JP6733447B2 - Coil parts and coil device - Google Patents

Description

The present invention relates to a coil device used as, for example, an inductor and a coil component arranged inside the coil device.

Various electronic and electric devices are equipped with many coil devices used as inductors and the like. As an example of such a coil device, a coil device disclosed in Patent Document 1, for example, has been developed. In the coil device shown in Patent Document 1, a pair of spiral conductive metal pieces are laminated, and inner ends of the metal pieces are welded and connected to each other.

However, in the conventional coil device, since each metal piece is thin and flat, it is difficult to sufficiently secure the strength of the coil component in which the inner ends of each metal piece are connected to each other. If the strength of the coil parts is insufficient, when the coil parts are transported, or when the coil parts are placed inside the mold and granules containing magnetic powder etc. are compression molded to form a dust core. , Each metal piece is displaced or deformed. Further, when the above-mentioned granules contain metal alloy particles, the metal alloy particles may get into the gaps between the metal pieces and cause a defect such as a short circuit.

JP, 2004-327622, A

The present invention has been made in view of such an actual situation, and an object thereof is to provide a coil component having sufficient strength, a short-circuit failure is less likely to occur, easy transportation, and a coil device having the coil component. Is to provide.

In order to achieve the above object, the coil component according to the present invention,
A first conductive plate piece having a first inner end portion and a first outer end portion and having a two-dimensional first predetermined pattern;
A second conductive plate piece having a second inner end portion and a second outer end portion and having a two-dimensional second predetermined pattern;
Of the plate surfaces of the first conductive plate piece and the second conductive plate piece, an insulating base material that covers at least the plate surface on the side where the first conductive plate piece and the second conductive plate piece face each other. And a coil component having
The first conductive plate piece and the second conductive plate piece are arranged in the stacking direction,
The first conductive plate piece and the second conductive plate piece are integrated via the insulating base material.

In the coil component according to the present invention, of the plate surfaces of the first conductive plate piece and the second conductive plate piece, at least the plate surface on the side where the first conductive plate piece and the second conductive plate piece face each other. It is covered with an insulating base material. Further, the first conductive plate piece and the second conductive plate piece are integrated via an insulating base material.

In this way, the first conductive plate piece and the second conductive plate piece are integrated through the insulating base material to form the coil component, so that the first conductive plate piece and the second conductive plate piece are formed. Is less likely to peel off, the strength is improved, and it is easy to carry and handle. Furthermore, when the coil parts are placed inside the mold and the powder magnetic core is formed by compression molding of granules containing magnetic powder or the like, it is difficult for the metal pieces to be displaced or deformed, and each metal piece is prevented from being displaced. The strips are kept horizontal to each other. Therefore, it is possible to suppress variations in the characteristics (inductance characteristics, etc.) of the coil device.

Further, even when the above-mentioned granules contain metal alloy particles, the insulating base material functions as a protective layer, so that the metal alloy particles enter between the first conductive plate piece and the second conductive plate piece. Hateful.

Further, among the plate surfaces of each conductive plate piece, the plate surface on the side opposite to the side where the first conductive plate piece and the second conductive plate piece face each other is also covered with an insulating base material, so that each insulating substrate The conductive plate pieces can be more firmly integrated through the material. Further, the function of protecting the coil component by the insulating base material is also enhanced.

Preferably, a first inner convex portion protruding from the two-dimensional plane of the first predetermined pattern in a stacking direction is formed on the first inner end portion, and the first inner convex portion is the second inner end portion. It is electrically connected to the section. With this configuration, the first inner convex portion and the second inner end portion are three-dimensionally connected between the first predetermined pattern and the second predetermined pattern. Therefore, gaps are formed between the predetermined patterns, and the conductive base plate pieces can be integrated by interposing the insulating base material in the gaps.

Preferably, at least one of the first predetermined pattern and the second predetermined pattern is a spiral pattern. With this configuration, the number of turns of the coil component can be increased.

Preferably, the first inner end portion and the second inner end portion are arranged at positions radially outward from the center of the spiral pattern. With this configuration, when the first conductive plate piece and the second conductive plate piece are laminated, a hollow portion is formed in the coil component, and the core can be arranged in this hollow portion. As a result, the inductance of the coil device can be further increased and the saturation current characteristic can be improved (the saturation current can be increased). From the viewpoint of increasing the number of turns of the coil, the first inner end portion and the second inner end portion may be arranged at the center of the spiral pattern.

Preferably, the insulating base material contains a resin, and the first conductive plate piece and the second conductive plate piece are integrated with the insulating base material via the resin. With such a configuration, the resin seeps out from the insulating base material and adheres to the first conductive plate piece and the second conductive plate piece to be cured, so that each conductive plate piece is interposed via the resin. Can be firmly integrated. Further, since each conductive plate piece is covered with the resin whose hardness is increased by hardening, the strength of the coil component can be further increased. In addition, it is possible to effectively prevent the conductive plate pieces from coming off from the compression molded body (core) such as magnetic powder filled in the coil device.

Preferably, the resin is filled in a pattern gap formed in either the first predetermined pattern or the second predetermined pattern. That is, the resin leached from the insulating base material is filled in the pattern gaps formed in at least one of the first predetermined pattern and the second predetermined pattern. Then, by curing the resin, the first conductive plate piece and the second conductive plate piece can be more firmly integrated through the resin. Moreover, since the resin functions as a protective layer, it is possible to effectively prevent the above-mentioned metal alloy particles from entering the pattern gap.

An external terminal piece may be integrally formed with the first outer end portion. The external terminal piece is a portion exposed to the outside from a sealing portion in the coil device described later. By integrally molding this portion on the first outer end portion, it is not necessary to separately connect the terminal piece.

The coil component of the present invention is
A third conductive plate piece having a third inner end portion and a third outer end portion, having a two-dimensional third predetermined pattern, and being arranged so as to be laminated with the second conductive plate piece;
An insulating base material that covers at least the plate surface of the third conductive plate piece on the side where the second conductive plate piece and the third conductive plate piece face each other is further included. Good.

Preferably, the second outer end portion is formed with a second outer protrusion protruding from the two-dimensional plane of the second predetermined pattern in the stacking direction,
The second outer protrusion is electrically connected to the third outer end,
The second conductive plate piece and the third conductive plate piece are integrated via an insulating base material that covers the plate surface of the third conductive plate piece.

With this configuration, the number of turns of the coil component can be further increased.

