WO2007074580A1 - Partie bobine lamellée - Google Patents

Partie bobine lamellée Download PDF

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Publication number
WO2007074580A1
WO2007074580A1 PCT/JP2006/321884 JP2006321884W WO2007074580A1 WO 2007074580 A1 WO2007074580 A1 WO 2007074580A1 JP 2006321884 W JP2006321884 W JP 2006321884W WO 2007074580 A1 WO2007074580 A1 WO 2007074580A1
Authority
WO
WIPO (PCT)
Prior art keywords
ferrite
coil
laminated
laminate
coil component
Prior art date
Application number
PCT/JP2006/321884
Other languages
English (en)
Japanese (ja)
Inventor
Tomohide Iwasaki
Original Assignee
Murata Manufacturing Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Murata Manufacturing Co., Ltd. filed Critical Murata Manufacturing Co., Ltd.
Priority to CN200680002400XA priority Critical patent/CN101103420B/zh
Priority to JP2007530525A priority patent/JP4530044B2/ja
Publication of WO2007074580A1 publication Critical patent/WO2007074580A1/fr

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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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/265—Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/34—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials non-metallic substances, e.g. ferrites
    • H01F1/342—Oxides
    • H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
    • 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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/327—Iron group oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3279—Nickel oxides, nickalates, or oxide-forming salts thereof
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3281—Copper oxides, cuprates or oxide-forming salts thereof, e.g. CuO or Cu2O
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3284—Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof

