based on an extension surface SL6 along the end face 43 passing over the plate-shaped core 43 . That is, the ridgeline portion 41a of the plate-like core 41 is recessed toward the center of the plate-like core 41 compared to the case where the ridgeline portion has a so-called pin angle.

Further, as shown in FIG. 7B, the ridgeline portion 41b extends along the main surface 42 of the plate-shaped core 41 and extends along the main surface 42, and extends over the side surface 44 of the plate-shaped core 41. The shape is recessed toward the center of the plate-like core 41 from the imaginary ridgeline portion where the extension surface SL7 along the side surface 44 intersects. That is, the ridgeline portion 41a of the plate-like core 41 is recessed toward the center of the plate-like core 41 compared to the case where the cross-sectional angle of the ridgeline portion is 90 degrees.

As described above, the ridgeline portions 41a and 41b are recessed so that the spaces S3 and S4 exist in the ridgeline portions 41a and 41b when the adhesive flows. It acts as a reservoir to store and can suppress the adhesive from flowing out to the outside. It should be noted that the spaces S3 and S4 serving as storage portions do not necessarily store the adhesive.

Moreover, it is preferable that the storage areas Ar1 and Ar3 of the spaces S1 and S2 of the edge line portions 31h and 31i are larger than the storage areas Ar2 and Ar4 of the spaces S3 and S4 of the edge line portions 41a and 41b. Each storage area Ar1 to Ar4 means the area of each space S1 to S4 when the drum core 11 and plate-shaped core 41 are cut in the direction including the ridges 31h, 31i, 41a, and 41b. The ridge line portions 31h, 31i, 41a, and 41b may be molded in advance in the shapes shown in the respective drawings, or may be formed by post-processing such as polishing. With such a configuration, a large amount of adhesive can be introduced into the space on the side of the drum core 11 (flange 31). Since the length dimension L4 of the plate-shaped core 41 is longer than the length dimension L1 of the drum core 11, by guiding the adhesive to the drum core 11 side, it is possible to suppress an unintended increase in the length dimension of the coil component 10. can. Further, since the width dimension W3 of the plate-shaped core 41 is longer than the width dimension W1 of the flange portion 31 of the drum core 11, by guiding the adhesive toward the drum core 11 side, an unintended increase in the width dimension of the coil component 10 can be suppressed. can be done.

The first and second wires 51 and 52 are covered electric wires, and are wound around the winding core portion 21 in the same winding direction to form coil conductors. The first and second wires 51 and 52 may each have a diameter in the range of, for example, about 15 to about 80 μm, and as an example, a coated wire with a diameter of about 15 μm is used. The first and second wires 51 and 52 are wound around the winding core 21 so as to have the same number of turns. In this example, for example, the first and second wires 51 and 52 are wound with 16 turns each (32 turns in total).

One terminal of the first wire 51, which is a lead portion 51a, is connected to the electrode 36a of one collar portion 31, and the other terminal of the first wire 51, which is a lead portion 51b, is connected to the other terminal of the flange portion 31. It is connected with the electrode 36b. At this time, the drawer portion 51b has a shape along the slope 35 .

One end of the second wire 52, the lead portion 52a, is connected to the electrode 36b of one collar portion 31, and the other end of the second wire 52, the lead portion 52b, is connected to the electrode 36a of the other collar portion 31. connected with At this time, the drawer portion 52b has a shape along the slope 35. As shown in FIG.

Next, a method for manufacturing the coil component 10 configured as described above will be described.
First, the drum core 11 is formed using a mold.
Next, electrodes 36a and 36b are formed on the mounting surfaces 32a and 32b and the outer recessed portions 34a and 34b of each collar portion 31, respectively. The electrodes 36a and 36b can be formed by screen printing or dry plating Ag (silver) or the like on the mounting surfaces 32a and 32b of each collar portion 31 and the outer recess portions 34a and 34b. At this time, for the mounting surfaces 32a and 32b and the outer recessed portions 34a and 34b, a method of performing screen printing in two steps or a method of using both screen printing and dry plating can be used. At this time, the thickness of the electrodes 36a, 36b on the mounting surfaces 32a, 32b and the outer recesses 34a, 34b is set to approximately 0.1 to 0.5 μm in the case of dry plating, and approximately 0.5 μm in the case of screen printing. It is set from 10 μm to about 30 μm.

