WO2023042512A1 - Electronic component - Google Patents

Abstract

This electronic component comprises: a bottom plate; a passive element disposed on the bottom plate; an external electrode attached to the bottom plate and electrically connected to the passive element; and a resin member disposed on the bottom plate, the resin member being in contact with the bottom plate and the passive element. The bottom plate has a bottom part having a first principal surface and a second principal surface opposite to each other, and side wall parts provided on the first principal surface of the bottom part along the outer periphery of the bottom part. The passive element has a conductive section that can be in electrical communication with the outside. The passive element is disposed in a recess, which is formed by being surrounded by the bottom part and the side wall parts, so that the conductive section is located on the first principal surface side. The resin member is fixed inside the recess and secures the passive element to the bottom plate while covering at least a portion of the conductive section.

Description

electronic components

This disclosure relates to electronic components.

Conventionally, as an electronic component, there is one described in International Publication No. 2017/169737 (Patent Document 1). This electronic component includes a bottom plate portion, a core disposed on the bottom plate portion, a coil wound around the core, and an external electrode attached to the bottom plate portion and electrically connected to the coil. The coil is formed by connecting a plurality of wire members by welding. A plurality of wire members are welded to the core on the side opposite to the bottom plate portion.

WO2017/169737

By the way, in the conventional electronic component, there are cases where the portion of the wire member in the vicinity of the welding is not covered with an insulating film, and in this case, there is a possibility that problems such as an electrical short with the outside may occur. . Therefore, it is desirable to cover the portion of the wire member that is not covered with the insulating film with the resin member.

Also, when arranging the core and the coil on the bottom plate, it is desirable to fix the core and the coil to the bottom plate. In this case, it is conceivable to use a resin member to fix the core and the coil to the bottom plate portion.

In this way, in a conventional electronic component, a resin member that covers the portion of the wire member that is not covered with the insulating coating on the side opposite to the bottom plate portion with respect to the core, and a resin member that fixes the core and the coil to the bottom plate portion and need to be provided separately, and there is a problem that the number of resin members increases. In addition, in terms of manufacturing, it is necessary to cover the portion of the wire member that is not covered with the insulating film with a resin member, and to fix the core and the coil to the bottom plate portion with the resin member, which may increase the number of manufacturing steps. be.

Therefore, the present disclosure is to provide an electronic component that can reduce the number of resin members and the number of manufacturing steps.

In order to solve the above problems, an electronic component according to one aspect of the present disclosure includes:
a bottom plate;
a passive element disposed on the bottom plate;
an external electrode attached to the bottom plate and electrically connected to the passive element;
a resin member disposed on the bottom plate portion and in contact with the bottom plate portion and the passive element;
The bottom plate portion has a bottom portion including a first main surface and a second main surface facing each other, and a side wall portion provided along the outer periphery of the bottom portion on the first main surface of the bottom portion,
The passive element has a conductive portion that can be electrically connected to the outside,
the passive element is arranged in a concave portion surrounded by the bottom portion and the side wall portion such that the conductive portion is positioned on the first main surface side;
The resin member is fixed in the concave portion to fix the passive element to the bottom plate portion and to cover at least part of the conductive portion.

Here, the "conducting portion" is a portion that is not electrically insulated and protected from the outside, for example, a portion that is not covered with an insulating film. In more detail, the term "conductable with the outside" refers to a conductor portion that is not covered with a passive element component such as an insulating film, and is exposed from the insulating coating but is not a passive element component such as a resin member. The conductor portion covered with is also conductive to the outside and is considered as a conductive portion. "The conducting portion is located on the first main surface side" means that the conducting portion is arranged so that it exists more on the first main surface side than the central position of the passive element in the direction orthogonal to the first main surface. It means that there is

According to the aspect, since the resin member is fixed in the concave portion of the bottom plate portion, the resin member is stably fixed to the bottom plate portion, thereby stably fixing the passive element to the bottom plate portion. can be fixed. Further, in the manufacturing process of the electronic component, when the liquid resin member is filled into the concave portion, the liquid resin member can be retained in the concave portion, and the passive element can be reliably fixed to the bottom plate portion by the resin member. .

In addition, since the resin member covers at least part of the conductive portion, it is possible to prevent problems such as electrical shorts with the outside.

Therefore, the resin member can serve both to fix the passive element to the bottom plate portion and to insulate the conductive portion of the passive element.

Preferably, in one embodiment of the electronic component,
the bottom has an opening penetrating the first main surface and the second main surface;
the passive element and the external electrode are electrically connected via the opening;
The resin member further exists within the opening.

According to the above embodiment, since the resin member is further present in the opening, the strength of the bottom plate can be ensured even if the opening is provided in the bottom.

Preferably, one embodiment of the electronic component further comprises a box portion attached to the bottom plate portion so as to cover the passive element.

According to the above embodiment, passive elements can be protected from the outside.

Preferably, in one embodiment of the electronic component,
The passive element is
an annular core;
and a coil wound around the core,
the core is arranged on the bottom plate portion such that the central axis of the core is orthogonal to the first main surface of the bottom portion;
The coil has a conductor portion and a coating covering a portion of the conductor portion,
The conductive portion includes the conductor portion exposed from the coating.

According to the above embodiment, it can be applied even when the passive element is an inductive element including a core and a coil.

Preferably, in one embodiment of the electronic component,
Further comprising a core cover that covers at least a portion of the core on the bottom plate portion side,
In the height direction orthogonal to the first main surface, the distance between the upper surface and the lower surface of the core is t0, and the distance between the upper end of the core cover and the opposing surface facing the lower surface of the core is t1. At this time, the ratio of the distance t1 of the core cover to the distance t0 of the core is 0.2 or more, and the upper end of the core cover is positioned higher than the upper end of the side wall portion.

Here, “upper” refers to a direction (upward direction) from the first main surface toward the core in the height direction orthogonal to the first main surface, and “higher” refers to the It means to be further away from the plane.

According to the above embodiment, the core cover covers at least part of the core on the side of the bottom plate, so insulation between the core and the coil can be ensured.

In addition, since the ratio of the distance t1 of the core cover to the distance t0 of the core in the height direction is 0.2 or more, the creeping distance can be ensured, and creeping discharge can be easily prevented.

