WO2022196263A1 - コイル部品 - Google Patents
コイル部品 Download PDFInfo
- Publication number
- WO2022196263A1 WO2022196263A1 PCT/JP2022/007195 JP2022007195W WO2022196263A1 WO 2022196263 A1 WO2022196263 A1 WO 2022196263A1 JP 2022007195 W JP2022007195 W JP 2022007195W WO 2022196263 A1 WO2022196263 A1 WO 2022196263A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- coil
- region
- coil component
- mounting surface
- regions
- Prior art date
Links
- 239000004020 conductor Substances 0.000 claims abstract description 66
- 239000010410 layer Substances 0.000 claims description 58
- 239000011229 interlayer Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims description 4
- 229910000679 solder Inorganic materials 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 239000006247 magnetic powder Substances 0.000 description 4
- 239000002243 precursor Substances 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 238000013459 approach Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 239000000696 magnetic material Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000889 permalloy Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F17/0013—Printed inductances with stacked layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/04—Fixed inductances of the signal type with magnetic core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
- H01F27/292—Surface mounted devices
Definitions
- the present invention relates to a coil component, and more particularly, to a coil component having a structure in which a coil portion formed by alternately laminating a plurality of conductor layers and a plurality of interlayer insulating layers is embedded in a magnetic member.
- a coil component described in Patent Document 1 is known as a coil component having a structure in which a coil portion in which a plurality of conductor layers and a plurality of interlayer insulating layers are alternately laminated is embedded in a magnetic member.
- electrode patterns exposed from the magnetic member are covered with terminal electrodes.
- the planar shape of the terminal electrodes is determined by the planar shape of the electrode pattern exposed from the magnetic member, and it has not been possible to make any planar shape.
- the planar shape of the terminal electrodes can be set arbitrarily. aim.
- a coil component according to the present invention includes a magnetic member, a coil portion embedded in the magnetic member and having a plurality of conductor layers and a plurality of interlayer insulating layers alternately laminated in a first direction, and terminal electrodes made of a conductive paste.
- Each of the plurality of conductor layers has a coil conductor pattern embedded in the magnetic member and an electrode pattern exposed from the mounting surface parallel to the first direction, and the terminal electrode is an electrode on the mounting surface It has a first region provided at a position covering the pattern, and second and third regions provided at a region not covering the electrode pattern on the mounting surface, and the first region extends in the first direction. to second and third regions, the first region having a width in a second direction perpendicular to the first direction that is wider than the second and third regions, whereby the first region constitutes a first protrusion projecting in the second direction.
- the planar shape of the terminal electrodes can be arbitrary. Moreover, in the present invention, since the terminal electrode has the first projecting portion in a plan view, this makes it difficult for the mounting position to shift in the first direction during mounting.
- the first protrusion may protrude toward the side surface of the magnetic member perpendicular to the second direction. According to this, it is possible to suppress the spread of the solder fillet formed on the side surface of the magnetic member during mounting. In this case, the thickness of the first projecting portion may become thinner as it approaches the side surface. According to this, it is possible to further suppress the spread of the solder fillet.
- another part of the first region may constitute a second protrusion that protrudes in a direction opposite to the first protrusion. This makes it more difficult for the mounting position to shift in the first direction during mounting.
- the thickness of the central portion of the first region may be locally thinner than that of the second and third regions, so that the terminal electrode may be partially recessed. According to this, since excess solder is accommodated in the depression of the terminal electrode, it is possible to further suppress the spread of the solder fillet.
- the planar shape of the terminal electrodes can be arbitrarily set. It becomes possible to
- FIG. 1 is a perspective view showing the appearance of a coil component 10A according to the first embodiment of the invention.
- FIG. 2 is a cross-sectional view of the coil component 10A.
- FIG. 3 is a yz side view of the coil component 10A.
- FIG. 4 is a yz side view of the coil component 10A.
- FIG. 5 is an xy plan view of the coil component 10A.
- FIG. 6 is a schematic diagram for explaining the planar shape of the terminal electrode 71 on the mounting surface S1 of the coil component 10A.
- FIG. 7 is a perspective view showing the appearance of the precursor 10 of the coil components 10A, 10B.
- FIG. 8 is a top view for explaining ranges W1 and W2 where the conductive paste is applied.
- FIG. 9 is a schematic top view showing the state immediately after applying the conductive paste.
- FIG. 10 is a perspective view showing the appearance of a coil component 10B according to the second embodiment of the invention.
