WO2017188077A1

WO2017188077A1 - Inductor component

Info

Publication number: WO2017188077A1
Application number: PCT/JP2017/015670
Authority: WO
Inventors: 喜人大坪
Original assignee: 株式会社村田製作所
Priority date: 2016-04-25
Filing date: 2017-04-19
Publication date: 2017-11-02
Also published as: JP6607312B2; JPWO2017188077A1

Abstract

Provided is an inductor component that is small and has excellent characteristics. Outer-winding upper wiring parts 2c and inner-winding upper wiring parts 2a are each arranged at equal intervals along the peripheral direction of a coil core 4. End faces 31c of outer-winding inner-peripheral metal pins and end faces 31a of inner-winding inner-peripheral metal pins are arranged so as to at least partially overlap in an annular first region 5 positioned on the inner peripheral side of the coil core 4. End faces 31d of outer-winding outer-peripheral metal pins and end faces 31b of inner-winding outer-peripheral metal pins are arranged so as to at least partially overlap in an annular second region 6 positioned on the outer peripheral side of the coil core 4. When viewed in a superimposed state, the outer-winding upper wiring parts 2c and the inner-winding upper wiring parts 2a are alternately arranged, and the outer-winding upper wiring parts 2c are disposed so as not to overlap with adjacent inner-winding upper wiring parts 2a.

Description

Inductor parts

The present invention relates to an inductor component including a resin layer and an inductor electrode.

Conventionally, as shown in FIG. 8, an inductor component 100 in which a coil 102 is provided on a core substrate 101 formed of a printed board or a prepreg is known (see, for example, Patent Document 1).
In this case, an annular magnetic layer 103 is disposed inside the core substrate 101, and the coil 102 is spirally wound around the magnetic layer 103. The coil 102 includes a plurality of inner interlayer connection conductors 102a arranged along the inner periphery of the magnetic layer 103, and the outer periphery of the magnetic layer 103 so as to form a plurality of pairs with the inner interlayer connection conductors 102a. A plurality of arranged outer interlayer connection conductors 102b, a plurality of upper wiring patterns 102c connecting the upper ends of predetermined inner interlayer connection conductors 102a and outer interlayer connection conductors 102b, respectively, and predetermined inner interlayer connection conductors 102a and outer sides, respectively. A plurality of lower wiring patterns 102d connecting the lower ends of the interlayer connection conductors 102b. Here, each of the

interlayer connection conductors

102 a and 102 b is formed of a through-hole conductor in which a conductor film is formed on the inner surface of a through hole that penetrates the core substrate 101. Each of the

wiring patterns

102c and 102d is formed with a printed pattern using a conductive paste.

Japanese Patent Laid-Open No. 2000-40620 (see paragraph 0018, FIG. 1, etc.)

With the recent downsizing and high functionality of electronic devices, there is a demand for miniaturization and high functionality of inductor components mounted on them. One measure for improving the characteristics of the inductor component is to reduce the resistance value of the inductor electrode (the coil 102 in the above-described inductor component 100). However, in the conventional inductor component 100, each of the

interlayer connection conductors

102a and 102b constituting the coil 102 is formed of a through-hole conductor in which a conductor film is formed on the inner surface of the through hole. There is a limit to reducing the connection resistance with the side wiring pattern 102d. Here, if the through hole is filled with a conductive paste to form a via conductor, the connection resistance can be lowered. However, the conductive paste is generally formed by mixing a metal filler in an organic solvent or the like. In addition, since voids and gaps are generated in the metal part, in this case, the specific resistance is higher than that of pure metal. Similarly, the

wiring patterns

102c and 102d are also formed of a conductive paste, and it is difficult to reduce the resistance of the entire inductor electrode. As another measure for improving the characteristics of the inductor component, it is conceivable to increase the number of turns of the coil 102. However, if the number of turns of the coil 102 is increased with the conventional inductor component 100, the

wiring patterns

102c and 102d are changed. There is a problem that the inductor component 1a02 has a high resistance value and a low characteristic.

The present invention has been made in view of the above-described problems, and an object thereof is to provide a small and excellent inductor component.

In order to achieve the above object, an inductor component of the present invention includes a resin layer having a main surface and an inductor electrode wound around a winding axis set inside the resin layer, the inductor The electrode has an inner winding portion and an outer winding portion, and the inner winding portion is disposed on one side with respect to the winding axis when viewed from a direction perpendicular to the main surface. And a plurality of wires arranged on the other side with respect to the winding axis and arranged side by side in the winding axis direction on one side of the winding axis in a direction perpendicular to the main surface When viewed from a direction perpendicular to the first wiring portion and the main surface, one end is disposed on the one side with respect to the winding shaft and the other end is with respect to the winding shaft The main surface is arranged on the other side and forms a plurality of pairs with each of the first wiring portions. On the other side of the winding axis in the vertical direction, a plurality of second wiring portions for wiring arranged side by side in the winding axis direction, the one end of each of the first wiring portions, and the first A plurality of first metal pins that connect the one end of the second wiring part that forms a pair with the wiring part, the other end of each of the first wiring parts, and the second that forms a pair with the first wiring part A plurality of second metal pins that connect the other end of the second wiring portion adjacent to the wiring portion, and the outer winding portion has one end when viewed from a direction perpendicular to the main surface. Is disposed on the one side with respect to the winding shaft and the other end is disposed on the other side with respect to the winding shaft, and the one of the winding shafts in a direction perpendicular to the main surface At a position farther from the winding axis than the first wiring portions, and arranged side by side in the winding axis direction. When viewed from a direction perpendicular to the main surface and the plurality of third wiring portions for wiring, one end is disposed on the one side with respect to the winding shaft and the other end is the winding. The other side of the winding shaft in a direction perpendicular to the main surface so as to form a plurality of pairs with each of the third wiring portions, and disposed on the other side with respect to the rotation axis, A plurality of fourth wiring portions for wiring arranged in the winding axis direction at positions farther from the winding shaft than the second metal plates; and the one ends of the third wiring portions; A plurality of third metal pins that connect the one end of the fourth wiring portion paired with the third wiring portion, the other end of each of the third wiring portions, and a pair of the third wiring portion. A plurality of fourth metal pins connecting the other end of the fourth wiring part adjacent to the fourth wiring part formed; The first metal pin and the third metal pin are regions set on the one side of the winding shaft when viewed from a direction perpendicular to the main surface, and have a predetermined width and The first region extending in a direction parallel to the winding axis is arranged so as to at least partially overlap, and the predetermined width of the first region is the first metal pin or the third metal pin. The second metal pin and the fourth metal pin are located on the other side of the winding shaft when viewed from a direction perpendicular to the main surface. The set region is arranged to overlap at least partly in a second region extending in a direction parallel to the winding axis with a predetermined width, and the predetermined width of the second region The maximum width of the cross-section of one metal pin out of two metal pins and each of the fourth metal pins The first wiring portions and the third wiring portions are alternately arranged in the direction of the winding axis so as not to overlap each other when viewed from a direction perpendicular to the main surface. It is characterized by that.