In addition, since the upper end of the core cover is positioned higher than the upper end of the side wall portion, when the liquid resin member is filled in the concave portion of the bottom plate portion in the manufacturing process, the liquid resin member may push the upper end of the core cover. It is possible to reduce sticking to the core beyond. As a result, it is possible to reduce the contact of the resin member with the core, so that the core stress received from the resin member can be reduced, and the deterioration of the core's magnetic properties can be suppressed.

Preferably, in one embodiment of the electronic component, the lower surface of the core cover is positioned lower than the upper end of the side wall portion in the height direction.

According to the above-described embodiment, the lower surface of the core cover is positioned lower than the upper end of the side wall portion. The liquid level tends to be higher than the lower surface of the core cover. This makes it easier for the resin member to come into contact with the lower surface of the core cover, so that the core cover can be more reliably fixed to the bottom plate portion.

Preferably, in one embodiment of the electronic component, the lower surface of the core cover is positioned higher than the upper end of the side wall portion in the height direction.

According to the above-described embodiment, the lower surface of the core cover is positioned higher than the upper end of the side wall portion. After adhering to the lower surface of the core cover, excessive wetting of the side surfaces of the core cover can be reduced. As a result, it is possible to prevent the resin member from exceeding the core cover and coming into contact with the core, thereby reducing the stress on the core received from the resin member and suppressing deterioration of the core's magnetic properties.

Preferably, in one embodiment of the electronic component, the resin member extends to the upper end of the core cover on the outer surface of the core cover.

According to the above embodiment, the core cover can be more reliably fixed to the bottom plate portion.

Preferably, in one embodiment of the electronic component,
The coil is spirally wound around the core along the circumferential direction viewed from the central axis direction of the core,
The resin member extends between adjacent turns of the coil.

According to the above embodiment, each turn of the coil is fixed by the resin member, and the position of each turn is stabilized. Insulation between turns of the coil can also be ensured.

Preferably, in one embodiment of the electronic component, an upper end of a portion of the resin member extending between adjacent turns of the coil is higher than the upper end of the core cover in the height direction. in position.

According to the above embodiment, the resin member can be extended above the upper end of the core cover, and the core cover can be more securely fixed to the bottom plate. The resin member can be brought into contact with a wider range of the coil, the position of each turn of the coil is more stable, and the insulation between the turns of the coil can be further secured.

Preferably, in one embodiment of the electronic component, the resin member is separated from the core without contacting it.

According to the above embodiment, since the resin member does not come into contact with the core, it is possible to eliminate the stress on the core received from the resin member and suppress the deterioration of the magnetic properties of the core.

According to the electronic component that is one aspect of the present disclosure, the quantity of resin members can be reduced, and the number of manufacturing processes can be reduced.

1 is an upper perspective view showing an inductor component according to a first embodiment of the invention; FIG. FIG. 4 is a bottom perspective view of an inductor component; FIG. 4 is an upper perspective view showing the inside of the inductor component; 1 is an exploded perspective view of an inductor component; FIG. 1 is a cross-sectional view of an inductor component; FIG. 1 is a cross-sectional view of an inductor component; FIG. FIG. 7 is an enlarged view of a portion of FIG. 6; FIG. 5 is an enlarged cross-sectional view of the second embodiment of the inductor component of the present invention; FIG. 8 is an enlarged cross-sectional view of the inductor component according to the third embodiment of the present invention; FIG. 11 is an enlarged side view of the fourth embodiment of the inductor component of the present invention; FIG. 11 is an enlarged cross-sectional view of the fifth embodiment of the inductor component of the present invention;

In the following, an inductor component, which is one aspect of the present disclosure, will be described in detail with reference to the illustrated embodiments. Note that the drawings are partially schematic and may not reflect actual dimensions or proportions.

(First embodiment)
(Structure of inductor parts)
FIG. 1 is a top perspective view showing an inductor component according to one embodiment of the invention. FIG. 2 is a bottom perspective view of an inductor component. FIG. 3 is an upper perspective view showing the inside of the inductor component. FIG. 4 is an exploded perspective view of an inductor component.

As shown in FIGS. 1 to 4, the inductor component 1 includes a case 2, an inductor element L housed in the case 2, and first to fourth external inductors attached to the case 2 and connected to the inductor element L. It has electrodes 51 to 54 and a resin member 90 arranged inside the case 2 . The inductor component 1 is, for example, a common mode choke coil. The inductor element L is composed of an annular core 3 , a first coil 41 and a second coil 42 wound around the core 3 , and a core cover 60 attached to the core 3 . The inductor component 1 is an example of an electronic component, and the inductor element L is an example of a passive element.

The case 2 has a bottom plate portion 21 and a box portion 22 covering the bottom plate portion 21 . The case 2 is made of a material having strength and heat resistance, preferably a material having flame resistance. The case 2 is made of resin such as PPS (polyphenylene sulfide), LCP (liquid crystal polymer), PPA (polyphthalamide), or ceramics.

The bottom plate portion 21 includes a bottom portion 210 including a first main surface 210a and a second main surface 210b facing each other, and side wall portions 211 provided along the outer periphery of the bottom portion 210 on the first main surface 210a of the bottom portion 210. have. Bottom plate portion 21 has recess 215 , and recess 215 is surrounded by bottom portion 210 and side wall portion 211 . The side wall portion 211 is provided continuously in the circumferential direction, but may be provided intermittently in the circumferential direction. Bottom 210 has a plurality of openings 216 extending through first major surface 210a and second major surface 210b. A plurality of openings 216 are provided at positions corresponding to the first to fourth external electrodes 51-54. In this embodiment, there are three openings 216, but the number can be increased or decreased.

An inductor element L is arranged on the bottom plate portion 21 . That is, the core 3 is arranged on the bottom plate portion 21 such that the central axis of the core 3 is orthogonal to the first main surface 210 a of the bottom portion 210 . The central axis of the core 3 means the central axis of the inner diameter hole of the core 3 . The shape of case 2 (bottom plate portion 21 and box portion 22 ) is rectangular when viewed from the central axis direction of core 3 . In this embodiment, the shape of case 2 is rectangular.