The coil component of the present invention is
A fourth conductive plate piece that has a fourth inner end portion and a fourth outer end portion, has a two-dimensional fourth predetermined pattern, and is arranged so as to be laminated with the third conductive plate piece;
An insulating base material that covers at least the plate surface of the fourth conductive plate piece on the side where the third conductive plate piece and the fourth conductive plate piece face each other is further included. Good.

Preferably, a third inner convex portion is formed at the third inner end portion so as to project from the two-dimensional plane of the third predetermined pattern in the stacking direction,
The third inner convex portion is electrically connected to the fourth inner end portion,
The third conductive plate piece and the fourth conductive plate piece are integrated via an insulating base material that covers the plate surface of the fourth conductive plate piece.

With this configuration, the number of turns of the coil portion can be further increased.

A fourth external terminal piece may be integrally formed with the fourth outer end portion. The fourth external terminal piece is a portion exposed to the outside from a sealing portion in a coil device described later. By integrally molding this portion on the fourth outer end portion, it is not necessary to separately connect the terminal piece.

A pair of the second conductive plate piece and the third conductive plate piece may be repeatedly laminated between the first conductive plate piece and the fourth conductive plate piece. Good. With this configuration, the number of turns of the coil component can be further increased.

Preferably, at least one of the third predetermined pattern and the fourth predetermined pattern is a spiral pattern. With this configuration, the number of turns of the coil component can be further increased.

The insulating base material contains a resin, and the second conductive plate piece and the third conductive plate piece are integrated with the insulating base material that covers the plate surface of the third conductive plate piece through the resin. The third conductive plate piece and the fourth conductive plate piece may be integrated with an insulating base material that covers the plate surface of the fourth conductive plate piece. In this case as well, the same operation and effect as in the case where the first conductive plate piece and the second conductive plate piece are integrated with the insulating base material via the resin described above can be obtained.

A second external terminal piece may be integrally formed with the second outer end portion. The second external terminal piece is a portion exposed to the outside from a sealing portion in a coil device described later. By integrally molding this portion on the second outer end portion, it is not necessary to separately connect the terminal piece.

A coil device according to the present invention includes the coil component described in any one of the above, and a sealing portion that covers a main part of the coil component. The sealing portion may be made of a magnetic material-containing resin. The coil component of the present invention can be easily embedded inside the sealing portion.

FIG. 1 is a schematic perspective view of a coil device according to an embodiment of the present invention. FIG. 2 is a schematic sectional view taken along the line II-II of the coil device shown in FIG. FIG. 3A is a perspective view showing a process of manufacturing the coil component of the coil device shown in FIG. 1. 3B is a perspective view showing a step that follows FIG. 3A. FIG. 3C is a perspective view showing a step following that shown in FIG. 3B. FIG. 3D is a schematic sectional view taken along the line IIID-IIID of the coil device shown in FIG. 3C. FIG. 4A is a schematic perspective view of a coil device according to another embodiment of the present invention. 4B is a schematic sectional view taken along line IVB-IVB of the coil device shown in FIG. 4A. FIG. 5 is an exploded perspective view of coil components of the coil device shown in FIG. 4A. FIG. 6A is a schematic perspective view of a coil device according to another embodiment of the present invention. 6B is a schematic sectional view taken along line VIB-VIB of the coil device shown in FIG. 6A. FIG. 7 is an exploded perspective view of coil components of the coil device shown in FIG. 6A. FIG. 8 is a schematic perspective view of a coil device according to another embodiment of the present invention. 9 is an exploded perspective view of coil components of the coil device shown in FIG.

Hereinafter, the present invention will be described based on the embodiments shown in the drawings.

First Embodiment As shown in FIG. 1, an inductor element 2 as a coil device according to an embodiment of the present invention includes a core portion (sealing portion) 4 as a compression molded body and a coil inside the core portion 4. It has the coil component 6 which comprises. The main part of the coil component 6 is covered with the core portion 4. The main part of the coil component 6 is a part excluding the lead parts 17a, 17b and the external terminal pieces 12a, 12b exposed from the core part 4.

As shown in FIG. 2, the coil component 6 includes a plurality of conductive plate pieces 6a and 6b stacked in the Z-axis direction (stacking direction). In the following embodiment, the first and second conductive plate pieces 6a and 6b are described as being stacked in the Z-axis direction to form the coil component 6, but the present invention is not limited to this.

The first conductive plate piece 6a has a first predetermined pattern 7a that is spiral (spiral) in a two-dimensional plane including the X axis and the Y axis. The first predetermined pattern 7a is formed by forming a spiral first predetermined pattern gap 7a1 in the first conductive plate piece 6a. In this embodiment, the first predetermined pattern gap 7a1 constitutes a spiral groove.

The number of turns of the spiral first predetermined pattern 7a is not particularly limited, but is preferably 1/2 to 10 turns, more preferably 1 to 5 turns. A first inner end 8a is formed at the inner end of the spiral first predetermined pattern 7a, and a first outer end 10a is formed at the outer end of the spiral pattern 7a. Note that the "helix" is not limited to a quadrangle (including rectangle) spiral as viewed from the Z-axis direction, but a circular spiral, an elliptical spiral, other curved shapes, or other polygonal spirals. including.

The first outer end portion 10a is a portion located at the outer end of the first spiral predetermined pattern 7a. In the present embodiment, the first lead portion 17a is integrally formed with the first outer end portion 10a. As shown in FIG. 3B, the first lead portion 17a projects from the first outer end portion 10a in the radial outer direction of the helix (X-axis direction in this embodiment). As shown in FIGS. 1 and 2, the first lead portion 17a is bent in the Z-axis direction along the outer surface of the core portion 4.

The external terminal piece 12a is integrally formed with the lead portion 17a. The external terminal piece 12a is integrally formed with the lead frame 14a shown in FIG. 3B, and the lead frame 14a is removed in a post process. As shown in FIG. 2, the external terminal piece 12a is arranged on the lower surface 4B of the core portion 4, and as shown in FIG. 1, protrudes in the radial inner direction of the spiral (X-axis direction in this embodiment). Have a shape.

In the present embodiment, the tip portion of the first lead portion 17a that protrudes from the core portion 4 and is bent in the Z-axis direction is bent in the X-axis direction along the outer surface of the core portion 4, and the bent tip portion is external. It functions as the terminal piece 12a. In this way, the external terminal piece 12a is integrally formed with the first lead portion 17a, so that it is not necessary to separately connect the external terminal piece 12a. The external terminal piece 12a may be retrofitted to the first lead portion 17a by welding or the like.

