WO2013038752A1 - インダクタ素子およびその製造方法 - Google Patents
インダクタ素子およびその製造方法 Download PDFInfo
- Publication number
- WO2013038752A1 WO2013038752A1 PCT/JP2012/062901 JP2012062901W WO2013038752A1 WO 2013038752 A1 WO2013038752 A1 WO 2013038752A1 JP 2012062901 W JP2012062901 W JP 2012062901W WO 2013038752 A1 WO2013038752 A1 WO 2013038752A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- ferrite layer
- ceramic green
- green sheet
- inductor element
- thermal expansion
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 239000004020 conductor Substances 0.000 claims abstract description 43
- 238000010304 firing Methods 0.000 claims abstract description 12
- 229910052709 silver Inorganic materials 0.000 claims abstract description 8
- 239000004332 silver Substances 0.000 claims abstract description 8
- 239000000919 ceramic Substances 0.000 claims description 50
- 239000000463 material Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 7
- 239000000696 magnetic material Substances 0.000 claims description 6
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 68
- 239000010410 layer Substances 0.000 abstract description 67
- 239000011229 interlayer Substances 0.000 abstract description 6
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 238000007747 plating Methods 0.000 description 7
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 238000003475 lamination Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 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
- H01F17/0033—Printed inductances with the coil helically wound around a magnetic core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/04—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing coils
- H01F41/041—Printed circuit coils
- H01F41/046—Printed circuit coils structurally combined with ferromagnetic material
Definitions
- the present invention relates to an inductor element formed by laminating a plurality of ceramic green sheets by forming a conductor pattern, and a method for manufacturing the same.
- Patent Document 1 an inductor element in which a conductor pattern is printed and laminated on a ceramic green sheet made of a magnetic material is known (see, for example, Patent Document 1).
- Patent Document 1 it is necessary to perform plating within a very narrow gap on the side surface of the punch hole in the state of the mother laminated body, and it is difficult to plate (for example, electrodes are connected to each other). There are challenges.
- an open magnetic circuit is required because it becomes a closed magnetic circuit (for example, an inductor element is used as an antenna coil). In the case of use), there arises a problem that the propagation distance of the electromagnetic wave is shortened.
- an object of the present invention is to provide an inductor element capable of realizing an open magnetic circuit while performing interlayer connection by via holes, and a manufacturing method thereof.
- a first ceramic green sheet made of a material having a relatively high thermal expansion coefficient is sandwiched between a plurality of second ceramic green sheets made of a material having a relatively low thermal expansion coefficient.
- a ceramic laminate, a first conductor pattern formed on one second ceramic green sheet sandwiching the first ceramic green sheet, and a second conductor sandwiching the first ceramic green sheet A second conductor pattern formed on the second ceramic green sheet, and a via hole for electrical connection between the first conductor pattern and the second conductor pattern.
- the inductor element of the present invention is characterized in that a crack exists in the first ceramic green sheet between the via hole and the end of the ceramic laminate.
- Such a crack is caused by a stress generated by a difference in thermal expansion coefficients of the first ceramic green sheet, the second ceramic green sheet, and the via-hole conductor in the process of integrally firing the ceramic laminate and the coil conductor. That is, a material having a high coefficient of thermal expansion is sandwiched between materials having a low coefficient of thermal expansion, thereby generating a crack due to a compressive stress due to a shrinkage difference during firing and cooling. Since the via hole conductor has the highest thermal expansion coefficient and is most likely to crack around the via hole, if the via hole conductor is formed at a position close to the end face, the crack is connected to the end face. Then, when the first ceramic green sheet contains a magnetic material, the end face side of the magnetic material can be magnetically invalidated by this crack, and a substantially open magnetic path can be obtained. Therefore, an open magnetic circuit can be realized while performing interlayer connection by via holes.
- the difference between the thermal expansion coefficient of the first ceramic green sheet and the thermal expansion coefficient of the second ceramic green sheet (made of a non-magnetic material) is within a predetermined range (for example, 1 to 2 ppm / ° C.).
- a predetermined range for example, 1 to 2 ppm / ° C.
- the via-hole conductor has an extremely high thermal expansion coefficient such as silver (for example, the difference from the thermal expansion coefficient of the second ceramic green sheet is 10 ppm / ° C. or more), cracks occur only around the via hole. It can be an open magnetic path.
- the inductor element can be impregnated with resin to prevent a decrease in strength due to cracks.
- an open magnetic circuit can be realized while performing interlayer connection by via holes.
- FIG. 3 is an exploded perspective view schematically showing an inductor element. It is sectional drawing which represented the inductor element typically. 3 is a top view of a magnetic ferrite layer 13. FIG. It is sectional drawing which represented typically the inductor element which concerns on another example.