Here, the lateral direction of the case 2 viewed from the central axis direction of the core 3 is defined as the X direction, and the longitudinal direction of the case 2 viewed from the central axis direction of the core 3 is defined as the Y direction. Let the height direction of the case 2, which is the direction perpendicular to , be the Z direction. The bottom plate portion 21 and the box portion 22 of the case 2 are arranged to face each other in the Z direction. The direction is reversed. That is, in the height direction perpendicular to the first main surface 210a, the direction from the first main surface 210a toward the core 3 is the upward direction. When the shape of the bottom plate portion 21 of the case 2 is square, the length of the case 2 in the X direction and the length of the case 2 in the Y direction are the same.

The box portion 22 is attached to the bottom plate portion 21 so as to cover the inductor element L. That is, the core 3 and the coils 41 and 42 are surrounded by the box portion 22 and are not exposed to the outside. Therefore, inductor element L can be protected from the outside.

The first to fourth external electrodes 51 to 54 are attached to the bottom plate portion 21 . The first external electrode 51 and the second external electrode 52 are positioned at two corners of the bottom plate portion 21 facing each other in the Y direction, and the third external electrode 53 and the fourth external electrode 54 are positioned opposite each other in the Y direction of the bottom plate portion 21. located at the two corners of the The first external electrode 51 and the third external electrode 53 are opposed in the X direction, and the second external electrode 52 and the fourth external electrode 54 are opposed in the X direction.

The core 3 is a toroidal core, and the shape of the core 3 is oval (track-shaped) when viewed from the central axis direction. The core 3 has a pair of longitudinal portions 31 extending along the major axis and facing in the minor axis direction, and a pair of short portions extending along the minor axis and facing in the major axis direction when viewed from the central axis direction. 32. Note that the shape of the core 3 may be rectangular, elliptical, or circular when viewed from the central axis direction.

The core 3 is composed of, for example, a ceramic core such as ferrite, or a magnetic core made of iron-based powder molding or nanocrystalline foil. The core 3 has a first end surface 301 and a second end surface 302, an inner peripheral surface 303 and an outer peripheral surface 304, which face each other in the central axis direction. The first end surface 301 is the lower end surface of the core 3 and faces the first major surface 210a of the bottom plate portion 21 . The second end surface 302 is an upper end surface of the core 3 and faces the inner surface of the box portion 22 . The core 3 is housed in the case 2 such that the longitudinal direction of the core 3 is aligned with the Y direction.

The shape of the cross section orthogonal to the circumferential direction when viewed from the central axis direction of the core 3 is rectangular. The first end surface 301 and the second end surface 302 are arranged perpendicular to the central axis direction of the core 3 . The inner peripheral surface 303 and the outer peripheral surface 304 are arranged parallel to the central axis direction of the core 3 . In this specification, the term “perpendicular” includes not only a completely vertical state but also a substantially vertical state. Moreover, "parallel" is not limited to a state of being completely parallel, but also includes a state of being substantially parallel.

The lower part of the core 3 is covered with a core cover 60. That is, a portion of the core 3 on the bottom plate portion 21 side is covered with the core cover 60 . At least a portion of the core 3 on the bottom plate portion 21 side may be covered with the core cover 60 , and the entire core 3 may be covered with the core cover 60 . The core cover 60 is made of, for example, super engineering plastics such as LCP, PPA, and PPS, thereby improving the heat resistance, insulation and workability of the core cover 60 .

The core cover 60 is formed in an annular shape and has an annular recess 61 that covers the lower portion of the core 3 . The core cover 60 can be attached to the core 3 by fitting the lower portion of the core 3 into the annular recess 61 of the core cover 60 .

The resin member 90 is arranged in the recess 215 of the bottom plate portion 21 and contacts the bottom plate portion 21 and the inductor element L. As the material of the resin member 90, for example, a thermosetting epoxy resin can be used.

The first coil 41 is wound around the core 3 and the core cover 60 between the first external electrode 51 and the second external electrode 52 . One end of the first coil 41 is connected to the first external electrode 51 . The other end of the first coil 41 is connected to the second external electrode 52 .

The second coil 42 is wound around the core 3 and the core cover 60 between the third external electrode 53 and the fourth external electrode 54 . One end of the second coil 42 is connected to the third external electrode 53 . The other end of the second coil 42 is connected to the fourth external electrode 54 .

The first coil 41 and the second coil 42 are spirally wound around the core 3 along the circumferential direction of the core 3 as seen from the central axis direction of the core 3 . Specifically, the first coil 41 is wound around one longitudinal portion 31 of the core 3 along the longitudinal direction of the core 3 , and the second coil 42 is wound around the other longitudinal portion 31 of the core 3 . 3 are wound along the long axis direction. The winding axis of the first coil 41 and the winding axis of the second coil 42 run parallel. The first coil 41 and the second coil 42 are symmetrical with respect to the long axis of the core 3 .

The number of turns of the first coil 41 and the number of turns of the second coil 42 are the same. The winding direction of the first coil 41 around the core 3 and the winding direction of the second coil 42 around the core 3 are opposite to each other. That is, the winding direction of the first coil 41 from the first external electrode 51 to the second external electrode 52 is opposite to the winding direction of the second coil 42 from the third external electrode 53 to the fourth external electrode 54. direction.

Then, a common mode current flows in the first coil 41 from the first external electrode 51 toward the second external electrode 52, flows in the second coil 42 from the third external electrode 53 toward the fourth external electrode 54, In other words, the first to fourth external electrodes 51 to 54 are connected so that the current flows in the same direction. When a common mode current flows through the first coil 41 , a first magnetic flux is generated within the core 3 by the first coil 41 . When a common mode current flows through the second coil 42 , a second magnetic flux is generated in the core 3 in a direction in which the first magnetic flux and the core 3 strengthen each other. Therefore, the first coil 41 and the core 3, and the second coil 42 and the core 3 act as an inductance component, and noise is removed from the common mode current.

The first coil 41 is formed by connecting a plurality of pin members by welding such as laser welding or spot welding. Note that FIG. 3 does not show the state in which the plurality of pin members are actually welded, but shows the state in which the plurality of pin members are assembled.

The multiple pin members are rod-shaped members, not printed wiring or conducting wires. The pin member has rigidity. Specifically, in a cross section perpendicular to the circumferential direction of the core 3 , the pin member extends around the circumference of the core passing through the first end surface 301 , the second end surface 302 , the inner peripheral surface 303 and the outer peripheral surface 304 of the core 3 . It is shorter than the length of a minute and has high rigidity, making it difficult to bend.