Next, electrodes 36 a and 36 b are formed on the main surface 31 a (end surface) of the collar portion 31 . At this time, the electrodes 36a and 36b formed on the mounting surfaces 32a and 32b and the outer recessed portions 34a and 34b are formed to be electrically connected. The electrodes 36a and 36b can be formed by screen-printing or dry-plating Ag on the main surface 31a (end surface) of each flange 31, for example. The thickness of the electrodes 36a and 36b on the main surface 31a (end surface) at this time is set to about 0.1 to about 0.5 μm in the case of dry plating, and about 10 μm to about 30 μm in the case of screen printing. set.

Then, plating treatment is applied. In this example, plating is performed in the order of Cu (copper) plating, Ni (nickel) plating, and Sn (tin) plating. That is, as shown in FIG. 6, the collar portion 31 has a Cu plating layer 72, a Ni plating layer 73, and an Sn plating layer 74 formed on an Ag layer 71 forming electrodes 36a and 36b in order from the outer recessed portions 34a and 34b. 3 layers of plating are applied. A new Cu plating layer may be provided between the Ni plating layer 73 and the Sn plating layer 74 . The thickness of each layer by each plating process is set in the range of about 0.5 to about 15 μm, more preferably in the range of about 1 to 10 μm. Note that Au (gold) may be used instead of Sn.

Next, the first and second wires 51, 52 are prepared. For the first and second wires 51 and 52, wires containing Cu, such as CuNi alloy wires containing Ni, can be employed. Also, a resin material such as imide-modified polyurethane can be used for the coating. As a result, Cu erosion of the wires 51 and 52 by the Sn plating layer 74 during thermocompression bonding can be suppressed.

Next, the first and second wires 51 and 52 are wound around the winding core portion 21 .
Next, the coatings on the lead portions 51a, 51b, 52a, 52b of the first and second wires 51, 52 are peeled off as necessary. Although the peeling method is not particularly limited, for example, laser can be used for peeling. In addition, this step can be omitted if, for example, the coating material does not require peeling.

Next, the electrodes 36a, 52b of the first and second wires 51, 52 are pulled parallel to the surfaces of the outer recesses 34a, 34b, and the electrodes 36a, 52b of the outer recesses 34a, 34b are attached by, for example, crimping. 36b. Although the compression bonding method is not particularly limited, for example, thermocompression bonding using a heater chip can be adopted. At this time, the amount of crushing of the wires 51, 52 (leading portions 51a, 51b, 52a, 52b) during crimping is less than 50%. At this time, the lead portions 51a, 51b, 52a, and 52b of the wires 51 and 52 may come into contact with the Cu plating layer 72 across at least the Sn plating layer 74 and the Ni plating layer 73 due to the thermocompression bonding by the heater chip. preferable. In this case, even if Cu erosion occurs, Cu can be supplied from the Cu plating layer 72 to the wires 51 and 52. Therefore, the thinning of the wires 51 and 52 can be suppressed and disconnection of the wires 51 and 52 can be suppressed. is suppressed.