As shown in FIG. 3B, in the present embodiment, the first inner end portion 8a is a portion having a width wider than the pattern width of the spiral pattern 7a, and has a substantially rectangular shape. The first inner end portion 8a is integrally formed with a first inner protrusion portion 9a protruding in the stacking direction (Z-axis direction) from a two-dimensional plane having a spiral pattern. The shape of the first inner end portion 8a is not limited to the example shown in the figure, and may be appropriately changed such as being circular. Further, the shape of the first inner convex portion 9a may be changed appropriately. Further, the position of the first inner convex portion 9a may be appropriately changed within the region of the first inner end portion 8a. Further, the first inner convex portion 9a may be retrofitted to the first inner end portion 8a.

As shown in FIG. 3C, the second conductive plate piece 6b has a second predetermined pattern 7b that is spiral in a two-dimensional plane including the X axis and the Y axis. The second predetermined pattern 7b is formed by forming a spiral second predetermined pattern gap 7b1 in the second conductive plate piece 6b. In this embodiment, the second predetermined pattern gap 7b1 constitutes a spiral groove.

The spiral second predetermined pattern 7b is the same as the spiral first predetermined pattern 7a, except that the spiral second predetermined pattern 7b is in the opposite direction from the inside to the outside. That is, as shown in FIG. 3B, the first predetermined pattern 7a has a left-handed spiral shape, and as shown in FIG. 3C, the second predetermined pattern 7b has a right-handed spiral shape. A second inner end 8b is formed on the inner end of the spiral second predetermined pattern 7b, and a second outer end 10b is formed on the outer end of the spiral pattern 7b.

A lead portion 17b is integrally formed with the second outer end portion 10b, and an external terminal piece 12b is integrally formed with the lead portion 17b. The external terminal piece 12b is formed in the opposite direction to the external terminal piece 12a in the X-axis direction, and is connected to a lead frame 14b that will be removed in a later step.

As shown in FIG. 2, the second inner end portion 8b is the same as the first inner end portion 8a except that a protrusion corresponding to the first inner protrusion 9a is not integrally formed. .. Therefore, in the second inner end portion 8b, the plate surface on the side where the first conductive plate piece 6a is arranged has a flat shape. The gap in the Z-axis direction between the first predetermined pattern 7a and the second predetermined pattern 7b is preferably 10 to 100 μm, more preferably 30 to 60 μm. The gap can be controlled by adjusting the height of the first inner convex portion 9a in the Z-axis direction.

Of the plate surfaces of the first conductive plate piece 6a and the second conductive plate piece 6b, at least the plate surface on the side where the first conductive plate piece 6a and the second conductive plate piece 6b face each other is an insulating base material. Is covered with. In the present embodiment, the insulating base material that covers the lower surface of the first conductive plate piece 6a and the upper surface of the second conductive plate piece 6b is referred to as a surface layer insulating base material 16s, and the upper surface of the first conductive plate piece 6a and the second conductive plate piece The insulating base material that covers the lower surface of the conductive plate piece 6b is referred to as an intermediate insulating base material 16m.

In the example shown in FIG. 2, the plate surfaces of the conductive plate pieces 6a and 6b are covered with the surface insulating base material 16s and the intermediate insulating base material 16m, respectively, but the surface insulating base material 16s is not essential, It may be omitted. Further, in the present embodiment, the insulating base materials 16s and 16m are configured by a single layer, but may be configured by a plurality of layers.

As shown in FIG. 1, the surface insulating base material 16s and the intermediate insulating base material 16m have the size of the XY plane which is approximately the same as the plate surfaces of the first conductive plate piece 6a and the second conductive plate piece 6b. However, the size of each insulating base material 16m and 16s may be smaller or larger than this.

However, as shown in FIG. 2, an opening is formed in the central portion of each insulating base material 16s and 16m, specifically, the portion corresponding to the first inner end portion 8a and the second inner end portion 8b. Is preferred. This is for facilitating formation of the joint portion 9ab between the first conductive plate piece 6a and the second conductive plate piece 6b after mounting the surface insulating base material 16s and the intermediate insulating base material 16m. In addition, when the surface layer insulating base material 16s is mounted after forming the joint portion 9ab between the first conductive plate piece 6a and the second conductive plate piece 6b, the central opening may be omitted.

Regarding the intermediate insulating base material 16m, it is difficult to mount it after forming the joint portion 9ab between the first conductive plate piece 6a and the second conductive plate piece 6b, and therefore, before forming the joint portion 9ab. It is preferable to attach between the first conductive plate piece 6a and the second conductive plate piece 6b. By providing the coil component 6 with the intermediate insulating base material 16 m, the conductive paths 15 of the conductive plate pieces 6 a and 6 b forming the coil component 6 can be insulated from each other. In this embodiment, the conductive path 15 has a rectangular cross-sectional shape.

The material of each conductive plate piece 6a and 6b is not particularly limited, but Cu, Al, Fe, Ag, Au, and alloys thereof are exemplified.

The insulating base materials 16s and 16m are each composed of a resin sheet alone, a laminated sheet in which an adhesive resin is laminated on one surface or both surfaces of the resin sheet, or an adhesive resin-containing base material. At least the insulating base material 16m and the first conductive plate piece 6a, and the insulating base material 16m and the second conductive plate piece 6b are integrated via a resin contained in the insulating base material 16m. Further, the resin contained in the insulating base material 16m enters and is filled in the first predetermined pattern gap 7a1 and the second predetermined pattern gap 7b1.

When the insulating base material 16s is provided, the insulating base material 16s and the first conductive plate piece 6a or the second conductive plate piece 6b are integrated with each other through the resin contained in the insulating base material 16s. ing. Further, the resin contained in the insulating base material 16s may enter the first predetermined pattern gap 7a1 and the second predetermined pattern gap 7b1.

The resin contained in the insulating base materials 16s and 16m is not particularly limited, but a thermosetting resin such as an epoxy resin or a urethane resin, a thermoplastic resin such as an acrylic resin or an olefin resin, an acrylate radical polymer, Examples include UV curable resins such as epoxy cationic polymers and thermoplastic polyamide resins. The insulating base materials 16s and 16m preferably include a base material sheet having a uniform thickness even after heat treatment, and the base material sheet includes a mesh-shaped base material sheet, a porous base material sheet, and a woven fabric sheet. Alternatively, a non-woven fabric sheet, or a base material sheet having holes formed therein is preferable.

