JP7160523B2 - Coil parts and electronic devices - Google Patents

Description

The present invention relates to coil components and electronic devices.

A coil component is known that includes a frame core made of manganese-zinc ferrite, a winding core made of manganese-zinc ferrite and provided in the frame core, and a winding wound around the winding core (for example, see Patent Reference 1).

JP-A-2007-95948

In general, in order to improve the DC superimposition characteristics of coil components and obtain a desired inductance, it is necessary to increase the overall size of the coil components. For this reason, as the size of the coil component increases, the weight of the coil component as a whole increases. For example, when the coil component is mounted on a circuit board, the durability against external vibration and impact decreases.

The present invention has been made in view of the above problems, and an object of the present invention is to improve durability against vibration and impact.

The present invention comprises an exterior portion made of a soft magnetic material and having a substantially rectangular parallelepiped shape, a coil conductor incorporated in the exterior portion, and both end portions of the coil conductor, each of which is located on a first surface of the exterior portion. a pair of terminal electrodes drawn out from the surface, the first surface of the surface of the exterior part, a second surface perpendicular to the first surface, and a third surface parallel to the second surface. a pedestal portion that exposes the pair of terminal electrodes that are adhered and drawn out from the first surface, wherein the second surface and the third surface of the exterior portion are connected to the exterior portion. The pedestal has a larger area than the surfaces other than the second surface and the third surface among the surfaces, and the pedestal portion has a region of 1/3 or more of the second surface and the third surface of the exterior portion. It is a coil component adhered to the second surface and the third surface. In addition, the present invention provides an exterior portion made of a soft magnetic material and having a substantially rectangular parallelepiped shape, a coil conductor incorporated in the exterior portion, and both end portions of the coil conductor, which are located on the surfaces of the exterior portion. a pair of terminal electrodes drawn out from a first surface, the first surface of the surface of the exterior part, a second surface perpendicular to the first surface, and a third surface parallel to the second surface and a pedestal portion that exposes the pair of terminal electrodes drawn out from the first surface, one of the four sides forming the first surface of the exterior portion. When a direction in which two sides extend is a first direction, a direction in which a side intersecting the one side extends is a second direction, and a direction intersecting the first direction and the second direction is a third direction, the pedestal portion of the portion facing the second surface and the third surface of the exterior part in the third direction is the length of the second surface and the third surface of the exterior part in the third direction It is a coil component that is 1/2 or more of the height.

In the above configuration, the pair of terminal electrodes are bent and pulled out so as to be substantially parallel to the first surface of the exterior portion, and the pedestal portion is the first surface of the exterior portion of the pair of terminal electrodes. A notch or hole larger than a portion substantially parallel to one surface is provided at the bottom, and the pair of terminal electrodes are led out to the outside through the notch or hole of the base. be able to.

In the above configuration, the pedestal may have one or more metal layers to which solder adheres when the coil component is mounted.

In the above configuration, the one or more metal layers may include a tin layer or a tin alloy layer.

In the above configuration, the pedestal may be configured to be made of resin except for the one or more metal layers.

In the above configuration, the total surface area of the one or more metal layers exposed from the pedestal may be 1/2 or more of the area of the first surface of the exterior.

In the above structure, the surfaces of the one or more metal layers exposed from the pedestal may be substantially flush with the electrode surfaces of the pair of terminal electrodes.

In the above configuration, the distance from the first surface of the exterior part to the electrode surfaces of the pair of terminal electrodes and the surface of the one or more metal layers exposed from the pedestal part from the first surface of the exterior part The difference from the distance to the point may be 15 μm or less.

In the above structure, the pair of terminal electrodes may be drawn out toward different sides of the first surface of the exterior part so as to be substantially parallel to the first surface.

In the above configuration, the pair of terminal electrodes are drawn out toward opposite side sides of the first surface of the exterior part so as to be substantially parallel to the first surface, and the pair of terminal electrodes are The total length of the one or more metal layers in the direction extending substantially parallel to the first surface is twice or more the length of the pair of terminal electrodes in the extending direction. can be done.

In the above configuration, the pair of terminal electrodes may be configured to protrude and be drawn out from the base portion in a direction substantially perpendicular to the first surface of the exterior portion.

In the above configuration, the coil conductor may have a core axis in a direction substantially parallel to the first surface of the exterior portion.