- FIG. 11 is a schematic diagram for explaining the planar shape of the terminal electrode 71 on the mounting surface S1 of the coil component 10B.
- FIG. 12 is an xy plan view of the coil component 10B.
- FIG. 13 is a schematic top view showing the state immediately after applying the conductive paste.
- FIG. 1 is a perspective view showing the appearance of a coil component 10A according to the first embodiment of the invention.
- a coil component 10A according to the first embodiment is a surface-mounted chip component, and includes magnetic members 11 and 12 and a coil portion 20 embedded in the magnetic members 11 and 12, as shown in FIG. Although the configuration of the coil section 20 will be described later, in this embodiment, four conductor layers having coil conductor patterns are laminated to form one coil in series. One end of the coil is connected to the terminal electrode 71 and the other end of the coil is connected to the terminal electrode 72 .
- the terminal electrodes 71 and 72 are made of a conductive paste such as nano-silver paste or nano-copper paste, and their surfaces are covered with a laminated film of nickel (Ni) and tin (Sn) to ensure wettability with solder.
- the magnetic members 11 and 12 are composite members made of resin containing magnetic powder such as ferrite powder and metal magnetic powder, and constitute a magnetic path for magnetic flux generated by applying current to the coil portion 20 .
- metallic magnetic powder is used as the magnetic powder
- the resin it is preferable to use a liquid or powder epoxy resin.
- FIG. 2 is a cross-sectional view of the coil component 10A according to this embodiment.
- a coil portion 20 included in the coil component 10A is sandwiched between two magnetic members 11 and 12, and interlayer insulating layers 40 to 44 and conductor layers 31 to 34 are alternately laminated in the z direction. It has a configured configuration.
- the conductor layers 31-34 are connected to each other via through-holes formed in the interlayer insulating layers 41-43 to form one series coil.
- a magnetic member 13 made of the same material as the magnetic member 12 is embedded in the inner diameter portion of the coil.
- the interlayer insulating layers 40 to 44 are made of resin, for example, and at least the interlayer insulating layers 41 to 43 are made of a non-magnetic material.
- a magnetic material may be used for the interlayer insulating layer 40 positioned at the lowest layer and the interlayer insulating layer 44 positioned at the uppermost layer.
- the conductor layer 31 is the first conductor layer formed on the upper surface of the magnetic member 11 with the interlayer insulation layer 40 interposed therebetween.
- the conductor layer 31 is provided with a coil conductor pattern C1 wound in two spiral turns and two electrode patterns 51 and 61 .
- the electrode pattern 51 is connected to one end of the coil conductor pattern C1, while the electrode pattern 61 is provided independently of the coil conductor pattern C1.
- the coil conductor pattern C ⁇ b>1 is embedded in the coil portion 20 and portions of the electrode patterns 51 and 61 are exposed from the coil portion 20 .
- the conductor layer 32 is a second conductor layer formed on the upper surface of the conductor layer 31 with an interlayer insulating layer 41 interposed therebetween.
- the conductor layer 32 is provided with a coil conductor pattern C2 wound in two spiral turns and two electrode patterns 52 and 62 . Both the electrode patterns 52 and 62 are provided independently of the coil conductor pattern C2.
- the coil conductor pattern C ⁇ b>2 is embedded in the coil portion 20 and portions of the electrode patterns 52 and 62 are exposed from the coil portion 20 .
- the conductor layer 33 is a third conductor layer formed on the upper surface of the conductor layer 32 with an interlayer insulating layer 42 interposed therebetween.
- the conductor layer 33 is provided with a coil conductor pattern C3 wound in two spiral turns and two electrode patterns 53 and 63 . Both the electrode patterns 53 and 63 are provided independently of the coil conductor pattern C3.
- the coil conductor pattern C3 is embedded in the coil portion 20, and part of the electrode patterns 53 and 63 are exposed from the coil portion 20. As shown in FIG.
- the conductor layer 34 is a fourth conductor layer formed on the upper surface of the conductor layer 33 with an interlayer insulating layer 43 interposed therebetween.
- the conductor layer 34 is provided with a coil conductor pattern C4 wound in two spiral turns and two electrode patterns 54 and 64 .
- the electrode pattern 64 is connected to one end of the coil conductor pattern C4, while the electrode pattern 54 is provided independently of the coil conductor pattern C4.
- the coil conductor pattern C4 is embedded in the coil portion 20, and portions of the electrode patterns 54 and 64 are exposed from the coil portion 20. As shown in FIG.
