JP4846025B2 - 磁性体の製造方法 - Google Patents
磁性体の製造方法 Download PDFInfo
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- JP4846025B2 JP4846025B2 JP2009520655A JP2009520655A JP4846025B2 JP 4846025 B2 JP4846025 B2 JP 4846025B2 JP 2009520655 A JP2009520655 A JP 2009520655A JP 2009520655 A JP2009520655 A JP 2009520655A JP 4846025 B2 JP4846025 B2 JP 4846025B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 66
- 238000000034 method Methods 0.000 title claims description 39
- 239000000696 magnetic material Substances 0.000 title claims description 18
- 239000006247 magnetic powder Substances 0.000 claims description 57
- 239000000463 material Substances 0.000 claims description 33
- 239000000758 substrate Substances 0.000 claims description 28
- 238000000465 moulding Methods 0.000 claims description 25
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 24
- 239000011889 copper foil Substances 0.000 claims description 21
- 238000003825 pressing Methods 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 230000003746 surface roughness Effects 0.000 claims description 7
- 239000011888 foil Substances 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 5
- 238000005530 etching Methods 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 238000007719 peel strength test Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 229920002120 photoresistant polymer Polymers 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000000377 silicon dioxide Substances 0.000 description 3
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000000059 patterning Methods 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000007822 coupling agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000000206 photolithography Methods 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Classifications
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- 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
-
- 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
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
-
- 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
- H01F27/24—Magnetic cores
- H01F27/255—Magnetic cores made from particles
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
- H05K1/165—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed inductors
-
- 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
- H01F2017/048—Fixed inductances of the signal type with magnetic core with encapsulating core, e.g. made of resin and magnetic powder
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
- H05K1/0373—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement containing additives, e.g. fillers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
- H05K2201/0203—Fillers and particles
- H05K2201/0206—Materials
- H05K2201/0215—Metallic fillers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/08—Magnetic details
- H05K2201/083—Magnetic materials
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/09—Shape and layout
- H05K2201/09009—Substrate related
- H05K2201/09118—Moulded substrate