In the above configuration, an adhesive is provided between the pedestal and the first surface of the exterior, and the adhesive covers a region of 1/2 or more of the first surface of the exterior. can be configured to cover the

In the above configuration, the direction in which one of the four sides forming the first surface of the exterior portion extends is the first direction, the direction in which the side intersecting with the one side extends is the second direction, and the first When the direction intersecting the direction and the second direction is defined as a third direction, the length L in the first direction, the length W in the second direction, and the length H in the third direction of the exterior portion The relationship can be configured such that H>L≧W.

The present invention is an electronic device comprising any one of the coil components described above and a circuit board to which the pair of terminal electrodes of the coil component are joined.

According to the present invention, durability against vibration and impact can be improved.

1A and 1B are perspective views of a coil component according to Example 1. FIG. FIG. 2 is a side view of the coil component according to Example 1. FIG. FIGS. 3(a) and 3(b) are perspective views of a core forming an exterior. 4(a) and 4(b) are perspective views of the coil conductor. 5(a) and 5(b) are perspective views of the pedestal. FIG. 6 is a perspective view showing another example of the pedestal. FIG. 7 is a perspective view of a coil component according to Example 2. FIG. 8A and 8B are perspective views of a coil component according to Example 3. FIG. FIG. 9 is a side view of a coil component according to Example 3. FIG. FIG. 10 is a perspective view of a coil component according to Example 4. FIG. FIG. 11 is a cross-sectional view of an electronic device according to a fifth embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1A and 1B are perspective views of a coil component according to Example 1. FIG. FIG. 2 is a side view of the coil component according to Example 1. FIG. FIG. 1(a) is a perspective view of the coil component 100 viewed from the side opposite to the mounting surface, and FIG. 1(b) is a perspective view of the coil component 100 viewed from the mounting surface side. In FIG. 2 , the coil conductor 40 and the like built in the exterior part 10 are illustrated as seen through the exterior part 10 . The vertical direction is defined on the assumption that the circuit board is positioned vertically downward with respect to the coil component 100 when the coil component 100 is mounted on the circuit board. As shown in FIGS. 1A, 1B, and 2, the coil component 100 of Example 1 is an inductor element including an exterior portion 10, a coil conductor 40, and a base portion 60. As shown in FIGS.

The exterior part 10 is formed by bonding two cores 12 with an adhesive such as a thermosetting resin. The exterior part 10 has a substantially rectangular parallelepiped shape, and includes a lower surface 14 (mounting surface), an upper surface 16 facing the lower surface 14, side surfaces 18 and 20 that intersect the lower surface 14 and the upper surface 16 and are parallel to each other, the lower surface 14, The outer surface has sides 22 and 24 that intersect top surface 16, side surface 18 and side surface 20 and are parallel to each other. Note that the substantially rectangular parallelepiped shape is not limited to a perfect rectangular parallelepiped shape. This includes the case of having a curved surface.

The first direction is the direction in which one of the four sides constituting the lower surface 14 of the exterior part 10 extends, the second direction is the direction in which the side intersecting with the one side extends, and the first direction and the second direction intersect. A direction (for example, orthogonal) is defined as a third direction. In Example 1, in the exterior part 10, the length L in the first direction is longer than or equal to the length W in the second direction, and the length H in the third direction is longer than the length L in the first direction. It's becoming That is, the relationship H>L≧W is established. For example, the length L in the first direction is about 10 mm to 25 mm, the length W in the second direction is about 10 mm to 25 mm, and the length H in the third direction is about 15 mm to 25 mm. The side surface 18 and the side surface 20 are larger in area than the other surfaces of the outer surface of the exterior part 10 .

The exterior part 10 has a cavity 26 inside and an opening 28 communicating with the cavity 26 in the lower surface 14 . The exterior part 10 has a columnar part 30 inside the cavity 26 . The columnar portion 30 extends substantially parallel to the lower surface 14 and the upper surface 16 . An insulating film made of glass or thermosetting resin having a thickness of about 10 μm to 50 μm may be provided on the outer surface of the exterior part 10 . This improves insulation and rust resistance.