Next, the ends of the lead portions 51a, 51b, 52a, 52b of the first and second wires 51, 52 are cut. At this time, the ends of the lead-out portions 51a, 51b, 52a, 52b of the first and second wires 51, 52 should be cut in a state in which they extend (protrude) from either the main surface 31a or the side surfaces 31c, 31d. is preferred. Further, it is more preferable that the ends of the drawn-out portions 51a, 51b, 52a, 52b after cutting are in a state along either the main surface 31a or the side surfaces 31c, 31d. As described above, since the ends of the first and second wires 51 and 52 extending from either the main surface 31a or the side surfaces 31c and 31d are cut, the cutting is performed outside the drum core 11, which facilitates cutting. becomes. Furthermore, by forming the ends of the cut lead portions 51a, 51b, 52a, 52b along the drum core 11, the effect on the dimensions of the coil component 10 as a whole can be reduced. In addition, since the ends of the lead portions 51a, 51b, 52a, 52b extend to the main surface 31a and the side surfaces 31c, 31d, the wires 51, 52 and the Sn plating layer 74 do not come into contact with each other.

Next, the plate-like core 41 is attached to the drum core 11 . Specifically, a resin is applied as an adhesive to the side surface 31e of the collar portion 31 by dispensing or pin transfer. Then, the plate-like core 41 can be brought into contact with the resin-applied side surface 31e and attached.

Next, the operation of the structure of the coil component 10 will be described.
In the coil component 10 of the present embodiment, the slope 35 is provided on the main surface 31b side of the collar portion 31, and the lead portions 51b and 52b are guided along the slope 35, that is, the lead portions 51b and 52b are connected to the slope 35. It has a shape along the This prevents the drawer portions 51b and 52b from bending. In addition, since the slope 35 is hidden by the flange 31 (main surface 31a) in side view, the drawer portions 51b and 52b are naturally hidden by the flange 31 (main surface 31a) in side view. As a result, the resin during molding, for example, can be prevented from coming into contact with the first and second wires 51 and 52, and the first and second wires 51 and 52 will be pulled even if there is an impact or expansion/contraction of the mold resin. disconnection can be prevented.

In addition, since the lead-out portions 51a, 51b, 52a, 52b are provided in the outer recessed portions 34a, 34b at positions recessed from the mounting surfaces 32a, 32b, the lead-out portions 51a, 51b, 52a, 52b are located on the substrate when mounted. It is possible to prevent disconnection because it is possible to prevent the user from touching the wire.

Furthermore, by covering the electrodes 36a and 36b with the Cu plating layer 72, the Ni plating layer 73, and the Sn plating layer 74 in this order, the Sn plating layer 74 having good solder wettability can be provided when the coil component 10 is mounted on the substrate. , the bondability between the electrodes 36a and 36b and the substrate (land of the substrate) is improved. Further, for example, if only the Ag layer 71 is plated with Sn, the Sn melts and the Ag layer 71 is exposed, causing ion migration of Ag between the two electrodes 36a and 36b, which poses a risk of short circuit. Therefore, covering the electrodes 36a and 36b with the Ni plating layer 73 has the effect of preventing Ag from moving, so that short-circuiting as described above can be suppressed. Here, since the Ni in the Ni plating layer 73 has a high residual stress, there is a possibility that the Ag layer 71 constituting the electrodes 36 a and 36 b may peel off from the drum core 11 . Therefore, by interposing a relatively soft Cu plating layer 72 between the Ni plating layer 73 and the Ag layer 71 forming the electrodes 36a and 36b, it is possible to relax the stress. In addition, the coil component 10 has a ridgeline portion 31h. Spaces S1 and S2 are provided in 31i, and spaces S3 and S4 are provided in the ridges 41a and 41b of the plate-like core 41, so that the adhesive can be stored in the spaces S1, S2, S3 and S4. there is Since the adhesive is stored in the spaces S1, S2, S3, and S4, it is possible to suppress the external dimensions of the coil component 10 from being affected, thereby suppressing deterioration of the external shape and suppressing an unintended increase in the size of the coil component 10. It is

As described above, according to this embodiment, the following effects are obtained.
(1) By providing the slope 35 for guiding the lead-out portions 51b and 52b to the electrode 36b in the flange portion 31, the bending of the wires 51 and 52 (lead-out portions 51b and 52b) is suppressed, and disconnection of the wires 51 and 52 is suppressed. can be done.