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10265—Metallic coils or springs, e.g. as part of a connection element
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10227—Other objects, e.g. metallic pieces
- H05K2201/10287—Metal wires as connectors or conductors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/103—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by bonding or embedding conductive wires or strips
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/20—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by affixing prefabricated conductor pattern
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Coils Or Transformers For Communication (AREA)
- Soft Magnetic Materials (AREA)
- Manufacturing Of Printed Wiring (AREA)
Description
以下、本発明の磁性体の製造方法について、図に示す実施形態に基づいて詳細に説明する。なお、以下の説明では、実施形態に用いる図面について同一の構成要素には同一の符号を付し、かつ重複する説明は可能な限り省略する。
図1は、実施形態に係る磁性体の製造方法によって製造される磁性体10を説明するために示す図である。
磁性体10は、図1に示すように、絶縁磁性粉末MPを押圧成形した磁性部12と、磁性部12の表面に形成され所望パターンを有する配線13と、磁性部12の裏面に設けられた電極14と、電極14及び配線13を電気的に接続する接続子16とを備える表面実装型のインダクタである。
図2は、実施形態に係る磁性体の製造方法を説明するために示すフローチャートである。
第1工程S10は、シート状の基材1と、基材1上に形成され基材1から離脱可能な配線13とを有する配線基材4を準備する工程である。
第2工程S20は、成形空間中に絶縁磁性粉末MPを堆積した後、絶縁磁性粉末MPの表面に、配線13が対向するように配線基材4を配置し、これらを押圧成形する工程である。
第3工程S30は、固化した絶縁磁性粉末MPの表面から配線13を残して基材1を取除く工程である。
第4工程S40は、磁性部12に接続子16を取り付けるとともに、ICチップ17、コンデンサ、抵抗などの電子部品を搭載する工程である。
次に、配線の平均表面粗さと、配線の密着度との関係を明らかにするために、配線の引き剥し強度試験(ピール強度試験)を行った。
実施形態に係る磁性体の製造方法における第1工程10〜第3工程S30までと同様の方法を用いて磁性体を形成した。磁性体の寸法は、縦10mm×横10mm×高さ2mmである。また、配線の幅は3mmであり、配線の厚さは75μmである。絶縁磁性粉末MPとしては、表面がシリカ膜に被覆された鉄粒子からなる絶縁磁性粉末を用いた。絶縁磁性粉末MPの平均粒径は5μmである。
配線として平均表面粗さRaが6μmの銅箔を基材上に形成した配線基材(図8(a)参照。)を用いて磁性体を作製し、試料Aとした。
配線として平均表面粗さRaが2μmの銅箔を基材上に形成した配線基材(図8(b)参照。)を用いて磁性体を作製し、試料Bとした。
引き剥し強度試験においては、1分に1mmの引き剥し速度で、配線を上方に引っ張りながら配線を磁性部から引き剥していくのに必要な引っ張り力を測定する。
Claims (7)
- 成形空間中に絶縁磁性粉末を堆積して押圧成形し、該押圧成形によって固化される表面に配線を形成する磁性体の製造方法であって、
シート状の基材と、当該基材上に形成され当該基材から離脱可能な配線とを有する配線基材を準備する第1工程と、
前記成形空間中に前記絶縁磁性粉末を堆積した後、前記絶縁磁性粉末の表面に、前記配線が対向するように当該配線基材を配置し、これらを押圧成形する第2工程と、
固化した前記絶縁磁性粉末の表面から前記配線を残して前記基材を取除く第3工程とをこの順序で含むことを特徴とする磁性体の製造方法。 - 請求項1記載の磁性体の製造方法において、
前記配線基材は、前記基材上に導電膜を形成した後、前記導電膜に対して所望パターンのエッチングを施して前記配線を形成することにより形成された配線基材であることを特徴とする磁性体の製造方法。 - 請求項1又は2に記載の磁性体の製造方法において、
前記配線の平均表面粗さは、前記絶縁磁性粉末の平均粒径よりも大きいことを特徴とする磁性体の製造方法。 - 請求項1〜3のいずれかに記載の磁性体の製造方法において、
前記配線は、金属箔からなることを特徴とする磁性体の製造方法。 - 請求項4に記載の磁性体の製造方法において、
前記金属箔は、銅箔であることを特徴とする磁性体の製造方法。 - 請求項1〜5のいずれかに記載の磁性体の製造方法において、
前記基材は、樹脂からなることを特徴とする磁性体の製造方法。 - 請求項1〜6のいずれかに記載の磁性体の製造方法において、
前記第2工程は、
前記成形空間中に前記絶縁磁性粉末を堆積した状態で予備プレス成形をして前記絶縁磁性粉末の表面を平坦化する予備プレス工程と、
前記絶縁磁性粉末の表面に、前記配線が対向するように前記配線基材を配置した状態で、前記予備プレス成形よりも高いプレス圧力で押圧成形する本プレス工程とをこの順序で含むことを特徴とする磁性体の製造方法。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009520655A JP4846025B2 (ja) | 2007-06-27 | 2008-06-27 | 磁性体の製造方法 |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2007168815 | 2007-06-27 | ||
JP2007168815 | 2007-06-27 | ||
JP2009520655A JP4846025B2 (ja) | 2007-06-27 | 2008-06-27 | 磁性体の製造方法 |
PCT/JP2008/061777 WO2009001944A1 (ja) | 2007-06-27 | 2008-06-27 | 磁性体の製造方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPWO2009001944A1 JPWO2009001944A1 (ja) | 2010-08-26 |