FIGS. 3(a) and 3(b) are perspective views of a core forming an exterior. As shown in FIGS. 3A and 3B, the core 12 includes a cylindrical columnar portion 30, three wall portions 34 surrounding the columnar portion 30 from three directions, and the columnar portion 30 and the wall portions 34. and a connection portion 32 that connects the Thereby, the columnar portion 30 is formed within the cavity 26 surrounded by the connecting portion 32 and the wall portion 34 . The angle between the connecting portion 32 and the columnar portion 30 and the wall portion 34 is chamfered into a rounded shape. This improves durability against vibration and impact. The columnar portion 30 and the wall portion 34 have substantially the same height. The exterior portion 10 is formed by joining the columnar portions 30 of the two cores 12 together and joining the wall portions 34 together. The core 12 is made of, for example, a crystalline metallic magnetic material, an amorphous metallic magnetic material, or a magnetic material such as ferrite. That is, the exterior part 10 is made of a soft magnetic material. For example, crystalline metallic magnetic materials include Fe--Si--Cr, Fe--Si--Al, Fe--Cr--Al, and Fe. For example, amorphous metal magnetic materials include Fe--Nb--B, Fe--Nb--B--Sn, Fe--B, Fe--Si--B, Fe--Si--BC, Fe--Si--BP, Fe--Si--BCP, or those containing these nanocrystals. For example, magnetic materials such as ferrite include Ni—Zn ferrite. The core 12 is obtained by using these magnetic materials and hardening the magnetic materials with resin or sintering them by heat treatment. The two cores 12 may be made of the same magnetic material, different magnetic materials, or formed by different forming methods. Moreover, the surface of the core 12 may be coated with resin, glass, or the like. As a result, changes in the surface state and dimensions due to environmental changes are suppressed, and the influence on adhesion between the core 12 and the pedestal portion 60 is also suppressed. Further, by using a material having a high Fe ratio as the magnetic material used for the core 12, high current characteristics can be obtained. On the other hand, since a material with a high Fe ratio also has a high specific gravity, it is selected in consideration of these factors. For example, by using a magnetic material of Fe or an alloy containing Fe, it is possible to obtain a coil component with high performance and to reduce the size of the coil component.

The coil conductor 40 will be described using FIGS. 4(a) and 4(b) in addition to FIGS. 1(a), 1(b), and 2. FIG. 4(a) and 4(b) are perspective views of the coil conductor. 4A is a perspective view of the coil conductor 40 viewed from above, and FIG. 4B is a perspective view of the terminal electrode 44 and the terminal electrode 46 with solder 50 formed thereon. The coil conductor 40 includes a helical portion 42 arranged around the columnar portion 30 in the cavity 26 of the exterior portion 10, terminal electrodes 44 and 46 which are both end portions extending from the helical portion 42, have Since the helical portion 42 is spirally wound in a direction substantially parallel to the lower surface 14 and the upper surface 16 of the exterior portion 10 , the core axis of the coil conductor 40 is aligned with the lower surface 14 and the upper surface 16 of the exterior portion 10 . The directions are substantially parallel to each other.

The terminal electrodes 44 and 46 are drawn out from the lower surface 14 of the exterior part 10 . The terminal electrodes 44 and 46 are pulled out parallel to the lower surface 14 toward opposite sides of the lower surface 14 of the exterior part 10 and extend in the second direction. The terminal electrodes 44 and the terminal electrodes 46 are drawn out in parallel with the lower surface 14 toward different sides of the lower surface 14 of the exterior part 10 instead of opposite sides, and are drawn out in the second direction instead of the second direction. It may extend in one direction.

The coil conductor 40 is, for example, a rectangular wire coil with a width of about 2.0 mm to 3.2 mm, but may be a round wire coil. The coil conductor 40 is made of a conductive wire (eg, copper (Cu) wire) with an insulating coating (eg, polyamide-imide). The insulating coating is removed from the terminal electrodes 44 and 46 . As an example, the terminal electrodes 44 and 46 are integrated with the coil conductor 40, but as another example, they may be separate from the coil conductor 40 and electrically joined together. Solder 50 used when mounting the coil component 100 on a circuit board is formed on the electrode surfaces (lower surfaces) 48 of the terminal electrodes 44 and 46 . The solder 50 is, for example, solder having a composition of Sn-3Ag-0.75Cu. The surface on which the solder 50 is formed becomes the electrode surface 48 . The electrode surface 48 may be formed at least on the lower surface, which is the surface on which the terminal electrodes 44 and 46 are mounted. and is formed on the upper surface. As a result, the coil component 100 can be firmly mounted on the circuit board.