(2) By providing slopes 35 on both of the pair of flanges 31, bending of the lead portions 51b and 52b of the first and second wires 51 and 52 connected to the electrodes 36b of the flanges 31 can be reduced. It is possible to suppress disconnection of the first and second wires 51 and 52 by suppressing.

(3) The first and second wires 51 and 52 are hidden by the main surface 31a on the side opposite to the main surface 31b, which is the facing surface of the flange when viewed from the length direction Ld, which is the direction in which the flange 31 is arranged side by side. For example, after mounting the coil component 10 on the substrate, when the periphery of the coil component 10 is molded with resin or the like, the resin flows from the collar portion 31 side and the first and second wires 51 and 52 are molded. Reaching of the resin is suppressed. Here, for example, if the mold resin reaches the first and second wires 51 and 52, the first and second wires 51 and 52 may be pulled and disconnected due to expansion and contraction of the mold resin due to thermal shock. . Therefore, as described above, the mold resin is suppressed from reaching the first and second wires 51 and 52, thereby suppressing breakage of the first and second wires 51 and 52. FIG.

(4) The slope 35 is hidden when viewed from the width direction Wd, which is perpendicular to the length direction Ld, which is the direction in which the flanges 31 are arranged, and the height direction Td, which is the direction in which the electrodes 36a and 36b face each other. , exposure of the wires 51 and 52 (leading portions 51b and 52b) in the same direction is suppressed.

(5) Since the lead-out portions 51b and 52b are provided linearly along the slope 35, bending of the lead-out portions 51b and 52b is eliminated, and breakage of the wires 51 and 52 (lead-out portions 51b and 52b) can be suppressed. can.

(6) By covering the electrodes 36a and 36b in the order of the Cu plating layer 72, the Ni plating layer 73, and the Sn plating layer 74, a relatively soft layer is formed between the Ni plating layer 73 and the electrodes 36a and 36b (Ag layer 71). By interposing the Cu plating layer 72, the stress can be relaxed.

(7) The lead portions 51 a , 51 b , 52 a , 52 b of the wires 51 , 52 are in contact with the Cu plating layer 72 . Then, even if the so-called Cu erosion caused by using thermocompression bonding occurs when electrically connecting the lead-out portions 51a, 51b, 52a, 52b to the electrodes 36a, 36b as in this example, the Cu plating layer 72 Since Cu is supplied, thinning of the wires 51 and 52 is suppressed. As a result, it can contribute to improvement of the bonding state of the wires 51 and 52 .

(8) By setting the thickness of each plating layer in the range of 1 to 10 μm, it becomes possible to strengthen the crimping of the wire.
(9) Since the lead portions 51a, 51b, 52a, 52b of the wires 51, 52 extend to the main surface 31a and the side surfaces 31c, 31d of the collar portion 31, the ends of the lead portions 51a, 51b, 52a, 52b are Sn Contact with the plated layer 74 can be suppressed. Therefore, Cu can be supplied to the lead portions 51a, 51b, 52a, and 52b of the crimped portions at the ends (portions not in contact with the Sn plating layer 74) of the lead portions 51a, 51b, 52a, and 52b.

(10) By providing the spaces S1, S2, S3, and S4 as storage portions for storing the adhesive, even if the adhesive flows to the outside when the plate-like core 41 and the drum core 11 are adhered and fixed, It can be stored in spaces S1, S2, S3, and S4 located at ridges 31h, 31i, 41a, and 41b. Therefore, it is possible to prevent the adhesive from spilling outside the outer dimensions of the plate-like core 41 and the drum core 11, to prevent the deterioration of the external shape, and to prevent the coil component 10 from being unintentionally increased in size.