According to this configuration, by forming a part of the inductor electrode with the first to fourth metal pins having a specific resistance lower than that of the conductive paste or plating, the resistance of the entire inductor electrode can be reduced. The characteristics (for example, inductance value) of the inductor component can be improved. In addition, the inductor electrode has a three-dimensional wiring structure (multiple winding structure) having an inner winding portion and an outer winding portion, so that, for example, each first wiring portion and each third wiring portion are formed on the same surface. Compared to the case, the resistance value can be lowered by widening the pattern width of each wiring portion. In addition, when the inductor electrode has a multiple winding configuration having an inner winding portion and an outer winding portion, the wiring pattern of the inner winding portion and the wiring pattern of the outer winding portion overlap each other, thereby generating unnecessary parasitic capacitance and degrading the inductor characteristics. There is a case. Therefore, by arranging the first wiring portions and the third wiring portions so as not to overlap each other, the parasitic capacitance caused by the overlapping of both wiring portions can be reduced, so that the characteristics of the inductor electrode can be improved. it can. Further, when the above-described conventional inductor electrode has a multi-winding structure, since the interlayer connection conductor of the outer winding portion is disposed outside the coil core than the interlayer connection conductor of the inner winding portion, there is a problem that the size of the inductor component is increased. However, it is possible to prevent an increase in size of the inductor component by arranging each metal pin so as to at least partially overlap the first region or the second region. That is, an inductor component having a small size and excellent characteristics can be provided. In addition, since it is not necessary to form through-hole conductors and via-hole conductors as in the prior art, a small and excellent inductor component can be manufactured at low cost.

The winding axis may be circular when viewed from a direction perpendicular to the main surface, and an annular coil core may be disposed on the winding axis. In this case, the inductance value of the inductor electrode can be effectively increased.

The second wiring portions and the fourth wiring portions are alternately arranged in the direction of the winding axis so as not to overlap each other when viewed from a direction perpendicular to the main surface. It may be. In this case, the wiring portions are arranged not to overlap each other not only on one side of the winding shaft in the direction perpendicular to the main surface but also on the other side, and thus occur between the wiring portions of the inductor electrode. The parasitic capacitance can be further reduced.

Each of the first wiring portions, the second wiring portions, the third wiring portions, and the fourth wiring portions is at least when viewed from a direction perpendicular to the main surface. The one end may be formed so as to reach the periphery of the resin layer. According to this configuration, since the metal part of the inductor component increases, the heat dissipation of the inductor component can be improved. In addition, since one end of each wiring portion reaches the periphery of the resin layer, a part of each wiring portion is exposed from the resin layer, so that heat accumulated in the resin layer is easily radiated.

Further, each of the first wiring portions, the second wiring portions, the third wiring portions, and the fourth wiring portions may be formed of a metal plate. According to this configuration, the resistance value of the entire inductor component can be lowered by forming each wiring portion with a metal plate having a low specific resistance.

Each of the first wiring portions, the second wiring portions, the third wiring portions, and the fourth wiring portions may be formed by plating. According to this configuration, since general plating can be used as a method for forming a wiring pattern, for example, each wiring portion can be formed by a wiring pattern on a wiring board, which is practical.

The inductor electrode may have a multiple winding structure of two or more windings. In this case, the number of windings of the inductor electrode can be increased.

When each of the second wiring portions and each of the fourth wiring portions has an overlapping portion, the distance between each of the second wiring portions and each of the fourth wiring portions is the distance between each of the first wiring portions and each of the fourth wiring portions. It may be larger than the distance to the three wiring portions. In this case, since there is a portion where each second wiring portion and each fourth wiring portion overlap each other, there is a possibility that parasitic capacitance may be generated. However, the distance between each second wiring portion and each fourth wiring portion may be different from each other. By making the distance larger than the distance between one wiring portion and each third wiring portion, the generation of parasitic capacitance can be reduced.

According to the present invention, by forming a part of the inductor electrode with the first to fourth metal pins having a specific resistance lower than that of the conductive paste or plating, the resistance of the entire inductor electrode can be reduced. The characteristics (for example, inductance value) of the inductor component can be improved. In addition, by arranging each first wiring portion and each third wiring portion so as not to overlap each other, the parasitic capacitance caused by the overlapping of both wiring portions can be reduced, so the characteristics of the inductor electrode are improved. can do. Furthermore, although not shown, multiple winding can be realized by developing this structure.

It is sectional drawing of the inductor component concerning 1st Embodiment of this invention. It is a figure for demonstrating the inductor electrode of FIG. It is a figure which shows the upper side wiring part of the inductor electrode of FIG. It is a figure which shows the lower side wiring part of the inductor electrode of FIG. It is a figure for demonstrating the inductor electrode concerning 2nd Embodiment of this invention. It is a figure which shows the upper side wiring part of the inductor electrode of FIG. It is a figure which shows the lower side wiring part of the inductor electrode of FIG. It is a perspective view of the conventional inductor component.

<First Embodiment>
An inductor component according to a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of the inductor electrode. FIG. 2 is a perspective view of the inductor electrode and shows a wiring structure. 3A is a plan view of the outer winding upper wiring portion, FIG. 3B is a plan view of the inner winding upper wiring portion, and FIG. 3C is an outer winding upper wiring portion and an inner winding upper wiring portion. 4 (a) is a plan view of the inner winding lower wiring portion, FIG. 4 (b) is a plan view of the outer winding lower wiring portion, and FIG. 4 (c) is an inner winding lower wiring. It is the top view which accumulated the part and the outer winding lower wiring part.