In the present embodiment, as shown in FIG. 2, the first inner convex portion 9a is electrically connected to the second inner end portion 8b to form the joint portion 9ab. The joint portion 9ab is formed near the centers of the spiral patterns 7a and 7b. As described above, since the opening is formed in the central portion of the intermediate insulating base material 16m, the electrical connection between the first inner convex portion 9a and the second inner end portion 8b is made by the intermediate insulating base material 16m. There is no hindrance. The joint portion 9ab can be formed by stacking the first inner convex portion 9a and the second inner end portion 8b in the stacking direction and irradiating the portion with a laser.

In the present embodiment, as shown in FIG. 3C, the above-described joining is performed in a state where the lead frames 14a and 14b are attached to the conductive plate pieces 6a and 6b, respectively, and then the core portion shown in FIG. 4 may be formed and then the lead frames 14a and 14b may be removed by cutting or the like. Alternatively, the lead frames 14a and 14b may be removed by cutting or the like before the core portion 4 is formed. As shown in FIG. 2, in the present embodiment, the core portion 4 integrally covers the inner peripheral portion and the outer peripheral portion of the coil component 6 and both ends of the winding shaft so as to cover the whole.

The core part 4 is formed by compression molding or injection molding of granules containing magnetic powder and a binder. The magnetic powder is not particularly limited, but Sendust (Fe-Si-Al; iron-silicon-aluminum), Fe-Si-Cr (iron-silicon-chromium), permalloy (Fe-Ni), carbonyl iron-based, Carbon magnetic powder such as carbonyl Ni-based, amorphous powder, and nanocrystal powder is preferably used.

The particle size of the magnetic powder is preferably 0.5 to 50 μm. In the present embodiment, the magnetic powder is metal magnetic particles, and the outer circumference of the particles is preferably coated with an insulating film. Examples of the insulating film include a metal oxide film, a resin film, and a chemical film formed of phosphorus, zinc or the like.

However, the magnetic powder may be ferrite magnetic powder such as Mn-Zn or Ni-Cu-Zn. The binder resin is not particularly limited, but examples thereof include epoxy resin, phenol resin, acrylic resin, polyester resin, polyimide, polyamideimide, silicon resin, and combinations thereof.

In the present embodiment, the external terminal pieces 12a and 12b are integrally formed with either of the conductive plate pieces 6a or 6b that form the coil component 6, and have a width larger than that of the spiral patterns 7a and 7b. It has a large width in the Y-axis direction. The width of the external terminal pieces 12a and 12b in the Y-axis direction is preferably 30 to 100% of the width of the core portion 4 in the Y-axis direction.

In the present embodiment, the lower surface 4B of the core portion 4 is a mounting-side outer surface connected to a circuit board or the like, and is formed substantially parallel to a plane that passes through mutually perpendicular X-axis and Y-axis. Has a winding axis substantially parallel to the Z axis perpendicular to the plane passing through the X axis and the Y axis. In the present embodiment, the upper surface 4A of the core portion 4 is an outer surface on the non-mounting side that is substantially parallel to the lower surface 4B, and the four side surfaces 4C are substantially perpendicular to these upper surface and lower surface. However, the shape of the core portion 4 is not particularly limited and is not limited to a hexahedron, and may be a columnar shape, an elliptic cylinder, a polygonal cylinder, or the like.

Although the size of the inductor element 2 of the present embodiment is not particularly limited, for example, the X-axis direction width X0 is 1.0 to 20 mm, the Y-axis direction width Y0 is 1.0 to 20 mm, and the height Z0 is 1.0 to 10 mm. Is. The inductor element 2 is, for example, a circuit element such as a transformer, a balun, a common mode filter (common mode choke), a DC/DC converter, a choke coil in a power supply line, a decoupling element, an element for impedance matching, and a constituent element of a filter. It can be used as an antenna element or the like.

Next, a method of manufacturing the inductor element 2 shown in FIGS. 1 and 2 will be described. First, a conductive plate piece such as a metal plate (for example, Sn plated material) is punched into a shape as shown in FIG. 3A (stamping step). As shown in FIG. 3A, a plurality of conductive plate pieces 6a connected to the lead frame 14a via the lead portions 17a (including the external terminal pieces 12a) are formed on the punched conductive plate piece. .. Each first conductive plate piece 6a is integrally formed with a first inner convex portion 9a. The first inner convex portion 9a may be formed simultaneously with the punching process, but may be formed in a process different from the punching process.

Next, each first conductive plate piece 6a shown in FIG. 3A is irradiated with a cutting laser beam in a predetermined pattern to form a spiral first predetermined pattern gap 7a1 as shown in FIG. 3B. The spiral first predetermined pattern 7a is formed on the conductive plate piece 6a (laser cutting step). By forming a spiral first predetermined pattern gap 7a1 in each first conductive plate piece 6a shown in FIG. 3A with a laser beam, each first conductive plate piece 6a has a first inner end portion 8a and The first outer end 10a is formed at the same time.

In addition, a wide portion 13 is formed in the middle of the pattern 7a near the first outer end portion 10a. By forming the wide portion 13, it becomes possible to make the outer peripheral shape of the first conductive plate piece 6a and the outer peripheral shape of the second conductive plate piece 6b the same, as shown in FIG. 3C. When the 1st conductive plate piece 6a and the 2nd conductive plate piece 6b are laminated|stacked and it is set as the coil component 6, the strength of the coil component 6 can be improved.

In the above process, the method of forming the first predetermined pattern 7a on the first conductive plate piece 6a has been described, but the method of forming the second predetermined pattern 7b on the second conductive plate piece 6b is also the same, so The description is omitted. However, in order to form the second predetermined pattern 7b on the second conductive plate piece 6b, the same conductive plate piece as shown in FIG. 3C is formed on the same conductive plate piece except that the first inner convex portion 9a shown in FIG. 3A is not provided. 2 The predetermined pattern gap 7b1 may be formed.

Next, as shown in FIG. 3D, as shown in FIG. 3C, so that the first inner convex portion 9a is abutted against the lower surface of the second inner end portion 8b in the Z-axis direction, The second conductive plate piece 6b is laminated (lamination step). Before that, as shown in FIG. 3D, the intermediate insulating base material 16m is attached to the upper surface of each first conductive plate piece 6a or the lower surface of each second conductive plate piece 6b (intermediate insulating base material attaching step), In the step of laminating the first conductive plate piece 6a and the second conductive plate piece 6b, the intermediate insulating base material 16m is sandwiched between them.