(11) When the length dimension L4 of the plate-shaped core 41 is made longer than the length dimension L1 of the flange portion 31, the contact position between the plate-shaped core 41 and the flange portion 31 shifts in the length direction. However, the plate-shaped core 41 and the flange portion 31 can be reliably brought into contact with each other, and variations in the L value can be suppressed.

(12) By making the width dimension W3 of the plate-like core 41 longer than the width dimension W1 of the flange portion 31, even if the contact position between the plate-like core 41 and the flange portion 31 is shifted in the width direction, the flange portion An increase in the size of the coil component 10 due to the portion 31 protruding outside the plate-like core 41 can be suppressed. Furthermore, the plate-like core 41 and the flange portion 31 can be reliably brought into contact with each other, and variations in the L value can be suppressed.

(13) Since spaces S1 to S4 are provided as reservoirs in both the pair of flanges 31 and plate-shaped core 41, the adhesive is stored in spaces S1 to S4 of both flanges 31 and plate-shaped core 41. be able to.

(14) By making the storage areas of the spaces S1 and S2 of the flange 31 larger than the storage areas of the spaces S3 and S4 of the plate-like core 41, more adhesive can flow to the flange 31 side. Further, as described above, the length and width of the plate-like core 41 are longer than the length and width of the flange portion, so that the flange portion 31 is positioned relatively inward. Even if a large amount of adhesive is flowed, it is possible to prevent the plate-like core 41 from becoming larger than the external dimensions.

(15) The ridges 41a and 41b of the plate-like core 41 are recessed to prevent the coil component 10 from being unintentionally increased in size.
(16) By setting the radius of curvature of the ridges 31h and 31i to 30 μm or more, leaking adhesive can be sufficiently retained, and by setting the radius of curvature to 100 μm or less, the bonding strength between the collar portion 31 and the plate-like core 41 can be ensured. can be done.

(Second embodiment)
The second embodiment will be described below with reference to FIGS. 8 to 10. FIG. The following description will focus on differences from the first embodiment.

As shown in FIGS. 8 and 9, the drum core 11 of the coil component 10 of the present embodiment is different in that the slope 35 is provided with grooves 35a.
As shown in FIGS. 8 to 10, the groove portion 35a provided in the slope 35 has a semicircular cross section, and is shaped so that a part of the lead portions 51b and 52b of the first and second wires 51 and 52 can be inserted. have As a result, the displacement of the drawer portions 51b and 52b is suppressed, and the drawer portions 51b and 52b can be reliably guided. The groove portion 35a has a depth of ⅓ or more, more preferably ½ or more, of the diameters of the first and second wires 51 and 52 . The inclination angle of the slope 35 in this example is set in the range of 5 to 20 degrees with respect to the width direction Wd of the main surface 21a of the winding core 21, and is shown as about 10 degrees in FIGS. ing. Also, the first and second wires 51 and 52 can each have a diameter in the range of, for example, about 15 to about 80 μm, and in this example, a coated wire with a diameter of about 30 μm is used.

Next, the operation of the coil component 10 will be described.
In the coil component 10 of the present embodiment, the slope 35 is formed with grooves 35a along which the lead-out portions 51b and 52b of the first and second wires 51 and 52 are aligned.

As described above, according to the present embodiment, the following effects are obtained in addition to the effects (1) to (16) of the first embodiment.
(17) The slope 35 is provided with the grooves 35a into which the lead-out portions 51b and 52b are fitted, so that the lead-out portions 51b and 52b are more reliably guided, the deflection of the lead-out portions 51b and 52b is suppressed, and the wires 51 and 52 (leader Disconnection of the portions 51b, 52b) can be suppressed.

(Third embodiment)
The third embodiment will be described below with reference to FIGS. 11 and 12. FIG. The following description focuses on differences from the first and second embodiments.