Definitions

  • the present invention relates to a multilayer coil component, and more particularly to a multilayer coil component such as a chip inductor in which a coil is incorporated in a multilayer body made of ferrite.
  • laminated coil components such as chip inductors are formed by laminating a sheet of ferrite and a coil conductor, and connecting the ends of the coil conductor via via-hole conductors to form a spiral coil. Is provided.
  • this type of multilayer coil component is used as a noise countermeasure, a large impedance I z I is desired as a high performance.
  • the characteristics changed due to the ferrite shrinkage during firing, and it was difficult to obtain a desirable impedance I z I.
  • Patent Document 1 discloses a multilayer inductor in which a bonded body layer is surface bonded to the upper and lower surfaces of a ferrite magnetic layer, and the linear expansion coefficient of the bonded body layer is smaller than that of the ferrite magnetic layer.
  • the bonded body layer can suppress the expansion and contraction of the ferrite magnetic layer, and the temperature dependence of the inductance value can be suppressed.
  • the stress caused by the shrinkage difference between the coil conductor and the ferrite during firing of the multilayer body cannot be relaxed, and the reduction of the impedance I z I cannot be prevented.
  • Patent Document 1 Japanese Patent Laid-Open No. 4-302104
  • an object of the present invention is to provide a laminated coil component that can relieve internal stress caused by a shrinkage difference between a coil conductor and ferrite during firing of the laminated body and prevent a reduction in impedance. .
  • a laminated coil component includes a laminated body main portion made of a first ferrite having a coil disposed therein, and both of the laminated body main portion in the coil axial direction.
  • the second ferrite disposed outside the multilayer body during firing of the multilayer body is more than the first ferrite disposed inside including the coil. It contracts greatly, has a small shrinkage rate, is inhibited by the coil conductor, promotes the contraction of the first ferrite, and relaxes the tensile stress generated in the first ferrite. As a result, the tensile stress generated in the first ferrite around the coil conductor is relaxed and the impedance is prevented from lowering.
  • the laminated coil component according to the present invention if Ni—Cu—Zn ferrite or Ni—Zn ferrite is used as the first ferrite and the second ferrite, good characteristics can be obtained. .
  • the Zn content of the second ferrite is set higher than the Zn content of the first ferrite, the shrinkage rate during firing of the second ferrite increases, and the stress generated in the first ferrite Increases the relaxation effect.
  • the second ferrite only needs to contain 25 to 70 mol% of Zn.
  • the coil is preferably formed in a spiral shape by connecting a coil conductor made of Ag metal via a via-hole conductor.
  • Ag makes it possible to obtain laminated coil parts with low electrical resistance and good characteristics (Q value).
  • the shrinkage rate during firing of the second ferrite disposed outside the laminate is greater than the shrinkage rate during firing of the first ferrite disposed inside including the coil. Therefore, when the laminate is fired, the second ferrite promotes the shrinkage of the first ferrite, and the tensile stress generated in the first ferrite is relieved and the impedance is prevented from being lowered.
  • FIG. 1 is a schematic perspective view showing a first embodiment of the laminated coil component according to the present invention.
  • FIG. 2 is a sectional view of the first embodiment.
  • FIG. 3 is an exploded perspective view of the first embodiment.
  • FIG. 4 is a schematic diagram showing an outline of a stress distribution. (A) shows a conventional example, and (B) shows a first example.
  • FIG. 5 Schematic diagram of the results of simulating the stress distribution, (A) shows the conventional example and (B) shows the first example.
  • FIG. 6 is a graph showing impedance characteristics.
  • FIG. 7 is a schematic perspective view showing a second embodiment of the laminated coil component according to the present invention.
  • FIG. 8 is an exploded perspective view of a second embodiment.
  • FIGS. 1 to 6 Refer to the first embodiment, FIGS. 1 to 6)
  • a laminated coil component 1A As shown in FIG. 1, a laminated coil component 1A according to the first embodiment of the present invention includes a laminated main body 21 made of a first ferrite having a coil 10 disposed therein, and both ends in a coil axial direction A. And a laminated body end portion 22 made of a second ferrite formed on the upper portion (upper and lower portions), and external electrodes 23 are provided on the left and right end portions of the laminated body 20.
  • Figure 2 shows the cross section.
  • FIG. 3 is a schematic exploded view, and the number of sheets is not accurately shown.
  • the first ferrite forming the main portion 21 and the second ferrite forming the end portion 22 have different ferrite compositions, and the second ferrite has the first ferrite having a shrinkage ratio during firing. Those having a composition larger than the shrinkage ratio during firing are used. The ferrite composition and shrinkage will be described later.
  • a manufacturing method of the laminated coil component will be described.
  • a desired pattern is formed by a printing method such as screen printing with a conductive paste on a ferrite green sheet in which through holes are formed, and the sheet is formed into a spiral coil.
  • a laminated coil component is obtained by laminating, crimping, cutting, and firing so that a magnetic layer is formed.
  • a ferrite coil and a conductor material are alternately printed by a printing method such as screen printing to form a spiral coil, and a laminated coil component is obtained by crimping, cutting and firing.
  • the laminated coil component 1A was manufactured through the following steps. First, prepare ferrite sheets 25-27. Ni-Cu-Zn-based ferrites, Ni-Zn-based ferrites, Cu-Zn-based ferrites, etc. can be used in addition to the first and second ferrites that are preferred for materials with high magnetic permeability.
  • the second ferrite uses a material with a higher thermal shrinkage than the first ferrite.
  • the heat shrinkage rate is adjusted by changing the content of elements such as Ni, Zn, and Cu contained in the flight. For example, it can be adjusted by changing the Zn content.
  • Holes for via hole conductors are formed in the prepared ferrite sheets 25 and 26, and the internal conductors (the coil conductor 11 and the lead electrode 12) are printed.