The plurality of pin members includes a bent pin member 410 that is bent into a substantially U shape, and linear pin members 411 and 412 that extend substantially linearly. The straight pin members 411 and 412 are also referred to as first pin members, and the bent pin member 410 is also referred to as a second pin member.

The first coil 41 includes, in order from one end to the other end, a first straight pin member 411 on one end side (one side), a plurality of sets of bent pin members 410 and second straight pin members 412, and the other end side (other side). , and a first linear pin member 411 . The lengths of the first straight pin member 411 and the second straight pin member 412 are different. Regarding the spring index of the bent pin member 410, as shown in FIG. At the curvature radius R1 of the bending pin member 410 located at the corner of the outer peripheral surface 304 of the core 3 and the curvature radius R2 of the bending pin member 410 located at the corner of the inner peripheral surface 303 of the core 3, The spring index Ks of member 410 is less than 3.6. The spring index Ks can be represented by the curvature radii R1 and R2 of the bending pin member/the wire diameter r of the bending pin member. Thus, the bending pin member 410 has high rigidity and is difficult to bend.

The bent pin members 410 and the second straight pin members 412 are alternately connected by welding such as laser welding or spot welding. One end of the second straight pin member 412 is connected to one end of the bent pin member 410 , and the other end of the second straight pin member 412 is connected to one end of the other bent pin member 410 . By repeating this, the plurality of bent pin members 410 and the second straight pin members 412 are connected, and the connected plurality of bent pin members 410 and the second straight pin members 412 are spirally attached to the core 3. placed. That is, one set of bent pin member 410 and second straight pin member 412 constitutes one turn.

The bending pin members 410 are arranged in parallel along the second end surface 302 , the inner peripheral surface 303 and the outer peripheral surface 304 of the core 3 . The second straight pin members 412 are arranged in parallel along the first end surface 301 of the core 3 . The first straight pin members 411 are arranged in parallel along the first end surface 301 of the core 3 .

The bending pin members 410 of adjacent turns are fixed by an adhesive member 70 . This makes it possible to stably attach the plurality of bending pin members 410 to the core 3 . Similarly, the adjacent first linear pin member 411 and the second linear pin member 412 are fixed by the adhesive member 70 , and the adjacent second linear pin member 412 are fixed by the adhesive member 70 . This makes it possible to stably attach the plurality of first straight pin members 411 and the second straight pin members 412 to the core 3 .

The first external electrode 51 is connected to one first linear pin member 411 , and one first linear pin member 411 is connected to one end of the bent pin member 410 of the turn adjacent to the one first linear pin member 411 . Connected. One first straight pin member 411 has a mounting piece 411c. The first external electrode 51 has a mounting portion 51 a that enters the case 2 . The attachment piece 411 c of one first straight pin member 411 is connected to the attachment portion 51 a of the first external electrode 51 . Specifically, the mounting portion 51a passes through the first opening 216 and is connected to the mounting piece 411c. In short, the first coil 41 and the first external electrode 51 are electrically connected via the first opening 216 .

The second external electrode 52 is connected to the other first straight pin member 411 , and the other first straight pin member 411 is connected to one end of the second straight pin member 412 on the turn adjacent to the other first straight pin member 411 . connected to The mounting piece 411 c of the other first straight pin member 411 is connected to the mounting portion 52 a of the second external electrode 52 . Specifically, the mounting portion 52a passes through the second opening 216 and is connected to the mounting piece 411c. In short, the first coil 41 and the second external electrode 52 are electrically connected via the second opening 216 .

The second coil 42, like the first coil 41, is composed of a plurality of pin members. That is, the second coil 42 includes, in order from one end to the other end, a first straight pin member 421 on one end side (one side), a plurality of sets of bent pin members 420 and second straight pin members 422, and the other end side ( the other) and the first linear pin member 421 . A bent pin member 420 and a second straight pin member 422 are alternately connected and wound around the core 3 . That is, the plurality of bent pin members 420 and the second straight pin members 422 are connected, and the connected plurality of bent pin members 420 and the second straight pin members 422 are spirally wound around the core 3. .

The third external electrode 53 is connected to one first straight pin member 421 , and one first straight pin member 421 is connected to one end of the bent pin member 420 of the turn adjacent to the one first straight pin member 421 . Connected. The attachment piece 421 c of one first straight pin member 421 is connected to the attachment portion 53 a of the third external electrode 53 . Specifically, the mounting portion 53a passes through the first opening 216 and is connected to the mounting piece 421c. In short, the second coil 42 and the third external electrode 53 are electrically connected via the first opening 216 .

The fourth external electrode 54 is connected to the other first straight pin member 421 , and the other first straight pin member 421 is one end of the second straight pin member 412 in the turn adjacent to the other first straight pin member 421 . connected to The mounting piece 421 c of the other first straight pin member 421 is connected to the mounting portion 54 a of the fourth external electrode 54 . Specifically, the mounting portion 54a passes through the third opening 216 and is connected to the mounting piece 421c. In short, the second coil 42 and the fourth external electrode 54 are electrically connected via the third opening 216 .

As shown in FIG. 3, the first coil 41 and the second coil 42 (pin members 410-412, 420-422) each include a conductor portion and a coating that partially covers the conductor portion. The conductor part is, for example, a copper wire, and the coating is, for example, a polyamide-imide resin. The thickness of the coating is, for example, 0.02-0.04 mm.

The first straight pin members 411, 421 are composed of conductor portions 411a, 421a without coating. The second straight pin members 412, 422 are composed of uncoated conductor portions 412a, 422a. The bent pin members 410, 420 are composed of conductor portions 410a, 420a and coatings 410b, 420b.

At one end and the other end of the bent pin members 410, 420, the conductor portions 410a, 420a are exposed from the coatings 410b, 420b. That is, the first straight pin members 411, 421, the second straight pin members 412, 422, and the bent pin members 410, 420 are welded together at the exposed conductor portions 411a, 421a, 412a, 422a, 410a, 420a. It is These conductor portions not covered with the film, that is, the conductor portions exposed from the film (without the film) are capable of conducting with the outside and correspond to the "conducting portion" described in the claims.

FIG. 6 is an XZ sectional view passing through the center of the inductor component 1 in the Y direction. In FIG. 6, the box part 22 is omitted and drawn.