As shown in FIGS. 11 and 12, the drum core 11 of the coil component 10 of the present embodiment is different in that a wall portion 61 flush with the mounting surfaces 32a and 32b is provided in the central recess portion 33 of the flange portion 31. . The wall portion 61 is provided so as to connect the mounting surfaces 32 a and 32 b in the central hollow portion 33 . As a result, it is possible to suppress the inflow of resin from the central recessed portion 33 when the entire coil component 10 or the entire substrate is molded with a resin or the like for insulating coating. The distance from the mounting surfaces 32a and 32b of the drum core 11 to the main surface 21a of the winding core 21 is set to about 0.1 to about 0.5 mm.

The angle of the slope 35 of the drum core 11 configured as described above is set in the range of 5 to 20 degrees with respect to the width direction Wd of the main surface 21a of the winding core 21. In FIGS. It shows 5.5 degrees.

As described above, according to the present embodiment, the following effects are obtained in addition to the effects (1) to (17) of the first and second embodiments.
(18) The wall portion 61 is provided so as to connect the mounting surfaces 32 a and 32 b in the central hollow portion 33 . As a result, it is possible to suppress the inflow of resin from the central recessed portion 33 when the entire coil component 10 or the entire substrate is molded with a resin or the like for insulating coating. Therefore, it is possible to reduce the influence on the wires 51 and 52 (leading portions 51b and 52b) and prevent disconnection.

In addition, you may implement each said embodiment in the following aspects.
- In each of the above embodiments, both of the pair of flanges 31 are provided with the slopes 35 , but only one of the pair of flanges 31 may be provided with the slopes 35 .

- In each of the above-described embodiments, the slope 35 is configured to gradually widen from the core portion 21 side to the flange portion 31, but this is not restrictive. For example, a configuration in which the width is uniform from the core portion 21 side to the flange portion 31, or a configuration in which the width is narrow from the core portion 21 side to the flange portion 31 may be adopted.

- In each of the above embodiments, the slope 35 is a linear inclined surface, but it may be a curved inclined surface.
- In the above-described third embodiment, the wall portion 61 is provided in the central recessed portion 33 so that the mounting surfaces 32a and 32b and the wall portion 61 are flush with each other, but the present invention is not limited to this. For example, as shown in FIG. 13, a configuration without the central depression 33 may be employed. Even with such a configuration, the same effect as (6) can be obtained.

- In each of the above-described embodiments, the length dimension L4 of the plate-shaped core 41 is longer than the length dimension L1 of the drum core 11, but this is not restrictive. For example, a configuration in which the length dimension L4 of the plate-shaped core 41 and the length dimension L1 of the drum core 11 are the same, or a configuration in which the length dimension L1 of the drum core 11 is longer than the length dimension L4 of the plate-shaped core 41 is adopted. may

- In each of the above embodiments, the width dimension W3 of the plate-like core 41 is longer than the width dimension W1 of the flange portion 31 of the drum core 11, but this is not restrictive. For example, a configuration in which the width dimension W3 of the plate-shaped core and the width dimension W1 of the flange portion 31 of the drum core 11 are the same, or a configuration in which the width dimension W1 of the drum core 11 is longer than the width dimension W3 of the plate-shaped core 41 is adopted. good too.

- In each of the above embodiments, the Cu plating layer 72, the Ni plating layer 73, and the Sn plating layer 74 are plated in this order on the Ag layer 71 that constitutes the electrode, but an intermediate Cu plating layer is added. configuration may be employed.

As shown in FIG. 14, an intermediate Cu plating layer 75 is arranged between the Ni plating layer 73 and the Sn plating layer 74 . By adopting such a configuration, the wire is brought into contact with Cu more reliably, so that thinning of the wire can be suppressed.

- Although the ridgeline portions 41a and 41b of the plate-like core 41 are recessed in the above-described embodiment, the present invention is not limited to this. For example, the ridges 41a and 41b may be curved or C-shaped.
- You may combine the above-mentioned embodiment and each modification suitably.