- Coil conductor pattern C1 and coil conductor pattern C2 are connected via via conductors provided through interlayer insulating layer 41, and coil conductor pattern C2 and coil conductor pattern C3 are connected through interlayer insulating layer 42.
- the coil conductor pattern C3 and the coil conductor pattern C4 are connected through via conductors provided through the interlayer insulating layer 43 .
- an 8-turn coil is formed by the coil conductor patterns C1 to C4, one end of which is connected to the terminal electrode 71 and the other end of which is connected to the terminal electrode 72.
- electrode patterns 51-54 are connected to each other through via conductors V1-V3 provided through the interlayer insulating layers 41-43.
- electrode patterns 61-64 are connected to each other through via conductors V4-V6 provided through interlayer insulating layers 41-43.
- the formation positions of the via conductors V1 to V3 seen from the stacking direction are different from each other, and the formation positions of the via conductors V4 to V6 from the stacking direction are also different from each other.
- the coil component 10A is mounted upright so that the z direction, which is the lamination direction, is parallel to the circuit board. Specifically, the surface forming the xz plane is used as the mounting surface S1. Terminal electrodes 71 and 72 are provided on the mounting surface S1.
- FIG. 3 and 4 are yz side views of the coil component 10A
- FIG. 5 is an xy plan view of the coil component 10A.
- part of the electrode patterns 51 to 54 and part of the interlayer insulating layers 40 to 44 are exposed on the side surface S2 forming one yz plane.
- the electrode patterns 61 to 64 and the interlayer insulating layers 40 to 44 are partially exposed on the side surface S3 forming the other yz plane.
- the electrode patterns 51 to 54 and 61 to 64 are not exposed on the side surface S4 forming one xy plane.
- Portions of the terminal electrodes 71 and 72 are formed on the side surfaces S4 and S5. The terminal electrode 71 is in contact with the electrode patterns 51 to 54 exposed on the mounting surface S1, and the terminal electrode 72 is in contact with the electrode patterns 61 to 64 exposed on the mounting surface S1.
- FIG. 6 is a schematic diagram for explaining the planar shape of the terminal electrode 71 on the mounting surface S1. Although not shown, the same applies to the planar shape of the terminal electrode 72 on the mounting surface S1.
- the hatched areas in FIG. 6 are areas where the electrode patterns 51 to 54 are exposed.
- the terminal electrodes 71 are provided in a first region A1 provided on the mounting surface S1 at a position covering the electrode patterns 51 to 54, and a first region A1 provided on a region not covering the electrode patterns 51 to 54 on the mounting surface S1. 2 and a third area A2, A3.
- the area A1 is sandwiched between the areas A2 and A3 in the z direction.
- the position and planar shape of the region A1 substantially match the positions and planar shapes of the regions where the electrode patterns 51 to 54 are exposed.
- the width in the x direction and the width in the z direction of the exposed area of 54 are substantially the same.
- the widths of the regions A2 and A3 in the x direction are narrower than the width of the region A1 in the x direction, so that part of the region A1 constitutes a protruding portion A11 that protrudes in the x direction.
- the portion of the area A1 whose position in the x direction coincides with the areas A2 and A3 is defined as the body portion A10, the area A1 is composed of the body portion A10 and the projecting portion A11.
- the terminal electrode 71 thus has the projecting portion A11 projecting in the x-direction, areas A4 and A5 where the terminal electrode 71 is not provided are formed on the mounting surface S1.
- the widths of the regions A4 and A5 in the x direction are substantially the same as the width of the protrusion A11 in the x direction, and the widths of the regions A4 and A5 in the z direction are substantially the same as the widths of the regions A2 and A3 in the z direction.
- the terminal electrodes 71 and 72 have the planar shape described above on the mounting surface S1, and the areas A4 and A5 where the terminal electrodes 71 are not provided exist on both sides of the projecting portion A11 in the z direction.
- the regions A4 and A5 are insulating regions and do not have wettability to solder, so that the projecting portion A11 is positioned at the center of the land pattern in the z direction, and the regions A4 and A5 prevent displacement in the z direction. This is because that.
- the thickness in the y direction of the projecting portion A11 becomes thinner as it approaches the side surface S2.
- the spread of the solder fillet formed on the side surface S2 is suppressed, so that high-density mounting can be achieved.