The inductor component 1a of this embodiment includes an inductor electrode 7, a coil core 4, and a resin layer 11, and is mounted on a mother board of an electronic device such as a portable terminal device, for example.

The coil core 4 is formed in a ring shape (see FIG. 3A), and is formed of a magnetic material that is employed as a general coil core such as a Ni—Zn series or Mn—Zn series ferrite. The resin layer 11 includes a first resin layer 11a, a second resin layer 11b, and a third resin layer 11c. The second resin layer 11b is laminated on the upper surface of the first resin layer 11a, and the third resin layer 11c. Is laminated on the lower surface of the first resin layer 11a. Each of the resin layers 11a to 11c can be formed of various materials generally used as a sealing resin such as an epoxy resin.

As shown in FIG. 2, the inductor electrode 7 has a so-called multiple winding configuration including an inner winding portion 7 a and an outer winding portion 7 b, and is a winding set inside the resin layer 11 and in the circumferential direction of the coil core 4. Winding around the rotation axis WA (see FIG. 3A). The inner winding portion 7a of the inductor electrode 7 includes a plurality of inner winding upper wiring portions 2a (corresponding to the “first wiring portion” of the present invention) and a plurality of inner winding lower wiring portions 2b (the “second wiring” of the present invention). A plurality of inner winding inner metal pins 3a (corresponding to “first metal pins” of the present invention) and a plurality of inner winding outer metal pins 3b (“second metal pins of the present invention”). ”).

Each of the inner winding upper wiring portions 2a is disposed on the upper side of the coil core 4 (corresponding to “one side of the winding axis in the direction perpendicular to the main surface” of the present invention). The one end is disposed on the inner peripheral side of the coil core 4 and the other end is disposed on the outer peripheral side of the coil core 4, and is arranged side by side in the winding axis WA direction (the circumferential direction of the coil core 4). At this time, each inner winding upper wiring portion 2a is formed on the upper surface of the first resin layer 11a, and each inner winding upper wiring portion 2a is arranged on the same plane.

Each inner winding lower wiring portion 2b has a plurality of inner winding upper wiring portions 2a and a plurality of inner winding upper wiring portions 2a on the lower side of the coil core 4 (corresponding to “the other side of the winding shaft in the direction perpendicular to the main surface” of the present invention). It is provided to make a pair. At this time, each inner winding lower wiring portion 2b has one end disposed on the inner peripheral side of the coil core 4 and the other end of the coil core 4 when viewed in plan, like each inner winding upper wiring portion 2a. In a state of being arranged on the outer peripheral side, they are arranged side by side in the winding axis WA direction (circumferential direction of the coil core 4). At this time, each inner winding lower wiring portion 2b is formed on the lower surface of the first resin layer 11a, and each inner winding lower wiring portion 2b is arranged on the same plane.

Each inner winding inner peripheral side metal pin 3a connects one end of a pair of inner winding upper wiring portion 2a and inner winding lower wiring portion 2b that form a pair. In this embodiment, each inner winding inner peripheral side metal pin 3 a is formed in a columnar shape, and is arranged so that the length direction is substantially perpendicular to the upper surface of the resin layer 11. Moreover, each inner volume inner peripheral side metal pin 3a has an upper end surface connected to the inner winding upper wiring portion 2a to be connected and a lower end surface connected to the inner winding lower wiring portion 2b to be connected. Moreover, each inner winding inner peripheral side metal pin 3a is arranged so that the entire end face can be accommodated in the first region 5 on the inner peripheral side of the coil core 4 in plan view (see FIG. 3B). The first region 5 will be described later.

Each inner winding outer metal pin 3b includes the other end of one inner winding upper wiring portion 2a and the other end of the inner winding lower wiring portion 2b adjacent to the inner winding lower wiring portion 2b that forms a pair with the other inner winding upper wiring portion 2a. And connect. In this embodiment, each inner winding outer peripheral side metal pin 3b is formed in a columnar shape, and the length direction is substantially perpendicular to the upper surface of the resin layer 11, similarly to each inner winding inner peripheral side metal pin 3a. It is arranged to become. Each inner winding outer peripheral side metal pin 3b has an upper end surface connected to the inner winding upper wiring portion 2a to be connected and a lower end surface connected to the inner winding lower wiring portion 2b to be connected. Moreover, each inner winding outer peripheral side metal pin 3b is arranged so that the entire end face can be accommodated in the second region 6 on the outer peripheral side of the coil core 4 in plan view (see FIG. 3B). The second region 6 will be described later. With these configurations, the inner winding portion 7 a of the inductor electrode 7 that spirally winds around the coil core 4 is formed.

As shown in FIG. 2, the outer winding portion 7b of the inductor electrode 7 includes a plurality of outer winding upper wiring portions 2c (corresponding to the “third wiring portion” of the present invention) and a plurality of outer winding lower wiring portions 2d ( Corresponding to the “fourth wiring portion” of the present invention, a plurality of outer winding inner peripheral metal pins 3c (corresponding to the “third metal pin” of the present invention), and a plurality of outer winding outer peripheral metal pins 3d (this Equivalent to the “fourth metal pin” of the invention.

Each outer-winding upper wiring portion 2c is disposed above the coil core 4 and at a position farther from the coil core 4 than each inner-winding upper wiring portion 2a. Are arranged side by side in the winding axis WA direction with the other end arranged on the outer peripheral side of the coil core 4. At this time, each outer winding upper wiring portion 2c is formed on the upper surface of the second resin layer 11b, and each outer winding upper wiring portion 2c is arranged on the same plane.

Each outer winding lower wiring portion 2d forms a plurality of pairs with each outer winding upper wiring portion 2c at a position below the coil core 4 and further from the coil core 4 than each inner winding lower wiring portion 2b. It is provided as follows. Each outer-winding lower wiring portion 2d has one end disposed on the inner peripheral side of the coil core 4 and the other end disposed on the outer peripheral side of the coil core 4 when viewed in plan, like each outer-winding upper wiring portion 2c. In this state, they are arranged side by side in the direction of the winding axis WA. At this time, each outer winding lower wiring portion 2d is formed on the lower surface of the third resin layer 11c, and each outer winding lower wiring portion 2d is arranged on the same plane.