As shown in FIG. 2 , an adhesive 90 is provided between the spiral portion 42 of the coil conductor 40 and the exterior portion 10 , and the spiral portion 42 is adhered to the exterior portion 10 with the adhesive 90 . The adhesive 90 is, for example, a thermosetting resin, such as an epoxy resin using an imidazole curing agent. By using a thermosetting resin for the adhesive 90, heat resistance and adhesive strength can be improved.

Next, the pedestal portion 60 will be described using FIGS. 5(a) and 5(b) in addition to FIGS. 1(a), 1(b), and 2. FIG. 5(a) and 5(b) are perspective views of the pedestal. FIG. 5(a) is a perspective view of the pedestal portion 60 seen from the side to which the exterior portion 10 is adhered, and FIG. 5(b) is the pedestal portion 60 seen from the side opposite to the side to which the exterior portion 10 is adhered. is a perspective view of the. Pedestal portion 60 has a bottom portion 62 with a pair of notches 66 and side portions 64 connected to opposite sides of bottom portion 62 . The base portion 60 is attached to the exterior portion 10 by arranging the bottom portion 62 of the pedestal portion 60 to face the lower surface 14 of the exterior portion 10 and arranging the side portions 64 to face the side surfaces 18 and 20. . A terminal electrode 44 and a terminal electrode 46, which are both end portions of the coil conductor 40 incorporated in the exterior portion 10, are drawn out through the notch 66 of the base portion 60. As shown in FIG.

The bottom portion 62 of the pedestal portion 60 is formed with a step so that the height on the side portion 64 side is one step higher. By embedding the adhesive 92 in this step portion, the bottom portion 62 of the pedestal portion 60 is adhered to the lower surface 14 of the exterior portion 10 and the coil conductor 40 exposed on the lower surface 14 . The adhesive 92 is, for example, a thermosetting resin, such as an epoxy resin using an imidazole curing agent. The adhesive 92 is provided covering half or more of the area of the lower surface 14 of the exterior part 10 .

The side portions 64 of the base portion 60 are adhered to the side surfaces 18 and 20 of the exterior portion 10 with an adhesive 94 . Like the adhesive 92, the adhesive 94 is, for example, a thermosetting resin, such as an epoxy resin using an imidazole curing agent. A side portion 64 of the base portion 60 is adhered to an area of ⅓ or more of the side surfaces 18 and 20 of the exterior portion 10 .

The pedestal portion 60 has one or more metal layers 68 to which solder adheres when the coil component 100 is mounted on the circuit board. The metal layer 68 is made of a metal with high solder wettability so that the solder can spread well, and is formed including, for example, a tin layer or a tin alloy layer. The metal layer 68 is, for example, tin-plated on the surface of copper or a copper alloy such as phosphor bronze. A portion of the base portion 60 other than the metal layer 68 is made of resin, for example. As the resin, for example, heat-resistant thermoplastic resin such as polyphenylene sulfide (PPS) or thermosetting resin such as epoxy resin, diallyl phthalate resin, and phenol resin can be used.

The surfaces of the one or more metal layers 68 exposed from the lower surface of the bottom portion 62 are flush with the electrode surfaces 48 of the terminal electrodes 44 and 46 . In addition, the total length of the one or more metal layers 68 in the second direction is twice or more the length of each of the terminal electrodes 44 and 46 in the second direction. The metal layer 68 is preferably provided so as to be symmetrical with respect to the center of the bottom portion 62, and the area of the surface exposed from the lower surface of the bottom portion 62 of the metal layer 68 provided at the symmetrical position is are preferably equal to each other.

According to the first embodiment, as shown in FIGS. 1A and 1B, the terminal electrode 44 and the terminal electrode 46 of the surface of the exterior part 10 are pulled out to the outside, and the lower surface 14 is perpendicular to the lower surface 14. A pedestal portion 60 is adhered to the side 18 parallel to the side 18 and the side 20 parallel to the side 18 . As a result, the mechanical stress applied to the terminal electrodes 44 and 46 due to, for example, impact when the coil component 100 is mounted on the circuit board and vibration after mounting is dispersed to the pedestal portion 60 . That is, the mechanical stress applied to the terminal electrodes 44 and 46 is reduced. Therefore, it is possible to improve durability against vibrations and shocks applied to the coil component 100 .