- the central portion of the region A1 is locally thinner than the regions A2 and A3, and the terminal electrodes 71 and 72 are partially formed with depressions 71a and 72a. As a result, excess solder is accommodated in the depressions 71a and 72a during mounting, so that the spread of the solder fillet can be further suppressed.
- the coil portion 20 is formed by alternately laminating the interlayer insulating layers 40 to 44 and the conductor layers 31 to 34 in the z-direction, and then the coil portion 20 is embedded in the magnetic members 11 to 13, thereby forming the coil shown in FIG.
- a precursor 10 of the coil component 10A is produced.
- a conductive paste is applied to the area W1 shown in FIGS.
- As a method of applying the conductive paste there is a method of rotating a roller filled with the conductive paste in a groove having a width corresponding to the range W1, thereby transferring the conductive paste to the mounting surface S1.
- the range W1 is a range of the electrode patterns 51 to 54 and 61 to 64 exposed on the mounting surface S1, excluding the portions near the side surfaces S2 and S3.
- FIG. 9 which is a schematic plan view
- main body portions A10 and areas A2 and A3 of the terminal electrodes 71 and 72 are formed on the mounting surface S1.
- the portions of the electrode patterns 51 to 54 and 61 to 64 near the side surfaces S2 and S3 are exposed.
- the conductive paste flows to the exposed portions of the electrode patterns 51 to 54 and 61 to 64, forming the projecting portions A11 shown in FIG.
- the protruding portion A11 By forming the protruding portion A11 by flowing the conductive paste in this way, it is possible to obtain a shape in which the thickness becomes thinner as it approaches the side surfaces S2 and S3, as described using FIG. In addition, since the volume of the conductive paste applied to the main body A10 decreases due to the flow, depressions 71a and 72a are formed in the main body A10.
- FIG. 10 is a perspective view showing the appearance of a coil component 10B according to the second embodiment of the invention.
- a coil component 10B according to the second embodiment differs from the coil component 10A according to the first embodiment in the planar shape of terminal electrodes 71 and 72 on the mounting surface S1. Since other basic configurations are the same as those of the coil component 10A according to the first embodiment, the same elements are denoted by the same reference numerals, and overlapping descriptions are omitted.
- FIG. 11 is a schematic diagram for explaining the planar shape of the terminal electrode 71 on the mounting surface S1 of the coil component 10B according to the second embodiment. Although not shown, the same applies to the planar shape of the terminal electrode 72 on the mounting surface S1.
- hatched areas are areas where the electrode patterns 51 to 54 are exposed, and the terminal electrode 71 is provided on the mounting surface S1 at a position covering the electrode patterns 51 to 54 in a first area A1. , and second and third regions A2 and A3 provided in regions not covering the electrode patterns 51 to 54 on the mounting surface S1.
- the area A1 is sandwiched between the areas A2 and A3 in the z direction.
- the position and planar shape of the region A1 substantially match the positions and planar shapes of the regions where the electrode patterns 51 to 54 are exposed.
- the width in the x direction and the width in the z direction of the exposed area of 54 are substantially the same.
- the width of the regions A2 and A3 in the x direction is narrower than the width of the region A1 in the x direction, so that part of the region A1 constitutes protrusions A11 and A12 that protrude in the x direction.
- the protrusions A11 and A12 protrude in directions opposite to each other, and the main body A10 is sandwiched between the protrusions A11 and A12 in the x direction.
- the edges of the protrusions A11 and A12 in the z-direction may cause deviation of the coil component 10B in the z-direction during mounting. It functions as a stopper to prevent
- FIG. 12 which is an xy plan view of the coil component 10B
- the thickness in the y direction of the protruding portions A11 and A12 decreases with increasing distance from the main body portion A10. This makes it easier to supply the underfill between the terminal electrodes 71 and 72 during mounting.
- the range W2 is a region of the electrode patterns 51 to 54 and 61 to 64 exposed on the mounting surface S1, excluding both end portions in the x direction.
- FIG. 13 which is a schematic plan view
- main body portions A10 and areas A2 and A3 of the terminal electrodes 71 and 72 are formed on the mounting surface S1.
- both ends of the electrode patterns 51 to 54 and 61 to 64 in the x direction are exposed.
- the conductive paste flows to the exposed portions of the electrode patterns 51 to 54 and 61 to 64, forming the protrusions A11 and A12 shown in FIG.