Each outer winding inner peripheral side metal pin 3c connects one end of a pair of outer winding upper wiring portion 2c and outer winding lower wiring portion 2d which make a pair. Each outer winding inner peripheral side metal pin 3 c is formed in a columnar shape, and is arranged so that the length direction is substantially perpendicular to the upper surface of the resin layer 11. Each outer winding inner peripheral side metal pin 3c has an upper end surface connected to the outer winding upper wiring portion 2c to be connected and a lower end surface connected to the outer winding lower wiring portion 2d to be connected. In addition, each outer winding inner peripheral side metal pin 3c is arranged such that the entire end face is accommodated in the first region 5 on the inner peripheral side of the coil core 4 in plan view (see FIG. 3A).

Each outer winding outer peripheral side metal pin 3d includes the other end of one outer winding upper wiring portion 2c and the other end of the outer winding lower wiring portion 2d adjacent to the outer winding lower wiring portion 2d that forms a pair therewith. And connect. As with the other metal pins 3 a to 3 c, each outer-winding outer peripheral side metal pin 3 d is formed in a cylindrical shape, and is arranged so that the length direction is substantially perpendicular to the upper surface of the resin layer 11. Each outer winding outer peripheral side metal pin 3d has an upper end surface connected to the outer winding upper wiring portion 2c to be connected and a lower end surface connected to the outer winding lower wiring portion 2d to be connected. Moreover, each outer winding outer peripheral side metal pin 3d is arranged so that the entire end face can be accommodated in the second region 6 on the outer peripheral side of the coil core 4 in plan view (see FIG. 3A). With these configurations, the outer winding portion 7b of the inductor electrode 7 that spirally winds around the coil core 4 outside the inner winding portion 7a is formed.

Each of the metal pins 3a to 3d is formed by, for example, shearing a wire made of a metal generally used as a wiring pattern such as Cu, Al, Ag, or Ni or an alloy thereof. Can do. In this embodiment, the metal pins 3a to 3d are formed with substantially the same thickness.

In addition, each of the wiring portions 2a to 2c is formed by using, for example, a conductive paste or plating, or a double structure of a surface electrode formed by plating on a base electrode formed by a conductive paste. Can do.

Next, the arrangement of the outer winding upper wiring portion 2c and the inner winding upper wiring portion 2a will be described with reference to FIG.

As shown in FIG. 3A, the outer winding upper wiring portions 2c are arranged at substantially equal intervals along the circumferential direction of the coil core 4 (direction of the winding axis WA). Further, as shown in FIG. 3B, the inner winding upper wiring portion 2 a is also arranged at substantially equal intervals along the circumferential direction of the coil core 4. As shown in FIG. 3C, when the outer winding upper wiring portion 2c and the inner winding upper wiring portion 2a are viewed in an overlapping manner, the outer winding upper wiring portion 2c and the inner winding upper wiring portion 2a are alternately arranged, The winding upper wiring portion 2c is arranged so as not to overlap with two adjacent inner winding upper wiring portions 2a.

Similarly, the arrangement of the inner lower winding portion 2b and the outer lower winding portion 2d will be described with reference to FIG. As shown in FIGS. 4A and 4B, the

lower wiring portions

2b and 2d are also arranged at substantially equal intervals along the circumferential direction of the annular coil core 4 in the same manner as the

upper wiring portions

2c and 2a. Has been. As shown in FIG. 4 (c), when the inner winding lower wiring portion 2b and the outer winding lower wiring portion 2d are overlapped, the inner winding lower wiring portion 2b and the outer winding lower wiring portion 2d are alternately arranged. The inner winding lower wiring portions 2b are arranged so as not to overlap the two adjacent outer winding lower wiring portions 2d.

Next, the arrangement of the metal pins 3a to 3d will be described. As shown in FIG. 3, a first region 5 is set on the inner peripheral side of the coil core 4, and a second region 6 is set on the outer peripheral side. The first region 5 is an annular region having the same width as the maximum width (diameter) of the end surfaces of the inner

peripheral metal pins

3a, 3c, and the second region 6 is the maximum width of the end surfaces of the outer

peripheral metal pins

3b, 3d. An annular region having the same width as (diameter).

As shown in FIG. 3A, each outer winding inner peripheral side metal pin 3c is arranged so that one end face 31c is entirely within the first region 5, and each outer winding outer peripheral side metal pin 3d is The entire end surface 31 d is arranged so as to fit in the second region 6. Further, as shown in FIG. 3 (b), each inner winding inner metal pin 3a is arranged so that one end surface 31a is entirely within the first region 5, and each inner winding outer metal pin 3b is The one end face 31 b is disposed so as to be accommodated in the second region 6.

Further, as shown in FIG. 3C, in the first region 5, one end surface 31c of each outer winding inner peripheral side metal pin 3c and one end surface 31a of each inner winding inner peripheral side metal pin 3a are alternately arranged. In the second region 6, one end surface 31 d of each outer winding outer peripheral side metal pin 3 d and end surface 31 b of each inner winding outer peripheral side metal pin 3 b are also alternately arranged.

Similarly, as shown in FIGS. 4A and 4B, the other end surfaces 32a to 32d of the respective metal pins 3a to 3d are also arranged so that the entire end surfaces can be accommodated in the first region 5 or the second region 6, respectively. Be placed. Moreover, as shown in FIG.4 (c), in each of the 1st area | region 5 and the 2nd area | region 6, each

metal pin

3a, 3b and each

metal pin

3c, 3d are arranged alternately.

In this embodiment, the end faces 31a, 31c, 32a, 32c of the respective inner peripheral

side metal pins

3a, 3c are arranged so as to fit within the first region 5, and in the first region 5, The inner winding side metal pins 3a and the outer winding inner side metal pins 3c are alternately arranged. That is, the centers of the end faces 31a, 31c, 32a, 32c are arranged on the same circle, and the inner winding inner peripheral metal pins 3a and the outer winding inner peripheral metal pins 3c are arranged in the circumferential direction of the circle. Alternatingly arranged. Each

metal pin

3 a, 3 c does not necessarily have to be arranged on the same circle with the center of the end face, and may be arranged so that at least part of it overlaps the first region 5.