Moreover, according to Example 1, the base portion 60 has a notch 66 as shown in FIGS. 5(a) and 5(b). As shown in FIGS. 1A and 1B, the terminal electrodes 44 and 46 are drawn out through the notch 66 of the base portion 60 . As a result, the load applied to the coil component 100 is absorbed by the pedestal portion 60, and the load on the terminal electrodes 44 and 46 can be suppressed. In other words, the terminal electrodes 44 and 46 should not be in direct contact with the base portion 60 . As a result, the load directly applied to the terminal electrodes 44 and 46 from the pedestal portion 60 can be suppressed to a low level, and the required electrical connection between the terminal electrodes 44 and 46 and the circuit board can be ensured. FIG. 6 is a perspective view showing another example of the pedestal. As shown in FIG. 6, the base portion 60a may have a hole 70 penetrating through the bottom portion 62 instead of the notch. The terminal electrodes 44 and 46 are drawn out through the holes 70 of the base portion 60a. Even in this case, durability against vibration and impact can be improved.

Further, according to the first embodiment, as shown in FIG. 5B, the base portion 60 has one or more metal layers 68 to which solder adheres when the coil component 100 is mounted on the circuit board. As a result, the mechanical stress applied to the terminal electrodes 44 and 46 due to the impact when the coil component 100 is mounted on the circuit board and the vibration after mounting is easily distributed to the pedestal portion 60 . Therefore, durability against vibration and impact can be further improved. In order to fix the terminal electrodes 44 and 46 and the metal layer 68 to the circuit board with solder so that the mechanical stress is easily distributed to the pedestal portion 60, the surface of the metal layer 68 exposed from the pedestal portion 60 is the terminal electrode. 44 and the electrode surface 48 of the terminal electrode 46 are preferably formed in substantially the same plane. It should be noted that the term “substantially the same surface” is not limited to the case of forming a completely same surface, but a difference in level due to a manufacturing error, or a difference in level such that the terminal electrodes 44 and 46 and the metal layer 68 can both be fixed to the circuit board by soldering. This includes the case of having For example, as shown in FIG. 2, the difference between the distance X1 from the lower surface 14 of the exterior part 10 to the electrode surfaces 48 of the terminal electrodes 44 and 46 and the distance X2 from the lower surface 14 of the exterior part 10 to the surface of the metal layer 68 is 15 μm or less, both the terminal electrodes 44 and 46 and the metal layer 68 can be fixed to the circuit board by soldering. From the viewpoint of solder fixation, the difference between the distance X1 and the distance X2 is preferably 10 μm or less, more preferably 5 μm or less.

Further, according to the first embodiment, as shown in FIGS. 1A and 1B, the terminal electrodes 44 and the terminal electrodes 46 are arranged substantially on the lower surface 14 toward different sides of the lower surface 14 of the exterior part 10 . They are pulled out in parallel. As a result, the terminal electrodes 44 and 46 bear the load from either direction in which the terminal electrodes 44 and 46 are pulled out, and as a result, the mounting state on the circuit board can be ensured. Also, in FIG. 1A, the lead-out directions of the terminal electrodes 44 and 46 are the directions outward of each other in the second direction. That is, by increasing the distance between the tips of the terminal electrodes 44 and 46, the applied load can be more dispersed, and the effect of durability against vibrations and impacts can be enhanced. Note that "substantially parallel" includes not only the case of being completely parallel, but also the case of having an inclination of the degree of manufacturing error or an inclination of such an extent that it does not pose a problem when mounted on a circuit board.

Further, according to the first embodiment, as shown in FIGS. 1A and 1B, the terminal electrodes 44 and the terminal electrodes 46 are arranged on the lower surface 14 of the exterior part 10 toward opposite sides of the lower surface 14 . They are pulled out substantially parallel to each other. The sum of the lengths of the one or more metal layers 68 in the second direction in which the terminal electrodes 44 and 46 extend substantially parallel to the lower surface 14 of the exterior part 10 is It is more than double the length of 46. As a result, the area of the portion of the pedestal 60 that is fixed to the circuit board with solder increases, so that the mechanical stress can be effectively dispersed in the pedestal 60 . From the viewpoint of effectively dispersing the mechanical stress in the pedestal portion 60, the sum of the lengths of the one or more metal layers 68 in the second direction is the length of the terminal electrode 44 and the terminal electrode 46 in the second direction. The case of 2.5 times or more is preferable, and the case of 3 times or more is more preferable.