As shown in FIG. 6, in the first coil 41, the ends of adjacent pin members have welded portions welded to each other. A welded portion means a portion that is once melted during welding and then solidified. Specifically, the first coil 41 has a first welded portion w11 and a second welded portion w12. More specifically, in the adjacent turns in the first coil 41, the second straight pin member 412 and the bent pin member 410 of one turn are bent with one conductor portion 412a of the second straight pin member 412. The conductor portion 410a of the pin member 410 is welded together to form a first welded portion w11, and the second straight pin member 412 and the bent pin member 410 of the other turn are connected to the other of the second straight pin member 412. The conductor portion 412a and the conductor portion 410a of the bent pin member are welded together to form a second weld portion w12.

6 shows a turn composed of the second straight pin member 412 and the bent pin member 410 of the first coil 41, but the first straight pin member 411 and the bent pin member 410 The same is true for constructed turns. Specifically, the first straight pin member 411 is welded at the conductor portion 410a of the bent pin member 410 connected to the conductor portion 411a to form the first weld w11 or the second weld w12.

The second coil 42 has a first welded portion w21 and a second welded portion w22. In the second coil 42 as well as in the first coil 41 , in adjacent turns, the second straight pin member 422 and the bent pin member 420 of one turn are connected to one conductor portion of the second straight pin member 422 . 422a and the conductor portion 420a of the bent pin member 420 to form a first welded portion w21. The other conductor portion 422a is welded to the conductor portion 420a of the bent pin member to form a second weld portion w22. Also, the first straight pin member 421 is welded at the conductor portion 420a of the bent pin member 420 connected to the conductor portion 421a to form the first welded portion w21 or the second welded portion w22. The first welded portion w21 and the second welded portion w22 of the second coil 42 have the same configuration as the first welded portion w11 and the second welded portion w12 of the first coil 41, and the description thereof will be omitted.

The core cover 60 exists between the core 3 and the conductor portions and welded portions exposed from the coating of the coils 41 and 42 . Thereby, the conductor portions and welded portions of the coils 41 and 42 and the core 3 can be insulated more reliably.

The core cover 60 is provided over the first end surface 301 of the core 3, part of the inner peripheral surface 303 of the core 3, and part of the outer peripheral surface 304 of the core 3. The core cover 60 includes a first portion 60a facing the inner peripheral surface 303 of the core 3, a second portion 60b facing the outer peripheral surface 304 of the core 3, and a third portion 60c facing the first end surface 301 of the core 3. and

The core cover 60 is indirectly connected to the core 3. That is, the core cover 60 is not directly connected to the core 3 , and more specifically, the core cover 60 is connected to the core 3 via the connecting member 80 . By connecting the connecting member 80 to a part of the core 3, the stress on the core 3 received from the core cover 60 can be reduced, and deterioration of the magnetic properties of the core 3 can be suppressed. That is, it is possible to suppress a decrease in the inductance value due to magnetostriction. Note that the core cover 60 may be simply fitted to the core 3 without being connected to the core 3 via the connecting member 80 .

The connecting member 80 is provided between the first end surface 301 of the core 3 and the third portion 60c of the core cover 60. As a result, the attachment of the core cover 60 to the core 3 can be stabilized while reducing the effect of magnetostriction on the core 3 .

Examples of materials for the connection member 80 include soft resins such as urethane resins and silicon resins. By providing such a soft resin, the influence of magnetostriction can be reduced.

6, the connection member 80 is provided over the entire area between the first end surface 301 of the core 3 and the third portion 60c of the core cover 60, but may be provided only partially. 6, the connecting member 80 is provided between the first end surface 301 of the core 3 and the third portion 60c of the core cover 60, but the inner peripheral surface 303 of the core 3 and the core cover 60 may be provided between the first portion 60a of the core 3, and may be provided between the outer peripheral surface 304 of the core 3 and the second portion 60b of the core cover 60; may be

As shown in FIG. 6, the inductor element L is arranged in the concave portion 215 so that the conductor portions of the coils 41 and 42 exposed from the coating are positioned on the first main surface 210a side. Resin member 90 is fixed in concave portion 215 to fix inductor element L to bottom plate portion 21 and to cover at least part of the conductor portions (conducting portions) exposed from the coatings of coils 41 and 42 . Preferably, the resin member 90 covers the entire conductive portion.

Because the resin member 90 is made of, for example, a thermosetting resin, it is fixed to the inductor element L and the bottom plate portion 21 by curing. The resin member 90 contacts the inner surface of the recess 215, the first portion 60a of the core cover 60, part of the second portion 60b of the core cover 60, and part of the third portion 60c of the core cover 60, The conductor portions 411a, 412a, 410a exposed from the coating 410b of the first coil 41 and the conductor portions 421a, 422a, 420a exposed from the coating 420b of the second coil 42 are covered. Furthermore, the resin member 90 also covers the welded portions w11, w12, w21 and w22 of the coils 41 and 42. As shown in FIG.

According to the above configuration, the resin member 90 is fixed in the recess 215 of the bottom plate portion 21 , so that the resin member 90 is stably fixed to the bottom plate portion 21 , so that the resin member 90 functions as an inductor element. L can be stably fixed to the bottom plate portion 21 . Further, when the liquid resin member 90 is filled in the recess 215 in the manufacturing process of the inductor component 1 , the liquid resin member 90 can be retained in the recess 215 , and the inductor element L can be held in the bottom plate portion 21 by the resin member 90 . can be fixed securely.

In addition, since the resin member 90 covers the conductor portions exposed from the coatings of the coils 41 and 42, problems such as electrical shorts with the outside can be prevented.

Therefore, the resin member 90 can serve both to fix the inductor element L to the bottom plate portion 21 and to insulate the conductor portions exposed from the films of the coils 41 and 42, thereby reducing the number of the resin members 90. Moreover, the number of manufacturing steps of the inductor component 1 can be reduced.

Further, by providing the resin member 90 on the side of the bottom plate portion 21, the members made of resin, specifically, the resin member 90, the core cover 60, and the connection member 80, all exist on the side of the bottom plate portion 21. Become. When the inductor component is used, heat may be accumulated by energizing the coils 41 and 42, but since the coil and the bottom plate portion 21 are connected by the resin member 90, the heat of the coils 41 and 42 is facilitates heat dissipation to the mounting substrate through the bottom plate portion 21 . Moreover, the resin member 90 can prevent the positional deviation of the first coil 41 and the second coil 42 . Furthermore, by arranging the resin member 90, the core cover 60, and the connection member 80 on the side of the bottom plate portion 21, the center of gravity of the inductor component 1 can be moved to the side of the bottom plate portion 21, and the installation of the inductor component 1 can be stabilized. performance can be improved.