If necessary, as shown in FIG. 3D, the surface layer insulating base material 16s is attached to the lower surface of each first conductive plate piece 6a and the upper surface of each second conductive plate piece 6b (attaching surface layer insulating base material). Process). Note that this step is not essential, and may be performed only when it is desired to sufficiently increase the strength of the first conductive plate piece 6a and the second conductive plate piece 6b or to make it resistant to deformation.

Next, laser welding is performed on the joint between the first inner convex portion 9a and the second inner end portion 8b in a state where the second inner end portion 8b is abutted against the first inner convex portion 9a (laser welding step). As a result, as shown in FIG. 3D, the joint portion 9ab is formed in that portion.

The method for forming the joint 9ab is not limited to laser welding, and other methods such as resistance welding, arc welding, ultrasonic welding, soldering, and joining with a conductive paste are exemplified. .. At the time of joining, it is preferable that the lead frames 14a and 14b are attached to the conductive plate pieces 6a and 6b, respectively, but they may be removed.

Next, the resin impregnated in the surface insulating base material 16s and the intermediate insulating base material 16m is melt-cured (melt-hardening step). In this step, the heating temperature is set to, for example, about 80 to 150°C, and the resin impregnated in each insulating base material 16s and 16m is melted. The melted resin enters into the first predetermined pattern gap 7a1 and the second predetermined pattern gap 7b1 and is filled therein.

Thereafter, or simultaneously, the resin with which the insulating base materials 16s and 16m are impregnated and the resin with which the pattern gaps 7a1 and 7b1 are filled are fully cured. As a result, the first conductive plate piece 6a and the second conductive plate piece 6b are integrated with each other via the surface insulating base material 16s and the intermediate insulating base material 16m. In addition, you may implement a melt hardening process prior to a laser cutting process.

Next, the main part of the coil component 6 is inserted into the mold, the lead parts 17a and 17b, etc. are exposed from the mold, and the core part 4 is formed by compression molding in the mold (molding step). At the time of compression molding, a mixture containing magnetic powder and a binder resin is filled in the cavity of the mold and the whole is heated and compressed to obtain the inductor element 2 shown in FIG.

The heating temperature during heating and compression is preferably 50 to 300°C, and the compression pressure is preferably 1 to 400 Pa. As a method for compression molding, a mold may be used, or hydraulic pressure or water pressure may be used. At the time of compression molding, instead of the above-mentioned mixture, only the resin may be filled in the cavity. Further, the molding step may be omitted, and the main part of the coil component 6 may be simply put in the exterior body (sealing portion) and fixed.

Next, the lead frames 14a and 14b shown in FIG. 3C are cut and removed with a cutting tool. In addition, as shown in FIG. 1, the lead portions 17a and 17b protruding from the core portion 4 are bent along the outer surface of the core portion 4 from the side surface 4C of the core portion 4 to the lower surface 4B (cut forming). Process). As a result, the external terminal pieces 12a and 12b are arranged on the lower surface 4B of the core portion 4. In this embodiment, the lower surface 4B of the core portion 4 serves as a mounting surface, and the upper surface of the core portion 4 serves as an anti-mounting surface.

In the coil component 6 according to the present embodiment, the first inner end portion 8a is formed with the first inner convex portion 9a protruding from the two-dimensional plane of the first predetermined pattern 7a in the stacking direction. Further, among the plate surfaces of the first conductive plate piece 6a and the second conductive plate piece 6b, at least the plate surface on the side where the first conductive plate piece 6a and the second conductive plate piece 6b face each other is intermediately insulated. It is covered with a base material 16 m. Further, the first conductive plate piece 6a and the second conductive plate piece 6b are integrated via the intermediate insulating base material 16m.

That is, since the first inner convex portion 9a and the second inner end portion 8b are three-dimensionally connected between the first predetermined pattern 7a and the second predetermined pattern 7b, a gap is formed between each predetermined pattern, By interposing the intermediate insulating base material 16m in this gap, the conductive plate pieces 6a and 6b can be integrated.

As described above, since the first conductive plate piece 6a and the second conductive plate piece 6b are integrated to form the coil component 6 via the intermediate insulating base material 16m, the first conductive plate piece 6a and the second conductive plate piece 6a are formed. The second conductive plate piece 6b is less likely to peel off, the strength is also improved, and it is easy to carry and handle. Further, when the coil component 6 is placed inside the mold and compression molding of granules containing magnetic powder or the like is performed to form a dust core, the metal pieces 6a and 6b are less likely to be displaced or deformed. Therefore, the conductive plate pieces 6a and 6b are maintained horizontal to each other. Therefore, it is possible to prevent variations in the inductance value and the DC superposition characteristic of the inductance element 2 and insulation failure.

Further, since the intermediate insulating base material 16m is interposed between the first predetermined pattern 7a and the second predetermined pattern 7b, it is unlikely that a short circuit defect will occur between the conductive plate pieces 6a and 6b. Even when the above-mentioned granules contain metal alloy particles, the first predetermined pattern gap 7a1 and the second predetermined pattern gap 7b1 are filled with the resin contained in the insulating base material 16m and/or 16s. Therefore, the metal alloy particles are less likely to enter these gaps.

Further, since the lower surface of the first conductive plate piece 6a and the upper surface of the second conductive plate piece 6b are also covered with the surface layer insulating base material 16s, the strength of the coil component 6 can be further increased and the coil component 6 can be further provided. The function of protecting the coil parts during transportation and powder compaction is also enhanced.

Further, in the present embodiment, the intermediate insulating base material 16m and the surface layer insulating base material 16s contain a resin, and the first conductive plate piece 6a and the second conductive plate piece 6b are connected to each insulating base material 16m and 16m via the resin. It is integrated in 16s. With such a configuration, the resin seeps out from the insulating base materials 16m and 16s and adheres to the conductive plate pieces 6a and 6b to be cured, so that the conductive plate pieces 16m and 16s can be firmly integrated.

Further, in the present embodiment, the resin leaching from the insulating base materials 16m and 16s is filled in the first predetermined pattern gap 7a1 and the second predetermined pattern gap 7b1. Therefore, the conductive plate pieces 16m and 16s can be more firmly integrated through the resin. Further, since the resin functions as a protective layer, it is possible to more effectively prevent the metal alloy particles described above from entering the pattern gaps 7a1 and 7b1.