Further, according to Example 1, the base portion 60 is made of resin except for the metal layer 68 . Since the portion of the base portion 60 other than the metal layer 68 is made of resin, the adhesion of the base portion 60 to the exterior portion 10 can be improved. In addition, the manufacturing of the pedestal portion 60 is facilitated. The resin forming the base portion 60 may contain a filler. By including the filler, the mechanical strength of the pedestal portion 60 can be increased, and the coefficient of linear expansion of the pedestal portion 60 can be lowered. It should be noted that the pedestal portion 60 may also be made of metal in portions other than the metal layer 68 . By forming the pedestal 60 from metal, the mechanical strength of the pedestal 60 can be increased, and furthermore, it is possible to obtain the magnetic shielding effect of the metal. In this case, the portions of the base portion 60 other than the metal layer 68 are preferably made of a material with lower solder wettability than the metal layer 68 in order to suppress solder wetting and spreading.

Further, according to the first embodiment, the adhesive 92 provided between the pedestal portion 60 and the lower surface 14 of the exterior portion 10 covers half or more of the area of the lower surface 14 of the exterior portion 10 . It is Thereby, the pedestal portion 60 can be firmly adhered to the exterior portion 10 and the coil conductor 40 . From the point of adhesion of the pedestal 60, the adhesive 92 preferably covers two-thirds or more of the area of the lower surface 14 of the exterior part 10, and more preferably covers three-fourths or more of the area. .

Further, according to the first embodiment, the side surface 18 and the side surface 20 of the exterior part 10 are surfaces having a larger area than the other surfaces of the surface of the exterior part 10 . The pedestal portion 60 is adhered to areas of ⅓ or more of the side surfaces 18 and 20 of the exterior portion 10 . Thereby, the pedestal portion 60 can be firmly adhered to the exterior portion 10 . From the point of adhesion of the pedestal part 60, the pedestal part 60 is preferably adhered to 1/2 or more area of the side surface 18 and side surface 20 of the exterior part 10, and is adhered to 2/3 or more area. is more preferred.

Moreover, according to the first embodiment, as shown in FIGS. H has a relationship of H>L≧W. That is, the lower surface 14 of the exterior part 10 is a surface with a small area. Therefore, the area occupied by the circuit board can be reduced when the coil component 100 is mounted on the circuit board. Note that the length L in the first direction, the length W in the second direction, and the length H in the third direction of the exterior portion 10 may have a relationship of H>L>W.

Further, according to Example 1, the coil conductor 40 has a core axis in a direction substantially parallel to the lower surface 14 and the upper surface 16 of the exterior part 10, as shown in FIG. As a result, when the coil component 100 is mounted on the circuit board, there is no need to worry about the interference of the magnetic flux with the land electrodes on the circuit board side. can be increased, and mounting strength can be improved.

FIG. 7 is a perspective view of a coil component according to Example 2. FIG. As shown in FIG. 7 , in the coil component 200 of Example 2, the total surface area of the one or more metal layers 68 provided on the pedestal 60 exposed from the lower surface of the pedestal 60 is equal to the area of the lower surface 14 of the exterior 10 . 1/2 or more. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

As in the second embodiment, the total surface area of one or more metal layers 68 exposed from the pedestal portion 60 is 1/2 or more of the area of the lower surface 14 of the exterior portion 10, so that the pedestal is fixed to the circuit board by soldering. Since the area of the portion 60 is increased, the mechanical stress can be effectively distributed to the base portion 60 . From the viewpoint of effectively dispersing the mechanical stress on the pedestal 60, the total surface area of the one or more metal layers 68 exposed from the pedestal 60 is preferably 2/3 or more of the area of the lower surface 14 of the exterior 10. , 3/4 or more.