Preferably, the resin member 90 further exists within the opening 216 shown in FIG. Specifically, the resin member 90 is embedded in the opening 216, and the mounting portions 51a to 54a are embedded in the resin member 90. As shown in FIG. According to the above configuration, since the resin member 90 exists within the opening 216 , the strength of the bottom plate portion 21 can be ensured even if the opening 216 is provided in the bottom portion 210 . In addition, foreign matter such as solder balls and flux can be prevented from entering the case 2 from the second main surface 210b of the bottom portion 210, and insulation failure between the coils 41 and 42 can be prevented.

FIG. 7 is an enlarged view of a portion of FIG. As shown in FIG. 7, in the height direction orthogonal to the first main surface 210a, the distance between the second end surface 302, which is the upper surface of the core 3, and the first end surface 301, which is the lower surface of the core 3, is t0. When the distance between the upper end 60u and the facing surface 60s of the core 3 facing the second end surface 302 is t1, the ratio of the distance t1 of the core cover 60 to the distance t0 of the core 3 is 0.2 or more.

Specifically, the upper end 60u of the core cover 60 is the upper end of the first portion 60a (see FIG. 6) and the upper end of the second portion 60b. The facing surface 60s of the core cover 60 is the upper surface of the third portion 60c. The facing surface 60s faces the second end surface 302 with the connecting member 80 interposed therebetween. In the height direction, the position of the upper end of the first portion 60a and the position of the upper end of the second portion 60b are the same. Just do it.

According to the above configuration, the core cover 60 covers at least a portion of the core 3 on the bottom plate portion 21 side, so insulation between the core 3 and the coils 41 and 42 can be ensured. Moreover, since the ratio is 0.2 or more, the creeping distance can be ensured, and creeping discharge can be easily prevented. Here, creeping discharge means that current flows from the conductor portion 420 a of the bent pin member 420 to the core 3 through the second portion 60 b of the core cover 60 . In this case, the creepage distance refers to the length of the second portion 60b of the core cover 60 (that is, the distance t1). Incidentally, the larger the ratio, that is, the higher the height of the upper end 60u of the core cover 60, the longer the creepage distance and the higher the insulation. Therefore, the ratio may be 1. Specifically, the core cover 60 may reach the second end surface 302 of the core 3 or may cover the entire outer surface of the core 3 .

For example, the diameter of the bent pin member 420 and the straight pin member 422 is 1.0 mm, the length of the conductor portion 420a exposed from the coating 420b of the bent pin member 420 is 2.0 mm, and the distance t1 is It was confirmed that creeping discharge was prevented against a withstand voltage of 2 kV when the thickness was 3 mm.

As shown in FIG. 7, the upper end 60u of the core cover 60 is located higher than the upper end 211u of the side wall portion 211 in the height direction. In other words, the upper end 60 u of the core cover 60 is farther from the first major surface 210 a than the upper end 211 u of the side wall portion 211 .

According to the above configuration, in the manufacturing process, when the liquid resin member 90 is filled into the concave portion 215 of the bottom plate portion 21, the liquid resin member 90 is prevented from adhering to the core 3 beyond the upper end 60u of the core cover 60. can be reduced. As a result, it is possible to reduce the contact of the resin member 90 with the core 3 , thereby reducing the stress on the core 3 received from the resin member 90 and suppressing deterioration of the magnetic properties of the core 3 .

As shown in FIG. 7, the lower surface 60w of the core cover 60 is positioned lower than the upper end 211u of the side wall portion 211 in the height direction. A lower surface 60w of the core cover 60 is a surface facing the first major surface 210a of the third portion 60c. The lower surface 60w faces the first main surface 210a with the resin member 90 and the linear pin member 422 interposed therebetween.

According to the above configuration, the lower surface 60w of the core cover 60 is positioned lower than the upper end 211u of the side wall portion 211, so that when filling the recess 215 of the bottom plate portion 21 with the liquid resin member 90 in the manufacturing process, , the liquid level of the liquid resin member 90 tends to be higher than the lower surface 60 w of the core cover 60 . This makes it easier for the resin member 90 to come into contact with the lower surface 60 w of the core cover 60 , so that the core cover 60 can be more securely fixed to the bottom plate portion 21 .

(Manufacturing method of inductor component)
Next, a method for manufacturing inductor component 1 will be described.

As shown in FIG. 3, the first coil 41 and the second coil 42 are wound around the core 3 in which the core cover 60 is fitted so that the winding axes run parallel to each other, and the first coil 41 is exposed. At least part of the conductor parts 411a, 412a, 410a and at least part of the exposed conductor parts 421a, 422a, 420a of the second coil 42 are arranged on the first end surface 301 side of the core 3 .

After that, with the first end surface 301 of the core 3 facing upward, each pin member of the first coil 41 is welded, and each pin member of the second coil 42 is welded.

After that, as shown in FIG. 6, the core 3 and the coils 41 and 42 are placed in the concave portion 215 of the bottom plate portion 21 so that the conductor portions of the coils 41 and 42 exposed from the coating are positioned on the first main surface 210a side. be placed within Then, the recess 215 is filled with the liquid resin member 90 by, for example, a potting method. At this time, the liquid resin member 90 stays in the concave portion 215 and wets and spreads over the conductor portions exposed from the coating of the coils 41 and 42 and a portion of the core cover 60 . Furthermore, the liquid resin member 90 is also filled in the opening 216 of the bottom plate portion 21 . In order to prevent the liquid resin member 90 from leaking from the opening 216 , a tape is attached to the second main surface 210 b of the bottom portion 210 so as to close the opening 216 .

After that, heat is applied to harden the liquid resin member 90 . Thereby, the core 3 and the coils 41 and 42 can be fixed to the bottom plate portion 21 by the resin member 90, and the conductor portions of the coils 41 and 42 exposed from the coating can be covered by the resin member 90. Moreover, the opening 216 can be filled with the resin member 90 . A thermosetting epoxy resin is used as the material of the resin member 90, and its elastic modulus is 7 GPa.