  • the internal conductor should have a low resistance value to achieve a high Q (quality factor) as an inductance element.
  • precious metals mainly composed of Ag, Au, Pt and the like and the power of these alloys, base metals such as Cu and Ni, and alloys thereof can be used. Ag was used in the production of the first example.
  • the sheets 25 to 27 shown in FIG. 3 are laminated and pressure-bonded to produce a laminate 20 including the coil 10 therein.
  • the above steps are performed in a state where a plurality of units of coils 10 are arranged in a matrix as a mother substrate, and this mother laminate is cut into one unit laminate (chip) 20.
  • the obtained laminate 20 is degreased and fired.
  • external electrodes 23 are formed on the left and right ends of the laminate 20.
  • the external electrode 23 is formed from the left and right end surfaces of the laminate 20 to the upper and lower surfaces and the side surfaces, and is connected to the extraction electrode 12 at the end surfaces.
  • the external electrode 23 contains Ag or the like as a main component, and an adhesive layer is formed on the surface.
  • the manufactured laminated coil component 1A has a long side of 1. Omm, a short side of 0.5mm, and a height of 0.5mm.
  • the second ferrite of the outer layer 22 is FeO force S50 mol%, ZnO 15 mol%, NiO
  • the first ferrite of the inner layer 21 is Fe 2 O
  • Fig. 4 (A) schematically shows the stress distribution generated during firing in a conventional multilayer coil component
  • Fig. 4 (B) schematically shows the stress distribution generated during firing in the multilayer coil component 1A of the first embodiment.
  • Fig. 4 (A) in conventional laminated coil components, coil Due to the difference in shrinkage between the body and the flight, a large tensile stress is generated on the flight as shown by the arrow. The strongest magnetic field is generated in the ferrite inside the coil conductor. In this strong magnetic field ferrite, tensile stress is generated in a direction parallel to the magnetic field. When the stress of ferrite acted, the electrical properties of the material deteriorated, resulting in a decrease in impedance I z I.
  • the thermal contraction rate of the second ferrite at the end 22 is the heat of the first ferrite at the main portion 21. Since the contraction rate is larger, the end 22 contracts greatly in the direction orthogonal to the coil axis direction A of the coil 10. Since the main portion 21 has a small thermal contraction rate and the coil conductor 11 exists, the main portion 21 cannot sufficiently contract and a tensile stress is generated in the first ferrite. This tensile stress is offset by the large compression of the end 22. As a result, the tensile stress around the coil conductor 11 that is a strong magnetic field portion is relieved, and the impedance I Z I is prevented from decreasing.
  • FIG. 5 (A) is a schematic diagram of the simulated stress distribution in the conventional multilayer coil component shown in Fig. 4 (A), and Fig. 5 (B) is a schematic diagram of Fig. 4 (B).
  • FIG. 3 is a schematic diagram of a simulated stress distribution in the laminated coil component 1 A of one embodiment. 4 and 5, the outward arrow indicates tensile stress, and the inward arrow indicates compressive stress.
  • the linear expansion coefficient of the ferrite was 2. Since shrinkage during firing at 880 ° C is 23% 614 X 10- 4 (0. 23/880) .
  • the linear expansion coefficient of the coil conductor was set to 5.68 2 X 10 5 because the shrinkage ratio upon firing at 880 ° C was 5%.
  • Fig. 6 is a graph showing the impedance IZI characteristics.
  • Curve Y shows the characteristics of the conventional multilayer coil components shown in Figs. 4 (A) and 5 (A), and curve X shows Fig. 4 (B).
  • FIG. 5B shows the characteristics of the laminated coil component 1A of the first embodiment shown in FIG. 5 (B).
  • the impedance I z I is improved overall (particularly, in the band of 10 ⁇ : LlOOMHz) in the laminated coil component 1A of the first embodiment.
  • the integral difference of the conventional example is +10, whereas the samples 1 to 7 of the first embodiment have a small integral difference! /.
  • the revealed laminated coil component 1A is sample 2
  • the integral difference is +1
  • the stress generated in the inner layer 21 is 1.465 NZmm 2 .
  • Stress generated in the inner layer 21 is 0. 3 5.
  • ONZmm 2 is a suitable range.
  • the shrinkage rate of ferrite can be adjusted by the Zn content, and the composition of ferrite having various shrinkage rates is shown in Table 2 below.
  • the coil 50 is arranged in the main part 61 of the laminated body made of the first ferrite so that the coil axial direction A is arranged in parallel to the mounting surface 5.
  • a laminate end portion 62 made of a second ferrite is provided at both end portions in the axial direction A (left and right end portions of the laminate 60).
  • each of the ferrite sheets 65 to 68 is formed of the second ferrite having a large shrinkage at both ends and the other portion is formed of the first ferrite. .
  • the coil conductor 51, the extraction electrode 52 and the via hole conductor 53 are formed on the ferrite sheet 65, the via hole conductor 53 is formed on the ferrite sheet 66, and the coil conductor 51 and the via hole conductor 53 are formed on the ferrite sheet 67.
  • These ferrite sheets 65 to 67 are laminated, and a plain ferrite sheet 68 is laminated on the upper and lower portions thereof to form a spiral coil 50.
  • the external electrodes are provided at both left and right ends of the multilayer body 60.
  • the laminated coil component according to the present invention can be variously modified within the scope of the gist of the present invention, not limited to the above embodiment.
  • the end portion of the laminated body made of the second ferrite having a large shrinkage rate may be provided on one side which is not necessarily provided on both sides of the laminated body.
  • the shape of the coil conductor formed on the ferrite sheet is arbitrary.
  • the present invention can be applied not only to multilayer inductors but also to LC composite parts.
  • the first and second ferrites are composed of the same composition system ferrite, but may be composed of different composition system ferrites. However, if the first and second ferrites are composed of the same composition type of flites, the adhesion between them becomes better.
  • the present invention is useful for laminated coil components, and particularly when the laminated body is fired. It is excellent in that the internal stress caused by the shrinkage difference between the coil conductor and ferrite can be relieved and the impedance can be prevented from decreasing.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