8A and 8B are perspective views of a coil component according to Example 3. FIG. As shown in FIGS. 8A and 8B, in the coil component 300 of the third embodiment, the length is 1/2 or more of the length of the side surfaces 18 and 20 of the exterior part 10 in the third direction. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

As in the third embodiment, the length in the third direction of the portion of the pedestal portion 60 facing the side surfaces 18 and 20 of the exterior portion 10 is half the length of the side surfaces 18 and 20 in the third direction. As described above, the pedestal portion 60 can be firmly adhered to the exterior portion 10 . Furthermore, it is possible to reduce the rotational moment, which is the force received from the portion of coil component 300 that is not supported by pedestal portion 60 on the upper surface side. The length in the third direction of the portion of the base portion 60 that faces the side surfaces 18 and 20 of the exterior portion 10 is preferably two-thirds or more of the length of the side surfaces 18 and 20 in the third direction. /4 or more is more preferable.

FIG. 9 is a side view of a coil component according to Example 3. FIG. As in FIG. 2, FIG. 9 illustrates the coil conductor 40 and the like built in the exterior part 10 with the exterior part 10 seen through. As shown in FIG. 9 , the distance m1 from the bottom surface of the bottom portion 62 of the pedestal portion 60 to the top surface of the side portion 64 is longer than the distance m2 from the bottom surface of the bottom portion 62 to the center of gravity of the coil component 300 . As a result, the portion 95 of the exterior portion 10 in contact with the upper surface of the side portion 64 of the pedestal portion 60 can receive a smaller rotational moment from the portion of the coil component 300 located on the upper surface side of the portion 95 . In addition, when the center of gravity is high, such as H>L>W or H>L≧W, the rotational moment becomes even greater, so that a greater effect can be obtained with respect to such a load.

FIG. 10 is a perspective view of a coil component according to Example 4. FIG. As shown in FIG. 10 , in the coil component 400 of the fourth embodiment, the terminal electrodes 44 and the terminal electrodes 46 are drawn out from the lower surface 14 of the exterior part 10 in a direction substantially perpendicular to the lower surface 14 so as to protrude from the base part 60 . ing. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

The terminal electrodes 44 and the terminal electrodes 46 may be pulled out toward different sides of the lower surface 14 of the exterior part 10 so as to be substantially parallel to the lower surface 14 as in the first embodiment, or as in the fourth embodiment. Alternatively, it may be drawn out so as to protrude from the pedestal portion 60 in a direction substantially perpendicular to the lower surface 14 of the exterior portion 10 . Note that the term “substantially vertical” includes not only the case of being completely vertical, but also the case of having an inclination to the extent of a manufacturing error or having an inclination that does not pose a problem when mounted on a circuit board.

FIG. 11 is a cross-sectional view of an electronic device according to a fifth embodiment. As shown in FIG. 11, in an electronic device 500 of the fifth embodiment, the terminal electrodes 44 and 46 of the coil component 100 of the first embodiment are joined by solder 98 to land electrodes 97 provided on the upper surface of a circuit board 96. ing. The metal layer 68 of the pedestal 60 is joined to the metal layer 99 of the circuit board 96 with solder 98 . Thereby, the coil component 100 is mounted on the circuit board 96 .

According to the fifth embodiment, the terminal electrodes 44 and 46 of the coil component 100 are joined to the land electrodes 97 of the circuit board 96 . Therefore, mechanical stress may be applied to the terminal electrode 44 and the terminal electrode 46. However, as described in the first embodiment, the mechanical stress is dispersed in the pedestal portion 60, so that the terminal electrode 44 and the terminal electrode 46 can be Mechanical stress applied to the terminal electrode 46 is reduced. Therefore, durability against vibration and impact can be improved.

In the fifth embodiment, the coil component 100 of the first embodiment is mounted on the circuit board 96, but the coil components of the second to fourth embodiments may be mounted.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations can be made within the scope of the gist of the present invention described in the scope of claims. Change is possible.

10 exterior part 12 core 14 lower surface 16 upper surface 18 to 24 side surface 26 cavity 28 opening 30 columnar part 32 connecting part 34 wall part 40 coil conductor 42 spiral part 44, 46 terminal electrode 48 electrode surface 50 solder 60, 60a pedestal part 62 Bottom 64 Side 66 Notch 68 Metal layer 70 Hole 90-94 Adhesive 95 Site 96 Circuit board 97 Land electrode 98 Solder 99 Metal layer 100-400 Coil component 500 Electronic device