Similarly, in this embodiment, the end faces 31b, 31d, 32b, and 32d of the respective outer peripheral

side metal pins

3b and 3d are arranged so as to be accommodated in the second region 6. The winding outer peripheral side metal pins 3b and the outer winding outer peripheral side metal pins 3d are alternately arranged. That is, the centers of the end faces 31b, 31d, 32b, and 32d are arranged on the same circle, and the inner and outer peripheral metal pins 3b and the outer and outer peripheral metal pins 3d are alternately arranged in the circumferential direction of the circle. Arranged. It should be noted that the

metal pins

3 b and 3 d do not necessarily have to be arranged on the same circle with the centers of the end faces, and may be arranged so that at least a part thereof overlaps the second region 6. In this embodiment, the first region 5 and the second region 6 are set as annular regions having a predetermined width. For example, the first region 5 and the second region 6 may be circles having no width. In this case, the end faces 31a to 31d and 32a to 32d of the respective metal pins 3a to 3d are arranged so as to intersect or touch the circle.

Here, the configuration of the inductor electrode 7 will be described together with the current flow of the inductor electrode 7 with reference to FIG. A current input from 21d, which is one of the outer winding lower wiring portions 2d, flows through the input metal pin 3e connected to 21d and reaches a predetermined layer of the outer winding upper wiring portion 2c. Thereafter, an outer winding coil is formed between the outer winding upper wiring portion 2c and the outer winding lower wiring portion 2d, and the connection metal pin 3f connected to 21c, which is one of the outer winding upper wiring portions 2c, is connected. Via, the current reaches the inner winding lower wiring portion 2b. Thereafter, an inner-wound coil is formed between the inner-winding lower wiring portion 2b and the inner-winding upper wiring portion 2a. Then, 21a which is one of the inner winding upper wiring portions 2a reaches 2e which is one of the outer winding lower wiring portions 2d via the output metal pin 3g, and current is output from the coil. In this way, multiple coils of inner and outer windings with the coil core 4 as a winding axis are formed.

As shown in FIG. 3A, one end surface 31e of the input metal pin 3e and one end surface 31f of the connection metal pin 3f are respectively in the first region 5 and the second region in the outer winding upper wiring portion 2c. 6 is arranged so that at least a portion thereof overlaps, and as shown in FIG. 3B, one end face 31g of the output metal pin 3g is at least partially in the second region 6 in the inner winding upper wiring portion 2a. Arranged to overlap.

Similarly, as shown in FIG. 4A, the other end face 32f of the connection metal pin 3f is disposed so as to at least partially overlap the second region 6 in the inner winding lower wiring portion 2b. As shown in (b), the other end surface 32e of the input metal pin 3e and the other end surface 32g of the output metal pin 3g are respectively connected to the first region 5 and the second region 6 in the outer winding lower wiring portion 2d. It arrange | positions so that at least one part may overlap.

The second resin layer 11b and the third resin layer 11c of the resin layer 11 may be wiring boards. In this case, the second resin layer 11b and the third resin layer 11c are formed of glass epoxy resin or the like.

Therefore, according to the above-described embodiment, since the centers of the end faces of the outer peripheral

side metal pins

3b and 3d are arranged on the same circle, it is possible to reduce the size of the inductor component 1 and prevent the inductor electrode having a multiple winding structure. Can be realized. Further, the inner peripheral

side metal pins

3a and 3c on the inner peripheral side of the coil core 4 are difficult to manufacture because the number of the inner peripheral

side metal pins

3a and 3c that can be arranged decreases toward the inner side. By arranging them on a circle, the inner

peripheral metal pins

3a and 3c can be easily arranged even on the inner peripheral side of the coil core 4 with a small space.

Further, in plan view, the

upper wiring portions

2a and 2c are arranged so as not to overlap with each other, and the

lower wiring portions

2b and 2d are arranged so as not to overlap with each other, thereby preventing deterioration of coil characteristics due to parasitic capacitance. be able to. Although not shown, by developing the present technology, not only two windings of the inner winding part and the outer winding part but also multiple windings of three or more windings are possible.

Second Embodiment
An inductor component 1b according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 5 is a perspective view of the inductor component and shows a wiring structure. 6A is an outer winding upper wiring portion 2c, FIG. 6B is a plan view of the inner winding upper wiring portion 2a, FIG. 6C is a diagram in which the

upper wiring portions

2c and 2a are superimposed, FIG. 7A is a plan view of the outer winding lower wiring portion 2d, and FIG. 7C is a diagram in which the

lower wiring portions

2b and 2d are overlapped. .

The inductor component 1b according to this embodiment differs from the first embodiment described with reference to FIGS. 1 to 4 in that the winding axis is not circular as shown in FIGS. That is, each wiring part 2a to 2d is formed of an etching plate, and both ends of the coil core 4 of each wiring part 2a to 2d reach the periphery of the resin layer 11. Since the other configuration is the same as that of the inductor component 1a of the first embodiment, description thereof is omitted by attaching the same reference numerals.

As shown in FIG. 5, the inductor electrode 7 has a so-called multiple winding configuration including an inner winding portion 7a and an outer winding portion 7b, and is parallel to the main surface of the resin layer 11 (the upper surface or the lower surface of the resin layer 11). It winds around the winding axis WA set to (1). A coil core may be arranged on the winding axis WA.

Next, the configuration and wiring structure of the inductor electrode 7 will be described. The inner winding portion 7a of the inductor electrode 7 includes a plurality of inner winding upper wiring portions 2a (corresponding to the “first wiring portion” of the present invention) and a plurality of inner winding lower wiring portions 2b (the “second wiring” of the present invention). A plurality of inner winding left metal pins 3A (corresponding to “first metal pins” of the present invention) and a plurality of inner winding right metal pins 3B (corresponding to “second metal pins” of the present invention). ).

Each inner winding upper wiring portion 2a is disposed on the upper side of the winding axis WA (corresponding to “one side of the winding axis in the direction perpendicular to the main surface” of the present invention), and is viewed in plan view. Sometimes, one end is arranged on the left side of the winding axis WA (corresponding to “one side with respect to the winding axis” in the present invention) and the other end is on the right side of the winding axis WA (with respect to “the winding axis in the present invention”). In the state of being arranged on the other side) and arranged side by side in the direction of the winding axis WA (direction along the winding axis WA). At this time, each inner winding upper wiring portion 2a is arranged on the same plane.