DESCRIPTION OF SYMBOLS 10... Coil component 11... Drum core (core) 21... Core part 31... Flange part 31h, 31i... Ridge part 32a, 32b... Mounting surface 35... Slope 35a... Groove part 36a, 36b... Electrode , 41... plate-shaped core, 41a, 41b... ridge line portion, 51... first wire (wire), 51a, 51b... lead portion, 52... second wire (wire), 52a, 52b... lead portion, 72... Cu plating Layer, 73... Ni plating layer, 74... Sn plating layer, 75... Intermediate Cu plating layer, Ar1, Ar2, Ar3, Ar4... Storage area, S1, S2, S3, S4... Space (storage part), SL1, SL2, SL3, SL4, SL5, SL6, SL7 . . . extended surfaces.

Claims (3)

A drum core having a core and a pair of flanges provided at both ends of the core; electrodes provided on each of the pair of flanges; and a lead portion wound around the core. a wire electrically connected to the electrode, and a plate-like plate-like core adhered and fixed so as to straddle the pair of flanges,
When the direction in which the pair of flanges are aligned is taken as the length direction, and the direction in which the plate-like core and the flanges abut is taken as the height direction,
The flange has a main surface facing away from the winding core in the length direction, a side surface facing the plate-shaped core in the height direction, a main surface of the flange and the flange. a first reservoir for storing the adhesive, wherein the ridgeline between the side surfaces of the ridgeline is located inside the imaginary ridgeline where the extended surfaces of both sides intersect the ridgeline and stores the adhesive;
The plate-shaped core has a main surface facing the flange in the height direction, an end surface facing the same side as the main surface of the flange in the length direction, a main surface of the plate-shaped core, and the main surface of the flange. a second reservoir for storing the adhesive, the ridge between the end faces of the plate-shaped core being located inside the imaginary ridge where the extended surfaces of both surfaces sandwiching the ridge are intersected;
The ridgeline portion of the plate-like core has a shape recessed toward the winding core portion side in the length direction,
In the length direction, the core-side end of the ridge of the plate-shaped core is farther from the core than the core-side end of the ridge of the flange. is located in
The coil component, wherein the ridge portions of the pair of flange portions are curved surfaces having a radius of curvature of 30 μm or more and 100 μm or less. A drum core having a core and a pair of flanges provided at both ends of the core; electrodes provided on each of the pair of flanges; and a lead portion wound around the core. a wire electrically connected to the electrode, and a plate-like plate-like core adhered and fixed so as to straddle the pair of flanges,
The direction in which the pair of flanges are arranged is defined as the length direction, the direction in which the plate-shaped core and the flanges contact each other is defined as the height direction, and the direction perpendicular to both the length direction and the height direction is defined as In the width direction,
The collar portion has a first side surface facing one side in the width direction, a second side surface facing the plate-shaped core in the height direction, the first side surface of the collar portion, and the a first reservoir for storing the adhesive, wherein the ridgeline between the second side surfaces is located inside the imaginary ridgeline where the extended surfaces of both surfaces sandwiching the ridgeline intersect;
The plate-like core has a main surface facing the flange portion in the height direction, a side surface facing the same side as the first side surface of the flange portion in the width direction, a main surface of the plate-like core, and the main surface of the plate-like core. a second reservoir for storing the adhesive, the ridgeline portion between the side surfaces of the plate-shaped core being located inside the imaginary ridgeline portion where the extended surfaces of both surfaces sandwiching the ridgeline portion intersect;
The ridgeline portion of the plate-shaped core has a shape recessed toward the winding core portion side in the width direction,
In the width direction, the core-side end of the ridge of the plate-like core is positioned farther from the core than the core-side end of the ridge of the flange. is located
The coil component, wherein the ridge portions of the pair of flange portions are curved surfaces having a radius of curvature of 30 μm or more and 100 μm or less. 3. The coil component according to claim 1, wherein the ridge portion of the plate-like core has a curved surface shape.