- FIG. 1 is an exploded perspective view schematically showing an inductor element according to an embodiment of the present invention.
- FIG. 2 is a cross-sectional view schematically showing the inductor element.
- the inductor element has a ceramic laminated body in which magnetic and non-magnetic ceramic green sheets are laminated.
- FIG. 1 shows the state of each ceramic green sheet before firing
- FIG. 2 shows the state of the ceramic laminate after lamination and firing.
- the upper side of the paper is the upper surface side of the multilayer inductor element
- the lower side of the paper is the lower surface side of the multilayer inductor element.
- the multilayer inductor element includes a nonmagnetic ferrite layer 11, a nonmagnetic ferrite layer 12, a magnetic ferrite layer 13, a nonmagnetic ferrite layer 14, and a nonmagnetic material in order from the upper surface side to the lower surface side of the outermost layer.
- a body ferrite layer 15 is disposed.
- the ceramic laminate includes a magnetic ferrite layer 13 (first ceramic green sheet in the present invention), a nonmagnetic ferrite layer 12 (one second ceramic green sheet in the present invention), and a nonmagnetic ferrite layer 14. (The other second ceramic green sheet in the present invention).
- a conductor pattern 31 (first conductor pattern in the present invention) made of a conductive paste is formed on a magnetic ferrite layer 13.
- a conductor pattern 32 (second conductor pattern in the present invention) made of a conductive paste is formed on the nonmagnetic ferrite layer 14.
- the conductor pattern 31 and the conductor pattern 32 are electrically connected in the stacking direction by the via hole 21.
- the via hole 21 is formed by opening a punch hole at a predetermined position for each ceramic green sheet and plating the surface after lamination.
- the wiring is formed in a spiral shape with the magnetic ferrite layer 13 interposed therebetween to form a coil conductor.
- the end portion of the coil conductor is exposed to the lowermost surface by a via hole 21 provided in the nonmagnetic ferrite layer 15.
- the inductor element functions as a coil antenna by mounting the end portion of the coil conductor exposed on the lowermost surface on the mounting substrate and supplying power to the coil conductor.
- the via hole 21 is formed at a position not exposed to the end face of the ceramic green sheet and as close to the end face as possible. However, the position is set such that it is not exposed to the end face even if process variations are taken into consideration.
- the conductor pattern 31 is formed on the upper surface of the magnetic ferrite layer 13, but may be formed on the lower surface of the nonmagnetic ferrite layer 12.
- the conductor pattern 32 may be formed not on the top surface of the nonmagnetic ferrite layer 14 but on the top surface of the magnetic ferrite layer 13.
- a conductor pattern is formed on the upper surface of the nonmagnetic ferrite layer 12 and the lower surface of the nonmagnetic ferrite layer 14 and connected by via holes to form a parallel line, so that a direct current of the coil conductor is obtained.
- the resistance component may be lowered.
- the non-magnetic ferrite layer 11, the non-magnetic ferrite layer 12, the non-magnetic ferrite layer 14, and the non-magnetic ferrite layer 15 in this embodiment have a lower thermal contraction rate than the magnetic ferrite layer 13. ing. Therefore, by sandwiching the magnetic ferrite layer 13 having a relatively high heat shrinkage rate between the nonmagnetic ferrite layer 12 and the nonmagnetic ferrite layer 14 having a relatively low heat shrinkage rate, the entire element is obtained by firing. The strength can be improved by compression.
- the inductor element according to the present embodiment includes the thermal expansion coefficients of the nonmagnetic ferrite layer 11, the nonmagnetic ferrite layer 12, the nonmagnetic ferrite layer 14, and the nonmagnetic ferrite layer 15, and the magnetic ferrite layer 13.
- the difference from the thermal expansion coefficient is within a predetermined range (for example, 1 to 2 ppm / ° C.), and the conductor (silver) of the via hole 21 has an extremely high thermal expansion coefficient (for example, 10 ppm / ° C. or more than the magnetic ferrite layer 13).
- this crack is caused by sandwiching the magnetic ferrite layer 13 which is a material having a high thermal expansion coefficient between the nonmagnetic ferrite layer 12 and the nonmagnetic ferrite layer 14 which are materials having a low thermal expansion coefficient. It is generated by the compressive stress due to the shrinkage difference at the time of firing and cooling.
- FIG. 3 is a top view of the magnetic ferrite layer 13.