Each inner winding lower wiring portion 2b is arranged below each winding axis WA (corresponding to “the other side of the winding shaft in the direction perpendicular to the main surface” of the present invention). And a plurality of pairs. At this time, each inner winding lower wiring portion 2b has one end arranged on the left side of the winding axis WA and the other end extended when viewed in plan, like each inner winding upper wiring portion 2a. In a state where it is arranged on the right side of the axis WA, it is arranged side by side in the direction of the winding axis WA. At this time, each inner winding lower wiring portion 2b is arranged on the same plane.

Each inner winding left metal pin 3A connects one end of a pair of inner winding upper wiring portion 2a and inner winding lower wiring portion 2b that make a pair. In this embodiment, each inner winding left metal pin 3 A is formed in a columnar shape, and is arranged so that the length direction is substantially perpendicular to the upper surface of the resin layer 11. In addition, the inner winding left metal pin 3A has an upper end surface connected to the inner winding upper wiring portion 2a to be connected and a lower end surface connected to the inner winding lower wiring portion 2b to be connected. Further, each inner winding left metal pin 3A is arranged so that the entire end surface thereof fits in a first region 5 described later on the left side of the winding axis WA when viewed in plan (see FIG. 6B). ).

Each inner-winding right side metal pin 3B includes the other end of one inner-winding upper wiring part 2a and the other end of the inner-winding lower-side wiring part 2b adjacent to the inner-winding lower-side wiring part 2b paired with the other end. Connect. In this embodiment, each inner-winding right metal pin 3B is formed in a columnar shape like each inner-winding left metal pin 3A, and its length direction is substantially perpendicular to the upper surface of the resin layer 11. Placed in. Each inner-winding right metal pin 3B has an upper end surface connected to the inner winding upper wiring portion 2a to be connected and a lower end surface connected to the inner winding lower wiring portion 2b to be connected. Further, each inner-winding right metal pin 3B is arranged so that the entire end surface thereof fits in a later-described second region 6 on the right side of the winding axis WA when viewed in plan (see FIG. 7A). ). With these configurations, the inner winding portion 7a of the inductor electrode 7 that spirally winds around the winding axis WA is formed.

As shown in FIG. 5, the outer winding portion 7b of the inductor electrode 7 includes a plurality of outer winding upper wiring portions 2c (corresponding to the “third wiring portion” of the present invention) and a plurality of outer winding lower wiring portions 2d ( Corresponding to the “fourth wiring portion” of the present invention, a plurality of outer wound left metal pins 3C (corresponding to “third metal pin” of the present invention), and a plurality of outer wound right metal pins 3D (corresponding to the “fourth wiring portion” of the present invention). Equivalent to a “fourth metal pin”).

Each outer winding upper wiring portion 2c is located above the winding axis WA, and is disposed at a position farther from the winding axis WA than each inner winding upper wiring portion 2a. The one end is arranged on the left side of the winding axis WA, and the other end is arranged on the right side of the winding axis WA, and is arranged side by side in the direction of the winding axis WA. At this time, each outer winding upper wiring portion 2c is arranged on the same plane.

Each outer-winding lower wiring portion 2d is below the winding axis WA, and at a position farther from the winding axis WA than each inner-winding lower wiring portion 2b, a plurality of outer-winding upper wiring portions 2c. It is provided to make a pair. Each of the outer winding lower wiring portions 2d has one end arranged on the left side of the winding axis WA and the other end on the right side of the winding axis WA when viewed in plan, like each outer winding upper wiring portion 2c. Are arranged side by side in the direction of the winding axis WA. At this time, each outer winding lower wiring portion 2d is disposed on the same plane.

Each outer winding left metal pin 3C connects one end of a pair of outer winding upper wiring portion 2c and outer winding lower wiring portion 2d that make a pair. Each outer-winding left-side metal pin 3 C is formed in a cylindrical shape, and is arranged so that the length direction is substantially perpendicular to the upper surface of the resin layer 11. Each outer winding left metal pin 3C has an upper end surface connected to each outer winding upper wiring portion 2c to be connected and a lower end surface connected to the outer winding lower wiring portion 2d to be connected. Each of the outer-winding left-side metal pins 3C is arranged so that the entire end face can be accommodated in the first region 5 on the left side of the winding axis WA when viewed in plan (see FIG. 6A).

Each outer-winding right metal pin 3D includes the other end of one outer-winding upper wiring portion 2c and the other end of the outer-winding lower-wiring portion 2d adjacent to the outer-winding lower-wiring portion 2d that is paired with the other end. Connect. Each outer-winding right-side metal pin 3D is formed in a cylindrical shape like the other metal pins 3A to 3C, and is arranged so that the length direction is substantially perpendicular to the upper surface of the resin layer 11. Each outer winding right metal pin 3D has an upper end surface connected to the outer winding upper wiring portion 2c to be connected and a lower end surface connected to the outer winding lower wiring portion 2d to be connected. Further, each outer-winding right-side metal pin 3D is arranged so that the entire end face can be accommodated in the second region 6 on the right side of the winding axis WA when viewed in plan (see FIG. 7B). With these configurations, the outer winding portion 7b of the inductor electrode 7 that spirally winds around the winding axis WA is formed outside the inner winding portion 7a.

Further, as shown in FIGS. 6 and 7, each of the wiring portions 2a to 2d can be formed by etching a single metal plate (rectangular shape in plan view) formed of Cu or the like, for example. it can. In the case of the first etching plate 8c (see FIG. 6A) in which each outer winding upper wiring portion 2c is formed, only the region of the frame 9c and each outer winding upper wiring portion 2c is left, and the other portions are removed by etching. Then, the first etching plate 8c is formed in a state where both end portions of each outer winding upper wiring portion 2c are supported by the frame 9c. Similarly, as shown in FIGS. 6B, 7A, and 7B, the second etching plate 8a, the third etching plate 8b, and the fourth etching plate 7d can be formed.