In the present embodiment, at least the insulating base material 16m is made of a base material sheet having voids therein, such as a nonwoven fabric, to obtain the following advantages.

Firstly, in this type of base sheet, various resins penetrate into the inside of the base sheet, so that the insulating base 16m and the conductive plate pieces 6a and 6b are strongly bonded to each other through the resin, and the conductive The peel strength of the plate pieces 6a and 6b can be increased. Secondly, in this type of base material sheet, since the resin content changes depending on the degree of voids, a base material having an appropriate amount of voids depending on the thickness and shape of each conductive plate piece 6a and 6b. By selecting the sheet, the content of the resin with which the base sheet is impregnated can be optimized.

Thirdly, this type of base sheet can be impregnated with a large amount of resin. When the resin cures, the total thickness of the base sheet changes, but the amount of change decreases as the content of the resin increases, so that the quality of fabrication can be stabilized. Fourthly, in this type of base material sheet, the resin can be easily impregnated into both surfaces of the base material. When the resin cures, the total thickness of the base sheet changes, but the sheet thickness uniformity is maintained.

As the insulating base material, it is also possible to use a flat tape-shaped base material on which at least one surface is coated with a resin. For example, as an example, a polyester film having a modified epoxy resin layer formed on both sides thereof can be mentioned. However, in order to produce such an insulating base material, it is necessary to apply a resin to at least one surface of the base material, but if the above-mentioned base material is used, this operation can be omitted. It is also possible to use a sheet made of only a thermoplastic resin or a thermosetting resin as the insulating base material.

In the present embodiment, a semi-cured sheet (for example, prepreg) obtained by impregnating a nonwoven fabric tape with a resin may be used as the insulating base material. Then, this is attached to the lower surface of the first conductive plate piece 6a and the upper surface of the second conductive plate piece 6b and used as the surface insulating base material 16s, and the upper surface of the first conductive plate piece 6a or the second conductive plate piece 6a is used. It may be attached to the lower surface of the plate piece 6b and used as the intermediate insulating base material 16m. When attaching the insulating base materials 16s and 16m, an adhesive layer made of a viscous adhesive is formed on the surface layer of the conductive plate pieces 6a and 6b, and the insulating base materials 16s and 16m are attached to the adhesive layer. You may make it adhere. The adhesive layer may be previously formed on the surfaces of the insulating base materials 16s and 16m.

Further, in the present embodiment, since all the conductive plate pieces 6a and 6b have the spiral patterns 7a and 7b, respectively, the number of turns of the coil component 6 can be increased. Further, in the present embodiment, the external terminal piece 12a is integrally formed on the first outer end portion 10a via the lead portion 17a, and the second outer end portion 10b is formed on the first outer end portion 10b via the lead portion 17b. Two external terminal pieces 12b are integrally formed. The external terminal pieces 10a and 10b are portions exposed from the core portion (sealing portion) 4 to the outside. By integrally molding these portions on any of the conductive plate pieces, it is not necessary to separately connect the terminal pieces.

Furthermore, in the above-described embodiment, the first lead portion 17a is integrally molded with the first outer end portion 10a, so that it is not necessary to separately connect the first lead portion 17a. The first lead portion 17a may be retrofitted to the first outer end portion 10a by welding or the like. Further, the shape of the first outer end portion 10a is not limited to the example shown in the figure, and may be appropriately changed such as being circular. The second lead portion 17b and the second outer end portion 10b are similar to the first lead portion 17a and the first outer end portion 10a.

Further, in the above-described embodiment, the method for processing the metal plate (including the metal foil) forming the conductive plate piece 6a (similarly for 6b) shown in FIG. 3A is not limited to punching, but etching, Wire cutting, laser processing, electric discharge processing, drilling, etc. are illustrated. Further, the processing method for forming the predetermined pattern gaps 7a1 and 7b1 is not limited to laser processing, and punching processing, etching processing, wire cutting, electric discharge processing, drilling and the like are exemplified.

Second Embodiment As shown in FIGS. 4A, 4B and 5, the inductor element 102 according to the present embodiment is the same as the inductor element 2 according to the first embodiment except that the configuration of the coil component 106 is slightly different. is there. In the coil component 106 of the present embodiment, the positions of the first inner end portion 108a and the second inner end portion 108b formed on the first conductive plate piece 106a and the second conductive plate piece 106b are the same as those of the first embodiment. The positions are different from the positions of the first inner end portion 8a and the second inner end portion 8b of the shape. Further, in the surface insulating base material 116s and the intermediate insulating base material 116m of the present embodiment, the opening area of the opening formed in the central portion is the opening formed in the insulating bases 16s and 16m of the first embodiment. Different from the opening area of.

Hereinafter, parts different from the first embodiment will be described in detail, and description of common parts will be omitted. In the members shown in the drawings, common members are designated by common reference numerals, and the description thereof will be partially omitted.

In the present embodiment, the first inner end portion 108a is arranged at a position radially outward from the center of the spiral first predetermined pattern 107a. Further, the second inner end portion 108b is arranged at a position distant radially outward from the center of the second spiral predetermined pattern 107b. Therefore, no pattern is formed near the center of the first predetermined pattern 107a and the second predetermined pattern 107b. The first predetermined pattern 107a is formed by forming the first predetermined pattern gap 107a1 in the first conductive plate piece 106a. In this embodiment, the first predetermined pattern gap 107a1 constitutes a spiral groove of the spiral pattern 107a.

The second predetermined pattern 107b is formed by forming the second predetermined pattern gap 107b1 in the second conductive plate piece 106b. In this embodiment, the second predetermined pattern gap 107b1 constitutes a spiral groove of the spiral pattern 107b. The joint portion 109ab illustrated in FIG. 4B is formed by abutting the first inner convex portion 109a formed on the first inner end portion 108a and the second inner end portion 108b and performing laser welding or the like.

The surface insulating base material 116s and the intermediate insulating base material 116m have openings larger than the openings formed in the surface insulating base material 116s and the intermediate insulating base material 116m. It is about the same as the area.

The coil component 106 according to the present embodiment also has the same operational effect as the coil component 6 of the first embodiment. In addition, with the above-described configuration, when the first conductive plate piece 106a, the second conductive plate piece 106b, the surface insulating base material 116s and the intermediate insulating base material 116m are stacked, the coil component 106 shown in FIG. And a hollow portion as shown in FIG. 4B is formed, and the core portion 4 can be arranged in this hollow portion. Therefore, the inductance of the inductance element 102 can be increased and the saturation current characteristic can be improved (the saturation current can be increased). The coil component 106 may be used as an air-core coil without disposing the core portion 4 in the hollow portion. The core portion is not limited to the one formed by powder compaction together with the coil component 106, but a toroidal core, an EI core, or the like formed separately from the coil component 106 can be exemplified.