- the conductor (silver) of the via hole 21 has the highest thermal expansion coefficient, cracks are most likely to occur around the via hole 21. Therefore, as shown in FIG. 3, if the via hole 21 is formed at a position close to the end face of the magnetic ferrite layer 13, a crack 51 that connects the via hole 21 and the end face of the magnetic ferrite layer 13 is generated.
- the end face side of the magnetic ferrite layer 13 can be made magnetically invalid, and a substantial open magnetic path can be obtained.
- the cooling rate is too slow, silver in the conductor pattern 31, the conductor pattern 32, and the via hole 21 may diffuse and plating may be abnormally deposited, so that a certain cooling rate is ensured (for example, ⁇ 7 ° C./min). And above).
- a ferrite containing iron, nickel, zinc, and copper is used as the magnetic ferrite layer
- a ferrite containing iron, zinc, and copper is used as the nonmagnetic ferrite layer.
- An example in which a silver material is used as the internal wiring including the conductor pattern 32 and the via hole 21 is shown.
- the difference in thermal expansion coefficient between the magnetic ferrite layer, the nonmagnetic ferrite layer, and the internal wiring is that the via hole 21 and the magnetic ferrite layer are different. It is set each time within a range where cracks 51 connecting the 13 end faces are generated.
- the difference in thermal expansion coefficient between the magnetic ferrite layer, the nonmagnetic ferrite layer, and the internal wiring is different from that of the via hole 21 and the magnetic ferrite. It is set each time within a range where a crack 51 connecting the end face of the layer 13 is generated.
- the inductor element can realize an open magnetic circuit while performing interlayer connection by via holes. Since the inductor element is an interlayer connection by via holes, there is no fear that the electrodes are connected at the time of plating, and the productivity is improved. Further, when the inductor element is used as an antenna coil, the propagation distance can be made longer than when the inductor element is a closed magnetic circuit.
- the inductor element is manufactured by the following process.
- an alloy (conductive paste) containing silver or the like is applied on a ceramic green sheet to be a magnetic ferrite layer or a nonmagnetic ferrite layer, and internal wiring such as the conductor pattern 31 and the conductor pattern 32 is formed. It is formed.
- the conductor pattern 31 and the conductor pattern 32 may be formed after a punch hole to be the via hole 21 is formed.
- each ceramic green sheet is laminated. That is, the nonmagnetic ferrite layer 11, the nonmagnetic ferrite layer 12, the magnetic ferrite layer 13, the nonmagnetic ferrite layer 14, and the nonmagnetic ferrite layer 15 are laminated in this order from the upper surface side, and provisional pressure bonding is performed. . Thereby, the mother laminated body before baking is formed.
- the plating process is performed, for example, by immersing the mother laminate in a plating solution and swinging it.
- mother laminate may be impregnated with resin after firing. In this case, strength reduction due to cracks can be prevented.
- the shape of the punch hole of the via hole 21 is not limited to a circular shape, and may be another shape such as a rectangle or a semicircle.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
13…磁性体フェライト層
21…ビアホール
31,32…導体パターン
51…クラック
Claims (6)
- 熱膨張係数が相対的に高い材料からなる第1のセラミックグリーンシートが、熱膨張係数が相対的に低い材料からなる複数の第2のセラミックグリーンシートによって挟持されてなるセラミック積層体と、
前記第1のセラミックグリーンシートを挟持する一方の第2のセラミックグリーンシートと、前記第1のセラミックグリーンシートと、の間に形成された第1の導体パターンと、
前記第1のセラミックグリーンシートを挟持する他方の第2のセラミックグリーンシートと、前記第1のセラミックグリーンシートと、の間に形成された第2の導体パターンと、
前記第1の導体パターンと前記第2の導体パターンとの電気的接続を行うビアホールと、
を備えたインダクタ素子であって、
前記ビアホールと前記セラミック積層体の端部との間の、前記第1のセラミックグリーンシートに、クラックが存在することを特徴とするインダクタ素子。 - 前記第1のセラミックグリーンシートが磁性体を含むことを特徴とする請求項1に記載のインダクタ素子。