After that, the inductor component 1 is manufactured by covering it with the box portion 22 and storing it in the case 2 . By using such a manufacturing method, the number of steps for manufacturing inductor component 1 can be reduced, and inductor component 1 can be manufactured more easily.

(Second embodiment)
FIG. 8 is an enlarged cross-sectional view of the inductor component of the second embodiment. FIG. 8 shows a part of the cross section of the inductor component in the XZ direction. In the second embodiment, the positional relationship between the core cover and the side wall portion is different from that in the first embodiment. This difference will be explained below. The rest of the configuration is the same as that of the first embodiment, and the same reference numerals as those of the first embodiment are given, and the description thereof is omitted.

As shown in FIG. 8, in the inductor component 1A of the second embodiment, the lower surface 60w of the core cover 60 is positioned higher than the upper end 211u of the side wall portion 211 in the height direction. At this time, the bent pin member 420 and the straight pin member 422 are separated from the bottom portion 210 . That is, the resin member 90 exists between the bent pin member 420 and the straight pin member 422 and the bottom portion 210 . The resin member 90 may wet the side surface of the bent pin member 420 and extend upward.

According to the above configuration, the lower surface 60w of the core cover 60 is positioned higher than the upper end 211u of the side wall portion 211. Therefore, when the liquid resin member 90 is filled into the concave portion 215 of the bottom plate portion 21 in the manufacturing process, After the liquid resin member 90 adheres to the lower surface 60w of the core cover 60, excessive wetting of the side surfaces of the first portion 60a and the second portion 60b of the core cover 60 can be reduced. This can reduce the contact of the resin member 90 with the core 3 beyond the core cover 60 , thereby reducing the stress applied to the core 3 from the resin member 90 and suppressing deterioration of the magnetic properties of the core 3 .

(Third Embodiment)
FIG. 9 is an enlarged cross-sectional view of the inductor component of the third embodiment. FIG. 9 shows a part of the cross section of the inductor component in the XZ direction. The third embodiment differs from the first embodiment in the position of the resin member. This difference will be explained below. The rest of the configuration is the same as that of the first embodiment, and the same reference numerals as those of the first embodiment are given, and the description thereof is omitted.

As shown in FIG. 9, in the inductor component 1B of the third embodiment, the resin member 90 extends to the upper end 60u of the core cover 60 on the outer surface of the core cover 60. As shown in FIG. Specifically, the resin member 90 contacts the side surface of the second portion 60b and extends to the upper end of the second portion 60b.

In the manufacturing process, the liquid resin member 90 wets up to the upper end of the second portion 60b along the side surface of the second portion 60b. Also, the liquid resin member 90 gets wet along the gap between the second portion 60 b and the bent pin member 420 . That is, the liquid resin member 90 gets wet due to capillary action. At this time, the shape of the upper end 90u of the resin member 90 reaching the upper end 60u of the core cover 60 becomes concave due to the surface tension of the liquid surface.

According to the above configuration, since the resin member 90 extends to the upper end 60u of the core cover 60 on the outer surface of the core cover 60, the contact area between the resin member 90 and the outer surface of the core cover 60 increases. The core cover 60 can be securely fixed to the bottom plate portion 21 .

Preferably, the resin member 90 extends upward along the side surface of the coil 42 outside the coil 42 (bending pin member 420). That is, the resin member 90 wets the outer side surface of the coil 42 to form a fillet. According to this, the adhesion area of the resin member 90 to the coil 42 is increased, and the fixation between the coil 42 and the bottom plate portion 21 is strengthened. Also, the insulation of the coil 42 is enhanced by the two layers of the coating 420b and the resin member 90. As shown in FIG.

The resin member 90 may extend to the upper end 60u of the core cover 60 on the entire side surface of the second portion 60b of the core cover 60. Alternatively, the portion of the resin member 90 extending to the upper end 60u may be a portion of the side surface of the second portion 60b of the core cover 60, or the core 3 and the coil may be formed on the side surface of the second portion 60b of the core cover 60. It may be only the portion located in the region where 41 and 42 face each other, or it may be only the portion located in the longitudinal portion 31 of the core 3 on the side surface of the second portion 60b of the core cover 60. .

(Fourth embodiment)
FIG. 10 is an enlarged side view of the inductor component of the fourth embodiment. FIG. 10 shows part of the side surface of the inductor component viewed from the reverse X direction. The fourth embodiment differs from the first embodiment in the position of the resin member. This difference will be explained below. The rest of the configuration is the same as that of the first embodiment, and the same reference numerals as those of the first embodiment are given, and the description thereof is omitted.

As shown in FIG. 10, in the inductor component 1C of the fourth embodiment, the resin member 90 extends between adjacent turns of the first coil 41 and the second coil 42, respectively. Specifically, the resin member 90 extends between the adjacent bending pin members 420 of the second coil 42 . Note that the same applies to the first coil 41 as well.

In the manufacturing process, the liquid resin member 90 wets upward along the gaps between adjacent turns. That is, the liquid resin member 90 gets wet due to capillary action. At this time, the shape of the upper end 90u of the resin member 90 becomes concave due to the surface tension of the liquid surface.

According to the above configuration, each turn of the coils 41 and 42 is fixed by the resin member 90, and the position of each turn is stabilized. Also, the insulation between the turns of the coils 41 and 42 can be ensured.

Preferably, in the height direction, the upper end 90u of the portion of the resin member 90 extending between the adjacent turns of the first coil 41 and the second coil 42 is higher than the upper end 60u of the core cover 60. in a high position.

According to the above configuration, the resin member 90 can be extended above the upper end 60 u of the core cover 60 , and the coils 41 and 42 can be securely fixed by the bottom plate portion 21 . The resin member 90 can be brought into contact with many areas of the coils 41 and 42, the positions of the turns of the coils 41 and 42 are more stable, and the insulation between the turns of the coils 41 and 42 is better secured. can.

Preferably, the resin member 90 is separated from the core 3 without contacting it. According to the above configuration, since the resin member 90 does not come into contact with the core 3 , the stress on the core 3 received from the resin member 90 is eliminated, and deterioration of the magnetic properties of the core 3 can be suppressed.

(Fifth embodiment)
FIG. 11 is an enlarged cross-sectional view of the inductor component of the fifth embodiment. FIG. 11 shows a part of the cross section of the inductor component in the XZ direction. The fifth embodiment differs from the first embodiment in the configuration of the core cover. This difference will be explained below. The rest of the configuration is the same as that of the first embodiment, and the same reference numerals as those of the first embodiment are given, and the description thereof is omitted.