After the etching plates 8a to 8d and the metal pins 3A to 3D are connected to form the inductor electrode 7, for example, an epoxy resin is filled to form a resin layer, and then the frames 9a to 9a of the etching plates 8a to 8d are formed. By removing 9d by dicing or the like, it is possible to form the inductor component 1b in which both end portions of the wiring portions 2a to 2d reach the periphery of the resin layer 11. The connection between the metal plate and the metal pin can be performed using a bonding material such as solder bonding, ultrasonic bonding, or conductive adhesive.

As shown in FIG. 6 (a), the outer winding upper wiring portions 2c are arranged at substantially equal intervals along the winding axis WA direction. Moreover, as shown in FIG.6 (b), each inner winding upper side wiring part 2a is also arranged at substantially equal intervals along the winding axis WA direction. In addition, as shown in FIG. 6C, when each outer winding upper wiring portion 2c and each inner winding upper wiring portion 2a are viewed in an overlapping manner, the outer winding upper wiring portion 2c and the inner winding upper wiring portion 2a are alternately arranged. The outer winding upper wiring portion 2c is arranged so as not to overlap the adjacent inner winding upper wiring portion 2a.

Similarly, the arrangement of the inner lower winding portion 2b and the outer lower winding portion 2d will be described with reference to FIG. As shown in FIGS. 7A and 7B, the

lower wiring portions

2b and 2d are also arranged at substantially equal intervals along the winding axis WA in the same manner as the

upper wiring portions

2c and 2a. . In this embodiment, as shown in FIG. 7 (c), when each inner winding lower wiring portion 2b and each outer winding lower wiring portion 2d are viewed in an overlapping manner, each inner winding lower wiring portion 2b Each outer winding lower wiring portion 2d has an overlapping portion.

Next, the arrangement of the metal pins 3A to 3D will be described. As shown in FIG. 6, the first area 5 is set on the left side of the winding axis WA, and the second area 6 is set on the right side. The first region 5 is a strip-shaped region having the same width as the maximum width (diameter) of the end face of each

left metal pin

3A, 3C and extending in a direction parallel to the winding axis WA, and the second region 6 is each right side This is a band-like region having the same width as the maximum width (diameter) of the end faces of the metal pins 3B and 3D and extending in a direction parallel to the winding axis WA.

As shown in FIG. 6A, each outer-winding left-side metal pin 3C is arranged so that one end surface 31C as a whole fits in the first region 5, and each outer-winding right-side metal pin 3D has one end surface 31D. Are arranged so as to fit in the second region 6. Further, as shown in FIG. 3B, each inner winding left metal pin 3A is arranged so that one end face 31A entirely fits in the first region 5, and each inner winding right metal pin 3B The entire end surface 31 B is disposed in the second region 6.

Further, as shown in FIG. 6C, in the first region 5, one end surface 31C of each outer winding left metal pin 3C and one end surface 31A of each inner winding left metal pin 3A are alternately arranged, In the second region 6, one end surface 31d of each outer-winding right metal pin 3D and one end surface 31B of each inner-winding right metal pin 3B are alternately arranged.

Similarly, as shown in FIGS. 7A and 7B, the other end faces 32A to 32D of the respective metal pins 3A to 3D are also arranged so that the whole end face can be accommodated in the first region 5 or the second region 6, respectively. Be placed.

In this embodiment, the entire end surfaces 31A, 31C, 32A, 32C of the

left metal pins

3A, 3C are arranged so as to be accommodated in the first region 5. The metal pins 3A and the outer winding left metal pins 3C are alternately arranged. That is, the centers of the end faces 31A, 31C, 32A, 32C are arranged on a straight line, and the inner winding left metal pins 3A and the outer winding left metal pins 3C are alternately arranged in the direction of the winding axis WA of the straight lines. Arranged. The metal pins 3A, 3C do not necessarily have to be arranged in a straight line at the center of the end face, and are arranged so that at least a part thereof overlaps the first region 5 or the end faces of the metal pins 3A-3D. What is necessary is just to arrange | position so that 31A-31D and 32A-32D may cross | intersect or touch the said straight line.

Similarly, in this embodiment, the entire end faces 31B, 31D, 32B, 32D of the

right metal pins

3B, 3D are arranged so as to be accommodated in the second region 6. The right metal pins 3B and the outer winding right metal pins 3D are alternately arranged. That is, the centers of the end faces 31B, 31D, 32B, and 32D are arranged on a straight line, and the inner winding right metal pins 3B and the outer winding right metal pins 3D are alternately arranged in the direction of the winding axis WA of the straight lines. Arranged. The metal pins 3 B and 3 D do not necessarily have to be arranged on the straight line at the center of the end face, and may be arranged so that at least a part thereof overlaps the second region 6.

In this embodiment, the first region 5 and the second region 6 are set as band-like regions having a predetermined width. For example, the first region 5 and the second region 6 are straight lines having no width. In this case, the end faces 31A to 31D and 32A to 32D of the metal pins 3A to 3D are arranged so as to intersect or be in contact with the straight line.

Here, with reference to FIG. 5, it will be described together with the current flow of the inductor electrode 7 of the inductor electrode 7. The current input from the lower end of the input metal pin 3e reaches the outer winding upper wiring portion 2c, and forms an outer winding coil between the outer winding upper wiring portion 2c and the outer winding lower wiring portion 2d. Thereafter, the current reaches the inner winding lower wiring portion 2b via the connection metal pin 3f. Thereafter, an inner-wound coil is formed between the inner-winding lower wiring portion 2b and the inner-winding upper wiring portion 2a. And an electric current is output from the output metal pin 3g connected with one of the inner volume upper side wiring parts 2a. In this way, multiple coils of inner and outer windings are formed.

In addition, since each inner winding lower wiring portion 2b and each outer winding lower wiring portion 2d have overlapping portions, there is a possibility that parasitic capacitance may be generated, but each inner winding lower wiring portion 2b and each outer winding. By increasing the distance from the lower wiring portion 2d, the parasitic capacitance can be reduced.

Therefore, according to the above-described embodiment, since the centers of the end faces of the right metal pins 3B and 3D are arranged so as to be accommodated in the first region 5 and the second region 6, it is possible to prevent the inductor component 1b from being enlarged. Thus, an inductor electrode having a multiple winding structure can be realized.