Claims (16)

an exterior part made of a soft magnetic material and having a substantially rectangular parallelepiped shape;
a coil conductor embedded in the exterior;
a pair of terminal electrodes that are at both end portions of the coil conductor and are drawn out from a first surface of the surfaces of the exterior portion;
It is adhered to the first surface, the second surface perpendicular to the first surface, and the third surface parallel to the second surface among the surfaces of the exterior part , and is pulled out from the first surface. and a pedestal for exposing the pair of terminal electrodes ,
the second surface and the third surface of the exterior part have a larger area than surfaces of surfaces of the exterior part other than the second surface and the third surface;
The coil component, wherein the pedestal portion is adhered to the second surface and the third surface of the exterior portion in a region of 1/3 or more of the second surface and the third surface. an exterior part made of a soft magnetic material and having a substantially rectangular parallelepiped shape;
a coil conductor embedded in the exterior;
a pair of terminal electrodes that are at both end portions of the coil conductor and are drawn out from a first surface of the surfaces of the exterior portion;
It is adhered to the first surface, the second surface perpendicular to the first surface, and the third surface parallel to the second surface among the surfaces of the exterior part , and is pulled out from the first surface. and a pedestal for exposing the pair of terminal electrodes ,
A direction in which one of four sides forming the first surface of the exterior portion extends is a first direction, a direction in which a side intersecting with the one side extends is a second direction, the first direction and the second direction When the direction intersecting the two directions is the third direction,
The length in the third direction of the portion of the pedestal facing the second surface and the third surface of the exterior portion is equal to the length of the third surface of the second surface and the third surface of the exterior portion. A coil component that is 1/2 or more of the length in the direction. the pair of terminal electrodes are bent and pulled out so as to be substantially parallel to the first surface of the exterior part;
the pedestal has a notch or hole at the bottom that is larger than a portion substantially parallel to the first surface of the exterior of the pair of terminal electrodes;
3. The coil component according to claim 1, wherein said pair of terminal electrodes are led out through said notch or said hole of said base portion. 4. The coil component according to claim 1, wherein said pedestal portion has one or more metal layers to which solder adheres when said coil component is mounted. 5. The coil component according to claim 4, wherein said one or more metal layers include a tin layer or a tin alloy layer. 6. The coil component according to claim 4, wherein said base portion is made of resin except for said one or more metal layers. 7. The coil component according to any one of claims 4 to 6, wherein a total surface area of said one or more metal layers exposed from said pedestal is 1/2 or more of an area of said first surface of said exterior. . 8. The coil component according to any one of claims 4 to 7, wherein surfaces of said one or more metal layers exposed from said pedestal form substantially the same surface as electrode surfaces of said pair of terminal electrodes. a distance from the first surface of the exterior part to the electrode surfaces of the pair of terminal electrodes and a distance from the first surface of the exterior part to a surface of the one or more metal layers exposed from the pedestal; 9. The coil component according to claim 4, wherein the difference between is 15 μm or less. 10. The pair of terminal electrodes according to any one of claims 1 to 9, wherein the pair of terminal electrodes are drawn out toward different side sides of the first surface of the exterior part so as to be substantially parallel to the first surface. coil parts. the pair of terminal electrodes are drawn out toward opposing sides of the first surface of the exterior part so as to be substantially parallel to the first surface,
The total length of the one or more metal layers in the direction in which the pair of terminal electrodes extends substantially parallel to the first surface is twice the length of the pair of terminal electrodes in the extending direction. The coil component according to any one of claims 4 to 9, which is the above. 3. The coil component according to claim 1, wherein said pair of terminal electrodes protrude from said pedestal portion in a direction substantially perpendicular to said first surface of said exterior portion. 13. The coil component according to any one of claims 1 to 12, wherein said coil conductor has a core axis in a direction substantially parallel to said first surface of said exterior part. an adhesive provided between the base portion and the first surface of the exterior portion;
14. The coil component according to any one of claims 1 to 13, wherein said adhesive is provided covering half or more of said first surface of said exterior part. A direction in which one of four sides forming the first surface of the exterior portion extends is a first direction, a direction in which a side intersecting with the one side extends is a second direction, the first direction and the second direction When the direction intersecting the two directions is the third direction,
15. The exterior portion according to any one of claims 1 to 14, wherein a relationship between a length L in the first direction, a length W in the second direction, and a length H in the third direction satisfies H>L≧W. or the coil component according to one item. A coil component according to any one of claims 1 to 15;
and a circuit board to which the pair of terminal electrodes of the coil component are joined.

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