- 前記第2のセラミックグリーンシートが非磁性体からなることを特徴とする請求項1または請求項2に記載のインダクタ素子。
- 前記第1の導体パターン、前記第2の導体パターン、および前記ビアホールは、銀を主成分とする導電性ペーストからなることを特徴とする請求項1ないし請求項3のいずれかに記載のインダクタ素子。
- 前記インダクタ素子は、樹脂が含浸されていることを特徴とする請求項1ないし請求項4のいずれかに記載のインダクタ素子。
- 請求項1ないし請求項5のいずれかに記載のインダクタ素子の製造方法であって、
前記セラミック積層体を焼成する工程において、前記第1のセラミックグリーンシート、前記第2のセラミックグリーンシート、および前記ビアホールの熱膨張係数の差によって、前記クラックを生じさせることを特徴とするインダクタ素子の製造方法。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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CN201290000793.1U CN203760245U (zh) | 2011-09-14 | 2012-05-21 | 电感元件 |
JP2013533541A JP5720791B2 (ja) | 2011-09-14 | 2012-05-21 | インダクタ素子およびその製造方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2011200524 | 2011-09-14 | ||
JP2011-200524 | 2011-09-14 |
Publications (1)
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WO2013038752A1 true WO2013038752A1 (ja) | 2013-03-21 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2012/062901 WO2013038752A1 (ja) | 2011-09-14 | 2012-05-21 | インダクタ素子およびその製造方法 |
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JP (1) | JP5720791B2 (ja) |
CN (1) | CN203760245U (ja) |
WO (1) | WO2013038752A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014050244A1 (ja) * | 2012-09-25 | 2014-04-03 | 株式会社 村田製作所 | インダクタ素子 |
JP5585740B1 (ja) * | 2013-03-18 | 2014-09-10 | 株式会社村田製作所 | 積層型インダクタ素子および通信装置 |
USD755163S1 (en) | 2014-03-13 | 2016-05-03 | Murata Manufacturing Co., Ltd. | Antenna |
WO2016076121A1 (ja) * | 2014-11-12 | 2016-05-19 | 株式会社村田製作所 | 電源モジュールおよびその実装構造 |
Citations (8)
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JPS63174413U (ja) * | 1988-05-12 | 1988-11-11 | ||
JPH04302104A (ja) * | 1991-03-28 | 1992-10-26 | Taiyo Yuden Co Ltd | 積層チップインダクタ |
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JP2005183890A (ja) * | 2003-12-24 | 2005-07-07 | Taiyo Yuden Co Ltd | 積層基板、複数種類の積層基板の設計方法、及び同時焼結積層基板 |
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JP2006310475A (ja) * | 2005-04-27 | 2006-11-09 | Murata Mfg Co Ltd | 積層コイル |
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WO2007145189A1 (ja) * | 2006-06-14 | 2007-12-21 | Murata Manufacturing Co., Ltd. | 積層型セラミック電子部品 |
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2012
- 2012-05-21 WO PCT/JP2012/062901 patent/WO2013038752A1/ja active Application Filing
- 2012-05-21 JP JP2013533541A patent/JP5720791B2/ja active Active
- 2012-05-21 CN CN201290000793.1U patent/CN203760245U/zh not_active Expired - Lifetime
Patent Citations (8)
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JPS63174413U (ja) * | 1988-05-12 | 1988-11-11 | ||
JPH04302104A (ja) * | 1991-03-28 | 1992-10-26 | Taiyo Yuden Co Ltd | 積層チップインダクタ |
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Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014050244A1 (ja) * | 2012-09-25 | 2014-04-03 | 株式会社 村田製作所 | インダクタ素子 |
JP5674077B2 (ja) * | 2012-09-25 | 2015-02-25 | 株式会社村田製作所 | インダクタ素子 |
US9478349B2 (en) | 2012-09-25 | 2016-10-25 | Murata Manufacturing Co., Ltd. | Inductor element |
JP5585740B1 (ja) * | 2013-03-18 | 2014-09-10 | 株式会社村田製作所 | 積層型インダクタ素子および通信装置 |
JP2014207432A (ja) * | 2013-03-18 | 2014-10-30 | 株式会社村田製作所 | 積層型インダクタ素子および通信装置 |
US9287625B2 (en) | 2013-03-18 | 2016-03-15 | Murata Manufacturing Co., Ltd. | Stack-type inductor element and method of manufacturing the same, and communication device |
USD755163S1 (en) | 2014-03-13 | 2016-05-03 | Murata Manufacturing Co., Ltd. | Antenna |
WO2016076121A1 (ja) * | 2014-11-12 | 2016-05-19 | 株式会社村田製作所 | 電源モジュールおよびその実装構造 |
JPWO2016076121A1 (ja) * | 2014-11-12 | 2017-06-22 | 株式会社村田製作所 | 電源モジュールおよびその実装構造 |
US10158293B2 (en) | 2014-11-12 | 2018-12-18 | Murata Manufacturing Co., Ltd. | Power supply module and mounting structure therefor |
Also Published As
Publication number | Publication date |
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CN203760245U (zh) | 2014-08-06 |
JPWO2013038752A1 (ja) | 2015-03-23 |
JP5720791B2 (ja) | 2015-05-20 |
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