Further, since the

upper wiring portions

2a and 2c are arranged so as not to overlap each other in plan view, it is possible to prevent deterioration of coil characteristics due to parasitic capacitance. Further, since each of the wiring portions 2a to 2d is formed of a lead frame, the resistance value of the inductor electrode 7 can be lowered and the inductor characteristics can be improved. Since the outer end of the coil core of each wiring part is formed so as to reach the periphery of the resin layer, the metal part of the inductor component is increased, and the heat dissipation of the inductor component can be improved. In addition, a part of each wiring portion is exposed from the resin layer, and heat accumulated in the resin layer is easily released. Furthermore, since the coil is formed of a metal plate, it is possible to easily realize the coil formation of two or more turns.

The present invention is not limited to the above-described embodiments, and various modifications other than those described above can be made without departing from the spirit of the present invention. Any combination may be used. For example, in each of the above-described embodiments, the case where each of the metal pins 3a to 3d, 3A to 3D, and 3e to 3g is cylindrical has been described. For example, a corner having a rectangular cross-sectional shape in a direction perpendicular to the length direction. You may form in a column shape.

The present invention can be widely applied to various inductor components in which the inductor electrode has a metal pin and a wiring portion.

1a, 1b Inductor component 2a Inner winding upper wiring part (first wiring part)
2b Inner winding lower wiring part (second wiring part)
2c Outer winding upper wiring part (third wiring part)
2d Outer winding lower wiring part (fourth wiring part)
3a Inner volume inner circumference side metal pin (first metal pin)
3A Inner volume left metal pin (first metal pin)
3b Inner volume outer peripheral side metal pin (second metal pin)
3B Inner volume right metal pin (second metal pin)
3c Outer winding inner peripheral metal pin (third metal pin)
3C Outer winding left metal pin (third metal pin)
3d Outer winding outer metal pin (fourth metal pin)
3D Outer winding right metal pin (4th metal pin)
4 Coil core 5 1st area 6 2nd area 7 Inductor electrode WA Winding axis

Claims

A resin layer having a main surface;
An inductor electrode wound around a winding axis set inside the resin layer;
The inductor electrode has an inner winding portion and an outer winding portion,
The inner winding part
When viewed from a direction perpendicular to the main surface, one end is disposed on one side with respect to the winding shaft and the other end is disposed on the other side with respect to the winding shaft, A first wiring portion for a plurality of wirings arranged side by side in the winding axis direction on one side of the winding axis in a direction perpendicular to the winding axis;
When viewed from a direction perpendicular to the main surface, one end is disposed on the one side with respect to the winding shaft and the other end is disposed on the other side with respect to the winding shaft, A plurality of wiring lines arranged side by side in the winding axis direction on the other side of the winding axis in a direction perpendicular to the main surface so as to form a plurality of pairs with each of the first wiring portions. A second wiring portion;
A plurality of first metal pins connecting the one end of each of the first wiring portions and the one end of the second wiring portion paired with the first wiring portion;
A plurality of second metal pins that connect the other end of each of the first wiring portions and the other end of the second wiring portion adjacent to the second wiring portion that forms a pair with the first wiring portion. Have
The outer winding part is
When viewed from a direction perpendicular to the main surface, one end is disposed on the one side with respect to the winding shaft and the other end is disposed on the other side with respect to the winding shaft, A plurality arranged side by side in the direction of the winding axis on the one side of the winding axis in a direction perpendicular to the main surface and at a position farther from the winding axis than the first wiring portions. A third wiring portion for wiring,
When viewed from a direction perpendicular to the main surface, one end is disposed on the one side with respect to the winding shaft and the other end is disposed on the other side with respect to the winding shaft, Each other side of the winding axis in a direction perpendicular to the main surface and apart from the winding axis than each second metal plate so as to form a plurality of pairs with each third wiring portion. A plurality of wiring fourth wiring parts arranged side by side in the winding axis direction,
A plurality of third metal pins that connect the one end of each of the third wiring portions and the one end of the fourth wiring portion that forms a pair with the third wiring portion;
A plurality of fourth metal pins that connect the other end of each of the third wiring portions and the other end of the fourth wiring portion adjacent to the fourth wiring portion that forms a pair with the third wiring portion. Have
The first metal pin and the third metal pin are regions set on the one side of the winding shaft when viewed from a direction perpendicular to the main surface, and are wound with a predetermined width. The first region extending in a direction parallel to the rotation axis is arranged so as to at least partially overlap,
The predetermined width of the first region is a maximum width of a cross section of one metal pin of the first metal pins and the third metal pins,
The second metal pin and the fourth metal pin are regions set on the other side of the winding shaft when viewed from a direction perpendicular to the main surface, and are wound with a predetermined width. Arranged in a second region extending in a direction parallel to the rotation axis so as to at least partially overlap,
The predetermined width of the second region is a maximum width of a cross section of one of the second metal pins and the fourth metal pins,
The first wiring portions and the third wiring portions are alternately arranged in the direction of the winding axis so as not to overlap each other when viewed from a direction perpendicular to the main surface. Inductor parts characterized by
The winding axis is circular when viewed from a direction perpendicular to the main surface,
The inductor component according to claim 1, wherein an annular coil core is disposed on the winding shaft.
The second wiring portions and the fourth wiring portions are alternately arranged in the direction of the winding axis so as not to overlap each other when viewed from a direction perpendicular to the main surface. The inductor component according to claim 2.
Each of the first wiring portions, the second wiring portions, the third wiring portions, and the fourth wiring portions has at least one end when viewed from a direction perpendicular to the main surface. The inductor component according to claim 1, wherein the inductor component is formed so as to reach a peripheral edge of the resin layer.
5. Each of the first wiring parts, the second wiring parts, the third wiring parts, and the fourth wiring parts is formed of a metal plate. The inductor component according to any one of the above.
5. Each of the first wiring parts, the second wiring parts, the third wiring parts, and the fourth wiring parts are formed by plating. Inductor component according to the above.
The inductor component according to any one of claims 1 to 6, wherein the inductor electrode has a multiple winding structure of two or more turns.
When each of the second wiring portions and each of the fourth wiring portions has an overlapping portion, the distance between each of the second wiring portions and each of the fourth wiring portions is the distance between each of the first wiring portions and each of the fourth wiring portions. The inductor component according to claim 1, wherein the inductor component is larger than a distance from the three wiring portions.