Third Embodiment As shown in FIGS. 6A, 6B and 7, the inductor element 202 according to the present embodiment is the same as the inductor element 102 according to the second embodiment except that the configuration of the coil component 206 is slightly different. is there. In the present embodiment, the shapes of the first inner end portion 208a and the second inner end portion 208b are different from the shapes of the first inner end portion 108a and the second inner end portion 108b of the second embodiment. Hereinafter, parts different from the second embodiment will be described in detail, and description of common parts will be omitted. In the members shown in the drawings, common members are designated by common reference numerals, and the description thereof will be partially omitted.

As is clear from comparison between FIG. 6B and FIG. 4B, the first inner end portion 208a and the second inner end portion 208b of the present embodiment have the first inner end portion 108a and the second inner end portion that have a protrusion width in the Y direction. It is formed to be smaller than the protruding width of the portion 108b. Specifically, the first inner end portion 208a and the second inner end portion 208b have a point on the first inner convex portion 109a (in the example shown, substantially the center of the first inner convex portion 109a) on the XZ plane. It has a shape that cuts in parallel. That is, the first inner protrusion 209a is formed such that the protrusion width in the Y-axis direction is smaller than the protrusion width of the first inner protrusion 109a. Due to the above-described configuration, an area where no pattern is formed, which is larger than the first predetermined pattern 107a and the second predetermined pattern 107b, is formed near the center of the first predetermined pattern 207a and the second predetermined pattern 207b.

The coil component 206 according to the present embodiment also has the same effects as the coil component 106 according to the second embodiment. In addition, with the above configuration, when the first conductive plate piece 206a, the second conductive plate piece 206b, the surface insulating base material 116s, and the intermediate insulating base material 116m are laminated, the coil component 206 has a coil component. A hollow portion larger than 106 is formed, and a core portion having a larger diameter than the core portion in the second embodiment can be arranged in this hollow portion.

Fourth Embodiment As shown in FIGS. 8 and 9, the inductor element 302 according to the present embodiment is the same as the inductor element 202 according to the third embodiment except that the configuration of the coil component 306 is different. The coil component 306 of this embodiment has four conductive plate pieces. Hereinafter, parts different from the third embodiment will be described in detail, and description of common parts will be omitted. In the members shown in the drawings, common members are designated by common reference numerals, and the description thereof will be partially omitted.

As shown in FIG. 9, the second conductive plate piece 306b has a second predetermined pattern 307b having a spiral shape (spiral shape) in a two-dimensional plane including the X axis and the Y axis. It is arranged above Z-axis direction of 306b. The second predetermined pattern 307b is formed by forming the second predetermined pattern gap 307b1 in the second conductive plate piece 306b. In the present embodiment, the second predetermined pattern gap 307b1 constitutes a spiral groove of the spiral pattern 307b. In the second conductive plate piece 306b, the lead portion 17b and the external terminal piece 12b are not formed on the second outer end portion 310b, and the second outer convex portion 311b is integrally formed. It is similar to the second conductive plate piece 206b of the third embodiment. The second outer convex portion 311b projects in the stacking direction (Z-axis direction) from the two-dimensional plane of the spiral pattern 307b.

The third conductive plate piece 306c has a third predetermined pattern 307c that is spiral (spiral) in a two-dimensional plane including the X axis and the Y axis, and is located above the third conductive plate piece 306c in the Z axis direction. It is located at. The third predetermined pattern 307c is formed by forming the third predetermined pattern gap 307c1 in the third conductive plate piece 306c. In the present embodiment, the third predetermined pattern gap 307c1 constitutes a spiral groove of the spiral pattern 307c. The spiral third predetermined pattern 307c is the same as the spiral second predetermined pattern 307b, except that the spiral third predetermined pattern 307c is a spiral pattern in the opposite direction from the inside to the outside. However, a third inner end 308c is formed at the inner end of the spiral third predetermined pattern 307c, and a third outer end 310c is formed at the outer end of the spiral pattern 307c. ..

The third inner end 308c is integrally formed with a third inner protrusion 309c protruding in the stacking direction (Z-axis direction) from a two-dimensional plane having a spiral pattern. The second outer convex portion 311b is electrically connected to the third outer end portion 310c. An intermediate insulating base material 116m is attached to the upper surface of the second conductive plate piece 306b or the lower surface of the third conductive plate piece 306c. Therefore, the second electrically conductive plate piece 306b and the third electrically conductive plate piece 306c cover the lower surface of the third electrically conductive plate piece 306c, and the intermediate insulating base material 116m (to be precise, seeps from the intermediate insulating base material 116m). It is integrated via resin).

The fourth conductive plate piece 306d has a fourth predetermined pattern 307d that is spiral (spiral) in a two-dimensional plane including the X axis and the Y axis, and is located above the fourth conductive plate piece 306d in the Z axis direction. It is located at. The fourth predetermined pattern 307d is formed by forming a fourth predetermined pattern gap 307d1 in the fourth conductive plate piece 306d. In the present embodiment, the fourth predetermined pattern gap 307d1 constitutes a spiral groove of the spiral pattern 307d. The spiral fourth predetermined pattern 307d is the same as the spiral third predetermined pattern 307c, except that the spiral fourth predetermined pattern 307d is opposite from the outside toward the inside. However, a fourth inner end 308d is formed on the inner end of the spiral fourth predetermined pattern 307d, and a fourth outer end 10d is formed on the outer end of the spiral pattern 307d. ..

The lead portion 17d and the external terminal piece 12d are integrally formed on the fourth outer end portion 10d. The fourth outer end portion 10d is similar to the second outer end portion 10b, and the lead portion 17d and the external terminal piece 12d are similar to the lead portion 17b and the external terminal piece 12b. The third inner convex portion 309c is similar to the second inner convex portion 209a, and is electrically connected to the fourth inner end portion 308d. An intermediate insulating base material 116m is attached to the upper surface of the third conductive plate piece 306c or the lower surface of the fourth conductive plate piece 306d. Therefore, the third conductive plate piece 306c and the fourth conductive plate piece 306d cover the lower surface of the fourth conductive plate piece 306d, and the intermediate insulating base material 116m (to be precise, seeps from the intermediate insulating base material 116m). It is integrated via resin). Further, the fourth conductive plate piece 306d is integrated via a surface layer insulating base material 116s (more precisely, a resin leached from the surface layer insulating base material 116s) covering the upper surface of the fourth conductive plate piece 306d. ing.