- the coil section 20 includes four conductor layers 31 to 34 has been described as an example, but the number of conductor layers in the present invention is not limited to this. Also, the number of turns of the coil conductor pattern formed on each conductor layer is not particularly limited.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
図1は、本発明の第1の実施形態によるコイル部品10Aの外観を示す斜視図である。
図10は、本発明の第2の実施形態によるコイル部品10Bの外観を示す斜視図である。
10A,10B コイル部品
11~13 磁性部材
20 コイル部
31~34 導体層
40~44 層間絶縁層
51~54,61~64 電極パターン
71,72 端子電極
71a,72a 窪み
81~83 エッジ
A1 第1の領域
A10 本体部
A11,A12 突出部
A2 第2の領域
A3 第3の領域
A4 第4の領域
A5 第5の領域
C1~C4 コイル導体パターン
S1 実装面
S2~S5 側面
V1~V6 ビア導体
W1,W2 導電性ペーストの塗布範囲
Claims (5)
- 磁性部材と、
前記磁性部材に埋め込まれ、複数の導体層と複数の層間絶縁層が第1の方向に交互に積層されたコイル部と、
導電性ペーストからなる端子電極と、を備え、
前記複数の導体層のそれぞれは、前記磁性部材に埋め込まれたコイル導体パターンと、前記第1の方向と平行な実装面から露出する電極パターンとを有し、
前記端子電極は、前記実装面上において前記電極パターンを覆う位置に設けられた第1の領域と、前記実装面上において前記電極パターンを覆わない領域に設けられた第2及び第3の領域とを有し、
前記第1の領域は、前記第1の方向から前記第2及び第3の領域に挟まれ、
前記第1の領域は、前記第1の方向と直交する第2の方向における幅が前記第2及び第3の領域よりも広く、これにより、前記第1の領域の一部は、前記第2の方向に突出した第1の突出部を構成することを特徴とするコイル部品。 - 前記第1の突出部は、前記第2の方向に対して垂直な前記磁性部材の側面に向かって突出していることを特徴とする請求項1に記載のコイル部品。
- 前記第1の突出部は、前記側面に近づくに連れて厚みが薄くなることを特徴とする請求項2に記載のコイル部品。
- 前記第1の領域の別の一部は、前記第1の突出部とは逆方向に突出した第2の突出部を構成することを特徴とする請求項1乃至3のいずれか一項に記載のコイル部品。
- 前記第1の領域の中央部は前記第2及び第3の領域よりも局所的に厚みが薄く、これにより端子電極の一部が窪んでいることを特徴とする請求項1乃至4のいずれか一項に記載のコイル部品。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US18/549,264 US20240170202A1 (en) | 2021-03-19 | 2022-02-22 | Coil component |
CN202280022547.4A CN116997981A (zh) | 2021-03-19 | 2022-02-22 | 线圈部件 |
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JP2021-046031 | 2021-03-19 | ||
JP2021046031A JP2022144846A (ja) | 2021-03-19 | 2021-03-19 | コイル部品 |
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WO2022196263A1 true WO2022196263A1 (ja) | 2022-09-22 |
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PCT/JP2022/007195 WO2022196263A1 (ja) | 2021-03-19 | 2022-02-22 | コイル部品 |
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US (1) | US20240170202A1 (ja) |
JP (1) | JP2022144846A (ja) |
CN (1) | CN116997981A (ja) |
WO (1) | WO2022196263A1 (ja) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2019036589A (ja) * | 2017-08-10 | 2019-03-07 | 株式会社村田製作所 | インダクタ部品 |
JP2022055132A (ja) * | 2020-09-28 | 2022-04-07 | Tdk株式会社 | コイル部品及びその製造方法 |
-
2021
- 2021-03-19 JP JP2021046031A patent/JP2022144846A/ja active Pending
-
2022
- 2022-02-22 US US18/549,264 patent/US20240170202A1/en active Pending
- 2022-02-22 WO PCT/JP2022/007195 patent/WO2022196263A1/ja active Application Filing
- 2022-02-22 CN CN202280022547.4A patent/CN116997981A/zh active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2019036589A (ja) * | 2017-08-10 | 2019-03-07 | 株式会社村田製作所 | インダクタ部品 |
JP2022055132A (ja) * | 2020-09-28 | 2022-04-07 | Tdk株式会社 | コイル部品及びその製造方法 |
Also Published As
Publication number | Publication date |
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CN116997981A (zh) | 2023-11-03 |
US20240170202A1 (en) | 2024-05-23 |
JP2022144846A (ja) | 2022-10-03 |
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