Partie bobine lamellée qui réalise la relaxation de n'importe quelle contrainte interne attribuée au retrait de ferrite se produisant au moment de la cuisson du lamellé, empêchant tout chute d'impédance. L'invention concerne une partie bobine lamellée comportant une partie principale lamellée (21) d'une première ferrite ayant une bobine (10) disposée dans son intérieur et comprenant des parties extrêmes lamellées (22) d'une deuxième ferrite formées aux deux portions extrêmes le long de la direction de l'axe de la bobine (A). La première ferrite constituant la partie principale (21) et la deuxième ferrite constituant les parties extrêmes (22) sont différentes l'une de l'autre de par leur composition, et le taux de retrait à la cuisson de la deuxième ferrite est plus grand que celui à la cuisson de la première ferrite.
PCT/JP2006/321884 2005-12-29 2006-11-01 Partie bobine lamellée WO2007074580A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN200680002400XA CN101103420B (zh) 2005-12-29 2006-11-01 层叠线圈元件
JP2007530525A JP4530044B2 (ja) 2005-12-29 2006-11-01 積層コイル部品

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005380607 2005-12-29
JP2005-380607 2005-12-29

Publications (1)

Publication Number Publication Date
WO2007074580A1 true WO2007074580A1 (fr) 2007-07-05

Family

ID=38217806

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2006/321884 WO2007074580A1 (fr) 2005-12-29 2006-11-01 Partie bobine lamellée

Country Status (5)

Country Link
JP (1) JP4530044B2 (fr)
KR (1) KR100820025B1 (fr)
CN (1) CN101103420B (fr)
TW (1) TW200733153A (fr)
WO (1) WO2007074580A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011009644A (ja) * 2009-06-29 2011-01-13 Tdk Corp フェライトコアおよび電子部品
WO2013038752A1 (fr) * 2011-09-14 2013-03-21 株式会社村田製作所 Élément d'inducteur et procédé pour sa fabrication
EP2722857A4 (fr) * 2011-06-15 2015-07-08 Murata Manufacturing Co Partie de bobine multicouche
US9281113B2 (en) 2011-06-15 2016-03-08 Murata Manufacturing Co., Ltd. Laminated coil component, and method of manufacturing the laminated coil component
GB2516128B (en) * 2012-04-27 2017-04-19 Murata Manufacturing Co Coil antenna and communication terminal device

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101408617B1 (ko) 2012-11-20 2014-06-17 삼성전기주식회사 적층형 코일 부품
KR101408525B1 (ko) 2012-11-20 2014-06-17 삼성전기주식회사 적층형 코일 부품
TW201434068A (zh) * 2013-02-23 2014-09-01 Conquer Electronics Co Ltd 垂直繞線中空保險絲之製法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0696940A (ja) * 1991-05-02 1994-04-08 American Teleph & Telegr Co <Att> 固体複合磁性素子の製造方法
JPH0766030A (ja) * 1993-08-24 1995-03-10 Tokin Corp 積層型磁気素子及びその製造方法
JP2005294725A (ja) * 2004-04-05 2005-10-20 Murata Mfg Co Ltd 積層型セラミック電子部品及び該積層型セラミック電子部品の製造方法
JP2005306696A (ja) * 2004-04-26 2005-11-04 Matsushita Electric Ind Co Ltd 磁性フェライトおよびそれを用いたコモンモードノイズフィルタ並びにチップトランス

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4293936B2 (ja) * 2004-04-21 2009-07-08 Ｔｄｋ株式会社 Ｍｎ−Ｚｎ系フェライト部材

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0696940A (ja) * 1991-05-02 1994-04-08 American Teleph & Telegr Co <Att> 固体複合磁性素子の製造方法
JPH0766030A (ja) * 1993-08-24 1995-03-10 Tokin Corp 積層型磁気素子及びその製造方法
JP2005294725A (ja) * 2004-04-05 2005-10-20 Murata Mfg Co Ltd 積層型セラミック電子部品及び該積層型セラミック電子部品の製造方法
JP2005306696A (ja) * 2004-04-26 2005-11-04 Matsushita Electric Ind Co Ltd 磁性フェライトおよびそれを用いたコモンモードノイズフィルタ並びにチップトランス

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011009644A (ja) * 2009-06-29 2011-01-13 Tdk Corp フェライトコアおよび電子部品
EP2722857A4 (fr) * 2011-06-15 2015-07-08 Murata Manufacturing Co Partie de bobine multicouche
US9281113B2 (en) 2011-06-15 2016-03-08 Murata Manufacturing Co., Ltd. Laminated coil component, and method of manufacturing the laminated coil component
US9490060B2 (en) 2011-06-15 2016-11-08 Murata Manufacturing Co., Ltd. Laminated coil component
US9741484B2 (en) 2011-06-15 2017-08-22 Murata Manufacturing Co., Ltd. Laminated coil component
WO2013038752A1 (fr) * 2011-09-14 2013-03-21 株式会社村田製作所 Élément d'inducteur et procédé pour sa fabrication
JPWO2013038752A1 (ja) * 2011-09-14 2015-03-23 株式会社村田製作所 インダクタ素子およびその製造方法
GB2516128B (en) * 2012-04-27 2017-04-19 Murata Manufacturing Co Coil antenna and communication terminal device
US10020582B2 (en) 2012-04-27 2018-07-10 Murata Manufacturing Co., Ltd. Coil antenna and communication terminal device

Also Published As

Publication number Publication date
KR20070088748A (ko) 2007-08-29
TWI317528B (fr) 2009-11-21
JPWO2007074580A1 (ja) 2009-06-04
KR100820025B1 (ko) 2008-04-08
CN101103420B (zh) 2011-09-28
JP4530044B2 (ja) 2010-08-25
CN101103420A (zh) 2008-01-09
TW200733153A (en) 2007-09-01

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