The coil component 306 according to the present embodiment also has the same effect as the coil component 206 according to the third embodiment. In addition, in this embodiment, the number of turns of the coil component 306 can be further increased.

A plurality of pairs of second conductive plate pieces 306b and third conductive plate pieces 306c are repeatedly laminated between the first conductive plate piece 206a and the fourth conductive plate piece 306d. Good. With this configuration, the number of turns of the coil component 306 can be further increased.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention.

For example, in the embodiment shown in FIGS. 1, 2 and 3A to 3D, the coil component 6 is formed by stacking the first conductive plate piece 6a and the second conductive plate piece 6b in the Z-axis direction. However, the third to fourth conductive plate pieces or more conductive plate pieces are laminated on the second conductive plate piece 6b shown in FIG. 3C in a manner as shown in FIG. Good.

In this case, the fourth outer terminal piece may be integrally formed with the fourth outer terminal piece. The fourth external terminal piece is a portion exposed to the outside from a sealing portion in a coil device described later. By integrally molding this portion on the fourth outer end portion, it is not necessary to separately connect the terminal piece. The fourth external terminal piece is similar to the external terminal piece 12b shown in FIG.

In addition, a pair of the second conductive plate piece and the third conductive plate piece may be repeatedly laminated between the first conductive plate piece and the fourth conductive plate piece. .. With this configuration, the number of turns of the coil component can be further increased.

2, 102 to 302... Inductor element (coil device)
4... Core part (sealing part)
4A... Upper surface 4B... Lower surface 4C... Side surface 6, 106-306... Coil parts 6a, 106a, 206a... 1st conductive plate piece 6b, 106b, 206b, 306b... 2nd conductive plate piece 306c... 3rd conductive plate Piece 306d... Fourth conductive plate piece 7a, 107a, 207a... First predetermined pattern 7a1, 107a1, 207a1... First predetermined pattern gap 7b, 107b, 207b, 307b... Second predetermined pattern 7b1, 107b1, 207b1, 307b1... Second predetermined pattern gap 307c... Third predetermined pattern 307c1... Third predetermined pattern gap 307d... Fourth predetermined pattern 307d1... Fourth predetermined pattern gap 8a, 108a, 208a... First inner end portion 8b, 108b, 208b... Second Inner end portion 308c... Third inner end portion 308d... Fourth inner end portion 9a, 109a, 209a... First inner convex portion 309c... Third inner convex portion 9ab, 109ab, 209ab... Join portion 10a... First outer end portion 10b, 310b... 2nd outer side edge part 310c... 3rd outer side edge part 10d... 4th outer side edge part 311b... 2nd outer side convex part 12a, 12b, 12d... External terminal piece 13... Wide part 14a, 14b... Lead frame 15 Conductive paths 16s, 116s... Surface insulating base materials 16m, 116m... Intermediate insulating base materials 17a, 17b, 17d... Lead portions

Claims (9)

A first conductive plate piece having a first inner end portion and a first outer end portion and having a two-dimensional first predetermined pattern;
A second conductive plate piece having a second inner end portion and a second outer end portion and having a two-dimensional second predetermined pattern;
Of the plate surfaces of the first conductive plate piece and the second conductive plate piece, an intermediate insulating substrate that covers at least the plate surface on the side where the first conductive plate piece and the second conductive plate piece face each other. A coil component having a material,
The first conductive plate piece and the second conductive plate piece are arranged in the stacking direction, and the first conductive plate piece and the second conductive plate piece are interposed via the intermediate insulating base material. Integrated ,
The intermediate insulating base material includes a base material sheet having voids inside, and a resin,
The resin leached from the gap fills a pattern gap formed in either the first predetermined pattern or the second predetermined pattern, and the first conductive plate piece and the first conductive plate piece 2 A coil component in which the first conductive plate piece and the second conductive plate piece are integrated with the intermediate insulating base material via the resin by being attached to the conductive plate piece and cured . The first inner end portion is formed with a first inner protrusion protruding in the stacking direction from the two-dimensional plane of the first predetermined pattern,
The coil component according to claim 1, wherein the first inner convex portion is electrically connected to the second inner end portion. The coil component according to claim 1, wherein at least one of the first predetermined pattern and the second predetermined pattern is a spiral pattern. The coil component according to claim 3, wherein the first inner end portion and the second inner end portion are arranged at positions radially outward from a center of the spiral pattern. A third conductive plate piece having a third inner end portion and a third outer end portion, having a two-dimensional third predetermined pattern, and being arranged so as to be laminated with the second conductive plate piece;
Among the plate surfaces of the third conductive plate piece, at least the intermediate insulating base material that covers the plate surface on the side where the second conductive plate piece and the third conductive plate piece face each other,
A second outer convex portion is formed on the second outer end portion so as to project from the two-dimensional plane of the second predetermined pattern in the stacking direction,
The second outer protrusion is electrically connected to the third outer end,
Said second conductive plate piece and said third conductive plate piece is claim 1 are integrated through the intermediate insulating substrate that covers the plate surface of the third conductive plate piece Coil parts described in. A fourth conductive plate piece that has a fourth inner end portion and a fourth outer end portion, has a two-dimensional fourth predetermined pattern, and is arranged so as to be laminated with the third conductive plate piece;
Among the plate surfaces of the fourth conductive plate piece, at least the intermediate insulating base material that covers the plate surface on the side where the third conductive plate piece and the fourth conductive plate piece face each other,
A third inner convex portion is formed on the third inner end portion so as to project from the two-dimensional plane of the third predetermined pattern in the stacking direction,
The third inner convex portion is electrically connected to the fourth inner end portion,
The coil component according to claim 5 , wherein the third conductive plate piece and the fourth conductive plate piece are integrated via the intermediate insulating base material that covers the plate surface of the fourth conductive plate piece. .. The second conductive plate piece and the third conductive plate piece are provided between the first conductive plate piece and the fourth conductive plate piece.
The coil component according to claim 6 , wherein a pair with the conductive plate piece is repeatedly laminated. A coil component according to any one of claims 1 to 7 ,
A coil device comprising: a sealing portion that covers a main part of the coil component. The coil device according to claim 8 , wherein the sealing portion is made of a magnetic material-containing resin.

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