As shown in FIG. 11, the core cover 60A covers the entire outer surface of the core 3 in the inductor component 1D of the fifth embodiment. Specifically, the core cover 60 includes a first portion 60a facing the inner peripheral surface 303 of the core 3, a second portion 60b facing the outer peripheral surface 304 of the core 3, and a first end surface 301 of the core 3. It has a third portion 60 c that faces and a fourth portion 60 d that faces the second end surface 302 of the core 3 . At this time, the upper surface of the fourth portion 60 d corresponds to the upper end 60 u of the core cover 60 .

The core cover 60A is, for example, separable into an upper half and a lower half. When attaching the core cover 60A to the core 3, the upper part is fitted from the upper side of the core 3, the lower part is fitted from the lower side of the core 3, and then the upper part and the lower part are connected, thereby attaching the core cover 60A to the core 3. can be attached to

The core cover 60 is indirectly connected to the core 3. Specifically, core cover 60 is connected to core 3 via connecting member 80 . By connecting the connecting member 80 to a part of the core 3, the stress on the core 3 received from the core cover 60 can be reduced, and deterioration of the magnetic properties of the core 3 can be suppressed. That is, it is possible to suppress a decrease in the inductance value due to magnetostriction.

According to the above configuration, since the core 3 is not exposed, the insulation between the core 3 and the coils 41, 42 can be improved. Also, creeping discharge can be eliminated. Further, even if the liquid resin member 90 gets wet during the manufacturing process, it does not directly adhere to the core 3 , so the stress on the core 3 received from the resin member 90 can be reduced, and the deterioration of the magnetic properties of the core 3 can be suppressed.

Note that the present disclosure is not limited to the above-described embodiments, and design changes are possible without departing from the gist of the present disclosure. For example, each characteristic point of the first to fifth embodiments may be combined in various ways. The shape of the case and the shape of the core are not limited to those of this embodiment, and can be changed in design. Also, the number of coils is not limited to that of this embodiment, and can be changed in design. Also, the box portion of the case may be omitted, and the core cover may be omitted.

In the above embodiment, an inductor component was described as an example of an electronic component, but a capacitor component, a resistor component, or the like may also be used. Moreover, in the above-described embodiments, an inductor element was described as an example of a passive element, but a capacitor element, a resistance element, or the like may be used.

1, 1A to 1D Inductor parts (electronic parts)
2 Case 21 Bottom plate portion 210 Bottom portion 210a First main surface 210b Second main surface 211 Side wall portion 211u Upper end 215 Recess 216 Opening 22 Box portion 3 Core 301 First end surface (lower surface)
302 second end surface (upper surface)
303 inner peripheral surface 304 outer peripheral surface 41 first coil 410 bent pin member 410a conductor portion 410b coating 411, 412 first and second straight pin members 411a, 412a conductor portion 411c mounting piece 42 second coil 420 bent pin member 420a Conductor portion 420b Coatings 421, 422 First and second straight pin members 421a, 422a Conductor portion 421c Mounting piece 51-54 First to fourth external electrodes 51a- 54a Mounting portion 60, 60A Core cover 60u Upper end 60w Lower surface 60s Opposing surface 90 resin member 90u upper end L inductor element (passive element)

Claims (12)

1. a bottom plate;
   a passive element disposed on the bottom plate;
   an external electrode attached to the bottom plate and electrically connected to the passive element;
   a resin member disposed on the bottom plate portion and in contact with the bottom plate portion and the passive element;
   The bottom plate portion has a bottom portion including a first main surface and a second main surface facing each other, and a side wall portion provided along the outer periphery of the bottom portion on the first main surface of the bottom portion,
   The passive element has a conductive portion that can be electrically connected to the outside,
   the passive element is arranged in a concave portion surrounded by the bottom portion and the side wall portion such that the conductive portion is positioned on the first main surface side;
   The electronic component according to claim 1, wherein the resin member is fixed in the concave portion to fix the passive element to the bottom plate portion and to cover at least part of the conductive portion.
2. the bottom has an opening penetrating the first main surface and the second main surface;
   the passive element and the external electrode are electrically connected via the opening;
   2. The electronic component according to claim 1, wherein said resin member further exists within said opening.
3. The electronic component according to claim 1 or 2, further comprising a box portion attached to said bottom plate portion so as to cover said passive element.
4. The passive element is
   an annular core;
   and a coil wound around the core,
   the core is arranged on the bottom plate portion such that the central axis of the core is orthogonal to the first main surface of the bottom portion;
   The coil has a conductor portion and a coating covering a portion of the conductor portion,
   4. The electronic component according to any one of claims 1 to 3, wherein said conductive portion includes said conductor portion exposed from said film.
5. Further comprising a core cover that covers at least a portion of the core on the bottom plate portion side,
   In the height direction orthogonal to the first main surface, the distance between the upper surface and the lower surface of the core is t0, and the distance between the upper end of the core cover and the opposing surface facing the lower surface of the core is t1. When the ratio of the distance t1 of the core cover to the distance t0 of the core is 0.2 or more, and the upper end of the core cover is positioned higher than the upper end of the side wall portion. Electronic parts described in .
6. The electronic component according to claim 5, wherein the lower surface of the core cover is positioned lower than the upper end of the side wall portion in the height direction.
7. The electronic component according to claim 5, wherein the lower surface of the core cover is located higher than the upper end of the side wall portion in the height direction.
8. The electronic component according to any one of claims 5 to 7, wherein the resin member extends to the upper end of the core cover on the outer surface of the core cover.
9. The coil is spirally wound around the core along the circumferential direction viewed from the central axis direction of the core,
   9. The electronic component according to claim 5, wherein said resin member extends between adjacent turns of said coil.
10. 10. The electronic device according to claim 9, wherein an upper end of a portion of said resin member extending between adjacent turns of said coil is located higher than said upper end of said core cover in said height direction. parts.
11. The electronic component according to any one of claims 5 to 10, wherein said resin member is separated from said core without contacting said core.
12. The coil is spirally wound around the core along the circumferential direction viewed from the central axis direction of the core,
    5. The electronic component according to claim 4, wherein said resin member extends between adjacent turns of said coil.

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