JP4846025B2 true JP4846025B2 (ja) | 2011-12-28 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2009520655A Expired - Fee Related JP4846025B2 (ja) | 2007-06-27 | 2008-06-27 | 磁性体の製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100158743A1 (ja) |
JP (1) | JP4846025B2 (ja) |
KR (1) | KR101096942B1 (ja) |
CN (1) | CN101681720B (ja) |
WO (1) | WO2009001944A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7229056B2 (ja) * | 2019-03-22 | 2023-02-27 | Tdk株式会社 | 積層コイル部品 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0536513A (ja) * | 1991-07-30 | 1993-02-12 | Tokin Corp | 軟磁性金属合金粉末及びそれを用いた圧粉磁芯 |
JP2001176728A (ja) * | 1999-12-17 | 2001-06-29 | Matsushita Electric Ind Co Ltd | Lc複合部品および電源素子 |
JP2001267160A (ja) * | 2000-01-12 | 2001-09-28 | Tdk Corp | コイル封入圧粉コアの製造方法およびコイル封入圧粉コア |
JP2002305366A (ja) * | 2001-02-05 | 2002-10-18 | Tdk Corp | 積層基板および電子部品の製造方法、 |
JP2002324729A (ja) * | 2001-02-22 | 2002-11-08 | Tdk Corp | 電子部品とその製造方法 |
JP2003234214A (ja) * | 2002-02-08 | 2003-08-22 | Toko Inc | 電子回路モジュール |
JP2004039676A (ja) * | 2002-06-28 | 2004-02-05 | Mitsui Chemicals Inc | インダクター内蔵型プリント配線基板の製造方法 |
JP2006222458A (ja) * | 2006-05-08 | 2006-08-24 | Matsushita Electric Works Ltd | プリント配線板の製造方法及びプリント配線板 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3399366B2 (ja) * | 1998-06-05 | 2003-04-21 | 株式会社村田製作所 | インダクタの製造方法 |
EP1347475A4 (en) * | 2000-12-28 | 2009-07-15 | Tdk Corp | LAMINATED PCB AND METHOD FOR PRODUCING AN ELECTRONIC PART AND LAMINATED ELECTRONIC PART |
-
2008
- 2008-06-27 JP JP2009520655A patent/JP4846025B2/ja not_active Expired - Fee Related
- 2008-06-27 WO PCT/JP2008/061777 patent/WO2009001944A1/ja active Application Filing
- 2008-06-27 US US12/665,659 patent/US20100158743A1/en not_active Abandoned
- 2008-06-27 CN CN2008800209081A patent/CN101681720B/zh not_active Expired - Fee Related
- 2008-06-27 KR KR1020097026855A patent/KR101096942B1/ko not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0536513A (ja) * | 1991-07-30 | 1993-02-12 | Tokin Corp | 軟磁性金属合金粉末及びそれを用いた圧粉磁芯 |
JP2001176728A (ja) * | 1999-12-17 | 2001-06-29 | Matsushita Electric Ind Co Ltd | Lc複合部品および電源素子 |
JP2001267160A (ja) * | 2000-01-12 | 2001-09-28 | Tdk Corp | コイル封入圧粉コアの製造方法およびコイル封入圧粉コア |
JP2002305366A (ja) * | 2001-02-05 | 2002-10-18 | Tdk Corp | 積層基板および電子部品の製造方法、 |
JP2002324729A (ja) * | 2001-02-22 | 2002-11-08 | Tdk Corp | 電子部品とその製造方法 |
JP2003234214A (ja) * | 2002-02-08 | 2003-08-22 | Toko Inc | 電子回路モジュール |
JP2004039676A (ja) * | 2002-06-28 | 2004-02-05 | Mitsui Chemicals Inc | インダクター内蔵型プリント配線基板の製造方法 |
JP2006222458A (ja) * | 2006-05-08 | 2006-08-24 | Matsushita Electric Works Ltd | プリント配線板の製造方法及びプリント配線板 |
Also Published As
Publication number | Publication date |
---|---|
US20100158743A1 (en) | 2010-06-24 |
KR20100018583A (ko) | 2010-02-17 |
CN101681720B (zh) | 2012-01-18 |
JPWO2009001944A1 (ja) | 2010-08-26 |
WO2009001944A1 (ja) | 2008-12-31 |
KR101096942B1 (ko) | 2011-12-20 |
CN101681720A (zh) | 2010-03-24 |
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